192 clutches and power-stop control – Clutches – Operators
Patent
1988-08-05
1990-03-27
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 30L, 192 7017, F16D 314, F16D 4702
Patent
active
049112783
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a damper disk used as clutch disks for automobiles and others, and particularly to a damper disk including a spring adapted to elastically and axially deflect for absorbing or damping vibration of rotational torque.
2. Description of the Prior Art
The damper disk of the type described above can generally have a large relative torsion angle between an input and output parts or members, and thus can effectively absorb the torque vibration as compared with conventional structures in which springs for absorbing the torque vibration are compressed in a circumferential direction of the disk.
Examples of the disks including such axially deflectable spring are disclosed in the Japanese Utility Model application No. 58-89711 (Laid-Open Publication No. 59-194638) and Japanese Patent Application No. 61-152290, which are commonly assigned to Kabushiki Kaisha Daikin Seisakusho, assignee of the present application.
The disk according to the former application comprises a helical spline as means for converting a relative rotational movement between an input and output parts into an axial movement. This helical spline requires complicated machining work.
The disk according to the latter application can dissolve such a disadvantages. It comprises a cam mechanism as movement converting means. In this cam mechanism, when the cam at an input side rotates relative to a cam at an output side, the cam at the input side axially moves to deflect a diaphragm spring in the same direction.
In the disk including the cam mechanism, a clutch plate which is connected to a friction facing is utilized as a support member for axially supporting the cam mechanism from the side opposite to the diaphragm spring. Therefore, if such structures are employed in such a type of disk that have especially large maximum torsion angle and/or torsion torque, the clutch plate may be plastically deformed by the reaction force caused by elastic deflection of the diaphragm spring, in which case the elastic force of the diaphragm spring is reduced and the disk can not effectively achieve the intended damping function.
SUMMARY OF THE INVENTION
According to the invention, a damper disk comprises a hub connected to an output shaft, an input part disposed around the hub, a pair of diaphragm springs disposed at axially opposite sides of the input part, a fulcrum mechanism through which the diaphragm springs are supported by the input part, and a cam mechanism disposed between the radially inner portions of the diaphragm springs. The cam mechanism includes an output cam rigidly connected to the hub, and a pair of input cams axially engaging the diaphragm springs and unrotatably connected to the input cams, respectively. Both of the input cams are adapted to move axially oppositely in accordance with relative rotation between the input and output cams.
In the illustrated embodiment, the fulcrum mechanism comprises wire rings which are seated on the diaphragm springs to form fulcrums thereof, and bent plate members for immovably supporting all of the wire rings.
The input part may be formed by one driven plate including a portion to which a friction facing is fixed and a portion which supports the wire rings. The driven plate may integrally include portions to which the input cams are connected.
Further, in the embodiment, the fulcrum mechanism includes wire rings which are seated on the diaphragm springs to form fulcrums thereof, respectively, and circumferentially spaced and axially extending rod-like support members, each of which is fixed at its axially middle portion to the input part, radially immovably supports the wire rings and supports at its opposite ends the diaphragm springs through the wire rings.
The cam mechanism may include rolling members disposed between the input cams and output cam, and springs axially elastically pressed to the input cams and output cam may be disposed therebetween except for the regions in which the rolling members are disposed.
According
Kabayama Yoshiaki
Mizuguchi Kimio
Takeuchi Hiroshi
Tojima Hiromi
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
Whitelaw Nicholas
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