JP2018168871A - Follower bearing - Google Patents

Abstract

To provide a follower bearing that prevents occurrence of seizure and can improve durability and allowable thrust load even when induced thrust force acts on a side plate via an outer ring end surface.SOLUTION: A follower bearing includes: a shaft 2 serving as an inner member; an outer ring 3 serving as an outer member; a plurality of rollers 4 serving as a rolling element; a retainer 5 for holding an interval between adjacent rollers; and side plates 7, 8 positioned on both sides of the rotatable outer ring 3. Thrust bearings 22, 23 are disposed at a slide surface coming into slide contact between the side plates 7, 8 and the outer ring 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a follower bearing such as a cam follower and a roller follower used in an industrial machine field such as a conveying device, a machine tool, a printing machine, and a loom.

  Many follower bearings such as a cam follower and a roller follower are used in a guide roller of a conveying device, a cam mechanism of a machine tool, a printing machine, a loom, or the like (Patent Documents 1 and 2).

  As shown in FIG. 5, the cam follower / roller follower 31 includes a shaft 32 as an inner member, an outer ring 33 as an outer member, a plurality of rollers 34 as rolling elements, and an interval between adjacent rollers 34. A retainer 35 to be held, a sealing seal 36 as a sealing member that seals a gap between the shaft 32 and the outer ring 33, and side plates 37 and 38 that restrict the axial movement of the rollers 34 are provided.

  As described above, the cam follower / roller follower 31 has a structure in which the outer ring 33 is rotatably supported by the shaft 32 via the roller 34 and the side plates 37 and 38 are provided at positions on both sides of the outer ring 33 of the shaft 32. Such a roller follower and cam follower 31 are rotations of the outer ring 33, and the outer diameter of the outer ring 33 also serves as a direct track ring (track roller). In use, the induced thrust force generated is , Are received by the side plates 37 and 38.

JP 2011-33142 A JP 2009-36218 A

  By the way, the outer ring 33 is rolling on the track (track). However, due to the influence of the mounting error, the relative inclination between the track and the outer diameter of the outer ring 33, or the induced thrust force is used in the outer ring. It acts on the side plates 37 and 38 via the end face of 33, or acts on the side plates 37 and 38 via the rollers 34, resulting in poor lubrication and problems of galling, wear and temperature rise. There are things to do.

  Accordingly, an object of the present invention is to provide a follower bearing capable of preventing seizure occurrence and improving durability and allowable thrust load even when induced thrust force acts on the side plate via the outer ring end face. To do.

  In order to solve the above-described problems, the present invention provides a shaft as an inner member, an outer ring as an outer member, a plurality of rollers as rolling elements, and a cage that holds an interval between adjacent rollers, In a follower bearing including side plates located on both sides of a rotatable outer ring, a thrust bearing is disposed on a sliding surface that is in sliding contact between the side plate and the outer ring.

  According to the present invention, when the outer ring rolls on the track (track), the relative inclination between the track and the outer diameter of the outer ring due to the influence of the mounting error, or, in use, the induced thrust force is generated on the outer ring end surface. Even if it acts on the side plate via the bearing, the thrust force is received by the thrust bearing disposed on the sliding surface that is in sliding contact between the side plate and the outer ring, resulting in poor lubrication, galling, wear, It is possible to prevent a temperature problem from occurring.

It is a fragmentary longitudinal cross-section which shows the follower bearing which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which expands and shows a part of follower bearing which concerns on embodiment of FIG. It is a front view of the retainer of the thrust bearing used for the follower bearing which concerns on embodiment of FIG. It is a longitudinal cross-sectional view which expands and shows a part of thrust bearing of FIG. It is a fragmentary longitudinal cross-section which shows the conventional follower bearing.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  A follower bearing 1 shown in FIG. 1 includes a shaft 2 as an inner member, an outer ring 3 as an outer member, a plurality of rollers 4 as rolling elements, and a cage 5 that holds a gap between adjacent rollers 4. A sealing seal 6 as a sealing member for sealing a gap between the shaft 2 and the outer ring 3 and side plates 7 and 8 for restricting the axial movement of the rollers 4 are provided.

  A flange portion extending toward the outer diameter side is integrally formed at one end portion on the outer side of the shaft 2, and this flange portion constitutes the side plate 7. The outer diameter surface of the shaft 2 is provided with an inner raceway surface 9 on which the rollers 4 abut in order from the side plate 7 in the axial direction, a press-fitting portion 11 via a step portion 10, and a mounting portion 13 via a minute step portion 12. ing. A screw portion 14 is provided at the distal end portion of the attachment portion 13. The side plate 8 is press-fitted and fixed to the outer diameter surface of the press-fitting portion 11 of the shaft 2.

  A lubricant supply hole 15 extending from the outer end surface to the attachment portion 13 is provided at the center of the shaft 2. The lubricant supply hole 15 is open to the inner raceway surface 9 and the outer diameter surface of the attachment portion 13.

  On the outer end surface of the outer ring 3, an annular outer end concave portion 16 and a similar inner end concave portion 17 are provided coaxially on the inner end portion, and the seal grooves 18 and 19 provided in the concave portions 16 and 17, respectively, An outer end lip seal 20 and an inner end lip seal 21 constituting the hermetic seal 6 are mounted.

  Thrust bearings 22 and 23 are mounted between the side plate 7 and the outer end recess 16 of the outer ring 3 and between the side plate 8 and the inner end recess of the outer ring 3, respectively.

  As the thrust bearings 22 and 23, thrust needle bearings can be used.

  As shown in FIGS. 3 and 4, for example, the thrust needle bearing includes a thrust retainer 24 in which pockets 24a are arranged in the circumferential direction, and needle rollers 25 accommodated in the pockets 24a. The thrust holder 24 is formed, for example, by bending a metal plate.

  The side plate 7 is provided with a stepped portion 7a that the outer end lip seal 20 contacts on the outer end side, and the raceway surface 7b of the thrust bearing 22 is formed on the inner end surface. Further, a step portion for accommodating the thrust bearing 22 is provided on the inner end face of the side plate 7.

  Further, the annular outer end recess 16 on the outer end surface of the outer ring 3 constitutes a raceway surface of the thrust bearing 22. Further, the annular recess 17 on the inner end surface of the outer ring 3 constitutes a raceway surface of the thrust bearing 23.

  The side plate 8 is provided with a step portion 8a on the inner end side with which the inner end lip seal 21 contacts. Further, the outer end surface of the side plate 8 constitutes a raceway surface 8b of the thrust bearing 23, and a step portion 8c for accommodating the thrust bearing 23 is provided on the inner diameter side.

  As described above, the outer ring 3 rolls on the track. Then, due to the influence of the mounting error, the relative inclination between the track and the outer diameter of the outer ring 3, or, in use, the induced thrust force acts on the side plates 7 and 8 via the end face of the outer ring 3, or Even if it acts on the side plates 7 and 8 via the rollers 4, the thrust force is received by the thrust bearings 22 and 23 disposed on the sliding surfaces that make sliding contact between the side plates 7 and 8 and the outer ring 3, It is possible to prevent the lubrication state from getting worse and the problem of galling, wear, and temperature rise to occur.

  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.

1: follower bearing 2: shaft 3: outer ring 5: cage 6: sealing seal 7: side plate 7a: stepped portion 7b: raceway surface 8: side plate 8a: stepped portion 8b: raceway surface 8c: stepped portion 9: inner raceway surface 10 : Step part 11: Press-fit part 12: Step part 13: Mounting part 14: Screw part 15: Lubricant supply hole 16: Outer end concave part 17: Inner end concave part 18: Seal groove 19: Seal groove 20: Outer end lip seal 21 : Inner end lip seals 22 and 23: Thrust bearing 24: Thrust retainer 24a: Pocket

Claims (3)

  A shaft as an inner member, an outer ring as an outer member, a plurality of rollers as rolling elements, a retainer that holds a gap between adjacent rollers, and side plates positioned on both sides of the rotatable outer ring. Further, in the follower bearing, a thrust bearing is disposed on a sliding surface that is in sliding contact between the side plate and the outer ring.   The follower bearing according to claim 1, wherein the thrust bearing is a thrust needle bearing.   The follower bearing according to claim 1, wherein a lubricant supply hole is provided at a center of the shaft.

Images