JP2000179568A - Power transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the overall length of a compressor mounted with a power transmission and to easily disengage the transmission of the power. SOLUTION: A pulley 1 with an annular groove 1d formed therein is rotatably supported by a cylindrical projecting part A of a compressor. A hub assembly 4 is mounted on a rotary shaft B of the compressor. A cylindrical part 3c of a drive side connection member 3 fixed to a disk part 1c and a cylindrical part 6a of a driven side connection member 6 fixed to a hub 5 are fitted in the annular groove 1d of the pulley 1 in a non-contact manner. A plurality of engagement grooves 3b, 6b are formed in the cylindrical parts 3c, 6a, and rubber or plastic coupling members 8 are individually fitted to the engagement grooves 3b, 6b to integratedly engage the pulley 1 with the hub assembly 4.

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 capable of interrupting transmission of power 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, and 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 A pulley having 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 having an annular groove opened to the front housing side is provided.

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]

A conventional power transmission device has a structure in which an inner holding member of a driving-side rotating member projects in an axial direction from a cylindrical projection of a compressor, and a radial direction of a hub of a driven-side rotating member. Since the elastic member is provided on the outside, the overall length of the compressor to which the power transmission device is mounted becomes long. Further, the conventional power transmission device has a structure in which transmission of power is interrupted by elastic deformation of the elastic member. After the rotation shaft of the compressor is locked, the drive side rotation is performed until the torque operation portion of the elastic member is broken. The member will continue to rotate intermittently. Therefore, other driven devices to which power is transmitted by the belt hung on the driving rotating member are adversely affected.

An object of the present invention is to reduce the overall length of a driven device on which a power transmission device is mounted. Another object of the present invention is to provide a power transmission device capable of easily interrupting transmission of power when an overload occurs.

[0010]

In order to achieve the above object, a power transmission device described in claim 1 is rotatably supported by a bearing on a cylindrical projection formed on a housing of a driven device. A driving-side rotating member, a driven-side rotating member mounted on a rotating shaft of the driven-side device protruding from the cylindrical protrusion, and a coupling member that couples the driving-side rotating member and the driven-side rotating member. In the power transmission device, an inner cylindrical portion in which the bearing is fitted on the inner peripheral surface, an outer cylindrical portion having a pulley groove formed on the outer peripheral surface, and a disk portion connecting the inner cylindrical portion and the outer cylindrical portion Is provided, the drive-side rotating member provided with an annular groove opened in the protruding direction of the rotating shaft, a drive-side connecting member provided in the annular groove and rotating integrally with the drive-side rotating member, Inserted into the annular groove The driven-side rotating member provided with a driven-side connecting member superimposed on the driving-side connecting member in a non-contact state, and the driving-side connecting member and the driven-side connecting member are coupled in the annular groove. A coupling member 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 plurality of engagement grooves are formed at intervals in a circumferential direction. And a second cylindrical portion of the driven-side connecting member in which a plurality of engagement grooves are formed at intervals in a circumferential direction. The first cylindrical portion and the second cylindrical portion are While being overlapped in a non-contact state in the annular groove,
The drive side rotation member and the driven side rotation member are connected by fitting the coupling member into an engagement portion formed by the engagement groove of the first cylindrical portion and the engagement groove of the second cylindrical portion. It is characterized by the following.

According to a third aspect of the present invention, in the power transmission device according to the second aspect, the coupling member includes one of the first cylindrical portion and the second cylindrical portion. An outer annular portion into which the cylindrical portion is fitted and an inner annular portion into which the other cylindrical portion is fitted, and a connecting portion connecting these outer annular portion and the inner annular portion are provided. The peripheral wall portion and the inner peripheral wall portion, and a plurality of connecting walls which connect the outer peripheral wall portion and the inner peripheral wall portion and are provided at intervals in the circumferential direction and are fitted in the engagement grooves are provided. Features.

[0013]

FIG. 1 shows an embodiment of the present invention.
And a power transmission device shown in FIG. 2 which is mounted on a vehicle air-conditioning compressor (continuously variable displacement type compressor) as a driven device and transmits power of a vehicle engine as a driving device to the compressor. FIG. 1 is a partially cutaway plan view, and FIG. 2 is a cross-sectional view. The power transmission device shown in these drawings includes a pulley 1 as a drive-side rotating member rotatably supported by a cylindrical projection A of a compressor.
And a hub assembly 4 as a driven-side rotating member mounted on the rotating shaft B of the compressor, and a coupling member 8 that breaks when the load on the rotating shaft B increases.

The pulley 1 has an inner cylindrical portion 1a in which a bearing 2 is fitted and fixed on an inner peripheral surface, an outer cylindrical portion 1b having a pulley groove formed on an outer peripheral surface, and end portions of these cylindrical portions 1a, 1b. Are provided, and an annular groove 1d that opens in the direction in which the rotation axis B protrudes is formed. In addition, annular groove 1
The drive side connecting member 3 is provided in d. The drive-side connecting member 3 includes an outward flange portion 3a fixed to the disk portion 1c of the pulley 1, and a cylindrical portion 3c (first portion) having an engagement groove 3b formed at a position dividing the circumferential direction into six equal parts. Cylindrical part) is formed.

The hub assembly 4 is provided with a hub 5 spline-fitted to the rotating shaft B, and a driven side connecting member 6 fixed to the flange portion 5a of the hub 5 with a plurality of rivets. Further, the bolt 7 is screwed into the screw hole of the rotating shaft B while the side surface of the driven side connecting member 6 is in contact with the end face of the rotating shaft B, so that the hub assembly 4 is integrally mounted on the rotating shaft B. I have.

The driven-side connecting member 6 has a stepped cylindrical portion formed therein, and a large-diameter cylindrical portion 6a (second cylindrical portion) on the opening side is inserted into the annular groove 1d of the pulley 1. This cylindrical part 6
In a, an engagement groove 6b is formed at a position obtained by dividing the circumferential direction into six equal parts. The cylindrical portion 6a is fitted to the outside of the cylindrical portion 3c of the driven side connecting member 3, and has a structure in which the cylindrical portion 3c and the cylindrical portion 6a are overlapped in a non-contact state in the radial direction.

A radial through portion (engaging portion) formed by aligning the engaging groove 3b of the cylindrical portion 3c with the engaging groove 6b of the cylindrical portion 6a is formed of rubber, plastic, or the like. The connecting members 8 are individually fitted. The coupling member 8 is a member having a substantially H-shaped cross section, and includes a rupturable portion 8a fitted into the engaging groove 3b of the cylindrical portion 3c and the engaging groove 6b of the cylindrical portion 6a, and both ends of the rupturable portion 8a. Is provided with a flange portion 8b integrally formed with the rim portion.

A power transmission device having such a structure is as follows.
When the pulley 1 rotates by the power of the automobile engine, the rotation shaft B also rotates integrally via the coupling member 8, so that the compressor can be driven. When the rotation shaft B is locked, the coupling members 8 break, and the transmission of power to the rotation shaft B is interrupted. Although the above-described power transmission device described as the embodiment has a structure in which a plurality of coupling members 8 are divided and arranged in the circumferential direction, the driving-side coupling member 3 is formed by the annular coupling member 8 as the annular flange 8b. And the driven side connecting member 6 may be connected. Further, the cylindrical portion 6a of the driven side connecting member 6 may be fitted inside the cylindrical portion 3c of the driving side connecting member 3.

Next, a power transmission device shown in FIGS. 3 and 4 will be described as another embodiment. FIG. 3 is a sectional view of the power transmission device, and FIG. 4 is a plan view of the coupling member of FIG. The power transmission devices shown in these drawings differ from the power transmission devices described above in the shape of the coupling member and the outer diameters of the cylindrical portion of the driving-side connecting member and the cylindrical portion of the driven-side connecting member. In the drawings, the same reference numerals have been used for members other than the coupling member, and a detailed description thereof will not be repeated.

That is, the coupling member 9 of the power transmission device shown as another embodiment includes an inner annular portion 10 into which the cylindrical portion 3c of the driving side coupling member 3 is fitted, and a driven side coupling member 6
The outer annular portion 11 into which the cylindrical portion 6a is fitted, and a plurality of connections in which the outer peripheral surface of the inner annular portion 10 and the inner peripheral surface of the outer annular portion 11 are integrally joined at a position dividing the circumferential direction into six equal parts. A part 12 is provided. Also, an inner annular portion 10 and an outer annular portion 11
Have inner peripheral wall portions 10a, 11a and outer peripheral wall portions 10b,
11b, the inner peripheral wall portions 10a, 11a and the outer peripheral wall portion 10
The connecting walls 10c and 11c connecting the b and 11b are provided. The thickness of the connecting portion 12 is determined by the connecting walls 10c, 11
The connecting portion 12 is formed to be thinner than the wall thickness of the connecting portion 12c, and the connecting portion 12 is broken when an overload occurs on the rotating shaft B.

In the power transmission device provided with such a coupling member 9, the inner annular portion 10 of the coupling member 9 is fitted to the cylindrical portion 3c of the driving side coupling member 3 while the connecting wall 10c is fitted in the engagement groove 3b. The pulley 1 and the hub assembly 4 are fitted by fitting the cylindrical portion 6a of the driven-side connecting member 6 to the outer annular portion 11 of the connecting member 9 while fitting the connecting wall 11c into the engaging groove 6b. Are joined together. In addition, the power transmission device having such a structure, like the power transmission device described above,
When the pulley 1 rotates by the power of the automobile engine, the rotation shaft B also rotates integrally via the coupling member 9, so that the compressor can be driven. When the rotating shaft B is locked, the connecting portions 12 of the connecting member 9 are broken, and the transmission of power to the rotating shaft B is interrupted.

The connecting member 9 of the power transmission device shown as another embodiment has a plurality of connecting portions 12 provided at intervals in the circumferential direction.
An annular connecting portion that is more easily broken than 0c and 11c may be formed.

[0023]

As described above, according to the power transmission device of the present invention, the inner cylindrical portion with the bearing fitted on the inner peripheral surface, the outer cylindrical portion with the pulley groove formed on the outer peripheral surface, and the inner cylindrical portion A drive-side rotating member provided with a circular disk portion connecting the outer cylindrical portion and an outer cylindrical portion, and an annular groove formed in a direction in which the rotation axis of the driven-side device projects, and the drive side provided in the annular groove. A driving-side connecting member that rotates integrally with the rotating member; and a driven-side connecting member that is inserted into the annular groove and overlaps the driving-side connecting member in a non-contact state, and is mounted on a rotation shaft of the driven-side device. And a coupling member in which the driven-side coupling member and the driven-side coupling member are coupled in the annular groove, and the coupling member is provided when an overload occurs on the rotating shaft. Is broken, so this kind of power transmission It is possible to shorten the overall length of the mounted driven equipment. Further, when an overload occurs on the rotating shaft, transmission of power can be easily cut off. Therefore, there is no adverse effect on other driven devices to which power is transmitted by the belt hung on the pulley groove of the driving rotary member.

Further, the power transmission device of the present invention includes a first cylindrical portion of a drive-side connecting member having a plurality of engagement grooves formed at intervals in a circumferential direction; A second cylindrical portion of the driven-side connecting member provided with an engagement groove is provided, and the first cylindrical portion and the second cylindrical portion are overlapped in a non-contact state in the annular groove of the driving-side rotating member. The driving-side rotating member and the driven-side rotating member are coupled by fitting the coupling member to an engaging portion formed by the engaging groove of the first cylindrical portion and the engaging groove of the second cylindrical portion. Therefore, even if the coupling member breaks due to overload of the rotating shaft, it can be reused by incorporating a new coupling member.

In the power transmission device according to the present invention, the coupling member is formed by fitting an outer annular portion into which one of the cylindrical portions of the driving side or driven side connecting member is fitted and the other cylindrical portion. An inner annular portion, a connecting portion connecting the outer annular portion and the inner annular portion is provided, and each annular portion includes an outer peripheral wall portion and an inner peripheral wall portion, and a plurality of interconnecting portions connecting the outer peripheral wall portion and the inner peripheral wall portion. Since the connecting wall is provided, even if the connecting member breaks due to overload of the rotating shaft, it can be reused by incorporating a new connecting member, and because it is an integrated connecting member, Can be easily integrated.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the power transmission device of FIG.

FIG. 3 is a cross-sectional view of a power transmission device shown as another embodiment.

FIG. 4 is a plan view of the coupling member of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driving-side rotating member (pulley) 1d annular groove 3 Driving-side connecting member 4 Driving-side rotating member (hub assembly) 6 Driving-side connecting member 8 Connecting member 9 Connecting member

Claims (3)

[Claims] 1. A driving-side rotating member rotatably supported by a bearing on a cylindrical projection formed in a housing of a driven device and a rotating shaft of the driven device protruding from the cylindrical projection. In a power transmission device provided with a driven side rotating member, a coupling member that couples the driving side rotating member and the driven side rotating member, an inner cylindrical portion in which the bearing is fitted to an inner peripheral surface, and an outer peripheral surface An outer cylindrical portion formed with a pulley groove, a disk portion connecting the inner cylindrical portion and the outer cylindrical portion is provided, and the driving-side rotating member having an annular groove opened in a projecting direction of the rotating shaft; A driving-side connecting member provided in the annular groove and rotating integrally with the driving-side rotating member; and a driven-side connecting member inserted into the annular groove and overlapped with the driving-side connecting member in a non-contact state. The driven side provided with A power transmission device comprising: a connecting member in which a rotating member, the driving-side connecting member, and the driven-side connecting member are connected in the annular groove. 2. The power transmission device according to claim 1, wherein a first cylindrical portion of the drive-side connecting member having a plurality of engagement grooves formed at intervals in a circumferential direction, the first cylindrical portion being provided in a circumferential direction. A second cylindrical portion of the driven-side connecting member having a plurality of engagement grooves formed at intervals is provided, and the first cylindrical portion and the second cylindrical portion are overlapped in a non-contact state in the annular groove. In addition, the driving-side rotating member and the driven-side rotating member are fitted by fitting the coupling member into an engaging portion formed by the engaging groove of the first cylindrical portion and the engaging groove of the second cylindrical portion. A power transmission device characterized by being coupled. 3. The power transmission device according to claim 2, wherein one of the first cylindrical portion and the second cylindrical portion is fitted to the coupling member. And an inner annular portion into which the other cylindrical portion is fitted, and a connecting portion connecting the outer annular portion and the inner annular portion are provided. Each annular portion has an outer peripheral wall portion, an inner peripheral wall portion, and an outer peripheral wall portion. And a plurality of connecting walls which are provided at intervals in the circumferential direction and which are fitted in the engagement grooves.