JP2020186783A - Follower bearing - Google Patents

Abstract

To provide a follower bearing which can suppress aggression to the other member contacting with an outer ring, and can suppress an operation sound while reducing the number of part items by employing a member which is integrated with a second member to a seal part.SOLUTION: A follower bearing 1 comprises: a shaft member 30 having a circular first raceway surface 11 on an external peripheral face; an outer ring 60 having a circular second raceway surface 41 facing the first raceway surface 11; and a plurality of rollers 70 which are arranged on a circular raceway along the first raceway surface 11 and the second raceway surface 41 so as to contact with the first raceway surface 11 and the second raceway surface 41. The outer ring 60 includes a circular first member 40 including the second raceway surface 41, and composed of steel, and a circular second member 50 composed of resin, and covering an external peripheral face of the first member 40. Circular seal parts 55, 56 protruding in a radial direction toward an external peripheral face of the shaft member 30 are formed at an internal peripheral face 51 of the second member 50.SELECTED DRAWING: Figure 4

Description

The present invention relates to a follower bearing.

Follower bearings in which the outer ring rotates while in contact with other members are known (see, for example, Patent Document 1). Patent Document 1 discloses a follower bearing that is fixed to an outer ring and has a sealing seal that is separate from the outer ring and the inner ring. Further, as a bearing used as a guide roller for a sliding door of a vehicle, a bearing in which a resin outer skin is attached to an outer ring has been proposed for the purpose of improving quietness (see, for example, Patent Document 2). According to Patent Document 2, by intermittently forming a plurality of anti-rotation uneven engaging portions on the outer peripheral surface of the outer ring in the circumferential direction, it is possible to prevent the resin outer skin from coming off from the outer ring due to aged deterioration or the like. There is. The bearing of Patent Document 2 also employs a seal member that is separate from the inner ring and the outer ring.

Japanese Unexamined Patent Publication No. 2008-157370 Japanese Unexamined Patent Publication No. 2008-05902

Similarly to the bearing for the guide roller of Patent Document 2, the follower bearing may be required to suppress the operating noise. In addition, it may be required to suppress aggression to other members in contact with the outer ring. Further, in the follower bearing, it is preferable to reduce the number of parts from the viewpoint of facilitating assembly and maintenance and reducing the cost. One of the objects of the present invention is to provide a follower bearing capable of suppressing aggression against other members in contact with the outer ring and suppressing operating noise while reducing the number of parts. ..

The follower bearing according to the present invention includes an inner member having an annular first raceway surface on the outer peripheral surface, an outer ring having an annular second raceway surface facing the first raceway surface on the inner peripheral surface, and a first ring. A plurality of rolling elements arranged so as to come into contact with the first orbital surface and the second orbital surface on an annular orbit along the one orbital surface and the second orbital surface are provided. The outer ring includes a second raceway surface, an annular first member made of steel, and an annular second member made of resin and covering the outer peripheral surface of the first member. An annular seal portion is formed on the inner peripheral surface of the second member so as to project inward in the radial direction toward the outer peripheral surface of the inner member.

According to the follower bearing, since the seal portion is a member integrated with the outer ring, it is possible to suppress the aggression to other members in contact with the outer ring and suppress the operating noise while reducing the number of parts. it can.

FIG. 1 is a schematic perspective view showing the structure of a follower bearing. FIG. 2 is a schematic perspective view showing the structure of the first member of the outer ring. FIG. 3 is a schematic perspective view showing the structure of the second member of the outer ring. FIG. 4 is a schematic cross-sectional view showing the structure of the follower bearing. FIG. 5 is a schematic cross-sectional view showing an enlarged region α of FIG. FIG. 6 is a schematic cross-sectional view showing a first modification of the shape of the seal portion. FIG. 7 is a schematic cross-sectional view showing a second modification of the shape of the seal portion.

[Outline of Embodiment]
The follower bearing of the present application includes an inner member having an annular first raceway surface on the outer peripheral surface, an outer ring having an annular second raceway surface facing the first raceway surface on the inner peripheral surface, and a first raceway surface. And a plurality of rolling elements arranged so as to come into contact with the first orbital surface and the second orbital surface on the annular orbit along the second orbital surface. The outer ring includes a second raceway surface, an annular first member made of steel, and an annular second member made of resin and covering the outer peripheral surface of the first member. An annular seal portion is formed on the inner peripheral surface of the second member so as to project inward in the radial direction toward the outer peripheral surface of the inner member.

In the follower bearing of the present application, the outer ring includes a second member made of resin. As a result, the aggression to other members in contact with the outer ring can be suppressed and the operating noise can be suppressed. Further, in the follower bearing of the present application, a seal portion integrated with the second member is formed on the inner peripheral surface of the second member so as to project inward in the radial direction toward the outer peripheral surface of the inner member. As a result, the number of parts can be reduced as compared with the case where a separate seal member is arranged between the outer ring and the inner member. As described above, according to the follower bearing of the present application, it is possible to suppress the aggression to other members in contact with the outer ring and suppress the operating noise while reducing the number of parts. In the present application, "resin" includes rubber. That is, the second member may be made of rubber. Further, in the present application, the "second member made of resin" includes a second member made of fiber reinforced resin. That is, the resin constituting the second member may contain reinforcing fibers. As the reinforcing fiber, for example, glass fiber, carbon fiber and the like can be adopted. Further, the seal portion may come into contact with the outer peripheral surface of the inner member at the tip, or the tip of the seal portion and the outer peripheral surface of the inner member may face each other with a slight gap between them. That is, the seal portion may be in contact with the inner member or may be slightly separated from the inner member as long as it functions to suppress the invasion of foreign matter into the bearing from the outside and the leakage of grease or the like from the inside of the bearing. Good.

In the follower bearing of the present application, at least one of a first convex portion and a first concave portion may be formed on the first member. The second member has a shape corresponding to the first convex portion, a second concave portion into which the first convex portion enters, and a second convex portion having a shape corresponding to the first concave portion and entering the first concave portion. At least one of them may be formed. By doing so, it is possible to prevent the second member from slipping relative to the first member.

In the follower bearing of the present application, a plurality of at least one of the first convex portion and the first concave portion may be arranged at intervals in the circumferential direction of the first member. A plurality of at least one of the second concave portion and the second convex portion may be arranged at intervals in the circumferential direction of the second member. By doing so, it is possible to more reliably prevent the second member from slipping relative to the first member.

In the follower bearing of the present application, the inner member may include a rod-shaped main body portion and a plate-shaped flange portion formed at one end of the main body portion and having a diameter larger than that of the main body portion. The seal portion may protrude toward the outer peripheral surface of the collar portion. By doing so, the function of the seal portion formed on the second member can be easily achieved.

In the follower bearing of the present application, the inner member may include a rod-shaped main body portion and a plate-shaped flange portion formed at one end of the main body portion and having a diameter larger than that of the main body portion. The collar portion and the first member may face each other in the axial direction. The inner peripheral surface of the second member may be formed with a first protruding portion that protrudes in the radial direction and enters between the collar portion and the first member. By doing so, when an inner member having a collar portion is adopted, contact between the collar portion and the first member can be suppressed.

In the follower bearing of the present application, the inner member may include a rod-shaped main body portion and a ring coaxially installed on the main body portion so as to surround a part of the outer peripheral surface of the main body portion in the circumferential direction. .. The seal portion may protrude toward the outer peripheral surface of the ring. By doing so, the function of the seal portion formed on the second member can be easily achieved.

In the follower bearing of the present application, the inner member may include a rod-shaped main body portion and a ring coaxially installed on the main body portion so as to surround a part of the outer peripheral surface of the main body portion in the circumferential direction. .. The ring and the first member may face each other in the axial direction. A second protruding portion that protrudes in the radial direction and enters between the ring and the first member may be formed on the inner peripheral surface of the second member. By doing so, when an inner member having a ring is used, it is possible to prevent the ring from coming into contact with the first member.

In the follower bearing of the present application, the resin constituting the second member may be at least one resin selected from the group consisting of nylon, polyacetal, polyphenylene sulfide and polyimide. Nylon, polyacetal, polyphenylene sulfide and polyimide are suitable as resins constituting the second member.

In the follower bearing of the present application, the seal portion includes the first seal portion arranged in a region closer to one end of the inner member than the first member in the axial direction, and the seal portion inward of the first member in the axial direction. It may include a second seal portion that is located in a region far from the one end of the member. By arranging the seal portions on both sides of the first member in the axial direction in this way, it is possible to more reliably suppress the leakage of lubricant such as grease from the inside of the bearing and the invasion of foreign matter from the outside into the bearing. it can.

In the follower bearing of the present application, the rolling element may be a roller. By doing so, it becomes easy to achieve a sufficient load capacity while suppressing the cross-sectional height of the follower bearing.

[Specific example of embodiment]
Next, an example of a specific embodiment of the follower bearing of the present application will be described with reference to the drawings. In the drawings below, the same or corresponding parts are given the same reference number and the explanation is not repeated.

FIG. 1 is a schematic perspective view showing a structure of a follower bearing according to an embodiment of the present application. In FIG. 1, a state in which some parts are partially cut is shown from the viewpoint of displaying the internal structure. In FIG. 1, the hatched region corresponds to a cross section. FIG. 2 is a schematic perspective view showing the structure of the first member of the outer ring. FIG. 3 is a schematic perspective view showing the structure of the second member of the outer ring. FIG. 4 is a schematic cross-sectional view showing the structure of the follower bearing. FIG. 4 shows a cross section of the follower bearing including the central shaft of the shaft member. FIG. 5 is a schematic cross-sectional view showing an enlarged region α of FIG.

With reference to FIGS. 1 to 5, the follower bearing 1 in the present embodiment holds a shaft member 30 as an inner member, an outer ring 60, a plurality of rollers 70 as rolling elements, and rollers 70. It is equipped with a vessel 80.

The shaft member 30 has a rod-shaped (solid cylindrical) main body portion 10 and a plate-shaped (disk-shaped) flange portion 12 formed at one end of the main body portion 10 and having a diameter larger than that of the main body portion 10. A side plate 20 which is a ring coaxially installed on the main body 10 so as to surround a part of the outer peripheral surface of the main body 10 in the circumferential direction is included. The main body portion 10 has a first end surface 13 which is one end in the axial direction, and a second end surface 15 which is the other end opposite to the first end surface 13. Both the first end surface 13 and the second end surface 15 have a circular planar shape.

The collar portion 12 is formed so as to include the first end surface 13. As a result, the diameter of the first end surface 13 is larger than the diameter of the second end surface 15. A hexagonal hole 13A having a regular hexagonal columnar shape is formed in a region of the first end surface 13 including a region intersecting the central axis of the shaft member 30. A screw portion 14 having a spiral thread groove formed is arranged in a region of the main body portion 10 including an end portion (the other end portion) on the second end surface 15 side. By having such a structure, when installing the follower bearing 1, for example, the screw portion 14 is screwed into a screw hole (not shown) formed in the holding member holding the follower bearing 1, and a hexagon wrench is inserted into the hexagonal hole 13A. The follower bearing 1 can be fixed to the holding member by inserting and tightening a part of the bearing member, or by screwing the nut into the threaded portion 14 through the shaft member 30 through the housing hole.

The main body portion 10 includes a solid cylindrical shaft portion 17 including a screw portion 14, and a large diameter portion 16 which is arranged between the shaft portion 17 and the flange portion 12 and has a diameter larger than that of the shaft portion 17. The diameter of the large diameter portion 16 is smaller than the diameter of the flange portion 12. A first raceway surface 11 having a cylindrical surface shape is formed on the outer peripheral surface of the large diameter portion 16. That is, the shaft member 30 has an annular first raceway surface 11 on the outer peripheral surface.

The annular side plate 20 has a first end surface 23 which is one end surface, a second end surface 24 which is the other end surface, an outer peripheral surface 21, and an inner peripheral surface 22. The first end face 23 and the second end face 24 are parallel. The outer peripheral surface 21 and the inner peripheral surface 22 are concentric cylindrical surfaces. The side plate 20 is arranged so as to come into contact with the stepped surface 16A (see FIGS. 4 and 5), which is the end surface (stepped portion) of the large diameter portion 16 on the shaft portion 17 side in the axial direction, at the first end surface 23. The side plate 20 has an inner diameter (diameter of the inner peripheral surface 22) corresponding to the outer diameter of the shaft portion 17. The side plate 20 is press-fitted into the shaft portion 17 and fixed to the shaft portion 17. The shaft member 30 is made of steel such as carbon steel for machine structure, alloy steel for machine structure, and bearing steel. The region of the shaft member 30 including at least the first raceway surface 11 of the main body 10 may be quench-hardened. Further, a part or the whole of the side plate 20 may be hardened by quenching.

The outer ring 60 has an annular second raceway surface 41 facing the first raceway surface 11 on the inner peripheral surface. The outer ring 60 includes a first member 40 and a second member 50. The first member 40 has an annular shape. The first member 40 is made of steel. As the steel constituting the first member 40, for example, mild steel, carbon steel for machine structure, alloy steel for machine structure, or the like can be adopted. Further, the first member 40 may be hardened by quenching. The first member 40 may be, for example, a steel plate made of mild steel formed in an annular shape. The first member 40 has a hollow cylindrical shape. The first member 40 has a second raceway surface 41 which is an inner peripheral surface, an outer peripheral surface 42, a first end surface 46 which is one end surface, and a second end surface 47 which is the other end surface. The first member 40 includes a second raceway surface 41. The first end surface 46 of the first member 40 and the flange portion 12 face each other. That is, the collar portion 12 and the first member 40 face each other in the axial direction. The second end surface 47 of the first member 40 and the first end surface 23 of the side plate 20 face each other. That is, the side plate 20 and the first member 40 face each other in the axial direction.

The second member 50 has an annular shape. The second member 50 is made of resin. The resin constituting the second member 50 may be at least one resin selected from the group consisting of, for example, nylon, polyacetal, polyphenylene sulfide, and polyimide. The second member 50 is arranged coaxially with the first member 40. The second member 50 covers the outer peripheral surface 42 of the first member 40 over the entire area. The second member 50 also covers the first end surface 46 and the second end surface 47 of the first member 40.

A first concave portion 44 recessed in the radial direction is formed on the outer peripheral surface 42 of the first member 40. As shown in FIG. 2, a plurality of first recesses 44 are arranged at intervals in the circumferential direction of the outer peripheral surface 42 of the first member 40. The plurality of first recesses 44 are arranged at equal intervals with each other in the circumferential direction. The plurality of first recesses 44 have the same shape. The first recess 44 is formed so as to include an end portion of the outer peripheral surface 42 on the first end surface 46 side in the axial direction. The first recess 44 is formed so as to reach the first end surface 46.

Further, a third concave portion 45 recessed in the radial direction is formed on the inner peripheral surface of the first member 40. As shown in FIG. 2, a plurality of third recesses 45 are arranged at intervals in the circumferential direction of the inner peripheral surface of the first member 40. The plurality of third recesses 45 are arranged at equal intervals with each other in the circumferential direction. The plurality of third recesses 45 have the same shape. The third recess 45 is formed so as to include an end portion of the inner peripheral surface in the axial direction on the side of the second end surface 47. The third recess 45 is formed so as to reach the second end surface 47.

With reference to FIGS. 3 to 5, the second member 50 has an inner peripheral surface 51, an outer peripheral surface 52, a first end surface 53, and a second end surface 54. A second convex portion 57 projecting inward in the radial direction is formed on the inner peripheral surface 51 of the second member 50. As shown in FIG. 3, a plurality of second convex portions 57 are arranged at intervals in the circumferential direction of the inner peripheral surface 51 of the second member 50. The plurality of second convex portions 57 are arranged at equal intervals with each other in the circumferential direction. The plurality of second convex portions 57 have the same shape. The second convex portion 57 has a shape corresponding to the first concave portion 44. The second convex portion 57 is inserted into the first concave portion 44.

Further, on the inner peripheral surface 51 of the second member 50, the second protruding portion 59A protruding inward in the radial direction and the side opposite to the side in the axial direction from the tip of the second protruding portion 59A where the side plate 20 is located are located. A second protruding region 59 is formed including a fourth convex portion 59B that protrudes from the surface. The second protruding portion 59A has entered between the side plate 20 and the first member 40. As shown in FIG. 3, a plurality of second protruding regions 59 are arranged at intervals in the circumferential direction of the inner peripheral surface 51 of the second member 50. The plurality of second protruding regions 59 are arranged at equal intervals with each other in the circumferential direction. The plurality of second protruding regions 59 have the same shape. The fourth convex portion 59B has a shape corresponding to the third concave portion 45. The fourth convex portion 59B is inserted into the third concave portion 45.

In this way, the convex portion formed on the second member 50 enters the concave portion formed on the first member, so that the second member 50 is fixed to the first member 40. Further, in the first member 40, a plurality of first convex portions arranged at equal intervals in the circumferential direction are formed in place of the first concave portion 44 or in addition to the first concave portion 44, similarly to the first concave portion 44. It may have been done. The second member 50 is arranged in place of the second convex portion 57, or in addition to the second convex portion 57, at equal intervals in the circumferential direction like the second convex portion 57, and a plurality of the first convex portions are inserted therein. The second recess may be formed.

The inner peripheral surface 51 of the second member 50 is formed with a first protruding portion 58 that protrudes in the radial direction and enters between the flange portion 12 and the first member 40. The first protruding portion 58 has an annular shape. That is, the first protruding portion 58 is formed over the entire circumference of the inner peripheral surface 51.

The cage 80 has an annular shape. In the present embodiment, the cage 80 is made of steel, but a resin cage can also be adopted. The cage 80 is arranged concentrically with the shaft member 30 and the outer ring 60 in a space sandwiched between the shaft member 30 and the outer ring 60. The cage 80 has a plurality of pockets 81 arranged at equal intervals in the circumferential direction. One roller 70 is arranged in each of the plurality of pockets 81. By being held by the cage 80 in this way, the plurality of rollers 70 are placed on the first raceway surface 11 and the second raceway surface 41 on the annular track along the first raceway surface 11 and the second raceway surface 41. Arranged to make contact. The roller 70 has a solid cylindrical shape. The roller 70 has a cylindrical outer peripheral surface 71 and a pair of spherical end surfaces 72. The end face 72 of the roller 70 may be flat. The rollers 70 are in contact with the first raceway surface 11 and the second raceway surface 41 on the outer peripheral surface 71. The roller 70 is made of steel such as bearing steel. The roller 70 may be quench-hardened.

The region including the end portion of the inner peripheral surface 51 of the second member 50 in the axial direction on the first end surface 13 side faces the outer peripheral surface 12A of the flange portion 12. Then, in the region of the inner peripheral surface 51 of the second member 50 facing the outer peripheral surface 12A, an annular first seal portion 56 that protrudes in the radial direction toward the outer peripheral surface 12A and contacts the outer peripheral surface 12A at the tip is formed. Has been done. In this embodiment, a plurality, more specifically, two (double lip) first seal portions 56 are arranged parallel to each other. The first seal portion 56 is arranged in a region closer to the first end surface 13 of the main body portion 10 of the shaft member 30 than the first member 40 in the axial direction.

The region including the end portion of the inner peripheral surface 51 of the second member 50 in the axial direction on the second end surface 15 side faces the outer peripheral surface 21 of the side plate 20. Then, in the region of the inner peripheral surface 51 of the second member 50 facing the outer peripheral surface 21, an annular second seal portion 55 that protrudes in the radial direction toward the outer peripheral surface 21 and contacts the outer peripheral surface 21 at the tip is formed. Has been done. In the present embodiment, a plurality, more specifically, two second seal portions 55 are arranged in parallel with each other. The second seal portion 55 is arranged in a region farther from the first end surface 13 of the main body portion 10 of the shaft member 30 than the first member 40 (a region on the screw portion 14 side, a region closer to the second end surface 15) in the axial direction. ing. That is, in the present embodiment, the first seal portion 56 and the second seal portion 55 are arranged so as to close both ends in the axial direction of the space between the shaft member 30 and the outer ring 60. The first seal portion 56 and the second seal portion 55 are a part of the second member 50 and are integrally formed with the second member 50.

In the follower bearing 1 of the present embodiment, the shaft member 30, the outer ring 60, the cage 80, and the plurality of rollers 70 are arranged as described above, so that the outer ring 60 rotates relative to the shaft member 30. It can rotate in the direction. Further, in the follower bearing 1 of the present embodiment, the first seal portion 56 and the second seal portion 55 are arranged as described above, so that the increase in the rotational torque of the outer ring 60 is suppressed and the inside of the bearing ( It is possible to suppress the leakage of a lubricant such as grease from the space between the shaft member 30 and the outer ring 60 and the invasion of foreign matter from the outside into the bearing.

Further, in the follower bearing 1 of the present embodiment, the outer ring 60 includes a second member 50 made of resin. As a result, aggression to other members in contact with the outer peripheral surface 52 of the outer ring 60 and suppression of operating noise are achieved. Further, the frequency of supplying the lubricant between the outer peripheral surface 52 of the outer ring 60 and the other member can be reduced, or the supply of the lubricant can be abolished. As a result, maintenance reduction or maintenance-free can be achieved. From such a viewpoint, it is preferable to use a self-lubricating resin such as polyacetal as the resin constituting the second member 50. By abolishing the supply of the lubricant, it becomes easy to apply it to applications for which prevention of oil scattering is desired, for example, equipment for manufacturing and processing foods, medical machines, semiconductor manufacturing equipment and the like. Further, since the outer ring 60 includes the second member 50 made of resin, it is possible to suppress the occurrence of rust at the contact portion with the other member. As a result, dust generation due to scattering of rust is suppressed, and it becomes easy to apply to applications in which suppression of dust generation is desired, such as semiconductor manufacturing equipment and electronic component manufacturing equipment.

Further, in the follower bearing 1 of the present embodiment, the inner peripheral surface 51 of the second member 50 comes into contact with the outer peripheral surface 12A of the flange portion 12, which is the outer peripheral surface of the shaft member 30, and the outer peripheral surface 21 of the side plate 20 at the tip. The first seal portion 56 and the second seal portion 55 are formed. As a result, the number of parts can be reduced as compared with the case where a separate seal member is arranged between the outer ring 60 and the shaft member 30. Further, since the first seal portion 56 and the second seal portion 55 are integrated with the second member 50, the seal member may come off due to an excessive supply of grease or the like as in the case of arranging a separate seal member. Can be avoided. As described above, the follower bearing 1 of the present embodiment can achieve suppression of aggression to other members in contact with the outer ring 60 and suppression of operating noise while reducing the number of parts. It has become.

In the follower bearing 1 of the present embodiment, the first member 40 is formed with the first concave portion 44 and the third concave portion 45, and the second member 50 has the second convex portion 57 and the second concave portion 57 that enter into the first concave portion 44. A fourth convex portion 59B that enters the three concave portions 45 is formed. By adopting such a structure, the second member 50 can be firmly fixed to the first member 40 and can be prevented from slipping relatively.

In the follower bearing 1 of the present embodiment, a plurality of first recesses 44 and third recesses 45 are arranged at intervals in the circumferential direction of the first member 40, and the first protrusion 58 and the fourth protrusion 59B are arranged. Are arranged at intervals in the circumferential direction of the second member 50. By adopting such a structure, the second member 50 is firmly fixed to the first member 40, and it is possible to more reliably suppress the relative slippage.

In the follower bearing 1 of the present embodiment, the shaft member 30 includes a rod-shaped main body portion 10 and a flange portion 12 formed at one end of the main body portion 10. The outer peripheral surface 12A of the flange portion 12 and the tip of the first seal portion 56 are in contact with each other. By adopting such a structure, it is possible to easily achieve a structure in which the first seal 56 formed on the second member 50 and the shaft member 30 are brought into contact with each other.

In the follower bearing 1 of the present embodiment, the shaft member 30 includes a rod-shaped main body portion 10 and a flange portion 12 formed at one end of the main body portion 10. The collar portion 12 and the first member 40 face each other in the axial direction. The inner peripheral surface 51 of the second member 50 is formed with a first protruding portion 58 that protrudes in the radial direction and enters between the flange portion 12 and the first member 40. By adopting such a structure, when the shaft member 30 having the flange portion 12 is adopted, it is possible to prevent the collar portion 12 and the first member 40 from coming into metal contact with each other.

In the follower bearing 1 of the present embodiment, the shaft member 30 includes a rod-shaped main body portion 10 and a side plate 20 coaxially installed on the main body portion 10 so as to surround a part of the outer peripheral surface of the main body portion 10 in the circumferential direction. , Including. The outer peripheral surface 21 of the side plate 20 and the tip of the second seal portion 55 are in contact with each other. By adopting such a structure, it is possible to easily achieve a structure in which the second seal portion 55 formed on the second member 50 and the shaft member 30 are brought into contact with each other.

In the follower bearing 1 of the present embodiment, the shaft member 30 includes a rod-shaped main body 10 and a side plate 20 coaxially installed on the main body 10 so as to surround a part of the outer peripheral surface of the main body 10 in the circumferential direction. , Including. The side plate 20 and the first member 40 face each other in the axial direction. A second protruding portion 59A that protrudes in the radial direction and enters between the side plate 20 and the first member 40 is formed on the inner peripheral surface 51 of the second member 50. By adopting such a structure, when the shaft member 30 having the side plate 20 is adopted, it is possible to prevent the side plate 20 and the first member 40 from coming into metal contact with each other.

In the follower bearing 1 of the present embodiment, the seal portion is the first seal portion 56 arranged in a region closer to one end portion (first end surface 13) of the shaft member 30 than the first member 40 in the axial direction. The second seal portion 55 is arranged in a region farther from the one end portion (first end surface 13) of the shaft member 30 than the first member 40 in the axial direction. By arranging the first seal portion 56 and the second seal portion 55 on both sides of the first member 40 in the axial direction in this way, a lubricant such as grease leaks from the inside of the bearing and foreign matter from the outside to the inside of the bearing. Invasion can be suppressed more reliably.

In the follower bearing of the present application, the resin constituting the second member is not particularly limited, and a resin having appropriate wear resistance, hardness and the like can be adopted depending on the application. Specifically, it may be at least one resin selected from the group consisting of, for example, nylon, polyacetal, polyphenylene sulfide and polyimide. Nylon, polyacetal, polyphenylene sulfide and polyimide are suitable as resins constituting the second member. Further, rubber (including natural rubber and synthetic rubber) may be adopted as the resin constituting the second member. Further, the resin constituting the second member may contain reinforcing fibers. As the reinforcing fiber, for example, glass fiber, carbon fiber and the like can be adopted.

In the above embodiment, the case where the roller 70 is adopted as the rolling element of the follower bearing 1 has been described, but a ball may be adopted as the rolling element. Further, in the above embodiment, the case where the rolling elements are arranged in a single row has been described, but the rolling elements may be arranged in a plurality of rows. Further, in the outer ring 60 of the present embodiment, for example, the first member 40 obtained by processing a steel plate into a desired shape is placed in a cavity of a mold having a desired shape of the outer ring 60, and the first member 40 is placed in the cavity. It can be manufactured by injection molding in which a softened resin is poured and solidified. In the present embodiment, the second member 50 is integrally molded with the first member 40. Further, in the above embodiment, the case where the solid shaft member 30 is adopted as the inner member has been described, but for example, a raceway ring (inner ring) may be adopted as the inner member.

In the above embodiment, the first seal portion 56 and the second seal portion 55 have a shape that becomes thinner as they approach the tip as shown in FIG. 5 (a triangular shape in a cross section including the central axis of the follower bearing). Although the case has been described, the shape of the seal portion is not limited to this, and any appropriate shape can be adopted depending on the application and the like. With reference to FIG. 6, as the seal portion which is the first modification of the seal portion, the first seal portion 56a and the second seal portion 55a having an arcuate surface in the cross section including the shaft of the follower bearing May be adopted. Further, referring to FIG. 7, the seal portion, which is a second modification of the seal portion, is inclined outward in the axial direction from the inner peripheral surface 51 of the second member 50 in the cross section including the shaft of the follower bearing. A protruding lip-shaped first seal portion 56b and a second seal portion 55b may be adopted. Further, in the above embodiment, the case where the first seal portions 56, 56a, 56b and the second seal portions 55, 55a, 55b come into contact with the shaft member 30, which is an inner member, respectively, has been described. It may be non-contact with a slight interval of 30.

In the present application, the follower bearing refers to a bearing in which the outer ring rotates relative to the shaft member in the circumferential direction while the outer ring is in contact with another member while the shaft member is fixed. The other member is not particularly limited, and may be, for example, a cam, a rail, or a belt.

It should be understood that the embodiments disclosed here are exemplary in all respects and are not restrictive in any way. The scope of the present invention is defined by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

1 Follower bearing, 10 Main body, 11 1st raceway surface, 12 flange part, 12A outer peripheral surface, 13 1st end surface, 13A hexagonal hole, 14 threaded part, 15 2nd end surface, 16 large diameter part, 16A stepped surface, 17 Shaft, 20 side plate, 21 outer peripheral surface, 22 inner peripheral surface, 23 first end surface, 24 second end surface, 30 shaft member (inner member), 40 first member, 41 second raceway surface, 42 outer peripheral surface, 44 1st recess, 45 3rd recess, 46 1st end face, 47 2nd end face, 50 2nd member, 51 inner peripheral surface, 52 outer peripheral surface, 53 1st end face, 54 2nd end face, 55, 55a, 55b 2nd Seal part, 56, 56a, 56b 1st seal part, 57 2nd convex part, 58 1st protruding part, 59 2nd protruding area, 59A 2nd protruding part, 59B 4th convex part, 60 outer ring, 70 rollers, 71 Outer surface, 72 end faces, 80 cages, 81 pockets.

Claims (8)

An inner member having an annular first raceway surface on the outer peripheral surface,
An outer ring having an annular second raceway surface facing the first raceway surface on the inner peripheral surface,
A plurality of rolling elements arranged so as to come into contact with the first orbital surface and the second orbital surface on the first orbital surface and the annular orbit along the second orbital surface are provided.
The outer ring
An annular first member including the second raceway surface and made of steel,
Includes an annular second member made of resin and covering the outer peripheral surface of the first member.
A follower bearing in which an annular seal portion that protrudes inward in the radial direction toward the outer peripheral surface of the inner member is formed on the inner peripheral surface of the second member. At least one of a first convex portion and a first concave portion is formed on the first member.
The second member has a shape corresponding to the first convex portion, a second concave portion into which the first convex portion enters, and a shape corresponding to the first concave portion, and enters the first concave portion. The follower bearing according to claim 1, wherein at least one of the second convex portions is formed. A plurality of at least one of the first convex portion and the first concave portion is arranged at intervals in the circumferential direction of the first member.
The follower bearing according to claim 2, wherein a plurality of the second concave portion and at least one of the second convex portions are arranged at intervals in the circumferential direction of the second member. The inner member is
The rod-shaped body and
A plate-shaped collar formed at one end of the main body and having a diameter larger than that of the main body is included.
The collar portion and the first member face each other in the axial direction,
Any of claims 1 to 3, wherein a first protruding portion that protrudes in the radial direction and enters between the flange portion and the first member is formed on the inner peripheral surface of the second member. The follower bearing according to item 1. The inner member is
The rod-shaped body and
Includes a ring coaxially installed on the main body so as to surround a part of the outer peripheral surface of the main body in the circumferential direction.
The ring and the first member face each other in the axial direction,
Any one of claims 1 to 4, wherein a second protruding portion that protrudes in the radial direction and enters between the ring and the first member is formed on the inner peripheral surface of the second member. Follower bearings as described in the section. The follower bearing according to any one of claims 1 to 5, wherein the resin constituting the second member is at least one resin selected from the group consisting of nylon, polyacetal, polyphenylene sulfide, and polyimide. The seal portion is
A first seal portion arranged in a region closer to one end of the inner member than the first member in the axial direction, and a first seal portion.
The first item according to any one of claims 1 to 6, further comprising a second seal portion arranged in a region farther from the one end portion of the inner member than the first member in the axial direction. Follower bearing. The follower bearing according to any one of claims 1 to 7, wherein the rolling element is a roller.

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