Water pumps and vehicles

Abstract

The present invention provides a water pump and a vehicle, the water pump includes a motor, the motor includes: a rotor; a bearing, arranged at intervals with the rotor; a rotating shaft, arranged on the rotor and supported by the bearing; an end cover, one of the end cover and the rotor is provided with a supporting protrusion, and the axial spacing distance M between the other of the end cover and the rotor and the supporting protrusion is less than the axial spacing distance N between the bearing and the rotor. The motor provided by this scheme can support the rotor while meeting the pressure protection of the bearing, and the assembly operation of the press-fit impeller can be achieved without disassembling the motor, the process is simpler, the assembly efficiency is higher, and the performance hidden dangers caused by the secondary assembly of the motor are avoided. At the same time, it can also prevent the rotor from pressing against the bearing during axial movement, avoid direct friction between the rotor and the end face of the bearing, and have a good anti-wear effect on the bearing.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a water pump and a vehicle. Background Art

[0002] For the current automotive electronic water pump OEMs, when assembling the impeller and the motor, due to the material characteristics of the bearing sleeve, the bearing part cannot be used as the pressure support surface when pressing the impeller. In order to avoid the problem of bearing necrosis caused by pressing the impeller, the existing technology improves the assembly process of the impeller and the motor. Specifically, 1. First disassemble the front and rear end covers of the motor, 2. Use the tooling table as the bottom support surface of the rotor, and then press the impeller through the press, 3. After the impeller is pressed, reinstall the front and rear end covers of the motor. This solution requires secondary assembly of the motor, which not only has a complicated assembly process, but also has a negative impact on the overall reliability of the motor and causes unnecessary performance risks. Summary of the invention

[0003] In order to solve at least one of the above technical problems, an object of the present invention is to provide a motor.

[0004] Another object of the present invention is to provide a water pump having the above motor.

[0005] Another object of the present invention is to provide a vehicle having the above-mentioned water pump.

[0006] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention provides a motor, comprising: a rotor; a bearing, spaced apart from the rotor; a rotating shaft, provided on the rotor and supported by the bearing; an end cover, wherein a supporting protrusion is provided on one of the end cover and the rotor, and an axial spacing distance M between the other of the end cover and the rotor and the supporting protrusion is smaller than an axial spacing distance N between the bearing and the rotor.

[0007] It is worth noting that the axial direction can be understood as the axial direction of the rotating shaft or the direction parallel to the axis of the rotating shaft.

[0008] The motor provided by the above embodiment of the present invention is provided with a supporting protrusion so that the end cover is closer to the rotor in the axial direction than the bearing. In this way, when the impeller is press-fitted, a direct abutting support can be formed between the rotor and the end cover inside the motor through the supporting protrusion, so that the end cover is used to provide a bottom supporting surface for the rotor to meet the support requirements for the rotor, that is, a self-supporting structure for the rotor is formed inside the motor. In this design, while the rotor and the end cover are supported by the supporting protrusion, the supporting protrusion can be used to form a gap between the bearing and the rotor, which has an anti-pressure protection effect on the bearing and can avoid the problem of compression necrosis of the bearing. Generally speaking, the purpose of supporting the rotor and protecting the bearing against pressure is achieved. In this way, by using this motor, the assembly operation of the press-fit impeller can be achieved without disassembling the motor, the process is simpler, the assembly efficiency is higher, and accordingly, the secondary assembly of the motor is avoided, and the performance hidden dangers caused by the secondary assembly are avoided accordingly, and the product reliability is higher. In addition, it can be understood that the support protrusion can also be used to limit the rotor in the axial direction during the daily use of the product to prevent the rotor from pressing against the bearing during axial movement, avoid direct friction between the rotor and the bearing, have a good anti-wear effect on the bearing, and the product life is longer and the reliability is higher.

[0009] In addition, the motor in the above embodiment provided by the present invention may also have the following additional technical features:

[0010] In the above technical solution, the value of M is less than or equal to 3 mm.

[0011] In the present solution, the value of M is set to be less than or equal to 3 mm. In this way, it can be ensured that when the impeller is pressed, the supporting protrusion and the other of the aforementioned middle end cover and the rotor can achieve direct abutment fit through the axial movement of the rotor, and the axial movement of the rotor will not be too large when the abutment fit is formed, thereby ensuring that the rotor in the motor is stable and reliable. At the same time, it is also beneficial to save the internal space of the product and make the product components more compact.

