US3655004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically driven vehicle
Assignee: Komatsu Ltd
•
Filing: 1970-02-16
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Granted: 1972-04-11
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Expires: 1990-02-16
Abstract
Abstract The hydraulically driven vehicle of the wheeled vehicle type or the crawler vehicle type, provided with a short-circuit line between a pair of main passages for the liquid medium for communicating them with each other only during the operating lever is in neutral position, a braking system operable for the same period with the above, a tracting starting system which generates a difference in pressure between the pair of main passages when the hydraulic motor is reversely driven, and, in case of the crawler vehicle type, a pair of short lines connecting the higher pressured sides of said pair of main passages with each other and the lower pressured sides thereof with each other, respectively, and a friction clutch associating the two output shafts with each other, only during the two operating levers are in parallel.
Inventors
- 👤 Kenzo Hoashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:00
CPC Classifications
B; B60; B60K; B60K17/00; B60K17/04; B60K17/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
250 words
In a hydraulically driven vehicle comprising a main engine, at least a hydraulic power transmission system, and an auxiliary fixed displacement pump, said hydraulic power transmission system comprising at least one variable displacement hydraulic pump, at least one hydraulic motor, and at least one pair of main passages for a liquid medium connecting said hydraulic pump with said hydraulic motor, said variable displacement hydraulic pump being mechanically driven by said main engine and hydraulically controlled by a pump-and-motor controlling means mechanically controlled by at least one operating lever, said hydraulic motor being adapted to drive at least a driving wheel, and said auxiliary fixed displacement pump being adapted to be mechanically driven by said main engine for supplying said liquid medium to said hydraulic power transmission system, a short-circuit line for said liquid medium inserted between said pair of main passages in response to operation of said operating lever, said hydraulic power transmission system being doubled into two identical systems independent of each other, and comprising a pair of said short-circuit lines which connect the higher pressured ones of said two pairs of main passages with each other and the lower pressured ones thereof, with each other, respectively, a pair of valve means respectively situated in said pair of short-circuit lines for opening and closing the latter, and means for responding only when said two operating levers are positioned correspondingly to each other for placing said pair of valve means respectively in said pair of short-circuit lines in open positions.
Claim 2
Dependent Claim
250 words
In a hydraulically driven vehicle comprising a main engine, at least a hydraulic power transmission system, and an auxiliary fixed displacement pump, said hydraulic power transmission system comprising at least one variable displacement hydraulic pump, at least one hydraulic motor, and at least one pair of main passages for a liquid medium connecting said hydraulic pump with said hydraulic motor, said variable displacement hydraulic pump being mechanically driven by said main engine and hydraulically controlled by a pump-and-motor controlling means mechanically controlled by at least one operating lever, said hydraulic motor being adapted to drive at least a driving wheel, and said auxiliary fixed displacement pump being adapted to be mechanically driven by said main engine for supplying said liquid medium to said hydraulic power transmission system, a short-circuit line for said liquid medium inserted between said pair of main passages in response to operation of said operating lever, said hydraulic power transmission system being doubled into two identical systems independent of each other, and comprising a pair of said short-circuit lines which connect the higher pressured ones of said two pairs of main passages with each other and the lower pressured ones thereof, with each other, respectively, a pair of valve means respectively situated in said pair of short-circuit lines for opening and closing the latter, and means for responding only when said two operating levers are positioned correspondingly to each other for placing said pair of valve means respectively in said pair of short-circuit lines in open positions.
Claim 3
Dependent Claim
247 words
In a hydraulically driven vehicle comprising a main engine, at least a hydraulic power transmission system, and an auxiliary fixed displacement pump, said hydraulic power transmission system comprising at least one variable displacement hydraulic pump, at least one hydraulic motor, and at least one pair of main passages for a liquid medium connecting said hydraulic pump with said hydraulic motor, said variable displacement hydraulic pump being mechanically driven by said main engine and hydraulically controlled by a pump-and-motor controlling means mechanically controlled by at least one operating lever, said hydraulic motor being adapted to drive at least a driving wheel, and said auxiliary fixed displacement pump being adapted to be mechanically driven by said main engine for supplying said liquid medium to said hydraulic power transmission system, a short-circuit line for said liquid medium inserted between said pair of main passages in response to operation of said operating lever, said hydraulic power transmission system being doubled into two identical systems independent of each other, and comprising a pair of said short-circuit lines which connect the higher pressured ones of said two pairs of main passages with each other and the lower pressured ones thEreof, with each other, respectively, only when said two operating levers are positioned correspondingly to each other, a pair of short valves being inserted into said pair of short lines, respectively, and electromagnetically controlled form a switching means adapted to make an electric circuit in response to the corresponding positioning of said operating levers.
Claim 4
Dependent Claim
247 words
In a hydraulically driven vehicle comprising a main engine, at least a hydraulic power transmission system, and an auxiliary fixed displacement pump, said hydraulic power transmission system comprising at least one variable displacement hydraulic pump, at least one hydraulic motor, and at least one pair of main passages for a liquid medium connecting said hydraulic pump with said hydraulic motor, said variable displacement hydraulic pump being mechanically driven by said main engine and hydraulically controlled by a pump-and-motor controlling means mechanically controlled by at least one operating lever, said hydraulic motor being adapted to drive at least a driving wheel, and said auxiliary fixed displacement pump being adapted to be mechanically driven by said main engine for supplying said liquid medium to said hydraulic power transmission system, a short-circuit line for said liquid medium inserted between said pair of main passages in response to operation of said operating lever, said hydraulic power transmission system being doubled into two identical systems independent of each other, and comprising a pair of said short-circuit lines which connect the higher pressured ones of said two pairs of main passages with each other and the lower pressured ones thEreof, with each other, respectively, only when said two operating levers are positioned correspondingly to each other, a pair of short valves being inserted into said pair of short lines, respectively, and electromagnetically controlled form a switching means adapted to make an electric circuit in response to the corresponding positioning of said operating levers.
Claim 5
Dependent Claim
42 words
The combination of claim 2, and which further comprises a friction clutch adapted to connect two output shafts of said hydraulic motors with each other and hydraulically operated by said liquid medium intermediate a change-over valve electromagnetically controlled form said switching means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |