JPS6219451Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application The present invention is an invention related to agricultural tractors, especially small special tractors for small lawn management or orchard management.

(b) Prior art Tractors used to manage orchards and lawn areas often operate on slopes, so they are required to have a low floor and be stable against slopes, and are also used for weeding and mowing overgrown lawns. Since the purpose is to feed the soil, it is necessary to be able to drive a rotary mower, reciprocating mower, rotary tiller, etc. with the rear PTO shaft or the front PTO shaft.

Also, for working in orchards and lawns, it is necessary to be lightweight, and clutch housings and large transmission cases cannot be used because they increase weight.

(c) Problems that the invention aims to solve
The PTO shaft drive device is configured to transmit power simply and without waste.

That is, the PTO shaft does not pass through the transmission case, but is configured to transmit power directly from the engine via the belt, thereby reducing weight.

Also, when a rotary mower is installed on the front wheels of the aircraft, it is necessary to pay attention to the height adjustment of the rotary mower and the connection and disconnection of rotation, so the driver's seat should be as low as possible and the rotary mower placed in front. The engine 1 is placed at the rear and the driver's seat is placed at the front.

This allows for simple power transmission from the rear engine to the front PTO shaft and rear PTO shaft.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

An engine 1 is arranged at the rear of the aircraft, and a driven shaft 6 is arranged below the engine 1 in the front and back.
Power is transmitted to the driven shaft 6 using a V-belt, and the driven shaft 6 protrudes to the rear end of the machine and also serves as the rear PTO shaft. The front axle cases 14 are protruded toward the left and right front wheels 4, and a bearing device 16 is disposed on the longer front axle case 14 to pivotally support the front PTO shaft 7.
The rear end of the front PTO shaft 7 and the driven shaft 6 are connected by joints 9a and 9b.

(e) Embodiment The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is an overall side view of the small special tractor of the present invention, and FIG. 2 is a front view of the same.

A chassis frame 2 is placed on front axle cases 14 of front wheels 4, and a center pin pivot plate 24 for pivotally supporting a rear axle protrudes from the rear of the chassis frame.

Although the front axle cases 14 protrude from the sides of the transmission case 3 on both sides, the transmission case 3 itself is not located at the center of the machine body but is placed at an eccentric position.

A bearing device 16 for the front PTO shaft 7 is arranged on the longer front axle case 14. A gear shift lever 26 protrudes from the transmission case 3 to the side of the operator inside the driver's cab 22.

A work equipment mounting device 25 for mounting a rotary mower, rotary tilling device, etc. is provided protruding from the front of the machine.

The driver's cab 22 is provided at the front of the fuselage, and the rear thereof is an engine room 23, in which the engine 1 is placed.

The engine 1 is fixed on an engine frame 17, and a cushioning material 12.1 made of an elastic material is provided between the engine frame 17 and the chassis frame 2.
2, 12, 12 are interposed. 5.5 is a rear wheel, which is configured to be steerable by a steering wheel.

Pulleys 10 and 20 are mounted on the front protrusion of the engine crankshaft 27, and pulley 1
A V-belt is wound around the pulley 13 of the driven shaft 6 from 0. A belt tension clutch device consisting of a belt tension pulley 11 is provided on the V-belt. Power is transmitted to the transmission case 3 through another pulley 20.

The driven shaft 6 is disposed between the chassis frame 2 below the engine 1, and is a part of the engine frame V.
Double bearing 15 provided in the shape part 17a
It is supported by bearings 15 a and 15b.

The pulley 21 allows power to be taken out from the rear, and the driven shaft 6 also serves as the rear PTO shaft.

Since the engine 1 swings up and down on the cushioning materials 12, 12, 12, 12, the driven shaft 6 also swings accordingly. Therefore, the joints 9a and 9b and the intermediate shaft 8 are configured to be able to swing, and the front PTO
It is connected to the shaft 7.

3 is a perspective view showing the transmission case 3 and the bearing device 16, FIG. 4 is a perspective view of the vicinity of the engine 1, FIG. 5 is a front view of the engine 1, and FIG. 6 is a perspective view of the engine frame 17. Figure 7 shows bearing device 1
6 is a perspective view, FIG. 8 is a rear view, and FIG. 9 is a side sectional view.

Power is transmitted from the engine 1 to the transmission case 3 through an input shaft portion 18. The bearing device 16 is mounted on the longer front axle case 14 among the front axle cases 14. Front axle 14a, 14 from front axle case 14
A stands out.

The left and right sides of the engine frame 17 are connected by a V-shaped part 17a, and a bearing 15 is attached to the bottom of the V-shape.
is composed of double bearings 15a and 15b.

The bearing device 16 of the front PTO shaft 7 is also configured with double bearings 16a and 16b.
The front PTO shaft 7 is supported by several bearings. The front PTO shaft 7 and the driven shaft 6 are connected by joints 9a and 9b and an intermediate shaft 8 so as to be vertically swingable.

A PTO pulley 29 is fixedly installed within the chassis frame 2 at the tip of the front PTO shaft 7. Applicable
Power is transmitted from the PTO pulley to the work machine attached to the work machine mounting device 25.

The driver's seat 22 is configured in the shape of a hat and can be opened and closed by rotating around a pivot 30 at the tip.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, by placing the engine 1 at the rear, the seat can be lowered, and by placing the driven shaft 6 passing under the engine 1, it is possible to lower the seat.
It can be used as a PTO shaft, and while it is a tractor with a stable center of gravity even on slopes, it can be configured to transmit power to both front and rear work equipment.

Second, the transmission case 3 is arranged eccentrically to the left in the direction of travel, and front axle cases 14 of different lengths are provided, and a bearing device for the front PTO shaft 7 is placed on top of the longer front axle case 14. 16, the front PTO shaft 7
This allows the front axle case 14 to serve as the support for the front axle.

Thirdly, since the power of the engine 1 can be directly transmitted to the front PTO shaft 7 through the belt and joints 9a and 9b, there is no need to pass the PTO transmission system through the transmission case as in the past. The mechanism was simplified, and the transmission case could be made smaller and lighter.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the compact special agricultural tractor of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a perspective view showing the transmission case 3 and bearing 16, and Fig. 4 is a perspective view of the vicinity of the engine 1. 5 is a front view of the engine 1, FIG. 6 is a perspective view of the engine frame 17, FIG. 7 is a perspective view of the bearing 16, FIG. 8 is a rear view, and FIG. 9 is a side sectional view. . 1... Engine, 3... Mission case, 4
...Front wheel, 6...Driver shaft, 7...Front PTO
Shaft, 9...Joint, 11...Tension pulley, 14...Front axle case, 16...
...Bearing device, 17...Engine frame.

Claims (1)

[Scope of utility model registration request] An engine 1 is arranged at the rear of the aircraft, and a driven shaft 6 is arranged below the engine 1 in the front and back.
Power is transmitted to the driven shaft 6 using a V-belt, and the driven shaft 6 protrudes to the rear end of the machine and also serves as the rear PTO shaft. The front axle cases 14 are protruded toward the left and right front wheels 4, and a bearing device 16 is disposed on the longer front axle case 14 to pivotally support the front PTO shaft 7.
A transmission device for an agricultural tractor, characterized in that the rear end of the front PTO shaft 7 and the driven shaft 6 are connected by joints 9a and 9b.