Title:
【発明の名称】自動車のパワーステアリング装置
Document Type and Number:
Japanese Patent JPH09508872
Kind Code:
A
Abstract:
In a motor vehicle power steering, a steering valve (16) is provided to control the hydraulic medium. The steering valve (16) has two inlet seat valves (24, 25) and two outlet seat valves (26, 27) displaceable by an actuator (37) depending on the rotation of a steering shaft. The outlet seat valves (26, 27) are closed in the neutral position of the steering valve (16). The inlet seat valves (24, 25) are pressed in the closing direction by the force of closing springs (30) and open only when the corresponding outlet seat valves (26, 27) are closed. A delimiting piston (38) is provided at both sides of the steering valve (16). Both delimiting pistons (38) are pressed on the one hand by the prevailing pressure in a working chamber (10, 11) of a servo motor (7) and on the other hand by the force of delimiting springs (40) which in the neutral position of the steering valve (16) hold the delimiting pistons (38) at a distance from the closure body (28) of the inlet seat valve (28). When the force of the pressure acting on the delimiting pistons (38) exceeds the force of the delimiting springs (40), the delimiting pistons (38) are pressed against the closure body (28) of the inlet seat valve (25) and act thereon. This arrangement achieves a cutting or limiting effect of the actuating moment. A centring spring (45) co-operates with the delimiting spring (40) to centre the steering valve (16). Both springs act together through a cup spring (44) on the actuating tappet (35). The centring spring (45) is coaxially arranged within the delimiting spring (40).
Inventors:
Lang, Armin
Application Number:
JP52157995A
Publication Date:
September 09, 1997
Filing Date:
February 14, 1995
Export Citation:
Assignee:
ZF FRIEDRICHSHAFEN AG
International Classes:
B62D5/08; (IPC1-7): B62D5/08
Attorney, Agent or Firm:
Kazuo Sato (3 others)