JPS6237009Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a belt-type continuously variable transmission used for mobile agricultural machinery, particularly tailors, and more particularly to the arrangement of a continuously variable transmission having an intermediate shaft.

Generally, Taylor 1, as shown in FIG.
An engine 5 is attached to a fuselage 3 supported by wheels 2.
is mounted, and is transmitted from the output shaft 5a of the engine 5 to the intermediate shaft 7 via the belt-type continuously variable transmission 6, and further transmitted from the intermediate shaft 7 to the main shaft 10a of the transmission 10 via the belt 9. , power is transmitted to the wheels 2.

By the way, conventionally, the continuously variable transmission 6' has a pulley 12 having a cam 11 mounted on the engine output shaft 5a, and a pulley 15 having a spring 13 mounted on the intermediate shaft 7, as shown in FIG. . Therefore, the pulley 12 is disposed outward from the end surface B of the engine 5 by the mounting portion of the cam 11, and the continuously variable transmission 6' is disposed only by the cam installation space A.
The belt protrudes outward, resulting in a disadvantage that the volume of the belt transmission portion including the cover 16 becomes large.

Therefore, the present invention is based on engine 5 and transmission 1.
An intermediate shaft 7 is disposed in the space between the engine end face B and the intermediate shaft 7, and the intermediate shaft is supported by a mounting bracket disposed inside the body from the engine end surface B, and the operating cam portion of the belt type continuously variable transmission 6 is connected to the intermediate shaft. It is an object of the present invention to provide a belt-type continuously variable transmission device for a mobile agricultural machine, which is constructed by disposing the pulley on the inside of the machine body on the pulley 7 and eliminates the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.

The belt-type continuously variable transmission device 6 includes a driving pulley 1
7, driven pulley 19 and both pulleys 17,
The driving pulley 17 is attached to the output shaft 5a of the engine 5, and the driven pulley 19 is attached to the intermediate shaft 7. The intermediate shaft 7 is disposed in a space S between the engine 5 and the transmission 10, and is rotatably supported via a bearing 22 by a mounting bracket 21 disposed across the engine 5 and the transmission 10. At the same time, the mounting bracket 21 is located at a position that is closer to the center of the fuselage 3 than the end surface B of the engine 5. The drive pulley 17 has a fixed sheave 17a and a movable sheave 17b.
is located outside the fuselage and is biased by a spring 23 in a direction toward the fixed sheave 17a. On the other hand, the driven pulley 19 also has a fixed sheave 19.
a and movable sheave 19b, fixed sheave 1
The boss 9a is fixed to the intermediate shaft 7 on the distal end side of the intermediate shaft 7, that is, on the outside of the body 3. Further, the movable sheave 19b is located inside the fuselage 3 and the intermediate shaft 7
It is slidably fitted into the movable cam 25 and connected to the movable cam 25 via a bearing 26. Furthermore, the movable cam 25 connects a wire extending to the operating section C (see FIG. 1) of the tailor 1 at its lever section 25a, and engages with a fixed cam 27 fixed to the mounting bracket 21. Both cams 25 and 27 constitute an operating cam portion of the continuously variable transmission 6. Further, a pulley 29 is attached to the tip of the boss of the fixed sheave 19a, and the pulley 29 is interlocked with a pulley 30 installed on the main shaft 10a of the transmission 10 via the belt 9. Further, a tension pulley 32 is connected to and in rolling contact with the belt 9, and the tension pulley 32 is operated toward and away from the belt 9 by an operating portion C, thereby forming a main clutch.

Since this embodiment has the above-described configuration, the rotation of the engine 5 is transmitted from the output shaft 5a to the drive pulley 1.
7 and further transmitted to the driven pulley 19 via the belt 20. And the driven pulley 1
9 is rotated by the main shaft 10a of the mission 10 via the intermediate shaft 7, pulley 29, belt 9, and pulley 30.
The transmission is further transmitted to the wheels 2 after being appropriately changed in speed by the transmission 10. Further, when the movable cam 25 located in the space S is rotated by operating the operating part C of the tailor 1, the engagement position with the fixed cam 27 changes and the movable cam 25 moves in the axial direction. As a result, the movable sheave 19b moves in the axial direction via the bearing 26, and the effective diameter of the driven pulley 19 changes. At the same time, as the effective diameter of the driven pulley 19 changes, the movable sheave 17b of the driving pulley 17
moves against or in accordance with the spring 23, whereby the rotation of the engine output shaft 5a is transmitted to the intermediate shaft 7 in a continuously variable manner.

As explained above, according to the present invention, the intermediate shaft 7 is disposed in the space S between the engine 5 and the mission 10, and the mounting bracket 21 is arranged such that the intermediate shaft is disposed inside the fuselage from the engine end surface B.
Since the operating cam parts 25 and 27 are arranged inside the body of the pulley 19 on the intermediate shaft 7, the positions of the pulleys 17 and 19 are not affected by the length of the operating cam parts 25 and 27. By preventing the continuously variable transmission device 6 from protruding outward, the belt transmission portion can be made significantly more compact. Furthermore, since the operating cam parts 25 and 27 are arranged inside the intermediate shaft 7, it is easy to take out the connecting wire etc. from the cam part, which simplifies the structure and prevents speed change operation due to wire interference. Defects can be prevented. Furthermore, in general, in the mobile agricultural machine 1, at high speeds, the load is small due to road running, etc., and at low speeds, high loads are applied due to rotary work, etc.; Due to the arrangement, a spring 23 is disposed on the driving pulley 17. Therefore, during low-speed transmission when the effective diameter of the driving pulley 17 is small, the spring 23 is compressed, and the spring 23 is compressed.
Based on this, the belt clamping force of both sheaves 17a and 17b is increased, belt slip can be prevented and transmission efficiency can be improved.

[Brief explanation of the drawing]

Fig. 1 is an overall side view showing a tailor to which the present invention can be applied, Fig. 2 is a plan sectional view showing a conventional example of a belt type continuously variable transmission, and Fig. 3 is a plan sectional view showing an embodiment of the present invention. , FIG. 4 is a side view thereof. 1... Mobile agricultural machine (Taylor), 3... Aircraft, 5
...Engine, 6...Belt type stepless device, 7...
Intermediate shaft, 9... Belt, 10... Mission, 1
0a...Main shaft, 19...Pulley, 21...Mounting bracket, B...Engine end face, S...Space part.

Claims (1)

[Scope of utility model registration request] In the mobile agricultural machine 1, the rotation of the engine 5 is transmitted to the intermediate shaft 7 via the belt-type continuously variable transmission 6, and further transmitted from the intermediate shaft to the main shaft 10a of the transmission 10 via the belt 9. The intermediate shaft 7 is disposed in the space S between the transmission 10 and the intermediate shaft 7, and the intermediate shaft is supported by a mounting bracket 21 disposed inside the body from the engine end surface B, and the operating cam portion of the belt type continuously variable transmission 6 is provided. 2
5 and 27 are arranged inside the body of the pulley 19 on the intermediate shaft 7.