JPH0771554A - Friction type continuously variable transmission - Google Patents

Abstract

PURPOSE:To prevent lubricating oil for a bearing for supporting an output shaft from leaking from a transmission case in a friction type continuously variable transmission adapted to change the speed of rotation of the input shaft and transmit the same to the output shaft by bringing a double cone contact with an input shaft and the output shaft. CONSTITUTION:A pocket 13 is provided between an output shaft 2 and a transmission case on the side of a bearing 9, and a disc-like slinger 14 projected over the surface of the output shaft 2 is disposed in the interior of the pocket 13. When lubricating oil which has flowed into the pocket 13 comes into contact with the rotating slinger 14, it is blown off in the circumferential direction of the pocket 13 by the centrifugal force to be discharged from an outlet path 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction type continuously variable transmission for continuously changing the speed of a drive shaft of a centrifugal blower, a centrifugal compressor, an impeller of a radial turbine or the like.

[0002]

2. Description of the Related Art A shaft for driving a high-speed rotating body such as an impeller of this type is continuously variable so that the output shaft on which the rotating body is mounted has a constant speed even if the rotational speed of the input shaft fluctuates. As a conventional technique of a friction type continuously variable transmission that shifts gears so that it can rotate, there is one proposed by Japanese Utility Model Laid-Open No. 3-55948.

This conventional transmission, as shown in FIG.
A plurality of double cones 3 that are movable in the axial direction are provided between the input shaft 1 and the output shaft 2 that are arranged to face each other, and the rotation of the input shaft 1 is transmitted to the output shaft 2 via the double cone 3 and the double cone 3 Is moved in the axial direction of the input shaft 1 to change the rotation of the output shaft 2.

In the above transmission, in order to smoothly rotate the output shaft 2 at a high speed, a transmission case 4 and a double cone 3 are provided.
The carrier guide 6 for guiding the carrier 5 is provided with oil supply passages 7 and 8, and the lubricating oil is supplied from the oil supply passages 7 and 8 to the bearing 9 supporting the output shaft 2.

In this case, the supplied lubricating oil enters from the upper rolling surface of the bearing 9, lubricates the inside of the bearing, and then is discharged to the outside from the outlet passage 10.

Further, a C-shaped seal ring 11 is attached in the gap between the surface of the output shaft 2 and the transmission case 4,
The seal ring 11 prevents the lubricating oil from leaking from the gap.

[0007]

However, since the above-mentioned seal ring 11 is for compressing and deforming the ring, the seal ring 11 is pressed against the surfaces of the output shaft 2 and the transmission case 4 to close the gap. If the pressure of the lubricating oil acting on the seal ring 11 increases due to an increase in the amount or the rotation of the output shaft speeds up, the ring 11 may be deformed and the sealing performance may become insufficient.

As described above, when the lubricating oil supplied to the rolling surface of the bearing 9 exceeds the sealing force of the seal ring 11, the lubricating oil is transmitted through the gap between the output shaft 2 and the transmission case 4 and the transmission case is transmitted. 4 leaks to the outside and runs for a long time, there are drawbacks such as running out of lubricating oil and obstructing the surrounding environment.

Therefore, an object of the present invention is to solve the above problems and to provide a friction type continuously variable transmission capable of preventing the leakage of lubricating oil from the bearing even when the output shaft rotates at a high speed.

[0010]

In order to solve the above-mentioned problems, the present invention provides unevenness on the output shaft in the vicinity of the bearing, and the unevenness causes rotation of the output shaft and the transmission case from the clearance. I decided to stop the outflow of lubricating oil.

[0011]

1 and 2 show a friction type continuously variable transmission according to an embodiment. Since the basic structure and operation of this transmission are the same as those of the conventional structure shown in FIG. 5, the same parts are designated by the same reference numerals and the description thereof will be omitted. explain.

As shown in the figure, the bearing 9 mounted on the outer circumference of the output shaft 2 is press-fitted into the inner diameter surface 12 of the carrier guide 6, and the carrier guide 6 is fixedly mounted on the end surface of the transmission case 4. To be done.

On the side of the bearing 9, an annular pocket 1 continuous in the circumferential direction between the output shaft 2 and the transmission case 4.
3 is formed, and inside the pocket 13, a disk-shaped slinger 14 that protrudes in the radial direction from the surface of the output shaft 2 is provided.

A ring groove 15 is provided on the surface of the output shaft 2 behind the pocket 13, and the ring groove 15 is provided.
A seal ring 11 that closes a gap 16 between the output shaft 2 and the transmission case 4 is attached to the.

Further, at the lower part of the transmission case 4, a lubricating oil outlet passage 17 communicating with the pocket 13 and the gap 16 is formed.

In the transmission of the embodiment having the above structure, the lubricating oil is supplied from the oil supply passage 8 to the inside of the bearing 9, and the lubricating oil passes through the pocket 13 and the clearance between the output shaft 2 and the transmission case 4. When attempting to get out of the pocket 16, the pocket 13 comes into contact with the rotating slinger 14 and is blown off in the circumferential direction of the pocket 13 by the centrifugal force generated by the high-speed rotation of the output shaft 2. This blown lubricant is
It will be discharged from the outlet passage 17 communicating with the pocket 13 and the outlet passage 10 of the carrier guide 6.
Leakage from 6 is prevented.

The lubricating oil discharged from the outlet passages 10 and 17 is collected in a lubricating tank attached to the transmission, which is not shown, and is passed through the circulation circuit by the action of the pump to the lubricating passages 7 and 8 again. Will be returned.

FIG. 3 shows another embodiment. In this example, a thread 18 is provided on the surface of the output shaft 2 which faces the clearance 16, and when the twist direction of this thread 18 is moved along the thread 18 in the rotational direction of the output shaft 2, it faces the bearing 9. Is set to proceed.

In this structure, when the output shaft rotates, the twist of the screw thread 18 acts as a pump for feeding the substance toward the bearing 9, and forms a screw pump with the transmission case 4. Therefore, the lubricating oil that adheres to the surface of the output shaft 2 and tries to escape to the outside is pushed back toward the bearing 9 by the above-mentioned pump action, and leakage is prevented.

On the other hand, the embodiment shown in FIG. 4 is an example in which the slinger 14 and the screw thread 18 described above are both provided on the surface of the output shaft 2, and the sealing effect is increased by combining the two in this way. You can

In each of the above embodiments, the surface of the output shaft 2 is provided with the slinger 14 and the screw thread 18 to form the unevenness for stopping the flow of the lubricating oil, but this unevenness can prevent the leakage of the lubricating oil. Any shape may be used, and a linear inclined groove or a multi-row concavo-convex shape may be used.

[0022]

As described above, according to the present invention, the surface of the output shaft is provided with irregularities so that when the output shaft rotates, a force for stopping the escape of the lubricating oil is generated. There is an effect that it is possible to reliably prevent the leakage of the vehicle and to maintain a stable operation of the transmission.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment.

FIG. 2 is a cross-sectional view showing an enlarged main part of the above.

FIG. 3 is a sectional view showing another embodiment.

FIG. 4 is a sectional view showing another embodiment.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Input Shaft 2 Output Shaft 3 Double Cone 4 Transmission Case 6 Carrier Guide 7, 8 Oil Supply Passage 9 Bearing 10, 17 Outlet Passage 11 Seal Ring 13 Pocket 14 Slinger 16 Clearance 18 Thread

Claims (3)

[Claims] 1. A double cone is provided between an input shaft and an output shaft to contact both shafts and transmit the rotation of the input shaft to the output shaft, and a bearing for supporting the output shaft in a transmission case is lubricated with oil. In a friction type continuously variable transmission that shifts the rotation of the output shaft by moving the double cone in the axial direction of the input shaft, the output shaft near the bearing is provided with irregularities. The friction type continuously variable transmission characterized in that the rotation of the lubricating oil is stopped by rotating the output shaft and the transmission case. 2. The friction type continuously variable transmission according to claim 1, wherein the unevenness is a disk-shaped member protruding in a radial direction in a gap between the output shaft and the transmission case. 3. The friction type continuously variable transmission according to claim 1, wherein the unevenness is a thread formed on the surface of the output shaft.