JP2000161383A - Power transmission device - Google Patents

Abstract

(57) [Problem] To reduce the axial dimension of a power transmission device. SOLUTION: A pulley 1 is rotatably supported by a cylindrical protrusion A of the compressor. Also, the hub assembly 3
It is mounted on the rotary shaft B of the compressor. The holding member 5 of the hub assembly 3 has a plurality of mounting holes 5a and a plurality of relief holes 5b.
Are formed. The elastic member 6 is fixed to the holding member 5 by press-fitting the flanged projection 6a into each mounting hole 5a. The elastic member 6 has a plurality of recesses 6.
The pulley 1 and the hub assembly 3 are connected by fitting the concave portion 6b with the convex portion 1f of the pulley 1. When the rotation shaft B is locked, the convex portion 1f of the pulley 1
As a result, the convex portion 6c of the elastic member 6 is elastically deformed into the relief hole 5b of the holding member 5 while climbing over the concave portion 6b of the elastic member 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device constituting a torque limiter mechanism when an overload occurs.

[0002]

2. Description of the Related Art A conventional power transmission device is disclosed in
The one proposed in Japanese Patent Application No. 292003 is representative. The power transmission device disclosed in the publication includes a driving-side rotating member mounted on a front housing of a continuously variable displacement type compressor and a driven-side rotating member mounted on a rotating shaft of the compressor. The structure is such that the member and the driven-side rotating member are integrally rotatably connected by an elastic member made of rubber material.

A driving-side rotating member of a power transmission device is a bearing fitted to a cylindrical projection formed integrally with a front housing of a compressor and prevented from falling off by a snap ring. An outer ring of the bearing is fitted to an inner peripheral surface. A cylindrical rotor fitted and retained, an inner cylindrical portion fitted and welded to the outer peripheral surface of the rotor, a disk portion extending radially outward from one end of the inner cylindrical portion, and a disk portion Has an outer cylindrical portion extending from the outer peripheral end to the front housing side and having an outer peripheral surface formed in a pulley groove, and is provided as a pulley having an annular groove opened to the front housing side.

An inner holding member is fixed to the disk portion of the pulley by rivets. The inner holding member has a wavy cylindrical portion in which arc-shaped convex portions and arc-shaped concave portions are alternately formed in the circumferential direction, and extends radially outward from one end of the cylindrical portion and a pulley. An outer bent portion having the rivet insertion hole formed therein and an inner bent portion extending radially inward from the other end of the cylindrical portion are provided on the mounting portion bulging toward the disk portion side.

The driven-side rotating member of the power transmission device includes a hub spline-fitted to the shaft end of the compressor and fixed by bolts, and an outer holding member fixed to the hub by rivets. The outer holding member is placed on the outer side in the radial direction of the cylindrical portion of the inner holding member, and a wavy cylindrical portion in which arc-shaped convex portions and arc-shaped concave portions are alternately formed in the circumferential direction. An outer bent portion extending radially outward from one end, and extending radially inward from the other end of the cylindrical portion, overlapped with the hub flange portion and fixed with rivets, and the hub flange portion. A reinforcing rib provided at a portion axially opposed to the inner bent portion of the inner holding member, and a portion separated from the pulley similarly to the rib at a portion axially opposed to the outer bent portion of the inner holding member in the axial direction. There is provided an inner bent portion integrally formed with the bulging escape portion.

[0006] An elastic member made of a rubber material, which connects these members so as to be integrally rotatable, is press-fitted between the outer holding member and the inner holding member. The elastic member is
An annular torque fluctuation absorbing portion formed in a wavy shape similar to the outer peripheral surface of the cylindrical portion of the inner holding member and press-fitted to the outer peripheral surface of the cylindrical portion, and the same as the inner peripheral surface of the cylindrical portion of the outer holding member. It has a wavy shape and is press-fitted into the inner peripheral surface of the cylindrical portion. In the circumferential direction, a concave portion is formed on one of the convex portions, and a concave escape groove is formed on the other of the convex portions. A torque actuating portion is provided.

In such a power transmission device, a relief groove is designed in the torque operation portion so that the torque operation portion (convex portion) of the elastic member is easily elastically deformed, and the elastic member is locked when the rotating shaft of the compressor is locked. Is elastically deformed so as to fill the space formed between the escape groove of the elastic member and the cylindrical portion of the outer holding member, so that power transmission from the engine to the compressor is shut off.

[0008]

The conventional power transmission device has a structure in which a torque limiter operating portion is provided on the outer peripheral surface of an elastic member, and the operating portion is elastically deformed to interrupt the transmission of power. The axial dimension of the power transmission device becomes long because the elastic member is incorporated. SUMMARY OF THE INVENTION It is an object of the present invention to reduce an axial dimension of a power transmission device by providing a torque limiter operating portion on a side surface of an elastic member.

[0009]

According to a first aspect of the present invention, there is provided a power transmission device rotatably supported by a bearing on a cylindrical projection of a driven device. An inner cylindrical portion in which the bearing is fitted on the inner peripheral surface, an outer cylindrical portion provided with a pulley groove on the outer peripheral surface, a disk portion connecting the inner cylindrical portion and the outer cylindrical portion, and a circumferential direction. A pulley provided with a plurality of protrusions integrally formed on the disc portion at an interval and protruding in the axial direction, and a holding member mounted on a rotation shaft of the driven device protruding from the cylindrical protrusion. An elastic member fixed to the holding member and having a plurality of concave portions formed on a side surface and engaged with the convex portion of the pulley is provided.

According to a second aspect of the present invention, there is provided a power transmission device according to the first aspect, wherein the holding member has a clearance hole formed in the elastic member that penetrates in an axial direction in a circumferential direction. A plurality of convex portions aligned with the relief holes and a plurality of concave portions aligned between the adjacent relief holes are formed on a side surface of the elastic member, and the convex portion of the pulley is formed. When the vehicle rides on the concave portion of the elastic member, the convex portion of the elastic member is elastically deformed into the relief hole of the holding member.

According to a third aspect of the present invention, there is provided the power transmission device according to the first aspect, wherein the elastic member has a plurality of concave portions which are engaged with the convex portions of the pulley. And an escape portion is formed in a portion between the adjacent concave portions.

According to a fourth aspect of the present invention, in the power transmission device according to the first to third aspects, a plurality of mounting holes are provided in the holding member at circumferential intervals. The elastic member is formed with a plurality of flanged projections press-fitted into the mounting holes.

According to a fifth aspect of the present invention, in the power transmission device according to the first to third aspects, the elastic member is fixed to the holding member.

[0014]

FIG. 1 shows an embodiment of the present invention.
2 and FIG. 2 show a power transmission device. 1 is a partially cutaway plan view, and FIG. 2 is a sectional view of FIG. The power transmission device shown in these drawings is mounted on a compressor of a continuously variable displacement type, and is integrated with a pulley 1 rotatably supported by a bearing 2 on a cylindrical projection A of the compressor and a rotating shaft B of the compressor. And an elastic member 6 connecting the pulley 1 and the hub assembly 3 to each other.

The pulley 1 is a pulley 1 made of a synthetic resin material in which a bearing 2 is integrally joined to an inner peripheral surface by injection molding of a synthetic resin material. An outer ring of the bearing 2 is integrally joined to an inner peripheral surface. An annular member provided with an inner cylindrical portion 1a, an outer cylindrical member 1b having a pulley groove formed on the outer peripheral surface, and a disk portion 1c connecting the ends of the inner cylindrical portion 1a and the outer cylindrical portion 1b. Have been. A plurality of ribs connected to the outer peripheral surface of the inner cylindrical member 1a, the inner peripheral surface of the outer cylindrical portion 1b, and the inner surface of the disk portion 1c, and provided in an annular groove 1d opened on the front housing side of the compressor. 1e is formed integrally. Further, the disk portion 1c is formed with a plurality of projections 1f projecting from the outer surface thereof toward the shaft end of the rotation shaft B and provided at intervals in the circumferential direction.
The synthetic resin pulley 1 having such a shape is used.
Is rotatably supported by the cylindrical projection A by fitting the bearing 2 into the cylindrical projection A and preventing the bearing 2 from falling off with a snap ring.

The hub assembly 3 is provided with a hub 4 spline-fitted to the rotating shaft B, and a disc-shaped holding member 5 fixed to the flange 4a of the hub 4 with a plurality of rivets. Further, the bolt inserted from the center hole of the holding member 5 is screwed into the screw hole of the rotation shaft B while the center portion of the holding member 5 is in contact with the end face of the rotation shaft B, so that the hub assembly 3 rotates. It is mounted integrally on the shaft B.

The holding member 5 is formed in a disk shape by press-punching a sheet metal, and a pulley 1 is formed from a radially inner portion superposed on the flange portion 4 a of the hub 4.
The portion on the radially outer side facing the disk portion 1c in the axial direction is extruded toward the pulley 1 side. A plurality of through holes into which the above-mentioned rivets are inserted are formed in a radially inner portion, and a plurality of mounting holes 5a for fixing an elastic member 6 to be described later are formed in the radially outer portion. A plurality of relief holes 5b provided between the mounting holes 5a are formed. The escape hole 5b of the embodiment is a substantially U-shaped cutout groove.

The elastic member 6 is an annular member made of a rubber material having a predetermined thickness, and has one side surface (fixed surface) having a plurality of flanged projections press-fitted into the mounting holes 5a of the holding member 5. 6a are integrally formed. On the other side surface (engagement surface), a plurality of concave portions 6b into which the convex portions 1f of the pulley 1 are fitted are formed, and the convex portions 6c are formed between the concave portions 6b. Further, the flanged protrusion 6a and the concave portion 6b are provided at the same position on the circumference, and a part of the side surface (fixed surface) of the convex portion 6c is aligned with the relief hole 5b of the holding member 5.

In the power transmission device having the above-described structure, a belt is hung on the pulley groove of the pulley 1 to transmit the power of the automobile engine, so that the rotating shaft B rotates to drive the compressor. When the rotating shaft B of the compressor is locked, the convex portion 1f of the pulley 1 rides on the convex portion 6c from the concave portion 6b of the elastic member 6, and the convex portion 6c of the elastic member 6 is held by the holding member 5 by the convex portion 1f of the pulley 1. , The transmission of power to the rotating shaft B is intermittent. Further, the projection 6c of the elastic member 6 is broken by such intermittent transmission of power, so that transmission of power to the rotating shaft B is completely shut off.

In this embodiment, the pulley 1 made of a synthetic resin material in which the bearing 2 is inserted is exemplified. However, a sheet metal pulley that is pressed or a general steel material that is formed by rolling a pulley groove on the outer peripheral surface is used. It may be a pulley. Although the hub assembly 3 has been illustrated, a structure in which the flange 4 a of the hub 4 is the holding member 5 may be used. Further, although a continuously variable displacement type compressor has been exemplified as the driven device, another driven device may be used.

Next, another power transmission device will be described as an embodiment of the present invention. 3 is a partially cutaway plan view, FIG. 4 is a sectional view of FIG. 3, and FIG. 5 is a side view of a main part of FIG. The power transmission devices of these drawings are different from the power transmission devices in that the holding member has no relief hole and the elastic member has a relief portion. Therefore, the same reference numerals are used for the same members in the drawings, and duplicate detailed description is omitted.

That is, in the illustrated power transmission device, the hub assembly 7 mounted on the rotary shaft B of the compressor is connected to the hub 4 spline-fitted to the rotary shaft B and the flange 4a of the hub 4. Disc-shaped holding member 8 fixed with a plurality of rivets
Is provided at the radially outer portion of the holding member 8 that faces the disk portion 1c of the pulley 1 in the axial direction, and the above-described relief hole (5b) is not formed. In order to allow the convex portion (6c) to be elastically deformed when the convex portion (1f) of the pulley (1) rides on the convex portion (6c) from the concave portion (6b) of the elastic member (6), the elastic member 9 has a clearance. A portion 9d is formed. Escape portion 9d exemplified as an embodiment
Is formed by forming a through hole penetrating from the inside in the radial direction to the outside. Such a relief 9d is
The elastic member 9 may be provided by a concave cutout groove that is depressed with respect to the side surface (either the fixed surface or the engagement surface). The structure in which the elastic member 9 is provided with the flanged protrusion 9a and the elastic member 9 is fixed to the holding member 8 by press-fitting the flanged protrusion 9a into the mounting hole 8a of the holding member 8 is described below. This is the same as the power transmission device described above.

The power transmission device having such a structure is as follows.
Similarly to the power transmission device described above, the power of the vehicle engine is transmitted to the rotary shaft B of the compressor. When the rotation shaft B of the compressor is locked, the protrusion 1f of the pulley 1 is
From the concave portion 9b to the convex portion 9c. Elastic member 9
The convex portion 9c is elastically deformed because the escape portion 9d is formed. Accordingly, the transmission of power to the rotating shaft B is interrupted and the projection 9c of the elastic member 9 is broken by the interrupted transmission of power, so that the transmission of power to the rotating shaft B is completely shut off. .

Next, still another embodiment will be described. FIG.
FIG. 7 is a partially cutaway plan view, and FIG. 7 is a sectional view of FIG. The power transmission devices shown in these drawings differ from each other in the structure in which the elastic member is fixed to the holding member, and the pulley 1 is the same as the power transmission device described above. Therefore, the same reference numerals are used for the same members to omit redundant detailed description.

That is, the illustrated hub assembly 10 of the power transmission device includes a hub 4 spline-fitted to the rotating shaft B of the compressor, and a holding member fixed to the flange portion 4a of the hub 4 by a plurality of rivets. An elastic member 12 fixed to the holding member 11 is provided. The holding member 11
A radially inner portion superimposed on the flange portion 4a of the hub 4 and a radially outer portion pushed toward the disk portion 1c of the pulley 1 are provided, and a bolt insertion hole and a rivet insertion hole are formed in the radially inner portion. Relief hole 11a of elastic member 12
And a cylindrical portion 11b bent from the outer peripheral surface toward the pulley 1 is integrally formed.

The elastic member 12 is provided at intervals in the circumferential direction and has a concave portion 12 into which the convex portion 1f of the pulley 1 is fitted.
a, a convex portion 12b provided by forming the concave portion 12a, and a protruding portion 12c protruding into the escape hole 11a of the holding member 11. After the elastic member 12 having such a shape is set in a mold by applying an adhesive to the bonding surface of the holding member 11, the rubber is filled in the mold and heated to bond the rubber and the holding member 11, and It is formed by molding.

The power transmission device having such a structure is as follows.
Similarly to the power transmission device described above, the power of the vehicle engine is transmitted to the rotary shaft B of the compressor. When the rotation axis B of the compressor is locked, the protrusion 1f of the pulley 1 is
The second concave portion 12a rides on the convex portion 12b. The convex portion 12b of the elastic member 12 is provided with a relief hole 11a of the holding member 11.
Elastically deform from outside. Therefore, the transmission of power to the rotating shaft B is interrupted, and the projection 12b of the elastic member 12 is broken by the interrupted transmission of power, so that the transmission of power to the rotating shaft B is completely shut off. .

[0028]

According to the power transmission device of the present invention, an inner cylindrical portion, which is rotatably supported by a cylindrical projecting portion of a driven device by a bearing, and the bearing is fitted to an inner peripheral surface,
An outer cylindrical portion provided with a pulley groove on an outer peripheral surface, a disk portion connecting the inner cylindrical portion and the outer cylindrical portion, and an axial direction formed integrally with the disk portion at a circumferential interval. A pulley provided with a plurality of protrusions protruding from the cylindrical protrusion, a holding member mounted on a rotating shaft of the driven device protruding from the cylindrical protrusion, and a protrusion of the pulley fixed to the holding member and A conventional power transmission provided with a structure in which the outer peripheral surface of the elastic member is engaged with the inner peripheral surface of the holding member is provided because the elastic member has a plurality of concave portions formed on the side surfaces thereof. The dimension in the axial direction can be shortened as compared with the device. Therefore, it is effective when the space for incorporating the driven device is small.

In the power transmission device of the present invention, the holding member is formed with an escape hole of an elastic member penetrating in the axial direction at intervals in a circumferential direction, and is aligned with the escape hole on a side surface of the elastic member. Are formed between the plurality of convex portions and the adjacent relief holes, and when the convex portion of the pulley rides over the concave portion of the elastic member, the convex portion of the elastic member is elastically inserted into the relief hole of the holding member. Because it is deformed, the shapes of the elastic member and the holding member are simplified, and the manufacture thereof is easy.

Further, in the power transmission device of the present invention, the elastic member has a plurality of concave portions formed on the side surface to be engaged with the convex portions of the pulley, and a relief portion is formed between the adjacent concave portions. With this structure, the shapes of the elastic member and the holding member are simplified, and the manufacturing thereof is easy.

In the power transmission device according to the present invention, the holding member has a plurality of mounting holes formed at intervals in the circumferential direction, and the elastic member has a plurality of flanges press-fitted into the mounting holes. Because it was made to have a structure with protrusions
The elastic member can be easily fixed to the holding member.

The power transmission device of the present invention has a structure in which the elastic member is fixed to the holding member, so that the assembly of the device is simplified.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of a power transmission device shown as an embodiment of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a partially broken plan view of the power transmission device shown as the embodiment of the present invention.

FIG. 4 is a sectional view of FIG. 3;

FIG. 5 is a side view of a main part of FIG.

FIG. 6 is a partially cutaway plan view of the power transmission device shown as the embodiment of the present invention.

FIG. 7 is a sectional view of FIG. 6;

[Explanation of symbols]

 1 Pulley 2 Bearing 3 Hub Assembly 4 Hub 5 Holding Member 6 Elastic Member 7 Hub Assembly 8 Holding Member 9 Elastic Member 10 Hub Assembly 11 Holding Member 12 Elastic Member

Claims (5)

[Claims] 1. An inner cylindrical portion in which a bearing is rotatably supported by a cylindrical protruding portion of a driven side device by a bearing, and wherein the bearing is fitted on an inner peripheral surface, and an outer pulley groove provided on an outer peripheral surface. A cylindrical portion, a disk portion connecting the inner cylindrical portion and the outer cylindrical portion, and a plurality of convex portions formed integrally with the disk portion at an interval in the circumferential direction and projecting in the axial direction. A pulley, a holding member mounted on the rotating shaft of the driven device protruding from the cylindrical protrusion, and a plurality of recesses fixed to the holding member and engaged with the protrusion of the pulley. A power transmission device provided with an elastic member formed in the power transmission device. 2. The power transmission device according to claim 1, wherein the holding member is formed with an escape hole of the elastic member penetrating in an axial direction at intervals in a circumferential direction, and a side surface of the elastic member. A plurality of protrusions aligned with the relief hole and a plurality of recesses positioned between the adjacent relief holes are formed, and when the protrusion of the pulley rides over the recess of the elastic member, A power transmission device, wherein the convex portion of the elastic member is elastically deformed into the relief hole of the holding member. 3. The power transmission device according to claim 1, wherein the elastic member has a plurality of concave portions formed on a side surface of the elastic member, the concave portions being engaged with the convex portions of the pulley, and the adjacent concave portions. A power transmission device, wherein an escape portion is formed in a portion between the power transmission devices. 4. The power transmission device according to claim 1, wherein the holding member has a plurality of mounting holes formed at intervals in a circumferential direction, and the elastic member has a plurality of mounting holes. A power transmission device, wherein a plurality of flanged projections press-fitted into the mounting holes are formed. 5. The power transmission device according to claim 1, wherein the elastic member is fixed to the holding member.