JP2015203474A - Angular ball bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angular ball bearing that is less likely to generate seizure even when used at high rotational speed, and has a long service life.SOLUTION: On a guide surface 11 to be the inner peripheral surface of an outer ring 1 on one side of an axial direction, an outer ring guide type holder 4 is guided by sliding the outer peripheral surface of a guide surface side annular part 41 of the holder 4, and to a non-guide surface 12 to be the inner peripheral surface of the outer ring 1 on the other end side of the axial direction, the outer peripheral surface of a non-guide side annular part 42 of the holder 4 closely faces. A clearance T between the non-guide surface 12 of the outer ring 1 and the outer peripheral surface of the non-guide side annular part 42 is 0.9% or more and 8% or less with respect to an inner diameter D of the non-guide surface 12.

Description

  The present invention relates to an angular ball bearing in which seals are attached to both ends in the axial direction and grease is sealed inside.

  2. Description of the Related Art In recent years, angular ball bearings with seals in which grease is sealed in advance and sealed with seals are used as angular ball bearings that support the rotating shafts of electric compressors and electric blowers of automobiles. Since such an electric compressor (rolling bearing device) is generally used at a high rotational speed of tens of thousands to hundreds of thousands of rpm, the grease existing on the raceway surface and the cage is removed by the centrifugal force or the like, Easily flows out into the groove shoulder of the outer ring. As a result, when the grease for lubricating the rolling elements and the raceway surface is insufficient and the lubrication is poor, there is a possibility that slip occurs between the rolling elements and the raceway surface and seizure occurs, resulting in a decrease in bearing life. Therefore, the rolling bearing as described above has been required to prevent seizure.

  As a prior art for improvement of this portion, Patent Document 1 discloses that in an angular contact ball bearing, a raceway is formed on the inner diameter portion of the outer ring for the purpose of improving the fluidity of grease and stably ensuring the lubricity of the bearing. A configuration is described in which a grease storage groove connected to the groove is formed and a grease guide surface is formed on the groove wall of the grease storage groove. During operation, the grease stored in the grease storage groove is stably supplied to the race groove of the outer ring along the grease guide surface by the wind pressure generated by the rotation of the outer ring guide cage, and the lubricity of the bearing is stably secured.

JP 2010-164122 A

  However, in this prior art, excessive accumulation of grease in the storage groove may cause the bearing to generate heat during high-speed rotation, resulting in a short life of the bearing. In addition, since the grease storage groove is formed, the height of the groove shoulder of the raceway groove is lowered, and there is a possibility that the ball as the rolling element rides on the groove shoulder. Furthermore, since the area of the guide surface of the cage guided by the outer ring is small, the surface pressure of the guide surface increases, and the cage may be significantly worn.

  An object of the present invention is to solve the above-described problems of the prior art and to provide a long-life angular ball bearing that is less likely to seize even when used at a high rotational speed.

In order to solve the above problems, an angular contact ball bearing of the present invention includes an inner ring having an inner ring raceway surface on an outer peripheral surface, an outer ring having an outer ring raceway surface on an inner peripheral surface, and an outer ring raceway surface and an inner ring raceway surface. Arranged in a space formed by a plurality of balls arranged, a cage that holds the plurality of balls slidably, seals attached to both ends of the outer ring in the axial direction, an inner ring, an outer ring, and a seal An angular ball bearing having grease, and having the following configurations (1) to (2).
(1) The cage is guided by the inner peripheral surface on one end side in the axial direction of the outer ring, and the clearance between the inner peripheral surface on the other end side in the axial direction of the outer ring and the outer peripheral surface of the retainer is 0.9 of the inner diameter of the outer ring. % Or more and 8% or less.

(2) One or more synthetic resins in which the cage is selected from polyamide 46, polyamide 66, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), and polyether ether ketone (PEEK), and glass fiber or carbon It is obtained by melt-molding a resin composition comprising a fibrous filler composed of fibers and having a fibrous filler content of 10 mass% or more and 40 mass% or less.

The angular ball bearing of the present invention has the above-described configuration (1), so that the grease is prevented from flowing out to the seal portion or the groove shoulder portion of the outer ring by high-speed rotation, and the grease can be easily retained on the raceway surface and the cage. Thus, the durability of the bearing can be improved.
Specifically, if the gap between the inner peripheral surface on the other axial end side of the outer ring and the outer peripheral surface of the cage is less than 0.9% of the inner diameter of the outer ring, the cage and the outer ring interfere with each other, The rotational torque increases due to friction and heat is easily generated. When the gap is larger than 8%, the effect of suppressing the grease from flowing out to the seal portion or the groove shoulder portion of the outer ring cannot be sufficiently exhibited.

  The angular contact ball bearing of the present invention has a long life because seizure hardly occurs even when used at a high rotational speed.

Sectional drawing which shows the angular ball bearing of 1st Embodiment. Sectional drawing which shows the angular ball bearing of 2nd Embodiment.

Hereinafter, although an embodiment of the present invention is described, the present invention is not limited to the following embodiment.
[First Embodiment]
As shown in FIG. 1, the angular ball bearing of this embodiment includes an outer ring 1, an inner ring 2, a ball 3, a cage 4, and non-contact seals 5 and 6.
An outer ring raceway surface 10 is formed on the inner peripheral surface of the outer ring 1, and an inner ring raceway surface 20 is formed on the outer peripheral surface of the inner ring 2. A plurality of balls 3 that are rolling elements are arranged between the outer ring raceway surface 10 and the inner ring raceway surface 20.

  The groove shoulder on one end side in the axial direction of the inner ring 2 (left side in FIG. 1) is dropped, with the inner ring raceway surface 20 of the inner ring 2 being sandwiched, the one end side in the axial direction is the shoulder drop portion 21 and the other end side in the axial direction (see FIG. 1) is the groove shoulder 22. The axial dimension of the outer ring 1 is smaller than the axial dimension of the inner ring 2, and the axial end of the groove shoulder 22 of the inner ring 2 protrudes from the axial end of the outer ring 1.

Mounting grooves 15 and 16 for mounting the non-contact seals 5 and 6 are formed at both axial ends of the inner peripheral surface of the outer ring 1. The non-contact seals 5 and 6 formed by pressing the metal plate are press-fitted and fixed in the mounting grooves 15 and 16, respectively, and the inner peripheral edge is closely opposed to the outer peripheral surface of the inner ring 2.
In the annular space formed by the inner peripheral surface of the outer ring 1, the outer peripheral surface of the inner ring 2, the side surface of the non-contact seal 5, and the side surface of the non-contact seal 6, each track surface 10. Grease (not shown) for lubricating 20 and the rolling surface of the ball 3 is enclosed.

The cage 4 is made of an annular body having a predetermined thickness, and has a plurality of circular pockets 40 penetrating the circumferential surface of the annular body in the radial direction at predetermined intervals in the circumferential direction. Each pocket 40 holds the ball 3 so as to roll freely.
The retainer 4 is an outer ring guide type, and is guided by sliding the outer peripheral surface of the guide-side annular portion 41 of the retainer 4 on the guide surface 11 which is the inner peripheral surface on one axial end side of the outer ring 1. . On the other hand, on the opposite side of the guide surface 11 across the outer ring raceway surface 10, the outer periphery of the non-guide-side annular portion 42 of the cage 4 is connected to the non-guide surface 12 which is the inner peripheral surface on the other axial end side of the outer ring 1. The faces are close to each other.
The cage 4 is obtained by melt-molding a resin composition (polyether ether ketone (PEEK) and carbon fiber content of 30% by mass of carbon fiber).

  Regarding the size of the inner diameter of the outer ring 1, the inner diameter of the non-guide surface 12 that is a cylindrical surface is formed larger than the inner diameter of the guide surface 11 that is a cylindrical surface. Accordingly, the outer diameter of the non-guide-side annular portion 42 is formed larger than the outer diameter of the guide-side annular portion 41 with respect to the outer diameter of the cage 4. The outer diameter dimension of the cage 4 changes in the axially central portion (the portion overlapping the outer ring raceway surface 10). The outer peripheral surface of the guide-side annular portion 41 and the outer peripheral surface of the non-guide-side annular portion 42 Each has a cylindrical surface shape.

In the angular ball bearing of the present embodiment, the clearance T between the non-guide surface 12 of the outer ring 1 and the outer peripheral surface of the non-guide side annular portion 42 is 0.9% or more of the inner diameter D of the non-guide surface 12 and 8 % Or less. With this configuration, the cage 4 that rotates at a high speed suppresses the grease stored in the raceway surfaces 10 and 20 and the cage 4 from flowing out to the seal portion or the groove shoulder, and the raceway surfaces 10 and 20 and the retainer. Grease can be kept in the vessel 4. Therefore, it is possible to provide a long-life angular ball bearing that maintains good lubrication of the raceway surfaces 10 and 20 and the rolling surface of the balls 3 and is less likely to seize.
Further, since the gap T is 0.9% or more of the inner diameter D of the non-guide surface 12, the non-guide surface 12 and the non-guide side annular portion 42 do not contact each other, and the rotational torque does not increase due to friction. . Further, since the gap T is set to 8% or less of the inner diameter D of the non-guide surface 12, the grease is prevented from passing through the gap T and flowing out to the seal portion or the groove shoulder portion of the outer ring 1.

For example, in the case of an angular ball bearing having an inner ring inner diameter of 8 mm and an outer ring outer diameter of 22 mm, D = 16 mm, and the gap T is in the range of 0.14 to 1.28 mm.
The cage 4 is not limited to the materials described above, and is selected from polyamide 46, polyamide 66, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), and polyetheretherketone (PEEK). Melting and molding a resin composition composed of one or more synthetic resins and a fibrous filler made of glass fiber or carbon fiber, wherein the fibrous filler content is 10 mass% or more and 40 mass% or less. Can also be obtained.

[Second Embodiment]
FIG. 2 shows a second embodiment of the present invention. In the angular ball bearing of this embodiment, with respect to the cage 4a, the outer diameter of the guide-side annular portion 41 and the outer diameter of the non-guide-side annular portion 42a are equal, and the outer circumferential surface of the cage 4a has an outer diameter dimension. It is a single cylindrical surface shape that is constant. On the other hand, by setting the inner diameter of the non-guide surface 12a of the outer ring 1a to be smaller than the inner diameter of the non-guide surface 12 of the first embodiment, the gap between the non-guide surface 12a and the outer peripheral surface of the non-guide side annular portion 42a. T is set to 0.9% or more and 8% or less of the inner diameter D of the non-guide surface 12a.
Other configurations and operational effects are the same as those of the first embodiment described above.

  The angular ball bearing of the present invention can be suitably used as a rolling bearing that supports the rotating shaft of an electric compressor and an electric blower of an automobile.

DESCRIPTION OF SYMBOLS 1,1a Outer ring 10 Outer ring raceway surface 11 Guide surface 12, 12a Non-guide surface 15 Mounting groove 16 Mounting groove 2 Inner ring 20 Inner ring raceway surface 21 Shoulder drop part 22 Groove shoulder part 3 Ball 4, 4a Cage 40 Pocket 41 Guide side circle Ring part 42, 42a Non-guide side ring part 5 Non-contact seal 6 Non-contact seal

Claims (2)

An inner ring having an inner ring raceway surface on an outer peripheral surface, an outer ring having an outer ring raceway surface on an inner peripheral surface, a plurality of balls disposed between the outer ring raceway surface and the inner ring raceway surface, and rolling the plurality of balls. A cage that is movably held; seals attached to both ends in the axial direction of the outer ring; and grease disposed in a space formed by the inner ring, the outer ring, and the seal;
The cage is guided by an inner circumferential surface on one end side in the axial direction of the outer ring, and a gap between the inner circumferential surface on the other end side in the axial direction of the outer ring and the outer circumferential surface of the cage is 0% of the inner diameter of the outer ring. Angular contact ball bearing characterized by being 9% or more and 8% or less. The cage is made of one or more synthetic resins selected from polyamide 46, polyamide 66, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), and polyether ether ketone (PEEK), and glass fiber or carbon fiber. The fibrous filler is obtained by melt-molding a resin composition having a fibrous filler content of 10% by mass or more and 40% by mass or less. Item 2. An angular ball bearing according to item 1.

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