JP2010180953A - Method of assembling split-type retainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To assure connection by a connecting pin in a split-type retainer made of a synthetic resin. <P>SOLUTION: A split-type retainer 18 made of a synthetic resin is structured by connecting a pair of annular split bodies 30 divided in the axial direction with a connecting pin 32 passed through in the axial direction and is provided with a plurality of pockets 28 spaced in the circumferential direction to accommodate balls 16 of a roller bearing 10. A method of assembling the split-type retainer includes a process in which the connecting pin 32 made of the synthetic resin is inserted into through holes 34 penetrating each split body 30 in the axial direction and a process in which at least one end of the connecting pin 32 is melted to form a head 38a that engages with a peripheral edge 34a of an opening of the through holes 34. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for assembling a split cage.

In general, a rolling bearing is composed of an inner ring having an inner ring raceway surface, an outer ring having an outer ring raceway surface facing the outer peripheral side of the inner ring raceway surface, and a plurality of rolling elements arranged between the inner ring raceway surface and the outer ring raceway surface. A moving body and a cage that holds the circumferential spacing of the plurality of rolling elements are provided.
Among these, the cage includes a plurality of pockets for accommodating rolling elements at intervals in the circumferential direction, and is classified into a punching die, a punching die, a crown die, and the like depending on the form and shape of manufacture. Further, as described in Patent Document 1, it is a machined type retainer that is divided into two divided bodies at the center in the axial direction, and each divided body is connected to each other by rivets. A cage is also known.
For example, as shown in FIG. 6, such a split type retainer inserts a rivet 150 with a head 149 into a through-hole 134 that penetrates two split bodies 130, and attaches a tip 151 of the rivet 150 to a hammer or the like. Assembled by caulking in.

Japanese Utility Model Publication No. 6-73442

  As the rolling bearing, a metal cage or a synthetic resin cage is used depending on the use environment. When the split type cage is made of a synthetic resin, a washer 152 is provided at the tip of the rivet 150 in order to prevent the split body 130 from being overloaded when the rivet 150 is crimped as shown in FIG. It is attached.

  However, the cage made of synthetic resin is softer than the metal washer 152 and cannot support the washer 152 firmly and firmly from the back surface. Therefore, when the tip of the rivet 150 is strongly driven, the washer 152 May break. Further, if the driving force of the rivet 150 is weakened so that the washer 152 is not broken, the head 149 of the rivet 150 is lifted, and the connection of the divided bodies 130 becomes incomplete. Therefore, in order to securely connect the divided bodies 130, it is necessary to appropriately adjust the caulking degree of the rivet 150, and there is a problem that the assembling work becomes complicated.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide an assembling method that can easily and reliably connect divided bodies in a synthetic resin divided cage. With the goal.

The present invention is configured by connecting a pair of annular divided bodies divided in the axial direction by connecting pins inserted in the axial direction, and a plurality of pockets for accommodating the rolling elements of the rolling bearing. A method for assembling a split cage made of synthetic resin with a gap in the circumferential direction,
Inserting a synthetic resin connecting pin into a through-hole penetrating each divided body in the axial direction;
And melting the at least one end portion of the connecting pin to form a head portion that engages with the peripheral edge of the opening of the through hole at the one end portion.

  According to the assembling method of the present invention, at least one end portion of the connecting pin is melted, and a head portion that engages with the opening peripheral edge of the through hole is formed at the one end portion. There are no problems such as damage to the washer or insufficient connection of the divided bodies, and the divided bodies can be connected easily and reliably.

The present invention further includes a step of melting and chamfering the peripheral edge of the opening of the through hole as a step before inserting the connecting pin into the through hole.
When the opening periphery of the through hole is melted, the edge of the opening periphery is chamfered. When one end of the connecting pin is melted, the head is formed according to the shape of the chamfered opening periphery, so that the base of the head has a smooth shape (see, for example, FIG. 4). This makes it difficult for stress to concentrate on the base portion of the head, preventing damage to the connecting pins and enhancing durability.

  Further, the present invention is characterized in that one end of the connecting pin is melted by laser irradiation. Since the laser can irradiate a narrow range with a high power density, even a small-diameter member such as a connecting pin can be appropriately melted.

  Further, the present invention is characterized in that the laser irradiation range is a range including the peripheral edge of the through hole. As a result, the peripheral edge of the opening of the through hole can be melted at one time to be chamfered.

  According to the assembling method of the split cage of the present invention, the synthetic resin split bodies can be easily and reliably connected by the connecting pins.

It is sectional drawing of the rolling bearing provided with the split-type cage which concerns on embodiment of this invention. It is a front view of the holder | retainer shown by FIG. FIG. 3 is an A arrow view of FIG. 2. It is a BB arrow sectional view of Drawing 3. It is sectional drawing which shows the procedure which joins the front-end | tip part of a connection pin to a holder | retainer. It is sectional drawing of the split-type cage which concerns on a prior art.

Next, modes for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a rolling bearing provided with a split cage according to an embodiment of the present invention.
The rolling bearing 10 includes an inner ring 12, an outer ring 14 that is concentrically arranged on the outer side in the radial direction of the inner ring 12, a plurality of rolling elements 16 that are arranged to be able to roll between the inner ring 12 and the outer ring 14, and a plurality of rolling elements 16. And a retainer 18 that holds the circumferential spacing of the rolling elements 16.

  This rolling bearing 10 is a deep groove ball bearing, and an inner ring raceway surface 20 having a concave arc shape in section is formed on the outer circumferential surface of the inner ring 12 so that balls as rolling elements 16 roll. A concave arc-shaped outer ring raceway surface 22 on which the balls 16 roll is formed on the inner peripheral surface of the outer ring 14.

  2 is a front view of the cage, FIG. 3 is a view taken along arrow A in FIG. 2, and FIG. 4 is a cross-sectional view taken along line BB in FIG. The cage 18 is formed in an annular shape from a synthetic resin such as a phenolic resin. As shown in FIG. 3, the cage 18 includes an annular main portion 24 provided on both sides in the axial direction and a main portion 24 on both sides in the axial direction. And a column portion 26 formed so as to be spanned. A plurality of column portions 26 are provided at equal intervals in the circumferential direction, and pockets 28 for holding the rolling elements 16 are formed between the plurality of column portions 26.

  The cage 18 is divided into two annular divided bodies 30 at the center in the axial direction, and the two divided bodies 30 are connected to each other by a connecting pin 32. Specifically, the retainer 18 is divided into two at the axial central portion of the column portion 26, so that each divided body 30 has one main portion 24 and an axially inner portion from the main portion 24. And a half column portion 26 (divided column portion) protruding in the direction.

  Further, as shown in FIG. 4, a through-hole 34 penetrating in the axial direction is formed in the column portion 26 of each divided body 30. When the column parts 26 of each divided body 30 are brought into contact with each other, the through holes 34 communicate with each other, whereby the connecting pin 32 can be passed through both the divided bodies 30.

As shown in FIG. 4, the connecting pin 32 is formed of the same synthetic resin as that of the divided body 30. The connection pin 32 is a headed pin having a head 36 having a diameter larger than that of the through hole 34 at one end in the axial direction. The connecting pin 32 is inserted into the through hole 34 from the other end portion (tip portion 38) side in the axial direction, and the head portion 38a is engaged with the opening peripheral edge of the through hole 34 at the tip portion 38 by a procedure described later. Is formed.
A counterbore 40 for accommodating the heads 36 and 38a of the connecting pin 32 is formed on both end surfaces of the cage 18 in the axial direction. This counterbore 40 is open radially inward.

FIG. 5 is a cross-sectional view showing a procedure for melting the tip portion 38 of the connecting pin 32 and joining it to the cage.
As shown in FIG. 5A, first, a laser is irradiated to the opening peripheral edge 34a of the through hole 34 in one divided body 30 to melt the opening peripheral edge 34a. By this melting, the corners of the opening peripheral edge 34a are taken and the chamfered state is obtained. The laser irradiation range R is a range including the entire opening peripheral edge 34 a of the through hole 34.

Next, as shown in FIG. 5B, the connecting pin 32 is inserted into the through hole 34, and the distal end portion 38 of the connecting pin 32 is protruded from the through hole 34.
And as shown in FIG.5 (c), a laser is irradiated toward the front-end | tip part 38 of the connection pin 32, and the front-end | tip part 38 of the connection pin 32 is fuse | melted. The distal end portion 38 of the connecting pin 32 expands radially outward by being melted, and covers the opening peripheral edge 34 a of the through hole 34. Further, the opening peripheral edge 34 a of the through hole 34 is also melted at the same time and welded to the tip end portion 38 of the connecting pin 32. The head portion 38a is formed by solidifying the tip portion 38 of the connecting pin 32 over time, and the head portion 38a is firmly engaged with the opening peripheral edge 34a of the through hole 34.

  Therefore, in this embodiment, it is not necessary to drive and rivet the rivets to connect the divided bodies 30 as in the prior art (see FIG. 6), and no washers are required. The body 30 can be connected easily and reliably. In addition, the laser has a high output density and can be irradiated in a narrow range by reducing the beam diameter with a condensing lens. Therefore, the laser is optimal for melting a small-diameter component such as the connecting pin 32. Moreover, since the deformation | transformation and distortion of the division body 30 by laser irradiation are also small, there is little influence on the roundness of a holder | retainer.

  Moreover, since the opening peripheral edge 34a of the through-hole 34 is chamfered by being melted, the base portion of the head 38a can be formed into a smooth shape suitable for the opening peripheral edge 34a. Therefore, it is difficult for stress to concentrate on the base portion of the head portion 38a, the connection pin 32 can be prevented from being damaged from the base portion of the head portion 38a, and the durability of the connection pin 32 can be improved.

  In the above embodiment, the connecting pin 32 may be formed of a light-transmitting synthetic resin capable of transmitting a laser, and the divided body 30 may be formed of a synthetic resin capable of absorbing a laser. Good. In this case, the laser passes through the inside of the connecting pin 32 to reach the inner peripheral surface of the through hole 34, melts the inner peripheral surface of the through hole 34, and also melts the outer peripheral surface of the connecting pin 32. It becomes possible to weld the inside of the through-hole 34 over a wide range in the longitudinal direction, and the bonding strength can be increased.

  The present invention is not limited to the embodiment described above, and various modifications can be made. For example, other means such as an electron beam may be used as a means for melting the connecting pin 32 instead of the laser. The electron beam can irradiate the sandwiched area with a high power density like a laser. However, a laser is more preferably used because it has advantages such as being capable of being irradiated in the atmosphere and not being affected by a magnetic field as compared with an electron beam.

  The cage 18 is divided into two at the center in the axial direction. However, for example, the cage 18 may be divided at the boundary portion between the one main portion 24 and the column portion 26. The connecting pin 32 may form a head by melting both ends. The cage 18 and the connecting pin 32 are not limited to the same material, and may be made of different materials as long as they can be welded to each other. Moreover, this invention can be employ | adopted as an assembly method of not only a deep groove ball bearing but the split-type cage of other rolling bearings.

DESCRIPTION OF SYMBOLS 10 Rolling bearing 18 Cage 28 Pocket 30 Divided body 32 Connection pin 34 Through-hole 34a Opening periphery 38 Tip part 38a Head

Claims (4)

A pair of annular segments divided into two in the axial direction are connected by connecting pins inserted in the axial direction, and a plurality of pockets for accommodating the rolling elements of the rolling bearing are circumferentially spaced. A method for assembling a split cage made of synthetic resin with an opening,
Inserting a synthetic resin connecting pin into a through-hole penetrating each divided body in the axial direction;
A method of assembling the split type cage, comprising: melting at least one end portion of the connecting pin to form a head portion engaged with the peripheral edge of the opening of the through hole at the one end portion.   The method of assembling a split type retainer according to claim 1, further comprising a step of melting and chamfering the peripheral edge of the opening of the through hole as a step before inserting the connecting pin into the through hole. .   The method of assembling a split type retainer according to claim 1 or 2, wherein one end of the connecting pin is melted by laser irradiation.   4. The method of assembling a split-type cage according to claim 3, wherein a laser irradiation range is a range including the peripheral edge of the through hole.

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