Patent US3579978A successfully refreshed from Google Patents.
US3579978A
Expired / Lapsed
US
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Hydraulic drive control arrangement
Assignee: Robert Bosch GmbH
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Filing: 1969-05-07
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Granted: 1971-05-25
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Expires: 1989-05-07
Abstract
Abstract A drive for a car or machine comprises a combustion engine driving a hydrostatic pump-motor transmission. The fuel supply of the combustion engine, the discharge volume of the pump, and the acceptance volume of the hydraulic motor are simultaneously adjusted by three cam followers under the control of three threedimensional cam faces of a control cam which is manually turned, and axially shifted distances depending on the hydraulic pressure in the hydrostatic transmission so that maximum efficiency and performance are obtained.
Inventors
- 👤 Dietrich Stams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:01
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/10; B60W10/101; B60W10/103; B60W30/00; B60W30/18; B60W30/188; F16H61/475; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18888; Y10T74/1892; Y10T74/1896
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
178 words
Hydraulic drive control arrangement, comprising, in combination, drive means including a prime mover having first adjustable regulating means, and a hydrostatic transmission including a pump having second adjustable regulating means and being driven by said prime mover, and a hydraulic motor having third adjustable regulating means and being hydraulically connected with said pump; and a control device including control means connected with said first, second, and third regulating means for simultaneously adjusting the same to move to correlated positions, manual means for operating and setting said control means and thereby said first, second and third regulating means in accordance with operational conditions, and pressure responsive means hydraulically connected with said transmission and operatively connected with said control means for automatically operating the same in accordance with the fluid pressure in said transmission so that said first, second, and third regulating means are also continuously and automatically adjusted depending on the fluid pressure in said transmission whereby by operation of said manual means maximum performance and optimal efficiency of said drive means can be obtained at different operational conditions.
Claim 2
Dependent Claim
178 words
Hydraulic drive control arrangement, comprising, in combination, drive means including a prime mover having first adjustable regulating means, and a hydrostatic transmission including a pump having second adjustable regulating means and being driven by said prime mover, and a hydraulic motor having third adjustable regulating means and being hydraulically connected with said pump; and a control device including control means connected with said first, second, and third regulating means for simultaneously adjusting the same to move to correlated positions, manual means for operating and setting said control means and thereby said first, second and third regulating means in accordance with operational conditions, and pressure responsive means hydraulically connected with said transmission and operatively connected with said control means for automatically operating the same in accordance with the fluid pressure in said transmission so that said first, second, and third regulating means are also continuously and automatically adjusted depending on the fluid pressure in said transmission whereby by operation of said manual means maximum performance and optimal efficiency of said drive means can be obtained at different operational conditions.
Claim 3
Dependent Claim
117 words
Hydraulic drive control arrangement as claimed in claim 1 wherein said control means includes cam means having three three-dimensional cam surfaces, and first, second, and third cam follower means cooperating with said cam surfaces and being respectively connected with said first, second, and third regulating means for simultaneously adjusting the same, said three-dimensional cam surfaces having suCh a shape that said cam follower means set said first, second, and third regulating means simultaneously to correlated positions in which said drive means operate at optimal efficiency and maximal output; wherein said manual means move said cam means in one direction; and wherein said pressure responsive means move said cam means in a direction transverse to said one direction.
Claim 4
Dependent Claim
33 words
Hydraulic drive control arrangement as claimed in claim 2 wherein said prime mover is a combustion engine, and wherein said first regulating means regulates and measures the fuel supplied to said combustion engine.
Claim 5
Dependent Claim
122 words
Hydraulic drive control arrangement as claimed in claim 2 wherein said control device includes mounting means for mounting said cam means for rotation about an axis, and for rectilinear movement in opposite axial directions; wherein said manual means are connected with said cam means for turning the same about said axis; wherein said mounting means include a cylinder connected with said transmission for receiving high pressure fluid from said pump; and wherein said pressure responsive means include a piston secured to said cam means and located in said cylinder so that the pressure in the same moves said piston and said cam means in one axial direction, and biassing means biassing said cam means and said piston in the opposite axial direction.
Claim 6
Dependent Claim
101 words
Hydraulic drive control arrangement as claimed in claim 4 wherein said cam means includes three cam uniformly spaced at angles of 120* about said axis, each cam having a three-dimensional cam surface; and wherein said first, second, and third cam follower means are located in a common plane transverse to said axis spaced at angles of 120* and supported on said mounting means for radial movement, said first, second, and third cam follower means having inner ends cooperating with said three-dimensional cam surfaces of said three cams, respectively, and outer ends respectively connected with said first, second, and third regulating means.
Claim 7
Dependent Claim
85 words
Hydraulic drive control arrangement as claimed in claim 4 wherein said cam means includes first, second, and third axially aligned cams connected with each other for turning movement about said axis, and being connected with each other for movement in said opposite axial directions; wherein said first, second and third cams have three-dimensional cam surfaces; wherein said first, second, and third cam follower means are spaced in axial direction and cooperate with said three-dimensional cam surfaces of said first, second, and third aligned cams, respectively.
Claim 8
Dependent Claim
78 words
Hydraulic drive control arrangement as claimed in claim 4 wherein said cam means has said piston at one axial end and a second piston at the other axial end; wherein said mounting means includes first and second bearings for mounting said pistons for rotation and axial movement with said cam means, said first bearing communicating with said cylinder and said second bearing supporting said other piston; and wherein said biassing means includes a spring abutting said other piston.
Claim 9
Dependent Claim
100 words
Hydraulic drive control arrangement as claimed in claim 7 wherein said manual means include a shaft coaxial with said cam means and secured to the same for axial and turning movement, a bushing supported by said mounting means for turning movement, and nonmovable in axial direction, said shaft being surrounded by said bushing and connected with the same for turning movement and being movable relative to the same in said opposite axial directions, and a handle secured to said bushing for turning the same with said shaft and said cam means while the same move in said opposite axial directions.
Claim 10
Dependent Claim
55 words
Hydraulic drive control arrangement as claimed in claim 8 comprising guide means having a slot in which said handle is guided for movement in a plane transverse to said axis; and wherein said guide means has means for arresting said handle at angular positions at which said drive means operate at maximum efficiency and performance.
Claim 11
Dependent Claim
127 words
Hydraulic drive control arrangement as claimed in claim 4 wherein said transmission includes a first connecting conduit connecting the outlet of said pump with the inlet of said hydraulic motor, a second connecting conduit connecting the inlet of said pump with the outlet of said motor, and a third connecting conduit connecting said first and second connecting conduits; and wherein said pressure responsive means include two check valves in said third connecting conduit acting in opposite flow directions, and a conduit connected at one end to said third connecting conduit between said check valves, and connected at the other end with said cylinder so that said piston is subjected to the higher fluid pressure of the different fluid pressures produced in said first and second connecting conduits.
Claim 12
Dependent Claim
37 words
Hydraulic drive control arrangement as claimed in claim 4 comprising first, second, and third power boosters respectively controlled by said first, second and third cam follower means and respectively operating said first, second, and third regulating means.
Claim 13
Dependent Claim
58 words
Hydraulic drive control arrangement as claimed in claim 1 wherein said prime mover is a combustion engine and said first regulating means regulates the fuel supplied to said combustion engine; wherein said second regulating means regulates the fluid volume discharged by said pump; and wherein said third regulating means regulates the fluid volume accepted by said hydraulic motor.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |