JP2007239885A - Thrust support mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thrust support mechanism reducing wear of race rings. <P>SOLUTION: The thrust support mechanism is provided with the first race ring 12a fixed to a first member, an intermediate ring 13 arranged between the first race ring 12a and a second race ring, a plurality of first rollers 14a arranged between the first race ring 12a and the intermediate ring 13, and a first retainer 15a having a plurality of pockets 21a for retaining the first rollers 14a such that rolling axes are in parallel with each other. Axially recessed oil receivers 22a are provided on width faces 25a, 25b of the first retainer 15a, and the first retainer 15a is used as a race ring guide. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a thrust receiving mechanism, and more particularly to a thrust receiving mechanism used in a scroll compressor or the like.

  A thrust receiving mechanism used in a scroll compressor or the like that receives a thrust load needs to receive a thrust load due to an eccentric rotational motion, and therefore a ball bearing has been used.

  However, since the ball bearing has a structure that receives a load by point contact, it is not suitable for receiving a high load. Here, a thrust receiving mechanism that receives a thrust load by a roller bearing that receives a load in line contact is disclosed in Japanese Patent Application Laid-Open No. 2000-186680 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2002-242857 (Patent Document 2). Yes.

According to Patent Document 1 and Patent Document 2, the rolling shaft centers of the roller bearings are arranged in two rows in the vertical direction while changing their directions in directions perpendicular to each other to receive a thrust load due to eccentric rotational motion. FIG. 9 is an exploded perspective view showing the basic structure of the thrust receiving mechanism in this case. FIG. 10 is a cross-sectional view showing a part of the thrust receiving mechanism in this case. Referring to FIGS. 9 and 10, thrust receiving mechanism 101 includes two race rings 102a and 102b and an intermediate ring 103 arranged between race rings 102a and 102b. A roller 104a is arranged between the raceway ring 102a and the intermediate ring 103, and is held by a cage 105a so as to have a rolling axis in the vertical direction (vertical direction on the paper surface) in FIG. Further, a roller 104b is disposed between the raceway ring 102b and the intermediate ring 103, and is held by a cage 105b so as to have a rolling axis in the lateral direction (left and right direction in the drawing) in FIG. That is, the rolling axes of the rollers 104a and 104b are arranged in directions perpendicular to each other. With this configuration, the thrust receiving mechanism 101 receives a thrust load due to an eccentric rotational motion. In addition, such a thrust receiving mechanism 101 can receive a high load because the rolling element is a roller. The above-described cages 105a and 105b include a box-shaped cage composed of two steel plates in addition to a resin cage composed of one member.
Japanese Unexamined Patent Publication No. 2000-186680 (paragraph numbers 0019 to 0021, FIG. 3) JP 2002-242857 A (paragraph number 0029, FIG. 5)

  As described above, the thrust receiving mechanism receives a thrust load due to the eccentric rotational motion by arranging two rows of rollers in a direction in which the rolling axis is vertical.

  Here, the cage that holds the roller moves in a direction perpendicular to the rolling axis of the roller by eccentric rotational movement. However, as shown in Patent Document 2, the cage guides the roller, that is, the rolling element. The guidance causes the following problems.

  FIG. 11 is a cross-sectional view showing a part of a cage provided in a conventional thrust receiving mechanism. Referring to FIG. 11, the thrust receiving mechanism includes a race ring 111, an intermediate ring 112, rollers 113, and a resin cage 114 that holds the rollers 113. The retainer 114 is provided with roller stoppers 116a and 116b on the intermediate wheel 112 side and the raceway ring 111 side in order to prevent the rollers 113 held in the pocket 115 from falling off.

  The cage 114 is a roller guide, and is guided in contact with a roller stopper 116a provided at the intermediate wheel 112 side.

  The retainer 114 is a rolling element guide, and when the roller diameter is small, the width of the retainer 114 must be reduced in order to establish the rolling element guide, and the warp of the retainer 114 increases. There is. As the warp of the cage 114 becomes large, the cage 114 and the raceway surface of the raceway ring 111 come into contact with each other, resulting in high torque as well as poor oil permeability. Furthermore, if the warp of the retainer 114 is large, the position of the claw of the retainer 114 and the variation in the dimension between the claws increase. Therefore, when the retainer 114 is swung during the eccentric rotational motion, the roller stopper portion of the retainer 114 116a and the like 113 may become unstable, and the roller stoppers 116a provided on the intermediate wheel 112 side may contact and be guided.

  In addition, when the thrust receiving mechanism receives a thrust load due to the eccentric rotational movement and the roller 113 rolls in the direction of the arrow X, the roller 113 starts from the roller stopper 116a with respect to the retainer 114. Load can be applied in the direction. If it does so, the rolling direction of the roller 113 shown by the arrow X and the load direction applied to the holder | retainer 114 shown by the arrow Y will not correspond, and the behavior of the holder | retainer 114 will become unstable. As a result, yawing or rolling of the rollers 113 occurs, or the races 111 and the intermediate rings 112 slip with the 113, and the wear of the races 111 and the intermediate rings 112 proceeds.

  Although the above-mentioned cage is a resin cage 114, the same applies to the case of a box-shaped cage composed of two steel plates. FIG. 12 is a cross-sectional view showing a part of the cage when the cage for holding the rollers is a box-shaped cage. Referring to FIG. 12, the box-shaped cage 117 is composed of an upper cage 118a arranged on the intermediate wheel 112 side and a lower cage 118b arranged on the track ring 111 side. The upper retainer 118a and the lower retainer 118b have their ends bent in a claw shape so as to oppose each other in the axial direction. The box-shaped cage 117 is configured by engaging claw-shaped portions (not shown) of the upper cage 118a and the lower cage 118b. The box-shaped cage 117 is a roller guide, and is guided in contact with the roller stoppers 120 and 113 of the upper cage 118a.

  Here, when the roller 113 held in the pocket 119 of the box-shaped cage 117 rolls in the direction of the arrow X, the direction from the roller 113 to the roller stopper 120 is the starting point of the roller 113 with respect to the upper cage 118a. Is loaded. Also in this case, the rolling direction of the roller 113 indicated by the arrow X and the load direction applied to the box-shaped cage 117 indicated by the arrow Z do not match, so the behavior of the box-shaped cage 117 is not stable. Then, similarly to the cage 114 shown in FIG. 11 described above, yaw or rolling of the rollers 113 occurs, or the races 111 and the intermediate rings 112 slip with the 113, and wear progresses.

  Further, when the box-shaped cage 117 is a roller guide, if the diameter of the roller 113 is reduced, the thickness dimension of the upper cage 118a and the lower cage 118b needs to be reduced, that is, the thickness of the steel plate needs to be reduced. Then, the upper cage 118a and the lower cage 118b are greatly warped, and the positions of the claws and the dimensions between the claws cannot be properly engaged, so that the box-shaped cage 117, the race ring 111, and the intermediate ring cannot be engaged. 112 may come into contact. As a result, the formation of a lubricating oil film between the raceway ring 111 and the like and the box-shaped cage 117 is hindered, and the wear of the roller 113, the raceway ring 111, and the intermediate ring 112 is promoted.

  As described above, in the case of a roller guide in both a resin cage made of one member and a box cage made of two steel plates, there is a risk of promoting the wear of the bearing ring. There is.

  An object of the present invention is to provide a thrust receiving mechanism that can reduce wear of a raceway ring.

  The thrust receiving mechanism according to the present invention supports the thrust load by being interposed between the first member and the second member that perform eccentric rotational motion between each other. The thrust receiving mechanism includes a first race ring fixed to the first member, a second race ring fixed to the second member, and the first race ring and the second race ring. A plurality of first rollers arranged between the arranged intermediate ring, the first raceway ring and the intermediate ring, and a plurality of rollers for holding the first roller so that their rolling axes are parallel to each other. A first cage having a pocket, a plurality of second rollers disposed between the second race ring and the intermediate ring, and the second rollers are held such that the rolling axes are parallel to each other. A second retainer having a plurality of pockets, the rolling axis of the first roller and the rolling axis of the second roller are orthogonal, and the first member to the first First guide pin that extends through the raceway ring and the first cage to the intermediate ring, and the second raceway and the second cage from the second member A second guide pin extending through to the intermediate wheel is provided, and the first guide pin is in a direction perpendicular to the rolling axis of the first roller and within the regulation range of the first cage and the intermediate wheel. And the second guide pin is movable in a direction perpendicular to the rolling axis of the second roller within the restriction range of the second cage and the intermediate wheel. Here, an oil sump recessed in the axial direction is provided on at least one width surface of the cage, and the cage serves as a raceway guide.

  Thus, by providing an oil sump on at least one width surface of the cage and using the cage as a raceway guide, the movement of the cage can be stabilized regardless of the movement of the rollers. If it does so, the roller yawing and rolling, and the slip between a roller and a bearing ring are suppressed, and wear of a bearing ring can be reduced. In this case, since the raceway and the cage are in contact with each other in a plane, the cage can be stably used as the raceway guide. Here, by using the bearing ring as the bearing ring guide, the distance between the bearing ring and the cage is narrowed, and the bearing ring and the cage may be adsorbed. However, since the lubricating oil held in the oil sump provided on the width surface of the cage is supplied, the lubricating oil can be stably supplied between the cage and the raceway. Adsorption to the ring can be prevented, and an oil film of lubricating oil can be appropriately formed between the cage and the raceway ring.

  Preferably, the depth dimension from the width surface of the oil sump is 20% or less of the axial dimension of the cage. By doing so, the lubricating oil stored in the oil reservoir can be appropriately supplied.

  More preferably, the axial dimension of the cage is 0.1 to 0.5 mm smaller than the radial dimension of the roller. By carrying out like this, the holder | retainer can be used as a bearing ring guide, maintaining the space | interval of a holder | retainer and a bearing ring appropriately.

  More preferably, the oil sump is provided on both sides of the cage. With this configuration, it is not necessary to consider the installation direction.

  More preferably, the oil sump may be in the form of hollows dispersed independently. By comprising in this way, the lubricating oil required for oil film formation can be supplied also in the location where the lubricating oil between a holder | retainer and a bearing ring is difficult to be supplied. Further, the oil sump may be a missing ball, a sphere, a rectangular parallelepiped, a rectangular parallelepiped, a regular hexagonal column, a cone, a truncated cone, a pyramid, a cylinder, a truncated pyramid, an obelisk, or an annular shape.

  More preferably, the oil sump has a continuous groove shape. Even if it is an oil reservoir of such a shape, lubricating oil can be supplied. Furthermore, the oil reservoir may be a groove formed concentrically with respect to the center of the cage, or may be a groove formed spirally.

  More preferably, the cage is a resin cage, an aluminum cage, a shaving cage or a press cage.

  More preferably, the rollers are provided with full or partial crowning including logarithmic crowning.

  According to this invention, by providing an oil sump on at least one width surface of the cage and using the cage as a raceway guide, the movement of the cage can be stabilized regardless of the movement of the rollers. If it does so, the roller yawing and rolling, and the slip between a roller and a bearing ring are suppressed, and wear of a bearing ring can be reduced. In this case, since the raceway and the cage are in contact with each other in a plane, the cage can be stably used as the raceway guide. Here, by using the bearing ring as the bearing ring guide, the distance between the bearing ring and the cage is narrowed, and the bearing ring and the cage may be adsorbed. However, the lubricating oil supplied from the oil reservoir provided on the width surface of the cage can supply the lubricating oil between the cage and the bearing ring, thereby preventing adsorption between the cage and the race ring. In addition, an oil film of lubricating oil can be appropriately formed between the cage and the raceway.

  As a result, it is possible to provide a thrust receiving mechanism in which the wear of the raceway ring is reduced.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an exploded perspective view showing a thrust receiving mechanism according to one embodiment of the present invention.

  Referring to FIG. 2, the thrust receiving mechanism 11 is interposed between a housing 20a as a first member and a rotating member 20b as a second member that performs an eccentric rotational movement with respect to the housing 20a. A thrust load generated between the housing 20a and the rotating member 20b is supported.

  The thrust receiving mechanism 11 is a flat annular member having a raceway surface on one side, a first race ring 12a having a surface opposite to the raceway surface attached to the housing 20a, and a flat annular member. A second race ring 12b having a raceway surface on one side and a surface opposite to the raceway surface attached to the rotating member 20b, and an intermediate ring 13 which is a flat plate-like annular member and has raceway surfaces on both sides thereof. Is provided. The first raceway ring 12a and the second raceway ring 12b are arranged so that the raceway surfaces face each other. The intermediate ring 13 includes a first raceway ring 12a and a second raceway ring 12b so that both raceway faces the raceway face of the first raceway ring 12a and the raceway face of the second raceway ring 12b. It is arranged between.

  The thrust receiving mechanism 11 is disposed between the first race ring 12a and the intermediate ring 13, and includes a plurality of first rollers 14a that contact the raceway surfaces of the first race ring 12a and the intermediate ring 13, and a second A plurality of second rollers 14b disposed between the raceway ring 12b and the intermediate ring 13 and in contact with the raceway surfaces of the second raceway ring 12b and the intermediate ring 13 are provided. The first roller 14a rolls on the raceway surface of the first raceway ring 12a and the raceway surface of the intermediate ring 13 that are arranged in the vertical direction. The second roller 14 b rolls on the raceway surface of the second race ring 12 b and the raceway surface of the intermediate ring 13 that are arranged in the vertical direction.

  The thrust receiving mechanism 11 is a flat annular member that holds a plurality of first rollers 14a, and a flat retainer 15a that holds a plurality of second rollers 14b. A second cage 15b. The plurality of first rollers 14a are held so as to be parallel to each other by the first cage 15a so that their rolling axes are aligned and directed in the direction of arrow A. Similarly, the second roller 14b is held so as to be parallel to each other by the second cage 15b so that its rolling axis is aligned and oriented in the direction of arrow B perpendicular to the direction of arrow A. ing. In order to prevent the first roller 14a held in the pocket 21a from falling off, the first cage 15a is provided with roller stoppers (not shown) on the intermediate wheel 13 side and the first track ring 12a side. ing. Similarly, with respect to the second cage 15b, in order to prevent the second roller 14b held in the pocket from falling off, roller stoppers (not shown) are provided on the intermediate wheel 13 side and the second race ring 12b side. Is provided.

  The first race 12a is provided with a pair of round holes 17a at positions facing each other at intervals of 180 degrees, and the intermediate ring 13 and the first cage 15a are opposed to each other at intervals of 180 degrees. In addition, a pair of long holes 18a and 19a are provided so that the longitudinal directions are aligned. The pair of long holes 18a and 19a extend in the radial direction, and allow their own movement in a direction orthogonal to the rolling axis direction (direction of arrow A) of the first roller 14a. 19a <18a.

  The thrust receiving mechanism 11 includes a pair of first guide pins 16a so as to extend from the housing 20a through the first track ring 12a and the first retainer 15a to the intermediate ring 13. By inserting the pair of first guide pins 16a through the round holes 17a and the long holes 18a and 19a, the circumferential direction of each member is positioned, and the first race 12a is fixed to the housing 20a. Further, the intermediate wheel 13 and the first cage 15a are within the allowable range of the long holes 18a and 19a, in the direction orthogonal to the rolling axis direction of the first roller 14a, that is, in the direction of the arrow B or vice versa. It can move in the direction.

  Similarly, the second track ring 12b is provided with a pair of round holes 17b at positions facing each other at intervals of 180 degrees, and the intermediate ring 13 and the second cage 15b are spaced at intervals of 180 degrees. A pair of long holes 18b and 19b are provided so as to face each other and align the longitudinal direction. Note that the pair of long holes 18a and 18b provided in the intermediate wheel 13 are provided at intervals of 90 degrees. The pair of long holes 18b and 19b extends in the radial direction, and allows their own movement in a direction perpendicular to the rolling axis direction (direction of arrow B) of the second roller 14b. 19b <18b.

  The thrust receiving mechanism 11 includes a pair of second guide pins 16b so as to extend from the rotating member 20b to the intermediate ring 13 through the second race ring 12b and the second cage 15b. By inserting the pair of second guide pins 16b through the round holes 17b and the long holes 18b and 19b, the circumferential direction of each member is positioned, and the second race ring 12b is fixed to the rotating member 20b. The intermediate wheel 13 and the second cage 15b are within the allowable range of the long holes 18b and 19b, in the direction orthogonal to the rolling axis direction of the second roller 14b, that is, in the direction of arrow A or the opposite direction. It is movable.

  With such a configuration, even when the rotating member 20b performs an eccentric rotational movement in a state where the housing 20a is fixed, the first retainer 15a, the second retainer 15b, and the intermediate wheel 13 are indicated by the arrows A and B. And the reverse movement of the first roller 14a and the second roller 14b rolls, so that the thrust receiving mechanism 11 has an eccentricity between the rotating member 20b and the housing 20a. Thrust load can be supported.

  Next, among the constituent members of the thrust receiving mechanism 11, the configuration of the first cage 15a will be described in detail. FIG. 3 is a view of the first cage 15a included in the thrust receiving mechanism 11 shown in FIG. 2 as seen from the axial direction. Moreover, FIG. 1 is sectional drawing which shows the principal part of the 1st holder | retainer 15a shown in FIG.

  With reference to FIGS. 1, 2 and 3, the first cage 15a is provided with a plurality of pockets 21a for holding the first rollers 14a. The plurality of first rollers 14a are held in the respective pockets 21a provided in the first cage 15a and roll on the raceway surface of the first raceway ring 12a and the raceway surface of the intermediate ring 13 arranged in the vertical direction. Move. Further, the first cage 15a is provided with roller stoppers 23a and 23b on the intermediate wheel 13 side and the first track ring 12a side in order to prevent the first roller 14a held in the pocket 21a from dropping off. ing.

  In the width surfaces 25a and 25b on both sides of the first cage 15a, a direction along the rolling axis of the first roller 14a and a direction perpendicular thereto, that is, a direction indicated by arrows A and B in FIG. An oil reservoir 22a recessed in the axial direction is provided. The oil reservoir 22a is provided in a plurality of continuous grooves. Lubricating oil supplied from the outside can be held by the oil reservoir 22a, or can be gradually supplied between the first cage 15a and the raceway ring 12a and the intermediate ring 13. The axial dimension of the first cage 15a is slightly smaller than the dimension between the first race ring 12a and the intermediate ring 13, that is, the radial dimension of the first roller 14a. Yes.

  By comprising in this way, the position of the axial direction of the 1st holder | retainer 15a can be stabilized by the 1st track ring 12a and the intermediate | middle wheel 13, and the 1st holder | retainer 15a is used as a track ring guide. be able to. Then, the behavior of the first cage 15a can be stabilized regardless of the movement of the first roller 14a held in each pocket 21a of the first cage 15a.

  Specifically, in a state where the thrust receiving mechanism 11 is stationary, the first retainer 15a is disposed at a substantially central portion of the first track ring 12a and the intermediate ring 13 positioned in the vertical direction. That is, the first roller 14a is not in contact with the roller stoppers 23a and 23b located on the first track ring 12a side and the intermediate wheel 13 side.

  When the thrust receiving mechanism 11 receives a thrust load due to the eccentric rotational motion, the first roller 14a rolls in the direction of arrow B in FIG. Then, the first roller 14a comes into contact with the center portion 24 of the pocket 21a between the roller stopper 23a and the stopper 23b in the first cage 15a, and the rolling direction, that is, the direction of the arrow B. Will be loaded. Therefore, the rolling direction of the first roller 14a indicated by the arrow B is the same as the load direction applied to the first cage 15a in the central portion 24, and the behavior of the first cage 15a is stabilized. It will be.

  In this case, since the first cage 15a, the first track ring 12a and the intermediate ring 13 are in contact with each other in a plane, the first cage 15a can be stably used as the track ring guide. . Here, by using the first cage 15a as a bearing ring guide, the distance between the first cage 15a, the first race 12a and the intermediate wheel 13 is narrowed, and the first cage 15a and the first cage 15a There is a risk that the one ring 12a and the like will be adsorbed. However, since the lubricating oil is supplied from the oil sump 22a provided on the width surfaces 25a and 25b on both sides of the first cage 15a, the first cage 15a, the first track ring 12a and the intermediate ring 13 are It does not adsorb. In addition, an oil film made of lubricating oil can be appropriately formed between the first cage 15a and the first track ring 12a and the intermediate ring 13. As a result, yawing and rolling of the first roller 14a and slippage between the first roller 14a and the first race ring 12a and the intermediate ring 13 are suppressed, and wear of the first race ring 12a and the intermediate ring 13 is reduced. Is done.

  Here, when the dimension in the axial direction of the first cage 15a is C and the dimension between the first race 12a and the intermediate ring 13, that is, the dimension in the radial direction of the roller is D, the dimension C is , 0.1 to 0.5 mm smaller than the dimension D. By carrying out like this, the 1st holder | retainer 15a can be used as a bearing ring guide, maintaining the space | interval of the 1st holder | retainer 15a, the 1st track ring 12a, and the intermediate ring 13 appropriately.

  Here, when the dimension in the depth direction of the oil reservoir 22a is E, the dimension E is set to be within 20% of the dimension C in the axial direction of the first cage 15a. By doing so, the lubricating oil stored in the oil reservoir 22a can be appropriately supplied to the width surfaces 25a and 25b of the first retainer 15a.

  In addition, since the oil sump 22a is provided in the width surface 25a, 25b of the both sides of the 1st holder | retainer 15a, when incorporating the 1st holder | retainer 15a, it becomes unnecessary to consider the incorporating direction.

  Here, the oil sump 22a provided in the first retainer 15a is provided in a plurality of continuous grooves along the directions indicated by the arrows A and B of the width surfaces 25a and 25b. Alternatively, the first cage 15a may be provided in a groove shape that is concentrically continuous with the center in the radial direction as the center point.

  FIG. 4 is a view of the first cage in this case as seen from the axial direction. Referring to FIG. 4, the width surfaces 32 on both sides of the first cage 31 have a diameter larger than the inside diameter so as to pass through the pocket 34 with the center 33 of the first cage 31 as the center point. Three groove-like oil reservoirs 35a, 35b, and 35c that are concentrically large and smaller than the outer diameter are provided. Also with this configuration, the lubricating oil can be supplied to the width surface 32 side of the first cage 31. Further, as shown in FIG. 5, a groove-like oil reservoir 39 that is spirally continuous with the center 38 of the first retainer 36 as a center point is provided on the width surface 37 side on both sides of the first retainer 36. You may decide.

  In the above-described embodiment, the continuous groove-shaped oil reservoir 22a and the like are provided. However, the present invention is not limited to this, and it is not continuous in the groove shape. A shaped oil sump may be provided. FIG. 6 is a view of the first cage in this case as seen from the axial direction. Referring to FIG. 6, the width surface 42 of the first cage 41 is provided with a plurality of hollow oil reservoirs 44 that are dispersed independently in the peripheral portion of the pocket 43. Lubricating oil can also be supplied to the width surface 42 side of the first cage 41 by providing such a hole-shaped oil reservoir 44. The number, position, and the like on the width surface 42 where the oil reservoir 44 is provided are arbitrarily determined depending on the life required for the thrust receiving mechanism 11.

  In addition, the shape of the above-described independently dispersed hollow reservoir 44 is, for example, a missing ball, a spherical band, a rectangular parallelepiped, a rectangular parallelepiped, a regular hexagonal column, a cone, a cone excluding the top, a pyramid, a pyramid excluding the top, Examples include cylinders, obelisks, and annular ones.

  In addition, about the shape of the 1st roller 14a hold | maintained at the 1st holder | retainer 15a etc., it is preferable that the crowning is provided. By comprising in this way, the slip at the time of rolling of the 1st roller 14a is suppressed, and the 1st track ring 12a by the contact with the 1st roller 14a, the 1st track ring 12a, and the intermediate ring 13 etc. Wear can be reduced. The crowning may be a full crowning (logarithmic crowning) in which the entire outer shape of the first roller 14a is a crowning shape, or a partial crowning in which a crowning is partially provided on the end face side of the first roller 14a. There may be.

  In addition, about the structure of the 2nd holder | retainer 15b contained in the thrust receiving mechanism 11, the oil reservoir 22b dented in the axial direction is provided in the width surface, and the structure of the above-mentioned first holder 15a etc. Since it is the same, the description is abbreviate | omitted.

  Here, using the thrust receiving mechanism including the cage shown in FIG. 3 and FIG. FIG. 7 is a schematic diagram of the thrust receiving function evaluation device 51 used when measuring the wear amount of the race. Referring to FIG. 7, the thrust receiving mechanism 52 attached between the fixed ring 53 as the housing and the swivel ring 54 is indicated by an arrow G at a position away from the central axis 56 of the rotating shaft 55 by the dimension F. Thrust load is applied from the direction shown. Further, the central axis 57 of the thrust receiving mechanism 52 and the central axis 56 of the rotating shaft 55 are eccentric by the dimension F.

  Specific test conditions including dimension F and dimension G are as follows.

Thrust load: 1000 N (Load position: 12.5 mm from the center axis)
Rotation speed: 1500r / min (revolution radius 2.5mm)
Lubricant: PAG + white kerosene The results of measuring the amount of wear of the bearing ring using the thrust receiving function evaluation device 51 shown in FIG. 7 are shown in FIGS. 8 (A) to 8 (C). FIG. 8A to FIG. 8C are views showing a cross-sectional curve of the raceway, that is, a bus bar shape curve 58a, 58b, 58c of the raceway surface, and are provided for a thrust receiving mechanism including a conventional cage. 8 (A), a bearing ring provided in a thrust receiving mechanism including the cage shown in FIG. 3 (FIG. 8B), and a bearing ring provided in a thrust receiving mechanism including the cage shown in FIG. (FIG. 8C) is shown.

  First, referring to FIG. 8 (A), in the thrust receiving mechanism including the conventional cage, the bus bar shape curve 58a corresponding to the worn portion is greatly depressed downward in the central portion, and the wear amount of the bearing ring is reduced. Has reached 5.4 μm. Next, referring to FIG. 8B, in the thrust receiving mechanism including the retainer shown in FIG. 3, the busbar shape curve 58b corresponding to the worn portion is slightly depressed downward in the central portion. The dent is smaller than that of the prior art, and the wear amount of the race is 1.1 μm. Further, with reference to FIG. 8C, in the thrust receiving mechanism including the cage shown in FIG. 4, the bus bar shape curve 58c corresponding to the worn portion is almost smoothly continuous, and the wear amount of the bearing ring is as follows. 0.7 μm.

  As described above, it is possible to provide a thrust receiving mechanism in which wear of the bearing ring is reduced by providing an oil reservoir on the width surface of the cage and using the cage as a bearing ring guide.

  In the above embodiment, the oil sump is provided on the width surfaces on both sides of the cage. However, the present invention is not limited to this, and the oil sump may be provided only on at least one width surface side. In this case, the bearing ring and the cage may be adsorbed on the other width surface side. For example, by providing a protruding portion protruding in the axial direction on the race ring or the cage side, the cage and the raceway are provided. Adsorption with a ring or the like can be prevented.

  In the above embodiment, the cage included in the thrust receiving mechanism is a resin cage. However, the cage is not limited to this, but a box cage, an aluminum cage, a shaving cage, a press A cage made of various materials, shapes, configurations, and processing methods such as a cage can be applied. In particular, in the case of a box-shaped cage, it is possible to design the plate thickness of the steel plate constituting the box-shaped cage regardless of the radial dimension of the rollers to be held.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  Since the thrust receiving mechanism according to the present invention can reduce the wear of the races, it is effectively used for the thrust receiving mechanism included in a scroll compressor or the like.

It is sectional drawing which shows the principal part of the 1st holder | retainer provided with the groove-like oil reservoir parallel and at right angles with respect to the axial direction of a roller. It is a disassembled perspective view which shows the thrust receiving mechanism which concerns on one Embodiment of this invention. It is the figure which looked at the 1st holder | retainer provided with the groove-like oil reservoir parallel and at right angle with respect to the axial direction of a roller from the axial direction. It is the figure which looked at the 1st holder | retainer provided with three groove-shaped oil sumps which continued concentrically from the axial direction. It is the figure which looked at the 1st holder | retainer provided with the groove-like oil reservoir which continued spirally from the axial direction. It is the figure which looked at the 1st holder | retainer provided with two or more hollow-like oil reservoirs which were disperse | distributed independently from the axial direction. It is the schematic showing a thrust receiving function evaluation apparatus. It is a figure showing the bus-bar shape curve of the bearing ring after performing a thrust abrasion test, (A) Bus-bar shape curve of the bearing ring provided in the thrust receiving mechanism containing the conventional cage, (B) It shows in FIG. FIG. 5C shows a generatrix curve of the raceway ring provided in the thrust receiving mechanism including the cage, and (C) a generatrix curve of the raceway ring provided in the thrust receiving mechanism including the cage shown in FIG. 4. It is a disassembled perspective view showing the conventional thrust receiving mechanism. It is sectional drawing which shows a part of conventional thrust receiving mechanism. It is sectional drawing which shows a part of 1st holder | retainer at the time of making the 1st holder | retainer with which the conventional thrust receiving mechanism is equipped with resin holders. It is sectional drawing which shows a part of 1st holder | retainer at the time of making the 1st holder | retainer with which the conventional thrust receiving mechanism is equipped with a box-shaped holder.

Explanation of symbols

  11, 52, 101 Thrust receiving mechanism, 12a First race ring, 12b Second race ring, 13, 103 Intermediate ring, 14a First roller, 14b Second roller, 15a, 31, 36, 41 First Cage, 15b second cage, 16a first guide pin, 16b second guide pin, 17a, 17b round hole, 18a, 18b, 19a, 19b long hole, 20a housing, 20b rotating member, 21a, 34, 43 Pocket, 22a, 22b, 35a, 35b, 35c, 39, 44 Oil sump, 23a, 23b Roller stop, 24 Center, 25a, 25b, 32, 37, 42 Wide surface, 33, 38 center, 51 Thrust Receiving function evaluation device, 53 fixed wheel, 54 turning wheel, 55 rotating shaft, 56, 57 central axis, 58a, 58b, 58c bus shape curve.

Claims (11)

A thrust receiving mechanism for supporting a thrust load interposed between the first member and the second member that perform eccentric rotational movement between each other, the first bearing ring fixed to the first member; A second race ring fixed to the second member, an intermediate ring arranged between the first race ring and the second race ring, and a plurality arranged between the first race ring and the intermediate ring Between the first roller, the first cage having a plurality of pockets for holding the first roller so that the rolling axes are parallel to each other, and the second raceway ring and the intermediate ring A plurality of second rollers disposed on the second roller, and a second retainer having a plurality of pockets for holding the second rollers such that their rolling axes are parallel to each other. The rolling shaft center of the second roller and the rolling shaft center of the second roller are perpendicular to each other, and pass through the first raceway ring and the first cage from the first member to the middle. A first guide pin extending to the middle ring, and a second guide pin extending from the second member through the second race and the second cage to the intermediate ring, The guide pin is movable in the direction perpendicular to the rolling axis of the first roller within the restriction range of the first cage and intermediate wheel, and the second guide pin is perpendicular to the rolling axis of the second roller. In the thrust receiving mechanism characterized in that it can move within the restricted range of the second cage and the intermediate wheel in the direction to
At least one width surface of the cage is provided with an oil sump recessed in the axial direction,
The retainer is a thrust receiving mechanism that is used as a raceway guide. 2. The thrust receiving mechanism according to claim 1, wherein a depth dimension from a width surface of the oil reservoir is within 20% of an axial dimension of the cage. 3. The thrust receiving mechanism according to claim 1, wherein an axial dimension of the cage is 0.1 to 0.5 mm smaller than a radial dimension of the roller. The thrust receiving mechanism according to claim 1, wherein the oil reservoir is provided on both surfaces of the cage. The thrust receiving mechanism according to any one of claims 1 to 4, wherein the oil sump is a hollow shape dispersed independently. The oil sump is a missing sphere, a spherical zone, a rectangular parallelepiped, a rectangular parallelepiped, a regular hexagonal column, a cone, a truncated cone, a pyramid, a cylinder, a truncated pyramid, an obelisk, or an annular shape. The thrust receiving mechanism according to any one of the above. The thrust receiving mechanism according to any one of claims 1 to 4, wherein the oil reservoir has a continuous groove shape. The thrust receiving mechanism according to claim 7, wherein the oil sump has a groove shape formed concentrically with respect to a center of the cage. The thrust receiving mechanism according to claim 7, wherein the oil reservoir has a groove shape formed in a spiral shape. The thrust receiving mechanism according to any one of claims 1 to 9, wherein the retainer is a resin retainer, an aluminum retainer, a shaving retainer, or a press retainer. The thrust receiving mechanism according to any one of claims 1 to 10, wherein the roller is provided with full crowning or partial crowning including logarithmic crowning.

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