JP2009052616A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing, reducing the frictional force between a cage and a regulating member and preventing edge contact to restrain abrasion and heating value between the resin-made cage and the regulating member. <P>SOLUTION: This rolling bearing 10 includes: the resin-made cage 14 retaining a plurality of rolling elements 13 disposed to roll at the substantially equal spaces in the circumferential direction between an outer ring raceway surface 11a of an outer ring 11 and an inner raceway surface 12a of an inner ring 12; and a regulating member 19 fitted in the axial end of the outer ring 11 to regulate the axial movement of the cage 14. The cage 14 has a protrusive curved surface part 20 in a part opposite to the regulating member 19 in the axial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing including a resin cage.

  An example of a conventional rolling bearing is shown in FIG. The rolling bearing shown in FIG. 6 includes an outer ring 1 having an outer ring raceway surface 1a on an inner peripheral surface, an inner ring 2 having an inner ring raceway surface 2a on an outer peripheral surface and disposed coaxially with the outer ring 1, an outer ring raceway surface 1a and an inner ring. A ball 3 that is a plurality of rolling elements disposed so as to be able to roll between the raceway surface 2a and a cage 4 that holds the plurality of balls 3 so as to be able to roll at equal intervals in the circumferential direction. .

  The cage 4 has an annular main portion 5 and claw portions 6 extending in the axial direction from one axial end portion of the main portion 5 and arranged at a plurality of positions at equal intervals in the circumferential direction. A pocket portion is formed between the claw portions 6 and 6 adjacent to each other in the circumferential direction so as to hold the ball 3 in a rollable manner. In addition, in the example shown in FIG. 6, it is set as the rolling element guide system in which the holder | retainer 4 is guided with the ball | bowl 3. FIG.

  Here, due to thermal expansion or centrifugal force at the time of high-speed rotation of the bearing, the cage 4 is deformed and the opening side (claw portion 6) of the pocket portion extends beyond the diameter of the ball 3, or the claw portion 6 is damaged. As a result, there is a risk that the retainer may come off. In order to eliminate such inconvenience, it is proposed to attach a regulating member 7 for regulating the movement of the cage 4 in the axial direction to the end of the outer ring 1 or the inner ring 2 on the main portion 5 side of the cage 4. (For example, refer to Patent Document 1).

By restricting the movement of the cage 4 in the axial direction by the regulating member 7, the axial length of the claw portion 6 of the cage 4 can be shortened and retained by thermal expansion or centrifugal force during high-speed rotation of the bearing. It becomes possible to suppress the deformation of the vessel 4.
JP-A 63-92819

  However, in the rolling bearing disclosed in Patent Document 1, when the main portion 5 of the cage 4 collides with the restricting member 7, the main portion 5 and the restricting member 7 come into surface contact with each other to generate a large frictional force. Further, as shown in FIG. 7, when the cage 4 is inclined, edge contact occurs between the main portion 5 of the cage 4 and the regulating member 7. For this reason, the amount of wear and the amount of heat generated between the main portion 5 of the cage 4 and the regulating member 7 increase, and the strength of the resin cage may be deteriorated. Further, as shown in FIG. 8, the same problem occurs when the bearing ring guide system is formed by forming the flange portion 8 in contact with the inner peripheral surface of the outer ring 1 on the outer peripheral side of the main portion 5 of the cage 4. obtain.

  The present invention has been made in order to eliminate such inconveniences, and an object of the present invention is to reduce the frictional force between the cage and the regulating member and prevent edge contact, thereby making a resin cage. An object of the present invention is to provide a rolling bearing capable of suppressing the amount of wear and the amount of heat generated between the control member and the regulating member.

The above object of the present invention is achieved by the following configurations.
(1) An outer ring, an inner ring arranged coaxially with the outer ring, a plurality of rolling elements arranged to roll between the outer ring and the inner ring, and the plurality of rolling elements in a circumferential direction A rolling bearing comprising: a resin cage that is held at substantially equal intervals; and a regulating member that is attached to the outer ring or the inner ring and regulates axial movement of the cage. A rolling bearing characterized in that a convex curved surface portion is formed at a portion of the cage facing in the axial direction.
(2) The retainer includes an annular main portion, and a plurality of claw portions that are arranged at substantially equal intervals in the circumferential direction at the axial end portion of the main portion and project in the axial direction. A pocket portion is formed between the claw portions adjacent to each other in the circumferential direction so as to hold the rolling element in a rollable manner, and the main portion is disposed to face the regulating member in the axial direction. The rolling bearing according to (1), which is characterized.

  According to the rolling bearing of the present invention, the convex curved surface portion is formed in the portion of the cage that faces the regulating member in the axial direction. Therefore, when the cage collides with the regulating member, the cage and the regulating member are regulated. The member substantially becomes a line contact or a point contact, so that the frictional force between the cage and the regulating member can be reduced, and even when the cage is inclined, the edge of the cage is the regulating member. Can be avoided. Thereby, the abrasion amount and the emitted-heat amount between a cage | basket and a control member can be suppressed, and the strength deterioration of resin-made cage | baskets can be prevented.

Hereinafter, an embodiment of a deep groove ball bearing according to the present invention will be described in detail with reference to the drawings.
1 is a cross-sectional view of a main part for explaining an embodiment of a rolling bearing according to the present invention. FIG. 2 is a cross-sectional view of a main part showing a state in which the cage is inclined in the rolling bearing shown in FIG. FIG. 5 is a cross-sectional view of an essential part for explaining a modification of the rolling bearing shown in FIG.

  As shown in FIG. 1, the rolling bearing 10 of the present embodiment includes an outer ring 11 having an outer ring raceway surface 11 a on an inner peripheral surface, and an inner ring 12 having an inner ring raceway surface 12 a on an outer peripheral surface and disposed coaxially with the outer ring 11. And a plurality of balls (rolling elements) 13 disposed so as to be able to roll between the outer ring raceway surface 11a and the inner ring raceway surface 12a, and the plurality of balls 13 are held so as to be able to roll at equal intervals in the circumferential direction. The resin cage 14 made of resin.

  The cage 14 includes an annular main portion 15 and a plurality of claw portions 16 that are arranged at equal intervals in the circumferential direction at one axial end of the main portion 15 and project in the axial direction. This is a so-called crown-shaped cage in which a pocket portion for holding the ball 13 so as to roll is formed between the claw portions 16 and 16 adjacent to each other in the circumferential direction. Further, the main portion 15 of the retainer 14 is formed with a convex curved surface portion 20 protruding outward in the axial direction at the other end portion of the axial end portion where the claw portions 16 are formed.

  Examples of the resin material forming the cage 14 include polyamide resins such as 46 nylon and 66 nylon, polybutylene terephthalate, polyphenylene sulfide (PPS), polyamideimide (PAI), thermoplastic polyimide, polyetheretherketone (PEEK), A polyether nitrile (PEN) etc. can be illustrated. Moreover, the rigidity and dimensional accuracy of the cage | basket 14 can be improved by adding suitably 10-50 weight% of fibrous fillers, such as glass fiber and carbon fiber, to above-described resin.

  An annular recess 18 is formed along the circumferential direction on the axial end surface of the outer ring 12 on the main portion 15 side of the cage 14. A shield plate (regulating member) 19 that prevents the retainer 14 from coming off by restricting the axial movement of the retainer 14 is attached to the annular recess 18, and the shield plate 19 is attached to the retainer 14. Oppositely arranged in the axial direction with respect to the convex curved surface portion 20 formed in the main portion 15. The material of the shield plate 19 is not particularly limited. For example, iron, steel, spring steel, or the like can be used.

  Therefore, according to the rolling bearing 10 of the present embodiment, the convex curved surface portion 20 is formed in the main portion 15 of the cage 14 that is opposed to the shield plate 19 in the axial direction, and therefore the main portion 15 of the cage 14. When the bumps collide with the shield plate 19, the convex curved surface portion 20 and the shield plate 19 are substantially in line contact, and the frictional force between the cage 14 and the shield plate 19 can be reduced. As shown in FIG. 2, even when the cage 14 is inclined, it is possible to avoid the edge of the main portion 15 of the cage 14 from hitting the shield plate 19, and the convex curved surface portion 20 and the shield plate 19 are It becomes a point contact substantially, and the frictional force between the holder | retainer 14 and the shield board 19 can be reduced.

  Thereby, the abrasion amount and the emitted-heat amount between the holder | retainer 14 and the shield board 19 can be suppressed, and the strength deterioration of the resin-made holder | retainer 14 can be suppressed.

