JP2018179049A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing capable of suppressing deformation even in the increase in size and speed of a bearing.SOLUTION: A rolling bearing includes: an outer ring; an inner ring; rolling elements provided between the outer ring and the inner ring; and a retainer for retaining the rolling elements in a state of having an interval with each other in a circumferential direction. The retainer includes: a resin retainer body which has an annular base part, a pillar part raised on one side in an axial direction from the base part and an elastic piece provided at a tip of the pillar part, and in which pockets for storing the rolling elements are formed by the base part, the pillar part and the elastic piece; and a reinforcement plate which has an annular base bottom part and a pillar-like part raised on one side in the axial direction from the base bottom part, which is substantially a cylindrical shape as a whole and made to be a comb-shaped plate-like body. The reinforcement plate is integrally embedded in the retainer body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to, for example, a rolling bearing suitable for supporting a rotary shaft of an integrated starter generator in which an engine accessory of a motor vehicle, in particular, an integrated starter / generator having a function of a motor and a function of a generator are integrated.

  Conventionally, a crank pulley fixed to an end of a crankshaft using rotational power of an engine, a driven pulley provided in an auxiliary device such as a compressor used for an air conditioner for an automobile, the crank pulley and the camshaft Between a cam pulley fixed to the end of the belt, a endless belt, a timing belt, a chain etc. (hereinafter collectively referred to simply as a "belt") and a torque transmission mechanism is used to transmit torque. (See FIG. 6 described later).

  FIG. 5 shows an example of an alternator 100, which is a kind of such an accessory, described in Patent Document 1. As shown in FIG. As shown in FIG. 5, the rotating shaft 103 is rotatably supported by a casing 102 attached to a vehicle body (cylinder block) via a pair of bearings 110, 110 (deep groove ball bearings). A rotor 105 and a commutator 106 are integrally provided at an intermediate portion of the rotating shaft 103. Further, a driven pulley 107 is fixed to a portion of the end of the rotary shaft 103 (left end in FIG. 5) which protrudes out of the casing 102.

  The driven pulley 107 is engaged with the rotary shaft 103 by screwing a nut 109 having a female screw 109a formed on the inner periphery into an external thread portion 103a formed at the one end of the rotary shaft 103 and screwing it in the axial direction. It is attached to rotate integrally. In a state where the alternator 100 is assembled to the vehicle body, the belt is passed over the driven pulley 107, and the rotation shaft 103 is freely rotatable by the crankshaft of the engine.

  Although not shown, the deep groove ball bearing 110 arranges rolling elements 116 (balls) provided between the outer ring 112 and the inner ring 114 as a bearing ring with a predetermined interval in the circumferential direction. Have a cage for As such a cage, generally, a metal press cage or a resin crown-type cage (see FIG. 7 described later) is used.

  Although the alternator 100 described above has a function as a generator that charges a battery by supplying power to the battery, in recent years, an integrated starter generator (hereinafter simply referred to simply as an integrated function as a motor when starting an automobile) It may be called "starter generator". FIG. 6 shows an example of a rotational force transmission mechanism employing such an integrated starter generator 200 described in Patent Document 2. As shown in FIG.

  In the background, a vehicle equipped with an idling stop function that automatically shuts off the engine when the vehicle is stopped, such as waiting for a signal, and restarts the engine when starting, in anticipation of fuel savings and carbon dioxide emission reduction effects. However, there is a situation that is increasing. In the case of a vehicle equipped with such an idling stop function, it is general to operate the engine using a starter motor at vehicle start and restart the engine from idling stop using an alternator. It is. However, in order to make such configuration more complicated, integrated starter generators have been introduced which integrate the functions of a motor (starter motor) and a generator (alternator).

  In the rotational force transfer mechanism 230 shown in FIG. 6, a crankshaft pulley 234a is fixed to a crankshaft 234 connected to a piston (not shown) in the engine 232. A belt 240 is used to transmit the rotational force of the crankshaft 234 to the rotating shafts of the accessories such as the starter / generator 200 and the air conditioner compressor 236. That is, a pulley 200a is provided on the rotation shaft 200b of the starter / generator 200, and a compressor pulley 236a is provided on the main body of the air conditioner compressor 236 so as to be integrally rotatable with the rotation shaft 236b. The crankshaft pulley 234a and the pulleys 200a, By the belt 240 being stretched between 236a, the rotational force of the crankshaft 234 is transmitted to each of the rotation shafts 200b and 236b. Reference numerals 238 and 238 denote a pair of tension pulleys for applying tension to the belt 240.

  By employing such a starter / generator 200, the functions of the conventional generator and motor are integrated to prevent the configuration from being complicated. By the way, in such a starter generator 200, since it is necessary to transmit a large rotational force to rotate the crankshaft 234 and the flywheel (not shown) at the time of restart from the idling stop time, the tension of the belt 240 is It is set to high. In order to withstand such tension, the rolling bearing that supports the rotating shaft of the starter / generator is increased in bearing size from the viewpoint of securing the life. When the bearing size is increased in this way, if the rotational speed of the rotary shaft is the same as the conventional one, the centrifugal force acting on the cage holding the rolling elements at a predetermined interval increases, and thus the centrifugal force Countermeasures against

  FIG. 7 shows an example of a crown-type cage with improved rigidity described in Patent Document 3. As shown in FIG. The crown retainer 318 has a retainer body 322 and a metal plate 324. The retainer main body 322 has an annular portion 322a and a column portion 322b, and a pair of elastic pieces 322c and 322c are formed at the tip of the column portion 322b. A pocket 322d is formed by the annular portion 322a, the column portion 322b, and the elastic piece 322c, and the ball 316 as a rolling element is accommodated in the pocket 322d. A metal plate 324 is integrally provided by adhesion or the like on the side opposite to the side on which the pocket 322 d of the annular portion 322 a is formed and in the axial direction (left and right direction in FIG. 7). Since the metal plate 324 is integrally provided, the rigidity of the annular portion 322a is improved, whereby the column 322b is rotated even if the crown type cage 318 rotates in the direction of the arrow C and the centrifugal force acts. The diameter expansion of the tip, that is, the deformation in the arrow R direction is prevented.

  However, in the vehicle provided with the idling stop function described above, when employing the starter / generator, as described above, in order to cope with a large belt tension, it is necessary to make the bearing larger than conventional. Such a starter generator is also required to rotate at high speed since it functions as a generator as in the prior art when the vehicle is traveling. Therefore, the deformation suppression technology in the crown type cage used for rolling bearings to cope with such enlargement and speeding up avoids contact of the cage with the bearing ring and accommodates the ball at a predetermined position in the pocket. It becomes an important technology to secure the lubrication performance.

JP 2008-223910 A JP, 2015-63922, A Unexamined-Japanese-Patent No. 8-145061

  An object of the present invention is to provide a rolling bearing capable of suppressing deformation even when the size and speed of the bearing are increased, in view of the above-mentioned circumstances.

In order to achieve the above object, a rolling bearing according to the present invention is configured as follows.
(1) Outer ring,
With the inner ring,
Rolling elements provided between the outer ring and the inner ring;
A cage for holding the rolling elements circumferentially in a mutually spaced state;
In a rolling bearing having
The cage is
The rolling element includes an annular base, a column rising from the base to one side in the axial direction, and an elastic piece provided at the tip of the column, the base, the column, and the elastic piece, the rolling element And a resin retainer body having a pocket formed therein for housing the
And a reinforcing plate having a substantially cylindrical shape and a comb-like plate-like body, having an annular base portion and a columnar portion raised from the base portion to one side in the axial direction. ,
The rolling bearing in which the reinforcing plate is integrally embedded in the cage body.
(2) The rolling bearing according to (1), wherein the base portion and the columnar portion of the reinforcing plate have substantially the same width.
(3) The rolling bearing according to the above (1) or (2), wherein the width of the columnar portion on the tip side in the axial direction is wider than that of the base portion.
(4) The rolling bearing according to the above (1) to (3), wherein the reinforcing plate is made of metal.

  According to the present invention, the cage has the cage body made of resin and the reinforcing plate in the form of a substantially cylindrical plate, and the reinforcing plate is integrally embedded in the cage body, Since the retainer body made of resin is reinforced by the reinforcing plate, it is possible to obtain a rolling bearing capable of suppressing deformation even when the size and speed of the bearing are increased.

It is a sectional view of a rolling bearing concerning an embodiment of the present invention. It is a perspective view which takes out and shows the holder | retainer of FIG. It is a perspective view which takes out and shows the reinforcement board which comprises a holder. It is a reference perspective view of the holder | retainer main body in the case where it does not have a reinforcement board in FIG. It is sectional drawing of the alternator as an example of an auxiliary machine. It is a reference drawing showing an example of a torque transfer mechanism provided with a starter generator. It is a perspective view which shows an example of the prior art example of a crown type holder.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. FIG. 1 is a cross-sectional view of a rolling bearing according to an embodiment of the present invention, FIG. 2 is a perspective view showing a cage taken out, and FIG. 3 is a perspective view of a reinforcing plate constituting the cage. FIG. 4 is a reference view and is a perspective view of the cage main body in the case where the reinforcing plate is not provided in FIG.

  The rolling bearing 10 (hereinafter simply referred to as "bearing") is, for example, for supporting the rotating shaft 103 shown in FIG. 5 and is a single-row deep groove ball bearing. The rolling bearing 10 includes an outer ring 12 as a fixed side bearing ring, an inner ring 14 as a rotating side bearing ring, and a plurality of rolling elements 16 disposed rollably between the outer ring 12 and the inner ring 14. , A holder 18 for holding the rolling element 16 and a pair of seal members 20, 20.

  The outer ring 12 is preferably made of bearing steel (for example, SUJ2), and an outer ring raceway groove 12a is formed on the inner peripheral surface. Further, seal grooves 12b, 12b for attaching the seal members 20, 20 are formed at both end portions in the axial direction (left and right direction in FIG. 1).

  The inner ring 14 is preferably made of bearing steel (for example, SUJ2), and an inner ring raceway groove 14a facing the outer ring raceway groove 12a is formed on the outer peripheral surface. The inner peripheral surface is cylindrical and fixed to the rotation shaft.

  The balls 16 as rolling elements are preferably made of bearing steel (for example, SUJ2), and are disposed rollably between the outer ring raceway groove 12a and the inner ring raceway groove 14a.

  The cage 18 is a crown cage having a plurality of balls 16 arranged at substantially equal intervals in the circumferential direction, and one end side (right side in FIG. 1) of the axial direction is open. As shown in FIG. 2, the cage 18 is a cage made of synthetic resin such as nylon 46, nylon 66, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), etc. 22 and a reinforcing plate 24, preferably made of metal.

  As shown in FIG. 4, the retainer main body 22 has an annular base 22a, a column 22b raised from the base 22a to one side in the axial direction, and an elastic piece provided at the tip of the column 22b. 22c, and a pocket 22d for accommodating the ball 16 is formed by the base 22a, the column 22b and the elastic piece 22c.

  As shown in FIG. 3, the reinforcing plate 24 has an annular base portion 24 a and a columnar portion 24 b raised from the base portion 24 a to one side in the axial direction, and the whole is substantially cylindrical. It is a comb-shaped plate. When manufacturing the reinforcing plate 24, a comb-like member obtained by expanding the state of FIG. 3 in the circumferential direction is punched out of a steel plate such as a cold-rolled steel plate by press forming, and the comb-like member is bent into a cylindrical shape. Later, the end faces are butted together and integrated by welding or the like. At this time, when the portion to be the base portion 24a of the reinforcing plate and the portion to be the columnar portion 24b have substantially the same width, it is possible to suppress local deformation at the time of press molding.

  In addition, when manufacturing the cage 18, after applying an adhesive to the surface of the reinforcing plate 24, the reinforcing plate 24 is set in a mold and insert-molded by an injection molding machine to reinforce the resin. Mold integrally on the plate 24. In such a method, the retainer 18 shown in FIG. 2 is produced so that the metal reinforcing plate 24 is embedded in the resin retainer body 22. In particular, the pillar portion 22b of the cage main body is reinforced by embedding the pillar portion 24b corresponding to the comb of the comb-like reinforcing plate 24 in the pillar portion 22b of the cage main body 22, and the arrow R in FIG. The radially outward deformation of the elastic piece 22c as shown in FIG.

  Furthermore, when the width of the columnar portion 24b of the reinforcing plate 24 is wider at the tip end side (right side in FIG. 2) with respect to the base portion 24a side, the reinforcing plate 24 from the cage main body 22 in FIG. It is possible to prevent it from coming out.

  Returning to FIG. 1, the pair of seal members 20, 20 each have a metal cored bar 20a and an elastic member 20b integral with the cored core 20a and provided with a seal lip portion 20c on the inner diameter side. The outer diameter side of the member 20 is integrally fixed to the outer ring 12 by engaging with the seal groove 12 b formed on the inner circumference of the outer ring.

  Next, the operation of the bearing 10 will be described.

In the bearing 10 of this embodiment, the outer ring 12 is attached to, for example, a casing of a starter generator (see a casing 102 in FIG. 5), and the inner ring is integrally attached to a rotation shaft (see a rotation shaft 103 in FIG. 5) used. When the rotational force of the crankshaft in the engine is transmitted to the driven pulley (see the pulley 107 in FIG. 5) via the rotational force transmission mechanism, the belt tension is increased as described above, so that the driven pulley is A high load acts on the rotating shaft via the shaft, and the rotating shaft rotates at high speed. The bearing 10 is upsized in order to support a high load, and by rotating at a high speed, the centrifugal force more than conventional acts on the rolling element 16 and the cage 18 constituting the bearing 10 respectively.

  However, in the present embodiment, the reinforcing plate 24 which is a substantially cylindrical and comb-like plate-like body as a whole is embedded in the cage main body 22, and the columnar portion 24 b of the reinforcing plate 24 is the cage main body. Since the column 22b of 22 is reinforced, the rod 22b and the elastic piece 22c at the tip are suppressed from being deformed radially outward. Further, since the reinforcing plate 24 has a substantially cylindrical shape and is a comb-like plate-like body and is made slim and compact, the weight increase of the cage 18 is suppressed and the increase of the centrifugal force is suppressed.

  As described above, according to the present embodiment, the cage 18 has the cage body 22 made of resin, and the reinforcing plate 24 formed in a substantially cylindrical, comb-like plate-like body, and the reinforcing plate Since 24 is integrally embedded in the cage body 22, the resin cage body 22 is reinforced by the reinforcing plate 24, so that deformation can be suppressed even when the bearing is made larger and faster. A rolling bearing can be obtained.

  In addition, the rolling bearing of this invention is not limited to what was illustrated to the said embodiment, It can change suitably in the range which does not deviate from the summary of this invention. For example, the application needs to support not only applications supporting the rotating shaft of the starter / generator but also high load and high speed rotation such as applications supporting the rotating shaft such as a compressor for air conditioners of automobile engine accessories It can also be used for such applications.

  The reinforcing plate is not limited to metal, and may be made of synthetic resin such as nylon 46, nylon 66, PPS, PTFE, PEEK reinforced with carbon fiber or the like.

DESCRIPTION OF SYMBOLS 10 rolling bearing 12 outer ring 14 inner ring 16 ball 18 cage | basket 20 seal 22 cage | basket body 22a base 22b pillar part 22c elastic piece 22d pocket 24 reinforcement board 24
24a base portion 24b columnar portion

Claims (4)

Outer ring,
With the inner ring,
Rolling elements provided between the outer ring and the inner ring;
A cage for holding the rolling elements circumferentially in a mutually spaced state;
In a rolling bearing having
The cage is
The rolling element includes an annular base, a column rising from the base to one side in the axial direction, and an elastic piece provided at the tip of the column, the base, the column, and the elastic piece, the rolling element And a resin retainer body having a pocket formed therein for housing the
And a reinforcing plate having a substantially cylindrical shape and a comb-like plate-like body, having an annular base portion and a columnar portion raised from the base portion to one side in the axial direction. ,
The rolling bearing characterized in that the reinforcing plate is integrally embedded in the cage body.   The rolling bearing according to claim 1, wherein the base portion and the columnar portion of the reinforcing plate have substantially the same width.   The rolling bearing according to claim 1 or 2, wherein a width of an axial tip end side of the columnar portion is wider than a width of the base side. The rolling bearing according to any one of claims 1 to 3, wherein the reinforcing plate is made of metal.

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