Hydraulic retarder control system

Details Hydraulic retarder control system Hydraulic retarder control system

1993-06-18

1994-10-25

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Using a rotary-type fluid damper

192 4B, B60T 108

Patent

active

053580818

ABSTRACT:
The hydraulic retarder control system comprises pressure reducing valves which can switch the pressure of the air to be supplied from a pressure air source 4 to an air/liquid conversion device 25 at least to a low pressure, an intermediate pressure and a high pressure, or a proportional electromagnetic valve 110 which can reduce and adjust the pressure of the air in a stageless manner, and running speed detect devices 100, 111 which detect the fact that the running speed of a vehicle is equal to or slower than a given running speed. When there is given a detect signal by the running speed detect devices 100, 111, then the pressure reducing valves 32, 95 or the proportional electromagnetic valve 110 are or is switched over to a pressure higher than a set pressure for running speeds exceeding the given running speed, so that the high pressure air from the pressure air source 4 can be supplied to the air/liquid conversion device 25.

REFERENCES:
patent: 3749209 (1973-07-01), Weinrich et al.
patent: 3777860 (1973-12-01), Forster et al.
patent: 4235320 (1980-11-01), Polak et al.
patent: 4262781 (1981-04-01), Schneider
patent: 4272131 (1981-06-01), Termont
patent: 4324387 (1982-04-01), Steinhagen
patent: 4432442 (1984-02-01), Vogelsang
patent: 4711328 (1987-12-01), Bazilio et al.
patent: 4881625 (1989-11-01), Redelman

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