High-speed deep groove ball bearing

Abstract

The utility model discloses a high-speed deep groove ball bearing and belongs to the technical field of bearings. The device comprises a bearing inner ring; a bearing outer ring; the retainer is positioned between the bearing inner ring and the bearing outer ring; the retainer comprises an annular ring frame and a plurality of round ball frames mounted on the annular ring frame, pockets with major arc-shaped vertical sections are formed in the round ball frames, and round chamfers are arranged at the intersections of the bottoms of the round ball frames and the pockets; the balls are mounted in the pockets, and the pockets are used for semi-coating the balls; the vertical section of each pocket is in the major arc shape larger than 180 degrees, so that the balls are semi-wrapped by the pockets, when the high-speed ball bearing operates, the balls only rub against the convex peaks, the contact area between the pockets and the balls is reduced, and abrasion between the pockets and the balls is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, and particularly relates to a high-speed deep groove ball bearing. Background Art

[0002] The deep groove ball bearing is the most widely used rolling bearing. The basic type of deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls and a set of cages. Its characteristics are small frictional resistance and high rotational speed. It can be used on parts that can bear radial loads or combined loads with both radial and axial actions simultaneously, and can also be used on parts that bear axial loads, such as small power motors, automotive and tractor gearboxes, machine tool gearboxes, general machinery, tools, etc.

[0003] The main load borne by the cage is the centrifugal force. After the cage is affected by the centrifugal force, there are the following three impacts on it:

[0004] 1) The centrifugal force will cause the deformation of the cage;

[0005] 2) The centrifugal force can strengthen the creep of the cage and further accelerate the deformation of the cage;

[0006] 3) The centrifugal force causes internal stress in the cage.

[0007] The existing cages have the following disadvantages:

[0008] (1) The centrifugal force will cause the deformation of the cage.

[0009] When the bearing runs at high speed, the cage will be affected by the centrifugal force and expand and deform in the radial direction. The higher the rotational speed, the greater the centrifugal force and the greater the expansion deformation. Since the geometric shape of the crown cage is asymmetric axially and the material at the ball pocket position of the cage is circular and closed-loop continuous, the external expansion deformation will be smaller. The positions of the strengthening part and the claw part of the cage are similar to the long bow structure, and its material is discontinuous in the circular direction. Therefore, compared with the ball position, the degree of expansion deformation towards the outside will be greater. And the farther away from the ball shaft position, the greater the expansion deformation, eventually leading to the external distortion deformation of the cage. Seriously, the outer circular surface of the cage can even interfere with the bearing outer ring.

[0010] (2) The centrifugal force can strengthen the creep of the cage and further accelerate the deformation of the cage.

[0011] Under the influence of specific temperature and a small constant external force (such as tensile force, pressure, or torsion) on the oil of polymer materials, the deformation of polymer materials will gradually increase with the passage of time. During the operation of the bearing, the cage is continuously affected by centrifugal force and the impact force of rolling elements. As the operation time increases, the bracket may undergo a certain degree of irreversible creep. Creep exacerbates the deformation of the cage, thus increasing the risk of interference between the cage and the outer ring of the bearing.

[0012] (3) The centrifugal force generates internal stress in the cage.

[0013] When the bearing rotates at high speed, due to the action of centrifugal force, the bracket is distorted, the strengthening part and the position of the pawl turn outward, increasing the internal stress at the bottom of the cage pocket. The higher the rotational speed, the greater the deformation of the cage and the greater the internal stress. The material at the bottom of the cage pocket is the least, making it the weakest and most easily damaged position.

[0014] (4) Friction heat is generated between the cage and the balls.

[0015] When a high-speed angular contact ball bearing rotates at high speed, a large amount of heat will be generated. If the heat dissipation is insufficient or not timely, it will cause the working temperature of the bearing to rise, shorten the service life of the bearing, reduce the reliability of the bearing, and even cause early failure. Usually, the circulation of lubricating oil is used to reduce the temperature in the working area of the bearing. The lubricating oil passes through the gap between the cage pocket and the balls, taking away the heat generated by the high-speed rotation of the bearing to cool the bearing. However, the cage makes the internal space of the bearing smaller, the flow area of the lubricating oil passing through the bearing cage is smaller, and the circulation effect of the lubricating oil is poor, resulting in a poor cooling effect of the lubricating oil, seriously affecting the normal operation performance of the bearing.

[0016] (5) Wear between the cage and the balls.

[0017] When a high-speed ball bearing rotates, friction inevitably occurs between the cage and the balls, causing wear between the cage and the balls. During long-term use, it is easy to cause a reduction in the inner diameter of the cage, and in severe cases, metal powder will fall off, resulting in fatigue damage of the bearing.

[0018] Therefore, various influences on the cage should be fully considered in the design. Utility Model Content

[0019] The purpose of the present utility model is to provide an efficient high-speed deep groove ball bearing.

[0020] To solve the above technical problems, the present utility model provides a high-speed deep groove ball bearing, including:

[0021] Inner ring of the bearing;

[0022] Outer ring of the bearing;

[0023] A cage located between the inner ring and the outer ring of the bearing; an arcuate pocket with a superior arc cross-section is formed in the cage, and a circular chamfer is provided at the intersection of the bottom of the cage and the pocket.

[0024] A ball installed in the pocket, and the pocket semi-encloses the ball.

[0025] Preferably, an oil storage groove for storing grease is formed at the middle position of the pocket.

[0026] Preferably, positioning protrusions are provided on the inner side wall of the pocket.

[0027] The positioning protrusions are used to position the balls.

[0028] Preferably, a positioning protrusion is symmetrically provided on each of the two inner side walls of the pocket.

[0029] Each of the positioning protrusions includes two convex peaks.

[0030] Preferably, arc-shaped grooves are formed on the opposite sides of the inner ring and the outer ring of the bearing.

[0031] The balls are located in the arc-shaped grooves of the inner ring and the outer ring of the bearing.

[0032] Preferably, a plurality of weight-reducing grooves are formed in the cage.

[0033] Preferably, the weight-reducing grooves are located directly above the corresponding pockets.

[0034] Preferably, the number of the weight-reducing grooves is the same as that of the pockets and they correspond one by one.

[0035] Preferably, nine pockets are circumferentially and evenly formed at the bottom of the cage.

[0036] Nine weight-reducing grooves are circumferentially and evenly formed at the top of the cage.

[0037] Preferably, the cage is a glass fiber reinforced polyimide cage.

[0038] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0039] In the present utility model, a circular chamfer is provided at the intersection of the bottom of the cage of the high-speed ball bearing and the pocket, which facilitates the embedding of the balls into the pockets.

[0040] In the present utility model, the cross-section of the pocket is a superior arc greater than 180°, so that the pocket semi-encloses the balls, reducing the contact area between the pocket and the balls and reducing the wear between the two.

[0041] The utility model only uses one cage, which can reduce the overall thickness;

[0042] The utility model is provided with weight-reducing holes at the top of the cage, which can reduce the overall weight of the cage;

[0043] The oil storage groove of the utility model can store grease, and the grease in the oil storage groove is used to maintain sufficient lubrication between the cage and the balls, reduce the heat generated by rolling friction, increase the lubrication effect of the bearing, and thus extend the service life of the bearing;

[0044] The utility model is provided with positioning protrusions on the inner walls of both sides of the pocket holes, so as to position the balls through the positioning protrusions. When the high-speed ball bearing rotates, the balls only generate friction with the positioning protrusions, reducing the contact area between the pocket holes and the balls and reducing the wear between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The following further describes in detail the specific embodiments of the utility model with reference to the drawings.

[0046] Figure 1 is a schematic structural diagram of the high-speed ball bearing of the utility model;

[0047] Figure 2 is a schematic structural diagram of the cage in Embodiment 1;

[0048] Figure 3 is a schematic structural diagram of the connection between the cage and the balls in Embodiment 1;

[0049] Figure 4 is a schematic structural diagram of the cage in Embodiment 2;

[0050] Figure 5 is a schematic structural diagram of the connection between the cage and the balls in Embodiment 2;

[0051] Figure 6 is a schematic structural diagram of the cage in Embodiment 3;

[0052] Figure 7 is a schematic structural diagram of the connection between the cage and the balls in Embodiment 3;

[0053] In the figure:

[0054] 1 - bearing inner ring; 2 - bearing outer ring; 3 - cage; 31 - pocket hole; 32 - positioning protrusion; 321 - convex peak; 33 - circular chamfer; 34 - weight-reducing groove; 35 - oil storage groove; 4 - ball; 5 - arc groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific implementations disclosed below.

[0056] The terms used in one or more embodiments of this specification are for the purpose of describing specific embodiments only and are not intended to limit one or more embodiments of this specification. The singular forms "a", "the", and "said" used in one or more embodiments of this specification and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0057] It should be understood that although the terms first, second, etc. may be used in one or more embodiments of this specification to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0058] The following further describes the present utility model in detail with reference to the accompanying drawings:

[0059] The present utility model provides a high-speed deep groove ball bearing, including:

[0060] Inner bearing ring 1;

[0061] Outer bearing ring 2;

[0062] A cage 3, which is located between the inner bearing ring 1 and the outer bearing ring 2; the cage 3 is provided with a pocket 31 having a superior arc-shaped vertical section, and the intersection of the bottom of the cage 3 and the pocket 31 is a circular chamfer 33;

[0063] Ball bearings 4, which are installed in the pockets 31, and the pockets 31 semi-encase the ball bearings 4.

[0064] Preferably, an oil storage groove 35 for storing grease is provided at the middle position of the pocket 31.

[0065] Preferably, positioning protrusions 32 are provided on the inner side wall of the pocket 31;

[0066] The positioning protrusions 32 are used to position the ball bearings 4.

[0067] Preferably, a positioning protrusion 32 is symmetrically arranged on each of the inner walls on both sides of the pocket hole 31;

[0068] Each of the positioning protrusions 32 includes two convex peaks 321.

[0069] Preferably, arc-shaped grooves 5 are formed on the opposite sides of the inner ring 1 and the outer ring 2 of the bearing;

[0070] The ball 4 is located in the arc-shaped grooves 5 of the inner ring 1 and the outer ring 2 of the bearing.

[0071] Preferably, a plurality of weight-reducing grooves 34 are formed in the cage 3.

[0072] Preferably, the weight-reducing grooves 34 are located directly above the corresponding pocket holes 31.

[0073] Preferably, the number of the weight-reducing grooves 34 is the same as the number of the pocket holes 31 and they correspond one by one.

[0074] Preferably, nine pocket holes 31 are circumferentially and evenly formed at the bottom of the cage 3;

[0075] Nine weight-reducing grooves 34 are circumferentially and evenly formed at the top of the cage 3.

[0076] Preferably, the cage 3 is a glass fiber reinforced polyimide cage.

[0077] In order to better illustrate the technical effects of the present invention, the following specific embodiments are provided to illustrate the above technical process:

[0078] Embodiment 1. A high-speed deep groove ball bearing, as Figure 1 , 2 , 3 shown;

[0079] Taking the 6207 and 6009 bearings commonly used in the electric drive system of new energy vehicles as examples, a series of designs of high-speed deep groove ball cages are carried out; the application conditions of high-speed deep groove ball bearings in new energy vehicles require that the cage has the properties of light weight, good self-lubrication and high strength.

[0080] Compared with the traditional steel stamping cage, the glass fiber reinforced engineering plastic has a lighter mass and lower friction performance, and becomes the preferred raw material to meet the high-speed requirements. The lightweight cage carrying the rotating body has less friction during high-speed operation than other carrying methods.

[0081] Therefore, when selecting raw materials for high-speed cages from existing conventional materials, it is preferably recommended to use glass fiber-reinforced polyimide (PA46-GF). However, due to the structural characteristics of deep groove ball bearings, when using this raw material, the product structure is preferably not designed as a window type, but usually an asymmetric crown type is selected for design.

[0082] When the high-speed ball bearing rotates, the main loads on the cage 3 are centrifugal force and the force generated by the rolling elements on it. Starting from the centrifugal force when the entire bearing rotates itself, at a certain rotational speed and during rapid acceleration or deceleration, the influence of the balls 4 on the cage 3 gradually accumulates. By comparing and analyzing one by one, the influence of each condition on the cage 3 is clarified, and the corresponding high-speed cage design is optimized according to the results.

[0083] In this embodiment, the cage 3 is provided with a pocket 31 whose vertical cross-section is a superior arc shape, and there is a notch at the lower part of the pocket 31, so that the pocket 31 semi-envelops the balls 4, reducing the contact area between the pocket 31 and the balls 4 and reducing the wear between the two.

[0084] In this embodiment, the intersection of the bottom of the cage 3 of the high-speed ball bearing and the pocket 31 is a circular chamfer 33, which is convenient for inserting the balls 4 into the pocket 31. Arc-shaped grooves 5 are provided on the opposite sides of the inner ring 1 and the outer ring 2 of the bearing, and the balls 4 are located in the arc-shaped grooves 5 of the inner ring 1 and the outer ring 2 of the bearing. The diameter of the vertical cross-section of the pocket 31 gradually increases from the outer diameter surface to the inner diameter surface, which can better fix the balls 4.

[0085] Compared with the existing high-speed ball bearings that use two cages 3 to fix the balls 4, only one cage 3 is used in this embodiment, which can reduce the overall thickness. A weight-reducing groove 34 is provided at the top of the cage 3. The number of weight-reducing grooves 34 is the same as and corresponds one by one to the number of pockets 31. The weight-reducing groove 34 is located directly above the pocket 31, and the design of the weight-reducing groove 34 can reduce the overall weight of the cage 3.

[0086] The data of the high-speed deep groove ball bearing in this embodiment are as follows: the PCD diameter is φ53.5 cm; the diameter of the balls 4 is φ11.112 cm; the number of pockets 31 is 9; the product material is PA46-GF30; the designed rotational speed is 2 - 2.5W rpm.

[0087] Embodiment 2, A high-speed deep groove ball bearing with an oil storage groove structure, as Figure 4 、 5 shown; Different from Embodiment 1, this embodiment also adds an oil storage groove structure, and the others are the same as Embodiment 1, which will not be elaborated here;

[0088] An oil storage groove 35 is provided at the middle position of the pocket 31, and the oil storage groove 35 is located at the middle position of the side wall of the pocket 31.

[0089] The oil storage tank 35 is communicated with both the inner and outer sides of the pocket 31. Grease needs to be added to the oil storage tank 35. During the high-speed operation of the deep groove ball bearing, the grease in the oil storage tank 35 in the pocket 31 is used to maintain sufficient lubrication between the cage 3 and the balls 4, reducing the heat generated by rolling friction.

[0090] Embodiment 3: A high-speed deep groove ball bearing with an anti-wear structure, as Figure 6 , 7 shown; Different from Embodiment 1, this embodiment also adds an anti-wear structure, and the others are the same as Embodiment 1, which will not be elaborated here;

[0091] Positioning protrusions 32 are provided on both inner walls of the pocket 31. Each positioning protrusion 32 positions the balls 4 through two convex peaks 321. When the high-speed ball bearing rotates, the balls 4 only rub against the two convex peaks 321, reducing the contact area between the pocket 31 and the balls 4 and reducing the wear between the two.

[0092] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A high-speed deep groove ball bearing, characterized in that, Comprising: Inner ring of bearing (1); Outer ring of bearing (2); Cage (3), which is located between the inner ring of bearing (1) and the outer ring of bearing (2); an arcuate pocket (31) with a superior arc-shaped vertical section is formed on the cage (3), and the intersection of the bottom of the cage (3) and the pocket (31) is a circular chamfer (33); positioning protrusions (32) are arranged on the inner side wall of the pocket (31), and the positioning protrusions (32) are used for positioning the balls (4); Balls (4), which are installed in the pockets (31), and the pockets (31) semi-wrap the balls (4).

2. The high-speed deep groove ball bearing according to claim 1, wherein: An oil storage groove (35) for storing grease is formed at the middle position of the pocket (31).

3. The high-speed deep groove ball bearing according to claim 1, wherein: One positioning protrusion (32) is symmetrically arranged on each of the two inner side walls of the pocket (31); Each of the positioning protrusions (32) includes two convex peaks (321).

4. The high-speed deep groove ball bearing according to claim 1, wherein: Arc-shaped grooves (5) are formed on the opposite sides of the inner ring of bearing (1) and the outer ring of bearing (2); The balls (4) are located in the arc-shaped grooves (5) of the inner ring of bearing (1) and the outer ring of bearing (2).

5. The high-speed deep groove ball bearing according to claim 1, wherein: A plurality of weight-reducing grooves (34) are formed on the cage (3).

6. The high-speed deep groove ball bearing according to claim 5, wherein: The weight-reducing grooves (34) are located directly above the corresponding pockets (31).

7. The high-speed deep groove ball bearing according to claim 6, wherein: The number of the weight-reducing grooves (34) is the same as that of the pockets (31), and they correspond one by one.

8. The high-speed deep groove ball bearing according to claim 7, wherein: Nine pockets (31) are circumferentially and evenly formed at the bottom of the cage (3); Nine weight-reducing grooves (34) are circumferentially and evenly formed at the top of the cage (3).

9. The high-speed deep groove ball bearing according to claim 1, wherein: The cage (3) is a glass fiber reinforced polyimide cage.

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