Axial piston pump neutral centering mechanism

Details Axial piston pump neutral centering mechanism Axial piston pump neutral centering mechanism

1997-08-08

1998-12-08

Nguyen, Hoang

Expansible chamber devices

Displacement control of plural cylinders arranged in...

Parallel cylinders

92 57, 92 71, 4172221, 417269, F01B 300

Patent

active

058455590

ABSTRACT:
A variable displacement axial piston pump (11) having a tiltable swashplate (33) to vary pump displacement by a manual input lever (43). The pump includes a neutral centering device (45) in which a cam member (57) is fixed to the end of one trunnion member (35). The cam member (57) defines three cam surfaces (65), each having a minimum displacement portion (67) and at least one maximum displacement portion (69). In engagement with each of the cam surfaces (65) is a follower element (79) supported by a cam follower holder (73), both of which are biased by a set of Belleville washers (75), toward the cam member (57). The present invention provides a neutral centering device which is balanced and simple to assemble, not requiring any special fixtures or holders for preloading a biasing spring, but which is able to provide a substantially constant return torque.

REFERENCES:
patent: 3282225 (1966-11-01), Moon
patent: 3831497 (1974-08-01), Trabbic et al.
patent: 3967541 (1976-07-01), Born et al.
patent: 4087970 (1978-05-01), Slazas et al.
patent: 4111062 (1978-09-01), Callaghan
patent: 4455920 (1984-06-01), Shaw et al.
patent: 4584926 (1986-04-01), Beck, Jr. et al.
patent: 4934252 (1990-06-01), Giere

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