Brake equalizer with housing enclosing piston and shock absorber

Details Brake equalizer with housing enclosing piston and shock absorber Brake equalizer with housing enclosing piston and shock absorber

1995-08-24

1998-10-13

Poon, Peter M.

Fluid-pressure and analogous brake systems

Pulsation neutralizers

138 31, B60T 1704

Patent

active

058202277

ABSTRACT:
An improved brake equalizer apparatus for equalizing fluid pressure and damping shock waves or pressure surges in fluid lines of a fluid pressure-actuated system, such as a hydraulic brake system. The apparatus has a shorter reaction time than a conventional brake equalizer, and can be manufactured with smaller overall length and weight. An important feature of the apparatus which results in reduced brake equalizer reaction time is an improved brake equalizer piston. The piston of the invention is shorter than a conventional brake equalizer piston (the ratio of the inventive piston's length to the length of the shock absorber which it abuts is substantially less than 0.5, and is preferably equal to about 0.23). The piston of the invention is also lighter than a conventional brake equalizer piston, and is preferably made of a hard, non-compressible, self-lubricating material. The brake equalizer of the invention does not employ any O-ring or other seal between the piston and the surrounding housing along which the piston slides, thus eliminating friction that would otherwise exist between such a seal and the housing as the piston slides along the housing.

REFERENCES:
patent: 3451431 (1969-06-01), Royer
patent: 3757825 (1973-09-01), Givens et al.
patent: 3931755 (1976-01-01), Hartridge
patent: 4166655 (1979-09-01), Spero
patent: 4220376 (1980-09-01), Spero
patent: 5078455 (1992-01-01), Washington

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