JPH0779605A - Lower link supporting device in tractor - Google Patents

Abstract

PURPOSE:To increase strength of a case made of cast metal such as a brake case attached to the rear of a tractor body and to inexpensively produce the case. CONSTITUTION:In a tractor wherein a cast metal case 65 is arranged at the rear of a tractor body, the tractor body is equipped with a main frame to fix a back hoe and the cast metal case 65 is provided with a fitting part 67 for attaching a lower link pin 66 for supporting a lower link, a pin bracket 69 protrusively furnished with the lower link pin 66 and a connecting bracket 70 for coupling the main frame with the cast metal case 65 are laid so as to hold the fitting part 67 of the cast metal case 65 from both right and left sides, and both the brackets 69 and 70 are fixed to the fitting part 67 by binding of a fastening tool 74.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower link supporting device for a tractor in which a lower link pin for supporting a lower link is attached to a rear portion of a tractor vehicle body.

[0002]

2. Description of the Related Art A tractor is provided with a cast brake case at the rear of a tractor vehicle body and a main frame for mounting a backhoe on the tractor vehicle body. The cast case has a lower link for supporting a lower link. Some of the conventional tractors of this type are provided with a mounting portion for mounting a pin, but as shown in FIG. 12, a brake case 10 made of a casting is provided on the rear portion of the tractor vehicle body.
A pin bracket 105 having a lower link pin 103 projectingly is tightened and fixed to a mounting portion 104 provided in No. 2 with a bolt 106.

[0003]

Therefore, in the conventional case,
The lower link pin 10 is attached to the cast brake case 102.
Since 3 is cantilevered with bolts 106,
The impact of the lower link is directly applied to the brake case 102, so that it is necessary to make the brake case 102 strong, and the cost of the brake case 102 becomes high.

In view of the above problems, the present invention provides a cast case such as a brake case provided at the rear portion of a tractor vehicle body with high strength and at the same time, can be manufactured at low cost.

[0005]

The technical means of the present invention for solving this technical problem is that a casting case 65 is provided at the rear of the tractor body 2 and a main body for mounting the backhoe 4 on the tractor body 2. A frame 16 is provided,
In a tractor in which a mounting portion 67 for mounting a lower link pin 66 for supporting a lower link is provided in the casting case 65, a pin bracket 69 protruding from the lower link pin 66, the main frame 16 and the casting case 65. And a connecting bracket 70 for connecting the bracket and the bracket 67 are provided so as to sandwich the mounting portion 67 of the casting case 65 from both left and right sides, and both brackets 69 and 70 are fixed to the mounting portion 67 by joint fastening with a fastener 74. It is in.

[0006]

The casting case 65 such as the brake case can be integrally connected to the main frame 16 by the connecting bracket 70, and the impact of the lower link 78 can be prevented.
Even if the cast case 65 starts from 6
6, the cast case 65 can be effectively reinforced.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 4 to 8, reference numeral 1 denotes a tractor, which connects a front loader 3 to a front portion of a tractor vehicle body 2 and a backhoe 4 to a rear portion thereof. The tractor body 2 is configured by directly connecting an engine 5, a flywheel housing, a clutch housing 8, a transmission case 9 and the like in the front-rear direction, and a front axle frame 10 is provided so as to project from the engine 5 to the front.

At the rear of the tractor body 2, rear axle cases 13 are projected from the left and right sides of the mission case 9, and left and right rear wheel fenders 14 are attached to the rear axle cases 13.
A driver's seat 15 is disposed on the tractor body 2 between the left and right rear wheel fenders 14, and a pair of left and right main frames 16 for mounting the backhoe 4 on the tractor body 2 are fixed to each rear axle case 13. ing.

The front loader 32 has a mast 19, a boom 20, a boom cylinder 21, a brace 22 and the like. The back hoe 4 is pivotally supported by a base 24, a mounting body 25 at the front thereof, a control section 26 at the upper portion thereof, a swivel 27 pivotally supported at the rear of the base 24, and a swivel 27 via a horizontal axis. It has a boom 28, a swing cylinder 29, a boom cylinder 30, and the like.

Reference numeral 31 is a rear frame device, which is erected on the rear portion of the tractor body 2 and has a canopy 32 mounted on the upper portion thereof.
The front portion of the canopy 32 is connected to the mast 19 or the tractor vehicle body 2 side by a front support column 33, and these constitute a four-column type sunshade device 34. The left and right masts 19 of the front loader 3 are fitted and welded to a tubular body 36 fixed to the tractor vehicle body 2 to form an integral structure that cannot be separated from the tractor vehicle body 2.

A bracket 37 is provided rearward from each of the cylinders 36.
Is projected, and the main frame 16 is attached to the bracket 37.
The tip of is fixed with a bolt. Left and right main frame 1
6 is detachably connected to each other by a connecting rod 39, and each main frame 16 has a triangular plate 41 fixed to a substantially horizontal square pipe member 40, and a hook member 38 is attached to a rear portion of the triangular plate 41.
Are welded to each other, and a lower connecting portion 42 is formed in the lower rear portion of the main frame 16, and an upper connecting portion 43 is formed in the upper rear portion by a pin hole.

The lower connecting portion 42 receives the engaging pin 44 provided on the mounting body 25 of the backhoe 4, and the upper connecting portion 43 can insert the connecting pin 45 penetrating the mounting body 25. Rear work implement connecting means is configured to detachably connect the backhoe 4 to the backhoe 16. In the main frame 16, a horizontal plate 47 provided on the outer surface is arranged below the rear axle case 13, and a bolt is passed through an upper plate 48 arranged above the rear axle case 13 so that the rear axle case 13 is formed by both plates.
It is fixed to the rear axle case 13 by sandwiching. The vertical plate 49 is a reinforcing plate, and the rear portion of the upper plate 48 is bolted to the vertical plate 49.

A pair of front and rear receiving plates 51 are welded to the upper portion of the inner surface of the main frame 16 to form the front and rear receiving plates 5.
The back plate 52 facing the connecting body 6 is welded to the first member 1, the square holes 53 are formed by these, and the upper ends of the front and rear receiving plates 51 are bent in the front and rear opposite directions to form the receiving surface 54. The frame receiving part 55 is configured. An upper connecting portion 43 is also formed on the rear portion of the back plate 52, and the connecting pin 45 is supported by both ends.

The rear frame device 31 is substantially parallel to the rear wheel fender 14 from the left and right lower end portions 56 to the middle portion thereof, and spreads to the left and right outward at the middle portion to extend to the upper side of the rear wheel fender 14 and the canopy 32. To the attachment part of the rear frame device 3
The upper part of the rear wheel fender 14 and the rear wheel fender 14 are connected by a handrail member 59. This rear standing frame device 31
Is formed of a square pipe, a contact plate 60 is fixed to the outer surface of each lower end portion 56, and an L-shaped mounting plate 61 is formed on the front and rear surfaces.
Is stuck.

The lower end portion 56 is a square hole 53 of the frame receiving portion 55.
When this is inserted, the lower edge of the contact plate 60 contacts the upper edge of the triangular plate 41 of the main frame 16,
The mounting plate 61 abuts on the receiving surface 54 of the receiving plate 51 to be received. In this state, the rear frame device 31 is connected to the main frame 16
Can be held in a temporary state, and the receiving plate 51 and the mounting plate 61 can be held.
When and are fixed by bolts, the trailing frame device 31 is fixed to the main frame 16.

Reference numeral 66 denotes the horizontal plate 4 of the main frame 16.
It is a check chain connecting portion fixed to the lower surface of 7. Figure 1
In FIG. 3, reference numeral 65 denotes a pair of left and right casting brake cases, and a mounting portion 67 for mounting a lower link pin 66 for supporting a lower link is provided at a lower end portion thereof. Reference numeral 69 denotes a pair of left and right pin brackets on which the lower link pins 66 are provided so as to project. Reference numeral 70 denotes a pair of left and right connecting brackets that connect the main frame 16 and the brake case 65, and each connecting bracket 70 has mounting plates 71 at both left and right ends.
72, and a connecting rod 73 for connecting the mounting plates 71, 72. The mounting plate 71 is slanted upward and the mounting plate 72
Is inclined rearward and upward, and the mounting plates 71 and 72 are oriented in directions orthogonal to each other. The pin bracket 69 and the mounting plate 71 of the connecting bracket 70 are used for the brake case 6
The mounting portion 67 of No. 5 is arranged so as to be sandwiched from the left and right sides, and is fixedly fastened to the mounting portion 67 by co-tightening with a bolt nut 74. The main frame 16 and the mounting plate 72 of the connecting bracket 70 are fastened and fixed by a nut 75 welded to the main frame 16 and a bolt 76 screwed to the nut 75. Lower link pin 66
The front end portion of the lower link 78 is externally fitted and held, and is prevented from coming off by the coming-off prevention pin 79.

In the above embodiment, the brake case 65 is used as the casting case, but instead of this, a rear axle case or the like may be used as the casting case. FIG. 9 shows a comparative example with the present invention, in which a mounting case 81 is integrally provided on a brake case 65 made of casting, the main frame 16 is fastened and fixed to the mounting section 81 by bolts 82, and the lower link pin 66 is also provided. The pair of left and right pin brackets 69 projecting from are fixed to the brake case 65 by bolts 83. In this case, even if an impact from the lower link is applied from the lower link pin 66 to the brake case 65, the main frame 16 is integrated with the brake case 65, so that the strength of the brake case 65 is increased, but the main frame 16 is attached to the brake case 65. Since it is necessary to integrally provide the convex portion 81, there is a problem that the manufacture of the brake case 65 is troublesome and the manufacturing cost is high.

10 and 11 show another comparative example of the present invention, in which a check chain bracket 85 is provided on the lower surface of the horizontal plate 47 of the main frame 16 to connect the check chain bracket 85 and the brake case 65. And a pair of left and right pin brackets 69 provided with a reinforcing member 86 and a mounting plate 87 of the reinforcing member 86 protruding from the lower link pin 66.
Along with this, the bolts and nuts 88 are used for fastening together and the reinforcing bar 89 of the reinforcing member 86 is fastened and fixed to the check chain bracket 85 with bolts 90. In this case, the brake case 65 can be reinforced by connecting the brake case 65 and the check chain bracket 85 with the reinforcing member 86, but the check chain bracket 85 is much shorter and weaker than the main frame 16, so The strength is weaker than when the brake case 65 and the main frame 16 are connected as in the invention. In the illustrated example, the check chain 91 is hooked on the recess 92 of the reinforcing bar 89, but the check chain 91 may be connected to the check chain bracket 85.

[0019]

According to the present invention, the pin bracket 69 having the lower link pin 66 projecting therefrom and the connecting bracket 70 for connecting the main frame 16 and the casting case 65,
Since the mounting portion of the casting case 65 is provided so as to sandwich the mounting portion from both the left and right sides, and both brackets 69 and 70 are fixed to the mounting portion 67 by co-fastening with the fastener 74, the casting case 65 is connected to the main frame by the connecting bracket 70. Even if the impact of the lower link 78 is applied from the lower link pin 66 to the casting case 65, the casting can be performed by the main frame 16 which is considerably long and strong in the front and rear direction via the connecting bracket 70. The case 65 can be effectively reinforced. Moreover, the cast case 65 such as a brake case can be strengthened by effectively utilizing the main frame 16 for mounting the backhoe 4 on the tractor vehicle body 2. Therefore, it is not necessary to increase the strength of the cast case 65 itself. 65 can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a back cross-sectional view of a lower link support device portion showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the lower link support device portion.

FIG. 3 is a side view of the lower link support device portion.

FIG. 4 is a side view of the same.

FIG. 5 is an overall rear view of the same.

FIG. 6 is an exploded side view of the same.

FIG. 7 is a plan view of the same.

FIG. 8 is a rear view of the same.

FIG. 9 is a side view showing a comparative example with the present invention.

FIG. 10 is a side view showing a comparative example with the present invention.

FIG. 11 is an exploded perspective view of the same.

FIG. 12 is a perspective view showing a conventional example.

[Explanation of symbols]

 1 tractor 3 tractor vehicle body 4 backhoe 5 brake case 66 lower link pin 67 mounting portion 69 pin bracket 70 connecting bracket 74 bolt nut 78 lower link

Claims (1)

[Claims] 1. A casting case (65) is provided at the rear of the tractor body (2), and a main frame (16) for mounting a backhoe (4) is provided on the tractor body (2). 65), a mounting portion (6) for mounting the lower link pin (66) for supporting the lower link.
In the tractor provided with 7), the pin bracket (69) protruding from the lower link pin (66) and the connecting bracket (70) connecting the main frame (16) and the casting case (65), The casting case (65)
It is provided so as to sandwich the mounting part (67) of
A lower link support device for a tractor, wherein both brackets (69), (70) are fixed to a mounting portion (67) by co-fastening with a fastener (74).