JP2000018157A - Power transmission unit of compressor without clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission unit of compressor without clutch to restrain pressurizing noise, improve durability, reduce cost, and to prevent rotating balls from flying. SOLUTION: In a recess portion 32 of a holder plate 30 fixed to a pulley 10, a damper rubber 60 fixed to a damper retaining plate 50 is accommodated and is urged by a stopper plate 40 to the direction of a housing 1. To the damper retaining plate 50, a torque transmission pin 51 is fixed, with one end 51a thereof abutting to the stopper plate 40 and the other end 51b engaged with a hole 22 of a hub 20. When the load torque is at or greater than the predetermined value, the one end 51a of the torque transmission pin 51 is engaged with a hole formed on the stopper plate 40 and the other end of the pin 51 exits the hole 22 to release the connected state between the damper retaining plate 50 and the hub 20. Accordingly, transmission of driving force from the pulley 10 to a rotation axis 2 is blocked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power transmission device for a clutchless compressor.

[0002]

2. Description of the Related Art In a compressor with a clutch, the driving force of an engine is transmitted to a rotating shaft of the compressor via an electromagnetic clutch.

When an abnormality such as seizure occurs inside the compressor, the electromagnetic clutch is disengaged based on the temperature and pressure inside the compressor, and engine stall due to excessive load applied to the engine is avoided. .

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

Japanese Patent Application Laid-Open No. Hei 8-210250 discloses that a bearing is press-fitted into a housing, and the bearing is rolled between a pulley rotatably provided on the housing via the bearing and a hub fixed to a rotating shaft. When the ball is sandwiched, the hub is urged to the pulley side by a metal spring, and when the load torque on the compressor side becomes excessive, the rolling ball is released from the recess of the hub, and power is transmitted from the pulley to the rotating shaft. A power transmission device for a clutchless compressor is disclosed.

In this power transmission device for a clutchless compressor, an annular elastic body is interposed between the pulley and the hub, so that the fluctuation of the load torque is reduced by the elastic body.

[0007]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No. Hei 8-2
The power transmission device of the clutchless compressor disclosed in Japanese Patent No. 10250 has the following problems.

Although the axial force always acts on the bearing, when the load torque on the compressor side exceeds a predetermined value, the force further increases, so that the bearing generates noise.

[0009] Since the torque transmitting mechanism and the torque damping mechanism are composed of different parts, the number of parts increases and the cost increases.

The rolling balls and the recesses of the hub gradually wear, and thus play occurs. Further, when the metal spring that urges the rolling ball is broken, the metal spring and the rolling ball may be scattered or fall.

Although an annular elastic body is adhered to the pulley side in order to exert a torque damping function, the diameter of the elastic body increases due to the structure, and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to reduce noise, improve durability and reduce manufacturing cost, and to prevent the scattering of rolling balls and the like. An object of the present invention is to provide a power transmission device for a compressor.

[0013]

According to a first aspect of the present invention, an external drive source is connected to a drive shaft housed in a housing via a pulley rotatably mounted on the housing. A power transmission device for a clutchless compressor for transmitting a driving force, wherein the rotation shaft is provided at an end of the drive shaft protruding from the housing to the outside, and rotates integrally with the drive shaft; A damper holding plate facing the side rotating body and movable in the axial direction of the drive shaft; and a damper holding plate interposed between the pulley and the damper holding plate, for urging the damper holding plate in the axial direction of the drive shaft. And the compressor-side load torque becomes greater than or equal to a predetermined value, and the elastic deformation of the elastic member causes the damper holding plate to move in the circumferential direction of the drive shaft with respect to the pulley by a predetermined amount or more. When moved, the move the damper holding plate in the axial direction of the drive shaft, characterized in that it comprises a blocking means for blocking power transmission between the pulley and the drive shaft.

When the load torque on the compressor side exceeds a predetermined value due to an abnormality in the compressor, the damper holding plate moves in the circumferential direction of the drive shaft due to the elastic deformation of the elastic member, and the damper holding plate is moved to the drive shaft. , The power transmission between the pulley and the drive shaft is interrupted, and the pulley idles. Further, torque transmission and torque damping are performed by the elastic member.

According to a second aspect of the present invention, there is provided a power transmitting device for a clutchless compressor for transmitting a driving force of an external driving source to a driving shaft housed in a housing via a pulley rotatably mounted on the housing. A rotating shaft-side rotating body provided at an end of the drive shaft protruding from the housing to the outside and rotating integrally with the drive shaft; and an axial direction of the drive shaft facing the rotating shaft-side rotating body. A damper holding plate movable between the pulley and the damper holding plate, an elastic member for urging the damper holding plate in the axial direction of the drive shaft, the compression member being provided on the damper holding plate; A torque transmission pin that engages with an engagement portion provided on the hub when the machine side load torque is equal to or less than a predetermined value to enable power transmission between the pulley and the drive shaft; A pulley-side rotator that rotates integrally with the pulley-side rotator, and guides one end of the torque transmission pin when the elastic member is elastically deformed by a predetermined amount or more in a circumferential direction of the drive shaft. The torque transmission pin is configured to include an introduction portion for releasing an engagement state of the torque transmission pin with the engagement portion.

When the load torque on the compressor side exceeds a predetermined value due to an abnormality inside the compressor, the damper holding plate moves in the rotation direction due to the elastic deformation of the elastic member. When the elastic member is elastically deformed by a predetermined amount or more in the circumferential direction of the drive shaft, one end of the torque transmission pin is guided to the introduction portion of the pulley-side rotating body, and the other end of the torque transmission pin is pulled out of the engagement portion of the hub. Then, the engagement state of the torque transmission pin with the engagement portion is released, and the pulley idles. Further, torque transmission and torque damping are performed by the elastic member.

[0017]

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

FIG. 1 is a cross-sectional view showing a power transmission device for a clutchless compressor according to a first embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. It is an exploded perspective view of a power transmission device.

FIGS. 1 and 2 show a state where the load torque on the compressor side is within a predetermined value.

The power transmission device of the clutchless compressor includes a pulley 10 and a hub (rotary shaft side rotating body) 20.

The pulley 10 is rotatably supported by a boss 1a of the housing 1 via a radial bearing 5, and has a rotational force from an engine (external drive source) (not shown) about a rotary shaft (drive shaft) 2 as a center of rotation. Rotate by.

The hub 20 is fixed to an end of the rotating shaft 2 protruding from the housing 1 by a bolt 6 and a washer 6a.

An annular holder plate 30 is fixed to the pulley 10 fixed to the outer ring 5a of the radial bearing 5 together with a stopper plate (rotary body on the pulley side) 40. The pulley in the claims is a concept including the pulley 10 and the holder plate 30.

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

The outer peripheral edge of the holder plate 30 is formed with a flange portion 31 protruding toward the front side (left side in FIG. 1).

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

An opening 36 through which the hub 20 can be inserted is formed at the center of the holder plate 30.

The holder plate 30 has three holes 34 corresponding to the respective recesses 33.

The stopper plate 40 has a hole 45 through which the tubular portion 21 of the hub 20 can be inserted and a torque transmitting pin 51.
And three holes (introduction portions) 41 capable of accommodating the one end 51a of the light emitting device.

The substantially triangular stopper plate 40
At the apex portion of the flange, a flange portion 42 bent in a crank shape is provided.
Are provided, and a hole 43 is formed in the collar portion 42.

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

The other end 51b of the torque transmitting pin 51 fixed to the damper holding plate 50 is attached to the substantially triangular hub 20.
Are formed with three holes (engaging portions) 22 which can engage with the holes.

The torque transmitting pin 51 is provided with a projection 5 formed at an intermediate portion of each side of the substantially triangular damper holding plate 50.
2 respectively.

A disk-shaped damper rubber (elastic member) 60 is fixed to each vertex portion of the damper holding plate 50 by a rivet 53. That is, the rivet 53 is fixed to the center hole 61 of the damper rubber 60, and one end of the rivet 53 is caulked at the vertex of the damper holding plate 50.

The damper rubber 60 has a cross-sectional shape shown in FIG. 4 in a free state. 1 shows a state in which the damper rubber 60 is elastically deformed in the axial direction.

A hole 55 is provided in the center of the damper holding plate 50 to allow the tubular portion 21 of the hub 20 to escape.

When the holder plate 30 and the damper holding plate 50 are assembled, the disk-shaped damper rubber 60 is housed in the arc-shaped concave portion 32, and the damper rubber 60 is
1a.

Holder plate 30 and stopper plate 4
0 is fixed to the pulley 10 by a rivet 35 inserted into the hole 34 and the hole 43.

The other end 51b of the torque transmitting pin 51 is connected to the hub 2
0 of the stopper plate 4
0 is not accommodated in the hole 41, and the flat portion 40a near the hole 41
Is in contact with

The torque transmitting pin 51 is urged away from the housing 1 by an elastic force with the damper rubber 60.

When the load torque on the compressor side is within a predetermined value, the rotational force of the pulley 10 is transmitted to the rotary shaft 2 via the power transmission path (damper rubber 60, damper holding plate 50, torque transmission pin 51, and hub 20). The rotation is transmitted and the rotating shaft 2 rotates.

At this time, the damper rubber 60 is elastically deformed by the flange portion 31 of the holder plate 30, and the fluctuation of the load torque on the compressor side is reduced by the damper rubber 60 and transmitted to the pulley 10.

FIG. 4 is a sectional view showing a power transmission device of the clutchless compressor according to the first embodiment of the present invention, and FIG. 5 is a view taken in the direction of arrow B in FIG.

FIGS. 4 and 5 show a state in which a load torque equal to or more than a predetermined value acts. The direction of rotation of the pulley 10 is indicated by an arrow a.

When the load torque on the compressor side exceeds a predetermined value, the damper holding plate 50 moves relative to the pulley 10 against the elastic force of the damper rubber 60, and the damper rubber 60 It is pressed against the contact portion 31a and elastically deforms.

When the damper rubber 60 is elastically deformed in the circumferential direction of the rotary shaft 2 by a predetermined amount or more, the torque transmission pin 51 moves in the axial direction (axial direction parallel to the rotary shaft 2). That is,
One end 51a of the torque transmission pin 51 is connected to the stopper plate 4
The other end 51b of the torque transmission pin 51
Escapes from the hole 22 of the hub 20.

As a result, the coupling state between the damper holding plate 50 and the hub 20 is released, and the rotating shaft 2
The transmission of the driving force to the pulley 10 is cut off, and the pulley 10 idles while the damper rubber 60 is held by the holder plate 30.

According to the power transmission system for a clutchless compressor of this embodiment, the following effects are exhibited.

Even when the load torque on the compressor side exceeds a predetermined value, a large load is not applied to the radial bearing 5 and
Noise can be reduced, and the durability (reliability) of the compressor improves.

Since torque transmission and torque damping can be performed by the damper rubber 60, the number of parts can be reduced, and it is not necessary to increase the diameter of the damper rubber as in the conventional example, and the damper rubber is not bonded to the pulley side. ,
Cost can be reduced.

Since there is no rolling ball and a recess for accommodating the rolling ball as in the conventional example, there is no danger of rattling due to abrasion or scattering or falling of the rolling ball due to breakage of the metal spring.

[0052]

As described above, according to the power transmission system for a clutchless compressor of the present invention, since a large force does not act in the axial direction, noise can be reduced and durability can be improved. be able to. Further, since torque transmission and torque damping are performed by the elastic member, the number of parts can be reduced, and the cost can be reduced. Further, scattering and falling of rolling balls and the like can be prevented.

[Brief description of the drawings]

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

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

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

FIG. 4 is a sectional view showing a power transmission device of the clutchless compressor according to the first embodiment of the present invention.

FIG. 5 is a view on arrow B in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Rotary shaft (drive shaft) 10 Pulley 20 Hub 22 Hole (engagement part) 30 Holder plate 31a Contact part 40 Stopper plate (Pulley side rotating body) 41 Hole (introduction part) 50 Damper holding plate 51 Torque transmission pin 53 Rivets 60 Damper rubber (elastic member) 61 Center hole

Claims (2)

[Claims] 1. A power transmission device for a clutchless compressor for transmitting a driving force of an external driving source to a driving shaft housed in a housing via a pulley rotatably mounted on the housing, wherein A rotating shaft-side rotator provided at an end of the drive shaft protruding toward the shaft and rotating integrally with the drive shaft; and a damper holding opposed to the rotating shaft-side rotator and movable in the axial direction of the drive shaft. A plate, interposed between the pulley and the damper holding plate,
An elastic member for urging the damper holding plate in the axial direction of the drive shaft; a compressor-side load torque becomes equal to or more than a predetermined value; and the elastic member deforms the damper holding plate in a circumferential direction of the drive shaft. And a shutoff means for moving the damper holding plate in the axial direction of the drive shaft when a relative movement with respect to the pulley by a predetermined amount or more, and shutting off power transmission between the pulley and the drive shaft. A power transmission device for a clutchless compressor, characterized in that: 2. A power transmission device of a clutchless compressor for transmitting a driving force of an external driving source to a driving shaft housed in a housing via a pulley rotatably mounted on the housing, wherein A rotating shaft-side rotator provided at an end of the drive shaft protruding toward the shaft and rotating integrally with the drive shaft; and a damper holding opposed to the rotating shaft-side rotator and movable in the axial direction of the drive shaft. Plate, interposed between the pulley and the damper holding plate,
An elastic member that urges the damper holding plate in the axial direction of the drive shaft; engages with an engaging portion provided on the damper holding plate and provided on the hub when a compressor-side load torque is equal to or less than a predetermined value; A torque transmission pin that enables power transmission between the pulley and the drive shaft; a pulley-side rotator that rotates integrally with the pulley; and a pulley-side rotator provided on the pulley-side rotator; And an introduction portion for introducing one end of the torque transmission pin to release the engagement state of the torque transmission pin with the engagement portion when elastically deformed by a predetermined amount or more in the circumferential direction of the shaft. Power transmission device for clutchless compressors.