Deep groove ball bearing for electric compressor of new energy automobile

Abstract

A deep groove ball bearing for an electric compressor of a new energy automobile comprises an outer ring, an inner ring and a plurality of balls, the balls are arranged in a raceway between the outer ring and the inner ring and fixed by a retainer, the retainer is composed of a first frame body and a second frame body, the first frame body and the second frame body are provided with ball pocket parts and riveting parts, the first frame body and the second frame body are fixed through rivets on the riveting parts, and the first frame body and the second frame body are connected through a connecting rod. The ball pocket part is matched with and limits the balls, the riveting part of the first frame body is provided with a positioning block, the corresponding position of the second frame body is provided with a positioning groove, and the positioning block deforms and is clamped into the positioning groove during riveting. Through cooperation of the positioning blocks and the positioning grooves, double fixation is achieved in the riveting process, the reliability of the bearing under the high-rotating-speed and high-load working conditions is improved, meanwhile, the assembling technology is simplified, the loosening risk is reduced, the service life is prolonged, and remarkable practicability and economic benefits are achieved.

Description

Technical Field

[0001] The invention relates to a deep groove ball bearing, in particular to a deep groove ball bearing for an electric compressor of a new energy vehicle. Background Art

[0002] In new energy vehicles, electric compressors are one of the key components, and their core supporting components, deep groove ball bearings, are widely used in high-speed operating environments. Deep groove ball bearings are mainly responsible for supporting the rotor of the electric compressor and ensuring its smooth operation under high speed and high load conditions. Its working scenarios usually include high temperature, high speed and complex dynamic load environments. During use, the bearings need to withstand axial and radial forces from inside the electric compressor while ensuring low noise, high reliability and long life. In order to meet these requirements, deep groove ball bearings usually use a rivet-connected cage structure to separate the rolling elements and guide their motion trajectory to reduce friction and wear.

[0003] However, deep groove ball bearings in the prior art have significant defects. Especially under harsh working conditions such as rapid speed changes, lean lubrication or impact loads, the connection structure between the cage and the rivet is prone to fracture due to stress concentration. This failure mode not only causes the bearing to run unsteadily, but may also cause failure of the entire electric compressor, thereby affecting the performance and reliability of new energy vehicles. In addition, the fragments produced by the fracture may further damage the internal structure of the bearing, causing more serious secondary damage, limiting the application of the bearing in high-performance scenarios. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a deep groove ball bearing for an electric compressor of a new energy vehicle, which has a more stable structure after the retainer is riveted.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a deep groove ball bearing for an electric compressor of a new energy vehicle, comprising a matching outer ring and an inner ring, a raceway for uniformly placing a plurality of balls is formed between the outer ring and the inner ring, and the plurality of balls are all sleeved in the same retaining frame, and the retaining frame comprises a first frame body and a second frame body that cooperate with each other, and the first frame body and the second frame body both comprise a ball pocket portion for placing the balls and a riveted portion for riveting, and the first frame body and the second frame body are fixed by riveting rivets on the riveted portion, and after the first frame and the second frame are fixed, the two ball pocket portions cooperate to place and limit the rolling body, and a positioning block protruding from the end face is provided on the riveted portion of the first frame body corresponding to the end face of the second frame body, and a positioning groove for placing the positioning block is provided on the riveted portion of the second frame body corresponding to the end face of the first frame body, and the positioning block is deformed in the positioning groove after riveting and is stuck in the positioning groove.

[0006] The beneficial effects of the present invention are as follows: by providing a positioning block at the riveting portion of the first frame and providing a positioning groove at the corresponding position of the second frame, the positioning block is deformed and stuck in the positioning groove during the riveting process. This design not only enhances the overall connection strength of the retaining frame, but also avoids the singleness of relying solely on rivet fixation. As a preferred method, the connection effect can be optimized by controlling the height and deformation of the positioning block. For example, the height of the positioning block is slightly larger than the depth of the positioning groove to ensure that sufficient compressive stress is generated during riveting to complete the deformation embedding. In addition, due to the clamping effect between the positioning block and the positioning groove, even if the rivet is loose or fails, the retaining frame can still maintain a certain structural stability, thereby extending the service life of the bearing.

[0007] Furthermore, an arc surface is provided between the side end surface and the top end surface of the positioning block, and guide grooves are provided around the bottom of the positioning groove corresponding to the arc surface of the positioning block.

[0008] The design of setting an arc surface between the side end face and the top end face of the positioning block, and setting a guide groove at the bottom of the positioning groove, can effectively improve the assembly efficiency and uniformity during deformation. The arc surface reduces the friction resistance when the positioning block enters the positioning groove. At the same time, the guide groove can guide the positioning block to quickly align and enter the positioning groove, reducing the difficulty of assembly. As a preferred method, the width of the guide groove can be slightly larger than the maximum lateral dimension of the positioning block to facilitate initial positioning. This design can also promote uniform deformation of the positioning block along the guide groove direction during the riveting process, avoid material cracking due to local stress concentration, and further improve the reliability of the retaining frame.

[0009] Furthermore, the positioning groove is rectangular, and embedding grooves are arranged at the four corners of the guide groove. The deformation amount of the positioning block during the riveting process can extend into the embedding groove.

[0010] The positioning groove adopts a rectangular design, and embedded grooves are set at its four corners, so that the positioning block can absorb excess deformation through the embedded groove during the riveting process, thereby enhancing the firmness of the connection. The rectangular positioning groove has a high shape accuracy, which is convenient for cooperation with the positioning block, and the embedded groove provides additional space for the positioning block to deform and expand, avoiding damage to other components due to excessive deformation pressure. As a preferred method, the depth of the embedded groove can be designed to be about half of the depth of the positioning groove to ensure that the positioning block can be embedded after deformation without excessively protruding to affect the overall structure. In addition, the presence of the embedded groove can also disperse the internal stress generated during the riveting process and reduce the risk of fatigue damage.

[0011] Furthermore, the embedding groove includes an entry section and a clamping section, and the entry section and the clamping section are arranged to be small in the front and large in the back, and the two are connected to form a water drop shape.

[0012] The embedding groove is divided into an entry section and a clamping section, and is designed in a teardrop shape, which can significantly improve the fixing effect of the positioning block after deformation. The smaller opening of the entry section facilitates the initial embedding of the positioning block, while the larger space of the clamping section provides a stable accommodation area for the positioning block after deformation to prevent it from rebounding and detaching. This design not only improves the efficiency of deformation fixation, but also enhances the impact resistance of the retaining frame. As a preferred method, the width of the entry section can be designed to be 60%-70% of the width of the clamping section to ensure that the positioning block can enter smoothly while having sufficient fixing force. In addition, the teardrop-shaped embedding groove can also reduce the restriction on the flow of positioning block material during the riveting process and reduce the probability of micro cracks.

[0013] Furthermore, a transition arc is provided between the ball pocket portion and the riveted portion on each side, and the ball pocket portion and the riveted portion are connected by a transition arc, and the radius of the transition arc is 0.6-0.8 mm.

[0014] The ball pocket and the riveted part are connected by a transition arc, which can effectively alleviate the stress concentration phenomenon at the junction of the two and improve the overall strength and durability of the cage. The reasonable design of the transition arc can avoid the problem of material fatigue fracture caused by sharp edges and corners, and optimize the force transmission path. As a preferred method, the radius of the transition arc can be selected as 0.7mm as the standard value, which not only meets the stress dispersion requirements but also takes into account the feasibility of the manufacturing process. In addition, the transition arc can also improve the dynamic performance of the cage under high-speed operation conditions, reduce vibration and noise, thereby improving the running stability and service life of the bearing.

[0015] Furthermore, the inner ring curvature coefficient is 0.505, the outer ring curvature coefficient is 0.520, the inner and outer ring rib coefficients are 0.2-0.3, and the cage ball pocket radius coefficient is 0.510.

[0016] The curvature setting minimizes the contact stress between the balls and the inner and outer rings, optimizes the bearing load performance, and can maintain smooth rotation of the balls between the inner and outer rings without causing jamming.

[0017] Furthermore, the inner ring, outer ring and ball are all subjected to surface heat treatment, the inner ring and outer ring are subjected to CN co-penetration treatment and the surface has a penetration layer depth of more than 0.30 mm, the cage material is a metal cage and the carbon content of the cage material is more than 0.1%.

[0018] The cage and rivets are subjected to special surface heat treatment to improve the assembly stress of the cage after riveting from the perspective of material and heat treatment, improve its own strength and thus improve the riveting quality of the cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A partial cross-sectional view of an embodiment of the present invention; Figure 2 It is a partial cross-sectional view of the positioning groove of an embodiment of the present invention; Figure 3 It is a partial enlarged view of the connection between the riveting part and the ball pocket part of the embodiment of the present invention; Figure 4 This is a graph of contact stress ratio-inner ring curvature coefficient according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] A deep groove ball bearing for an electric compressor of a new energy vehicle according to an embodiment of the present invention is Figure 1 - 4: It includes an outer ring 1 and an inner ring 2, and a raceway 3 is formed between the two for placing a plurality of balls 5. These balls 5 are uniformly placed in a cage 4, and the cage 4 is composed of a first frame body 41 and a second frame body 42. The first frame body 41 and the second frame body 42 are fixed together by riveting, specifically by riveting rivets on the riveting part 44.

[0021] In order to enhance the connection strength of the retainer 4, a positioning structure is added in addition to the riveting. The riveting part 44 of the first frame 41 is provided with a protruding positioning block 411, and the riveting part 44 of the second frame 42 is provided with a corresponding positioning groove 421. The positioning block 411 will deform and snap into the positioning groove 421 during the riveting process, thereby further strengthening the connection between the two. The design of the positioning block 411 adds a circular arc surface 412 between its side end surface and the top end surface to reduce stress concentration and facilitate guiding and positioning. At the same time, guide grooves are also provided around the bottom of the positioning groove 421, and these guide grooves match the circular arc surface 412 of the positioning block 411. The positioning groove 421 is rectangular as a whole, and embedded grooves 422 are also designed at the four corners of the guide groove, so that the positioning block 411 can be deformed during riveting and extend into the embedded groove 422. The embedded groove 422 includes an entry section 4221 and a clamping section 4222, both of which are designed in a water drop shape with a small front and a large back. This design makes it easier for the positioning block 411 to enter the embedding groove 422 when deformed, and can better fix the first frame 41 and the second frame 42 after the deformation is completed.

[0022] In addition, the first frame 41 and the second frame 42 of the retainer 4 both include a ball pocket 43 and a riveted portion 44, and the two parts are connected by a transition arc 45. The radius of the transition arc 45 is 0.6-0.8mm, and this design effectively avoids the stress concentration problem caused by too small an arc. The ball pocket 43 is used to place and limit the ball 5 to ensure that the ball 5 can roll smoothly in the raceway 3, while the riveted portion 44 is responsible for fixing the first frame 41 and the second frame 42.

[0023] In this embodiment, since the outer ring curvature coefficient and the cage ball pocket radius coefficient are consistent with the inner ring contact stress trend, only the inner ring contact stress curve is provided. According to the relationship diagram between the inner ring curvature coefficient and the contact stress ratio, it can be seen that when the curvature coefficient is 0.505, the contact stress is the smallest and the bearing load performance is the best. However, if the curvature coefficient is smaller, the bearing is prone to get stuck and rotate inflexibly. Therefore, 0.505 is a more suitable minimum curvature coefficient. The outer ring curvature coefficient and the cage ball pocket radius coefficient are the same as the inner ring contact stress trend, but meet the equal contact stress design. When the inner ring curvature coefficient is 0.505, the outer ring curvature coefficient is 0.520, and the cage ball pocket radius coefficient is 0.510, the inner and outer ring loads can reach equal contact stress. The outer ring curvature coefficient is larger than the inner ring, which plays a certain self-aligning role and is conducive to the flexible rotation of the bearing.

[0024] In addition, the inner ring 2, the outer ring 1 and the ball 5 are all subjected to surface heat treatment, the inner ring 2 and the outer ring 1 are subjected to CN co-penetration treatment and the surface has a penetration layer depth of more than 0.30 mm, the retaining frame 4 material is a metal retaining frame and the carbon content of the retaining frame 4 material is more than 0.1% to improve the material properties of the above-mentioned components.

[0025] The working principle of this embodiment is as follows: when the bearing is running, the ball 5 between the outer ring 1 and the inner ring 2 rolls along the raceway 3, and the movement of the ball 5 is limited and guided by the retainer 4. The first frame 41 and the second frame 42 of the retainer 4 form a stable structure through riveting and the cooperation of the positioning block 411 and the positioning groove 421. During the riveting process, the positioning block 411 is deformed and stuck in the positioning groove 421. In particular, the design of the embedded groove 422 enables the deformed positioning block 411 to be more firmly fixed in the positioning groove 421, thereby enhancing the overall strength of the retainer 4. At the same time, the design of the transition arc 45 reduces the possibility of stress concentration and improves the durability of the retainer 4.

[0026] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A deep groove ball bearing for an electric compressor of a new energy vehicle, comprising a matching outer ring and an inner ring, a raceway for uniformly placing a plurality of balls is formed between the outer ring and the inner ring, and the plurality of balls are sleeved in the same retaining frame, the retaining frame comprises a first frame body and a second frame body that match each other, the first frame body and the second frame body both comprise a ball pocket for placing the balls and a riveting portion for riveting, the first frame body and the second frame body are fixed by riveting rivets on the riveting portion, and after the first frame body and the second frame body are fixed, the two ball pockets cooperate to place and limit the rolling body, characterized in that: A positioning block protruding from the end face is arranged on the riveted part of the first frame and the end face corresponding to the second frame, and a positioning groove for placing the positioning block is arranged on the end face of the riveted part of the second frame and the end face corresponding to the first frame, and the positioning block is deformed and stuck in the positioning groove after riveting.

2. The deep groove ball bearing for the electric compressor of new energy vehicles according to claim 1 is characterized in that: An arc surface is arranged between the side end surface and the top end surface of the positioning block, and a guide groove is arranged around the bottom of the positioning groove corresponding to the arc surface of the positioning block.

3. The deep groove ball bearing for the electric compressor of new energy vehicles according to claim 2 is characterized in that: The positioning groove is rectangular, and embedding grooves are arranged at the four corners of the guide groove. The deformation amount of the positioning block during the riveting process can extend into the embedding groove.

4. The deep groove ball bearing for the electric compressor of new energy vehicles according to claim 3 is characterized in that: The embedding groove comprises an entry section and a clamping section, wherein the entry section and the clamping section are arranged to be small in the front and large in the back and are in a water drop shape when connected.

5. The deep groove ball bearing for the electric compressor of new energy vehicles according to claim 1, characterized in that: A transition arc is arranged between the ball pocket portion and the riveted portion on each side, and the ball pocket portion and the riveted portion are connected by a transition arc, and the radius of the transition arc is 0.6-0.8 mm.

6. The deep groove ball bearing for the electric compressor of new energy vehicles according to claim 1, characterized in that: The inner ring curvature coefficient is 0.505, the outer ring curvature coefficient is 0.520, the inner and outer ring rib coefficients are 0.2-0.3, and the cage ball pocket radius coefficient is 0.

510.

7. The deep groove ball bearing for the electric compressor of new energy vehicles according to claim 1, characterized in that: The inner ring, outer ring and ball are all subjected to surface heat treatment. The inner ring and outer ring are subjected to CN co-penetration treatment and have a penetration layer depth of more than 0.30 mm. The cage material is a metal cage and the carbon content of the cage material is more than 0.1%.

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