US3765183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously variable hydrostatic transmission
Assignee: Robert Bosch GmbH
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Filing: 1972-08-15
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Granted: 1973-10-16
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Expires: 1992-08-15
Abstract
Abstract A hydrostatic transmission includes two axially aligned radial piston machines operating as a pump and motor, and having cylinder blocks secured to a housing and to an output shaft, respectively, and actuator rings whose eccentricities are simultaneously adjusted by adjusting means surrounding the actuator means and connected therewith by cam slots and cam followers so that power can be hydraulically and mechanically transmitted between the input and output shafts.
Inventors
- 👤 H Baurle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:06
CPC Classifications
F; F16; F16H; F16H39/00; F16H39/04; F16H39/06; F16H39/08; F16H39/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
181 words
Continuously variable hydrostatic transmission comprising housing means; input and output shafts coaxially mounted in said housing means for rotation about an axis; first and second radial piston machines including first and second cylinder blocks mounted on said input and output shafts, respectively, and having radial cylinders, first and second pistons mounted in said radial cylinders of said first and second cylinder blocks, and first and second actuator rings surrounding said first and second cylinder blocks and being slidably engaged by said first and second pistons, respectively, said first cylinder block being fixedly secured to said input shaft for rotation, and said second cylinder block being fixedly secured to said housing means; adjusting means mounted on said output shaft between said first and second cylinder blocks, and being connected with said output shaft for rotation, and for axial adjustment movement, said adjusting means being operatively connected with said first and second actuator rings for displacing the same between adjusted positions in which eccentricities of said actuator rings relative to said axis are different; and operating means for axially displacing said adjusting means.
Claim 2
Dependent Claim
181 words
Continuously variable hydrostatic transmission comprising housing means; input and output shafts coaxially mounted in said housing means for rotation about an axis; first and second radial piston machines including first and second cylinder blocks mounted on said input and output shafts, respectively, and having radial cylinders, first and second pistons mounted in said radial cylinders of said first and second cylinder blocks, and first and second actuator rings surrounding said first and second cylinder blocks and being slidably engaged by said first and second pistons, respectively, said first cylinder block being fixedly secured to said input shaft for rotation, and said second cylinder block being fixedly secured to said housing means; adjusting means mounted on said output shaft between said first and second cylinder blocks, and being connected with said output shaft for rotation, and for axial adjustment movement, said adjusting means being operatively connected with said first and second actuator rings for displacing the same between adjusted positions in which eccentricities of said actuator rings relative to said axis are different; and operating means for axially displacing said adjusting means.
Claim 3
Dependent Claim
72 words
Hydrostatic transmission as claimed in claim 1 wherein said first and second cylinder blocks have inner circular surfaces in sliding engagement with the outer surface of said output shaft, and ducts connected with said cylinders, and opening in first and second ports on said inner circular surfaces, and wherein said output shaft has conduit means opening on said outer surface of said output shaft and communicating with said first and second ports.
Claim 4
Dependent Claim
69 words
Hydrostatic transmission as claimed in claim 1 wherein said adjusting means includes an annular central portion mounted on said output shaft, and first and second tubular end portions at least partly surrounding said first and second actuator rings, respectively, and having first and second cam slots; and wherein said first and second actuator rings have first and second follower means guided in said first and second cam slots, respectively.
Claim 5
Dependent Claim
68 words
Hydrostatic transmission as claimed in claim 3 wherein said operating means include a control shaft mounted on said housing means for turning movement, a forked lever secured to said control shaft and slidingly embracing an annular groove in said central portion of said annular adjusting means so that by turning of said control shaft, said annular adjusting means is axially displaced with said first and second cam slots.
Claim 6
Dependent Claim
59 words
Hydrostatic transmission as claimed in claim 4 comprising a first pivot means mounted on said housing means, and supporting said first actuator ring For angular movement between said adjusting positions; and a second pivot means mounted on said second tubular end portion of said adjusting means and supporting said second actuator ring for angular movement between said adjusted positions.
Claim 7
Dependent Claim
48 words
Hydrostatic transmission as claimed in claim 1 wherein said second block is mounted on said output shaft for relative rotation, and has axially projecting portions located in recesses formed in said housing means for blocking rotation of said second cylinder block so that said second actuator ring rotates.
Claim 8
Dependent Claim
97 words
Hydrostatic transmission as claimed in claim 1 wherein said first and second cylinder blocks have inner circular surfaces in sliding engagement with the outer surface of said output shaft, and ducts connected with said cylinders and opening in first and second ports on said inner circular surface; wherein said output shaft has conduit means opening on said outer surface of said output shaft and communicating with said first and second ports, and with a channel in said housing means; comprising a check valve between said conduit means and said channel; and a pump connected with said channel.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |