JPH07223547A - Car body structure for agricultural tractor - Google Patents

Abstract

PURPOSE:To provide the car body structure of an agricultural tractor which can connect a steering box with high strength and can improve the strength of a frame housing. CONSTITUTION:A steering box 12 is connected at the front part of a frame housing 10 made of seat metal laid over a main clutch case 5A at the car body front part and a transmission case at the car body rear part, and a longitudinal wall shaped rib member 13 is connected integrally at the front part of the frame hoosing 10, and the rib member 13 is connected with a main clutch case 5A, and the steering box 12 is connected over the rib member 13 and the upper surface of the frame housing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure of an agricultural tractor in which a steering box is connected to a front portion of a sheet metal frame housing that is laid across a main clutch case in the front portion of a vehicle body and a mission case in the rear portion of the vehicle body. .

[0002]

2. Description of the Related Art Conventionally, in the vehicle body structure of this type of agricultural tractor, the steering box has only been directly connected to the frame housing by fasteners such as bolts.

[0003]

However, in the above-described conventional structure, a large force is applied to the frame housing when heavy load work is performed. Therefore, the frame housing needs to have a fairly solid structure, and the frame housing must have a very strong structure. When the housing is stressed and deformed, the bolts or the like that directly connect the steering box to the frame housing may be loosened. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle body structure of an agricultural tractor capable of connecting a steering box with high strength and also increasing the strength of a frame housing.

[0004]

In order to achieve the above-mentioned object, the vehicle body structure of an agricultural tractor according to the present invention has the structure described above, in which a rib member having a vertical wall shape is integrally formed at the front portion of the frame housing. In addition to the connection, the rib member is connected to the main clutch case, and the steering box is connected across the rib-shaped member and the upper surface of the frame housing. The operation and effect of this characteristic configuration are as follows.

[0005]

That is, the rib member integrally connected to the front portion of the frame housing in a vertical wall shape reinforces the frame housing by itself, and the steering box is connected between the rib member connected to the main clutch case and the upper surface of the frame housing. Therefore, it is possible to connect the steering box with higher strength than the case where the steering box is connected only to the upper surface of the frame housing.

[0006]

Therefore, the strength of the frame housing against a heavy load can be made extremely high by the simple modification of providing the rib member having the vertical wall shape, and the steering box is connected to the rib member and the upper surface of the frame housing. That is, the connection direction can be different for each of the rib member and the frame housing, so even if the connection is bolted,
Even if the frame housing is deformed due to stress, it is possible to make it difficult for the bolt to loosen and the problem that it will not occur.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 8 show an agricultural tractor. This agricultural tractor is equipped with a vehicle body 3 movably supported by a pair of left and right front wheels 1, 1 and rear wheels 2, 2 equipped with an engine 4, a main clutch 5, a mission case 6, a boarding control section 7, and the like. Are configured.

A propeller shaft 8 extending from the main clutch 5 toward the rear of the vehicle body is interlocked with a mission case 6 arranged at the rear portion of the vehicle body, and the shift output from the mission case 6 is transmitted to the rear axle case. It is configured to be transmitted to the rear wheels 2 and 2 via the front wheel drive transmission shaft 9 extending forward from the transmission case 6 and the front axle case to the front wheels 1 and 1. ing.
The propeller shaft 8 and the front-wheel drive transmission shaft 9 are arranged so as to pass through the inside of a frame housing 10 made of a metal plate that extends over the case 5A of the main clutch 5 and the transmission case 6. That is, the frame housing 10 is formed to have a downward U-shaped cross-section, and its rear end is bolted to the mission case 6 and its front end is bolted to the main clutch case 5A. More specifically, the left and right side walls at the front end of the frame housing 10 are provided with connecting tongue portions 10a, 10a extending above the upper surface.
The main clutch case 5A is sandwiched by a, and the connecting tongue portions 10a, 10a and the side wall below the connecting tongue parts 10a, 10a are connected to the main clutch case 5A from the lateral outside by a plurality of bolts. Then, the steering handle 11 is arranged in the boarding control unit 7, and the steering box 12 continuously provided at the lower end of the handle shaft of the steering handle 11.
Is bolted to the frame housing 10 from above while being mounted on the upper wall surface of the frame housing 10. Further, near the left and right end edges of the upper wall surface of the front part of the frame housing 10, the connecting tongue pieces 10a,
Rib members 13 and 14 made of plate members welded to 10a are arranged in a vertical wall shape and welded. These rib members 13,
The front end of 14 is bent inwardly in a plan view, and the refracting portions 13a, 14a and the main clutch case 5A are brought into contact with the rear surface portion of the main clutch case 5A. It is bolted. Then, the rib member 13 on the left side and the left side surface of the steering box 12 are brought into contact with each other, and the rib member 13 and the steering box 12 are bolted to each other at two positions above and below the outer left side. The upper edge portion of the left rib member 13 is formed in a shape in which a middle portion in the front-rear direction is recessed downward, and a sector shaft 15 for mounting the pitman arm 12A from the steering box 12 is formed in the recessed portion 13A. It is arranged so that The right rib member 14 is
It is formed in the shape of a right triangle when viewed from the side.

On the left and right lateral wall surfaces of the frame housing 10, a pair of front and rear connecting stays 17 and 18 for mounting and fixing the step plates 16 and 16 are welded and protruded.
The rear end portions of the left and right step plates 16 and 16 bolted to the connecting stays 17 and 18 are bolted to the pair of left and right fenders 19 and 19 for the rear wheels 2 and 2, respectively. On the other hand, the step plates 16 and 16
The front side of the angle member 20 has an inclined surface that becomes higher toward the front.
It is placed and connected to. The angle member 20 is bolted to the upper ends of the bent portions 13a and 14a of the rib members 13 and 14, respectively. And each step board 16, 1
A brake pedal (not shown) is provided at the inclined surface portion of No. 6
Grooves 16b, 16c through which the clutch pedal 22 is inserted
Is formed. Further, a reinforcing plate 21 welded to the lower surface of the step plate 16 is bolted to the connecting stay 17 located in front of the step plate 16 together with the step plate 16. The reinforcing plate 21 is formed by bending a plate member so as to have a horizontal surface portion welded to the step plate 16 and a rearward descending inclined surface portion that functions as a stopper of the brake pedal and the clutch pedal 22. A buffer rubber 23 for buffering the contact of the brake pedal and the clutch pedal 22 is fixed to the rearwardly inclined surface portion of the reinforcing plate 21. Accordingly, since the reinforcing plate 21 is also used as a stopper for the brake pedal and the clutch pedal 22, it is not necessary to provide a dedicated stopper (contact), and due to the bending structure of the reinforcing plate 21, the supporting structure for the step plate 16 and the above The strength as a stopper is increased.

As shown in FIG. 8, in this agricultural tractor, a cabin 24 for separating the boarding control unit 7 from the outside is detachably provided. The mounting structure of the cabin 24 will be briefly described below. A center pillar 27 having a U-shape facing downward and viewed from the front, which also serves as a support member for the engine bonnet 25 and a mounting member for the fuel tank 26, is connected to the angle member 20. A pin hole 29 for inserting a connecting pin 28, which is projected downward, at the lower edge of the front surface of the cabin 24 in each of the member 20 and the central portion of the center pillar 27.
Are formed. Although not shown, the cabin 24
Connecting pins are also projected downward on the lower edges of the left and right side surfaces and the lower edge of the rear surface, and pin holes for inserting these connecting pins are formed in the step plate, the rear cover, or the fender. There is. As described above, when the cabin 24 is mounted on the vehicle body 3, the predetermined cabin 24 can be installed simply by inserting the connecting pins into the pin holes provided in the vehicle body, and then fastening the bolts or disconnecting the connecting pins. Cabin 2 by stopping
4 can be attached to the vehicle body 3.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a frame housing and the like of an agricultural tractor.

FIG. 2 is a plan view showing a frame housing and the like of an agricultural tractor.

FIG. 3 is a perspective view showing a frame housing and the like of an agricultural tractor.

FIG. 4 is a side view showing the vicinity of the connecting portion of the steering box.

FIG. 5 is a rear view in vertical section showing the vicinity of the connecting portion of the steering box.

FIG. 6 is a plan view showing the vicinity of a connecting portion of a steering box.

FIG. 7 is an overall side view showing an agricultural tractor.

FIG. 8 is a partially cutaway front view showing a cabin mounting structure in an agricultural tractor.

[Explanation of symbols]

 5A Main clutch case 6 Mission case 10 Frame housing 12 Steering box 13 Rib member

Claims (1)

[Claims] 1. A main clutch case (5A) at a front portion of a vehicle body
And a steering box (12) connected to the front part of a frame housing (10) made of sheet metal, which is installed over the transmission case (6) at the rear part of the vehicle body, the frame housing (10) A rib member (13) in the form of a vertical wall is integrally connected to the front part of the vehicle, and the rib member (13) is connected to the main clutch case (5A), and the rib member (13) and the frame housing (10) A vehicle body structure of an agricultural tractor in which the steering box (12) is connected to the upper surface.