[0012] In the above technical solution, the value of M is greater than or equal to 1 mm.

[0013] In this solution, the value of M is set to be greater than or equal to 1 mm. This ensures that during daily use of the product, an effective anti-wear gap can be formed between the supporting protrusion on the end cover and the rotor or between the supporting protrusion of the rotor and the end cover to avoid direct friction, increase the friction life of the product shaft during axial movement, and enhance the reliability of the motor.

[0014] In any of the above technical solutions, N and M satisfy: 1mm≤NM≤3mm.

[0015] In the present solution, N and M are set to satisfy 1mm≤NM≤3mm, that is, the protruding height of the end face of the supporting protrusion relative to the bearing is approximately 1mm~3mm. In this way, when the supporting protrusion stops at the other one of the end cover and the rotor, that is, when the terminal and the rotor are directly supported by the supporting protrusion, a gap of at least 1mm~3mm can be maintained between the bearing and the rotor, which has a good air avoidance effect on the bearing, can help improve the anti-wear and anti-pressure effects of the bearing, and at the same time ensure that the bearing supports the rotor stably.

[0016] In any of the above technical solutions, the end cover includes a cover body and a bearing chamber arranged on the cover body, the bearing is arranged in the bearing chamber, and the bearing chamber is provided with the supporting protrusion protruding toward the location of the rotor.

[0017] In this solution, the end cover is provided with a bearing chamber for installing the bearing, and the bearing chamber is provided with a supporting protrusion protruding toward the rotor. In this way, the supporting protrusion on the end cover is located closer to the bearing on the end cover, which has a better air-avoiding support effect on the bearing, and can help improve the wear and pressure resistance of the bearing.

[0018] In the above technical solution, the bearing is integrally injection-moldedly connected to the bearing chamber, or the bearing is interference-fitted to the bearing chamber; and / or the outer surface of the bearing is provided with a convex portion or a concave portion; and / or the bearing chamber is a cavity with an opening at one end, wherein the opening of the bearing chamber faces the rotor, or the opening of the bearing chamber faces away from the rotor.

[0019] In this solution, the bearing and the bearing chamber are integrally injection molded to save assembly steps for the product and to ensure reliable and stable assembly of the bearing and the end cover. Of course, this is only a preferred technical solution, and an interference fit structure can also be used to assemble the bearing and the end cover as needed.

[0020] The outer surface of the bearing is provided with convex or concave portions, which is conducive to achieving stable and reliable assembly between the bearing and the bearing chamber. For example, in the case where the bearing and the bearing chamber are integrally injection-molded, the concave or convex portions on the outer surface of the bearing can form a bite fit in the connection structure formed by injection molding, which can enhance the bonding force between the bearing and the bearing chamber and help prevent the bearing from rotating in the bearing chamber. The assembly reliability is higher and the bearing limiting effect is also better. In the case of interference assembly of the bearing and the bearing chamber, the convex and concave portions on the outer surface of the bearing can enhance its deformation ability and rebound ability in interference assembly, which is more conducive to ensuring the firmness of the interference assembly, and the interference assembly operation will also be easier and more convenient.

[0021] In any of the above technical solutions, the bearings are respectively provided on both sides of the rotor's axial direction, and there are two end covers, namely a front end cover and a rear end cover, wherein the supporting protrusions are respectively provided between the rotor and the front end cover and between the rotor and the rear end cover.

[0022] In the present scheme, bearings are respectively provided on both sides of the rotor axial direction, and the bearings corresponding to the two sides of the rotor axial direction are respectively provided with front end covers and rear end covers. Specifically, a front end cover is provided for the bearing corresponding to the front side of the rotor axial direction, and a rear end cover is provided for the bearing corresponding to the rear side of the rotor axial direction. Among them, a supporting protrusion is provided on one of the front end cover and the rotor, and the axial spacing distance between the other of the front end cover and the rotor and the supporting protrusion is smaller than the axial spacing distance between the rotor and the bearing on its front side. A supporting protrusion is provided on one of the rear end cover and the rotor, and the axial spacing distance between the other of the rear end cover and the rotor and the supporting protrusion is smaller than the axial spacing distance between the rotor and the bearing on its rear side. In this way, it can ensure that the rear end cover effectively supports the rotor when the impeller is pressed and the bearing is protected from pressure. In addition, during the daily operation of the product, the rotor can be stopped and limited, especially the forward movement of the rotating shaft caused by the negative pressure on the front side of the impeller can be stopped and limited, so as to prevent the bearing from wear, extend the product life, and improve the product reliability.

[0023] In any of the above technical solutions, the rotor includes: a rotor body; and a sealing layer, wherein the outer surface of the rotor body is covered with the sealing layer.

[0024] In this solution, a sealing layer is provided on the outer surface of the rotor body to achieve the waterproof function of the rotor.

[0025] In the above technical solution, in the case where the end cover is provided with the supporting protrusion, the wall thickness of the sealing layer provided on the end surface of the rotor body corresponding to the supporting protrusion of the end cover is 1 mm to 3 mm.

[0026] In this solution, the wall thickness of the sealing layer on the end face of the rotor body at the supporting protrusion corresponding to the end cover is set to 1mm to 3mm, which can ensure the wear resistance of the sealing layer and avoid the failure of the waterproof performance caused by damage to the sealing layer. At the same time, the sealing layer will not be too thick to cause the problem of excessive rotor volume.

[0027] In the above technical solution, the outer surface of the rotor body includes a front end face, a rear end face and a peripheral side face, the front end face and the rear end face are located at two ends of the axial direction of the peripheral side face, and the front end face is opposite to the front end cover, and the rear end face is opposite to the rear end cover, wherein the wall thickness of the sealing layer on the front end face is greater than the wall thickness of the sealing layer on the rear end face, and the wall thickness of the sealing layer on the rear end face is greater than or equal to the wall thickness of the sealing layer on the peripheral side face; and / or the wall thickness of the sealing layer on the peripheral side face is 0.5mm~1mm; and / or the wall thickness of the sealing layer on the front end face is 3mm; and / or the wall thickness of the sealing layer on the rear end face is 1mm.

[0028] In the present scheme, the wall thickness of the sealing layer on the front end face is set to be greater than the wall thickness of the sealing layer on the rear end face. Under the premise that the overall axial thickness of the rotor is not too large, the wear resistance of the sealing layer on the front end face of the rotor body can be further enhanced. For the forward movement of the rotating shaft caused by the rotation of the impeller on the front side of the rotor, the surface of the sealing layer on the front end face of the rotor body and the support protrusion on the front end cover can be stopped and limited to prevent the bearing from being compressed. At the same time, the sealing layer on the front end face of the rotor body has sufficient wear resistance so that it will not be worn by the support protrusion on the front end cover when it abuts against the support protrusion on the front end cover, thereby ensuring product reliability. As for the sealing layer on the circumferential side and rear end faces of the rotor body, since they are subjected to less direct friction, their wall thickness is relatively thin, which can help to simplify the overall size of the rotor.

[0029] The wall thickness of the sealing layer on the circumferential side surface is set to 0.5 mm to 1 mm. While the waterproof function of the rotor is reliable, the radial dimension of the rotor is not too large, which is conducive to the clearance assembly of the rotor to ensure its smooth rotation.

[0030] The wall thickness of the sealing layer on the front end face is set to 3mm, which can ensure the wear resistance of the sealing layer on the front end face and avoid the failure of the waterproof performance caused by damage to the sealing layer on the front end face. At the same time, the sealing layer on the front end face will not be too thick to cause the problem of excessive rotor volume.

[0031] Setting the wall thickness of the sealing layer on the rear end face to 1 mm can ensure the wear resistance of the sealing layer on the rear end face and avoid the failure of the waterproof performance caused by damage to the sealing layer on the rear end face. At the same time, the sealing layer on the rear end face will not be too thick to cause the problem of excessive rotor volume.

[0032] In the above technical solution, the motor also has a stator assembly, wherein the front end cover is integrally injection-molded with the stator assembly; or the front end cover is provided with an inner cavity, an isolation sleeve is provided in the inner cavity, the rotor is located in the inner cavity and nested on the inner side of the isolation sleeve, and the stator assembly is assembled in the inner cavity and nested on the outer side of the isolation sleeve.

[0033] In the present solution, the front end cover is provided to be integrally connected to the stator assembly by injection molding. Specifically, for example, the front end cover is designed to be an injection-molded part integrally connected to the stator assembly, or the metal front end cover is designed to be integrally connected to the stator assembly by an injection-molded body formed by injection molding, etc. This can further reduce the number of product parts, save assembly steps, and improve product assembly efficiency. Of course, the present solution is not limited to this. It can be understood that the front end cover and the stator assembly do not necessarily have to be injection-molded. Technicians in this field can also arrange the stator assembly in the inner cavity of the front end cover in an assembled form according to needs. Specifically, for example, assembly methods such as interference fitting or connector fixation are used to achieve assembly in the inner cavity of the front end cover. At the same time, an isolation sleeve is provided to utilize the isolation sleeve to separate the stator assembly and the rotor radially inside and outside to ensure that the stator assembly is sealed, which can also meet the assembly and sealing requirements of the stator assembly.

[0034] An embodiment of the second aspect of the present invention provides a water pump, comprising: an impeller; and the motor described in any of the above technical solutions, wherein the rotating shaft is connected to the impeller and can drive the impeller to rotate.

[0035] The water pump provided in the above embodiment of the present invention has all the above beneficial effects by being provided with the motor described in any of the above technical solutions, which will not be described in detail here.

[0036] Preferably, the water pump is an automotive electronic water pump.

[0037] An embodiment of the third aspect of the present invention provides a vehicle, comprising the water pump described in any of the above technical solutions.

[0038] The vehicle provided by the above embodiment of the present invention has all the above beneficial effects by being provided with the water pump described in any of the above technical solutions, which will not be described in detail here.

[0039] More specifically, the vehicle includes a cooling water circulation system, and the water pump is disposed in the cooling water circulation system to drive the cooling water to flow.

[0040] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0042] Figure 1 is a schematic structural diagram of a water pump according to an embodiment of the present invention;

[0043] Figure 2 yes Figure 1 A schematic cross-sectional view of the water pump shown in FIG.

[0044] Figure 3 yes Figure 2 The enlarged structural diagram of the A part is shown in FIG.

[0045] Figure 4 yes Figure 2 The enlarged structural diagram of part B is shown in FIG.

[0046] Figure 5 is a schematic cross-sectional structural diagram of a water pump according to an embodiment of the present invention;

[0047] Figure 6 yes Figure 5 The enlarged structural diagram of the C portion shown in FIG.

[0048] Figure 7 is a schematic structural diagram of a water pump according to an embodiment of the present invention;

[0049] Figure 8 yes Figure 7 A schematic cross-sectional view of the water pump shown in FIG.

[0050] Fig. 9 yes Figure 7 The structural schematic diagram of the front end cover shown in;

[0051] Fig.10 yes Figure 7 The structural schematic diagram of the rear end cover shown in;

[0052] Fig.11 It is a schematic diagram of the three-dimensional structure of a bearing of a water pump according to an embodiment of the present invention;

[0053] Fig.12 It is a schematic diagram of the three-dimensional structure of a bearing of a water pump according to an embodiment of the present invention.

[0054] in, Figures 1 to 12 The corresponding relationship between the reference numerals and component names in the figure is:

[0055] 110 rotor, 111 rotor body, 1111 front end face, 1112 rear end face, 1113 circumferential side face, 112 sealing layer, 120 bearing, 121 convex portion, 122 concave portion, 130 rotating shaft, 140 end cover, 141 front end cover, 1411 cover body, 1412 bearing chamber, 142 rear end cover, 150 supporting convex portion, 160 stator assembly, 170 isolation sleeve, 181 first sealing ring, 182 second sealing ring, 183 third sealing ring, 200 impeller. DETAILED DESCRIPTION

[0056] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0057] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0058] Refer to the following Figures 1 to 12 The water pump and the motor thereof according to some embodiments of the present invention are described.

[0059] like Figures 1 to 10 As shown, the motor provided by the embodiment of the first aspect of the present invention includes: a rotor 110 , a bearing 120 , a rotating shaft 130 and an end cover 140 .

[0060] Specifically, the bearing 120 is spaced apart from the rotor 110; the rotating shaft 130 is disposed on the rotor 110 and supported by the bearing 120; a supporting protrusion 150 is provided on one of the end cover 140 and the rotor 110, and an axial spacing distance M between the other of the end cover 140 and the rotor 110 and the supporting protrusion 150 is smaller than an axial spacing distance N between the bearing 120 and the rotor 110.

[0061] The motor provided by the above embodiment of the present invention is provided with a support protrusion 150, so that the end cover 140 is closer to the rotor 110 in the axial direction than the bearing 120. In this way, when the impeller 200 is press-fitted, inside the motor, the rotor 110 and the end cover 140 can form a direct abutment support through the support protrusion 150, so that the end cover 140 can provide a bottom support surface for the rotor 110 to meet the support demand for the rotor 110, that is, a self-supporting structure for the rotor 110 is formed inside the motor. In this design, while the rotor 110 and the end cover 140 form an abutment support through the support protrusion 150, the support protrusion 150 can form a gap between the bearing 120 and the rotor 110, which has an anti-pressure protection effect on the bearing 120 and can avoid the problem of compression necrosis of the bearing 120. Generally speaking, the purpose of supporting the rotor 110 and protecting the bearing 120 against pressure is achieved. In this way, using this motor, the impeller can be directly assembled to its rotating shaft on the outside without disassembling the motor and using a work platform to provide additional support for the rotor inside. The assembly process of the press-fit impeller 200 is simpler and the assembly efficiency is higher. Accordingly, the secondary assembly of the motor is avoided, and the performance risks caused by the secondary assembly are avoided accordingly, and the product reliability is higher. In addition, it can be understood that the support protrusion 150 can also be used to perform axial stop and limit on the rotor 110 during daily use of the product to prevent the rotor 110 from pressing against the bearing 120 during axial movement, thereby avoiding direct friction between the rotor 110 and the bearing 120, having a good anti-wear effect on the bearing 120, and a longer product life and higher reliability.

[0062] In detail, for example, a supporting protrusion 150 is provided on the end cover 140, the end cover 140 is located at one end of the rotor 110 and is rotatably connected to the rotating shaft 130 through the bearing 120, wherein the supporting protrusion 150 on the end cover 140 protrudes toward the rotor 110, and the axial spacing distance M between the supporting protrusion 150 on the end cover 140 and the rotor 110 is smaller than the axial spacing distance N between the bearing 120 and the rotor 110; or, a supporting protrusion is provided on the rotor, the end cover is located at one end of the rotor and is rotatably connected to the rotating shaft through the bearing, wherein the supporting protrusion on the rotor protrudes toward the end cover, and the axial spacing distance M between the supporting protrusion on the rotor and the end cover is smaller than the axial spacing distance N between the bearing and the rotor.

[0063] Optionally, there are two end covers, namely a front end cover and a rear end cover, wherein:

[0064] When the impeller is press-fitted at the front end of the rotating shaft, the rear end cover is used to provide a bottom support surface to meet the support requirements of the rotor. The rear end cover can be understood as the end cover in the aforementioned detailed content (it is worth noting that the end cover in the aforementioned detailed content should be understood in accordance with the two situations introduced in the aforementioned detailed content. One is an end cover with a support protrusion, and the other is an end cover used to cooperate with the support protrusion of the rotor based on the situation that the rotor is provided with a support protrusion. Among them, when understanding the end cover in the aforementioned detailed content from the perspective of the second one, the entire technical solution should be interpreted in conjunction with the content of "the rotor is provided with a support protrusion") to meet the pressure The purpose is to provide support to the rotor and protect the bearing during the installation of the impeller. As for the front end cover, in order to limit the forward movement of the rotor to protect the bearing against pressure, the front end cover can also be designed to have the same structure as the end cover defined in the aforementioned details, so as to solve the problem of direct friction between the rotor and the bearing end face during the operation of the motor. In addition, it can be understood that the design of the front end cover is a preferred technical solution. In addition to this, technical personnel in this field can also choose to design the front end cover as a traditional cover structure (that is, an end cover structure that does not have the aforementioned support protrusion or is not used to cooperate with the support protrusion stop of the rotor) according to specific needs.

[0065] Of course, it is not ruled out that impellers are pressed onto the front and rear ends of the shaft respectively. In this case, when the impeller at the front end of the shaft is pressed onto, the rear end cover is used to provide a bottom support surface to meet the support requirements for the rotor, and when the impeller at the rear end of the shaft is pressed onto, the front end cover is used to provide a bottom support surface to meet the support requirements for the rotor. Therefore, both the front and rear end covers can be designed to meet the structure of the end covers in the aforementioned detailed content, respectively meeting the purpose of providing support to the rotor and protecting the bearings during the process of pressing the front and rear impellers, and can solve the problem of direct friction between the rotor and the bearing end faces during the operation of the motor.

[0066] Specific embodiment 1 (such as Figure 1 , Figure 2 , Figure 3 and Figure 4 (shown)

[0067] The motor includes: a rotor 110, a bearing 120, a rotating shaft 130, a front cover 141, a rear cover 142, a stator assembly 160, an isolation sleeve 170, a first sealing ring 181, a second sealing ring 182, a third sealing ring 183, etc.

[0068] Specifically, the rotor 110 is preferably a permanent magnet rotor, and the rotor 110 includes a rotor body 111 and a sealing layer 112. The sealing layer 112 can be a plastic layer formed on the outer surface of the rotor body 111 by injection molding and sealing. The rotating shaft 130 is arranged on the rotor 110 and supported by the bearing 120, and is used to connect with the impeller 200 and drive the impeller 200 to rotate; the front end cover 141 is provided with an inner cavity, and the inner cavity is provided with an isolation sleeve 170. The rotor 110 is located in the inner cavity and is nested and distributed on the inner side of the isolation sleeve 170. The stator assembly 160 is interference fit. It is assembled in the inner cavity and nested on the outside of the isolation sleeve 170, so as to separate the stator assembly 160 from the inside and outside of the rotor 110 through the isolation sleeve 170 to ensure that the stator assembly 160 is sealed and waterproof, wherein the isolation sleeve 170 is connected to the front end cover 141 and the rear end cover 142, and the isolation sleeve 170 is sealed with the front end cover 141 by a first sealing ring 181, and is sealed with the rear end cover 142 by a second sealing ring 182, and the front end cover 141 and the rear end cover 142 are sealed at the joint by a third sealing ring 183.

[0069] like Figure 3 As shown, the front end cover 141 is preferably a metal casting, and a bearing chamber 1412 with an opening at one end is provided on the cover body 1411 of the front end cover 141. The opening of the bearing chamber 1412 of the front end cover 141 faces away from the rotor 110, that is, the opening of the bearing chamber 1412 on the front end cover 141 faces forward, and the bearing 120 for supporting the rotating shaft 130 mentioned above is provided in the bearing chamber 1412 of the front end cover 141. The portion of the bearing chamber 1412 corresponding to the rotor 110 (the rear end portion of the bearing chamber 1412) is a stop. The retaining wall separates the rear end surface of the bearing 120 from the rotor 110, and the front end cover 141 uses the retaining wall as a supporting protrusion 150. In this way, the supporting protrusion 150 on the front end cover 141 is axially closer to the rotor 110 relative to the bearing 120 on the front end cover 141. It can also be said that the axial spacing distance M11 between the supporting protrusion 150 on the front end cover 141 and the rotor 110 is smaller than the axial spacing distance N11 between the bearing 120 on the front end cover 141 and the rotor 110.

[0070] The rear end cover 142 is preferably a metal casting, and a bearing chamber is provided on the cover body of the rear end cover 142. The bearing chamber of the rear end cover 142 is provided with the bearing 120 for supporting the rotating shaft 130 as mentioned above, wherein the bearing chamber of the rear end cover 142 is provided with a supporting protrusion 150 protruding toward the direction (front) of the rotor 110, and the supporting protrusion 150 on the bearing chamber of the rear end cover 142 protrudes forward from the front end surface of the bearing 120 on the rear end cover 142, so that the supporting protrusion 150 on the rear end cover 142 is axially closer to the rotor 110 relative to the bearing 120 on the rear end cover 142. It can also be said that the axial spacing distance M12 between the supporting protrusion 150 on the rear end cover 142 and the rotor 110 is smaller than the axial spacing distance N12 between the bearing 120 on the rear end cover 142 and the rotor 110.

[0071] Preferably, the bearing 120 is integrally connected to the bearing chamber 1412 on the front end cover 141 by injection molding, which can simplify the number of product components and save assembly steps, and / or the bearing 120 is integrally connected to the bearing chamber 1412 on the rear end cover 142 by injection molding, which can simplify the number of product components and save assembly steps.

