Angular contact ball bearing with lubrication chute

Abstract

The utility model belongs to angular contact ball bearing technical field, concretely relates to a kind of angular contact ball bearing with lubricating chute, including inner ring, outer ring, retainer and several ball rollers, inner ring outer surface is provided with inner ring raceway, the inner surface of outer ring is provided with outer ring raceway, annular retainer is assembled between inner ring and outer ring, several ball rollers are assembled between inner ring raceway and outer ring raceway by the pocket hole of retainer, the outer surface of inner ring is provided with the lubricating chute that is linked with the edge of inner ring raceway, lubricating chute is provided with a circle along the circumferential direction, the diameter of the junction of lubricating chute and inner ring raceway is less than the diameter of the junction of lubricating chute and inner ring outer diameter surface;Lubricating chute is set to one end or both ends of inner ring raceway.Optimization to angular contact ball bearing inner ring, lubricating chute is added to the side where oil inlet gap is smaller, increase the distance between ball roller and inner ring raceway, so that lubricating oil can smoothly enter between ball roller and inner ring raceway, ensure the full lubrication of bearing.

Description

Technical Field

[0001] This utility model belongs to the technical field of angular contact ball bearings, specifically relating to an angular contact ball bearing with a lubrication groove. Background Technology

[0002] Angular contact ball bearings are commonly used in machine tool spindles due to their ability to withstand both radial and axial forces and operate at high speeds. They are typically oil-lubricated. However, angular contact ball bearings used in machine tools frequently seize due to overheating. The internal lubrication condition of the bearing significantly impacts its lifespan and heat generation. Because angular contact ball bearings are angled, and the original design of the inner ring was rounded, the distance between the inner ring raceway and the balls is narrow, making it difficult for lubricating oil to enter. This poor lubrication leads to overheating and bearing seizure. Summary of the Invention

[0003] In view of the defects of the prior art, the purpose of this utility model is to provide an angular contact ball bearing with a lubrication groove, wherein the lubrication groove is designed in the inner ring of the bearing to achieve full lubrication.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an angular contact ball bearing with a lubrication groove, comprising an inner ring, an outer ring, a cage, and a plurality of ball rollers. An inner ring groove is provided on the outer surface of the inner ring, and an outer ring groove is provided on the inner surface of the outer ring. An annular cage is assembled between the inner and outer rings. The plurality of ball rollers are assembled between the inner and outer ring grooves through pockets in the cage. A lubrication groove is provided on the outer surface of the inner ring, connecting with the edge of the inner ring groove. The lubrication groove is arranged in a circle along the circumferential direction. The diameter at the junction of the lubrication groove and the inner ring groove is smaller than the diameter at the junction of the lubrication groove and the outer diameter surface of the inner ring. The lubrication groove is located at one or both ends of the inner ring groove.

[0005] Furthermore, one end having the lubrication groove is connected to the inner ring channel and the outer diameter surface of the inner ring through the lubrication groove.

[0006] Furthermore, the inner ring groove makes single-point contact with the ball roller, and the lubrication groove is provided on the side of the inner ring groove that contacts the ball roller.

[0007] Furthermore, a slope is provided at one end of the inner surface of the outer ring, and the slope is transitionally connected to the outer ring channel.

[0008] Furthermore, the axial width M of the lubrication groove on the outer surface of the inner ring is 0.2N, where N is the axial width from the edge of the inner ring groove to the nearest end face when there is no lubrication groove; the inclination angle α1 of the lubrication groove is 180°-α, where α is the bearing contact angle; the lubrication groove intersects the inner ring groove, and the radial height L of the lubrication groove is determined by measurement.

[0009] Furthermore, the radial height L of the lubrication groove is ≤ 1 / 2{D2-[Dwp-(Dwp-di)cos(α+10°)]}, where D2 is the outer diameter of the inner ring, Dwp is the center diameter of the ball roller rotation, di is the bottom diameter of the inner ring groove, and α is the bearing contact angle.

[0010] The beneficial effects of this utility model are as follows: the inner ring of the diagonal contact ball bearing is optimized by adding a lubrication groove on the side with a smaller oil inlet clearance, which increases the distance between the ball rollers and the inner ring groove, allowing the lubricating oil to smoothly enter between the ball rollers and the inner ring groove, thus ensuring sufficient lubrication of the bearing. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of an angular contact ball bearing with a lubrication groove. Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 Design drawing for the dimensions of the lubrication groove; In the diagram: 1-Outer ring; 2-Ball roller; 3-Cage; 4-Inner ring; 5-Outer diameter surface of inner ring; 6-Inner ring groove; 7-Inner side of inner ring sloping groove; 8-Lubrication sloping groove; 9-Outer ring ramp; c - Distance between the raceway and the ball rollers; b - Distance between the lubrication groove and the ball rollers; α - Bearing contact angle; α1 - Inclination angle of the lubrication groove; M - Axial width of the lubrication groove on the outer surface of the inner ring; N - Axial width from the edge of the inner ring groove to the nearest end face when there is no lubrication groove; L - Radial height of the lubrication groove; D2 - Outer diameter of the inner ring; Dwp - Center diameter of the ball roller rotation; di - Bottom diameter of the inner ring groove. Detailed Implementation

[0012] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0013] See appendix Figure 1-3An angular contact ball bearing with a lubrication groove includes an inner ring 4, an outer ring 1, a cage 3, and a plurality of ball rollers 2. The outer surface of the inner ring 4 is provided with an inner ring groove, and the inner surface of the outer ring 1 is provided with an outer ring groove. An annular cage 3 is assembled between the inner ring 4 and the outer ring 1. The plurality of ball rollers 2 are assembled between the inner ring groove and the outer ring groove through pockets in the cage 3. On the side with a smaller oil inlet clearance, the outer surface of the inner ring 4 is provided with a lubrication groove 8 that connects with the edge of the inner ring groove. The inner side surface 7 of the lubrication groove connects the inner ring groove and the outer diameter surface of the inner ring. The lubrication groove 8 is arranged in a circle along the circumference. The diameter at the junction of the lubrication groove and the inner ring groove is smaller than the diameter at the junction of the lubrication groove and the outer diameter surface of the inner ring.

[0014] Based on the above technical solution, the inner ring groove makes single-point contact with the ball roller. The oil inlet gap on the side where the inner ring groove contacts the ball roller is smaller than the oil inlet gap on the side where the inner ring groove does not contact the ball roller. Therefore, the lubrication groove is set on the side where the inner ring groove contacts the ball roller to increase the distance between the ball roller and the inner ring groove, assisting the side with smaller oil inlet gap to enter oil and ensure sufficient lubrication.

[0015] To facilitate bearing assembly, a ramp 9 is provided at one end of the inner surface of the outer ring, and the ramp 9 is transitionally connected to the outer ring groove.

[0016] Based on the above technical solution, when angular contact ball bearings are designed for universal assembly, an additional marking process is often required on the inner ring end face to distinguish between the reference surface and non-reference surfaces. Designing an inner ring lubrication groove allows for sufficient bearing lubrication while also serving as a marker for the non-reference surface.

[0017] To ensure lubrication performance without affecting the rolling effect of the ball rollers, the specific dimensions of the lubrication groove are designed as follows: The axial width M of the lubrication groove on the outer surface of the inner ring is 0.2N, where N is the axial width from the edge of the inner ring channel to the nearest end face when there is no lubrication groove. The inclination angle of the lubrication groove is α1 = 180° - α, where α is the bearing contact angle; The lubrication groove intersects the inner ring channel. By determining M and α1, the radial height L of the lubrication groove can be determined. The radial height L of the lubrication groove needs to take into account the preload required when the machine tool bearing is used, and the actual contact point rises. The limit value of L should be considered based on the contact point of α+10°. The radial height L of the lubrication groove ≤ 1 / 2{D2-[Dwp-(Dwp-di)cos(α+10°)]} is considered to be a reasonable design of the lubrication groove, where Dwp is the center diameter of the ball roller, D2 is the outer diameter of the inner ring, and di is the bottom diameter of the inner ring groove.

[0018] The oil inlet size has been optimized from c to b, resulting in more thorough lubrication.

[0019] Take bearing 7018AC as an example.

[0020] External dimensions: 140mm × 90mm × 24mm, ball roller diameter 15.081mm, Dwp = 115mm, inner ring outer diameter D2: 105.8mm, inner ring groove bottom diameter di = 99.8mm.

[0021] Without the lubrication groove, the axial width N from the edge of the inner ring groove to the nearest end face is 6.6 mm.

[0022] The axial width of the lubrication groove is M = 0.2N = 1.32mm ≈ 1.3mm, and the inclination angle of the lubrication groove is α1 = 180° - 25° = 155°. Draw the lubrication groove according to M and α1. The lubrication groove intersects the inner ring channel. The vertical length L of the lubrication groove is measured to be 1.247mm.

[0023] L≤1 / 2{D2-[Dwp-(Dwp-di)cos(α+10°)]}=1 / 2{105.8-[115-(115-99.8)cos(25°+10°)]}=1.625mm.

[0024] 1.247mm < 1.625mm, the lubrication groove is reasonably designed, and the dimensions of the lubrication groove are M=1.3mm, α1=155°, and L=1.247mm.

[0025] When an angular contact ball bearing is subjected to axial load, the contact angle will shift 0~3° towards the center of rotation. The calculation is performed considering the case of a 10° contact angle shift. This ensures that the lowest point of the lubrication groove is much higher than the maximum amount of contact angle shift, meaning that the lubrication groove does not affect the operation of the angular contact ball bearing.

[0026] It should be noted that the parts of this utility model not described in detail are existing technologies.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] The above-listed embodiments are merely preferred embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. An angular contact ball bearing with a lubrication groove, comprising an inner ring, an outer ring, a cage, and a plurality of ball rollers, wherein an inner ring groove is provided on the outer surface of the inner ring, an outer ring groove is provided on the inner surface of the outer ring, an annular cage is fitted between the inner and outer rings, and the plurality of ball rollers are fitted between the inner and outer ring grooves through pockets in the cage, characterized in that: The outer surface of the inner ring is provided with a lubrication groove that connects with the edge of the inner ring channel. The lubrication groove is arranged in a circle along the circumference. The diameter at the junction of the lubrication groove and the inner ring channel is smaller than the diameter at the junction of the lubrication groove and the outer diameter surface of the inner ring. The lubrication groove is provided at one or both ends of the inner ring channel.

2. The angular contact ball bearing with a lubrication groove according to claim 1, characterized in that: One end having the lubrication groove is connected to the inner ring channel and the outer diameter surface of the inner ring through the lubrication groove.

3. The angular contact ball bearing with a lubrication groove according to claim 1, characterized in that: The inner ring groove makes single-point contact with the ball roller, and the lubrication groove is located on the side of the inner ring groove that contacts the ball roller.

4. An angular contact ball bearing with a lubrication groove according to claim 1, characterized in that: One end of the inner surface of the outer ring is provided with a slope, which is connected to the outer ring channel.

5. An angular contact ball bearing with a lubrication groove according to any one of claims 1-4, characterized in that: The axial width M of the lubrication groove on the outer surface of the inner ring is 0.2N, where N is the axial width from the edge of the inner ring groove to the nearest end face when there is no lubrication groove; the inclination angle α1 of the lubrication groove is 180°-α, where α is the bearing contact angle; the lubrication groove intersects the inner ring groove.

6. An angular contact ball bearing with a lubrication groove according to claim 5, characterized in that: The radial height L of the lubrication groove is ≤ 1 / 2{D2-[Dwp-(Dwp-di)cos(α+10°)]}, where D2 is the outer diameter of the inner ring, Dwp is the center diameter of the ball roller rotation, α is the bearing contact angle, and di is the bottom diameter of the inner ring groove.

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