JPH0815849B2 - Vehicle height adjustment device for traveling vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention is intended to expand the usage of a traveling vehicle such as a tractor by changing the vehicle height of the machine body.

(B) Conventional Technology Conventionally, a technology for changing the vehicle height of a traveling vehicle such as a tractor has been known. However, in the conventional vehicle height adjusting device, the fixed state between the rear axle housing and the final deceleration case is completely removed, and the crane or lift is used to lift the machine body to adjust the vehicle height. The vehicle height could only be adjusted at a maintenance shop with sufficient facilities.

(C) Problems to be Solved by the Invention The vehicle height adjusting device of the present invention enables the vehicle height to be adjusted without the need for a crane, a lift, etc. as in the conventional art, and requires only one operator to operate manually. It is configured so that the vehicle height can be adjusted without depending on.

For this reason, when increasing the vehicle height, use the engine drive force of the tractor to replace the crane and forcefully raise it.When lowering the vehicle height, lower it by the weight of the machine. It is possible to adjust.

(D) Means for Solving the Problems The object of the present invention is as described above, and a configuration for achieving the object will be described below.

A rotating inner cylinder 3a protruding toward the rear axle case 12 side from the final reduction case 3 is loosely fitted to the inner wall portion of the rear axle housing 4 bearing the rear axle shaft 7 inside and is rotated in the rear axle housing 4. By rotating the inner cylinder 3a, the final deceleration case 3 can be rotated, and the axle 2 is bearing-supported in parallel with a position eccentric to the rear axle shaft 7 of the final deceleration case 3, and the rear axle shaft 7 is supported. By rotating the rear axle shaft 7 by the running drive force of the engine while the wheels are grounded, the rotation gear 6 at the tip of the vehicle is meshed with the axle gear 5 on the outer circumference of the axle 2. The rotating gear 6 revolves around its own axis while rotating, and the final deceleration case 3 is rotated with respect to the rear axle housing 4.
In the configuration in which the vehicle height can be adjusted by moving the position of up and down, a rotation locking groove 3c is bored on the circumference of the rotation inner cylinder 3a, and the tip is engaged with the rotation locking groove 3c. The rotation locking pin 15 that prevents the rotation inner cylinder 3a from coming off the rear axle housing 4.
Is inserted from the rear axle housing 4 side.

In addition, the rear axle housing 4 and the final deceleration case 3
The lowering lock pin 8 is provided to prevent the final deceleration case 3 from rotating in a direction in which the vehicle height decreases from the state in which the vehicle height is high in the rotation for adjusting the vehicle height.

In addition, the rear axle housing 4 and the final deceleration case 3
The upper limit stopper 18 and the lower limit stopper 28 are arranged at the turning end position of the final deceleration case 3 in the turning portion of the above.

In addition, the rear axle housing 4 and the final deceleration case 3
A rust preventive shim 10 for preventing rusting between the two is interposed at the rotating and sliding contact part of.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the accompanying drawings will be described.

Figure 1 is a rear view of the tractor with the vehicle height raised,
FIG. 2 is a rear view of the tractor with the vehicle height lowered.

Since the tractor mounts various work machines to the work machine mounting devices provided in the respective parts to perform agricultural work, it is necessary to be able to change the vehicle height to match the work.

For example, as in the case of FIG. 1, it is necessary to increase the vehicle height when performing work while straddling the ridge-grown and growing crops, and as in the orchard of FIG. In places with low hanging branches, it is necessary to lower the vehicle height so that the operator does not come into contact with the fruit trees while traveling.

In the present invention, the vertical adjustment of the vehicle height can be adjusted by vertically moving the axle positions of the front wheels and the rear wheels with respect to the body.

1L and 1R are rear wheels, 4 is a rear axle housing, 12 is a rear axle case, and 14 is a fender.

In order to adjust the vehicle height up and down, it is naturally necessary to move both the front and rear wheels up and down, but the present invention particularly relates to the rear wheel up and down adjustment structure.

FIG. 3 is a front sectional view of a vehicle height adjusting device portion formed in the rear axle housing portion of the tractor, FIG. 4 is a side view seen from the final deceleration case 3 portion in a state where the vehicle height is increased, and FIG. 5 is the same. FIG. 6 is a side view of the rear axle housing 4 side, FIG. 6 is a front cross-sectional view showing the support portion of the lowering lock pin 8, FIG. 7 is a side view of the antirust shim 10, and FIG. 8 is the antirust shim 10.
FIG.

 The vehicle height adjusting device for the rear wheel 1 of FIG. 3 will be described.

On the left and right sides of the rear axle case 12 of the tractor,
The rear wheel height adjusting device of the present invention is arranged and configured. A rear axle housing 4 is fixedly provided on a side surface of the rear axle case 12, and a brake case is formed on a joint surface between the rear axle case 12 and the rear axle housing 4 to arrange a disc brake device. A differential gear device D is arranged inside the rear axle case 12, and in FIG. 3, a portion of the differential gear device D of the differential gear device D is shown.

The rear axle shaft 7 spline-fitted to the differential side gear 34 of the differential gear device D is fitted from the inside of the rear axle housing 4 to the inside of the final reduction gear case 3. The disc brake device is engaged with the portion of the rear axle shaft 7 that extends from the rear axle case 12. The disc brake device is a brake friction plate.
22, the brake cam disc 35, and the cam ball 11. The rotation of the brake arm 13 causes the arm shaft 21 to rotate, and the brake cam disc 35 is rotated via a link, whereby the cam ball 11 is pushed out. Then, the brake friction plate 22 is pressed to brake.

The final deceleration case 3 is composed of a rotating inner cylinder 3a, a case lid 3b, and a main body of the final deceleration case 3, and the rear axle shaft 7 and the axle 2 are provided in the case formed of the case main body and the case lid 3b. Bearings are supported, and a rotating gear 6 is fixedly mounted on the rear axle shaft 7, and an axle gear 5 is fixedly mounted on the axle 2.

The essential part of the present invention is that the turning inner cylinder 3a protruding from the final deceleration case 3 to the rear axle case 12 side is fitted inside the rear axle housing 4 so as to be turnable inside the rear axle housing 4. In the supported state, the final deceleration case 3 can be rotated up and down.

Rear axle housing 4 has a rear axle case
The brake case 4e is formed on the 12 side, and the opposite end is formed of the final deceleration case 3 and the fixed flange portion 4a. In the case of normal work, the fixed flange portion 4a is fixed to the inner surface of the final deceleration case 3 by screwing rotary fixing bolts 16 and 17.

Then, only when the position of the axle 2 is moved up and down with respect to the vehicle body for adjusting the vehicle height, the rotation fixing bolts 16 and 17 are removed, and the final deceleration case 3 is rotated with respect to the rear axle housing 4. To do.

Even when the rotation fixing bolts 16 and 17 are removed, the rotation inner cylinder 3
In order to prevent the a and the rear axle housing 4 from coming off, a rotation locking groove 3c is provided on the outer periphery of the rotation inner cylinder 3a,
A pin portion at the tip of the rotary locking pin 15 is fitted into the rotary locking groove 3c from the rear axle housing 4 side.

In FIG. 3, the axle 2 is at a low position and the vehicle height is high.

When the vehicle height is to be lowered from this state, by removing the rotation fixing bolts 16 and 17, the space between the final deceleration case 3 and the fixed flange portion 4a slides, and the final deceleration case 3 moves to the rear axle. The axle 2 rotates around the shaft 7, and the axle 2 comes to a position above the rear axle shaft 7.

However, when the rotation fixing bolts 16 and 17 are removed, the final deceleration case 3 is immediately rotated due to the weight of the tractor, and the operator's hand or fingers who are trying to remove the rotation fixing bolts 16 and 17 Therefore, the descending lock pin 8 is supported on the front surface of the rear axle housing 4 so that the axle 2 does not immediately descend even if the rotary fixing bolts 16 and 17 are removed.

The structure of the descending lock pin 8 will be described with reference to the drawing of FIG.

A supporting case 4h for the descending lock pin 8 is bored on the front surface of the outer shape of the rear axle housing 4, and the descending lock pin 8 oriented in the left-right direction is slidable in the hole bored in the supporting case 4h. It is supported. The downward lock pin 8 is constantly urged in the lock direction by the urging spring 20. The descending lock pin 8 is engaged
As shown in FIG. 4, this is the engaging recess 3f of the final deceleration case 3. Therefore, the lowering lock pin 8 is always arranged so as to project from the fixed flange portion 4a of the rear axle housing 4 toward the engaging recess 3f of the final reduction gear case 3 which is vertically rotated to adjust the vehicle height. However, even if the operator pulls out the rotation fixing bolts 16 and 17 to adjust the vehicle height, since the descending lock pin 8 is still engaged with the engaging recess 3f, the final deceleration case 3 changes the vehicle height. It does not rub in the direction of lowering.

In order to release the locked state of the descending lock pin 8, the lock release wire 38 for operating the shifter 27, the lever 26 and the arm 25 is arranged at the front part of the operator's driver's seat. To operate the lock release arm to push the lowering lock pin 8 back against the biasing spring 20.
It is necessary to release the engagement state between the final deceleration case 3 and the rear axle housing 4. In this case, since the operator needs to move away from the portion of the vehicle height adjusting device, an accident due to the rapid lowering of the portion does not occur.

 Next, FIGS. 4 and 5 will be described.

The fixed flange 4a portion of the rear axle housing 4 is provided at two locations, namely, when the vehicle height is low as indicated by the solid line in FIG. 4 and when the vehicle height is high as indicated by the position 3'in the chain line. Since it is necessary to fix the housing 4, the protruding fixing surfaces 4b, 4f for fixing with the final deceleration case 3
Is protruding like two corners.

The rotation fixing bolt 1 is attached to the protruding fixing surfaces 4b and 4f.
Six fitting holes 4d are provided. A fitting hole 4c for the rotary fixing bolt 17 is formed at a position opposite to the protruding fixing surfaces 4b, 4f by 180 degrees.

When the vehicle height is lowered from the position where the rotation fixing bolts 16 and 17 are screwed at the high vehicle height position in FIG. 4, the fitting holes 4c and 4 are inserted.
It is inserted in d. There is a problem in that muddy water or the like enters between the final deceleration case 3 and the fixed flange portion 4a and rusts during long-term storage, and the final deceleration case 3 cannot rotate due to rust during the next use. Prevent rust shim 10 between the final deceleration case 3 and the fixed flange 4a so that it will not occur.
Is installed.

Regarding the structure of the anticorrosion shim 10, as shown in FIGS. 7 and 8, the fitting holes 10b and 10c of the rotary fixing bolts 16 and 17 are opened, and the final deceleration case 3 is rotated along with the rotation. In order to enable the above, the engaging piece 10a is formed so as to be engaged with the side surface of the final deceleration case 3.

Further, when the final deceleration case 3 is rotated with respect to the rear axle housing 4 for adjusting the vehicle height, an upper limit stopper 18 and a lower limit stopper 28, which indicate the end position of the vehicle height adjustment rotation, are provided. It is composed of bolts and arranged.
The lower limit stopper 28 is engaged with the engaging recess 3f that engages with the descending lock pin 8 described above, and the upper limit stopper 18 is engaged with the engaging recess 3g of the final deceleration case 3.
Part of. The stoppers 18, 28 and above are constructed so as not to rotate.

(F) Operation of Embodiment The configuration of the present invention is as described above, and the vehicle height adjusting action based on the configuration will be described below.

4 and 5 show a state in which the vehicle height is high, and from this state, the final deceleration case 3 moves to the position 3'to reduce the vehicle height.

In this case, the final deceleration case 3 is rotated by the own weight of the tractor to move the vehicle body to a lower position, so that it is not necessary to use engine power.

In this case, lock the tire so that the rear wheel 1 does not rotate and lock the tire, and brake the brake to prevent the aircraft from moving, and confirm that the descending lock pin 8 is in the locked state. After that, the rotary fixing bolts 16 and 17 fixing the final deceleration case 3 and the fixed flange portion 4a are removed. By removing the rotation fixing bolts 16 and 17, it is possible to rotate the rear axle shaft 7 between the final deceleration case 3 and the fixing flange portion 4a, but it is possible to reduce the vehicle height on the side where the vehicle height is about to decrease. Direction, the lowering lock pin 8 is projected, and the engaging recessed portion 3f of the final deceleration case 3 has the lowering lock pin 8 protruding therefrom.
The final deceleration case 3 does not rotate with respect to the rear axle housing 4 as it is.

After removing the rotation fixing bolts 16 and 17, the operator returns to the seat, operates the lock release wire 38, and pulls down the lowering lock pin 8 against the biasing spring 20. First, the lowering lock pin 8 is locked. Is canceled. Next, when the brake is gradually released to allow the rear axle shaft 7 and the rotary gear 6 to rotate, the rear axle shaft 7 rotates, and the rotary gear 6 rotates around the axle gear 5, The aircraft is descending.

By this operation, when the machine body side is fully lowered, the engagement concave portion 3f contacts the lower limit stopper 28 and further rotation is prevented. At that position, the rotation fixing bolts 16,1
7 is again fitted into the fitting holes 4d and 4c to fix the space between the final reduction gear case 3 and the fixed flange portion 4a.

Next, the case where the vehicle height is increased from the state where the vehicle height is decreased as described above will be described.

In this case, conventionally, after removing the space between the rear axle housing 4 and the final deceleration case 3, the machine is lifted by a crane or a lift, the final deceleration case 3 is rotated downward, and then fixed again to fix the vehicle. Although the height was adjusted, in the present invention, the driving force of the engine of the tractor is used to shift the traveling gear to the creep speed, whereby the aircraft can be lifted by the rotational force of the rear axle shaft 7. It is said that.

Also in this case, the lock body is sandwiched under the tire of the rear wheel 1 to prevent the rear wheel 1 from rotating, the traveling brake is braked, and in the case of the front wheel drive, the front wheel drive clutch is disengaged. The vehicle height adjustment begins. Then, the rotation fixing bolts 16 and 17 are removed, and the final deceleration case 3 and the fixing flange portion 4 are removed.
First, the binding state of a is released. Even as it is, the lower body is more stable and the engagement recess 3f is engaged with the lower limit stopper 28, so that the space between the final deceleration case 3 and the fixed flange portion 4a does not rotate.

Next, the operator sits in the seat, starts the engine, puts the shift lever in the creep shift stage, releases the brake, and gradually joins the main clutch. As a result, the rear axle shaft 7 rotates via the differential gear device D that is differentially locked, and the rotary gear 6 at the tip of the rear axle shaft 7 slowly rotates. In this state, since the rear wheel 1 cannot rotate due to the lock body sandwiched under the tire, the rotation gear 6 revolves around the axle gear 5 while rotating around the axle gear 5, and the rear axle shaft 7 and the fixed flange portion 4a. The part of is lifted against the weight of the aircraft.

Finally, at the position shown in FIG. 4, with the engaging recess 3g in contact with the upper limit stopper 18, the descending lock pin 8 pressed by the biasing spring 20 projects and fits into the engaging recess 3f. They meet.

As a result, the descending lock pin 8 prevents the final deceleration case 3 from descending, so that it is safe and the operator descends from the seat and re-screws the rotation fixing bolts 16 and 17 to the positions shown in FIG.

(G) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, in the case where the final deceleration case 3 and the rear axle housing 4 are rotatably supported in a tubular shape, the rotation locking groove 3c is provided on the rotation inner cylinder 3a side, and the rotation reduction groove 3c is provided from the rear axle housing 4 side. Since the protruding rotation locking pin 15 is fitted,
Even if the rotary fixing bolts 16 and 17 for stopping the final deceleration case 3 and the rear axle housing 4 are removed, the two do not separate from each other, and the vehicle height can be adjusted with the rear wheel 1 grounded.

Secondly, when the vehicle height is reduced with this configuration, if the final deceleration case and the rear axle housing are disengaged from each other, the airframe may suddenly descend and injure the operator.

However, in the present invention, at the position where the operator operates while sitting on the seat, a descending lock pin that can be operated by providing a lock release wire is provided, and after this is removed, the brake is gradually released. By going
Since the vehicle height can be lowered, it is possible to prevent the operator from being injured due to an unexpected lowering of the aircraft. Further, even when the height is increased, the descending lock pin 8 automatically protrudes when it reaches the highest position, so that the descending lock pin 8 is prevented from descending again.
It was possible to prevent the destruction of the machine body and ensure safety without the risk of forced rotation beyond the rotation limit of.

Thirdly, in both cases of height adjustment and in the end of the rotation of the final deceleration case, an upper limit stopper 18 and a lower limit stopper 28 are provided at the end of the rotation of the final deceleration case. As a result, it was possible to prevent the final deceleration case 3 from rotating too much.

Fourthly, if it is left in a retracted state for a long time, the final deceleration case and the rotating surface of the rear axle housing may become rusted. Even when water enters, it does not become unrotatable.

[Brief description of drawings]

1 is a rear view of the tractor with a high vehicle height, FIG. 2 is a rear view of the tractor with a low vehicle height, 3
The figure is a front cross-sectional view of the vehicle height adjustment device that is configured in the rear axle housing of the tractor. Fig. 4 is a side view of the final deceleration case 3 when the vehicle height is high. Fig. 5 is the same rear axle. FIG. 6 is a side view of the housing 4 side, FIG. 6 is a front sectional view showing a support portion of the descending lock pin 8, FIG. 7 is a side view of the antirust shim 10, and FIG. 8 is a plan view of the antirust shim 10. . 1 …… Rear wheel 2 …… Axle 3 …… Final deceleration case 3a …… Rotating inner cylinder 3b …… Case lid 3c …… Rotation locking groove 3f, 3g …… Engagement recess 4 …… Rear axle housing 4a ...... Fixed flange part 4b ...... Projection fixing surface 4c, 4d …… Rotation fixing bolt insertion hole 5 …… Axle gear 6 …… Rotation gear 7 …… Rear axle shaft 8 …… Descent lock pin 16,17 …… Rotation fixing bolt

Claims (4)

[Claims] 1. A final reduction case 3 is provided on an inner wall portion of a rear axle housing 4 bearing a rear axle shaft 7 therein.
The final deceleration case 3 can be rotated by loosely fitting the rotary inner cylinder 3a protruding further toward the rear axle case 12 and rotating the rotary inner cylinder 3a in the rear axle housing 4, thereby making the final deceleration case 3 rotatable. The axle 2 is bearing-supported in parallel with a position eccentric to the rear axle shaft 7 of the rear axle shaft 3, and the rotating gear 6 at the tip of the rear axle shaft 7 and the axle gear 5 on the outer periphery of the axle shaft 2 are meshed with each other to form a wheel. By rotating the rear axle shaft 7 by the running driving force of the engine while it is grounded, the rotating gear 6 revolves around the axle gear 5 while rotating around the axle gear 5, and the final deceleration case 3 with respect to the rear axle housing 4. In the structure in which the vehicle height can be adjusted by rotating and moving the position of the axle 2 up and down, the rotation locking groove 3c is formed on the circumference of the rotation inner cylinder 3a, and the rotation locking groove is formed. Engage the tip with 3c and rotate the inner cylinder 3a to the rear axle housing. The level control system of the traveling vehicle, characterized in that inserted from the rear axle housing 4 side pivot locking pin 15 to prevent the escape from. 2. When rotating the rear axle housing 4 and the final deceleration case 3 according to claim 1 for adjusting the vehicle height, the vehicle height is changed from a high state to a low vehicle height. A vehicle height adjusting device for a traveling vehicle, which is provided with a descending lock pin 8 for preventing the final deceleration case 3 from rotating. 3. An upper limit stopper 18 and a lower limit stopper 28 are provided at the rotation end positions of the final reduction case 3 in the rotation parts of the rear axle housing 4 and the final reduction case 3 according to claim 1. A vehicle height adjusting device for a traveling vehicle, characterized in that 4. A rust preventive shim 10 for preventing rusting between the rear axle housing 4 and the final reduction gear case 3 at the rotary sliding contact portion according to claim 1 is interposed. A vehicle height adjustment device for traveling vehicles.