The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 1992
Filed:
Oct. 11, 1990
Dwight B Stephenson, Savage, MN (US);
Bernard J Larson, New Hope, MN (US);
Eaton Corportaion, Cleveland, OH (US);
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.