High-speed ball bearing retainer for driving motor

Abstract

The utility model relates to the technical field of new energy driving motor bearings, and discloses a high-speed ball bearing retainer for a driving motor, which comprises an annular retainer, a plurality of C-shaped ball racks with axial openings are arranged on the retainer along the circumferential direction, and an inner hole of each C-shaped ball rack is a ball pocket hole. The inner wall of each ball pocket comprises a left spherical surface and a right spherical surface which are different in diameter, the middle of each of the left spherical surface and the right spherical surface is provided with a plane, the planes are in contact with the steel balls, and oil storage gaps are formed between the inner walls of the ball pockets on the outer sides of the planes and the steel balls. The high-speed ball bearing retainer can solve the problems that pockets of a high-speed ball bearing retainer in the prior art are frequently collided with steel balls, so that the pockets are greatly deformed, the pockets are separated from the steel balls, the guiding function is lost, the abrasion of the pockets is aggravated, and the bearing fails in advance.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy drive motor bearings, in particular to a high-speed ball bearing retainer for a drive motor. Background Art

[0002] With the continuous development of new energy vehicle technology, the drive motor is required to be miniaturized, lightweight and highly efficient. The characteristics of long life, high speed, low friction and low vibration of high-speed ball bearings for drive motors need to be solved urgently. The cage, as a key part of high-speed ball bearings, plays the role of separating rolling elements and guiding the movement of rolling elements during the operation of the bearing. As the operating speed of the bearing increases, the high-speed centrifugal force will cause the expansion of the cage pocket and the lock, reducing the restraint force on the steel ball. At the same time, the cage pocket frequently collides with the steel ball, resulting in a large deformation of the pocket, which separates it from the steel ball and loses its guiding function, aggravating the wear of the pocket and causing the bearing to fail prematurely. Utility Model Content

[0003] The utility model aims to provide a high-speed ball bearing retainer for a drive motor, so as to solve the problem that the pockets of the high-speed ball bearing retainer in the prior art frequently collide with the steel balls, causing the pockets to be greatly deformed, separating them from the steel balls, losing their guiding function, aggravating the wear of the pockets, and causing premature failure of the bearings.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-speed ball bearing retainer for a driving motor, comprising a circular retainer, on which a plurality of axially open C-type ball racks are arranged along the circumferential direction, the inner hole of each C-type ball rack is a ball pocket hole, the inner wall of each ball pocket hole comprises a left spherical surface with a diameter of 1.01-1.1 times the diameter of a steel ball and a right spherical surface with a diameter of 1.1-1.2 times the diameter of the steel ball, a plane is arranged in the middle of the left spherical surface and the right spherical surface, the plane contacts the steel ball, and an oil storage gap is formed between the inner wall of the ball pocket hole outside the plane and the steel ball.

[0005] Preferably, as an improvement, the diameter of the left spherical surface is 1.04 times the diameter of the steel ball.

[0006] Preferably, as an improvement, the diameter of the right spherical surface is 1.12 times the diameter of the steel ball.

[0007] Preferably, as an improvement, a connecting arm is provided between adjacent C-shaped ball racks, and the connecting arm is located on the back side of the plane.

[0008] Preferably, as an improvement, a hollow space is provided between two adjacent C-shaped ball racks below the connecting arm.

[0009] Preferably, as an improvement, there is an arc transition between the connecting arm and the C-shaped ball bracket.

[0010] Preferably, as an improvement, the opening end face of the C-shaped ball rack is a plane, and an inclined surface closing toward the inner side of the C-shaped ball rack is provided between the opening end face of the C-shaped ball rack and the inner wall of the ball pocket hole.

[0011] The principle and advantages of this scheme are: in actual application, the cage of this scheme guides the movement of the bearing steel ball in the high-speed ball bearing of the driving motor, the C-type ball rack wraps the steel ball, the plane of the inner wall of the ball pocket hole contacts the steel ball to control its radial movement, and the ball surfaces on both sides of the plane control the axial movement of the steel ball, reducing the friction between the steel ball and the ball pocket hole, ensuring that the steel ball rotates flexibly in the ball pocket hole while facilitating the cage to be pressed into the bearing, and the outer side of the contact point between the plane and the steel ball forms an oil storage space to store lubricating oil to ensure smooth movement of the steel ball. The adjacent C-type ball racks form a ring-shaped whole through the connecting arm, and the connecting arm provides support on the back side of the plane to ensure that the deformation of the ball pocket hole during frequent collisions with the steel ball is controllable, ensuring the guiding effect on the steel ball, which is conducive to increasing the bearing speed, slowing down the wear of the ball pocket hole, and ensuring the service life of the high-speed ball bearing. The hollowing out below the C-type ball rack and the connecting arm reduces the weight of the entire cage, which is conducive to reducing the impact of the cage's rotational inertia and centrifugal force on the bearing, and can also reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural diagram of an embodiment of the utility model.

[0013] Figure 2 It is an axial cross-sectional view of an embodiment of the utility model.

[0014] Figure 3 It is a schematic structural diagram of a C-type ball rack in an embodiment of the utility model. DETAILED DESCRIPTION

[0015] The following is further described in detail through specific implementation methods:

[0016] The reference numerals in the drawings of the specification include: retaining frame 1, C-type ball cage 2, ball pocket hole 3, left spherical surface 4, right spherical surface 5, supporting plane 6, connecting arm 7, inclined surface 8, and steel ball 9.

[0017] The embodiment is basically as shown in the attached Figure 1 , Figure 2 As shown: a high-speed ball bearing cage for a drive motor, comprising a ring-shaped cage 1, on which nine axially opened C-shaped ball cages 2 are integrally formed along the circumferential direction, combined with Figure 3As shown, the inner hole of each C-type ball rack 2 is a ball pocket hole 3, and the inner wall of each ball pocket hole 3 includes a left spherical surface 4 with a diameter 1.04 times the diameter of the steel ball 9 and a right spherical surface 5 with a diameter 1.12 times the diameter of the steel ball 9. A supporting plane 6 is provided in the middle of the left spherical surface 4 and the right spherical surface 5. The supporting plane 6 is in contact with the steel ball 9, and an oil storage gap is formed between the inner wall of the ball pocket hole 3 outside the supporting plane 6 and the steel ball 9.

[0018] A connecting arm 7 is provided between adjacent C-shaped ball racks 2, and a circular arc transition is formed between the connecting arm 7 and the C-shaped ball rack 2. The connecting arm 7 is located on the back side of the plane, and a hollow space is formed between two adjacent C-shaped ball racks 2 below the connecting arm 7. The open end surface of the C-shaped ball rack 2 is a plane, and an inclined surface 8 closing toward the inner side of the C-shaped ball rack 2 is provided between the open end surface of the C-shaped ball rack 2 and the inner wall of the ball pocket hole 3.

[0019] The specific implementation process is as follows: when in use, the steel ball 9 of the high-speed ball bearing is placed from the opening into the ball pocket hole 3 of the C-type ball rack 2, and the surrounding is filled with lubricating grease. The support plane 6 contacts the steel ball 9, and the radial movement of the steel ball 9 is controlled under the support of the support arm. The left spherical surface 4 and the right spherical surface 5 of two different diameters control the axial movement of the steel ball 9. After the support plane 6 limits the steel ball 9, an oil storage gap is formed between the steel ball 9 and the left spherical surface 4 and the right spherical surface 5. The transition part between the support plane 6 and the left spherical surface 4 and the right spherical surface 5 also forms an oil storage space to ensure the smooth movement of the steel ball 9. Under the premise of ensuring the rigidity and strength of the retaining frame 1, the C-type ball rack 2 and the hollow structure make the retaining frame 1 more lightweight, and the support arm is conducive to reducing the deformation of the retaining frame 1 during operation, thereby increasing the speed of the high-speed ball bearing.

[0020] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A high-speed ball bearing cage for a drive motor, characterized in that: It includes a circular ring-shaped retaining frame, on which a plurality of axially opened C-type ball racks are arranged along the circumferential direction, the inner hole of each C-type ball rack is a ball pocket hole, the inner wall of each ball pocket hole includes a left spherical surface with a diameter 1.01-1.1 times the diameter of the steel ball and a right spherical surface with a diameter 1.1-1.2 times the diameter of the steel ball, a plane is arranged in the middle of the left spherical surface and the right spherical surface, the plane contacts the steel ball, and an oil storage gap is formed between the inner wall of the ball pocket hole outside the plane and the steel ball.

2. The high-speed ball bearing retainer for a drive motor according to claim 1, characterized in that: The diameter of the left spherical surface is 1.04 times the diameter of the steel ball.

3. The high-speed ball bearing retainer for a drive motor according to claim 2, characterized in that: The diameter of the right spherical surface is 1.12 times the diameter of the steel ball.

4. The high-speed ball bearing retainer for a drive motor according to claim 3, characterized in that: A connecting arm is provided between adjacent C-shaped ball racks, and the connecting arm is located on the back side of the plane.

5. The high-speed ball bearing retainer for a drive motor according to claim 4, characterized in that: A hollow space is provided between two adjacent C-shaped ball racks below the connecting arm.

6. The high-speed ball bearing retainer for a drive motor according to claim 5, characterized in that: There is an arc transition between the connecting arm and the C-shaped ball bracket.

7. The high-speed ball bearing retainer for a drive motor according to claim 6, characterized in that: The opening end face of the C-shaped ball rack is a plane, and an inclined surface closing toward the inner side of the C-shaped ball rack is arranged between the opening end face of the C-shaped ball rack and the inner wall of the ball pocket hole.

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