WO2008044590A1

WO2008044590A1 - Power transmission device

Info

Publication number: WO2008044590A1
Application number: PCT/JP2007/069456
Authority: WO
Inventors: Atsushi Ozawa; Toshiki Fukasawa; Isamu Shirai; Shogo Kimura; Motoaki Yoshida; Kazuhiko Takai
Original assignee: Sanden Corporation
Priority date: 2006-10-11
Filing date: 2007-10-04
Publication date: 2008-04-17

Abstract

A power transmission device having coaxially arranged drive side and driven side rotating members, a connection member for connecting both rotating members, and fixing members for fixing the rotating members and the connection member together. The power transmission member transmits power from the drive-side rotation member to the driven-side transmission member through the connection member, and, when the transmitted power exceeds a preset value, the power transmission member interrupts the power transmission by disengaging either of the fixing members from the connection member. The fixation member disengaged from the connection member is constructed from a columnar fixing member as a separate body from the rotation members and the connection member. The rotation members and the connection member are fixed together by axially staking the columnar fixing member such that the columnar fixing member is disengageable from the connection member. The durability and reliability of power interruption characteristics of the power transmission device are enhanced while preventing an increase in cost and size and impairment of easiness of assembling.

Description

Specification

Power transmission device

Technical field

The present invention relates to a power transmission device that transmits power from a driving side rotating member to a driven side rotating member so that the power transmission can be cut off when the transmitted power becomes excessive.

Background art

[0002] As a power transmission device having a power cutoff function, for example, there is a power transmission device that transmits a driving force from a driving source to a compressor so that the power transmission can be cut off when the transmission power becomes excessive. It is described in Document 1, Patent Document 2, Patent Document 3, and the like. In the power transmission devices described in these patent documents, for example, as shown in FIG. 20, power from a drive source (for example, an engine) is transmitted to a drive-side rotating member 101 formed of a pulley so that the drive-side rotating member 101 Is rotated in the 102 direction. The driving force of the driving side rotating member 101 is transmitted to the driven side rotating member 104 connected to the driving shaft side of the compressor via a leaf spring 103 as a connecting member. One end of the leaf spring 103 is fixed to the driven side rotating member 104 via a pin or protruding fixing member 105, and the other end of the leaf spring 103 is connected to the driving side rotating member 101 via a pin or protruding fixing member 106. It is fixed. The fixing members 105 and 106 are integrally provided on any one of the rotating members 101 and 104 and the leaf spring 103. Then, at the fixed portion to the driving side rotating member 101, the fixing member 106 is sandwiched from both sides by the tip of the leaf spring 103, and when the transmission power becomes excessive, the fixing member 106 is separated from the leaf spring 103. The power transmission is interrupted by disengaging and causing the driving side rotating member 101 to idle with respect to the driven side rotating member 104.

Patent Document 1: Japanese Patent Application Laid-Open No. 2004-197928

Patent Document 2: JP 2004-197929 A

Patent Document 3: Japanese Patent Laid-Open No. 2005-308203

Disclosure of the invention

Problems to be solved by the invention

[0003] The conventional power transmission device as described above has the following problems. First, because the power is transmitted by pinching the outer periphery of the fixed member 106 only in the radial direction at the tip of the leaf spring 103, the pinching contact portion is fretting wear due to vibration and torque fluctuation due to rotational fluctuation of the drive source. (Surface wear due to minute relative sliding under load) may occur, the pinching force may be reduced, and malfunction (power transmission may be interrupted below a predetermined value) may occur. That is, there is a risk that the durability will be lowered and the reliability of the power transmission cutoff characteristic may be reduced.

[0004] In addition, in order to generate a pinching force that can withstand vibrations, etc., it is necessary to increase the thickness, number of layers, material strength, hardness, etc. of the leaf spring 103, which increases the cost and size of the product. As a result, the assembly becomes worse.

[0005] Further, a portion that sandwiches the fixing member 106 at the front end of the leaf spring 103 extends in the extending direction of the leaf spring 103. The opening of the leaf spring 103 also extends in the extending direction of the leaf spring 103. It is formed to open along. Therefore, when power transmission is interrupted, the leaf spring 103 starts rotating around the center of the fixing member 105, and then the fixing member 106 is detached from the tip of the leaf spring 103. . For this reason, if the pinching force on the fixing member 106 side is increased, fretting wear may occur on the fixing member 106 side, which may cause a malfunction due to damage to the fixing member 106. In addition, the reliability of the power transmission interruption characteristics may be reduced.

[0006] Further, power is transmitted by sandwiching the outer peripheral portion of the fixing member 106 in the radial direction at the distal end portion of the leaf spring 103, and the leaf spring 103 of the fixing member 106 is structured by the sandwiching structure at the distal end portion of the leaf spring 103. Since the release torque is set from the center of the leaf spring, the release torque may vary widely or fluctuate due to setting errors that make it difficult to control the release torque stably and accurately, and fatigue of the leaf spring 103 tip. There is a risk of

[0007] Therefore, the problem of the present invention is to pay attention to the problems in the prior art as described above, and to prevent the cost and size of the product from increasing and the deterioration of the assembling property, and the reliability related to the durability and the power shut-off characteristics. An object of the present invention is to provide a power transmission device with improved performance.

[0008] Further, the object of the present invention is to stably and accurately control the separation torque in the connecting member. An object of the present invention is to provide a power transmission device that can be used.

Means for solving the problem

[0009] In order to solve the above-described problem, a power transmission device according to the present invention extends between a driving side rotating member and a driven side rotating member that are concentrically arranged, and between the driving side rotating member and the driven side rotating member. A connecting member that connects the driving side rotating member and the driven side rotating member; a first fixing member that fixes the driving side rotating member and the connecting member; and a second fixing member that fixes the driven side rotating member and the connecting member. The power is transmitted from the driving side rotating member to the driven side rotating member via the connecting member, and when the transmitted power exceeds the set value, the first fixing member or the second fixing member is detached from the connecting member. In the power transmission device configured to interrupt power transmission, the fixing member that is detached from the coupling member is formed of a columnar fixing member that is separate from the rotating member and the coupling member, and the columnar fixing member is The columnar fixing member is connected By caulking the axial direction of the releasably columnar fixing member from member, consisting of those characterized by fixing the coupling member and the rotating member.

[0010] In the power transmission device according to the present invention, the fixing member that is disengaged at the time of excessive power transmission is composed of a columnar fixing member that is separate from both the rotating member and the connecting member. Only the fixing member can be caulked by plastic deformation independently. When the columnar fixing member is pressed and pressed from both sides with the rotating member and the connecting member in between, the force is fixed in the axial direction and the rotating member and the connecting member are clamped from both sides and the axial direction is fixed. Due to the holding force from the inner diameter side due to the expansion of the columnar fixing member in the radial direction at the time of rotation, it becomes possible to securely fix the rotating member and the connecting member with the optimum fixing force according to the caulking force, In addition, it is possible to reliably perform predetermined separation when excessive power is transmitted. Since this caulking force can be easily controlled to the target force by controlling the axial force of the fixing member, the fixing force via the fixing member of the rotating member and the connecting member can be easily adjusted to the target force. Can be controlled accurately. Further, since the fixing by caulking is basically due to plastic deformation of the columnar fixing member, there is a minute relative sliding between the fixing member and the rotating member and between the fixing member and the connecting member. There is no cause for fretting wear. Therefore, the initially set power cutoff characteristic is maintained as it is, and the durability and the reliability of the power cutoff characteristic are improved. [0011] In addition, because the target durability and power shut-off characteristics are secured by force and crimping, the thickness of the connecting member is increased, a plurality of connecting members are stacked, and a special material is used for the connecting member. There is no need to use them, and the associated increase in cost, increase in size, and deterioration in assemblability are surely prevented. Furthermore, assembling is extremely easy because the desired good durability and power cut-off characteristics can be obtained simply by caulking and controlling the caulking force.

[0012] In the power transmission device according to the present invention, a fitting portion that fits each other is provided between the columnar fixing member and the connecting member, between the connecting member and the rotating member, or both. It can be set as the structure currently provided. As a fitting part, it can comprise in the fitting part of a convex part, a recessed part, or a hole part, or the fitting part of a projection part and a notch part, for example.

[0013] By providing such a fitting portion, the fixing strength between the rotating member and the connecting member fixed by plastic deformation of the columnar fixing member, and further the fixing strength between the fixing member and the connecting member. Is increased, and the fixing until the fixing member is detached from the connecting member is further ensured. Therefore, the occurrence of fretting wear and the like can be prevented more reliably, and the initially set power cut-off characteristics can be maintained with high accuracy, and the durability and the reliability of the power cut-off characteristics can be further improved.

[0014] Further, in the power transmission device according to the present invention, the fixing mechanism by caulking the columnar fixing member has an axial force generating mechanism capable of generating an elastic reaction force in the axial direction after caulking. I can do it. As this axial force generating mechanism, for example, the caulking corresponding portion of the connecting member is deformed in advance into a predetermined shape, and an elastic reaction force is generated in the axial direction by the elastic restoring force of the connecting member itself accompanying caulking of the fixing member. It can consist of a mechanism that Alternatively, the axial force generating mechanism may be a mechanism that generates an elastic reaction force in the axial direction by the elastic restoring force of a washer interposed between the connecting member and the columnar fixing member.

[0015] Since such an axial force generation mechanism generates a predetermined elastic reaction force in the axial direction after the force and caulking, the fixing force via the rotating member and the connecting member fixing member due to caulking is accurately targeted. Since the elastic reaction force is maintained at a predetermined value in the caulking state, the fixing force via the fixing member of the rotating member and the connecting member is stable to the target force. It will be well maintained. [0016] Further, in the power transmission device according to the present invention, the connecting member is provided with a notch that opens in the rotation direction of the rotating member so that the columnar fixing member can be detached from the connecting member. It is preferable. Since the connecting member and the rotating member are fixed with the optimal fixing force as described above by caulking the columnar fixing member, when the fixing member also disengages the connecting member force during excessive power transmission, the connecting member and the rotating member should be removed as smoothly as possible. It is desirable. Therefore, if the connecting member is provided with a notch in the above direction, the fixing member can be smoothly released from the connecting member without causing a catching force or a bristle.

[0017] When the cutout is provided, a hole through which the columnar fixing member is passed is formed in the connecting member, and the width of the cutout is set to be equal to or smaller than the diameter of the hole. The structure can be adopted. In other words, the force that can be easily removed by providing a notch. Since it is desirable to hold the fixing member in the hole portion as securely as possible before the separation, the force S can be adopted. Alternatively, in particular, when the above-described fitting portion is provided, a structure in which the width of the notch is set to be equal to or larger than the diameter of the hole portion can be employed. By setting the width of the notch to be equal to or larger than the diameter of the hole, it is possible to achieve a structure in which the fixing member can be smoothly detached from the connecting member without causing any catching force or bristle. Even if such a structure that can be easily detached is adopted, the fitting portion is provided, so that the above-described caulking force and the fixing force due to the fitting of the fitting portion are secured before the separation, and a desired force can be obtained. Fixing is ensured.

[0018] Further, as the columnar fixing member, a rivet-shaped member having a columnar shaft portion and a head portion having a diameter larger than that of the columnar shaft portion at one end thereof can be used. You should be able to squeeze it. By using such a rivet-like member, assembly and caulking can be easily performed.

[0019] Further, the connecting member can be formed into a relatively thin / flat plate member. As a result, it is possible to achieve downsizing of the entire apparatus while providing desired power transmission and excessive transmission power cutoff functions.

[0020] Further, it is preferable that a plurality of connection members are arranged in the rotation direction of the rotation member (for example, three in the rotation direction). Multiple arrangements enable smoother normal power transmission (except when excessive transmission power is generated). [0021] Further, it is preferable that the connecting member is fixed to the rotating member so as to be rotatable around a fixing member opposite to the fixing member separated from the connecting member. With this configuration, when the transmission power is cut off, the connecting member from which the fixing member is detached from one end can be easily rotated so that it does not get in the way (so that one rotating member can rotate freely). And it becomes possible to evacuate appropriately.

[0022] In particular, when the connecting member is disposed so as to be inclined in the rotational direction of the rotating member with respect to the radial direction of the rotating member, the above rotation is performed more smoothly and also during normal power transmission. It is possible to achieve a smooth force transmission direction, and it is possible to appropriately cope with torque fluctuations.

[0023] In the power transmission device according to the present invention, it is possible to rotate integrally with the rotating member between the driving side rotating member and the connecting member or between the driven side rotating member and the connecting member. It is also possible to employ a structure in which a disk fixed to the disk is provided and the disk and the connecting member are fixed via a fixing member. This disk may be configured as an integral part of a rotating member that is tightly fixed to the corresponding rotating member by bolting or the like. By providing such a disk, for example, the connection between the disk and the connecting member via the fixing member, and in some cases, the rotating member on the opposite side of the rotating member with which the disk is integrated and the fixing member for the connecting member are provided. It is possible to tentatively assemble as a pre-assembled part including the connection via In this manner, when the temporarily assembled assembly disk is assembled to the corresponding rotating member side, a predetermined assembly is completed, and the assemblability is further improved. Also, since caulking can be performed at the assembly stage, the caulking force can be controlled more easily.

[0024] Further, in the power transmission device according to the present invention, after the detachment of the fixing member from the connecting member to the rotating member side, that is, the rotating member or the disc, the other anti-detaching side is provided. It is also possible to adopt a structure in which a pin-like protrusion is provided which is abutted against the connecting member supported by the fixing member and rotates the connecting member around the anti-separation side fixing member. That is, as described above, it is desired that the connecting member from which the fixing member has been detached is quickly retracted so as not to get in the way. This is a structure in which a dedicated pin-shaped protrusion for rotating the connecting member is provided. In addition, this The pin-shaped protrusions do not function except when the fixing member is detached.

[0025] When such a structure is adopted, the pin-shaped protrusion is provided on the outer side of the anti-separation side fixing member in the radial direction of the rotating member with respect to the anti-separation side fixing member. Is preferred. In this way, the connecting member can be smoothly rotated with a smaller force.

In the power transmission device according to the present invention, the fixing member that is caulked in the axial direction is preferably made of an annealed member because the material is easily compressed. By including an annealing process, it is possible to keep the hardness constant.

[0027] The power transmission device according to the present invention is basically a force that can be applied as a power transmission device in any device. In particular, there is a torque fluctuation in the drive source, and it is possible to maintain high-accuracy excessive transmission power cutoff performance. It is effective when required. For example, this is effective when the drive source of the drive-side rotating member is a vehicle prime mover. In that case, it is particularly suitable as a power transmission device used for a compressor.

The invention's effect

[0028] Thus, according to the power transmission device of the present invention, the durability without causing an increase in the cost, size, and deterioration of assembly of the device is improved, and the reliability of the power cutoff characteristic is improved. That's the power S. In addition, setting of the breaking power, easy control, high accuracy, and stable maintenance will be achieved.

[0029] Further, in the case of a structure having an axial force generation mechanism capable of generating an elastic reaction force in the axial direction after caulking by the caulking of the columnar fixing member, the separation torque in the connecting member is stabilized. Therefore, it becomes possible to set and control with high accuracy, and the reliability of the power cut-off characteristics can be further improved.

Brief Description of Drawings

FIG. 1 is a front view of a power transmission device according to a first embodiment of the present invention (A) and a cross-sectional view taken along line BB in FIG. (A).

FIG. 2 is a front view of a power transmission device according to a second embodiment of the present invention (A) and a sectional view taken along line BB in FIG.

3 is an enlarged partial front view showing a structural example of a connecting member front end portion of the apparatus of FIG. 2. 4 is a schematic partial cross-sectional view showing a state of caulking of the fixing member of the apparatus of FIG.

5 is a schematic cross-sectional view of a distal end portion of a connecting member showing a completed state of caulking in FIG.

6 is a schematic partial front view showing a state when the fixing member of the apparatus of FIG. 2 is detached.

FIG. 7 is a front view of a power transmission device according to a modification of FIG.

FIG. 8 is a front view of a power transmission device according to a third embodiment of the present invention (A) and a sectional view taken along line BB in FIG.

FIG. 9 is a front view of a power transmission device according to a fourth embodiment of the present invention (A) and a sectional view taken along line BB in FIG.

10 is an enlarged partial front view showing a structural example of a distal end portion of a connecting member of the apparatus of FIG.

FIG. 11 is a schematic partial cross-sectional view showing an example of the caulking and fitting portion structure of the fixing member of the apparatus of FIG.

12 is a schematic partial cross-sectional view showing another example of the caulking of the fixing member and the fitting portion structure of the apparatus of FIG.

13 is a schematic partial front view showing a state when the fixing member of the apparatus of FIG. 9 is detached.

FIG. 14 is a front view of a power transmission device according to a modification of FIG.

FIG. 15 is a schematic configuration diagram showing various structural examples of the fitting portion.

FIG. 16 is a schematic configuration diagram showing an example of an axial force generation mechanism in a power transmission device according to a fifth embodiment of the present invention.

FIG. 17 is a schematic configuration diagram showing another example of the axial force generation mechanism.

FIG. 18 is a schematic configuration diagram showing an example of a state after the fixing member of the axial force generation mechanism is caulked.

FIG. 19 is a schematic configuration diagram showing an example in which a washer is used as an axial force generation mechanism.

FIG. 20 is a front view of a conventional power transmission device.

Explanation of symbols

1 Drive side rotating member

2 Driven side rotating member

3 Bearing

4 Connecting member First fixing member (columnar fixing member) Second fixing member

Columnar shaft

Head

Caulking part

Hole of connecting member

Cutout

Fitting portion

Convex

Recess

Convex

Hole

Groove

Disc

Fixed Bonoleto

Hole formed in the drive-side rotating member Hole formed in the disk Fitting part

Convex

Hole

Convex

Recess

Convex

Cutout

protrusion

Element

Pin-shaped protrusion 51 Washers constituting the axial force generation mechanism

R direction of rotation

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a power transmission device according to a first embodiment of the present invention, in which (A) is a front view thereof, and (B) is a sectional view taken along line BB in FIG. (A). . In FIG. 1, 1 is a driving side rotating member composed of a pulley to which driving force is transmitted from an engine (not shown) via a belt or the like, and 2 is a driven member connected and fixed to, for example, a driving shaft of a compressor. Side rotating members are shown and are arranged concentrically. The drive side rotating member 1 is supported by a bearing 3 so as to be rotatable with respect to the main body side of the compressor and the like. The driving side rotating member 1 and the driven side rotating member 2 are connected via a connecting member 4 made of a flat plate member, and the power from the driving side rotating member 1 is rotated via the connecting member 4 on the driven side. To be transmitted to member 2.

[0033] The driving side rotating member 1 and one end of the connecting member 4 are fixed by a first fixing member 5, and the driven side rotating member 2 and the other end of the connecting member 4 are second fixed. It is fixed by member 6. In this embodiment, when the power from the driving side rotating member 1 is transmitted to the driven side rotating member 2 via the connecting member 4, the first fixing member 5 is connected when the transmitted power exceeds the set value. By disengaging from the member 4, the power transmission is cut off. It is also possible to block this power transmission on the second fixing member 6 side. A fixing member configured to be able to be detached from the connecting member 4 to interrupt power transmission, in this embodiment, the first fixing member 5 is completely separate from the rotating members 1 and 2 and the connecting member 4. It is composed of a columnar fixing member. In this embodiment, the fixing member 5 is composed of a rivet-like member having a head 8 having a diameter larger than that of the columnar shaft portion 7 on one end side of the columnar shaft portion 7 before mounting. Is caulked in the axial direction, so that the drive side rotating member 1 and the connecting member 4 are fixed via the fixing member 5! /, (9 indicates the caulking portion! /, Ru) . In this embodiment, the same fixing structure by caulking is also applied to the second fixing member 6 side that is not intended to be detached. The fixing structure on this side is not particularly limited. However, when the fixing member 5 is detached from the connecting member 4, the connecting member 4 can rotate around the second fixing member 6. Is set to

[0034] In the present embodiment, the three connecting members 4 are arranged in the rotational direction (the direction indicated by the arrow R in FIG. 1A), and each connecting member 4 is arranged in the radial direction of the rotating members 1 and 2. In contrast, the rotating member is arranged so as to be inclined in the rotation direction R. Each connecting member 4 is formed with a hole 10 through which the columnar shaft portion 7 of the first fixing member 5 is inserted, and is connected to the hole 10 to open in the rotation direction R of the rotating member. A notch 11 is provided. Through this notch 11, the first fixing member 5 can be detached in the rotation direction R of the rotating member.

FIG. 2 shows a power transmission device according to a second embodiment of the present invention, in which (A) is a front view thereof, and (B) is a sectional view taken along line BB in FIG. (A). Show. This second embodiment differs from the first embodiment shown in FIG. 1 only in that a disk (disk-shaped member) fixed to the one rotating member so as to rotate integrally therewith is provided. Since the other parts are basically the same as those in the first embodiment, the same members as those shown in FIG. 1 are denoted by the same reference numerals as those in FIG. In the structure shown in FIG. 2, a disk 21 is provided between the driving side rotating member 1 and the connecting member 4 so as to be rotatable together with the driving side rotating member 1. It is fixed to the driving side rotating member 1 via a fixing bolt 22. Therefore, the drive side rotation member 1 and the disk 21 in FIG. 2 can be combined and regarded as the drive side rotation member in the present invention. Note that reference numeral 23 in FIG. 2 denotes a hole formed in the drive-side rotating member 1 in order to avoid interference with the force and the fastened fixing member 5. By providing such a disk 21, as described above, for example, the disk 21 and the connecting member 4 can be assembled first via the fixing member 5, and the assembly can be attached to the drive-side rotating member 1. Bolts can be fastened. As a result, the assembly can be facilitated, the control of the caulking force of the fixing member 5 can be facilitated, and the setting of the power cut-off characteristics can be facilitated and the accuracy can be improved.

[0036] The relationship between the notch 11 and the hole 10 formed in the connecting member 4 in each of the above embodiments is illustrated in FIGS. 3A and 3B in the case of the second embodiment. . In the configuration shown in FIG. 3 (A), the notch 11 is formed by being curved along the circumferential direction of the disk 21, and the width W of the notch 11 is expressed by the difference between the curvature radii R1 and R2. The In this case, the relationship between the diameter Φ の of the hole 10 and the width W (= R1—R2) of the notch 11 satisfies φ Η≥ (ΐη—R2). It is preferable. By satisfying this relationship, the fixing member 5 is more securely held in the hole 10 before the fixing member 5 is detached. In the configuration shown in FIG. 3 (B), the notch 11 is opened in a linearly extending shape, and the relationship between the width W and the diameter φH of the hole 10 satisfies φH≥W. ! /, I like to do it! / ...

[0037] FIG. 4 sequentially shows the state when the fixing member 5 is caulked. As shown in FIG. 4 (A), before caulking, the fixing member 5 includes the columnar shaft portion 7 and its It has a head 8 at one end. The columnar shaft portion 7 of the fixing member 5 is passed through the hole portion 10 of the connecting member 4 and the hole 24 formed in the disk 21 (FIG. 4B). The opposite end is caulked (Fig. 4 (C)). The caulking portion 9 is formed by plastic deformation. It is preferable that the diameter of the hole 10 of the connecting member 4 and the hole 24 of the disk 21 be set slightly larger than the outer diameter of the columnar shaft 7, which facilitates insertion. It is.

When caulked as described above, as shown in FIG. 5, a strong fixing force is exerted in the axial direction by the head 8 and the caulking portion 9 of the fixing member 5, and the disk 21 and the connecting member 4 are securely connected. It is fixed to. In addition, since the columnar shaft portion 7 is expanded in the radial direction when the force is applied, the columnar shaft portion 7 applies a compressive force to the inner peripheral surface of the hole portion 10 of the connecting member 4 and the hole 24 of the disk 21, Even during this time, the fixing member 5 and the disk 21 and the connecting member 4 are securely fixed. Thus, the connecting member 4 is held with a desired force by caulking the fixing member 5 accompanied by plastic deformation. In fixing the connecting member 4 and the disk 21 via the fixing member 5, the detaching force of the fixing member 5 from the connecting member 4 can be controlled by the caulking force of the fixing member 5, and the caulking force is Since the optimum force can be easily set by controlling the force applied from both sides of the fixing member 5 in the axial direction during caulking, the shut-off power value when excessive transmission power is generated is accurately set to the desired value. Is set. As described above, the fixing member 5 is fixed by caulking accompanied by plastic deformation, so that an excessively transmitted power force for detaching the fixing member 5 from the connecting member 4 is accurately and easily set to a desired value.

FIG. 6 shows how the fixing member 5 is detached from the connecting member 4 when excessive transmission power exceeding the set value is applied to the embodiment shown in FIG. 2 (the embodiment shown in FIG. 1). Is basically the same). As shown in Fig. 6 (A), when excessive transmission power is applied, the hole 31 and the notch 11 of the connecting member 4 are placed outside the portion 31 positioned radially outward. Deformation force in the direction of spreading is exerted, and the distal end portion of the connecting member 4 is deformed mainly so as to cut the inner contact surface portion of the portion 31. As a result, the fixing member 5 is detached from the connecting member 4 through the deformed notch 11 and is driven from the driving side rotating member 1 and the disk 21 to the driven side rotating member 2 via the connecting member 4! /, Power transmission is interrupted (Fig. 6 (B)). Even after the power transmission is cut off, the disk 21 side is rotated (idled) as shown in Fig. 6 (C). The fixing bolt 22 rotates and hits the shoulder of the connecting member 4 so that the connecting member 4 is fixed. 6 Rotate around. When the connecting member 4 is rotated to the position shown in FIG. 6 (D), the drive-side rotating member 1 and the disk 21 are rotated without interfering with the connecting member 4, and the desired power transmission interruption is completed. To do.

When the connecting member 4 is rotated around the fixing member 6 immediately after the power transmission is cut off, the connecting member 4 of the fixing member 5 is connected to the disk 21 as shown in FIG. A structure in which a pin-like protrusion 41 is provided which is abutted against the connecting member 4 supported by the other anti-detachment side fixing member 6 and rotates the connecting member 4 around the anti-detachment side fixing member 6 after the separation It is preferable to adopt the power. In particular, it is preferable that the pin-shaped protrusion 41 is provided at a position on the outer side in the radial direction of the rotating members 1 and 22 with respect to the anti-separation side fixing member 6 relative to the separation side fixing member 5. By providing such a dedicated pin-like protrusion 41, it is possible to force the connecting member 4 from which the fixing member 5 has been detached with less impact to rotate and retract quickly so as not to get in the way. In particular, by providing the pin-shaped protrusion 41 at a position radially outward from the fixing bolt 22, the connecting member 4 can be smoothly rotated with less impact.

[0041] Fig. 8 shows a power transmission device according to a third embodiment of the present invention, in which (A) is a front view thereof, and (B) is a sectional view taken along line BB in Fig. (A). Show. In the present embodiment, a fitting portion 12 that fits each other is provided between the columnar fixing member 5 and the connecting member 4 and / or between the connecting member 4 and the rotating member 1. Since the other parts are basically the same as those in the first embodiment, the same members as those shown in FIG. 1 are denoted by the same reference numerals in FIG.

FIG. 9 shows a power transmission device according to a fourth embodiment of the present invention, in which (A) is a front view thereof, and (B) is a sectional view taken along line BB in FIG. (A). Show. In this fourth embodiment 8 differs from the third embodiment shown in FIG. 8 only in that a disk (disk-shaped member) fixed to and integrally rotatable with one rotating member is provided. Since it is the same as the embodiment, the same members as those shown in FIG. 8 in FIG. 9 are denoted by the same reference numerals as those in FIG.

[0043] The relationship between the notch 11 and the hole 10 formed in the connecting member 4 in the third and fourth embodiments is illustrated in Fig. 10 for the case of the fourth embodiment. In the form shown in FIG. 10, the notch 11 is formed so as to open in a divergent shape along the circumferential direction of the disk 21. In this case, the relationship between the diameter φ の of the hole 10 and the width W of the notch 11 preferably satisfies W≥φ ≥. By satisfying this relationship, the fixing member 5 can be removed smoothly without any obstacle (without interfering with the inner surface of the notch 11). Prior to detachment, a predetermined positional relationship is maintained by caulking by the fixing member 5 and fitting by the fitting portion 12, and fixation between the two is also maintained with sufficient force.

[0044] FIGS. 11 and 12 illustrate a state in which the fixing member 5 is caulked and the configuration of the fitting portion. In the structure shown in FIG. 11, as shown in FIG. 11 (A), the fixing member 5 has a columnar shaft portion 7 and a head portion 8 at one end thereof before force fitting. In this example, the connecting member 4 is formed with a convex portion 13 made of a minute projection that protrudes toward the head 8 side of the fixing member 5. The columnar shaft portion 7 of the fixing member 5 is passed through the hole portion 10 of the connecting member 4 and the hole 24 formed in the disk 21 (FIG. 11 (Β)), and the head portion 8 of the columnar shaft portion 7 The opposite end is crimped (Fig. 11 (C)). The force and crimp portion 9 is formed by plastic deformation. At this time, the convex portion 13 bites into the inner surface of the head portion 8 of the fixing member 5 to form the concave portion 14 by force fitting force, and the convex portion 13 and the concave portion 14 are automatically fitted to each other, and a predetermined fitting is achieved. Part is formed. It is preferable that the diameter of the hole 10 of the connecting member 4 and the hole 24 of the disk 21 be set slightly larger than the outer diameter of the columnar shaft 7, which facilitates insertion. I can be taken.

In the structure shown in FIG. 12, compared to the structure shown in FIG. 11, as shown in FIG. 12 (A), the connecting member 4 has a convex portion 15 made of a minute protrusion protruding toward the disk 21 side. A through hole 16 is formed at a corresponding position of the disk 21. Prior to caulking, the fixing member 5 has a columnar shaft portion 7 and a head portion 8 at one end thereof. The columnar shaft portion 7 of the fixing member 5 is passed through the hole portion 10 of the connecting member 4 and the hole 24 formed in the disk 21 (FIG. 12 ( B)), the end opposite to the head 8 of the columnar shaft 7 is caulked (FIG. 12 (C)). The caulking portion 9 is formed by plastic deformation. At this time, the convex portion 15 is fitted into the hole portion 16 of the disk 21 and bites in, and the convex portion 15 and the hole portion 16 are fitted to each other to form a predetermined fitting portion. In addition, without providing the hole portion 16 in the disk 21, it is possible to adopt a form in which it is bitten during caulking, as in the form shown in FIG. Further, it can be formed in a hole portion that does not penetrate the hole portion 16 provided in the disk 21, or can be formed in a concave portion instead of the hole portion.

[0046] When the fixing member 5 is caulked as described above, a strong fixing force is exerted in the axial direction by the head portion 8 and the caulking portion 9 of the fixing member 5, and the disk 21 and the connecting member 4 are securely connected. Fixed to. In addition, since the columnar shaft portion 7 is radially expanded during the force and crimping, the columnar shaft portion 7 applies a compressive force to the inner peripheral surface of the hole portion 10 of the connecting member 4 and the hole 24 of the disk 21, Even during this time, the fixing member 5 and the disk 21 and the connecting member 4 are securely fixed. In this way, the connecting member 4 is held with a desired force by caulking the fixing member 5 accompanied by plastic deformation. When the connecting member 4 and the disk 21 are fixed via the fixing member 5, the detaching force of the fixing member 5 from the connecting member 4 can be controlled by the caulking force of the fixing member 5, and the caulking force is caulking. In this case, it is possible to easily set the optimum force by controlling the load applied from both sides of the fixed member 5 in the axial direction, so the cutoff power value when excessive transmission power is generated is set to the desired value with high accuracy. Is done. In this manner, the excessive transmission power for detaching the fixing member 5 from the connecting member 4 is accurately and easily set to a desired value by fixing by caulking accompanied by plastic deformation of the fixing member 5. In addition, the presence of the fitting portion 12 prevents the relative rotation between the fixing member 5 and the connecting member 4 more reliably, and more reliably prevents the occurrence of fretting wear and the like with higher accuracy. The cutoff power value of is set.

FIG. 13 shows how the fixing member 5 is detached from the connecting member 4 when an excessive transmission power exceeding a set value is applied to the embodiment shown in FIG. 9 (the implementation shown in FIG. 8). The aspect is basically the same). In the state shown in FIG. 13 (A), when excessive transmission power larger than the caulking force plus the engaging force at the fitting portion 12 is applied, the fixing member 5 is detached from the hole 10 of the connecting member 4 (FIG. 13). (B)). In the case of detachment, in the fitting part 12, the convex part on the connecting member 4 side is compatible so that the concave part on the fixing member 5 side is deformed into a groove shape. Since the pair moves, a groove 17 opened to the outer peripheral side of the fixing member 5 is formed on the fixing member 5 side. Further, at the time of separation, the width of the notch 11 is set larger than the diameter of the hole 10, so that the fixing member 5 is smoothly detached without causing interference with the hole 10 formation portion. As a result of the disengagement, the power transmission that has been performed from the driving side rotating member 1 and the disk 21 to the driven side rotating member 2 through the connecting member 4 is interrupted (FIG. 13B). Even after the power transmission is interrupted, the disk 21 side is rotated (idled) as shown in Fig. 13 (C). The fixing bolt 22 rotates and hits the front shoulder of the connecting member 4 to fix the connecting member 4. Rotate around member 6. When the connecting member 4 is rotated to the position shown in FIG. 6 (D), the drive side rotating member 1 and the disk 21 are rotated without interfering with the connecting member 4, and the desired power transmission is cut off. Is completed.

[0048] When the connecting member 4 is rotated around the fixing member 6 immediately after the power transmission is cut off, the connecting member 4 of the fixing member 5 is connected to the disk 21 as shown in FIG. A structure in which a pin-like protrusion 41 is provided which is abutted against the connecting member 4 supported by the other anti-detachment side fixing member 6 and rotates the connecting member 4 around the anti-detachment side fixing member 6 after the separation It is preferable to adopt the power. In particular, it is preferable that the pin-shaped protrusion 41 is provided at a position on the outer side in the radial direction of the rotating members 1 and 22 with respect to the anti-separation side fixing member 6 relative to the separation side fixing member 5. By providing such a dedicated pin-shaped protrusion 41, the connecting member 4 from which the fixing member 5 has been detached can be quickly rotated so as not to get in the way with a smaller impact, as in the embodiment shown in FIG. Can be moved away. In particular, by providing the pin-shaped protrusion 41 at a position more radially outward than the fixing bolt 22, the connecting member 4 can be smoothly rotated with even less impact.

[0049] The fitting portion 12 as described above can take various structures. Figures 15 (A) to 15 (E) show examples of various structures. In the structure shown in FIG. 15 (A), as described above, the protrusion 15 formed on the connecting member 4 and the hole formed on the disk 21 so that the fitting part 12 protrudes toward the disk 21 side. The protrusion 13 formed on the connecting member 4 so as to protrude toward the head of the fixing member 5 is formed by fitting with the portion 16 (shown in (a)). It is structured so that it can be fitted into the inside of the unit! /, (Shown in (b)). The structure shown in FIG. 15B is provided with a plurality of fitting parts 12 having the same structure ((a) and (b)) (in the illustrated example). 2 but 3 or more are possible). In the structure shown in FIG. 15 (C), a short arc-shaped fitting part 31 is formed, and an arc-shaped convex part 32 formed on the connecting member 4 so as to protrude toward the disk 21 side. Is formed on the connecting member 4 so as to protrude toward the head side of the fixing member 5 (shown in (a)). The arcuate convex portion 34 thus formed is configured to be fitted so as to bite into the head of the fixing member 5! (Shown in (b)). In the structure shown in FIG. 15 (D), a recess 35 extending in a crescent shape along the peripheral edge of the hole 10 is formed on any surface of the connecting member 4, and the recess 35 is formed as a fixing member. 5 is fitted with the corresponding convex portion 36 provided on the head side (shown in (a)), or is fitted with the corresponding convex portion 37 provided on the disk 21 side. (shown in (b)) In the structure shown in FIG. 15 (E), as shown in FIG. 15 (a), a notch is formed in the outer periphery of the connecting member 4 in which the hole 10 is formed. 38 is formed (a total of two in opposite positions in the illustrated example), and separately from the fixing member 5, a member 40 having a protrusion 39 corresponding to the notch 38 as shown in (b) is prepared ( As shown in c) and (d), each protrusion 39 of the member 40 is fitted into the notch 38 of the corresponding connecting member 4 so that the member 40, the connecting member 4 and the disk 21 are interposed therebetween. In the state These are caulked by a fixing member 5. In the present invention, Rukoto to adopt a fitting portion structure other than the illustrated structure of the well is allowed warehouse.

FIG. 16 shows an example of the axial force generation mechanism in the power transmission device according to the fifth embodiment of the present invention. The configuration other than the axial force generation mechanism is the same as that shown in FIGS. It is practically the same. In this embodiment, the fixing mechanism by caulking the columnar fixing member 5 has an axial force generating mechanism capable of generating an elastic reaction force in the axial direction after caulking. This axial force generation mechanism is composed of the following mechanism. For example, as shown in FIG. 16, the distal end portion of the connecting member 4, that is, the connecting member 4 portion corresponding to the fixing portion by caulking of the columnar fixing member 5 and the peripheral portion thereof are bent in advance to have a predetermined shape (connecting portion). It is formed on the curved portion 4a of the member 4 (being bent so that the cross-section is locally curved with the longitudinal direction as the central axis) (Fig. 16 (A)). As shown in FIG. 16 (B), it is assembled so as to be sandwiched between the head 8 of the fixing member 5 and the disk 21 or the rotating member 1), and then fixed by caulking with a predetermined caulking force. Is deformed to be flat. Or After crimping, an elastic restoring force is applied to the flat curved portion 4a to return to the original curved shape, and an elastic reaction force is maintained in the axial direction of the fixing member 5. Since such an elastic reaction force always remains in the fixing mechanism by the force clamp, the axial fixing force after the force tightening is stably maintained at a desired force. If the size and material of the connecting member 4 such as the plate thickness are taken into account, the elastic reaction force can be accurately set to the target force by the shape of the curved portion 4a. The force can be set to the target force with high accuracy, and the desired release torque can be set stably. Therefore, a stable target power cut-off characteristic can be obtained with high accuracy. Note that the upper and lower views in FIG. 16 (B) show the bending direction force fixing member 5 head 8 direction of the bending portion 4a and the disc 21 (or rotating member 1) direction! Show me! /

FIG. 17 shows an example in which the bending portion 4b is formed in another shape, and the bending portion 4b is bent more locally. For example, as shown in FIG. 17 (A), the portion fixed by the fixing member 5 is bent around the tip of the connecting member 4 with the axis in the direction perpendicular to the longitudinal direction of the connecting member 4 as the center. It is. As shown in FIG. 17 (B), the curved portion 4b is assembled so as to be sandwiched between the head 8 of the fixing member 5 and the disk 21 or the rotating member 1). The bending portion 4b is deformed so as to be flattened with caulking force. After the caulking, an elastic restoring force is applied to the flat curved portion 4b to return to the original curved shape, and an elastic reaction force is maintained in the axial direction of the fixing member 5. In the upper and lower views in FIG. 17 (B), the bending direction of the bending portion 4b may be! / Or a deviation of the head 8 direction of the fixing member 5 and the disk 21 (or rotating member 1) direction! / Show me! /

[0052] After caulking, as shown in FIG. 18, the curved portion of the connecting member 4 becomes flat. 18A shows a case where the curved portion is sandwiched between the head 8 of the fixing member 5 and the disk 21 (or the rotating member 1). FIG. 18B shows the crimped portion of the fixing member 5 with the bending portion. Each of FIGS. 9 and 21 shows a case where the disk 21 is sandwiched between the rotating members 1), and any form is possible.

FIG. 19 shows another form. In this example, a washer 51 is interposed between the connecting member 4 and the columnar fixing member 5 in order to constitute an axial force generating mechanism, and this washer 51 is formed in a disc spring shape in advance. The shutter 51 assembled as shown in FIG. 19 (A) is deformed into a flat shape as shown in FIG. This is a mechanism for generating an elastic reaction force in the axial direction by the elastic restoring force of the washer 51. As the washer 51, a so-called spring washer may be used. Also by the insertion of the washer 51, a desired elastic reaction force can be generated in the axial direction as described above.

Industrial applicability

The power transmission device according to the present invention is basically applicable as a power transmission device in any device. It is particularly suitable for power transmission when there is a torque fluctuation in the drive source, for example, for power transmission using a vehicle prime mover as a drive source (for example, driving a compressor using a vehicle prime mover as a drive source). is there.

Claims

The scope of the claims

[1] A driving side rotating member and a driven side rotating member arranged concentrically, a connecting member extending between the driving side rotating member and the driven side rotating member, and connecting the driving side rotating member and the driven side rotating member; It has a first fixing member that fixes the driving side rotating member and the connecting member, and a driven side rotating member and a second fixing member that fixes the connecting member, and the driven side rotation from the driving side rotating member via the connecting member. In the power transmission device that transmits power to a member, and when the transmitted power exceeds a set value, the first fixed member or the second fixed member is disengaged from the connecting member to cut off the power transmission. The fixing member that is detached from the connecting member is constituted by a columnar fixing member that is separate from the rotating member and the connecting member, and the columnar fixing member is configured so that the columnar fixing member can be detached from the connecting member. Caulking in the axial direction A power transmission device characterized by fixing a rotating member and a connecting member.

[2] The fitting part according to claim 1, wherein a fitting portion that fits each other is provided between the columnar fixing member and the connecting member, between the connecting member and the rotating member, or both. Power transmission device.

[3] The power transmission device according to claim 2, wherein the fitting portion includes a fitting portion between a convex portion and a concave portion or a hole portion.

[4] The power transmission device according to claim 2, wherein the fitting portion includes a fitting portion between a protrusion and a notch.

5. The power transmission device according to claim 1, further comprising an axial force generation mechanism capable of generating an elastic reaction force in the axial direction after the fixing mechanism force by caulking the columnar fixing member.

6. The power transmission device according to claim 5, wherein the axial force generation mechanism is a mechanism that generates an elastic reaction force in the axial direction by an elastic restoring force of the connecting member itself.

7. The axial force generation mechanism according to claim 5, wherein the axial force generation mechanism includes a mechanism that generates an elastic reaction force in an axial direction by an elastic restoring force of a washer interposed between the connecting member and the columnar fixing member. Power transmission device.

[8] The power transmission device according to claim 1, wherein the connecting member is provided with a notch that opens in the rotation direction of the rotating member so that the columnar fixing member can be detached from the connecting member.

[9] The connection member according to claim 8, wherein a hole portion through which the columnar fixing member is passed is formed, and a width of the notch is set to be equal to or less than a diameter of the hole portion. Power transmission device.

10. The columnar fixing member according to claim 1, wherein the columnar fixing member includes a columnar shaft portion and a rivet-shaped member having a head having a diameter larger than that of the columnar shaft portion at one end thereof, and the rivet-shaped member is caulked in the axial direction. The power transmission device described.

11. The power transmission device according to claim 1, wherein the connecting member is a flat member.

12. The power transmission device according to claim 1, wherein a plurality of the connecting members are arranged in the rotation direction of the rotating member.

13. The power transmission device according to claim 1, wherein the connecting member is fixed to the rotating member so as to be rotatable around a fixing member opposite to the fixing member separated from the connecting member.

14. The power transmission device according to claim 1, wherein the connecting member is disposed so as to be inclined in a rotation direction of the rotation member with respect to a radial direction of the rotation member.

[15] A disc fixed to the rotating member so as to be integrally rotatable is provided between the driving side rotating member and the connecting member or between the driven side rotating member and the connecting member. The power transmission device according to claim 1, wherein the connecting member is fixed via a fixing member.

[16] After the fixing member is detached from the connecting member on the rotating member side, the connecting member is abutted against the connecting member supported by the other anti-detaching side fixing member, and the connecting member is moved around the anti-detaching side fixing member. 2. The power transmission device according to claim 1, further comprising a pin-like protrusion for rotation.

17. The power transmission device according to claim 16, wherein the pin-like protrusion is provided at a position on the outer side in the radial direction of the rotating member with respect to the anti-separation side fixing member relative to the separation side fixing member.

18. The power transmission device according to claim 1, wherein the columnar fixing member is an annealed member.

[19] The power transmission device according to claim 1, comprising a driving force of the driving side rotating member and a prime mover for a vehicle.

20. The power transmission device according to claim 1, which is used for a compressor.