Patent US3867870A successfully refreshed from Google Patents.
US3867870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control valve reaction device for a power steering system
Assignee: Jidosha Kiki Co Ltd
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Filing: 1973-07-25
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Granted: 1975-02-25
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Expires: 1993-07-25
Abstract
Abstract A control valve reaction device for a power steering system, which comprises a plurality of reaction plungers inserted slidably in a sleeve valve member connected to a threaded shaft member of two shaft members, the axes of the plungers being displaced at a right angle from the shaft member, and in which an end of said reaction plunger acts on a seat surface of a rotor valve member formed in the steering shaft member and a fluid pressure passing to a pressure motor caused from operation of a control valve by relative rotation of said two shaft members acts on an end surface of said reaction plunger, and thrust force of said reaction plunger produced therefrom is imparted to the rotor valve member to generate a rotational force resistant to the relative rotation of said two shaft members.
Inventors
- 👤 Yoshiyuki Shimoura
- 👤 Hideo Konishi
- 👤 Hirotetsu Sonoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:21
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/20; B62D5/24; F; F15; F15B; F15B13/00; F15B13/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
324 words
In a power steering system having a control valve reaction device, the combination comprising: a fluid pressure motor having a piston and a cylinder slidably fitted with said piston for assisting manual steering torque; steering handle shaft means for transmitting a steering torque applied to a steering handle, and comprising a threaded shaft member threadly coupled with the piston of said fluid pressure motor and a steering shaft member; a flexible connecting member connecting relatively rotatably said two shaft members; a control valve comprising a sleeve valve member connected to said threaded shaft member and a rotor valve member formed in said steering shaft member and operating said fluid pressure motor by relative rotary movement of said two shaft members; an annular groove formed in the periphery of said sleeve valve member and connected to an inlet for pressure fluid at the periphery of said sleeve valve member; a plurality of reaction plungers slidably mounted in saId sleeve valve member in a common plane with said annular groove such that one end of each plunger is exposed directly to fluid pressure in said annular groove; said rotary valve member having two rotor grooves in fluid communication with said cylinder on respectively opposite sides of said piston such that one or the other of said sides can be fluid pressurized by relative rotary movement of said rotary valve member and sleeve valve member; different ones of said reaction plungers bearing at their other ends against said rotary valve member in respective ones of said rotor grooves so as to be exposed to the pressures in the respective grooves, whereby the one ends of said reaction plungers are exposed to pressurized inlet fluid and the other ends will be exposed to the pressure prevailing in their respective rotor grooves, and the net thrust force of said reaction plungers will be applied against said rotor valve member to oppose relative rotary movement of said two shaft members.
Claim 2
Dependent Claim
324 words
In a power steering system having a control valve reaction device, the combination comprising: a fluid pressure motor having a piston and a cylinder slidably fitted with said piston for assisting manual steering torque; steering handle shaft means for transmitting a steering torque applied to a steering handle, and comprising a threaded shaft member threadly coupled with the piston of said fluid pressure motor and a steering shaft member; a flexible connecting member connecting relatively rotatably said two shaft members; a control valve comprising a sleeve valve member connected to said threaded shaft member and a rotor valve member formed in said steering shaft member and operating said fluid pressure motor by relative rotary movement of said two shaft members; an annular groove formed in the periphery of said sleeve valve member and connected to an inlet for pressure fluid at the periphery of said sleeve valve member; a plurality of reaction plungers slidably mounted in saId sleeve valve member in a common plane with said annular groove such that one end of each plunger is exposed directly to fluid pressure in said annular groove; said rotary valve member having two rotor grooves in fluid communication with said cylinder on respectively opposite sides of said piston such that one or the other of said sides can be fluid pressurized by relative rotary movement of said rotary valve member and sleeve valve member; different ones of said reaction plungers bearing at their other ends against said rotary valve member in respective ones of said rotor grooves so as to be exposed to the pressures in the respective grooves, whereby the one ends of said reaction plungers are exposed to pressurized inlet fluid and the other ends will be exposed to the pressure prevailing in their respective rotor grooves, and the net thrust force of said reaction plungers will be applied against said rotor valve member to oppose relative rotary movement of said two shaft members.
Claim 3
Dependent Claim
46 words
Apparatus according to claim 1 wherein different ones of said reaction plungers inserted in the sleeve valve member inside said annular groove are offset oppositely from the axis of the rotor valve member and oriented so as to bias said rotor valve member in opposite directions.
Claim 4
Dependent Claim
60 words
Apparatus according to claim 1 wherein half of the reaction plungers inserted slidably in the sleeve valve member bear against seat surfaces formed in the rotor groove connected to one side of the cylinder of the fluid pressure motor and the remaining half bear against seat surfaces formed in the rotor groove connected to the other side of the cylinder.
Claim 5
Dependent Claim
34 words
Apparatus as claimed in claim 1 wherein said reaction plungers are engaged in plunger holes opening into the annular groove of said sleeve valve, and extend therethrough to bear against said rotor valve member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |