CA1158275A - Tractor - Google Patents
TractorInfo
- Publication number
- CA1158275A CA1158275A CA000361885A CA361885A CA1158275A CA 1158275 A CA1158275 A CA 1158275A CA 000361885 A CA000361885 A CA 000361885A CA 361885 A CA361885 A CA 361885A CA 1158275 A CA1158275 A CA 1158275A
- Authority
- CA
- Canada
- Prior art keywords
- frame
- tractor
- axle
- booms
- hydraulic
- 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.)
- Expired
Links
Landscapes
- Agricultural Machines (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The tractor has a main frame, supported by a pair of steering/driving wheels, to which is fitted the engine and transmission.
A pair of booms are pivotally mounted on the frame (or on a sub-frame pivotally connected to the frame) and are provided with castor wheels. The track between the castor wheels is selectively adjustable by hydraulic rams connected to the booms and the frame (or sub-frame).
Agricultural implements may be connected to the frame, to the booms inside the wheelbase of the tractor or to a draw-bar interconnecting the booms.
The tractor has a main frame, supported by a pair of steering/driving wheels, to which is fitted the engine and transmission.
A pair of booms are pivotally mounted on the frame (or on a sub-frame pivotally connected to the frame) and are provided with castor wheels. The track between the castor wheels is selectively adjustable by hydraulic rams connected to the booms and the frame (or sub-frame).
Agricultural implements may be connected to the frame, to the booms inside the wheelbase of the tractor or to a draw-bar interconnecting the booms.
Description
` ~58~75 BACKGROUND OF THE INVENTION
. . . _ . . _ (1) Field of the Invention:
. . .
~HIS INVENTION relates to a tractor self-propelled implement vehicle or the like (hereinafter called "a tractor").
The invention is also directed to a power-module which can be used with such tractors or implements.
. . . _ . . _ (1) Field of the Invention:
. . .
~HIS INVENTION relates to a tractor self-propelled implement vehicle or the like (hereinafter called "a tractor").
The invention is also directed to a power-module which can be used with such tractors or implements.
(2) Descrlption of the Prior Art:
.
Ihe conventional tractor has been in use in the same general configuration for many years and in principle has been confined to one module incorporating the chassis, engine, transmission and operator's platform, the module being supported on four or more wheels, of which generally 2 or 4 are driven. The evolution of the tractor was based on horse drawn equipment through to the "iron horse" with implements, attachments and harvesters, the tractor taking over the role of the horse(s) as the means of motive power.
While no one will deny that the tractor has been a marked improvement over the horse in terms of productivity, expense, running costs and ease of use, the conventional tractor has limitations in many aspects and some of the more important are listed as follows:
ta) It has only one three-point linkage assembly at the rear.
(b) It requires a headland to turn about, the size of the headland depending on whether the implement is attached to the tllree-point linkage or to the draw bar.
~,~
i 27!~
(c) ~s the implement is generally trailed, the operator must drive looking forward to steer and rearward to control the operation of the implement.
(d) In certain applications, e.g. harvesting, separate operators are required for the tractor and implement.
(e) It is inefficient at low speeds as the engine speed, and therefore the torque and power output, is low with the possibility of the engine stalling. In addition the output speed of any drive to any implement (eOg. by the power-take-off (P.T.O.)) is not independent of the engine speed.
(f) It has not been possible to o~fer both high clearance and low clearance facilities on the one tractor.
(g) The extent of variations in the track, e.g. to suit row crops, has been limited, and the wheel-base has been fixed.
(h) It is liable to roll over either under load or when travelling on steep terrain.
(i~ The number of attachments which can be fitted in one operation is limited. ~-(i) It is not adapted for ~uick disassembly and "walk out"
from one implement for fitting to another for a second operation.
(k) It has not been convertable to an independent trans-25- porter and cannot provide the facility of a transporter e.g. during harvesting a crop.
~ 1~827~;
(l) It is not readily adaptable to the fitting of implements within its wheelbase.
(m) It is not able to provide a forward speed which is slow enough to suit specific operations, e.g. mushroom compost turning.
(n) It has not been suitable as a mobile workshop with the facility to supply drive to a number of independent pieces of machinery and equipment and is not connectable to both the mechanical and/or hydraulic drive of commercially available equipment without the requirement for auxiliary power being generated by further attach-ments on the tractor or equipment.
(o) It has not provided an alternative range and power and type of engine for a single tractor.
(p) It has not always offered a high gear ratio for road transport and a low gear ratio for field work.
(q) It has not provided the facility to tip a transporter bin inside the four wheels or to high clear with such a bin.
(r~ It has not provided the option of four wheel drive which may be fitted to a standard unit after delivery or for independent drive to the four wheels.
(s) It has not been adaptable to be packed down into a small volume module for transportation.
(t) It has not provided an all-purpose tractor powered by an all-hydrostatic power system.
27~
SUM~RY OF THE INVEN~ION
It is an object of the present invention which can overcome one or more of the above failings of conventional tractors.
It is a preferred object that a tractor of the present invention is relatively simple to manufacture and operate.
It is a further preferred object of the present invention to provide a suitable power module for the tractor.
1~ Other preferred objects of the present invention will become apparen~ from the following description.
In one aspect the present invention resides in a tractor including;
a frame;
an engine mounted on said frame;
at least one drive wheel supporting said frame;
transmission means operatively connecting said engine and said drive wheeli a-t least one boom pivotally connected to said ~O frame and extending in a direction away from said frame;
means for pivotally moving said boom towards or away from the longitudinal axis of said frame;
means on said boom to permit a farming implement to be secured thereto; and -a ground engaging wheel supporting said boom.
Preferably the frame is rectangular and the boomsare pivotally connected to the corners of the frame. Alter-natively a sub-frame may be pivotally connected to the frame and the booms pivotally connected to the sub-frame. Preferably the pivotal movement of each boom is controlled by a hydraulic ram. The transmission means may include a hydraulic pump driven by the engine and a pair of hyaraulic motors, one in the hub of 8 2 7 e~
each drive wheel. Alternatively, the transmission may include a gearbox and difLerential or other suitable drive means.
The ground engaging wheels on the booms may be castor wheels or may be steered. IE required, these wheels may also be provided with hydrostatic motors to provide Eour wheel drive ( 4WD).
To enable the track of the tractor to be varied, the booms may be swung in or out and the drive wheels may be mounted on slidably mounted axles. The axle housings may be movable to enable the clearance of the tractor to be raised or lowered.
Tool attachment means, e.g. hitches, brackets, three-point linkage or the like, may be mounted on the frame, sub~
frame and/or the booms.
BRIEF DESCRIPTION OF TIE SF.VE'RAL VIEWS OF THE DRAWING5 ~o enable the invention to be fully understood, a preferred embodiment will now be described with re~erence to the accompanying drawings, in which:
FIG. 1 is a side of the tractor, with a portion broken away for clarity; and FIG. 2 is a pian view of the tractor showing the hooms swung in (solid lines) and swung out (dashed lines).
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
_ . _ , The power module lO of the tractor has a peripheral frame ll. A petrol or diesel engine driving a hydraulic pump is 1 ~8~7~
mounted inside the engine cover 12. A fuel tank and hydraulic oil tank is also mounted on the frame (not shown). An operator's seat 13 is mounted at one side of the operator's platform 14 and the operator is provided with operating controls 15. A canopy 16, supported on posts 17, and side covers 18 are ~rovided to protect the operator on the platform 14. ~Q~
Each drive wheel 19, fitted with a pneumatic ~q~ 20, has a hydraulic motor 21 connected to its hub 22 in driving arrangement. The motors 21 are connected to the hydraulic pump via hydraulic lines 23. The supply of fluid from the pump to each motor 21 is controlled by the operator via control levers 15. Each motor 21 is mounted on one end of a stub axle 24 which is slidably mounted in a box-section axle housing 25.
Holes (not shown) are provided in each stub axle 24 and its respective axle housing 25 and bolts 26 are provided to secure the axles at a desired track setting. As shown in the FIGS.
the drive wheels 19 lie inside the frame 11 of the power module. The track can be further reduced by movi`ng the wheels 20 ~ towards each other. To increase the track, the stub axles 24 are reversed so that the wheels 19 lie outside the frame 11.
To facilitate this adjustmentj quick-disconnect couplings are provided between the motors 21 and hydraulic lines 23.
To enable the clearance of the tractor to be raised and lowered, each axle housing 25 is mounted on axle arm 26a, pivotally mounted on frame 11 via a pivot pin 26b and held in position by bolts (not shown). As shown in FIG. 1~ the tractor is in the high clearance mode.
A sub-frame 27 extends transversely of the tractor and is pivotally connected to the Erame 11 via a pivot pin 28 Limit stops (not shown) control the relative angular movement between the frame 11 and sub-frame 27.
The sub-frame 27 is terminated by a pair of L-shaped brackets 29 at each end, the brackets 29 being spaced apart and interconnected by a pivot pin 30.
A boom 31, having lateral flanges 32 at one end, is pivotally mounted on each pivot pin 30 and is pivotally movable between the positions shown in FIG. 2~ The pivotal movement of each boom 31 is controlled by a hydraulic ram 33 pivotally mounted on brackets 34, 35 on the sub-frame 27 and boom 31 respectively. The operation of the hydraulic rams 33 is controlled by the operator.
A lateral beam 36 extends inwardly from the other end of each boom 31 and is terminated by a plate 37. If required, a beam (not shown) may be provided to be connected to the plates 37 when the bo¢ms 31 are swung inwardly (full lines) - this beam can be provided, for example, with a hitch or a three-point linkage. A castor wheel 38, having a pneumatic tyre 39, is mounted on an axle 40 carried by parallel arms 41. An axle - 42 fixed on plate 43 connecting the arms 41 is journalled in a bearing 44 mounted on each lateral beam 36.
A plurality of implement attachment brackets 45 are fixed along each boom 31 and a tool mounting bar 46 is mounted on the frame 11 between the driving wheels 19.
The operationof the tractor will now be described.
The engine drives the hydraulic pump which in turn S drives the two hydraulic motors 21, and thereby drive wheels 19. By operation of the control levers 15, the operator can c~ontrol the flow of hydraulic ~ to each motor 21. To turn the tractor, e.g. left, the operator moves the control lever 15 to restrict the flow of hydraulic fluid to the left hand drive motor. The le~t hand drive wheel slows or stops and the tractor turns to the left, the axles 42 of the castor wheels 38 rotating in their respective bearings 44.
In normal operation, the booms 31 are swung inwardly as shown in solid lines in FIG~ 2. To secure an implement between the booms via attachment brackets ~5, the operator extends hydraulic rams 33 to swing the booms outwardly tas shown in dashed lines). He then reverses the tractor until the implement is straddled by the tractor. He swin~s the booms inwardly and connects the implement to the brackets 45.
For row crop work, or where additional stability is required, the operator may swing the booms outwardly to a desired track setting.
To obtain the desired track setting for the drive wheels 19, he slides the stub axles 24 in axle housings 25 until the desired setting is obtained, and locks the stub axles in posltion via bolts 26.
7 ~
Alternatively, or in addition, where a greater track setting is required, the stub axles 24 are removed from their housings 25 inserted from outside the frame (so that the drive wheels lie Gutside frame 11).
For reduced ground clearance, the axle arms 26a are pivoted about pivot pins 26b until the desired ground clearance is achieved~
In rough terrain, any twisting forces on the tractor are at least partly compensated for b~ the pivotal movement between the frame 11 and sub-frame 27. (It will be appreciated that in many applications, this pivotal movement will not be required and so the sub-frame may be deleted and the booms mounted directly onto the frame 11).
With the present arrangement, one or more implements can be mounted between the booms, on tool mounting bar 46 or on the beam (not shown) interconnecting the plates 37. ~his ensures the tractor is extremely versatile and has the major advantage that one or more implements can be mounted within the wheel base of the tractor, a factor which is difficult or almost impossible with most known tractors.
Where a hydrostatic drive arrangement as previously described is employed, the tractor can be used with the castor wheels 38 either leading or trailing, depending on which direction of travel is most advantageous.
In addition, the operator's platform can be mounted, e.g~
on an extensivle boom on the frame 11 so that the operator can be positioned over the implement or to one side (such as when picking fruit from trees)O
Various changes and modifications may be made to the arrangements described without departing from the scope of the present invention. It will be understood, for example~ that a track assembly or a pair of such assemblies may be used in substitution for the drive wheels 19 of the power module 10.
The castor wheels 38 may be replaced by steerable and driven wheels or track assemblies in a four wheel drive ~4WD) configuration. The terms "drive wheel" and "ground engaging wheel" used herein shall be taken to include "drive tracks"
and "ground engaging tracks".
'
.
Ihe conventional tractor has been in use in the same general configuration for many years and in principle has been confined to one module incorporating the chassis, engine, transmission and operator's platform, the module being supported on four or more wheels, of which generally 2 or 4 are driven. The evolution of the tractor was based on horse drawn equipment through to the "iron horse" with implements, attachments and harvesters, the tractor taking over the role of the horse(s) as the means of motive power.
While no one will deny that the tractor has been a marked improvement over the horse in terms of productivity, expense, running costs and ease of use, the conventional tractor has limitations in many aspects and some of the more important are listed as follows:
ta) It has only one three-point linkage assembly at the rear.
(b) It requires a headland to turn about, the size of the headland depending on whether the implement is attached to the tllree-point linkage or to the draw bar.
~,~
i 27!~
(c) ~s the implement is generally trailed, the operator must drive looking forward to steer and rearward to control the operation of the implement.
(d) In certain applications, e.g. harvesting, separate operators are required for the tractor and implement.
(e) It is inefficient at low speeds as the engine speed, and therefore the torque and power output, is low with the possibility of the engine stalling. In addition the output speed of any drive to any implement (eOg. by the power-take-off (P.T.O.)) is not independent of the engine speed.
(f) It has not been possible to o~fer both high clearance and low clearance facilities on the one tractor.
(g) The extent of variations in the track, e.g. to suit row crops, has been limited, and the wheel-base has been fixed.
(h) It is liable to roll over either under load or when travelling on steep terrain.
(i~ The number of attachments which can be fitted in one operation is limited. ~-(i) It is not adapted for ~uick disassembly and "walk out"
from one implement for fitting to another for a second operation.
(k) It has not been convertable to an independent trans-25- porter and cannot provide the facility of a transporter e.g. during harvesting a crop.
~ 1~827~;
(l) It is not readily adaptable to the fitting of implements within its wheelbase.
(m) It is not able to provide a forward speed which is slow enough to suit specific operations, e.g. mushroom compost turning.
(n) It has not been suitable as a mobile workshop with the facility to supply drive to a number of independent pieces of machinery and equipment and is not connectable to both the mechanical and/or hydraulic drive of commercially available equipment without the requirement for auxiliary power being generated by further attach-ments on the tractor or equipment.
(o) It has not provided an alternative range and power and type of engine for a single tractor.
(p) It has not always offered a high gear ratio for road transport and a low gear ratio for field work.
(q) It has not provided the facility to tip a transporter bin inside the four wheels or to high clear with such a bin.
(r~ It has not provided the option of four wheel drive which may be fitted to a standard unit after delivery or for independent drive to the four wheels.
(s) It has not been adaptable to be packed down into a small volume module for transportation.
(t) It has not provided an all-purpose tractor powered by an all-hydrostatic power system.
27~
SUM~RY OF THE INVEN~ION
It is an object of the present invention which can overcome one or more of the above failings of conventional tractors.
It is a preferred object that a tractor of the present invention is relatively simple to manufacture and operate.
It is a further preferred object of the present invention to provide a suitable power module for the tractor.
1~ Other preferred objects of the present invention will become apparen~ from the following description.
In one aspect the present invention resides in a tractor including;
a frame;
an engine mounted on said frame;
at least one drive wheel supporting said frame;
transmission means operatively connecting said engine and said drive wheeli a-t least one boom pivotally connected to said ~O frame and extending in a direction away from said frame;
means for pivotally moving said boom towards or away from the longitudinal axis of said frame;
means on said boom to permit a farming implement to be secured thereto; and -a ground engaging wheel supporting said boom.
Preferably the frame is rectangular and the boomsare pivotally connected to the corners of the frame. Alter-natively a sub-frame may be pivotally connected to the frame and the booms pivotally connected to the sub-frame. Preferably the pivotal movement of each boom is controlled by a hydraulic ram. The transmission means may include a hydraulic pump driven by the engine and a pair of hyaraulic motors, one in the hub of 8 2 7 e~
each drive wheel. Alternatively, the transmission may include a gearbox and difLerential or other suitable drive means.
The ground engaging wheels on the booms may be castor wheels or may be steered. IE required, these wheels may also be provided with hydrostatic motors to provide Eour wheel drive ( 4WD).
To enable the track of the tractor to be varied, the booms may be swung in or out and the drive wheels may be mounted on slidably mounted axles. The axle housings may be movable to enable the clearance of the tractor to be raised or lowered.
Tool attachment means, e.g. hitches, brackets, three-point linkage or the like, may be mounted on the frame, sub~
frame and/or the booms.
BRIEF DESCRIPTION OF TIE SF.VE'RAL VIEWS OF THE DRAWING5 ~o enable the invention to be fully understood, a preferred embodiment will now be described with re~erence to the accompanying drawings, in which:
FIG. 1 is a side of the tractor, with a portion broken away for clarity; and FIG. 2 is a pian view of the tractor showing the hooms swung in (solid lines) and swung out (dashed lines).
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
_ . _ , The power module lO of the tractor has a peripheral frame ll. A petrol or diesel engine driving a hydraulic pump is 1 ~8~7~
mounted inside the engine cover 12. A fuel tank and hydraulic oil tank is also mounted on the frame (not shown). An operator's seat 13 is mounted at one side of the operator's platform 14 and the operator is provided with operating controls 15. A canopy 16, supported on posts 17, and side covers 18 are ~rovided to protect the operator on the platform 14. ~Q~
Each drive wheel 19, fitted with a pneumatic ~q~ 20, has a hydraulic motor 21 connected to its hub 22 in driving arrangement. The motors 21 are connected to the hydraulic pump via hydraulic lines 23. The supply of fluid from the pump to each motor 21 is controlled by the operator via control levers 15. Each motor 21 is mounted on one end of a stub axle 24 which is slidably mounted in a box-section axle housing 25.
Holes (not shown) are provided in each stub axle 24 and its respective axle housing 25 and bolts 26 are provided to secure the axles at a desired track setting. As shown in the FIGS.
the drive wheels 19 lie inside the frame 11 of the power module. The track can be further reduced by movi`ng the wheels 20 ~ towards each other. To increase the track, the stub axles 24 are reversed so that the wheels 19 lie outside the frame 11.
To facilitate this adjustmentj quick-disconnect couplings are provided between the motors 21 and hydraulic lines 23.
To enable the clearance of the tractor to be raised and lowered, each axle housing 25 is mounted on axle arm 26a, pivotally mounted on frame 11 via a pivot pin 26b and held in position by bolts (not shown). As shown in FIG. 1~ the tractor is in the high clearance mode.
A sub-frame 27 extends transversely of the tractor and is pivotally connected to the Erame 11 via a pivot pin 28 Limit stops (not shown) control the relative angular movement between the frame 11 and sub-frame 27.
The sub-frame 27 is terminated by a pair of L-shaped brackets 29 at each end, the brackets 29 being spaced apart and interconnected by a pivot pin 30.
A boom 31, having lateral flanges 32 at one end, is pivotally mounted on each pivot pin 30 and is pivotally movable between the positions shown in FIG. 2~ The pivotal movement of each boom 31 is controlled by a hydraulic ram 33 pivotally mounted on brackets 34, 35 on the sub-frame 27 and boom 31 respectively. The operation of the hydraulic rams 33 is controlled by the operator.
A lateral beam 36 extends inwardly from the other end of each boom 31 and is terminated by a plate 37. If required, a beam (not shown) may be provided to be connected to the plates 37 when the bo¢ms 31 are swung inwardly (full lines) - this beam can be provided, for example, with a hitch or a three-point linkage. A castor wheel 38, having a pneumatic tyre 39, is mounted on an axle 40 carried by parallel arms 41. An axle - 42 fixed on plate 43 connecting the arms 41 is journalled in a bearing 44 mounted on each lateral beam 36.
A plurality of implement attachment brackets 45 are fixed along each boom 31 and a tool mounting bar 46 is mounted on the frame 11 between the driving wheels 19.
The operationof the tractor will now be described.
The engine drives the hydraulic pump which in turn S drives the two hydraulic motors 21, and thereby drive wheels 19. By operation of the control levers 15, the operator can c~ontrol the flow of hydraulic ~ to each motor 21. To turn the tractor, e.g. left, the operator moves the control lever 15 to restrict the flow of hydraulic fluid to the left hand drive motor. The le~t hand drive wheel slows or stops and the tractor turns to the left, the axles 42 of the castor wheels 38 rotating in their respective bearings 44.
In normal operation, the booms 31 are swung inwardly as shown in solid lines in FIG~ 2. To secure an implement between the booms via attachment brackets ~5, the operator extends hydraulic rams 33 to swing the booms outwardly tas shown in dashed lines). He then reverses the tractor until the implement is straddled by the tractor. He swin~s the booms inwardly and connects the implement to the brackets 45.
For row crop work, or where additional stability is required, the operator may swing the booms outwardly to a desired track setting.
To obtain the desired track setting for the drive wheels 19, he slides the stub axles 24 in axle housings 25 until the desired setting is obtained, and locks the stub axles in posltion via bolts 26.
7 ~
Alternatively, or in addition, where a greater track setting is required, the stub axles 24 are removed from their housings 25 inserted from outside the frame (so that the drive wheels lie Gutside frame 11).
For reduced ground clearance, the axle arms 26a are pivoted about pivot pins 26b until the desired ground clearance is achieved~
In rough terrain, any twisting forces on the tractor are at least partly compensated for b~ the pivotal movement between the frame 11 and sub-frame 27. (It will be appreciated that in many applications, this pivotal movement will not be required and so the sub-frame may be deleted and the booms mounted directly onto the frame 11).
With the present arrangement, one or more implements can be mounted between the booms, on tool mounting bar 46 or on the beam (not shown) interconnecting the plates 37. ~his ensures the tractor is extremely versatile and has the major advantage that one or more implements can be mounted within the wheel base of the tractor, a factor which is difficult or almost impossible with most known tractors.
Where a hydrostatic drive arrangement as previously described is employed, the tractor can be used with the castor wheels 38 either leading or trailing, depending on which direction of travel is most advantageous.
In addition, the operator's platform can be mounted, e.g~
on an extensivle boom on the frame 11 so that the operator can be positioned over the implement or to one side (such as when picking fruit from trees)O
Various changes and modifications may be made to the arrangements described without departing from the scope of the present invention. It will be understood, for example~ that a track assembly or a pair of such assemblies may be used in substitution for the drive wheels 19 of the power module 10.
The castor wheels 38 may be replaced by steerable and driven wheels or track assemblies in a four wheel drive ~4WD) configuration. The terms "drive wheel" and "ground engaging wheel" used herein shall be taken to include "drive tracks"
and "ground engaging tracks".
'
Claims (9)
1. A tractor including:
a frame;
an engine mounted on said frame;
at least one drive wheel supporting said frame;
transmission means operatively connecting said engine and said drive wheel;
at least one boom pivotally connected to said frame and extending in a direction away from said frame;
means for pivotally moving said boom towards or away from the longitudinal axis of said frame;
means on said boom to permit a farming implement to be secured thereto; and a ground engaging wheel supporting said boom.
a frame;
an engine mounted on said frame;
at least one drive wheel supporting said frame;
transmission means operatively connecting said engine and said drive wheel;
at least one boom pivotally connected to said frame and extending in a direction away from said frame;
means for pivotally moving said boom towards or away from the longitudinal axis of said frame;
means on said boom to permit a farming implement to be secured thereto; and a ground engaging wheel supporting said boom.
2. A tractor as claimed in claim 1 wherein said frame is substantially rectangular, and a pair of booms are pivotally connected to adjacent corners of the frame.
3. A tractor as claimed in claim 1 further including:
a sub-frame pivotally connected to said frame for relative angular movement; and a pair of booms pivotally connected to the sub-frame.
a sub-frame pivotally connected to said frame for relative angular movement; and a pair of booms pivotally connected to the sub-frame.
4. A tractor as claimed in claims 2 or 3 further including hydraulic cam means for pivotally moving said booms.
5. A tractor as claimed in claim 1 wherein said
5. A tractor as claimed in claim 1 wherein said
Claim 5 continued...
transmission means comprises:
a hydraulic motor operatively connected to said drive wheel;
a hydraulic pump driven by the engine;
means to connect said hydraulic motor and said hydraulic pump; and control means to control the flow of hydraulic fluid from said hydraulic pump to said hydraulic motor to thereby control the drive to said motor.
transmission means comprises:
a hydraulic motor operatively connected to said drive wheel;
a hydraulic pump driven by the engine;
means to connect said hydraulic motor and said hydraulic pump; and control means to control the flow of hydraulic fluid from said hydraulic pump to said hydraulic motor to thereby control the drive to said motor.
6. A tractor as claimed in claim 1 further including:
an axle housing mounted on each side of said frame;
a stub axle slidably mounted in each axle housing and movable to vary the track of the tractor, each stub axle having a drive wheel rotatably mounted thereon.
an axle housing mounted on each side of said frame;
a stub axle slidably mounted in each axle housing and movable to vary the track of the tractor, each stub axle having a drive wheel rotatably mounted thereon.
7. A tractor as claimed in claim 6 and further including an axle arm pivotally mounted on each side of said frame, each of said axle housings being mounted on a respective axle arm, pivotal movement of said axle arms raising and lowering said frame relative to the ground.
8. A tractor as claimed in claim 1 in which said ground engaging wheel is a castor wheel.
9. A tractor as claimed in claim 1 in which said ground engaging wheel is driven and steerable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000361885A CA1158275A (en) | 1980-09-29 | 1980-09-29 | Tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000361885A CA1158275A (en) | 1980-09-29 | 1980-09-29 | Tractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1158275A true CA1158275A (en) | 1983-12-06 |
Family
ID=4118099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000361885A Expired CA1158275A (en) | 1980-09-29 | 1980-09-29 | Tractor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1158275A (en) |
-
1980
- 1980-09-29 CA CA000361885A patent/CA1158275A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |