Controller with reduced travel limit slip

Details Controller with reduced travel limit slip Controller with reduced travel limit slip

1990-10-11

1992-08-11

Look, Edward K.

Power plants

Pressure fluid source and motor

Expansible chamber type volumetric responsive measuring...

91375R, 180141, F16D 3102, F15B 910

Patent

active

051368447

ABSTRACT:
A controller (15) is provided of the type which may be utilized in a hydrostatic power steering system. The controller includes a fluid actuated displacement mechanism (21) comprising a stationary ring (47) and a moveable star (49) to meter fluid flow through the controller valving (19). A plug member (105) is operable to apply a braking force to the moveable member (49) and it cooperates with the housing (27) to define a fluid chamber (109). The housing defines a fluid passage (111, 113, 117, 119) between the fluid chamber and the controller valving (19). The controller valving in the housing defines a drain passage (95, 99, 97) to drain the fluid chamber (109) when the controller valving is in its first operating position (FIG. 4 ) and to restrict the drain and allow pressure to increase in the fluid chamber (109) when the valving is approaching its maximum displacement position (FIG. 5). As a result, travel limit slip is substantially reduced by applying a braking force to the star, but only when the valving is approaching its maximum displacement position, thus avoiding the problem of feed-through.

REFERENCES:
patent: 3801239 (1974-04-01), Larson
patent: 3880554 (1975-04-01), Termansen et al.
patent: 4096883 (1978-06-01), Yip
patent: 4558720 (1985-12-01), Larson et al.
patent: 4804016 (1989-02-01), Novacek et al.
patent: 4958493 (1990-09-01), Schutten et al.
patent: 5016672 (1991-05-01), Stephenson

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