JP2633193B2 - Farm tractor front PTO device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front PTO for transmitting power to a working machine mounted on the front or abdomen of an agricultural tractor.
It relates to the structure of the device.

[0002]

2. Description of the Related Art Conventionally, as a method of supporting a front PTO pulley to a body of a front PTO device,
JP-A-59-100019 and JP-A-56-56.
No. 430, Japanese Utility Model Application Laid-Open No. 58-22324, Japanese Utility Model Application Laid-Open No. 58-80322, Japanese Utility Model Application
No. 26, Japanese Utility Model Application Laid-Open No. 56-83430, and Japanese Utility Model Application Laid-Open No. 57-200428 are known.

[0003]

According to the present invention, power is taken out from the front of the engine, and the power is introduced into a cylindrical center pin through a front PTO pulley 17 disposed at a position above and in front of a center pin bracket. Fitted PTO
The power transmission shaft enables power to be transmitted to a rotary mower device mounted on the abdomen of the tractor, and enables the rotary mower device mid-mounted on the abdomen to be driven without difficulty. In addition, since the PTO pulley bracket 7 for pivotally supporting the shaft 9 is disposed on the shaft 9 supporting the front PTO pulley 17 of the agricultural tractor, the present invention provides the same structure as the conventional belt tension clutch. This eliminates the problem of clutch connection / disconnection, which occurs because the distance between the shafts changes due to the expansion and contraction of the vibration isolating rubber of the engine. The difficulty in arranging the front differential case 2b for driving the front wheels, which is caused by penetrating the PTO power transmission shaft 23 inside the cylindrical center pin 1, is explained by the fact that the center pin fitting cylinder 2a of the front axle case 2 This problem has been solved by integrally forming the structure, and the agricultural tractor equipped with the rotary mower device has a four-wheel drive to increase the traction force.

[0004]

The object of the present invention is as described above. Next, a configuration for achieving the object will be described.
Center pin bra located at the lower front of the bonnet 11
The front axle case is located at the left and right center positions of the
A cylindrical center pin 1 for pivotally supporting the center of
Front axle case 2
Is loosely fitted with a center pin fitting cylindrical portion 2a formed by a part of
The part eccentric from the center pin fitting cylinder 2a
The front differential case 2b
, The front wheel drive force is input from the rear with the front wheel drive shaft 25,
Further, a PTO power transmission shaft is provided inside the cylindrical center pin 1.
23, and the rear of the PTO power transmission shaft 23
Rotary mower mounted on the abdomen of an agricultural tractor
The power transmission shaft 2 is configured to transmit power to the
The front end of the pulley 18 of the engine 3 has an engine 13
On the shaft 9 connected to the front end of the crankshaft S
V belt 41 is wound around the PTO pulley 17
Transmits force and supports the front PTO pulley 17
A PTO pulley bracket 7 pivotally supporting the shaft 9
Is arranged .

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The purpose and configuration of the present invention are as described above. Next, the configuration of the embodiment shown in the accompanying drawings and the operation of the invention will be described. 1 is an overall side view of an agricultural tractor on which a front PTO device of the present invention is arranged, FIG. 2 is an enlarged cross-sectional view of a front PTO device portion, FIG. 3 is a front view of the same, FIG. It is a figure and a front view.

In FIG. 1, an engine 13 is disposed in a hood 11 of an agricultural tractor, and the rotation of a crankshaft S of the engine 13 is transmitted from a rear HST transmission 16 to a transmission case M, and a rear wheel is driven. It is driving. Also, the crankshaft S of the engine 13
, The front PTO pulley 17 is driven via a joint 28. Front PTO pulley 1
7 transmits power to a counter pulley 18, and drives a rotary mower device 14 via a power transmission shaft 23. Further, an axis X of a radiator fan F is arranged at an upper portion of the engine 13, and the radiator fan F
The radiator R disposed behind the engine 13 is cooled. Therefore, the radiator R is the radiator fan F
Is arranged above, so that it is arranged above itself in the hood 11.

[0007] The PTO power transmission shaft 23 is supported by bearings on the inner diameter of the cylindrical center pin 1 and has a joint 22 at the rear end.
And the shaft 15 are input to the bevel gear box 35 of the rotary mower device 14. Also, the HST transmission 16
The rotation after shifting is input from the front wheel drive shaft 25 to the eccentric gearbox 19, and further transmitted from the eccentric gearbox 19 to the front differential case 2b. The front differential case 2b is deviated to the right from the center of the fuselage, and the center pin 1 and the PTO power transmission shaft 23 are bearing-supported at the center of the fuselage. Front axle case 2
The front axle shaft 5 passes through the inside. 12 is a front wheel.

2 and 3, the front PTO pulley 1
Reference numeral 7 denotes a support lubrication structure around the center pin 1 together with a support structure for the counter pulley 18 and the like. A horizontal bracket 10 is provided on a body frame 30 extending from the front end to the rear end of the body, and a PTO pulley bracket 7 is fixed to a front surface of the horizontal bracket 10. In this embodiment, the PTO pulley bracket 7 is formed in a U-shape. A shaft 9 connected to a joint shaft 28 is supported on the bracket 7 by bearings.
8 is fixed. Then, the electromagnetic clutch device 38 and the front PTO pulley 17 are disconnected and connected to transmit power. A V-belt 41 is wound between the front PTO pulley 17 and the counter pulley 18, and the tension pulley 8 is pressed against the V-belt 41. The arm 45 and the boss portion 32 of the tension pulley 8 are provided with the bolt screw shaft 3 for fixing the safety cover 21 of the counter pulley 18.
3 is freely pivoted. The front PTO shaft 6 is connected to the front surface of the counter pulley 18.

A center pin 1 pivotally supporting the center of the front axle case 2 is fixed to a center pin bracket 20, and the center pin bracket 20 is formed in an inverted U-shape and fixed to a body frame. The center pin bracket 20 is provided with a power transmission shaft bearing on its inner diameter.
The cylindrical center pin, which is supported and supported in the structure, is inserted and fixed. At the time of the insertion, the center pin fitting cylindrical portion 2a of the front axle case 2 is loosely supported on the outer periphery of the cylindrical center pin 1 via bearings 37 and 39. Bearing 3
Is a radial ball bearing, bearing 4 is a needle bearing,
The bearings 37 and 39 are constituted by bushes. The lubrication of the bearings 3, 4, 37, and 39 of the center pin support portion is performed smoothly, and a grease nipple 27 is provided in the center pin fitting cylindrical portion 2a as a lubrication supply oil. The grease injected from the grease nipple 27 lubricates the bearings 37 and 39 constituted by the bush, and further lubricates the lubricating oil holes 1 opened in the cylindrical center pin 1.
A, 1a, 1a, and 1a are configured so that liquefied lubricating oil passes therethrough to lubricate the bearings 3, 4.

Referring to FIG. 3, a front PTO shaft 6 and a safety cover 21 of a counter pulley 18 are fixed to the front surface of a center pin bracket 20 by mounting bolts 40 and 43, and a bracket protruding from the center pin bracket 20. It is fixed to 49 by bolts 44. Among them, the bolt screw shaft 33 of the mounting bolt 40 is configured as a pivot shaft for the boss 32 of the tension pulley 8. After the boss 32 is fitted to the bolt screw shaft 33, the mounting bracket of the safety cover is applied to the boss 32 and tightened with the mounting bolt 40 to prevent the boss 32 from coming off. 46 is an urging spring of the tension pulley, and 47 is an urging force adjusting bolt. In the overall configuration as described above, the present invention provides a PTO pulley bracket 7 that supports the front PTO pulley 17 and the electromagnetic clutch 38 integrally.
Was fixed to the front surface of the horizontal bracket 10. The horizontal bracket 10 is connected to the left and right body frames 30L, 30L.
R is fixed horizontally in the middle of the R, and its lower end is fixed to a part of the center pin bracket 20 to improve its strength.

The horizontal bracket 10 is shown in FIGS.
The electromagnetic clutch 38 is configured as shown in FIG.
In order to be easily attached to the front of the horizontal bracket 10 in a state of being integrated with the O pulley 17, mounting bolts 7d,
The insertion holes 7a, 7b, 7c, 7e of 7d, 7d, 7d are arranged further outside the outer periphery of the electromagnetic clutch. The threaded nuts 10a, 10b, 10c, 10e of the mounting bolts 7d, 7d, 7d, 7d are fixed to the rear surface of the horizontal bracket 10 to facilitate mounting from the front surface.

[0012]

The present invention is constructed as described above, and has the following effects. First, agricultural tractors
The shaft 9 supporting the front PTO pulley 17 of the
The PTO pulley bracket 7 that supports the shaft 9 is arranged.
So, like a conventional belt tension clutch,
The distance between the upper and lower shafts changes due to the
Eliminates the problem of clutch connection and disconnection that occurs due to
Bell when configured with belt tension clutch
This is to eliminate the decrease in the durability of the device.

Second, a PT is provided inside the cylindrical center pin 1.
O generated by penetrating the O power transmission shaft 23
The difficulty of arranging the front differential case 2b for wheel drive
Center pin fitting cylinder portion 2a of front axle case 2
The rotary mower can be eliminated by forming
Configure the agricultural tractor equipped with the device to four-wheel drive,
The traction is increased.

[Brief description of the drawings]

FIG. 1 is an overall side view of an agricultural tractor on which a front PTO device of the present invention is arranged.

FIG. 2 is an enlarged sectional view of a front PTO device.

FIG. 3 is a front view of the same.

FIG. 4 is a side view of the PTO pulley bracket 7;

FIG. 5 is a front view of the PTO pulley bracket 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical center pin 2 Front axle case 2a Center pin fitting cylinder part 2b Front differential case 7 PTO pulley bracket 17 Front PTO pulley 18 Counter pulley 20 Center pin bracket 23 PTO power transmission shaft 30L, 30R Airframe

Claims (1)

(57) [Claims] 1. A sensor disposed at a lower front portion of a bonnet 11.
The front pin is located at the center
Cylindrical center pin 1 pivotally supporting the center of axle case 2
Is fixed to the outer periphery of the cylindrical center pin 1,
Center pin fitting cylinder part which is formed as a part of xle case 2
2a, and is eccentric from the center pin fitting cylinder 2a.
The front differential case 2b is formed in the
The front wheel drive shaft 25 drives the front wheel drive shaft
Power is input, and P is inserted into the cylindrical center pin 1.
The TO power transmission shaft 23 is supported by bearings, and the PTO power transmission shaft
23 from the rear, attached to the abdomen of the agricultural tractor
The PTO is configured to transmit power to the tallymore device 14,
On the counter pulley 18 at the front end of the power transmission shaft 23,
Connected to the front end of the crankshaft S of the engine 13
V belt 41 from front PTO pulley 17 on shaft 9
To transmit power, and the front PTO pulley 1
A PTO pulley for pivotally supporting the shaft 9
A front PTO device for an agricultural tractor, wherein a bracket 7 is arranged .