CA1231062A - Wheel drive apparatus for an agricultural tractor - Google Patents
Wheel drive apparatus for an agricultural tractorInfo
- Publication number
- CA1231062A CA1231062A CA000472522A CA472522A CA1231062A CA 1231062 A CA1231062 A CA 1231062A CA 000472522 A CA000472522 A CA 000472522A CA 472522 A CA472522 A CA 472522A CA 1231062 A CA1231062 A CA 1231062A
- Authority
- CA
- Canada
- Prior art keywords
- bevel gear
- shaft portion
- welded
- transmission shaft
- portions
- 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
Classifications
-
- 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
-
- 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
- B60K17/22—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or type of main drive shafting, e.g. cardan shaft
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Retarders (AREA)
- Gear Transmission (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
- Motor Power Transmission Devices (AREA)
- General Details Of Gearings (AREA)
Abstract
Abstract of the Disclosure A wheel drive apparatus for an agricultural tractor wherein a vertical transmission shaft (16) is interposed between a differential mechanism (13) and a axle (5).
The transmission shaft (16) comprises a lower shaft portion (16a) having a bevel gear (17) and an upper shaft portion (16b) located above the lower shaft portion (16a). These portions (16a) and (16b) are welded to each other at a portion located adjacent an upper portion of the bevel gear (17).
The transmission shaft (16) comprises a lower shaft portion (16a) having a bevel gear (17) and an upper shaft portion (16b) located above the lower shaft portion (16a). These portions (16a) and (16b) are welded to each other at a portion located adjacent an upper portion of the bevel gear (17).
Description
I
A Wheel Drive Apparatus for an Agricultural Tractor Background of the Invention This invention relates to a wheel drive apparatus for an agricultural tractor which comprises a vertical trays-mission shaft provided between a differential mechanism and wheel axles respectively and a drive bevel gear in mesh with a reduction driven gear operatively connected to the wheel axles respectively and integrally formed with a lower end of the transmission shaft respectively, said bevel gears being tapered to the upper portion thereof.
It is considered that the above agricultural tractor increases the height of a differential mechanism case from the ground by providing a vertical transmission shaft bet-wren a wheel axle and the differential mechanism respectively so that operation or working may be carried out while evading contact between ridges or crop and the differential mechanism case to the utmost even if the ridges locate between the right and left wheels.
However, in the prior art, the drive bevel gear is formed in integral with whole the transmission shaft and as the result, the height of the differential mechanism from the ground does not become sufficiently high! Because, the following is the reasons: In the case of the bevel gear such constructed, when cutting the teeth of the bevel gear, it necessitates notate contact a cutting tool, which ISSUES
is moved in the longitudinal direction of the teeth, with the transmission shaft. The transmission shaft per so cannot be one having small diameter since it has to provide a predetermined strength for transmission of power.
When the diameter of the reduction driven gear is made small in order to make sufficiently great reduction ratio between the drive bevel gear and the reduction driven gear, the construction for reduction becomes large and projects greatly over the wheels, so that it becomes easy to contact the crop or ridges. Therefore, the reduction driven gear cannot be made with large diameter and the reduction ratio between the drive bevel gear and the reduction driven gear can be small and as the result it necessitates to increase an average ratio of reduction of the differential mechanism to the right and left wheels so as to reduce rotation power for the differential mechanism into a predetermined low rotation and then transmit same to the right and left wheels.
Because, it is necessary to enlarge the diameter of the reduction driven gear which engages with an input pinion gear of the differential mechanism in spite of small reduce lion ratio.
Summary of the Invention An object of this invention is to compactly construct a reduction mechanism which comprises a drive bevel gear and a reduction driven gear and further to obtain the ~LZ3~
sufficient height of a differential mechanism from the ground without raising the center of gravity of a tractor body.
In order to achieve the above-mentioned object, a wheel drive apparatus for an agricultural tractor according to this invention comprises an axle, a reduction driven gear operatively connected to the axle, a differential mechanism, a vertical transmission shaft interposed between the axle and the differential mechanism, a bevel gear formed integral with a lower end of the vertical transmission shaft and tapered to the upper portion thereof, said bevel gear being engaged with the reduction driven gear wherein the vertical transmission shaft comprises a lower shaft portion having the bevel gear and an upper shaft portion located there above and these portions are welded to each other at a portion thereof located adjacent an upper portion of the bevel gear.
