US3877540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power steering system having a varying resistance responsive to running speed
Assignee: Jidosha Kiki Co Ltd
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Filing: 1973-10-19
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Granted: 1975-04-15
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Expires: 1993-10-19
Abstract
Abstract Herein disclosed in a power steering system for use in an automotive power steering apparatus which includes a hydraulic motor for imparting a turning motion to a wheel axle of the vehicle, and a rotary control valve having input and output members connected respectively to a steering wheel of the vehicle and to the hydraulic motor and responsive to an angular displacement between the input and output members for regulating a working fluid under pressure to control the operation of the hydraulic motor. The present power steering system comprises means such as a governor pressure source for producing a second working fluid under pressure having its level varied in accordance with a running speed of the vehicle, and a reaction mechanism disposed at a portion of the output member of the rotary control valve and receptive of the second working fluid for resisting the angular displacement in accordance with the pressure level of the same, so that a resistance responsive to a running speed of the vehicle is imparted to the hydraulic motor and accordingly to the steering wheel.
Inventors
- 👤 Naosuke Masuda
- 👤 Yoshiyuki Shimoura
- 👤 Hideo Konishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:04
CPC Classifications
B; B62; B62D; B62D6/00; B62D6/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
191 words
In a power steering system having a rotary control valve adapted for regulating a first working fluid upon angular displacement between concentric, radially inner, input and radially outer, output members, so as to control the operation of a hydraulic motor; the improvement comprising: an annular groove formed in a portion of the outer peripheral surface of said output member for receiving a second working fluid of a pressure controlled in response to the speed of the vehicle on which the power steering apparatus is mounted, opposed pairs of plunger bores formed within the output member and extending inwardly from said annular groove towards each other, diametrically opposed radial recesses formed within the inner periphery of the output member and intersecting respective pairs of bores and forming therewith an abutment member defining the inner ends of respective bores, projections extending diametrically from the outer periphery of the input member and disposed within respective recesses within the inner periphery of said output member, and plungers slidably positioned within each of the plunger bores with said plungers abutting said abutment and respective sides of said pRojections when said valve is in its neutral position.
Claim 2
Dependent Claim
191 words
In a power steering system having a rotary control valve adapted for regulating a first working fluid upon angular displacement between concentric, radially inner, input and radially outer, output members, so as to control the operation of a hydraulic motor; the improvement comprising: an annular groove formed in a portion of the outer peripheral surface of said output member for receiving a second working fluid of a pressure controlled in response to the speed of the vehicle on which the power steering apparatus is mounted, opposed pairs of plunger bores formed within the output member and extending inwardly from said annular groove towards each other, diametrically opposed radial recesses formed within the inner periphery of the output member and intersecting respective pairs of bores and forming therewith an abutment member defining the inner ends of respective bores, projections extending diametrically from the outer periphery of the input member and disposed within respective recesses within the inner periphery of said output member, and plungers slidably positioned within each of the plunger bores with said plungers abutting said abutment and respective sides of said pRojections when said valve is in its neutral position.
Claim 3
Dependent Claim
63 words
The power steering system as claimed in claim 1, wherein: said abutment means comprise steps which partially close off said plunger bore and wherein said projections and said steps are of corresponding width such that the bottom of respective bores as defined by the sides of said steps and the sides of said projections are coplanar with said valve in its neutral position.
Claim 4
Dependent Claim
57 words
The power steering system as claimed in claim 1, wherein: said projections are formed integrally with said input member and the width of said recesses within the inner periphery of the output member are wider than the width of said projections such that said input member can rotate relative to said output member under limited angular displacement.
Claim 5
Dependent Claim
95 words
The power steering system as claimed in claim 1, wherein: said rotary control comprises a cylindrical valve casing, said output member is rotatably and sealably mounted within said valve casing, said annular groove is formed within a portion of the outer periphery of said output member such that said groove is sealed relative to said valve casing, such that said second working fluid at a pressure corresponding to the speed of the vehicle which is continuously applied to the ends of said plunger by way of said plunger bores which open to said annular groove.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |