JP2020159486A - Conical roller bearing - Google Patents

Abstract

To prevent damage of a hook member of a pulling jig in a case of pulling out an inner ring of a conical roller bearing externally fitted to a shaft.SOLUTION: A conical roller bearing comprises a holder 17 having a plurality of pockets for accommodating and holding conical rollers 16 of a conical roller train at predetermined intervals. The holder 17 has a small diameter ring part 17b on a small diameter side. Between the inner peripheral surface of the small diameter ring part 17b and the outer peripheral surface of a small flange part 15c of an inner ring 15, an insertion space 18 for inserting a hook member 21 of a pulling jig 20 is provided. A wide part 19 is provided in a part of the insertion space 18 in a circumferential direction, and the wide part 19 enables the insertion of a thick hook member 21.SELECTED DRAWING: Figure 7

Description

According to the present invention, a tapered roller having a structure in which the hook member of the pulling jig is not easily damaged when the hook member of the pulling jig is hooked on the small flange of the inner ring and the tapered roller bearing fitted on the shaft is pulled out. Regarding roller bearings.

Conventionally, as a method of pulling out a bearing externally fitted to the shaft from the shaft, a method using hydraulic pressure and a method using a pulling jig are known (Patent Document 1, Patent Document).

Japanese Unexamined Patent Publication No. 10-339325 Japanese Unexamined Patent Publication No. 2016-48104

By the way, conventionally, as a method of pulling out the inner ring of the tapered roller bearing outerly fitted to the shaft, as shown in FIGS. 13 to 16, the hook member 21 of the pulling jig 20 is attached to the small flange portion 1a of the inner ring 1. There is a method of hooking and pulling out.

In this method, first, as shown in FIG. 13, the tip of the hook member 21 of the pulling jig 20 is placed between the inner peripheral surface of the cage 2 on the small diameter side and the outer peripheral surface of the small flange portion 1a of the inner ring 1. It is inserted into the tapered roller bearing from the insertion space 3 of the above, and is hooked on the small flange portion 1a of the inner ring 1 as shown in FIG.

Then, with the tip of the hook member 21 of the pulling jig 20 hooked on the small flange portion 1a of the inner ring 1, as shown in FIG. 15, the pulling jig 20 is pulled toward the small diameter side to the shaft 4. The inner ring 1 of the externally fitted tapered roller bearing is pulled out.

As shown in FIG. 16, the hook member 21 of the pulling jig 20 is inserted between the small diameter side end faces of the adjacent tapered rollers 5, but the thickness of the hook member 21 of the pulling jig 20 is the cage. It cannot be inserted into the tapered roller bearing unless it is smaller than the insertion space 3 between the inner peripheral surface on the small diameter side of 2 and the outer peripheral surface of the small flange portion 1a of the inner ring 1.

Therefore, if the insertion space 3 between the inner peripheral surface on the small diameter side of the cage 2 and the outer peripheral surface of the small flange portion 1a of the inner ring 1 is narrow, the thickness of the hook member 21 of the pulling jig 20 is reduced. There is a problem that the neck portion of the hook member 21 is damaged when it is pulled out.

Therefore, according to the present invention, even if the hook member of the pulling jig is thick, it can be inserted into the tapered roller bearing, and when pulling out the inner ring of the tapered roller bearing fitted on the shaft, the pulling jig is used. The subject is to prevent the jig member of the bearing from being damaged.

In order to solve the above-mentioned problems, the present invention has an outer ring having an outer ring raceway surface on the inner peripheral surface and an outer ring on which the axle box is mounted on the outer peripheral surface, and an inner ring raceway surface on the outer peripheral surface and the inner peripheral surface. An inner ring on which a shaft is mounted, a row of tapered rollers rotatably arranged between the outer ring raceway surface and the inner ring raceway surface, and a plurality of tapered rollers of the tapered roller row are accommodated and held at predetermined intervals. A cage having a pocket is provided, and the cage has a large diameter ring portion on the large diameter side and a small diameter ring portion on the small diameter side, and the inner peripheral surface of the small diameter ring portion and the outer circumference of the small flange portion of the inner ring. A tapered roller bearing provided with an insertion space for inserting a hook member of a pulling jig between the surface and the surface is characterized in that a wide portion is provided in a part of the insertion space in the circumferential direction.

The wide portion is provided with a recess recessed on the outer diameter side on the inner peripheral surface of the small diameter ring portion of the cage.
It can be formed by providing a recess recessed on the inner diameter side on the outer peripheral surface of the small collar portion of the inner ring.

As described above, according to the present invention, since a wide portion is provided in a part of the insertion space in which the hook member of the pulling jig is inserted in the circumferential direction, the thickness of the hook member is increased according to the wide portion. can do.

Therefore, the hook member is not easily damaged when the inner ring of the tapered roller bearing fitted to the shaft is pulled out.

It is sectional drawing of the tapered roller bearing which concerns on 1st Embodiment of this invention. It is a side view which looked at the inner ring and the cage of the tapered roller bearing which concerns on embodiment of FIG. 1 from the small diameter side. It is a partially enlarged view of FIG. It is a schematic diagram of the cage which shows an example of the arrangement state of the column part of a wide width. It is a schematic diagram of the cage which shows the example which used the pillar part of the width wider than FIG. It is a schematic diagram which shows the limit of the width interval of a wide pillar part. It is sectional drawing of the state in which the hook member of a pulling jig is inserted into a tapered roller bearing from a wide part. FIG. 7 is a partial side view of the inner ring of the tapered roller bearing and the cage in FIG. 7 as viewed from the small diameter side. It is sectional drawing which shows the state which the hook member of the pulling jig is hooked on the small flange part of the inner ring of a tapered roller bearing, and is pulled out. It is sectional drawing which shows the relationship between the inner ring of the tapered roller bearing which concerns on 2nd Embodiment of this invention, and the hook member of a pulling out jig. It is a side view which looked at the inner ring and the cage of the tapered roller bearing which concerns on embodiment of FIG. 10 from the small diameter side. FIG. 5 is a cross-sectional view showing a state in which a hook member of a pulling jig is hooked on a small flange portion of an inner ring of a tapered roller bearing according to the embodiment of FIG. 10 and pulled out. It is sectional drawing which shows the relationship between the inner ring of the conventional tapered roller bearing, and the hook member of a pulling jig. FIG. 3 is a cross-sectional view showing a state in which a hook member of a pulling jig is hooked on a small flange portion of an inner ring of a tapered roller bearing of FIG. FIG. 3 is a cross-sectional view showing a state in which a hook member of a pulling jig is hooked on a small flange portion of an inner ring of the tapered roller bearing of FIG. 13 and pulled out. It is a partial side view of the inner ring and the cage of the tapered roller bearing of FIG. 13 seen from the small diameter side.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the tapered roller bearing 11 according to the present invention has an outer ring raceway surface 13a on the inner peripheral surface, an outer ring 13 on which the axle box 12 is mounted on the outer peripheral surface, and a shaft 14 on the inner peripheral surface. A cage 17 having a plurality of pockets for accommodating and holding the tapered inner ring 15 to be fitted, the tapered roller array rotatably arranged between the outer ring 13 and the inner ring 15, and the tapered roller 16 of the tapered roller array at predetermined intervals. And.

The inner ring 15 has an inner ring raceway surface 15a on the outer peripheral surface, and has a large flange portion 15b at the large-diameter side end portion that projects outward in the radial direction and holds the large-diameter side end surface of the cone 16. A small collar portion 15c protruding in the axial direction is provided on the small diameter side of the inner ring raceway surface 15a.

The cage 17 has a large diameter ring portion 17a on the large diameter side, a small diameter ring portion 17b on the small diameter side, and a pillar portion 17c connecting the large diameter ring portion 17a and the small diameter ring portion 17b at predetermined intervals.

An insertion space 18 for inserting the hook member 21 of the pulling jig 20 is provided between the inner peripheral surface of the small diameter ring portion 17b of the cage 17 and the outer peripheral surface of the small flange portion 15c of the inner ring 15. Wide portions 19 are provided at several locations in the circumferential direction of the insertion space. The wide portion 19 is formed by a recessed portion in which the inner peripheral surface of the small diameter ring portion 17b is recessed toward the outer diameter side.

As shown in FIG. 2, the recessed portion forming the wide portion 19 is located between the adjacent tapered rollers 16 and is uniformly provided in the circumferential direction of the tapered roller rows. In the embodiment shown in FIG. 2, three recessed portions forming the wide portion 19 are evenly provided in the circumferential direction. In the embodiment shown in FIG. 2, since the number of rollers is 32 and cannot be divided by 3, the number of rollers is distributed to 11, 11, and 10 so that the number of rollers is as close to equal distribution as possible.

Further, when a recessed portion forming the wide portion 19 is formed on the inner peripheral surface of the small diameter ring portion 17b of the cage 17, the recessed portion becomes thinner than the other portions, so that the strength of the recessed portion is reduced. In order to prevent this, as shown in FIG. 3, the width W1 of the pillar portion 17c forming the recessed portion is formed wider than the width W2 of the pillar portion 17c of the other portion.

How much the wide pillar portion 17c having the width W1 is wider than the narrow pillar portion 17c having the width W2 may be determined based on the following criteria.

For example, FIGS. 4 and 5 show a cage 17 having 14 rollers and having three wide W1 pillars 17c arranged as evenly as possible in the circumferential direction. The mark indicates a pillar portion 17c having a wide width W1 and ▲ indicates a pillar portion 17c having a narrow width W2.

In the example of FIG. 4, the central angle of the column portion 17c of the wide width W1 is 13 ° 27', and the central angle of the column portion 17c of the narrow width W2 is 12 ° 27'. 17c is a schematic view arranged in the circumferential direction, and is an example in which the difference α between the central angle of the pillar portion 17c of the wide width W1 and the central angle of the pillar portion 17c of the narrow width W2 is set to 1 °.

Further, in the example of FIG. 5, the central angle of the pillar portion 17c of the wide width W1 is 15 ° 0', and the central angle of the pillar portion 17c of the narrow width W2 is 12 ° 0'. It is a schematic diagram in which the pillars 17c are arranged in the circumferential direction, and is an example in which the difference α between the central angle of the pillar 17c having a wide width W1 and the central angle of the pillar 17c having a narrow width W2 is 3 °.

The column width of the column portion 17c of the wide width W1 is T, the column width of the column portion 17c of the narrow width W2 is t, the number of the column portion 17c and the conical rollers 16 is Z, and the roller diameter (corresponding to the roller length in the circumferential direction) is Dw. If the roller PCD is d, the column width is obtained by dividing the circumference length by the number of rollers and subtracting the roller diameter.
That is, t = πd / Z-Dw
Is.
Therefore, Tt = α.
Comparing the example of FIG. 4 and the example of FIG. 5, the balance is better when α is 1 ° than when α is 3 °.

When the limit of Tt = α, that is, the column width of the column portion 17c of the wide width W1 is T and the column width of 17c of the narrow width W2 is t, the column width T is wide as shown in FIG. Therefore, it is desirable not to be in a state where one tapered roller 16 is insufficient. The state in which one tapered roller 16 is insufficient is not from the viewpoint of load capacity, but when considering that the number of rollers is the number required for the bearing to roll, the tapered roller 16 should be present. It means that there is no tapered roller 16 in the place.

Therefore, the column width T of the column portion 17c of the wide width W1 and Tt = α are
T <t + Dw,
α <Dw
It is desirable to satisfy the relationship of.

Since wide portions 19 are provided in several places in the circumferential direction of the insertion space 18 into which the hook member 21 of the pull-out jig 20 is inserted, the hook member 21 of the pull-out jig 20 is thickened from the wide portion 19. However, as shown in FIGS. 4 and 5, the hook member 21 can be inserted into the tapered roller bearing 11 and the hook member 21 can be hooked on the small collar portion 15c of the inner ring 15.

Then, the hook member 21 arranged in the circumferential direction is bolted to the disk-shaped pulling jig 20, and then the pulling jig 20 is pulled toward the small diameter side as shown in FIG. The inner ring 15 of the tapered roller bearing 11 fitted to the outer surface 14 can be pulled out.

Since the hook member 21 is inserted into the tapered roller bearing 11 from the wide portion 19 in this way, a member thicker than the conventional hook member 21 can be used. Therefore, it is possible to prevent damage to the hook member 21 when the inner ring 15 of the tapered roller bearing 11 fitted to the shaft 14 is pulled out.

Next, FIGS. 7 to 9 show a second embodiment of the present invention. In this second embodiment, recesses are formed at several points in the circumferential direction of the outer peripheral surface of the small collar portion 15c of the inner ring 15, and wide portions 19 are provided. As shown in FIG. 9, the hook members 21 of the pulling jig 20 are inserted into the tapered roller bearings 11 from the wide portions 19 provided at several places in the circumferential direction, and the hook members 21 are inserted into the small flange portions 15c of the inner ring 15. After hooking, the hook member 21 arranged in the circumferential direction is bolted to the disk-shaped pulling jig 20 and the pulling jig 20 is pulled toward the small diameter side, and the tapered roller fitted on the shaft 14 is externally fitted. The inner ring 15 of the bearing can be pulled out.

Also in this second embodiment, since the hook member 21 of the pulling jig 20 can be inserted into the tapered roller bearing 11 from the wide portion 19, the thickness of the hook member 21 is made thicker than that of the conventional one. It is possible to prevent damage to the hook member 21.

The present invention is not limited to the above-described embodiments, and it is needless to say that the present invention can be implemented in various forms without departing from the gist of the present invention, and the scope of the present invention is claimed. Indicated by the scope of, and further include the equal meaning described in the claims, and all modifications within the scope.

11: Bearing 12: Shaft box 13: Outer ring 13a: Outer ring raceway surface 14: Shaft 15: Inner ring 15a: Inner ring raceway surface 15b: Large collar portion 15c: Small collar portion 16: Tapered roller 17: Cage 17a: Large diameter ring portion 17b: Small diameter ring portion 17c: Pillar portion 18: Insertion space 19: Wide portion 20: Pull-out jig 21: Hook member

Claims (3)

An outer ring having an outer ring raceway surface on the inner peripheral surface and a shaft box mounted on the outer peripheral surface, an inner ring having an inner ring raceway surface on the outer peripheral surface and a shaft mounted on the inner peripheral surface, and the outer ring raceway surface. The tapered roller bearing is provided with a tapered roller row arranged so as to be rollable between the inner ring raceway surface and a cage having a plurality of pockets for accommodating and holding the tapered rollers of the tapered roller row at predetermined intervals. A large-diameter ring portion is provided on the large-diameter side and a small-diameter ring portion is provided on the small-diameter side, and a hook member of a pulling jig is provided between the inner peripheral surface of the small-diameter ring portion and the outer peripheral surface of the small bearing portion of the inner ring. A tapered roller bearing provided with an insertion space for insertion, wherein a wide portion is provided in a part of the insertion space in the circumferential direction. The tapered roller bearing according to claim 1, wherein a concave portion recessed on the outer diameter side is provided on the inner peripheral surface of the small diameter ring portion of the cage, and the wide portion is formed by the concave portion. The tapered roller bearing according to claim 1, wherein a concave portion recessed on the inner diameter side is provided on the outer peripheral surface of the small flange portion of the inner ring, and the wide portion is formed by the concave portion.

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