JPS629146Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a design regarding the structure of a front PTO device for transmitting power to a working machine attached to the front or abdomen of an agricultural tractor.

The front PTO device transmits power by winding a V-belt between the front PTO pulley and the gearbox input pulley of the working machine, and is not always necessary and can be removed or installed.

For this reason, not only is it required that the front PTO device itself be easy to install and remove, but one of the conditions is that the V-belt can be easily wound around the front PTO pulley when the front PTO device is installed. .

Previously, the front PTO pulley itself protruded in a cantilevered manner from the front of the tractor to make it easier to wind the V-belt, but this required a pulley cover and was dangerous because the drive system protruded from the front end. It was hot.

Furthermore, since the front PTO pulley itself is cantilevered, when pulled with a V-belt, the front PTO
There was also a strength problem with the pulley shaft being bent.

This invention places the front PTO pulley inside the bonnet for safety.
In order to make it easier to hang the V-belt on the pulley, it is supported on a cantilever, but instead of supporting the front PTO pulley itself on a cantilever,
The PTO pulley 18 is supported on both sides, and the bearing case supporting the front PTO pulley is supported on a cantilever to ensure strength.

Conventionally, the front was placed inside the bonnet.
In the case of a PTO pulley, the V-belt could not be installed or removed without removing the bearing device.

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 a side view of a tractor with a belly-mounted working machine such as a rotary mower attached thereto, and FIG. 2 is a plan view of the same.

An engine E is placed inside a bonnet 1, and a front PTO device A of the present invention is provided at the front of the engine E. The engine E and the front PTO device A are fixedly mounted on a body frame 2 that constitutes a body support member of the tractor, as will be described later.
Front axle bracket 2 on aircraft frame 2
cross the front axle bracket 2a
through the center pin 13 to the front axle 1
2, and the front wheels 3,
It supports 3.

Reference numerals 5 and 5 indicate rear wheels, which are covered with left and right integral fenders 6. A seat 7 is provided above the fender 6, and in front of the seat 7, a steering handle 8 and a vertical operation lever 11 of the abdominal-mounted work machine are provided. 9,9 are left and right steps.

A rotary mower 4 is suspended between the front wheels 3, 3 and rear wheels 5, 5 of the tractor, and is driven via a long belt from an output pulley 10b of a bevel gear box 10 fixed to the front end of the machine frame 2. ing. A V-belt is wound between the input pulley of the bevel gear box 10 and the front PTO pulley 18 of the front PTO device to transmit power.

Figure 5 is a side sectional view of front PTO device A.
FIG. 6 is a front view as well.

The front PTO device A of the present invention is integrally supported by a bearing case 17. The bearing case 17 is fixed to the front PTO device mounting frame 2b of the body frame 2, so that it can be easily mounted. Bearing case 1
7 has a U-shaped part in side view that is open at the top, and the front PTO pulley 18 and front PTO are installed in this part.
The clutch device is inserted and supported.

When installing, first attach the universal joint 1 to the front of the radiator fan pulley 15 provided on the crankshaft protrusion of the engine E.
6 is fixed with bolts 15a. Further, in that case, the front PTO device A is kept separate from the universal joint 16. Connect the universal joint 16 to the radiator fan pulley 1
5, the front PTO device A is approached from the front, the spline shaft 28 of the universal joint 16 is fitted into the spline cylinder 29, and the bearing case 17 is fixed to the mounting frame 2b.

This fixation means that the engine E is a vertical water-cooled engine E1.
In this case, as shown in FIG. 3, the position of the crankshaft, ie, the center position O1 of the radiator fan pulley 15, is low, so the front PTO device can be mounted low.

Therefore, in the case of the vertical water-cooled engine E1, the eighth
Mounting holes 17a, 17a, 1 of bearing case 17 in the figure
7b, 17b are fixed to the mounting holes 2e, 2e, 2f, 2f of the mounting frame 2b shown in FIG.

Due to horsepower and cost considerations, when installing a low-horsepower, low-cost horizontal water-cooled engine E2, the center position O2 of the radiator fan pulley 15 will be higher, as shown in FIG. 4, so the bearing case shown in FIG. 17 mounting holes 17a, 17a, 17
b, 17b are fixed to the mounting holes 2d, 2d, 2e, 2e of the mounting frame 2b shown in FIG.

In the case of small tractors like this, the required engine horsepower and satisfactory price vary depending on the type of work equipment installed, so there are cases where the engine is replaced with a vertical water-cooled engine or a horizontal water-cooled engine, but in both cases, Also, front PTO device A
are the same, and the same can be used for the fuselage frame 2 as well.

In FIGS. 3 and 4, 14 is a shock absorber.

FIG. 11 is a sectional view taken along the line C--C in FIG. 12, FIG. 12 is a plan view of the fuselage frame 2, and FIG. 13 is a front view.

2c is a bumper, 2a is a front axle bracket, and 2b is a mounting frame for the front PTO device A. Mounting hole 2 of mounting frame 2b
d, 2e, and 2f are not lined up on a vertical line, but are shifted to the right in the direction of travel as they go downward.

This is because the positions of the crankshafts of the vertical water-cooled engine E1 and the horizontal water-cooled engine E2 are different from each other, and the center positions O1 and O2 of the radiator fan pulley 15 are different from each other.

Consistent with this, the mounting holes 17a and 17b of the bearing case in FIGS. 8 and 9 are also not on the vertical line,
It's shifted.

FIG. 7 is a side sectional view of the bearing case, FIG. 8 is a rear view, FIG. 9 is a front view, and FIG. 10 is a bottom view.

As shown in FIG. 10, the lower rib of the bearing case 17 is made smaller than the diameter of the front PTO pulley and runs away toward the mounting frame, so the V-belt does not touch it.

The internal structure of the front PTO device A will be explained using a sectional view of the front PTO device A shown in FIG.

The power transmitted from the universal joint 16 is transmitted from the spline shaft 28 to the spline cylinder 29. A short shaft 24 is fixed to a spline cylinder 29, and the spline cylinder 29 and short shaft 24 are supported by bearings 33 and 31 in a bearing case 17 via spacers 29a and 24a.

A clutch facing 23 is attached by fitting a key 23a with the outer periphery of the spline cylinder 29 as a boss. Also, clutch facing 23
The bearing cylinder 25 of the bearing 30 is fixed to the inner diameter part of the bearing 30 and projects forward. A boss is also carved at the rear to form a receiving surface for the bearing 32.

A bearing case 18 is placed around the outer circumference of the bearing 30.
A front PTO pulley 18 is fixedly provided via a, and a clutch facing 18b is fixedly provided to the rear surface of the front PTO pulley 18 via an elastic plate 18c. Furthermore, clutch facing 18b
A spring receiving plate 18d is fixed to the outer periphery of the spring.

On the other hand, a solenoid 22 and a spring-inserted bolt 19 are provided on an extension of the bearing receiver 21 on the outer periphery of the bearing 32, and the spring-inserted bolt 19 is connected to the spring receiver plate 18d via a buffer spring 20.

When the solenoid 22 is excited based on the clutch connection signal, the clutch facing 18b comes into contact with the clutch facing 23 against the buffer spring 20 of the elastic plate 18c, and the solenoid 22 and the front
The PTO pulley 18 simultaneously begins to rotate together with the clutch facing 23.

To assemble the front PTO device A, first fix the solenoid to the bearing receiver 21, install the bearing 32, and then attach the clutch facing 2.
Insert 3.

Separately, temporarily attach the front PTO pulley assembly to the bearing receiver 21 with spring interposed bolts 19, etc., and then attach the bearing 30 to the bearing receiver 25.
Insert it around the outer circumference and secure it in place.

Insert the assembly in this state from the upper opening of the bearing case 17, and insert the assembly into the rear hole 1 of the bearing case 17.
From 7e, insert the integrated short shaft 24 and spline tube 29 while inserting the key 23a.

