JPS6134931Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention comprises a machine frame by connecting a pair of left and right frames facing in the front-rear direction with a horizontal frame at appropriate intervals in the front-rear direction, and a front engine, a front engine,
This aims to increase the strength of the frame structure of agricultural tractors on which a clutch housing and a rear rear wheel transmission case are mounted, by effectively utilizing the existing rear wheel transmission case and using inexpensive means. .

The above-mentioned agricultural tractor adopts a configuration in which various devices such as the engine, clutch housing, and rear wheel transmission case are mounted and supported on the machine frame, and the engine, clutch housing, and rear wheel transmission case are connected to each other.
Compared to a model that also uses this as a machine frame,
It is easy to assemble and disassemble various devices, which is advantageous in terms of production and inspection and adjustment.Moreover, the machine frame is constructed in the form of a ladder, combining front and rear frames and horizontal frames. As a result, it is easy to increase the strength while being lightweight, but there are problems as described below.

That is, since the front and rear of the machine frame are connected by the engine and the rear wheel transmission case, the front and rear parts are strong in strength, but the middle part is weak in strength against twisting and bending. Therefore, in order to sufficiently increase the strength of the intermediate part, the front and rear frames must be constructed using heavy members with a considerably large cross-sectional area. There were problems in the manufacturing process, such as the need to transport a heavy frame using the same equipment.

The present invention has been made with the above-mentioned circumstances in mind, and in the agricultural tractor having the above-mentioned structure,
A plurality of vertical frames are erected on the front and rear frames, and each of the vertical frames is positioned near the horizontal frame, and the upper end of each vertical frame erected on the front and rear frames and the It is characterized in that an auxiliary frame facing in the front-rear direction is connected and supported between the upper parts of the rear wheel transmission case.

In other words, even when viewed from the side, the machine frame is ladder-shaped, combining the front and rear frames, vertical frame, rear wheel transmission case, and auxiliary frame. In other words, it is possible to provide each frame with the desired strength while using lightweight members with small cross-sectional areas. Furthermore, according to the present invention, since the rear wheel transmission case is used as a frame having the same function as the vertical frame, the desired objective can be achieved while reducing the number of vertical frames required.
In the end, it is an inexpensive structure that uses the rear wheel transmission case as a frame component, avoiding the problems mentioned above when using heavy front and rear frames with a large cross-sectional area.
Successful manufacturing of the frame structure has led to agricultural tractors.

Furthermore, since the vertical frame is connected in the vicinity of the horizontal frame, a frame with a rigidly connected structure and strong strength as a whole can be obtained.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 illustrates a side view of a four-wheel drive agricultural tractor, where 1, 1 is the front wheel whose direction is changed;
3 is a rear wheel, 3 is an engine provided at the front of the aircraft, 4 is a clutch housing directly connected to the engine 3,
5... is a group of hydraulic pumps that are interlocked with the engine 3 via a transmission clutch (not shown) in the clutch housing 4, 6 is a rear rear wheel transmission case in which a differential transmission mechanism, etc. is installed, and 7 is a rear wheel transmission case. PTO axis used to drive attachment work equipment,
8 is a soft arm used to raise and lower the attachment working device.

Next, a frame structure for mounting and supporting various devices such as the engine 3, clutch housing 4, rear wheel transmission case 6, etc. will be described.

That is, the machine frame is constructed by connecting a pair of left and right frames 9, 9 facing in the front-rear direction at four locations at appropriate intervals in the front-rear direction by horizontal frames 10. Further, with respect to the front and rear frames 9, 9, a horizontal frame 10...a vertical frame 11 erected at three locations in the vicinity extends between the upper end portions and the upper portion of the rear wheel transmission case 6 in the front-rear direction. Auxiliary frames 12, 12 are connected and supported to reinforce the machine frame. In the illustration, a frame made of pipe material bent in an inverted U-shape is used to connect the two vertical frames 11, 11 located on the front side and the front side part 1 of the auxiliary frame 12.
2a, and the rear side portion 12 of the remaining vertical frame 11 and auxiliary frame 12.
b are constructed using different members.

[Brief explanation of the drawing]

The drawings show an embodiment of the agricultural tractor according to the present invention; FIG. 1 is a side view of the agricultural tractor, FIG. 2 is a side view of the frame structure, and FIG. 3 is a plan view of the frame structure. 3...Engine, 4...Clutch housing,
6... Rear wheel transmission case, 9... Front and rear frames, 1
0...Horizontal frame, 11...Vertical frame, 12
...Auxiliary frame.

Claims (1)

[Scope of utility model registration request] A pair of left and right frames 9, 9 facing in the front and back direction,
An agricultural tractor in which a machine frame is constructed by connecting horizontal frames 10 at appropriate intervals in the longitudinal direction, and a front engine 3, a clutch housing 4, and a rear rear wheel transmission case 6 are mounted on the machine frame. A plurality of vertical frames 11 . . . are erected on the front and rear frames 9, and each of the vertical frames 11 . An agricultural tractor characterized in that an auxiliary frame 12 extending in the front-rear direction is connected and supported between the upper ends of each vertical frame 11 erected on the front and rear frames 9 and the upper part of the rear wheel transmission case 6.