JPH08112007A - Device for attaching working machine - Google Patents

Abstract

PURPOSE: To simplify works for attaching draw bar-attaching members and low link-attaching pins and further prevent the generation of cracks in the body of the tractor. CONSTITUTION: In the working machine-attaching device provided with a draw bar 2 having a draw bar-attaching member 5 fixed to the body 3 of the tractor, and with a three point link 1 having a lower link 13 connected to the body 3 of the tractor through a lower link-attaching pin 15, the lower link-attaching pin 15 of the three point link 1 is integrally connected to the draw bar-attaching member 5 to allow the draw bar-attaching member 5 to play a role as a bracket for attaching the lower link-attaching pin 15 to the body 3 of the tractor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work machine mounting apparatus mounted on a rear portion of a tractor.

[0002]

2. Description of the Related Art As a mounting device for various working machines mounted on the rear portion of a tractor, there are a tow type drawbar, a direct mounting type three-point link, and the like. Generally, a direct mounting type with a three-point link is often used, but various types cannot be attached by one three-point link because of differences in the size, structure, and working conditions of working machines. for that reason,
Usually, as shown in FIG. 7, both the drawbar 31 and the three-point link 32 are equipped.

A conventional drawbar 31 is a tractor body 33.
The mounting member 34 fixed to the mounting member 34 is provided, and the hitch portion 35 is provided at the rear end portion of the mounting member 34. Further, in the three-point link 32, a lower link mounting pin 36 is inserted into a mounting hole (not shown) provided in the tractor vehicle body 33, and the lower link mounting pin 36 is fixed to the tractor vehicle body 33 by a mounting bracket 37. The lower link 38 is connected to the mounting pin 36, and the lift arm 3
9, a lift rod (not shown) and the like (see, for example, Japanese Utility Model Publication No. 6-33762).

[0004]

As described above, according to the conventional structure, the lower link mounting pin 36 of the three-point link 32 and the mounting member 34 of the drawbar 31 are individually mounted to the tractor body 33, so that the tractor body 33 is constructed. In the above production line, the mounting pin 36 and the mounting member 34 must be individually mounted and fixed, and the assembling work is complicated and inefficient.

Further, since the tractor body 33 is generally manufactured by casting and has poor toughness, in the structure in which the mounting pin 36 is inserted into the mounting hole provided in the vehicle body 33 as in the prior art, a three-point link is used. In order to be able to withstand the load from a working machine such as a rotary or plow connected to 32, it is necessary to make it thick to a certain extent, which leads to an increase in vehicle body weight and an increase in cost.

Therefore, the present invention integrates the attachment pin of the three-point link and the attachment member of the draw bar into one body to facilitate the work of assembling these to the tractor vehicle body, and further,
The purpose is to reduce the weight of the vehicle body and reduce the cost.

[0007]

In order to achieve the above object, the present invention takes the following technical means. That is,
The present invention relates to a working machine mounting apparatus including a drawbar including a drawbar mounting member fixed to a tractor vehicle body, and a three-point link including a lower link connected to the tractor vehicle body via a lower link mounting pin. The lower link mounting pin of the three-point link is integrally fixed to the drawbar mounting member, and the drawbar mounting member constitutes a bracket for mounting and fixing the lower link mounting pin to the tractor vehicle body. The member includes a base plate portion that is overlaid on the lower surface of the tractor vehicle body, and side plate portions that extend downward from the left and right side edges of the base plate portion. The side plate portion has a mounting hole through which the lower link mounting pin is inserted. The lower link mounting pin that is provided and inserted through the mounting hole is in contact with the lower surface of the base plate portion, and the lower link mounting pin and the base plate unit are in contact with each other at the corresponding contact portion. Together they are against fixed, and the outer peripheral surface of the peripheral portion and the lower link attachment pins of the mounting hole is characterized in that it is fixed by welding.

[0008]

In the tractor manufacturing line, when the drawbar mounting member is fixed to the vehicle body of the tractor, the lower link mounting pin of the three-point link is integrally fixed to this mounting member. It is not necessary to carry out the mounting and fixing work of, and the assembling work in the production line can be simplified and made more efficient.

Further, since the lower link mounting pin is indirectly fixed to the tractor vehicle body through the drawbar mounting member, the weight increase of the tractor vehicle body can be suppressed and the cost can be reduced. Further, the lower link mounting pin is welded and fixed at a contact portion of the drawbar mounting member with the base plate portion, and also fixed by welding to a peripheral portion of a mounting hole provided in the side plate portion.
That is, since it is welded and fixed to the drawbar mounting member at a plurality of positions in the axial direction of the mounting pin, the mounting pin and the mounting member are firmly fixed, and the load applied to the mounting pin can withstand.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a rear portion of a tractor equipped with a work implement mounting apparatus according to the present embodiment, which includes a three-point link 1 and a drawbar 2. In this embodiment, the drawbar 2
Is equipped with a drawbar mounting member 5 that is firmly connected and fixed by a plurality of bolts 4 and the like to the lower rear portion of the tractor vehicle body 3 including a transmission case and the like. The mounting member 5 is mainly formed by bending a steel plate, and constitutes a cross member in relation to the tractor vehicle body 3.

The drawbar mounting member 5 is composed of a base plate portion 6 that is superposed on the lower surface of the vehicle body 3 and side plate portions 7 that extend downward from the left and right side edges of the base plate portion 6 and has a substantially U-shaped cross section. A hitch portion 8 such as an auxiliary tractor is provided at the rear end portion (right side in the drawing). The side surface of the tractor vehicle body 3 and the side plate portion 7 of the mounting member 5 are connected to each other by a bracing member 9, and the right and left sides of the transmission box 11 having the PTO shaft 10 are protected by the bracing member 9.

In the present embodiment, the drawbar 2 is of the fixed type, but it may be a swing drawbar. The three-point link 1 includes a pair of left and right lift arms 12 attached to the upper rear portion of the tractor body 3 so that one end thereof swings up and down, and a pair of left and right lower links 13 attached to the lower rear portion of the vehicle body 3. A lift rod (not shown) that connects the lift arm 12 and a middle portion of the lower link 13 is provided, and the lift arm 12 is vertically swung by a hydraulic lifting device 14 mounted on the upper rear portion of the tractor vehicle body 3. A working machine (not shown) such as a rotary or a plow connected to the three-point link 1 can be moved up and down.

The lower link 13 of the three-point link 1 is connected via left and right lower link mounting pins 15 protruding leftward and rightward from the tractor vehicle body 3, and its rear end side is vertically swingable. The lower link mounting pin 15 is attached to the vehicle body 3
It is not directly fixed to, but is integrally fixed to the attachment member 5 of the drawbar 2 by welding. Thus, the drawbar mounting member 5 constitutes a bracket for mounting and fixing the lower link mounting pin 15 to the tractor vehicle body 3. That is, in this embodiment, the drawbar mounting member 5 has three functions of mounting the pulling member to the vehicle body 3, functioning as a cross member of the vehicle body 3, and functioning as a bracket of the mounting pin 15.

By the way, the lower link mounting pin 15 has
A load directed in the front-rear direction acts during the operation of the working machine such as a rotary or plow, and a vertical load acts when the working machine is moved up and down. Therefore, since a large bending stress and a shearing stress are generated in the mounting pin 15 by these loads, the mounting pin 15 and the mounting member 5 must be firmly welded and fixed. On the other hand, in this embodiment, since the mounting member 5 is formed by bending a steel plate, it is important how to fix the mounting member 5 and the mounting pin 15 by welding in order to strengthen the connection between them. Become.

Therefore, in this embodiment, the mounting member 5 and the mounting pin 15 are welded and fixed by the fixing structure described below. As shown in FIG. 2 and FIG. 3, the lower link mounting pin 15 is made of steel, and has a base shaft portion 15a and a shaft body portion 1 having a diameter larger than that of the base shaft portion 15a connected to the base shaft portion 15a.
5b and a shaft end portion 15c connected to the shaft body portion 15b and having a diameter smaller than that of the shaft body portion 15b.

The side plate portion 7 of the mounting member 5 of the drawbar 2 is
A mounting hole 16 having a size to which the base shaft portion 15a of the mounting pin 15 is just fitted is provided. The mounting hole 16 is opened to the left and right, and the upper side of the mounting hole 16 is also opened. The mounting hole 16 is formed by forming a long hole 17 by press working as shown in FIG. 4 (a) before bending the mounting member 5 and then as shown in FIG. 4 (b). The side plate portion 7 including 17 is bent, and the mounting hole 16 is formed by the elongated hole 17 whose upper side is bent in this manner.

Further, a mounting hole 16 is provided on the outer surface of the side plate portion 7.
The reinforcing plate 18 is welded and fixed to the upper part. The reinforcing plate 18 is provided with a support hole 19 having a size into which the shaft body portion 15b of the mounting pin 15 is just fitted. Mounting pin 15
Has its base shaft portion 15b inserted through the mounting hole 16, and the upper edge of the base shaft portion 15b is in contact with the lower surface of the base plate portion 6 of the mounting member 5 along the axial direction. ) Is welded and fixed, and the peripheral edge portion of the mounting hole 16 and the outer peripheral surface of the base shaft portion 15b are welded and fixed from the inner surface side of the side plate portion 7 (B portion in FIG. 2). Further, the shaft body portion 15b of the mounting pin 15 is in contact with the outer surface of the side plate portion 7 of the mounting member 5, and the peripheral edge portion of the support hole 19 and the outer peripheral surface of the shaft body portion 15b are welded and fixed ( (Part C in FIG. 2).

The lower link 13 is connected to the shaft end portion 15c of the mounting pin 15. Therefore, even when a high load is applied to the shaft end portion 15c to which the lower link 13 is connected, the moment around the mounting hole 16 generated in the mounting pin 15 causes the base shaft portion 15a and the mounting member 5 inside the mounting hole 16. The welded portions A of and are supported by the reinforcing plate 18 on the outside of the mounting hole 16, respectively, so that the joint between the mounting pin 15 and the mounting member 5 is prevented from being damaged.

Further, the span of the base shaft portion 15a can be made larger than that in the case where the mounting pin 15 is directly fixed to the tractor body 3, so that the base shaft portion 15a and the mounting member 5 can be provided.
It is possible to secure a large welding range with and to fix it more firmly. Note that FIG. 5 shows the inside of the independent cabin 20 mounted on the tractor body 3. The cabin 20 includes a floor plate 21, a driver's seat 22 installed on the floor plate 21, a pair of left and right fenders 23 positioned on the left and right sides of the driver seat 22, and the like.

On the inner side wall of the fender 23, reinforcing ridges 2 are provided for reinforcement.
Several 4 are provided, and a lever bracket 28 that guides the sub-transmission lever 26 and the PTO operation lever 27 is fixed to the inner surface of the fender 23 provided with the protrusion 24. The lever bracket 28 includes a fixing plate 28 a that is superposed on the inner surface of the fender 23 and the fixing plate 2 a.
8a, and a mounting base 28b that protrudes inward from the upper edge of 8a.

To attach the lever bracket 28 and the fender 23, as shown in FIG. 6, a nut 29 is welded and fixed to the outer surface of the fixing plate 28a of the lever bracket 28 in advance, and the bolt 30 is attached from the outer side of the fender 23. The nut 29
It is done by screwing and fastening to. Therefore, even if the protrusion 24 is provided on the outer surface of the fender 23, the nut 29 welded to the bracket 28 also functions as a spacer (color), and the nut 29
With this, the fender 23 and the lever bracket 28 can be firmly fixed while providing a predetermined gap therebetween, a separate component such as a collar is not required, the number of components can be reduced, and the cost can be reduced.

The present invention is not limited to the above embodiment, but can be appropriately modified in design.

[0023]

As described above, in the working machine mounting apparatus of the present invention, the lower link mounting pin of the three-point link is integrally fixed to the drawbar mounting member, and the drawbar mounting member is the lower link mounting pin. Since the bracket that attaches and fixes to the tractor vehicle body is configured, by fixing the drawbar mounting member to the tractor vehicle body in the tractor manufacturing line, the lower link mounting pin of the three-point link is integrally fixed to this mounting member. Therefore, it is not necessary to separately mount and fix the mounting pins of the lower link, and simplification and efficiency of the assembly work in the manufacturing line can be achieved.

Further, the drawbar mounting member includes a base plate portion which is superposed on the lower surface of the tractor vehicle body, and side plate parts which extend downward from the left and right side edges of the base plate portion, and the lower link mounting pin is attached to the side plate part. Is provided, and the lower link mounting pin inserted through the mounting hole is in contact with the lower surface of the base plate portion, and the lower link mounting pin and the base plate portion are fixed by welding at the corresponding contact portion. In addition, since the peripheral edge of the mounting hole and the outer peripheral surface of the lower link mounting pin are welded and fixed, the lower link mounting pin and the drawbar mounting member can be firmly fixed, and work connected to the three-point link It is possible to withstand the load from the machine, reduce the weight of the tractor body, and reduce the cost.

[Brief description of drawings]

FIG. 1 is a left side view showing a work machine mounting apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view corresponding to a cross section taken along line I-I of FIG. 1, showing a fixing structure of a lower link mounting pin and a drawbar mounting member of the same embodiment.

FIG. 3 is a perspective view showing the fixing structure.

FIG. 4 is an explanatory view showing a perspective view of the manufacturing process of the drawbar mounting member, in which (a) is a state in which the mounting holes are pressed,
(B) shows a state in which the side plate portion is bent.

FIG. 5 is a perspective view showing the inside of the cabin of the tractor of the embodiment.

FIG. 6 is a sectional view showing a fixing structure of a fender and a lever bracket.

FIG. 7 is a left side view showing a conventional work machine mounting device.

[Explanation of symbols]

 1 three-point link 2 drawbar 3 tractor vehicle body 5 drawbar mounting member 6 board part 7 side plate part 15 three-point link 16 mounting hole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B60D 1/26

Claims (1)

[Claims] 1. A drawbar (2) having a drawbar mounting member (5) fixed to a tractor vehicle body (3) and a lower link connected to the tractor vehicle body (3) via a lower link mounting pin (15). Three-point link with (13) (1)
A work implement mounting apparatus comprising: a lower link mounting pin (15) of the three-point link (1)
Is integrally fixed to the drawbar mounting member (5),
The drawbar mounting member (5) constitutes a bracket for mounting and fixing the lower link mounting pin (15) to the tractor vehicle body (3), and the drawbar mounting member (5) is mounted on the lower surface of the tractor vehicle body (3). A board part (6) to be superposed and a side plate part (7) extending downward from the left and right side edges of the board part (6) are provided, and the lower link mounting pin (15) is provided on the side plate part (7). A mounting hole (16) through which the lower link mounting pin (15) is inserted, and the lower link mounting pin (15) inserted into the mounting hole (16) is in contact with the lower surface of the substrate portion (6). In, the lower link mounting pin (15) and the substrate portion (6) are welded and fixed, and the peripheral edge of the mounting hole (16) and the outer peripheral surface of the lower link mounting pin (15) are welded and fixed. A working machine mounting device characterized by being installed.