JP4479179B2 - Planetary roller type power transmission device - Google Patents

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. 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.

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 pressure-bonded state, and a carrier shaft is provided for equally dividing and supporting the planetary roller. or transmitted to the sun roller shaft by the revolution rotation of the planetary rollers, in the planetary roller type power transmission device for transmitting to said carrier shaft a driving force of the sun roller shaft by the revolution rotation of the planetary rollers, the axis of said planetary roller A ring-shaped oil sump having side plates provided on both sides of the fixed ring so as to control the movement in the direction, and having an opening opening on an end surface of the planetary roller on a side plate opposite to the carrier shaft The ring-shaped oil sump has a ring shape coaxial with the carrier shaft, and an inner diameter side end is located inside an inner peripheral surface of the fixed ring, and an outer diameter side end is the fixed ring. End of The fixed-ring-side oil reservoir that is in contact with the fixed-wheel and the outer-diameter-side end are in a plane that includes the end surface on the opposite side of the fixed wheel and on the inner side of the inner peripheral surface of the fixed ring. An oil reservoir on the sun roller side, and the side plate and an end surface of the planetary roller are in contact with each other between the fixed wheel side and the ring-shaped oil reservoir on the sun roller side. The above-mentioned problems were solved by providing a planetary roller type power transmission device. 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.

  In addition, the ring-shaped oil reservoir on the fixed ring side is a ring shape coaxial with the carrier shaft, and an inner diameter side end is located inside an inner peripheral surface of the fixed ring, and an outer diameter side end is the fixed ring. Therefore, the contact area between the planetary roller and the side plate can be reduced, and a part or most of the oil reservoir opening can be closed with a 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.

  Further, the ring-shaped oil reservoir on the sun roller side 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 opposite to the fixed wheel. It is in a plane including the end surface on the carrier shaft side, and is disposed on the inner side of the inner peripheral surface of the fixed ring, and between the side plate and the ring-shaped oil reservoir on the fixed ring side and the sun roller side Since the end face of the planetary roller is in contact with the planetary roller, the side plate on the side opposite to the carrier can be enlarged, and a larger oil sump can be formed. In particular, when the side plate and the end surface of the planetary roller come into contact with each other between the ring-shaped oil reservoir on the fixed wheel side and the sun roller side, the planetary roller is less likely to skew and sufficient lubrication is performed.

Furthermore, in the invention according to claim 2, the planetary roller type power transmission in which the opening of the oil reservoir on the sun roller side according to claim 1 is gradually separated from the planetary roller from the outer diameter side toward the inner diameter side. Equipment. Thereby, the contact area with the planetary roller is small, and a large amount of lubricating oil can be secured.

According to a third aspect of the present invention, a planetary roller type motive power provided with a communication path in which one communicates with the oil reservoir on the fixed wheel side or the oil reservoir on the sun roller side and the other communicates with the outer periphery of the side plate. Since it is a transmission device, lubricating oil can be supplied from the outside. 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.

  Further, a planetary roller type power transmission device in which a lubrication ring formed from an oil-impregnated member is fitted to the oil reservoir is provided. 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.

In addition, the inner diameter side end of the oil reservoir on the fixed ring side is arranged inside the inner peripheral surface of the fixed ring, and the outer diameter side end is closed with the fixed ring, so that an appropriate amount of lubricating oil is secured while securing a large amount of lubricating oil. Can supply. Furthermore, processing is easy. In addition, the oil reservoir on the sun roller side is provided on the side plate opposite to the carrier shaft, the outer diameter side end is arranged inside the inner peripheral surface of the fixed ring, the side plate on the opposite carrier side is enlarged, and a larger oil reservoir Therefore, sufficient lubrication capacity can be secured even on one side. Furthermore, since the side plate and the end surface of the planetary roller are in contact with each other between the ring-shaped oil reservoir on the fixed wheel side and the planetary roller side, sufficient lubrication is performed, and further long life and high speed are achieved. Can be realized. In the invention according to claim 2, contact with the planetary roller is made such that the opening of the oil reservoir on the sun roller side according to claim 1 is 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.

In the invention according to claim 3, there is provided a communication passage in which one communicates with the oil reservoir on the fixed wheel side or the oil reservoir on the sun roller side , and the other communicates with the outer periphery of the side plate, and the supply of lubricating oil from outside is provided. As a result, the lubricant can be replenished, and the effect of further extending the life of the lubricant and extending the life of the entire apparatus can be expected. Furthermore, since a lubrication ring formed from an oil-impregnated member can be fitted into the oil reservoir, and the outflow of solid lubricant such as grease can be prevented, the effect of being able to maintain a good lubrication state for a longer time is obtained. It was.

  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 portion opens in the end surface of the fixed ring, and the opening portion opens 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 3 is formed in the ring-shaped oil sump according to claim 1 in which a part of the opening portion opens at the end face of the fixed ring. The same parts as those in FIG. 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 such a 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 outside 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 3 is formed in the ring-shaped oil reservoir according to claim 1 and 2, 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 FIG. 1 and FIG. 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 side opposite to 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 2b and 2c 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 has increased 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.

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
End face of 3b, 3c planetary roller
4 Carrier axis
5 Side plate (on the opposite carrier shaft side)
6 Side plate
7 (Roll-shaped) oil reservoir on the sun roller side
7a opening
7c Outer diameter side end
8 and 9 (ring-shaped) oil reservoir on the fixed ring side
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 (3)

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 pressure-bonded state, and a carrier shaft is provided for equally dividing and supporting the planetary roller. or transmitted to the sun roller shaft by the revolution rotation of the planetary rollers, in the planetary roller type power transmission device for transmitting to said carrier shaft a driving force of the sun roller shaft by the revolution rotation of the planetary rollers, the axis of said planetary roller A ring-shaped oil sump having side plates provided on both sides of the fixed ring so as to control the movement in the direction, and having an opening opening on an end surface of the planetary roller on a side plate opposite to the carrier shaft The ring-shaped oil sump has a ring shape coaxial with the carrier shaft, and an inner diameter side end is located inside an inner peripheral surface of the fixed ring, and an outer diameter side end is the fixed ring. End of The fixed-ring-side oil reservoir that is in contact with the fixed-wheel and the outer-diameter-side end are in a plane that includes the end surface on the opposite side of the fixed wheel and on the inner side of the inner peripheral surface of the fixed ring. An oil reservoir on the sun roller side, and the side plate and the end surface of the planetary roller are in contact with each other between the fixed wheel side and the ring-shaped oil reservoir on the sun roller side. A planetary roller type power transmission device. The planetary roller type power transmission device according to claim 1, wherein an opening of the oil reservoir on the sun roller side according to claim 1 is gradually separated from the planetary roller from the outer diameter side toward the inner diameter side. 3. The communication path according to claim 1, wherein one is connected to the oil reservoir on the fixed wheel side or the oil reservoir on the sun roller side , and the other is connected to the outer periphery of the side plate. The planetary roller type power transmission device according to 1.

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