US3747722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic auxiliary drive for vehicles
Assignee: Individual
•
Filing: 1971-06-10
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Granted: 1973-07-24
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Expires: 1991-06-10
Abstract
Abstract A hydraulic auxiliary drive system which derives power from the driven wheels of a vehicle and applies that power to the normally non-driven wheels of the vehicle, or of a trailer towed by the vehicle. The self-contained closed system includes hydraulic pump units which are simply bolted on the existing driven wheel mountings, and hydraulic motors which are bolted on the wheels to be driven. An actuating valve engages or disengages the drive and selection means is provided for applying the auxiliary power to the vehicle or trailer, as required. When not in use the system does not affect normal performance of the vehicle.
Inventors
- 👤 F Finney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
B; B60; B60K; B60K17/00; B60K17/34; B60K17/356
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
A hydraulic auxiliary drive system for a vehicle having driven wheels and non-driven wheels, the system comprising: a hydraulic pump mounted on each of said driven wheels; a hydraulic motor mounted on each of said non-driven wheels; closed fluid conducting circuit means interconnecting each pump with an associated motor on the same side of the vehicle; each pump and motor having a selectively operable driving connection with the respective wheel; and control means for selectively engaging and disengaging the driving connections of said pumps and motors with the respective wheels.
Claim 2
Dependent Claim
90 words
A hydraulic auxiliary drive system for a vehicle having driven wheels and non-driven wheels, the system comprising: a hydraulic pump mounted on each of said driven wheels; a hydraulic motor mounted on each of said non-driven wheels; closed fluid conducting circuit means interconnecting each pump with an associated motor on the same side of the vehicle; each pump and motor having a selectively operable driving connection with the respective wheel; and control means for selectively engaging and disengaging the driving connections of said pumps and motors with the respective wheels.
Claim 3
Dependent Claim
46 words
The system according to claim 1 and including: an external coupling connector block mounted on the vehicle with fluid conducting means connected to said pump; and a selector valve in said fluid conducting circuit means for selectively conducting fluid to said motor and said connecting block.
Claim 4
Dependent Claim
73 words
The system according to claim 1, wherein each of said pumps comprises a ring-like housing concentric with and fixed relative to the respective wheel, and a rotor in said housing; a drive disc secured to the wheel to rotate therewith and having sockets therein; and said control means including drive pins connected to said rotor, and means to extend said drive pins to engage said sockets and couple the rotor and drive disc.
Claim 5
Dependent Claim
60 words
The system according to claim 3, wherein said drive pins are slidably mounted in said rotor and biased to retracted position therein; said means to extend comprising fluid pressure means coupled to the fluid in said pump for extending said drive pins; and actuating means for applying initial pressure to the fluid in said pump to extend the drive pins.
Claim 6
Dependent Claim
43 words
The system according to claim 4, wherein said actuating means includes a control valve in said closed fluid conducting circuit means, said valve having piston means movable to displace sufficient fluid in the closed circuit to hold said drive pins in extended position.
Claim 7
Dependent Claim
77 words
The system according to claim 5, wherein each of said motors comprises a ring-like housing concentric with and fixed relative to the respective wheel and a rotor in said housing; a drive disc secured to the wheel to rotate therewith, and having sockets therein; and said control means including drive pins connected to said rotor, and means to extend said drive pins to engage said sockets and couple the last mentioned rotor and the associated drive disc.
Claim 8
Dependent Claim
40 words
The system according to claim 6, wherein said last mentioned drive pins are slidably mounted in the motor rotor and biased to retracted position therein; said means to extend comprising fluid pressure means coupled to the fluid in said motor.
Claim 9
Dependent Claim
80 words
The system according to claim 1, wherein said closed fluid conducting circuit means has a constant volume of fluid completely filling the circuit; said driving connections being operable by fluid pressure in the circuit for coupling said pumps and motors with the respective wheels; said control means including actuating means for applying initial pressure in the circuit, comprising a control valve in the circuit having piston means movable to displace a volume of fluid sufficient to engage said driving connections.
Claim 10
Dependent Claim
38 words
The system of claim 8, wherein said control valve is coupled to said pumps to actuate the drive connecting means therein, the drive connecting means in said motors being actuated by fluid pressure generated therein by said pumps.
Claim 11
Dependent Claim
23 words
The system according to claim 8, and including a lever connected to said piston means for holding the same in the pressurizing position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |