GB2058300A - Wheeled vehicle with hydrostatic transmission - Google Patents

Wheeled vehicle with hydrostatic transmission Download PDF

Info

Publication number
GB2058300A
GB2058300A GB8020586A GB8020586A GB2058300A GB 2058300 A GB2058300 A GB 2058300A GB 8020586 A GB8020586 A GB 8020586A GB 8020586 A GB8020586 A GB 8020586A GB 2058300 A GB2058300 A GB 2058300A
Authority
GB
United Kingdom
Prior art keywords
vehicle
hydraulic
wheels
motors
drive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8020586A
Other versions
GB2058300B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HAINAUT SAMBRE SA
Original Assignee
HAINAUT SAMBRE SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HAINAUT SAMBRE SA filed Critical HAINAUT SAMBRE SA
Publication of GB2058300A publication Critical patent/GB2058300A/en
Application granted granted Critical
Publication of GB2058300B publication Critical patent/GB2058300B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D11/00—Steering non-deflectable wheels; Steering endless tracks or the like
    • B62D11/02—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides
    • B62D11/06—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source
    • B62D11/10—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears
    • B62D11/14—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears differential power outputs being effected by additional power supply to one side, e.g. power originating from secondary power source
    • B62D11/18—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears differential power outputs being effected by additional power supply to one side, e.g. power originating from secondary power source the additional power supply being supplied hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of fluid gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/14—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing the motor of fluid or electric gearing being disposed in or adjacent to traction wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/18—Understructures, i.e. chassis frame on which a vehicle body may be mounted characterised by the vehicle type and not provided for in groups B62D21/02 - B62D21/17

Abstract

Each drive wheel of a wheeled vehicle is driven by an associated individual hydraulic motor M1, M2, M3, M4. The motors M1, M2 and M3, M4 on respective sides of the vehicle are fed in series by respective pumps P1 and P2. A bypass BP guarantees the safety of the system in the case of overpressure. A discharge circuit DC communicates with reservoir R2 via radiator R1. <IMAGE>

Description

SPECIFICATION Wheeled vehicle The invention relates to a wheeled vehicle having a hydraulic drive.
In vehicles such as loaders, the assemblies formed by the wheels located on either side of the vehicle are independent from each other; this arrangement is suitable to ensure steering of the vehicle by separate action on each of these assemblies, but the wheels of the same assembly are advantageously dependent on one another so that the vehicle may be driven over all types of terrain.
Vehicles of this type provided with hydrostatic transmission are already known; in this case a main motor drives two hydraulic pumps which each supply a hydraulic motor controlling the assembly of the wheels located on the same side.
Transmission of the output of the hydraulic motor to the wheels of an assembly is carried out by a mechanical transmission, for example a chain.
Such mechanical transmission causes the known disadvantages which are inherent to this technique: frequency maintenance and adjustment, and considerable amount of space occupied, in order to ensure accurate reliability.
The present invention relates to a vehicle provided with a device ensuring the drive function of the wheels and the control of the wheels located on the same side by means which are substantially hydraulic, i.e. means which do not have recourse to mechanical transmission.
A device of this type has, in comparison withthose comprising a mechanical transmission, the advantage of greater simplicity, greater strength, and less exacting maintenance requirements, and is therefore of increased efficiency.
Accordingly, the wheeled vehicle of the invention comprises as many hydraulic motors as there are drive wheels and in that each wheel is moved individually by its hydraulic motor.
Preferably the hydraulic motors engage with the drive wheels of the vehicle at a ratio of 1/1.
Alternatively, the hydraulic motors may engage with the drive wheels through reducing gears incorporated in the wheel hubs.
The hydraulic motors preferably have a high torque and rotate at a low speed.
In one embodiment of the invention, the vehicle comprises hydraulic drive wheels, optionally provided with braking devices.
It is preferable to include means enabling the supply of the hydraulic motors to be inverted.
In an advantageous embodiment of the invention, the drive wheels located on the same side of the vehicle are hydraulically connected together, so as to constitute assemblies. In addition, the preferred vehicle is provided with means which enable the series supply to each hydraulic motor assembly to be regulated independently.
For example, means are provided which enable the series supply of each hydraulic motor assembly supplied by a single hydraulic pump to be regulated independently, or each hydraulic motor assembly is provided with its own hydraulic pump.
In addition, it is preferable to include a by-pass which ensures a secondary connection between the series supplies of the hydraulic motor assemblies in order to guarantee the safety of the system in the case of overpressure.
The invention will be described further, by way of example, with reference to the accompanying drawings, whose sole Figure diagrammatically illustrates the drive system of a wheeled vehicle.
A main motor MP, fixed to the chassis of the vehicle, drives two variable-flow hydraulic pumps P, and P2 located on a common shaft a. The hydraulic pumps P, and P2 supply in series lateral hydraulic motors M1, M2 and M3, M4 respectively.
Each of these motors drives a wheel (not shown).
The drawing, by way of example, relates to a vehicle of the known loader type having four pneumatic-tyred wheels, but the invention may be applied to all types of wheeled vehicles whatever the number of wheels.
Switching means L1 and L2 for inverting the supply to the hydraulic motors M1, M2and M3, M4 by the hydraulic pumps P and P2 enable the inversion of the direction of rotation of the motors M1, M2, on one hand, and M3, M4, on the other hand.
A by-pass BP ensures a secondary connection between the series supply of the hydraulic motors M1, M2 and the series supply of the hydraulic motors M3, M4 in order to guarantee the safety of the system in the case of overpressure.
The vehicle may be provided, as is usual in this technique, with a discharge circuit DC, a filter F, a cooling radiator R1, and a leakage flow recycling pump Po which draws hydraulic fluid from a tank R2.
The vehicle described above has the following advantages: 1 ) omission of mechanical transmission and, consequently, of its disadvantages, i.e. the use of rod linkages, lubrication of the chain and monitoring of its extension, monitoring of its wear, adjustment of its tension, chain breakages; 2) a decrease in the frequency and duration of maintenance of the power transmission system; since the moving components of this completely hydraulic system are constantly lubricated, such maintenance is limited to a periodic change of the lubricating fluid and to checking of the condition of the piping and connections; 3) increased resistance of the device to external factors; 4) increase of strength in operation; 5) a reduction in the space occupied by the transmission system, which enables the ground clearance of the vehicle to be improved and the space available for the driver's cabin to be increased.
1. A wheeled vehicle comprising drivvwheels and as many hydraulic motors as there are drive
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Wheeled vehicle The invention relates to a wheeled vehicle having a hydraulic drive. In vehicles such as loaders, the assemblies formed by the wheels located on either side of the vehicle are independent from each other; this arrangement is suitable to ensure steering of the vehicle by separate action on each of these assemblies, but the wheels of the same assembly are advantageously dependent on one another so that the vehicle may be driven over all types of terrain. Vehicles of this type provided with hydrostatic transmission are already known; in this case a main motor drives two hydraulic pumps which each supply a hydraulic motor controlling the assembly of the wheels located on the same side. Transmission of the output of the hydraulic motor to the wheels of an assembly is carried out by a mechanical transmission, for example a chain. Such mechanical transmission causes the known disadvantages which are inherent to this technique: frequency maintenance and adjustment, and considerable amount of space occupied, in order to ensure accurate reliability. The present invention relates to a vehicle provided with a device ensuring the drive function of the wheels and the control of the wheels located on the same side by means which are substantially hydraulic, i.e. means which do not have recourse to mechanical transmission. A device of this type has, in comparison withthose comprising a mechanical transmission, the advantage of greater simplicity, greater strength, and less exacting maintenance requirements, and is therefore of increased efficiency. Accordingly, the wheeled vehicle of the invention comprises as many hydraulic motors as there are drive wheels and in that each wheel is moved individually by its hydraulic motor. Preferably the hydraulic motors engage with the drive wheels of the vehicle at a ratio of 1/1. Alternatively, the hydraulic motors may engage with the drive wheels through reducing gears incorporated in the wheel hubs. The hydraulic motors preferably have a high torque and rotate at a low speed. In one embodiment of the invention, the vehicle comprises hydraulic drive wheels, optionally provided with braking devices. It is preferable to include means enabling the supply of the hydraulic motors to be inverted. In an advantageous embodiment of the invention, the drive wheels located on the same side of the vehicle are hydraulically connected together, so as to constitute assemblies. In addition, the preferred vehicle is provided with means which enable the series supply to each hydraulic motor assembly to be regulated independently. For example, means are provided which enable the series supply of each hydraulic motor assembly supplied by a single hydraulic pump to be regulated independently, or each hydraulic motor assembly is provided with its own hydraulic pump. In addition, it is preferable to include a by-pass which ensures a secondary connection between the series supplies of the hydraulic motor assemblies in order to guarantee the safety of the system in the case of overpressure. The invention will be described further, by way of example, with reference to the accompanying drawings, whose sole Figure diagrammatically illustrates the drive system of a wheeled vehicle. A main motor MP, fixed to the chassis of the vehicle, drives two variable-flow hydraulic pumps P, and P2 located on a common shaft a. The hydraulic pumps P, and P2 supply in series lateral hydraulic motors M1, M2 and M3, M4 respectively. Each of these motors drives a wheel (not shown). The drawing, by way of example, relates to a vehicle of the known loader type having four pneumatic-tyred wheels, but the invention may be applied to all types of wheeled vehicles whatever the number of wheels. Switching means L1 and L2 for inverting the supply to the hydraulic motors M1, M2and M3, M4 by the hydraulic pumps P and P2 enable the inversion of the direction of rotation of the motors M1, M2, on one hand, and M3, M4, on the other hand. A by-pass BP ensures a secondary connection between the series supply of the hydraulic motors M1, M2 and the series supply of the hydraulic motors M3, M4 in order to guarantee the safety of the system in the case of overpressure. The vehicle may be provided, as is usual in this technique, with a discharge circuit DC, a filter F, a cooling radiator R1, and a leakage flow recycling pump Po which draws hydraulic fluid from a tank R2. The vehicle described above has the following advantages: 1 ) omission of mechanical transmission and, consequently, of its disadvantages, i.e. the use of rod linkages, lubrication of the chain and monitoring of its extension, monitoring of its wear, adjustment of its tension, chain breakages; 2) a decrease in the frequency and duration of maintenance of the power transmission system; since the moving components of this completely hydraulic system are constantly lubricated, such maintenance is limited to a periodic change of the lubricating fluid and to checking of the condition of the piping and connections; 3) increased resistance of the device to external factors; 4) increase of strength in operation; 5) a reduction in the space occupied by the transmission system, which enables the ground clearance of the vehicle to be improved and the space available for the driver's cabin to be increased. CLAIMS
1. A wheeled vehicle comprising drivvwheels and as many hydraulic motors as there are drive wheels, each drive wheel being driven individually by a respective one of the hydraulic motors.
2. A vehicle as claimed in claim 1, in which the hydraulic motors drive the respective drive wheels at a ratio of 1/1.
3. A vehicle as claimed in claim 1, in which the hydraulic motors drive the respective drive wheels through respective reducing gears mounted in respective hubs of the wheels.
4. A vehicle as claimed in any of claims 1 to 3, in which the hydraulic motors are high torque low speed motors.
5. A vehicle as claimed in any of claims 1 to 4, comprising hydraulic drive-wheels.
6. A vehicle as claimed in claim 5, in which the hydraulic drive-wheels include braking devices.
7. A vehicle as claimed in any of claims 1 to 6, including means for reversing the feed to the hydraulic motors.
8. A vehicle as claimed in any of claims 1 to 7, in which the drive wheels located on the same side of the vehicle are hydraulically connected together so as to constitute an assembly.
9. A vehicle as claimed in claim 8, including means for regulating the series feed to the hydraulic motors of each assembly independently of the feed to those of the other assembly.
10. A vehicle as claimed in claim 9, in which the hydraulic motors of the assemblies are fed by a single hydraulic pump.
11. A vehicle as claimed in claim 9, in which each hydraulic motor assembly is provided with its own hydraulic pump.
12. A vehicle as claimed in any claims 8 to 11, including a bypass ensuring a secondary connection between the series feeds to the hydraulic motors of the assemblies in order to guarantee the safety of the system in the case of overpressu re.
13. A wheeled vehicle substantially as described with reference to the accompanying drawing.
GB8020586A 1979-06-27 1980-06-24 Wheeled-vehicle with hydrostatic transmission Expired GB2058300B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE877321 1979-06-27

Publications (2)

Publication Number Publication Date
GB2058300A true GB2058300A (en) 1981-04-08
GB2058300B GB2058300B (en) 1983-02-16

Family

ID=3861781

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8020586A Expired GB2058300B (en) 1979-06-27 1980-06-24 Wheeled-vehicle with hydrostatic transmission

Country Status (10)

Country Link
BE (1) BE877321A (en)
CA (1) CA1132056A (en)
DE (1) DE3023749A1 (en)
ES (1) ES492840A0 (en)
FR (1) FR2459738B1 (en)
GB (1) GB2058300B (en)
IT (1) IT1188882B (en)
LU (1) LU82547A1 (en)
NL (1) NL8003604A (en)
PT (1) PT71397A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0210407A1 (en) * 1985-06-26 1987-02-04 Leo Stahl AG Vehicle drive
FR2664553A1 (en) * 1990-07-11 1992-01-17 Pierre Francois Guy Fitting, to a craft moved by a hydrostatic transmission, of a system for controlling steering by pivoting of the stub axles or by laterally immobilising the wheels, at the driver's will
GB2246844A (en) * 1990-07-13 1992-02-12 Glowreach Limited Vehicle with auxiliary drive system
FR2785958A1 (en) * 1998-11-18 2000-05-19 Toyoda Automatic Loom Works Hydraulic drive for Four-wheel drive industrial vehicle, has individual wheel motors series connected on each side, forming two parallel hydraulic circuits
EP1092611A1 (en) * 1999-10-13 2001-04-18 Deere & Company Hydrostatic vehicle steering system with supplemental charge pump
WO2005053989A1 (en) * 2003-12-02 2005-06-16 Brueninghaus Hydromatik Gmbh Hydrostatic drive system with pump-sided division of the amount of hydraulic fluid

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI75308C (en) * 1985-01-25 1988-06-09 Ky Carlson Project Kb HYDROSTATISKT DRIVSYSTEM.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140469B (en) * 1961-01-11 1962-11-29 Max Adolf Mueller Dipl Ing Hydrostatic single drive for heavy all-terrain vehicles, especially earthmoving machines, construction equipment and recovery vehicles
DE1780721A1 (en) * 1968-07-27 1977-04-14 Kloeckner Humboldt Deutz Ag ARRANGEMENT FOR TRANSMISSION OF POWER FROM THE DRIVE UNITS OF A MOTOR VEHICLE
FR2036637A5 (en) * 1969-03-26 1970-12-24 Schwermasch Nobas Veb
DE1922399A1 (en) * 1969-05-02 1970-11-12 Koedel & Boehm Gmbh All-terrain, especially agricultural, self-propelled vehicle with hydraulic drive

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0210407A1 (en) * 1985-06-26 1987-02-04 Leo Stahl AG Vehicle drive
FR2664553A1 (en) * 1990-07-11 1992-01-17 Pierre Francois Guy Fitting, to a craft moved by a hydrostatic transmission, of a system for controlling steering by pivoting of the stub axles or by laterally immobilising the wheels, at the driver's will
GB2246844A (en) * 1990-07-13 1992-02-12 Glowreach Limited Vehicle with auxiliary drive system
FR2785958A1 (en) * 1998-11-18 2000-05-19 Toyoda Automatic Loom Works Hydraulic drive for Four-wheel drive industrial vehicle, has individual wheel motors series connected on each side, forming two parallel hydraulic circuits
EP1092611A1 (en) * 1999-10-13 2001-04-18 Deere & Company Hydrostatic vehicle steering system with supplemental charge pump
WO2005053989A1 (en) * 2003-12-02 2005-06-16 Brueninghaus Hydromatik Gmbh Hydrostatic drive system with pump-sided division of the amount of hydraulic fluid

Also Published As

Publication number Publication date
PT71397A (en) 1980-07-01
IT8067989A0 (en) 1980-06-25
CA1132056A (en) 1982-09-21
LU82547A1 (en) 1980-10-24
ES8102018A1 (en) 1980-12-16
IT1188882B (en) 1988-01-28
GB2058300B (en) 1983-02-16
DE3023749A1 (en) 1981-01-22
ES492840A0 (en) 1980-12-16
FR2459738B1 (en) 1987-04-30
FR2459738A1 (en) 1981-01-16
NL8003604A (en) 1980-12-30
BE877321A (en) 1979-12-27

Similar Documents

Publication Publication Date Title
US7083014B2 (en) Drive device for a machine with a traction drive system and a hydraulic work system
US3334702A (en) Four wheel drive articulated vehicle with means to transfer power between the wheels
US2336911A (en) Power transmission and steering control for traction devices
US4168757A (en) Drive system for a skid steer loader
CA1224696A (en) Multi-wheel drive system
CA1040973A (en) Hydrostatic drive circuit
US9067575B2 (en) Brake system and vehicle comprising a brake system
CA1123707A (en) Auxiliary drive system with neutral
EP0769607A1 (en) Pump unit
AU2003261558B2 (en) Brake cooling system and method of cooling brakes in an axle
US5188193A (en) Drive arrangement for earth moving machines
CA1132056A (en) Wheeled vehicle
GB960163A (en) Improvements in or relating to engine-propelled vehicles
US2461116A (en) Hydraulic system for controlling the operation of rotary hydraulic motors
ES2115299T3 (en) OSCILLATION AXLE FOR A WORKING VEHICLE.
US3180080A (en) Fluid power synchronizing drive
HU224905B1 (en) Motor vehicle with hydrostatic steering system
JPS60139533A (en) Four-wheel drive vehicle
US6098738A (en) Hydraulic drive system for a vehicle
GB2173748A (en) A hydrostatic drive
US4325452A (en) Work vehicle
GB2221516A (en) Hydraulic transmission system
DE3660950D1 (en) Propulsion system for motor vehicles, especially for motor cars
GB2378931A (en) Powered auxiliary element for a motor vehicle
GB1590461A (en) Agricultural tractors

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee