192 clutches and power-stop control – Clutches – Axially engaging
Patent
1988-01-07
1989-09-12
Braun, Leslie A.
192 clutches and power-stop control
Clutches
Axially engaging
192109R, 192113A, F16D 1372
Patent
active
048651745
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a cooling mechanism of a pull-type clutch applicable to automobiles and other vehicles.
BACKGROUND OF THE INVENTION
Generally, in a clutch for automobile etc., a facing at an outer periphery of an output side clutch disc is pressed or released by and between a flywheel receiving an engine torque and a pressure plate, so that an engine power is transmitted or cut off therebetween. Consequently, temperature rise occurs in the pressure plate and the facing to cause a deformation of a friction surface of the pressure plate, and an early wear and a fade phenomenon etc. of the facing. To cope with these troubles, various cooling mechanisms supplying cooling air to friction elements of the pressure plate and the facing from outside of the clutch cover have been proposed. In these mechanisms, however, the pressure plate is cooled by induced air so that a relative velocity with outside air utilizing a rotation of clutch can not be utilized positively to cause an insufficiency in cooling. Further, when a diaphragm spring is used for the pull-type clutch, a stud pin for supporting the diaphragm spring to a clutch cover becomes disused so that a separate locking mechanism for the diaphragm spring is required. Moreover, when a clutch cover assembly including no clutch disc is transported for delivery from a clutch manufacturer to an automobile manufacturer or stored therein as a stock in a position where the pressure plate is hung downward, the pressure plate will swung due to its weight or vibration so that a strap plate connecting the pressure plate to the clutch cover will be excessively bent or deformed in an extreme case. For this reason, separate clamping members (such as spacers, bolts etc.) for clamping the pressure plate have conventionally been assembled thereto for avoiding the foregoing troubles during transportation or storing of a unit of the clutch assembly. However, this method has required additional labors in removing the clamping members from the pressure plate when it is assembled to an automobile and in previously attaching the clamping members to the pressure plate.
DISCLOSURE OF THE INVENTION
An object of this invention is to let holder fastened to a pressure plate have functions of a cooling fin and a blade for inducing cooling air flow in order to obtain a positive cooling effect by taking advantage of a fact that window holes (conventional stud pin holes) of a diaphragm spring become disused in the pull-type clutch, to let it serve also as a locking mechanism for the diaphragm spring, and further to let it have a function of a clamping member for preventing the pressure plate from swinging during transportation and storing of a unit of a clutch assembly.
In a pull-type clutch having a clutch cover fastened to a flywheel, a diaphragm spring an outer peripheral portion of which is supported to a flywheel side of an inner peripheral portion of the clutch cover through a wire ring, a pressure plate supporting a flywheel side inner peripheral edge of an outer peripheral annular portion of the diaphragm spring, a strap plate connecting the pressure plate with the clutch cover, and a clutch disc disposed between the pressure plate and the flywheel, the clutch disc being released by pulling in an opposite-to-flywheel-direction tip ends of release levers positioned between slits extending to a central axis side from plural window holes arranged at an internal side of said outer peripheral annular portion; the present invention relates to a cooling mechanism of the pull-type clutch having an annular holder which covers an opposite-to-flywheel side of said outer peripheral annular portion, a leg piece which extends from a holder inner peripheral edge through a part of said window holes to the flywheel side to be secured to the pressure plate, a blade piece which extends from the holder inner peripheral edge to the remaining part of the window holes to force air into the window holes during rotation, and a stopper which extends from a holder outer periphera
REFERENCES:
patent: 4657128 (1987-04-01), Fujito et al.
Braun Leslie A.
Kabushiki Kaisha Daikin Seisakusho
Pitts Andrea
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