JPS6158330B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention consists of a clutch housing part and a transmission shaft covering part, and is interposed between an engine crankcase and a transmission case to integrally connect the engine and transmission case. This invention relates to a tractor frame connected to a tractor.

Conventionally, such structural parts have been made of cast products, and although they have an extremely strong structure, the parts have complex shapes and are heavy, difficult to manufacture, expensive, and time-consuming to assemble. .

In recent years, agricultural tractors have not only been equipped with a towing machine for towing work, but also include various types of machines that can be used on soft ground, slopes, areas, or uneven ground. There is a demand for the development of compact and lightweight tractors that are equipped with multi-functions unimaginable in the past.In general, tractors developed in response to these types of demands was a cast product that was simply scaled down from a high-output, heavy-duty tractor, so there was a limit to how much it could be made smaller and lighter within the limits of being able to withstand the harsh working conditions of a tractor. In particular, it had the disadvantage that it could not be used for tillage work on soft soil such as wet rice fields.

Under these circumstances, the present invention has been developed to replace conventional cast products with the constraints that the shape of the attached parts to be assembled and the shape of the tractor body required by the work machine to be installed continue to the conventional shape. In comparison, sheet metal materials are extremely effective in reducing size and weight, and there are problems when trying to use this sheet metal material, namely, it is difficult to obtain the required strength compared to cast products. We solved this problem by devising the shape and structure of the sheet metal material, and created a tractor frame that is small, has sufficient strength, is sufficiently lightweight, and is also convenient to use when assembling. The purpose is to obtain.

In order to achieve the above object, the present invention is characterized in that, in the frame of the tractor, the clutch storage portion is formed entirely in a bowl shape from a sheet metal material, and a bowl-shaped opening located on the engine side is provided. A cylinder is formed with a collar-like flange that is integrally bent outward at the edge portion, and further has a small-diameter opening for inserting the transmission shaft in the bowl-shaped bottom portion of the clutch storage portion on the side of the transmission case. forming a section;
A front end edge of a transmission shaft covering portion, which is formed into a cylindrical shape made of sheet metal and has a larger diameter than the outer diameter of the cylindrical portion, is welded to the outer wall of the bowl-shaped bottom portion of the transmission case side of the clutch storage portion. This configuration provides the following effects.

In other words, when constructing a tractor frame using a sheet metal material, which is effective in reducing the weight and size of the entire aircraft, it is impossible to construct a frame with a complicated shape from a single plate, and split plate materials are used. However, in the present invention, when constructing the frame of such a tractor by dividing it, the case is constructed by combining ordinary divided case pieces. In other words, when the entire frame is regarded as a case, the length of the dividing line is increased relative to the case volume by dividing the frame along the dividing plane along the front and back direction, and press processing is performed. Rather than adopting a technology that makes the whole frame easier to use, the clutch storage area and transmission are divided in such a way that the length of the dividing line is shorter than the case volume when the entire frame is considered as a case. By dividing the clutch housing part and the transmission shaft covering part into circular slices, the connection part between the clutch housing part and the transmission shaft covering part can be made into a shape with excellent rigidity against crushing external forces in the radial direction, up, down, left and right. This structure allows the overall strength of the frame to be significantly improved even though it is made of sheet metal. In other words, by dividing the frame into front and rear parts as described above, the degree of freedom in terms of the shape of the clutch storage part structure was increased, and it was possible to form the clutch storage part into a bowl shape. The bottom part of the clutch storage part is welded and connected to the front edge of the transmission shaft covering part connected to the bottom part, so that the crushing strength of the clutch storage part is improved because of its bowl shape, and the crushing strength of the clutch storage part is improved. A partition wall portion formed by the bottom portion of the clutch storage portion is formed at the bottom portion, thereby significantly increasing the rigidity of the entire frame against crushing in the radial direction.

When the frame is constructed by combining divided pieces, when dividing the frame along the dividing plane along the front-rear direction, it is necessary to save the mold, which is extremely expensive in terms of production cost, by dividing the frame into left and right or Generally, the frame is constructed by combining divided pieces of the same shape to have a vertically symmetrical shape, but in the present invention, the frame is constructed by combining the clutch housing part on the front side and the transmission shaft covering part on the rear side. ,
Since it is divided into front and rear parts, its shape has been changed due to the necessity of assembling it with the engine part, installing the clutch operation member, and installing necessary equipment around the engine part. In addition, since the clutch storage part is small in proportion to the surface area of the whole frame, it is not necessary to make it simple horizontally or vertically symmetrical. The power transmission shaft covering part, which can be formed by molding, has a relatively simple shape, and has a relatively large surface area relative to the surface area of the entire frame, can be formed by bending sheet metal, etc. It can be easily manufactured. Therefore, it is possible to manufacture the frame at low cost by using a relatively small mold that only molds the bowl-shaped clutch storage part, while making it easier to assemble the engine part and attach accessories. Therefore, it is possible to manufacture the clutch storage part in a complicated shape that is asymmetrical vertically or horizontally.The above-mentioned vertically or horizontally symmetrical clutch storage part components are molded and then assembled, and then the engine Manufacturing and assembling operations can also be carried out more conveniently than in the case of performing processing for assembly means for parts or attachment means for fixtures.

The clutch storage portion formed in the shape of a bowl has a cylindrical portion provided at the bottom of the bowl shape with an opening for insertion of the transmission shaft, and this cylindrical portion allows the transmission shaft inserted into the small diameter opening to be inserted into the cylindrical portion. This has the advantage of stably holding the clutch operating member fitted therein, thereby facilitating smooth operation.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a four-wheel drive agricultural tractor, in which an engine 1 at the front of the machine body and a transmission case 2 at the rear are connected via a hollow power transmission shaft cover 3 and a clutch housing 4. The rotational output from the engine 1 is transmitted to the transmission case 2 through the clutch housing 4 and the transmission shaft cover 3, where the gears are appropriately changed to drive the front wheels 5 and the rear wheels 7 and 7. 8, and the front and rear working power take-off shafts 9, 9.
As shown in the figure, the crankcase 10 of the engine 1
A substrate 11 of an appropriate thickness with a hole in the center is fastened and fixed to the output side end face of the substrate 1.
Clutch storage part installation boss 12 near the periphery of 1...
... is formed by welding a nut, and
A mounting hole 14 for the starter 13 is provided.

On the other hand, the clutch storage part 4 is formed into a bowl shape by pressing or drawing a plate material, and integrally bending the edge of the opening on the engine 1 side outward to form a collar shape that is approximately equal to the outer diameter of the base plate 11. The bowl-shaped bottom portion of the clutch storage portion is welded to the front end of the hollow transmission shaft covering portion 3, which is also made of a plate material, and a flange 4' is formed thereon. A transmission shaft covering part 3 is provided on the bowl-shaped bottom part.
An opening 4a with a smaller diameter than the welding position is provided, and the propeller shaft 2 as a transmission shaft is inserted into this opening 4a.
A cylindrical portion 4b is integrally provided for fitting into the clutch 0 and holding a clutch operating member, etc. An annular connecting plate 15 is welded and fixed to the collar-shaped flange 4' of the clutch storage portion 4, and the substrate 1
Mounting holes 16 corresponding to the mounting bosses 12 of No. 1...
...is formed.

Further, a portion of the connecting plate 15 is provided with portions 15', 15' that protrude inward from the clutch housing portion 4 than the brim-like flange 4', and these protruding portions 1
5' and 15' by welding nuts to the starter 13.
The mounting boss 17 constitutes...

When the clutch housing 4 and the starter 13 are attached to the base plate 11, a flywheel 18 and a clutch mechanism 19 that mesh with the starter 13 are installed in the clutch housing 4, and the propeller shaft 20 is connected to the transformer through the frame 3. You will be led to Mission Case 2.

Incidentally, although numbers are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of a tractor frame according to the present invention, in which FIG. 1 is an overall side view, FIG. 2 is an exploded perspective view of a main part, FIG. 3 is a vertical sectional side view of a main part, and FIG. FIG. 5 is a sectional view taken along the line - in FIG. 4. DESCRIPTION OF SYMBOLS 1... Engine, 2... Transmission case, 3... Transmission shaft covering part, 4... Clutch storage part, 4'... Flange-like flange, 4a... Small diameter opening, 4b... Cylindrical part, 10... …Crankcase.

Claims (1)

[Claims] 1 Consists of a clutch storage part 4 and a transmission shaft covering part 3, and is interposed between the crankcase 10 of the engine 1 and the transmission case 2 to integrally connect the engine 1 and the transmission case 2. In the frame, the clutch storage portion 4 is formed entirely into a bowl shape from a sheet metal material, and
A flange-shaped flange 4' integrally bent outward is formed on the edge of the bowl-shaped opening located on the engine 1 side, and furthermore, a flange-shaped flange 4' is formed on the bowl-shaped bottom portion of the transmission case 2 side of the clutch storage portion 4. A cylindrical portion 4b is formed with a small-diameter opening 4a through which the transmission shaft 20 is inserted.
A frame for a tractor, in which the front end edge of a transmission shaft covering part 3, which is formed into a cylindrical shape made of sheet metal and has a larger diameter than the outside diameter of the frame, is welded and connected to the frame.