KR101567083B1 - Power transmission apparatus for a compressor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission apparatus for a compressor used in an air conditioning system of a vehicle. The power transmission device of the present invention further includes a cushion bracket 30 between the pulley 10 and the damper 40. The cushion bracket 30 has a cushioning portion 35 made of an elastic material, And the ring body 31 is engaged with the damper 40 in a state where the ring body 31 is spaced apart from the pulley 10. The rotational force transmitted from the engine to the pulley 10 is transmitted to the damper 40 coupled with the cushioning bracket 30 through the cushioning portion 35 so that the damper 40 rotates together with the pulley 10 . At this time, the impact or vibration between the pulley 10 and the damper 40 is buffered by the buffer 35 at first. In addition, since the pulley 10 and the damper 40 are spaced apart from each other except for the buffer part 35, wear and noise due to the collision are prevented.

Compressor, power transmission device, damper, pulley, cushion bracket

Description

Technical Field [0001] The present invention relates to a power transmission apparatus for a compressor,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor used in an air conditioning system of a vehicle, and more particularly, to a power transmission device of a compressor capable of shutting off power transmission from an engine to a compressor when an overload occurs in the compressor.

BACKGROUND ART [0002] In general, a compressor for an automobile receives a driving force of an engine through a belt to compress a refrigerant. When a compressor is required to be driven, the driving force is transmitted by interrupting the clutch.

2. Description of the Related Art In recent years, a variable capacity type compressor capable of adjusting a required power according to a cooling state has been widely used. In such a variable capacity type compressor, a clutch for interrupting the driving force transmitted from the engine to the compressor is unnecessary.

In this clutchless compressor, when a load greater than a set value is generated in the compressor, that is, when an overload torque larger than a normal transmission torque occurs, the center shaft of the compressor is not rotated, A situation will occur that stops together. At this time, since the belt driven by the engine continues to slide on the pulley, wear of the belt occurs, and the belt is broken due to the resistance heat generated at this time.

In order to solve the above problems, a compressor is equipped with a power transmission device capable of shutting off power transmission in an overload operation.

Fig. 1 is an exploded perspective view of a structure of a power transmission device for a compressor according to the prior art. The pulley 1 is rotated by the driving force transmitted from the engine, and a belt (not shown) driven by the engine is connected to the outer circumferential surface of the pulley 1. On the inner peripheral surface of the pulley 1, a bearing 2 serving to support the pulley 1 in a rotatable manner is provided.

A limiter (3) is provided on the inner peripheral surface of the pulley (1). The limiter 3 is formed of a metal material such as aluminum or a plastic material. The limiter 3 serves to cut off power transmission between the pulley 1 and the hub 6, which will be described below, when a torque of the set value or more is generated in the compressor.

To this end, the limiter (3) is provided with a plurality of ruptures (5). The rupture portion 6 is a portion that is broken when a torque of a certain reference or more is applied. The limiter 3 is connected by a rivet R to a damper 8 which will be described below.

The limiter (3) is engaged with the hub (6). The hub 6 is coupled with the limiter 3 and rotates together. At the same time, the hub 6 is coupled to a rotary shaft (not shown) of the compressor to rotate the rotary shaft.

A damper (8) is fastened to the pulley (1) by a bolt (B). The damper 8 is for absorbing a shock due to the change of the torque, and is coupled with the limiter 3 as shown and rotated together.

The operation of the power transmission device of the compressor having such a structure will be described.

A rotation torque is generated and transmitted to the limiter 3 via the damper 8. The torque is transmitted to the hub 3 connected to the limiter 3 6 to rotate the rotary shaft of the compressor.

At this time, when a load equal to or greater than a set value is generated in the compressor or the compressor is damaged and the rotation of the rotary shaft is stopped, a torque is generated in the limiter 3 by the power transmitted from the engine. When the torque exceeds the predetermined reference value, the break portion 5 of the limiter 3 is broken. In this case, the hub 6 connected to the rotary shaft stops rotating, and the pulley 1 continuously rotates by the driving force of the engine regardless of the hub 6, so that the failure of the power transmitting device of the compressor Can be prevented.

However, the conventional power transmission device for a compressor has the following problems.

The damper 8 absorbs shocks caused by changes in the torque transmitted from the compressor. When the change in torque is severe, the damper 8 can not sufficiently cushion the damper 8. If the damper 8 does not sufficiently absorb the change in torque, noise may be generated at a portion where the belt and the pulley 1 are frictioned.

In addition, the damper 8 is directly fastened to the pulley 1 by bolts. However, there is a problem that friction or noise is generated at a portion where the damper 8 and the pulley 1 are fastened.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power transmission device for a compressor that can more effectively absorb a change in torque of a compressor.

Another object of the present invention is to provide a power transmission device for a compressor that minimizes wear and noise between a damper and a pulley.

According to an aspect of the present invention for achieving the above object, the present invention provides a pulley comprising: a pulley rotated by a driving force transmitted from an engine; a pulley which rotates together with the pulley and absorbs an impact of a torque change transmitted from a rotary shaft of the compressor; A damper, a limiter coupled to the damper and rotated together to prevent a driving force of the engine from being transmitted to the rotary shaft when the compressor is subjected to a torque higher than a set value and is damaged, and a rotary shaft connected to the limiter and the rotary shaft, And a damper bracket disposed between the pulley and the damper and having one side fixed to the pulley and the other side coupled to the damper, the power transmission device further comprising a buffer bracket disposed between the pulley and the damper, do.

The cushioning bracket includes a ring body coupled to the damper and spaced apart from the pulley, a fixed piece extending from one side of the ring body toward the pulley and inserted into the insertion hole of the pulley, And a shock absorbing part which is inserted and fixed in the insertion hole and is made of an elastic material to absorb shock.

And a latching protrusion formed at an end of the buffering portion is hooked on a latching protrusion formed on the inner side of the insertion hole so as to firmly fix the buffering portion.

And a bent portion (34) is formed at an end portion of the fixing piece so as to be firmly coupled with the buffer portion.

According to the power transmission device for a compressor according to the present invention, the following effects can be expected.

The power transmission device of the present invention further includes a shock absorbing bracket connecting the damper and the pulley, and the impact between the damper and the pulley is sufficiently buffered by the shock absorbing bracket, so that the change in torque of the compressor can be more effectively absorbed, Thereby preventing noise generated in the vehicle.

In the present invention, the damper and the pulley are kept separated from each other by the cushioning bracket, and the power transmission between the damper and the pulley is performed through the cushioning portion of the cushioning bracket fixed to the insertion hole of the pulley. Noise is prevented and durability of the compressor power transmission apparatus is improved.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a power transmission apparatus for a compressor according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is an exploded perspective view showing a structure of a preferred embodiment of a power transmission device for a compressor according to the present invention, and FIG. 3 is a cross-sectional perspective view of the structure of a power transmission device for a compressor according to an embodiment of the present invention.

According to this, a pulley 10 is rotatably installed in a housing (not shown) of the compressor. A belt (not shown) driven by the engine is connected to the outer circumferential surface of the pulley 10, and the pulley 10 receives the driving force of the engine and rotates.

The pulley 10 is formed with a seating portion 11 on which a damper 40 to be described later is seated. The seat portion 11 is formed in a circular concave shape at the center of the pulley 10. A through hole 12 is formed in the center of the seating part 11 and a bearing 20 and a hub 60 to be described later are installed on the inner circumferential surface of the through hole 12.

Three insertion holes 15 are formed in the seating part 11 so as to penetrate through the peripheries of the through holes 12 at equal intervals. A cushioning portion 35 of a cushioning bracket 30 to be described later is inserted and fixed to the insertion hole 15. As shown in FIG. 3, a latching protuberance 16 is formed at one side of the inner surface of the insertion hole 15 so as to be engaged with the end of the buffering part 35.

On the other hand, a cylindrical bearing 20 is provided on the inner circumferential surface of the through hole 12 so as to smoothly rotate while supporting the load of the pulley 10. 3, the bearing 20 includes a cylindrical inner race 21 installed in a compressor housing (not shown), a cylindrical outer race 25 rotated together with the pulley 10, And a ball 27 positioned between the race 21 and the outrace 25 and allowing them to rotate relative to each other.

The shock absorbing bracket 30 is a member for connecting the pulley 10 and a damper 40 to be described later. 3, the ring body 31 of the cushion bracket 30 is formed in a ring shape. The damper 40 and the ring body 31 are coupled to each other by a bolt B fastened to three fastening holes 32 radially formed in the ring body 31. The front face of the ring body 31 is in close contact with the rear end of the outer ring 45 of the damper 40 and the rear face of the ring body 31 is connected to the pulley 10 when the buffer bracket 30 is coupled to the pulley 10 10 is spaced apart from the distal end face 17 by a predetermined distance.

A fixing piece 33 is formed to protrude toward the pulley 10 at a position where the fastening hole 32 of the ring body 31 is formed. The fixing piece 33 is inserted into the insertion hole 15 of the pulley 10 and supports the buffering portion 35 surrounding the fixing piece 33. As shown in FIG. 3, a bent portion 34 is formed at the end of the fixing piece 33 to firmly hold the coupling portion 35 with the buffering portion 35. The bending portion 34 is formed by a force acting in a tangential direction of the ring body 31 along the rotation of the pulley 10 (a force acting in a direction perpendicular to the end surface of the fixing piece 33 in Fig. 3) .

In the present embodiment, the bent portion 34 is formed such that the end of the fixing piece 33 is bent toward the center of the pulley 10. However, the present invention is not limited to this, and the bending portion 34 may have a shape increasing the cross-sectional area of the fixing piece 33 or a shape increasing the contact area between the fixing piece 33 and the buffer portion 35. For example, the fixing piece 33 may be formed in a wavy pattern, or the end of the fixing piece 33 may be wound several times.

The shock absorbing part 35 is formed to surround the fixing piece 33 and inserted and fixed in the insertion hole 15 to absorb shock between the pulley 10 and the damper 40. In the present embodiment, the buffer 35 is formed of a material that can be elastically deformed, and may be formed of, for example, a rubber material. At the end of the buffer 35 is formed a latching protrusion 36 which is hooked on the latching jaw 16 of the insertion hole 15. The buffering portion 35 is firmly fixed in the insertion hole 15 by hanging the latching protrusion 36 on the latching jaw 16.

The cushioning bracket 30 is fixed to the pulley 10 by the cushioning portion 35 and the portion excluding the cushioning portion 35, that is, the ring body 31 and the fixing piece 33, . This is to prevent collision between the pulley 10 and the damper 40 fastened to the buffer bracket 30.

The damper 40 absorbs shocks caused by a change in the torque of the compressor and includes an inner ring 41 and an outer ring 45 and a shock absorbing part 45 inserted between the inner ring 41 and the outer ring 45. [ (48).

The inner ring 41 is connected to the limiter 50, which will be described below, and is formed in a substantially ring shape as shown in FIG. A coupling hole 43 is formed in the inner ring 41 and a fastener such as a rivet R is passed through the coupling hole 43 to allow the limiter 50 and the inner ring 41 to be coupled.

The outer ring 45 is provided to surround the inner ring 41 at a predetermined distance. The outer ring 45 is coupled with the cushion bracket 30. To this end, the outer ring 45 is formed with a fastening hole 46 corresponding to the fastening hole 32 of the cushioning bracket 30, A fastener such as a bolt (B) is fastened to the fastening hole (46).

The shock absorbing part 48 provided between the inner ring 41 and the outer ring 45 is made of rubber and is injection-molded between the inner ring 41 and the outer ring 45. Of course, the impact absorbing portion 48 is not necessarily made of a rubber material, but may be any other suitable material having elasticity.

When the outer ring 45 of the damper 40 is coupled to the cushion bracket 30, the rear end of the damper 40 is separated from the seating portion 11 and the end surface 17 of the pulley 10 And there is no portion where the damper 40 and the pulley 10 are in direct contact with each other.

A limiter (50) is coupled to the inner ring (41) of the damper (40). The limiter 50 serves to break the power transmission between the pulley 10 and the hub 60, which will be described below, when the breaking portion 55 is broken when a torque greater than a set value is generated in the compressor.

Meanwhile, the hub 60 is coupled to the limiter 50. The hub 60 is for transmitting rotational force of the pulley 10 to the rotary shaft of the compressor and may be screwed to the limiter 50.

Hereinafter, the operation of the power transmission device of the compressor according to the present invention will be described in detail.

First, the coupling state of the damper 40, the shock absorbing bracket 30, and the pulley 10 constituting the power transmission device of the compressor according to the present invention will be described.

The damper 40 is engaged with the cushioning bracket 30 by the bolts B fastened to the ring body 31 of the outer ring 45 and the cushioning bracket 30 in this embodiment. The cushioning portion 35 of the cushioning bracket 30 is inserted and fixed in the insertion hole 15 of the pulley 10. 3, the cushioning bracket 30 is fixed in a state of being apart from the pulley 10 except for the cushioning portion 35 and there is no part to be in contact with each other. The rear end of the damper 40 located in the seating portion 11 of the pulley 10 is also spaced apart from the seating portion 11. [

Next, the power transmission process of the power transmission apparatus having such a configuration will be described.

The power transmission device of the compressor transmits the rotational force transmitted from the vehicle engine to the compressor so that the compressor is driven.

The rotational force transmitted from the engine to the pulley 10 is transmitted to the damper 40 coupled with the ring body 31 through the cushioning portion 35 of the cushioning bracket 30. Then, the damper 40 is rotated together with the pulley 10. At this time, the impact or vibration between the pulley 10 and the damper 40 is buffered by the buffer 35 at first. In addition, since the pulley 10 and the damper 40 are spaced apart from each other except for the buffer part 35, wear and noise due to the collision are prevented.

As the damper 40 is rotated, the limiter 50 connected to the damper 40 by the rivet R is rotated together with the damper 40. When the limiter 50 is rotated, the hub 60 connected to the limiter 50 is also rotated and the rotational force of the hub 60 is transmitted to the rotary shaft (not shown) of the compressor connected to the hub 60, Lt; / RTI >

If the rotation of the compressor rotation shaft is stopped due to the fixing of the compressor or the like, the rotation of the hub 60 to which the rotation shaft is connected is to be stopped, and the limiter 50 connected to the pulley 10 being rotated by the engine I want to continue to rotate.

That is, the limiter 50 coupled to the hub 60 is connected to the damper 40 even though the operation of the hub 60 can not be rotated due to stoppage. So that the limiter 50 tries to rotate. Accordingly, the limiter 50 is subjected to a strong torque in a direction opposite to the rotation direction of the pulley 10.

This torque causes the limiter 50 to break so that the connection between the limiter 50 and the pulley 10 is released so that the power transmission is shut off and consequently the pulley 10 is rotated by the hub 60 So as to prevent damage to the belt that electrically connects the engine and the pulley 10 to each other.

At this time, a change in the torque of the engine is transmitted to a pulley 10 connected by the engine and the belt. This torque change is transmitted to the buffer (30) of the shock absorbing bracket 30 connecting the damper 40 and the pulley 10 35 of the damper 40 and the shock absorbing portion 48 of the damper 40.

The scope of the present invention is not limited to the embodiments described above, but may be defined by the scope of the claims, and those skilled in the art may make various modifications and alterations within the scope of the claims It is self-evident.

1 is an exploded perspective view showing a structure of a power transmission device of a compressor according to the prior art.

2 is an exploded perspective view showing a configuration of a preferred embodiment of a power transmission device for a compressor according to the present invention.

3 is a cross-sectional perspective view showing the internal structure of a power transmission device for a compressor according to an embodiment of the present invention.

Description of the Related Art [0002]

10: pulley 11: seat part

12: through hole 15: insertion hole

16: Jaw 20: Bearing

30: buffer bracket 31: ring body

32: fastening hole 33:

34: bending section 35: buffer section

36: stopper 40: damper

41: Inner ring 43:

45: outer ring 46: fastening hole

48: shock absorber 50: limiter

60: hub B: bolt

R: Rivet

Claims (4)

A pulley 10 rotated by a driving force transmitted from an engine, A damper 40 for absorbing an impact of a torque change transmitted from the rotary shaft of the compressor while rotating together with the pulley 10, A limiter 50 for preventing the drive force of the engine from being transmitted to the rotary shaft when the damper 40 is coupled and rotated together and the compressor is damaged by a torque exceeding a set value, And a hub (60) connected to the limiter (50) and the rotary shaft to transmit the rotational force of the limiter (50) to the rotary shaft, the power transmission device comprising: And a buffer bracket 30 provided between the pulley 10 and the damper 40 and having one side made of an elastic material and fixed to the pulley 10 and the other side coupled to the damper 40, The cushioning bracket (30) A ring body 31 coupled to the damper 40 and spaced apart from the pulley 10, A fixing piece 33 extending from one side of the ring body 31 toward the pulley 10 and inserted into the insertion hole 15 of the pulley 10, And a shock absorber (35) formed to surround the fixing piece (33) and inserted and fixed in the insertion hole (15) and made of an elastic material to absorb impact. delete The shock absorber according to claim 1, wherein a latching protrusion (36) formed at an end of the buffering portion (35) is hooked on a latching jaw (16) formed stepwise inside the insertion hole (15) Of the compressor (1). 4. The compressor according to claim 1 or 3, wherein a bent portion (34) is formed at an end of the fixing piece (33) so as to firmly engage with the buffer portion (35) .

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