JPH068660B2 - Non-operation transmission of continuously variable transmission - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention rotatably has an input disk and an output disk on the jaw of an umbrella-shaped planetary cone arranged in a planetary manner, and a ring on the top surface. A differential planetary mechanism that presses each of them non-rotatably and moves the ring between the center point and the end of the top surface of the planet cone to change the rotational speed ratio of the input disk and the output disk. The present invention relates to a non-operation transmission of a continuously variable transmission, which is capable of performing gear shifting operation even when power is not connected between an input shaft and an output shaft of the continuously variable transmission.

(B) Conventional technology There have been various types of continuously variable transmissions, and each has its own advantages and disadvantages.

Among them, the input disc and the output disc are rotatably pressed against the jaws of the umbrella-shaped planetary cone arranged in a planetary manner, and the ring is non-rotatably pressed on the top face, and the ring is attached to the planetary planetary cone. A differential planetary mechanism type continuously variable transmission that changes the rotational speed ratio of the input disk and the output disk by moving between the center point and the end portion on the top surface of the cone (trade name; ring cone continuously variable transmission -Simpo Industry Co., Ltd.) is compact, but can transmit a large amount of power, can have a wide speed range, and can output 0 revolutions at times.
It may be used as a deceleration mechanism such as a transmission for various traveling workers.

That is, FIG. 8 is a cross-sectional view of a gearbox incorporating this continuously variable transmission. In this continuously variable transmission, an umbrella-shaped planet cone 1 is circumferentially arranged as a planet, and the jaw portions of the front and rear surfaces are arranged. The input disc 4 and the output disc 5 connected to the input shaft 2 and the output shaft 3, respectively, are pressed against each other, and the above-mentioned input disc 4 and output disc 5 and the method thereof are also attached to the top surface of the planet cone 1. The ring 6 is pressure-welded so that the linear force vector constitutes a closed system. As a result, when the position of the ring 6 on the planet cone 1 is changed, the rotation speed of the planet cone 1 is changed, and thus the output shaft 3 with respect to the input shaft 2 is changed.
This is a so-called differential planetary mechanism type in which the rotation speed ratio of changes.

In FIG. 8, the ring 6 is held by the holder 7 and is operated by an external operating device to change gears, and the changed power of the output shaft 3 is further transmitted to the following transmission system. .

(C) Problems to be solved by the invention However, the biggest drawback of this type of continuously variable transmission is that gear shifting cannot be performed unless power is connected from the input shaft 2 to the output shaft 3.

This is because if the power is cut off in the middle of the process, the contact pressure of the ring 6 on the planetary cone 1 is too high to move it.

Therefore, if the input is cut off for some reason while maintaining a high output speed, restarting
It was also dangerous because the high output speed before shutting off suddenly. In particular, in the case where this endless transmission is used for a transmission of a traveling worker, etc., this occurs when the vehicle restarts when it stops at a dangerous place such as in front of a river with a green moss, or when it stops due to an engine stall. Was very dangerous.

(D) Means for Solving the Problems Therefore, according to the present invention, an umbrella-shaped planetary arrangement is adopted for the planetary cone 1.
The input disc 4 and the output disc 5 are rotatably pressed against the jaws of the robot, and the ring 6 is non-rotatably pressed onto the top face, and the ring 6 is centered on the top face of the planet cone 1. In a continuously variable transmission of an operating planetary mechanism type in which the rotation speed ratio of the input disk 4 and the output disk 5 is changed by moving between the point and the end, the ring 6 co-rotates with the planetary cone 1. This problem has been solved by providing a power interruption mechanism that regulates and allows rotation freely.

(E) Action As a result, when the power system from the input shaft 2 to the output shaft 3 is once cut off, when the power interrupting mechanism is cut off and power is reintroduced into the input shaft 2, the ring 6 becomes the planetary cone 1. Since they rotate together, the driving force that the planet cone 1 should transmit to the output disc 5 is absorbed, but the upper ring 6 of the planet cone 1 can be moved and the gear shifting operation can be performed toward the low speed side. is there.

(F) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2 are partial cross-sectional views of a gear box showing a power connecting / disconnecting mechanism according to the present invention, and FIG. 3 is III of FIG.
-III sectional view, FIG. 4 is an enlarged view of IV portion of FIG.

In this embodiment, the dynamic connection between the output disc 5 and the output shaft 3 is configured as follows.

That is, the output disc 5 is loosely fitted to the output shaft 3 and is connected to the drive wheel 8 fixedly fitted to the output shaft 3 by the ball clutch mechanism 9.
Specifically, clutch pieces 5 (a) and 8 (a) are formed on the facing surfaces of the output disk 5 and the drive wheel 8, respectively, and a ball is placed between the clutch pieces 5 (a) and 8 (a). 10 is inserted. The output disk 5 is pressed by the spring 11 toward the planet cone 1 side, and the pressing force receives the reaction force from the planet cone 1, that is, the driving torque.

By the way, according to the present invention, in the continuously variable transmission having the above structure, the ring 6 is provided with the power connection / disconnection mechanism 12 for restricting and allowing co-rotation with the planet cone 1.

That is, when the ring 6 is rotatably held by the holder 7, the ball 13 is held on the sliding surface between the two 6 and 7.
This is made possible by interposing a ball and allowing the output of the ball 13 to be freely switchable with respect to the fitting groove 14 formed in the ring 6. At this time, when the ball 13 is moved in and out, a recessed groove 16 is formed in a portion of the holder shaft 15 through which the holder 7 is guided, and when the ball 13 is recessed in the recessed groove 16, the ball 13 is fitted. The ring 6 can be freely rotated out of the groove 14, but when the ball 13 is pushed out of the recessed groove 16, it is fitted into the fitting groove 14 on the ring 6 side, and the holder 7
It is conceivable that the fitting groove 14 is provided at several places on the circumference of the ring 6 so that this can be done immediately. The recessed groove 16 is provided at one place on the circumference of the holder shaft 15, and it is fitted to the ball 13 by fixing a lever 17 to the holder shaft 15 and rotating the lever 17. . However, since the holder 7 (ball 13 as well) slides on the holder shaft 15 in accordance with the shifting operation of the continuously variable transmission, the recessed groove 16 must be formed long in the axial direction so that the holder 7 can be moved.

In addition, since the ring 6 must rotate smoothly around the outer periphery of the planet cone 1, in order to do this smoothly, other than the holder 7, the meat parts of the case are extended to the outer periphery of the ring 6, Is used as a receiving portion 18, and the outer periphery of the ring 6 is supported by these in a balanced manner.
However, the ring 6 can be moved along with the gear shifting operation,
In this case as well, the width must correspond to the moving stroke of the ring 6 so that the receiving portion 18 can function sufficiently.

FIG. 5 is a sectional view of the essential part of another embodiment for restricting and allowing the free rotation of the ring 6. Here, a lock pin 19 is provided on the holder 7 side, and this lock pin 19 is provided on the outer circumference of the ring 6. This is made possible by allowing the fitting hole 20 formed to move back and forth. The lock pin 19 moves back and forth due to the rotation of the eccentric pin 21 and the like linked thereto, and the lock pin 19 is elastically urged in one direction (for example, the lock side) by the spring 22 and the like in order to ensure reliable operation. ing.

FIG. 6 and FIG. 7 are cross-sectional views showing the main part of still another embodiment. The combination of the lock pin 19 and the fitting hole 20 is the same. The difference is that the lever 23 and the like fitted to 15 and the like are used (the lever 23 is operated by the rotation of the lever 17 described above).

Due to the above, the power intermittent mechanism 12
If is cut off, the driving force transmitted from the planet cone 1 to the output disc 5 is absorbed because the output disc 5 does not rotate, but the planet cone 1 and the ring 6 come into contact with each other and rotate together. Therefore, the movement of the ring 6, that is, the shift operation can be performed.

(G) Effect of the Invention As described above, in the continuously variable transmission having the above-described structure, the present invention provides the power connection / disconnection mechanism 12 for restricting and allowing co-rotation with the planet cone 1 to the ring 6 for controlling the speed change. Since it is provided, the gear shifting operation can be performed by the above-mentioned function even when the power of the input shaft 2 is not transmitted to the output shaft 3.

Furthermore, when this continuously variable transmission is used for a mission of a traveling work vehicle, when the vehicle restarts after being stopped halfway due to an engine stall, etc.
By disconnecting the power connection / disconnection mechanism 12 once, taking in an input, moving the ring 6 to the low speed side, and then connecting the power connection / disconnection mechanism 12, it is possible to start at a low speed. In this case, by interlocking the engine restart operation with the disconnection operation of the power interrupting mechanism 12, the situation in which the power interrupting mechanism 12 is not disconnected but suddenly restarts at the speed before the stop is eliminated.

Further, in the gear box described above, the forward / reverse switching mechanism 24 by means of a gear slide is provided on the downstream side of the output shaft 3 of the continuously variable transmission (see FIG. 8), but in this case, the output shaft 3 has a very high speed. When it is rotating with, the gear cannot be slid (forward / reverse cannot be switched).

However, in this case, the rotation of the output shaft 3 and the like is reduced by disconnecting the power connection / disconnection mechanism 12.
You can operate 24. Therefore, as in the past,
Operate the continuously variable transmission to the low speed side once
There is no need for troublesome operations such as switching between and switching to the high speed side again.

[Brief description of drawings]

1 and 2 are partial sectional views of a power connection / disconnection mechanism of a continuously variable transmission according to the present invention, and FIG. 3 is a sectional view taken along the line III-III of FIG.
FIG. 4 is an enlarged view of IV part of FIG. 3, FIG. 5 is a sectional view showing a main part of another embodiment of the power connecting / disconnecting mechanism, and FIGS. 6 and 7 are main parts of still another embodiment. The sectional view shown in FIG. 8 is a sectional view of a gear box incorporating a continuously variable transmission. (Reference number) 1 planetary cone 6 ring 4 input disc 12 power interruption mechanism 5 output disc

Claims (1)

[Claims] 1. An input disk (4) and an output disk (5) are rotatably mounted on a jaw of an umbrella-shaped planetary cone (1) arranged in a planetary manner.
Further, the ring (6) is press-contacted to the top surface in a non-rotatable manner, and the ring (6) is moved between the center point and the end portion on the top surface of the planetary cone (1) to thereby input the input circle. In a continuously variable transmission of a differential planetary mechanism type that changes the rotational speed ratio of the plate (4) and the output disc (5), the ring (6) is restricted from co-rotating with the planetary cone (1). , A non-operating transmission of a continuously variable transmission, which is provided with a power disconnecting mechanism (12) which is allowed.