Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1992-06-25
1993-12-14
Braun, Leslie A.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74527, 1921062, F16F 1510
Patent
active
052691985
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a damper used for a vibration damper connecting an engine flywheel and a transmission input shaft or for a damper disc of automobile clutch, and particularly to a liquid viscous damper producing a hysteresis torque by means of viscosity of liquid.
BACKGROUND ART
This kind of damper has an input-side drive plate 61 in which a freely rotatable output-side driven plate 62 and liquid for producing a hysteresis torque are incorporated, and includes a damper mechanism for producing a torsional torque installed in between the driven plate 62 and the drive plate 61, as shown by FIG. 5 for example.
A projection edge 62a of the output-side driven plate 62 and a projection edge 66a of the input-side annular plate 66 compose a final stopper mechanism, and the input side is coupled integrally to the output side when the both edges contact each other at the maximum torsion angle.
In order to let free an impact torque etc., the annular plate 66 is designed to freely slidable relative to the drive plate 61 in a circumferential direction and is divided into two pieces by a plane perpendicular to its axis, and both side faces of the annular plate 66 are pressed onto the drive plate 61 with a specified pressure by means of urging springs 68, as illustrated by FIG. 4. By thus constructing the damper, a torque can be transmitted from the drive plate 61 to the annular plate 66, and a slip can be produced between the annular plate 66 and the drive plate 61 so as to release an excessive impact torque when this excessive impact torque is given.
Since liquid is filled in the drive plate 61, a coefficient of friction between friction surfaces 61b and 66b is small. Accordingly, when a torque limiter is designed to produce a torque by pressing flat friction surfaces each other, a very large pressing force is required for setting a specified limit torque value at which the slippage occurs. For this reason, a large number of springs 68 having a large spring force become necessary, and it is also required to widen the friction surfaces 61b and 66b, as shown by FIG. 5.
DISCLOSURE OF THE INVENTION
Structure of the Invention
In order to solve the above-mentioned problem, this invention provides a liquid viscous damper having an input-side drive plate in which a freely rotatable output-side driven plate and liquid for producing a hysteresis torque are incorporated, and including a damper mechanism for producing a torsional torque installed in between the driven plate and the drive plate, characterized by that the drive plate is equipped with an annular housing slidable relative to it in circumferential direction, a max. torsional torque limiting stopper mechanism is installed between the housing and the driven plate, a torque limiter including balls, ball engaging concave portions and urging springs is installed between the housing and the drive plate, the ball engaging concave portions are formed on sliding surfaces of the drive plate, and the balls are put in guide holes made on the housing and urged by the urging springs to be pressed onto the sliding surfaces of the drive plate so as to engage with the ball engaging concave portions by a specified pressure.
Function
When a torsional torque value is smaller than or equal to a setting torque value of the torque limiter, the balls of the torque limiter are engaged with the ball engaging concave portions so that the torque is transmitted from the driven plate through the torque limiter to the annular housing.
In the event when an excessive impact torque etc. is produced, the driven plate is coupled integrally to the annular housing through the stopper mechanism, the balls get out of the ball engaging concave portions to release the torque limiter, and the drive plate is twisted relative to the annular housing. Thus, the impact torque etc. is absorbed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a vertical sectional view (corresponding to a sectional view taken on a line I--I of FIG. 2) of the liquid viscous damper to which this invent
REFERENCES:
patent: 2465832 (1949-03-01), Banker
patent: 3311718 (1967-03-01), Allison et al.
patent: 4783895 (1988-11-01), Reik
patent: 4890709 (1990-01-01), Reik et al.
patent: 4960147 (1990-10-01), Diamond
patent: 5048658 (1991-09-01), Reik
patent: 5097722 (1992-03-01), Fukushima
patent: 5180044 (1993-01-01), Fukushima
Braun Leslie A.
Kabushiki Kaisha Daikin Seisakusho
Massey Ryan W.
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