JPH0346082B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a small and lightweight agricultural vehicle.

(b) Conventional technology The technology that has made it possible to attach a working machine to the rear and abdomen of a tractor is disclosed in Japanese Utility Model Application Publication No. 56-26515,
The technique described in Japanese Utility Model Application Publication No. 56-108409 is known to the public.

Furthermore, a technology that allows work equipment to be attached to the front and rear parts of a tractor is known, as disclosed in Japanese Patent Application Laid-Open No. 57-99106.

(c) Problems to be solved by the invention Conventionally, tractors have been mainly used as agricultural work vehicles, but tractors are too heavy and cannot be used for lawn management or field work in gardens, golf courses, etc. There was a problem that it could not be used because the field surface was scraped by the tires.

Taking these points into consideration, the present invention relates to an agricultural work vehicle that is small and lightweight, and that allows work equipment such as a rotary mower to be attached to the front, rear, and abdomen of the vehicle.

Even if the work equipment mounting device is installed in each part in this way,
A hot water pressure cylinder for raising and lowering the work equipment had to be installed accordingly, which caused an increase in costs.

However, the work equipment is not always installed, and even if it is installed, only one of the hydraulic cylinders is used for raising and lowering the work equipment, and the other hydraulic cylinders are idle, resulting in waste. It is.

In the present invention, only one hydraulic cylinder is provided,
From this, links and wires were connected to drive other working machines, eliminating waste.

(d) Means for solving the problems The problems to be solved by the present invention are as described above.
Next, means for solving the problem will be explained.

Main frame right 27 and main frame left 28
A body frame is constructed, a seat 5 is arranged on the body frame, an engine 7 is arranged at the rear of the seat 5, and a front work machine mounting device, an abdominal work machine mounting device, a rear work machine mounting device and 3 are installed. In an agricultural work vehicle equipped with a position work equipment mounting device, one hydraulic cylinder 75 is arranged on the side of the engine 7,
From the hydraulic cylinder 75, an arm 71 and a link 7 are connected to the abdominal work machine mounting device and the rear work machine mounting device.
2, the lifting force is transmitted to the front working machine mounting device via a wire 19, and a front PTO shaft 18 is disposed in front of the engine 7.

(E) Embodiment The problems to be solved by the present invention and the means for solving them are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

Fig. 1 is an overall side view of the agricultural working vehicle of the present invention, Fig. 2 is an overall side view with the cabin 1 and vehicle body 2 removed, Fig. 3 is a plan view of the same, and Fig. 4 is a front working machine attached. FIG. 5 is an enlarged side view of the front top link bracket 38 of the device; FIG. 5 is an enlarged plan view, and FIG. 6 is an enlarged plan view.

A vehicle body 2 integrally molded from an iron plate or glass fiber resin is mounted and fixed on the frame, and a cabin 1 which can be rotated forward and backward is further mounted and fixed on the vehicle body 2.

The entire cabin 1 may be made of transparent resin,
It can also be made of resin or iron plate with windows on all sides.

An engine 7 is mounted and fixed on a frame at the rear of the fuselage, and a seat 5 is fixed in the center. Operator 6 is sitting on seat 5. An operating column 3 is provided at the front of the machine body, and a steering handle 4 is provided upright from the operating column 3.

A front top link and front lower links 10 and 11 are provided toward the front of the machine body, and constitute a front work machine mounting device.

In FIG. 1, a front dozer 8 is installed. The working machine is raised and lowered by the vertical movement of this front lower link 11. In the present invention, as shown in FIG. I'm lifting it up. The abdomen in the center of the fuselage is equipped with an abdominal work equipment attachment device and is equipped with a rotary mower and the like.

The rotary mower 9 is suspended by a hanging link 9c, and is moved up and down by bell crank links 9a and 9b. This bell crack link 9a,
Of 9b, 9a is pivotally supported by an arm 83 in FIG. 2, and is moved up and down as the hydraulic cylinder 75 expands and contracts.

A rear top link 12 and rear lower links 13, 13 are also protruded from the rear of the machine body, and constitute a rear working machine mounting device.

A rotary mower, a reel mower, a rotary tilling device, etc. are attached to the rear working machine attachment device. 14, 14 are front wheels, and 15, 15 are rear wheels.

Let me explain the frame structure of this agricultural work vehicle.

The frame in the front-rear direction is composed of a right main frame 27 and a left main frame 28. The rear part of the right main frame 27 is bent at a right angle, and is brought into contact with and welded to the left main frame 28.

Main frame right 27 and main frame left 28
are both constructed of pipes, and their front ends are fixedly abutted to the front top link brackets 38L, 38R from the side. The center pin frame 37 is a plate bent downward into a U-shape, and is attached to the front top link bracket 3.
The rear parts of 8L and 38R are fixed in the center, and are also reinforced by this.

Further, a shaft support case 22 for a power transmission shaft from the front PTO shaft 18 is fixedly provided in the center of the center pin frame 37 in the front-rear direction. Pivot case 2
Bearing fixing plates 49, 49 are welded and fixed to the front and rear of 2. The right main frame 27 and the left main frame 28 are slightly wider in the center, and the front step frame 29 and the rear step frame 30 are fixedly installed in that area. 31 and 32 are the right and left step frames.

The mounting plates 23, 23 are protruded from the transmission case fixing frame 24, and the transmission case 4 is
The front end of 0 is fixed from the left and right.

At the rear thereof, two base frames 52, 52 of the engine frames 45, 45 are fixedly installed in parallel to the left and right.

Mission case mounting plates 25R and 25L protrude downward from slightly upwardly bent portions of the main frames right 27 and left 28. A rear axle housing portion of the transmission case 40 is fixed between the transmission case mounting plates 25R and 25L.

Also, this transmission case mounting plate 25R, 25
Diagonally rearward from L, rear lower link 13L,
Brackets 26L and 26R of 13R protrude slightly inward, and these brackets 26L and 26R
Rear lower links 13L and 13R are fixedly installed.

Further, a hydraulic cylinder pivot 55 is welded and fixed so as to wrap around the left side of the main frame 28, and the front end of the hydraulic cylinder 75 is pivotally supported by the hydraulic cylinder pivots 50, 50.

The rear end of the piston of the hydraulic cylinder 75 is the arm 7
1, and the arm 71 is fixed to the rotation shaft. The rotation shaft is loosely fitted into a pivot tube 42 on support plates 41, 41 protruding from a bent portion of the main frame 27. Lift arm 70 from the rotation axis
Rear lower links 13L and 13R are moved up and down from L and 70R via lift links 16L and 16R.

Further, a link 72 is provided to protrude forward from the arm 71, and the link 72 is connected to the arm 80 of the intermediate pivot tube 82. The rotation of the arm 80 is caused by the rotation of the arms 81L and 8 through the intermediate pivot tube 82.
This has been reported to 1R and 83. The arm 83 serves as a lift arm for a work machine attached to the abdomen, and is connected to the bell crank 9a in FIG. 1. Also, wire 19 is attached to arms 81L and 81R.
The rear ends of L and 19R are connected, and wire 1
9L and 19R extend forward and are connected to the lower link connecting body 88 via guide pulleys 73 and 74 between the front top link brackets 38 and 38.

As shown in FIG. 4, a front PTO shaft 18 is arranged ahead of the engine 7, and engine power is transmitted from the front PTO shaft 18 to a shaft 76. That is, the front in Figure 3
The rotation of engine 7 to PTO gearbox 17 is V.
The power is transmitted by a belt, and power is transmitted from the front PTO gear box 17 to the shaft 76 via the front PTO shaft 18 and the coupling 63, and from there, the power is transmitted to the front working machine via the universal joint shaft 35.

Further, by bringing the mounting position of the guide pulley 74 and the front top link 10 closer together and replacing both the mounting holes 38a and 38b, it is possible to change the rotation width of the front-mounted work machine. 7
7 is a bearing of the shaft 76, and 78 is a check link.

(F) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, the single hydraulic cylinder 75 can transmit lifting force to three positions: the front work equipment mounting device, the abdominal work equipment mounting device, and the rear work equipment mounting device, so the entire traveling work vehicle becomes compact. In particular, the hydraulic lifting mechanism can be simplified. Additionally, the front and rear dimensions of mobile work vehicles have become smaller.

Secondly, it is impossible to use a work machine in three positions at once, so it is wasteful to provide three hydraulic cylinders, but according to the present invention, one hydraulic cylinder can do all the work. Therefore, the cost can be reduced and the structure can be simplified.

Thirdly, since we used wires to move the front work equipment up and down, we were able to construct a lightweight transmitter for transmitting the lifting force of the work equipment located at a distance from the front and back. Although many relay points are required, the number of relay points can be reduced.

Fourth, because the hydraulic cylinder is interposed between the rear wheel and the main frame, links and arms can be configured centering on the abdominal and rear working equipment, which are most likely to be used, making it possible to reduce the frequency of use. This made it possible to locate the hydraulic cylinder in the correct position. This reduces wear on the links and arms, but there are many troubles such as wires coming off, so the links and arms transmit rotational force to the parts that are mainly used, reducing trouble.

[Brief explanation of drawings]

Fig. 1 is an overall side view of the agricultural working vehicle of the present invention, Fig. 2 is an overall side view with the cabin 1 and vehicle body 2 removed, Fig. 3 is a plan view, and Fig. 4 is a front working machine attached. An enlarged side view of the front top link bracket of the device; FIG. 5 is also an enlarged plan view;
FIG. 6 is also an enlarged plan view. 5... Seat, 7... Engine, 10... Front top link, 11... Front lower link, 12... Rear top link, 13... Rear lower link, 19... Wire, 27... Main frame right, 28... Main frame left, 71...
Arm, 72...Link, 75...Hydraulic cylinder, 83...Arm (abdominal lift arm).

Claims (1)

[Claims] 1 Main frame right 27 and main frame left 2
8 constitutes a body frame, a seat 5 is arranged on the body frame, an engine 7 is arranged at the rear of the seat 5, and a front work machine mounting device, an abdominal work machine mounting device, a rear work machine mounting device are installed. In an agricultural work vehicle equipped with a three-position work equipment mounting device, one hydraulic cylinder 75 is arranged on the side of the engine 7, and the hydraulic cylinder 75 is connected to the abdominal work equipment mounting device and the rear work equipment mounting device. The lifting force is transmitted via the arm 71 and the link 72, and the lifting force is transmitted to the front work machine mounting device via the wire 19.
A work equipment lifting device for an agricultural work vehicle, characterized in that a front PTO shaft 18 is arranged in front of an engine 7.