JPS6114906Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a front power take-off pulley drive device located below a radiator at the front of an agricultural tractor.

Conventionally, agricultural tractors have been equipped with a front power take-off pulley at the front of the tractor to transmit power to the work equipment when the work equipment is connected to the front of the tractor. , a radiator fan drive pulley is connected to the engine crankshaft, and the pulley is configured to drive the front power take-off pulley via a transmission joint located below the radiator, but the transmission joint is located below the radiator. The disadvantage was that metal corrosion was likely to occur due to water leakage from the radiator. Therefore, in the 1970s,
As disclosed in Publication No. 139605, it was considered to protect the transmission joint by surrounding it with a bellows pipe to prevent water leakage, etc., but this method simply surrounded and protected the transmission joint with such a bellows pipe. However, there is a problem in that good lubricity of the transmission joint cannot be ensured.

In other words, the transmission joint is constructed so that its transmission function can be ensured by having both ends spline-fitted to the outer circumferential surface of the coupling boss and the outer circumferential surface of the pulley shaft proximal end boss so as to be slidable. Therefore, it is necessary to constantly fill such spline fitting parts with grease as a lubricating oil to ensure smooth sliding movement and to maintain the oil-tightness of the transmission joint itself. However, simply surrounding the transmission joint with a bellows tube does not satisfy these requirements.

Therefore, in the present invention, a boot made of a flexible elastic material is tightly covered and fitted onto the outer peripheral surface of a transmission shaft with spline fitting at both ends constituting a transmission joint, and both ends of the boot are fitted with a coupling. It is fitted onto the outer peripheral surface of the boss and the outer peripheral surface of the pulley shaft proximal end boss, and a space is formed between the inner surface of both ends of the boot and the spline fitting parts at both ends of the transmission joint, and the space is used as a grease filling part. Furthermore, by configuring the fitting parts at both ends of the boot to be able to be flipped outward, the drawbacks of the conventional technology are eliminated, and the front power take-off pulley drive for an agricultural tractor has good oil-tightness and ease of grease filling. The aim is to provide the equipment.

An example of this invention will be explained in detail based on the drawings.
A shows the front part of the agricultural tractor, that is, the part covered by the bonnet. Reference numeral 1 denotes a bonnet, 2 a bracket, and 3 an engine section, which has an oil pan 4 below, and a crankshaft 5 that protrudes forward below the engine section and is connected to a pulley 6 for driving a radiator fan. 7 is the radiator, 8
Reference numeral 9 indicates a radiator fan located at the rear of the radiator, 9 indicates a fan pulley provided on the radiator fan 8, and 10 indicates a radiator fan belt suspended between the fan pulley 9 and the radiator fan driving pulley 6. Reference numeral 11 denotes a front power take-off pulley provided at the front of the tractor, and is a power take-off pulley for transmitting power to the work machine when the work machine is connected to the front of the tractor. 12 is a frame body 13 located at the rear of the front power take-off pulley 11
This is a shaft cover that is integrally connected to the shaft by bolts. Reference numeral 14 denotes a pulley shaft connected to the front power take-off pulley 11, which is configured to transmit rotation of the pulley shaft to the pulley through spline fitting with the front power take-off pulley 11. The shaft cover 12 is provided to cover the pulley shaft 14, and a ball bearing 15 is installed between the shaft cover 12 and the pulley shaft 14.
It also supports the shaft together with the shaft cover.

B is a radiator fan drive pulley 6;
This is a transmission joint interposed between the power take-off pulley 11 and the front power take-off pulley 11, and this invention relates to this transmission joint B. The transmission coupling B is a transmission coupling having a coupling boss 16 integrally fixed to the radiator fan drive pulley 6 and a spline groove at one end that is spline-fitted via a ball 17 into a spline groove provided on the inner peripheral surface of the boss. A ball 1 is inserted into the shaft 18 and the spline groove provided at the other end of the transmission shaft 18.
A pulley shaft base end boss 19 having a spline groove to be spline-fitted via a spline 7', and a boot 2.
0. And the same boots 20
is made of a flexible elastic material, and the central part is connected to the transmission shaft 18.
At the same time, both ends of the boot 20 are fitted onto the outer circumferential surface of the coupling boss 16 and the outer circumferential surface of the pulley shaft base end boss 19, and both ends of the boot 20 are fitted tightly onto the outer circumferential surface of the boot 20. A space 21 is formed between the inner surface and the spline fitting parts at both ends of the transmission joint B, and the space 21 is used as a grease filling part, and the fitting parts at both ends of the boot 20 can be turned outward. It consists of

In addition, in order to be able to turn both ends of the boot 20 outward, the coupling boss 16 and the pulley shaft base end boss 1 are connected to each other.
9, the both ends of the boot 20 are tightened to the outer circumferential surface of the boss with an extensible annular body 22, and the annular body 22 is expanded as required for grease filling. Flip it outward to fill the spline portion with grease.

Therefore, the action of the transmission joint B is that as the radiator fan driving pulley 6 rotates, the transmission shaft 18 is spline-fitted with the coupling boss 16.
is rotated, and is interlocked with the base end of the power take-off pulley shaft which is also spline-fitted from the same transmission shaft 18',
It rotates the front power take-off pulley 11, and in particular, the boot 2 is made of a flexible elastic material.
0 is integrally attached to the transmission shaft 18 of the transmission joint, it has good oil tightness and can completely block water leakage from the upper radiator. A grease-filled part is formed between the spline fitting parts at both ends of the
In addition, since the fitting portions at both ends of the boot can be turned outward, the grease filling operation can be easily performed.

In particular, in the spline fitting portion at both ends of the transmission shaft, the space serving as the grease filling portion is constantly filled with grease as lubricating oil, and in order to ensure reliable grease retention, grease is injected frequently. Even without this, the sliding movement of the transmission shaft at the fitting part can be made smooth and the transmission function can be ensured. Moreover, even when filling with grease, the fitting parts at both ends of the boot can be easily moved. Since the grease filling portion can be easily opened by simply flipping it outward, the grease filling operation can be performed quickly and reliably.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of the front power take-off pulley drive device of the agricultural tractor of the present invention. FIG. 2 is an enlarged cross-sectional view of the main part of the project. FIG. 3 is a sectional view taken along the line of FIG. 2. 6: Radiator fan drive pulley, 7: Radiator, 11: Front power take-off pulley, 1
4: Pulley shaft, 15: Ball bearing, B:
Transmission joint, 16: Coupling boss, 17: Ball, 18: Transmission shaft, 19: Pulley shaft base end boss,
20: Boots.

Claims (1)

[Scope of utility model registration request] In a front power take-off pulley drive device, a radiator fan drive pulley 6 is connected to the engine crankshaft 5, and a front power take-off pulley 11 is interlocked and connected to the pulley 6 via a transmission joint B located below the radiator 7. A boot 20 made of a flexible elastic material is closely fitted onto the outer peripheral surface of the transmission shaft 18 with spline fitting at both ends constituting the transmission joint B.
are fitted onto the outer circumferential surface of the coupling boss 16 and the outer circumferential surface of the pulley shaft proximal end boss 19, and there is a space between the inner surface of both ends of the boot 20 and the spline fitting portions at both ends of the transmission coupling B. 21, the same space 21 is used as a grease filling part, and the same boot 2 is formed.
0. A front power take-off pulley drive device for an agricultural tractor, which is configured such that fitting portions at both ends can be turned outward.