Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1992-06-26
1993-11-09
Wright, Dirk
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
F16H 5930
Patent
active
052592731
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.
REFERENCES:
patent: 3448767 (1969-06-01), Wonn
patent: 3587355 (1971-06-01), Schaefer
patent: 3748931 (1973-07-01), Schaefer et al.
patent: 3886819 (1975-06-01), Lentz
patent: 4711140 (1987-12-01), Younger
Ford C-6 Automatic Transmission/Diagnosis--Service Overhaul Manual, ATRA Transmissions (undated).
Deltrans Inc.
Wright Dirk
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