US4804057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power-assisted steering gear
Assignee: Robert Bosch GmbH
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Filing: 1987-04-21
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Granted: 1989-02-14
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Expires: 2007-04-21
Abstract
Abstract The invention relates to a power-assisted vehicle steering gear wherein a rotor is mounted directly on the pitman shaft via a coupling. The rotor rotates in a housing inner bore under the influence of circulating magnetic attraction in such a way that it is enabled to supply a torque to the pitman shaft.
Inventors
- 👤 Abdul R. Saeed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:03
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/04; B62D5/0409; B62D5/0412; B62D5/0415
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
150 words
A power-assisted vehicle steering gear comprising a pitman shaft coupled to an electrical power assist means connected between a steering wheel and a steering linkage which controls turning of the wheels, said electrical power-assist device including a housing, said housing forming a multi-polar magnetic device having a inner face (11), a rotor (6) in a bore in said housing which rotor is surrounded by said multi-polar magnetic device and includes a rotor face (8) opposite said inner face of said housing, said pitman shaft engaging one end of said rotor (6) for rotation thereof and for steering of said wheels, and said housing inner face (11) is disposed opposite said rotor face (8) in a power transmitting relationship and that a torque supplied to said pitman shaft (2) is reduced corresponding to a difference in the circumferential length of the housing face (11) and that of the rotor face (8).
Claim 2
Dependent Claim
150 words
A power-assisted vehicle steering gear comprising a pitman shaft coupled to an electrical power assist means connected between a steering wheel and a steering linkage which controls turning of the wheels, said electrical power-assist device including a housing, said housing forming a multi-polar magnetic device having a inner face (11), a rotor (6) in a bore in said housing which rotor is surrounded by said multi-polar magnetic device and includes a rotor face (8) opposite said inner face of said housing, said pitman shaft engaging one end of said rotor (6) for rotation thereof and for steering of said wheels, and said housing inner face (11) is disposed opposite said rotor face (8) in a power transmitting relationship and that a torque supplied to said pitman shaft (2) is reduced corresponding to a difference in the circumferential length of the housing face (11) and that of the rotor face (8).
Claim 3
Dependent Claim
41 words
A power-assisted vehicle steering gear as claimed in claim 1, characterized in that said pitman shaft (2) is provided with a coaxial coupling part (5) which engages said rotor (6) via recesses (7) allowing for some radial play within said housing.
Claim 4
Dependent Claim
36 words
A power-assisted vehicle steering gear as claimed in claim 2, in which said multi-polar magnetic device comprises a plurality of poles (A-F) which are uniformly distributed on the periphery of said bore which are successively activatable.
Claim 5
Dependent Claim
39 words
A power-assisted steering gear as claimed in claim 3, in which said coupling part (5) of the pitman shaft (2) and the corresponding rotor recesses (7) comprise a coupling which allows radial play of said rotor in all directions.
Claim 6
Dependent Claim
38 words
A power-assisted steering gear as claimed in claim 3, which includes sensors that detect the position of the rotor (6) and supply this information to an electronic switching device (17) which controls the position of said rotor (6).
Claim 7
Dependent Claim
39 words
A power-assisted steering gear as claimed in claim 2, in which said coupling part (5) of the pitman shaft (2) and the corresponding rotor recesses (7) comprise a coupling which allows radial play of said rotor in all directions.
Claim 8
Dependent Claim
38 words
A power-assisted steering gear as claimed in claim 6, which includes sensors that detect the position of the rotor (6) and supply this information to an electronic switching device (17) which controls the position of said rotor (6).
Claim 9
Dependent Claim
38 words
A power-assisted steering gear as claimed in claim 2, which includes sensors that detect the position of the rotor (6) and supply this information to an electronic switching device (17) which controls the position of said rotor (6).
Claim 10
Dependent Claim
33 words
A power-assisted steering gear as claimed in claim 3, which includes a sensor which detects torque of said pitman shaft and supplies this information to said electronic switching device for controlling said rotor.
Claim 11
Dependent Claim
36 words
A power-assisted vehicle steering gear as claimed in claim 1, in which said multi-polar magnetic device comprises a plurality of poles (A-F) which are uniformly distributed on the periphery of said bore which are successively activatable.
Claim 12
Dependent Claim
38 words
A power-assisted steering gear as claimed in claim 10, which includes sensors that detect the position of the rotor (6) and supply this information to an electronic switching device (17) which controls the position of said rotor (6).
Claim 13
Dependent Claim
33 words
A power-assisted steering gear as claimed in claim 11, which includes a sensor which detects torque of said pitman shaft and supplies this information to said electronic switching device for controlling said rotor.
Claim 14
Dependent Claim
38 words
A power-assisted steering gear as claimed in claim 1, which includes sensors that detect the position of the rotor (6) and supply this information to an electronic switching device (17) which controls the position of said rotor (6).
References Cited (Backward Citations)
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Cited
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Cited
GB2161030A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |