System for inspecting vehicular shock absorber

Details System for inspecting vehicular shock absorber System for inspecting vehicular shock absorber

1996-09-10

1998-05-26

Dombroske, George M.

Measuring and testing

Testing of shock absorbing device

By applying reciprocating or oscillating motion

73 1108, G01M 1704, G01M 1900

Patent

active

057568774

ABSTRACT:
The invention inspects a shock absorber installed in a vehicle between a vehicle body and a road wheel by manually moving the vehicle body in a generally vertical direction of the vehicle until the vehicle body initiates vibration in the vertical direction, detecting vertical displacement of the vehicle body, detecting load imposed on road surface by the road wheel, giving, as a damping force, the load detected at moment when the detected displacement is zero, and calculating a first derivative, with respect to time, of the detected displacement at the moment to give the result as a piston speed of the shock absorber at the moment. The damping force against the piston speed is compared with a predetermined damping force against the piston speed to evaluate whether the shock absorber has been deteriorated or not.

REFERENCES:
patent: 4002051 (1977-01-01), Hilbrands
patent: 4103532 (1978-08-01), Buzzi
patent: 4376387 (1983-03-01), Stevens et al.
patent: 5056024 (1991-10-01), Stuyts
patent: 5125681 (1992-06-01), Brackette, Jr.

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