JP2012229783A - Angular contact ball bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide angular contact ball bearings that can be piled up without using cages and without damaging balls.SOLUTION: The angular contact ball bearing 10 includes: an outer ring 11 having a raceway 11a on its inner circumferential surface; an inner ring 12 having a raceway 12a on its outer circumferential surface, and a plurality of balls 13 freely rolling between the raceways 11a and 12a with a contact angle α. The axial center positions of the outer and inner rings 11 and 12 are axially offset, and parts of the outer and inner rings 11 and 12 are configured to be overlapped, seen from a radial direction. The size B1 in the axial direction of the outer ring 11 is set larger than the diameter size D of the ball 13, and then the ball 13 is not protruded axially outside from both end surfaces in the axial direction of the outer ring 11.

Description

  The present invention relates to an angular ball bearing, and more particularly to a high load capacity angular ball bearing that supports a rotating shaft of various heavy machinery devices.

  As shown in FIG. 5, the conventional angular contact ball bearing 30 has an outer ring 31 provided with a raceway surface 31a on the inner peripheral surface, an inner ring 32 provided with a raceway surface 32a on the outer peripheral surface, and a raceway between the raceway surfaces 31a and 32a. A plurality of balls 33 that are movably provided. This type of bearing is incorporated in various heavy machinery devices such as industrial robots and speed reducers for construction machinery.

  In recent years, along with the reduction in size and weight of these heavy machinery devices, this type of bearing has been required not only to reduce the cost but also to reduce the weight of the bearing. And aiming at cost reduction and weight reduction, compared with the axial direction dimension of the angular ball bearing 30, reducing the axial direction dimension of the outer ring 31 and the inner ring 32 is performed. Thereby, since the axial direction dimension of the outer ring 31 and the inner ring 32 becomes narrow, a part of the ball 33 protrudes from the axial end surface of the outer ring 31 or the inner ring 32.

  On the other hand, when manufacturing this type of bearing, particularly in the assembly process and the transport process, a plurality of assembled angular ball bearings 30 are stacked in the axial direction. There is a possibility that the surface of the ball 33 may be damaged by the protruding portion of the ball contacting the outer ring 31 or the inner ring 32 of the mating counterpart.

  Therefore, in order to prevent the occurrence of this scratch, a conventional angular ball bearing is known in which angular ball bearings are stacked with a cage as a support during storage and transportation (see, for example, Patent Document 1).

JP 2008-39069 A

  However, in the angular ball bearing described in Patent Document 1, since the stacked angular ball bearings are supported by the cage, a large load is applied to the cage, which is not preferable in terms of strength of the cage. Moreover, since the angular ball bearing described in Patent Document 1 is premised on stacking with a cage, the degree of freedom in designing the cage has been limited.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the angular ball bearing which can pile up an angular ball bearing, without using a cage | basket and not damaging a ball | bowl. is there.

The above object of the present invention can be achieved by the following constitution.
(1) An outer ring having a raceway surface on the inner circumferential surface, an inner ring having a raceway surface on the outer circumferential surface, and a contact angle between the raceway surface of the outer ring and the raceway surface of the inner ring. An angular ball bearing comprising a plurality of balls, wherein an axial center position of the outer ring and an axial center position of the inner ring are offset in the axial direction, and a part of the outer ring and the inner ring overlap when viewed from the radial direction. An angular ball bearing characterized in that the axial dimension of the outer ring is set larger than the diameter dimension of the ball, and the ball does not protrude axially outward from both axial end surfaces of the outer ring.
(2) An outer ring having a raceway surface on the inner circumferential surface, an inner ring having a raceway surface on the outer circumferential surface, and a contact angle between the raceway surface of the outer ring and the raceway surface of the inner ring. An angular ball bearing comprising a plurality of balls, wherein an axial center position of the outer ring and an axial center position of the inner ring are offset in the axial direction, and a part of the outer ring and the inner ring overlap when viewed from the radial direction. The axial dimension of the inner ring is set larger than the diameter dimension of the ball, and the ball does not protrude outward in the axial direction from both axial end surfaces of the inner ring.

  According to the present invention, the axial dimension of the outer ring or inner ring is set larger than the diameter dimension of the ball, and the balls do not protrude axially outward from both axial end surfaces of the outer ring or inner ring. Is supported by the outer ring or the inner ring. Thereby, angular ball bearings can be stacked without using a cage and damaging the balls.

It is a principal part expanded sectional view explaining 1st Embodiment of the angular ball bearing which concerns on this invention. It is a principal part expanded sectional view of the state which accumulated the angular ball bearing shown in FIG. It is a principal part expanded sectional view explaining 2nd Embodiment of the angular ball bearing which concerns on this invention. It is a principal part expanded sectional view of the state which accumulated the angular ball bearing shown in FIG. It is a principal part expanded sectional view for demonstrating the conventional angular contact ball bearing. It is a principal part expanded sectional view of the state which accumulated the angular ball bearing shown in FIG.

  Hereinafter, each embodiment of an angular contact ball bearing concerning the present invention is described in detail based on a drawing.

(First embodiment)
First, with reference to FIG.1 and FIG.2, 1st Embodiment of the angular ball bearing which concerns on this invention is described.

  As shown in FIG. 1, the angular ball bearing 10 of the present embodiment is a thin-walled angular ball bearing having a counter bore shape having a raceway surface 11 a on the inner peripheral surface (a shape having no shoulder on one axial direction side). ) Outer ring 11, a counterbore-shaped inner ring 12 having a raceway surface 12a on the outer peripheral surface, and a plurality of balls 13 provided with a contact angle α between the raceway surfaces 11a and 12a so as to be freely rollable. Moreover, the outer ring | wheel 11, the inner ring | wheel 12, and the ball | bowl 13 are manufactured using steel, such as high chromium carbide bearing steel, steel for carburized bearing, stainless steel for rolling bearings.

  Further, the outer ring 11 and the inner ring 12 are shortened in axial direction on the counterbore side so that the axial center position C1 of the outer ring 11 and the axial center position C2 of the inner ring 12 are offset in the axial direction. In FIG. 1, the outer ring 11 and the inner ring 12 are assembled so that the outer ring 11 and the inner ring 12 are overlapped when viewed from the radial direction.

  In the present embodiment, the axial dimension B <b> 1 of the outer ring 11 is set larger than the diameter dimension D of the ball 13. Accordingly, the balls 13 are prevented from projecting axially outward from both axial end surfaces of the outer ring 11. The axial dimension B2 of the inner ring 12 is set smaller than the axial dimension B1 of the outer ring 11 and the diameter dimension D of the ball 13.

  Further, shoulder portions 11b and 12b are formed at the lower end portion in the axial direction of the outer ring 11 and the upper end portion in the axial direction of the inner ring 12, respectively. The axial dimension B4 of the shoulder portion 12b of the inner ring 12 is the axial direction of the outer ring 11. It is set smaller than the value obtained by subtracting the diameter dimension D of the ball 13 from the dimension B1. When the radial dimensions of the shoulder portions 11b and 12b are the same, the axial dimension B4 of the shoulder portion 12b of the inner ring 12 may be set smaller than the axial dimension B3 of the shoulder portion 11b of the outer ring 11.

  In the angular ball bearing 10 configured as described above, for example, when two angular ball bearings 10 are stacked, as shown in FIG. 2, the upper angular ball ball is placed on the outer ring 11 of the lower angular ball bearing 10. The outer ring 11 of the bearing 10 is placed, and the upper angular ball bearing 10 is supported by the outer ring 11 of the lower angular ball bearing 10. Further, since the inner ring 12 of the lower angular ball bearing 10 does not contact the ball 13 of the upper angular ball bearing 10, the ball 13 is not damaged.

  As described above, according to the angular ball bearing 10 of the present embodiment, the axial dimension B1 of the outer ring 11 is set to be larger than the diameter dimension D of the ball 13, and the ball 13 extends from both axial end surfaces of the outer ring 11. Since it does not protrude outward in the axial direction, the outer ring 11 supports the bearings 10 when they are stacked. Thereby, the angular ball bearings 10 can be stacked without damaging the balls 13. Moreover, since a cage is not used for stacking the bearings 10, the degree of freedom in designing the cage can be improved.

(Second Embodiment)
Next, with reference to FIG.3 and FIG.4, 2nd Embodiment of the angular ball bearing which concerns on this invention is described. Note that the same or equivalent parts as those in the first embodiment are given the same or equivalent reference numerals in the drawings, and the description thereof is omitted or simplified.

  In the angular ball bearing 20 of the present embodiment, as shown in FIG. 3, the outer ring 11 and the inner ring 12 are shortened in the axial dimension on the counterbore side, whereby the axial center position C1 of the outer ring 11 and the inner ring 12 are reduced. As shown in FIG. 3, the outer ring 11 and the inner ring 12 are partially overlapped with each other so that they are offset in the axial direction (in FIG. 3, the inner ring 12 is positioned below). It has been.

  Further, in the present embodiment, the axial dimension B <b> 2 of the inner ring 12 is set larger than the diameter dimension D of the ball 13. Thereby, the ball 13 is prevented from protruding outward in the axial direction from both axial end surfaces of the inner ring 12. The axial dimension B1 of the outer ring 11 is set smaller than the axial dimension B2 of the inner ring 12 and the diameter dimension D of the ball 13.

  Further, shoulder portions 11b and 12b are formed on the upper end portion in the axial direction of the outer ring 11 and the lower end portion in the axial direction of the inner ring 12, respectively. The axial dimension B3 of the shoulder portion 11b of the outer ring 11 is the axial direction of the inner ring 12. It is set smaller than the value obtained by subtracting the diameter dimension D of the ball 13 from the dimension B2. When the radial dimensions of the shoulder portions 11b and 12b are equal, the axial dimension B3 of the shoulder portion 11b of the outer ring 11 may be set smaller than the axial dimension B4 of the shoulder portion 12b of the inner ring 12.

  In the angular ball bearing 20 configured as described above, for example, when two angular ball bearings 20 are stacked, as shown in FIG. 4, the upper angular ball bearing 20 is placed on the inner ring 12 of the lower angular ball bearing 20. The inner ring 12 of the bearing 20 is placed, and the upper angular ball bearing 20 is supported by the inner ring 12 of the lower angular ball bearing 20. Further, since the outer ring 11 of the lower angular ball bearing 20 does not contact the ball 13 of the upper angular ball bearing 20, the ball 13 is not damaged.

As described above, according to the angular ball bearing 20 of the present embodiment, the axial dimension B2 of the inner ring 12 is set to be larger than the diameter dimension D of the ball 13, and the ball 13 extends from both axial end surfaces of the inner ring 12. Since it does not protrude outward in the axial direction, the inner ring 12 supports the bearings 20 when they are stacked. Thereby, the angular ball bearings 20 can be stacked without damaging the balls 13. Moreover, since a cage is not used for stacking the bearings 20, the degree of freedom in designing the cage can be improved.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

  In addition, this invention is not limited to what was illustrated by said each embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

10, 20 Angular contact ball bearing 11 Outer ring 11a Raceway surface 12 Inner ring 12a Raceway surface 13 Ball B1 Axial dimension of outer ring B2 Axial dimension of inner ring D Diameter of ball α Contact angle

Claims (2)

An outer ring provided with a raceway surface on the inner peripheral surface, an inner ring provided with a raceway surface on the outer peripheral surface, and a rolling angle with a contact angle between the raceway surface of the outer ring and the raceway surface of the inner ring. A plurality of balls, and
An angular ball bearing in which the axial center position of the outer ring and the axial center position of the inner ring are offset in the axial direction, and a part of the outer ring and the inner ring overlap when viewed from the radial direction,
The axial dimension of the outer ring is set larger than the diameter dimension of the ball,
The angular ball bearing characterized in that the balls do not protrude axially outward from both axial end surfaces of the outer ring. An outer ring provided with a raceway surface on the inner peripheral surface, an inner ring provided with a raceway surface on the outer peripheral surface, and a rolling angle with a contact angle between the raceway surface of the outer ring and the raceway surface of the inner ring. A plurality of balls, and
An angular ball bearing in which the axial center position of the outer ring and the axial center position of the inner ring are offset in the axial direction, and a part of the outer ring and the inner ring overlap when viewed from the radial direction,
The axial dimension of the inner ring is set larger than the diameter dimension of the ball,
The angular ball bearing characterized in that the balls do not protrude axially outward from both axial end surfaces of the inner ring.

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