JP2005194845A - Loader working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a front loader capable of increasing the largest carrying load of a bucket when the loader working vehicle is miniaturized. <P>SOLUTION: The lower end part of a pair of support brackets 22 formed in a substantially protruded shaped form is fitted to the rear part of the traveling part 3 of a small-sized vehicle 1 and the front end of the support bracket 22 is fixed to the front side part of the body 2 of the small-sized vehicle 1. The front loader 19 is fitted to the upper part of the support bracket 22 extended in the right and left sides of the rear upper part of the small-sized vehicle 1. Thereby, the bucket 21 is arranged in the front vicinity position of the small-sized vehicle 1 and even if a heavy material is uplifted, the movement of the gravity center of the loader working vehicle becomes small, and the load of the heavy material is dispersed to the front side and the rear side by the support bracket 22 and does not act partly, therefor, even if the loader working vehicle is made small-sized, the largest loading weight of the bucket 21 can be enlarged. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a loader working vehicle in which a front loader is attached to a small vehicle so as to be rotatable about a horizontal axis.

  2. Description of the Related Art Conventionally, as a loader work vehicle used for crop transportation work, leveling / snow removal work, etc., for example, there is one shown in FIG. 3 (see, for example, Patent Document 1). In this loader work vehicle, a front loader 32 is attached to the front side portion of the work vehicle 31 so as to be rotatable about a horizontal axis. The work vehicle 31 is provided with a prime mover section 34 at the upper front side of the body frame 33, a driving operation section 35 is disposed at the upper rear side of the body frame 33, and a pair of left and right crawler-type vehicles is disposed at the lower portion of the body frame 33. A traveling unit 36 is provided. The front loader 32 is provided with a bucket 38 at the tip of the lift arm 37, and the base end of the lift arm 37 is attached to a hitch 40 erected on a pair of left and right hitch stays 39 on the front side of the body frame 33. It is pivotally mounted so that it can rotate up and down. Patent Document 2 discloses a structure in which a front loader is attached to a bracket provided on a wheel-type work vehicle such as a tractor.

  Since the conventional loader work vehicle has the front loader 32 attached to the front side portion of the work vehicle 31, the bucket 38 is separated in front of the work vehicle 31. When the bucket 38 is lifted and lowered at a position away from the work vehicle 31 in this way, the center of gravity of the loader work vehicle moves to the front side by the load of the heavy load loaded on the bucket 38. For this reason, conventionally, the work vehicle 31 has a relatively large overall length so that the loader work vehicle does not become unstable due to the influence of the movement of the center of gravity during the operation of the front loader 32. However, when the work vehicle 31 becomes large, the loader work vehicle becomes difficult to spread to general households due to problems such as storage space for the loader work vehicle and purchase costs. For example, in heavy snowfall areas, ordinary households have heavy work such as snow removal work in the garden, so if problems such as storage space are solved, demand from ordinary households is expected to increase. In consideration of use in ordinary households, it is necessary that even a weak person such as an elderly person or a woman can easily handle it. Under such circumstances, there is a demand for further downsizing the loader work vehicle.

  However, simply reducing the size of the work vehicle 31 to reduce the size of the loader work vehicle tends to be affected by the movement of the center of gravity when the front loader 32 is operated, and becomes unstable. On the other hand, if the maximum load load of the front loader 32 is reduced to suppress the movement of the center of gravity in order to ensure the stability of a small loader work vehicle, the practicality is lowered. Therefore, in order to reduce the size of the loader work vehicle, it is required to increase the maximum load capacity of the front loader 32 as much as possible.

JP 2001-295314 A Japanese Patent Laid-Open No. 8-130917

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a small loader working vehicle having a large maximum load capacity of a front loader.

  The loader working vehicle according to the present invention has a front loader in which a bucket is disposed at the tip of a lift arm formed at substantially the same length as the full length of the small vehicle at the rear upper part of the small vehicle. A pair of support brackets for attaching the front loader to a small vehicle are formed in a substantially toroidal shape, and a lower end portion of each support bracket is attached to a rear portion of the traveling portion of the small vehicle and The front end of the support bracket is fixed to the front side of the body of the small vehicle, and the base end of the front loader is attached to the top of the support bracket that extends to the side of the rear upper portion of the small vehicle. It is said.

  As described above, the present invention attaches the base end portion of the lift arm formed substantially the same as the total length of the small vehicle to the upper portions of the support brackets extending to the left and right sides of the rear upper portion of the small vehicle. The bucket moves up and down at a position close to the front of the small vehicle. Thus, when the raising / lowering position of the bucket is brought close to the work machine main body, the front / rear balance of the loader working vehicle can be optimally configured even when the front loader is attached to the small vehicle, and the damping clearance of the bucket can be sufficiently secured. . Further, even when a heavy object is loaded on the bucket, the center of gravity of the loader work vehicle hardly moves, and stability is improved. Furthermore, the load of the heavy object loaded on the bucket is distributed to the rear part of the traveling part of the small vehicle and the side part of the body via the support bracket, and is not locally applied to the rear upper part of the small vehicle. Accordingly, the maximum load load of the front loader can be increased as much as possible while reducing the size of the loader work vehicle.

  In addition, when the traveling portion has a pair of left and right crawlers provided with a slide mechanism for approaching and separating the rear wheel from the front wheel, the lower end portion of each support bracket is formed in a substantially U-shape and is substantially U-shaped. The crawler is fitted to the rear wheel axle with the opening side of the crawler facing in the horizontal direction. Since the endless belt part stretches over time and the crawler creates a gap between the front and rear wheels, the crawler prevents the endless belt part from loosening by providing a slide mechanism that moves the front and rear wheels closer to and away from each other. To do. In particular, in the case of a slide mechanism that moves the rear wheel closer to and away from the front wheel, the lower end portion of each support bracket is formed in a substantially U shape and the opening side of the substantially U shape is directed in the horizontal direction. When the endless belt portion of the crawler is extended, the rear wheel can be separated from the front wheel without changing the position of the support bracket when the endless belt portion of the crawler extends. Accordingly, the support bracket can apply a load to the rear wheel axle even when the rear wheel of the crawler is slid.

  The loader working vehicle according to the present invention is characterized in that, in a loader working vehicle in which a front loader is attached to a small vehicle so as to be rotatable about a horizontal axis, a step for standing is provided at a rear portion of the small vehicle.

  When the standing step is provided at the rear part of the small vehicle in this way, the standing step and the operator who gets on the standing step become weights and can balance the heavy load loaded on the bucket. . As a result, the loader working vehicle can be downsized while increasing the maximum load capacity of the bucket. Furthermore, when the driver stands on the standing step, the visibility in front of the loader work vehicle is improved.

  In addition, if the stand-up step is configured to be foldable, the loader work vehicle can be switched between the riding type and the hand-held type, and the stand-up step can be folded to make it more compact and space efficient during storage. Will improve.

  Furthermore, if a standing assistance pipe is installed at the rear of the standing step, the operator is not sandwiched between an obstacle such as a rear wall and the loader working vehicle when the loader working vehicle moves backward.

  According to the present invention, the loader work vehicle has a good balance between the front and rear, and the center of gravity of the loader work vehicle hardly moves even when a heavy object is loaded on the bucket. Furthermore, the load of the heavy object loaded on the bucket is distributed to the rear part of the traveling part of the small vehicle and the side part of the body via the support bracket, and is not locally applied to the rear upper part of the small vehicle. Therefore, the maximum load capacity of the front loader attached to the small vehicle can be increased.

