JP3067063B2 - Tractor body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor body structure.

[0002]

2. Description of the Related Art A tractor body is constructed by connecting an engine, a flywheel housing, a clutch housing, and a transmission case in a front-rear direction. In some cases, the front and rear middle portions of the upper surface of the transmission case are lowered to make the deck on the transmission case flat.

[0003]

When a front loader is mounted at the front of the tractor and a backhoe is mounted at the rear of the tractor, mounting frames having mounting portions at the front and rear are fixed to the left and right sides of the vehicle body, and are mounted via the mounting frames. A front loader and backhoe are mounted. And when using the front loader or backhoe, a great deal of stress is generated in the vehicle body despite being reinforced by the mounting frame, especially,
In a transmission case as shown in the conventional example, since there is a bent portion on the upper surface side of the case, there is a problem in strength that stress is concentrated on that portion.

Accordingly, an object of the present invention is to provide a vehicle body structure of a tractor capable of satisfying sufficient vehicle body strength even when a front loader and a backhoe are mounted using a current transmission case.

[0005]

The technical means taken by the present invention to achieve the above object is that a transmission case 5 constituting a tractor vehicle body 6 is formed with an outer wall portion of the case 5.
Dispersion and relaxation of the stress concentration in the part where the stress changes due to shape change
This is because a reinforcing plate 16 is provided along the outer surface of the transmission case 5 in order to allow the transmission.

[0006]

The stress concentration at the shape-changed portion is dispersed and alleviated by the reinforcing plate provided at the shape-changed portion of the transmission case.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show a first embodiment. In FIG. 1, reference numeral 1 denotes a tractor, which is an engine 2, a flywheel housing 3, a clutch housing 4, and a transmission case 5.
Are joined in the front-rear direction to form a vehicle body 6.
A mounting frame 7 extending in the front-rear direction is fixed to both left and right sides of the vehicle.

The transmission case 5 is made of a casting (FC25).
0), and the front case 10, the intermediate case 11, and the rear case 12, which are integrated with the clutch housing 4, are connected back and forth. As shown in FIG. 2 and FIG.
The upper wall 13 is formed lower than the upper walls of the clutch housing 4 and the rear case 12 from the front end side to the middle part, and the rear part is inclined obliquely upward toward the rear.
Further, a flange portion 15 is provided at the rear end of the intermediate case 11 so as to be overlapped with the front end surface of the rear case 12 and joined via a bolt 14.

As described above, the upper wall 1 of the intermediate case 11
3 is largely bent obliquely upward toward the rear, and when the front loader 8 or the backhoe 9 is used, stress concentrates on this bent portion. For this reason, FIGS. 2, 3 and 4
As shown in FIG.
Is provided. The reinforcing plate 16 is made of a casting (FC) for facilitating manufacture (compared to the case of forming with a sheet metal).
D). The front wall 17 of the reinforcing plate 16 is overlapped with the upper wall 13 of the intermediate case 11 at the rear side of the intermediate portion, so that the bolt 1
8. Fixed via nuts 19, rear wall 20 is superimposed on flange 15 of intermediate case 11 and bolts 21
The intermediate portion wall 23 is fixed via a nut 22, and the intermediate portion wall 23 is inclined obliquely upward toward the rear corresponding to the inclined portion 13 a at the rear of the upper wall 13 of the intermediate case 11.

On the side of the intermediate wall 23 of the reinforcing plate 16 facing the inclined portion 13a at the rear of the upper wall 13 of the intermediate case 11, a head of a bolt 14 for joining the intermediate case 11 and the rear case 12 is provided. A concave portion 24 for avoiding interference, and a bulging portion 26 formed on the inclined portion 13a for avoiding interference with the head of the bolt 25 in the transmission case 5.
Recess 27 is formed to avoid interference with
The reinforcing plate 16 can be arranged as close to the outer surface of the intermediate case 11 as possible.

The front surface of the intermediate case 11 and the front case 1
The rear surface is superposed and joined, and a flat reinforcing plate 28 extending from the intermediate case 11 to the front case 10 is provided on the upper surface side of the joined portion. The reinforcing plate 28
Are fixed to the upper walls of the intermediate case 11 and the front case 10 via bolts. At the rear of the vehicle body 5, a three-point link mechanism 29 for mounting a work machine such as a rotary so as to be able to move up and down freely.
The lower link 3 of the three-point link mechanism 29 is provided.
6 includes a square tube 31 and a square member 32 that can be slidably inserted from one end of the square tube 31 as shown in FIGS. And the square member 32 is formed with a number of holes through which the pins 33 can be inserted, so that the length of the lower link 30 can be adjusted.

Thus, when the rear end of the lower link 30 is attached to the machine frame of the backhoe 9 when the backhoe 9 is attached, the distance between the attachment points of the lower link 30 differs between when the rotary is attached and when the backhoe is attached. When the backhoe 9 is mounted, the lower link 30 can be removed and mounted in another place when the backhoe 9 is mounted. Therefore, the lower link 30 can be made compact, and can also be used as a large, medium or small tractor.

FIG. 8 shows a second embodiment, in which the reinforcing plate 16 is formed of an SS material (SS400). This is to disperse the stress concentration by providing a reinforcing plate 16 of a material that is larger than the elastic coefficient of the transmission case 5, that is, hardly distorted.

[0014]

According to the present invention, the stress concentration at the shape-changed portion is reduced by the reinforcing plate provided at the shape-changed portion of the transmission case. Even when the front loader and the backhoe are mounted using the current transmission case, sufficient vehicle body strength can be satisfied.

[Brief description of the drawings]

FIG. 1 is an overall side view.

FIG. 2 is a sectional view taken along line AA of FIG. 4;

FIG. 3 is a sectional view taken along line BB of FIG. 4;

FIG. 4 is a front view of a main part.

FIG. 5 is a plan view of a reinforcing plate.

FIG. 6 is a side view of the lower link.

FIG. 7 is a plan sectional view of the lower link.

FIG. 8 is a side sectional view of a main part showing a second embodiment.

[Description of Signs] 5 Transmission case 6 Body 16 Reinforcement plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 1-1157229 (JP, U) JP-A 54-13501 (JP, Y2) JP-A 63-36822 (JP, Y2) (58) Field (Int.Cl. ⁷ , DB name) B62D 49/00 F16H 57/02 511

Claims (1)

(57) [Claims] An outer wall portion of a transmission case (5) constituting a tractor vehicle body (6) changes shape.
Of the part where the stress concentration occurs by dispersing and relaxing the stress concentration
A tractor body structure provided with a reinforcing plate (16) along the outer surface of the transmission case (5).