JPS5918946Y2 - Agricultural index vehicle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an agricultural tractor used in a riding-type rice transplanter, and particularly relates to an improved tractor that can be made smaller and simpler.

As a conventionally well-known agricultural tractor, for example,
There are those disclosed in Japanese Patent Application Laid-open No. 119 and Japanese Patent Application Laid-Open No. 53-40921.

In these agricultural tractors, the engine is mounted on the front of the machine body, and the front frame on which the engine is mounted is connected to the transmission case installed at the rear of the frame using a strong cylindrical connection frame made of cast iron. A transmission mechanism, steering box, etc. were installed within this connection frame.

For this reason, the configuration is complicated and large, and not only is it heavy, but it is also difficult to assemble and repair.
It was unsuitable for use as an agricultural tractor, and improvements were desired.

Therefore, the present invention improves the frame placed in the middle between the front frame on which the engine is mounted and the transmission case to simplify the structure while ensuring strength.
It is an object of the present invention to provide an agricultural tractor suitable for use as a riding-type rice transplanter, for example, which can be lightened by making the structure of a steering box and transmission system more convenient.

For this purpose, the agricultural tractor according to the present invention has a transmission case 4 disposed between front wheels 5 and rear wheels 6 as a base body, and a front frame 7 on which an engine 8 is mounted.
An engine 8 is mounted on the front part of the front frame 7, and a predetermined interval is provided above the front frame 7 between the front frame 7 and the transmission case 4 behind the engine 8 mounting position. A support body 33 with open sides for the suspension of the front frame is provided, and the rear part is connected to the transmission case 4 and the front part is connected to the front frame 7, and the steering box 28 is integrally attached to this support body 33. Furthermore, the agricultural tractor is configured such that a power transmission system for transmitting power from the engine 8 side to the transmission case 4 side is provided below the support body 33.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an agricultural tractor, and a rice transplanting machine 3 is connected to the rear of the agricultural tractor 1 via a link mechanism 2. As shown in FIG.

The agricultural tractor 1 includes a transmission case 4 disposed between a front wheel 5 and a rear wheel 6 as a base body.
A front frame 7 serving as an engine stand extends horizontally on the front side of the engine, and an engine 8 is mounted on this.

Behind this engine 8, there is a steering handle 10 that constitutes a driver's seat 9, and various operating levers 11. A seat 12 and the like are provided on a support frame 13 having a U-shaped cross section.

At the rear of the transmission case 4, there are a pair of left and right rear wheel transmission cases 1 extending rearward and diagonally downward from both rear sides of the transmission case 4.
4 is extended, and a rear wheel 6 is attached to the free end side of this transmission case 14. The left and right transmission cases 14, which pivotally support the rear wheel 6, are shaped like a flat gate with respect to the transmission case 4. The left and right rear wheels 6 are connected to each other, and a space is formed between the left and right rear wheels 6.

The power from the engine 8 is transmitted to the belt transmission system 15.
After the power is transmitted to the transmission case 4 through the transmission case 14, the power is transmitted to the rear wheels 6 through the transmission system (not shown) in the transmission case 14, and then to the rice transplanting machine 3 through the propeller shaft.
It is designed to be transmitted to

The link mechanism 2 has two lower links 16 and one upper leaf spring link 17, and one end base of the two lower links 16 is connected to a lower position of the support frame 13 having a U-shaped cross section. It is pivotally attached to the mold, and the rice transplanting machine 3 is connected to the other end via a rolling support frame 18.

Further, a lift arm 19 is swingably installed on the support frame 13, and an upper leaf spring link 17 is disposed at the lower part between the upper end of the lift arm 19 and the upper end of the strut 18a standing upright on the rolling support frame 18. It is constructed almost parallel to the link 16.

Furthermore, a hydraulic cylinder 20 is installed substantially horizontally in the front-rear direction at the lower part of the support frame 13, and a piston 21 of this hydraulic cylinder 20 is linked to swing the lift arm 19.

Further, a spring 22 is diagonally stretched between the free end side of the lower link 16 and the upper part of the support frame 13.

In addition, in the rice transplanting work machine 3, a body frame 23 is rollably connected to a rolling support frame 18 connected to the rear end of the link mechanism 2, and a seedling tank 24 is connected to the body frame 23 with the upper end used for agricultural purposes. It is installed so as to be tilted toward the towing vehicle and move back and forth in the left and right direction, and a float 25 is attached below the body frame 23.

Further, a planting body 26 is disposed facing the seedling outlet at the lower end of the seedling tank 24, and by vertical movement of the planting body 26, seedlings are cut out one by one from the seedling tank 24 and planted in a circle. It looks like this.

In the present invention, as shown in FIG. 2, a steering box 28 of a steering mechanism 27 having a steering handle 10 is disposed between the transmission case 4 and the engine 8.

This steering box 28 connects a protruding frame 32 whose rear end is fixed to the front upper part of the transmission case 4 and extends forward, and a column 29 whose lower end is fixed and attached to the front frenim 7 and stands upright. When viewed from the side, it is integrally attached to a support body 33 whose side surfaces are open.

Therefore, the front frame 7 is integrally reinforced between the transmission case 4 and the steering box 28, and a vehicle body frame is constructed in which a predetermined space is formed below the steering box 28 (between it and the front frame 7). ing.

In the space, a counter shaft of the counter pulley 30, a tension shaft of the tension clutch device 31, etc. that constitute the belt transmission system 15 are arranged.

The riding type rice transplanter configured in this way transmits the power of the engine 8 to the belt transmission system 15, that is, the counterboot 1j30.
After transmitting the power into the transmission case 4 via the tensile clutch device 31 and the like, the power is supplied to the transmission case 14 to drive the left and right rear wheels 6 and drive the vehicle on its own.

When traveling for planting, the link mechanism 2 is operated to hold the rice transplanter 3 at a predetermined height position so that the float 25 slides on the rice field surface, and then the power transmitted to the mission 4 is transmitted to the rice transplanter. By transmitting the information to the working machine 3 and driving while towing it, the seedlings on the seedling tank 24 are planted in a circular pattern.

In addition, when traveling along a headland or driving on the road, the lift arm 19 is swung by extending the piston 21 of the hydraulic cylinder 20, and the rice transplanting machine 3 is hoisted above the rear of the agricultural tractor 1. The train will travel with the train.

In this riding-type rice transplanter, the agricultural tractor according to the present invention is configured as described above, so that the following effects can be obtained.

That is, since the present invention has the above-mentioned configuration, by lifting the front frame 7 upward by the support 33 attached to the transmission case 4, weight reduction can be achieved without reducing the strength. Since it is an open type, inspection, disassembly, or assembly of the power transmission system located below the support body 33 can be easily performed while looking through the open part.
It also has an anti-vibration effect that prevents vibrations from the engine from being transmitted to the transmission.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment in which the agricultural tractor of the present invention is applied to a riding-type rice transplanter, and FIG. 2 is an enlarged side view of the main parts thereof. DESCRIPTION OF SYMBOLS 1...Passenger towing vehicle, 2...Link mechanism, 3...Rice transplanting machine, 4...Mission case, 5...Front wheel,
6... Rear wheel, 7... Front frame, 8... Engine, 27... Steering device, 28... Steering box, 29... Support column, 30... Counter pulley, 31...・Tension clutch device.

Claims (1)

[Scope of utility model registration request] Mission case 4 placed between front wheels 5 and rear wheels 6
The front frame 7 on which the engine 8 is mounted is extended from the front side of the base body, and the engine 8 is mounted on the front part of the front frame 7. In between, a support body 33 with open sides for the front frame suspension is provided above the front frame 7 at a predetermined interval, the rear part of which is connected to the transmission case 4, and the front part of which is connected to the front frame 7. This agricultural tractor has a steering box 28 integrally attached to the support 33, and a power transmission system for transmitting power from the engine 8 side to the transmission case 4 side on the lower side of the support body 33.