GB2032586A - Hydrostatic transmission device for motor vehicles - Google Patents
Hydrostatic transmission device for motor vehicles Download PDFInfo
- Publication number
- GB2032586A GB2032586A GB7932606A GB7932606A GB2032586A GB 2032586 A GB2032586 A GB 2032586A GB 7932606 A GB7932606 A GB 7932606A GB 7932606 A GB7932606 A GB 7932606A GB 2032586 A GB2032586 A GB 2032586A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pump
- motor
- transmission device
- hydrostatic transmission
- partition
- 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.)
- Withdrawn
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 20
- 230000002706 hydrostatic effect Effects 0.000 title claims abstract description 19
- 238000005192 partition Methods 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 230000002441 reversible effect Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H39/00—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution
- F16H39/04—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit
- F16H39/06—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type
- F16H39/08—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type each with one main shaft and provided with pistons reciprocating in cylinders
- F16H39/10—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type each with one main shaft and provided with pistons reciprocating in cylinders with cylinders arranged around, and parallel or approximately parallel to the main axis of the gearing
- F16H39/14—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type each with one main shaft and provided with pistons reciprocating in cylinders with cylinders arranged around, and parallel or approximately parallel to the main axis of the gearing with cylinders carried in rotary cylinder blocks or cylinder-bearing members
-
- 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
- B60K17/28—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or type of power take-off
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Motor Power Transmission Devices (AREA)
- Control Of Fluid Gearings (AREA)
Abstract
A hydrostatic transmission device for agricultural or industrial tractors comprises a casing (1) divided into two chambers by a partition (2). One of the chambers houses a variable output hydraulic pump (4), the cylinder block (5) of which is coupled for rotation with a drive shaft (8) which passes through the partition (2) and extends through the two chambers. The drive shaft (8) is coupled at one end (12) to the vehicle engine, and at the other end (18) to a power take-off of the tractor. The other chamber houses a hydraulic motor (23) which is connected to and offset relative to the pump (4) and which drives the wheels of the tractor via a shaft (27) parallel to the drive shaft (8). <IMAGE>
Description
SPECIFICATION
Hydrostatic transmission device for motor
vehicles
The present invention relates to hydrostatic transmission devices for motor vehicles.
The invention is concerned with a hydrostatic transmission device, particularly but not
exclusively for an agricultural or industrial tractor, comprising a casing which houses a variable and
reversible output hydraulic pump, the pump being driven, in use of the device, by an internal
combustion engine of the vehicle, and supplying a variable capacity hydraulic motor adapted to drive the wheels of the vehicle, the pump and the motor being arranged in a closed circuit.
In hydrostatic transmission devices of the aforesaid type, the pump converts the power delivered by the internal combustion engine of the vehicle into hydrostatic pressure which is transmitted to the hydraulic motor, the latter reconverting the hydrostatic pressure to mechanical power which is transmitted to the axle to drive the wheels of the vehicle. The hydraulic pump and motor are arranged in a closed circuit which includes pressure regulation and safety apparatus standard in this type of transmission.
The variable and reversible output pump and the variable capacity motor provide a continuous range of forward and reverse speeds, together with a neutral position, without the need for additional mechanical equipment.
The object of the present invention is to provide an improved hydrostatic transmission device of the aforesaid type.
According to the present invention there is provided a hydrostatic transmission device of the aforesaid type characterised in that the casing comprises two portions which define respective chambers divided by a partition, one of said chambers housing the pump which is coupled for rotation with a drive shaft passing through the partition and extending through the two chambers, said drive shaft being adapted to be coupled at one end to the internal combustion engine and at the other end to a power take-off of the vehicle, and in that the other said chamber houses the hydraulic motor, the pump and motor being offset relative to each other on the partition with the drive shaft parallel to a shaft of the motor in said second chamber.
A hydrostatic transmission device according to the present invention is particularly advantageous when used with, for example, an agricultural tractor, since the drive shaft may have a crosssectional area which is sufficient to permit the transmission of all the power produced by the tractor engine to a poweptake-off of the tractor, for example through a clutch and gears. The device allows the power produced by the tractor engine to be shared between the power take-off (for agricultural implements), and the means of driving the tractor in any desired proportion.In addition the device can be operated in the two extreme conditions, namely:
(i) when all the power is transmitted to the
power take-off, for example, in the case of a stationary agricultural tractor driving agricultural implements;
(ii) when all the power is used for driving the vehicle, and the power take-off is not in use.
The offset arrangement of the pump, relative to the hydraulic motor, in a housing, which also
serves as an oil reservoir, allows the transmission device to be installed in the space usually
occupied by the gearbox of a normal tractor.
One embodiment of the invention will now be
more particularly described, by way of example,
with reference to the accompanying drawings, in which:
Figure 1 is a longitudinal section of a hydrostatic transmission device according to the present invention;
Figure 2 is a side elevational view of a partition of the housing of the device shown in Figure 1;
Figure 3 is a section taken along the line Ill-Ill of Figure 2, and
Figure 4 is a section taken along the line lV-IV of Figure 3.
Referring now to the drawings, there is shown a hydrostatic transmission device for use, for example, in an agricultural or industrial tractor, including a casing 1 formed by first and second portions 1 a, 1 b which are divided by a partition 2.
The casing portions 1 a, 1 b define respective chambers and are located and secured on the partition 2 by means of pins 3 and bolts (not shown).
The first chamber, defined by the first casing portion 1 a, housing a hydraulic pump 4 which is fixed to the partition 2 by screws 21. The pump4 has a variable stroke and a reversible output, and comprises a rotary cylinder block 5 having axial pistons 6 which interact, in a known manner, with a non-rotatable swash-plate 7. The cylinder block 5 is coupled to a drive shaft 8 which passes through the chamber, perpendicular to the partition 2.
The drive shaft 8 is rotatably mounted in sealed plummer blocks 9, 10 fixed, respectively, in the partition 2, and in a mounting 11 formed in the way of the first casing portion 1 a opposite the partition 2. One end of the drive shaft 8 extends from the first chamber and has a splined portion 1 2 which engages a cooperating coupling 1 3 on the flywheel 14 of the internal combustion engine (not shown) of the tractor. The other end of the shaft 8, extending through the partition 2 and olummer block 9, has a similar splinedportion 15 which is connected by a sleeve 16 to a splined portion 17 at one end of an extension 1 8 of the shaft 8 which passes through the second chamber, defined by the second casing portion 1 b.The shaft extension 18 is rotatably mounted in a sealed plummer block 19, by a screw 20 which is fixed to the wall of the second casing portion 1 b. The other end of the shaft extension 1 8 is connected, by a conventional clutch and gears (not shown), to a power take-off (not shown), known per se. The cross-sectional area of the shaft 8 and the extension 18 is such that the full power of the internal combustion engine can be transmitted to the power take-off.
The second chamber, defined by the second casing portion 1b, houses a variable capacity hydraulic motor 23, which is fixed to the partition 2 by screws 22. The motor 23 is simiiar to the pump 4, and comprises a rotatable cylinder block 24 having axial pistons 25 which interact, in a known manner, with a non-rotatable swash-plate 26.
The rotatable cylinder block 24 is coupled to a shaft 27 which is rotatably mounted in a sealed plummer block 28 fixed in the wall of the second casing portion 1 b opposite the partition 2. The shaft 27 extends from the casing 1 and has a splined external end portion 27a which is connected, in a known manner, to the wheels (not shown) of the tractor.
As shown in Figures 1 and 2, the hydraulic pump 4 is fixed to the upper part (as shown) of one face 29 of the partition 2, and the hydraulic motor 23 is fixed to the lower part of the other face 30 of the partition 2, such that the pump 4 is offset (vertically as viewed in Figure 1) relative to the motor 23.
The casing 1 forms an oil reservoir, the oil being drawn into the casing 1 through a filter 31 which is located in the first chamber and is fixed to the partition by screws 32. The oil filter 31 is connected to the pump 4 by a supply duct 33 formed in the partition 2.
The pump 4 and the motor 23 are connected in a closed hydraulic circuit by ducts 34, 35, which are formed in the partition 2, and interconnect the ports 36 of the pump 4 and the ports 37 of the motor 23, so that oil under pressure is pumped to the motor 23 through the duct 34, and nonpressurised oil returns to the pump 4 through the duct 35.
The angle and sense of the inclination of the pump swash-plate 7 relative to the drive shaft 8, and of the motor swash-plate 26 relative to the shaft 27, can be controlled by respective hydraulic servo mechanisms 7a, 27a through connecting rods and levers attached to each swash-plate 7, 26.
When the tractor is stationary, the piston stroke of the pump 4 is zero (zero pump capacity) the piston stroke of the motor 23 is at its maximum. In order to drive the tractor wheels, hydraulic fluid is delivered to the motor 23 from the pump 4. When the piston stroke of the pump 4 reaches its maximum value, corresponding to the maximum inclination of the pump swash plate 7, the speed of the motor 23 may be increased by reducing the
inclination of the motor swash plate 26.
The sense of inclination of the pump swash
plate 7 to the shaft 8 will determine the direction
of rotation of the motor 23, that is, forward or
reverse drive of the tractor.
Mechanical stops (not shown) are provided to
limit the permitted range of piston stroke variation
of the motor 23.
Claims (6)
1. A hydrostatic transmission device for motor vehicles, comprising a casing which houses a variable
and reversible output hydraulic pump, the pump
being driven in use of the device by an internal
combustion engine of the vehicle, and supplying a variable capacity hydraulic motor which is adapted to drive the wheels of the vehicle, the pump and the motor being arranged in a closed circuit, in
which the casing comprises two portions which define respective chambers divided by a partition,
one of said chambers housing the pump which is
coupled for rotation with a drive shaft passing through the partition and extending through the two chambers, said drive shaft being adapted to
be coupled at one end to the internal combustion engine and at the other end to a power take-off of the vehicle, and in which the other said chamber houses the hydraulic motor, the pump and motor being offset relative to each other on the partition with the drive shaft parallel to a shaft of the motor and in said second chamber.
2. A hydrostatic transmission device as claimed in Claim 1, in which the partition is formed with two ducts, one said duct supplying the motor with hydraulic fluid under pressure from the pump, and the said duct returning non-pressurised fluid to the pump.
3. A hydrostatic transmission device as claimed in Claims 1 and 2, in which the casing constitutes a reservoir for the hydraulic fluid.
4. A hydrostatic transmission device as claimed in Claim 1, in which the pump and the hydraulic motor each comprises a rotatable cylinder block mounted on a respective said shaft and having axial pistons acting upon a respective nonrotatable swash-plate.
5. A hydrostatic transmission device as claimed in Claim 4, in which the angle and sense of inclination of each swash-plate is controllable by a respective hydraulic servo mechanism connected through a linkage to each swash-plate.
6. A hydrostatic transmission device for motor vehicles as herein described with reference to, and as shown in, the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7828264A FR2438212A1 (en) | 1978-10-03 | 1978-10-03 | HYDROSTATIC TRANSMISSION DEVICE, PARTICULARLY FOR AGRICULTURAL OR INDUSTRIAL TRACTORS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2032586A true GB2032586A (en) | 1980-05-08 |
Family
ID=9213283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7932606A Withdrawn GB2032586A (en) | 1978-10-03 | 1979-09-20 | Hydrostatic transmission device for motor vehicles |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5591420A (en) |
| DE (2) | DE2938052A1 (en) |
| FR (1) | FR2438212A1 (en) |
| GB (1) | GB2032586A (en) |
| IT (1) | IT1196652B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2164130A (en) * | 1984-07-10 | 1986-03-12 | Kubota Ltd | Tractor with hydraulic stepless change speed mechanism |
| US4856368A (en) * | 1987-06-26 | 1989-08-15 | Kanzaki Kokyukoki Mfg. Co. Ltd. | HST (hydrostatic transmission) containing axle drive apparatus |
| US4922787A (en) * | 1987-06-26 | 1990-05-08 | Kanzaki Kokyukoki Mfg. Co. Ltd. | HST (hydrostatic transmission) housing axle driving apparatus |
| US5040649A (en) * | 1988-06-03 | 1991-08-20 | Kanzaki Kokyukoki Mfg. Co., Ltd. | HST type axle driving apparatus with brake and transmission interlock |
