JPH07195902A - Car height regulating device of running vehicle - Google Patents

Abstract

PURPOSE:To make it unnecessary to provide a clutch making the front wheels driving and the rear wheels nondriving, and to carry out two operations to raise the front wheels at first and then to make the rear wheels run over to be raised, by a single driving operation, by the advancing drive of a tractor. CONSTITUTION:The car body is moved forward by the driving force of the rear wheels in the condition the rotation from a front axle to a regulating rotary axle is made impossible, and by revolving the front wheels while being autorotated, a front wheel case rotates around the regulating rotary axle to make the height of the front wheels movable upward, and the rear wheels 11 immovable forward rearward. And by driving the rear axle 31 by the engine, the rear wheel case rotates around the rear axle 7, and the height of the rear wheels 11 is made movable upward. Furthermore, the system is composed to convert the four-wheel drive, the two-wheel drive, and the vehicle height regulation in a single converting lever. And a detent mechanism to stop the rear wheel case 3 at the uppermost position tentatively is also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables a vehicle height adjusting device for a traveling vehicle such as a tractor without using a device such as a crane or a lift, by utilizing the driving force of an engine mounted on the vehicle. It is a thing.

[0002]

2. Description of the Related Art Conventionally, a technique relating to a vehicle height adjusting device for a traveling vehicle has been publicly known. For example, actual fairness 3
It is like the technique described in JP-A-201787, JP-A-62-273124, and JP-A-63-129627. However, in the technique disclosed in Japanese Utility Model Publication No. 3-20187, a rear wheel clutch is necessary, and a lock body for preventing rotation is required to be contacted under the front wheel so that the front wheel does not rotate. Of. In addition, JP-A-6
In the technique described in JP-A-2-273124, it is necessary to provide a descending lock mechanism that prevents rotation in the direction in which the vehicle height becomes lower. In addition, the actual development Sho 63-1296
Also in Japanese Patent No. 27, there is a problem that a rear wheel clutch mechanism is necessary.

In another prior art, the structure for vertically adjusting the axle of the front wheels has a shaft eccentric to the axle, and both are integrally formed in the final deceleration case. Since the vehicle height was adjusted by removing it and changing it up and down, completely remove the fixed state between the rear axle housing and the final deceleration case, and lift the machine with a crane or lift to adjust the vehicle height. Because I was doing it, I could only adjust the vehicle height at a maintenance shop with sufficient facilities.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to enable a work in an orchard or a sloping land which is required to be stably run under the branches of a fruit tree by being constructed with a low vehicle height. is there. Alternatively, the wheel height can be freely changed according to various tasks such as field maintenance work and wetland work that require a high vehicle height so that part of the machine does not collide with ridges or the ground. It is what In addition, the vehicle height can be adjusted without the need for a crane or a lift as in the conventional vehicle height adjustment technology for traveling vehicles, and the vehicle height can be adjusted by an operator without relying on human power. It is configured in.

Further, the tractor may perform not only outdoor work but also indoor work, for example, in a greenhouse.
In this case, a tractor with a high vehicle height cannot work. For this reason, a tractor with a low vehicle height is required. In this way, it is uneconomical to prepare tractors having different vehicle heights according to the work application, and in order to reinforce this drawback, it is possible to easily adjust the vehicle height with one tractor. is there. In such a vehicle height adjusting device for a traveling vehicle, there is no need to provide a front-wheel-drive rear-wheel non-drive clutch for disconnecting the drive of the rear wheels in order to raise the front wheels as in the conventional case, and the tractor By driving in the forward direction, the aircraft first moves forward to raise the front wheels, and if the front wheels cannot move at that position, then the rear wheels ride up and move up. The front lock mechanism is provided so that it can be performed by. This eliminates the need to arrange the lock member under the wheel for adjusting the vehicle height.

[0006]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. In claim 1, the adjustment rotary shaft 5
Front wheel axle case 4 which rotates around the center, and the adjustment rotation shaft 5
An axle gear 8 that revolves around the front wheel axle case 4 is provided while rotating around a rotating gear 15 that is fixed to the front wheel axle, and the axle gear 8 is fixed to the front axle 6 that is pivotally supported by the front wheel axle case 4,
The front wheel 1 is fixed to the front axle 6, and the front axle shaft 18
A mechanism for disabling the front axle shaft 1 is provided.
In the state in which the rotation from 8 to the adjustment turning shaft 5 is disabled, the vehicle body is moved forward by the rear wheel driving force, and the front wheel 1 revolves while rotating, so that the front wheel axle case 4 surrounds the adjustment turning shaft 5. To make it possible to raise the vehicle height of the front wheel 1,
Rear axle case 3 that rotates around the rear axle shaft 31
And an axle gear 2 that revolves around the rotation gear 44 fixedly mounted on the rear axle shaft 31 while revolving around the rear axle case 3 while rotating around the rotation gear 44, and after pivoting the axle gear 2 on the rear axle case 3. Rear wheel 11 fixed to the axle 7 and fixed to the rear axle 7
By making the rear axle shaft 31 immovable and driving the rear axle shaft 31 by the engine, the rear wheel axle case 3 rotates around the rear axle 7 by the driving force, and the vehicle height of the rear wheel 11 can be increased. Is.

According to the second aspect of the present invention, the switching between the four-wheel drive, the two-wheel drive, and the vehicle height adjustment is configured by one switching lever 14.

In the third aspect, the detent mechanism for temporarily stopping the rear wheel axle case 3 at the raised position is provided.

[0009]

[Operation] Next, the operation will be described. When adjusting the vehicle height, the engine is driven, the fixing bolts 65 and 66 of the front wheels are removed, the low position fixing portion 35 of the rear wheels is removed, and the switching lever 14 is operated to the position where the front mechanism is locked. In this case, only the rear wheels are driven by two wheels, and the front wheels are fixed with the front axle shaft 18 to the adjustment pivot shaft 5 being locked. However, the front wheel 1 is forcibly rotated because the vehicle body advances due to the driving force of the rear wheel 11. The forced rotation force of the front wheels causes the axle gears 8 of the front wheels to ride on the rotating gear 15, and the front wheel axle case 4 rotates to increase the vehicle height of the front wheels. When the front wheel axle case 4 reaches a high position, the casting projection provided on the inner case 4b of the front wheel axle case 4 and the casting projection provided on the rotation guide ring 60 engage with each other to rotate further. Do not enter the stopper state.

When the vehicle height becomes high and the stoppers of the casting case are engaged with each other, the machine cannot move, and when the rear wheel is driven further, the axle gear 2 of the rear wheel 11 becomes the rotating gear 44. A state of riding up occurs. This allows
The rear wheel axle case 3 rotates to set the rear wheel vehicle height to a high position. Since the detent mechanism D is fitted in this position, even if the operator gets out of the seat, the state in which the machine body does not descend at once occurs. In this state, the rear wheel axle case 3
Is fixed to the high position fixing portion 34 with bolts, and the front wheel axle case 4 is fixed to the high position with fixing bolts 65 and 66. In the case of lowering the position, it can be done by moving the aircraft backward.

In the second aspect, the switching lever 14 for four-wheel drive and two-wheel drive is a lever required even in the case of a normal tractor, and can be used as a lever for adjusting the vehicle height. Even though the vehicle height adjusting device is configured, the cost does not increase. Further, a switching lever 14 for four-wheel drive and two-wheel drive has been conventionally arranged, and it is difficult to provide another lever at this portion. However, by using the same lever, the lever does not get confused.

According to the third aspect of the present invention, it is necessary to quickly screw the fixing bolt to the high position fixing portion 34 at the position where the vehicle height of the rear wheel 11 has risen. Since it is possible to hold the robot, it is unlikely that the aircraft will suddenly descend and cause personal injury to the operator. When the detent mechanism D is engaged when the rear wheel 11 is in the raised state, the front wheel 1 is also in the raised state, so that the detent mechanism D acts as a detent mechanism D that prevents both the front wheel 1 and the rear wheel 11 from descending. To do. Therefore, it is no longer necessary to provide a detent mechanism for the front wheels only.

[0013]

EXAMPLES Next, examples will be described. 1 is a side view of a tractor whose vehicle height is reduced by the vehicle height adjusting device for a traveling vehicle of the present invention, FIG. 2 is a side view of a tractor whose vehicle height is similarly increased, and FIG. 3 is a mission case of the vehicle. FIG. 4 is a sectional view of the M portion, FIG. 4 is an enlarged side sectional view of the front wheel speed increasing mechanism and the front wheel locking mechanism portion, FIG. 5 is a drawing of the switching lever 14 arranged on the side surface of the clutch housing H portion, and FIG. FIG. 7 is a cross-sectional view and a side view of the rear wheel axle case 3 and the rear axle shaft 31 in a state where the vehicle height is lowered. FIG. 7 is a rear wheel axle case 3 and a rear axle shaft 31 in which the vehicle height of the rear wheel 11 is also increased. It is sectional drawing and the side view of the part of.

FIG. 8 is a rear sectional view of a fixed portion of the rear wheel axle case 3 and the rear axle case 10, and FIG. 9 is a side view of the rear wheel axle case 3 and the rear axle case 10.
10 is a sectional view of the detent mechanism of the rear wheel 11, FIG. 11 is a rear sectional view and a side view in which the vehicle height of the front wheel 1 is lowered, and FIG.
2 is a rear sectional view and a side view in which the vehicle height of the front wheels 1 is also increased, FIG. 13 is a view showing another embodiment of the front wheel axle case 4, and FIG. 14 is a fixed side bevel gear box 61 and a rotating side bevel gear box. 62 is a sectional view of an embodiment in which a shutoff oil seal 70 is interposed, FIG. 15 is an enlarged cross sectional view of the portion of the shutoff oil seal 70, FIG. 16 is a side view showing the arrangement of the fuel tank T, and FIG. 17 is the same. 19 is a front view showing the arrangement of the fuel tank T, FIG. 18 is a side view of the fan F, and FIG.
Is a plan view of the fan F, and FIG. 20 is a cross-sectional view of the fan F.

1 and 2, a tractor is shown as a traveling vehicle. Front wheel 1 and rear wheel 1 of the tractor
This is a technique in which the vehicle height of 1 can be adjusted by the driving force of the engine by rotating the front wheel axle case 4 and the rear wheel axle case 3 provided around the front axle 6 and the rear axle 7. Fuel tanks T1 and T2 are provided on the left and right side surfaces of the clutch housing H.
Are arranged. F is a ender.

The internal constructions of the clutch housing H, the center plate C and the transmission case M will be described with reference to FIG. Clutch housing H and center plate C
And a transmission case M, a traveling first shift a for performing four shifts, a traveling second shift for performing forward / reverse shifts, and a traveling third shift for performing further four shifts are arranged in series. Thus, the rotation after the gear shift is transmitted to the pinion shaft 27 to drive the differential gear device 38. Further, a PTO speed change d of four forward rotations and one reverse rotation is configured to drive the PTO shaft 49.

In this structure, the rotation of the pinion shaft 27 is changed from the gear 26 fixed on the pinion shaft 27 to the PT.
The front speed-increasing gear 2 through the loose fitting gear 25 on the O-axis 49
4 and the front wheels are transmitted to the normal gear 23. By switching the front wheel speed increasing switching clutch 20 on the front wheel speed increasing switching shaft 13, either the gear 21 meshing with the front wheel speed increasing gear 24 or the gear 22 meshing with the front wheel normal speed gear 23 can be selectively switched. The front wheel drive shaft 9 is attached to the front end of the front wheel speed increasing switching shaft 13.
Is arranged, and the 4WD / 2WD / lock switching body 16 is provided at the abutting portion of the front wheel speed increasing switching shaft 13 and the front wheel driving shaft 9.
Are arranged.

Next, the operation of the 4WD / 2WD / lock switching body 16 will be described with reference to FIG. The four-wheel drive / two-wheel drive / lock switching body 16 is spline-engaged with the front wheel drive shaft 9. The state in which the 4WD / 2WD / lock switching body 16 is slid rearward and meshed with the engraved gear 28 at the tip of the front wheel speed increase switching shaft 13 is 4WD, and 4WD / 2WD / lock is used. The state in which the switching body 16 is separated from the engraving gear 28 and is also separated from the lock plate 12 is the two-wheel drive state. 4WD / 2
The front mechanism lock state is a state in which the drive / lock switching body 16 is moved forward and meshes with the lock plate 12. The lock plate 12 is loosely fitted on the outer periphery of the front wheel drive shaft 9 and also serves as a bearing device for the front wheel drive shaft 9. The shifter fork 19 also serves as an anchor bolt for locking the rotation of the lock plate 12. The shifter fork 19 is a 4WD / 2WD lock switching body 1.
Although the switching shifter 17 that slides 6 is slidable back and forth, the shifter fork 19 also serves to fix the lock plate 12 to the clutch housing H.

Next, description will be made with reference to FIG. A switching lever 14 is arranged at a position above the clutch housing H where the operator can operate it. The switching lever 14 is pivotally supported on a pivot shaft 45, and the pivot shaft 45 and the switching lever 14
A leaf spring 47 is interposed between the and. When the switching lever 14 is rotated, an operation blocking member 46 is provided at a position that interferes with the direction in which the front lever is locked.

Therefore, even if the operator casually tries to operate the switching lever 14 while the vehicle is running, the operation blocking member 46 interferes with the operation when it is not intended, so that the operator can rotate the switch to the position where the front mechanism is locked. There is no. As a result, the danger that the switching lever 14 is suddenly operated to the position where the front mechanism is in the locked state while the vehicle is traveling and the machine body falls over is avoided. The rotation of the switching lever 14 is transmitted to the operating shaft 30 via the link 44 and the lock mechanism 29, and enters the inside of the clutch housing H to operate the switching shifter 17 back and forth.

Next, the vehicle height adjusting mechanism of the rear wheel 11 will be described with reference to FIGS. 6 and 7. The rear axle case 10 is projected from the rear side surface of the transmission case M of the tractor to the left and right. The rear wheel height adjusting device shown in FIGS. 6 and 7 is formed at the left and right ends of the rear axle case 10. Since the left and right are symmetrical, only one side will be described. As shown in FIG. 9, a rotary position fixing plate 32 is integrally projectingly provided on the tip of the rear axle case 10. The rotation position fixing plate 32 projects from a part of the same cast member as the rear axle case 10 and is rotatable while the rear wheel axle case 3 is in contact therewith. The rear wheel axle case 3 is a single case including the outer case 3a and the inner case 3b. A rear axle 7 is pivotally supported inside a rear wheel axle case 3 constituted by the outer case 3a and the inner case 3b, and an axle gear 2 is fixedly mounted on the rear axle 7. Further, a rear axle shaft 31 protruding from the rear axle case 10 is pivotally supported, and a rotary gear 44 is fixed to a portion of the rear axle shaft 31 bearing inside the rear wheel axle case 3. In the case of traveling of a normal tractor, the axle gear 2 is moved from the rotation gear 44 side.
Is driven to rotate the rear wheel 11.

The rotation position fixing plate 32 is provided with a fixing screw hole for fixing the rear wheel axle case 3 at the rotation position, and this portion is provided in the rear wheel axle case 3. Either the high position fixing portion 34 or the low position fixing portion 35 is fixed by a bolt. Further, on the rotation position fixing plate 32, the detent mechanism D for temporarily fixing the rear wheel axle case 3 and the rear wheel axle case 3 are rotated by the driving force of the tractor at a position where the vehicle height of the rear wheel 11 is once increased by the forward drive of the tractor. There are provided stopper bolt holes 36, 37, 38 for preventing the rear wheel axle case 3 from rotating more than a prescribed amount when the upper and lower parts are moved up and down.

When adjusting to a low vehicle height shown in FIG. 6, the stopper bolt is screwed into the stopper bolt hole 37, and the rear wheel axle case 3 is stopped so as not to rotate beyond this position. . Further, as shown in FIG. 7, when adjusting the rear wheel 11 to a high position, the stopper bolt is screwed into the bolt hole 36.
Is configured not to rotate. Then, at the position where the rear wheel axle case 3 is rotated to the high position as shown in FIG. 7, the rear wheel axle case 3 and the rear wheel 11 are temporarily stopped, and the operator gets off the vehicle and attaches the fixing bolt to the high position fixing portion 34. The detent mechanism D is provided so that it can be stopped only while it can be screwed. The detent mechanism D is arranged at the position shown in FIG. 9, and when the rear wheel axle case 3 is rotated to a high position,
And the detent ball 39 of the detent mechanism D shown in FIG.
However, it is configured to fit into the detent hole 40 provided on the inner case 3b side. In this state, the urging force of the urging spring 41 is such that the vehicle body does not descend.

As shown in FIG. 9, the stroke Y from the rear axle shaft 31 to the detent mechanism D is more than the stroke X from the position of the rear axle shaft 31 at the center of the rear axle case 10 to the rear axle 7. Is configured to be long so that the rear axle shaft 31 can be supported so as not to rotate downward even if the biasing force of the detent mechanism D is small. Further, as shown in FIG. 8, a screw hole for the retaining bolt 33 is provided on the outer periphery of the rear axle case 10, and the tip of the retaining bolt 33 opens the rotation support ball 42 to the boss portion 3c of the rear wheel axle case 3. The rear wheel axle case 3 and the rear axle case 10 are integrated by being pressed against the dynamic ball groove 43.

When adjusting the vehicle height, it is necessary to first remove the fixing bolt of the low position fixing portion 35, and the stopper bolt is screwed into the stopper bolt holes 36, 37, 38 to adjust the vehicle height. Need to be prepared. When the fixing bolts and the stopper bolts are removed from the state where the vehicle height is high, the rear wheel axle case 3 is rotated at a stroke and the detent mechanism D is provided with the rotation position fixing plate 32 so that the operator is not injured. And the inner case 3b. The detent mechanism D is necessary especially at a position where the vehicle height is high, but it may be provided at a low position.

Next, the vehicle height adjusting mechanism for the front wheels 1 will be described with reference to FIGS. 11 and 12. In the case of conventional gears, in the case of the front wheels as well as the rear wheels, due to the forward drive force of the vehicle,
Although the configuration is such that the front wheel 1 is mounted on the fixed axle gear 8, the present invention conversely fixes the adjustment rotary shaft 5 and the rotary gear 15 in the front mechanism locked state, The forward force of the tractor advances the vehicle body, the forward force rotates the front wheels 1, and the rotational force of the front wheels 1 causes the axle gear 8 to rotate. Therefore, the axle gear 8 rotates around the rotating gear 15. It was configured to rise.

That is, the fixed side bevel gear box 61 is fixed to the front end of the front axle case 55.
A rotating side bevel gear box 62 is pivotally supported at the lower end of the fixed side bevel gear box 61 so that the front wheels can rotate. A front wheel axle case 4 is rotatably supported on the outside of the rotating-side bevel gear box 62 via a rotating guide ring 60 so as to be rotatable in a vehicle height adjustment manner. The front wheel axle case 4 is composed of an outer case 4a and an inner case 4b. The front end of the front axle shaft 18 pivotally supported inside the front axle case 55 has a fixed side bevel gear box 61.
A bevel gear 58 is fixed to a portion projecting inward of the bevel gear 5 at the upper end of the king pin 45.
6 is meshed with 6 to transmit the rotation to the king pin 45.
A bevel gear 57 at the lower end of the king pin 45 is meshed with a bevel gear 59 on the adjusting rotary shaft 5.

The bevel gear 59 is fixed to the adjusting rotary shaft 5. A rotary gear 15 is arranged as an engraved gear on the outside of the adjusting rotary shaft 5, and an axle gear 8 fixed to the rear axle 7 meshes with the outer periphery of the rotary gear 15. Then, at a position where the front wheel axle case 4 is rotated up and down, a fixing bolt 6 that is fixed to the rotating side bevel gear box 62.
5, 66 are provided. Further, a stopper projection for preventing further rotation between the front wheel axle case 4 and the rotation guide ring 60 at the raised position is provided as a casting projection for both. The front wheel axle case 4 does not rotate beyond the position where the stopper projection formed of the casting is engaged. When descending, the front wheel axle case 4 rotates in the opposite direction. In FIGS. 14 and 15, the rotation-side bevel gear box 62, the king pin 45, and the rotation guide ring 6 are shown.
An example of the 0 part is shown. In this structure, even when the front wheel axle case 4 is turned up and down to adjust the vehicle height, a large change in the level of the lubricating oil in the front axle case 55 and the fixed side bevel gear box 61 does not occur. In addition, a shutoff oil seal 7 is provided between the fixed side bevel gear box 61 and the rotating side bevel gear box 62.
0 is inserted.

Reference numeral 71 denotes a normal fixed side bevel gear box 6
1 is an oil seal of the rotating portion between the rotating bevel gear box 62 and the rotating bevel gear box 62. In FIG. 13, in the state where the front wheel axle case 4 is rotated to the high and low positions, in both cases, the lubricating oil is sufficiently distributed to the axle gear 8, so that the outer case 4a and the inner case 4b are not covered. The narrow portions 90 and 91 are formed such that the inner side is close to the axle gear 8. This prevents the accident that the axle gear 8 comes to the upper portion and lubrication cannot be sufficiently performed and seizure occurs when the vehicle height is low.

Further, as shown in FIG. 11 and FIG. 12, the front wheel 1 under the strictest low vehicle height condition so that the lower surface of the rotating side bevel gear box 62 does not break the ridge during the ridge straddling work. An imaginary line W of 60 degrees is drawn from the inner ground contact point of the above so that the rotation-side bevel gear box 62 is not located within the range of rising of the imaginary line W. Further, as shown in FIG. 12, when the vehicle height is high,
If the offset amount of the kingpin 45 is too large, a steering problem will occur, so the kingpin offset amount t1
Is set to be equal to or less than half the tire width t2 of the front wheel 1. As a result, it is possible to eliminate the problem that a large moment is generated around the kingpin 45 and the tie rods and cases are damaged during steering or when the front wheels contact an obstacle.

Next, the arrangement of the fuel tank T will be described with reference to FIGS. 16 and 17. In this configuration, the fuel tank T
Are arranged on the left and right of the clutch housing H as T1 and T2. The lower surfaces of the fuel tanks T1 and T2 are arranged above the lower surfaces of the transmission case M and the clutch housing H. With this configuration, there is no possibility that the lower surfaces of the fuel tanks T1 and T2 come into contact with the ground or a protruding obstacle when the vehicle height is low. Reference numeral 50 is a fuel supply port, and 51 is an air vent pipe.

18, FIG. 19, and FIG. 20 show a method of mounting the over-fender 80 that can be extended to the outside of the normal fender F. When the vehicle height of the rear wheel 11 is adjusted as in the vehicle height adjusting device for a traveling vehicle according to the present invention, the state of the rear wheel 11 becomes too close to the ender F when the vehicle height is high. Fender 80
It is necessary to extend from Fender F to the outside. In this structure, a bracket seat 81 is provided below the fan F, and the overfender 80 is fixed to the bracket seat 81 so as to be extendable.

[0033]

Since the present invention is constructed as described above, it has the following effects. According to the first aspect of the invention, when adjusting the vehicle height of the front wheels, the immovable members are inserted and fixed in the front and rear so as not to move the front wheels.
Next, the power from the engine E is transmitted from the front axle shaft 18 to the rotating gear 15 so that the rotating gear 15 rides on the axle gear 8 to adjust upward movement. Therefore, it is necessary to fix the front wheels first, and since the driving of the rear wheels interferes with the adjusting operation, it is necessary to provide the rear wheel clutch to stop the driving of the rear wheels. Further, in adjusting the rear wheels, it is naturally necessary to stop the driving of the front wheels, fix the rear wheels so that they cannot move, and operate the rotating gear 44 to ride on the axle gear 2 by the driving force of the engine E. is there.

Therefore, it was necessary to fix the front wheel 1 and the rear wheel 11 so as to be immovable each time. In the case of the present invention, the switching lever 14 is in the front mechanism lock state. After that, remove the fixing bolts of the rear wheel axle case 3 and the front wheel axle case 4 and put the aircraft in the engine E
The forward drive force of the rear wheels causes the vehicle body to slightly move forward, and the forward force forcibly rotates the front wheels 1 to rotate the axle gears 8. When the front wheel axle case 4 is swung up to 15 and the front wheel axle case 4 is rotated upward, and the vehicle body is further advanced by the driving force of the rear wheel 11, the front wheel 1 is prevented from further rotation by the stopper. Then, the rear wheel 11 becomes immovable, and this time, the rotating gear 44 rides on the axle gear 2, the rear wheel axle case 3 rotates, and the rear wheel is raised.

As described above, the front wheels 1 do not need to be immovable, and the rear wheels 11 are immovable because the front wheels 1 cannot rotate any more. Therefore, in this state, the rotating gear 44 moves the axles. By riding on the gear 2, the rear wheel axle case 3 starts to rotate, and the rear wheel 11 rises. Therefore, unlike the prior art, a mechanism for disconnecting the drive of the rear wheels in the drive state of the front wheels is unnecessary. Further, it is not necessary to make the front wheel 1 and the rear wheel 11 immovable when adjusting the vehicle height.

Since the switching between the four-wheel drive mode, the two-wheel drive mode and the vehicle height control mode is performed by the single switching lever 14, the four-wheel drive mode and the two-wheel drive mode switching lever 14 are used in the case of a normal tractor. It is also a necessary lever, which is also used,
Since it can also be used as a vehicle height adjusting lever, the cost does not increase even though the vehicle height adjusting device for the traveling vehicle is configured. Further, a switching lever 14 for four-wheel drive and two-wheel drive is conventionally arranged, and it is difficult to provide another lever at this portion. However, by using the same lever, there is no complication of the lever. .

Since the detent mechanism for temporarily stopping the rear wheel axle case 3 in the raised position is provided as in the third aspect, the fixing bolt is quickly moved to the high position when the vehicle height of the rear wheel 11 is increased. It is necessary to screw the fixing portion 34, but at this time, since the detent mechanism D can temporarily hold the raised position, the aircraft does not suddenly descend and cause a personal injury to the operator. is there. Further, when the detent mechanism D is engaged when the rear wheel 11 is in the raised state, the front wheel 1 is also in the raised state, and therefore the detent mechanism D that prevents both the front wheel 1 and the rear wheel 11 from descending.
Acts as. Therefore, it is no longer necessary to provide a detent mechanism for the front wheels only.

[Brief description of drawings]

FIG. 1 is a side view of a tractor in which a vehicle height is reduced by a vehicle height adjusting device for a traveling vehicle according to the present invention.

FIG. 2 is a side view of the tractor with the vehicle height also increased.

FIG. 3 is a cross-sectional view of a mission case M portion of the vehicle.

FIG. 4 is an enlarged side sectional view of a front wheel speed increasing mechanism and a front wheel lock mechanism portion.

FIG. 5 is a view of a switching lever 14 arranged on a side surface of a clutch housing H portion.

FIG. 6 is a cross-sectional view and a side view of the rear wheel axle case 3 and the rear axle shaft 31 in a state where the vehicle height of the rear wheel 11 is lowered.

FIG. 7 is a sectional view and a side view of the rear wheel axle case 3 and the rear axle shaft 31 in a state where the vehicle height of the rear wheel 11 is also increased.

8 is a rear cross-sectional view of a fixed portion between the rear wheel axle case 3 and the rear axle case 10. FIG.

9 is a side view of the rear axle case 3 and the rear axle case 10. FIG.

FIG. 10 is a sectional view of a detent mechanism of a rear wheel 11.

FIG. 11 is a rear cross-sectional view and a side view in which the vehicle height of the front wheels 1 is lowered.

FIG. 12 is a rear cross-sectional view and a side view showing a state where the vehicle height of the front wheels 1 is also increased.

FIG. 13 is a view showing another embodiment of the front wheel axle case 4.

FIG. 14 is a cross-sectional view of an embodiment in which a blocking oil seal 70 is interposed between a fixed side bevel gear box 61 and a rotating side bevel gear box 62.

FIG. 15 is an enlarged sectional view of a portion of the cutoff oil seal 70 of the same.

FIG. 16 is a side view showing the arrangement of a fuel tank T.

FIG. 17 is a front view showing the disposition of the fuel tank T as well.

18 is a side view of Fender F. FIG.

19 is a plan view of Fender F. FIG.

FIG. 20 is a cross-sectional view of Fender F.

[Explanation of symbols]

 1 front wheel 2 rear axle axle gear 3 rear wheel axle case 4 front wheel axle case 5 front wheel adjustment pivot axis 6 front axle 7 rear axle 8 front axle axle gear 9 front wheel drive axle

Claims (3)

[Claims] 1. A front wheel axle case (4) that rotates around an adjustment rotation axis (5) and a rotation gear (15) fixedly mounted on the adjustment rotation axis (5), revolves around the front wheel axle case (4) while revolving. An axle gear 8 is provided, the axle gear 8 is fixed to the front axle 6 pivotally supported by the front wheel axle case 4, the front wheel 1 is fixed to the front axle 6, and the front axle shaft 18 is non-rotatable. In a state where the rotation from the front axle shaft 18 to the adjustment rotation shaft 5 is disabled, the vehicle body is moved forward by the rear wheel driving force, and the front wheel 1 revolves while rotating, whereby the front wheel axle case 4 is adjusted and rotated. Rotate around axis 5,
A rear wheel axle case 3 that allows the vehicle height of the front wheels 1 to rise and rotates around a rear axle shaft 31, and the rear axle shaft 3
1 is provided with an axle gear 2 that revolves around the rotating gear 44 fixed to 1 and revolves around the rear wheel axle case 3, and the axle gear 2 is fixed to the rear axle 7 that is pivotally supported by the rear wheel axle case 3.
The rear wheel 11 fixed to the rear axle 7 cannot be moved back and forth,
By driving the rear axle shaft 31 by the engine, the rear wheel axle case 3 rotates around the rear axle 7 by the driving force, and the vehicle height of the rear wheel 11 can be increased. Vehicle height adjustment device. 2. The vehicle height adjusting device for a traveling vehicle according to claim 1, wherein switching between four-wheel drive, two-wheel drive, and vehicle height adjustment is configured by a single switching lever 14. High adjustment device. 3. The vehicle height adjusting device for a traveling vehicle according to claim 1, further comprising a detent mechanism for temporarily stopping the rear wheel axle case 3 at the raised position. Adjustment device.