Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1980-10-27
1984-02-21
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74868, 74867, B60K 4116
Patent
active
044322550
ABSTRACT:
A hydraulic control for a power transmission has a regulator valve for controlling the hydraulic system pressure and a plurality of shift valves for controlling the automatic ratio change in the transmission. The shift valves are urged toward the higher ratio position by a governor pressure. The shift valves, except the 1-2 valve, are selectively subjected to separate modulated throttle valve pressures acting in opposition to the governor pressure and depending upon whether the respective shift valve is in the lower or higher ratio position. The modulated pressures are maintained at substantially zero for a portion of the throttle valve pressure range so that upshifting and downshifting will be sensitive to governor pressure and therefore vehicle speed only.
The regulator valve is subject to a variable bias pressure which is proportional to throttle valve pressure. The bias pressure is controlled by a valve to be equal to the throttle pressure during the lower pressure portion of the throttle pressure range and to increase at a rate less than the throttle valve pressure during the remainder of the pressure range.
REFERENCES:
patent: 3580112 (1971-05-01), Dach
patent: 3886819 (1975-06-01), Lentz
patent: 4106369 (1978-08-01), Taga
Borman August H.
Perlick Mark A.
Braun Leslie A.
General Motors Corporation
Scherer Donald F.
Wright D.
LandOfFree
Hydraulic control for a power transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic control for a power transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic control for a power transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1030200