  In addition, a stand-up step provided at the rear of a small vehicle and a driver who rides on the stand-up step serve as a weight to balance the heavy load loaded on the bucket. However, the maximum load capacity of the bucket can be increased.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 illustrates a loader work vehicle according to the present invention. In the figure, reference numeral 1 denotes a small vehicle, which is a small vehicle in which a crawler type traveling unit 3 slightly larger than the prime mover is disposed under a body 2 in which a prime mover (not shown) is stored. The crawler type traveling unit 3 includes a slide mechanism 6 between a driving-side front wheel 4 and a driven-side rear wheel 5. The slide mechanism 6 pivotally supports the axle 7 of the front wheel 4 and extends to the rear wheel 5 side, and the hollow cylinder portion 8 that supports the axle 9 of the rear wheel 5 and extends to the front wheel 4 side. The rod portion 10 is configured to be telescopically telescopic, and an adjustment bolt 13 is screwed into female screw portions 11 and 12 provided on the cylinder portion 8 and the upper portion of the rod portion 10. The crawler-type traveling unit 3 allows the rear wheel 5 to be separated from the front wheel 4 by the adjusting bolt 13 even if the endless belt portion 14 wound around the front wheel 4 and the rear wheel 5 extends due to use over time. The endless belt portion 14 is not loosened.

  In addition, the step 15 for standing riding is attached to the rear lower part of the small vehicle 1 so that folding is possible. A standing-on assist pipe 16 formed in a substantially T-shape is erected at the rear end portion of the standing-on step 15. The standing ride assist pipe 16 is for preventing the operator from being caught between the rear wall and the loader work vehicle when the loader work vehicle is moved backward. A handle 17 and an operation lever 18 are provided on the upper rear side of the small vehicle 1.

  Further, in FIG. 1, reference numeral 19 denotes a front loader, which is provided with a bucket 21 at the tip of a lift arm 20 formed to be approximately the same length as the small vehicle 1, and a support bracket 22 erected on the rear side of the small vehicle 1. A base end portion of the lift arm 20 is attached to the upper portion of the lift arm 20 so as to be rotatable about a horizontal axis. The lift arm 20 is rotated in the vertical direction by an arm cylinder 23 disposed between an intermediate portion thereof and a substantially central portion of the support bracket 22. The bucket 21 can be raised and lowered by a bucket cylinder 24 disposed between the rear portion and the upper portion of the support bracket 22.

  2A is a side view of the support bracket 22, and FIG. 2B is a rear view of the support bracket 22. As shown in FIG. 2A, the support bracket 22 has a side plate 22b extending forward from the lower portion of the mounting portion 22a of the front loader 19 and the lower portion of the mounting portion 22a of the front loader 19 inward and downward. An attachment portion 22c is provided and is formed in a substantially toroidal shape when viewed from the side. The mounting portion 22a of the front loader 19 or the like is provided with pivoting portions 22d, 22e, and 22f for mounting the base ends of the lift arm 20, bucket cylinder 24, and arm cylinder 23. Screw holes 22g, 22g,... For screwing to the front inner portion of the body 2 of the small vehicle 1 are formed at the front end of the side plate 22b. A fitting portion 22h formed in a substantially U-shape is provided at the lower end of the attachment portion 22c of the traveling portion 3, and the rear wheel of the crawler traveling portion 3 with the opening side of the fitting portion 22h facing forward. 5 is fitted on the axle 9. Further, as shown in FIG. 2 (b), the attachment portion 22 c of the traveling portion 3 has a connecting portion 22 i interposed between the attachment portion 22 a of the front loader 19 and the fitting portion 22 h extends inside the traveling portion 3. I'm allowed. As shown in FIG. 2 (b), the mounting portions 22a and 22c of the support bracket 22 are formed in steps by the connecting portions 22i, and even if the mounting portion 22c of the traveling portion 3 is arranged inside the traveling portion 3, the front portion A mounting portion 22a of the loader 22a extends to the side of the rear upper portion of the small vehicle 1.

  In the loader working vehicle of the present invention, as described above, the base end portion of the lift arm 20 formed to be approximately the same as the entire length of the small vehicle 1 is attached to the rear upper portion of the small vehicle 1, and the distal end portion is attached to the small vehicle. 1, the bucket 21 of the front loader 19 moves up and down at the front proximity position of the small vehicle 1. Thereby, the balance between the front and rear of the loader work vehicle can be optimally configured, and even when a heavy object is loaded on the bucket 21, the center of gravity of the loader work vehicle hardly moves, and stability is improved. Further, since the lift arm 20 is sufficiently long, a damping clearance of the bucket 21 can be ensured. Furthermore, the load of the heavy load loaded on the bucket 21 is distributed to the axle 9 of the rear wheel 5 of the crawler type traveling unit 3 and the side of the body 2 via the support bracket 22, and locally on the upper rear side of the small vehicle 1. It doesn't cost. Therefore, the maximum load load of the front loader 19 can be increased as much as possible while reducing the size of the loader work vehicle.

  Further, since a fitting portion 22 a formed in a substantially U shape is formed at the lower end portion of the support bracket 22, and this fitting portion 22 a is fitted to the axle 9 of the rear wheel 5 of the traveling portion 3, the slide mechanism 6 Even if the rear wheel 5 of the traveling unit 3 is shifted in the front-rear direction, the load can be applied to the axle 9 of the rear wheel 5 without changing the position of the support bracket 22.

  Further, since the standing riding step 9 is provided at the lower rear portion of the small vehicle 1 so as to be foldable, when a heavy object is loaded on the bucket 21, the operator who gets on the standing riding step 9 acts as a weight. And balance. In addition, the loader working vehicle can be switched between the riding type and the hand-held type by unfolding or folding the standing step 9, and when the loader working vehicle is stored in a garage or the like, the standing step 9 can be folded. It can be folded and compact to improve space efficiency during storage.

  Although one embodiment of the loader working vehicle according to the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made. When the slide mechanism 6 for moving the rear wheel 5 close and away is not provided, the lower end of the support bracket 22 may be formed in an arbitrary shape other than the U-shape and attached to the axle 9 of the rear wheel 5. Further, the lower end portion of the support bracket 22 is not limited to the axle 9 of the crawler type traveling unit 3, and may be attached to the rear portion of the chassis frame of the traveling unit 3.

  Moreover, although the structure which attaches the front loader 19 to the small vehicle 1 which has the crawler type traveling part 3 was demonstrated in the said embodiment, this invention is applicable also to the small vehicle which has a wheel type traveling part.

It is a side view of the loader work vehicle of the present invention. (A) is a side view of the support bracket, and (b) is a rear view of the support bracket. It is a side view which illustrates the conventional loader work vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Small vehicle 2 Body 3 Traveling part 5 Rear wheel 6 Slide mechanism 7, 9 Axle 15 Step for standing 16 Standing assistance pipe 19 Front loader 20 Lift arm 21 Bucket 22 Support bracket

Claims (5)

  In a loader working vehicle in which a front loader in which a bucket is disposed at the tip of a lift arm formed substantially the same length as the full length of the small vehicle is attached to the rear upper part of the small vehicle so as to be rotatable about a horizontal axis. A pair of support brackets for attaching the front loader to a small vehicle are formed in a substantially toroidal shape, a lower end portion of each support bracket is attached to a rear portion of the traveling portion of the small vehicle, and a front end portion of each support bracket is attached to the small vehicle. A loader working vehicle in which a base end portion of the front loader is attached to an upper portion of a support bracket that is fixed to a front side portion of the body and extends to a side of an upper rear side of the small vehicle.   The traveling portion has a pair of left and right crawlers provided with a slide mechanism for approaching and separating the rear wheel from the front wheel, and the lower end portion of each support bracket is formed in a substantially U-shape and a substantially U-shaped opening. The loader work vehicle according to claim 1, wherein the loader work vehicle is fitted to the rear wheel axle of the crawler with the side facing in a horizontal direction.   A loader working vehicle having a front loader attached to a small vehicle so as to be rotatable about a horizontal axis, wherein a stand-up step is provided at a rear portion of the small vehicle.   The loader work vehicle according to claim 3, wherein the standing riding step is configured to be foldable. The loader work vehicle according to claim 3 or 4, wherein a stand-up assist pipe is erected at a rear portion of the stand-up step.