Machine element or mechanism – Gearing – With fluid drive
Patent
1974-11-29
1976-01-06
Scott, Samuel
Machine element or mechanism
Gearing
With fluid drive
137386, 137413, F16H 4700, E03B 506, E03C 100, F16K 3118
Patent
active
039304230
ABSTRACT:
A power shift transmission having a fluid pressure control system having an intake screen and level control located centrally in the bottom of the sump and a pump and regulator valve supplying pressure to the shift control system and to a sump oil level control. The sump oil level control has a small float controlling a relay valve to control an oil level control valve connecting an elevated oil reservoir for gravity feed to fill the sump and pressure return to the reservoir to dump the sump. When the transmission input and pump is not driven, there is no pressure in the chambers at opposite ends of the differential land area level valve and balanced springs hold the level valve in a central closed position blocking flow to and from the reservoir, to the sump and from the pressure line so the oil level control is inoperative. When the transmission input is driven, a small flow of line pressure is supplied through an inlet restriction to each chamber. When the oil level is low, a miniature float provides a small force to close the miniature relay valve closing a restricted exhaust from the chamber at the larger area land so equal pressures in the chambers act on the differential land area to move the level valve to the fill position closing the supply pressure port and providing a full flow connection from the reservoir for gravity feed at a low volume rate of flow to the sump. When the oil level is high the float permits the pressure to open the relay valve and the restricted exhaust reduces the pressure in the larger area chamber to move the level valve to dump position closing the sump port and connecting a restricted supply pressure branch to the reservoir so the transmission pump delivers fluid at the same low volume rate of flow from the sump to the reservoir to reduce the oil level. In a modification a level indicating thermistor controls a solenoid controlled relay valve similarly controlling the oil level valve.
REFERENCES:
patent: 2568506 (1951-09-01), Mercer
patent: 2570451 (1951-10-01), Hottenroth
patent: 3107553 (1963-10-01), Tuck
patent: 3144056 (1964-08-01), Mosher
patent: 3363466 (1968-01-01), Guidi
patent: 3412610 (1968-11-01), Prussin
patent: 3500687 (1970-03-01), Smith
patent: 3524523 (1970-08-01), Kilmex et al.
patent: 3789865 (1974-02-01), Borman
Chandler Lance W.
General Motors Corporation
Heiter A. M.
Scott Samuel
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