Next, the spacer 29a is inserted into the spline cylinder 29 so as to contact the inner ring of the bearing 32, and then the bearing 33 is inserted between the rear hole 17e of the bearing case 17 and fixed with a C-shaped retaining ring.

Next, from the bearing case 17 and the front hole 17f to the spacer 2
4a, fit it against the inner ring of the bearing 30, insert the bearing 31, and fix it with a C-shaped retaining ring. Finally, the short shaft 24 and the spline cylinder 29 are tightened with the backing plate 27 and bolts 26 to prevent them from coming off.

The front PTO device is integrally assembled into the bearing case 17 in the above order.

As described above, the present invention is based on the front PTO pulley 18 disposed inside the bonnet 1 of an agricultural tractor.
The front and rear ends are supported by bearings in a bearing case 17 which has a U-shaped upper opening when viewed from the side, and a mounting frame 2b is placed in front of a front axle bracket 2a that is suspended horizontally on the left and right fuselage frames 2. Since the rear surface of the bearing case 17 is fixed to the front surface of the mounting frame 2b and supported in a cantilever manner, the following effects are achieved.

First, the front PTO pulley 18 is located inside the bonnet 1, so it is safe as long as you do not put your hand in from below the bonnet 1.
Even without installing a PTO pulley cover, it is possible to prevent accidents resulting in injury or death.

Second, since the front PTO pulley 18 is placed inside the bonnet 1, it is troublesome to wrap the V-belt around it, and if the front PTO pulley 18 is supported at both ends, it is especially difficult to remove the bearing part. Otherwise, the V-belt cannot be hung, but in the case of the present invention, it is the bearing case 17 that holds the front PTO pulley 18 on both sides, and the bearing case 17 has a U-belt that is open at the top when viewed from the side. Since it is shaped like a letter and supported on a cantilever, it was easy to hang a V-belt on it.

Thirdly, although the bearing case 17 is supported on a cantilever, it can be firmly supported on the mounting frame 2b and has sufficient strength, and the front PTO pulley 18 itself is supported on both front and rear sides. This prevents the pulley shaft from being pulled and bent by the V-belt.

This prevents the shaft of the front PTO pulley 18 from being pulled and deformed by the V-belt, compared to the conventional front PTO device in which the front PTO pulley is cantilevered from the bearing part and protrudes. It is something that can be done.

[Brief explanation of the drawing]

Figure 1 is an overall side view of a small agricultural tractor with a rotary mower attached to its abdomen, Figure 2 is a plan view of the same, Figure 3 is a front side view when the vertical water-cooled engine E1 is installed as the engine, Figure 4 is a front sectional view when a horizontal water-cooled engine is installed as the installed engine, FIG. 5 is a side sectional view of front PTO device A, FIG. 6 is also a front view, and FIG.
The figure is a side cross-sectional view of the bearing case 17, FIG. 8 is a rear view of the bearing case 17, FIG. 9 is a front view, FIG. 10 is a bottom view, and FIG. 11 is a mounting frame section suspended over the fuselage frame. C- in Figure 12 showing
12 is a plan view of the fuselage frame, and FIG. 13 is a front view of the fuselage frame. A...Front PTO device, E...Engine,
1... Bonnet, 2... Airframe frame, 2b...
...Mounting frame, 17...Bearing case, 18...
Front PTO pulley.

Claims (1)

[Scope of utility model registration request] A front PTO pulley 18 placed inside the bonnet 1 of an agricultural tractor is supported at its front and rear ends by a bearing case 17 that has a U-shaped upper opening when viewed from the side, and the front axle bracket is suspended horizontally on the left and right body frames 2. A front PTO device for an agricultural tractor, characterized in that a mounting frame 2b is disposed at the front of the mounting frame 2a, and the rear surface of the bearing case 17 is fixed to the front surface of the mounting frame 2b so as to be supported in a cantilever manner.