JPS5840373Y2 - Continuously variable transmission gear change operation device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a speed change operation device for a continuously variable transmission.

It is well known that an air cylinder is used as a speed change operation device for a continuously variable transmission, but since an air cylinder is generally only capable of forward and backward movement within a preset range, it is required to be able to stop freely at any position. It was unsuitable for continuously variable speed operation.

Therefore, there are systems that incorporate a pressure increase mechanism into the air cylinder as a means to stop the air cylinder at an arbitrary position, but these have the drawbacks of not only making the device extremely large, but also making it structurally complex and expensive. was there.

This idea has a structure that allows you to freely stop at any position, which not only allows for effective continuously variable speed operation, but also has a small size.
Moreover, it provides inexpensive products.

One embodiment of the invention will be described below with reference to the drawings. The drawing shows an example in which the device of this invention is incorporated into the drive side V-pulley of a belt-type continuously variable transmission, and 1 indicates the drive side pulley 1. A conical plate 2 is a movable conical plate facing the fixed conical plate 1, and 3 is an air cylinder provided on the same axis as the driving side pulley. The piston 4 and the movable conical plate 2 are fixedly connected in the axial direction, but maintain a free relationship in the rotational direction so as to interlock with each other.

Reference numeral 6 denotes an outer shell of the air cylinder 3, inside which an oil chamber 1 and an oil tank 8 are provided, and these are communicated through a communication passage 9.

The communication passage 9 includes a through hole 9a that connects the oil chamber 7 and the valve chamber 10, a through hole 9b having a valve seat that connects the valve chamber 10 and the pilot piston chamber 11, and a through hole 9b that connects the pilot piston chamber 11 and the oil tank 8.
It is formed by a through hole 9c that connects the two.

Further, the other end 4 of the piston 4 of the air cylinder 3
A is inserted into the oil chamber 7 in an airtight manner so as to function as a hydraulic piston.

Reference numeral 12 denotes a check valve installed in the valve chamber 10 in the middle of the communication passage 9 connecting the oil chamber 7 and the oil tank 8, and has a structure in which the ball valve approaches and separates from the valve seat of the through hole 9b. The pilot piston 13 is operated by compressed air from the air port 14 in conjunction with the pilot piston 13 provided in the pilot piston chamber 11 to suppress and open the ball valve. port 1
The piston 4 can be moved forward and backward by supplying and disconnecting compressed air from the air port 16.

Reference numeral 17 denotes a guide shaft integrally formed with the outer shell 6 of the air cylinder 3. The piston 4 is slidably fitted onto this guide shaft 17, and the piston 4 moves linearly forward and backward along the guide shaft 1γ. The shaft 19 of the fixed conical plate 1 is supported by a bearing 20 with its tip cylinder portion 18.
It is supported so that it can rotate freely.

A movable conical plate 2 is slidably fitted onto this support shaft 19, and together with the fixed conical plate 1 forms a driving side pulley v0.

21 is a fixed silver plate of the driven side pulley 2; 22 is a movable conical plate facing the fixed conical plate 21; it is fitted to the support shaft 23 of the fixed conical plate 21 so as to be freely slidable; The driven side pulley (2) is activated, and the movable conical plate 22 is constantly pressed against the fixed conical plate (21) by the pressing spring (24).

25 is a variable speed V-belt. Thus, the movement of the movable conical plate 2 toward and away from the fixed conical plate 1 is controlled by the opening/closing operation of the check valve 12 provided in the communication passage 9 connecting the oil chamber 7 and the oil tank 8, and the compressed air flowing into the air chamber 15 of the air cylinder 3. The gear shifting operation can be performed effectively by performing the supply/disconnection operation.

In other words, when rotating the driven side pulley 2 at high speed, the air port 1 to the air chamber 15 of the air cylinder 3
When compressed air is introduced from 6, the piston 4 moves to the left and moves the movable conical plate 2 toward the fixed conical plate 1 to approach it.

Therefore, the diameter of the contact surface of the speed change V-belt 25 with the driving side pulley 2 becomes larger, and the driven side pulley 2 presses the movable conical plate 22 against the fixed conical plate 21 via the speed change belt 25 and presses the spring 24. Resisting and separating and shifting V belt 25
Driven side ② Reduce the diameter of the contact surface with pulley V2 to transmit high-speed rotation.

At this time, the oil in the oil tank 8 is sucked into the oil chamber 7 via the communication path 9 by the suction force caused by the leftward movement of the piston 4.

Therefore, when the supply of compressed air to the air chamber 15 is stopped,
Since the movable conical plate 2 is slightly compressed and moved in the opposite direction to the fixed conical plate 1 by the pressing force due to the tension of the variable speed V-belt 25, internal pressure is generated in the oil chamber 7, and the check valve 9 is automatically closed. The movable conical plate 2 is held in this position by hydraulic pressure within the movable conical plate 7 (see FIG. 1).

Next, when rotating the driven side pulley 2 at low speed,
At the same time as removing the compressed air from the air chamber 15, the air port 14
When compressed air is introduced into the pilot piston 13 and the check valve 12 is pressed and opened, the drive side
The movable conical plate 2 is free to move to the right, and the pressing force from the pressing spring 24 of the driven side ■Pulley ■2 moves the driven side ■Pulley ■2.
Shifting due to the movable conical plate 22 approaching the fixed conical plate 21 - Due to the fluctuation of the contact surface of the pulley 25, it is separated from the fixed conical plate 1 and moves to the right, so the diameter of the contact surface of the variable speed V-belt 25 becomes smaller. The oil in the oil chamber 7 is forced to flow into the oil tank 8 through the communication path 9 by the piston 4.

Thus, the diameter of the contact surface of the variable speed V-belt 25 with respect to the driven pulley is increased to transmit low-speed rotation.

Therefore, when the introduction of compressed air to the air port 14 is stopped, the check valve 12 automatically closes, and the movable conical plate 2 is held at this position by the hydraulic pressure in the oil chamber I (see FIG. 2).

As explained above, this device enables effective continuously variable speed operation because the position of the movable conical plate on the driving side or the driven side of the pulley can be arbitrarily selected and stopped, that is, the position of the moving conical plate relative to the fixed conical plate of the pulley In addition, even if the piston travels a large amount, the space of the cylinder does not increase, so it not only can be made smaller, but also has a high practical value, as it is inexpensive.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of this invention at high speed, and FIG. 2 is a sectional view at low speed. vo... Drive side ■Pulley, 1... Fixed conical plate, 2... Movable conical plate, 3... Air cylinder 4... Piston, 7...
... Oil chamber, 8 ... Oil tank, 9 ... Communication passage, 12 ... Check valve, 15 ... Air chamber, ■2 ... ...Driver side ■Pulley, 25...
・Variable speed V-belt.

Claims (1)

[Scope of utility model registration request] In a belt-type continuously variable transmission, the drive side - Pulley or driven side - The movable conical plate opposite to the fixed conical plate of the pulley is interlocked with the piston of the air cylinder, and the piston of the air cylinder is tightly inserted into the oil chamber, and A check valve is installed in the communication passage connecting the oil chamber and the oil tank, so that it can be opened at will by an appropriate means, and compressed air can be supplied to and cut off from the air chamber of the air cylinder by an appropriate means. A gear shift operation device for a continuously variable transmission, characterized in that: