US3719124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo-steering system for vehicles
Assignee: Daimler Benz AG
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Filing: 1971-03-01
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Granted: 1973-03-06
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Expires: 1991-03-01
Abstract
Abstract A servo-steering system for vehicles with a servo-motor assisting the manual force at the steering wheel which is controlled by way of a control slide valve in dependence on a transmitter element responding to the movements of the steering wheel; a reaction pressure derived from the load pressure and counteracting the manual force is rendered effective between the valve spool and a respective reaction piston supported against the valve housing; the reaction piston consists of a first piston part that is adapted to be supported fixedly at the valve spool and elastically at the valve housing, and of a second piston part movable relative to the first piston part, which is adapted to be supported against the valve housing by elastic means; after overcoming the elastic means for the second piston part, the latter is fixedly supported at the valve spool by the reaction pressure.
Inventors
- 👤 K Katz
- 👤 M Bulow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:46
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/061
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
223 words
A servo-steering system for vehicles with a servo-motor assisting the manual force at a steering wheel, which is controlled by way of a control slide valve means in dependence on a transmitter means responding to the movements of the steering wheel, and in which a reaction pressure derived from the load pressure and counteracting the manual force is rendered between a valve spool means of the control slide valve means and a reaction piston means supporting itself against the valve housing, and in which the reaction piston means includes a first piston part with a first piston pressure surface acted upon by the reaction pressure and a second piston part movable relative to the first piston part and provided with a second piston pressure surface also acted upon by the reaction pressure, the first piston part being supported against the valve housing by way of first elastic means and being rigidly engageable with the valve spool means after relative movement with respect to said valve spool means against the force of said first elastic means, said second piston part being supported with respect to the valve housing by second elastic means connected between the second piston part and the valve housing, the second piston part being rigidly supported at the valve spool means by the reaction pressure after overcoming the second elastic means.
Claim 2
Dependent Claim
223 words
A servo-steering system for vehicles with a servo-motor assisting the manual force at a steering wheel, which is controlled by way of a control slide valve means in dependence on a transmitter means responding to the movements of the steering wheel, and in which a reaction pressure derived from the load pressure and counteracting the manual force is rendered between a valve spool means of the control slide valve means and a reaction piston means supporting itself against the valve housing, and in which the reaction piston means includes a first piston part with a first piston pressure surface acted upon by the reaction pressure and a second piston part movable relative to the first piston part and provided with a second piston pressure surface also acted upon by the reaction pressure, the first piston part being supported against the valve housing by way of first elastic means and being rigidly engageable with the valve spool means after relative movement with respect to said valve spool means against the force of said first elastic means, said second piston part being supported with respect to the valve housing by second elastic means connected between the second piston part and the valve housing, the second piston part being rigidly supported at the valve spool means by the reaction pressure after overcoming the second elastic means.
Claim 3
Dependent Claim
223 words
A servo-steering system for vehicles with a servo-motor assisting the manual force at a steering wheel, which is controlled by way of a control slide valve means in dependence on a transmitter means responding to the movements of the steering wheel, and in which a reaction pressure derived from the load pressure and counteracting the manual force is rendered between a valve spool means of the control slide valve means and a reaction piston means supporting itself against the valve housing, and in which the reaction piston means includes a first piston part with a first piston pressure surface acted upon by the reaction pressure and a second piston part movable relative to the first piston part and provided with a second piston pressure surface also acted upon by the reaction pressure, the first piston part being supported against the valve housing by way of first elastic means and being rigidly engageable with the valve spool means after relative movement with respect to said valve spool means against the force of said first elastic means, said second piston part being supported with respect to the valve housing by second elastic means connected between the second piston part and the valve housing, the second piston part being rigidly supported at the valve spool means by the reaction pressure after overcoming the second elastic means.
Claim 4
Dependent Claim
223 words
A servo-steering system for vehicles with a servo-motor assisting the manual force at a steering wheel, which is controlled by way of a control slide valve means in dependence on a transmitter means responding to the movements of the steering wheel, and in which a reaction pressure derived from the load pressure and counteracting the manual force is rendered between a valve spool means of the control slide valve means and a reaction piston means supporting itself against the valve housing, and in which the reaction piston means includes a first piston part with a first piston pressure surface acted upon by the reaction pressure and a second piston part movable relative to the first piston part and provided with a second piston pressure surface also acted upon by the reaction pressure, the first piston part being supported against the valve housing by way of first elastic means and being rigidly engageable with the valve spool means after relative movement with respect to said valve spool means against the force of said first elastic means, said second piston part being supported with respect to the valve housing by second elastic means connected between the second piston part and the valve housing, the second piston part being rigidly supported at the valve spool means by the reaction pressure after overcoming the second elastic means.
Claim 5
Dependent Claim
85 words
A servo-steering system according to claim 1, characterized in that said first piston part is constructed as a piston pot open at the end surface thereof facing the adjacent valve housing wall, said piston pot being provided with a bore which connects the interior space of said piston pot with the associated reaction pressure space of the valve spool means, and in that said second piston part is constructed with a rod-shaped portion which is guided in said bore in a pressure-tight and displaceable manner.
Claim 6
Dependent Claim
28 words
A servo-steering system according to claim 2, characterizEd in that the first elastic means and the second elastic means are connected in parallel with respect to one another.
Claim 7
Dependent Claim
35 words
A servo-steering system according to claim 3, characterized in that the second elastic means, in the normal rest position of said second piston part unloaded by any pressure medium, engages simultaneously at both piston parts.
Claim 8
Dependent Claim
25 words
A servo-steering system according to claim 2, characterized in that the first and second elastic means are connected in series with respect to one another.
Claim 9
Dependent Claim
28 words
A servo-steering system according to claim 1, characterized in that the first elastic means and the second elastic means are connected in parallel with respect to one another.
Claim 10
Dependent Claim
35 words
A servo-steering system according to claim 6, characterized in that the second elastic means, in the normal rest position of said second piston part unloaded by any pressure medium, engages simultaneously at both piston parts.
Claim 11
Dependent Claim
20 words
A servo-steering system according to claim 1, characterized in that the first and second elastic means are connected in series.
Claim 12
Dependent Claim
109 words
A servo-steering system according to claim 1, wherein said first piston part is constructed pot-shaped with an annular sidewall portion having one end facing the adjacent housing wall and opposite the reaction pressure direction and having the other end closed by a bottom portion interconnecting said sidewalls, wherein the inwardly facing surfaces of said sidewalls define an interior space therebetween, wherein a bore is provided in said bottom portion which leads from the surface of the bottom portion facing oppositely of the adjacent housing wall into the interior space, and wherein said second piston part includes a rod-shaped portion guided in said bore in a pressure-tight and displaceable manner.
Claim 13
Dependent Claim
52 words
A servo-steering system according to claim 9, wherein said first elastic means includes a first spring member extending through at least a portion of the interior space and having one end in abutting engagement with the bottom portion of said piston and the other end rigidly engageable with the adjacent housing wall.
Claim 14
Dependent Claim
43 words
A servo-steering system according to claim 10, wherein a support piston is provided which has one end directly rigidly engaging the adjacent housing wall and the other end engaging said first spring member, said support piston being displaceably guided in said interior space.
Claim 15
Dependent Claim
53 words
A servo-steering system according to claim 10, wherein said second elastic means includes a second spring member arranged in said interior space concentrically to said first spring member, one end of said second spring member engaging the second piston part and the other end thereof being rigidly engageable with the adjacent housing wall.
Claim 16
Dependent Claim
31 words
A servo-steering system according to claim 12, wherein said one end of said second spring also engages a portion of said first piston part which faces oppositely to said reaction pressure.
Claim 17
Dependent Claim
43 words
A servo-steering system according to claim 12, wherein a support piston is provided which has one end directly rigidly engaging the adjacent housing wall and the other end engaging said first spring member, said support piston being displaceably guided in said interior space.
Claim 18
Dependent Claim
20 words
A servo-steering system according to claim 14, wherein said other end of said second spring rigidly engages said support piston.
Claim 19
Dependent Claim
14 words
A servo-steering system according to claim 9, wherein said annular sidewalls are cylindrically shaped.
Claim 20
Dependent Claim
114 words
A servo-steering system according to claim 1, wherein said first piston part is constructed pot-shaped with an annular sidewall portion having one end facing oppositely of the adjacent housing walls and in the same direction as the reaction pressure and having the other end closed off by a bottom portion interconnecting said sidewalls, wherein the inwardly facing surfaces of said sidewalls define an interior space therebetween, wherein a bore is provided in said bottom portion which leads from said interior space to the end of said first piston part facing the adjacent hoUsing wall, and wherein said second piston part includes a rod-shaped portion guided in said bore in a pressure-tight and displaceable manner.
Claim 21
Dependent Claim
46 words
A servo-steering system according to claim 17, wherein said first elastic means includes a first spring member arranged in said interior space and having one end in rigid engagement with said first piston part and the other end in rigid engagement with said second piston part.
Claim 22
Dependent Claim
40 words
A servo-steering system according to claim 18, wherein said second elastic means includes a second spring member having one end in rigid engagement with said second piston part and the other end in rigid engagement with said adjacent housing wall.
Claim 23
Dependent Claim
187 words
A servo-steering system for vehicles with a servo-motor assisting the manual force at a steering wheel, comprising a control slide valve means controlling said servo motor in dependence of a transmitter means responding to movements of the steering wheel, said control valve means including a valve housing means, valve spool means within said valve housing means and reaction piston means, a reaction pressure derived from the load pressure and counteracting the manual force being rendered effective between the spool valve means and a respective reaction piston means, said reaction means including a first piston part and a second piston part movable relative to said first piston part, said first piston part being supported at the valve housings means by ways of first elastic means and being rigidly engageable with the valve spool means after relative movement with respected to the valve spool means against the force of the first elastic means, and second elastic means between said second piston part and said valve housing means, said second piston part being rigidly supported at said valve spool means after overcoming the second elastic means by the reaction pressure.
Claim 24
Dependent Claim
187 words
A servo-steering system for vehicles with a servo-motor assisting the manual force at a steering wheel, comprising a control slide valve means controlling said servo motor in dependence of a transmitter means responding to movements of the steering wheel, said control valve means including a valve housing means, valve spool means within said valve housing means and reaction piston means, a reaction pressure derived from the load pressure and counteracting the manual force being rendered effective between the spool valve means and a respective reaction piston means, said reaction means including a first piston part and a second piston part movable relative to said first piston part, said first piston part being supported at the valve housings means by ways of first elastic means and being rigidly engageable with the valve spool means after relative movement with respected to the valve spool means against the force of the first elastic means, and second elastic means between said second piston part and said valve housing means, said second piston part being rigidly supported at said valve spool means after overcoming the second elastic means by the reaction pressure.
Claim 25
Dependent Claim
23 words
A servo-steering system according to claim 20, characterized in that the first elastic means and the second elastic means are connected in parallel.
Claim 26
Dependent Claim
35 words
A servo-steering system according to claim 21, characterized in that the second elastic means in the normal rest position of the second piston part unloaded by any pressure medium, engages simultaneously at both piston parts.
Claim 27
Dependent Claim
20 words
A servo-steering system according to claim 20, characterized in that the first and second elastic means are connected in series.
Claim 28
Dependent Claim
39 words
A servo-steering system according to claim 23, characterized in that the second elastic means engages at said first piston part and at the second piston part with the latter in the normal rest position relieved from any pressure medium.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |