A ball bearing

Abstract

The present invention discloses a ball bearing, which includes an inner ring and an outer ring arranged coaxially, and a plurality of rolling elements arranged annularly between the inner ring and the outer ring. The inner ring is composed of an inner ring core and an inner ring cover that are butted end to end and coaxially inserted and connected into one body. An outer groove is provided on the outer circumferential surface of the inner ring after the inner ring core and the inner ring cover are butted. An inner groove is provided on the inner circumferential surface of the outer ring. The rolling elements are placed between the inner groove and the outer groove. A riveting edge for axially fixing the inner ring core and the inner ring cover is provided on the inner ring core. A reinforcement structure for fixing the inner ring is further included to enhance the connection strength between the inner ring core and the inner ring cover. The ball bearing described in the present invention effectively increases the tensile strength of the inner ring of the bearing and improves the bearing performance by adding a reinforcement structure. The ball bearing can be widely applied to electronic products, such as mobile phones, wearable electronic products, etc., providing reliable technical support for the miniaturization trend of electronic products and achieving good results in the balance between performance and cost.

Description

Technical Field

[0001] The present invention relates to a bearing, and more particularly to a ball bearing. Background Art

[0002] As is well known, a watch is a representative of a micro-mechanical device. As Figure 1 shown, in a watch movement, there is such a bearing. The inner ring of a traditional structure bearing, such as a deep groove ball bearing, is divided into two parts, namely an "inner ring core" and an "inner ring cover"; similarly, spherical balls are used as rolling elements, and the rolling track is changed from an arc shape to a V shape. This type of bearing is widely used in watch movements.

[0003] Due to the small size of the ball bearing product, especially the small axial height; compared with the bearing of the traditional structure, this structure is convenient for the machining of parts and the assembly of the bearing. Therefore, it has been widely used in watch movements for over a hundred years.

[0004] In a watch movement, due to the functional structure of the movement and the connection method between the bearing and the movement, it is determined that when the bearing is subjected to an axial load in any direction, the two parts of the inner ring will not become loose.

[0005] However, when the above-mentioned bearing is separately extracted and applied to modern technological products, the bearing structure will cause the two parts of the inner ring to become loose due to the axial tensile force, resulting in the decomposition of the bearing and reducing the reliability of the bearing. Summary of the Invention

[0006] The purpose of the present invention is to provide a ball bearing to solve the technical problems mentioned in the background art.

[0007] To achieve the above purpose, the specific technical solution of a ball bearing of the present invention is as follows:

[0008] A ball bearing includes an inner ring and an outer ring arranged coaxially, and a plurality of rolling elements arranged annularly between the inner ring and the outer ring. The inner ring is composed of an inner ring core and an inner ring cover that are butt-jointed at the end faces and coaxially inserted and connected into one body. An outer groove is provided on the outer circumferential surface of the inner ring after the inner ring core and the inner ring cover are butt-jointed. An inner groove is provided on the inner circumferential surface of the outer ring. The rolling elements are placed between the inner groove and the outer groove. A riveting edge for axially fixing the inner ring core and the inner ring cover is provided on the inner ring core. A reinforcement structure for fixing the inner ring is further included to enhance the connection strength between the inner ring core and the inner ring cover.

[0009] Furthermore, an avoidance groove is provided on the inner ring cover. By applying an external force, the riveting edge is pressed into the avoidance groove to rivet and fix the inner ring core and the inner ring cover.

[0010] Further, the reinforcement structure is an end face cover coaxially arranged with the inner ring. The end face cover is an annular cover. After the inner ring cover and the inner ring core are fixed by riveting, the top surface of the riveting edge is lower than the upper surface of the outer ring. The end face cover is covered in the avoidance groove above the riveting edge, and the inner wall of the end face cover is flush with the inner wall of the inner ring core.

[0011] Further, the end face cover is fixed to the inner ring cover by interference fit, laser welding or screw tightening.

[0012] Further, the reinforcement structure is a locking ring, and the locking ring is placed on the contact surface between the inner ring cover and the inner ring core inside the riveting edge.

[0013] Further, locking grooves are respectively arranged at corresponding positions on the inner circumferential surface of the inner ring cover and the outer circumferential surface of the inner ring core, and the locking ring is sleeved in the locking grooves.

[0014] Further, the reinforcement structure is a fastener. Threaded holes are respectively arranged on the inner ring core and the inner ring cover, and the axis lines of the threaded holes are parallel to the axis line of the bearing. The fastener is screwed into the threaded holes to fix the inner ring core and the inner ring cover.

[0015] Further, the number of the fasteners includes at least two, and the at least two fasteners are evenly distributed on the circumference of the inner ring.

[0016] Further, both the outer groove and the inner groove are groove bodies with a circular arc-shaped, V-shaped or trapezoidal cross-section.

[0017] Further, the rolling elements are balls, and the balls roll in the raceway formed by the inner groove and the outer groove.

[0018] Further, the maximum number of the balls is determined by the size of the raceway and the size of the balls, and the minimum number of the balls is greater than or equal to 1 / 2 of the maximum number of the balls.

[0019] A ball bearing of the present invention has the following advantages:

[0020] The ball bearing of the present invention effectively increases the tensile strength of the inner ring of the bearing and improves the bearing performance by adding a reinforcement structure. The ball bearing can be widely applied to electronic products, such as mobile phones, wearable electronic products, etc., and provides reliable technical support for the miniaturization trend of electronic products, and achieves a good balance between performance and cost. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of a ball bearing in the prior art;

[0022] Figure 2 is a cross-sectional view of the first embodiment of the ball bearing of the present invention;

[0023] Figure 3 Cross-sectional view of the second embodiment of the ball bearing of the present invention;

[0024] Figure 4 Cross-sectional view of the third embodiment of the ball bearing of the present invention.

[0025] Description of reference numerals in the figure: 1, outer ring; 11, inner groove; 2, inner ring core; 21, riveting edge; 3, inner ring cover; 31, avoidance groove; 4, rolling element; 5, end face cover; 6, retaining ring; 7, fastener. Detailed implementation manners

[0026] In order to better understand the purpose, structure and function of the present invention, the following further describes a ball bearing of the present invention in detail with reference to the accompanying drawings.

[0027] As Figure 1 shown, the ball bearing in the prior art includes an inner ring and an outer ring 1 arranged coaxially, and a plurality of rolling elements 4 arranged annularly between the inner ring and the outer ring 1. The inner ring is composed of an inner ring core 2 and an inner ring cover 3 that are butted face to face and coaxially inserted and connected as a whole. The inner ring core 2 and the inner ring cover 3 are annular structures. The inner diameter of the inner ring core 2 is smaller than the inner diameter of the inner ring cover 3. An outer groove is provided on the outer circumferential surface of the inner ring formed after the inner ring core 2 and the inner ring cover 3 are butted. An inner groove 11 is provided on the inner circumferential surface of the outer ring 1. The rolling elements 4 are placed between the inner groove 11 and the outer groove. A riveting edge 21 is provided on the inner ring core 2. After the inner ring core 2 and the inner ring cover 3 are sleeved, the riveting edge 21 is deformed towards the inner ring cover 3 by an external force so that the inner ring core 2 and the inner ring cover 3 are riveted and fixed.

[0028] In order to ensure that the upper and lower surfaces of the inner ring are flat and there is no protruding part after the ball bearing is assembled, an avoidance groove 31 is provided on the inner ring cover 3 to reserve space for the riveting edge 21 of the inner ring core 2. The riveting edge 21 is pressed into the avoidance groove 31 by an external force so that the inner ring core 2 and the inner ring cover 3 are riveted and fixed. Or, the axial dimension of the inner ring formed after the inner ring core 2 and the inner ring cover 3 are combined is smaller than the axial dimension of the outer ring 1, so as to ensure that there is no protruding part on the upper and lower surfaces after the bearing is assembled.

[0029] Both the outer groove and the inner groove 11 are groove bodies with a circular arc-shaped, V-shaped, trapezoidal or other cross-sectional shapes. The rolling elements 4 are balls. The balls can roll in the groove formed by the inner groove 11 and the outer groove. The maximum number of balls is jointly determined by the size of the groove and the size of the balls; theoretically, the minimum number of balls is greater than or equal to half of the maximum number of balls, and the bearing can rotate normally. However, the fewer the number of balls, the larger the gap between the inner ring and the outer ring 1, and the worse the stability of the bearing operation.

[0030] To prevent the inner ring core 2 and the inner ring cover 3 of the ball bearing from detaching during use, the ball bearing further includes a reinforcement structure for the bearing inner ring to enhance the connection strength between the inner ring core 2 and the inner ring cover 3.

[0031] As Figure 2 shown, the reinforcement structure is an end face cover 5 coaxially arranged with the inner ring. The end face cover 5 is an annular cover. After the inner ring cover 3 and the inner ring core 2 are fixed by riveting, the top surface of the riveting edge 21 is lower than the upper surface of the outer ring 1. The end face cover 5 is fitted into the avoidance groove 31 above the riveting edge 21, and the inner wall of the end face cover 5 is flush with the inner wall of the inner ring core 2. After the bearing is assembled and riveted, the end face cover 5 is installed on the inner ring cover 3 so that the inner ring cover 3 and the end face cover 5 clamp the riveting edge of the inner ring core 2, effectively preventing the inner ring core 2 and the inner ring cover 3 from detaching due to the axial force during the use of the bearing.

[0032] The end face cover 5 is fixed to the inner ring cover 3 by interference fit, laser welding, screw tightening, etc. to enhance the connection strength between the inner ring cover 3 and the end face cover 5.

[0033] As another embodiment, as Figure 3 shown, the reinforcement structure is a retaining ring 6, and the retaining ring 6 is placed on the contact surface between the inner ring cover 3 and the inner ring core 2 inside the riveting edge 21.

[0034] [[ID= sixteen]]Retaining grooves are respectively provided at corresponding positions on the inner circumferential surface of the inner ring cover 3 and the outer circumferential surface of the inner ring core 2, and the retaining ring 6 is sleeved in the retaining grooves. During assembly, the retaining ring 6 is sleeved in the retaining groove of the inner ring core 2, the inner ring cover 3 is sleeved on the inner ring core 2 along the axial direction, and the retaining ring 6 is pressed into the retaining groove of the inner ring cover 3, and then the riveting edge 21 is pressed into the avoidance groove 31. The retaining ring 6 acts as a key to lock the inner ring cover 3 and the inner ring core 2 and prevent them from loosening.

[0035] In some application scenarios, the radial dimension of the bearing is large and there is sufficient space to set the reinforcement structure. At this time, as Figure 4 shown, the reinforcement structure can be a fastener 7, and the inner ring core 2 and the inner ring cover 3 are reinforced by the fastener 7. The fastener 7 is a screw, and threaded holes are respectively provided on the inner ring core 2 and the inner ring cover 3. The axis of the threaded hole is parallel to the axis of the bearing, and the screw is tightened in the threaded hole to fix the inner ring core 2 and the inner ring cover 3. Or, the fastener 7 is a rivet, and the inner ring core 2 and the inner ring cover 3 are riveted and fixed.

[0036] The number of the fasteners 7 is at least one. When the number of the fasteners 7 includes at least two, at least two fasteners 7 are evenly distributed on the circumference of the inner ring.

[0037] When fixing the inner ring core 2 and the inner ring cover 3 with the fastener 7, the riveting edge 21 of the inner ring core 2 can be cancelled, simplifying the processing technology of the bearing. While improving the connection strength of the bearing, the assembly efficiency of the bearing is improved.

[0038] By adding a reinforcement structure, the ball bearing effectively improves the connection strength of the bearing while enhancing the assembly efficiency. The tensile strength of the inner ring of the bearing is increased, improving the bearing performance. The ball bearing can be widely applied to electronic products such as mobile phones and wearable electronic products, providing reliable technical support for the miniaturization trend of electronic products and achieving good results in the balance between performance and cost.

[0039] It can be understood that the present invention is described through some embodiments. As is known to those skilled in the art, without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A ball bearing, comprising an inner ring and an outer ring (1) arranged coaxially, and a plurality of rolling elements (4) annularly arranged between the inner ring and the outer ring (1). The inner ring is composed of an inner ring core (2) and an inner ring cover (3) which are butted end to end and coaxially inserted and connected into one body. An outer groove is provided on the outer circumferential surface of the inner ring after the inner ring core (2) and the inner ring cover (3) are butted. An inner groove (11) is provided on the inner circumferential surface of the outer ring (1). The rolling elements (4) are placed between the inner groove (11) and the outer groove. A riveting edge (21) for axially fixing the inner ring core (2) and the inner ring cover (3) is provided on the inner ring core (2), characterized in that, It further includes a reinforcement structure for fixing the inner ring to enhance the connection strength between the inner ring core (2) and the inner ring cover (3); An avoidance groove (31) is provided on the inner ring cover (3), and the riveting edge (21) is pressed into the avoidance groove (31) by an external force so that the inner ring core (2) and the inner ring cover (3) are riveted and fixed; The reinforcement structure is an end face cover (5) coaxially arranged with the inner ring. After the inner ring cover (3) and the inner ring core (2) are riveted and fixed, the top surface of the riveting edge (21) is lower than the upper surface of the outer ring (1), and the end face cover (5) is covered in the avoidance groove (31) above the riveting edge (21), and the inner wall of the end face cover (5) is flush with the inner wall of the inner ring core (2); The inner ring cover (3) and the end face cover (5) can clamp the riveting edge of the inner ring core (2).

2. The ball bearing according to claim 1, characterized in that, The end face cover (5) is an annular cover.

3. The ball bearing according to claim 2, characterized in that, The end face cover (5) is fixed to the inner ring cover (3) by interference fit, laser welding or screw tightening.

4. The ball bearing according to claim 1, wherein, Both the outer groove and the inner groove (11) are groove bodies with a circular arc-shaped, V-shaped or trapezoidal cross-section.

5. The ball bearing according to claim 4, characterized in that, The rolling element (4) is a ball, and the ball rolls in the groove formed by the inner groove (11) and the outer groove.

6. The ball bearing according to claim 5, characterized in that, The maximum number of the balls is determined by the size of the groove and the size of the balls, and the minimum number of the balls is greater than or equal to 1 / 2 of the maximum number of the balls.

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