Deep groove ball bearing with flange and speed reducer

Abstract

According to the deep groove ball bearing with the flange and the speed reducer, an inner ring mounting hole is formed in the center of the flange plate, and a channel concentric with the inner ring mounting hole is formed in the inner wall of the inner ring mounting hole in the circumferential direction; the inner ring is concentrically arranged in the inner ring mounting hole, rolling bodies are arranged between the inner ring and the flange plate, and the rolling bodies move along the channel; according to the structure, a bearing connecting pressing plate is omitted, then the traditional bearing outer ring and the flange plate form an integrated structure, and a part of the flange plate serves as the bearing outer ring, so that the structure is simplified, the assembling process that the bearing and the pressing plate are connected through a clamping spring is avoided, and the problems that local stress concentration and matching clearance scattering difference are difficult to control are solved; the transmission shaft and the box body of the speed reducer are easy to assemble, and the reliability is good.

Description

Technical Field

[0001] The present application relates to the technical field of reducers for new energy vehicles, and in particular to a deep groove ball bearing with a flange and a reducer. Background Art

[0002] Bearings are important parts in mechanical transmission. When bearings are used in high temperature, closed and complex environments, the reliability of bearings is particularly important. Traditional bearings required in this part are outer rings with a connecting pressure plate. The pressure plate and the bearing are connected by a locking structure. The locking structure is to install a retaining ring in the retaining groove of the outer ring of the bearing, and the retaining ring is used to lock the bearing. However, the ring wall of the retaining ring is generally thin. When the axial force is large, the retaining ring is easy to break at the bottom of the retaining groove, which has poor reliability and increases maintenance costs.

[0003] The transmission shaft in the reducer is supported by the bearing and the housing. Traditionally, the bearing is generally positioned on the housing by a pressure plate. The conventional connection method between the bearing and the pressure plate is to set an irregularly shaped retaining spring between the bearing and the pressure plate, and the retaining spring is sleeved on the outer ring of the bearing.

[0004] The shortcomings of the above structure are:

[0005] (1) The shape of the retaining ring is irregular, the structure is complex, the processing and manufacturing are difficult, the installation is difficult, the reliability is poor, the assembly process of the pressure plate and the bearing is complicated, the operation is cumbersome, and the assembly efficiency is low;

[0006] (2) It is difficult to control the clearance difference after the bearing parts are assembled with the pressure plate and the box;

[0007] (3) The rigidity of the pressure plate and the outer ring of the bearing is poor, and local deformation (the connection between the pressure plate and the retaining spring of the bearing) is prone to stress concentration. Summary of the invention

[0008] The embodiments of the present application provide a deep groove ball bearing with a flange and a reducer to solve the problems in the related art that the bearing in the reducer and the pressure plate are connected by a retaining spring, which causes inconvenience in assembly and local stress concentration.

[0009] In a first aspect, a deep groove ball bearing with a flange is provided, comprising:

[0010] The flange has an inner ring mounting hole at its center, and a groove cocentrically arranged on the inner wall of the inner ring mounting hole is circumferentially arranged;

[0011] The inner ring is co-centeredly arranged in the inner ring mounting hole, and rolling bodies are arranged between the inner ring and the flange, and the rolling bodies move along the channel.

[0012] In some embodiments, the inner ring is made of bearing steel;

[0013] The flange is made of carbon structural steel or alloy structural steel.

[0014] In some embodiments, a quenching layer is provided inside the channel.

[0015] In some embodiments, the inner ring and the flange are both made of bearing steel.

[0016] In some embodiments, a plurality of box mounting holes are provided on the flange and located outside the inner ring mounting holes.

[0017] In some embodiments, the flange includes a cylindrical portion and a connecting plate portion that are integrally formed and connected; one end of the cylindrical portion in the axial direction is connected to the connecting plate portion;

[0018] The box body mounting hole is arranged on the connecting plate portion, and the inner ring mounting hole is arranged in the cylindrical portion and is concentric with the axis of the cylindrical portion.

[0019] In some embodiments, the outer contour of the connecting plate portion is polygonal or circular.

[0020] In some embodiments, a retainer is provided between the rolling elements, the rolling elements include spheres, and the spheres are made of bearing steel or ceramics; the retainer is made of steel or plastic.

[0021] In some embodiments, a sealing ring is provided between the inner ring and the flange.

[0022] In a second aspect, a reducer is provided, which includes: a deep groove ball bearing with a flange.

[0023] The beneficial effects of the technical solution provided by this application include:

[0024] The embodiment of the present application provides a deep groove ball bearing and a reducer with a flange. Since an inner ring mounting hole is provided at the center of the flange, a groove arranged concentrically with the inner ring mounting hole is circumferentially provided on the inner wall of the inner ring mounting hole; the inner ring is arranged concentrically in the inner ring mounting hole, and rolling bodies are arranged between the inner ring and the flange, and the rolling bodies move along the groove; the above structure eliminates the bearing connecting pressure plate, and then forms an integrated structure with the traditional bearing outer ring and flange, and a part of the flange is used as the bearing outer ring, thereby simplifying the structure, avoiding the assembly process of the bearing and the pressure plate connected by a retaining spring, and the problems of local stress concentration and difficult to control matching clearance dispersion, so that the transmission shaft and the reducer housing are easy to assemble and have good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A structural view of a deep groove ball bearing with a flange provided in an embodiment of the present application;

[0027] Figure 2 Provided in the embodiments of this application Figure 1 AA section enlarged view;

[0028] Figure 3 A schematic cross-sectional view of a flange provided in an embodiment of the present application.

[0029] In the figure: 1. flange; 101. inner ring mounting hole; 102. channel; 103. housing mounting hole; 104. cylindrical portion; 105. connecting plate portion; 2. inner ring; 3. rolling element; 4. retainer; 5. sealing ring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] The embodiments of the present application provide a deep groove ball bearing with a flange and a reducer to solve the problems in the related art that the bearing in the reducer and the pressure plate are connected by a retaining spring, which causes inconvenience in assembly and local stress concentration.

[0032] A deep groove ball bearing with a flange is mainly used at both ends of the support shaft in the reducer of new energy vehicles and is connected to the reducer housing.

[0033] See also Figure 1-Figure 3 , a deep groove ball bearing with a flange, comprising:

[0034] The flange 1 has an inner ring mounting hole 101 at its center, and a channel 102 coaxially arranged on the inner wall of the inner ring mounting hole 101 is provided;

[0035] The inner ring 2 is co-centeredly arranged in the inner ring mounting hole 101 , and a rolling body 3 is arranged between the inner ring 2 and the flange 1 , and the rolling body 3 moves along the channel 102 .

[0036] The above structure eliminates the bearing connection pressure plate, and then forms the traditional bearing outer ring and flange into an integrated structure, with a part of the flange 1 used as the bearing outer ring, thereby simplifying the structure and avoiding the assembly process of the bearing and the pressure plate connected by a retaining spring, as well as the problems of local stress concentration and difficult to control matching clearance dispersion, making it easy to assemble the transmission shaft and the reducer housing and having good reliability.

[0037] In the above, the deep groove ball bearing with flange is directly installed on the transmission shaft during connection, and then the flange 1 is directly connected to the housing of the reducer. The above does not need to consider the problems brought by the original structure, such as irregular shape of the retaining ring, complex structure, difficult processing and manufacturing, difficult installation, poor reliability, many assembly processes between the pressure plate and the bearing, cumbersome operation, and low assembly efficiency; the problem that the clearance difference between the bearing parts, the pressure plate and the housing is difficult to control after assembly; the problem that the rigidity of the pressure plate and the outer ring of the bearing is poor, and local deformation is prone to stress concentration. Because the flange is directly an integrated structure with the outer ring of the bearing, the above structure does not exist, and this problem does not exist.

[0038] In some preferred embodiments, considering the actual production and manufacturing, the following settings are provided to facilitate processing:

[0039] The inner ring 2 is made of bearing steel;

[0040] The flange 1 is made of carbon structural steel or alloy structural steel. The material of the flange 1 is different from that of the inner ring 2, and has better forming performance and is easy to machine. However, considering that the use of different materials will have a certain impact on the performance of the bearing itself, there are also the following settings:

[0041] A quenching layer is provided inside the channel 102. The performance parameters caused by different thickness of the quenching layer are also different, and corresponding settings can be made according to different needs. The quenching layer is treated by induction quenching. After heat treatment, the hardness is HRC60-64, and the depth of the hardened layer is 1.5-3mm, which meets the working requirements of the bearing.

[0042] Among them, the general steps of induction hardening treatment mainly include the following steps:

[0043] Induction heating: The workpiece is placed in an inductor made of a copper tube. Alternating current of a certain frequency is passed through the inductor to generate an alternating magnetic field with the same frequency, thereby generating an induced current (eddy current) of the same frequency in the workpiece; this eddy current will quickly heat the surface of the workpiece to the quenching temperature.

[0044] Quenching: When the workpiece surface is heated to the required temperature, it is quickly removed from the inductor and quenched. Quenching can be performed by water spray, oil quenching or other cooling media to quickly cool the workpiece surface, form martensitic structure, and improve the hardness and wear resistance of the workpiece.

[0045] Cooling: After quenching, the workpiece needs to be fully cooled to ensure the uniformity and stability of the hardened layer; the cooling method can be selected according to the material and size of the workpiece. Common cooling media include water, oil, etc. Principle of induction heating: Induction heating utilizes the skin effect, that is, the current is mainly distributed on the surface of the workpiece, and the internal current density is small. The higher the frequency of the high-frequency current, the thinner the surface layer where the current is concentrated. Process parameter selection: The process parameters of induction quenching include the frequency of the inductor, the gap between the workpiece and the inductor, the quenching time and the cooling method. The selection of these parameters needs to be determined based on the material, size and required hardened layer depth of the workpiece.

[0046] Common induction hardening methods for gear rings include induction hardening along the tooth groove, induction hardening by tooth, rotary induction hardening and dual-frequency induction hardening. These methods are suitable for gear rings of different diameters and moduli, and can achieve efficient quenching by precisely controlling the gap between the inductor and the workpiece.

[0047] Of course, this application does not exclude the situation that both the inner ring 2 and the flange 1 are made of bearing steel. This is because the speed of the motor of new energy is higher than that of the traditional fuel engine, and the wear resistance requirements of the bearing are higher, but the material of the flange generally focuses on the structural strength, so quenching treatment is required; and general traditional fuel engines can be used for bearings with low wear resistance requirements, that is, bearings with both the inner ring 2 and the flange 1 made of bearing steel.

[0048] In some preferred embodiments, the flange 1 includes a cylindrical portion 104 and a connecting plate portion 105 which are integrally formed and connected; one end of the cylindrical portion 104 in the axial direction is connected to the connecting plate portion 105;

[0049] The box mounting hole 103 is arranged on the connecting plate portion 105, and the inner ring mounting hole 101 is arranged in the cylindrical portion 104 and is concentric with the axis of the cylindrical portion 104. The outer contour of the connecting plate portion 105 is polygonal or circular. The polygon includes a triangle, a quadrilateral, a hexagon, an octagon, etc. The number of the box mounting holes 103 is also changed and varied as needed.

[0050] Therefore, the deep groove ball bearing with flange produces the following positive effects: the flange bearing has high integration, is easy to install and assemble, and has high assembly efficiency; the material of the flange 1 is different from that of the inner ring 2, has better forming performance, and is easy to machine; the groove 102 is induction hardened, and a quenching layer is formed after heat treatment. It meets the working requirements of the bearing; the structure of the flange 1 is equivalent to the outer ring of the bearing with a flange, and the axial and radial clearance accuracy of the housing is high, the positioning is accurate, the connection is reliable, and it is not easy to fall off; the bearing disassembly and replacement operation is simple.

[0051] The flange 1 is formed in an integrated manner, which is equivalent to the rigidity of the traditional bearing outer ring and the flange, which can reduce the stress concentration caused by local deformation and solve the problem of deformation and stress concentration at the connection between the pressure plate and the bearing retaining spring. The present invention has the characteristics of simple structure, high reliability of bearing fixed installation, high positioning accuracy, convenient disassembly and assembly, and good rigidity of the ring support. It is mainly used at both ends of the support shaft in the reducer of new energy vehicles. It mainly solves the problems of difficult assembly between parts of traditional bearings with pressure plates, poor rigidity of parts, high difficulty in installation and disassembly of finished bearings, low reliability, and slow assembly efficiency.

[0052] In some preferred embodiments, a retainer 4 is provided between the rolling elements 3, the rolling elements 3 include balls, the balls are made of bearing steel or ceramics; the retainer 4 is made of steel or plastic. A sealing ring 5 is provided between the inner ring 2 and the flange 1. Of course, the sealing ring 5 may not be provided, and the selection is made according to the needs.

[0053] The above deep groove ball bearing with flange realizes the functions of high integration, easy installation and assembly, and high assembly efficiency; the outer ring material of the deep groove ball bearing with flange is different from that of the inner ring, has better forming performance and is easy to machine; the groove 102 is induction hardened and meets the working requirements of the bearing after heat treatment; the flange 1 and the housing have high axial and radial clearance accuracy, accurate positioning, reliable connection, and are not easy to fall off; the above structure also makes the bearing disassembly and replacement operation simple.

[0054] The invention has the characteristics of simple structure, high reliability of bearing fixing and installation, high positioning accuracy, convenient disassembly and assembly, and good ring support rigidity. It is mainly used for supporting both ends of the shaft in the reducer of new energy vehicles.

[0055] Therefore, the present application also proposes a reducer, which includes: a deep groove ball bearing with a flange; the deep groove ball bearing with a flange is located at both ends of a support shaft in the reducer and is connected to a housing of the reducer.

[0056] In the above, the deep groove ball bearing with flange is directly installed on the transmission shaft during connection, and then the flange 1 is directly connected to the housing of the reducer. The above does not need to consider the problems brought by the original structure, such as irregular shape of the retaining ring, complex structure, difficult processing and manufacturing, difficult installation, poor reliability, many assembly processes between the pressure plate and the bearing, cumbersome operation, and low assembly efficiency; the problem that the clearance difference between the bearing parts, the pressure plate and the housing is difficult to control after assembly; the problem that the rigidity of the pressure plate and the outer ring of the bearing is poor, and local deformation is prone to stress concentration. Because the flange is directly an integrated structure with the outer ring of the bearing, the above structure does not exist, and this problem does not exist.

[0057] Beneficial effects of this application:

[0058] (1) The bearing connection pressure plate is removed, and the traditional bearing outer ring and flange are integrated into an integrated structure. A part of the flange 1 is used as the bearing outer ring, thereby simplifying the structure and avoiding the assembly process of the bearing and the pressure plate connected by a retaining spring, as well as the problems of local stress concentration and difficult to control the matching clearance dispersion, making it easy to assemble the transmission shaft and the reducer housing and having good reliability.

[0059] (2) The flanged bearing has high integration, is easy to install and assemble, and has high assembly efficiency; the material of the flange 1 is different from that of the inner ring 2, has better forming performance, and is easy to machine; the groove 102 is induction hardened, and a quenching layer is formed after heat treatment. It meets the working requirements of the bearing; the structure of the flange 1 is equivalent to the outer ring of the bearing with a flange, and the axial and radial clearances with the housing are accurate, the positioning is accurate, the connection is reliable, and it is not easy to fall off; the bearing disassembly and replacement are simple. The flange 1 is integrally formed, which is equivalent to the rigidity of the traditional bearing outer ring and the flange, which can reduce the stress concentration caused by local deformation and solve the problem of deformation and stress concentration at the connection between the pressure plate and the bearing retaining spring.

[0060] Without violating the spirit and claims of the present invention, various similar expressions may be made, such as changing the shape or material of the outer ring or flange, or changing the type of bearing, sealing material, etc. Such changes all fall within the scope of protection of the present invention.

[0061] The reducer of new energy vehicles has two main functions: reducing the speed and increasing the torque; specifically, in new energy vehicles, the application of reducers is mainly reflected in the following aspects:

[0062] Speed ​​matching between the drive motor and the wheels: The drive motor of an electric vehicle usually rotates at a high speed, while the wheels need to be driven at a low speed to maintain a stable driving state. Therefore, the speed reducer is used to reduce the high speed rotation of the motor to a low speed suitable for driving the wheels, so as to achieve speed matching between the two.

[0063] Improve torque output: By increasing the number of gear pairs and the number of teeth, the reducer can significantly increase the output torque, allowing electric vehicles to better cope with uphill, acceleration and other working conditions.

[0064] Protect the drive motor: The reducer can absorb and disperse part of the impact load, reduce the wear on the drive motor and extend its service life.

[0065] Improve energy utilization efficiency: Since the reducer reduces the speed of the motor, it reduces energy loss and improves the energy utilization efficiency of the entire system.

[0066] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0067] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0068] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A deep groove ball bearing with flange, characterized in that: It includes: A flange (1) is provided with an inner ring mounting hole (101) at the center thereof, and a channel (102) coaxially arranged on the inner wall of the inner ring mounting hole (101); The inner ring (2) is co-centeredly arranged in the inner ring mounting hole (101), and a rolling body (3) is arranged between the inner ring and the flange (1), and the rolling body (3) moves along the channel (102).

2. The deep groove ball bearing with flange according to claim 1, characterized in that: The inner ring (2) is made of bearing steel; The flange (1) is made of carbon structural steel or alloy structural steel.

3. The deep groove ball bearing with flange according to claim 2, characterized in that: A quenching layer is provided inside the channel (102).

4. The deep groove ball bearing with flange according to claim 1, characterized in that: The inner ring (2) and the flange (1) are both made of bearing steel.

5. The deep groove ball bearing with flange according to claim 1, characterized in that: A plurality of box mounting holes (103) are provided on the flange (1) and are located outside the inner ring mounting hole (101).

6. The deep groove ball bearing with flange according to claim 5, characterized in that: The flange (1) comprises a cylindrical portion (104) and a connecting plate portion (105) which are integrally formed and connected; one end of the cylindrical portion (104) in the axial direction is connected to the connecting plate portion (105); The box body mounting hole (103) is arranged on the connecting plate portion (105), and the inner ring mounting hole (101) is arranged in the cylindrical portion (104) and is concentric with the axis of the cylindrical portion (104).

7. The deep groove ball bearing with flange according to claim 6, characterized in that: The outer contour of the connecting plate portion (105) is polygonal or circular.

8. The deep groove ball bearing with flange according to claim 1, characterized in that: A retainer (4) is arranged between the rolling bodies (3); the rolling bodies (3) include balls made of bearing steel or ceramics; and the retainer (4) is made of steel or plastic.

9. The deep groove ball bearing with flange according to claim 8, characterized in that: A sealing ring (5) is provided between the inner ring (2) and the flange (1).

10. A reducer, characterized in that: It includes: A deep groove ball bearing with flange as claimed in any one of claims 1 to 9.

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