US3690097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus having interconnected hydraulic units operable as pumps, hydraulic motors, and as a hydrostatic transmission
Assignee: Robert Bosch GmbH
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Filing: 1970-10-02
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Granted: 1972-09-12
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Expires: 1990-10-02
Abstract
Abstract The rotors of two hydraulic radial piston units, one of which is driven by a prime mover, can be connected and disconnected by mechanical coupling means so that one, or both units pump pressure fluid to a hydraulic consumer motor, dependent on the required consumer load. A valve can be operated to hydraulically connect the units so that the driven pump unit delivers pressure fluid to the other hydraulic unit which operates as the motor of a hydrostatic transmission to rotate an output shaft.
Inventors
- 👤 Dieter Widmaier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:55
CPC Classifications
F; F01; F01B; F01B1/00; F01B1/06; F01B1/0675; F01B1/0603; F01B1/061; F01B1/0617
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
327 words
Apparatus having interconnected hydraulic units, comprising first and second hydraulic units including stator means having a journal with an axis and being formed with duct means having ports and including inlet and outlet ducts, and first and second rotary means including first and second rotary cylinder means mounted on said journal for rotation about said axis and having first and second radial chambers communicating with said ports of said duct means, and first and second piston means mounted in said chambers of said first and second cylinder means, respectively, for radial movement toward and away from said axis; drive means for driving said first rotary means; guide means mounted on said stator means for operating said first and second piston means during rotation of said first and second cylinder means, respectively; connecting means having an engaged position mechanically connecting said first and second rotary cylinder means for rotation, and a disengaged position; consumer conduit means; valve means connecting said duct means with said consumer conduit means and having a first control position for guiding pressure fluid from both said first and second hydraulic units through said duct means to said consumer conduit means while said connecting means is in said engaged position, and a second control position for guiding pressure fluid only from said first unit through said duct means to said consumer conduit means while said connecting means is in said disengaged position, and a third control position closing said consumer conduit means and connecting said inlet and outlet ducts with each other while said connecting means is in said disengaged position so that the pressure fluid discharged from said first hydraulic unit flows into said second hydraulic unit and operates the same as a hydraulic motor whereby said first and second hydraulic units form a hydrostatic transmission; and operating means for placing said connecting means selectively in said engaged and disengaged positions, and said valve means selectively in said first, second, and third control positions.
Claim 2
Dependent Claim
327 words
Apparatus having interconnected hydraulic units, comprising first and second hydraulic units including stator means having a journal with an axis and being formed with duct means having ports and including inlet and outlet ducts, and first and second rotary means including first and second rotary cylinder means mounted on said journal for rotation about said axis and having first and second radial chambers communicating with said ports of said duct means, and first and second piston means mounted in said chambers of said first and second cylinder means, respectively, for radial movement toward and away from said axis; drive means for driving said first rotary means; guide means mounted on said stator means for operating said first and second piston means during rotation of said first and second cylinder means, respectively; connecting means having an engaged position mechanically connecting said first and second rotary cylinder means for rotation, and a disengaged position; consumer conduit means; valve means connecting said duct means with said consumer conduit means and having a first control position for guiding pressure fluid from both said first and second hydraulic units through said duct means to said consumer conduit means while said connecting means is in said engaged position, and a second control position for guiding pressure fluid only from said first unit through said duct means to said consumer conduit means while said connecting means is in said disengaged position, and a third control position closing said consumer conduit means and connecting said inlet and outlet ducts with each other while said connecting means is in said disengaged position so that the pressure fluid discharged from said first hydraulic unit flows into said second hydraulic unit and operates the same as a hydraulic motor whereby said first and second hydraulic units form a hydrostatic transmission; and operating means for placing said connecting means selectively in said engaged and disengaged positions, and said valve means selectively in said first, second, and third control positions.
Claim 3
Dependent Claim
34 words
Apparatus as claimed in claim 1, wherein said first and second cylinder means have confronting radial faces; and wherein said connecting means include first and second coupling means respectively mounted on said radial faces.
Claim 4
Dependent Claim
50 words
Apparatus as claimed in claim 1, wherein said second rotary means includes a first gear, and comprising an output shaft, and a second gear on said output shaft meshing with said first gear so that said output shaft is driven by said second hydraulic unit operating as a hydraulIc motor.
Claim 5
Dependent Claim
88 words
Apparatus as claimed in claim 3, wherein said second rotary means is mounted on said journal for axial movement; wherein said operating means include a fork means engaging said first gear for shifting the same with said second rotary cylinder means toward and away from said first rotary cylinder means; and wherein said connecting means include first and second coupling means on said first and second rotary cylinder means engaging each other in said engaged position when said second cylinder means is displaced toward said first cylinder means.
Claim 6
Dependent Claim
18 words
Apparatus as claimed in claim 4 wherein said first and second coupling means have interengaging projections and recesses.
Claim 7
Dependent Claim
21 words
Apparatus as claimed in claim 4 wherein said first and second coupling means frictionally engage each other in said engaged position.
Claim 8
Dependent Claim
168 words
Apparatus as claimed in claim 1 wherein said inlet and outlet ducts include first and second ducts communicating with said first and second chambers, respectively; wherein said valve means has a third control position for connecting said first ducts of said first hydraulic unit with said second ducts of said second hydraulic unit while said connecting means is in said disengaged position so that pressure fluid discharged from said first hydraulic unit flows into said second hydraulic unit operating the same as a hydraulic motor; comprising a container for fluid; and wherein said valve means includes a valve cylinder having a first port connected with said consumer conduit means, a second port communicating with said container, and with a first duct of said first hydraulic unit, and a third port communicating with a second duct of said second hydraulic unit, and a valve slide movable in said valve cylinder between said first, second, and third control positions and controlling the flow through said first, second, and third ports.
Claim 9
Dependent Claim
44 words
Apparatus as claimed in claim 7, comprising a casing supporting said stator means; wherein said journal is fixedly secured to said casing and has a portion projecting out of said casing; and wherein said valve means is mounted on said portion of said journal.
Claim 10
Dependent Claim
54 words
Apparatus as claimed in claim 7 comprising an auxiliary pump; and a valve having a first position connecting said auxiliary pump with said first and second rotary hydraulic units, and a second position disconnecting said auxiliary pump from said first and second units, and connecting said first and second hydraulic units with said container.
Claim 11
Dependent Claim
21 words
Apparatus as claimed in claim 9 comprising check valve means between said auxiliary pump and said first and second hydraulic units.
Claim 12
Dependent Claim
40 words
Apparatus as claimed in claim 10 comprising a conduit connecting said second port of said valve cylinder with said valve and said valve with said container; and another check valve in said conduit between said second port and said valve.
Claim 13
Dependent Claim
44 words
Apparatus as claimed in claim 11 wherein said operating means include first electromagnetic means for moving said valve means between said first, second, and third control positions, said second electromagnetic means for moving said valve between said first and second positions of the same.
Claim 14
Dependent Claim
33 words
Apparatus as claimed in claim 1 comprising an output shaft driven from said second rotary means; a machine shaft; and coupling means for connecting and disconnecting said output shaft and said machine shaft.
Claim 15
Dependent Claim
319 words
Apparatus having interconnected hydraulic units, comprising first and second hydraulic units including stator means having a journal with an axis and being formed with duct means having ports, and first and second rotary means including first and second rotary cylinder means mounted on said journal for rotation about said axis and having first and second radial chambers communicating with said ports of said duct means, and first and second piston means mounted in said chambers of said first and second cylinder means, respectively, for radial movement toward and away from said axis, said first and second cylinDer means having confronting radial faces; drive means for driving said first rotary means; guide means mounted on said stator means for operating said first and second piston means during rotation of said first and second cylinder means, respectively; connecting means having an engaged position mechanically connecting said first and second rotary cylinder means for rotation, and a disengaged position, said connecting means including first and second coupling means respectively mounted on said radial faces; one of said cylinder means being mounted on said journal for movement in axial direction with the respective coupling means so that the same engages the other coupling means in said engaged position of said connecting means; consumer conduit means; valve means connecting said duct means with said consumer conduit means and having a first control position for guiding pressure fluid from both said first and second hydraulic units through said duct means to said consumer conduit means while said connecting means is in said engaged position, and at least a second control position for guiding pressure fluid only from said first unit through said duct means to said consumer conduit means while said connecting means is in said disengaged position; and operating means for placing said connecting means selectively in said engaged and disengaged positions, and said valve means selectively in said first, and second control positions.
Claim 16
Dependent Claim
319 words
Apparatus having interconnected hydraulic units, comprising first and second hydraulic units including stator means having a journal with an axis and being formed with duct means having ports, and first and second rotary means including first and second rotary cylinder means mounted on said journal for rotation about said axis and having first and second radial chambers communicating with said ports of said duct means, and first and second piston means mounted in said chambers of said first and second cylinder means, respectively, for radial movement toward and away from said axis, said first and second cylinDer means having confronting radial faces; drive means for driving said first rotary means; guide means mounted on said stator means for operating said first and second piston means during rotation of said first and second cylinder means, respectively; connecting means having an engaged position mechanically connecting said first and second rotary cylinder means for rotation, and a disengaged position, said connecting means including first and second coupling means respectively mounted on said radial faces; one of said cylinder means being mounted on said journal for movement in axial direction with the respective coupling means so that the same engages the other coupling means in said engaged position of said connecting means; consumer conduit means; valve means connecting said duct means with said consumer conduit means and having a first control position for guiding pressure fluid from both said first and second hydraulic units through said duct means to said consumer conduit means while said connecting means is in said engaged position, and at least a second control position for guiding pressure fluid only from said first unit through said duct means to said consumer conduit means while said connecting means is in said disengaged position; and operating means for placing said connecting means selectively in said engaged and disengaged positions, and said valve means selectively in said first, and second control positions.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |