Manual displacement control

Details Manual displacement control Manual displacement control

1991-07-12

1992-06-16

Smith, Leonard E.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

60389, 92 122, F04B 126

Patent

active

051220377

ABSTRACT:
A manual displacement control is provided for varying the displacement of a hydraulic pump. The pump has a tiltable swashplate and is used in a hydraulic system which includes a control valve having an axially movable spool for metering control fluid to modulate the swashplate position. A displacement control linkage has a non-linear coupling element and a resilient override spring serially connected between the input lever and the valve spool. A torsional centering spring is connected between the input lever and the override spring to generate a feedback force which opposes a control force applied thereto and urges the input lever to a position representative of the no flow position of the pump swashplate. An adjustable connection is provided for centering the valve spool while maintaining a corresponding neutral position of the input lever and swashplate during assembly of the displacement control.

REFERENCES:
patent: 3212263 (1965-10-01), Hann
patent: 3522704 (1970-08-01), Martin
patent: 3911792 (1975-10-01), Heyl et al.
patent: 4461147 (1984-07-01), Myers

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