JPH0647339B2 - Mounting mechanism of the Mitumount work machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a power transmission mechanism of a mower tractor attached to the abdomen of the body of a rotary mower device.

(B) Prior Art Conventionally, a mower tractor device in which a rotary mower device is mounted on the abdomen of a body has been known.

For example, Japanese Utility Model Laid-Open No. 61-153,631 and Japanese Patent Laid-Open No. 59-63.
This is as disclosed in JP-A-113816, JP-A-61-149514 and JP-A-56-111603.

(C) Problems to be Solved by the Invention However, in most of the conventional techniques, the power is taken from the front of the engine and then the U-turned power is transmitted to the rotary mower device mounted on the body abdomen. is there.

Therefore, since the universal joint shaft passes under the front axle and under the engine, and these interfere,
The vertical stroke of the rotary mower could not be increased.

In order to solve these problems, the present invention arranges the flywheel of the engine in the front part to open the space of the flywheel part which is conventionally arranged in the rear part, and after transmitting the power to the rear once. By making a U-turn and transmitting to the front, an interference member between the front PTO shaft and the gear bonnet G of the rotary mower device is eliminated, and the gear box can be moved up and down greatly.

(D) Means for Solving the Problems The object of the present invention is as described above, and a configuration for achieving the object will be described below.

The flywheel of the engine placed in the hood of the tractor is placed in the front, and the main joint shaft transmits power to the HST type transmission arranged rearward of the fuselage from the crankshaft protruding rearward, and passes through the HST type transmission. The rear power is transmitted to the front P through the mission case.
In a configuration in which power is transmitted to the TO shaft, and power is transmitted from the front PTO shaft via a joint shaft to a rotary mower device suspended vertically below the body between the engine and the transmission case, in a configuration above the rotary mower device. ,
A gear box for inputting power from the joint shaft is projected, and the gear box can be fitted between the vehicle body frames of the tractor passing through the left and right of the engine at a position where the gear box does not interfere with the main joint shaft. .

(E) Embodiments and Functions The object and structure of the present invention are as described above. Next, the structures and operations of the embodiments shown in the accompanying drawings will be described.

1 is an overall side view of a mower tractor of the present invention, FIG.
The figure is also a plan view, and FIG. 3 is a sectional view of a portion of the muffler exhaust pipe 21 at the front part of the bonnet B.

An engine E is arranged in the hood B. In the engine E, a flywheel 3 is arranged in the front part of the engine E in the present invention, whereas the flywheel of the conventional tractor is mostly arranged in the rear part and covered with a clutch housing. The wheel 3 is covered by the hood B.

A radiator 23 is arranged at the front of the engine E, an air cleaner 29 is arranged at the front upper side, and a muffler 2 is arranged at the upper side.
2 are arranged. The muffler exhaust pipe 21 projecting from the muffler 22 is discharged from below the space between the flywheel 3 and the radiator 23 between the body frames 1L and 1R.

Although the flywheel 3 is not provided on the rear surface of the engine E, thinly formed cooling water pumps, lubricating oil pumps and the like are arranged. The crankshaft 10 protruding from this portion is connected to the HST transmission H through the main joint shaft 9.
The power is transmitted to the input shaft 11 of.

A fuel tank 14 is arranged below the dashboard D at the rear of the hood B.

Further, a steering gear box is conventionally arranged at the lower end of the handle shaft 17 of the steering handle 2, but in the present invention, the joint shafts 27, 26 are provided.
The rotational force is transmitted to the portion of the steering gear device in the lower front part of the engine E via the.

The input shaft 11 of the HST transmission H also serves as a hydraulic pump shaft, and a hydraulic motor is driven by the pressure oil discharged from the hydraulic pump of the HST transmission H and transmitted to the inside of the mission case M. Is there.

It is transmitted from the inside of the transmission case M to the inside of the traveling power transmission case A, is decelerated, and then drives the axle of the rear wheel 25 through the differential gear device.

Moreover, the rear end of the shaft of the input shaft 11 is projected as it is,
The input shaft 11 passes through the transmission case M once, passes through the PTO electromagnetic clutch 8 and is then transmitted to the transmission case M again, and further passes through the front and rear TPO clutches inside, and then the rear PTO shaft 5 and the front PTO shaft 7. Power is transmitted by branching to.

At the rear ends of the machine body frames 1L and 1R, a battery mounting table 19 is disposed so as to extend from side to side, and the battery 4 is mounted and fixed on the battery mounting table 19.

Further, a work implement mounting frame 18 is provided upright on the rear end of the input shaft 11.

The rotary mower device R, which constitutes an essential part of the present invention, is arranged at a position between the front wheel 24 and the rear wheel 25 so that it can be raised and lowered by the forward and backward rotation of the raising and lowering manual handle 40.

The power of the rotary mower device R is transmitted to the inside of the gearbox G by interposing the joint shaft 6 on the front PTO shaft 7 projecting forward from the mission case M.

In the conventional mounting method of the rotary mower device, when the joint shaft and the gear box are used, the gear box G
As it projects above the mower device,
Conventionally, the flywheel, which was conventionally arranged above, was contacted, and this part regulated the lifting stroke.

In the case of the present invention, by arranging the flywheel 3 in front of the engine E, a space above the gearbox G is secured.

As shown in FIG. 2, the gear box G can be fitted in a position between the left and right body frames 1L and 1R, and in particular, by being fitted in a position between the joint shaft 6 and the body frame 1L, the gear box G moves upward. It assures the lifting stroke.

A cooling fan 13 is fixed on the input shaft 11.

The left and right sides of the gearbox G are covered by the body frames 1L and 1R, the outer sides of the gearbox G are covered by the fenders and steps, and are also covered by the fan cover 41 and are cooled by the air discharged from the cooling fan 13. This eliminates fever and secures safety against personal injury.

FIG. 4 is a side sectional view of the arrangement portion of the fuel tank 14, FIG. 5 is a front view thereof, FIG. 6 is a side view showing the left and right fixing portions of the fuel tank 14, and FIG. 7 is a rear sectional view thereof.

The fuel tank 14 is arranged on a tank mounting table 16 projecting upward from the body frames 1L and 1R, and the front is fixed by the air cut plate 42, and the lower part is fixed by the tank mounting table 16 and the rear side. The left and right sides are held by the side plates 43 of the dashboard D, and the fuel tank 1 is provided in the recess 15a provided in the air cut plate 15 of the dashboard D.
The protrusion 14a of No. 4 is fitted to eliminate the swaying of the fuel tank 14 from side to side.

FIG. 8 is a front view of the seat S, FIG. 9 is a side sectional view of the seat S, and FIG. 10 is a side sectional view of another embodiment.

In this structure, the seat pan 20 is formed inside the seat S by a method such as vacuum forming of synthetic resin to form an auxiliary tank of the fuel tank 14 or a hydraulic oil tank of a hydraulic system.

By interposing a heat insulating sheet 44 on the seat pan 20,
The cushion of the seat S is arranged on it.

The embodiment shown in FIG. 10 shows an embodiment in which the rib inside the seat pan 20 is reduced to increase the capacity.

FIG. 11 is a side view of the steering gear device, and FIG. 12 is a front view of the same.

As shown in FIG. 1, the steering gear device is arranged at the rear portion of the front axle. It is set up. Further, the small-diameter gear 30 meshes with the fan-shaped gear 32 via the reverse rotation gear 31. A tie rod arm 33 is fixed to the fan-shaped gear 32, and left and right tie rods 34, 34 are connected to the tie rod arm 33.

With this configuration, when the steering handle 2 is rotated to the left or right, the gears 30, 31 are moved through the joint shafts 27, 26.
The fan gear 32 rotates to operate the tie rod 34.

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

First, by arranging the flywheel 3 of the engine E in the front, a wide space behind the engine E can be configured, so that the gearbox G protruding upward from the rotary mower device R is He was able to climb at a position just behind E.

Second, the gearbox G is attached to the tractor body frame 1
Since it can be fitted between L and 1R, it is possible to increase the lift stroke of the rotary mower device R,
Since the distance between the lower surface of the rotary mower device R and the ground can be increased while the rotary mower device R is housed, the minimum ground clearance of the tractor can be reduced.

Thirdly, the left and right gearbox G, which is in the retracted state, is protected by the body frames 1L and 1R, so that the gearbox G does not come into contact with an obstacle or the like to be destroyed.

[Brief description of drawings]

1 is an overall side view of a mower tractor of the present invention, FIG.
The same drawing is a plan view, FIG. 3 is a cross-sectional view of the muffler exhaust pipe 21 at the front of the hood B, and FIG. 4 is the fuel tank 14.
5 is a front view of the seat S, FIG. 5 is a front view of the seat S, FIG. 5 is a side view showing the left and right fixing parts of the fuel tank 14, FIG. 7 is a rear cross section of the same, and FIG. 9 is a side sectional view of the seat S, FIG. 10 is a side sectional view of another embodiment, and FIG. 11 is a side view of the steering gear device.
FIG. 12 is a front view of the same. A: Travel power transmission case B: Bonnet D: Dashboard H: HST type transmission G: Gearbox R: Rotary mower device 6 ... Joint shaft 7 ... Front PTO shaft 9 ... Main joint axis

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-113816 (JP, A) JP-A-61-149514 (JP, A) Actually-opened JP-A-61-153631 (JP, U)

Claims (1)

[Claims] 1. A flywheel of an engine arranged in a hood of a tractor is arranged in the front, and power is transmitted by a main joint shaft to an HST type transmission arranged rearward of a fuselage from a crankshaft protruding rearward. The power after passing through the transmission is transmitted to the front PTO shaft which faces forward through the mission case, and can be moved up and down below the body between the engine and the mission case through the joint shaft from the front PTO shaft. In a structure for transmitting power to a suspended rotary mower device, a gearbox for inputting power from a joint shaft is projected above the rotary mower device, and the gearbox passes through the left and right sides of an engine when the gearbox rises. Between the main joint shaft and the main joint shaft. Mounting mechanism of Domaunto working machine.