JP2024100616A - Assembly jig for conical roller bearing, assembly jig for double-row conical roller bearing, and assembly method of double-row conical roller bearing - Google Patents

Abstract

To provide an assembly jig for a conical roller bearing which can eliminate variations (unevenness) in intervals in a circumferential direction of adjacent conical rollers when the conical roller bearing is assembled, that is, when a rotary member is press-fitted in the conical roller bearing, and can prevent the conical roller from being restrained (locked) by a retainer.SOLUTION: An assembly jig 10A for a conical roller bearing includes: an annular part 11 formed in an annular manner; and a plurality of (the same number as conical rollers 4) claw parts 12 arranged side by side at an equal interval along a circumferential direction on a top surface 11c of the annular part 11, and protrusively provided so as to extend in an axial direction. Each of the plurality of claw parts 12 is fitted between the adjacent conical rollers 4 upon assembly, and a length of a base end part in the circumferential direction is set so that intervals in the circumferential direction of all the adjacent conical rollers 4 are equal.SELECTED DRAWING: Figure 2

Description

The present invention relates to an assembly jig for tapered roller bearings, an assembly jig for double-row tapered roller bearings using the assembly jig for tapered roller bearings, and a method for assembling double-row tapered roller bearings.

Conventionally, for example, double-row tapered roller bearings capable of simultaneously supporting radial loads and axial loads in both directions have been widely used to rotatably support rotating members such as drive pinion shafts and hubs (see, for example, Patent Document 1). A double-row tapered roller bearing is configured by pairing tapered roller bearings arranged opposite each other, each of which is configured to include an inner ring, an outer ring, a number of tapered rollers arranged to roll freely between the inner ring and the outer ring, and a cage that holds the tapered rollers.

Double-row tapered roller bearings are usually used with a preload applied between the inner and outer rings and tapered rollers to ensure durability (long life) and reliability. For example, when assembling a rotating member such as a shaft to a double-row tapered roller bearing, a preload is applied by pressing the rotating member such as a shaft into the double-row tapered roller bearing (inner ring) to expand the inner ring diameter.

JP 2002-283805 A

However, when a double-row tapered roller bearing is assembled, if a rotating member such as a shaft is pressed into the bearing when the spacing between adjacent tapered rollers is uneven (unequal), the tapered rollers can become constrained (locked) by the cage. If the rotating member is then operated (when a double-row tapered roller bearing is used) in this state (i.e., with the tapered rollers constrained by the cage), for example, the tapered rollers or inner rings can wear locally, which can lead to abnormal noise, etc.

The present invention has been made to solve the above problems, and aims to provide an assembly jig for tapered roller bearings that can eliminate the variation (irregularity) in the spacing between adjacent tapered rollers and prevent the tapered rollers from being restricted (locked) by the cage when assembling tapered roller bearings or double row tapered roller bearings (hereinafter referred to as "tapered roller bearings, etc."), i.e., when a rotating member is pressed into a tapered roller bearing, etc., and also provides an assembly jig for double row tapered roller bearings that uses the assembly jig for tapered roller bearings, and a method for assembling double row tapered roller bearings.

The tapered roller bearing assembly jig according to one aspect of the present invention is an assembly jig for tapered roller bearings used when assembling a tapered roller bearing comprising an inner ring, an outer ring, a number of tapered rollers arranged to roll freely between the inner ring and the outer ring, and a cage that holds the tapered rollers, to a rotating member, and is characterized in that it has an annular portion formed in an annular shape, and a number of claw portions equal to the number of tapered rollers that are arranged on the top surface of the annular portion at equal intervals along the circumferential direction and protrude in the axial direction, and each of the multiple claw portions is fitted between adjacent tapered rollers during assembly, and the circumferential length of the base end portion is set so that the circumferential spacing between all adjacent tapered rollers is equal.

According to the present invention, when a tapered roller bearing or the like is assembled, i.e., when a rotating member is pressed into a tapered roller bearing or the like, it is possible to eliminate the variation (irregularity) in the spacing between adjacent tapered rollers, and to prevent the tapered rollers from being restrained (locked) by the cage.

4 is a diagram showing the configuration of an assembly jig for one of the tapered roller bearings that constitutes the assembly jig for the double row tapered roller bearing according to the embodiment; FIG. FIG. 2 is a partial cross-sectional view (without the cage) showing an assembly jig for a double-row tapered roller bearing (an assembly jig for one of the tapered roller bearings) mounted on a double-row tapered roller bearing (one of the tapered roller bearings). FIG. 2 is an enlarged cross-sectional view showing a main portion of an assembly jig for a double-row tapered roller bearing (an assembly jig for one of the tapered roller bearings) attached to a double-row tapered roller bearing (one of the tapered roller bearings). 4A to 4C are diagrams for explaining a method of assembling a double-row tapered roller bearing using an assembly jig for a double-row tapered roller bearing according to an embodiment. FIG. 2 is a cross-sectional view showing the configuration of a double-row tapered roller bearing. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. FIG. 1 is a cross-sectional view showing a configuration of a double row tapered roller bearing applied to a drive pinion shaft.

Below, a preferred embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals will be used for the same or corresponding parts. In each drawing, the same elements will be given the same reference numerals and duplicate explanations will be omitted. In this embodiment, an assembly jig for a double row tapered roller bearing, which is used when assembling a double row tapered roller bearing, i.e., when a rotating member such as a shaft is press-fitted into the double row tapered roller bearing, will be used as an example for explanation.

First, the configuration of the double row tapered roller bearing assembly jig 10 according to the embodiment will be described with reference to Figures 1 to 3 and Figures 5 to 7. Figure 1 is a diagram showing the configuration of one of the tapered roller bearing assembly jigs 10A constituting the double row tapered roller bearing assembly jig 10. Figure 2 is a partial cross-sectional view (without retainer 5) showing the double row tapered roller bearing assembly jig 10 (one of the tapered roller bearing assembly jigs 10A) attached to the double row tapered roller bearing 1 (one of the tapered roller bearings 1A). Figure 3 is a cross-sectional view showing an enlarged main part of the double row tapered roller bearing assembly jig 10 (one of the tapered roller bearing assembly jigs 10A) attached to the double row tapered roller bearing 1 (one of the tapered roller bearings 1A). Figure 5 is a cross-sectional view showing the configuration of the double row tapered roller bearing 1. Figure 6 is a cross-sectional view taken along line VI-VI in Figure 5. FIG. 7 is a cross-sectional view showing the configuration of a double-row tapered roller bearing 1 applied to a drive pinion shaft 100.

The double-row tapered roller bearing 1 can simultaneously support radial loads and axial loads in both directions, and rotatably supports a rotating member 100 such as a drive pinion shaft or a hub (see FIG. 7). Note that FIG. 7 shows the double-row tapered roller bearing 1 applied to the drive pinion shaft 100 of a continuously variable transmission (CVT).

The double row tapered roller bearing 1 is configured by pairing two tapered roller bearings 1A and 1B (one tapered roller bearing 1A and the other tapered roller bearing 1B) that are configured with an inner ring 2, an outer ring 3, a plurality of (e.g., 18) tapered rollers 4 arranged freely rolling between the inner ring 2 and the outer ring 3, and a retainer 5 that holds the plurality of tapered rollers 4 along the circumferential direction. For example, the double row tapered roller bearing 1 according to this embodiment is an outward-facing type double row tapered roller bearing that is configured with a pair of inner rings 2, one outer ring 3, a plurality of tapered rollers 4 arranged freely rolling between one inner ring 2 and the outer ring 3 and between the other inner ring 2 and the outer ring 3, and a pair of retainers 5 that hold the plurality of tapered rollers 4 at predetermined intervals along the circumferential direction.

More specifically, the inner ring 2 has a conical raceway surface on its outer diameter surface, and a large rib (rib portion) 2a that protrudes toward the outer diameter side is formed on the large end side (large diameter side) of the raceway surface. Also, to prevent the tapered rollers 4 from falling off toward the small end side, a small rib (rib portion) 2b is formed on the small end side (small diameter side) of the inner ring 2.

The outer ring 3 has a pair of conical raceways on its inner diameter surface, and a number of tapered rollers 4 held by a cage 5 roll (revolve while rotating) on these raceways and the raceway surface of the inner ring 2.

The cage 5 has a pair of annular portions (a large diameter annular portion and a small diameter annular portion) and a column portion that connects the annular portions (the large diameter annular portion and the small diameter annular portion), and accommodates the tapered rollers 4 rotatably in the accommodation portions (pockets) 5a formed between adjacent column portions along the circumferential direction.

In each of the tapered roller bearings 1A and 1B, the tapered rollers 4 are in line contact with the raceway surfaces of the inner and outer rings, and are designed so that the inner and outer ring raceway surfaces and the roller centers coincide at a single point on the shaft center.

Double-row tapered roller bearings 1 are usually used with a preload applied between the inner and outer rings and tapered rollers from the standpoint of durability (long life) and reliability. For example, when assembling a rotating member 100 such as a shaft to the double-row tapered roller bearing 1, the rotating member 100 such as a shaft is pressed into the double-row tapered roller bearing 1 (inner ring 2) to enlarge the inner ring diameter, thereby applying a preload.

However, when the double row tapered roller bearing 1 is assembled, if the spacing between adjacent tapered rollers 4 is not uniform (unequal), i.e., if the tapered rollers 4 are not in the correct position, and the rotating member 100 such as a shaft is pressed in, it is possible that the tapered rollers 4 will be constrained (locked) by the cage 5. If the rotating member 100 is subsequently operated (when the double row tapered roller bearing 1 is used) in this state (i.e., with the tapered rollers 4 constrained by the cage 5), for example, the tapered rollers 4 and the inner ring 2 may wear locally, which may result in abnormal noise, etc.

Therefore, when assembling the double row tapered roller bearing 1, i.e., when the rotating member 100 is pressed into the double row tapered roller bearing 1, an assembly jig 10 for the double row tapered roller bearing is used.

The double row tapered roller bearing assembly jig (hereinafter sometimes simply referred to as the "assembly jig") 10 has the function of eliminating the variation (irregularity) in the circumferential spacing between adjacent tapered rollers 4 when assembling the double row tapered roller bearing 1, i.e., when the rotating member 100 is pressed into the double row tapered roller bearing 1, thereby making the pitch uniform (aligning the tapered rollers 4 in the correct position) and preventing the tapered rollers 4 from being restrained (locked) by the cage 5.

The double row tapered roller bearing assembly jig 10 is equipped with a pair of tapered roller bearing assembly jigs 10A, 10B (one (first) tapered roller bearing assembly jig 10A and the other (second) tapered roller bearing assembly jig 10B) that are arranged opposite each other during assembly. One tapered roller bearing assembly jig 10A (hereinafter sometimes referred to as "one assembly jig 10A") is attached (set) to one tapered roller bearing 1A that constitutes the double row tapered roller bearing 1. Similarly, the other tapered roller bearing assembly jig 10B (hereinafter sometimes referred to as "the other assembly jig 10B") is attached (set) to the other tapered roller bearing 1B that constitutes the double row tapered roller bearing 1. Note that one assembly jig 10A and the other assembly jig 10B have the same shape (configuration), so next we will explain the configuration of one assembly jig 10A as an example.

One of the assembly jigs (press-in adapter with roller alignment fork) 10A is mainly composed of a circular ring portion 11 and a claw portion 12.

The annular portion 11 is formed in an annular shape. More specifically, the annular portion 11 is configured to have an annular main body portion 11a formed in an annular shape and an annular protruding portion 11b provided in an annular shape on the upper surface of the annular main body portion 11a. The annular main body portion 11a is attached (fitted) to a base (pedestal) 201 of a press-fitting machine 200 described below. The annular protruding portion 11b has a radial length (depth/thickness) that is shorter (thinner) than the annular main body portion 11a, and is set to a length (thickness) that allows it to enter between the inner ring 2 and the cage 5 as shown in FIG. 3.

The top surface (upper end surface) 11c of the annular protrusion 11b of the annular portion 11 from which the claw portion 12 protrudes is formed to be approximately flush with (or lower than) the inner surface of the large rib 2a of the inner ring 2 so as to close the gap between the large end surface 4a of the tapered roller 4 and the large rib 2a of the inner ring 2 during assembly, as shown in FIG. 3, in order to regulate the vertical position (axial position) of the tapered roller 4 to an appropriate position.

The claws (forks) 12 are arranged at equal intervals (equal pitch) along the circumferential direction on the top surface 11c of the annular protrusion 11b that constitutes the annular portion 11, and protrude so as to extend in the axial direction. The number of claws 12 is the same as the number of tapered rollers 4 (for example, 18).

When assembled, each of the multiple claw portions 12 is fitted between adjacent tapered rollers 4. The circumferential length (width) of the base end (root) of each of the multiple claw portions 12 is set so that the circumferential spacing between all adjacent tapered rollers 4 is equal (equal pitch). In other words, the claw portions 12 align the tapered rollers 4 in the appropriate positions.

The base end of the claw portion 12 is formed, for example, in a rectangular column shape. Also, the tip end of the claw portion 12 is formed thinner than the base end (root) so that it can easily fit between adjacent tapered rollers 4. In other words, the claw portion 12 is formed in a tapered shape. Note that it is sufficient that the tip of the claw portion 12 is tapered at least in the circumferential direction.

The double row tapered roller bearing assembly jig 10 (annular portion 11, claw portion 12) is made of, for example, resin (engineering plastic) so as not to damage the tapered rollers 4, etc.

Next, a method for assembling a double row tapered roller bearing using the double row tapered roller bearing assembly jig 10 will be described with reference to Figure 4. Figure 4 is a diagram for explaining a method for assembling a double row tapered roller bearing using the double row tapered roller bearing assembly jig 10 (first to third steps).

When assembling the double row tapered roller bearing 1, that is, when the rotating member (shaft) 100 is pressed into the double row tapered roller bearing 1, first, in the first step, one of the tapered roller bearings 1A constituting the double row tapered roller bearing 1 is attached (set) to one of the assembly jigs 10A constituting the double row tapered roller bearing assembly jig 10 attached (fitted) to the base (seat) 201 of the press-fitting machine 200, so that the claw portion 12 fits between adjacent tapered rollers 4. This makes the tapered rollers 4 of one of the tapered roller bearings 1A have an equal pitch (the tapered rollers 4 are aligned in the correct position).

Next, in the second step, the other assembly jig 10B constituting the double row tapered roller bearing assembly jig 10 is attached (set) to the other tapered roller bearing 1B constituting the double row tapered roller bearing 1 so that the claw portion 12 fits between adjacent tapered rollers 4. Here, the other assembly jig 10B is attached so that it faces the one assembly jig 10A (i.e., upside down). This makes the tapered rollers 4 of the other tapered roller bearing 1B have an equal pitch (the tapered rollers 4 are aligned in the correct position).

Next, in the third step, the pressing cylinder 202 of the pressing machine 200 is lowered to press the rotating member (drive pinion shaft) 100 into the double row tapered roller bearing 1 (one tapered roller bearing 1A and the other tapered roller bearing 1B) to which the double row tapered roller bearing assembly jig 10 (one assembly jig 10A and the other assembly jig 10B) is attached.

Then, in the fourth step, the double row tapered roller bearing assembly jig 10 is removed from the double row tapered roller bearing 1. That is, one assembly jig 10A is removed from one tapered roller bearing 1A, and the other assembly jig 10B is removed from the other tapered roller bearing 1B.

As described above in detail, this embodiment includes an annular portion 11 formed in an annular shape, and a plurality of claw portions 12 (the same number as the tapered rollers 4) that are arranged at equal intervals along the circumferential direction on the top surface 11c of the annular portion 11 and protrude so as to extend in the axial direction, and each of the plurality of claw portions 12 is fitted between adjacent tapered rollers 4 during assembly, and the circumferential length of the base end portion is set so that the circumferential intervals between all adjacent tapered rollers 4 are equal. Therefore, the circumferential intervals between all adjacent tapered rollers 4 can be made equal (i.e., the tapered rollers 4 can be aligned in the appropriate position by making the pitch equal). As a result, according to this embodiment, when the double row tapered roller bearing 1 is assembled, i.e., when the rotating member 100 is pressed into the double row tapered roller bearing 1, it is possible to eliminate the variation (irregularity) in the spacing (circumferential direction) between adjacent tapered rollers 4, and to prevent the tapered rollers 4 from being restrained (locked) by the cage 5.

This also makes it possible to prevent localized wear of the tapered rollers 4 and the inner ring 2, and thus to prevent the generation of abnormal noise, etc.

In this embodiment, the tip of the claw portion 12 is made thinner than the base end. Therefore, the claw portion 12 can be easily fitted between adjacent tapered rollers 4 (between tapered rollers 4 and tapered rollers 4).

According to this embodiment, the top surface 11c of the annular protrusion 11b of the annular portion 11 from which the claw portion 12 protrudes is formed to be approximately flush with the inner surface of the large rib 2a of the inner ring 2 so that the gap between the large end face 4a of the tapered roller 4 and the large rib 2a of the inner ring 2 is filled during assembly. Therefore, the vertical position (axial position) of the tapered roller 4 can be regulated to an appropriate position.

According to this embodiment, a pair of assembly jigs 10A and 10B are provided that are arranged opposite each other during assembly. In other words, by using two assembly jigs 10A and 10B of the same shape, it is possible to accommodate a double row tapered roller bearing 1.

The assembly method according to this embodiment includes a first step in which one assembly jig 10A is attached to one tapered roller bearing 1A so that the claw portion 12 fits between adjacent tapered rollers 4, a second step in which the other assembly jig 10B is attached to the other tapered roller bearing 1B so that the claw portion 12 fits between adjacent tapered rollers 4, a third step in which a rotating member 100 is pressed into the double row tapered roller bearing 1 to which the one assembly jig 10A and the other assembly jig 10B (assembly jig 10) are attached, and a fourth step in which the one assembly jig 10A and the other assembly jig 10B (assembly jig 10) are removed. Therefore, as described above, according to this embodiment, when the double row tapered roller bearing 1 is assembled, that is, when the rotating member 100 is pressed into the double row tapered roller bearing 1, the variation (irregularity) in the spacing between adjacent tapered rollers 4 can be eliminated, and it is possible to prevent the tapered rollers 4 from being restrained (locked) by the cage 5.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications are possible. For example, the above embodiment has been described using an outward-facing type (using double row outer rings) double row tapered roller bearing 1 as an example, but the present invention can also be applied (corresponds) to an inward-facing type (using double row inner rings) double row tapered roller bearing or a combined tapered roller bearing.

In addition, in the above embodiment, the application to a double-row tapered roller bearing 1 has been described as an example, but the present invention can also be applied to a single-row tapered roller bearing. When applying to a single-row tapered roller bearing, it is sufficient to use only the assembly jig 10A (or 10B) for one of the tapered roller bearings.

In addition, the shape, material, size, etc. of the double row tapered roller bearing assembly jig 10 are not limited to the above embodiment, and can be changed as desired depending on, for example, the double row tapered roller bearing to be applied and the requirements, etc.

1. Double row tapered roller bearings
1A, 1B Tapered roller bearing 2 Inner ring 2a Large flange 2b Small flange 3 Outer ring 4 Tapered roller 4a Large end face 5 Cage 5a Receiving portion (pocket)
REFERENCE SIGNS LIST 10: Double row tapered roller bearing assembly jig 10A, 10B: Tapered roller bearing assembly jig 11: Ring portion 11a: Ring main body portion 11b: Ring convex portion 11c: Top surface 12: Claw portion 100: Rotating member (shaft)
200 Pressing machine 201 Surface plate (base)
202 Press-fit cylinder

Claims (5)

An assembly jig for a tapered roller bearing used when assembling a tapered roller bearing comprising an inner ring, an outer ring, a plurality of tapered rollers arranged to roll between the inner ring and the outer ring, and a cage that holds the plurality of tapered rollers, to a rotating member, comprising:
An annular portion formed in an annular shape;
and claw portions, the number of which is the same as the number of the tapered rollers, which are arranged at equal intervals along the circumferential direction on a top surface of the annular portion and protrude so as to extend in the axial direction,
An assembly jig for a tapered roller bearing, characterized in that each of the multiple claw portions is fitted between adjacent tapered rollers during assembly, and the circumferential length of the base end portion is set so that the circumferential spacing between all adjacent tapered rollers is equal. An assembly jig for a tapered roller bearing as described in claim 1, characterized in that the tip end of the claw portion is thinner than the base end. The tapered roller bearing assembly jig according to claim 2, characterized in that the top surface of the annular portion from which the claws protrude is formed to be approximately flush with the inner surface of the large rib of the inner ring so that the gap between the large end surface of the tapered roller and the large rib of the inner ring is filled when assembled. An assembly jig for a double row tapered roller bearing used when assembling a double row tapered roller bearing, in which a pair of tapered roller bearings are arranged opposite each other, the double row tapered roller bearing comprising an inner ring, an outer ring, a plurality of tapered rollers arranged to roll freely between the inner ring and the outer ring, and a cage that holds the plurality of tapered rollers, to a rotating member,
4. An assembly jig for a double row tapered roller bearing, comprising a pair of assembly jigs for a tapered roller bearing according to claim 3, which are arranged opposite each other during assembly. a first step of mounting one of the tapered roller bearings constituting the double row tapered roller bearing assembly jig according to claim 4 to one of the tapered roller bearings constituting the double row tapered roller bearing such that the claw portions fit between adjacent tapered rollers;
a second step of attaching an assembly jig for another tapered roller bearing constituting the assembly jig for the double row tapered roller bearing to the other tapered roller bearing constituting the double row tapered roller bearing so that the claw portions fit between adjacent tapered rollers;
a third step of press-fitting a rotating member into the double row tapered roller bearing to which the assembly jig for the double row tapered roller bearing is attached;
and a fourth step of removing the assembly jig for the double row tapered roller bearing.

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