JP2672983B2 - Height adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a vehicle height adjusting device capable of adjusting vehicle heights of front and rear four wheels by using traveling driving force in a four-wheel traveling vehicle. is there.

(B) Conventional Technology In the related art, in a four-wheel traveling vehicle, a technology that enables the vehicle height to be adjusted by using the traveling driving force of the vehicle has been known.

For example, JP-A-62-273124 and JP-A-62-273127.
It is similar to the technique described in the publication.

(C) Problems to be solved by the invention However, in the conventional technology, when changing from a high vehicle height position to a low vehicle height position, after removing the fixing bolt at the high position, the machine body suddenly moves downward. The stopper pin is locked to prevent it from falling, and when traveling and lowering the aircraft, once run it in the direction that raises the vehicle height, which is the opposite of the moving direction for lowering the aircraft. After removing the stopper, the aircraft was designed to gradually run and lower in the direction of lowering the vehicle height.

Therefore, it is necessary to run the aircraft once in the direction opposite to the direction of lowering the vehicle height to create a space for releasing the stopper, which is difficult for the operator to understand. It was a difficult operation to adjust.

In order to eliminate this inconvenience, the present invention, in a position where the vehicle height is high, applies the weight of the machine body and engages with the stopper on the vertical line OO which is the maximum vehicle height position. Provided at a position beyond the dead point position in the direction of lowering,
When moving the aircraft to the descending side, it is improved so that the state where it is receiving its own weight can be released by exceeding the position of the top dead center of the maximum vehicle height by traveling of the aircraft in the descending direction Is.

(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.

In the configuration in which the wheel-side cases of the front and rear wheels are configured to be rotatable with respect to the vehicle body-side case and the vehicle height is adjusted by individually rotating the differential wheel-side cases by the traveling driving force, the vehicle body weight becomes high at a high vehicle height. The self-weight moment Mo due to is caused to act in the opposite direction to the driving moment Mr by the traveling driving force,
The moment of self-weight Mo due to the body weight of the vehicle body is configured to be received by the stopper recess 4b and the stopper 38 provided between the wheel side case and the vehicle body side case, and when adjusting from a high vehicle height to a low vehicle height, the stopper 38 is The stopper recess 4b is maintained at this position and is configured to move in the direction away from the stopper 38 by the driving force.

(E) Embodiment The purpose and configuration of the present invention are as described above. Next, the configuration of the embodiment shown in the attached drawings will be described.

FIG. 1 is a side view showing a state in which the vehicle height is increased by the forward movement of the aircraft, FIG. 2 is a side view showing a state in which the vehicle height is lowered by the backward movement of the aircraft, and FIG. 3 is a traveling view of the present invention. A skeleton drawing showing the drive system of the vehicle, FIG. 4 is a front view of the front wheels 1, 1 and the front wheel side case 3, and FIG. 5 is a front view of the rear wheels 2, 2 and the rear wheel side case 4. FIG. 6 is a front sectional view of the front wheel side case 3 and the front vehicle body side case 7, FIG. 7 is a side view of the same, and FIG. 8 is a front sectional view of the rear vehicle side case 5 and the rear wheel side case 4. Figures and 9 show front wheel drive lever
FIG. 37 is a sectional view of a portion of a front wheel drive clutch gear 30 operated by 37.

As shown in Fig. 1, it is supported by four wheels of front wheels 1,1 and rear wheels 2,2, and is a fixing bolt for the rotating case of the front wheels 1,1 and rear wheels 2,2 so that the vehicle height can be adjusted. After removing 25, the front wheel drive lever 37 is set to the "brake position" and the main gearshift lever is gradually moved forward at the first forward speed so that the vehicle heights of the rear wheels 2 and 2 become higher first, and then the front wheels 1 and 1 The vehicle height will increase.

Next, set the main gearshift lever to neutral and set the front wheel drive lever 37
When is changed from the "brake position" to the "off" position, the vehicle height adjustment is completed, and by tightening the fixing bolt 25 of the rotating case, the operation for increasing the vehicle height is completed.

Next, when lowering the vehicle height, after removing the fixing bolts of the rotating case for the front wheels 1,1 and the rear wheels 2,2,
When 37 is set to the "brake position" and the main shift lever is set to the first reverse speed and is gradually retracted, the rear wheels 2 and 2 descend first, and then the front wheels 1 and 1 descend.

Next, when the front wheel drive lever 37 is turned off from the "brake position" and the fixing bolt 25 of the turning case is tightened, the operation of lowering the vehicle height ends.

 The power transmission mechanism will be described with reference to FIG.

The power from the engine is transmitted to the rear wheel differential gear device RD via the main transmission device M, the auxiliary transmission device N, and the creep transmission device of the transmission case.

Then, the rear vehicle body side case 5 is configured around a rear differential shaft 24 protruding leftward and rightward from the rear wheel differential gear device RD, and the rear wheel side case 4 is rotatable around the vehicle body side case 5.

Further, a PTO transmission P is configured in parallel with the main transmission M, and the work implement is driven by a PTO shaft projecting rearward from the PTO transmission P.

Further, front wheel drive power is extracted from the front end of the pinion shaft 34 that drives the rear wheel differential gear device RD.

As shown in FIG. 9, the gear at the front end of the pinion shaft 34
33b of the double gears 33a, 33b loosely fitted on the PTO power transmission shaft meshes with 34a.

The other gear 33a has the front wheel drive clutch gear 30
Can be engaged.

The front wheel drive clutch gear 30 is externally connected to the front wheel drive lever 37.
Is configured to be slidable back and forth, and the position of the solid line in FIG. 9 shows the state of "OFF".

Then, when the front wheel drive clutch gear 30 meshes with the gear 33a, the front wheel drive state is set, the position is "OFF" in the position of FIG. 9, and when the front wheel drive lever 37 slides the front wheel drive clutch gear 30 forward, Since the braking piece 30a of the front wheel drive clutch gear 30 meshes with the braking piece 32a of the brake braking body 32 and the braking piece 32a cannot rotate, the front wheel power takeoff shaft 31 is locked in a non-rotatable state.

As shown in FIG. 9, the brake braking body 32 also serves as a bearing lid body of the front wheel power take-out case, has a shearable constricted portion 32b in the middle thereof, and has a braking piece 32a portion. Constitutes a taper portion t, and when a double meshing state occurs due to an erroneous operation, the meshing state is automatically disengaged at the taper portion t, or the brake braking body 32 is released at the constricted portion 32b. It shears and prevents damage to other essential parts.

The braking piece 30a of the front wheel drive clutch gear 30 is replaced with the braking piece 32a.
By engaging with the front wheel, the front wheel is not driven and rotated, and is fixed in a braked state.

On the other hand, when the rear wheels are driven, the front wheels 1 and 1 cannot travel forward with the braking applied, so that the rear wheel side case 4 is moved in the direction in which the height of the rear wheels 2 and 2 becomes higher. It rotates around the case 5 and rises. At that time, the rear wheels 2, 2 move forward by a distance commensurate with the rise of the rear wheels 2, 2.

When the rotation of the rear wheel side case 4 around the rear vehicle body side case 5 is stopped while the vehicle height of the rear wheels 2 and 2 is fully increased, the entire body is moved forward by the rotation of the rear wheels. Since the front wheel power take-off shaft 31 is pressed by the front wheel drive clutch gear 30, the front wheel case 3 of the front wheels 1 and 1 is pushed up by the rear wheels 2 and 2 and the front axle case is pressed. The vehicle starts to rotate around 8, and the vehicle height of the front wheels 1,1 will eventually increase.

When the vehicle height adjustment of the front wheels is completed, the front wheels 1 and 1 will slip and run further, and the rear wheels 2 and 2 will move about 1 to 2 m by this time. .

Next, a drive system for the front wheels will be described with reference to FIGS.

The power of the front wheel power take-out shaft 31 is transmitted to the front wheel differential gear device FD via a joint shaft, and the front wheel speed-up mechanism U is configured on the path.

In the front wheel speed increasing mechanism U, the rotational peripheral speed of the front wheel becomes slower than that of the rear wheel at the time of traveling around the end of the sphere, which causes problems such as large turning half-way and scraping soil. It is a mechanism that increases the rotational speed of the front wheels only when turning.

However, when adjusting the vehicle height, the front wheels 1, 1 and the rear wheels 2, 2 need to have the same speed.
Therefore, when the vehicle is turned to the "brake position" in which the vehicle height is adjusted, the front wheel speed increasing lever is configured to return to the normal speed.

Further, a front diff gauge 21 protruding leftward and rightward from the front wheel diff gear device FD penetrates through the front 7 axle case 8 and projects into the fixed side bevel gear case 6, and the bevel gear 20 inside the fixed side bevel gear case 6 is Axis 18
It meshes with the upper bevel gear 19.

The kingpin shaft 18 projects into the front body side case 7, and the bevel gear 17 disposed in the front body side case 7 is connected to the bevel gear 16 on the front rotation center shaft 15 inside the front wheel side case 3. It is in mesh.

With this configuration, the front wheel side case 3 is rotatable with respect to the front vehicle body side case 7 about the front rotation center shaft 15, and the vehicle height of the front wheels 1, 1 is adjusted. .

When adjusting the vehicle height, since the front wheel drive lever 37 engages the front wheel drive clutch gear 30 with the brake braking body 32, the front differential shaft 21 cannot rotate.

Therefore, since the front rotation center shaft 15 cannot rotate, the gear 14 on the front rotation center shaft 15 and the gear 13 on the front wheel 12 also cannot rotate, and the front wheels 1, 1 The stoppers are placed in front and back, and cannot be rotated.

Therefore, even if the fuselage moves forward with the fixing bolt 25 of the wheel-side rotating case loosened, the front wheels 1, 1 cannot rotate, so that the rear wheels 2, 2 are driven as described later, and , 2 rotate and move forward as necessary to ascend the fuselage, push up the fuselage, the rear wheels 2, 2 move forward, and the rear wheel side case 4 moves relative to the rear body side case 5. It rises in the meshing state and raises the vehicle height.

When the vehicle further moves forward, the rear wheel side case 4 cannot rotate any more with respect to the rear vehicle body side case 5, so the rotational force of the rear wheels 2, 2 becomes the forward force of the machine body, and the front wheels 1, 1 and the front axle 12 do not rotate. In this state, the airframe is pushed forward, and the front wheel side case 3, the front rotation center shaft 15, and the gear 14 rotate and rise around the stopped front wheels 1, 1, the front wheels 12, and the gear 13. It becomes a force, and the vehicle height of the front wheels 1 and 1 also increases.

Next, the drive system of the rear wheels 2, 2 will be described with reference to the drawings of FIGS.

The power is transmitted to the rear wheel differential gear device RD by the pinion shaft 34, and the power is transmitted to the rear differential shaft 24 protruding left and right from the rear wheel differential gear device RD.

The rear differential shaft 24 also serves as the central axis of rotation of the rear vehicle body side case 5.

A gear 24 a fixed to the rear differential shaft 24 and a gear 23 fixed to the rear axle 22 mesh with the rear wheel side case 4 to fix the rear wheel side case 4 and the rear body side case 5. When the bolts 25 are loosened, the front wheels 1, 1 are the front wheel drive clutch gear 30 and the brake braking body 32, and if the vehicle is stopped in the vehicle stop state as described above, the rear wheels 2, 2 push up the body. Gear 24a and gear 23
, The rear wheel-side case 4 is rotated with respect to the rear body-side case 5 to raise the vehicle height.

When lowering the vehicle height, by loosening the fixing bolt 25 and moving the vehicle backward, first, the rear wheels 2 and the rear wheel side case 4 gradually rotate and descend, and when this descending ends. ,
Since the entire machine body is moved rearward and the front wheels 1 and 1 are in the car stop state, the front axle case 8 and the front wheel side case 3 are
While rotating, the vehicle height of the front wheels 1,1 is lowered. 35 is a fixed pin of the check chain for the lower link.

FIG. 10 is a side view of the rear body side case 5 and the rear wheel side case 4 into which the fixing bolts 25 are inserted, as viewed from the inside. FIG. 11 is a side view from the inside showing only the high vehicle height. FIG. 12 is a side view of the inside of the rear wheel side case 4, and FIG. 13 is a side view of the rear vehicle body side case 5 from the inside.

As shown in FIG. 13, the rear vehicle body side case 5 constitutes a flange portion of the rear wheel side case 4 and a flange portion which is fixed by a fixing bolt 25 at the outer end portion of the portion where the rear differential shaft 24 is fitted. .

In addition to the check chain fixing pin 35, a hole into which a stopper 38 is screwed is formed on the flange surface.

And the stopper 38 fixed at the high position of the vehicle height
Is placed and the stopper 38 ″ in the middle position of the vehicle height
The low position stopper 38 'is replaceable.

The screwed state of the stopper 38 is also disclosed in FIG.

Further, two fixing bolt insertion holes 5d and 5e for inserting the fixing bolts 25 with the rear wheel side case 4 are opened on the flange surface of the rear vehicle body side case 5.

The rear wheel side case 4 shown in FIG. 12 shows the inside,
The stopper recesses 4b and 4c that engage with the stopper 38 are cut out.

The stopper recess 4b is a stopper recess at high vehicle height, and the stopper recess 4c is a stopper recess at intermediate / low vehicle height.

The rear axle 22 is pivotally supported on the rear wheel side case 4, and the rear axle 22 is pivotally supported at the tenth position.
As shown in FIG. 11 and FIG. 11, at a high vehicle height position, it is arranged at a position inclined by an angle a degrees to the stopper recess 4b side from the position of the vertical line OO.

When the angle a is 0 degree, the own weight applied to the rear axle 22 is applied directly to the rear differential shaft 24 along the perpendicular line OO.

Further, when the angle a is negative and the inclination is toward the stopper recess 4c, the self-weight moment Mo is applied in the direction in which the stopper 38 and the stopper recess 4b are not engaged, so that the rear wheel side case 4 is It turns all at once and descends toward a low vehicle height.

In the present invention, the top dead center formed by the perpendicular line O-O is formed by the angle a degrees so that the dead weight is applied to the engaging portion of the stopper recess 4b and the stopper 38 via the rear wheel side case 4 by the angle a. The rear axle 22 is arranged at a position beyond the side.

As a result, the moment Mo based on its own weight acts so as to be applied to the engaging portion between the stopper 38 and the stopper recess 4b as shown in FIG.

When adjusting from the high position of the vehicle height to the middle or low position of the vehicle height, the rear wheel side case on the right side of the vehicle body causes the driving moment Mr to act by gradually traveling backward of the vehicle body. The stopper recess 4b gradually becomes the stopper.
Since it works against the moment Mo in the direction away from 38, when the driving moment Mr exceeds the own weight moment Mo, the rear wheel side case 4 crosses the perpendicular line OO.

If the position of the rear axle 22 is rotated until it exceeds the top dead center formed by the vertical line OO, the moment Mo is applied in the direction in which the machine body descends, so that it is in the same direction as the machine body driving moment Mr. By gradually moving backward, the vehicle height can be lowered from the middle to low.

Then, when it is desired to adjust the vehicle height to the middle, if it is screwed at the position of the stopper 38 ″, the portion of the stopper recess 4c engages with the stopper 38 ″ and stops.

Further, when it is desired to adjust the position to a low vehicle height, if it is screwed at the position of the stopper 38 ', the stopper recess 4c is engaged and stopped.

It is possible to increase the vehicle height by reversing this operation.

As shown in Fig. 11, at the high vehicle height position, the fixing bolt 25
The positions of the fixing bolt insertion holes 5d and 4d are matched and screwed.

At the position of the intermediate vehicle height, the fixing bolt insertion holes 5d and 4d are aligned with each other, so that the fixing bolt 25 is screwed into this position.

Further, when the vehicle height is low, the fixing bolt 25 can be screwed by matching the fixing bolt insertion holes 5e and 4d.

Therefore, there are two sets of fixing bolt insertion holes 5d and 5e, and two sets of fixing bolt insertion holes 4d and 4C on the rear wheel side case 4, but the fixing bolt insertion holes 5d and 4d are used twice respectively. hand,
It is possible to fix the high, middle and low positions.

In the present embodiment, the vehicle height is increased by moving forward and the vehicle height is decreased by moving backward, but the invention is not limited to this. In addition, stopper 38 and stopper recess 4
Although the configurations of b and 4c are provided on the rear wheels 2, 2 side, it goes without saying that they may be provided on the front wheels 1, 1 side.

Figure 14 shows a muffler that is adjusted up and down as the vehicle height is adjusted.
Side view showing the configuration of 45, FIG. 15 is a plan view of the muffler 45,
16 and 17 are a sectional view and a rear view showing a simple attachment / detachment mechanism of the muffler 45, and FIG. 18 is a side view of a portion of the muffler flange 51.

The exhaust air is guided from the engine E in the bonnet to the muffler flange 51 by the exhaust air guide pipe 50.

When the vehicle height is low, the upper part of the vehicle is open, and the lower part of the frame is low and there is no room. Therefore, it is preferable to arrange the muffler 45 at the upper part like 45 '. In some cases, the upper part may interfere with the branches of trees,
Since there is a margin below the frame, it is better to arrange it like the muffler 45.

Since the vehicle height can be changed with one touch using the vehicle height adjusting device, it is desirable that the muffler 45 can also be changed up and down with one touch.

In this configuration, the metal fittings 47a, 47b and the locking pieces 48a, 48b that allow the muffler 46 and the muffler 45 attached to the muffler flange 51 to be attached and detached with one touch are configured.

The locking metal fittings 47a, 47b are fixedly mounted on the muffler 45 side, and the locking pieces 48a, 48b are fixedly mounted on the base muffler 46 side so that they can be detached with a touch.

The muffler flange 51 is provided with a long hole 51a, and the position of the muffler 45 can be adjusted by rotating the mounting bolt of the base muffler 46 by 90 degrees in the long hole 51a.

(F) Other Embodiments As shown in FIG. 8, in the rotatable insertion portion between the rear vehicle body side case 5 and the rear wheel side case 4, the rear wheel side case 4 is inside the rear vehicle body side case 5. A concave groove is provided on the outer side of the insertion tube 4a portion inserted into the concave groove, and the engaging ball 36 urged by the urging spring 37 is press-fitted into the concave groove. In this way, since the retaining balls 36 and the biasing springs 37 constitute the retaining device in the insertion cylinder 4a of the rear wheel side case 4 and the fitting and inserting portion of the rear vehicle body side case 5, the gap formed between them is reduced. It was possible to eliminate the anxiety that was given to the operator due to the backlash generated by the gap during traveling.

Further, two insertion holes for the fixing bolts 25 for connecting the rear wheel side case 4 and the rear vehicle body side case 5 are provided on the rear vehicle body side case 5 side, that is, fixing bolt insertion holes 5d and 5e. Two sets of fixing bolt insertion holes 4d and 4e are also provided on the case 4 side, and these two sets are combined to screw the fixing bolt 25 at three positions of high vehicle height, intermediate vehicle height, and low vehicle height. They are dressing up.

As a result, the number of bolt insertion holes is reduced, and the positions of the bolt holes are arranged as centrally as possible.
The rear body case 5 can be made compact.

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

As shown in FIG. 1, which is necessary in the prior art,
It is no longer necessary to rotate the wheel case in the direction of increasing the vehicle height to form a gap between the stopper pin and the rear wheel case and then quickly pull out the stopper pin.

In the present invention, the stopper at the high vehicle height position can be fixed, and the stoppers at the intermediate vehicle height and the low vehicle height can be fixed by changing the positions. The action of pulling out is unnecessary.

Secondly, unlike the conventional case, when lowering the vehicle height from a high position, it is not necessary to run the machine body in the opposite direction once to increase the vehicle height to form a gap with the stopper pin. A detecting device for detecting whether or not a gap is formed between the stopper pin and the wheel side case is not necessary.

Thirdly, since the stopper is located at the position where it starts to become lower than the maximum vehicle height, the fixing bolts 25 are all removed to prevent the vehicle from moving even when braking is not applied. This eliminates the danger of the operator descending at once and causing personal injury.

Fourth, after adjusting the vehicle height from low to high, the stopper engaging portion is provided at a position beyond the top dead center, so that it is stable at a high vehicle height, so when the fixing bolt 25 is screwed. At that point, the fear disappeared when the aircraft descended all at once.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which the vehicle height is increased by the forward movement of the aircraft, FIG. 2 is a side view showing a state in which the vehicle height is lowered by the backward movement of the aircraft, and FIG. 3 is a traveling view of the present invention. A skeleton drawing showing the drive system of the vehicle, FIG. 4 is a front view of the front wheels 1, 1 and the front wheel side case 3, and FIG. 5 is a front view of the rear wheels 2, 2 and the rear wheel side case 4. FIG. 6 is a front sectional view of the front wheel side case 3 and the front vehicle body side case 7, FIG. 7 is a side view of the same, and FIG. 8 is a front sectional view of the rear vehicle side case 5 and the rear wheel side case 4. Figures and 9 show front wheel drive lever 37
Is a cross-sectional view of the front wheel drive clutch gear 30 operated by the above, FIG. 10 is a side view of the insertion portion of the fixing bolts 25 of the rear vehicle body side case 5 and the rear wheel side case 4 as seen from the inside, and FIG. 11 is the vehicle height. Side view from the inside showing only the height of the vehicle, FIG. 12 is a side view from the inside of the rear wheel side case 4, FIG. 13 is a side view from the inside of the rear body side case 5, and FIG. A side view showing the structure of the muffler 45 that is adjusted up and down according to the adjustment, FIG. 15 is a plan view of the muffler 45, and FIGS. 16 and 17 are a sectional view and a rear view showing a simple attachment / detachment mechanism of the muffler 45. FIG. 18 is a side view of the muffler flange 51. U …… Front wheel speed-up mechanism Mo …… Moment weight moment Mr …… Drive moment 1 …… Front wheel 2 …… Rear wheel 3 …… Front wheel side case 4 …… Rear wheel side case 5 …… Rear vehicle side case 6 …… Fixed side bevel gear case 7 …… Front body side case 8 …… Front axle case 25 …… Fixing bolt 30 …… Front wheel drive clutch gear 32 …… Brake braking unit 38 …… Stopper

Claims (1)

(57) [Claims] 1. A structure in which a wheel-side case of front and rear wheels is configured to be rotatable with respect to a vehicle-body-side case and the vehicle-side height is adjusted by rotating each wheel-side case by a traveling driving force,
At high vehicle height, the self-weight moment Mo due to the self-weight of the vehicle body acts in the opposite direction to the driving moment Mr due to the driving force, and the self-weight moment Mo due to the self-weight of the vehicle body is provided between the wheel side case and the body side case. Stopper recess 4b
The stopper 38 is configured to be received by the stopper 38, and when adjusting from a high vehicle height to a low vehicle height, the stopper 38 is maintained at the position,
A vehicle height adjusting device characterized in that the stopper concave portion (4b) is configured to move in a direction away from the stopper (38) by a traveling driving force.