JP2003035321A - Power transmission mechanism - Google Patents

Abstract

(57) [Problem] To provide a power transmission mechanism that can be assembled to a compressor regardless of a rotation direction. SOLUTION: This elastic member 1 is provided on an elastic member 13.
3 on the reference circle centered on the center of 3
The adjacent arc-shaped connecting portion 13a is provided with the interposed portion. Further, the holding portion 17a protruding outward in the radial direction is formed on the holding plate 17.
The radial dimension of the outer peripheral surface of the holding portion 17a is made smaller than the inner peripheral surface of the connecting portion 13a of the elastic member 13. Further, the elastic member 13 has a clamped portion 1 protruding radially inward.
3c, the inner peripheral surface of the holding portion 13c has a larger radius dimension than the outer peripheral surface of the holding plate 17. Further, when an overload is applied to the rotating shaft 2a, the holding portion 13c of the elastic member 13 comes out from between the first rotating member 3 and the holding portion 17a of the holding plate 17, and the connecting portion 13a of the elastic member 13 is moved. The power transmission mechanism 1 was assembled to the compressor 2 so as to return elastically.

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, Japanese Patent Laid-Open No.
There is one described in Japanese Patent Publication No. 001-12492. The power transmission mechanism described in this publication has a base fixed to a second rotating member (pulley) or a first rotating member (hub),
An elastic member is provided between the first rotating member or the second rotating member and the holding portion of the holding plate so that the held portion is detachably held, and the first rotation is performed when an overload is applied to the rotating shaft of the compressor. The connection between the member or the second rotating member and the held portion of the elastic member by frictional coupling is released, and the power transmission to the compressor is cut off. Further, in the elastic member, the base portion and the held portion are connected by a connecting portion that is elastically deformable in the plate thickness direction, and the held portion comes out between the first rotating member or the second rotating member and the holding portion of the holding plate. By
The connecting part is elastically restored so that the held part is displaced toward the base side.

Among the power transmission mechanisms described in the above publications, the power transmission mechanism in which an elastic member is provided with an arcuate connecting portion (for example, the power transmission mechanism shown in FIGS. 29 to 31) is the first one. An annular base portion fixed to one rotating member, an arcuate connecting portion individually extending in the rotating direction of the second rotating member from a portion obtained by dividing the circumferential direction of the base portion into three equal parts, and each connecting portion An elastic member formed at the tip and provided with a gripped portion protruding outward in the radial direction, and a holding plate having the same number of holding portions as the held portion of the elastic member protruding inward in the radial direction from the inner peripheral surface are configured, The held portion of the elastic member is detachably held between the second rotating member and the holding portion of the holding plate.

Another power transmission mechanism (for example, the power transmission mechanism shown in FIGS. 46 to 49) in which an elastic member is provided with an arcuate connecting portion is an annular member fixed to the second rotating member. The base portion, the arcuate connecting portions individually extending in the counter-rotational direction of the second rotating member from a portion obtained by dividing the circumferential direction of the base portion into three equal parts, and formed at the tip of each connecting portion to the inner side in the radial direction. An elastic member provided with a projecting held portion and a holding plate having the same number of holding portions as the held portion of the elastic member projecting outward in the radial direction from the outer peripheral surface are configured.
It is removably held between the rotating member and the holding portion of the holding plate. These power transmission mechanisms use the power transmitted to the second rotating member when an overload is applied to the rotating shaft,
Since the held portion of the elastic member comes out between the second rotating member or the first rotating member and the holding portion of the holding plate, and the connecting portion of the elastic member elastically returns, power transmission to the compressor can be interrupted. .

[0005]

A conventional power transmission mechanism has a structure in which a connecting portion of an elastic member whose base portion is fixed to a first rotating member is extended in an arc shape in a rotation direction of a second rotating member,
A configuration is adopted in which a connecting portion of an elastic member whose base portion is fixed to the second rotating member is extended in an arc shape in the counter-rotational direction of the second rotating member, and an overload is applied to the rotating shaft to brake the first rotating member. Then, by the power transmitted to the second rotating member,
When a tensile force acts on the connecting portion of the elastic member and the rotating direction of the second rotating member is opposite, the frictional coupling between the first rotating member or the second rotating member and the held portion of the elastic member is released. Up to this point, a compressive force acts on the connecting portion of the elastic member to bend the connecting portion. Further, when a compressive force is applied to the connecting portion of the elastic member, durability problems occur in the connecting portion of the connecting portion of the elastic member and the held portion and in the connecting portion of the connecting portion of the elastic member and the base portion. It was necessary to select the model depending on the rotating direction of the rotating member. It is an object of the present invention to provide a power transmission mechanism that can be mounted on a compressor or the like regardless of the rotation direction of the second rotating member.

[0006]

In order to achieve such an object, a first invention is a first rotating member (3, 19) and a second rotating member (3, 19) rotatably arranged on a coaxial line. 6, 20) and a plurality of holding portions (17a, 22a) protruding outward in the radial direction from the outer peripheral surface are provided at intervals in the circumferential direction, and the first rotating member (3, 19) or the second rotating member is provided. Holding plates (17, 2) fixed to the members (6, 20)
2) and the second rotating member (6, 20) or the first rotating member.
A plurality of bases (13) fixed to the rotating member (3, 19)
b, 24d) and the adjacent bases (13b, 24d), the same number of held parts (13c, 24) as the holding parts (17a, 22a) protruding inward in the radial direction from the inner peripheral surface.
b), a plurality of connecting portions (13a, 24a) elastically deformable in the plate thickness direction for connecting the base portions (13b, 24d) and the held portions (13c, 24b) are provided, and the held portions are held. (13c, 24b) is the first rotating member (3,
19) or an annular elastic member (13, 24) which is detachably held between the second rotating member (6, 20) and the holding portion (17a, 22a) of the holding plate (17, 22). The elastic members (13, 24) are adjacent circles on the reference circle (14) centered on the center of the elastic members (13, 24) with the held parts (13c, 24b) interposed therebetween. The arc-shaped connecting portions (13a, 24a) are provided, and the outer peripheral surfaces of the holding portions (17a, 22a) of the holding plates (17, 22) are provided with the elastic members (13, 2).
4) is set to have a smaller radial dimension than the inner peripheral surface of the connecting portion (13a, 24a) and the elastic member (13, 2).
The inner peripheral surface of the held portion (13c, 24b) of 4) is set to have a larger radial dimension than the outer peripheral surface of the holding plate (17, 22), and the first rotary member (3, 19) or the second rotary member ( When an overload is applied to the elastic member (13, 24), the held portion (13c, 24b) of the elastic member (13, 24) causes the first rotating member (3, 19) or the second rotating member (6,
20) and holding portions (17a, 17a, 22) of the holding plates (17, 22).
22a) and the elastic member (13, 2).
The connecting portions (13a, 24a) of 4) are elastically restored.

In a second aspect based on the first aspect, the elastic member (13, 24) has a small radius of curvature at the end of the connecting portion (13a, 24a) on the held portion (13c, 24b) side. The held portion (13) is formed on the peripheral surface and the outer peripheral surface.
c, 24b) are projected inward in the radial direction.

A third aspect of the invention is the first and second aspects of the invention.
The elastic members (13, 24) are the same as the elastic members (13, 2).
4) arc-shaped connecting portions (13a, 24a) adjacent to each other with a base portion (13b, 24d) interposed on a reference circle (14) centered on the center of 4), and the connecting portion (13b, The end portion of 24d) on the base portion (13b, 24d) side is formed on the inner peripheral surface having a small radius of curvature, and the base portion (13b, 24d) projects inward in the radial direction.

In a fourth aspect based on the third aspect, the elastic member (24) is extended inward in the radial direction and overlapped with the outer surface of the flange portion (19b) of the first rotating member (19). A plurality of fixed bases (24d) are provided, and a circle larger than the plate width of the base (24d) of the elastic member (24) is provided on the outer peripheral surface of the flange (19b) of the first rotating member (19). The base portion (24d) set to the groove width in the circumferential direction
It is characterized in that the same number of concave portions (19c) is provided.

A fifth invention is the first invention in the fourth invention.
The concave portion (19c) of the rotating member (19) has wall surfaces facing each other in the circumferential direction formed on the inclined surface (19d), and extends from the inner surface side of the flange portion (19b) to the outer surface side of the flange portion (19b). It is characterized in that the groove width in the circumferential direction is gradually widened.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the illustrated embodiments. 1 to 4 show a first embodiment assembled to a car air-conditioning compressor, FIG. 1 is a plan view of a power transmission mechanism, and FIG. 2 is a sectional view taken along line AA of FIG. 3 is a view taken along the line BB of FIG.
FIG. 4 shows an elastic member, (a) is a plan view, and (b) is a sectional view.

In these drawings, a power transmission mechanism 1 is assembled to a car air conditioner compressor 2 driven by the power of an engine or a motor. The car air-conditioning compressor 2 has a configuration in which the tip of a rotary shaft 2a projects outward from a cylindrical projecting portion 2b of the housing. The first rotary member (hub) 3 disposed on the rotary shaft 2a and the projecting portion are provided. A second rotating member (pulley) 6 rotatably supported on the outer peripheral surface of 2b via a bearing 7 is configured on a coaxial line.

The first rotating member 3 has a cylindrical portion 3a having a stepped hole penetrating therethrough and a small-diameter side hole formed into a spline hole which is spline-fitted into a spline groove formed at the tip of the rotating shaft 2a. Two flange portions 3b, which have a substantially trapezoidal shape and extend long in the direction orthogonal to the axis of the rotary shaft 2a from the protruding end of the rotary shaft 2a of the cylindrical portion 3a, are integrally formed. Further, a ring-shaped stopper member 4 is fitted into the hole on the large diameter side of the cylindrical portion 3a,
The inner peripheral surface of the opening is fixed by caulking. In such a first rotating member 3, the cylindrical portion 3a is spline-fitted to the rotating shaft 2a until the tip of the rotating shaft 2a contacts the stopper member 4, and then the bolt 5 is inserted from the center hole of the stopper member 4. By being screwed into the screw hole of the rotary shaft 2a, the rotary shaft 2a is integrally rotatably mounted.
In order to finely adjust the dimension between the tip end of the rotary shaft 2a and the stopper member 4, the flange portion 3b of the first rotary member 3 and the mounting surface of the elastic member 13 of the second rotary member 6 which will be described later. There is a case where the shim of.

The second rotating member 6 has a bearing 7 radially inwardly.
The outer ring is composed of a synthetic resin pulley that is integrally fixed by insert molding, and is arranged coaxially with the rotating shaft 2a. The second rotary member 6 has an inner cylindrical portion 6a having an outer peripheral surface of the bearing 7 fixed to the inner peripheral surface, an outer cylindrical portion 6b having a belt groove formed on the outer peripheral surface, an inner cylindrical portion 6a and an outer cylindrical portion 6b. And a plurality of radial ribs 6c that are integrally formed with each other at intervals in the circumferential direction, the protruding side end portions of the rotating shaft 2a of the adjacent radial ribs 6c, and the inner cylindrical portion 6a and the outer cylindrical portion. A plurality of substantially fan-shaped flange portions 6d that connect the protruding end portions of the rotary shaft 2a of the portion 6b are integrally formed, and a pair of radial ribs 6c and flanges are formed between the inner cylindrical portion 6a and the outer cylindrical portion 6b. A space surrounded by the portion 6d is provided as a housing portion S of the damper mechanism 8. Reference numeral 6e is a circumferential rib that connects the side surfaces of the adjacent radial ribs 6c between the adjacent housing portions S and also connects the outer peripheral surface of the inner cylindrical portion 6a and the inner peripheral surface of the outer cylindrical portion 6b. is there.

That is, in the second rotary member 6 of the power transmission mechanism 1 shown as the embodiment, the rotary shaft 2a is located at a position offset by 90 degrees with respect to the extending direction of the flange portion 3b of the first rotary member 3. The two accommodating portions S are provided on the side opposite to the projecting side and are formed in a tubular shape having a substantially fan shape in a plan view. Further, a through hole 6f for attaching an elastic member 13 described later is formed in the flange portion 6d which is the bottom of each accommodation portion S, and the side surface of the flange portion 6d on the side where the rotary shaft 2a projects is the elastic member. 13 is formed as a mounting surface. Such a second rotating member 6 rotates on the housing of the compressor 2 by fitting the inner ring of the bearing 7 to the protruding portion 2b of the compressor 2 and locking the snap ring 9 in the locking groove of the protruding portion 2b. It is supported freely.

The damper mechanism 8 accommodated in the accommodating portion S of the second rotating member 6 has a through hole formed in the center thereof and a damper rubber 10 whose outer peripheral surface is fitted to the wall surface of the accommodating portion S, and a screw hole in the center thereof. A tubular nut member 11 with a flange is provided. Further, the damper mechanism 8 fits the damper rubber 10 in which the tubular portion of the nut member 11 is inserted into the housing portion S, and inserts the tip of the tubular portion of the nut member 11 to the through hole 6f of the flange portion 6d. The mounting screw 12 is assembled in the housing S by screwing the mounting screw 12 into the screw hole of the nut member 11 with the base portion 13b of the elastic member 13 interposed. Furthermore, a gap is provided between the outer peripheral surface of the tubular portion of the nut member 11 and the peripheral wall of the through hole 6f of the flange portion 6d, and between the outer peripheral surface of the flange portion of the nut member 11 and the side surface of the radial rib 6c. The damper rubber 10 is formed and is elastically deformable and is assembled in the housing portion S. In addition, the elastic member 13
The base portion 13b is in contact with the mounting surface of the flange portion 6d by the elastic restoring force of the damper rubber 10. That is, the rubber hardness of the damper rubber 10 is the base 13 of the elastic member 13 due to the elastic restoring force of the connecting portion 13a of the elastic member 13, which will be described later, with the power transmission mechanism 1 assembled to the compressor 2.
It is set so that b does not float above the flange portion 6d.

Next, the elastic member 13 will be described. As shown in FIG. 4, the elastic member 13 is formed of a metal material or a non-metallic material having a set plate thickness T into an annular member, and a reference circle 14 having a radius R with the center O of the elastic member 13 as the center.
An arcuate connecting portion 13a adjacent to the base portion 13b and the held portion 13c is provided on the upper portion. Moreover, the connecting portion 1
3a has an inner peripheral surface formed in an arcuate surface having a radius R1 from the center O and an outer peripheral surface formed in an arcuate surface having a radius R2 from the center O, and has a plate width set to a dimension of R2-R1.

An end portion of the connecting portion 13a on the held portion 13c side is formed in a shape that is bent toward the center O side, and an inner peripheral surface thereof has a radius of curvature R smaller than a radius of curvature R1 of the inner peripheral surface of the connecting portion 13a.
Radius of curvature R4 (R4> R3) smaller than the radius of curvature R2 of the outer peripheral surface of the connecting portion 13a.
Is formed on the arc surface. In addition, an end portion of the connecting portion 13a on the base portion 13b side is formed such that the inner peripheral surface is an arc surface having a curvature radius R5 (R5 = R3) smaller than the curvature radius R1 of the inner peripheral surface of the connecting portion 13a, and the outer peripheral surface is connected. It is formed on an arc surface having the same radius R2 as the outer peripheral surface of the portion 13a. That is, the elastic member 13 is formed in a shape in which the held portion 13c and the base portion 13b project radially inward (center O side) from the inner peripheral surface of the connecting portion 13a, and the plate width of the base portion 13b is the plate of the connecting portion 13a. It is formed larger than the width.

The connecting portion 13a of the elastic member 13 has
A bent portion 13d that gradually increases from the base portion 13b side toward the held portion 13c side is formed, and the base portion 13b and the held portion 13c have different axial positions. When such an elastic member 13 is assembled to the car air-conditioning compressor 2, the base portion 13b and the held portion 13c are further separated from each other in the axial direction, and an elastic restoring force is applied to the connecting portion 13a. The elastic member 13 before being assembled is located between the side surface of the base portion 13b on the side contacting the mounting surface of the flange portion 6d and the side surface of the held portion 13c on the side contacting the flange portion 3b of the first rotating member 3. Is the second rotating member 6
The angle of the bent portion 13d is set to be smaller than the dimension between the mounting surface of the flange portion 6d and the side surface of the holding plate 17, which will be described later, fixed to the first rotating member 3 on the side of the flange portion 6d. .

Such an elastic member 13 is obtained by inserting the mounting screw 12 into the through hole 16 of the base portion 13b and inserting the nut member 11 into the through hole 16.
By being screwed into the second rotating member 6 via the damper mechanism 8, and the held portion 13c is fixed to the flange portion 3b of the first rotating member 3 and the first rotating member 3 with screws. The holding plate 17 is detachably held between the holding plate 17 and the holding portion 17a so that the holding plate 17 is connected (frictionally coupled) to the first rotating member 3.

The holding plate 17 is made of a thin metal plate and has a center hole loosely fitted to the outer peripheral surface of the cylindrical portion 3a of the first rotating member 3 and a center O of the elastic member 13 and a radial direction of the held portion 13c. The outer peripheral surface having a radius smaller than the radius up to the inner peripheral surface, and the flange portion 3 of the first rotating member 3.
Two holding portions 17a that extend in the same direction as b and project from the outer peripheral surface are integrally formed. Further, the holding plate 17 is set such that the radial dimension from the center to the circumferential outer surface of the holding portion 17a is smaller than the radius R1 of the elastic member 13 (see FIG. 4). Further, each holding portion 17a is provided with a through hole 17b serving as a locking portion, and a projection 15 as an engaging portion formed on the held portion 13c of the elastic member 13 is engaged with the holding portion 17a.

In the power transmission mechanism 1 of the embodiment having the above-mentioned structure, the holding plate 1 has the flange portion 3b of the first rotating member 3 and the held portion 13c of the elastic member 13 interposed therebetween.
After stacking 7 and engaging the projection 15 of the elastic member 13 with the through hole 17b of the holding plate 17, the holding plate 17 is attached to the first rotating member 3 with a plurality of attachment screws. The second rotating member 6 is rotatably assembled to the protruding portion 2b of the car air-conditioning compressor 2, and the first rotating member 3 to which the elastic member 13 and the holding plate 17 are attached is the rotating shaft 2a.
After the spline fitting, the bolt 5 is screwed onto the rotary shaft 2b to be assembled to the rotary shaft 2a. Further, by elastically deforming the connecting portion 13 a of the elastic member 13 and fixing the base portion 13 b of the elastic member 13 together with the damper mechanism 8 to the flange portion 6 d of the second rotating member 6 with the mounting screw 12, Assembly to the car air conditioner compressor 2 is completed.

Further, in the power transmission mechanism 1, since the holding portion 17a of the holding plate 17 is elastically deformed by the plate thickness T of the elastic member 13, the elastic member 13 is elastically restored by the elastic restoring force of the holding portion 17a.
The held portion 13c and the flange portion 3b of the first rotating member 3 are frictionally coupled to each other. Therefore, the frictional coupling force causes the second rotary member 6 and the first rotary member 3 to integrally rotate, and the car air-conditioner compressor 2 is driven. Further, since the damper mechanism 8 is provided between the second rotating member 6 and the elastic member 13, the impact acting on the friction coupling portion when the power is transmitted to the second rotating member 6 and the torque during the power transmission. It is possible to absorb the shock acting on the frictionally coupled portion due to the fluctuation.

Furthermore, when an overload is applied to the rotary shaft 2a, the first rotary member 3 is in a braked state, so
Due to the power transmitted to the rotating member 6, the projection 15 of the held portion 13c and the through hole 17b of the held portion 17a are disengaged against the elastic return force of the holding portion 17a of the holding plate 17, and the held portion is held. The portion 13c comes out from between the flange portion 3b and the holding portion 17a. Further, the held portion 13c of the elastic member 13 is separated from the holding plate 17 by the elastic return force of the connecting portion 13a. Therefore, power transmission from the second rotating member 6 to the first rotating member 3 is cut off.

The power transmission mechanism 1 having such an action
Is adjacent to the elastic member 13 on the reference circle 14 centered on the center O of the elastic member 13 with the held portion 13c interposed, and one is pulled by the rotation of the second rotating member 6 and the other is Since the arc-shaped connecting portion 13a to be compressed is provided, the connecting portion 13a that receives a compressive force does not bend. Therefore, the power transmission mechanism 1 can be assembled to the car air-conditioning compressor 2 regardless of the rotation direction of the second rotating member 6.

Next, the present invention will be described based on another illustrated embodiment. 5 and 6 show a second embodiment assembled to a car air conditioner compressor, FIG. 5 is a plan view of a power transmission mechanism, and FIG. 6 is a C- of FIG.
It is a C line sectional view.

In these drawings, the power transmission mechanism 18 is
Similar to the power transmission mechanism 1, a first rotary member (hub) 1 mounted on a rotary shaft 2a is attached to a car air conditioner compressor 2 driven by the power of an engine or a motor.
9 and a second rotating member (pulley) 20 rotatably supported on the outer peripheral surface of the protruding portion 2b via a bearing 21 are arranged coaxially.

The first rotary member 19 is similar to the first rotary member 3 in that the tip of the rotary shaft 2a is spline-fitted into the spline hole of the cylindrical portion 19a, and the bolt 5 inserted from the center hole of the stopper member 4 is inserted. By being screwed into the screw hole of the rotary shaft 2a, the rotary shaft 2a is integrally rotatably mounted.
In addition, a pair of substantially semicircular flange portions 19b and a pair of recessed portions 19c that are open outward in the axial direction and the radial direction are alternately provided in the circumferential direction at the end of the cylindrical portion 19a.
The flange portion 19b and the recessed portion 19c form the cylindrical portion 19
It is formed by cutting the disk integrally formed at the end portion of a from the outer peripheral surface toward the cylindrical portion 19a side and processing the recessed portion 19c at a portion where the phase is shifted by 180 degrees. Further, in the cutting process of the recessed portion 19c, the wall surfaces facing each other in the circumferential direction are formed on the inclined surface 19d, and the recessed portion 19c is formed in a circular shape from the inner side surface side of the flange portion 19b toward the outer side surface side of the flange portion 19b. The groove width in the circumferential direction is gradually widened. Each flange portion 19b is provided with a screw hole for attaching an elastic member 24 described later.

The second rotating member 20 is composed of a metallic pulley made of an annular member having a substantially U-shaped cross section, and the inner ring is press-fitted with the outer ring of the bearing 21 and fixed by caulking. There are provided a cylindrical portion 20a, an outer cylindrical portion 20b having a pulley groove formed on the outer peripheral surface thereof, and a disc portion 20c connecting the ends of the inner cylindrical portion 20a and the outer cylindrical portion 20b. Further, like the second rotating member 6, the second rotating member 20 is formed on the protruding portion 2b after the inner ring of the bearing 21 is press-fitted onto the outer peripheral surface of the protruding portion 2b of the compressor 2. By locking the snap ring 9 in the stop groove, it is rotatably supported by the compressor 2. The disc portion 20c is provided with a plurality of screw holes for attaching the holding plate 22.

The holding plate 22 is made of a thin metal plate.
A holding portion 22a which is manufactured to have a shape substantially the same as that of the above, and which projects outward in the radial direction from the outer peripheral surface is integrally formed at a position shifted in phase by 180 degrees. Further, the holding plate 22 is provided with a plurality of through holes at intervals on the circumference which is radially outside of the outer peripheral surface of the flange portion 19b of the first rotating member 19, and each holding portion 22a is provided with a plurality of through holes. Has a through hole 22b serving as a locking portion. Such a holding plate 22 is
The mounting screw 23 is inserted from each through hole and screwed into the screw hole of the disc portion 20c, thereby being fixed to the second rotating member 20 on the coaxial line. Further, when the holding plate 22 is attached to the second rotating member 20, the held portion 24b of the elastic member 24 is detachably held between the holding portion 22a and the disc portion 20c.

The elastic member 24, like the elastic member 13,
A reference circle (reference numeral 1 around the center of the elastic member 24)
4, see FIG. 4), an arcuate connecting portion 24a is provided adjacent to the base portion 24d and the held portion 24b. Further, the end of the connecting portion 24a on the held portion 24b side is
It is bent inward in the radial direction (center direction), and its inner peripheral surface and outer peripheral surface are formed into arcuate surfaces having a radius of curvature smaller than that of the other inner peripheral surface and outer peripheral surface of the connecting portion 24a. Further, the held portion 24b projects radially inward from the inner peripheral surface of the connecting portion 24a, and the inner peripheral surface of the held portion 24b is set to have a larger radial dimension than the outer peripheral surface of the holding plate 22 and is detached. The held portion 24b does not interfere with the outer peripheral surface of the holding plate 22. Similarly, the inner peripheral surface of the connecting portion 24a has a larger radial dimension than the outer peripheral surface of the holding portion 22a of the holding plate 22, and when the held portion 24b is detached,
The elastically restored connecting portion 24a does not interfere with the outer peripheral surface of the holding portion 22a. In addition, in the held portion 24b,
A protrusion 24c serving as an engaging portion is formed.

The base portion 24d of the elastic member 24 is provided at a position 90 degrees out of phase with the held portion 24b, and extends on a straight line (not shown) passing through the center of the elastic member 24. It is attached to the outer surface of the flange portion 19b of the first rotating member 19 by the attaching screw 25. That is, the substantially rectangular base portion 24 d is the base portion 13 of the elastic member 13.
Similar to b, the outer peripheral surface having the same radius as the outer peripheral surface of the connecting portion 24a and the end portion of the connecting portion 24a, which is an inner peripheral surface having a radius of curvature smaller than the radius of curvature of the inner peripheral surface of the connecting portion 24a, are connected and Extends to the outer surface side of the flange portion 19b.
In addition, each of the base portions 24d has a bent portion 2 that gradually increases in height from the connecting portion 24a side toward the tip on the flange portion 19b side.
4e is formed.

The power transmission mechanism 18 of the embodiment having the above-mentioned structure has the disc portion 20c of the second rotating member 20.
The elastic member 24 and the holding plate 22 are stacked with the protrusion 24c and the through hole 22b aligned with each other, and the holding plate 22 is fixed to the disc portion 20c by the mounting screw 23, so that the elasticity of the holding portion 22a is increased. The return force causes the second rotating member 20 and the held portion 24b of the elastic member 24 to be frictionally coupled to each other in a detachable manner. The second rotating member 20 is rotatably supported by the protruding portion 2b of the compressor 2 via a bearing 21. The first rotating member 19 is attached to the rotating shaft 2a in a state where the base portion 24d of the elastic member 24 is fitted in the recessed portion 19c.

The base portion 24d of the elastic member 24 is guided by the inclined surface 19d to the outer surface of the flange portion 19b by rotating the first rotating member 19 against the elastic return force of the connecting portion 24a. Can be posted. Furthermore, the positions of the through holes of the base portion 24b and the screw holes of the flange portion 19b are aligned, and the mounting screw 25 is screwed into the screw hole of the flange portion 19b, whereby the first rotating member 19 and the elastic member 24 are connected.

Therefore, like the power transmission mechanism 1, the power transmission mechanism 18 also has the second rotating member 20 and the elastic member 24.
The second rotary member 20 and the first rotary member 19 are integrally rotated by the frictional coupling force with the held portion 24b, and the car air-conditioner compressor 2 is driven. When an overload is applied to the rotating shaft 2 a, the first rotating member 19 is braked, and the power transmitted to the second rotating member 20 causes the holding plate 2 to move.
The held portion 24b against the elastic return force of the second holding portion 22a.
Since the protrusion 24c and the through hole 22b of the holding portion 22a are disengaged from each other, the held portion 24b comes out from between the disc portion 20c and the holding portion 22a. Further, due to the elastic restoring force of the connecting portion 24a, the held portion 24b of the elastic member 24 is separated from the holding plate 22, and the power transmission from the second rotating member 20 to the first rotating member 19 is blocked.

The power transmission mechanism 18 having such an action
Similarly to the power transmission mechanism 1, is adjacent to the elastic member 24 on the reference circle centered on the center O of the elastic member 24 with the held portion 24b interposed therebetween, with respect to the rotation of the second rotating member 20. Since the arc-shaped connecting portion 24a is provided in which one is pulled and the other is compressed, the connecting portion 24a that receives a compressive force is provided.
Never bends. Therefore, the second rotating member 20
The power transmission mechanism 18 can be assembled to the car air-conditioning compressor 2 regardless of the rotation direction of the.

Although the present invention has been described above with the power transmission mechanisms 1 and 18 shown as the embodiments, the power transmission mechanism of the present invention can be used by being assembled in a motor or the like for driving a compressor for a car air conditioner. . Also,
The structure of the power transmission mechanism and the shapes and materials of the components can be changed as long as they satisfy the design conditions according to the magnitude of the power transmitted to the driven device.

[0038]

According to the first aspect of the present invention, the elastic member is provided with the arc-shaped connecting portions which are adjacent to each other on the reference circle centered on the center of the elastic member with the held portion interposed therebetween. When the outer peripheral surface has a smaller radial dimension than the inner peripheral surface of the connecting portion of the elastic member and the inner peripheral surface of the held portion of the elastic member has a larger radial dimension than the outer peripheral surface of the holding plate, and when an overload is applied. Since the held portion of the elastic member is assembled so as to be pulled out from between the first rotating member or the second rotating member and the holding portion of the holding plate and the connecting portion of the elastic member is elastically restored, rotation of the second rotating member is performed. It is possible to provide a power transmission mechanism that can be installed in a compressor or the like regardless of the direction.

According to a second aspect of the invention, in the first aspect of the invention, the elastic member is formed such that an end portion of the connecting portion on the held portion side is formed on an inner peripheral surface and an outer peripheral surface having a small radius of curvature, and the held portion is in a radial direction. Since the structure that protrudes inward is adopted, stress does not concentrate at the part that bends from the connecting part to the held part and cracking or damage does not occur, and a power transmission mechanism with excellent quality is provided. Can be provided.

A third invention is the same as the first and second inventions,
The elastic member is provided with arcuate connecting portions that are adjacent to each other with the base portion interposed on a reference circle centered on the center of the elastic member, and the end portion on the base side of the connecting portion has a small radius of curvature. Since it is formed on the peripheral surface, and the base portion is configured to protrude inward in the radial direction, stress is not concentrated in a portion that is bent from the connecting portion to the base portion, so that cracking or damage does not occur, A power transmission mechanism with excellent quality can be provided.

According to a fourth aspect of the present invention, in the third aspect, the elastic member is provided with a plurality of base portions that extend radially inward and are overlapped and fixed to the outer surface of the flange portion of the first rotating member. Since the outer peripheral surface of the flange portion of the first rotating member is provided with the same number of recessed portions as the base portion having a groove width in the circumferential direction larger than the plate width of the base portion of the elastic member, the second rotating member is employed. With the holding plate and the elastic member pre-assembled on the coaxial line, it is possible to assemble the compressor or the like. Therefore, it is possible to provide a power transmission mechanism that can be easily assembled into a compressor or the like.

The fifth invention is the same as the first invention in the fourth invention.
The recessed portion of the rotating member forms an inclined surface on the wall surfaces facing each other in the circumferential direction so that the groove width in the circumferential direction gradually increases from the inner side surface side of the flange portion toward the outer side surface side of the flange portion. Therefore, by rotating the first rotating member after aligning the positions of the base portion and the recessed portion, the base portion of the elastic member is moved from the inclined surface to the outer surface of the flange portion against the elastic restoring force of the connecting portion. be able to. Therefore, it is possible to provide a power transmission mechanism that can be easily assembled to a compressor or the like without using a special jig.

[Brief description of drawings]

FIG. 1 is a plan view of a power transmission mechanism shown as a first embodiment.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a view taken along the line BB of FIG.

FIG. 4A is a plan view of an elastic member, and FIG. 4B is a sectional view of the elastic member.

FIG. 5 is a plan view of a power transmission mechanism shown as a second embodiment.

6 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

3 First rotating member 6 Second rotating member 13 Elastic member 17 Holding plate 19 First rotating member 20 Second rotating member 22 Holding plate 24 Elastic member

Claims (5)

[Claims] 1. A first rotating member and a second rotating member that are rotatably arranged on a coaxial line, and a plurality of holding portions that project radially outward from an outer peripheral surface are provided at intervals in the circumferential direction. A holding plate fixed to the first rotating member or the second rotating member, a plurality of bases fixed to the second rotating member or the first rotating member, and an inner peripheral surface between adjacent bases. The same number of held parts as the holding parts protruding inward in the radial direction,
A plurality of connecting portions that connect the base portion and the held portion and are elastically deformable in a plate thickness direction are provided, and the held portion holds the holding plate between the first rotating member or the second rotating member and the holding plate. And an annular elastic member that is detachably sandwiched between the elastic member and the elastic member that is adjacent to the arcuate member on the reference circle centered on the center of the elastic member. The connecting portion is provided, and the outer peripheral surface of the holding portion of the holding plate is set to have a smaller radial dimension than the inner peripheral surface of the connecting portion of the elastic member, and the inner peripheral surface of the held portion of the elastic member. Is set to have a larger radial dimension than the outer peripheral surface of the holding plate, and when the first rotating member or the second rotating member is overloaded, the held portion of the elastic member is the first rotating member or the first rotating member. 2 Rotating member and holding part of the holding plate A power transmission mechanism connecting portion of the elastic member come out of between, characterized in that the elastically restored. 2. The power transmission mechanism according to claim 1, wherein the elastic member is formed such that an end portion of the connecting portion on the held portion side is formed on an inner peripheral surface and an outer peripheral surface having a small radius of curvature. The power transmission mechanism is characterized in that the projecting portion is radially inward. 3. The power transmission mechanism according to claim 1, wherein the elastic member is provided with arcuate connecting portions adjacent to each other with a base portion on a reference circle centered on the center of the elastic member. The power transmission mechanism is characterized in that the end portion of the coupling portion on the base side is formed on the inner peripheral surface having a small radius of curvature, and the base portion projects inward in the radial direction. 4. The power transmission mechanism according to claim 3, wherein the elastic member is provided with a plurality of base portions extending inward in the radial direction and overlapping and fixed to the outer surface of the flange portion of the first rotating member. The outer peripheral surface of the flange portion of the first rotating member is provided with the same number of recesses as the base portion having a circumferential groove width larger than the plate width of the base portion of the elastic member. Power transmission mechanism characterized by. 5. The power transmission mechanism according to claim 4, wherein the recessed portion of the first rotating member has inclined wall surfaces facing each other in the circumferential direction, and the wall surface of the flange portion extends from the inner side surface of the flange portion. A power transmission mechanism characterized in that the groove width in the circumferential direction is gradually widened toward the outer surface side.