JP6439643B2 - Fixing method of elastic material and fixing structure and clutch assembling method - Google Patents

Description

  The present invention relates to a fixing method of an elastic material provided in a piston retainer interposed between a piston arm and a clutch, and a fixing structure and a clutch assembling method.

  2. Description of the Related Art Conventionally, there has been known a driving force transmission device including a multi-plate dry clutch, a piston and a piston arm for fastening the multi-plate dry clutch, and a bellows seal member having a piston retainer that defines a clutch chamber and a hydraulic actuator chamber. (For example, refer to Patent Document 1).

JP 2013-29199 A

  However, the conventional apparatus has a structure in which the tip of the piston arm and the clutch plate of the multi-plate dry clutch are in contact with each other via a piston retainer included in the bellows seal member. For this reason, when the friction force of the multi-plate dry clutch is slid and fastened by a large pressing force, if the μ-V characteristic of the multi-plate dry clutch has a negative gradient, the self-excited vibration in which the eigenmode of the piston arm structure diverges. And this self-excited vibration becomes a source of excitation, and there is a problem in that a radiated sound is generated that makes the passenger feel uncomfortable.

  In order to solve this problem, the present applicant has previously proposed a solution in which a positive damping imparting member is interposed between the arm tip of the piston arm and the arm press-fitting recess of the piston retainer (application number: Japanese Patent Application). 2015-125013). However, when a positive damping imparting member is interposed, if the fixing force of the positive damping imparting member to the arm press-fitting recess of the piston retainer is weak, the piston retainer is detached from the piston retainer when performing the work of assembling the piston retainer to the piston arm. There remains a problem that the member may fall off.

  The present invention has been made paying attention to the above problems, and prevents the elastic material from falling off the piston retainer without increasing the number of parts or processing man-hours when the piston retainer is assembled to the piston arm. It is an object of the present invention to provide an elastic material fixing method and a fixing structure and clutch assembling method.

In order to achieve the above object, the present invention is a method for fixing an elastic material included in a piston retainer interposed between a piston arm and a clutch.
The piston retainer includes an arm press-fitting recess having a press-fitting surface for press-fitting the arm tip of the piston arm on the inner diameter side or the outer diameter side.
The elastic material is formed to protrude partially or entirely in the radial direction from the surface facing the press-fitting surface among the annular elastic body portion and the inner peripheral surface or outer peripheral surface of the elastic main body portion. A radial protrusion, and has the following temporary fixing procedure, pushing-in procedure, and fixing procedure.
In the temporary fixing procedure, when an elastic material is inserted into the arm press-fitting recess of the piston retainer, the elastic material is temporarily fixed by a fixing force generated by elastic deformation of the radial protrusion due to a diameter difference from the press-fitting surface.
In the pushing-in procedure, when the arm press-fitting recess is press-fitted into the arm tip of the piston arm, the elastic material contacts the tip of the arm, and then the elastic material is pushed toward the bottom of the arm press-fit recess.
In the fixing procedure, the elastic material is fixed to a gap position between the bottom surface of the arm press-fitting recess formed by press-fitting the arm press-fitting recess to the arm tip of the piston arm.

Therefore, when the elastic material is inserted into the arm press-fitting recess of the piston retainer, the elastic material is temporarily fixed by a fixing force generated by elastic deformation of the radial protrusion due to the difference in diameter from the press-fitting surface.
That is, when the piston retainer is assembled to the piston arm, the piston retainer having an elastic body assembled in advance is press-fitted and fixed to the tip end portion of the piston arm. Therefore, in order to prevent the elastic body from falling off from the piston retainer during the assembling work, it is necessary to take measures to prevent the elastic body from falling off from the arm press-fitting recess of the piston retainer.
On the other hand, the press-fitting surface of the piston retainer in the arm press-fitting recess is a surface having a high dimensional accuracy with a small allowable tolerance so as to ensure press-fitting to the arm tip regardless of component variations. Paying attention to this point, the press-fitting surface of the arm press-fitting recess is used as a temporary fixing surface of the elastic body so that the radial projection formed on the elastic material is temporarily fixed by a fixing force generated by elastic deformation. did. In this way, in the temporary fixing procedure, the amount of elastic deformation (= fixing force) of the radial protrusion is stabilized by using the press-fitting surface of the arm press-fitting recess as a temporary fixing surface, and the elastic material is pressed into the arm of the piston retainer. The release from the recess is suppressed.
As a result, when the piston retainer is assembled to the piston arm, the elastic material can be prevented from coming off the piston retainer and falling off without increasing the number of parts and the number of processing steps.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall schematic diagram showing a hybrid driving force transmission device to which a clutch damping material fixing method and fixing structure and clutch assembling method of Example 1 are applied. It is sectional drawing which shows the structure of the motor & clutch unit in the hybrid driving force transmission apparatus with which the fixing method and fixing structure of the clutch damping material of Example 1 and the assembly method of the clutch were applied. It is a disassembled perspective view which shows the clutch fastening structure to which the fixing structure of the clutch damping material of Example 1 was applied. It is a disassembled side view which shows the clutch fastening structure to which the fixing structure of the clutch damping material of Example 1 was applied. It is sectional drawing which shows the bellows seal member which has a piston retainer in the clutch fastening structure to which the fixing structure of the clutch damping material of Example 1 was applied. It is a decomposition | disassembly expanded sectional view which shows the detailed structure of the piston arm to which the fixing structure of the clutch damping material of Example 1 was applied, a piston retainer, and a clutch damping material. It is a mode shape figure which shows the natural mode of a piston arm when self-excited vibration generate | occur | produces in a comparative example. It is a time chart which shows the experimental result of a radiation sound characteristic when self-excited vibration generate | occur | produces at the time of engine starting in a comparative example. 3 is a time chart showing experimental results of radiation sound characteristics when the engine of Example 1 is started. It is a fixing method explanatory drawing which shows the temporary fixing procedure in the fixing method of the clutch damping material of Example 1. FIG. It is a fixing method explanatory drawing which shows the pushing-in procedure in the fixing method of the clutch damping material of Example 1. FIG. It is a fixing method explanatory drawing which shows the fixing procedure in the fixing method of the clutch damping material of Example 1. FIG. It is an assembly method explanatory drawing which shows the subassembly procedure in the assembly method of the clutch of Example 1. FIG. It is an assembly method explanatory drawing which shows the piston retainer press-fitting procedure in the assembly method of the clutch of Example 1. It is an assembly method explanatory drawing which shows the clutch plate assembly | attachment procedure in the assembly method of the clutch of Example 1. FIG. It is the partial front view and sectional drawing which show the example of clutch damping materials other than Example 1. FIG.

  Hereinafter, the best mode for realizing the elastic material fixing method and the fixing structure and clutch assembling method of the present invention will be described based on Example 1 shown in the drawings.

First, the configuration will be described.
In the first embodiment, the clutch damping material (an example of an elastic material) is fixed and the fixing structure and the clutch are assembled by disposing a multi-plate dry clutch between the engine and the motor. The present invention is applied to a drive system of an FF hybrid vehicle that performs slip fastening control while sliding a friction surface. The configuration of the clutch damping material fixing structure according to the first embodiment will be described by dividing it into “the entire system configuration”, “the configuration of the motor and clutch unit”, “the clutch fastening structure”, and “the clutch damping material fixing structure”.

[Overall system configuration]
FIG. 1 shows a hybrid driving force transmission device to which the clutch damping member fixing method and fixing structure and clutch assembling method of the first embodiment are applied. The overall system configuration will be described below with reference to FIG.

  As shown in FIG. 1, the hybrid driving force transmission device includes an engine Eng, a motor & clutch unit M / C, and a transmission unit T / M. The motor & clutch unit M / C has one end connected to the engine output shaft 1 of the engine Eng and the other end connected to the transmission input shaft 5 of the transmission unit T / M. The clutch hub shaft 2, the clutch hub 3, the clutch drum shaft 4, the clutch drum 6, the multi-plate dry clutch 7 (dry clutch), the hydraulic piston mechanism 8, the motor / generator 9 (motor), Have The hydraulic piston mechanism 8 is a general term for a configuration that hydraulically controls engagement / release of the multi-plate dry clutch 7.

  In the hybrid driving force transmission device, the multi-plate dry clutch 7 that is normally open is released, thereby setting the “electric vehicle traveling mode” using only the motor / generator 9 as a driving source. When the engine Eng is started, the motor / generator 9 is used as a starter motor, and engine cranking is performed by slip engagement control that increases the pressing force while sliding the friction surface of the multi-plate dry clutch 7. Further, after the engine is started, the multi-plate dry clutch 7 is hydraulically engaged, so that a “hybrid vehicle travel mode” is performed using the engine Eng and the motor / generator 9 as drive sources. The engine output shaft 1 and the clutch hub shaft 2 are connected via a damper 20.

  The motor & clutch unit M / C includes a multi-plate dry clutch 7, a hydraulic piston mechanism 8, and a motor / generator 9 inside a front case 21. The multi-plate dry clutch 7 is connected to the engine Eng to connect and disconnect the driving force transmitted from the engine Eng. The hydraulic piston mechanism 8 hydraulically controls engagement / release of the multi-plate dry clutch 7. The motor / generator 9 is disposed at the outer peripheral position of the clutch drum 6 of the multi-plate dry clutch 7. The motor & clutch unit M / C is provided with a motor housing 81 having a first clutch pressure oil passage 85 to the hydraulic piston mechanism 8 while maintaining a sealing property by the O-ring 10.

  The motor / generator 9 is a synchronous three-phase AC motor, and includes a rotor support frame 91 provided integrally with the clutch drum 6, and a rotor 92 supported and fixed to the rotor support frame 91 and embedded with permanent magnets. Have. The stator 92 includes a stator 94 that is disposed on the rotor 92 via the air gap 93 and is fixed to the stator housing portion 97, and a stator coil 95 that is wound around the stator 94. The stator housing portion 97 is formed with a water jacket 96 for circulating cooling water.

  The transmission unit T / M is connected to the motor and clutch unit M / C, and includes a transmission case 41, a V-belt continuously variable transmission mechanism 42, and an oil pump O / P. The V-belt type continuously variable transmission mechanism 42 is built in the transmission case 41 and spans a V-belt between two pulleys to change the belt contact diameter to obtain a continuously variable transmission ratio. The oil pump O / P is a hydraulic pressure source that produces the hydraulic pressure to the necessary part. The oil pump pressure is used as the original pressure, and the oil pressure from the control valve (not shown) is used to regulate the shifting hydraulic pressure, clutch / brake hydraulic pressure, etc. Guide the hydraulic pressure to the required part. The transmission unit T / M is further provided with a forward / reverse switching mechanism 43, an oil tank 44, and an end plate 45.

  The oil pump O / P drives the pump by transmitting the rotational drive torque of the transmission input shaft 5 via a chain drive mechanism. The chain drive mechanism includes a drive-side sprocket 51 that rotates as the transmission input shaft 5 rotates, a driven-side sprocket 52 that rotates the pump shaft 57, and a chain 53 that spans both the sprockets 51 and 52. Have. The drive-side sprocket 51 is interposed between the transmission input shaft 5 and the end plate 45 and is rotatably supported via a bush 55 with respect to a stator shaft 54 fixed to the transmission case 41. Then, the rotational input torque from the transmission input shaft 5 is transmitted through the first adapter 56 that is engaged with the transmission input shaft 5 by spline fitting and the driving sprocket 51.

[Configuration of motor & clutch unit]
FIG. 2 shows the configuration of the motor and clutch unit in the hybrid driving force transmission apparatus to which the clutch damping member fixing method and fixing structure and clutch assembling method of the first embodiment of the first embodiment are applied. Hereinafter, the configuration of the motor and clutch unit M / C will be described with reference to FIG.

  The clutch hub 3 is connected to the engine output shaft 1 of the engine Eng. As shown in FIG. 2, the drive plate 71 of the multi-plate dry clutch 7 is held on the clutch hub 3 by spline connection.

  The clutch drum 6 is connected to the transmission input shaft 5 of the transmission unit T / M. As shown in FIG. 2, the driven plate 72 of the multi-plate dry clutch 7 is held on the clutch drum 6 by spline connection.

  The multi-plate dry clutch 7 is interposed between a clutch hub 3 and a clutch drum 6 of a driving force transmission system, and alternately has a drive plate 71 and a driven plate 72 with friction facings 73 and 73 attached to both surfaces. It is configured by arranging a plurality of sheets. That is, when the multi-plate dry clutch 7 is engaged, torque can be transmitted between the clutch hub 3 and the clutch drum 6, and by releasing the multi-plate dry clutch 7, the clutch hub 3 and the clutch drum 6 can be transmitted. Shut off torque transmission. Hereinafter, the alternately arranged drive plates 71 and driven plates 72 are collectively referred to as clutch plates 71 and 72.

  The hydraulic piston mechanism 8 is a hydraulic actuator that controls the engagement / release of the multi-plate dry clutch 7, and is disposed at a position between the transmission unit T / M side and the clutch drum 6. As shown in FIG. 2, the hydraulic piston mechanism 8 includes a piston 82, a first clutch pressure oil passage 85 that is formed in the motor housing 81 and guides the clutch pressure generated by the transmission unit T / M, and the first clutch. And a cylinder oil chamber 86 communicating with the pressure oil passage 85. The piston 82 is slidably provided in the cylinder hole 80 of the motor housing 81 (housing member), and the pressure applied to the cylinder oil chamber 86 from the first clutch pressure oil passage 85 when the multi-plate dry clutch 7 is engaged. Stroke in the direction of clutch engagement (right direction in FIG. 2) with oil pressure by oil.

  As shown in FIG. 2, between the piston 82 and the multi-plate dry clutch 7, as shown in FIG. 2, a needle bearing 87, a piston arm 83, a return spring 84, a piston retainer 88, and a bellows seal member are provided. 89,90 are installed.

  As shown in FIG. 2, the needle bearing 87 is interposed between the piston 82 and the piston arm 83 to suppress the piston 82 from being rotated with the rotation of the piston arm 83.

  As shown in FIG. 2, the piston arm 83 is slidably provided in a through hole 61 formed in the vertical wall 60 of the clutch drum 6 and protrudes into the clutch chamber 64 containing the multi-plate dry clutch 7. The part strokes following the stroke operation of the piston 82.

  The return spring 84 is interposed between the vertical wall 60 of the clutch drum 6 and the piston arm 83, and applies a biasing force in the clutch releasing direction to the piston arm 83 when the multi-plate dry clutch 7 is released.

  The piston retainer 88 is press-fitted and fixed to the tip of the piston arm 83, and when the multi-plate dry clutch 7 is fastened, it contacts the clutch plates 71 and 72 to transmit the clutch fastening force.

The bellows seal members 89 and 90 include an outer peripheral bellows seal member 89 and an inner peripheral bellows seal member 90, and a piston retainer 88 is integrally provided between the two bellows seal members 89 and 90. The bellows seal members 89 and 90 are fixed at positions where the through hole 61 and the arm tip are sealed from the clutch chamber 64, and elastically deform following the stroke operation of the piston retainer 88. That is, the bellows seal members 89 and 90 integrally having the piston retainer 88 are disposed in parallel with the vertical wall 60 at a position on the clutch chamber 64 side of the vertical wall 60 of the clutch drum 6 as shown in FIG.
In FIG. 2, a clutch damping member 101 is interposed between the piston arm 83 and the piston retainer 88, and the detailed configuration will be described later.

[Clutch fastening structure]
3 and 4 show a clutch fastening structure to which the clutch damping material fixing structure of the first embodiment is applied. FIG. 5 shows a bellows seal member having a piston retainer in a clutch fastening structure to which the clutch damping material fixing structure of the first embodiment is applied. Hereinafter, based on FIGS. 3-5, the detailed structure of a clutch fastening structure is demonstrated.

  As shown in FIG. 3, the clutch fastening structure using the piston arm 83 and its peripheral members includes a piston arm 83, a return spring 84, a piston retainer 88, bellows seal members 89 and 90, a clutch damping member 101, It is equipped with.

  As shown in FIGS. 3 and 4, the piston arm 83 includes an arm body 83a formed in an annular shape, an arm tip 83b protruding from the arm body 83a at four locations, and an arm tip 83b. And an arm tip surface 83c formed on the end surface. Each of the arm tip portions 83b protruding at four locations in the circumferential direction is inserted into four through holes 61 formed in the vertical wall 60 of the clutch drum 6.

  As shown in FIG. 3, the return spring 84 includes a spring support plate 84a formed in a ring shape, and a plurality of coil springs 84b fixed to the spring support plate 84a.

  As shown in FIG. 5, the piston retainer 88 is an annular metal member having an arm press-fit recess 88a having a press-fit surface 88b for the arm tip 83b of the piston arm 83 on the inner diameter side. As shown in FIG. 5, the arm press-fit recess 88a has a clutch contact surface 88c that contacts the clutch plates 71 and 72, and a position behind the clutch contact surface 88c, as shown in FIG. A concave bottom surface 88d facing the surface 83c.

As shown in FIG. 5, the bellows seal members 89 and 90 are seal members having a bellows cross-sectional shape made of, for example, synthetic rubber and integrally including a piston retainer 88. The bellows seal members 89 and 90 are integrally connected to the inner peripheral flange portion and the outer peripheral flange portion of the piston retainer 88 while maintaining a sealing property by vulcanization adhesion or the like. In addition to the piston retainer 88, the bellows seal members 89 and 90 are integrally provided with an inner peripheral side fixed retainer 103 and an outer peripheral side fixed retainer 104, and the inner peripheral side fixed retainer 103 and the outer peripheral side fixed retainer 104 are clutch drums. It is press-fitted and fixed to the step surface of the six vertical walls 60.
That is, the bellows seal members 89 and 90 integrally having the piston retainer 88 define an actuator chamber 63 (wet space) in which the hydraulic piston mechanism 8 is disposed and a clutch chamber 64 (dry space) in which the multi-plate dry clutch 7 is disposed. A partition function is provided (FIG. 2).

  The clutch damping material 101 is a member that gives a positive damping to the peripheral members of the multi-plate dry clutch 7 using, for example, a resin material having a damping property or durability such as nylon resin. The clutch damping material 101 is disposed between the piston arm 83 and the piston retainer 88 as shown in FIGS. The shape of the clutch damping member 101 is an annular shape arranged in the entire region connecting the arm tip 83b projecting from the arm body 83a of the piston arm 83 at four locations on the circumference.

[Clutch damping material fixing structure]
FIG. 6 shows a detailed configuration of the arm tip portion, the clutch damping material, and the piston retainer to which the clutch damping material fixing structure of the first embodiment is applied. Hereinafter, based on FIG. 6, the detailed structure of the fixing structure of the clutch damping material of Example 1 is demonstrated.

  As shown in FIG. 6, the piston arm 83 has an inner chamfer 83d (chamfer) at the front end portion on the press-fitting surface 83f side of the arm front end portion 83b, and an outer chamfer at the front end portion on the outer peripheral surface 83g side. Fur 83e is provided. The chamfering amount of the inner chamfer 83d is an amount that secures a clearance space for elastic deformation of the radial protrusion 101b of the clutch damping material 101, and interferes with the inner peripheral curved surface 88e formed in the arm press-fit recess 88a. It is smaller than the chamfering amount to avoid. The press-fit surface radius R1 of the press-fit surface 83f of the arm tip 83b is set smaller than the press-fit surface radius R2 of the press-fit surface 88b of the piston retainer 88 (R1 <R2). That is, the diameter difference (R2-R1) between the press-fitting surface radius R2 and the press-fitting surface radius R1 is used as the press-fitting allowance.

  As shown in FIG. 6, the piston retainer 88 has a press-fit surface 88b with the arm tip 83b on the inner diameter side of the arm press-fit recess 88a. The press-fitting surface 88b is a surface having a high dimensional accuracy with a small tolerance so as to ensure press-fitting to the arm tip 83b regardless of the dimensional variation of the press-fitting surface radius R1 of the press-fitting surface 83f of the arm tip 83b. Yes. An inner peripheral curved surface 88e and an outer peripheral curved surface 88f are respectively formed on the inner peripheral side and the outer peripheral side of the concave bottom surface 88d of the piston retainer 88 manufactured by press molding.

  As shown in FIG. 6, the clutch damping material 101 is formed in a radial direction from an annular damping material body 101a (elastic body) and an inner peripheral surface facing the press-fitting surface 88b of the damping material body 101a. A plurality of radial protrusions 101b that partially protrude toward the surface. Here, the number of the radial protrusions 101b is set to a number that secures a fixing force that does not fall off when the clutch damping material 101 temporarily fixed to the piston retainer 88 is turned downward while ensuring insertion workability. doing. For example, in Example 1, as shown in FIG. 3, several places are provided at equal angular intervals in the radial direction toward the rotation center axis (for example, six places). The thickness t2 of the radial protrusion 101b is smaller than the thickness t1 (for example, about 1 mm) of the attenuation material main body 101a. The inner radius R3 of the radial protrusion 101b is set to be smaller than the press-fit radius R2 of the press-fit surface 88b of the piston retainer 88 (R3 <R1 <R2). That is, the diameter difference (R2-R3) between the press-fitting surface radius R2 and the inner surface radius R3 is used as an elastic deformation allowance for obtaining a fixing force that prevents the clutch damping material 101 from falling off.

  Then, as shown by the phantom line in FIG. 6, the clutch damping member 101 is formed between the concave bottom surface 88d of the arm press-fit concave portion 88a formed by press-fitting the piston retainer 88 into the piston arm 83 and the arm front end surface 83c. In the gap position, the damping material main body 101a is clamped, and the plurality of radial projections 101b are elastically deformed and fixed. Note that the radial protrusion 101b bent in the left direction in FIG. 6 due to elastic deformation is in a state of being accommodated in a space defined by the inner chamfer 83d.

Next, the operation will be described.
The effects of the first embodiment are as follows: “radiation sound generation mechanism at engine start”, “radiation sound suppression action at engine start”, “clutch damping material fixing method and its characteristic action”, “multi-plate dry clutch assembly method” It is divided and explained.

[Radiation sound generation mechanism at engine start]
In the FF hybrid vehicle of the first embodiment, when there is a mode transition request from “EV mode” to “HEV mode”, the motor / generator 9 is used as a starter motor, and the engine Eng is started via the multi-plate dry clutch 7. Is called.

  As described above, when starting from the time when the engine Eng is stopped, the multi-plate dry clutch 7 disposed between the motor / generator 9 and the engine Eng is pressed and fastened while sliding, and the motor torque is transmitted to the engine Eng. Then, engine cranking is performed. However, since the stopped engine Eng has a large air compression reaction force in the cylinder and friction of the piston sliding portion, a large motor torque is required for cranking.

  On the other hand, in this mechanism that transmits the motor torque to the engine Eng while sliding the multi-plate dry clutch 7, it is necessary to generate a large clutch pressing force on the multi-plate dry clutch 7 in order to transmit a large torque to the engine Eng. There is.

  However, it is known that the μ-V characteristic, which is the relationship between the friction coefficient μ and the sliding speed V when sliding the friction surface of the multi-plate dry clutch, has a negative gradient depending on the state. When a large pressing force is generated in the clutch, negative damping proportional to the pressing force and a negative gradient is generated. In general, it is also known that self-excited vibration in which the natural mode of the clutch fastening structure diverges occurs when negative damping is large.

  In the hybrid drive force transmission system, when the engine is started in "EV mode", if the clutch is engaged with a large clutch pressing force while sliding the friction surface of the multi-plate dry clutch, a radiating sound may be generated that makes the passenger feel uncomfortable. Confirmed the fact. Therefore, as a result of elucidating the cause, it was found that when the negative damping of the multi-plate dry clutch is large, the self-excited vibration of the natural mode occurs in the piston arm which is a peripheral part of the multi-plate dry clutch. The self-excited vibration in the natural mode generated in the piston arm 83 is a vibration form in which the tip of the piston arm 83 repeats a shape change such as outward expansion and contraction as shown in FIG.

  Thus, when self-excited vibration in the natural mode occurs in the piston arm, the self-excited vibration is used as the excitation source, and the surrounding housing member, case member, etc. are used as the radiated sound transducer, and radiated sound is generated from the drive system. . As shown in the experimental result of FIG. 8, the sound pressure level of the radiated sound is high although it is a short time. In addition, when the engine is started while the vehicle is stopped or running in the quiet “EV mode”, if a radiated sound is generated from the drive system, the radiant sound that is uncomfortable for the passengers in the vehicle who are sensitive to the vibration Become a sound. It has been clarified that the above-described series of operations is a radiated sound generation mechanism in which a radiated sound is generated from the drive system at the time of engine start which is slip-engaged while sliding the friction surface of the multi-plate dry clutch.

[Radiation noise suppression when starting the engine]
In the first embodiment, a clutch damping material 101 that gives positive damping to the peripheral members of the multi-plate dry clutch 7 is disposed between the piston arm 83 and the piston retainer 88.

  In other words, when the engine is started by slipping while sliding the friction surface of the multi-plate dry clutch 7, the piston arm 83 strokes following the stroke operation of the piston 82. During the stroke of the piston arm 83, the piston retainer 88 fixed to the arm tip 83b of the piston arm 83 contacts the clutch plates 71 and 72 and transmits the clutch fastening force. At this time, if the negative damping of the multi-plate dry clutch 7 is large, as described above, the self-excited vibration in the natural mode is generated in the piston arm 83 that is a peripheral part of the multi-plate dry clutch 7.

  However, since the clutch damping material 101 is disposed between the piston arm 83 and the piston retainer 88, the negative damping of the multi-plate dry clutch 7 is canceled by the positive damping provided by the clutch damping material 101. For this reason, the self-excited vibration itself of the natural mode generated in the piston arm 83, which is the cause of the generation of radiated sound in the drive system, is suppressed.

  As a result, the generation of radiated sound from the drive system can be suppressed at the time of slip engagement in which the friction surface of the multi-plate dry clutch 7 is slid. As shown in the experimental results of FIG. 9, the effect of suppressing the generation of radiated sound is a radiated sound in which the sound pressure level is suppressed within a low level range below the noise level with respect to the high sound pressure level radiated sound shown in FIG. Thus, the effect of suppressing the generation of radiated sound was confirmed by experiments. That is, at the time of slip engagement in which the friction surface of the multi-plate dry clutch 7 is slid, generation of radiated sound due to self-excited vibration can be effectively achieved simply by disposing the clutch damping material 101 between the piston arm 83 and the piston retainer 88. Proven to be suppressed.

[Method of fixing clutch damping material and its characteristic action]
As described above, it has been proved that the generation of the radiated sound is effectively suppressed only by disposing the clutch damping material 101 between the piston arm 83 and the piston retainer 88. However, if the fixing force of the clutch damping material 101 with respect to the arm press-fitting recess 88a of the piston retainer 88 is weak, the clutch damping material will come off from the arm press-fit recess 88a of the piston retainer 88 when the piston retainer 88 is assembled to the piston arm 83. 101 may fall off.

  A method for fixing the clutch damping member 101 provided in the piston retainer 88 interposed between the piston arm 83 and the multi-plate dry clutch 9 according to the first embodiment solves this problem. Hereinafter, based on FIGS. 10-13, the fixing method of the clutch damping material 101 and its characteristic effect | action are demonstrated.

  First, when adopting the method of fixing the clutch damping material 101, as a precondition, the piston retainer 88 includes an arm press-fit recess 88a having a press-fit surface 88b for press-fitting the arm tip 83b of the piston arm 83 on the inner diameter side. The clutch damping material 101 is partially formed in an inner diameter direction from an inner circumferential surface facing the press-fitting surface 88b among the annular damping material main body portion 101a and the inner circumferential surface or outer circumferential surface of the damping material main body portion 101a. A plurality of radial protrusions 101b formed to protrude. Then, the clutch damping material 101 is fixed by a temporary fixing procedure, a pushing procedure, and a fixing procedure described below.

  As shown in FIG. 10, in the temporary fixing procedure, when the clutch damping material 101 is inserted into the arm press-fitting recess 88a of the piston retainer 88, the plurality of radial protrusions 101b are elastically deformed due to the difference in diameter with the press-fitting surface 88b. The clutch damping material 101 is temporarily fixed by the fixing force generated by this.

  As shown in FIG. 11, when the arm press-fitting recess 88a is press-fitted into the arm tip 83b of the piston arm 83 as shown in FIG. 11, after the clutch damping material 101 comes into contact with the arm tip 83c, the bottom surface of the arm press-fit recess 88a. Push the clutch damping material 101 toward 88d.

  As shown in FIG. 12, the fixing procedure includes a clearance between the bottom surface 88d of the arm press-fit recess 88a and the arm tip surface 83c formed by press-fitting the arm press-fit recess 88a to the arm tip 83b of the piston arm 83. The clutch damping material 101 is fixed at the position.

  As described above, in the first embodiment, when the clutch damping material 101 is inserted into the arm press-fit recess 88a of the piston retainer 88, a plurality of radial protrusions 101b are elastically deformed due to a difference in diameter from the press-fit surface 88b. The clutch damping material 101 is temporarily fixed by a fixing force.

  That is, when the piston retainer 88 is assembled to the piston arm 83, the piston retainer 88 having the clutch damping material 101 assembled in advance is press-fitted and fixed to the arm tip 83b of the piston arm 83. Therefore, in order to prevent the clutch damping material 101 from falling off from the piston retainer 88 during the assembly work, it is necessary to take measures to prevent the clutch damping material 101 from dropping off from the arm press-fit recess 88a of the piston retainer 88.

  In contrast, the press-fitting surface 88b of the arm press-fitting recess 88a of the piston retainer 88 is a surface having a high dimensional accuracy with a small tolerance so as to ensure press-fitting with respect to the arm tip 83b regardless of component variations. Paying attention to this point, the press-fit surface 88b of the arm press-fit recess 88a is used as a temporary fixing surface of the clutch damping material 101, and the plurality of radial protrusions 101b formed on the clutch damping material 101 are elastically deformed. Temporary fixing was performed by the generated fixing force. Thus, in the temporary fixing procedure, by using the press-fitting surface 88b of the arm press-fitting recess 88a as a temporary fixing surface, the elastic deformation amount (= fixing force) of the radial protrusion 101b is stabilized, and the clutch damping material 101 is Disengagement from the arm press-fit recess 88a of the piston retainer 88 is suppressed.

  As a result, when the piston retainer 88 is assembled to the piston arm 83, the clutch damping material 101 is prevented from being detached from the piston retainer 88 and falling off. When the clutch damping member 101 is temporarily fixed to the piston retainer 88, the temporary fixing parts are not newly added, and therefore the number of parts is not increased. Furthermore, when the clutch damping material 101 is temporarily fixed to the piston retainer 88, the press-fit surface 88b that the piston retainer 88 has in advance is used as a temporary fixing surface, so no additional work is required for temporary fixing and the number of processing steps is increased. I won't let you. In other words, it is not necessary to change the specifications of the bellows seal members 89 and 90 having the piston retainer 88 integrally.

In the first embodiment, an inner chamfer 83d is provided on the side of the press-fit surface 88b of the piston retainer 88 in the arm tip 83b of the piston arm 83.
That is, when the clutch damping material 101 is pushed in, the radial protrusion 101b is bent by the inner peripheral curved surface 88e. At this time, if there is no inner chamfer 83d, the radial protrusion 101b of the clutch damping member 101 is crushed by interference with the arm tip 83b of the piston arm 83, and the radial protrusion 101b is damaged or broken. There is a risk of doing.
On the other hand, the arm tip 83b of the piston arm 83 has an inner chamfer 83d on the press-fitting surface 88b side of the piston retainer 88. For this reason, the inner chamfer 83d becomes a clearance space when the radial projection 101b of the clutch damping material 101 is elastically deformed, and the arm tip 83b of the piston arm 83 and the radial projection 101b of the clutch damping material 101 Interference is prevented.

In the first embodiment, the thickness t2 of the radial protrusion 101b of the clutch damping material 101 is made thinner than the thickness t1 of the damping body main body 101a (t2 <t1).
That is, the elastic deformation allowance for obtaining a fixing force that does not cause the clutch damping material 101 to fall off is the difference in diameter (R2-R3) between the press-fit surface radius R2 of the press-fit surface 88b of the piston retainer 88 and the inner surface radius R3 of the radial protrusion 101b. Yes. At this time, the inner radius R3 of the radial protrusion 101b can be made smaller as the thickness of the radial protrusion 101b is smaller, and the elastic deformation allowance can be set larger.
Therefore, when the press-fitting surface 88b of the piston retainer 88 is used as a temporary fixing surface, the fixing force of the clutch damping material 101 is further stabilized by setting a large elastic deformation margin of the radial protrusion 101b. Further, when combined with the inner chamfer 83d, if the thickness t2 of the radial protrusion 101b of the clutch damping material 101 is reduced, the chamfering amount of the inner chamfer 83d is reduced. As a result, when the press-fitting fitting length between the arm tip 83b of the piston arm 83 and the press-fitting surface 88b of the piston retainer 88 is set, for example, the thickness of the radial protrusion 101b is equal to the thickness of the damping material main body 101a. Compared to, it can be secured longer. That is, the press-fit strength of the piston arm 83 and the piston retainer 88 can be increased by as much as the press-fit fitting length is secured.

In the first embodiment, the clutch is interposed between the engine Eng of the hybrid drive system and the motor / generator 9, and is engaged by transmitting the clutch fastening force from the piston arm 83 via the piston retainer 88. The plate dry clutch 7 is used. The elastic material is a clutch damping material 101 that gives positive damping to the multi-plate dry clutch 7.
That is, if the clutch damping material 101 is interposed between the piston arm 83 and the piston retainer 88 in a displaced state or is disposed in a deformed state, the generation of the radiated sound is effectively suppressed. I can't.
On the other hand, by adopting the fixing method of the clutch damping material 101 of the first embodiment, the clutch damping material 101 is arranged in an orderly manner between the piston arm 83 and the piston retainer 88, and effective generation of radiated sound is effectively suppressed. Is secured.

  The effects exhibited by the above-described method of fixing the clutch damping material 101 are also exhibited in the clutch damping material 101 fixing structure.

[Assembly method of multi-plate dry clutch]
A method for assembling the multi-plate dry clutch 7 that is fastened by transmitting the clutch fastening force from the piston arm 83 via the piston retainer 88 having the clutch damping material 101 will be described below with reference to FIGS. .

  First, when the assembly method of the multi-plate dry clutch 7 is adopted, as a prerequisite, the piston retainer 88 includes an arm press-fit recess 88a having a press-fit surface 88b for press-fitting the arm tip 83b of the piston arm 83 on the inner diameter side. The clutch damping material 101 is partially formed in an inner diameter direction from an inner circumferential surface facing the press-fitting surface 88b among the annular damping material main body portion 101a and the inner circumferential surface or outer circumferential surface of the damping material main body portion 101a. A plurality of radial protrusions 101b formed to protrude. And it is the method of assembling the multi-plate dry clutch 7 by the sub-assembly procedure, the piston retainer press-fitting procedure, and the clutch plate assembly procedure described below.

  In the sub-assembly procedure, as shown in FIG. 13, the clutch damping material 101 is inserted downward with respect to the opening of the arm press-fit recess 88a of the piston retainer 88 turned upward. At this time, the clutch damping member 101 is temporarily fixed by a fixing force generated by elastic deformation of the plurality of radial protrusions 101b due to a difference in diameter from the press-fitting surface 88b. By this sub-assembly procedure, bellows seal members 89 and 90 having a piston retainer 88 are prepared in advance.

  As shown in FIG. 14, in the piston retainer press-fitting procedure, first, a motor housing 81 in which the hydraulic piston mechanism 8 is incorporated is arranged with the arm tip 83b of the piston arm 83 facing upward. Then, as shown in FIG. 14, the arm press-fit recess 88a in which the clutch damping member 101 is temporarily fixed to the arm tip 83b with the opening of the arm press-fit recess 88a of the piston retainer 88 prepared in the sub-assembly procedure facing downward. Press to press fit. In this piston retainer press-fitting procedure, the piston retainer 88 is press-fitted and fixed, and the inner peripheral fixed retainer 103 and the outer peripheral fixed retainer 104 that are integrally provided with the bellows seal members 89 and 90 are connected to the step surface of the vertical wall 60 of the clutch drum 6. Press-fit into.

  The clutch plate assembly procedure follows the order in which the piston retainer pressure is obtained. As shown in FIG. 15, a plurality of clutch plates 71 and 72 are assembled in a stacked state downward toward the piston retainer 88 with the clutch contact surface 88c facing upward. . At this time, the driven plate 72 is fitted into the spline groove formed in the clutch drum 6, and finally the snap ring 74 is fixed to the ring groove.

  Thus, in the method for assembling the multi-plate dry clutch 7, the piston retainer press-fitting procedure is performed by arranging the motor housing 81 in which the hydraulic piston mechanism 8 is incorporated with the arm tip 83b of the piston arm 83 facing upward. That is, when the piston retainer 88 is assembled and press-fitted to the piston arm 83, the piston retainer 88 is moved downward with the clutch damping material 101 temporarily fixed from the opening of the arm press-fit recess 88a to the arm tip 83b of the piston arm 83. This is done by press-fitting and fixing. Therefore, it is necessary to have a fixing force that does not cause the clutch damping member 101, which is pressed down while being pressed downward, to fall off from the piston retainer 88.

  In contrast, the press-fitting surface 88b of the arm press-fitting recess 88a of the piston retainer 88 is a surface having a high dimensional accuracy with a small tolerance so as to ensure press-fitting with respect to the arm tip 83b regardless of component variations. Paying attention to this point, the press-fit surface 88b of the arm press-fit recess 88a is used as a temporary fixing surface of the clutch damping material 101, and the plurality of radial protrusions 101b formed on the clutch damping material 101 are elastically deformed. Temporary fixing was performed by the generated fixing force. In this way, by using the press-fitting surface 88b of the arm press-fitting recess 88a as a temporary fixing surface of the clutch damping material 101, the fixing force due to the elastic deformation of the radial protrusion 101b is strong and stable. Therefore, even if the press-fitting operation of the piston retainer 88 is performed while receiving the press-fitting external force with the clutch damping member 101 facing downward, it is possible to prevent the clutch damping member 101 from coming off from the arm press-fitting recess 88a of the piston retainer 88.

  As a result, when the multi-plate dry clutch 7 is assembled, the clutch damping material 101 is prevented from being detached from the piston retainer 88 and falling off even if a press-fitting operation is performed with the clutch damping material 101 kept downward.

Next, the effect will be described.
The effects listed below can be obtained in the clutch damping material fixing method, the fixing structure, and the clutch assembling method in the first embodiment.

(1) A method of fixing an elastic material (clutch damping material 101) included in a piston retainer 88 interposed between a piston arm 83 and a clutch (multi-plate dry clutch 7),
The piston retainer 88 includes an arm press-fit recess 88a having a press-fit surface 88b for press-fitting the arm tip 83b of the piston arm 83 on the inner diameter side,
The elastic material (clutch damping material 101) has an annular shape from the inner peripheral surface facing the press-fitting surface 88b of the elastic main body (damping material main body 101a) and the elastic main body (damping material main body 101a). A radial protrusion 101b formed to protrude partially or entirely in the direction, and
When an elastic material (clutch damping material 101) is inserted into the arm press-fit recess 88a of the piston retainer 88, the elastic material (clutch) is generated by a fixing force generated by elastic deformation of the radial projection 101b due to a difference in diameter with the press-fit surface 88b. A temporary fixing procedure for temporarily fixing the damping material 101);
When the arm press-fit recess 88a is press-fitted into the arm tip 83b of the piston arm 83, after the elastic material (clutch damping material 101) comes into contact with the arm tip face 83c, the elastic material (to the bottom face 88d of the arm press-fit recess 88a) The pushing-in procedure for pushing in the clutch damping material 101),
An elastic material (clutch damping material 101) is placed in the gap position between the bottom surface 88d of the arm press-fit recess 88a and the arm tip surface 83c formed by press-fitting the arm press-fit recess 88a to the arm tip 83b of the piston arm 83. Fixing procedure to fix,
(FIGS. 10 to 12).
For this reason, when the piston retainer 88 is assembled to the piston arm 83, the elastic material (clutch damping material 101) prevents the elastic material (clutch damping material 101) from coming off the piston retainer 88 and falling off without increasing the number of parts and the number of processing steps. A method of fixing the (clutch damping material 101) can be provided.

(2) The piston arm 83 has a chamfer (inner chamfer 83d) on the press-fit surface 88b side of the piston retainer 88 in the arm tip 83b (FIG. 6).
For this reason, in addition to the effect of (1), when the radial projection 101b of the clutch damping material 101 is elastically deformed, the inner chamfer 83d becomes a clearance space for the radial projection 101b which is elastically deformed, and the arm tip 83b And the radial protrusion 101b can be prevented from interfering with each other.

(3) The elastic material (clutch damping material 101) makes the thickness t2 of the radial protrusion 101b thinner than the thickness t1 of the elastic main body (damping material body 101a) (FIG. 6).
For this reason, in addition to the effect of (1) or (2), when using the press-fit surface 88b of the piston retainer 88 as a temporary fixing surface, by setting a large elastic deformation allowance of the radial projection 101b, the clutch damping material The fixing force of 101 can be further stabilized.

(4) The clutch is interposed between the engine Eng and the motor (motor / generator 9) of the hybrid drive system, and is engaged by transmitting the clutch engagement force from the piston arm 83 via the piston retainer 88. It is a dry clutch (multi-plate dry clutch 7),
The elastic material is a clutch damping material 101 that gives positive damping to the dry clutch (multi-plate dry clutch 7) (FIG. 2).
For this reason, in addition to the effects of (1) to (3), when the engine is started to perform slip engagement control of the dry clutch (multi-plate dry clutch 7) according to the mode transition request from the “EV mode” to the “HEV mode”, it is quiet. The generation of radiated sound due to self-excited vibration in the “EV mode” can be suppressed.

(5) A fixing structure of an elastic material (clutch damping material 101) included in the piston retainer 88 interposed between the piston arm 83 and the clutch (multi-plate dry clutch 7),
The piston retainer 88 includes an arm press-fit recess 88a having a press-fit surface 88b for press-fitting the arm tip 83b of the piston arm 83 on the inner diameter side,
The elastic material (clutch damping material 101) has an annular shape from the inner peripheral surface facing the press-fitting surface 88b of the elastic main body (damping material main body 101a) and the elastic main body (damping material main body 101a). A radial protrusion 101b formed to protrude partially or entirely in the direction, and
The elastic body (clutch damping material 101) is placed in the gap between the concave bottom surface 88d of the arm press-fit recess 88a and the arm front end surface 83c formed by press-fitting the piston retainer 88 to the piston arm 83. The damping material main body 101a) is clamped and the radial protrusion 101b is elastically deformed and fixed (FIG. 6).
For this reason, when the piston retainer 88 is assembled to the piston arm 83, the elastic material (clutch damping material 101) prevents the elastic material (clutch damping material 101) from coming off the piston retainer 88 and falling off without increasing the number of parts and the number of processing steps. A fixing structure of the (clutch damping material 101) can be provided.

(6) In the assembly method of the clutch (multi-plate dry clutch 7) that is fastened by transmitting the clutch fastening force from the piston arm 83 via the piston retainer 88 having an elastic material (clutch damping material 101),
The piston retainer 88 includes an arm press-fit recess 88a having a press-fit surface 88b for press-fitting the arm tip 83b of the piston arm 83 on the inner diameter side,
The elastic material (clutch damping material 101) has an annular shape from the inner peripheral surface facing the press-fitting surface 88b of the elastic main body (damping material main body 101a) and the elastic main body (damping material main body 101a). A radial protrusion 101b formed to protrude partially or entirely in the direction, and
When an elastic material (clutch damping material 101) is inserted into the opening of the arm press-fit recess 88a of the piston retainer 88, the elastic material is caused by a fixing force generated by elastic deformation of the radial protrusion 101b due to a difference in diameter with the press-fit surface 88b. A sub-assembly procedure for preparing a piston retainer 88 in which (clutch damping material 101) is temporarily fixed;
A housing member (motor housing 81) in which the hydraulic piston mechanism 8 is incorporated is arranged with the arm tip 83b of the piston arm 83 facing upward, and the opening of the arm press-fitting recess 88a of the piston retainer 88 prepared in the subassembly procedure faces downward A piston retainer press-fitting procedure for pressing and press-fitting an arm press-fitting recess 88a in which an elastic material (clutch damping material 101) is temporarily fixed to the arm tip 83b,
A clutch plate assembling procedure for assembling a plurality of clutch plates 71 and 72 in a stacked state downward toward the piston retainer 88 with the clutch contact surface 88c facing upward, following the order of obtaining the piston retainer pressure,
(FIGS. 13 to 15).
For this reason, when the clutch (multi-plate dry clutch 7) is assembled, the elastic material (clutch damping material 101) is detached from the piston retainer 88 even if the elastic material (clutch damping material 101) is kept downward and pressed. Thus, it is possible to provide a method for assembling the clutch (multi-plate dry clutch 7) that prevents the clutch from falling off.

  The elastic material fixing method and fixing structure and clutch assembling method of the present invention have been described based on the first embodiment. However, the specific configuration is not limited to the first embodiment, and Design changes and additions are permitted without departing from the spirit of the invention according to each claim of the scope.

  In the first embodiment, as the clutch damping material 101, an example in which the thickness t2 of the plurality of radial protrusions 101b is made thinner than the thickness t1 of the damping material body 101a is shown. However, as the clutch damping material 101, as shown in FIG. 16, the thickness of the plurality of radial projections 101b may be the same as the thickness t1 of the damping material body 101a. Also, the number of radial protrusions is not limited to the six shown in the first embodiment, and an optimal number can be selected according to the application location. Further, the radial protrusion may be an example in which a member having a thickness smaller than the thickness of the main body is protruded all around.

  In Example 1, the example of the clutch damping material 101 which suppresses generation | occurrence | production of a self-excited vibration by giving positive damping to the multi-plate dry clutch 7 at the time of slip fastening as an elastic material was shown. However, the elastic material may be an annular elastic material that is used simply for preventing the impact sound caused by metal contact or for spacers.

  In the first embodiment, as the piston retainer 88, the arm press-fitting recess 88a having the press-fitting surface 88b for press-fitting the arm tip 83b of the piston arm 83 on the inner diameter side is shown. However, the piston retainer may be an example including an arm press-fitting recess having a press-fitting surface on the outer diameter side for press-fitting the arm tip of the piston arm. In this case, the radial protrusion of the clutch damping material is formed in the outer radial direction from the outer peripheral surface of the damping material main body.

  In Example 1, the example of the multi-plate dry clutch 7 was shown as a clutch. However, the clutch is not limited to the multi-plate dry clutch as long as the clutch is fastened by the pressing force of the piston arm, such as a single-plate dry clutch or a multi-plate wet clutch.

  In the first embodiment, the application example to the hybrid driving force transmission device in which the engine and the motor / generator are mounted and the multi-plate dry clutch is the travel mode transition clutch is shown. However, the elastic material fixing method according to the present invention is not limited to a vehicle and can be applied to various clutch units as long as it is a unit having a structure for fixing an elastic material to a piston retainer interposed between a piston arm and a clutch. In addition, the assembly method of the fixing structure and the clutch can be applied.

Eng engine 3 clutch hub 6 clutch drum
60 vertical wall
61 Through hole
64 Clutch room 7 Multi-plate dry clutch (dry clutch)
71,72 Clutch plate 8 Hydraulic piston mechanism
81 Motor housing (housing member)
82 piston
83 Piston arm
83a arm body
83b Arm tip
83c Arm tip
88 Piston retainer
88a Arm press-fit recess
88b Press-fit surface
88c Concave bottom
88d Clutch contact surface
89,90 Bellows seal member 9 Motor / generator (motor)
101 Clutch damping material (elastic material)
101a Damping material body (elastic body)
101b Radial protrusion

Claims (6)

A method of fixing an elastic material in a piston retainer interposed between a piston arm and a clutch,
The piston retainer includes an arm press-fitting recess having a press-fitting surface on the inner diameter side or outer diameter side for press-fitting the arm tip of the piston arm,
The elastic material protrudes partially or entirely in the radial direction from a surface facing the press-fitting surface among an annular elastic main body and an inner peripheral surface or an outer peripheral surface of the elastic main body. Formed radial protrusions,
When the elastic material is inserted into the arm press-fitting recess of the piston retainer, the elastic material is temporarily fixed by a fixing force generated by elastic deformation of the radial protrusion due to a difference in diameter from the press-fitting surface. Procedure and
When the arm press-fitting recess is press-fitted into the arm tip of the piston arm, after the elastic material contacts the arm tip surface, a pushing-in procedure for pushing the elastic material toward the concave bottom surface of the arm press-fit recess;
A fixing procedure for fixing the elastic material at a gap position between the bottom surface of the arm press-fitting recess and the arm tip surface formed by press-fitting the arm press-fitting recess to the arm tip of the piston arm;
A method of fixing an elastic material, comprising: In the fixing method of the elastic material according to claim 1,
The said piston arm has a chamfer in the press injection surface side of the said piston retainer among the arm front-end | tip parts. The fixing method of the elastic material characterized by the above-mentioned. In the fixing method of the elastic material according to claim 1 or 2,
The elastic material has a thickness of the radial protrusion that is smaller than a thickness of the elastic main body. In the elastic material fixing method according to any one of claims 1 to 3,
The clutch is a dry clutch that is interposed between an engine and a motor of a hybrid drive system, and is engaged by transmitting a clutch fastening force from the piston arm via the piston retainer,
The elastic material is a clutch damping material that gives positive damping to the dry clutch. A structure for fixing an elastic material to a piston retainer interposed between a piston arm and a clutch,
The piston retainer includes an arm press-fitting recess having a press-fitting surface on the inner diameter side or outer diameter side for press-fitting the arm tip of the piston arm,
The elastic material protrudes partially or entirely in the radial direction from a surface facing the press-fitting surface among an annular elastic main body and an inner peripheral surface or an outer peripheral surface of the elastic main body. Formed radial protrusions,
The elastic body is clamped in the gap position between the bottom surface of the arm press-fitting recess formed by press-fitting the piston retainer into the piston arm and the tip end surface of the arm, and the diameter An elastic material fixing structure characterized in that the directional protrusion is fixed in an elastically deformed state. In the assembly method of the clutch that is fastened by transmitting the clutch fastening force from the piston arm via the piston retainer having an elastic material,
The piston retainer includes an arm press-fitting recess having a press-fitting surface on the inner diameter side or outer diameter side for press-fitting the arm tip of the piston arm,
The elastic material protrudes partially or entirely in the radial direction from a surface facing the press-fitting surface among an annular elastic main body and an inner peripheral surface or an outer peripheral surface of the elastic main body. Formed radial protrusions,
When the elastic material is inserted into the opening of the arm press-fitting recess of the piston retainer, the elastic material is temporarily fixed by a fixing force generated by elastic deformation of the radial protrusion due to a difference in diameter from the press-fitting surface. Sub-assembly procedure;
A housing member incorporating a hydraulic piston mechanism is arranged with the arm tip of the piston arm facing upward, the opening of the arm press-fitting recess of the piston retainer prepared in the subassembly procedure is directed downward, and the arm tip is A piston retainer press-fitting procedure for pressing and pressing the arm press-fitting recess to which the elastic material is temporarily fixed;
A clutch plate assembling procedure for assembling a plurality of clutch plates in a stacked state downward toward the piston retainer in which the clutch contact surface is facing upward, following the order of obtaining the piston retainer pressure.
A method for assembling a clutch, comprising: