GB2154959A - Wheel drive structure for agricultural tractor - Google Patents
Wheel drive structure for agricultural tractor Download PDFInfo
- Publication number
- GB2154959A GB2154959A GB08501459A GB8501459A GB2154959A GB 2154959 A GB2154959 A GB 2154959A GB 08501459 A GB08501459 A GB 08501459A GB 8501459 A GB8501459 A GB 8501459A GB 2154959 A GB2154959 A GB 2154959A
- Authority
- GB
- United Kingdom
- Prior art keywords
- case
- agricultural tractor
- wheel drive
- case portion
- differential mechanism
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
- B60B35/12—Torque-transmitting axles
- B60B35/16—Axle housings
-
- 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
- B60K17/30—Arrangement or mounting of transmissions in vehicles the ultimate propulsive elements, e.g. ground wheels, being steerable
- B60K17/303—Arrangement or mounting of transmissions in vehicles the ultimate propulsive elements, e.g. ground wheels, being steerable with a gearwheel on the steering knuckle or kingpin axis
-
- 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
- B60K17/30—Arrangement or mounting of transmissions in vehicles the ultimate propulsive elements, e.g. ground wheels, being steerable
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
- Motor Power Transmission Devices (AREA)
- Retarders (AREA)
Abstract
A wheel drive structure for an agricultural tractor comprises a drive case (6) housing a differential mechanism (13) and reduction mechanisms (19) to transmit power from said differential mechanism (13) to wheels. The drive case (6) comprises first and second case portions (12) and (11) and said first case portion is made of a structural steel pipe. <IMAGE>
Description
SPECIFICATION
Wheel drive structure for agricultural tractor
This invention relates to a wheel drive structure for an agricultural tractor comprising a drive case supporting a right and left pair of wheels, the drive case housing a differential mechanism in an intermediate position between a righthand end and a lefthand end thereof and reduction mechanisms in the righthand end and the lefthand end, repectively, to transmit power from the differential mechanism to the wheels.
With the above tractor, the smaller the outside diameter of a portion of the drive case housing the differential mechanism and a pair of transmission shafts operatively connecting the differential mechanism to the two reduction mechanisms, respectively, the higher is that portion of the drive case from the ground and the less likely is the drive case to come into contact with ridges or crop when the tractor engages in work while straddling the ridges in a field.Furthermore, since the differential mechanism has a larger outside diameter than the transmission shafts extending from the differential mechanism to the reduction mechanisms, it has been conventional that the portion of the drive case housing the differntial mechanism and the transmission shafts comprises a combination of individual parts, namely a part for housing the differntial mechanism and two other parts having a smaller diameter than the mentioned part and housing the transmission shafts, respectively.
Therefore, that portion of the drive case, and hence the entire drive case, is expensive to manufacture.
A primary object of the invention is to provide a drive case whose portion housing the differential mechanism and transmission shafts has a maximum height above the ground and which may be manufactured at low cost.
To achieve the above object a wheel drive structure for an agricultural tractor according to this invention comprises a drive case supporting a right and left pair of wheels, the drive case housing a differential mechanism in an intermediate position between a righthand end and a lefthand end thereof and reduction mechanisms in the righthand end and the lefthand end, respectively, to transmit power from the differential mechanism to the wheels, wherein the drive case comprises a first case portion housing the differential mechanism and a pair of transmission shafts operatively connecting the differential mechanism to the reduction mechanisms, respectively, and a pair of second case portions housing the reduction mechanisms, respectively, the first case portion being a length of structural steel pipe extending between the second case portions.
As described above, the first case portion comprises one continuous unit extending from one of the second case portions to the other, with a small diameter gear provided to mesh with a pinion gear. The first case portion now has a maximum height above the ground away from ridges and crops-and permits the tractor to operate desirably. Moreover, the first case portion may be manufactured at low cost utilizing an existing structural steel pipe; the manufacture involves minor shaping work only such as perforating it to receive the pinion gear and constricting certain of its parts. This results in low cost of the drive case taken as a whole.
A secondary object of this invention is to fully compensate for inability to provide a great reduction ratio resulting from the differential mechanism being housed in the steel pipe having a substantially equal diameter, as described above.
In order to achieve the secondary object, the invention provides, in addition to the foregoing construction, reduction mechanisms each having a greater reduction ratio than an average reduction ratio provided for the right and left wheels by the differential mechanism.
Even though torque input to the differential mechanism is insufficiently reduced by the small diameter gear in mesh with the input pinion gear, the small diameter gear being provided to decrese the outside diameter of the differential mechanism, it is compensated for by the reduction mechanisms each having a greater reduction ratio than an average reduction ratio provided for the right and left wheels by the differential mechanism. In order that the wheels receive a predetermined value of torque transmission, the rotary power transmitted to the differential mechanism is reduced to predetermined slow rotations for transmission to the wheels. Thus, this arrangement has the advantage of effecting sufficient reduction while permitting the first case portion to be formed of an inexpensive, continuous steel pipe extending from one of the second case portions to the other.
The invention will now be further described, by way of example, with reference to the accompanying drawings which show embodiments of a wheel drive structure for an agricultural tractor according to this invention, and in which:
Fig. 1 is a side elevation of an agricultural tractor,
Fig. 2 is a partly developed and partly broken away rear view of a front wheel mounting structure,
Fig. 3 is a partly developed front view of the front wheel mounting structure showing a modification, and
Fig. 4 is a sectional view taken on line IV-IV of Fig. 3.
Referring to Fig. 1, an agricultural tractor comprises a four wheel drive vehicle having a right and left pair of dirigible front wheels 1 and a right and left pair of nondirigible rear wheels 2. The tractor includes a lift arm 3 at the rear end thereof for vertically movably attaching a rotary plow or other working implements, and a power takeoff shaft 4 again at the rear end thereof for driving the attached working implement.
Referring to Fig. 2, the tractor further includes a drive case 6 bearing the front wheels 1 at right and left ends thereof by means of axles 5. The drive case 6 includes a pair of front and rear tubular supports 7 and 8 welded to an intermediate position between the right and left ends thereof. By means of these supports 7 and 8 and a pair of front and rear bosses 9 and 10 provided on a tractor body the drive case 6 is vertically oscillatable about an axis P1 extending longitudinally of the tractor body. Thus, the front wheels 1 are attached to the tractor body to be vertically oscillatable in opposed relationship with each other about the axis PI, whereby the tractor body maintains a substantially horizontal posture regardless of an incline of the ground transversely of the tractor.
A front wheel drive structure will be described hereinafter. The drive case 6 comprises a first case portion 1 2 formed of a length of structural steel pipe and two second, cast case portions 11, the first case portion 1 2 constituting an intermediate portion and the second case portions 11 constituting the right and left ends of the drive case 6, respectively. The first case portion 1 2 houses a differential mechanism 1 3 at an intermediate position thereof and a right and left pair of transversely extending transmission shafts 14 operatively connected to a right and left pair of side gears or output gears 1 3a of the differential mechanism 1 3, respectively.Each of the second case portions 11 houses a vertically extending transmission shaft 1 6 operatively connected to one of the transverse transmission shafts 14 through a bevel gear mechanism 1 5 acting as reduction means, and a bevel gear reduction mechanism 1 9 comprising a small drive gear 1 7 formed integral with a lower end of the vertical transmission shaft 1 6 and a large driven gear 1 8 in mesh with the small gear 1 7 and splined to the axle 5.The bevel gear reduction mechanism 1 9 has a greater reduction ratio than an average reduction ratio provided for the right and left front wheels 1 by the differential mechanism 1 3. The differential mechanism 1 3 receives an output torque of a transmission 20 through an input shaft i3b, reduces its speed and divides the output to right and left. The divided output is transmitted to each axle 5 after being reduced by the bevel gear mechanisms 1 5 and 1 9.
Number 1 3e in Fig. 2 denotes a drive pinion gear, and number 1 3d denotes a pair of pinion gears.
As shown in Fig. 2, the first case portion 1 2 contains two position setting tubes 1 2 to retain bearings 13' of the differential mechanism 1 3 in position axially of the transverse transmission shafts 14. These tubes 12' are removably inserted into the first case portion 1 2 and retain the bearings 13' in position by abutting against the bearings 13' and against case portions 21 to be described hereinbelow.
A construction to render the front wheels 1 dirigible will be described next. Each of the second case portions 11 comprises a stationary case portion 21 housing the vertical transmission shaft 1 6 and fixed to a flange 1 2a of the first case portion 12, and an oscillatable case portion 22 having the axle 5 and connected to the stationary case portion 21 to be oscillatable about a vertical axis P2 coaxial with the vertical transmission shaft 1 6.
The oscillatable case portion 22 is oscillatable by means of a knuckle arm 23.
The first case portion 1 2 defines a bore 24, as seen in Fig. 2, to permit lubricating oil in the first case portion 1 2 to flow into the boss 9 as lubricant between the boss 9 and the tubular support 7.
The bevel gear reduction mechanism 1 9 may be replaced by a planetary reduction mechanism, and they are generally called reduction mechanism in this specification.
Figs. 3 and 4 show a modified embodiment in which only one position setting tube 12' is provided on one side of the differential mechanism 1 3. This embodiment will particularly be described hereinafter using like reference numbers for like components in the preceding embodiment.
Referring to Fig. 3, a drive case 6 is provided bearing the front wheels 1 at right and left ends thereof by means of axles 5. The drive case 6 includes a tubular support 7 and an input shaft case 8 welded to an intermediate position between right and left ends thereof. The drive case 6 is attached through the tubular support 7 and the input shaft case 8 to a pair of front and rear bosses 9 and 10 provided on a tractor body, to be vertically oscillatable about an axis P1 extending longitudinally of the tractor body. Thus, the front wheels 1 are attached to the tractor body to be vertically oscillatable in opposed relationship with each other about the axis P1, whereby the tractor body maintains a substantially horizontal posture regardless of an incline of the ground transversely of the tractor.
A front wheel drive structure will be described hereinafter. The drive case 6 comprises a first case portion 1 2 formed of a length of structural steel pipe and two second, cast case portions 11, the first case portion 1 2 constituting an intermediate portion and the second case portions 11 constituting the right and left ends of the drive case 6, respectively. The first case portion 1 2 houses a differential mechanism 1 3 and a right and left pair of transversely extending transmission shafts 14 operatively connected to a right and left pair of side gears of the differential mechanism 13, respectively.Each of the second case portions 11 houses a vertically extending transmission shaft 1 6 operatively connected to one of the transverse transmission shafts 14 through a bevel gear mechanism 1 5 acting as reduction means, and a bevel gear reduction mechanism 1 9 comprising a small drive gear 1 7 formed integral with a lower end of the vertical transmission shaft 1 6 and a large driven gear 1 8 in mesh with the small gear 1 7 splined to the axle 5. The differential mechanism 1 3 receives an output torque of a transmission 20 through an input shaft 13b, reduces its speed and divides the output to right and left.The divided output is transmitted to each axle 5 after being reduced by the bevel gear mechanism 1 5 and 1 9.
A construction to render the front wheels 1 dirigible will be described next. Each of the second case portion 11 comprises a stationary case portion 21 housing the vertical transmission shaft 1 6 and fixed to a flange 1 2a of the first case portion 12, and an oscillatable case portion 22 having the axle 5 and connected to the stationary case portion 21 to be oscillatable about a vertical axis P2 coaxial with the vertical transmission shaft 16. The oscillatable case portion 22 is oscillated by means of a knuckle arm 23.
The differential mechanism 1 3 comprises a drive pinion gear 13e, a driving gear 13c, and a differential poriton 28. The differential portion 28 includes a differential gear case 26 fixed to the driving gear 1 3c by four bolts 25 extending through a space between bearings 13' of the differential gear case 26 through a support pin 27, and the pair of side gears 1 3a attached to the differential gear case 26 and the driving gear 13c, respectively. As seen in Fig. 3, the differetial portion 28 and the drive pinion gear 1 3e are opposed to each other transversely of the tractor across the driving gear 13c. Further, the driving gear 1 3c and the differential gear case 26 have similar outside diameters to render the differential mechanism 1 3 compact.
Reference number 12' denotes a position setting tube abutting at one end thereof against one of the bearings 13' of the diferential mechanism 1 3 and at the other end against the flange 12a, the other bearing 13' being held in position by a snap ring fitted to the first case portion 12, whereby the differential mechanism 1 3 is fixed in position in the first case portion 1 2. This construction involving only one position setting tube has the advantage of low manufacturing cost over the preceding embodiment in which two position setting tubes are used.
Claims (6)
1. A wheel drive structure for an agricultural tractor comprising a drive case supporting a right and left pair of wheels, said drive case housing a differential mechanism in an intermediate position between a righthand end and a lefthand end thereof and reduction mechanism in said righthand end and said lefthand end, respectively, to transmit power from said differential mechanism to said wheels, wherein said drive case comprises a first case portion housing said differential mechanism and a pair of transmission shafts operatively connecting said differential mechansism to said reduction mechanism, respectively, and a pair of second case portions housing said reductionmechanisms, respectively, said first case portion being a length of structural steel pipe extending between said second case portions.
2. A wheel drive structure for an agricultural tractor as claimed in claim 1, wherein each of said reduction mechanisms has a greater reduction ratio than an average reduction ratio provided for said right and left wheels by said differential mechanism.
3. A wheel drive structure for an agricultural tractor as claimed in claim 1 or 2, wherein each of said second case portions comprises a stationary case portion fixed to said first case portion and housing a vertical transmission shaft operatively connecting one of said transmission shafts to an axle, and an oscillatable case portion including said axle and connected to said-stationary case portion to be oscillatable about a vertical axis.
4. A wheel drive structure for an agricultural tractor as claimed in claim 3, wherein each of said reduction mechanisms comprises a bevel gear interlocking mechanism including a drive gear attached to said vertical transmission shaft operatively connected to said transmission shaft by bevel gears, and a driven gear in mesh with said drive gear and attached to said axle.
5. A wheel drive structure for an agricultural tractor substantially as hereinbefore described with reference to the accompanying drawings.
6. An agricultural tractor incorporating a wheel drive structure as claimed in any of the preceding claims.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59009145A JPS60154916A (en) | 1984-01-21 | 1984-01-21 | Structure of power transmission part for wheels in farm tractor |
| JP59037048A JPS60179329A (en) | 1984-02-27 | 1984-02-27 | Differential gear apparatus for wheel |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8501459D0 GB8501459D0 (en) | 1985-02-20 |
| GB2154959A true GB2154959A (en) | 1985-09-18 |
| GB2154959B GB2154959B (en) | 1988-01-27 |
Family
ID=26343807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08501459A Expired GB2154959B (en) | 1984-01-21 | 1985-01-21 | Wheel drive structure for agricultural tractor |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR910000882B1 (en) |
| CA (1) | CA1223215A (en) |
| DE (1) | DE3501798A1 (en) |
| FR (1) | FR2558419B1 (en) |
| GB (1) | GB2154959B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6056081A (en) * | 1997-10-16 | 2000-05-02 | Case Corporation | Mechanical front wheel drive axle for improved steering |
| US6814176B2 (en) | 2001-09-07 | 2004-11-09 | Bayerische Motoren Werke Aktiengesellschaft | Differential case for motor vehicles |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2692525B1 (en) * | 1992-06-19 | 1994-10-07 | Henry Dangel | Rigid bridge for all terrain vehicle. |
| DE102010012515B4 (en) * | 2010-03-24 | 2019-08-29 | Audi Ag | Car with a drive unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB283653A (en) * | 1926-10-15 | 1928-01-16 | Edward Steptoe Evans | Improvements in motor vehicles |
| GB1434289A (en) * | 1972-09-28 | 1976-05-05 | Eaton Axles Ltd | Axle assembly for a motor vehicle |
| GB2044698A (en) * | 1979-03-23 | 1980-10-22 | Kubota Ltd | Front wheel drive axles |
| GB2126545A (en) * | 1982-08-31 | 1984-03-28 | Lely Nv C Van Der | A tractor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US876070A (en) * | 1906-07-23 | 1908-01-07 | William H Donner | Automobile. |
| JPS589011B2 (en) * | 1974-08-13 | 1983-02-18 | 株式会社クボタ | Front wheel drive equipment for tractors, etc. |
| JPS5835406U (en) * | 1981-09-02 | 1983-03-08 | 株式会社クボタ | tractor axle case |
-
1985
- 1985-01-19 KR KR1019850000312A patent/KR910000882B1/en not_active IP Right Cessation
- 1985-01-21 DE DE19853501798 patent/DE3501798A1/en active Granted
- 1985-01-21 FR FR19858500800A patent/FR2558419B1/en not_active Expired - Lifetime
- 1985-01-21 CA CA000472509A patent/CA1223215A/en not_active Expired
- 1985-01-21 GB GB08501459A patent/GB2154959B/en not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB283653A (en) * | 1926-10-15 | 1928-01-16 | Edward Steptoe Evans | Improvements in motor vehicles |
| GB1434289A (en) * | 1972-09-28 | 1976-05-05 | Eaton Axles Ltd | Axle assembly for a motor vehicle |
| GB2044698A (en) * | 1979-03-23 | 1980-10-22 | Kubota Ltd | Front wheel drive axles |
| GB2126545A (en) * | 1982-08-31 | 1984-03-28 | Lely Nv C Van Der | A tractor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6056081A (en) * | 1997-10-16 | 2000-05-02 | Case Corporation | Mechanical front wheel drive axle for improved steering |
| US6814176B2 (en) | 2001-09-07 | 2004-11-09 | Bayerische Motoren Werke Aktiengesellschaft | Differential case for motor vehicles |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2558419A1 (en) | 1985-07-26 |
| GB2154959B (en) | 1988-01-27 |
| CA1223215A (en) | 1987-06-23 |
| KR850005345A (en) | 1985-08-24 |
| FR2558419B1 (en) | 1990-07-20 |
| KR910000882B1 (en) | 1991-02-12 |
| GB8501459D0 (en) | 1985-02-20 |
| DE3501798C2 (en) | 1989-07-27 |
| DE3501798A1 (en) | 1985-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20050120 |