JP2022103762A - Roller restriction jig and shrink-fit method of inner ring assembly - Google Patents

Abstract

To extremely reduce a possibility that, when induction-heating an inner ring assembly to which a plurality of cylinder rollers and a cage are assembled to an external periphery of an inner ring, the cylinder rollers may be brought into a firmly-astringed state in which the cylinder rollers cannot smoothly rotate.SOLUTION: A jig formed of an insulation material is fit to an external periphery of an inner ring assembly 15, being the inner ring assembly 15 which is formed by assembling a brass-made machined cage 14 in which steel-made cylinder rollers 13 are accommodated in a plurality of pocket parts 14c to an external periphery of a steel-made inner ring 12 which is composed of a so-called both-flanged inner ring when induction-heating the inner ring assembly 15 in which engagement pieces 14d capable of engaging with the cylinder rollers 13 accommodated in the respective pocket parts 14c in a radial direction are provided in the cage 14. The jig (roller restriction jig) 1 has an annular roller restriction face 2 for restricting the cylinder rollers 13 so as not to contact with the engagement pieces 14d by pressurizing the cylinder rollers 13 accommodated in the respective pocket parts 14c to the inside of a radial direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a roller restraining jig and a method for shrink-fitting an inner ring assembly. The present invention relates to a roller restraint jig fitted to the outer periphery of the product, and a method of shrink-fitting an inner ring assembly carried out using the roller restraint jig.

Cylindrical roller bearings, which are a type of rolling bearing, are suitably used in applications that rotatably support shafts that rotate at high speed under the action of large radial loads (for example, spindles of transmissions, reduction gears, machine tools, etc.). .. For example, in Patent Document 1 below, an outer ring having a cylindrical outer raceway surface on the inner peripheral surface, an inner ring having a cylindrical inner raceway surface on the outer peripheral surface, and an arrangement between the outer raceway surface and the inner raceway surface. It is equipped with a plurality of cylindrical rollers and a cage that holds each of the plurality of cylindrical rollers in a rotatable (rolling) state, and the cage is a machined product of a metal material, which is also called a punching cage. Cylindrical roller bearings made of (machined products) are described. In this case, the outer ring, inner ring and cylindrical roller are made of a steel material having excellent mechanical strength and wear resistance, while the cage is made of a copper material such as brass having excellent workability and compatibility. To.

As a means for fixing the inner ring of the cylindrical roller bearing to the rotating shaft, so-called shrink fitting may be adopted (for example, Patent Document 1). The shrink fitting is performed, for example, as follows.
(1) By heating and thermally expanding the inner ring having the shaft hole whose fit to the rotating shaft in the unheated state is the "tightening fit" specified in JIS B 0401, the shaft hole is made smooth by the rotating shaft. Increase the diameter to the extent that it can be inserted. There are no restrictions on the heating method of the inner ring as long as the entire inner ring can be heated uniformly, but the heating efficiency is excellent (the heating time is short), the temperature can be controlled easily and accurately, and the environmental load is small. In many cases, induction heating, which has many merits such as, is adopted.
(2) Next, after inserting the rotating shaft into the shaft hole in the expanded diameter state, the inner ring is cooled to reduce the diameter of the shaft hole, and the inner peripheral surface of the inner ring is fixed to the outer peripheral surface of the rotating shaft.

JP-A-2015-78737

By the way, for example, a transmission or the like is a cylindrical roller bearing in which a so-called inner ring with both flanges is adopted, in which an annular flange portion that can be engaged with a cylindrical roller in the axial direction is provided on both sides of the inner race surface in the axial direction. When mounting on the inner ring, not the inner ring alone, but the inner ring, multiple cylindrical rollers, and the assembly (inner ring assembly) of the cage (the above-mentioned machined cage; the same shall apply hereinafter) are shrink-fitted to the rotating shaft. In some cases. In this case, as the inner ring assembly is induced and heated, not only the inner ring but also the cylindrical roller and the cage are induced and heated. As described above, the steel inner ring and the cylindrical roller are adopted. On the other hand, when a copper cage is adopted, the expansion / contraction amount of the copper cage having a relatively large linear expansion coefficient is larger than the expansion / contraction amount of the inner ring and the cylindrical roller. In this way, when the cage expands and contracts more than the inner ring and the cylindrical roller, the cylindrical roller housed in the pocket portion of the cage is bitten by the pocket portion and cannot rotate smoothly (hard astringency). There is a risk that the desired bearing performance will not be exhibited.

In particular, in order to prevent the cylindrical roller housed in the pocket part of the cage from falling off radially outward, an engaging piece that can be radially engaged with the cylindrical roller housed in the pocket part is attached to the cage. If it is provided (when a cylindrical roller is inserted into the pocket of the cage when assembling the inner ring assembly), the above-mentioned astringency problem is likely to occur when the inner ring assembly is induced and heated.

In view of the above circumstances, the present invention is a technical means capable of reducing the possibility of the above-mentioned astringency problem as much as possible when the inner ring assembly is induced and heated, for example, when the inner ring assembly is shrink-fitted onto a rotating shaft. The purpose is to provide.

In order to achieve the above object, in the present invention, in the present invention, a steel cylindrical roller is provided on each of a plurality of pocket portions on the outer periphery of a steel inner ring having an annular flange portion provided on the inner raceway surface and both sides thereof in the axial direction. It is an inner ring assembly formed by assembling a brass punching cage that accommodates the above-mentioned inner ring, and the above-mentioned inner ring is provided with an engaging piece that engages radially with the cylindrical roller accommodated in the pocket portion. A jig made of an insulating material that is fitted to the outer periphery of the inner ring assembly when the assembly is induced and heated. By pressurizing the cylindrical rollers housed in each pocket portion inward in the radial direction, each Provided is a roller restraining jig characterized by having an annular roller restraining surface for restraining a cylindrical roller in a non-contact state with an engaging piece.

When the inner ring assembly is induced and heated with the roller restraint jig fitted on the outside, the cylindrical roller housed in each pocket of the punching cage (retainer) is pressurized inward in the radial direction, that is, the cylinder. The inner ring assembly can be induced and heated in a non-contact state between the roller and the engaging piece provided on the cage. Therefore, even if the cage expands more than the cylindrical roller (and inner ring) due to induction heating of the inner ring assembly, the cylindrical roller housed in the pocket of the cage is bitten by the engaging piece. It is possible to prevent as much as possible from falling into a hard state where it cannot rotate smoothly.

The roller restraint surface can be formed as a cylindrical surface having a constant diameter, or can be formed in a tapered shape in which the diameter is gradually reduced from one side in the axial direction to the other side.

The roller restraint jig has a tapered shape with a gradually reduced diameter from one side in the axial direction to the other side, and an annular roller guide having a larger inclination angle in the axial direction than the roller restraint surface (tapered roller restraint surface). A surface may be provided, and in this case, it is preferable to connect the end of the roller guide surface on the other side in the axial direction to the end of the roller restraint surface on the other side in the axial direction. If such a roller guide surface is provided, the fitting workability of the roller restraint jig with respect to the inner ring assembly can be improved, and the roller restraint surface can be accurately arranged on the outer periphery of the cylindrical roller constituting the inner ring assembly. can.

Since the roller restraint jig having the above configuration is made of an insulating material, it is not directly induced and heated, but at least the roller restraint surface that restrains the cylindrical roller (contacts with the cylindrical roller) is There is a possibility that the temperature will rise to about 200 ° C. under the influence of the heat of the cylindrical roller that is induced to be heated. Therefore, when the roller restraint jig is made of a resin material which is a kind of insulating material, a thermoplastic resin having a linear expansion coefficient of 50 × 10 ^-6 / ° C or less and a melting point of 250 ° C or more is used as a base resin. It is preferable to use the resin material used as the above. As a result, it is possible to realize a roller restraining jig capable of appropriately restraining each cylindrical roller while being inexpensive.

Further, in the present invention, a brass made of brass in which a steel cylindrical roller is housed in each of a plurality of pocket portions on the outer periphery of a steel inner ring having an inner raceway surface and annular flange portions provided on both sides in the axial direction thereof. An inner ring assembly to which a punching cage is assembled, and an engaging piece that can be radially engaged with a cylindrical roller housed in each pocket rotates the inner ring assembly provided in the punching cage. Roller restraint made of insulating material that restrains each cylindrical roller in a state of non-contact with the engaging piece by pressurizing the cylindrical roller accommodated in each pocket portion radially inward when shrink-fitting to the shaft. Provided is a method for shrink-fitting an inner ring assembly, which comprises a heating step of inducing and heating the inner ring assembly in a state where the jig is fitted to the outer periphery of the inner ring assembly.

According to such a shrink fitting method of the inner ring assembly, when the inner ring assembly is induced and heated, the cylindrical roller housed in the pocket portion of the punching cage (retainer) is pressurized inward in the radial direction. That is, the inner ring assembly can be induced and heated in a state of being disengaged from the engaging piece provided in the cage. Therefore, as the inner ring assembly is induced and heated, it is possible to prevent the cylindrical rollers housed in each pocket portion from being bitten into the pocket portion and falling into a rigid state in which the inner ring assembly cannot rotate smoothly. be able to.

From the above, according to the present invention, for example, when the inner ring assembly is induced and heated when the inner ring assembly is shrink-fitted onto the rotating shaft, there is a possibility that the cylindrical roller may not rotate smoothly, resulting in a tight astringency problem. It can be reduced as much as possible.

(A) is a partial side view of the cylindrical roller bearing, (b) is a partial cross-sectional view of the cylindrical roller bearing, and (c) is a sectional view taken along line XX of FIG. (A) is a diagram showing a preparatory stage of a heating process for inducing heating the inner ring assembly, and (b) is a diagram showing an implementation stage of the heating process. It is a figure for demonstrating the dimensional relationship between the roller restraint jig and the inner ring assembly which concerns on one Embodiment of this invention.

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

The present invention relates to a roller restraint jig 1, but for convenience, first, an example of a cylindrical roller bearing 10 including an inner ring assembly to which the roller restraint jig 1 is used is shown in FIGS. 1 (a) to 1 (c). Will be explained based on. 1 (a) is a partial schematic side view of the cylindrical roller bearing 10, FIG. 1 (b) is a partial cross-sectional view of the cylindrical roller bearing 10, and FIG. 1 (c) is X of FIG. 1 (a). -It is a cross-sectional view taken along the line X-ray.

The cylindrical roller bearings 10 shown in FIGS. 1A to 1C have an outer ring 11 having a cylindrical outer raceway surface 11a on the inner peripheral surface, an inner ring 12 having a cylindrical inner raceway surface 12a on the outer peripheral surface, and the like. A plurality of cylindrical rollers 13 rotatably arranged between the outer raceway surface 11a and the inner raceway surface 12a, and a plurality of cylindrical rollers 13 arranged between the outer ring 11 and the inner ring 12 at predetermined intervals in the circumferential direction. It is an inner ring rotation type cylindrical roller bearing 10 provided with an annular cage 14.

As shown in FIG. 1 (c), the inner ring 12 is provided on both sides of the inner raceway surface 12a in the axial direction, and is an annular shape capable of axially engaging with the cylindrical rollers 3 arranged between the raceway surfaces 11a and 12a. It is composed of a so-called inner ring with both collars, which has a collar portion 12b integrally. The inner ring 12, the outer ring 11, and the cylindrical roller 13 are steel parts that have been subjected to heat treatment such as quenching and tempering.

The cage 14 has a pair of annular portions 14a arranged in parallel at intervals in the axial direction, a plurality of pillar portions 14b connected to both annular portions 14a at intervals in the circumferential direction, and adjacent columns. It is provided with a pocket portion 14c defined between the portions 14b and individually accommodating the cylindrical rollers 13. The cage 14 having such a configuration is a so-called punching cage in which the annular portion 14a and the pillar portion 14b are integrally formed by performing machining such as cutting on a brass material having excellent workability and familiarity. To.

The cylindrical roller 13 is housed in the pocket portion 14c of the cage 14 in a state of being rotatable and radially movable. As shown in FIG. 1 (b), the opening dimension (circumferential dimension of the outer diameter side opening) P1 of the outer diameter end of the pocket portion 14c is set to be smaller than the diameter dimension of the cylindrical roller 13 by a predetermined amount, and the pocket is set. The opening dimension (circumferential dimension of the inner diameter side opening) P2 of the inner diameter end portion of the portion 14c is set to be slightly larger than the diameter dimension of the cylindrical roller 13. Here, the above-mentioned opening dimension P1 is realized by providing a protruding engaging piece 14d protruding inward of the pocket portion 14c at the outer diameter end portion of each pillar portion 14b. With the above configuration, the cylindrical roller 13 housed in the pocket portion 14c can move radially inward until it abuts on the inner raceway surface 12a of the inner ring 12, and is radially outward until it engages with the engaging piece 14d. It is possible to move to.

In the cylindrical roller bearing 10 having the above configuration, as shown in FIG. 1 (c), the inner ring 12 is attached and fixed to the rotating shaft (for example, the main shaft of the transmission) Sa, and the outer ring 11 is a stationary member (not shown). For example, it is used in a state of being fixed to the inner circumference of the shaft box of the transmission), and the inner ring 12 is attached and fixed to the outer peripheral surface of the rotating shaft Sa by shrink fitting that can secure a high fixing strength. Therefore, as the inner ring 12, one having a shaft hole 12c whose fitting to the rotating shaft Sa in the unheated state (natural state before shrink fitting) is the “tightening fit” specified in JIS B 0401 is used.

The shrink fitting step of shrink fitting the inner ring 12 with respect to the rotating shaft Sa is
A heating step in which the shaft hole 12c of the inner ring 12 is expanded to such an extent that the rotating shaft Sa can be smoothly inserted by inducing heating the inner ring 12 to cause thermal expansion.
By cooling the inner ring 12 with the rotating shaft Sa inserted into the shaft hole 12c in the expanded diameter state to reduce the diameter, the inner peripheral surface of the inner ring 12 (inner wall surface of the shaft hole 12c) is changed to the outer peripheral surface of the rotating shaft Sa. Including a cooling step of fixing to.

By the way, the inner ring 12 may be shrink-fitted to the rotating shaft Sa in a single state, but here, in the state of an assembly in which a plurality of cylindrical rollers 13 and a cage 14 are assembled on the outer circumference of the inner ring 12. It is shrink-fitted to the rotating shaft Sa. In the roller restraint jig 1 according to the embodiment of the present invention, the inner ring assembly 15 in which a plurality of cylindrical rollers 13 and the cage 14 are assembled on the outer periphery of the inner ring 12 shown in FIG. 2A is attached to the rotating shaft Sa. It is used in the above-mentioned heating step, cooling step, or both performed during shrink fitting. In the inner ring assembly 15, the inner ring 12 has an inner ring with both crossguards, and the cage 14 is an engaging piece that can be radially engaged with the cylindrical roller 13 housed in the pocket portion 14c. Since the (integrated) punching cage provided with 14d is adopted, the cage 14 is arranged on the radial outer side of the inner ring 12, and then for each pocket portion 14c of the cage 14. It is obtained by pushing (pushing in) the cylindrical roller 13 from the outside in the radial direction. Hereinafter, an example of an embodiment of the heating step will be described.

As shown in FIG. 2A, the induction-heated inner ring assembly 15 is placed on the support surface in a horizontal posture in which the central axis of the inner ring 12 is arranged along the vertical direction, and the inner ring is placed on the inner circumference thereof. A core 7 of an induction heating device electrically connected to a high frequency power supply (not shown) is arranged. Further, a roller restraint jig 1 formed in an annular shape with an insulating material is arranged (fitted) on the outer periphery of the inner ring assembly 15 placed on the support surface [FIGS. 2 (b) and 3 (FIG. 3). ]. The roller restraint jig 1 of the present embodiment is an injection-molded product which is injection-molded into an annular shape with a resin material using a thermoplastic resin as a base resin.

An annular roller restraint surface 2 is formed on the inner peripheral surface of the roller restraint jig 1, and the core 7 is energized (induction heating of the inner ring assembly 15) by the roller restraint surface 2 described above. In the state where the cylindrical roller 13 is restrained, that is, the cylindrical roller 13 housed in the pocket portion 14c of the cage 14 is pressurized inward in the radial direction, and each cylindrical roller 13 is combined with the engaging piece 14d provided in the cage 14. Is performed in a non-contact state without contact (engagement).

If the inner ring assembly 15 is induced and heated in this embodiment, the steel inner ring 12 and the cylindrical roller 13 are adopted, while the brass cage 14 is adopted, and the inner ring assembly 15 is induced and heated. Even when the cage 14 is thermally expanded larger than the inner ring 12 and the cylindrical roller 13, the cylindrical roller 13 and the engaging piece 14d provided on the cage 14 can be held in a non-contact state. Therefore, even when the inner ring assembly 15 is induced and heated to a predetermined temperature (furthermore, when the inner ring assembly 15 is cooled to reduce the diameter of the inner ring 12 (shaft hole 12c)), the inner ring assembly 15 is accommodated in the pocket portion 14c. It is possible to prevent as much as possible from the cylindrical roller 13 being bitten into the engaging piece 14d provided in the cage 14 and falling into a rigid state in which the cylinder roller 13 cannot rotate smoothly.

The roller restraint surface 2 of the present embodiment is gradually reduced in diameter from one side in the axial direction (the lower side of the paper surface in FIGS. 2 and 3 and the start side of fitting to the outer circumference of the inner ring assembly 15) toward the other side. It is formed in a tapered shape. In this case, even if the roller restraint jig 1 moves downward due to its own weight due to thermal expansion of the roller restraint jig 1 (the diameter of the roller restraint surface 2 expands) as the inner ring assembly 15 is induced and heated. , Each cylindrical roller 13 can be restrained in a non-contact state with the engaging piece 14d of the cage 14.

The end of the inner peripheral surface of the roller restraint jig 1 on one side in the axial direction has a tapered shape gradually reduced in diameter from one side in the axial direction to the other side, and has an inclination angle with respect to the axial direction from the roller restraint surface 2. A guide surface 3 is provided as an annular roller having a large diameter. The end portion of the roller guide surface 3 on the other side in the axial direction is connected to the end portion 2a on the one side in the axial direction of the roller restraint surface 2. If such a roller guide surface 3 is provided, the fitting workability of the roller restraint jig 1 with respect to the inner ring assembly 15 is improved, and the roller restraint surface 12 is accurately placed on the outer periphery of the cylindrical roller 13 of the inner ring assembly 15. Can be placed.

Of the roller restraint jig 1, the roller restraint surface 2 that comes into contact with the cylindrical roller 13 that is induced to be heated may be affected by the heat of the cylindrical roller 13 and the temperature may rise to about 200 ° C. Therefore, as the base resin constituting the resin material for forming the roller restraint jig 1, a resin having a melting point of 250 ° C. or higher is selectively used. Further, when the roller restraint jig 1 is thermally expanded (diameter expanded) to the extent that the restraint of the cylindrical roller 13 by the roller restraint surface 2 is released as the inner ring assembly 15 is induced to be heated, the roller restraint is cured. There is no point in using tool 1. Therefore, it is preferable to select and use a base resin having a linear expansion coefficient of 50 × 10 ^-6 / ° C. or less. Examples of those having both the above melting point and the coefficient of linear expansion include polyphenylene sulfide (PPS) and polyetheretherketone (PEEK). As long as the insulating property of the roller restraint jig 1 is not adversely affected, the resin material for forming the roller restraint jig 1 may include various fillers such as a reinforcing filler such as glass fiber. good.

In addition, in order to appropriately restrain the cylindrical roller 13 of the inner ring assembly 15 when the inner ring assembly 15 is induced to be heated, the roller restraint cure of the present embodiment having the above-mentioned tapered roller restraint surface 2 and roller guide surface 3 described above. In tool 1, the following configuration is adopted.

First, the inner ring assembly 15 when the cylindrical roller 13 housed in the pocket portion 14c is positioned most radially outward (when the cylindrical roller 13 is engaged with the engaging piece 14d) before the induction heating. The diameter dimension of the roller circumscribing circle (circular trajectory formed by connecting the radial outer ends of each cylindrical roller 13), that is, the maximum diameter dimension of the roller circumscribing circle of the inner ring assembly 15 before induction heating is A (Fig. 3), the diameter dimension at the end (lower end) 2a on one side in the axial direction of the roller restraint surface 2 before the induction heating is C (FIG. 3), and the cylinder accommodated in the pocket portion 14c at the stage before the induction heating. When the roller 13 is positioned most radially inward (when the outer peripheral surface of the cylindrical roller 13 is in contact with the inner raceway surface 12a of the inner ring 12), the maximum diameter dimension of the roller circumscribing circle of the inner ring assembly 15 is A'. Then, the diameter dimension C is set so that the relational expression of A> C> A'is established.

Further, the diameter dimension B (FIG. 3) at one end of the roller guide surface 3 provided on the roller restraint jig 1 in the axial direction is set to be larger than the above-mentioned maximum diameter dimension A (B> A).

To summarize the above, in the roller restraint jig 1 of the present embodiment, the roller restraint surface 2 and the roller guide surface 3 are formed so that the relational expression of B> A> C> A'is established. As a result, the fitting workability when the roller restraint jig 1 is fitted to the outer circumference of the inner ring assembly 15 from the side where the roller guide surface 3 is provided is improved, and the roller restraint surface 2 is placed on the outer circumference of the inner ring assembly 15. It can be arranged with high accuracy (the cylindrical roller 13 of the inner ring assembly 15 can be accurately constrained by the roller restraint surface 2).

Further, the minimum of the roller circumscribing circle when the cylindrical roller 13 housed in the pocket portion 14c is positioned most radially inward (when the outer peripheral surface of the cylindrical roller 13 is brought into contact with the inner raceway surface 12a of the inner ring 12). Assuming that the diameter dimension is A "and the diameter dimension at the end 2b on the other side of the roller restraint surface 2 in the axial direction is D (see FIG. 3), the diameter dimension D is set so that the relational expression D <A" is established. Further, the value calculated by dividing the diameter dimension D by the minimum diameter dimension A "is less than 0.99 [(D / A") <the relational expression of 0.99 holds]. , The diameter dimension D is set.

The roller restraint surface 2 was formed so that the above relational expression was established, and the base resin constituting the resin material for forming the roller restraint jig 1 was a wire of 50 × 10 ^-6 / ° C or less. By selectively using a material having an expansion coefficient (for example, PPS or PEEK), the roller restraint surface 2 is heated by the heat of the inner ring assembly 15 (particularly the cylindrical roller 13) that is induced to be heated, and its diameter is increased. Even when the size is increased, the cylindrical roller 13 of the inner ring assembly 15 during induction heating can be appropriately restrained.
When the coefficient of linear expansion of the base resin exceeds the above 50 × 10 ^-6 / ° C (for example, when it is 51 × 10 ^-6 / ° C), the inner ring assembly 15 is restrained by induction heating. When the temperature of the jig 1 (roller restraint surface 2) rises to 200 ° C., the relational expression D <A "does not hold, so that the cylindrical roller 13 of the inner ring assembly 15 during induction heating can be properly restrained. It will be difficult.

Although the roller restraint jig 1 and the shrink fitting method (induction heating method) of the inner ring assembly 15 using the roller restraint jig 1 according to the embodiment of the present invention have been described above, the embodiment of the present invention is described. The present invention is not limited to this, and appropriate changes can be made without departing from the gist of the present invention.

For example, if the roller restraint surface 2 provided on the inner peripheral surface of the roller restraint jig 1 can appropriately restrain the cylindrical roller 13 of the inner ring assembly 15 when the inner ring assembly 15 is induced and heated, the above-mentioned It is also possible to configure it with a cylindrical surface having a constant diameter instead of the tapered shape. However, if the roller restraint surface 2 is composed of a cylindrical surface having a constant diameter, it is necessary to control the diameter dimension of the roller restraint surface 2 extremely precisely. However, when the roller restraint surface 2 has a tapered shape as described above, Since it is sufficient that the cylindrical roller 13 can be constrained at an arbitrary position in the axial direction of the roller restraint surface 2, there is an advantage that the dimensional control of the roller restraint surface 2 can be facilitated.

Further, the roller restraint jig 1 is made of an insulating material other than the resin material, for example, ceramics, as long as the cylindrical roller 13 of the inner ring assembly 15 can be appropriately restrained by the roller restraint surface 2 provided on the inner peripheral surface. It is also possible.

1 Roller restraint jig 2 Roller restraint surface 2a (Roller restraint surface) One end in the axial direction 2b (Roller restraint surface) The other end in the axial direction 3 Roller guide surface 10 Cylindrical roller bearing 11 Outer ring 12 Inner ring 12a Inner raceway surface 12b Bearing 13 Cylindrical roller 14 Cage (punching cage)
14c Pocket 14d Engagement piece 15 Inner ring assembly

Claims (5)

A copper punching cage containing a steel cylindrical roller is assembled to each of the plurality of pockets on the outer circumference of the steel inner ring having the inner raceway surface and the annular flanges provided on both sides thereof in the axial direction. An inner ring assembly made of steel, in which an engaging piece that is radially engaged with the cylindrical roller housed in each pocket portion induces and heats the inner ring assembly provided in the punching cage. , A jig made of an insulating material that is fitted to the outer circumference of the inner ring assembly.
A roller characterized by having an annular roller restraining surface that restrains each cylindrical roller in a non-contact state with the engaging piece by pressurizing the cylindrical roller accommodated in each pocket portion in the radial direction. Restraint jig. The roller restraint jig according to claim 1, wherein the roller restraint surface is formed in a tapered shape in which the diameter is gradually reduced from one side in the axial direction to the other side. It has an annular roller guide surface that is tapered from one side in the axial direction to the other side and has a larger inclination angle with respect to the axial direction than the roller restraint surface, and the other side in the axial direction of the roller guide surface. The roller restraint jig according to claim 2, wherein the end portion of the roller restraint surface is connected to the end portion on one side in the axial direction of the roller restraint surface. The invention according to any one of claims 1 to 3, wherein the insulating material is a resin material based on a thermoplastic resin having a linear expansion coefficient of 50 × 10 ^-6 / ° C. or lower and a melting point of 250 ° C. or higher. Ring jig. A brass punching cage containing steel cylindrical rollers is assembled to the outer circumference of a steel inner ring having an annular flange portion provided on the inner raceway surface and both sides thereof in the axial direction. An inner ring assembly in which an engaging piece that is radially engaged with the cylindrical roller housed in each pocket portion is provided on the punching cage with respect to the rotating shaft. When shrink-fitting,
By pressurizing the cylindrical roller housed in each pocket portion inward in the radial direction, a roller restraining jig made of an insulating material that restrains each cylindrical roller in a state of being disengaged from the engaging piece is assembled to the inner ring. A method for shrink-fitting an inner ring assembly, which comprises a heating step of inducing and heating the inner ring assembly in a state of being fitted to the outer periphery of the product.

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