JPS63159132A - Mounting mechanism of midmount working machine - Google Patents

Abstract

PURPOSE:To increase the lifting/lowering stroke of a gear box, by arranging a flywheel of an engine at an front section and transmitting power to the rear section then performing U-turn thereafter transmitting power to a rotary mower device arranged between an engine and a transmission case. CONSTITUTION:A rotary mower device R is arranged liftably/lowerably through back/forth rotation of a steering wheel 40 between front and rear wheels 24, 25. Power for said rotary mower device R is transmitted through a front PTO shaft 7 projecting farther than a transmission case M and a joint shaft 6 into a gear box G. A flywheel 3 is arranged in front of an engine E. Consequently. space is ensured above the gear box G and the lifting/lowering stroke can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a power transmission mechanism for a mower tractor in which a rotary mower device is installed in the abdomen of a machine body.

(b) Prior Art A mower tractor device in which a rotary mower device is attached to the abdomen of a machine body has been known for some time.

For example, it is disclosed in Japanese Utility Model Application Publication No. 56-111603.

(c) Problems that the invention aims to solve However, in most conventional technologies, the power was extracted from the front of the engine, and then the power from the U-turn was transmitted to the rotary mower device attached to the belly of the aircraft. be.

Therefore, the universal joint shaft passes under the front axle and under the engine, which interfere with each other, making it impossible to increase the vertical stroke of the rotary mower device.

In order to solve these problems, the present invention places the engine flywheel at the front, freeing up space for the flywheel that was conventionally placed at the rear, and transmits power once to the rear. By later making a U-turn and transmitting the signal forward, the interference member between the front PTO shaft and the gearbox G of the rotary mower device is eliminated, and the gearbox is configured to be able to move up and down over a large distance.

(d) Means for Solving the Problems The objects of the present invention are as described above. Next, the configuration for achieving the objects will be explained.

In an engine placed in the hood of a tractor, the flywheel of the engine is placed in the front, and the power is transmitted from the crankshaft protruding rearward to the H3T type transmission placed at the rear of the machine, passing through the H3T type transmission. The rotary mower transmits the subsequent power to the forward-facing front PTO shaft via the mission case, and is suspended from the front PTO shaft via a joint shaft so as to be able to rise and fall below the fuselage between the engine and the mission case. It is configured to transmit power to the device.

(E) Embodiments and Functions The purpose and structure of the present invention are as described above. Next, the structure and functions of the embodiments shown in the attached drawings will be explained.

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

An engine E is arranged inside the bonnet I-B. The engine E has a flywheel placed at the rear of conventional tractor engines, which is covered by a clutch housing, whereas in the present invention, a flywheel 3 is placed at the front of the engine E, and the flywheel The wheel 3 is covered by the bonnet B.

A radiator 23 is arranged at the front of the engine E, an air cleaner 29 is arranged above the front, and a muffler 22 is arranged above.
are placed. A muffler exhaust pipe 21 protruding from the muffler 22 is opened from below the space between the flywheel 3 and the radiator 23 between the fuselage frenim IL and IR.

Although there is no flywheel 3 on the rear surface of the engine E, a thin cooling water pump, lubricating oil pump, etc. are arranged. Crankshaft I protruding from the part
Power is transmitted through the joint shaft 9 to the input shaft 11 of the H3T transmission H.

A fuel tank 14 is arranged at the bottom of the dash board D at the rear of the bonnet B.

Furthermore, the lower end of the handle shaft 17 of the steering handle 2 was conventionally provided with a steering gear box, but in the present invention, the lower end of the steering gear device at the lower front part of the engine E is connected to the lower end of the steering gear box via the joint shafts 27 and 26. It transmits rotational force to the parts.

The input shaft 11 of the HS T-type transmission H also serves as a hydraulic pump shaft, and the hydraulic motor is driven by the pressure oil discharged from the hydraulic pump of the H3T-type transmission [I, which is transmitted to the transmission case M. That's what I'm doing. The driving power is transmitted from inside the mission case M to the inside of the traveling power transmission case A, and after being decelerated, drives the axle of the rear wheels 25 via the differential gear device.

In addition, the rear end of the shaft of the human power shaft 11' is projected as it is, and the input shaft 11 passes through the mission case M, passes through the PTO electromagnetic clutch 8, and then is transmitted again into the mission case M, and further internally. After passing through the front and rear PTO clutches, power is transmitted to the rear PTO shaft 5 and front PTO shaft 7 by branching.

A battery storage stand 19 is installed on the left and right sides of the rear ends of the body frames IL and IRO, and the battery 4 is mounted and fixed on the battery storage stand 19.

Furthermore, a work equipment mounting frame 18 is erected at the rear end of the input shaft 11.

The rotary mower device R, which constitutes the main part of the present invention, is disposed between the front wheels 24 and the rear wheels 25 so that it can be raised and lowered by rotating the manual lifting handle 40 back and forth.

The power to the rotary mower device R is transmitted to the inside of the gear box G by interposing a joint shaft 6 to a front PTo shaft 7 that protrudes forward from the mission case M.

In the conventional mounting method of rotary mower equipment: When using joint shaft and gearbox, gearbox G
protrudes above the mower, so that the gearbox
Conventionally, this part contacted the flywheel, which was placed above, and regulated the vertical 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 gearbox G can be fitted into the position between the left and right fuselage frames IL and IF5, and in particular, by fitting into the position between the joint shaft 6 and the fuselage frame LL, it is possible to move upward. This ensures the stroke.

13 is a cooling fan fixedly installed on the input shaft 11.

The gearbox G is covered on the left and right by the body frames IL and IR, and the outside thereof is covered by fenders and steps, and is also covered by a fan cover 41, and is cooled by the air discharged from the cooling fan 13.

This eliminates heat generation and ensures safety against personal injury.

4 is a side sectional view of the arrangement portion of the fuel tank 14, FIG. 5 is a front view, 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.

The fuel tank 14 is placed on a tank mounting base 16 that projects upward from the fuselage frames IL and IR, and is fixed at the front by air cut plates 1 and 42, and at the bottom by the tank mounting base 16. The rear and left and right sides are held by the side plates 43 of the dash board D, and the protrusion 14a of the fuel tank 14 is fitted into the recess 15a provided in the air cut plate 15 of the dash board D, thereby eliminating the left and right shaking of the fuel tank 14. -ing

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 configuration, the seat pan 20 is constructed inside the seat S by a method such as vacuum molding of synthetic resin, and is configured as an auxiliary tank for the fuel tank 14 or a hydraulic oil tank for a hydraulic system.

A heat insulating sheet 44 is interposed on the sheet pan 20,
The cushion of the seat S is placed on top of this.

The embodiment shown in FIG. 10 shows an embodiment in which the number of ribs 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 thereof.

The steering gear device is disposed at the rear of the front axle as shown in FIG. Further, a small diameter gear 30 meshes with a sector gear 32 via a reversing gear 31. A tie rod arm 33 is fixedly mounted to the sector gear 32. The tie rods 34 and 34 are connected.

With this configuration, when the steering handle 2 is rotated left and right, the gears 30 and 31 are rotated through the joint shafts 27 and 26.
The fan-shaped gear 32 rotates and the tie rod 34 is operated.

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

First, in the conventional technology, the flywheel of engine E was configured at the rear, and the clutch housing was arranged to cover the flywheel.
When the gearbox of the mower device rose, it interfered with the clutch housing, so there was a problem that the mower device could not take a large lifting stroke, but as in the present invention, the flywheel 3 is connected to the engine. By placing it in front of E, we were able to eliminate this problem.

Second, since the front PTO shaft 7 and the joint shaft 6 are arranged rearward and configured to transmit power to the gearbox G, the joint shaft 6 itself does not come into contact with the lower surface of the engine E. From this point of view, the vertical stroke of the mower device can be reduced.

Thirdly, by placing the flywheel 3 in front of the engine E, there is no need to place a clutch housing in this area, so the step can be configured wider than before, increasing the operator's living space. I was able to do that.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of the mower tractor of the present invention, and FIG.
3 is a sectional view of the muffler exhaust pipe 21 in front of the bonnet B, and FIG. 4 is a plan view of the fuel tank 14.
5 is a front view, FIG. 6 is a side view showing the left and right fixing parts of the fuel tank 14, FIG. 7 is a rear sectional view, and FIG. 8 is a front view of the seat S. , FIG. 9 is a side sectional view of the seat S, FIG. 10 is the same (side sectional view of another embodiment), and FIG. 11 is a side view of the steering gear device.
FIG. 12 is also a front view. A... Traveling power transmission case B... Bonnet D... Dashboard H... HST type transmission G... Gearbox R... Rotary mower device 6... Joint shaft 7... Front PTO Axis Applicant Yanmar Diesel Co., Ltd. Agent Patent Attorney Toshikazu Yano Figure 3B Figure 12

Claims (1)

[Claims] In an engine placed in the hood of a tractor, the flywheel of the engine is placed at the front, and the power is transmitted from the rearwardly protruding crankshaft to the HST type transmission located at the rear of the machine, and after passing through the HST type transmission. A rotary mower device that transmits power to a forward-facing front PTO shaft via a mission case, and is suspended from the front PTO shaft via a joint shaft so as to be able to rise and fall below the fuselage between the engine and the mission case. A mounting mechanism for a mid-mount work machine, characterized in that it is configured to transmit power to.