JPS6210181Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support structure for a front PTO device that transmits power to a working machine attached to the front or abdomen of a tractor.

The working machines attached to the front or abdomen of the tractor are reciprocating mowers, rotary mowers, etc., and are not used on all tractors. Therefore, the front PTO device must be installed only when necessary, and must be an attachment that can be easily installed and removed.

The present invention facilitates the installation and removal of the front PTO device, even though the front PTO device is located inside the bonnet of the tractor. The V-belt can be easily hung on the front PTO pulley from the underside of the tractor body frame, and the front PTO pulley 18 and universal joint can be easily removed.

Furthermore, even if the engine mounted on the tractor is changed from a vertical water-cooled engine to a horizontal water-cooled engine, the front PTO pulley can be used by simply changing the mounting position of the front PTO 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 small tractor with a rotary mower attached, and FIG. 2 is a plan view of the same.

The engine E is placed inside the bonnet 1, and the left and right fuselage frames 2 are fixed to the sides of the engine E.
is protruded forward as a tractor body support member.

A front axle bracket 2a is suspended over the body frame 2, a front axle 12 is pivotally supported on the front axle bracket 2a via a center pin 13, and front wheels 3, 3 are supported on the front axle 12. 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 by an output pulley 10b of a bevel gear box 10 fixed to the front end of the machine frame 2 via a long belt. are doing. 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.

FIG. 5 is a side sectional view of the front device A, and FIG. 6 is a front view thereof.

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.

The bearing case 17 has a U-shaped portion in side view with an open top, into which a front PTO pulley 18 and a front PTO clutch device are 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. After fixing the universal joint 16 to the radiator fan pulley, the front PTO device A is approached from the front, the spline shaft 8 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, that is, the center position O1 of the radiator fan pulley 15, is low, so the front PTO device can be mounted low, and the mounting holes 17a, 17a, 17b, 17b into the mounting holes 2e, 2e, 2f, 2 of the mounting frame 2b in FIG.
Fixed at f.

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 Figure 4, so the bearing case shown in Figure 8 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.

Figure 11 shows the mounting frame 2b on the aircraft frame 2.
12 is a cross-sectional view taken along the line C-C in FIG. 12 showing the state in which the
The figure is also a front view.

2c is a bumper, 2a is a front axle bracket, and 2b is a mounting frame for the front PTO device.

The mounting holes 2d, 2e, and 2f of the mounting frame 2b are not lined up on a vertical line, but are shifted toward the right in the traveling direction as they go downward.

This is the position of the crankshaft of the vertical water-cooled engine E1 and the horizontal water-cooled engine E2, that is, the center position O1 of the radiator fan pulley 15.
This is because the O2 and O2 are different.

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.

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. Further, a bearing sleeve 25 of the bearing 30 is fixed to the inner diameter portion of the clutch facing 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 is energized based on the clutch connection signal, the clutch facing 18b
8c It contacts the clutch facing 23 against the buffer spring 20, 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.

Next, temporarily attach the front PTO pulley assembly to the bearing receiver 21 with the spring interposed bolt 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,
The shaft 24 is shorter than the hole 17e at the rear of the bearing case.
The integrated spline tube 29 is the key 23.
Insert while adding a. Next, the spline tube 29
Insert the spacer 29a against the inner ring of the bearing 32, and then insert the spacer 29a into the rear hole 17 of the bearing case 17.
Insert the bearing 33 between the C-shaped retaining ring and the C-shaped retaining ring. Next, insert the bearing case 17 and the spacer 24a through the front hole 17f, and then insert the bearing 30
Insert the bearing 31 against the inner ring of the housing, insert the bearing 31, and fix it with a C-shaped retaining ring. Finally, fix the short shaft 24 and spline tube 29 to prevent them from coming off with the plate 27 and the bolt 2.
Tighten at step 6.

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

As described above, the present invention pivots the front PTO device A, which consists of the front PTO pulley 18 and the front PTO clutch device, on the bearing case 17, which has a U-shaped upper opening when viewed from the side, with the front and rear ends supported at both ends. , the bearing case 17 is attached from the front to the mounting frame 2b of the front PTO device A, which is installed horizontally and vertically on the left and right body frames 2 within the bonnet 1 of the agricultural tractor, and the rear surface of the bearing case 17 and the engine E are attached. Since a universal joint is interposed and supported between the radiator fan pulley 15, the following effects are achieved.

First, leave the bonnet and radiator as they are, and install the front PTO from the bottom of the aircraft frame.
The device is inserted into the rear part of the bumper of the fuselage frame, and from there, the spline tube is fitted onto the spline shaft of the universal joint and pushed in, and then fixed to the vertical mounting frame. can be easily done in the same position.

Second, universal joint and front
The PTO device is spline-fitted and can be easily separated, so first the universal joint is fixed to the radiator fan drive pulley, and then the front PTO device is fitted into the spline shaft as a whole, making it easy to install even in difficult locations. It will be done.

Thirdly, by supporting the front and rear ends of the front PTO pulley 18 and the PTO clutch device on both sides by the bearing case 17, even when bending force is applied to the front PTO pulley 18 from the V-belt,
The pulley shaft does not bend, and the bearing case 17 is U-shaped in side view with an upward opening.
Since it was installed on the mounting frame 2b in a cantilevered state,
There is no need to remove the front PTO pulley 18 or bearing case 17 when attaching the V-belt.

Fourth, by arranging multiple sets of mounting holes for the bearing case 17 on the mounting frame, when changing the engine E,
Since the mounting position of the bearing case 17 can be changed, it can be used universally when the engine E mounted on the tractor is a vertical water-cooled engine or a horizontal water-cooled engine, or when the engine is changed to one with a different horsepower. Differences in height that cannot be absorbed by the joint can be absorbed by changing the mounting position of the bearing case 17. This allows the same front PTO device A to be used even when various engines are installed, which is also advantageous when it is installed later as an attachment.

[Brief explanation of drawings]

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 sectional view when the vertical water-cooled engine E1 is installed as the engine, and 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,
2...Airframe frame, 2b...Mounting frame, 6
...Universal joint, 17...Bearing case, 18...Front PTO pulley, 18b,
23...Clutch facing.

Claims (1)

[Scope of claims for utility model registration] (1) Front PTO pulley 18 and front
A front PTO device A consisting of a PTO clutch device is pivotally supported at both front and rear ends on a bearing case 17 having a U-shaped upper opening when viewed from the side,
A front panel installed vertically within the bonnet 1 of an agricultural tractor and horizontally mounted on the left and right body frames 2.
Agricultural use characterized in that a bearing case 17 is attached to the mounting frame 2b of the PTO device A from the front, and a universal joint is interposed and supported between the rear surface of the bearing case 17 and the radiator fan pulley 15 of the engine E. Tractor front PTO device. (2) A plurality of sets of mounting holes for the bearing case 17 are arranged in the mounting frame described in claim (1) of the utility model registration, and when changing the engine E, the bearing case 1
A front PTO device for an agricultural tractor, characterized in that the mounting position of item 7 can be changed.