Transmission structure, motor and method for assembling the same

Abstract

The application discloses a transmission structure, a motor and an assembling method thereof, and relates to the technical field of electric driving, wherein the transmission structure comprises a shell, a motor shaft and an elastic piece; a sealing cover is integrally formed on the inner side wall of the shell; the motor shaft has opposite first and second ends, the first end is provided with a bearing, the motor shaft and the bearing are integrally installed into the shell, and the first end and the bearing are inserted into the sealing cover; and the elastic piece is arranged between the bearing and the sealing cover in the axial direction of the motor shaft. The technical scheme provided by the application can solve the problem of a large number of parts in the assembling process.

Description

Technical Field

[0001] This invention relates to the field of electric drive technology, and in particular to a transmission structure, a motor and its assembly method. Background Technology

[0002] In the motor system, the motor shaft of the suspension motor can only be assembled from one side. During assembly, the bearing needs to be installed in the housing first, and then the bearing is positioned using a snap ring. Then the motor shaft and rotor are pressed into the housing. In order to avoid damaging the bearing during the pressing process, an installation port needs to be opened on the housing. The installation port is first opened with a plug so that a tool can be inserted into the housing from the installation port and press against the inner ring of the bearing before the pressing process is carried out. Finally, the installation port needs to be closed with a plug and the plug is sealed with an O-ring, resulting in a large number of assembly parts for the motor. Summary of the Invention

[0003] The main objective of this invention is to propose a transmission structure, a motor, and an assembly method thereof, aiming to solve the problem of a large number of parts during the assembly process.

[0004] To achieve the above objectives, the present invention proposes a transmission structure comprising:

[0005] The housing has an integrally formed sealing cover on its inner sidewall;

[0006] The motor shaft has a first end and a second end opposite to each other. A bearing is sleeved on the first end. The motor shaft and the bearing are integrally installed into the housing, and the first end and the bearing are inserted into the sealing cover.

[0007] An elastic element is disposed between the bearing and the sealing cover in the axial direction along the motor shaft.

[0008] In one embodiment of this application, the transmission structure further includes a wear-resistant component, which is disposed between the end face of the second end and the housing in the axial direction along the motor shaft.

[0009] In one embodiment of this application, the housing has an inner mounting wall opposite to the end face of the second end, and the wear-resistant component is connected to the inner mounting wall.

[0010] In one embodiment of this application, the wear-resistant component and the housing are integrally formed.

[0011] In one embodiment of this application, the wear-resistant component is a gasket.

[0012] In one embodiment of this application, the housing includes a first outer shell and a second outer shell connected axially along the motor shaft, and the sealing cover is integrally formed on the inner sidewall of the first outer shell;

[0013] The wear-resistant component is disposed between the end face of the second end and the second outer shell.

[0014] In one embodiment of this application, the elastic element is a wave spring.

[0015] To achieve the above objectives, the present invention also provides an electric motor, comprising:

[0016] The transmission structure described above;

[0017] The rotor is disposed within the housing and located outside the motor shaft;

[0018] The stator is disposed within the housing and located outside the rotor.

[0019] To achieve the above objectives, the present invention also proposes an assembly method based on the motor described above, comprising the following steps:

[0020] Install the elastic element into the sealing cover of the housing;

[0021] Press the motor shaft into the rotor;

[0022] The bearing is fitted onto the first end of the motor shaft;

[0023] The motor shaft, the rotor, and the bearing are pressed into the housing so that the first end of the motor shaft and the bearing are inserted into the sealing cover and the bearing abuts against the elastic element.

[0024] In one embodiment of this application, prior to the step of "pressing the motor shaft, the rotor, and the bearing together into the housing", the method further includes:

[0025] Install the wear-resistant parts into the housing;

[0026] The stator is installed into the housing.

[0027] When the technical solution of this invention is applied to an electric motor, during the assembly process, the motor shaft is first pressed into the rotor; then the bearing is fitted into the first end of the motor shaft; then the motor shaft, rotor, and bearing are assembled into a housing, and the first end of the motor shaft and the bearing are inserted into the sealing cover to form a seal through the sealing cover on the housing. This eliminates the need to open an installation port on the housing or use a plug to seal the installation port, saving the use of plugs, snap rings, and O-rings, thus solving the problem of a large number of parts during the assembly process.

[0028] Furthermore, since the use of snap rings for bearing positioning is eliminated, this solution can eliminate the gap between the bearing and the seal by placing the elastic element between the bearing and the seal along the axial direction of the motor shaft, thereby enabling precise bearing positioning. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 A cross-sectional view of an embodiment of the motor provided by the present invention;

[0031] Figure 2 for Figure 1 A magnified view of a section at point B in the middle;

[0032] Figure 3 for Figure 1 A magnified view of a section at point C;

[0033] Figure 4 This is a flowchart of an embodiment of the motor assembly method provided by the present invention.

[0034] Explanation of icon numbers:

[0035] label name label name 1000 motor 21 First end 100 Transmission structure 22 Second end 10 case 30 bearings 11 First outer shell 40 elastic element 111 Sealing cover 50 wear-resistant parts 12 Second outer shell 200 rotor 121 Install inner wall 300 stator 20 motor shaft

[0036] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0039] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0040] In the motor system, the motor shaft of the suspension motor can only be assembled from one side. During assembly, the bearing needs to be installed in the housing first, and then the bearing is positioned using a snap ring. Then the motor shaft and rotor are pressed into the housing. In order to avoid damaging the bearing during the pressing process, an installation port needs to be opened on the housing. The installation port is first opened with a plug so that a tool can be inserted into the housing from the installation port and press against the inner ring of the bearing before the pressing process is carried out. Finally, the installation port needs to be closed with a plug and the plug is sealed with an O-ring, resulting in a large number of assembly parts for the motor.

[0041] Based on the above problems, this invention proposes a transmission structure 100 to solve the problem of a large number of parts during assembly. This transmission structure 100 is applied to a motor 1000, which also includes a rotor 200 and a stator 300. During assembly, the motor shaft 20 is first pressed into the rotor 200, and then the bearing 30 is fitted onto the first end 21 of the motor shaft 20, so that the motor shaft 20, the bearing 30, and the rotor 200 can initially form a single unit.

[0042] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the transmission structure 100 includes a housing 10, a motor shaft 20, and an elastic element 40; a sealing cover 111 is integrally formed on the inner sidewall of the housing 10; the motor shaft 20 has a first end 21 and a second end 22 opposite to each other, a bearing 30 is sleeved on the first end 21, the motor shaft 20 and the bearing 30 are integrally installed in the housing 10, and the first end 21 and the bearing 30 are inserted into the sealing cover 111; along the axial direction of the motor shaft 20, the elastic element 40 is disposed between the bearing 30 and the sealing cover 111.

[0043] Understandably, the sealing cover 111 is an integrally formed structure on the housing 10. The sealing cover 111 can be used directly to form a seal on the housing 10. That is, the side of the housing 10 closest to the bearing 30 is the sealing side, so that the oil flowing through the inside of the housing 10 will not leak outward.

[0044] In this embodiment, the transmission structure 100 can be applied to a hydraulic motor 1000. The motor shaft 20, bearing 30, rotor 200, stator 300, and other structures inside the housing 10 are immersed in oil. There is a gap between the rotor 200 and the housing, which allows oil to pass through and is designed to prevent interference between the rotor 200 and the housing 10 during rotation.

[0045] It should be noted that, since the positioning of bearing 30 is not achieved by using a snap ring, there will be a gap between bearing 30 and sealing cover 111 due to assembly errors when installing bearing 30. Therefore, an elastic element 40 is provided between bearing 30 and sealing cover 111. The elastic element 40 can effectively eliminate the gap between bearing 30 and sealing cover 111 to accurately position bearing 30.

[0046] In summary, when the technical solution of the present invention is applied to the motor 1000, during the assembly process, the motor shaft 20 is first pressed into the rotor 200; then the bearing 30 is fitted into the first end 21 of the motor shaft 20; then the motor shaft 20, rotor 200 and bearing 30 are assembled into the housing 10, and the first end 21 of the motor shaft 20 and the bearing 30 are inserted into the sealing cover 111, so that a seal is formed by the sealing cover 111 on the housing 10. Therefore, it is not necessary to open an installation port on the housing 10, nor is it necessary to use a plug to seal the installation port. The use of plugs, snap rings and O-rings is eliminated, thereby solving the problem of a large number of parts during the assembly process.

[0047] Furthermore, since the use of snap rings for positioning the bearing 30 is eliminated, this solution can eliminate the gap between the bearing 30 and the sealing cover 111 by placing the elastic element 40 between the bearing 30 and the sealing cover 111 along the axial direction of the motor shaft 20, thereby enabling precise positioning of the bearing 30.

[0048] In one embodiment, the outer periphery of the first end 21 of the motor shaft 20 is provided with a first shoulder and a second shoulder disposed opposite to each other. When the bearing 30 is sleeved on the first end 21 of the motor shaft 20, the bearing 30 is disposed between the first shoulder and the second shoulder, and the two sides of the inner ring of the bearing 30 abut against the first shoulder and the second shoulder respectively. In addition, the sealing cover 111 is provided with a shoulder, and the two ends of the elastic member 40 abut against the shoulder of the sealing cover 111 and the outer ring of the bearing 30 respectively, thereby effectively positioning the bearing 30 under the combined action of the first shoulder, the second shoulder, the shoulder, and the elastic member 40.

[0049] In practical applications, the elastic element 40 may be, but is not limited to, at least one structural component that can provide elastic force, such as wave spring, helical spring, spring sheet, silicone pad, rubber pad, etc., as long as it can effectively eliminate the gap between the bearing 30 and the sealing cover 111.

[0050] In practical applications, one end of the elastic element 40 can be connected to the sealing cover 111 by means of bonding, welding, or plugging to ensure the installation reliability of the elastic element 40.

[0051] It should be noted that when the bearing 30 is positioned using the elastic element 40, the elastic force of the elastic element 40 will act on the motor shaft 20 through the bearing 30, generating an axial thrust on the motor shaft 20 from the first end 21 toward the second end 22, which will cause wear between the motor shaft 20 and the housing 10.

[0052] Based on the above issues, please refer to Figure 1 , Figure 3 In one embodiment of the present invention, the transmission structure 100 may further include a wear-resistant member 50, which is disposed between the end face of the second end 22 and the housing 10 along the axial direction of the motor shaft 20.

[0053] With this configuration, after assembly, the elastic thrust of the elastic element 40 acts on the motor shaft 20 through the bearing 30, which will generate an axial thrust on the motor shaft 20 from the first end 21 toward the second end 22, so that the end face of the second end 22 of the motor shaft 20 abuts against the wear-resistant element 50. The wear-resistant element 50 is used to space between the motor shaft 20 and the housing 10, thereby reducing the wear between the motor shaft 20 and the housing 10.

[0054] In practical applications, the materials of wear-resistant parts 50 include, but are not limited to, high manganese steel series, wear-resistant chromium cast iron series, wear-resistant alloy steel series, ADI series, composite or gradient materials and hard alloy materials, non-metallic wear-resistant materials, etc.

[0055] Furthermore, the shape of the wear-resistant part 50 includes, but is not limited to, sheet-like, block-like, columnar, etc.

[0056] In practical applications, the wear-resistant part 50 can be connected to the end face of the second end 22 of the motor shaft 20 or to the housing 10, as long as it can serve to separate the motor shaft 20 from the housing 10.

[0057] Please see Figure 1 , Figure 3 In one embodiment of the present invention, the housing 10 has an inner mounting wall 121 opposite to the end face of the second end 22, and the wear-resistant member 50 is connected to the inner mounting wall 121.

[0058] With this configuration, since the end face size of the second end 22 of the motor shaft 20 is small, it would be inconvenient to operate if the wear-resistant part 50 were installed on the end face of the second end 22. Therefore, by directly connecting the wear-resistant part 50 to the mounting inner wall 121 of the housing 10, it is easier to install the wear-resistant part 50, and at the same time, the installation reliability of the wear-resistant part 50 can be guaranteed.

[0059] In practical applications, the wear-resistant part 50 can be integrally formed with the housing 10, or it can be connected to the mounting inner wall 121 of the housing 10 by means of bonding, screw connection, snap-fit, etc., as long as the installation of the wear-resistant part 50 can be achieved.

[0060] Please see Figure 1 , Figure 3 In one embodiment of the present invention, the wear-resistant part 50 and the housing 10 are integrally formed.

[0061] This design, by making the wear-resistant part 50 and the housing 10 an integral structure, not only improves the connection reliability between the wear-resistant part 50 and the housing 10, but also simplifies the manufacturing process and the subsequent assembly steps.

[0062] Please see Figure 1 , Figure 3 In one embodiment of the present invention, the wear-resistant part 50 is a gasket.

[0063] With this configuration, by using a shim as a wear-resistant part 50, the use of the shim can ensure an effective gap between the motor shaft 20 and the housing 10. Moreover, compared with block or other shaped wear-resistant parts 50, the use of the shim can also reduce the amount of material used, thereby reducing costs.

[0064] In practical applications, gaskets include, but are not limited to, annular gaskets, circular gaskets, and rectangular gaskets.

[0065] Please see Figure 1 In one embodiment of the present invention, the housing 10 includes a first outer shell 11 and a second outer shell 12 connected axially along the motor shaft 20. The inner sidewall of the first outer shell 11 is integrally formed with a sealing cover 111; the wear-resistant part 50 is disposed between the end face of the second end 22 and the second outer shell 12.

[0066] With this configuration, by designing the housing 10 as a first outer shell 11 and a second outer shell 12 connected axially along the motor shaft 20, the first outer shell 11 and the second outer shell 12 can be separated during assembly. This makes it easier to install the elastic element 40 onto the sealing cover 111 of the first outer shell 11, and also makes it easier to install the wear-resistant element 50 onto the second outer shell 12. It also makes it easier to install the motor shaft 20, rotor 200 and bearing 30 as a whole into the housing 10, thus making it easier to disassemble and assemble the motor 1000.

[0067] In practical applications, the first outer shell 11 and the second outer shell 12 can be detachably connected by means of screw connection, snap-fit, plug-in connection, etc., as long as the first outer shell 11 and the second outer shell 12 can be disassembled and assembled, and no specific limitation is made here.

[0068] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the elastic element 40 may be designed as a wave spring.

[0069] This configuration, using a wave spring as the elastic element 40, offers the following advantages: the wave spring can reduce the spring cavity, resulting in cost savings as the size of the wave spring decreases and less material is used in the manufacturing process; the load and spring rate of the wave spring are more accurate and predictable; the force of the wave spring increases at a uniform rate over most of its available deformation range; and the wave spring can provide higher reliability and better performance.

[0070] Please see Figures 1 to 3 The present invention also proposes a motor 1000, which includes a transmission structure 100, a rotor 200, and a stator 300. The specific structure of the transmission structure 100 is as described in the above embodiments. Since the motor 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The rotor 200 is disposed within the housing 10 of the transmission structure 100 and is located outside the motor shaft 20; the stator 300 is disposed within the housing 10 of the transmission structure 100 and is located outside the rotor 200.

[0071] Understandably, during the assembly process, the elastic element 40 can be installed into the sealing cover 111 of the housing 10 first, and the stator 300 can be installed into the housing 10; then the motor shaft 20 can be pressed into the rotor 200; then the bearing 30 can be fitted into the first end 21 of the motor shaft 20; then the motor shaft 20, rotor 200 and bearing 30 can be installed into the housing 10 as a whole, so that the first end 21 of the motor shaft 20 and the bearing 30 are inserted into the sealing cover 111, so that a seal is formed by the sealing cover 111 on the housing 10, and the outer ring of the bearing 30 abuts against the elastic element 40, so that the gap between the bearing 30 and the sealing cover 111 is eliminated by the elastic element 40, so that the bearing 30 can be accurately positioned. Therefore, it is not necessary to open an installation port on the housing 10, nor is it necessary to use a plug to seal the installation port, saving the use of plugs, snap rings and O-rings, thus solving the problem of a large number of parts during the assembly process.

[0072] Please see Figure 4 The present invention also proposes a method for assembling a motor 1000. This method is based on the motor 1000, and the specific structure of the motor 1000 is as described in the above embodiments. Since this method for assembling a motor 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0073] The assembly method of motor 1000 includes the following steps:

[0074] S10. Install the elastic element 40 into the sealing cover 111 of the housing 10; optionally, one end of the elastic element 40 can be connected to the sealing cover 111 by means of bonding, welding, plugging or other methods.

[0075] S20. Press the motor shaft 20 into the rotor 200. It should be noted that the motor shaft 20 is first pressed into the rotor 200 from the outside of the housing 10. Specifically, a press-fitting device can be used to press the motor shaft 20 into the rotor 200.

[0076] S30. The bearing 30 is fitted onto the first end 21 of the motor shaft 20. It should be noted that the bearing 30 is fitted onto the first end 21 of the motor shaft 20 outside the housing 10 so that the motor shaft 20, the bearing 30 and the rotor 200 form a whole.

[0077] S40. Press the motor shaft 20, rotor 200 and bearing 30 together into the housing 10 so that the first end 21 of the motor shaft 20 and the bearing 30 are inserted into the sealing cover 111 and the bearing 30 abuts against the elastic member 40. Optionally, a press-fitting device can be used to press the motor shaft 20, rotor 200 and bearing 30 together into the housing 10 to facilitate the assembly of the motor 1000.

[0078] Understandably, during the assembly process, the elastic element 40 can be installed into the sealing cover 111 of the housing 10 first; then the motor shaft 20 can be pressed into the rotor 200 outside the housing 10; then the bearing 30 can be fitted into the first end 21 of the motor shaft 20; then the motor shaft 20, rotor 200 and bearing 30 can be installed into the housing 10 as a whole, and the first end 21 of the motor shaft 20 and the bearing 30 can be inserted into the sealing cover 111 to form a seal through the sealing cover 111 on the housing 10, and the outer ring of the bearing 30 can abut against the elastic element 40 to eliminate the gap between the bearing 30 and the sealing cover 111 through the elastic element 40, so as to accurately position the bearing 30. Therefore, it is not necessary to open an installation port on the housing 10, nor is it necessary to use a plug to seal the installation port, saving the use of plugs, snap rings and O-rings, thus solving the problem of a large number of parts during the assembly process.

[0079] In one embodiment of the present invention, prior to the step of "pressing the motor shaft 20, rotor 200, and bearing 30 together into the housing 10", the method further includes:

[0080] Install the wear-resistant part 50 into the housing 10;

[0081] Install the stator 300 into the housing 10.

[0082] With this configuration, before pressing the motor shaft 20, rotor 200, and bearing 30 together into the housing 10, the wear-resistant component 50 and stator 300 are first installed into the housing 10. This allows the rotor 200 to be pressed into the stator 300 when the motor shaft 20, rotor 200, and bearing 30 together are pressed into the housing 10, so that the stator 300 is located outside the rotor 200. Simultaneously, the wear-resistant component 50 is positioned between the end face of the second end 22 of the motor shaft 20 and the housing 10. The elastic thrust of the elastic component 40, acting through the bearing 30, is applied to the motor shaft 20, generating an axial thrust from the first end 21 towards the second end 22, causing the end face of the second end 22 of the motor shaft 20 to abut against the wear-resistant component 50. The wear-resistant component 50 serves as a spacer between the motor shaft 20 and the housing 10, thereby reducing the likelihood of wear between the motor shaft 20 and the housing 10.

[0083] It should be noted that the installation steps of wear-resistant part 50 and stator 300 are not sequential. Wear-resistant part 50 can be installed into housing 10 first, stator 300 can be installed into housing 10 first, or wear-resistant part 50 and stator 300 can be installed into housing 10 at the same time.

[0084] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A transmission structure, characterized in that, include: The housing has an integrally formed sealing cover on its inner sidewall; The motor shaft has a first end and a second end opposite to each other. A bearing is sleeved on the first end. The motor shaft and the bearing are integrally installed into the housing, and the first end and the bearing are inserted into the sealing cover. An elastic element is disposed between the bearing and the sealing cover in the axial direction along the motor shaft.

2. The transmission structure as described in claim 1, characterized in that, The transmission structure also includes a wear-resistant component, which is disposed between the end face of the second end and the housing along the axial direction of the motor shaft.

3. The transmission structure as described in claim 2, characterized in that, The housing has an inner mounting wall opposite to the end face of the second end, and the wear-resistant component is connected to the inner mounting wall.

4. The transmission structure as described in claim 3, characterized in that, The wear-resistant component and the housing are integrally formed.

5. The transmission structure as described in claim 2, characterized in that, The wear-resistant part is a gasket.

6. The transmission structure as described in claim 2, characterized in that, The housing includes a first outer shell and a second outer shell connected axially along the motor shaft, and the sealing cover is integrally formed on the inner sidewall of the first outer shell; The wear-resistant component is disposed between the end face of the second end and the second outer shell.

7. The transmission structure as described in any one of claims 1 to 6, characterized in that, The elastic element is a wave spring.

8. An electric motor, characterized in that, include: The transmission structure as described in any one of claims 1 to 7; The rotor is disposed within the housing and located outside the motor shaft; The stator is disposed within the housing and located outside the rotor.

9. An assembly method based on the motor as described in claim 8, characterized in that, Includes the following steps: Install the elastic element into the sealing cover of the housing; Press the motor shaft into the rotor; The bearing is fitted onto the first end of the motor shaft; The motor shaft, the rotor, and the bearing are pressed into the housing so that the first end of the motor shaft and the bearing are inserted into the sealing cover and the bearing abuts against the elastic element.

10. The method for assembling a motor as described in claim 9, characterized in that, Before the step of "pressing the motor shaft, the rotor, and the bearing together into the housing", the method further includes: Install the wear-resistant parts into the housing; The stator is installed into the housing.

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