JPS6249505B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power take-off device when a working machine is attached to the front or abdomen of an agricultural tractor.

Traditionally, the front for front-mounted work machines
PTO devices and mid PTO pulleys for abdominal-mounted work machines were provided.

However, in the past, the front PTO was placed in a free position depending on the use of each tractor.
It was equipped with a shaft and a mid PTO pulley. Therefore, neither the front PTO shaft nor the mid PTO pulley were installed.

In the present invention, a front PTO gearbox is fixed below the front axle bracket, power is input to this front gearbox from a crankshaft extension shaft via a V-belt, and from the front PTO gearbox forward,
The PTO shaft protrudes, and the shaft for the mid PTO pulley protrudes downward, allowing power to be taken out in two directions at all times.

The purpose of the present invention is as described above, and the detailed configuration of the present invention will be explained based on the configuration of the embodiment shown in the attached drawings.

Fig. 1 is a front view of the front PTO device of the present invention, Fig. 2 is an enlarged side sectional view, Fig. 3 is a side sectional view when only the mid PTO pulley is used, excluding the front PTO shaft, and Fig. 4. is mitsudo
It is a side sectional view when the PTO pulley is removed and only the front PTO shaft is left.

A fan drive pulley 8 for driving a radiator fan is provided at a portion where the crankshaft of the engine extends and projects forward. A universal joint 9 is interposed at the front end of this fan drive pulley 8, and a crankshaft extension shaft 13
Power is transmitted to. 10 is a bearing device for the crankshaft extension shaft 13.

This bearing device is attached to the front axle bracket 6.
It is placed on a bearing mounting base 21 installed between L and 6R.

An output pulley 15 is fixed to this crankshaft extension shaft 13, and the front
A V-belt 27 is wound around the input pulley 17 of the PTO gearbox to transmit power. As shown in FIG. 1, the front PTO gearbox 12 is fixed to the front axle brackets 6L, 6R by left and right brackets 28L, 28R. A tension pulley pivot plate ( ) is pivotally supported on the bracket protrusion of the front PTO gearbox 12 . Tension pulley 1
6 tensions and relaxes the V-belt 27 to connect and disconnect power.

In order to prevent the problem that when the V-belt 28 is relaxed, the V-belt hangs upward and a complete non-power transmission gap is not created between the output pulley 15 and the V-belt 27, there is a
An arc-shaped belt lifting plate 18 is provided.

Due to the structure of the tractor, the crankshaft of engine 7 is located in the center of the left and right sides of the machine, and
Since it is specified that the PTO shaft 11 is also provided at the center of the left and right sides, both axes are arranged in a straight line on the center line of the aircraft as shown in FIG. Input pulley 1
It would be fine if the axis of axis 31 of 7 was above this, but when the V-belt 27 is pushed by the tension pulley, the front PTO axis 1 inside the V-belt 27
7, the center of the shaft 31 is shifted.

A lever 2 for operating a belt tension type clutch is provided on the side of a dash board 14 at the rear of the bonnet of the tractor, and pulls a tension arm 22 using an inner wire 4 and an outer wire 5 to connect or disconnect power. Do this.
23 and 24 are adjustable so that the V-belt 27 that wraps around the output pulley 15 will not hang down when the clutch is disengaged, and the V-belt will not separate from the output pulley 15, resulting in incomplete power discontinuation. This is the support arm for the belt stopper.

Further, 19 is a cover that covers the mid PTO pulley 29, and is fixed by the four belt holders of the mid PTO pulley 26.

In the cross-sectional view of FIG. 2, when power is transmitted to the input pulley 17, the fixed gear 32 and the bevel gear 33 are driven via the shaft 31, and the bevel gear 3
5. The mid PTO pulley 29 is driven by the shaft 34.

Further, the fixed gear 36 on the front PTO shaft 11 is driven by the fixed gear 32, and the fixed gear 36 on the front PTO shaft 11 is driven by the fixed gear 32.
1 rotates.

In the case of Figure 2, the work equipment is attached to both the front and the abdomen, but in the case of Figure 3, there is no place to attach the work equipment to the front, and only the work equipment is attached to the abdomen. This is when a rotary mower or the like is installed.

In this case, front PTO gearbox 1
The fixed gears 32, 36 and the front PTO shaft 11 in 2 are removed from the beginning, leaving only the driving part of the mid PTO pulley 27.

In addition, in the case of Fig. 4, there is no possibility that the abdomen-mounted work machine will be attached, and in this case,
The bevel gear chain and shaft 34 cannot be installed from the beginning.

In this way, internal parts are removed depending on the intended use, and the case 12a and lid 12b that make up the front PTO gearbox 12 are processed accordingly. In this way, front PTO devices with multiple specifications can be made using the same casting material.

As described above, the present invention provides a front
The PTO gear box is fixedly installed, and the front
Input to the PTO gearbox, the front PTO shaft protrudes to the front of the front PTO gearbox, and the shaft for fixing the mid PTO pulley protrudes downward, so one front PTO gearbox can be attached to the bottom of the front axle bracket. By simply fixing it, the front PTO shaft and the mid-PTO pulley for driving the abdomen-mounted work machine can be installed at the same time, making it possible to extract power in two directions with a compact configuration.

In addition, since the front PTO shaft was installed between the output pulley and the input pulley, the front PTO shaft could be placed in a position that met the standards, and since the V-belt between both pulleys was longer, a belt tension type A clutch device could be provided, and the mid PTO pulley could be placed as low as necessary.

[Brief explanation of the drawing]

Figure 1 is a front view of the front PTO device of the present invention, Figure 2 is an enlarged side sectional view, Figure 3 is a side sectional view when only the mid PTO pulley is used, excluding the front PTO shaft, and Figure 4 is a side sectional view of the front PTO device of the present invention. Mitsudo PTO
It is a side sectional view when the pulley is removed and only the front PTO shaft is left. 6...Front axle bracket, 11...Front PTO shaft, 12...Front PTO gear box, 13...Crankshaft extension shaft, 29...Mid PTO pulley.

Claims (1)

[Claims] 1. A front PTO gearbox is fixedly installed below the front axle bracket of an agricultural tractor, input is input to the front PTO gearbox from an extension shaft obtained by extending the engine crankshaft, and the front PTO shaft is protruded to the front of the front PTO gearbox. The front PTO device of an agricultural tractor is characterized by a shaft that protrudes downward to securely attach the Mid PTO pulley.