JP2000179455A - Motive power transmission of clutchless compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutchless compressor capable of appropriately shielding a motive power transmitting passage from a pulley to a driving force- transmitting body in the case of an excess load torque at a compressor side. SOLUTION: In the case where a load torque at a compressor side is within a predetermined value, a rotation force of a pulley 10 is transmitted to a rotation shaft 2 through a damper rubber 60, a damper retaining plate 50, a friction material-mounting plate 40, a friction material 42 and a hub 20 and the rotation shaft 2 is rotated. At this time, a load torque variation at the compressor side is relaxed by the damper rubber 60. In the case where the load torque at the compressor side is not less than a predetermined value, the damper retaining plate 50 is rotated against the hub 20 in resistant to an engagement of the friction material 42 with the hub 20. At the same time, the friction material- mounting plate 40 on which a female screw 46 is formed is also rotated and is moved to a left direction. As a result, the engagement of the friction material 42 with the hub 20 is released and a transmission of a driving force from the pulley 10 to the rotation shaft is interrupted. The pulley is subjected to slipping of the pulley 10 in a state of holding the damper rubber 60 by a holder plate 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a clutchless compressor.

[0002]

2. Description of the Related Art In a compressor with a clutch used as a refrigerant compressor of an air conditioner for an automobile, a driving force of an engine is transmitted to a rotating shaft of the compressor via an electromagnetic clutch.

[0003] In this compressor with a clutch, when an abnormality such as seizure occurs inside the compressor, the electromagnetic clutch is disengaged based on the temperature and pressure inside the compressor to prevent engine stall due to excessive load on the engine. are doing.

On the other hand, a clutchless compressor that does not use an electromagnetic clutch has a mechanism that cuts off the transmission of power from the pulley to the rotary shaft of the compressor when an abnormality such as seizure occurs inside the compressor.

Japanese Patent Laid-Open Publication No. Hei 10-47244 discloses a clutchless compressor that shuts off power by utilizing the melting of a thermoplastic resin material.

In this clutchless compressor, an interposed member composed of a connecting pin made of a metal material and an elastically deformable portion made of a thermoplastic resin material in a disk shape is provided between the drive shaft and the pulley. Is provided.

The elastic deformation portion of the interposition member is connected to the drive shaft, and a connecting pin protruding from the elastic deformation portion is pressed against the pulley. The interposition member can rotate integrally with the pulley.

When the load torque on the compressor side fluctuates, the elastically deforming portion elastically deforms. For example, when the load torque becomes excessive, the connecting pin melts the elastically deformed portion due to frictional heat generated by the relative sliding of the press contact portion between the connecting pin and the pulley, and the connecting pin rotates relative to the elastically deformed portion. I do.

[0009]

However, Japanese Patent Application Laid-Open No.
The clutchless compressor disclosed in Japanese Patent No. 47244 has the following problem.

When the load torque on the compressor side becomes excessive, the elastically deforming portion is melted by frictional heat generated by the relative sliding of the press contact portion, and the connecting portion rotates relative to the elastically deforming portion. However, the time required for the elastically deformed portion (thermoplastic resin material) to melt greatly varies depending on the temperature of the atmosphere in which the clutchless compressor is used, so that the power transmission path cannot be properly shut off.

That is, when the ambient temperature is low, the thermoplastic resin material is not easily melted, and an excessive torque is applied to the belt for a long time, so that the belt may be cut. On the other hand, when the ambient temperature is high, the thermoplastic resin material is immediately melted, and the power transmission path may be interrupted before reaching an excessive torque at which power transmission should be interrupted.

The present invention has been made in view of such circumstances, and an object thereof is to appropriately block a power transmission path from a pulley to a driving force transmission body when a load torque on a compressor side becomes excessive. It is to provide a clutchless compressor that can be used.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 is an invention in which a pulley rotatably mounted on a housing and a rotary shaft integrally provided on a rotating shaft protruding from the housing to the outside. In a power transmission device for a clutchless compressor that transmits a driving force of an external drive source to the rotating shaft via a friction material provided between the rotating shaft and the shaft-side rotating body, the clutch body is opposed to the rotating shaft-side rotating body in an axial direction. A damper holding plate, a friction material holding plate fixed to the damper holding plate and holding the friction material in contact with the rotating shaft side rotating body, and a load interposed between the pulley and the damper holding plate. An elastic member that absorbs fluctuations in torque, and when the load torque is greater than or equal to a predetermined value, and the damper holding plate rotates against the frictional force between the friction material and the rotating shaft side rotating body. It said friction member holding plate is moved in the axial direction of the rotary shaft, characterized in that it comprises a blocking means for blocking power transmission between the pulley and the rotating shaft.

When the load torque on the compressor side exceeds a predetermined value, the damper holding plate rotates against the frictional force between the friction material and the rotating body on the rotating shaft side, and the friction material holding plate rotates on the rotating shaft. It moves in a direction away from the side rotating body, and power transmission between the pulley and the rotating shaft is cut off.

According to a second aspect of the present invention, in the power transmission device for a clutchless compressor according to the first aspect, the blocking means includes a male screw formed on the rotary shaft-side rotating body and the friction material holding plate. And a female screw to be screwed with the male screw.

When the load torque on the compressor side exceeds a predetermined value, the damper holding plate rotates against the frictional force between the friction material and the rotating body on the rotating shaft side, and the internal thread of the friction material holding plate and The screw engagement with the rotating shaft side rotating body male screw is loosened, and the friction material holding plate moves in a direction away from the rotating shaft side rotating body.

According to a third aspect of the present invention, in the power transmission device for a clutchless compressor according to the first or second aspect, a regulating member for regulating a moving amount of the friction material holding plate is provided on the rotating shaft. It is characterized by having.

When the frictional engagement between the female screw and the male screw is loosened and the friction material holding plate moves in a direction away from the rotary shaft side rotating body, the friction material holding plate abuts on the regulating member, and the movement in the axial direction is restricted by the regulating member. Be regulated.

According to a fourth aspect of the present invention, in the power transmission device for a clutchless compressor according to any one of the first to third aspects, the rotating shaft side rotating body and the friction material holding plate are meshed with each other. It is characterized by the following.

Since the rotating shaft side rotating body and the friction material holding plate are engaged with each other, the frictional force between the rotating shaft side rotating body and the friction material holding plate is increased.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a power transmission device for a clutchless compressor according to an embodiment of the present invention, and FIG.
3 is an exploded perspective view of the power transmission device of the clutchless compressor of FIG.

The power transmission device of this clutchless compressor includes a pulley 10, a hub (rotary rotating body) 20, a holder plate 30, a friction material mounting plate 40, a damper holding plate 50, and a fall prevention plate for the damper plate. A plate (restriction member) 70.

The pulley 10 is rotatably supported by a boss 1a of the compressor housing 1 via a radial bearing 5, and is rotated about a rotating shaft 2 by a rotational force from an engine (external drive source) (not shown). .

The hub 20 is fixed to an end of the rotating shaft 2 protruding from the compressor housing 1 by a bolt 6 and a damper plate falling-off prevention plate 70 also serving as a washer.

The hub 20 includes a flange portion 21 and a cylindrical portion 23.
It is composed of

A plurality of ridges 22 are formed on the front end face of the flange portion 21 at regular intervals along the circumferential direction.

A male screw 23a is formed on the outer peripheral surface of the cylindrical portion 23.

An annular holder plate 30 is attached to the pulley 10 fixed to the outer ring 5a of the radial bearing 5 by a rivet 3.
5 fixed. The pulley in the claims is a concept including the pulley 10 and the holder plate 30.

The inner ring 5b of the radial bearing 5 is fixed to the boss 1a of the housing 1.

A flange portion 31 is formed on the outer peripheral edge of the holder plate 30 so as to protrude toward the front side (left side in FIG. 1).

In the flange portion 31, arcuate concave portions 32 projecting outward in the radial direction and substantially triangular concave portions 33 projecting outward in the radial direction are formed alternately at intervals of 60 ° in the circumferential direction. I have.

An opening 36 for letting out the hub 20 is formed in the center of the holder plate 30.

A belt (not shown) is wound around the outer peripheral surface of the pulley 10, and the pulley 10 is connected to the crankshaft of the engine (not shown) via the belt.

A disk-shaped damper rubber (elastic member) 60 is fixed to the damper holding plate 50 by rivets 53 at 120 ° intervals in the circumferential direction. The rivet 53 is fixed to the center hole 61 of the damper rubber 60, and one end of the rivet 53 is caulked to a hole 53 a formed in the damper holding plate 50.

A center hole 55 is provided at the center of the damper holding plate 50.

The substantially triangular friction material mounting plate 40 is disposed between the damper holding plate 50 and the hub 20. The friction material mounting plate 40 is integrally connected to the damper holding plate 50 by rivets 51.

That is, the hole 51a of the damper holding plate 50 and the friction material mounting plate 40
The two plates 40 and 50 are connected by caulking both ends of the rivet 51 inserted into the hole 51b.

The friction material mounting plate 40 has a center hole 45 for allowing the cylindrical portion 23 of the hub 20 to escape.

Further, an annular groove 41 having a center hole 45 as a center is formed in the friction material mounting plate 40, and a friction material 42 is attached to the annular groove 41 with an adhesive. As the friction material 42, a fading material, copper, resin, or the like used for a brake shoe is used.

The friction member 42 is axially engaged with the ridge 22 of the flange 21 of the hub 20.

A female screw 46 is formed on the inner peripheral surface of the center hole 45 of the friction material mounting plate 40.
Male screw 2 formed on the outer peripheral surface on the front side of the cylindrical portion 23
3a. The female screw 46 and the male screw 23a constitute a blocking means.

The pressing force of the friction material 42 against the flange 21 of the hub 20 is determined by the amount of screwing of the friction material mounting plate 40 into the cylindrical portion 23 of the hub 20.

When an excessive load is applied to the compressor, the friction material mounting plate 40 rotates in a direction away from the male screw 23a of the cylindrical portion 23.

When the load torque on the compressor side is within a predetermined value, the rotational force of the pulley 10 is applied to the power transmission path (damper rubber 60, damper holding plate 50, friction material mounting plate 4).
0, the friction material 42 and the hub 20) are transmitted to the rotating shaft 2, and the rotating shaft 2 rotates.

Since the damper rubber 60 is elastically deformed by the flange portion 31 of the holder plate 30, the fluctuation of the load torque on the compressor side is reduced by the damper rubber 60.

When the load torque on the compressor side exceeds a predetermined value, the damper holding plate 50 rotates with respect to the hub 20 against the engagement between the friction material 42 and the hub 20. At the same time, the friction material mounting plate 40 on which the female screw 46 is formed
Also rotates, and the friction material mounting plate 40 moves to the left.

As a result, the meshing state between the friction material 42 and the hub 20 is released, the transmission of the driving force from the pulley 10 to the rotary shaft 2 is cut off, and the friction material mounting plate 40
Is moved to the left by a predetermined amount, the screwed portion 23a comes off, and the pulley 10 idles while the damper rubber 60 is held by the holder plate 30.

According to the power transmission system for a clutchless compressor of this embodiment, the following effects can be obtained.

The friction material 42 is pressed against the flange 21 of the hub 20 to transmit the driving force from the pulley, and the friction material mounting plate 40 is loosened to interrupt the transmission of the driving force. Of the transmission force can be prevented from being varied due to the difference in the transmission force.

When the friction material mounting plate 40 is loosened, the friction material 42 is immediately separated from the hub 20, so that the transmission of the driving force from the pulley 10 to the rotary shaft 2 is cut off at an optimal timing. It is possible to prevent the belt from being cut due to the load, and when the ambient temperature is high, the power transmission path is not interrupted before reaching an excessive torque at which the power transmission should be interrupted.

In the prior art (see Japanese Patent Application Laid-Open No. 9-4564), torque is detected by using deformation of an elastic body (rubber). However, since the hardness of rubber changes with temperature, The timing of interrupting the transmission force changes greatly.

Since the friction material 42 is fixed to the friction material holding plate 40, after the transmission of the driving force from the pulley 10 to the rotary shaft 2 is cut off, the friction material 42 does not scatter outside or fall. .

When the friction material mounting plate 40 comes off, the movement of the friction material holding plate 40 and the damper holding plate 50 toward the front side by a predetermined amount or more is regulated by the damper plate falling prevention plate 70, and the friction material holding plate 40 and the damper holding plate 50 fall off the rotary shaft 2. Is prevented.

Since no axial load is applied to the radial bearing 5, the durability of the radial bearing 5 is improved.

In the above embodiment, the ridge 22 is formed on the flange 21 of the hub 20, but the ridge may be formed on both the flange 21 and the friction material mounting plate 40. In addition, the ridges 22 need not always be formed.

[0057]

As described above, according to the power transmission system for a clutchless compressor according to the first aspect of the present invention, the torque is detected by the friction between the friction material (the friction material mounting plate) and the rotating body on the rotating shaft side. Therefore, the influence of the use environment upon torque detection can be reduced. Further, since the elastic member is elastically deformed, the fluctuation of the load torque on the compressor side is reduced by the elastic member. Further, since the friction material is fixed to the friction material mounting plate, it is possible to prevent the friction material from scattering or falling outside. Furthermore, since the engagement between the friction material and the rotating shaft side rotating body is immediately disengaged, the transmission of the driving force from the pulley to the rotating shaft is cut off at an optimal timing, thereby preventing the belt from being cut due to overload. it can. Further, since no axial load is applied to the radial bearing, the durability of the radial bearing can be improved.

According to the power transmission device for a clutchless compressor according to the second aspect of the present invention, when the load torque on the compressor side exceeds a predetermined value due to an abnormality in the compressor, the connection between the pulley and the rotary shaft is reduced. Power transmission is properly shut off.

According to the power transmission device of the clutchless compressor of the third aspect, the movement of the damper holding plate and the friction material holding plate in the axial direction is regulated by the regulating member, so that the damper retaining plate and the friction material retaining plate are prevented from falling off the rotary shaft. You.

According to the power transmission device for a clutchless compressor of the fourth aspect, the frictional force between the rotating shaft side rotating body and the friction material holding plate is increased, and higher torque can be detected. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a power transmission device for a clutchless compressor according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is an exploded perspective view of a power transmission device of the clutchless compressor of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Rotary shaft 10 Pulley 20 Hub (rotary shaft side rotating body) 23a Male screw 40 Friction material holding plate 42 Friction material 46 Female screw 50 Damper holding plate 60 Damper rubber (elastic member) 70 Damper plate falling prevention plate (Regulator)

Claims (4)

[Claims] 1. An external drive source via a friction material provided between a pulley rotatably mounted on a housing and a rotating shaft side rotating body integrally provided on a rotating shaft protruding from the housing to the outside. A power transmission device for a clutchless compressor that transmits the driving force to the rotary shaft, a damper holding plate axially facing the rotary shaft side rotating body, and a damper holding plate fixed to the damper holding plate, and the rotary shaft side rotation. A friction material holding plate for holding the friction material in contact with a body, interposed between the pulley and the damper holding plate,
An elastic member that absorbs fluctuations in load torque, and when the load torque is greater than or equal to a predetermined value and the damper holding plate rotates against a frictional force between the friction material and the rotating shaft side rotating body, A power transmission device for a clutchless compressor, comprising: a cut-off means for moving a friction material holding plate in an axial direction of the rotary shaft to cut off power transmission between the pulley and the rotary shaft. . 2. The method according to claim 1, wherein the blocking means comprises a male screw formed on the rotary shaft-side rotating body and a female screw formed on the friction material holding plate and screwed with the male screw. A power transmission device for a clutchless compressor according to claim 1. 3. The power transmission device for a clutchless compressor according to claim 1, wherein a regulating member that regulates an amount of movement of the friction material holding plate is provided on the rotating shaft. 4. The power transmission device for a clutchless compressor according to claim 1, wherein the rotating shaft side rotating body and the friction material holding plate are engaged with each other.