| EP0945397A3 (en) * | 1998-03-27 | 2002-04-17 | MERLO S.P.A. Industria Metalmeccanica | A vehicle with a lifting boom, having a power takeoff driven by a mechanical transmission |
| EP0945396A3 (en) * | 1998-03-27 | 2002-04-17 | MERLO S.P.A. Industria Metalmeccanica | A vehicle with a lifting boom, having an engine inclined with respect to the longitudinal axis of the vehicle |
| US6637294B2 (en) | 2000-09-18 | 2003-10-28 | Kanzaki Kokyukoki Mfg. Co., Ltd | Transmission for vehicle |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3231435A1 (en) * | 1982-08-20 | 1984-02-23 | Mannesmann AG, 4000 Düsseldorf | Take-off shaft drive |
| DE3245518A1 (en) * | 1982-12-09 | 1984-06-14 | Gebrüder Holder GmbH & Co, 7430 Metzingen | Drive arrangement for motor vehicles, in particular for a tractor |
| JP3824665B2 (en) * | 1994-07-25 | 2006-09-20 | 株式会社 神崎高級工機製作所 | Work vehicle transmission |
| JP2003118404A (en) * | 2001-10-12 | 2003-04-23 | Kanzaki Kokyukoki Mfg Co Ltd | Transmission for working vehicle |
| EP1302355B1 (en) | 2001-10-12 | 2007-06-13 | Kanzaki Kokyukoki MFG. Co., Ltd. | Transmission for a working vehicle and vehicle |
| DE10214598B4 (en) * | 2002-04-03 | 2009-05-07 | Cnh Belgium N.V. | Travel drive for an agricultural harvester with control of the driving speed when driving on the road |
| JP4761301B2 (en) * | 2004-09-01 | 2011-08-31 | 株式会社 神崎高級工機製作所 | Work vehicle equipped with hydraulic transmission |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3122025A (en) * | 1961-03-29 | 1964-02-25 | Massey Ferguson Inc | Tractor transmission |
| US3170297A (en) * | 1963-09-30 | 1965-02-23 | Bendix Corp | Hydrostatic thrust bearing device |
| DE1480553A1 (en) * | 1963-12-10 | 1969-06-12 | Helmut Wittmeyer | Hydrostatic transmission for motor vehicles |
| DE2332621A1 (en) * | 1973-06-27 | 1975-01-16 | Kopat Ges Fuer Konstruktion En | Hydrostatic torque converter for small vehicles - uses axial piston variable output pump driving constant inward flow motor |
-
1978
- 1978-10-03 FR FR7828264A patent/FR2438212A1/en not_active Withdrawn
-
1979
- 1979-07-24 IT IT68532/79A patent/IT1196652B/en active
- 1979-09-20 GB GB7932606A patent/GB2032586A/en not_active Withdrawn
- 1979-09-20 DE DE19792938052 patent/DE2938052A1/en not_active Ceased
- 1979-09-20 DE DE19797926696U patent/DE7926696U1/en not_active Expired
- 1979-10-02 JP JP12721979A patent/JPS5591420A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2164130A (en) * | 1984-07-10 | 1986-03-12 | Kubota Ltd | Tractor with hydraulic stepless change speed mechanism |
| US4856368A (en) * | 1987-06-26 | 1989-08-15 | Kanzaki Kokyukoki Mfg. Co. Ltd. | HST (hydrostatic transmission) containing axle drive apparatus |
| US4922787A (en) * | 1987-06-26 | 1990-05-08 | Kanzaki Kokyukoki Mfg. Co. Ltd. | HST (hydrostatic transmission) housing axle driving apparatus |
| US4942780A (en) * | 1987-06-26 | 1990-07-24 | Kanzaki Kokyukoki Mfg., Co., Ltd. | HST(hydrostatic transmission) housing axle driving apparatus |
| US5040649A (en) * | 1988-06-03 | 1991-08-20 | Kanzaki Kokyukoki Mfg. Co., Ltd. | HST type axle driving apparatus with brake and transmission interlock |
| EP0945397A3 (en) * | 1998-03-27 | 2002-04-17 | MERLO S.P.A. Industria Metalmeccanica | A vehicle with a lifting boom, having a power takeoff driven by a mechanical transmission |
| EP0945396A3 (en) * | 1998-03-27 | 2002-04-17 | MERLO S.P.A. Industria Metalmeccanica | A vehicle with a lifting boom, having an engine inclined with respect to the longitudinal axis of the vehicle |
| US6637294B2 (en) | 2000-09-18 | 2003-10-28 | Kanzaki Kokyukoki Mfg. Co., Ltd | Transmission for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2938052A1 (en) | 1980-04-10 |
| IT1196652B (en) | 1988-11-25 |
| IT7968532A0 (en) | 1979-07-24 |
| JPS5591420A (en) | 1980-07-11 |
| FR2438212A1 (en) | 1980-04-30 |
| DE7926696U1 (en) | 1981-12-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |