US3865207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic feed for wheel motors
Assignee: Hyster Co
•
Filing: 1973-06-11
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Granted: 1975-02-11
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Expires: 1993-06-11
Abstract
Abstract A rough terrain vehicle has a conventional engine-driven primary drive system and an auxiliary hydrostatic assist drive system having a higher ratio drive than the primary drive system. Thus in the assist system, wheel motors in the normally undriven wheels provide traction assist for the primary drivers only when and as needed. An engine-driven pump supplies pressure fluid to the wheel motors through the pivot joint between the vehicle''s steering axle and the wheel spindle trunnions. A manually operated forward-reverse master control valve selectively energizes a hydraulic control circuit for the assist system including pressure-operated power control and shorting valves to ensure adequate supply of fluid to the wheel motors to meet demand under various modes of operation. The circuit enables five modes of operation, including a neutral mode, powered forward and reverse modes, a retard mode and an overrun mode. A motor circuit pressure-operated clutch modulator valve controls the engagement of a fluid activated friction clutch between each wheel motor and its driven wheel in a manner so that the clutch is variably engaged or disengaged automatically as dictated by the need for traction assist.
Inventors
- 👤 Delmar G Schwab
- 👤 Dennis P Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:35
CPC Classifications
B; B60; B60K; B60K17/00; B60K17/04; B60K17/14; B60K17/34; B60K17/356
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
262 words
In a vehicle having a main frame, steerable wheel means connected by trunnion means to an axle means for pivoting movement about an axis of said trunnion means, a hydraulic drive arrangement for said steerable wheel means comprising: hydraulic motor means mounted within said wheel means for driving said wheel means, hydraulic pump means on said frame remote from said motor means, hydraulic fluid passage means interconnecting said pump and motor means, said fluid passage means including internal passageway means extending within said trunnion means into communication with said motor means, and conduit means extending from said pump means on said frame to said axle means, coupling means on said axle means interconnecting said conduit means and said internal passageway means in a manner permitting pivoting movement of said trunnion means unrestricted by said conduit means, said coupling means including a cap member stationarily mounted on said axle means, said cap member including internal passage means in communication with said conduit means, a rigid rotatable sleeve member interconnecting said cap member and said trunnion means, said rigid rotatable sleeve member extending within adjacent end portions of said internal trunnion passage means and said internal cap passage means, said rigid rotatable sleeve member permitting relative rotation betWeen said cap member and said trunnion means and comprising an interconnecting fluid passage between said cap passage means and said trunnion passage means, and said rigid rotatable sleeve member including means providing a fluid seal between said rigid rotatable sleeve member and said cap member and between said rigid rotatable sleeve member and said trunnion means.
Claim 2
Dependent Claim
262 words
In a vehicle having a main frame, steerable wheel means connected by trunnion means to an axle means for pivoting movement about an axis of said trunnion means, a hydraulic drive arrangement for said steerable wheel means comprising: hydraulic motor means mounted within said wheel means for driving said wheel means, hydraulic pump means on said frame remote from said motor means, hydraulic fluid passage means interconnecting said pump and motor means, said fluid passage means including internal passageway means extending within said trunnion means into communication with said motor means, and conduit means extending from said pump means on said frame to said axle means, coupling means on said axle means interconnecting said conduit means and said internal passageway means in a manner permitting pivoting movement of said trunnion means unrestricted by said conduit means, said coupling means including a cap member stationarily mounted on said axle means, said cap member including internal passage means in communication with said conduit means, a rigid rotatable sleeve member interconnecting said cap member and said trunnion means, said rigid rotatable sleeve member extending within adjacent end portions of said internal trunnion passage means and said internal cap passage means, said rigid rotatable sleeve member permitting relative rotation betWeen said cap member and said trunnion means and comprising an interconnecting fluid passage between said cap passage means and said trunnion passage means, and said rigid rotatable sleeve member including means providing a fluid seal between said rigid rotatable sleeve member and said cap member and between said rigid rotatable sleeve member and said trunnion means.
Claim 3
Dependent Claim
63 words
A hydraulic drive arrangement according to claim 1 wherein said internal passageway means includes a port in an exterior surface portion of said trunnion means, said cap member being spaced apart from said trunnion means, said rigid sleeve member extending within said space between said cap member and said trunnion means and being rotatable relative to said cap member and said trunnion means.
Claim 4
Dependent Claim
64 words
A hydraulic drive arrangement according to claim 1 wherein said wheel means includes a wheel hub mounted for rotation on a wheel spindle means, said spindle means being rigidly connected to said trunnion means, said hydraulic motor means being mounted within said spindle means, said internal passageway means including a passageway portion extending within said spindle means into communication with said wheel motor means.
Claim 5
Dependent Claim
109 words
A hydraulic drive arrangement according to claim 1 wherein said wheel means includes a pair of said steerable wheel means mounted at opposite ends of said axle means by a pair of said trunnion means, a pair of said hydraulic motor means one within each said wheel means, junction box means on said axle means, said conduit means including first conduit means extending between said pump means and said junction box and second conduit means extending between said junction box means and each of said trunnion means, said junction box means including means dividing the flow of pressure fluid from said pump means between said pair of hydraulic motors.
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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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |