KR20150109629A - Assembly device for pulley in clutchless compressor - Google Patents

Abstract

A pulley assembling device for a clutchless compressor is disclosed. The present invention excludes an excessive compression effect of a rotational shaft accompanied by accumulated tolerance generated in an assembling portion between a pulley installed to idle with respect to a housing of a compressor and a limit assembly directly coupled to the rotational shaft of the compressor. Therefore, the present invention prevents degradation of operation performance of the compressor and restrains an abnormal noise. The pulley assembling device for a clutchless compressor as described above comprises: the limit assembly (20) coupled with the pulley (10) to be installed to transmit a driving force received from the pulley (10) to the rotational shaft (30); a damper (60) inserted into an assembly hole (12) of the pulley (10) to couple the pulley (10) and the limit assembly (20); and a holder (70) inserted into the assembly hole (62) of the damper (60) to be coupled to each other by means of the limit assembly (64) and the bolt (80). The damper (60) has a protrusion end part (64) protruding to the outside formed in a circumference of the assembly hole (62) to set an available space (S) for axial deformation between the holder (70) and a flange (72).

Description

Technical Field [0001] The present invention relates to a clutchless compressor,

The present invention relates to an apparatus for assembling a pulley of a clutchless compressor, and more particularly, to a pulley assembly apparatus for a pulley assembly of a clutchless compressor, The present invention relates to a pulley assembling apparatus for a clutchless compressor which can prevent a reduction in the operating performance of the compressor and suppress the occurrence of abnormal noise by eliminating excessive pressing of the rotating shaft caused by cumulative tolerances occurring in the region.

2. Description of the Related Art Generally, compressors for compressing a refrigerant in a vehicle cooling system have been developed in various forms. In such a compressor, there are a reciprocating type in which a refrigerant is compressed and a reciprocating type in which a refrigerant is compressed, There is a rotary that performs.

The reciprocating compressor includes a crank type in which a driving force of a drive source is transmitted to a plurality of pistons using a crank, a swash plate type in which a swash plate is transmitted, and a wobble plate type in which a wobble plate is used. A vane rotary type using a rotary shaft and a vane, and a scroll type using a revolving scroll and a fixed scroll.

The swash plate type compressor includes a fixed displacement type in which the installation angle of the swash plate is fixed and a variable displacement type in which the discharge displacement can be changed by changing the inclination angle of the swash plate. Since the compressor is driven by receiving the power from the rotational force of the automobile engine, the fixed capacity type compressor includes an electromagnetic clutch in the power transmission system to control the operation of the compressor. However, in the case of a compressor equipped with an electromagnetic clutch, the number of engine revolutions of the vehicle flows at the time of driving or at the time of stop, thereby obstructing the stable operation of the vehicle.

Accordingly, in the prior art, the swash plate is always rotated with driving of the engine without a clutch capable of interrupting the transmission of the power, and the inclination angle of the swash plate is interlocked with the rotation speed of the engine to change the discharge capacity of the refrigerant variably A variable capacity type swash plate type compressor is mainly used.

On the other hand, in recent years, a clutchless compressor has been proposed, which can protect the compressor by artificially interrupting the path of the power transmission system for protecting the compressor when the torque supplied to the compressor from the outside is excessive, The configuration of the power transmission system is as shown in Fig.

Referring to FIG. 1, a conventional clutchless compressor includes a pulley 10, a limit assembly 20 coupled to the pulley 10, a driving force externally provided through the limit assembly 20, A front housing 40 of a compressor for idly rotating the pulley 10 and a bearing 30 for supporting the pulley 10 idly rotatably with respect to the front housing 40. [ 50).

FIG. 2 is a perspective view illustrating various fastening parts for coupling the limit assembly 20 to the pulley 10 in the power transmission system of the clutchless compressor shown in FIG. 2, the fastening part includes a damper 60 and a holder 70, a bolt 80, and a rivet 82 as a part for coupling the pulley 10 and the limit assembly 20 .

The limit assembly 20 includes a cover plate 22 directly attached to a pulley 10, that is, a web of the pulley 10, a cover plate 22 and a rivet 82 And a cylindrical limit 24 coupled to the rotary shaft 30 of the compressor.

The damper 60 is made of a rubber-like shock-absorbing material that is inserted into the hole 12 of the pulley 10 to relieve an impact generated in the radial direction.

The holder 70 is inserted into the assembly hole 62 of the damper 60 and is coupled to the cover plate 22 of the limit assembly 20 through the bolt 80 to connect the pulley 10 and the limit assembly (20). ≪ / RTI > The holder 70 integrally protrudes from the flange 72 and is inserted into the assembly hole 62 of the damper 60. The holder 70 is inserted into the hole 62 of the damper 60, And a cylindrical collar 74 which forms a threaded portion on the inner circumferential surface so as to be screwed on the cylindrical portion 80.

FIG. 3 is a cross-sectional view schematically showing a partially enlarged joint between a pulley and a limit assembly in a power transmission system of the clutchless compressor shown in FIG. 1. FIG. Referring to FIG. 3, in the power transmission system of the clutchless compressor, since the assembled portion between the pulley 10 and the limit assembly 20 has a structure in which various components are coupled together, Inevitably accompanies cumulative tolerances at the assembly sites between the two.

The cumulative tolerance occurring at the assembled portion of such components may cause excessive torque when the damper 60, the holder 70, and the bolt 80 are used to fasten the pulley 10 and the limit assembly 20 between the pulley 10 and the limit assembly 20, The damper 60 in the assembly hole 12 of the pulley 10 is deformed in an irregular direction and irregular deformation of the damper 60 is caused by a problem of shifting the center of rotation of the pulley 10 relative to the rotary shaft 30 So that the operation performance of the compressor is largely lowered and the abnormal noise is generated.

As a result, in the conventional clutchless compressor, the fastening to the assembled portion between the pulley 10 and the limit assembly 20 is a difficult process requiring consideration of the concentricity between the pulley 10 and the rotary shaft 30, The quality of the assembly is determined depending on the quality of the assembly.

Korean Patent Publication No. 10-2005-0080522, a power transmission device of a clutchless compressor

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a compressor which is capable of idling with respect to a front housing located in front of a cylinder block of a compressor, The excessive compression of the rotary shaft caused by the cumulative tolerance occurring at the assembly portion between the limit assembly that is directly coupled to the rotary shaft that rotates through the driving force and compresses the refrigerant to the high pressure and is damaged when the excessive torque is transmitted from the outside, And it is an object of the present invention to provide an apparatus for assembling a pulley of a clutchless compressor, which can prevent the occurrence of abnormal noise while preventing deterioration of the operating performance of the compressor.

According to an aspect of the present invention, there is provided a limit assembly including a limit assembly coupled to a pulley to transmit a driving force provided from the pulley to a rotary shaft, a damper inserted into an assembly hole of the pulley for engagement between the pulley and the limit assembly, And a holder inserted into an assembly hole of the damper and coupled to the limit assembly via a bolt, wherein the damper includes a protruding end protruding outwardly around the assembly hole, And a clearance space for axial deformation is formed between the flange and the flange of the holder, and the protruding end portion is formed so as to protrude outwardly concentrically over the entire circumference of the assembly hole.

According to another embodiment of the present invention, there is provided a limit assembly, comprising: a limit assembly coupled to a pulley to transmit a driving force provided from the pulley to a rotary shaft; a damper inserted into an assembly hole of the pulley for engagement between the pulley and the limit assembly; And a holder inserted into an assembly hole of the damper and coupled to the limit assembly via a bolt, wherein the holder has a protruding end protruding outward from one surface of the flange, And a protruding end portion protruding outwardly concentrically from the one side of the flange over the entire circumference of the collar.

According to another embodiment of the present invention, there is provided a limit assembly, comprising: a limit assembly coupled to a pulley to transmit a driving force provided from the pulley to a rotary shaft; a damper inserted into an assembly hole of the pulley for engagement between the pulley and the limit assembly; And a holder inserted into an assembly hole of the damper and coupled to the limit assembly through a bolt, wherein the damper includes a recessed portion that is recessed inwardly from one surface of the pulley toward an assembly hole of the clutchless compressor, And a clearance space for axial deformation is formed between the pulley and the contact surface inside the assembly hole of the pulley, and the recess is formed in a concave form over the entire circumference of the assembly hole of the damper.

According to another embodiment of the present invention, there is provided a limit assembly, comprising: a limit assembly coupled to a pulley to transmit a driving force provided from the pulley to a rotary shaft; a damper inserted into an assembly hole of the pulley for engagement between the pulley and the limit assembly; And a holder inserted into an assembly hole of the damper and coupled to the limit assembly via a bolt, wherein the pulley includes a concave portion that is recessed inward from one surface of the pulley toward the damper, And a clearance space for axial deformation is formed between the pulley and the contact surface, and the concave portion is formed in a concave shape with respect to the seating surface on the bottom surface of the assembly hole of the pulley.

The pulley assembly device of the clutchless compressor according to the present invention comprises a pulley mounted idly rotatably with respect to a front housing disposed in front of a cylinder block of the compressor and provided with driving force from the outside, A clearance space in the axial direction toward the rotary shaft of the compressor is provided between the parts located at the assembly part between the limit assembly that is directly coupled to the rotary shaft that rotates and compresses the refrigerant to the high pressure and is damaged when the excessive torque is transmitted from the outside to protect the compressor It is possible to eliminate the excessive pressing of the rotary shaft due to excessive fastening at the fastening portion due to the cumulative tolerance of the components occurring at the assembled portion between the pulley and the limit assembly.

As a result, according to the present invention, it is possible to eliminate an excessive pressing phenomenon of the rotary shaft through the setting of the axial clearance space provided at the assembly portion between the pulley of the compressor and the limit assembly, so that the operation performance of the compressor can be prevented from being lowered And an abnormal noise generated during operation of the compressor can be remarkably reduced.

1 is a cross-sectional view schematically showing a partially enlarged configuration of a power transmission system of a conventional clutchless compressor.
FIG. 2 is a perspective view showing a coupling part for coupling a limit assembly to a pulley in the power transmission system of the clutchless compressor shown in FIG. 1; FIG.
FIG. 3 is a cross-sectional view schematically showing a partially enlarged joint between a pulley and a limit assembly in a power transmission system of the clutchless compressor shown in FIG. 1. FIG.
FIG. 4 is a schematic cross-sectional view of a clutchless compressor according to a first embodiment of the present invention, in which only a fastening portion between a pulley and a limit assembly is partially enlarged.
5 is a perspective view showing in detail the structure of the damper shown in Fig.
FIG. 6 is a cross-sectional view schematically showing a partially enlarged joint between a pulley and a limit assembly in a clutchless compressor according to a second embodiment of the present invention. FIG.
7 is a perspective view showing in detail the structure of the holder shown in Fig.
FIG. 8 is a cross-sectional view schematically showing only a joint portion between a pulley and a limit assembly in a clutchless compressor according to a third embodiment of the present invention. FIG.
9 is a perspective view showing in detail the structure of the damper shown in Fig.
FIG. 10 is a cross-sectional view schematically showing an enlarged view of only a fastening portion between a pulley and a limit assembly in a clutchless compressor according to a fourth embodiment of the present invention. FIG.
Fig. 11 is a perspective view showing in detail the configuration of the pulley shown in Fig. 10; Fig.

Hereinafter, preferred embodiments of a pulley assembling apparatus for a clutchless compressor according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

Further, the terms to be described below are defined in consideration of the functions of the present invention, which may vary according to the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

Prior to the detailed description of the embodiments of the present invention, the overall engagement relationship between the pulley and the limit assembly of the clutchless compressor and the construction for fastening components therefor will be described with reference to FIGS. 1 to 3 The same reference numerals are used for the parts.

- First Embodiment

FIG. 4 is a cross-sectional view schematically showing only a coupling part between a pulley and a limit assembly in a clutchless compressor according to a first embodiment of the present invention, FIG. 5 is a view showing the structure of the damper shown in FIG. Fig.

Referring to FIGS. 4 and 5, the pulley 10 is installed to idle through a bearing 50 with respect to the front housing 40 of the compressor. The pulley 10 forms a number of assembly holes 12 (see Fig. 2) radially from the center of rotation. The assembly hole 12 has an outer shape having a curved curvature in an arc shape and has a predetermined thickness, and inserts a damper 60 for buffering a load acting in a radial direction. The damper 60 penetrates the member to form an assembly hole 62 for insertion of the holder 70. [ The holder 70 is inserted into the assembly hole 62 of the damper 60 and is coupled to the cover plate 22 of the limit assembly 20 through the bolt 80 to be engaged with the pulley 10 and the limit assembly 20 ). ≪ / RTI >

The holder 70 integrally protrudes from the flange 72 and is inserted into the assembly hole 62 of the damper 60. The flange 72 is inserted into the hole 62 of the damper 60, And a cylindrical collar 74 which forms a threaded portion on the inner circumferential surface so as to be screwed with the bolt 80.

In this case, the damper 60 integrally forms a protruding end portion 64 projecting outwardly concentrically from the front periphery of the assembly hole 62. The damper 60 includes a pair of latching protrusions 66 protruding radially from the periphery of the assembling hole 62 to receive the flange 72 of the holder 70 therein Respectively.

When the cover plate 22 of the limit assembly 20 is fastened to the pulley 10 via the damper 60 and the holder 70 and the bolts 80, A protruding end portion 64 projecting outward from the front of the hole 62 forms a predetermined clearance S between the flange 72 of the holder 70 and the collar 74.

At this time, the clearance S can act as a space allowing the axial deformation of the damper 60 at the coupling portion between the damper 60 and the holder 70.

As a result, when the bolt 80 is excessively fastened to the collar 74 of the holder 70 due to the cumulative tolerance of the components involved in the assembly part between the pulley 10 and the limit assembly 20 The deformation of the damper 60 can be absorbed through the clearance space S so that the center of rotation of the pulley 10 relative to the rotary shaft 30 can be maintained without being shifted.

- Embodiment 2

6 is a cross-sectional view schematically showing only a joint portion between a pulley and a limit assembly in a clutchless compressor according to a second embodiment of the present invention. FIG. 7 is a cross- Fig.

Referring to FIGS. 6 and 7, the pulley 10 is idly mounted to the front housing 40 of the compressor via a bearing 50. The pulley 10 forms a number of assembly holes 12 (see Fig. 2) radially from the center of rotation. The assembly hole 12 has an outer shape having a curved curvature in an arc shape and has a predetermined thickness, and inserts a damper 60 for buffering a load acting in a radial direction. The damper 60 penetrates the member to form an assembly hole 62 for insertion of the holder 70. [ The holder 70 is inserted into the assembly hole 62 of the damper 60 and is coupled to the cover plate 22 of the limit assembly 20 through the bolt 80 to be engaged with the pulley 10 and the limit assembly 20 ). ≪ / RTI >

The holder 70 integrally protrudes from the flange 72 and is inserted into the assembly hole 62 of the damper 60. The flange 72 is inserted into the hole 62 of the damper 60, And a cylindrical collar 74 which forms a threaded portion on the inner circumferential surface so as to be screwed with the bolt 80.

In the second embodiment of the present invention, the holder 70 integrally forms a protruding end portion 76 which protrudes outward in a concentric manner over the entire circumference of the collar 74 on one side of the flange 72.

When the cover plate 22 of the limit assembly 20 is fastened to the pulley 10 via the damper 60 and the holder 70 and the bolts 80, The protruding end 76 protruding outward from the front periphery of the collar 74 on one side of the flange 72 forms a predetermined clearance S between the one side of the damper 60 and the contact surface.

At this time, the clearance S can act as a space allowing the axial deformation of the damper 60 at the coupling portion between the damper 60 and the holder 70.

As a result, when the bolt 80 is excessively fastened to the collar 74 of the holder 70 due to the cumulative tolerance of the components involved in the assembly part between the pulley 10 and the limit assembly 20 The deformation of the damper 60 can be absorbed through the clearance space S so that the center of rotation of the pulley 10 relative to the rotating shaft 30 can be maintained without concentricity.

- Third Embodiment

FIG. 8 is a cross-sectional view schematically showing only a joint part between a pulley and a limit assembly in a clutchless compressor according to a third embodiment of the present invention. FIG. 9 is a cross- Fig.

Referring to FIGS. 8 and 9, the pulley 10 is installed to idle through a bearing 50 with respect to the front housing 40 of the compressor. The pulley 10 forms a number of assembly holes 12 (see Fig. 2) radially from the center of rotation. The assembly hole 12 has an outer shape having a curved curvature in an arc shape and has a predetermined thickness, and inserts a damper 60 for buffering a load acting in a radial direction. The damper 60 penetrates the member to form an assembly hole 62 for insertion of the holder 70. [ The holder 70 is inserted into the assembly hole 62 of the damper 60 and is coupled to the cover plate 22 of the limit assembly 20 through the bolt 80 to be engaged with the pulley 10 and the limit assembly 20 ). ≪ / RTI >

The holder 70 integrally protrudes from the flange 72 and is inserted into the assembly hole 62 of the damper 60. The flange 72 is inserted into the hole 62 of the damper 60, And a cylindrical collar 74 which forms a threaded portion on the inner circumferential surface so as to be screwed with the bolt 80.

In the third embodiment of the present invention, the damper 60 includes a recessed portion 68 (see FIG. 1) recessed inwardly in the entire circumference of the assembly hole 62 on one side of the pulley 10 toward the assembly hole 12 ).

When the cover plate 22 of the limit assembly 20 is fastened to the pulley 10 via the damper 60 and the holder 70 and the bolt 80, The recessed grooves 68 recessed in the entire circumference of the assembly hole 62 form a predetermined clearance space S with the contact surface in the assembly hole 12 of the pulley 10 .

At this time, the clearance S can act as a space allowing the axial deformation of the damper 60 at the coupling portion between the damper 60 and the holder 70.

As a result, when the bolt 80 is excessively fastened to the collar 74 of the holder 70 due to the cumulative tolerance of the components involved in the assembly part between the pulley 10 and the limit assembly 20 The deformation of the damper 60 can be absorbed through the clearance space S so that the center of rotation of the pulley 10 relative to the rotating shaft 30 can be maintained without concentricity.

- Fourth Embodiment

FIG. 10 is a cross-sectional view schematically showing only a part of engagement between a pulley and a limit assembly in a clutchless compressor according to a fourth embodiment of the present invention, FIG. 11 is a cross- Fig.

Referring to FIGS. 10 and 11, the pulley 10 is mounted to the front housing 40 of the compressor through a bearing 50 so as to idle. The pulley 10 forms a number of assembly holes 12 (see Fig. 2) radially from the center of rotation. The assembly hole 12 has an outer shape having a curved curvature in an arc shape and has a predetermined thickness, and inserts a damper 60 for buffering a load acting in a radial direction. The damper 60 penetrates the member to form an assembly hole 62 for insertion of the holder 70. [ The holder 70 is inserted into the assembly hole 62 of the damper 60 and is coupled to the cover plate 22 of the limit assembly 20 through the bolt 80 to be engaged with the pulley 10 and the limit assembly 20 ). ≪ / RTI >

The holder 70 integrally protrudes from the flange 72 and is inserted into the assembly hole 62 of the damper 60. The flange 72 is inserted into the hole 62 of the damper 60, And a cylindrical collar 74 which forms a threaded portion on the inner circumferential surface so as to be screwed with the bolt 80.

In the fourth embodiment of the present invention, the pulley 10 has a recessed portion 18 inwardly recessed in a portion facing the one surface of the damper 60 from the seating surface 16 formed in the assembly hole 12, . The pulley 10 also has an insertion hole 14 for allowing the holder 70 to be inserted into the collar 74 in the form of a member penetrating the center of the assembly hole 12.

Accordingly, when the cover plate 22 of the limit assembly 20 is fastened to the pulley 10 via the damper 60, the holder 70 and the bolts 80, the assembly of the pulley 10 The recessed groove portion 18 concaved with respect to the seating seating surface 16 located at the bottom of the hole 12 forms a predetermined clearance space S with the contact surface of one side of the damper 60.

At this time, the clearance S can act as a space allowing the axial deformation of the damper 60 at the coupling portion between the damper 60 and the holder 70.

As a result, when the bolt 80 is excessively fastened to the collar 74 of the holder 70 due to the cumulative tolerance of the components involved in the assembly part between the pulley 10 and the limit assembly 20 The deformation of the damper 60 can be absorbed through the clearance space S so that the center of rotation of the pulley 10 relative to the rotating shaft 30 can be maintained without concentricity.

Therefore, the present invention is characterized in that, at the assembling position between the pulley 10 and the limit assembly 20, between the holder 70 and the holder 70 by the protruding end portion 64 formed at the front periphery of the assembling hole 62 at one side of the damper 60 A clearance S between the damper 60 and the protruding end 76 formed at the front end portion of the collar 74 of the holder 70; A clearance space S between the seating surface 16 of the assembly hole 12 of the pulley 10 by the recessed portion 68 formed in the front periphery of the hole 62, The axial deformation of the damper 60 due to at least one of the structural features of the damper 60 and the clearance space S between the damper 60 and the recessed portion 18 formed in the seating surface 16 within the recessed portion 12 It is possible to prevent the excessive engagement due to the cumulative tolerance of the components occurring at the assembly site between the pulley 10 and the limit assembly 20 It can be positively excluded than the depression symptoms of a rotary shaft 30, through which it is possible to prevent the operating performance of the compressor, and significantly reduce the occurrence of abnormal noise.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the particular details of the embodiments set forth herein. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

10 - Pulley 12 - Assembly hole
14 - Insertion hole 16 - Seated seat
18-Nose groove 20-Limit assembly
22-Cover Plate 24-Limit
30-Rotary shaft 40-Front housing
50-bearing 60-damper
62- Assembly hole 64- projecting end
66-stop jaw 68-yo groove
70-Holder 72-Flange
74-collar 76-protruding end
80-bolt 82-rivet

Claims (8)

A limit assembly 20 coupled to the pulley 10 and configured to transmit a driving force provided from the pulley 10 to the rotary shaft 30; a limit assembly 20 mounted to the pulley 10 for coupling between the pulley 10 and the limit assembly 20; A damper 60 inserted into the assembly hole 12 of the damper 60 and a holder inserted into the assembly hole 62 of the damper 60 and coupled to the limit assembly 20 via the bolt 80 70), characterized in that:
The damper 60 has a protruding end portion 64 protruding outward around the assembly hole 62 so that a clearance S for axial deformation is formed between the damper 60 and the flange 72 of the holder 70. [ Wherein the first and second pulleys form a pulley assembly of the clutchless compressor. The method according to claim 1,
Wherein the projecting end portion (64) is formed to protrude outwardly concentrically over the entire circumference of the assembling hole (62). A limit assembly 20 coupled to the pulley 10 and configured to transmit a driving force provided from the pulley 10 to the rotary shaft 30; a limit assembly 20 mounted to the pulley 10 for coupling between the pulley 10 and the limit assembly 20; A damper 60 inserted into the assembly hole 12 of the damper 60 and a holder inserted into the assembly hole 62 of the damper 60 and coupled to the limit assembly 20 via the bolt 80 70), characterized in that:
The holder 70 has a protruding end 76 protruding outward from one side of the flange 72 to form a clearance S for axial deformation between the protruding end 76 and the contact surface of the damper 60 Wherein the pulley assembly device of the clutchless compressor is characterized by comprising: The method of claim 3,
Wherein the projecting end portion (76) is formed to protrude outwardly concentrically from the one side of the flange (72) over the entire circumference of the collar (74). A limit assembly 20 coupled to the pulley 10 and configured to transmit a driving force provided from the pulley 10 to the rotary shaft 30; a limit assembly 20 mounted to the pulley 10 for coupling between the pulley 10 and the limit assembly 20; A damper 60 inserted into the assembly hole 12 of the damper 60 and a holder inserted into the assembly hole 62 of the damper 60 and coupled to the limit assembly 20 via the bolt 80 70), characterized in that:
The damper 60 has a recessed portion 68 recessed inwardly from one side of the pulley 10 toward the assembly hole 12 so as to be in contact with the contact surface in the assembly hole 12 of the pulley 10 And forms a clearance space (S) for axial deformation of the pulley. The method of claim 5,
Wherein the recessed portion (68) is formed in a concave shape on a front portion of an assembling hole (62) of the damper (60). A limit assembly 20 coupled to the pulley 10 and configured to transmit a driving force provided from the pulley 10 to the rotary shaft 30; a limit assembly 20 mounted to the pulley 10 for coupling between the pulley 10 and the limit assembly 20; A damper 60 inserted into the assembly hole 12 of the damper 60 and a holder inserted into the assembly hole 62 of the damper 60 and coupled to the limit assembly 20 via the bolt 80 70), characterized in that:
The pulley 10 has a recessed portion 18 recessed inwardly from one surface toward the damper 60 to form a clearance space S for axial deformation between the pulley 10 and one contact surface of the damper 60 Wherein the first and second pulleys are connected to each other. The method of claim 7,
Wherein the recessed portion is formed in a concave shape with respect to a seating seating surface located on a bottom surface of the assembly hole of the pulley.

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