Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1991-04-19
1992-03-24
Braun, Leslie A.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74572, 1921062, 1921061, 192 7017, 464 68, F16F 1510
Patent
active
050977229
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a damper which is used for a torsional vibration damper coupling 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.
BACKGROUND ART
A damper of such type is generally equipped with a hub-side flange and a flywheel-side side plate body which houses the foregoing flange by covering both sides and outer peripheral side of the flange, and has a damper mechanism for developing a torsional torque between the flange and the side plate body. A notch 20 is formed on an outside end of the flange 2 as shown in FIG. 5, and liquid is filled in liquid chambers (28 & 29) formed by the notch 20 and an inside face of the side plate body. A projection 27, which protrudes in the liquid chambers (28 & 29) to partition the chambers into front and rear divided-chambers 28 & 29 in a rotation direction, is formed on the inside face of the side plate body 3 and a main choke A1 connecting the both divided-chambers 28 & 29 is formed.
In order to let a hysteresis torque change in two stages for example, a stepped part 60 is formed on a midway of the notch 20 so that, when the side plate body 3 is twisted relatively to the flange 2 from a state of FIG. 5 for example to a rotation direction R side by .theta.1 or to an opposite to the ration direction R side by .theta.2, a clearance of the choke A1 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 when such a structure as changing the hysteresis torque by only the torsion angle of the side plate body 3 relative to the flange 2 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.
OBJECT 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 allowing 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 car body regardless of the range of the twisting angle.
DISCLOSURE OF THE INVENTION
Technical Measure
In order to accomplish the above object, this invention provides a liquid viscous damper in which a hub-side flange and a flywheel-side side plate body housing the foregoing flange by covering both sides and outer peripheral side of the flange are installed, a damper mechanism for developing a torsional torque is installed in between the flange and the side plate body, a notch is formed on an outside end of the flange, liquid is filled in liquid chambers formed by the notch and inside faces of the side plate body, a projection protruding in the liquid chamber is formed on the inside face of the side plate body so as to partition the chamber into circumferential front and rear divided-chambers, and a main choke connecting the both divided-chambers is formed; characterized by that a slider is fitted onto a bottom edge of the notch in such a manner as slidable in a rotation direction, the main choke being formed between the slider and the projection, stoppers 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 movable sub-choke having a smaller flow sectional area than that of the main choke is formed in the slider.
Function
Under a state where the projection does not contact with the stoppers of the slider, the liquid in the notch flows from one divided-chamber to the other divided-chamber through the main choke and the movable sub-choke when the side plate body is twisted relatively to the flange. Co
REFERENCES:
patent: 4351167 (1982-09-01), Hanke et al.
patent: 4430064 (1984-02-01), Lamarche
patent: 4775042 (1988-10-01), Kohno et al.
patent: 4976656 (1990-12-01), Bacher et al.
Braun Leslie A.
Kabushiki Kaisha Daikin Seisakusho
Yip Winnie
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