JP5313591B2 - Loading device for work vehicle - Google Patents

Description

  The present invention relates to a loading device (loader) that is mounted on a work vehicle and is used for loading work of earth and sand or loose objects.

  Generally, a front loader or the like that is a loading device mounted on a work vehicle includes a pair of left and right lift arms, a bucket attached to the front end thereof, a cylinder for raising and lowering the lift arm, and a cylinder for rotating the bucket (For example, refer to Patent Document 1).

  At the rear end portion of the lift arm arranged in the conventional loading device as described above, the rear end boss member to be pivotally supported by the work vehicle frame is welded. Similarly, at the front end, a front end boss member for pivotally supporting the bucket is welded.

  Hereinafter, the front end boss member will be described with reference to FIG. In addition, about the structure demonstrated below, it is substantially the same also about a rear end side boss | hub member. As shown in FIG. 9, a front end side boss member 91 for pivotally supporting a bucket (not shown) is welded to the front end 171a of the lift arm. A bush hole 91a is opened in the front end side boss member 91, and a bush 96 is fitted into the bush hole 91a by cold fitting. A stopper 35 for restricting the rotation of the bucket is disposed below the front end 171a.

Here, when the bush 96 is inserted into the bush hole 91a of the front end boss member 91, the front end boss member 91 is first welded to the front end 171a, and then the bush 96 is connected to the front end boss member. It is cold-fitted to 91.
JP 2006-257839 A

  However, as described above, when the front end boss member 91 is welded to the front end portion 171a and then the bush 96 is cooled and fitted to the front end side boss member 91, it takes time and effort to mount the bush 96. And cost was high. On the other hand, when the bush 96 is fitted into the front end boss member 91 and then the front end boss member 91 is welded to the front end 171a, the heat in the welded portion in the drawing is applied to the bush 96 through the bush hole 91a. There was a problem that the bush 96 was adversely affected.

The present invention takes the following means in order to solve the above problems.
According to a first aspect of the present invention, the work vehicle loading device includes a work vehicle frame, a lift arm pivotally supported by the work vehicle frame, and a bucket pivotally supported by the lift arm. A front boss member for pivotally supporting the bucket is welded to the front end portion of the lift arm, and the lift arm has a rear end portion for pivotally supporting the work vehicle frame. A rear end side boss member is welded, and a bush hole is eccentrically opened to the front end side which is the anti-lift arm side, and the bush is inserted into the bush hole by a cold fit. The bush is inserted into the bush hole of the boss member, and then the boss member is welded to the lift arm, and the welded portion in the vicinity of the welded portion between the boss member and the lift arm; The Radiating portion constitute the boss member side between the shoe hole, the heat in the welding portion to be transmitted to the bush through the bush hole, the heat radiating unit, in which heat is radiated before it reaches the said bush .

According to a second aspect of the present invention, in the work vehicle loading device according to the first aspect, the heat radiating portion has a heat radiating opening in the vicinity of a welded portion between the boss member and the lift arm. is there.

According to a third aspect of the present invention, in the work vehicle loading device according to the first aspect, the heat radiating portion is provided with a heat radiating notch in the vicinity of the welded portion between the boss member and the lift arm .

According to a fourth aspect of the present invention, in the work vehicle loading device according to the first aspect, the heat radiating portion is configured to form the boss member in a substantially “6” shape in a side view, and a welded portion between the boss member and the lift arm. Is configured in a substantially “L” shape in a side view .

According to the first aspect of the present invention, the work vehicle includes a work vehicle frame, a lift arm pivotally supported by the work vehicle frame, and a bucket pivotally supported by the lift arm. A front end side boss member for pivotally supporting the bucket is welded to a front end portion of the lift arm, and a rear end portion of the lift arm is rotatable to the work vehicle frame. A boss member at the rear end for pivotal support is welded to the boss member, and a bush hole is eccentrically opened at the tip side which is the anti-lift arm side, and the bush is cooled and fitted into the bush hole. In the structure to be inserted, after the bush is inserted into the bush hole of the boss member, the boss member is welded to the lift arm, and in the vicinity of the welded portion between the boss member and the lift arm. The A heat radiating portion is formed on the boss member side between the contact portion and the bush hole, and heat in the welded portion transmitted to the bush through the bush hole is radiated by the heat radiating portion before reaching the bush. Therefore, by the heat radiation provided in the vicinity of the welded portion with the lift arm in the boss member, the heat in the welded portion can be radiated from the heat radiation opening, that is, without transmitting the heat to the bush. Can not adversely affect.
Accordingly, since the bush can be fitted into the boss member before the boss member is welded to the lift arm, the labor and time for mounting the bush can be reduced, and the cost can be reduced.

According to a second aspect of the present invention, in the work vehicle loading device according to the first aspect, the heat radiating portion is disposed in the vicinity of the welded portion between the boss member and the lift arm. Having opened, the boss member, the heat-discharging opening provided in the vicinity of the welded portion of the lift arm, heat can be radiated from the heat radiating opening in the welded portion, that convey heat to the bushing Without adversely affecting the bush.

According to a third aspect of the present invention, in the work vehicle loading device according to the first aspect, the heat radiating portion is provided with a heat radiating notch in the vicinity of the welded portion between the boss member and the lift arm. Therefore, heat in the welded portion can be dissipated from the heat-dissipating cutout portion by the heat-dissipating cutout portion provided in the vicinity of the welded portion with the lift arm in the boss member.

According to a fourth aspect of the present invention, in the work vehicle loading device according to the first aspect, the heat dissipating part is configured so that the boss member has a substantially “6” shape in a side view, and the boss member and the lift. Since the welded portion with the arm is configured in a substantially “L” shape in a side view, the boss member is configured in a substantially “6” shape in a side view, and the welded portion between the boss member and the lift arm is approximately in a side view. By configuring in an “L” shape, heat in the welded portion can be prevented from being transmitted to the bush.

  Next, embodiments of the invention will be described. FIG. 1 is an overall side view of the work vehicle. FIG. 2 is a perspective view of the loader. FIG. 3 is a side view showing a lift arm according to the present invention. FIG. 4 is a side view illustrating the front end portion of the lift arm according to the first embodiment. FIG. 5 is a side view showing the front end portion of the lift arm according to the second embodiment. FIG. 6 is a side view illustrating the front end portion of the lift arm according to the third embodiment. FIG. 7 is a side view showing the front end portion of the lift arm according to the fourth embodiment. FIG. 8 is a side view showing the front end portion of the lift arm according to the fifth embodiment. FIG. 9 is a side view showing a conventional lift arm front end. It should be noted that the technical scope of the present invention is not limited to the following examples, but broadly covers the entire scope of the technical idea that the present invention truly intends, as will be apparent from the matters described in the present specification and drawings. It extends.

  The work vehicle according to the present invention will be described below.

[Configuration of Working Vehicle 1 / Example 1]
As shown in FIG. 1, the work vehicle 1 according to the first embodiment is a tractor loader backhoe, and is equipped with a loader 2 and an excavator 3. A control unit 4 is provided at the center of the work vehicle 1, a loader 2 is disposed in front of the control unit 4, and an excavation device 3 is disposed behind. The work vehicle 1 is equipped with front wheels 8 and 8 and rear wheels 7 and 7, and is configured to be able to travel with the loader 2 and the excavator 3 attached.

  A steering handle 5 and a seat 6 are disposed in the control unit 4, and a traveling operation device and an operation device for the loader 2 are disposed on the side of the seat 6. Thereby, in the control part 4, the steering operation of the work vehicle 1 and the operation of the loader 2 are enabled.

  The excavator 3 is detachably attached to the rear portion of the work vehicle 1, and the excavator 3 is operated by an operating device disposed behind the seat 6. A hydraulic oil tank 90 is disposed on the side of the control unit 4, and the hydraulic oil tank 90 also serves as a staircase for getting on and off the control unit 4. On the opposite side of the control unit 4, A staircase composed of a fuel tank is provided. The hydraulic oil tank 90 is a hydraulic oil reservoir tank.

  A loader 2 as a loading device is connected to a side portion of the work vehicle 1 and extends forward, and a bucket is attached to the tip. An engine is disposed at a front portion of the work vehicle frame 9 that is a chassis of the work vehicle 1, and a bonnet 30 disposed on the work vehicle frame 9 covers the engine. The loader 2 is disposed outside the bonnet 30.

  The loader 2 is attached to the front portion of the work vehicle 1 via a mast portion 9a that forms a part of the work vehicle frame 9, and is used as a front loader. Below the lift arm 171 of the loader 2, a front wheel 8 that is a steered wheel of the work vehicle is disposed. The lift arm 171 is formed so that the front and rear central portions are bent upward from a straight line connecting both ends, and is configured in a “H” shape in a side view. The steering wheel is steered under the lift arm 171. Space to move can be secured.

[Configuration of Loader 2]
Next, the configuration of the loader 2 will be described with reference to FIGS. The loader 2 includes a lift arm 171, a lift arm cylinder 104, a bucket 173, a bucket link 174, an intermediate link 175, a bucket cylinder 105, a first cross member 176, and a second cross member 178.

  The lift arm 171, the lift arm cylinder 104, and the bucket cylinder 105 are pivotally supported at their rear ends by the mast portion 9 a of the work vehicle frame 9. Specifically, the lift arm 171 is pivotally supported by the mast portion 9a via a rear end side boss member 32 welded to the rear end portion 171b.

  The lift arms 171 and 171 are respectively disposed on the left and right of the work vehicle 1. The lift arm 171 extends obliquely downward and forward in the side view of the work vehicle 1 in a side view, bends further downward at the center, and bends forward at the front lower portion, and has a substantially S-shape. ing. A bucket 173 is attached to the tip of the lift arm 171 via an attachment 173b. A bucket cylinder 105 and a bucket link 174 are positioned above the lift arm 171, and an intermediate link 175 is disposed on the lift arm 171 so as to be rotatable in the front-rear direction. A lift arm cylinder 104 is connected to a boss member 34 disposed below the center of the lift arm 171.

  The intermediate link 175 is pivotally supported by a boss member 33 disposed at the front and rear center of the lift arm 171 at the lower end. The upper front portion of the intermediate link 175 pivotally supports the rear end portion of the bucket link 174, and the upper rear portion is pivotally supported by the rod tip of the bucket cylinder 105. The intermediate link 175 includes two substantially triangular plates, and the rear end of the bucket link 174 connected to the intermediate link 175, the bucket cylinder 105, and the lift arm 171 constitute the intermediate link 175. Located between two plates. Further, since the bucket link 174 offset to the lift arm 171 is disposed in the intermediate link 175, the bucket link 174 can be easily offset with respect to the lift arm 171.

  A first cross member 176 and a second cross member 178, which are reinforcing members, are attached between the left and right lift arms 171 and 171 in the left-right direction of the machine body. The first cross member 176 is connected to lift arms 171 and 171 at both ends via bases 176b and 176b. The first cross member 176 and the second cross member 178 are constituted by pipes and are attached to the lift arm 171 by welding. Moreover, in the lift arm 171, the attachment part of the 2nd cross member 178 is comprised wide.

  A reinforcing plate 179 is attached to the center of the outer surface of the lift arm 171 inside the edge. The reinforcing plate 179 is disposed in the lift arm 171 in front of the support portion of the intermediate link 175 and the support portion of the lift arm cylinder 104. The bucket 173 is attached to the attachment 173b on the back surface, and the bucket 173 is configured to be detachable.

  The lift arm 171 is configured to rotate up and down by the lift arm cylinder 104. The bucket 173 is swingably attached to the front end side boss member 31 welded to the front end 171a of the lift arm 171. The bucket 173 is connected to the front end of the bucket link 174 and is configured to be swung by the bucket cylinder 105 via the intermediate link 175.

  The front end 171a of the lift arm 171 is provided with a portion protruding downward, and a stopper 35, which is a contact body for restricting the amount of rotation of the bucket 173 during dumping, is attached to this portion. In other words, the stopper 35 comes into contact with the attachment 173b to restrict the amount of rotation of the bucket 173 during dumping. Thereby, the area which the bucket 173 side and the lift arm 171 side contact at the time of dumping is increased, the surface pressure generated on the contact surface is reduced, and the durability of the loader 2 is improved.

[Configuration of Front End 171a of Lift Arm 171]
Next, the configuration of the front end 171a of the lift arm 171 will be described with reference to FIG. In the present embodiment, a bush hole 31a is eccentrically opened on the front end side (on the side opposite to the lift arm 171) in the front end side boss member 31 disposed on the front end portion 171a of the lift arm 171. A bush 36 is inserted into 31a with a cold fit. The front end boss member 31 is formed in a circular shape when viewed from the side, and a semicircular recess into which the front end boss member 31 can be fitted is formed in the front end 171 a of the lift arm 171. A semicircular welded portion α is formed between the front end 171a of the lift arm 171 and the lift arm 171. The front end boss member 31 in the vicinity of the welded portion α is provided with a heat radiation opening 31b. In other words, a heat release opening 31b having a substantially oval or crescent shape is opened between the bush hole 31a into which the bush 36 is inserted and the welded portion α.

  In this embodiment, as shown in FIG. 3, not only the heat radiating opening 31b is opened in the front end boss member 31, but also the heat radiating opening 32b is formed in the rear end boss member 32. It is similarly opened. The shape of the heat radiation openings 31b and 32b may be any shape that can be opened so as to dissipate heat generated in the welded portion α between the bushing holes 31a. It is not limited.

  By configuring as described above, the bush 36 can be fitted into the front end boss member 31 before the front end boss member 31 is welded to the front end 171 a of the lift arm 171. Specifically, heat at the welded portion α can be radiated in the middle of the front end side boss member 31 by the heat radiating opening 31b provided in the vicinity of the welded portion α of the front end side boss member 31 with the front end portion 171a. That is, it is possible to prevent the bush 36 from being adversely affected without transferring the heat to the bush 36.

  Accordingly, the bush 36 can be fitted and inserted into the front end boss member 31 before the front end boss member 31 is welded to the lift arm 171, thereby reducing labor and time for mounting the bush 36. And cost can be reduced.

[Configuration of Front End 171a of Lift Arm 171 / Example 2]
Next, the configuration of the front end portion 171a of the lift arm 171 according to the second embodiment will be described with reference to FIG. In addition, regarding each embodiment of the front end portion 171a of the lift arm 171 described below, portions common to the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, the front end boss member 41 disposed at the front end 171a of the lift arm 171 has a bush hole 41a that is eccentrically opened to the front end side (the anti-lift arm 171 side). A bush 46 is fitted into 41a with a cold fit. The front end side boss member 41 is formed in a substantially “8” shape in a side view, and a semicircular recess portion into which the front end side boss member 41 can be fitted is formed in the front end portion 171 a of the lift arm 171. On the rear side (lift arm 171 side) of the front end side boss member 41, a heat radiation notch 41b is provided. Between the upper and lower arc portions of the heat radiation notch 41b and the front end 171a of the lift arm 171. Are formed with welds β1 and β2. In other words, a heat radiation notch 41b formed in a substantially U shape in plan view is provided between the bush hole 41a into which the bush 46 is inserted and the welds β1 and β2. .

  By configuring as described above, the bush 46 can be fitted into the front end side boss member 41 before the front end side boss member 41 is welded to the front end portion 171a of the lift arm 171. Specifically, the heat at the welded portions β1 and β2 is dissipated in the middle of the front end side boss member 41 by the heat release notches 41b provided in the vicinity of the welded portions β1 and β2 of the front end side boss member 41 with the front end portion 171a. That is, without transferring the heat to the bushing 46, the bushing 46 can be prevented from being adversely affected.

  Thereby, before the front end side boss member 41 is welded to the lift arm 171, the bush 46 can be fitted into the front end side boss member 41, thereby reducing labor and time for mounting the bush 46. And cost can be reduced.

[Configuration of the Front End 171a of the Lift Arm 171 / Example 3]
Next, the configuration of the front end 171a of the lift arm 171 according to the third embodiment will be described with reference to FIG. In the present embodiment, the front end boss member 51 disposed at the front end 171a of the lift arm 171 has a bush hole 51a that is eccentrically opened toward the front end (on the side opposite to the lift arm 171). A bush 56 is fitted into 51a with a cold fit. The front end side boss member 51 is formed in a substantially oval shape (egg shape), and the front end portion 171a of the lift arm 171 is formed with a semi-oval concave portion into which the front end side boss member 51 can be fitted. . A welded portion γ is formed between the front end portion 171a of the lift arm 171 and the front end side boss member 51, and is formed by extending in a substantially U shape as a heat radiating portion. That is, by forming the front end side boss member 51 in a substantially oval shape, the distance between the welded portion γ and the bush hole 51a is increased while sufficiently securing the length of the welded portion γ. However, the heat at the time of welding in the welded portion γ is formed so as to be dissipated before reaching the bush hole 51a.

  By configuring as described above, the bush 56 can be fitted into the front end boss member 51 before the front end boss member 51 is welded to the front end 171a of the lift arm 171. Specifically, the heat at the welded portion γ can be dissipated in the middle of the front end side boss member 51 by extending the welded portion γ of the front end side boss member 51 with the front end portion 171a. Without transferring the heat to the bush 56, the bush 56 can be prevented from being adversely affected.

  Thereby, before the front end boss member 51 is welded to the lift arm 171, the bush 56 can be fitted into the front end boss member 51, so that the labor and time for mounting the bush 56 can be reduced. And cost can be reduced.

[Configuration of the Front End 171a of the Lift Arm 171 / Embodiment 4]
Next, the configuration of the front end portion 171a of the lift arm 171 according to the fourth embodiment will be described with reference to FIG. In the present embodiment, the front end side boss member 61 disposed at the front end portion 171 a of the lift arm 171 is configured to have a substantially “6” shape in side view, and the front end side boss member 61 has a substantially L shape in side view. A letter-shaped weld δ is formed, and a bush hole 61a is opened on the front side thereof, and a bush 66 is fitted into the bush hole 61a by a cold fit. And the welding part (delta) is formed in the front end of the front-end part 171a of the said lift arm 171, and a front-part upper surface. That is, the upper side of the front end side boss member 61 is extended toward the front end portion 171a to form the extended portion 61b, so that heat at the time of welding in the welded portion δ is dissipated before reaching the bush hole 61a. It is formed in. In addition, it is desirable that the welded portion δ has a long longitudinal direction and a short vertical direction.

  By configuring as described above, the bush 66 can be fitted into the front end boss member 61 before the front end boss member 61 is welded to the front end 171a of the lift arm 171. Specifically, the heat at the welded portion δ is dissipated in the middle of the front end side boss member 61 by extending the welded portion δ of the front end side boss member 61 with the front end portion 171a to form the extended portion 61b. That is, the heat can be transmitted to the bush 66 without adversely affecting the bush 66.

  Accordingly, the bush 66 can be fitted into the front end boss member 61 before the front end boss member 61 is welded to the lift arm 171, thereby reducing labor and time for mounting the bush 66. And cost can be reduced.

[Configuration of Front End 171a of Lift Arm 171 / Embodiment 5]
Next, the configuration of the front end 171a of the lift arm 171 according to the fifth embodiment will be described with reference to FIG. The present embodiment is configured substantially symmetrically with the fourth embodiment. That is, a bush hole 71a is opened in the front end side boss member 71 disposed at the front end 171a of the lift arm 171, and the bush 76 is inserted into the bush hole 71a by a cold fit. In the front end side boss member 71, the welded portion ε with the front end portion 171a of the lift arm 171 is formed by extending as a heat radiating portion. That is, by extending the lower side of the front end side boss member 71 toward the front end portion 171a to form the extended portion 71b, heat at the time of welding in the welded portion ε is dissipated before reaching the bush hole 71a. It is formed in. In the present embodiment, the extending portion 71b is formed as a stopper for the bucket 173. That is, the extending portion 71b comes into contact with the attachment 173b to regulate the amount of rotation of the bucket 173 during dumping.

  By configuring as described above, the bush 76 can be fitted into the front end boss member 71 and the front end boss member 71 before the front end boss member 71 is welded to the front end 171a of the lift arm 171. The extending portion 71b can be used as a stopper for the bucket 173, and it is not necessary to dispose another member, so that the cost can be reduced.

The whole side view of a work vehicle. The perspective view of a loader. The side view which shows the lift arm which concerns on this invention. The side view which shows the lift arm front-end part which concerns on Example 1. FIG. The side view which shows the lift arm front-end part which concerns on Example 2. FIG. FIG. 6 is a side view showing a front end portion of a lift arm according to a third embodiment. The side view which shows the lift arm front-end part which concerns on Example 4. FIG. FIG. 10 is a side view showing a front end portion of a lift arm according to a fifth embodiment. The side view which shows the conventional lift arm front-end part.

DESCRIPTION OF SYMBOLS 1 Work vehicle 2 Loader 31 Front end side boss member 31b Heat radiation opening 32 Rear end side boss member 32b Heat radiation opening 35 Stopper 171 Lift arm 171a Front end 171b Rear end

Claims (4)

A work vehicle loading device comprising: a work vehicle frame; a lift arm pivotally supported by the work vehicle frame; and a bucket pivotally supported by the lift arm. A front end boss member for pivotally supporting the bucket is welded to the front end portion, and a rear end boss member for pivotally supporting the lift arm at the rear end portion of the lift arm. In the configuration in which the bush hole is eccentrically opened to the tip side that is the anti-lift arm side, and the bush is fitted into the bush hole by a cold fit. The boss member is welded to the lift arm after being inserted into the bush hole, and between the welded portion and the bush hole in the vicinity of the welded portion between the boss member and the lift arm. boss The wood side, constitutes a heat radiating portion, the heat in the welding portion to be transmitted to the bush through the bush hole, the heat radiating portion, loading of the work vehicle, characterized in that heat is radiated before it reaches the said bush apparatus. The work vehicle loading device according to claim 1, wherein the heat dissipating part has a heat dissipating opening in the vicinity of a welded part between the boss member and the lift arm . Loading device. 2. The work vehicle loading device according to claim 1, wherein the heat dissipating part is provided with a heat radiating notch in the vicinity of a welded part between the boss member and the lift arm . 2. The work vehicle loading device according to claim 1, wherein the heat dissipating part is configured so that the boss member has a substantially “6” shape in a side view, and a welded part between the boss member and a lift arm is substantially in a side view. A work vehicle loading device characterized by being configured in a letter shape .

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