Transmission vaccum modulator assembly
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United States of America Patent
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-
Nov 9, 1993
Grant Date -
N/A
app pub date -
Jun 26, 1992
filing date -
Jun 26, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A transmission vacuum modulator assembly has a vacuum modulator with a heavy-gauge spring and a diaphragm that are moveably linked to a sliding or spool valve in a bore in a valve assembly. The flow of hydraulic transmission fluid into the transmission, preferably a diesel automatic transmission, is regulated by the sliding valve. The improvement comprises adding a coil spring having a spring force of between about 1 and 2 p.s.i. to the valve assembly in the bore to counteract the spring force on the sliding valve of the heavy-gauge spring in the modulator when the vacuum modulator assembly is in a lower vacuum/higher pressure position. With the added spring, upshifts during acceleration will occur under low vacuum/high pressure conditions without a need to release the throttle. The invention is particularly advantageous for emergency vehicles, such as ambulances, that require rapid, yet smooth, acceleration.
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