Namely, the lower shaft portion of the transmission shaft having the drive bevel gear and the upper shaft portion are manufactured independently to each other and finishing process is given to the drive bevel gear and thereafter both of the upper and lower shaft portions of the transmission shaft are welded to a single one.'' Therefore, even if the bevel gear is made with the irreducible minimum diameter of a demand, there occurs an inconvenience of contacting a cut-tying tool with the transmission shaft when cutting the teeth ~.23~ 62 of the drive gavel gear.
Accordingly, the input rotation power to the different trial mechanism can be reduced to a predetermined low rota-lion and transmitted to the right and left wheels without increasing a reduction ratio in the reduction construction or mechanism between the reduction driven gear and the vertical transmission shaft by enlarging the diameter of the driven gear or increasing the reduction ratio of -the differential mechanism by enlarging the diameter of a gear in mesh with the input pinion gear to the differential mechanism. Thus, it becomes possible to make the differ-entail mechanism compact while minimizing a reduction mocha-noisome which comprises the drive bevel gear and the reduction driven gear and as the result, it enables to raise the height of the differential mechanism case sufficiently from the ground without raising the center of gravity of the tractor body as in the case of extension of a vertical trays-mission shaft, so that even if ridges are located between the right and left wheels, it may be possible to carry out operation or working favorably while satisfactorily evading contact between the ridges or crop and the differential mechanism or other transmission mechanisms and then traveling safely by positioning the center of gravity of the tractor body low.
Other objects and advantages will be apparent from the ~IL23~L(.b~f~
following description with reference to the drawings.
Brief Description of the Drawings The drawings show an embodiment of a wheel drive Papa-fetus for an agricultural tractor according to this invent lion in which:-Fig. 1 is a side view of the agricultural tractor, Fig. 2 is a rear view of mounting portions of frontals partly broken away and partly developed, Fig. 3 is a front view of a vertical transmission shaft, and Fig. 4 is an enlarged side view of a lower end portion of the vertical transmission shaft having a spiral bevel gear.
Description of the Preferred Embodiment 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 non-dirigible 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 at the rear end thereof for driving the attached working implement. I
As shown in 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 ~23~l(.b6'~
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 Pi 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 herein-after. The drive case 6 comprises a case portion 12 formed of a length of structural steel pipe and two cast case port lions 11, the case portion 11 constituting an intermediate portion and the case portions 11 constituting the right and left ends of the drive case 6, respectively. The case portion 12 houses a differential mechanism 13 at an inter-mediate position thereof and a right and left pair of trays- , tersely extending transmission shafts 14 operatively connected to a right and left pair of output gears aye and 13b of the differential mechanism 13, respectively. Each of the case portions 11 houses a vertically extending trays-mission shaft 16 operatively connected to one of the trays-verse transmission shafts 14 through a bevel gear mechanism ~Z3~ ii2 15 acting as reduction means, and a bevel gear reduction mechanism 19 comprising a spiral bevel gear lo formed integral with a lower end of the vertical transmission shaft 16 and tapered to the upper portion thereof and a reduction driven gear 18 in mesh with the spiral bevel gear 17 and splinted to the axle 5. The bevel gear reduce -lion mechanism 19 has a greater reduction ratio than an verge reduction ratio provided for the right and left front wheels 1 by the differential mechanism 13. The differential mechanism 13 receives an output torque of a transmission 20 through an input shaft 13c, reduces its speed and divides the output to right and left. The divided output is trays-milted to each axle 5 after being reduced by the bevel gear mechanism 15 and 19.
A construction to render the front wheels 1 dirigible will be described next. Each of the case portions 11 comprises a stationary case portion 21 housing the vertical transmission shaft 16 and fixed to a flange aye of the 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 Pi coaxial with the vertical transmission shaft 16. The oscillatable case portion 22 is oscillatable by means of a knuckle arm 23.
Bores aye and 24b, as seen in Fig. 2, are openings for lubricating oil.
~Z3~.b6Z
As shown in Fig. 3, the vertical transmission shaft 16 comprises a lower shaft portion aye having the spiral bevel gear 17 and an upper shaft portion 16b located there above and these portions aye and 16b are welded by friction welding to each other at a portion 25 located adjacent an upper portion of the spiral bevel gear 17.
Namely, the vertical transmission shaft 16 is divided into the lower shaft portion aye and the upper shaft portion 16b at the portion 25 which is not contacted with a cutting tool moving in the longitudinal direction of the teeth of the spiral bevel gear 17; in other words the portion 25 being located on the side of the spiral bevel gear 17 to a cross point of an elongated line 26 of the bottoms of the teeth of the spiral bevel gear 17 and an outer periphery of -the vertical transmission shaft 16, and thus manufactured independently and then finishing process is given to the spiral bevel gear 17. Thereafter, these portions aye and ; 16b are welded to each other into a single shaft.
Weld of the lower shaft portion aye and the upper port lion 16b may be practiced by arc welding, gas welding or resistance welding. Further, the reduction driven gear 18 may be operatively connected to the axle 5 via a reduction mechanism such as a planetary gear.
The above-mentioned embodiment utilizing the spiral bevel gear 17 provides the following advantages.
~Z3~ Z
g Namely, since -the spiral bevel gear is adopted as a transmission gear, the characteristic of a spiral bevel gear which may transmit a high torque by engagement of -a number of teeth thereof greater than those of a normal bevel gear. As a predetermined torque can be transmitted even if the diameter of the bevel gear is made small, rotation to the differential mechanism can be reduced to a predetermined low rotation and transmitted to the wheels without increasing a reduction ratio of a reduction mocha-noisome between the reduction driven gear and the vertical transmission shaft by enlarging the diameter of the reduce lion driven gear or without increasing a reduction ratio of the differential mechanism by enlarging the diameter of a gear in mesh with the input pinion gear of the differential mechanism. Therefore, the differential mechanism can be compact while compacting the reduction mechanism comprising the drive gear and the reduction driven gear, so that the height of the differential mechanism case from the ground may be increased without raising the center of gravity of the tractor body as in the case of making a vertical trays-mission shaft long. As the result, even if ridges are located between the right and left wheels, it may be possible to carry out operation or working favorably while satisfact-rile evading contact between the ridges or crop and the differential mechanism case or other transmission mechanisms ~.Z3~(~6~
and -then traveling safely by positioning the center of gravity of the tractor body low.
A Wheel Drive Apparatus for an Agricultural Tractor Background of the Invention This invention relates to a wheel drive apparatus for an agricultural tractor which comprises a vertical trays-mission shaft provided between a differential mechanism and wheel axles respectively and a drive bevel gear in mesh with a reduction driven gear operatively connected to the wheel axles respectively and integrally formed with a lower end of the transmission shaft respectively, said bevel gears being tapered to the upper portion thereof.
It is considered that the above agricultural tractor increases the height of a differential mechanism case from the ground by providing a vertical transmission shaft bet-wren a wheel axle and the differential mechanism respectively so that operation or working may be carried out while evading contact between ridges or crop and the differential mechanism case to the utmost even if the ridges locate between the right and left wheels.
However, in the prior art, the drive bevel gear is formed in integral with whole the transmission shaft and as the result, the height of the differential mechanism from the ground does not become sufficiently high! Because, the following is the reasons: In the case of the bevel gear such constructed, when cutting the teeth of the bevel gear, it necessitates notate contact a cutting tool, which ISSUES
is moved in the longitudinal direction of the teeth, with the transmission shaft. The transmission shaft per so cannot be one having small diameter since it has to provide a predetermined strength for transmission of power.
When the diameter of the reduction driven gear is made small in order to make sufficiently great reduction ratio between the drive bevel gear and the reduction driven gear, the construction for reduction becomes large and projects greatly over the wheels, so that it becomes easy to contact the crop or ridges. Therefore, the reduction driven gear cannot be made with large diameter and the reduction ratio between the drive bevel gear and the reduction driven gear can be small and as the result it necessitates to increase an average ratio of reduction of the differential mechanism to the right and left wheels so as to reduce rotation power for the differential mechanism into a predetermined low rotation and then transmit same to the right and left wheels.
Because, it is necessary to enlarge the diameter of the reduction driven gear which engages with an input pinion gear of the differential mechanism in spite of small reduce lion ratio.
Summary of the Invention An object of this invention is to compactly construct a reduction mechanism which comprises a drive bevel gear and a reduction driven gear and further to obtain the ~LZ3~
sufficient height of a differential mechanism from the ground without raising the center of gravity of a tractor body.
In order to achieve the above-mentioned object, a wheel drive apparatus for an agricultural tractor according to this invention comprises an axle, a reduction driven gear operatively connected to the axle, a differential mechanism, a vertical transmission shaft interposed between the axle and the differential mechanism, a bevel gear formed integral with a lower end of the vertical transmission shaft and tapered to the upper portion thereof, said bevel gear being engaged with the reduction driven gear wherein the vertical transmission shaft comprises a lower shaft portion having the bevel gear and an upper shaft portion located there above and these portions are welded to each other at a portion thereof located adjacent an upper portion of the bevel gear.
Namely, the lower shaft portion of the transmission shaft having the drive bevel gear and the upper shaft portion are manufactured independently to each other and finishing process is given to the drive bevel gear and thereafter both of the upper and lower shaft portions of the transmission shaft are welded to a single one.'' Therefore, even if the bevel gear is made with the irreducible minimum diameter of a demand, there occurs an inconvenience of contacting a cut-tying tool with the transmission shaft when cutting the teeth ~.23~ 62 of the drive gavel gear.
Accordingly, the input rotation power to the different trial mechanism can be reduced to a predetermined low rota-lion and transmitted to the right and left wheels without increasing a reduction ratio in the reduction construction or mechanism between the reduction driven gear and the vertical transmission shaft by enlarging the diameter of the driven gear or increasing the reduction ratio of -the differential mechanism by enlarging the diameter of a gear in mesh with the input pinion gear to the differential mechanism. Thus, it becomes possible to make the differ-entail mechanism compact while minimizing a reduction mocha-noisome which comprises the drive bevel gear and the reduction driven gear and as the result, it enables to raise the height of the differential mechanism case sufficiently from the ground without raising the center of gravity of the tractor body as in the case of extension of a vertical trays-mission shaft, so that even if ridges are located between the right and left wheels, it may be possible to carry out operation or working favorably while satisfactorily evading contact between the ridges or crop and the differential mechanism or other transmission mechanisms and then traveling safely by positioning the center of gravity of the tractor body low.
Other objects and advantages will be apparent from the ~IL23~L(.b~f~
following description with reference to the drawings.
Brief Description of the Drawings The drawings show an embodiment of a wheel drive Papa-fetus for an agricultural tractor according to this invent lion in which:-Fig. 1 is a side view of the agricultural tractor, Fig. 2 is a rear view of mounting portions of frontals partly broken away and partly developed, Fig. 3 is a front view of a vertical transmission shaft, and Fig. 4 is an enlarged side view of a lower end portion of the vertical transmission shaft having a spiral bevel gear.
Description of the Preferred Embodiment 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 non-dirigible 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 at the rear end thereof for driving the attached working implement. I
As shown in 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 ~23~l(.b6'~
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 Pi 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 herein-after. The drive case 6 comprises a case portion 12 formed of a length of structural steel pipe and two cast case port lions 11, the case portion 11 constituting an intermediate portion and the case portions 11 constituting the right and left ends of the drive case 6, respectively. The case portion 12 houses a differential mechanism 13 at an inter-mediate position thereof and a right and left pair of trays- , tersely extending transmission shafts 14 operatively connected to a right and left pair of output gears aye and 13b of the differential mechanism 13, respectively. Each of the case portions 11 houses a vertically extending trays-mission shaft 16 operatively connected to one of the trays-verse transmission shafts 14 through a bevel gear mechanism ~Z3~ ii2 15 acting as reduction means, and a bevel gear reduction mechanism 19 comprising a spiral bevel gear lo formed integral with a lower end of the vertical transmission shaft 16 and tapered to the upper portion thereof and a reduction driven gear 18 in mesh with the spiral bevel gear 17 and splinted to the axle 5. The bevel gear reduce -lion mechanism 19 has a greater reduction ratio than an verge reduction ratio provided for the right and left front wheels 1 by the differential mechanism 13. The differential mechanism 13 receives an output torque of a transmission 20 through an input shaft 13c, reduces its speed and divides the output to right and left. The divided output is trays-milted to each axle 5 after being reduced by the bevel gear mechanism 15 and 19.
A construction to render the front wheels 1 dirigible will be described next. Each of the case portions 11 comprises a stationary case portion 21 housing the vertical transmission shaft 16 and fixed to a flange aye of the 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 Pi coaxial with the vertical transmission shaft 16. The oscillatable case portion 22 is oscillatable by means of a knuckle arm 23.
Bores aye and 24b, as seen in Fig. 2, are openings for lubricating oil.
~Z3~.b6Z
As shown in Fig. 3, the vertical transmission shaft 16 comprises a lower shaft portion aye having the spiral bevel gear 17 and an upper shaft portion 16b located there above and these portions aye and 16b are welded by friction welding to each other at a portion 25 located adjacent an upper portion of the spiral bevel gear 17.
Namely, the vertical transmission shaft 16 is divided into the lower shaft portion aye and the upper shaft portion 16b at the portion 25 which is not contacted with a cutting tool moving in the longitudinal direction of the teeth of the spiral bevel gear 17; in other words the portion 25 being located on the side of the spiral bevel gear 17 to a cross point of an elongated line 26 of the bottoms of the teeth of the spiral bevel gear 17 and an outer periphery of -the vertical transmission shaft 16, and thus manufactured independently and then finishing process is given to the spiral bevel gear 17. Thereafter, these portions aye and ; 16b are welded to each other into a single shaft.
Weld of the lower shaft portion aye and the upper port lion 16b may be practiced by arc welding, gas welding or resistance welding. Further, the reduction driven gear 18 may be operatively connected to the axle 5 via a reduction mechanism such as a planetary gear.
The above-mentioned embodiment utilizing the spiral bevel gear 17 provides the following advantages.
~Z3~ Z
g Namely, since -the spiral bevel gear is adopted as a transmission gear, the characteristic of a spiral bevel gear which may transmit a high torque by engagement of -a number of teeth thereof greater than those of a normal bevel gear. As a predetermined torque can be transmitted even if the diameter of the bevel gear is made small, rotation to the differential mechanism can be reduced to a predetermined low rotation and transmitted to the wheels without increasing a reduction ratio of a reduction mocha-noisome between the reduction driven gear and the vertical transmission shaft by enlarging the diameter of the reduce lion driven gear or without increasing a reduction ratio of the differential mechanism by enlarging the diameter of a gear in mesh with the input pinion gear of the differential mechanism. Therefore, the differential mechanism can be compact while compacting the reduction mechanism comprising the drive gear and the reduction driven gear, so that the height of the differential mechanism case from the ground may be increased without raising the center of gravity of the tractor body as in the case of making a vertical trays-mission shaft long. As the result, even if ridges are located between the right and left wheels, it may be possible to carry out operation or working favorably while satisfact-rile evading contact between the ridges or crop and the differential mechanism case or other transmission mechanisms ~.Z3~(~6~
and -then traveling safely by positioning the center of gravity of the tractor body low.
Claims (7)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED
AS FOLLOWS:
1. A wheel drive apparatus for an agricultural tractor comprising:
an axle for supporting a wheel;
a reduction driven gear operatively connected to said axle;
a differential mechanism situated on the tractor;
and a vertical transmission shaft means operatively interconnected between the reduction driven gear and the differential mechanism, said vertical transmission shaft means including an upper shaft portion and a lower shaft portion welded to each other, said lower shaft portion having a bevel gear tapered upwardly, welded surfaces of said two portions being situated adjacent to said bevel gear so that imaginary lines extending from bottoms of teeth of the bevel gear intersect a periphery of the upper shaft portion.
an axle for supporting a wheel;
a reduction driven gear operatively connected to said axle;
a differential mechanism situated on the tractor;
and a vertical transmission shaft means operatively interconnected between the reduction driven gear and the differential mechanism, said vertical transmission shaft means including an upper shaft portion and a lower shaft portion welded to each other, said lower shaft portion having a bevel gear tapered upwardly, welded surfaces of said two portions being situated adjacent to said bevel gear so that imaginary lines extending from bottoms of teeth of the bevel gear intersect a periphery of the upper shaft portion.
2. The apparatus as set forth in claim 1 wherein said lower and upper shaft portions are welded to each other by friction welding.
3. A wheel drive structure for an agricultural tractor comprising:
drive case means extended transversely of said tractor for supporting right and left wheels, said means including a first case member and a pair of second case members connected to opposite ends of said first case member;
said first case member having a steel pipe and differential means in an intermediate portion thereof;
each second case member having reduction means operatively connected to said differential means, said reduction means including vertical transmission shaft means having an upper shaft portion and a lower shaft portion welded to each other,said lower shaft portion having a bevel gear tapered upwardly, welded surfaces of said two portions being situated adjacent to said bevel gear so that imaginary lines extending from bottoms of teeth of the bevel gear intersect a periphery of the upper shaft portion.
drive case means extended transversely of said tractor for supporting right and left wheels, said means including a first case member and a pair of second case members connected to opposite ends of said first case member;
said first case member having a steel pipe and differential means in an intermediate portion thereof;
each second case member having reduction means operatively connected to said differential means, said reduction means including vertical transmission shaft means having an upper shaft portion and a lower shaft portion welded to each other,said lower shaft portion having a bevel gear tapered upwardly, welded surfaces of said two portions being situated adjacent to said bevel gear so that imaginary lines extending from bottoms of teeth of the bevel gear intersect a periphery of the upper shaft portion.
4. The structure as set forth in claim 3 wherein said upper and lower shaft portions are welded to each other by friction welding.
5. A transmission shaft for a reduction gearing adapted to be used for an agricultural tractor comprising an upper shaft portion and a lower shaft portion welded to each other;
said lower shaft portion having a bevel gear tapered upwardly, said bevel gear having bottoms of teeth;
welded surfaces of said two portions being situated adjacent to said bevel gear so that imaginary lines extending from the bottoms of the teeth of said bevel gear intersect a periphery of said upper shaft portion.
said lower shaft portion having a bevel gear tapered upwardly, said bevel gear having bottoms of teeth;
welded surfaces of said two portions being situated adjacent to said bevel gear so that imaginary lines extending from the bottoms of the teeth of said bevel gear intersect a periphery of said upper shaft portion.
6. The transmission shaft as set forth in claim 5, wherein said upper and lower shaft portions are welded to each other by friction welding.
7. The transmission shaft as set forth in claim 6, wherein said bevel gear is a spiral bevel gear for transmitting a high torque.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59009144A JPS60154915A (en) | 1984-01-21 | 1984-01-21 | Power transmission structure for wheels of farm tractor |
| JP9144/1984 | 1984-01-21 | ||
| JP11512/1984 | 1984-01-24 | ||
| JP59011512A JPS60154917A (en) | 1984-01-24 | 1984-01-24 | Power transmission structure for wheels of farm tractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1231062A true CA1231062A (en) | 1988-01-05 |
Family
ID=26343806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000472522A Expired CA1231062A (en) | 1984-01-21 | 1985-01-21 | Wheel drive apparatus for an agricultural tractor |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR890002689B1 (en) |
| CA (1) | CA1231062A (en) |
| DE (1) | DE3501578A1 (en) |
| FR (1) | FR2558557B1 (en) |
| GB (1) | GB2155416B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19826067B4 (en) | 1998-06-12 | 2007-11-22 | Zf Friedrichshafen Ag | Transmission for a steerable drive wheel of a material handling vehicle |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2281451A (en) * | 1940-04-12 | 1942-04-28 | Scammell Lorries Ltd | Driving gear for steering road wheels of motor vehicles |
| JPS589011B2 (en) * | 1974-08-13 | 1983-02-18 | 株式会社クボタ | Front wheel drive equipment for tractors, etc. |
| JPS55138127U (en) * | 1979-03-23 | 1980-10-02 |
-
1985
- 1985-01-17 GB GB08501191A patent/GB2155416B/en not_active Expired
- 1985-01-18 DE DE19853501578 patent/DE3501578A1/en active Granted
- 1985-01-19 KR KR1019850000311A patent/KR890002689B1/en not_active IP Right Cessation
- 1985-01-21 CA CA000472522A patent/CA1231062A/en not_active Expired
- 1985-01-21 FR FR858500785A patent/FR2558557B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB2155416B (en) | 1988-03-09 |
| DE3501578C2 (en) | 1988-03-24 |
| KR850005344A (en) | 1985-08-24 |
| GB2155416A (en) | 1985-09-25 |
| GB8501191D0 (en) | 1985-02-20 |
| FR2558557A1 (en) | 1985-07-26 |
| FR2558557B1 (en) | 1990-04-06 |
| DE3501578A1 (en) | 1985-08-01 |
| KR890002689B1 (en) | 1989-07-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |