Variable displacement hydrostatic pump and neutral return mechan

Details Variable displacement hydrostatic pump and neutral return mechan Variable displacement hydrostatic pump and neutral return mechan

1992-06-08

1993-08-10

Bertsch, Richard A.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

74 96, 74470, 91497, 92 121, F04B 106, F01B 1306, G05G 505

Patent

active

052343219

ABSTRACT:
A neutral centering spring mechanism (71) is provided for a variable displacement hydrostatic pump (25) of the type of which control of the displacement occurs in response to rotation of a control shaft (101;101'). Disposed about the control shaft is a pair of preferably identical actuator members (111,113), each of which is in engagement with a pin (115) such that clockwise rotation of the control shaft rotates one actuator member (111) while counter-clockwise rotation of the control shaft rotates the other actuator member (113). Each actuator member defines a movable stop surface (131,137), which are in engagement with fixed stop surfaces (133,139). A single torsion spring member (121) surrounds the actuator members, biasing both actuator members toward the neutral position. The neutral centering spring mechanism of the invention is relatively insensitive to manufacturing tolerances, is simple and inexpensive to manufacture, and may easily be disposed within the pump housing (29) where it is more protected from corrosion and damage, and is lubricated.

REFERENCES:
patent: 2406138 (1946-08-01), Ferris et al.
patent: 2673526 (1954-03-01), Horton
patent: 4968227 (1990-11-01), Szulczewski et al.

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