Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1986-07-28
1988-09-27
Dorner, Kenneth J.
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
188310, 280 90, 280272, B62K 2108, F16F 914
Patent
active
047735147
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hydraulic damping device of the kind indicated in the preamble of claim 1. Thus, it is intended to be used in motor cycles in order to achieve a controlled damping of rapid pivotal or oscillating movements of the front or back wheel while driving.
One important aspect of the invention is to solve the problem of so called wobbling, which has been observed more and more during recent years, wherein at high speed, the front wheel of the motor cycle sometimes starts to oscillate with an increasing amplitude. The driver has great difficulties in stopping such a phenomenon and many severe accidents have occured as a direct consequence thereof. It is also desireable to dampen sudden jerks caused by irregularites on the road-way or the ground.
Another aspect of the invention is to achieve a controlled shock absorption of the back wheel when the latter hits the ground upon jumping of the whole motor cycle, especially in motor-cross driving. Conventionally, such shock absorbtion is effected solely by spring means operatively connected between the frame and the back wheel fork, which is pivotably mounted at the frame of the motor cycle.
It is generally known that oscillations or other movements of mechanical systems can be damped by means of hydraulic shock absorbers, especially of the kind comprising a cylinder and a piston displaceable therein. However, there is also another type of hydraulic dampers, comprising a casing having a sector-shaped hydraulic chamber in which a piston wing is pivotable back and forth while being damped by hydraulic fluid, which is previously known from the patent specifications GB No. 1148 384 (Armstrong), U.S. Pat. No. 1,873,100 (Allen) and U.S. Pat No. 1,957,996 (Fieldman), all these known devices being adapted to be mounted in automative vehicles having at least four wheels.
Thus, GB No. 1 148 384 (Armstrong) discloses a hydraulic damper forming a part of a steering assembly controlling the two front road wheels of a vehicle. By way of links coupled to the front wheels, the damper, taking the place of the usual steering idler box, will damp high frequency vibrations occurring in straight ahead driving or when rounding slight curves at critical speeds. For this purpose, the complementary compartments on each side of the pivotable piston wing or vane are connected by fluid flow resting means, including damping valves, incorporated in the shaft or spindle connected to the wing. The damping effect is progressively reduced at each side of a central angular region by means of hydraulic bypass grooves in the top plate of the casing.
U.S. Pat. No. 1,873,100 (Allen) relates to a hydraulic shock absorbing device for minimizing the road shocks normally transmitted through the springs of the frame of a motor-driven vehicle. A semi-circular casing is attached to the frame of the vehicle, whereas the internal piston wing or vane is connected to a shaft, the end of which is connected to a wheel axis of the vehicle by way of a lever and a rigid connecting link. A bypass channel in the casing is provided with an adjustment screw, whereby the damping power can be set as desired.
U.S. Pat. No. 1,957,996 (Friedman) discloses a hydraulic shock absorber adapted to be mounted in a similar manner as the Allen device. However, this device is rather complicated and includes a reservoir chamber communicating via check valves with each working chamber on the respective sides of the piston wing, a separate valve casing including a plurality of channels and valve means, and plates provided with bypass grooves and apertures, so as to provide compensation for fluid leakage from the working chambers, variations in temperature and viscosity of the fluid, and a controlled damping of the compression movement of the vehicle spring as well as the rebound movement. In the bypass passages between the chamber compartments on each side of the piston wing, there are independent check valves each consisting of a ball held in port-closing position by means of a spring. Each valve will open when the pre
REFERENCES:
patent: 1506495 (1924-08-01), MacRae
patent: 1628811 (1927-05-01), Shultz et al.
patent: 1957997 (1934-05-01), Fieldman
patent: 2009678 (1935-07-01), Pennington
patent: 2039695 (1936-05-01), Watt
patent: 2084001 (1937-06-01), McGinnes
patent: 2087535 (1937-07-01), Dall
patent: 3512803 (1970-05-01), Hines et al.
Albertsson Per Hakan
Brown Peter R.
Dorner Kenneth J.
Teltscher Edwin S.
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