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Apparatus for controlling a steering force of a handle in automobiles
| Details |
Inventors: Daido, Toshihiko; Matsubara, Hideo; Hirakushi, Shuzo;
Assignee: Koyo Seiko Kabushiki Kaisha (Osaka, JP); Koyo Jidoki Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Love; John J.
Assistant Examiner: McGiehan; Donn
Attorney, Agent or Firm: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.
Apparatus for controlling a steering force of a handle in an automobile having a power steering system in which a driving shaft of an auxiliary fluid pump for obtaining pressure oil for a hydraulic reaction chamber of the power steering system is made common to a driving shaft of a fluid pump for the power steering system to increase a quantity of discharge and oil pressure of the auxiliary pump. Oil pressure with respect to the hydraulic reaction chamber is controlled by the speed and steering angle of the automobile to obtain a proper steering force. |
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DETAILED DESCRIPTION What is claimed is: 1.
A handle steering force control apparatus for controlling a steering force of a handle in an automobile having a power steering system for assisting a steering force of the steering handle by a fluid from a fluid pump, and a hydraulic reaction chamber for applying a force opposite the steering force of the steering handle to the steering handle by the fluid, the steering force control apparatus comprising: an auxiliary pump having a driving shaft common to a driving shaft of a fluid pump to suction a fluid for the power steering system, a fluid passageway connected between an outlet of the auxiliary pump and a fluid tank for fluid, a flow control device provided in said fluid passageway to control the fluid by the speed of the automobile and the steering angle, A throttle means for said fluid provided in the fluid passageway on the outlet side of the flow control device, and a fluid branch passageway for a hydraulic reaction chamber, one end of the fluid branch passageway being in communication with a portion of the aforesaid fluid passageway between the outlet side of the fluid control device and the throttle means and the other end thereof being in communication with the hydraulic reaction chamber.
2.
The handle steering force control apparatus of claim 1, wherein said flow control device comprises a variable throttle valve the opening of which is adjusted by an electric signal corresponding to the speed of said automobile and the steering angle, and a flow control valve the opening degree of which is adjusted by a difference of liquid pressure of said fluid passage between the inlet and outlet sides of said variable throttle valve, and when the liquid pressure at said inlet side of said throttle valve is higher than that at said outlet side of said throttle valve, said fluid is returned to said fluid tank.
3.
The handle steering force control apparatus of claim 1, wherein said throttle means comprises a fixed throttle valve.
4.
The handle steering force control apparatus of claim 1, wherein said throttle means comprises a variable throttle valve whose opening degree is adjusted by the pressure of the liquid applied from said fluid pump to said power steering system
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