CA1223215A - Wheel drive structure for agricultural tractor - Google Patents
Wheel drive structure for agricultural tractorInfo
- Publication number
- CA1223215A CA1223215A CA000472509A CA472509A CA1223215A CA 1223215 A CA1223215 A CA 1223215A CA 000472509 A CA000472509 A CA 000472509A CA 472509 A CA472509 A CA 472509A CA 1223215 A CA1223215 A CA 1223215A
- Authority
- CA
- Canada
- Prior art keywords
- case
- differential
- gear
- drive
- bearing means
- 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
- 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)
- Motor Power Transmission Devices (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
- Retarders (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A wheel drive assembly for an agricultural tractor, comprises a drive case housing a differential mechanism and reduction mechanisms for transmitting power from said dif-ferential mechanism to wheels. The drive case comprises first and second case portions, and said first case portion is made of a structural steel pipe.
A wheel drive assembly for an agricultural tractor, comprises a drive case housing a differential mechanism and reduction mechanisms for transmitting power from said dif-ferential mechanism to wheels. The drive case comprises first and second case portions, and said first case portion is made of a structural steel pipe.
Description
~2~32~5 This invention relates to a drive assembly 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 right hand end and a left hand end thereof and reduction mechanisms in the right hand end and -the left hand end, rest pectively, 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 dip-feren-tial mechanism and a pair of transmission shafts opera-lively connecting the differential mechanism to the two reduction mechanisms, respectively, the higher is that port lion of the drive case from the ground and the less likely is the drive case to come into contact with ridges or crops 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, i-t has been conventional for the portion of the drive case housing the differential mechanism and the trays-mission shafts to comprise a combination of individual parts, namely a part for housing the differential 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.
I
A primary object of the invention is to provide a drive case whose portion housing the differential mechanism and trays-mission shafts has a maximum height above the ground and which may be manufactured at low cost.
' According to the present invention there is provided a wheel drive structure for an agricultural tractor comprising:
drive case means extended transversely of said tractor for sup-porting right and left wheels, said drive case means comprising a first case member and a pair of second case members connected to opposite ends of said first case member; said first case member being formed of a length of structural steel pipe and housing a differential means in an intermediate portion thereof and a pair of differential output shafts extending in opposite directions from said differential means; said differential means including a driving gear operatively connected to a differential input shaft and a differential gear case fixedly secured to said driving gear, said driving gear and said differential gear case having a substantially same outer diameter; said second case members each housing reduction means, said reduction means operatively con-netted to one of said differential output shafts from said dip-ferential means for driving one of said wheels, said reduction means having a greater reduction ratio than an average reduction ratio of said differential means.
A described above, the first case portion comprises
With the above tractor, the smaller the outside diameter of a portion of the drive case housing the dip-feren-tial mechanism and a pair of transmission shafts opera-lively connecting the differential mechanism to the two reduction mechanisms, respectively, the higher is that port lion of the drive case from the ground and the less likely is the drive case to come into contact with ridges or crops 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, i-t has been conventional for the portion of the drive case housing the differential mechanism and the trays-mission shafts to comprise a combination of individual parts, namely a part for housing the differential 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.
I
A primary object of the invention is to provide a drive case whose portion housing the differential mechanism and trays-mission shafts has a maximum height above the ground and which may be manufactured at low cost.
' According to the present invention there is provided a wheel drive structure for an agricultural tractor comprising:
drive case means extended transversely of said tractor for sup-porting right and left wheels, said drive case means comprising a first case member and a pair of second case members connected to opposite ends of said first case member; said first case member being formed of a length of structural steel pipe and housing a differential means in an intermediate portion thereof and a pair of differential output shafts extending in opposite directions from said differential means; said differential means including a driving gear operatively connected to a differential input shaft and a differential gear case fixedly secured to said driving gear, said driving gear and said differential gear case having a substantially same outer diameter; said second case members each housing reduction means, said reduction means operatively con-netted to one of said differential output shafts from said dip-ferential means for driving one of said wheels, said reduction means having a greater reduction ratio than an average reduction ratio of said differential means.
A described above, the first case portion comprises
- 2 -
3;~5 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 crop 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 per-foraying 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 come sensate for inability to provide a large 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, reduce lion 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 decree the outside diameter of the differ-~2;~32~5 entail mechanism, it is compensated for by the reduction mechanisms each having a greater reduction ratio -that 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 described in more detail, by way of example only, with reference to the accompanying drawings, 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 assembly;
Fig. 3 is a partly developed front view of the front wheel mounting assembly; and Fig. 4 is a sectional view taken on line IV-IV of Fig. 3 -- a --AL
Referring to Fig. 1, an agricultural tractor come proses a four wheel drive vehicle having a right and left pelf of steerable front wheels 1 and a right and left pair of non steerable 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 at the rear end thereof for driving the attached working implement.
us 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 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 Verdi-gaily oscillatable in opposed relationship with each other about the axis Pi, whereby the tractor body maintains a sub-staunchly horizontal altitude regardless of an incline of the ground transversely of the tractor.
A front wheel drive assembly will now be described.
The drive case 6 comprises a first case portion 12 ~2~2~i formed owe a length of structural steel pipe-and two second, cast case portions 11, the first case portion 12 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 12 houses a differ-entail mechanism 13 at an intermediate position thereof and a right and left pair of transversely extending transmission shafts I operatively connected to a right and left pair of side gears or output gears aye of the differential mechanism 13, respectively. Each of the second case portions 11 houses a vertically extending transmission shaft 16 opera-lively connected to one of the transverse transmission shafts 14 through a bevel gear mechanism 15 acting as reduction means, and a bevel gear reduction mechanism 19 comprising a small drive gear 17 formed integrally with a lower end of the vertical transmission shaft 16 and a large driven gear 18 in mesh with the small gear 17 and splinted to the axle 5.
The bevel gear reduction mechanism 19 has a greater reduction ratio than an average 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 shalt 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.
25 the bevel gear mechanisms 15 and 19. Number eye in Fig. 2 7~73~
denotes a drive pinion gear, and number doughnuts a pair of pinion gears.
A shown in tug 2, the firs-t case portion 12 contains two position setting tubes 12' to retain bearings 13' of the differential mechanism 13 in position axially of the trays-verse transmission shafts I These tubes 12' are removably inserted into the first case portion 12 and retain thy bear-ins 13' in position by abutting against the bearings 13' and against case portions 21 to be described hereinbelow.
A construction Jo render the front wheels 1 steerable;-will be described next. Each of -the second case portions 11 comprises a stationary case portion 21 housing the Verdi-eel transmission shaft 16 and fixed to a flange aye of the first case portion 12 7 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.
The first case portion 12 defines a bore 24, as seen in Fig. 2, to permit lubricating oil in the first case portion 12 to flow into the boss 9 as lubricant between the boss 9 , and the tubular support 7.
The bevel gear reduction mechanism 19 may-be replaced by a planetary reduction mechanism, and they are generally US
referred to as a 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 Or the differential mechanism 13. This embodiment will S particularly be described hereinafter using like reference number for like components in the preceding embodiment.
was shown in 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 to a pair of front and rear bosses 9 and 10 provided on a tractor body, to be 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 first case portion 12 formed of a length of structural steel pipe and two second, cast case portions 11, the first case portion 12 constituting an intermediate portion and the second case portions 11 ~22~2~S - , constituting the right and left ends of the drive case 6, respectively. The first case portion 12 houses a differ-entail mechanism 13 and a right and left pair of transversely extending transmission shafts 14 operatively connected to a right and left pair of snide gears of the differential mocha-noisome 13, respectively. Each of the second case portions 11 houses a vertically extending transmission shaft 16 opera-lively connected to one of the transverse transmission shafts 14 through a bevel gear mechanism 15 acting as reduction means, and a bevel gear reduction mechanism 19 comprising a small drive gear 17 formed integral with a lower end of the vertical transmission shaft 16 and a large driven gear 18 in mesh with the small gear 17 splinted to the axle 5.
The differential mechanism 13 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 15 and 19.
A construction to render the front wheels 1 steerable _:
will be described next. Each of the second case portions.ll comprises a stationary case portion 21 housing the vertical transmission shaft 16 and fixed to a flange aye 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 Pi coaxial with the ~L~Z~32~i vertical transmission shaft 16. The oscillatable case portion 22 is oscillated by means of a knuckle arm 23.
The differential mechanism 13 comprises a drive pinion gear eye, a driving gear 13c, and a differential portion 28.
The differential portion 28 includes a differential gear case 26 fixed to the driving gear 13c by four bolts 25 extending through a space between bearings 13' of the differ-entail gear cave 26 through a support pin 27, and the pair of side gears aye attached to the differential gear case 26 and the driving gear 13c, respectively. As seen in Fig. 3, the differential portion 28 and the drive pinion gear eye are opposed to each other transversely of the tractor across the driving gear 13c. Further, the driving gear 13c and the differential gear case 26 have similar outside diameters to render the differential mechanism 13 compact.
Reference number 12' denotes a position setting tube abutting at one end thereof against one of the bearings 13' of the differential mechanism 13 and at the other end against the flange aye, the other bearing 13' being held in position by a snap ring fitted to the first case portion 12, whereby the differential mechanism 13 is fixed in position in the first case portion 12. This construction involving only one position setting tube has the advantage of low menu-lecturing cost over the preceding embodiment in which two position setting tubes are used.
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 per-foraying 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 come sensate for inability to provide a large 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, reduce lion 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 decree the outside diameter of the differ-~2;~32~5 entail mechanism, it is compensated for by the reduction mechanisms each having a greater reduction ratio -that 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 described in more detail, by way of example only, with reference to the accompanying drawings, 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 assembly;
Fig. 3 is a partly developed front view of the front wheel mounting assembly; and Fig. 4 is a sectional view taken on line IV-IV of Fig. 3 -- a --AL
Referring to Fig. 1, an agricultural tractor come proses a four wheel drive vehicle having a right and left pelf of steerable front wheels 1 and a right and left pair of non steerable 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 at the rear end thereof for driving the attached working implement.
us 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 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 Verdi-gaily oscillatable in opposed relationship with each other about the axis Pi, whereby the tractor body maintains a sub-staunchly horizontal altitude regardless of an incline of the ground transversely of the tractor.
A front wheel drive assembly will now be described.
The drive case 6 comprises a first case portion 12 ~2~2~i formed owe a length of structural steel pipe-and two second, cast case portions 11, the first case portion 12 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 12 houses a differ-entail mechanism 13 at an intermediate position thereof and a right and left pair of transversely extending transmission shafts I operatively connected to a right and left pair of side gears or output gears aye of the differential mechanism 13, respectively. Each of the second case portions 11 houses a vertically extending transmission shaft 16 opera-lively connected to one of the transverse transmission shafts 14 through a bevel gear mechanism 15 acting as reduction means, and a bevel gear reduction mechanism 19 comprising a small drive gear 17 formed integrally with a lower end of the vertical transmission shaft 16 and a large driven gear 18 in mesh with the small gear 17 and splinted to the axle 5.
The bevel gear reduction mechanism 19 has a greater reduction ratio than an average 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 shalt 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.
25 the bevel gear mechanisms 15 and 19. Number eye in Fig. 2 7~73~
denotes a drive pinion gear, and number doughnuts a pair of pinion gears.
A shown in tug 2, the firs-t case portion 12 contains two position setting tubes 12' to retain bearings 13' of the differential mechanism 13 in position axially of the trays-verse transmission shafts I These tubes 12' are removably inserted into the first case portion 12 and retain thy bear-ins 13' in position by abutting against the bearings 13' and against case portions 21 to be described hereinbelow.
A construction Jo render the front wheels 1 steerable;-will be described next. Each of -the second case portions 11 comprises a stationary case portion 21 housing the Verdi-eel transmission shaft 16 and fixed to a flange aye of the first case portion 12 7 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.
The first case portion 12 defines a bore 24, as seen in Fig. 2, to permit lubricating oil in the first case portion 12 to flow into the boss 9 as lubricant between the boss 9 , and the tubular support 7.
The bevel gear reduction mechanism 19 may-be replaced by a planetary reduction mechanism, and they are generally US
referred to as a 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 Or the differential mechanism 13. This embodiment will S particularly be described hereinafter using like reference number for like components in the preceding embodiment.
was shown in 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 to a pair of front and rear bosses 9 and 10 provided on a tractor body, to be 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 first case portion 12 formed of a length of structural steel pipe and two second, cast case portions 11, the first case portion 12 constituting an intermediate portion and the second case portions 11 ~22~2~S - , constituting the right and left ends of the drive case 6, respectively. The first case portion 12 houses a differ-entail mechanism 13 and a right and left pair of transversely extending transmission shafts 14 operatively connected to a right and left pair of snide gears of the differential mocha-noisome 13, respectively. Each of the second case portions 11 houses a vertically extending transmission shaft 16 opera-lively connected to one of the transverse transmission shafts 14 through a bevel gear mechanism 15 acting as reduction means, and a bevel gear reduction mechanism 19 comprising a small drive gear 17 formed integral with a lower end of the vertical transmission shaft 16 and a large driven gear 18 in mesh with the small gear 17 splinted to the axle 5.
The differential mechanism 13 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 15 and 19.
A construction to render the front wheels 1 steerable _:
will be described next. Each of the second case portions.ll comprises a stationary case portion 21 housing the vertical transmission shaft 16 and fixed to a flange aye 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 Pi coaxial with the ~L~Z~32~i vertical transmission shaft 16. The oscillatable case portion 22 is oscillated by means of a knuckle arm 23.
The differential mechanism 13 comprises a drive pinion gear eye, a driving gear 13c, and a differential portion 28.
The differential portion 28 includes a differential gear case 26 fixed to the driving gear 13c by four bolts 25 extending through a space between bearings 13' of the differ-entail gear cave 26 through a support pin 27, and the pair of side gears aye attached to the differential gear case 26 and the driving gear 13c, respectively. As seen in Fig. 3, the differential portion 28 and the drive pinion gear eye are opposed to each other transversely of the tractor across the driving gear 13c. Further, the driving gear 13c and the differential gear case 26 have similar outside diameters to render the differential mechanism 13 compact.
Reference number 12' denotes a position setting tube abutting at one end thereof against one of the bearings 13' of the differential mechanism 13 and at the other end against the flange aye, the other bearing 13' being held in position by a snap ring fitted to the first case portion 12, whereby the differential mechanism 13 is fixed in position in the first case portion 12. This construction involving only one position setting tube has the advantage of low menu-lecturing cost over the preceding embodiment in which two position setting tubes are used.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A wheel drive structure for an agricultural tractor comprising: drive case means extended transversely of said trac-tor for supporting right and left wheels, said drive case means comprising a first case member and a pair of second case members connected to opposite ends of said first case member; said first case member being formed of a length of structural steel pipe and housing a differential means in an intermediate portion thereof and a pair of differential output shafts extending in opposite directions from said differential means; said differential means including a driving gear operatively connected to a differential input shaft and a differential gear case fixedly secured to said driving gear, said driving gear and said differential gear case having a substantially same outer diameter; said second case mem-bers each housing reduction means, said reduction means opera-tively connected to one of said differential output shafts from said differential means for driving one of said wheels, said reduction means having a greater reduction ratio than an average reduction ratio of said differential means.
2. The structure of claim 1 wherein said driving gear and said differential gear case are integrally interconnected by a tubular member, said tubular member being rotatably mounted on one of said differential output shafts.
3. The structure of claim 2 wherein said each second case member comprises a stationary case portion fixed to said first case member and an oscillatable case portion oscillatably supported around said stationary case portion and including an axle, said stationary portion having a tubular flange portion fitted in an inner surface of said first case member.
4. The structure of claim 3 wherein said differential gear case and said driving gear are rotatably supported by first and second bearing means, respectively, said first and second bearing means being retained in positions thereof by position setting tubes arranged between said first and second bearing means and respective said tubular flange portions.
5. The structure of claim 4 wherein said each position setting tube is concentrically arranged with and inserted within said first case member.
6. The structure of claim 5 wherein said each reduc-tion means comprises a bevel gear interlocking mechanism includ-ing a drive gear attached to a vertical transmission shaft opera-tively connected to said differential output shaft by bevel gear-ing, and attached to said axle.
7. The structure of claim 3 wherein said differential gear case and said driving gear are rotatably supported by first and second bearing means means, respectively, said first bearing means being retained in its position by a first position setting tube arranged between said first bearing means and said tubular flange portion of one of said stationary portion, said second bearing means being retained in its position by a second position setting tube arranged between said first and second bearing means.
8. The structure of claim 7 wherein said each position setting tube is concentrically arranged with and inserted within said first case member.
9. The structure of claim 8 wherein said each reduc-tion means comprises a bevel gear interlocking mechanism includ-ing a drive gear attached to a vertical transmission shaft opera-tively connected to said differential output shaft by bevel gear-ing, and attached to said axle.
Applications Claiming Priority (4)
| 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 |
| JP9145/1984 | 1984-01-21 | ||
| JP37048/1984 | 1984-01-27 | ||
| JP59037048A JPS60179329A (en) | 1984-02-27 | 1984-02-27 | Differential gear apparatus for wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1223215A true CA1223215A (en) | 1987-06-23 |
Family
ID=26343807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000472509A Expired CA1223215A (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) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2692525B1 (en) * | 1992-06-19 | 1994-10-07 | Henry Dangel | Rigid bridge for all terrain vehicle. |
| US6056081A (en) * | 1997-10-16 | 2000-05-02 | Case Corporation | Mechanical front wheel drive axle for improved steering |
| DE10143886C1 (en) * | 2001-09-07 | 2002-12-12 | Bayerische Motoren Werke Ag | Power take-off gear for vehicles has a pinion gear with hollow cylindrical recesses in which bearings are arranged |
| DE102010012515B4 (en) * | 2010-03-24 | 2019-08-29 | Audi Ag | Car with a drive unit |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US876070A (en) * | 1906-07-23 | 1908-01-07 | William H Donner | Automobile. |
| GB283653A (en) * | 1926-10-15 | 1928-01-16 | Edward Steptoe Evans | Improvements in motor vehicles |
| US3862667A (en) * | 1972-09-28 | 1975-01-28 | Eaton Corp | Drop center drive steer axle |
| 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 | ||
| JPS5835406U (en) * | 1981-09-02 | 1983-03-08 | 株式会社クボタ | tractor axle case |
| NL8203381A (en) * | 1982-08-31 | 1984-03-16 | Lely Nv C Van Der | TRACTOR. |
-
1985
- 1985-01-19 KR KR1019850000312A patent/KR910000882B1/en not_active IP Right Cessation
- 1985-01-21 FR FR19858500800A patent/FR2558419B1/en not_active Expired - Lifetime
- 1985-01-21 GB GB08501459A patent/GB2154959B/en not_active Expired
- 1985-01-21 CA CA000472509A patent/CA1223215A/en not_active Expired
- 1985-01-21 DE DE19853501798 patent/DE3501798A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| KR850005345A (en) | 1985-08-24 |
| DE3501798A1 (en) | 1985-08-01 |
| GB2154959B (en) | 1988-01-27 |
| DE3501798C2 (en) | 1989-07-27 |
| GB8501459D0 (en) | 1985-02-20 |
| FR2558419A1 (en) | 1985-07-26 |
| FR2558419B1 (en) | 1990-07-20 |
| GB2154959A (en) | 1985-09-18 |
| KR910000882B1 (en) | 1991-02-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |