US3884095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damper mechanism for hydrostatic transmission
Assignee: Aisin Corp
•
Filing: 1973-07-17
•
Granted: 1975-05-20
•
Expires: 1993-07-17
Abstract
Abstract A hydrostatic transmission comprising an input shaft, an output shaft, a differential gear set, two pump-motors hydraulically connected to each other by a pair of hydraulic circuits, and being selectively associated with the input shaft, the output shaft and the differential gear set, and a hydraulic damper mechanism arranged between the pair of hydraulic circuits.
Inventors
- 👤 Takayuki Miyao
- 👤 Hiroaki Maeda
- 👤 Masanori Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:54
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/02; F16H47/04; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H2037/088; F16H2037/0886
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
In a hydrostatic transmission comprising an input shaft, an output shaft, a differential gear set between said shafts, and two pump-motors hydraulically connected to each other by first and second hydraulic circuits, said pump-motors being adapted for selectively associating with said input shaft, said output shaft and said differential gear set to provide a plurality of speed range drives, the improvement comprising a damper mechanism arranged between said first and second hydraulic circuits for interrupting hydraulic communication therebetween and for absorbing any vibrations of hydraulic pressure when a sudden change of hydraulic pressure occurs in at least one of said first and second circuits.
Claim 2
Dependent Claim
104 words
In a hydrostatic transmission comprising an input shaft, an output shaft, a differential gear set between said shafts, and two pump-motors hydraulically connected to each other by first and second hydraulic circuits, said pump-motors being adapted for selectively associating with said input shaft, said output shaft and said differential gear set to provide a plurality of speed range drives, the improvement comprising a damper mechanism arranged between said first and second hydraulic circuits for interrupting hydraulic communication therebetween and for absorbing any vibrations of hydraulic pressure when a sudden change of hydraulic pressure occurs in at least one of said first and second circuits.
Claim 3
Dependent Claim
59 words
A damper mechanIsm as set forth in claim 1, comprising a passage for establishing the hydraulic communication between said circuits, a housing positioned in said passage, a piston slidably mounted within said housing to provide first and second chambers therein, said first chamber being connected to said first circuit and said second chamber being connected to said second circuit.
Claim 4
Dependent Claim
69 words
A damper mechanism as set forth in claim 2, wherein said first chamber is connected to said first circuit through two conduits, one of said conduits having a check valve therein and the other having an orifice therein, and said second chamber are connected to said second circuit through two conduits, one of said last-mentioned two conduits having a check valve therein and the other having an orifice therein.
Claim 5
Dependent Claim
18 words
A damper mechanism as set forth in claim 2, wherein said piston is biased by two spring means.
Claim 6
Dependent Claim
68 words
A damper mechanism as set forth in claim 1, comprising a passage for establishing the hydraulic communication between said circuits, a housing positioned in said passage, a first piston slidably mounted within said housing and having a bore, and a second piston slidably mounted within said bore of said first piston, said second piston comprising portions cooperating with corresponding parts of said housing for controlling said hydraulic communication.
Claim 7
Dependent Claim
19 words
A damper mechanism as set forth in claim 5, wherein said portions of said second piston have tapering ends.
Claim 8
Dependent Claim
31 words
A damper mechanism as set forth in claim 6, wherein said portions of said second piston have shoulders which are in contact with seats of said corresponding parts of said housing.
References Cited (Backward Citations)
US1959889A
Cited
US2353304A
Cited
US2809666A
Cited
US3085796A
Cited
US3241464A
Cited
US3348579A
Cited
US3385169A
Cited
US3648570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |