JP2009275716A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing which has a high productivity and low manufacturing cost, is also reliable in contamination of a component, and also can achieve the behavior of a light and stable holder. <P>SOLUTION: A cone roller 4 having a through-hole 41 extending along an axis center is disposed between the cone track face 11 of an outer ring 1 and the cone track face 21 of an inner ring 2. To the through-hole 39 of a ring 31, one end part of a pin 32 is secured by screwing and to the periphery of the other end part of the pin 32, a ball bearing 33 is secured by inserting outside. Each pin 32 is inserted into the through-hole 41 of the cone roller 4. The periphery 38 of the ball bearing 33 is guided by the periphery of the inner ring 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a roller bearing. In particular, the present invention relates to a roller bearing in which a rolling element is a tapered roller having a through hole along the axis center, and a roller bearing in which the rolling element is a cylindrical roller having a through hole along the axis center.

  Conventionally, as a roller bearing, there is a tapered roller bearing described in JP-A No. 2005-114006.

  The tapered roller bearing includes an outer ring, an inner ring, and a cage assembly. The outer ring has no flanges on both sides in the axial direction of the conical raceway surface, while the inner ring has a large collar on the large diameter side in the axial direction of the conical raceway surface, and the axis of the conical raceway surface Has a small wrinkle on the small diameter side of the direction.

  The cage assembly includes a plurality of tapered rollers and a pin type cage.

  Each of the tapered rollers has a through hole extending along the axial center thereof. The pin type retainer has a small-diameter annular portion, a large-diameter annular portion, and a plurality of pins. The small-diameter annular portion has through holes at regular intervals in the circumferential direction, while the large-diameter annular portion has a circumferential direction and the like. There are screw holes in the interval.

  In the cage assembly, after inserting a pin into the through hole of the tapered roller, a part of the portion protruding from the opening of the small diameter side through hole of the outer peripheral surface of the tapered roller is used as the through hole of the small diameter annular portion. After the insertion, a part thereof is fixed to the through hole of the small diameter annular portion by welding, while the portion protruding from the opening of the large diameter side through hole of the conical outer peripheral surface of the tapered roller is the portion of the large diameter annular portion. It is formed by being screwed into the screw hole.

  In the tapered roller bearing described above, after creating the cage assembly, even if the cage assembly is assembled to the inner ring, the small ring of the inner ring comes into contact with the large-diameter end surface of the tapered roller, and the cage assembly is assembled to the inner ring. I can't.

Therefore, the conventional tapered roller bearing is assembled by arranging a plurality of tapered rollers on the conical raceway surface of the inner ring, assembling the pin type cage, and finally assembling the outer ring.
Japanese Patent Laying-Open No. 2005-114006 (FIG. 1)

  In the conventional tapered roller, since the retainer must be assembled after the tapered roller is arranged on the conical raceway surface of the inner ring, the degree of freedom in assembly is low and it is difficult to assemble.

  In addition, the conventional tapered roller has to be assembled with a pin type cage after disposing a plurality of tapered rollers on the conical raceway surface of the inner ring. In the welding process at the time of assembling the pin type cage, It is difficult to avoid spattering due to this, and this spattering contaminates the outer peripheral surface of the inner ring. Further, many man-hours are required to remove the spatter scattered on the outer peripheral surface of the inner ring, and the productivity is remarkably deteriorated and the manufacturing cost is increased.

  In particular, since the tapered roller bearing for supporting the main shaft of the wind power generator is very large, it is difficult to remove the spatter. Furthermore, there is a demand for reducing the weight and stabilizing the behavior of the cage, particularly for large bearings.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a roller bearing that has high productivity, low manufacturing cost, no concern about contamination of components, and is light and can realize stable cage behavior. is there.

In order to solve the above problems, the roller bearing of the present invention is
An outer ring having a raceway surface;
An inner ring having a raceway surface;
A plurality of rollers disposed between the raceway surface of the outer ring and the raceway surface of the inner ring;
A ring portion, a plurality of rod-shaped portions connected to the ring portion and spaced apart from each other in the circumferential direction of the ring portion, and an end portion of each rod-shaped portion opposite to the ring portion side A cage having a bearing attached to each of the outer peripheral surfaces,
Each of the above rollers has a through hole extending along the axial center of the roller,
The rod-shaped portion is inserted through the through hole of the roller,
The outer peripheral surface of the bearing is guided by the outer peripheral surface of the inner ring.

  In addition, as a bearing attached to each said rod-shaped part, for example, a bearing having a rolling element such as a ball or a roller (which may or may not have an inner ring) or a sliding bearing not having a rolling element Etc.

  According to the present invention, the end of each cage portion opposite to the ring portion side has a configuration in which a bearing is attached to the outer peripheral surface of the rod portion, and holds the end portion of the rod portion. For example, in the case where the ring part and the rod-like part are configured by welding and fixing a pin to the through hole of the ring, the cage and Even after the cage assembly composed of rollers is configured, the cage assembly can be incorporated into the inner ring so that the end of the pin opposite to the ring side is distorted. Accordingly, in the configuration in which the pin is fixed to the ring portion, when welding is used as the fixing means, spatter generated during welding does not contaminate the inner ring, and spatter does not adhere to the inner ring. It is not necessary to remove spatter from the inner ring, and productivity can be improved.

  When the ring part and the rod-like part are configured by fixing a pin to the through hole of the ring, the one end part of the pin is fixed to the through hole of the ring by means other than welding, such as press fitting or screwing. Of course you can. Of course, the ring portion and the rod-like portion may be integrally formed by press molding.

  Further, according to the present invention, the structure of the cage is such that the ring on one side of the cage is compared with the corresponding pin cage, that is, the pin cage having two ring portions and a plurality of rod-like portions. Since it is the structure which arrange | positions several lightweight and cheap bearings instead of a part, while being able to lighten a roller bearing, the manufacturing cost of a roller bearing can be reduced. In particular, when the size of the roller bearing is large, the roller bearing can be significantly reduced in weight, and the manufacturing cost of the roller bearing can be significantly reduced.

  According to the present invention, since the outer peripheral surface of the bearing of the cage is guided by the outer peripheral surface of the inner ring, the behavior of the cage can be stabilized.

  According to the roller bearing of the present invention, the inner ring is not contaminated by spatter, and it is not necessary to remove spatter from the inner ring, so that productivity is improved.

  In addition, according to the roller bearing of the present invention, a light and inexpensive bearing can be arranged on one side of the cage instead of the heavy and expensive annular portion. The manufacturing cost of the roller bearing can be reduced.

  Further, according to the roller bearing of the present invention, since the outer peripheral surface of the bearing of the cage is guided by the outer peripheral surface of the inner ring, the behavior of the cage can be stabilized.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view in the axial direction of a tapered roller bearing according to an embodiment of the roller bearing of the present invention.

  The tapered roller bearing includes an outer ring 1, an inner ring 2, a cage 3, and a plurality of tapered rollers 4.

  The outer ring 1 has a conical raceway surface 11 as a raceway surface on the inner peripheral side.

  On the other hand, the inner ring 2 has a conical raceway surface 21 as a raceway surface on the outer peripheral side. The inner ring 2 has a small flange portion 22 on the small diameter side of the conical raceway surface 21, and a large collar portion 23 on the large diameter side of the conical raceway surface 21.

  The cage 3 includes a ring 31 that is a ring portion, a plurality of pins 32, a ball bearing 33, and a nut 34.

  The ring 31 has a plurality of through holes 39. The plurality of through holes 39 are arranged at substantially the same interval in the circumferential direction of the ring 31. A female thread is formed on the inner peripheral surface of each through hole 39 of the ring 31.

  Each pin 32 constitutes a rod-like part. A male screw is formed on the outer peripheral surface of one end of the pin 32. The outer peripheral surface of the other end portion of the pin 32 has a stepped portion, a bearing fitting portion composed of a cylindrical outer peripheral surface, and a male screw portion. The bearing fitting portion is positioned outward in the axial direction of the pin 32 with respect to the stepped portion, and the male screw portion is positioned outward in the axial direction with respect to the bearing fitting portion.

  Each pin 32 is connected to the ring 31. Specifically, the pin 32 is fixed to the ring 31 by screwing the outer peripheral surface of the one end of the pin 32 to the inner peripheral surface of the through hole 39 of the ring 31. Further, the ball bearing 33 is externally fitted and fixed to the bearing fitting portion of the pin 21. The nut 34 is screwed into the male threaded portion at the other end of the pin 32 and the ball bearing 33 is pressed toward the stepped portion, thereby fixing the ball bearing 33 to the other end of the pin 32. ing.

  Each tapered roller 4 has a through hole 41. The through hole 41 extends along the axial center of the tapered roller 4. The pin 32 is inserted into the through hole 41 of the tapered roller 4. Each of the tapered rollers 4 is located between the ring 31 and the ball bearing 33 in the axial direction of the pin 32. The plurality of tapered rollers 4 are disposed between the raceway groove 11 of the outer ring 1 and the raceway groove 21 of the inner ring 2 at intervals in the circumferential direction while being held by the cage 3.

  FIG. 2 is a schematic view of the inner ring 2 and the cage 3 when the tapered roller bearing of the above-described embodiment is viewed from the outside in the axial direction on the side of the large collar portion 23 of the inner ring 21.

  In addition, illustration of the nut 34 is abbreviate | omitted in FIG.

  As shown in FIG. 2, the plurality of pins 32 are arranged at equal intervals in the circumferential direction of the inner ring 2. The outer peripheral surface 38 of the ball bearing 33 is in contact with the outer peripheral surface 27 of the inner ring 2. As shown in FIGS. 1 and 2, the outer peripheral surface 38 of the ball bearing 33 is guided by the outer peripheral surface of the large collar portion 23 of the inner ring 21.

  According to the tapered roller bearing of the above embodiment, the cage 3 fixes one end of the pin 32 to the through hole of the ring 31 and externally fits the ball bearing 33 to the outer peripheral surface of the other end of the pin 32. A plurality of ball bearings 33 that are light and inexpensive are arranged instead of a ring on one side of the cage 3 as compared with the corresponding pin cage. Since it is a structure, while reducing a tapered roller bearing, the manufacturing cost of a tapered roller bearing can be reduced. Further, when the tapered roller bearing is large like the tapered roller bearing for supporting the main shaft of the wind power generator, the tapered roller bearing can be remarkably reduced in weight, and the manufacturing cost of the tapered roller bearing can be significantly reduced.

  Further, according to the tapered roller bearing of the above embodiment, the outer peripheral surface 38 of the ball bearing 33 included in the retainer 3 is configured to be guided by the outer peripheral surface of the inner ring 2, so that the behavior of the retainer 3 is stabilized. be able to.

  In the tapered roller bearing of the above embodiment, the ring 31 and the pin 32 are fixed by screwing. In the present invention, the ring and the pin are fixed by press-fitting and welding. May be. In this case, the end of the cage pin opposite to the ring side is a configuration in which a ball bearing is fixed to the outer peripheral surface of the pin, and the end of the pin is positioned with respect to the axial center of the cage. Therefore, even after a cage assembly composed of a cage and rollers is constructed using welding, the end of the pin opposite to the ring side is distorted. Thus, the cage assembly can be incorporated into the inner ring. Therefore, in this case, spatter generated during welding does not contaminate the inner ring, and spatter does not adhere to the inner ring. Therefore, it is not necessary to remove spatter from the inner ring, thereby improving productivity. be able to.

  In the tapered roller bearing of the above embodiment, the ball bearing 33 is fixed to the pin 32 by using the step portion of the pin 32 and the nut 34. However, in the present invention, the outer peripheral surface of the rod-like portion is used without using the nut. In addition, the inner ring of the rolling bearing may be fixed by an interference fit, or may be fixed using a nut after an interference fit.

  Further, in the tapered roller bearing of the above embodiment, the ball bearing 33 is fixed to the end of the pin 32 opposite to the ring 31 side, but in this invention, the end of the pin opposite to the ring side is A rolling bearing other than a ball bearing such as a roller bearing may be externally fitted and fixed.

  Further, in the tapered roller bearing of the above embodiment, the inner ring of the rolling bearing (in this embodiment, the ball bearing 33) is fixed to the end of the pin 32 opposite to the ring 31 side. In the invention, the bearing attached to the rod-shaped portion may be configured such that the inner ring is not fixed to the rod-shaped portion.

  For example, in the present invention, the bearing attached to the outer peripheral surface of the end opposite to the ring side of the rod-shaped portion includes an inner ring contact member having a cylindrical portion and a plurality of rolling elements (for example, balls and rollers (cylinders). End of the inner ring contact member on the side opposite to the ring side and the inner circumferential surface of the cylindrical part of the inner ring contact member The structure arrange | positioned at intervals in the circumferential direction of a rod-shaped part may be sufficient. In this case, a part of the outer peripheral surface of the rod-shaped portion is used as a raceway surface, and the outer peripheral surface of the cylindrical portion of the inner ring contact member is guided by the outer peripheral surface of the inner ring of the roller bearing of the present invention. It goes without saying that it is done.

  In the present invention, the bearing attached to the outer peripheral surface of the end of the rod-like portion opposite to the ring side may not be a bearing having rolling elements, and may be, for example, a sliding bearing. Specifically, in the present invention, the bearing attached to the outer peripheral surface of the end opposite to the ring side of the rod-shaped portion has an annular member such as a bush having a cylindrical portion, and the inner peripheral surface of the annular member is The structure may be such that the annular member is attached to the outer peripheral surface of the end portion of the rod-shaped portion so as to face the outer peripheral surface of the end portion opposite to the ring side of the rod-shaped portion in the radial direction. And the structure which an inner peripheral surface of an annular member and the outer peripheral surface of the said edge part of the said rod-shaped part carry out sliding motion on both sides of an oil film may be sufficient. In this case, it goes without saying that the outer peripheral surface of the annular member is guided by the outer peripheral surface of the inner ring of the roller bearing of the present invention.

  Further, in the tapered roller bearing of the above embodiment, the ring portion and the rod-shaped portion are configured by fixing the pin 32 to the ring 31, but in the present invention, the ring portion and the rod-shaped portion are integrally formed by press molding. Also good.

  In the tapered roller bearing of the above embodiment, the ring 32 is disposed on the small diameter side of the conical raceway surface 21 of the inner ring 2 and the ball bearing 33 is disposed on the large diameter side of the conical raceway surface 21 of the inner ring 2. In this invention, the ring may be arranged on the large diameter side of the conical raceway surface of the inner ring, and the rolling bearing such as a ball bearing may be arranged on the small diameter side of the conical raceway surface of the inner ring.

  In the above embodiment, each of the inner and outer rings 1 and 2 has the conical raceway surfaces 11 and 21, and the roller is the tapered roller 4 having the through hole 41. In the present invention, each of the inner and outer rings is provided. However, it may be a cylindrical roller having a cylindrical raceway surface and the roller having a through hole extending along the axial center.

It is sectional drawing of the axial direction of the tapered roller bearing of one Embodiment of the roller bearing of this invention. It is a schematic diagram of an inner ring | wheel and a holder | retainer when the tapered roller bearing of the said embodiment is seen from the axial direction outward of the large collar part side of an inner ring | wheel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Cage 4 Tapered roller 11 Conical raceway surface 21 Conical raceway surface 23 Large collar part 27 Outer peripheral surface 31 Ring 32 Pin 33 Ball bearing 34 Nut 38 Outer peripheral surface of ball bearing 41 Through hole of tapered roller

Claims (1)

An outer ring having a raceway surface;
An inner ring having a raceway surface;
A plurality of rollers disposed between the raceway surface of the outer ring and the raceway surface of the inner ring;
A ring portion, a plurality of rod-shaped portions connected to the ring portion and spaced apart from each other in the circumferential direction of the ring portion, and an end portion of each rod-shaped portion opposite to the ring portion side A cage having a bearing attached to each of the outer peripheral surfaces,
Each of the above rollers has a through hole extending along the axial center of the roller,
The rod-shaped portion is inserted through the through hole of the roller,
A roller bearing, wherein an outer peripheral surface of the bearing is guided by an outer peripheral surface of the inner ring.

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