192 clutches and power-stop control – Clutches – Operators
Patent
1991-08-21
1993-01-19
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
1921062, 192 7017, 74574, 464 66, F16D 380
Patent
active
051800446
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a damper which is used for a torsional vibration damper which couples an engine flywheel with a transmission input shaft or for a damper disc for an automobile clutch, and especially to a liquid viscous damper which develops a hysteresis torque by means of a viscosity of liquid.
2. Description of the Related Art
A damper of such type is generally equipped with a output-side driven plate and an input-side drive plate which houses the foregoing driven plate by covering both sides and outer peripheral side of the driven plate, and has a damper mechanism for developing a torsional torque between the both plates.
Divided liquid chambers 38 & 39 are formed in a drive plate 3 as shown in FIG. 5, liquid is filled in these chambers and a choke S1 is provided between the divided liquid chambers 38 & 39. The choke S1 is formed between a notch 60 formed on a driven plate 23 and an inward facing projection 62 formed on the drive plate 3.
In order to let a hysteresis torque change in two stages for example, a stepped part 61 is formed on a midway of the notch 60 so that, when the drive plate 3 is twisted relatively to the driven plate 23 from a state of FIG. 5 for example to a rotation direction R side by .theta. 1 or to an opposite to the rotation direction R side by .theta. 2, a clearance of the choke S1 is changed from d1 to d2 and the hysteresis torque is increased from H1 to H2 as shown by FIG. 6. However, in the event a structure which changes the hysteresis torque by only the torsion angle of the drive plate 3 relative to the driven plate 23 is employed, it becomes impossible to develop the small hysteresis torque H2 in response to circumstances in a large torsion angle range and further it becomes impossible to develop the large hysteresis torque in response to circumstances in a small torsion angle range.
SUMMARY OF THE INVENTION
An object of this invention is to cope with a cycle-by-cycle variation of combustion and a vibration of car body without mutual confrontation, in such a manner as to allow a small viscous force to work when an operating angle is small arising in case of the cycle-by-cycle variation of combustion, and allowing a large viscous force to work when the operating angle is large accompanied by the vibration of the car body regardless of the range of the twisting angle.
In order to accomplish the above object, this invention provides a liquid viscous damper in which an output-side driven plate and an input-side drive plate housing the foregoing driven plate by covering both sides and outer peripheral side of the foregoing driven plate are installed, a damper mechanism for developing a torsional torque is installed in between the both plates, a liquid chamber is formed between the drive plates and filled with liquid, the liquid chamber is partitioned into circumferential front and rear divided-chambers, and the both divided chambers are connected by chokes; characterized by an outward facing projection protruding into the liquid chamber which is formed on the driven plate, a slider is which fitted onto the drive plate in such a manner as slidable in a rotation direction, a main choke which is formed between the slider and the projection, stoppers which are able to mate with the projection at circumferential both ends of the slider are formed with spaces left between them in the rotation direction, and a sub-choke connecting the both divided chambers which is formed separately from the main choke.
Under a state where the projection does not contact with the stoppers of the slider, the liquid flows from one divided chamber to the other divided chamber mainly through the main choke when the drive plate is twisted relatively to the driven plate. At the same time, it flows also through the sub-choke.
Consequently, a flow sectional area of the liquid which flows from one divided chamber to the other divided chamber becomes large, so that a flow resistance thereby becomes small and a small hysteresis torque is develope
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Fukushima Hirotaka
Takenaka Mitsuhiko
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
Pitts Andrea
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