JP2018169011A - Conical roller bearing - Google Patents

Abstract

To provide a conical roller bearing in which a roller and a retainer assembly hardly drop out from an inner ring, furthermore, scratching due to physical interference hardly occurs duwing assembly with respect to the inner ring.SOLUTION: A conical roller bearing 11 includes a large flange part 13b protruding on a radial outside in a large diameter-side end part of an inner ring raceway surface 13a of an inner ring 13; and an extension raceway surface 13c having a contact angle of 35° or larger, extending on a small diameter side and installed on a small diameter side of the inner ring raceway surface 13a of the inner ring 13. A resin small flange member 13d is formed separately from the inner ring 13 and fitted into an outer diameter surface of the extension raceway surface 13c.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.

  As shown in FIG. 5, the tapered roller bearing of Patent Document 2 is provided with a small-diameter side protruding portion 3 c that protrudes in the axial direction on the small-diameter side of the inner ring.

  As shown in FIGS. 5 and 6, 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 at 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 punch 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. 7, the tapered roller 4 is assembled in the pocket P of the cage 10, and the roller / cage assembly 31 is assembled. Next, as shown in FIG. 8, the roller / retainer assembly 31 is assembled to the inner ring 3 to assemble the inner ring assembly 32 (see FIGS. 9A and 9B). 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. 5 and 6).

  However, in the case of the tapered roller bearing 1 having a steep slope with a contact angle α of 35 ° to 55 °, the inner ring assembly 32 is tilted during the assembly as shown by the white arrows in FIGS. 10 (a) and 10 (b). Since the inner ring raceway surface 3a has no edge on the small diameter side, 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.

  On the other hand, in the conventional tapered roller bearing in which a small flange is integrally provided on the small diameter side of the inner ring 3, there is a concern that when the roller / retainer assembly is assembled into the inner ring, scratches due to interference with the small ring are caused.

  Further, if the size of the gavel is reduced in order to prevent scratches due to interference with the gavel, it becomes difficult to process the inner ring raceway surface.

  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 to prevent scratches due to interference.

  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 the tapered roller bearing having a large collar portion protruding outward, a contact angle of 35 ° or more, and an extended raceway surface extending toward the small diameter side on the small diameter side of the inner ring raceway surface of the inner ring, the extended raceway A resin gavel member that is separate from the inner ring is fitted into the outer diameter surface of the surface.

  When the roller / cage assembly is assembled into the inner ring by inserting the resin / casket member into a ring-shaped heat shrink resin, the inner ring is inserted after the roller / cage assembly is inserted into the outer raceway surface of the inner ring. When the outer diameter surface of the extending raceway surface is covered with the ring of the resin gavel member before heat shrinkage, and then the ring-shaped resin gavel member is heat shrunk, The inner ring assembly can be assembled without interfering with the rollers.

  A thermoplastic shape memory resin can be used as the material of the resin gavel member.

  As described above, according to the present invention, when assembling the roller / cage assembly into the inner ring, after inserting the roller / cage assembly into the outer diameter of the extended raceway surface of the inner ring, the outer diameter of the extended raceway surface of the inner ring. By fitting the resin gavel member on the surface, the inner ring assembly can be assembled without interference between the resin gavel member constituting the gavel and the rollers.

  When the inner ring assembly in which the roller / cage assembly is assembled into the inner ring is fitted to the outer ring to assemble the tapered roller bearing, the tapered roller of the roller / cage assembly can be Since the end surface on the small diameter side is hooked on the plastic gavel member, it is possible to prevent the roller / cage assembly from falling 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 which shows the state which orient | assigned the inner ring assembly of the tapered roller bearing which concerns on this invention downward, (b) is an expanded partial cross section of the part enclosed with the dashed-two dotted line of (a) FIG. 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 3 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 flange 13 b that protrudes radially outward and holds the large-diameter end of the tapered roller 15.

  On the small diameter side of the inner ring raceway surface 13a of the inner ring 13, a stretched raceway surface 13c extending toward the small diameter side is provided, and on the outer diameter surface of the stretched raceway surface 13c, a ring-shaped resin small piece separated from the inner ring 13 is provided. The flange member 13d is fitted.

  This resin-made small collar member 13d is assembled with a roller / cage assembly 21 and an inner ring 13 by fitting a roller / cage assembly 21 (to be described later) to the inner ring 13 and then fitting it into the outer diameter surface of the extending raceway surface 13c. At the time of assembly, it is possible to eliminate interference between the resin gavel member 13d and the tapered roller 14, and to prevent scratches due to interference.

  As a material of the resin gavel member 13d, a thermoplastic shape memory resin such as polynorbornene, crosslinked trans polyisoprene, or crosslinked polyethylene can be used.

  The thickness of the resin small collar member 13d is about 0.1 to 1 mm, as long as the roller and cage assembly 21 can be held so as not to fall off the inner ring 13 when the tapered roller bearing 11 described later is assembled. It only needs to be thick.

That is, as shown in FIG. 3B, the outer diameter surface of the resin small collar member 13d is formed in a plane parallel to the axis of the inner ring 13, and the outer diameter D ₁ is equal to the roller inner diameter. is set larger than the circle diameter D _2, rollers difference between the outer diameter D ₁ of the inscribed circle diameter D ₂ and the resin small rib member 13d may if about 0.1 to 1 mm.

  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, after the roller / cage assembly 21 is inserted into the outer diameter of the extending raceway surface 13c of the inner ring 13, a ring-shaped resin small collar member 13d before contraction is formed on the outer diameter surface of the extending raceway surface 13c of the inner ring 13. Then, the resin gavel member 13d is heat-shrinked, and as shown in FIGS. 3A and 3B, the resin gavel member 13d is fitted and fixed to the outer diameter surface of the extending raceway surface 13c of the inner ring 13. As a result, the inner ring assembly 22 is assembled.

  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).

When the inner ring assembly 22 and the outer ring 12 are assembled, as shown in FIGS. 4 (a) and 4 (b), even if the inner ring assembly 22 is tilted to the small diameter side, As shown in FIG. 3B, the outer diameter D ₁ is set larger than the roller inscribed circle diameter D _{2 of} the roller / cage assembly 21, so that the tapered roller 14 of the roller / cage assembly 21 The end surface on the small diameter side is caught by the resin-made small scissors member 13d, and the roller / cage assembly 21 can be prevented from falling off from the inner ring 13.

  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: Bearing 12: Outer ring 12a: Outer ring raceway surface 13: Inner ring 13a: Inner ring raceway surface 13b: Large collar part 13c: Stretched raceway surface 13d: Resin small collar member 20: Cage 20a: Large diameter ring part 20b: Small diameter ring Portion 21: Cage assembly 22: Inner ring assembly 31: Cage assembly 32: Inner ring assembly P: Pocket

Claims (3)

  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 a tapered roller bearing having an angle of 35 ° or more and an extended raceway surface extending toward the small diameter side on the small diameter side of the inner ring raceway surface of the inner ring, a resin separate from the inner ring on the outer diameter surface of the extended raceway surface Tapered roller bearings characterized by fitting a small iron member.   The tapered roller bearing according to claim 1, wherein the resin gavel member is made of a ring-shaped heat shrink resin.   The tapered roller bearing according to claim 2, wherein the heat shrinkable resin is a thermoplastic shape memory resin.

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