Patent US4175389A successfully refreshed from Google Patents.
US4175389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydromechanical transmission
Assignee: TIMETZ Ltd A CORP OF ISRAEL
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Filing: 1978-02-06
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Granted: 1979-11-27
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Expires: 1998-02-06
Abstract
Abstract A gearless split torque hydromechanical transmission with regenerative braking and engine starting capabilities comprising two hydraulic pumps tied together by a one-way clutch.
Inventors
- 👤 Samuel Shiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:27
CPC Classifications
B; B60; B60W; B60W30/00; B60W30/18; B60W30/18009; B60W30/18109; B60W30/18127; B60W10/00; B60W10/10; B60W10/101; B60W10/103; B60W10/18; F; F16; F16H; F16H39/00; F16H39/04; F16H39/06; F16H39/08; F16H39/10; F16H39/14; B60K; B60K6/00; B60K6/08; B60K6/12; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40; Y02T10/60; Y02T10/62; Y02T10/80; Y02T10/84
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
A hydrostatic transmission adapted for a plurality of operational modes, comprising in combinations: a first pump having a first section serving as a mechanical input member of said transmission, a second section, and inlet port and an outlet port, a second variable displacement pump (motor) having a first portion, serving as a mechanical output member of said transmission, coupled to said second section by clutch means, a second anchored portion, a suction port and a discharge port, an accumulator for storing fluid under pressure, and control means connected to said ports and said accumulator via conduits.
Claim 2
Dependent Claim
96 words
A hydrostatic transmission adapted for a plurality of operational modes, comprising in combinations: a first pump having a first section serving as a mechanical input member of said transmission, a second section, and inlet port and an outlet port, a second variable displacement pump (motor) having a first portion, serving as a mechanical output member of said transmission, coupled to said second section by clutch means, a second anchored portion, a suction port and a discharge port, an accumulator for storing fluid under pressure, and control means connected to said ports and said accumulator via conduits.
Claim 3
Dependent Claim
14 words
A transmission as in claim 1 wherein said clutch means comprise a one-way clutch.
Claim 4
Dependent Claim
15 words
A transmission as in claim 1 wherein said first pump is a variable displacement pump.
Claim 5
Dependent Claim
29 words
A transmission as in claim 1, wherein said control means blocks said outlet port to effect a direct coupling of said mechanical input member to said mechanical output member.
Claim 6
Dependent Claim
23 words
A transmission as in claim 1, wherein said control means connects said outlet port to said suction port to effect a reduction ratio.
Claim 7
Dependent Claim
23 words
A transmission as in claim 1, wherein said control means connects said discharge port to said outlet port to effect an overdrive ratio.
Claim 8
Dependent Claim
26 words
A transmission as in claim 1, wherein said control means connects said discharge port to said accumulator to effect regenerative braking of said mechanical output member.
Claim 9
Dependent Claim
32 words
A transmission as in claim 1, with brake means for selectively anchoring said second section while said control means connects said inlet port to said accumulator for rotating said mechanical input member.
Claim 10
Dependent Claim
30 words
A transmission as in claim 1 with brake means for selectively anchoring said second section while said control means connects said outlet port, said suction port and said accumulator together.
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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |