US3565205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic reaction servo-steering device
Assignee: Individual
•
Filing: 1968-11-19
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Granted: 1971-02-23
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Expires: 1988-11-19
Abstract
Abstract A hydraulic reaction device for servo-steering of an automobile utilizing hydraulic pressure to supplement the manual steering. A steering shaft and steering spindle cooperate with a distributing valve to provide the desired metering of hydraulic fluid to a double-sided piston. The necessary steering shaft reaction to give the operator the appropriate feel for controlling the vehicle is provided by a pair of opposite acting reaction pistons. The pistons are designed with a notch in their center and have a length much greater than the diameter of the pistons to prevent any possibility of jamming that is associated with smaller length pistons.
Inventors
- 👤 Fermin Pages Planas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:28
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/20; B62D5/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
A hydraulic reaction servo-steering device comprising a pressure source; a steering shaft; a steering spindle operatively connected to the steering shaft; a pair of reaction pistons acting in opposite directions and each having a length much greater than the diameter of the piston; means for housing each piston, the pistons operatively connected to the steering shaft and opposing rotation of the steering shaft in both clockwise and counterclockwise rotation; and means for placing only one face of each piston in hydraulic communication with the pressure source in a given rotation, whereby a steering shaft reaction is produced by both the reaction pistons.
Claim 2
Dependent Claim
102 words
A hydraulic reaction servo-steering device comprising a pressure source; a steering shaft; a steering spindle operatively connected to the steering shaft; a pair of reaction pistons acting in opposite directions and each having a length much greater than the diameter of the piston; means for housing each piston, the pistons operatively connected to the steering shaft and opposing rotation of the steering shaft in both clockwise and counterclockwise rotation; and means for placing only one face of each piston in hydraulic communication with the pressure source in a given rotation, whereby a steering shaft reaction is produced by both the reaction pistons.
Claim 3
Dependent Claim
48 words
A hydraulic reaction servo-steering device as in claim 1, further including a distribution valve; the steering shaft being centrally positioned and operatively connected to the distribution valve and having at least two diametrically opposite teeth on which the simultaneous action of the two reaction pistons is exerted separately.
Claim 4
Dependent Claim
45 words
A hydraulic reaction servo-steering device as in claim 2, where the steering shaft has a cylindrical set of teeth including the teeth driven by the two reaction pistons, and the spindle has complementary teeth adapted to limit the relative rotation between the spindle and shaft.
Claim 5
Dependent Claim
85 words
A hydraulic reaction servo-steering device as in claim 3, where the teeth on the steering shaft have an involute profile which permits rolling and the reaction pistons have respectively side notches, the side of the teeth contacting the faces of the spindle teeth and the side notches in the reaction pistons as as to drive them, the involute portion corresponding to the outer part of each tooth profile and being followed by a straight strengthening portion which merges into a rounded root of the tooth.
Claim 6
Dependent Claim
65 words
A hydraulic reaction servo-steering device as in claim 1, where the reaction pistons are movable within the steering spindle and further have a side notch which operatively engages one of the teeth of the shaft and transmits to the shaft the hydraulic force of reaction without loss of free movement should the steering be worked by hand in case of failure of the hydraulic system.
Claim 7
Dependent Claim
37 words
A hydraulic reaction servo-steering device as in claim 5, where the side notches in the reaction pistons have side faces with a profile corresponding to that of the teeth on the shaft, thereby permitting a rolling action.
Claim 8
Dependent Claim
63 words
A hydraulic reaction servo-steering device as in claim 5, where the spindle further has two diametrically opposite recesses between the teeth, and the complementary teeth of the spindle and of the shaft have a rolling profile that contact except for the recesses which, because of coincidence with tHe notches in the reaction pistons, do not come into contact with teeth of the shaft.
Claim 9
Dependent Claim
19 words
A hydraulic reaction servo-steering device as in claim 1, where the means for housing each piston includes closing members.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |