JP2017048834A - Waveform cage and ball bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveform cage which can use a large-sized rivet while avoiding the interference of a caulking jig and the cage in a rivet caulking process, and a ball bearing.SOLUTION: A waveform cage has a plurality of recessed pocket parts for holding balls, and flat plate parts for connecting the pocket parts, and also comprises a pair of annular members in which the pocket parts and the flat plate parts are alternately formed in a peripheral direction, and rivets for connecting the flat plate parts of a pair of the annular members to each other in a state that the recessed pocket parts oppose each other. Penetration holes which the rivets penetrate are formed at the flat plate parts, and peripheral edges of the penetration holes are set thick in thicknesses with respect to peripheral-edge peripheral parts.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a corrugated cage and a ball bearing provided with the corrugated cage, and more particularly, to a corrugated cage used in a bearing for an electrical equipment / auxiliary machine of an automobile and a ball bearing provided with the corrugated cage.

  2. Description of the Related Art Conventionally, car air conditioners mounted on automobiles are generally configured to operate by driving the compressor by transmitting the rotational power of the engine to an electromagnetic clutch by a belt and connecting the clutch.

  In recent years, there has been an increasing demand for reduction of carbon dioxide emission due to global warming, and in automobiles, the specific gravity of hybrid cars, electric cars, and fuel cell cars is increasing compared to conventional gasoline cars. In these hybrid vehicles and the like, since the engine is not always rotating, it is necessary to take measures when the engine is not rotating, for example, when the car air conditioner is operated by the power of the engine.

  For this reason, instead of the conventional method of driving the compressor with the rotational power of the engine, an electric compressor that drives the compressor with an electric motor has been adopted. When the electric motor is driven, for example, a scroll type compressor can be made more compact. That is, conventionally, a predetermined amount of refrigerant gas has to be supplied even when the engine speed is low, so the discharge amount has to be large. On the other hand, in the case of an electric compressor, the number of rotations of the scroll can be controlled arbitrarily, so that it is sufficient that the necessary amount of refrigerant gas can be supplied when necessary as a car air conditioner, and the discharge amount is small. Can be suppressed. An example of such an electric compressor is disclosed in Patent Document 1, for example.

  FIG. 5 is a diagram showing the configuration of the electric compressor disclosed in Patent Document 1. As shown in FIG. An eccentric shaft 120 is provided at the right end of the drive shaft 107 integral with the rotor 114 of the motor 115 in the drawing. A bush 121 is fitted and fixed to the eccentric shaft 120, and a bearing (ball bearing) 123 is provided between the outer periphery of the bush 121 and the movable scroll body 122. A plurality of compression chambers 126 are formed between the movable spiral wall 125 formed on the movable scroll body 122 and the fixed spiral wall 118 formed on the fixed scroll body 116, and the movable scroll body 122 performs a swiveling motion. The compressed refrigerant gas is discharged from the discharge port 140.

  The ball bearing 123 can be used instead of a needle bearing (see, for example, Patent Document 2) because of the severe load conditions. This is because when a compressor is driven by the rotational power of an engine in the past, a large-capacity refrigerant gas has to be supplied, so a needle bearing with a large load capacity has been adopted. This is because the discharge amount can be suppressed to a small capacity as described above, and it is not necessary to use a bearing having a large load capacity.

  However, since the tip of the eccentric shaft 120 is free and is supported in a single-sided state with respect to the drive shaft 107, the tip of the eccentric shaft 120 is easily deformed. In a state where this deformation is easy, the ball bearing 123 supports the movable scroll body 122 at the tip of the eccentric shaft 120, and the movable scroll body 122 is compressed between the fixed scroll body 116. Since the reaction force from the refrigerant gas thus applied acts in the radial direction, a moment load acts on the ball bearing 123. However, the direction in which this moment load acts is unspecified since the direction of the reaction force acting from the compressed refrigerant gas is not constant.

  For this reason, a state where a load acts intermittently or does not act on each ball (rolling element) occurs. In the case of a bearing that supports both ends of a rotating shaft on which a load is applied, each rolling element is regulated once each from non-load zone to load zone and load zone to non-load zone during one rotation of the rotary shaft. Move on. Compared to such steady rotation, as described above, when a state in which a load is intermittently applied or not applied to each rolling element is generated, a specific rolling element is → There may be a concentration of the transition from the load zone to the load zone to the non-load zone. At the time of this transition, the revolution speed of the rolling element changes abruptly, so that a collision occurs between the rolling element and the cage holding the rolling element.

  As a cage for holding rolling elements, a pair of annular members in which pocket portions and flat plate portions for holding balls are alternately formed in the circumferential direction are provided, and the flat plate portions of the pair of annular members are caulked with rivets. A corrugated cage that couples a pair of annular members in the axial direction by coupling is known (see, for example, Patent Document 3).

  By the way, in the rolling bearing provided with the waveform holder described in the above-mentioned Patent Document 3, as described above, even if a state where a load acts intermittently or does not act on a specific rolling element, a ball is generated. In order to prevent damage to the waveform holder due to a collision between the waveform holder and the waveform holder, it is necessary to improve the strength of the waveform holder as much as possible. In particular, since the rivet is often caulked and deformed, its hardness is relatively lower than that of the annular member. Therefore, it is desirable that the rivet has a slightly larger size (particularly in the radial direction).

JP 2010-148296 A JP 2000-046060 A JP 2008-175300 A

  However, as more compact ball bearings become available, the caulking space that can be used for caulking also becomes smaller, and it is difficult to avoid interference between the caulking jig and the cage in the rivet caulking process. It is difficult to use rivets with large sizes.

  The present invention has been made in view of the above circumstances, and its purpose is to avoid interference between the caulking jig and the cage in the rivet caulking process of the corrugated cage, and use a rivet having a large radial size. An object of the present invention is to provide a corrugated cage and a ball bearing that can be used.

The above object of the present invention can be achieved by the following constitution.
(1) It has a plurality of concave pocket portions for holding balls and flat plate portions connecting the pocket portions, and the pocket portions and the flat plate portions are alternately formed in the circumferential direction. A pair of annular members,
A rivet that joins the flat plate portions of the pair of annular members with the concave pocket portions facing each other;
A waveform holder comprising:
A corrugated cage in which a through hole through which the rivet passes is formed in the flat plate portion, and a peripheral portion of the through hole is thicker than a peripheral portion of the peripheral portion.
(2) An outer ring having an outer ring raceway surface on an inner peripheral surface, an inner ring having an inner ring raceway surface on an outer peripheral surface, and a plurality of balls arranged so as to be able to roll between the outer ring raceway surface and the inner ring raceway surface; A ball bearing that holds the plurality of balls in the circumferential direction at substantially equal intervals,
A ball bearing in which the waveform holder is the waveform holder described in (1).

  According to the present invention, the peripheral edge portion of the rivet hole formed in the flat plate portion of the pair of annular members is thicker than the peripheral edge portion, so that the caulking jig is in front of the interference with the cage, Caulking can be completed, and a large rivet can be used while avoiding interference between the caulking jig and the cage in the rivet caulking process.

It is an expanded sectional view explaining the ball bearing by which one Embodiment of the waveform holder which concerns on this invention was employ | adopted. It is a perspective view of the waveform holder shown in FIG. It is a front view of the rivet periphery part seen from the holder outer diameter side of the waveform holder shown in FIG. It is a front view of the rivet periphery part of the modification of the waveform holder which concerns on this invention. It is explanatory drawing which shows an example of the conventional electric compressor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. The ball bearing 1 of the present embodiment is capable of rolling between an inner ring 2 having an inner ring raceway 2a on an outer peripheral surface, an outer ring 3 having an outer ring raceway 3a on an inner peripheral surface, and the inner ring raceway 2a and the outer ring raceway 3a. A plurality of balls 4 provided, and a cage 5 that holds the balls 4 so as to roll freely.

  Among these, the cage 5 is called a corrugated cage, and is formed by joining a pair of annular members 10 and 10 by a plurality of rivets 20 as shown in FIG.

  The two annular members 10 and 10 are formed into a corrugated annular shape as a whole by punching and bending a metal plate material such as a steel plate and a stainless steel plate with a press. Both the annular members 10 and 10 have partial spherical shell-shaped pocket portions 11 and 11 and flat plate portions 12 and 12 that connect the adjacent pocket portions 11 and 11 to each other. 11 and the flat plate portions 12 and 12 are alternately formed in the circumferential direction. Further, as shown in detail in FIG. 3, through holes 13 and 13 through which the rivets 20 pass are formed in the central portions of the flat plate portions 12 and 12. The peripheral edge portions 14 and 14 of the through holes 13 and 13 are thicker than the peripheral edge peripheral portions 15 and 15 located on the outer side of the peripheral edge portions 14 and 14 in the radial direction of the through hole. In addition, the peripheral part does not necessarily need to be thick over the entire circumference of the through hole.

  The rivet 20 is made of a metal such as steel or stainless steel, and includes a body portion 21, heads 22 positioned at both ends of the body portion 21, and a caulking portion 23. As will be described below, it is preferable that the hardness of the rivet 20 is relatively lower than the hardness of the annular member 10 in order to caulk the rivet 20.

  In the manufacture of the cage 5, first, the flat plate portions 12 and 12 of the annular members 10 and 10 are overlapped with the concave pocket portions 11 and 11 facing each other, and the through holes that are aligned with each other. 13 and 13, the body portion 21 of the rivet 20 having only the head portion 22 passes therethrough, and the other end side of the rivet 20 that is straight is projected from the flat plate portion 12 (two-dot chain line in FIG. 4). See state). Then, the other end side of each trunk | drum 21 is crushed and the crimp part 23 is formed. As a result, the flat plate portions 12 and 12 overlapped with each other are sandwiched and joined between the head portion 22 and the caulking portion 23 of each rivet 20.

  And in this embodiment, since the peripheral part 14 of the through-hole 13 is thicker than the peripheral part peripheral part 15, as shown in FIG. 3, when forming the crimp part 23, it is larger diameter. The rivet 20 can be used. That is, the caulking jigs 30 and 30 can complete caulking before they interfere with the boundary portion 16 between the pocket portion 11 and the flat plate portion 12 of the cage 5. For this reason, it is possible to avoid interference between the caulking jigs 30 and 30 and the boundary portion 16 of the annular member 10 in the rivet caulking process.

  For comparison, FIG. 3 shows a conventional example with a two-dot chain line. In the conventional example, when the same caulking jigs 30 and 30 as in this embodiment are used, the caulking jigs 30 and 30 interfere with the boundary portion 16 between the pocket portion 11 and the flat plate portion 12. The boundary portion 16 cannot be bent in order to avoid stress concentration, cracking during press molding, and the like, and needs to be continuous as smoothly as possible with, for example, a large R dimension. For this reason, caulking jigs 530 and 530 that do not interfere with the boundary portion 16 must be used, but in this case, only rivets 520 having a rivet diameter of φd2 can be used.

  On the other hand, in the present embodiment, since the interference between the caulking jigs 30 and 30 and the boundary portion 16 can be avoided while using the same caulking space, the rivet 20 having a rivet diameter of φd1 can be used. (Φd1> φd2)

  A pocket 17 for holding each ball 4 so as to roll freely is formed by a portion surrounded by the pocket portions 11 and 11 in a joined state between the flat plate portions 12 and 12. As shown in Figure 1. In a state where the ball 4 is accommodated in the pocket 17, a gap is formed between the ball 4 and the pocket 17 in order to allow the ball 4 to freely roll.

  Next, the operation of this embodiment will be described.

  When the ball bearing 1 is used, for example, to support a movable scroll body of an electric compressor as shown in FIG. 5, a moment load acts on the ball bearing 1 as described above. For this reason, each ball 4 is intermittently subjected to a load or not acting, and a relative revolution speed difference occurs between the ball 5 and the ball 5. 5 collision occurs. However, in the ball bearing 1 of the present embodiment, since the pair of annular members 10 are caulked using a rivet 20 having a large size, the strength of the caulking portion is improved as compared with the prior art, and the bearing of the same size is used. If so, it is possible to withstand more severe conditions.

  As described above, according to the ball bearing 1 of the present embodiment, the interference between the caulking jig 30 and the boundary portion 16 of the annular member 10 in the rivet caulking process can be avoided, so that the rivet having a larger size is used. 20 can be used.

  As a modification of the present embodiment, as shown in FIG. 4, the upper end of the head portion 42 of the rivet 40 and the lower end of the caulking portion 43 may be flat surfaces.

  In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably. For example, in the above embodiment, the rivet has a circular cross section, but is not limited thereto, and may be a square.

  Moreover, although the ball bearing demonstrated the example used for the eccentric shaft of a scroll type compressor, for example, it may be applied to the ball bearing which supports a drive shaft like the ball bearings 8 and 9 in FIG. . Further, the present invention can be applied not only to scroll type compressors but also to ball bearings used in vane type and swash plate type compressors. Furthermore, it can be applied not only to electrical equipment bearings but also to auxiliary bearings such as alternators.

DESCRIPTION OF SYMBOLS 1 Ball bearing 2 Inner ring 2a Inner ring raceway surface 3 Outer ring 3a Outer ring raceway surface 4 Ball 5 Corrugated cage 10 Annular member 11 Pocket part 12 Flat plate part 13 Through hole 14 Peripheral part 15 Peripheral part peripheral part 20, 40 Rivet 30 Caulking jig

Claims (2)

A pair of concave pockets for holding balls and a flat plate portion connecting the pocket portions, and the pocket portions and the flat plate portions are alternately formed in the circumferential direction. A corrugated cage comprising an annular member and a rivet that joins the flat plate portions of the pair of annular members with the concave pocket portions facing each other, wherein the rivet penetrates the flat plate portion. A corrugated cage, wherein a through hole is formed, and a peripheral portion of the through hole is thicker than a peripheral portion of the peripheral portion. An outer ring having an outer ring raceway surface on an inner peripheral surface, an inner ring having an inner ring raceway surface on an outer peripheral surface, a plurality of balls that are rotatably arranged between the outer ring raceway surface and the inner ring raceway surface, and the plurality A ball bearing comprising:
The said waveform holder is a waveform holder of Claim 1, The ball bearing characterized by the above-mentioned.

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