JP2000179567A - Power transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission excellent in durability and productivity. SOLUTION: A pulley 1 with engaging teeth 1f formed thereon is rotatably supported by a cylindrical projecting part A of a compressor. A hub assembly 3 is fitted to a rotary shaft B of the compressor. In the hub assembly 3, a connection plate 7 is supported by the flange part 4b of a hub 4 through a leaf spring member 6. Engaging teeth are formed in the connection plate 7, and engaged with engaging teeth 1f of the pulley 1. When the rotary shaft B is in a locked condition, the engaging teeth 1f ride over the engaging teeth against the elastic restoration force of the leaf spring member 6. The leaf spring member 6 is inverted, and the engaging teeth are disengaged from the engaging teeth 1f.

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 in which transmission of power is interrupted by increasing the load on a rotating shaft of a driven device.

[0002]

2. Description of the Related Art As a conventional power transmission device, for example, a device proposed in JP-A-10-252857 is representative. The power transmission device described as the third embodiment among the power transmission devices in that publication transmits power to a compressor (variable displacement type compressor) of an automobile air conditioner, and the compressor is locked. When the load on the rotating shaft rises, the transmission of power is cut off.

That is, the conventional power transmission device is provided with a pulley rotatably supported by a bearing at a cylindrical projection of the compressor, and a hub assembly integrally mounted on a rotary shaft of the compressor, and formed on the pulley. When the power is transmitted by the meshing of the plurality of meshing teeth and the plurality of meshing teeth formed on the hub assembly, and when the load on the rotating shaft increases,
This is a structure in which the meshing teeth of the hub assembly are retracted, the meshing is released, and the transmission of power is cut off.

The above-mentioned pulley has an inner cylindrical portion in which a bearing is fitted on an inner peripheral surface, an outer cylindrical portion in which a pulley groove is formed on an outer peripheral surface, and a disk portion connecting the ends of these cylindrical portions. And a plurality of meshing teeth integrally formed on the side surface of the disk portion. The hub assembly includes a hub spline-fitted to the rotating shaft of the compressor and fixed with bolts, a leaf spring member having a base end fixed to the flange portion of the hub with a plurality of rivets, and a leaf spring member. A connecting plate fixed to the free end with a plurality of rivets and formed with a plurality of meshing teeth meshing with the meshing teeth of the pulley is provided.

The leaf spring member is provided with an annular free end and a plurality of elastic flexures extending in the center direction at positions where the inner peripheral surface of the free end is equally divided. The shape is a part. Further, the leaf spring members having such a shape are overlapped with each other by aligning the rivet insertion holes formed at the free ends, and the above-mentioned connecting plate is fixed to the free ends by rivets. Further, by elastically deforming the elastic bending portion of each leaf spring member and superimposing each base end, and fixing the base end to the flange portion of the hub with a rivet, the free end with respect to the base end is obtained. Part is displaced in the axial direction.

In the conventional power transmission device having such a structure, after the pulley is rotatably supported on the cylindrical projection of the compressor, the position is adjusted so that the meshing teeth of the pulley and the meshing teeth of the connecting plate mesh with each other. Then, the hub is mounted on the rotating shaft of the compressor. By attaching the hub, the leaf spring member is elastically deformed in the axial direction.
The meshing teeth of the connecting plate are pressed against the meshing teeth of the pulley.

When the compressor is mounted on an automobile, a belt that is also applied to a pulley of another automobile auxiliary machine is applied to the pulley, so that power can be transmitted to the rotary shaft of the compressor. Thus, the compressor is driven together with another automotive accessory. When the rotating shaft of the compressor is locked during such transmission of power, the meshing teeth of the pulley ride on the meshing teeth of the connecting plate against the elastic return force of the leaf spring member, and the leaf spring member is inverted. The connecting plate is separated from the pulley. Then, the power transmission is completely shut off.

[0008]

However, in a conventional power transmission device, a leaf spring member is formed by elastically deforming an elastic bending portion formed integrally with an annular free end portion and overlapping the base end portion. It is elastically deformed like a disc spring. Therefore, during transmission of power, the portion where the free end and the elastic bending portion are connected, around the rivet insertion hole at the base end fixed to the hub with rivets, and at the free end where the connecting plate is fixed with rivets The leaf spring member is easily broken at a portion where stress is concentrated, such as around the rivet insertion hole. In addition, the base end of the leaf spring member must be fixed to the hub with rivets in a state in which the base is overlapped by elastically deforming the elastic bending portion, which causes a problem that assembly work is troublesome and productivity is poor. is there. An object of the present invention is to solve such a problem and to provide a power transmission device having good durability and productivity.

[0009]

In order to achieve the above object, a power transmission device described in claim 1 is rotatably supported by a cylindrical projecting portion of a driven device by a bearing and has a side surface. A drive-side rotating member having a plurality of meshing teeth formed thereon, and a hub mounted on a rotating shaft of a driven-side device,
A leaf spring member having a base end portion fixed to the hub, and a driven-side rotating member having a connecting plate fixed to a free end portion of the leaf spring member and having a plurality of meshing teeth formed on a side surface are provided.
In the power transmission device in which the connecting plate is pressed by the drive-side rotating member and the meshing teeth mesh with each other by the elastic return force of the leaf spring member acting by attaching the hub to the rotating shaft, the leaf spring member is The base end and the disk-shaped free end, a conical elastic bending portion connecting these ends, and a radially extending portion formed at a position obtained by dividing the circumferential direction of the elastic bending portion into a plurality of portions. A plurality of through-holes are formed, and the arc-shaped connecting plate divided and arranged is fixed to a free end of the leaf spring member.

According to a second aspect of the present invention, in the power transmission device of the first aspect, the connecting plate is fixed to a free end of the leaf spring member by insert molding. Features.

[0011]

1 to 3 show a power transmission device according to an embodiment of the present invention. 1 is a cross-sectional view of only the upper half of the power transmission device in a power transmission state, FIG. 2 is a cross-sectional view of only the upper half of the power transmission device in a state where power transmission is cut off, and FIG. 3 is a fixed connection member. It is a top view of a leaf spring member. The power transmission devices shown in these drawings are provided with a driving-side rotating member rotatably supported by a cylindrical projection provided on a compressor of an automobile air conditioner, and a driven-side rotating member mounted on a rotating shaft of the compressor. In this structure, the meshing teeth of the driving side rotating member and the meshing teeth of the driven side rotating member mesh with each other by the elastic return force of the leaf spring member.

The drive-side rotating member is a pulley 1 made of a synthetic resin material formed by filling a synthetic resin material into a mold in which a bearing 2 is inserted. The pulley 1 includes an inner cylindrical portion 1a having an outer ring of a bearing 2 integrally fixed to an inner peripheral surface thereof;
An outer cylindrical portion 1b having a pulley groove formed on the outer peripheral surface, a disk portion 1c connecting the ends of the cylindrical portions 1a and 1b, an annular groove defined by the cylindrical portions 1a and 1b and the disk portion 1c; A plurality of reinforcing ribs 1e formed in the annular groove are provided. A plurality of trapezoidal meshing teeth 1f are formed on the same circumference on the outer side surface of the disk portion 1c.

The driven-side rotating member includes a rotating shaft B of the compressor.
The hub assembly 3 is mounted on the hub assembly. The hub assembly 3 includes a boss portion 4a having a spline hole to be fitted into a spline groove formed at the shaft end of the rotating shaft B, and a boss portion 4a.
Annular flange 4b extending radially outward from the end of the
, A contact plate 5 superimposed on the outside of the flange 4 b of the hub 4, the flange 4 b of the hub 4
A leaf spring member 6 having a base end portion 6a overlapped on the inside thereof, and a connecting plate 7 integrally fixed to a free end portion 6b of the leaf spring member 6 are provided.

The contact plate 5 and the base end 6a of the leaf spring member 6 which are superimposed on the flange portion 4b of the hub 4 are fixed to the flange portion 4b with a plurality of rivets 8, and the contact plate 5 is The hub assembly 3 is integrated with the rotating shaft B by screwing the bolt 9 inserted from the center hole of the contact plate 5 into the rotating shaft B after the spline fitting until the end surface of the rotating shaft B abuts. It is attached to.

The leaf spring member 6 is a leaf spring formed by pressing a metal plate. The leaf spring member 6 is connected to a disc-shaped base end 6a having a rivet insertion hole 6c through which the rivet 8 is inserted. A disk-shaped free end 6b in which the plate 7 is fixed and a through hole 6f for preventing rotation of the connection plate 7 divides the circumferential direction into eight equal parts, and an outer peripheral end of the base end 6a And a conical elastic bending portion 6d connecting the inner portion of the free end portion 6b to the inner peripheral end of the free end portion 6b.
A plurality of radially extending through holes 6e are formed at equally divided positions. The through hole 6e is provided at the base end 6a.
Is formed up to.

The connecting plate 7 is a connecting plate 7 made of a synthetic resin material formed by filling a synthetic resin material into a mold in which the leaf spring member 6 is inserted. In order to reduce the resistance to the elastic deformation, they are divided and arranged at intervals in the circumferential direction. That is, the synthetic resin material filled into the mold by insert molding is filled outside the free end 6b of the leaf spring member 6 such that several free ends 6b (four) are exposed outside. At the same time, it is filled into the through hole 6f. In addition, connecting plate 7
, A trapezoidal meshing tooth 7a similar to the meshing tooth 1f of the pulley 1 is formed at the same position as the through hole 6f formed in the free end 6b.

In the power transmission device having the above structure, the hub assembly 3 is mounted on the rotating shaft B so that the leaf spring member 6 is elastically deformed. 7 is pressed by the pulley 1 and the meshing teeth 7a of the connecting plate 7 mesh with the meshing teeth 1f of the pulley 1.
The belt that can be hanged on other automotive accessories is also a pulley 1
The compressor is driven by the power of the automobile engine. Further, when the compressor is locked during the transmission of such power, the power transmission device resists the elastic return force of the leaf spring member 6 so that the meshing teeth 1f move the meshing teeth 7a.
The connecting plate 7 moves backward with respect to the pulley 1 and the plate spring member 6 is inverted as shown in FIG.
Is separated from the pulley 1. Therefore, the transmission of power is completely cut off when the load on the rotating shaft B increases.

In the above description, the structure in which the connecting plate 7 is fixed to the free end 6b of the leaf spring member 6 by insert molding of a synthetic resin material has been described, but the connecting plate 7 is fixed with rivets, bolts and nuts. You may. Although the base end 6a of the leaf spring member 6 has been described as a disk-shaped base end 6a, the base end 6a may be divided using the through hole 6e as a slit. That is, any structure may be used as long as the through hole 6e is provided while the leaf spring member 6 is fixed to the hub 4.

Although the pulley 1 made of a synthetic resin material in which the bearing 2 is inserted by insert molding of a synthetic resin material has been described, a pulley 1 made of a general steel material may be used. Further, the structure has been described in which the amount of elastic deformation of the leaf spring member 6 is determined by abutting the contact plate 5 on the end surface of the rotation shaft B. However, a shim is provided between the contact plate 5 and the end surface of the rotation shaft B. The amount of elastic deformation described above can be adjusted by interposing the above. Further, the contact plate 5 can be formed integrally with the hub 4.

[0020]

According to the power transmission device of the present invention, a base end portion, a disk-shaped free end portion, a conical elastic bending portion connecting these ends, and a circumferential direction of the elastic bending portion are divided into a plurality of portions. A leaf spring member having a shape formed with a plurality of through holes extending in the radial direction and formed at a position defined above, and a divided arc-shaped connecting plate is fixed to a free end of the leaf spring member. With this structure, there is no need to elastically deform the base end of the leaf spring member and assemble it into a hub or the like, so that a power transmission device with good durability and productivity can be provided. In addition, since the arcuate connecting plate divided and arranged is provided, it is possible to reduce the resistance against the elastic deformation of the plate spring member when the plate spring is inverted, and to reliably separate the connecting plate from the driving side rotating member when an overload occurs. can do.

Further, in the power transmission device of the present invention, the connecting plate is fixed to the free end of the leaf spring member by insert molding, so that the connecting plate is fixed to the free end of the leaf spring member by a fastening member such as a rivet. The labor for fixing is eliminated, and the productivity of the power transmission device is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of only an upper half of a power transmission device in a power transmission state.

FIG. 2 is a cross-sectional view of only the upper half of the power transmission device in a state where power transmission is cut off.

FIG. 3 is a plan view of a leaf spring member to which a connecting member is fixed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pulley (drive side rotating member) 3 Hub assembly (driven side rotating member) 6 Leaf spring member 7 Connecting plate

Claims (2)

[Claims] 1. A drive-side rotating member rotatably supported by a bearing on a cylindrical projection of a driven-side device and having a plurality of meshing teeth formed on a side surface, and a hub mounted on a rotating shaft of the driven-side device. And a leaf spring member having a base end fixed to the hub, and a driven side rotation member having a connecting plate fixed to a free end of the leaf spring member and having a plurality of meshing teeth formed on a side surface, In the power transmission device in which the connecting plate is pressed by the drive-side rotating member and the meshing teeth mesh with each other by the elastic return force of the leaf spring member acting by attaching the hub to the rotating shaft, the leaf spring member is The base end and the disk-shaped free end, a conical elastic bending portion connecting these ends, and a radially extending portion formed at a position obtained by dividing the circumferential direction of the elastic bending portion into a plurality of portions. Multiple through holes are provided A power transmission device characterized in that the arcuate connecting plate divided and arranged is fixed to the free end of the leaf spring member. 2. The power transmission device according to claim 1, wherein the connecting plate is fixed to a free end of the leaf spring member by insert molding.