JPS63170175A - Supporting structure of four-column frame for tractor - Google Patents

Abstract

PURPOSE:To disperse the extent of load to be imposed on a four-column frame as well as to aim at lightweightiness in this frame, by supporting the lower part of a front column forming the four-column frame surrounding a driver's seat of a tractor with a side member and a cross frame each in a car body. CONSTITUTION:A four-column frame erected so as to surround a driver's seat of a tractor is constituted of each of front and rear columns 7 and 8 to be set up each in front and in the rear of the drive's seat and a symmetrical pair of intermediate column 9 connecting an interval between upper ends of these front and rear columns 7 and 8. In this case, the front column 7 is formed from one upper column 10 formed in U-shaped form and two lower columns 11. And, a connecting piece 14 for to be connected to a connecting part 18a at a tip of a side member overhanging from a steering column 17 is projectingly installed in a part 11a of the lower column 11 extending in the same direction as a vertical part of the upper column 10. And, a connecting piece 15 to be locked to an edge of a cross frame 19 is projectingly installed in a parts 11c extending in the rear of the lower column 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support structure of a four-post frame erected to surround a driver's seat of a tractor.

[Conventional technology]

The four-post frame consists of an inverted U-shaped front column installed in front of the driver's seat, an inverted U-shaped rear column installed in the rear area of the driver's seat, and the left and right ends of the upper ends of these columns. The front strut has its lower end supported at two places on the left and right of the front of the vehicle body, and the rear strut has its lower end supported at the rear of the vehicle body. It is supported in two places on the left and right sides.

[Problem that the invention seeks to solve]

Therefore, when a load is applied to a four-post frame, there are four support points, so a relatively large load is applied to the support parts of the front and rear pillars, so it is necessary to use thick members for the support parts. are doing.

The present invention has been made in view of the above points, and eliminates the need to thicken the support part of the 4-post frame to the vehicle body, and reduces the weight of the 4-post frame by constructing the 4-post frame with pillars having a small cross-sectional area in terms of strength. The purpose is to provide a support structure that can.

[Means for solving problems]

The structure of the present invention for achieving the above object is configured to surround a driver's seat with an inverted U-shaped front column, a rear column, and an intermediate column connected between them. A tractor is provided with a four-post frame that is erected and supported by the vehicle body, and a lower part of a front column constituting the four-post frame is fixed to a steering column, and a side member extends to both sides and extends in the longitudinal direction of the vehicle body. It is characterized by being supported by a cross frame fixed to the main frame and extending in the left and right direction.

[Effect]

When a load is applied to a four-post frame, the load is distributed between the four support parts on the left and right of the front post and the left and right support parts of the rear post. The four-post frame is lightweight.

〔Example〕

Figure 1 is an overall perspective view of the tractor, Figure 2 is a side view showing its main parts, Figure 3 is an exploded perspective view of the four-post frame, and Figure 4 is an exploded perspective view of the four-post frame.
The figure is a perspective view of the steering column section.

The tractor 1 includes an engine in the front part of the vehicle body, a steering handle 2 and a driver's seat 3 in the middle part, and front wheels 4 and rear wheels 5 on the left and right sides of the front and rear parts.

This tractor 1 has four wheels surrounding the driver's seat 3.
A column frame 6 is erected.

This four-post frame 6 will be explained below.

As shown in FIGS. 1 to 3, the four-pillar frame 6 includes a front column 7 erected in the front part of the driver's seat 3, a rear column 8 erected in the rear part, and a front column 7 and the rear column 7. It is composed of a pair of left and right intermediate columns 9 that connect the upper ends of the columns 8. The front column 7 is an inverted U-shaped column, and is composed of one upper column 10 and two lower columns 11, as shown in FIG. The upper support lO is an inverted U-shaped support with a box-shaped cross section, and the lower support 11 is a box-shaped support with the same cross-sectional area as the upper support 10, and has a connecting portion provided at the lower end of the upper support 10 at its upper end. 10a is inserted, and the lower struts 11 are connected to the left and right lower end portions of the upper strut 10, respectively, with bolts. The lower strut 11 is attached to the vehicle body, and a portion 11 extends in the same direction as the vertical portion of the upper strut 10.
a, a portion 11b that is bent from the lower end of this portion 11a and extends rearward and obliquely downward, and a portion 11c that is further bent from the lower end of this portion 11b and extends horizontally rearward. The portion 11b extending diagonally downward to the rear is disposed along the side edge of the cover plate 13 that stands diagonally forward at the front end position of the step plate 12 disposed at the front lower part of the driver's seat 3, and extends horizontally to the rear. A portion 11c extending to is horizontally disposed below the side edge of the step plate 12.

The front strut 7 is attached to the vehicle body in the following manner.

That is, the inner surface of the upper end of the portion 11a extending in the same direction as the vertical portion of the upper strut 10 has a cross section for connecting to a connecting portion 18a at the tip of a side member 18 that laterally overhangs from the steering column 17. A box-shaped connecting piece 14 projects diagonally rearward, and on the inner surface of the rear end of the portion lIC extending horizontally rearward, there is a cross-sectional inverted cross-section for fixing to the end of a cross frame 19, which will be described later. A U-shaped connecting piece 15 is provided to protrude inward.

A main frame 16 extending in the front-rear direction is provided in the center of the vehicle body in the left-right direction, and a steering column 17 is provided upright on the main frame 16. A side member 18 having a box-shaped cross section that extends to both sides is fixed. A connecting piece 14 protruding from the upper end of the lower strut 11 of the front strut 7 is fitted into the connecting portions 18 a provided at both ends of the side member 18 .
The upper end portion of the side member 18 is connected and fixed to the side member 18 with a bolt. Further, a cross frame 19 extending in the left-right direction is disposed below the main frame 16 in front of the driver's seat 3.
It is fixed to the main frame 16. This cross frame 19 is a member having an inverted U-shaped cross section, both ends of which are horizontal and the middle part of which is concave downward. The step plate 12 is placed on the cross frame 19 and is supported and fixed thereon. The lower support columns 11 are connected and fixed to both ends of this cross frame 19 with bolts.

As shown in FIGS. 1 to 3, in the rear strut 8, an upper strut 22 extending vertically is connected and fixed to the upper end of a lower strut 21 that is erected and fixed to the left and right rear axle housings 20. A horizontal support 23 is connected between the parts.

In addition, in Figure 2, 24 is the mission case, 25 is the PT
On the O axis, 26 is a hydraulic cylinder.

An intermediate column 9 extending horizontally in the front-rear direction is connected between the left and right ends of the upper ends of the front column 7 and the rear column 8 to form a four-column frame 6 so as to surround the driver's seat 3.

As described above, the four-post frame 6 of the present invention has a rear support column 8.
The lower end of the front column 7 is supported at two places on the left and right rear axle housings 20, and the lower end of the front column 7 is supported on the steering column 1.
The four-pillar frame 6 Even when a load is applied to the four-column frame 6, the load is distributed to the six supporting portions, so columns with a small cross-sectional area can be used in terms of strength, and the weight of the four-column frame 6 can be reduced.

〔Effect of the invention〕

As explained above, according to the present invention, the lower part of the front column constituting the four-post frame is fixed to the steering column and extends to both sides of the side member, and the main frame extends in the longitudinal direction of the vehicle body. By supporting the four-post frame with a cross frame extending in the left-right direction, the load applied to the four-post frame is dispersed, and the four-post frame can be composed of pillars with a small cross-sectional area, making it possible to reduce the weight of the four-post frame.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall perspective view of the tractor, Fig. 2 is a side view showing its main parts, and Fig. 3 is a
FIG. 4 is an exploded perspective view of the column frame portion, and FIG. 4 is a perspective view of the steering column portion. 1 is a tractor, 2 is a steering handle, 3 is a driver's seat, 4 is a front wheel, 5 is a rear wheel, 6 is a 4-post frame, 7 is a front column, 8 is a rear column, 9 is an intermediate column, 10.22 is an upper part Support column, 10a is a connecting part, 11°21 is a lower support, 12 is a step plate, 13 is a cover plate, 14.15 is a connecting piece, 16 is a main frame, 17 is a steering column, 18 is a side member, 18a is a connecting part , 19 is a cross frame, 2
o is the rear axle housing, 23 is the horizontal support.

Claims (1)

[Claims] It has a four-post frame that surrounds the driver's seat with an inverted U-shaped front column and rear column and an intermediate column connected between them, and the front column and rear column are erected and supported by the vehicle body. In the tractor, the lower part of the front column constituting the four-post frame is fixed to the steering column and extends to both sides, and the cross frame is fixed to the main frame extending in the front-rear direction of the vehicle body and extends in the left-right direction. 4 of a tractor characterized by being supported by
Column frame support structure.