JP2015067211A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working vehicle which can reduce the number of part items, and can secure the rigidity of a machine body frame.SOLUTION: A working vehicle in which a front axle case 30 is supported by two front axle brackets 13, 21 comprises: a machine body frame 10 in which reinforcing plates 12 of beams 11 arranged at prescribed intervals are welded to opposing plate faces, and left and right both end parts of one front axle bracket 13 are welded to the reinforcing plates 12; and a front hitch 20 in which left and right both end parts of the other front axle bracket 21 are welded to left and right both ends of a plate-shaped member whose left and right both ends are folded. The two front axle bracket 13, 21 are made to oppose each other, and the front hitch 20 is attached to the machine body frame 10.

Description

  The present invention relates to a work vehicle in which a front axle case is supported by two front axle brackets.

  A front axle case provided in a work vehicle such as a tractor is supported by two front axle brackets. The two front axle brackets are attached to the front part of the body frame, for example, like a work vehicle disclosed in Patent Document 1.

A work vehicle disclosed in Patent Document 1 is configured to screw a plurality of bolts into a plurality of fixing holes provided at a front portion of a body frame and a plurality of mounting holes opened at left and right ends of a front axle bracket. Install the front axle bracket.
In addition, the work vehicle disclosed in Patent Document 1 is configured such that a plurality of bolts are screwed into a plurality of mounting holes provided in front of a fixing hole of a body frame and a mounting hole formed in a front hitch. A front hitch is attached to.

The work vehicle disclosed in Patent Literature 1 requires a large number of bolts because components such as a front axle bracket are attached to the body frame with bolts as separate parts. For this reason, in the work vehicle disclosed in Patent Document 1, the number of parts increases.
In addition, since the work vehicle disclosed in Patent Document 1 fastens the fuselage frame, the front axle bracket, the front hitch, and the like, which are separate parts, with bolts, if the bolt fastening force varies, the rigidity of the fuselage frame increases. There is a possibility that it cannot be secured sufficiently.

JP 2012-126145 A

  The present invention has been made in view of the above situation, and provides a work vehicle that can reduce the number of parts and ensure the rigidity of the body frame.

  In Claim 1, it is a work vehicle by which a front axle case is supported by two front axle brackets, and a reinforcing plate is welded to the opposing plate surfaces of the beams arranged at predetermined intervals, respectively. The body frame constructed by welding both ends of one front axle bracket to the reinforcing plate, and both ends of the other front axle bracket welded to both ends of a plate-like member bent at both ends. And the front hitch is attached to the body frame with the two front axle brackets facing each other.

  According to a second aspect of the present invention, an end portion of the reinforcing plate is extended to an end portion of the airframe frame, and the front hitch is attached to the airframe frame through an end portion of the extended reinforcing plate. is there.

  As effects of the present invention, the following effects can be obtained.

  According to the work vehicle of the first aspect, the number of parts can be reduced and the rigidity of the body frame can be secured.

  According to the work vehicle of the second aspect, it is possible to suppress the decrease in the shape accuracy of the machine body frame and more reliably secure the rigidity of the end of the machine body frame.

The side view which showed the whole structure of the working vehicle which concerns on one Embodiment of this invention. The figure which shows a front axle case. (A) Side view. (B) Top view. The perspective view of a body frame. The side view of a body frame. The perspective view of a front hitch. Explanatory drawing which shows a mode that a front hitch is made to approach a body frame. Explanatory drawing which shows a mode that a front hitch is attached to a body frame. The perspective view which shows the state which attached the front hitch to the body frame.

  Next, an embodiment of the present invention will be described.

First, the whole structure of the work vehicle 1 which concerns on one Embodiment of this invention is demonstrated.
The work vehicle 1 of this embodiment is a tractor. However, the application target of the work vehicle 1 according to the present invention is not limited to the tractor.

In the following, the front-rear direction of the work vehicle 1 is defined with the arrow F direction shown in FIG.
Moreover, below, the up-down direction of the work vehicle 1 is prescribed | regulated by making the arrow U direction shown in FIG. 1 into an upward direction.
And below, the left-right direction of the work vehicle 1 is prescribed | regulated by making the arrow L direction shown in FIG.2 (b) into the left direction.

  As shown in FIG. 1, in the work vehicle 1, an airframe frame 10 is arranged with the longitudinal direction as the front-rear direction.

  The body frame 10 supports the engine 2 via an engine bracket at the front portion thereof. The engine 2 and the like are covered with a bonnet 3.

  The front part of the body frame 10 is supported by the pair of front wheels 4 via the front axle case 30. The rear part of the body frame 10 is supported by a pair of rear wheels 5 via a mission case 40 and a rear axle case 41.

A driving operation unit 6 is disposed on the upper part of the body frame 10. The driving operation unit 6 includes a steering handle 6a and a seat 6b.
The steering handle 6a is configured such that the work vehicle 1 can be steered by changing the steering angle of the pair of front wheels 4 according to the amount of rotational operation. The seat 6b is disposed above the pair of rear wheels 5 so that the driver can sit.

  A work implement mounting device 7 is provided at the rear portion of the driving operation unit 6. The work implement mounting device 7 is configured such that a work implement such as a rotary tiller is connected to the rear end of the top link 7a and the rear end of the lower link 7b, so that the work implement is attached to the rear end of the work vehicle 1. Installing.

  The work vehicle 1 corrects the loss of weight balance in the front-rear direction caused by the work machine being mounted by attaching the front hitch 20 to which the weight is mounted to the front end of the body frame 10.

  As shown in FIGS. 1 and 2, a front axle case 30 is attached to the front portion of the body frame 10.

The front axle case 30 is a hollow member whose longitudinal direction is the left-right direction. A shaft portion 30 a that protrudes in the front-rear direction is formed at the left and right central portion of the front axle case 30.
A pair of front wheels 4 are attached to the left and right side surfaces of the front axle case 30 via a pair of front axles 31.

Such a front axle case 30 is supported by the body frame 10 and the front axle brackets 13 and 21 of the front hitch 20.
The two front axle brackets 13 and 21 will be described in detail later.

As shown in FIG. 1, a transmission case 40 that houses the transmission is attached to the rear of the body frame 10.
A top link 7 a of the work implement mounting device 7 is rotatably connected to the rear portion of the mission case 40.

The mission case 40 supports a pair of rear axle cases 41 on the left and right sides.
A pair of rear wheels 5 is attached to the pair of rear axle cases 41 via a pair of rear axles 42.
A lower link 7b of the work implement mounting device 7 is rotatably connected to the transmission case 40 or the pair of rear axle cases 41.

  The work vehicle 1 is configured to be able to transmit the power of the engine 2 that has been shifted to the pair of front wheels 4 via the pair of front axles 31 after the power of the engine 2 is shifted by the transmission. The rear axle 42 can be transmitted to the pair of rear wheels 5.

The work vehicle 1 travels by rotating the pair of front wheels 4 and the pair of rear wheels 5 by transmitting the power of the engine 2 to the pair of front wheels 4 and the pair of rear wheels 5.
The work vehicle 1 is configured to be able to transmit the power of the engine 2 shifted by the transmission to the work implement. Thereby, the work vehicle 1 drives the working machine.

  Next, the configuration of the body frame 10 will be described.

  As shown in FIGS. 3 and 4, the fuselage frame 10 includes a pair of beams 11, a pair of reinforcing plates 12, a front axle bracket 13, and a pair of attachment members 14.

The pair of beams 11 are disposed with a predetermined interval in the left-right direction while the longitudinal direction is the front-rear direction.
The pair of beams 11 is formed by bending the upper part of the plate-like member arranged so that the plate surfaces face each other outward in the left-right direction (on the opposite beam side, that is, the side away from the other beam 11). Is bent inward in the left-right direction (on the opposite beam side, that is, on the side approaching the opposite beam 11).

The lower portions of the pair of beams 11 are formed in a shape that gradually spreads in an inclined manner from the front to the rear in a side view. The upper parts of the pair of beams 11 are formed in a shape parallel to the front-rear direction in a side view.
That is, the vertical width of the pair of beams 11 gradually increases toward the rear.

  A plurality of (four in this embodiment) attachment holes 11 a for attaching the front hitch 20 to the body frame 10 are formed at the front end portions of the pair of beams 11. Each attachment hole 11 a is a substantially circular hole that penetrates the opposing plate surfaces of the pair of beams 11.

As shown in FIG. 3, the pair of reinforcing plates 12 are plate-like members extending in the front-rear direction from the front end portion of the body frame 10 to the vicinity of the front-rear center portion of the body frame 10. That is, the longitudinal direction of the pair of reinforcing plates 12 is the front-rear direction. The pair of reinforcing plates 12 are arranged on the opposing plate surfaces of the pair of beams 11 such that the plate surfaces are opposed to each other.
The pair of reinforcing plates 12 are arranged on the pair of beams 11 such that the upper portions thereof do not protrude above the pair of beams 11.

Four mounting holes 12a are formed in the pair of reinforcing plates 12 at positions corresponding to all the mounting holes 11a of the pair of beams 11 in a side view.
The mounting holes 12 a of the pair of reinforcing plates 12 are formed in substantially the same shape as the mounting holes 11 a of the pair of beams 11 and penetrate the plate surfaces of the pair of reinforcing plates 12.

Such a pair of reinforcing plates 12 are welded to the opposing plate surfaces of the pair of beams 11, that is, the inner surfaces in the left-right direction.
At this time, the pair of reinforcing plates 12 are welded so that the welded portions are dispersed over the entire reinforcing plate 12 by, for example, welding with a certain interval along the shape of the outer edge portion.

  As a result, the pair of beams 11 are dispersed over a wide range and the pair of reinforcing plates 12 are welded. Therefore, the work vehicle 1 can reduce welding distortion of the pair of beams 11 caused by welding the pair of reinforcing plates 12.

The front axle bracket 13 is a hollow member whose longitudinal direction is the left-right direction. The front axle bracket 13 is formed in a shape in which a cylindrical member having a front-rear direction as a cylinder axis direction is attached to a lower end portion of a left and right central portion of a substantially box-shaped member having both left and right side surfaces opened.
The lower portion of the front axle bracket 13 is formed in a shape that is inclined downward with respect to the left-right direction so as to gradually extend downward toward the center in the left-right direction.

A lower end portion of the center portion in the left-right direction of the front axle bracket 13, that is, a portion corresponding to the cylindrical member is formed as a support hole 13 a penetrating the front axle bracket 13 in the front-rear direction.
The support hole 13a has an inner diameter that is large enough to insert the shaft portion 30a of the front axle case 30 (see FIG. 6). A bearing that supports the shaft portion 30a of the front axle case 30 is provided inside the support hole 13a.

The left and right end portions of the front axle bracket 13 are welded to the front and rear intermediate portions of the pair of reinforcing plates 12.
At this time, the left and right ends of the front axle bracket 13 are welded along the shape of the outer edge.

That is, the front axle bracket 13 is not directly welded to the pair of beams 11.
As a result, the pair of beams 11 receives the welding distortion of the pair of reinforcing plates 12 by welding the front axle bracket 13 in a wide range of the pair of beams 11, so that the welding distortion of the pair of beams 11 can be reduced. it can.

  Thus, the front axle bracket 13 of this embodiment corresponds to one front axle bracket welded to the reinforcing plate of the present invention.

  As shown in FIGS. 3 and 4, the pair of attachment members 14 are plate-like members disposed at the rear end portions of the pair of beams 11 so that the plate surfaces face each other. The pair of attachment members 14 support the mission case 40 with two pins 14a made of bolts, bosses, and the like (see FIG. 1).

The front portions of the pair of attachment members 14 are welded to the pair of beams 11.
At this time, the front part of a pair of attachment member 14 is welded along the shape of the outer edge part.

  That is, the body frame 10 of the present embodiment is configured as an integral part in which a pair of beams 11, a pair of reinforcing plates 12, a front axle bracket 13, and a pair of attachment members 14 are integrally attached by welding.

  Next, the configuration of the front hitch 20 will be described.

As shown in FIG. 5, the front hitch 20 is formed by bending left and right end portions of a plate-like member whose longitudinal direction is the left-right direction into a substantially U shape in plan view. The width of the front hitch 20 in the left-right direction is slightly shorter than the distance in the left-right direction between the opposing plate surfaces of the pair of beams 11. That is, the front hitch 20 is configured to be movable between the opposing plate surfaces of the pair of beams 11.
In the front hitch 20, left and right ends of the bent plate-like member are formed as bent portions 20a.

Four attachment holes 20b are formed in the rear part of the bent part 20a. Four mounting holes 20b are formed on the front side and the rear side of the front axle bracket 21, respectively. That is, the attachment holes 20b are formed at eight places on the bent portion 20a of the front hitch 20.
Each attachment hole 20b of the front hitch 20 is formed so as to coincide with all of the attachment holes 11a of the pair of beams 11 in a side view, that is, in the assembling process. Further, each mounting hole 20 b of the front hitch 20 is formed in substantially the same shape as each mounting hole 11 a of the pair of beams 11.

  The front hitch 20 configured as described above includes a front axle bracket 21.

