JP2017180481A - Conical roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize an attitude of a roller/cage assembly in respect to an inner ring during assembly work, prevent the roller/cage assembly from being dropped from the inner ring and prevent poor lubrication from being generated when they are used under lubrication of grease.SOLUTION: This invention relates to a conical roller bearing 11 in which a large diameter side end part of an inner ring raceway surface 13a of an inner ring 13 has a large flange part 13b protruded outside in a radial direction and a contact angle is 35° or more. A small diameter side of the inner ring raceway surface 13a of the inner ring 13 is provided with an extended raceway surface 13c extending to a small diameter side. An end part of a small diameter side of this extended raceway surface 13c is provided with a small-diameter side flange part 13e that is protruded out in a radial direction in respect to the extended raceway surface 13c, an outer diameter Dof which is smaller than an inscription circle Dof the conical roller 14 and where a groove part 13d is provided between it and the small diameter side end surface of the conical roller 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tapered roller bearing used in a reduction gear of a robot or a construction machine, particularly a taper used for an application requiring high load capacity, high rigidity and compactness under a condition where a high moment load is applied. The present invention relates to a roller bearing.

  Tapered roller bearings used in applications that require this type of high load capacity, high rigidity, and compactness. Out of the large diameter side end and the small diameter side end of the inner ring, only the large diameter side end is radially outward. Patent Document 1, Patent Document 2, Patent Document 1 are provided with a flange portion protruding in the direction, eliminating the small flange on the small diameter side end portion of the inner ring, and increasing the roller length by the amount of the small flange to increase the load capacity. It is disclosed in Document 3.

  The tapered roller bearings of Patent Document 1 and Patent Document 2 are provided with a small-diameter side protruding portion 3c that protrudes in the axial direction on the small-diameter side of the inner ring.

  As shown in FIGS. 10 and 11, the tapered roller bearing 1 disclosed in Patent Document 2 or Patent Document 3 has an outer ring 2 having an outer ring raceway surface 2a on an inner peripheral surface and an inner ring raceway surface 3a on an outer peripheral surface. Inner ring 3, a plurality of tapered rollers 4 that are rotatably arranged between outer ring raceway surface 2a and inner ring raceway surface 3a, and a plurality of pockets that accommodate and hold the plurality of tapered rollers 4 at predetermined intervals. A cage 10 having P is provided, and a large collar portion 3b that protrudes radially outward is provided only at the large-diameter side end portion of the large-diameter side end portion and the small-diameter side end portion of the inner ring 3, The small brim of the end portion on the small diameter side is eliminated, and the length of the tapered roller 4 is increased by the amount of the small brim to increase the load capacity.

  Further, the contact angle α is set to a steep slope of 35 ° to 55 ° so as to obtain high moment rigidity.

JP 2007-32679 A JP-A-2006-8641 International Publication Number WO2014 / 104132

  Incidentally, the tapered roller bearing is assembled in the following procedure.

  First, as shown in FIG. 12, the tapered roller 4 is assembled in the pocket P of the cage 10 to assemble the roller / cage assembly 31. Next, as shown in FIG. 13, the roller and cage assembly 31 is assembled to the inner ring 3 to assemble the inner ring assembly 32 (see FIGS. 14A and 14B). Thereafter, the inner ring assembly 32 is inserted into the inner periphery of the outer ring 2 to complete the assembly of the tapered roller bearing 1 (see FIGS. 10 and 11).

  However, in the case of the tapered roller bearing 1 having a steep contact angle α of 35 ° to 55 °, the inner ring assembly 31 is tilted during assembly as shown by the white arrows in FIGS. 15 (a) and 15 (b). Since there is no small brim at the small diameter side end of the inner ring raceway surface 3a, the roller / cage assembly 31 tends to shift to the small diameter side of the inner ring 3, and the posture of the roller / cage assembly 31 with respect to the inner ring 3 is not stable, There is a problem in that the roller / cage assembly 31 drops off from the inner ring 3 and it takes time to assemble the outer ring 2 into the inner periphery.

  Further, when the tapered roller bearing 1 having no wrinkles on the small diameter side of the inner ring 3 is used for grease lubrication, there is no grease accumulation on the small diameter side, so that lubrication failure is likely to occur.

  Therefore, according to the present invention, in the tapered roller bearing having a high contact angle of 35 ° or more, the posture of the roller / retainer assembly is stabilized with respect to the inner ring during assembly, and the roller / retainer assembly is It is difficult to drop off from the inner ring and, when used in grease lubrication, it is difficult to cause poor lubrication.

  In order to solve the above problems, the present invention provides an outer ring having an outer ring raceway surface on an inner peripheral surface, an inner ring having an inner ring raceway surface on an outer peripheral surface, and an outer ring raceway surface between the outer ring raceway surface and the inner ring raceway surface. A plurality of tapered rollers arranged in a movable manner and a cage having a plurality of pockets for accommodating and holding the plurality of tapered rollers at a predetermined interval, and radially arranged on the large-diameter end of the inner ring raceway surface of the inner ring In a tapered roller bearing having a large flange portion protruding outward and having a contact angle of 35 ° or more, an extending raceway surface extending toward the small diameter side is provided on the small diameter side of the inner ring raceway surface of the inner ring. A small-diameter collar that protrudes radially outward with respect to the extending raceway surface at the small-diameter end of the surface, has an outer diameter smaller than the inscribed circle diameter of the roller, and has a groove between the small-diameter side end surface of the tapered roller Is provided.

  The width of the groove is 10 to 60% of the end face diameter on the small diameter side of the tapered roller.

  The width of the groove is larger than the chamfer width of the tapered roller.

An angle a formed by the outer diameter surface of the small-diameter side collar portion and the inner surface of the groove portion facing the end surface on the small-diameter side of the tapered roller is set to 30 to 90 °.
The cage is made of resin, and a plurality of claw portions are provided on the inner diameter surface of the resin cage on the small diameter side, and the inner diameter of the claw portion is set smaller than the outer diameter of the small diameter side collar portion.

As described above, according to the present invention, a tapered roller is assembled into a cage pocket to form a roller / cage assembly, and then an inner ring assembly in which the roller / cage assembly is assembled to an inner ring, When assembling a tapered roller bearing by fitting it to the outer ring, if the inner ring assembly is tilted to the smaller diameter side, the roller / cage assembly moves on the extended raceway surface of the inner ring raceway surface. Since the inner diameter surface of the large-diameter ring portion of the cage contacts the outer diameter surface of the large collar portion of the inner ring and is supported with respect to the inner ring, it is prevented from falling off from the inner ring. After that, even if the roller / cage assembly further moves on the extended raceway surface of the inner ring raceway surface, the roller / cage assembly will still have the inner diameter surface of the smaller diameter ring part of the cage and the outer diameter of the smaller diameter side collar part of the inner ring. 1st support point between the surface, 2nd support point between the small diameter side end surface of the tapered roller and the groove portion of the small diameter side collar, between the large collar portion of the inner ring and the end surface of the large diameter ring portion of the cage The third support point is switched to support by the three support points, and the impact caused by the collision between the roller / retainer assembly and the inner ring during movement is relieved, and the high retainability of the roller / retainer assembly to the inner ring 13 is reduced. As a result, it becomes difficult for the roller / cage assembly to fall off the inner ring.

(A) is sectional drawing which cut | disconnected the tapered roller bearing of this invention by the pillar part of a holder | retainer, (b) is an expanded partial sectional view of the part enclosed with the dashed-two dotted line of (a). It is a perspective view of the roller and cage assembly before assembling the tapered roller bearing according to the present invention. (A) is sectional drawing which cut | disconnected the inner ring | wheel assembly before the assembly of the tapered roller bearing which concerns on this invention with the pillar part of the cage | basket, (b) is the enlarged part of the part enclosed with the dashed-two dotted line of (a) It is sectional drawing. (A) is sectional drawing which shows the state immediately after inclining the inner ring assembly of the tapered roller bearing which concerns on this invention, (b) is an expanded partial cross section of the part enclosed with the dashed-two dotted line of (a) FIG. (A) is sectional drawing which shows the state after the inner ring assembly of the tapered roller bearing which concerns on this invention moved on the extending | stretching raceway surface of an inner ring raceway surface, (b) is enclosed with the dashed-two dotted line of (a). FIG. It is an expanded sectional view showing the state where the inner ring assembly of the tapered roller bearing concerning a 1st embodiment of this invention turned to the bottom. It is the expanded partial sectional view which cut | disconnected the tapered roller bearing which concerns on 2nd Embodiment of this invention by the pillar part of the holder | retainer. It is an expanded sectional view which shows the state which orient | assigned the inner ring assembly of the tapered roller bearing which concerns on 2nd Embodiment of this invention downward. It is an expanded sectional view showing the state where the roller and cage assembly of a tapered roller bearing concerning a 2nd embodiment of this invention is built in an inner ring. It is the expanded sectional view which cut | disconnected the roller and holder | retainer assembly of the tapered roller bearing of patent document 2 with the pillar part of the holder | retainer. It is the expanded sectional view which cut | disconnected the roller and holder | retainer assembly of the tapered roller bearing of patent document 2 with the pillar part of the holder | retainer. It is a perspective view of the roller and cage assembly before the assembly of the tapered roller bearing of Patent Document 2. It is sectional drawing which shows the state which incorporates the roller and holder assembly of the tapered roller bearing of patent document 2 in an inner ring. (A) is sectional drawing which cut | disconnected the inner ring assembly before the assembly of the tapered roller bearing which concerns on patent document 2 with the pillar part of the holder | retainer, (b) is an expansion of the part enclosed with the dashed-two dotted line of (a). It is a fragmentary sectional view. (A) is sectional drawing which shows the state which the inner ring assembly of the tapered roller bearing which concerns on patent document 2 moves on an inner ring raceway surface, (b) is an enlarged part of the part enclosed with the dashed-two dotted line of (a) It is sectional drawing.

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

  The tapered roller bearing 11 according to the present invention has a steep contact angle α of 35 ° or more, and the tapered roller bearing 11 of the embodiment shown in FIGS. 1A and 1B has a contact angle α of 45 °. is there.

  The tapered roller bearing 11 according to the present invention includes an outer ring 12 having an outer ring raceway surface 12a on an inner peripheral surface, an inner ring 13 having an inner ring raceway surface 13a on an outer peripheral surface, and the outer ring raceway surface 12a and the inner ring raceway surface 13a. There are provided a plurality of tapered rollers 14 disposed so as to be able to roll between, and a cage 20 having a plurality of pockets P for accommodating and holding the plurality of tapered rollers 14 at a predetermined interval. The cage 20 has a large-diameter ring portion 20 a on the large-diameter side and a small-diameter ring portion 20 b on the small-diameter side, and the inner diameter surfaces of the large-diameter ring portion 20 a and the small-diameter ring portion 20 b are parallel to the axis of the inner ring 13. Formed on the surface.

  A large-diameter end of the inner ring 13 has a large brim 13 b that protrudes radially outward and holds the large-diameter end of the tapered roller 15.

  On the smaller diameter side of the inner ring raceway surface 13 of the inner ring 13, there is provided an elongated raceway surface 13c extending toward the smaller diameter side, and radially outward with respect to the elongated raceway surface 13c at the small diameter side end of the elongated raceway surface 13c. And a small-diameter collar portion 13e facing the small-diameter side end surface of the tapered roller 14 via a groove portion 13d (a thin ink portion in FIGS. 1 and 3B).

Outer diameter surface of the small-diameter-side flange portion 13e, as shown in FIG. 3 (b), are formed on the parallel surface to the axis of the inner ring 13, an outer diameter D ₁ is roller inscribed circle diameter D It is set smaller than ₂ .

  The tapered roller bearing 11 of the present invention is assembled in the following procedure.

  First, as shown in FIG. 2, the tapered roller 14 is assembled in the pocket P of the cage 20, and the roller / cage assembly 21 is assembled. Next, as shown in FIGS. 3 (a) and 3 (b), the roller / retainer assembly 21 is assembled to the inner ring 13 to assemble the inner ring assembly 22. Thereafter, the inner ring assembly 22 is inserted into the inner periphery of the outer ring 12 to complete the assembly of the tapered roller bearing 11 (see FIGS. 1A and 1B).

  4 (a) and 4 (b), when the inner ring assembly 22 is tilted to the smaller diameter side, the roller / retainer assembly 21 moves on the extended raceway surface 13c of the inner ring raceway surface 13 as shown in FIGS. . Immediately after the start of movement, as shown in FIGS. 4A and 4B, the roller / retainer assembly 21 has an inner diameter surface of the large-diameter ring portion 20a of the retainer 20 and an outer diameter of the large collar portion 13b of the inner ring 13. It comes into contact with the surface and is supported with respect to the inner ring 13 and is prevented from falling off from the inner ring 13.

  Thereafter, when the roller / cage assembly 21 further moves on the extended raceway surface 13 c of the inner ring raceway surface 13, the roller / cage assembly 21 is moved to the retainer 20 as shown in FIGS. Between the inner diameter surface of the small diameter ring portion 20b and the outer diameter surface of the small diameter side collar portion 13e of the inner ring 13, between the small diameter side end surface of the tapered roller 14 and the groove portion 13d of the small diameter side collar portion 13e. The second support point C2 is switched to support by the three support points of the third support point C3 between the large collar portion 13b of the inner ring 13 and the end surface of the cage 20 large-diameter ring portion 20a. Thereby, when the roller / cage assembly 21 moves on the extended raceway surface 13 c of the inner ring raceway surface 13, the impact caused by the collision between the tapered roller 14 and the inner ring 13 is alleviated. High retainability with respect to the inner ring 13 is obtained, and the roller / cage assembly 21 is difficult to drop off from the inner ring 13.

  An angle a between the outer diameter surface of the small-diameter side collar portion 13e and the end surface of the groove portion 13d is set in a range of 30 to 90 °. In particular, when the angle a is 45 to 75 °, the contact area between the small-diameter side end surface of the tapered roller 14 and the end surface of the groove portion 13d is increased, and high retainability of the tapered roller 14 is obtained. When the angle a is less than 30 °, point contact is made in the vicinity of the chamfer of the tapered roller 14, so that the retainability of the tapered roller 14 is lowered, and there is a fear of dropping off. On the other hand, when the angle a is larger than 90 °, the end surface on the small diameter side of the tapered roller 14 and the end surface of the groove portion 13d are almost in point contact, and the end surface of the tapered roller 14 is damaged or the workability of the groove portion 13d is deteriorated.

  Further, the length of the end face A of the groove 13d is in the range of 10 to 60% of the end face diameter on the small diameter side of the tapered roller 14, so that the small diameter side end face of the tapered roller 14 and the groove 13d of the small diameter side collar 13e The second support point C <b> 2 between the two is in surface contact, the posture of the roller / cage assembly 21 is stabilized, and high holding ability with respect to the inner ring 13 is obtained. If it is less than 10%, the posture of the roller / cage assembly 21 is not stable and may fall off. If it is larger than 60%, the angle at the bottom of the groove becomes an acute angle, and there is a concern that the strength is reduced due to damage due to stress concentration or insufficient thickness.

  The groove width B of the groove portion 13d is larger than the chamfer width of the tapered roller 14. The reason is that when the width is smaller than the chamfer width, the roller will drop off with almost no catching margin with the inner ring.

  Since the groove portion 13d (the thin ink portion in FIGS. 1B and 3B) is provided at the small-diameter side end portion of the extending raceway surface 13c of the inner ring 13, the groove portion 13d becomes a grease reservoir, and the raceway surface has a small diameter. The lack of lubrication on the side is reduced.

In the above embodiment, the outer diameter surface of the small-diameter-side flange portion 13e of the inner ring 13, as shown in FIG. 3 (b), are formed on the parallel surface to the axis of the inner ring 13, an outer diameter D ₁ It is set smaller than the roller inscribed circle diameter D _2.

  Therefore, as shown in FIG. 6, when the inner ring assembly 22 is leveled so that the small diameter side is downward, the roller / cage assembly 21 is separated from the inner ring 13 in the direction of the white arrow.

  7 to 9 show a second embodiment of the present invention in which the roller / retainer assembly 21 is not separated from the inner ring 13 even when the inner ring assembly 22 is leveled so that the small diameter side is down. ing.

As shown in FIG. 7, the tapered roller bearing 11 of the second embodiment has an inner diameter dimension smaller than the outer diameter D ₁ of the small-diameter side collar portion 13e of the inner ring 13 on the inner diameter surface of the small-diameter ring portion 20b of the cage 20. D ₃ are provided two locations or more small claw portion 20c. It is preferable that the positions of the claw portions 20c on the circumference are even.

The inner diameter surface of the small-diameter ring portion 20b of the retainer 20 are provided as the inner diameter D ₃ smaller claw portion 20c 2 or more places than the outer diameter D ₁ of the small diameter side flange portion 13e of the inner ring 13, as shown in FIG. 8 Even if the inner ring assembly 22 is leveled so that the small diameter side is downward, the tip of the claw portion 20c is caught by the small diameter side collar portion 13e of the inner ring 13, so that the roller / cage assembly 21 is not separated from the inner ring 13. .

In the second embodiment, since the claw portion 20c is the inner diameter dimension D ₃ also smaller than the outer diameter D ₁ of the small diameter side flange portion 13e of the inner ring 13 is provided in the retainer 20, the roller-cage assembly 21 When assembled in the inner ring 13, the elasticity of the resin cage 20 is used so that the claw portion 20c is inserted into the small-diameter side collar portion 13e of the inner ring 13, as shown in FIG.

  The roller / cage assembly 21 can be assembled by using the elasticity of the resin cage 20 and inserting the claw portion 20c into the small-diameter side collar portion 13e of the inner ring 13, so that the conical portion is conical. It is possible to prevent the roller 14 from being wrinkled.

  In this way, when the cage 20 having the claw portion 20c on the inner diameter surface of the small-diameter ring portion 20b is used, even if the inner ring assembly 22 is directed downward, as shown in FIG. If the retainer 20 having no claw portion 20c on the inner diameter surface of the small diameter ring portion 20b is used, the inner ring 13 can be seen when the inner ring assembly 22 is turned downward as shown in FIG. However, the cage assembly 21 is separated. Therefore, by simply changing the cage 20, the inner ring 13 and the cage assembly 21 can be easily changed between the separated type and the non-separated type. A good type can be selected.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. The scope of the present invention is claimed. The equivalent meanings recited in the claims, and all modifications within the scope.

DESCRIPTION OF SYMBOLS 11: Tapered roller bearing 12: Outer ring 12a: Outer ring raceway surface 13: Inner ring 13a: Inner ring raceway surface 13b: Large collar part 13c: Stretching raceway surface 13d: Groove part 13e: Small diameter side collar part 20: Cage 20a: Large diameter ring part 20b: Small diameter ring portion 21: Roller / retainer assembly 22: Inner ring assembly P: Pocket

Claims (5)

  An outer ring having an outer ring raceway surface on an inner peripheral surface, an inner ring having an inner ring raceway surface on an outer peripheral surface, and a plurality of tapered rollers arranged to be freely rollable between the outer ring raceway surface and the inner ring raceway surface, A cage having a plurality of pockets for accommodating and holding a plurality of tapered rollers at a predetermined interval, and having a large brim portion protruding radially outward at the end of the inner ring raceway surface of the inner ring, and contacting In the tapered roller bearing having an angle of 35 ° or more, an extending raceway surface extending toward the small diameter side is provided on the small diameter side of the inner ring raceway surface of the inner ring, and an end of the extended raceway surface on the small diameter side with respect to the stretched raceway surface is provided. A tapered roller bearing characterized in that it projects radially outward, has an outer diameter smaller than the inscribed circle diameter of the roller, and has a small-diameter flange having a groove with the small-diameter end surface of the tapered roller.   The tapered roller bearing according to claim 1, wherein the groove width is 10 to 60% of an end face diameter on the small diameter side of the tapered roller.   The tapered roller bearing according to claim 1, wherein the groove width is larger than a chamfer width of the tapered roller.   The cone according to any one of claims 1 to 3, wherein an angle a formed by an outer diameter surface of the small-diameter side collar portion and an inner surface of the groove facing an end surface on the small-diameter side of the tapered roller is 30 to 90 °. Roller bearing.   The retainer is made of resin, a plurality of claw portions are provided on an inner diameter surface of the smaller diameter side of the cage, and the inner diameter of the claw portion is smaller than the outer diameter of the small diameter side collar portion. The tapered roller bearing according to any one of 4.

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