JPS5851617Y2 - PTO shaft transmission device for agricultural tractors - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for transmitting power to the PTO shaft of an agricultural tractor.

Generally speaking, the PTO shaft of an agricultural tractor has a standard rotation speed of 55 mm, which is a standard rotation, that is, a relatively low speed rotation, depending on the work equipment to which it is attached.
A 40 rpm type and a high speed 1.000 rpm type are used.

In this case, if the combination of the PTO axis and the work equipment is incorrect, there is a risk of damage to the work equipment, etc. Therefore, in the United States,
The PTO axis of 540 rpm is a square spline, and 1.00
The PTO axis of Orpm is designed to be an involute spline to prevent misuse of both.

The present invention allows these two types of PTO shafts with different rotation speeds to be exchanged with each other, and even when either the high speed PTO shaft or the low speed PTO shaft is installed, it is possible to do so without performing any operations. It is an object of the present invention to provide a transmission device for a PTO shaft that can reliably transmit a predetermined rotational speed.

The structure of the present invention will be explained based on drawings showing one embodiment. As shown in FIG. 1, 1 is a rear axle case attached to the rearmost part of the tractor body; A cylindrical PTO pinion shaft 5 is inserted between the PTO shaft case 2 and the rear axle case 1 at the upper part of the PTO shaft case 2 via bearings 3 and 4. Two high and low speed pinions 6.7, large and small, are formed on the outer periphery of this PTO pinion shaft 5.

8 is mounted as a shaft within the rear axle case 1, and transmits power from the front engine (not shown) to the PTO pinion shaft 5.
A spline 9 is formed at the rear end and is fitted to the PTO pinion shaft 5 to rotate integrally with the PTO pinion shaft 5.

10 is a relatively small-diameter high-speed PTO gear that meshes with the large-diameter high-speed pinion 6 of the two pinions 6.7, and its boss 11 is protruded from one side □, , the support wall 1a of the rear axle case 1
is supported via a bearing 13, and on the inner periphery of the post 11,
A relatively small-diameter spline 14 is formed as an engaged portion, and a needle bearing 15 is fitted on the outside.

On the other hand, 16 is a relatively large-diameter low-speed PTO gear that meshes with the small-diameter low-speed pinion 7, and like the high-speed PTO gear 10, its boss 17 protrudes 17a to one side; button, it is pivotally supported via a bearing 19 on a cylindrical support wall 18 protruding inwardly of the PTO shaft case 2, and is thus arranged concentrically with the high-speed PTO gear 10, and the post The above-mentioned high-speed PTO is installed on the inner circumference of 1st floor.
A spline 20 is formed as an engaged portion having a larger diameter than the spline 14 of the gear 10.

21 indicates a thrust bearing interposed between both PTO gears 10 and 16.

In addition, this support wall 18 of the PTO shaft case 2 includes a PTO
A cylindrical shaft 22 into which the shaft is inserted and mounted is rotatably mounted via a bearing 23.

24 is an annular presser foot attached to the outside of the PTO shaft case 2 to press down the bearing 23, and 25 is an oil seal interposed between the presser foot 24 and the cylindrical shaft 22.

1. The button shown in Fig. 1 is a 540r equipped with a square spline 27 at the connection part 26 with the work machine.
pm low speed PTO shaft 28, this PTO shaft 28
The mounting shaft 29 connects both PTO gears 10, 16 from the cylindrical shaft 22.
The tip passes through the boss IL17, and its tip is removably fitted into the needle bearing 15.

The PTO shaft has a large diameter at a position corresponding to the spline 20 formed on the inner circumferential surface of the post 1 of the low-speed PTO gear 16, and a spline 31 as an engaging portion is formed on the large diameter portion 30. is formed and engages with the spline 20 of the boss 17, but no spline is formed in the small diameter portion 32 corresponding to the spline 14 formed on the inner peripheral surface of the post 11 of the high-speed PTO gear 10. The high-speed PTO gear 10 and the low-speed leg TO shaft 28 are relatively loosely fitted.

Therefore, this low-speed PTO shaft 28 is similar to the high-speed PTO shaft 28.
Power is not transmitted from gear 10, and low-speed PTO gear 1
In this way, the PTO shaft 28 rotates together with 5.
It rotates at a low speed of 40 rpm.

The button 33 is a locking protrusion formed on the inner circumferential surface of the inner end of the cylindrical shaft 22, and is connected to the spline 3 of the low-speed PTO shaft 28.
1 and rotate together.

On the other hand, FIG. 2 shows a case where a high-speed PTO shaft 36 having an involute spline 35 is installed in the connection part 34 with the working machine in place of the low-speed PTO shaft 28, and is installed in the same manner as described above. The mounting shaft 37 is removably inserted,
A spline 39 as an engaging portion is formed in a small diameter portion 38 corresponding to the spline 14 formed on the inner peripheral surface of the post 11 of the high-speed PTO gear 10, and is engaged with the spline 14 of the boss 11. However, there is no spline in the large diameter portion 40 corresponding to the inner peripheral surface of the post 1 of the low speed PTO gear 16, and the low speed PTO gear 16 and the high speed PTO shaft 36 are loosely fitted into each other. be.

Therefore, this high-speed PTO shaft 36 rotates together with the high-speed PTO gear 10, and in this way, the PTO shaft 36 rotates together with the high-speed PTO gear 10.
6 rotates at a high speed of 1,000 rpm.

In this high-speed PTO shaft 36, the cylindrical shaft 2
A special spline 41 that engages the second engagement protrusion 33 is a feature.

To replace both PTO shafts 28 and 36,
If you pull out one PTO shaft and insert the other PTO shaft and install it, in the case of the low speed PTO shaft 28, the spline 31 of the mounting shaft 29 will be connected to the spline 2 of the low speed gear 16.
0, in the case of the high-speed PTO shaft 36, the spline 39 of the mounting shaft 37 is connected to the spline 1 of the high-speed PTO gear 10.
4, the predetermined rotational speed is reliably transmitted without any special operation.

Therefore, in the present invention, the PTO shaft for high speed and the PTO shaft for low speed are
Not only can the TO shafts be replaced with each other, but the high-speed PTO shaft has an engaging part that engages only with the engaged part of the high-speed PTO gear. Since the TO shaft is provided with an engaging part that engages only with the engaged part of the low-speed PTO gear, both PT
There is no need to perform any operations when replacing the O-axis, and the specified rotation speed is reliably transmitted, eliminating the risk of high-speed rotation being mistakenly transmitted to the low-speed PTO shaft, and other significant effects can be obtained. This is what was created.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of the moving parts of the PTO shaft transmission part showing one embodiment of the present invention. 10.16...PTO gear, 11,17...boss,
14.2G, 31.39...Spline, 28.36
...PTO axis.

Claims (1)

[Scope of utility model registration request] At least two PTO gears that are arranged concentrically and have different rotation speeds, each having an engaged portion formed on the inner peripheral surface of the boss, and at least two PTO gears that are removably fitted into both bosses of these PTO gears. The PTO axis and these PT
Of the two bosses, one of the PTO shafts of the O-axis is
An engaging part that engages only with one boss is formed on the other PTO shaft, and an engaging part that engages only with the other boss is formed on the other PTO shaft.
A PTO shaft transmission device for an agricultural tractor, characterized in that the TO shaft is replaceable.