  The front axle bracket 21 is configured in the same manner as the front axle bracket 13 of the fuselage frame 10 except that the front axle bracket 21 is attached to the front hitch 20 and that the width in the left-right direction is slightly short.

The left and right end portions of the front axle bracket 21 are welded to the opposing plate surfaces of the bent portion 20a of the front hitch 20, that is, both end portions of a plate-like member having both end portions bent.
At this time, the left and right ends of the front axle bracket 21 are welded along the shape of the outer edge.
Thus, the front axle bracket 21 of the present embodiment corresponds to the other front axle bracket welded to the front hitch of the present invention.

That is, the front hitch 20 of the present embodiment is configured as an integral part in which the front axle bracket 21 is integrally attached by welding.
Thereby, since the front hitch 20 has a closed cross-sectional structure, the rigidity is greatly improved as compared with the case where only the front hitch 20 is formed.

  Next, the procedure of the assembly process for attaching the front hitch 20 to the machine body frame 10 will be described.

As shown in FIG. 6, when the front hitch 20 is attached, the rear end portion of the shaft portion 30 a of the front axle case 30 is inserted into the support hole 13 a of the front axle bracket 13 in the body frame 10. To do.
Further, it is assumed that the body frame 10, the front hitch 20, and the front axle case 30 are aligned in the vertical direction by jigs or the like.

First, in the assembling step, the front hitch 20 is brought close to the body frame 10 (see the arrow shown in FIG. 6).
At this time, in the assembling step, the front hitch 20 is brought close to the body frame 10 with the bent portion 20a of the front hitch 20 facing rearward, that is, with the front axle bracket 21 facing the front axle case 30. .

  6 and 7, in the assembly process, the front end portion of the shaft portion 30a of the front axle case 30 is inserted into the support hole 21a of the front axle bracket 21 of the front hitch 20.

  Thus, the two front axle brackets 13 and 21 support the front and rear end portions of the shaft portion 30a of the front axle case 30 by bearings provided on the inner side surfaces of the support holes 13a and 21a.

As shown in FIG. 7, in the assembly process, bolts 21 b are screwed into the support holes 21 a of the front axle bracket 21 of the front hitch 20 from the front to fix the front axle case 30 to the two front axle brackets 13 and 21.
Thereby, the work vehicle 1 supports the front axle case 30 by the two front axle brackets 13 and 21.

  At this time, in the assembly step, the position of the front hitch 20 is adjusted so that the positions of the mounting holes 20b of the front hitch 20 are set to the positions of the mounting holes 11a and 12a of the pair of beams 11 and the pair of reinforcing plates 12, respectively. Match.

After the front axle case 30 is fixed, in the assembly process, the pair of beams 11, the pair of reinforcing plates 12, and the mounting holes 11 a, 12 a, and 20 b of the front hitch 20 from the outside in the left-right direction of the pair of beams 11. Screw in the bolt 15.
Thus, in the assembly process, the front hitch 20 is detachably attached to the body frame 10.

  Thus, as shown in FIG. 8, the work vehicle 1 attaches the front hitch 20 to the body frame 10 with the two front axle brackets 13 and 21 facing each other.

  As described above, the work vehicle 1 according to the present embodiment includes only a pair of beams 11, a pair of reinforcing plates 12, two front axle brackets 13, 21, and a pair of bolts 15 that connect the body frame 10 and the front hitch 20. The attachment member 14 and the front hitch 20 can be connected.

  That is, since the work vehicle 1 can connect many parts with a small number of bolts 15, the number of parts can be reduced.

The pair of reinforcing plates 12 are welded to the pair of beams 11. Therefore, the positions of the mounting holes 11a and 12a of the pair of beams 11 and the pair of reinforcing plates 12 are adjusted so that the bolt 15 can be screwed in before the assembly process.
Accordingly, the work vehicle 1 can be obtained by simply aligning the mounting holes 20b of the front hitch 20 with the mounting holes 11a and 12a of the pair of beams 11 and the pair of reinforcing plates 12 that have been aligned in advance. The front hitch 20 can be connected.

That is, the work vehicle 1 can simplify the work of aligning the positions of the mounting holes 11a, 12a, and 20b. Further, the work vehicle 1 can reduce the number of parts, thereby reducing the work of connecting parts with bolts or the like.
Therefore, the work vehicle 1 can simplify the assembly process.

  The work vehicle 1 includes a pair of beams 11, a pair of reinforcing plates 12, a front axle bracket 13, and a pair of mounting members 14 as an integral part by welding, thereby forming a pair of beams, a pair of reinforcing plates, and a front axle bracket. As compared with the case where the pair of mounting members are connected as separate parts with bolts or the like, the strength of the body frame 10 can be improved.

In other words, the work vehicle 1 has a configuration in which the fuselage frame 10 that is an integral part and the front hitch 20 that is an integral part are connected by the bolts 15 before and after the front axle bracket 21, thereby reducing variations in bolt fastening force. It is possible to suppress the lowering of the rigidity of the airframe 10 and the uneven rigidity balance between the front axle bracket 13 and the front axle bracket 21.
Therefore, the work vehicle 1 can ensure the rigidity of the body frame 10.

The front axle bracket 13 of the fuselage frame 10 is welded to the pair of reinforcing plates 12 so as to be attached to the pair of reinforcing plates 12 in a state where the longitudinal direction is somewhat parallel to the left-right direction before the assembly process. It becomes.
The same applies to the front axle bracket 21 of the front hitch 20.

  For this reason, the work vehicle 1 compares the position accuracy of the two front axle brackets 13 and 21 with respect to the left-right direction, compared with the case where the two front axle brackets are respectively attached to the body frame and the front hitch with bolts or the like. The degree of parallelism can be improved.

Here, for example, when a pair of reinforcing plates and two front axle brackets are welded to the front hitch and the front hitch is configured as an integral part, the front hitch is fixed to the front and rear ends of the pair of beams with bolts. It will be.
In this case, the width of the front hitch in the front-rear direction is increased by the amount of welding of the pair of reinforcing plates.
Therefore, in this case, when the front hitch is replaced after the work vehicle is shipped, it becomes difficult to pull out the front hitch and move the front hitch to the inside of the pair of beams.

On the other hand, the front hitch 20 of this embodiment only welds the front axle bracket 21. For this reason, the front hitch 20 does not become long in the front-rear direction after welding.
Therefore, the work vehicle 1 of the present embodiment has a configuration in which the front hitch 20 can be easily replaced even after being shipped. Moreover, since the work vehicle 1 can easily replace the front hitch 20 with a dedicated part for attaching a loader or the like, it can be used for various purposes.

  That is, the work vehicle 1 can improve maintainability and versatility.

  The work vehicle 1 of this embodiment extends the front end portions of the pair of reinforcing plates 12 to the front end portions of the pair of beams 11, thereby increasing the area of the plate surfaces of the pair of reinforcing plates 12.

According to this, the work vehicle 1 can widely disperse the welding locations between the pair of beams 11 and the pair of reinforcing plates 12 in the front-rear direction.
Therefore, the work vehicle 1 can disperse the places where the welding distortion of the pair of beams 11 occurs.

  That is, the work vehicle 1 can suppress a decrease in the shape accuracy of the body frame 10.

Further, by extending the front end portions of the pair of reinforcing plates 12 to the front end portions of the pair of beams 11, the front hitch 20 is attached to the body frame 10 via the front end portions of the extended pair of reinforcing plates 12. Become.
That is, in the body frame 10, the pair of reinforcing plates 12 and the front hitch 20 are connected to the front end portions of the pair of beams 11.

  Therefore, the work vehicle 1 can ensure the rigidity of the front end portion of the body frame 10. That is, the work vehicle 1 can ensure the rigidity of the body frame 10 more reliably.

  The parts for detachably attaching the front hitch to the body frame are not limited to the bolts as in the present embodiment, and may be pins or the like, for example.

DESCRIPTION OF SYMBOLS 1 Work vehicle 10 Airframe frame 11 Beam 12 Reinforcement plate 13 Front axle bracket 20 Front hitch 20a Bending part 21 Front axle bracket 30 Front axle case

Claims (2)

A work vehicle in which a front axle case is supported by two front axle brackets,
A fuselage frame constructed by welding reinforcing plates to opposite plate surfaces of beams arranged at predetermined intervals, and welding both ends of one of the front axle brackets to the reinforcing plate. When,
A front hitch configured by welding both ends of the other front axle bracket to both ends of a plate-like member having both ends bent;
Comprising
The front hitch is attached to the fuselage frame with the two front axle brackets facing each other.
Work vehicle. The end of the reinforcing plate is
Stretched to the end of the fuselage frame,
The front hitch is
Attached to the fuselage frame via the end of the stretched reinforcing plate,
The work vehicle according to claim 1.

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