JPH07180174A - Civil work vehicle - Google Patents

Abstract

PURPOSE:To facilitate a leveling work of ground, by positioning a pair of right and left auxiliary blades at the front side of rear wheels between the front and rear wheels and fitting the blade at almost the same height with the grounding level of both wheels. CONSTITUTION:A pair of right and left auxiliary blades 8 are fitted at a little forward position of the rear wheels 5 in the rear car body 3 so as to be vertically movable with a vertically moving mechanism 9. The auxiliary blades 8 is made to be a little longer than the width of rear wheels 5 and a V-shaped plane and position the outside 8a at the front side and the inside 8 at the rear side and further become diagonal against the right angle of the traveling direction. When leveling the ground, the vertically movable cylinder 12 is extended and the auxiliary blades 8 are lowered to bring the cutter blades 8c to the same level with the face where the front 4 and rear 5 wheels contact the ground. In this state, the blade 6 is moved vertically to cut the rugged surface for levelling. In this case, the rugged face left without cut by the blade 6 is cut by the auxiliary blades 8 to make flat and hence, the rear wheels 5 are not required to travel the rugged face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle in which a work machine such as a blade or a bucket is mounted on a front portion of a vehicle body having front wheels and rear wheels.

[0002]

2. Description of the Related Art As a work vehicle, a tire dozer in which a blade is swingably mounted on a front portion of a vehicle body having front wheels and rear wheels, or a bucket is vertically swung at a front portion of a vehicle body having front wheels and rear wheels. A wheel loader or the like that is freely attached is known, and this tire dozer and wheel loader can perform ground leveling work by running with blades and buckets grounded.

[0003]

With such a working vehicle, as shown in FIG.
As shown in, it is difficult to cut the uneven portion b to be flat at once with the blade a in the case of leveling uneven ground, that is, unevenness, and the uneven portion b remains as a slight unevenness c.

For this reason, the blade a moves up and down together with the vehicle body e when the front wheel d travels through the remaining slight unevenness c after cutting with the blade a, and also when the rear wheel f travels, the blade a together with the vehicle body e. Since a moves up and down, the operator moves the blade a up and down each time to keep the height of the blade a constant and level the ground.

However, as described above, it is very difficult for the operator to vertically move the blade a every time the front wheel d and the rear wheel f run on the unevenness c, and skill is required, and it is practically necessary to level the ground. It is impossible.

Therefore, an object of the present invention is to provide a work vehicle capable of solving the above-mentioned problems.

[0007]

A work vehicle in which a work machine is attached to a front portion of a vehicle body 1 having front wheels 4 and rear wheels 5 so as to project forward from the vehicle body 1 and to be movable up and down. A working vehicle in which a pair of left and right auxiliary blades 8 are positioned in front of the rear wheel 5 between the rear wheel 5 and the rear wheel 5, and the blade portions 8c thereof are arranged at substantially the same height as the ground contact surfaces of the front and rear wheels 4, 5. .

[0008]

[Operation] Since the auxiliary blade 8 can cut the uneven portion that cannot be cut by the working machine during the leveling work, the rear wheel 5 does not run on the remaining uneven portion, so that the vertical displacement of the vehicle body 1, that is, the working machine Since the ground leveling work becomes easier and the left and right auxiliary blades 8 cut only the unevenness of the portion where the rear wheel 5 travels, the cutting force applied to the auxiliary blades 8 is small, and the traveling driving force is not consumed so much. , The cutting force by the working machine is not reduced.

[0009]

2 and 3 show a first embodiment of the present invention, a vehicle body 1 is an articulated type in which a front vehicle body 2 and a rear vehicle body 3 are foldably connected to each other. Two
A front wheel 4 is attached to the rear vehicle body 3, a rear wheel 5 is attached to the rear vehicle body 3, and a working machine, for example, a blade 6 is attached to the front vehicle body 2 so as to be vertically swingable, and the blade 6 and the front vehicle body 2 are extended. A lift cylinder 7 is connected.

A pair of left and right auxiliary blades 8 are vertically movably mounted by a vertically moving mechanism 9 at a position near the front of the rear wheel 5 in the rear vehicle body 3, and the pair of left and right auxiliary blades 8 have a width of the rear wheel 5. The outer portion 8a is oblique to the direction perpendicular to the traveling direction so that the outer portion 8a is in the front and the inner portion 8b is in the rear so that the outer portion 8a is slightly V-shaped in plan view.

In the vertical movement mechanism 9, a cylindrical movable member 11 is vertically movably fitted into a cylindrical fixed member 10, and a vertical rocking cylinder 12 is provided inside the fixed member 10 and the movable member 11.
Are provided and connected to the fixed member 10 and the movable member 11, respectively, and the fixed member 10 is attached to the rear vehicle body 3,
An auxiliary blade 6 is attached to the movable member 11.

Next, the operation will be described. In the case of leveling work, the vertical cylinder 12 is extended and the auxiliary blade 8 is lowered so that the blade portion 8c is at the same height as the ground where the front wheels 4 and the rear wheels 5 are in contact with the ground. While traveling in this state, the blade 6 is moved up and down to cut the unevenness for ground leveling work. At this time, the unevenness remaining without being cut by the blade 6 is cut by the auxiliary blade 8 to be flat. The wheel 5 does not run on the remaining unevenness.

The earth and sand cut by the auxiliary blade 8 are discharged toward the inside of the vehicle body 1 along the auxiliary blade 8 as shown by the arrow in FIG. None, for example, the earth and sand cut by the auxiliary blade 8 at the time of leveling the shoulder portion of the road is not discharged to the shoulder portion.

4 and 5 show a second embodiment, in which a bucket arm 13 is attached to a front vehicle body 2 by a lift cylinder 14 so as to be vertically swingable, and the bucket arm 13 is attached to the bucket arm 13.
5 is attached by a bucket cylinder 16, a lever 17 and a link 18 so as to be tiltable back and forth, and the bucket 15 is used as a working machine. A pair of left and right auxiliary blades 8 move up and down on the front side of the rear wheel 5 of the rear vehicle body 3 in the same manner as described above. The mechanism 9 is attached so that it can move up and down.

6 and 7 show a third embodiment, in which the vehicle body 1 includes a pair of left and right wheel mounting lateral members 21 on both left and right sides of a vehicle body 20.
The front and rear direction intermediate portions of the wheel mounting member 22 are swingably mounted vertically, and the front wheel 4 is mounted near the front portion of the wheel mounting cross member 21 and the rear wheel 5 is mounted near the rear portion thereof. A character-shaped blade support arm 23 and a rear end portion thereof are supported by the vehicle body body 20 so as to be vertically swingable, and a lift cylinder 25 is pivotally connected between the blade support arm 23 and the vehicle body body 20 to form a blade. The blade 6 is attached to the front end of the support arm 23.

Arms 26 having auxiliary blades 8 are mounted on the front side of the rear wheel 5 of each of the wheel cross members 21 so as to be vertically swingable.
The swing cylinder 27 is connected over the range, and when the swing cylinder 27 is expanded and contracted, the auxiliary blade 8 swings up and down.

A longitudinal intermediate portion of an equalizer bar 28 is vertically swingably connected to the vehicle body 20 near the rear wheel thereof, and extends over both longitudinal end portions of the equalizer bar 28 and the left and right wheel mounting cross members 21. When the rod 29 is connected and one wheel mounting cross member 21 swings up and down, the other wheel mounting cross member 21 swings up and down in the opposite direction.

As shown in FIG. 8, the support mechanism 22 is provided between the support shaft 30 provided in the vehicle body 20 and the bearing hole 31 provided in the wheel mounting cross member 21, and between the support shaft 30 and the bearing hole 31. And the wheel mounting cross member 21 is a support shaft 30.
A front traveling motor 33 that drives the front wheels 4 is mounted near the front of the wheel mounting cross member 21, and a traveling motor 34 that drives the rear wheels 5 is mounted near the rear. .

In the above embodiments, the front wheels 4 and the rear wheels 5 are of tire type, but they may be of crawler type.

In each of the above-mentioned embodiments, the auxiliary blade 8 is vertically movable by the vertical movement mechanism 9 and vertically movable by the rocking cylinder 27. The auxiliary blade 8 may be detachably attached to the vehicle body 1 by bolts or the like so as not to get in the way, and may be attached during work and removed during normal work.

[0021]

EFFECTS OF THE INVENTION Since the auxiliary blade 8 can cut the uneven portion left uncut by the working machine during the leveling work, the rear wheel 5 does not run on the remaining uneven portion, so that the vertical displacement of the vehicle body 1, that is, the working machine. This eliminates the problem and facilitates leveling work. Moreover, since the left and right auxiliary blades 8 cut only the unevenness of the portion where the rear wheel 5 travels, the cutting force applied to the auxiliary blades 8 is small and the traveling driving force is not consumed so much, so the cutting force by the working machine is reduced. There is nothing to do.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a conventional defect.

FIG. 2 is a front view showing the first embodiment of the present invention.

FIG. 3 is a plan view of FIG.

FIG. 4 is a front view showing a second embodiment of the present invention.

FIG. 5 is a plan view of FIG.

FIG. 6 is a front view showing a third embodiment of the present invention.

FIG. 7 is a plan view of FIG.

FIG. 8 is an explanatory view of a connecting portion between a vehicle body and a wheel mounting cross member in the third embodiment.

[Explanation of symbols]

1 ... Vehicle body, 4 ... Front wheel, 5 ... Rear wheel, 6 ... Blade, 8 ... Auxiliary blade, 9 ... Vertical movement mechanism.

Claims (4)

[Claims] 1. A working vehicle in which a working machine is mounted on a front portion of a vehicle body 1 having front wheels 4 and rear wheels 5 so as to project forward from the vehicle body 1 and to be movable up and down. A pair of left and right auxiliary blades 8 are located in front of the rear wheel 5, and the blade portions 8c thereof are mounted at substantially the same height as the ground contact surfaces of the front and rear wheels 4, 5, respectively. . 2. The work vehicle according to claim 1, wherein the pair of left and right auxiliary blades 8 are in an oblique posture in which an outer portion 8a is closer to the front and an inner portion 8b is closer to the rear with respect to a direction perpendicular to the vehicle traveling direction. . 3. The work vehicle according to claim 1, wherein the auxiliary blade 8 is attached so as to be vertically movable. 4. The work vehicle according to claim 1, wherein the auxiliary blade 8 is attached and detachably attached.