JP2003139161A - Motive power transmission mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive motive power transmission mechanism applicable to the bidirectional rotation of a pulley. SOLUTION: The power transmission mechanism comprises a first rotating member 1 having first locking portions 5, 6, a second rotating member 7 having second locking portions 10, and a spring steel elastic member 11 formed in a largely openable approximate C-shape. The inner periphery face at the opening edge of the elastic member 11 is locked to the first locking portions 5, 6 with its opening portion largely opened and the outer periphery face of an approximately central portion of the elastic member 11 facing the opening portion is locked to the second locking portion 10, whereby the first rotating member 1 and the second rotating member 7 are connected together via the elastic member 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission mechanism assembled in a car air conditioner compressor or the like, and more particularly to a power transmission mechanism that cuts off power transmission when an overload is applied.

[0002]

2. Description of the Related Art As a power transmission mechanism of this type, there is one disclosed in Japanese Patent Application Laid-Open No. 10-267048. A power transmission mechanism illustrated as an example of an embodiment in this publication includes a hub formed with a flange portion extending in a radial direction and mounted on a tip of a rotary shaft of a compressor, and an outer peripheral surface of a flange portion of the hub. A cylindrical portion having inner circumferential surfaces facing each other in the radial direction is formed, and is formed by bending a pulley rotatably supported in the housing of the compressor and a rectangular leaf spring into a U shape, and is spaced in the circumferential direction. A plurality of elastic members arranged at intervals are provided. The elastic member includes a retainer extending through one of the ends of the bent portion (the end of the pulley in the rotation direction side) through the lock claw, and the other end of the bent portion (the end of the pulley opposite to the rotation direction). Section) and has a hook that is bent outward in the radial direction.

Further, on the flange portion of the hub, there is provided a protrusion having an arc-shaped guide surface at the tip thereof, which is brought into contact with the lock claw of the elastic member, and the elastic member provided on the pulley rotation direction side with respect to the protrusion. While the retainer is accommodated, the accommodating portion in which the retainer tip is locked at the corner of the bottom portion, the holding groove that is open to the retainer accommodating portion side at the root portion of the protrusion,
A recess is provided on the opposite side of the pulley from the protruding portion, in which the hook side of the elastic member is accommodated, and a locking groove in which the hook of the elastic member that is connected to this recess and is bent outward in the radial direction is locked The locking portion of the elastic member is provided. Further, the inner peripheral surface of the cylindrical portion of the pulley is provided with a locking portion having an arc-shaped locking groove in which the bent portion of the elastic member is locked.

In the conventional power transmission mechanism having such a structure, since the hub and the pulley are connected by the elastic member, the power can be transmitted to the compressor. Further, in such a power transmission state, when an abnormality occurs in the compressor and an overload is applied to the power transmission mechanism, the elastic member causes the bent portion to be pressed by the locking groove of the pulley and the retainer to elastically deform, and the lock to be generated. Since the pawl moves along the guide surface of the hub to be locked in the holding groove of the hub and the bent portion is disengaged from the locking groove of the pulley, power transmission is cut off. Further, in the conventional power transmission mechanism, since the lock claw of the elastically deformed elastic member is locked in the holding groove formed in the locking portion of the hub, it is possible to maintain the state in which power transmission is interrupted.

[0005]

In the conventional power transmission mechanism, an overload is applied to press the bent portion of the elastic member in the locking groove of the pulley, and the bent portion of the elastic member and the retainer are elastically deformed. The lock claw of the elastic member moves along the guide surface of the hub locking part and is locked in the holding groove of the hub locking part. The shape of the elastic member and the internal shape of the hub locking part are complicated. Is. Further, in the conventional power transmission mechanism, the guide surface of the locking portion of the hub is formed on the wall surface of the protruding portion on the rotation direction side of the pulley, and is used only for rotation of the pulley in one direction. Further, in the conventional power transmission mechanism, the spring load of the elastic member is set so that the power transmission is interrupted when the load torque exceeds the set value, but it is difficult to finely adjust the spring load. Further, the elastic member may be damaged due to the stress limit when the plate thickness is increased to increase the spring load.

The present invention has been made in order to solve these problems, and has a simple structure, but has a highly reliable operation when an overload is applied, and a rotation of a pulley in both directions. It is an object of the present invention to provide a power transmission mechanism that can be used at low cost.

[0007]

In order to achieve such an object, the power transmission mechanism of the first invention (claim 1) includes a first rotating member (which is rotatably arranged on a coaxial line). 1) and the second rotating member (7) and the flange portion (1b) extending in the radial direction of the first rotating member (1) so as to project toward the second rotating member (7) side, A first locking portion (1) of the first rotating member (1) in which a connecting portion (5) at an end portion and a support portion (6) at an end portion in the counter-rotational direction are provided at a predetermined interval in the rotational direction ( 5 and 6) and the first rotary member (1) side projecting from the flange portion (7c) extending in the radial direction of the second rotary member (7), and the peripheral surface serving as a pressing surface. A second locking portion (10) of the two rotating member (7),
It is formed into a substantially C-shape that can be opened and closed, and is arranged between the flange portion (1b) of the first rotating member (1) and the flange portion (7c) of the second rotating member (7). And an elastic member (11) made of spring steel for expanding the opening to lock the inner peripheral surface of the opening edge of the elastic member (11) to the first locking portion (5, 6). , The first rotating member (1) and the second rotating member by locking the outer peripheral surface of the substantially central portion of the elastic member (11) facing the opening to the second locking portion (10). (7) the elastic member (1
It is characterized in that they are connected by 1).

A power transmission mechanism according to a second aspect of the present invention is the same as the power transmission mechanism according to the first aspect of the present invention.
In (1), a concave and convex engagement is formed at an opening edge portion to be assembled on the rotational direction side, and an inner peripheral surface thereof is engageable with and disengageable from a connecting portion (5) of the first locking portion of the first rotating member (1). Engaged part (1
2), a pivoting portion (13) formed at an opening edge portion which is assembled on the side opposite to the rotation direction, and an inner peripheral surface of which is pivotally attached to a supporting portion (6) of the first locking portion, and the engagement. The second locking portion (1) of the second rotating member (7) is formed at a substantially central portion facing the opening between the portion (12) and the pivotal portion (13) and has an outer peripheral surface.
0), the pressed surface (14) that is engaged and disengaged with the pressing surface so as to be able to engage and disengage, the engaging portion (12) and the pressed area (1).
4), and a holding portion (16) formed at a portion between the inner circumferential surface and the connecting portion (5) of the first locking portion.

A power transmission mechanism according to a third invention (claim 3) is the power transmission mechanism according to the second invention, wherein the elastic member (1
In the engaging portion (12) and the pivotally attaching portion (13) and the pressed portion (14) and the holding portion (16) of 1), the first engaging portion (5, 6) or the second engaging portion (10) is provided. Locking groove (12a,
13a, 14a, 16a) are formed.

A power transmission mechanism according to a fourth aspect of the present invention is the same as the power transmission mechanism according to the third aspect.
1) is formed in a symmetrical shape with respect to a symmetry axis (Y) that passes through the opening portion and the pressed portion (14), and
Another holding portion (16) having an engagement groove (16a) formed in the inner peripheral surface is provided in a portion between the portion 3) and the pressed portion (14).

A power transmission mechanism of a fifth invention (claim 5) is the elastic member (11) of the power transmission mechanism of the first to fourth inventions, wherein a plurality of spring steel plates having the same shape are stacked.
Is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The power transmission mechanism of the present invention will be described below with reference to the accompanying drawings. 1 is a front view in which a part of the power transmission mechanism is broken, and FIG. 2 is FIG.
FIG. 3 is a plan view of the elastic member, and FIG. 4 is an explanatory view showing the engagement / disengagement state of the elastic member and the first locking portion.
FIG. 5 is an explanatory view illustrating a state in which the engaging portion of the elastic member is disengaged from the first locking portion. The power transmission mechanism of these drawings includes a hub as a first rotating member mounted on a rotating shaft of a compressor for a car air conditioner, a pulley as a second rotating member rotatably supported by a housing of the compressor, and these hubs. It is composed of an elastic member or the like that connects pulleys so that power can be transmitted, and is used as a safety device that shuts off power transmission to the rotary shaft of the compressor when the load torque of the compressor increases.

The hub 1 has a cylindrical boss 1a spline-fitted to the rotary shaft 2 of the compressor, and the boss 1a.
A disc-shaped flange portion 1b extending radially outward from the outer peripheral surface of a is integrally formed, and a stopper ring 3 is fitted in the boss portion 1a. This hub 1 is spline-fitted to the rotary shaft 2 until the stopper ring 3 comes into contact with the tip of the rotary shaft 2, and a bolt 4 inserted from the center hole of the stopper ring 3 is screwed into the screw hole of the rotary shaft 2. As a result, the rotary shaft 2 is mounted. When the hub 1 is mounted on the rotary shaft 2, the tip of the rotary shaft 2 and the stopper ring 3 are
A shim for position adjustment is interposed between and.

The flange 1b of the hub 1 has a pair of headed locks as first locks protruding from the side surface toward a pulley 7 which will be described later, more specifically, toward the bearing 8. Three sets of pins 5 and 6 are fixed. The first locking portion is provided at a position that divides the circumferential direction of the flange portion 1b into three equal parts,
The headed locking pin 5 in the rotation direction (direction of arrow T, see FIG. 1) is configured as a connecting portion of the first locking portion, and the headed locking pin 6 in the counter rotation direction is a support portion of the first locking portion. The headed locking pin 5 and the headed locking pin 6 having the same shape are planted in the flange portion 1b at a predetermined interval in the rotational direction. In the embodiment, the headed locking pin 5,
By inserting the small-diameter tip of 6 into the through hole formed in the flange portion 1b and plastically deforming the tip protruding on the opposite side by caulking, the headed locking pins 5 and 6 are formed.
It is fixed to b.

The pulley 7 is rotatably supported by a cylindrical portion 2a formed on the front housing of the compressor with a bearing 8 interposed therebetween, and an inner cylindrical portion 7a into which an outer ring of the bearing 8 is press-fitted and an outer peripheral surface thereof. An outer cylindrical portion 7b in which the belt groove is rolled and a disc-shaped flange portion 7c that connects end portions of the cylindrical portions 7a and 7b on the hub 1 side are provided. Further, the flange portion 7c of the pulley 7 is provided with screw holes at positions that divide the circumferential direction into three equal parts, and three collars 10 fixed by screwing screws 9 into the respective screw holes are attached to the flange 7c. It projects from the portion 7c toward the hub 1 side. And each color 10
Is configured as a second locking portion whose peripheral surface is a pressing surface. In the embodiment, the collar 10 includes the headed locking pin 5, so that an isosceles triangle can be drawn by connecting the center points of the collar 10 and the centered points of the headed locking pins 5, 6.
Flange portion 1b of the hub 1 disposed radially outward of the hub 6
It projects to the outside in the radial direction.

The elastic member 11 is manufactured by punching a spring steel plate having a thickness of about 0.5 mm to 1.5 mm by press punching, heat-treating and surface-treating, and the opening portion is expanded. It is formed into a shape having a substantially C-shape, and is arranged between the flange portion 1b of the hub 1 and the flange portion 7c of the pulley 7 in a stacked state. Further, the elastic member 11 is formed in a bilaterally symmetrical shape with respect to the symmetry axis Y (a straight line passing through the center of the power transmission mechanism) shown in FIG. 3, and the opening edge portions facing each other through the opening gap are the first member. The outer peripheral surface of the central portion facing the opening portion is locked to the second locking portion (collar 10) by being locked to the stop portions (headed locking pins 5 and 6).

That is, in the elastic member 11 shown as the embodiment, the engagement is such that the opening edge portion assembled on the rotational direction T side is engaged with the headed locking pin 5 (the connecting portion of the first locking portion). The portion 12 is provided, and an arcuate engagement groove 12a is formed on the inner peripheral surface thereof. Further, the elastic member 11 has a pivotal attachment portion 13 whose opening edge portion assembled on the side opposite to the rotational direction is rotatably engaged with the headed engagement pin 6 (support portion of the first engagement portion).
And an arcuate locking groove 13a is formed on the inner peripheral surface thereof. Further, the elastic member 11 is provided with a central portion facing the opening as a pressed portion 14, and an engaging groove 14a for pressing the peripheral surface (pressing surface) of the collar 10 (second locking portion) is provided on the outer peripheral surface thereof. Has been formed.

Further, the elastic member 11 is provided with arcuate expansion parts 15 on the left and right of the pressed part 14, and is located between the expansion part 15 and the engaging part 12 on the rotational direction T side and in the opposite direction. A holding portion 16 is individually provided at a portion between the expanding portion 15 and the pivotally attaching portion 13 on the rotation direction side. The inner peripheral surface of the holding portion 16 is
An arc surface 16a connected to the edge portion 15b of the concave inner peripheral surface 15a of the expansion portion 15, and an edge portion 12b (or engagement of the pivotal portion 13) of the engagement groove 12a of the engagement portion 12 from the arc surface 16a. Tapered surface 16b extending toward the edge 13b) of the groove 13a
Is provided. Reference numeral 17 in FIG. 2 is a shim fitted to the headed locking pins 5 and 6, and in order to reduce the rotation resistance of the elastic member 11, the flange portion 1b of the hub 1 and the elastic member 11 are combined. Is intervened between.

In the power transmission mechanism having such a structure, a belt (not shown) is hung on the pulley 7 supported by the cylindrical portion 2a of the compressor, and a collar 10 (second locking portion) fixed to the pulley 7 is provided. Since the headed locking pins 5 and 6 (first locking portions) fixed to the hub 1 are connected by the elastic member 11 that is stacked, a compressor can be driven by the power of the drive source side. it can.

Further, in the power transmission mechanism, when the load torque of the compressor becomes excessive and an overload is applied, the pressed portion 14 of the elastic member 11 causes the collar 10 to be pressed by the power of the drive source side.
The peripheral surface of the (second locking portion) is pressed in the rotation direction T. Further, the elastic member 11 is rotated around the headed locking pin 6 (supporting portion of the first locking portion) to lock the locking groove 14a of the pressed portion 14 and the collar 10 (second locking portion). And the engagement groove 12a of the engagement portion 12 and the headed engagement pin 5 (connecting portion of the first engagement portion) are released (see FIG. 4). .

Further, when the engaging groove 12a of the engaging portion 12 gets over the headed engaging pin 5 (the connecting portion of the first engaging portion), the elastic member 11 is elastically restored by an elastic restoring force to close the opening portion. , The tapered surface 16b and the headed locking pin 5 (the connecting portion of the first locking portion) to the arc surface 16b and the headed locking pin 5
The (locked portion of the first locking portion) is locked, and the pressed portion 1
4 and the collar 10 (second locking portion) are completely separated from each other. Further, in the elastic member 11, the separated state between the pressed portion 14 and the collar 10 (second locking portion) is maintained by the elastic return force.

As described above, as the embodiment, the power transmission mechanism in which the left and right symmetrical elastic members are assembled and which can respond to both rotations of the pulley has been described. However, the power transmission mechanism of the present invention corresponds to the rotation of the pulley in only one direction. It may be a power transmission mechanism. For example, a configuration may be adopted in which a through hole is formed in the pivotally-attached portion 13 of the elastic member 11 and the collar 10 (second locking portion) is inserted into the through hole. Further, the first locking portion is composed of the headed locking pins 5 and 6 fixed to the flange portion 1b of the hub 1, but as a rectangular parallelepiped locking member having arcuate end faces in the rotation direction and the counter rotation direction. Good.

Further, in the power transmission mechanism of the embodiment, the first rotating member is the hub 1 and the second rotating member is the pulley 7, but the hub 1 is the second rotating member and the pulley 7 is the first rotating member. You may comprise. That is, in the configuration in which the hub 1 is provided with the second locking portion (the collar 10 in the embodiment) and the pulley 7 is provided with the first locking member (the headed locking pins 5 and 6 in the embodiment). Good. Although the power transmission mechanism has been described as being assembled to the car air-conditioning compressor, the power transmission mechanism of the present invention can be used by being assembled to another driven-side device or drive-side device.

[0024]

According to the power transmission mechanism of the first invention (claim 1), the opening portion of the elastic member is expanded to lock the inner peripheral surface of the opening edge portion to the first locking portion, and By locking the outer peripheral surface of the substantially central portion facing the portion to the second locking portion,
Since the first rotating member and the second rotating member are connected by the elastic member, the shapes of the elastic member and the first locking portion and the configuration in which these elastic members are engaged with the first locking portion are simplified, and the elastic member Also, the machining of the first locking portion and the work of assembling the elastic member are simplified. Therefore, productivity is improved and the cost of the power transmission mechanism is reduced.

A power transmission mechanism according to a second aspect of the present invention (claim 2) is formed in the elastic member at a portion between the engaging portion and the pressed portion, and the inner peripheral surface thereof is the connecting portion of the first engaging portion. Since the holding portion that can be engaged with the elastic member is provided, after the overload is applied and the engagement between the engaging portion of the elastic member and the connecting portion of the first locking portion is released, the holding portion of the elastic member is changed to the first engaging portion. It is locked to the connecting portion of the stopper, and its state is maintained by the elastic restoring force of the elastic member. Therefore, it is possible to prevent the elastic member from dropping or scattering after the overload is applied and the power transmission is interrupted.

A power transmission mechanism according to a third aspect of the present invention (claim 3) relates to an engaging portion, a pivotally attached portion, a pressed portion and a holding portion of an elastic member, and a first locking portion or a second locking portion. Since the locking groove to be stopped is formed and the opening portion of the elastic member is expanded to lock the locking groove to the locking portion, the first rotating member and the second rotating member can be easily Can be connected.

In the power transmission mechanism according to the fourth aspect of the present invention (claim 4), the elastic member is formed in a bilaterally symmetric shape with respect to the axis of symmetry passing through the opening portion and the pressed portion. Since another holding portion having an engaging groove formed in the inner peripheral surface is provided in a portion between and, the elastic member can be assembled regardless of the rotation direction of the first and second rotating members. In addition to the above, it is possible to inexpensively provide a power transmission mechanism that can respond to the rotation of the first and second rotating members in both directions.

In the power transmission mechanism according to the fifth aspect of the present invention (claim 5), since the elastic member having a structure in which a plurality of spring steel plates having the same shape are stacked is provided, the setting value (the limit value of power transmission) can be easily adjusted. You can Therefore, it is possible to provide a power transmission mechanism that has a simple structure but has high reliability of operation when an overload is applied.

[Brief description of drawings]

FIG. 1 is a front view in which a part of a power transmission mechanism shown as an embodiment of the present invention is cut away.

FIG. 2 is a sectional view of the power transmission mechanism of FIG.

FIG. 3 is a plan view of an elastic member.

FIG. 4 is an explanatory view illustrating a state where the elastic member and the first locking portion are disengaged from each other.

FIG. 5 is an explanatory diagram illustrating a state in which the engaging portion of the elastic member is disengaged from the first locking portion.

[Explanation of symbols]

1 hub (first rotating member) 1b Flange part 5 Headed locking pin (connecting part of the first locking part) 6 Headed locking pin (supporting part of the first locking part) 7 Pulley (second rotating member) 7c Flange part 10 colors (second locking part) 11 Elastic member 12 Engagement part of elastic member 13 Pivoting part of elastic member 14 Pressed part of elastic member 16 Retaining part for elastic member

Claims (5)

[Claims] 1. A first rotating member and a second rotating member which are rotatably arranged on a coaxial line, and a flange portion extending in the radial direction of the first rotating member from the second rotating member side. A first locking portion of the first rotating member that protrudes and is provided with a connecting portion at an end portion in the rotation direction and a support portion at an end portion in the counter-rotation direction at a predetermined interval in the rotation direction; The second locking portion of the second rotating member, which projects from the flange portion extending in the radial direction of the two rotating member toward the first rotating member and has the peripheral surface as a pressing surface, and a substantially C-shaped portion that can be expanded. An elastic member made of spring steel, which is formed in a V-shape and is arranged between the flange portion of the first rotating member and the flange portion of the second rotating member, is provided with the elastic portion by expanding the opening portion. The inner peripheral surface of the opening edge portion of the member is locked to the first locking portion, and the elastic portion facing the opening portion Substantially by the outer peripheral surface of the central portion it is engaged with the second engaging portion, a power transmission mechanism, characterized in that said second rotary member and the first rotating member is connected by the elastic member. 2. The power transmission mechanism according to claim 1, wherein the elastic member is formed at an opening edge portion which is assembled in a rotational direction side, and an inner peripheral surface of the first locking portion of the first rotating member. The engaging portion is engaged with the connecting portion so as to engage and disengage so as to be disengageable, and the opening edge portion which is assembled on the side opposite to the rotation direction, and the inner peripheral surface is pivotally attached to the support portion of the first engaging portion. The outer peripheral surface is formed at a pivotal attachment portion and a substantially central portion facing the opening between the engagement portion and the pivotal attachment portion, and the outer peripheral surface is engaged with and separated from the pressing surface of the second locking portion of the second rotating member. A pressed portion that is freely engaged and recessed, and a holding portion that is formed at a portion between the engaging portion and the pressed portion and has an inner peripheral surface that can engage with the connecting portion of the first locking portion. A power transmission mechanism comprising: and. 3. The power transmission mechanism according to claim 2, wherein the engaging portion, the pivotally attached portion, the pressed portion and the holding portion of the elastic member are
A power transmission mechanism, wherein a locking groove for locking the first locking portion or the second locking portion is formed. 4. The power transmission mechanism according to claim 3, wherein the elastic member is formed in a symmetrical shape with respect to an axis of symmetry passing through the opening portion and the pressed portion, and the pivotally attached portion and the pressed portion are formed. The power transmission mechanism is characterized in that another holding portion having an engagement groove formed on the inner peripheral surface is provided at a portion between the two. 5. The power transmission mechanism according to claim 1, further comprising an elastic member having a structure in which a plurality of spring steel plates having the same shape are stacked.