JP2005024078A - Planetary roller type power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive planetary roller type power transmission device, achieving favorable lubrication and good for high-speed rotation. <P>SOLUTION: In this planetary roller type power transmission device 23, two or more planetary rollers 3' are interposed in pressure contact state between the outer peripheral surface 1a of a sun roller shaft 1 and the inner peripheral surface 2a of a fixed ring 2, and a carrier shaft 4 is provided to equally divide the planetary rollers and support the same. The side plates 5, 6 regulating the axial movement of the planetary rollers are provided with ring-like oil reservoirs 7, 8, 9 having opening parts 7a, 8a, 9a opened to the end faces 3a, 3b of the planetary rollers. The ring-like oil reservoirs 8, 9 are disposed so that the inside diameter side ends 7b, 9b are located inside the inner peripheral surface of the fixed ring, and the outside diameter side ends 8c, 8d are abutted on the end face of the fixed ring. The ring-like oil reservoir 7 is disposed inside the inner peripheral surface of the fixed ring, and the opening part 7a is gradually isolated from the planetary rollers as it goes from the outside diameter side toward the inside diameter side. Further, the device is provided with communicating passages 11, 12, 13 communicating the oil reservoirs with the outside of the side plate. Further, a lubrication ring formed of an oil impregnation member is fitted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lubrication structure for a planetary roller power transmission device.

  Conventionally, a planetary roller type power transmission device has a carrier shaft that supports a plurality of planetary rollers in an equally divided state by interposing a plurality of planetary rollers in a pressure contact state between an outer peripheral surface of a sun roller shaft and an inner peripheral surface of a fixed ring. The driving force of the carrier shaft is transmitted to the sun roller shaft by revolving rotation of the planetary roller, or the driving force of the sun roller shaft is transmitted to the carrier shaft by revolving rotation of the planetary roller. Thus, the speed is reduced or increased. Since the roller is rotated in a pressure contact state, the roller needs to be lubricated, and an oil reservoir is provided and lubricated. As an example in which such an oil reservoir is provided between the rollers, in Patent Document 1, the oil reservoir is provided on a part of the inner peripheral side (orbital ring) of the fixed ring on which the planetary roller rotates. In addition, an inclined guide for promoting oil supply is provided. Moreover, in patent document 2, the oil-impregnated lubricating ring is provided in the inner peripheral side of the fixed ring of a planetary roller type power transmission device, or the sun roller shaft outer periphery. In addition, the thing of patent document 2 is provided with the side plate for controlling the axial movement of a planetary roller.

On the other hand, as an example in which an oil reservoir is provided not between the rollers but between the carrier shaft and the rollers, in Patent Document 3, an oil retaining member is interposed between the outer periphery of the sun roller shaft and the inner periphery of the carrier. Further, as in Patent Document 4, an oil reservoir is provided on the pocket surface of the carrier, and in Patent Document 5, a tunnel-shaped oil reservoir is provided between the pockets of the carrier.
Noto-2592969 Japanese Patent Laid-Open No. 10-196750 Japanese Patent Laid-Open No. 10-030699 JP 09-177917 A Japanese Patent Laid-Open No. 2001-050359

  However, in Patent Document 1 or 2, since the oil pool is provided in a part of the sun roller shaft or the fixed ring, the volume of the oil pool is limited, and as a result, the capacity of the lubricant to be filled is also limited. Therefore, there is a problem that the wear and tear of the lubricant is accelerated. On the other hand, when the volume of the oil reservoir is increased, there is a problem that the strength of the sun roller shaft and the fixed ring decreases. Furthermore, due to the vibration when the planetary roller type power transmission device rotates at high speed, the filled lubricant falls off in a solid state, and the lifetime of the lubricant is further shortened and seized. There has also been a problem of shortening the rolling fatigue life of the sun roller shaft, the raceway surface of the fixed ring, and the rolling surface of the planetary roller.

  On the other hand, even if the strength of the sun roller shaft and the fixed ring is secured by providing an oil reservoir on the carrier side, in Patent Document 4, since the oil reservoir is provided on the carrier shaft pocket surface, There is a problem that the volume is limited and the life of the lubricant is shortened. Also, in Patent Document 3, the oil-impregnated material is burned out due to missing scattering or breakage due to vibration when the power transmission device rotates at a high speed as described above, or the planetary roller steps on the scattered matter to shorten the rolling fatigue life. The problem remains. In Patent Document 5, the volume of the oil sump is increased to increase the capacity of the lubricant. However, since the shape of the carrier is complicated, there is a problem that the processing cost is increased.

  An object of the present invention is to provide a planetary roller power transmission device that has a long life in view of the above-described problems, can withstand high-speed rotation, and is inexpensive.

  In the present invention, a plurality of planetary rollers are interposed between the outer peripheral surface of the sun roller shaft and the inner peripheral surface of the fixed ring in a press-contact state, and the carrier shaft is provided so as to divide and support the planetary roller. In the planetary roller power transmission device that transmits the driving force of the shaft to the sun roller shaft by the revolution rotation of the planetary roller, or transmits the driving force of the sun roller shaft to the carrier shaft by the rotation rotation of the planetary roller. A ring-shaped oil having side plates provided on both sides of the fixed ring so as to restrict the axial movement of the planetary roller, and having an opening opening on an end surface of the planetary roller in at least one of the side plates. The above-described problems have been solved by providing a planetary roller power transmission device provided with a pool. That is, in the present invention, a large oil sump is secured on the side plate that is easy to process by effectively using the side plate for restricting the axial movement of the planetary roller.

  According to a second aspect of the present invention, the ring-shaped oil reservoir is a ring shape coaxial with the carrier shaft, and an inner diameter side end is located on an inner side than an inner peripheral surface of the fixed ring, and an outer diameter The planetary roller type power transmission device whose side end is in contact with the end face of the fixed ring is used. As a result, the contact area between the planetary roller and the side plate can be reduced, and a part or most of the opening of the oil sump can be closed with the fixed ring. The oil reservoir may be on one side of the side plate, but more preferably on both sides. Although it is possible to supply lubricating oil even if the center axis of the ring-shaped oil reservoir does not coincide with the carrier axis, it should be coaxial for stable holding, supplying, simple design, etc. Is preferred.

  On the other hand, the ring-shaped oil sump is a ring shape coaxial with the carrier shaft, provided on a side plate opposite to the carrier shaft, and an outer diameter side end is an end surface on the side opposite to the carrier shaft of the fixed ring. And a planetary roller type power transmission device disposed inside the inner peripheral surface of the fixed ring. Thereby, the side plate on the side opposite to the carrier can be enlarged, and a larger oil sump can be configured. In addition, you may adjoin with the oil sump of Claim 2. Further, the coaxial is the same as described above.

  Further, the invention according to claim 4 is the planetary roller type power transmission device in which the opening of the ring-shaped oil sump according to claim 3 is gradually separated from the planetary roller from the outer diameter side toward the inner diameter side. Thereby, the contact area with the planetary roller is small, and a large amount of lubricating oil can be secured.

  In the invention according to claim 5, since the planetary roller type power transmission device is provided with a communication path in which one communicates with the oil reservoir and the other communicates with the outside of the side plate, Can supply. The communication path may be a groove or a through hole. Further, a grease nipple, a grease reservoir, or the like may be provided outside the other side. Furthermore, the communication path may be communicated with the outside through a fixed ring.

  According to a sixth aspect of the present invention, a planetary roller type power transmission device is provided in which a lubricating ring formed of an oil retaining member is fitted in the oil reservoir. Thereby, the outflow of solid lubricants such as grease can be prevented. The planetary roller has a solid or hollow shape. The hollow case is advantageous for high-speed rotation.

  As described above, in the present invention, an oil sump having a volume larger than that of the prior art is provided, and this oil sump is provided not on the sun roller shaft or the fixed ring but on the side plate, and further on the oil sump. Since the filled lubricant has less chance of direct contact with the track of the sun roller shaft and the rolling surface of the planetary roller, the life of the lubricant is longer than in the prior art, the strength of the sun roller shaft and the fixed ring is increased, and It can withstand high-speed rotation, and the rolling fatigue life of the sun roller, the fixed wheel, and the planetary roller is increased, and the reliability of the power transmission device is improved. In addition, an inexpensive planetary roller type power transmission device that can withstand high-speed rotation and is easy to process has been provided. Further, even if there is contact between the side plate and the end surface of the planetary roller due to the axial restriction of the planetary roller, sufficient lubrication is performed, so that a longer life and higher speed can be achieved.

  In the invention of claim 2, the inner diameter side end of the ring-shaped oil sump is arranged on the inner side of the inner peripheral surface of the fixed ring, and the outer diameter side end is closed with the fixed ring. While ensuring, an appropriate amount of lubricating oil can be supplied. Furthermore, processing is easy. In the invention according to claim 3, a ring-shaped oil sump is provided on the side plate opposite to the carrier shaft, the outer diameter side end is disposed on the inner side of the inner peripheral surface of the fixed ring, and the anti-carrier side Since the side plate can be enlarged and a larger oil sump can be constructed, a sufficient lubricating capacity can be secured even on one side. Furthermore, in the invention described in claim 4, the ring-shaped oil sump opening according to claim 3 is in contact with the planetary roller so as to be gradually separated from the planetary roller from the outer diameter side toward the inner diameter side. Since the area is small and a large amount of lubricating oil is secured, it is possible to provide a long life and to supply an appropriate amount of lubricant.

  Further, in the invention according to claim 5, since a communication passage is provided, one of which communicates with the oil reservoir and the other communicates with the outside, and the lubricating oil can be supplied from the outside, it is possible to replenish the lubricant, The effect of further extending the life of the agent and extending the life of the entire apparatus can be expected. Furthermore, in the invention according to claim 6, since a lubrication ring formed from an oil-impregnated member is fitted into the oil reservoir, and the outflow of solid lubricant such as grease can be prevented, a good lubrication state can be maintained for a longer time. It was possible to produce effects such as being able to.

  An example of an embodiment of the present invention will be described with reference to the drawings. 1A and 1B show a first embodiment of a planetary roller power transmission device according to the present invention. FIG. 1A is a partial transverse sectional view, and FIG. 1B is a partial longitudinal sectional view. In the first embodiment, a part of the opening is opened in the end surface of the fixed ring, and the opening is opened inward from the inner peripheral surface of the fixed ring. An oil sump is provided. In FIG. 1, a plurality of (for example, three) planetary rollers 3 are interposed between the outer peripheral surface 1a of the sun roller shaft 1 and the inner peripheral surface 2a of the fixed ring 2 in a pressure contact state, and the planetary rollers are equally divided and supported. Carrier shaft 4 and side plates 5 and 6 on both sides of the fixed wheel 2 for restricting the axial movement of the planetary roller 3. The driving force of the carrier shaft 4 is applied to the sun roller shaft 1 by the rotation and revolution of the planetary roller 3. The driving force of the sun roller shaft 1 is transmitted to the carrier shaft 4 by the rotation and revolution of the planetary roller 3. Both side plates 5, 6 have planetary roller 3 side surfaces 5 a, 6 a having inner diameter side ends 8 b, 9 b disposed inside the inner peripheral surface 2 a of the fixed ring 2, and outer diameter side ends 8 c, 9 c of the fixed ring 2. Ring-shaped oil reservoirs 8 and 9 are provided (shown by mesh lines) that are closed by the end faces 2b and 2c. The inner diameter side ends 8b and 9b of the oil reservoirs 8 and 9 are set to be inside the inner peripheral surface 2a of the fixed ring 2, and the openings 8a and 9a are partially opened on the end surfaces 3b and 3c of the planetary roller 3. Therefore, oil is appropriately supplied to the sun roller shaft 1 and the planetary roller 3 and contributes to lubrication thereof. In addition, since part of the openings 8a and 9a of the oil reservoirs 8 and 9 are blocked by the end faces 2b and 2c of the fixed ring 2, the lubricating oil can be prevented from flowing out and falling, and a certain amount of lubricating oil can be secured. In addition, a ring-shaped oil sump 7 having an outer diameter side end 7 c on the inner side of the inner peripheral surface 2 a of the fixed ring 2 is provided on the planetary roller 3 side surface 5 a of the side plate 5 opposite to the carrier shaft 4. This contributes to the lubrication of the sun roller shaft 1 and the planetary roller 3. Further, since the opening 7a of the ring-shaped oil reservoir 7 is provided so as to be gradually separated from the planetary roller from the outer diameter side toward the inner diameter side, the contact area with the planetary roller is small, and an appropriate amount of lubricant is provided. Supplied. In the figure, the opening 7a has a conical shape with a straight section, but may have an arc shape or a cylindrical shape.

  According to such a configuration, the volume of the oil sump 7, 8, 9 can be made larger than that of the prior art, and the lubricant does not fall off or scatter in a solid state, so the life of the lubricant is prolonged and high speed rotation is achieved. Will endure. Further, since the sun roller shaft and the fixed ring are not provided with a groove as in the prior art, their strength is increased and the reliability is increased.

  Next, a second embodiment of the present invention will be described. 2A and 2B show a second embodiment of the planetary roller power transmission device of the present invention. FIG. 2A is a partial cross-sectional view, and FIG. 2B is a partial vertical cross-sectional view. In the second embodiment, the communication passage according to claim 5 is formed in the ring-shaped oil sump according to claim 2 in which a part of the opening portion opens at the end face of the fixed ring. Parts similar to those in FIG. 1 are denoted by the same reference numerals and a part of the description is omitted. In FIG. 2, there are provided grooves 11 that lead from oil sumps 8 and 9 indicated by the mesh lines of both side plates 5 and 6 to the outer peripheries of the side plates 5 and 6. According to this configuration, the lubricant in the ring-shaped oil reservoirs 8 and 9 provided on the side plates 5 and 6 is consumed, and even if the lubricant is deteriorated, a new lubricant can be supplied from the outside of the power transmission device. Life is further extended.

  A third embodiment of the present invention will be described. 3A and 3B show a third embodiment of the planetary roller power transmission device of the present invention, in which FIG. 3A is a partial transverse sectional view, and FIG. 3B is a partial longitudinal sectional view. In the third embodiment, the communication passage according to claim 5 is formed in the ring-shaped oil sump according to claim 3 and 4, wherein the opening portion opens inward from the inner peripheral surface of the fixed ring. . Furthermore, the fixed ring is provided with an oil sump communication path that opens at both end faces of the fixed ring shown in the second embodiment. Parts similar to those in FIGS. 1 and 2 are given the same reference numerals, and a part of the description is omitted. In FIG. 3, a through hole 12 is provided from an oil reservoir 7 provided on the planetary roller 3 side surface 5 a of the side plate 5 on the opposite side of the carrier shaft 4 to the outer periphery 5 b of the side plate 5. Even in such a configuration, since the new lubricant can be replenished from outside the power transmission device as described above, the life of the lubricant is further increased. Further, oil reservoirs 8 and 9 indicated by mesh lines opened on both end faces 2 b and 2 c of the fixed ring 2 are provided, and a communication hole 13 for connecting the oil reservoir and the outside of the side plates 5 and 6 is formed in the fixed ring 2. The communication hole communicates the openings 8a and 9a with the outer peripheral side 2d of the fixed ring. With such a structure, the lubricating oil injection port can be provided in the fixed ring 2 wider than the side plates 5 and 6, so that a grease nipple or the like can be easily connected. In FIG. 3, the planetary roller 3 ′ has a hollow shape, and the mass of the planetary roller 3 ′ is small. Therefore, the centrifugal force due to revolution is reduced, and the stress of the sun roller shaft and the fixed ring is reduced. It can withstand rotation and increases reliability in strength.

BRIEF DESCRIPTION OF THE DRAWINGS (a) which shows 1st embodiment of the planetary roller type power transmission device of this invention is a partial cross-sectional view, (b) is a partial longitudinal cross-sectional view. (A) which shows 2nd embodiment of the planetary roller type power transmission device of this invention is a partial cross-sectional view, (b) is a partial longitudinal cross-sectional view. (A) which shows 3rd embodiment of the planetary roller type power transmission device of this invention is a partial cross-sectional view, (b) is a partial longitudinal cross-sectional view.

Explanation of symbols

1 Sun roller shaft
1a Sun roller outer peripheral surface
2 fixed wheel
2a Inner peripheral surface of fixed ring
2b, 2c End face of fixed ring
3, 3 'planetary roller
3a, 3b End face of planetary roller
4 Carrier axis
5 Side plate (on the opposite carrier shaft side)
6 Side plate
7 Ring-shaped oil sump (opening opens inward from the inner peripheral surface of the fixed ring)
7a opening
7c Outer diameter side end
8, 9 Ring-shaped oil sump (a part of the opening opens to the end face of the fixed ring)
8a, 9a opening
8b, 9b Inner diameter side end
8c, 9c Outer diameter side end
11, 12, 13 passage
21, 22, 23 Planetary roller type power transmission device

Claims (6)

A plurality of planetary rollers are interposed in pressure contact between the outer peripheral surface of the sun roller shaft and the inner peripheral surface of the fixed ring, and a carrier shaft that divides and supports the planetary roller is provided. In the planetary roller type power transmission device that transmits the driving force of the sun roller shaft to the carrier shaft by the revolution rotation of the planetary roller, the planetary roller shaft A ring-shaped oil sump having a side plate provided on both sides of the fixed ring so as to control a movement in a direction, and having an opening opening at an end surface of the planetary roller on at least one of the side plates; A planetary roller type power transmission device. The ring-shaped oil reservoir has a ring shape coaxial with the carrier shaft, and has an inner diameter side end that is located on the inner side of the inner peripheral surface of the fixed ring and an outer diameter side end that is in contact with the end surface of the fixed ring. The planetary roller type power transmission device according to claim 1. The ring-shaped oil reservoir has a ring shape coaxial with the carrier shaft, and is provided on a side plate opposite to the carrier shaft, and an outer diameter side end includes an anti-carrier shaft side end surface of the fixed ring. 2. The planetary roller power transmission device according to claim 1, wherein the planetary roller power transmission device is disposed in a plane and inside the inner peripheral surface of the fixed ring. 4. A planetary roller power transmission device, wherein the opening of the ring-shaped oil reservoir according to claim 3 is gradually separated from the planetary roller from the outer diameter side toward the inner diameter side. 5. The planetary roller power transmission device according to claim 1, further comprising a communication path in which one communicates with the oil reservoir and the other communicates with the outside of the side plate. The planetary roller power transmission device according to any one of claims 1 to 5, wherein a lubricating ring formed of an oil-impregnated member is fitted into the oil reservoir.

Images