  In addition, since the convex curved surface portion 20 is formed in the main portion 15 of the cage 14, the clearance space between the cage 14 and the shield plate 19 can be increased. For this reason, lubricating oil can easily enter between the cage 14 and the shield plate 19, the lubricity of the contact portion between the convex curved surface portion 20 and the shield plate 19 is improved, and the frictional force can be further reduced. .

  Then, by restricting the movement of the cage 14 in the axial direction by the shield plate 19, the axial length of the claw portion 16 of the cage 14 can be shortened, and thermal expansion and centrifugal force during high-speed rotation of the bearing can be achieved. It is possible to suppress the deformation of the cage 14 due to the above, and thereby it is possible to ensure uniform rotation of the cage 14 and prevent vibration and noise.

  In addition, this invention is not limited to what was illustrated by one Embodiment mentioned above, In the range which does not deviate from the summary of this invention, it can change suitably.

  For example, in the above embodiment, the case where the present invention is applied to the rolling element guide type rolling bearing 10 in which the cage 14 is guided by the balls 13 is illustrated, but instead of this, a first modification shown in FIG. As described above, even if the present invention is applied to a rolling bearing in which the flange portion 21 that contacts the inner peripheral surface of the outer ring 11 is formed on the outer peripheral side of the main portion 15 of the cage 14 and the bearing ring guide system is used, An effect can be obtained.

  Moreover, in the said embodiment, although the opposing surface with the convex-curved surface part 20 employ | adopted the flat shield plate 19 as a control member, the shape of a control member is not specifically limited, For example, the 2nd modification shown in FIG. As described above, a shield plate 23 having a curved surface portion 22 that is concave toward the convex curved surface portion 20 with a slightly larger radius of curvature than the convex curved surface portion 20 formed in the main portion 15 of the cage 14 may be employed.

  Furthermore, in the said embodiment, although the shield board 19 was employ | adopted as a control member, you may replace with this and may use the spring washer 24 as a control member like the 3rd modification shown in FIG.

  Furthermore, in the said embodiment, although the case where the shield plate 19 as a control member was attached to the axial direction edge part of the outer ring 11 supposing the inner ring rotation rolling bearing 10 was illustrated, in the case of the outer ring rotation rolling bearing, By attaching a regulating member such as the shield plate 19 to the end portion in the axial direction of the inner ring 12, the same effect as described above can be obtained.

It is principal part sectional drawing for demonstrating one Embodiment of the rolling bearing which concerns on this invention. In the rolling bearing shown in FIG. 1, it is principal part sectional drawing which shows the state which the holder | retainer inclined. It is principal part sectional drawing for demonstrating the 1st modification of the rolling bearing shown in FIG. It is principal part sectional drawing for demonstrating the 2nd modification of the rolling bearing shown in FIG. It is principal part sectional drawing for demonstrating the 3rd modification of the rolling bearing shown in FIG. It is principal part sectional drawing for demonstrating an example of the conventional rolling bearing. FIG. 7 is a cross-sectional view of a main part showing a state in which the cage is inclined in the rolling bearing shown in FIG. 6. It is principal part sectional drawing for demonstrating the other example of the conventional rolling bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rolling bearing 11 Outer ring 11a Outer ring raceway surface 12 Inner ring 12a Inner ring raceway surface 13 Ball (rolling element)
14 Crown type cage 15 Main part 16 Claw part 19 Shield plate (regulating member)
20 Convex surface

Claims (2)

An outer ring, an inner ring arranged coaxially with the outer ring, a plurality of rolling elements arranged to roll between the outer ring and the inner ring, and the plurality of rolling elements at substantially equal intervals in the circumferential direction A rolling bearing comprising: a resin-made cage that is held in a holding member; and a regulating member that is attached to the outer ring or the inner ring and regulates movement in the axial direction of the cage,
A rolling bearing, wherein a convex curved surface portion is formed at a portion of the retainer facing the regulating member in the axial direction.   The retainer has an annular main portion, and a plurality of claw portions that are arranged at substantially equal intervals in the circumferential direction at the axial end portion of the main portion and project in the axial direction. A pocket portion is formed between the claw portions adjacent to each other so as to hold the rolling element in a rollable manner, and the main portion is disposed opposite to the regulating member in the axial direction. The rolling bearing according to claim 1.

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