[0072] More preferably, if Fig.11 As shown, the bearing 120 is provided with a convex portion 121, or, as shown Fig.12 As shown, a recess 122 is provided on the bearing 120. When the bearing 120 is integrally connected with the bearing chamber on the front cover 141 or the rear cover 142 by injection molding, the convex portion 121 or the recess 122 can form a bite fit between the bearing 120 and the bearing chamber, which can enhance the bonding force between the bearing 120 and the bearing chamber and help prevent the bearing 120 from rotating in the bearing chamber, making the assembly more stable and reliable.

[0073] Specific embodiment 2 (such as Figure 5 and Figure 6 (shown)

[0074] The difference from the aforementioned specific embodiment 1 is that a bearing chamber 1412 with an opening at one end is provided on the cover body 1411 of the front end cover 141, and the opening of the bearing chamber 1412 of the front end cover 141 faces the rotor 110, that is, the opening of the bearing chamber 1412 of the front end cover 141 faces the rear, and the bearing chamber 1412 of the front end cover 141 is provided with a supporting protrusion 150 protruding toward the direction of the rotor 110 (backward) at a portion around the opening thereof, and the bearing chamber 1412 of the front end cover 141 is provided with the aforementioned support for supporting the rotating shaft 130 The support protrusion 150 on the bearing chamber 1412 of the front end cover 141 protrudes backward beyond the rear end surface of the bearing 120 of the front end cover 141, so that the support protrusion 150 on the front end cover 141 is axially closer to the rotor 110 relative to the bearing 120 on the front end cover 141. It can also be said that the axial spacing distance M21 between the support protrusion 150 on the front end cover 141 and the rotor 110 is smaller than the axial spacing distance N22 between the bearing 120 on the front end cover 141 and the rotor 110.

[0075] Specific embodiment three (such as Figure 7 , Figure 8 , Fig. 9 and Fig.10 )

[0076] The difference from the aforementioned specific embodiment 1 is that the isolation sleeve 170 and the first sealing ring 181 are eliminated in the present structure, and the front end cover 141 is integrally connected to the stator assembly 160 by injection molding. Preferably, an isolation wall is formed on the front end cover 141 to radially separate the stator assembly 160 and the rotor 110, so as to play an isolation role similar to that of the isolation sleeve 170. At the same time, due to the injection molding connection, the purpose of reducing the number of components and saving assembly steps is achieved.

[0077] More specifically, if Figure 8 and Fig. 9As shown, the front end cover 141 is designed to be an injection molded part that is integrally connected to the stator assembly 160 by injection molding, wherein a bearing chamber 1412 integrally formed with the stator assembly 160 is constructed on the cover body 1411 of the front end cover 141 by injection molding, and the bearing chamber 1412 on the cover body 1411 of the front end cover 141 is a structure with an opening at one end, and the opening of the bearing chamber 1412 of the front end cover 141 faces away from the rotor 110, that is, the opening of the bearing chamber 1412 on the front end cover 141 faces forward, and the bearing 120 for supporting the rotating shaft 130 mentioned above is arranged in the bearing chamber 1412 of the front end cover 141. The portion 12 corresponding to the rotor 110 (the rear end portion of the bearing chamber 1412) is a retaining wall, which separates the rear end surface of the bearing 120 from the rotor 110, and the front end cover 141 uses the retaining wall as a supporting protrusion 150. In this way, the supporting protrusion 150 on the front end cover 141 is axially closer to the rotor 110 relative to the bearing 120 on the front end cover 141. It can also be said that the axial spacing distance M31 between the supporting protrusion 150 on the front end cover 141 and the rotor 110 is smaller than the axial spacing distance N31 between the bearing 120 on the front end cover 141 and the rotor 110.

[0078] The rear end cover 142 is a separate part, preferably a metal casting, and is connected to the front end cover 141 by assembly, wherein the rear end cover 142 and the front end cover 141 are sealed at the partition wall by a second sealing ring 182, and the rear end cover 142 and the front end cover 141 are sealed at the joint by a third sealing ring 183, and a bearing chamber is provided on the cover body of the rear end cover 142, and the bearing chamber of the rear end cover 142 is provided with the bearing 120 for supporting the rotating shaft 130, wherein the bearing chamber of the rear end cover 142 is provided with a bearing 120 for supporting the rotating shaft 130 in the direction of the rotor 110 ( The support protrusion 150 protrudes forward of the rear cover 142, and the support protrusion 150 on the bearing chamber of the rear cover 142 protrudes forward beyond the front end surface of the bearing 120 on the rear cover 142, so that the support protrusion 150 on the rear cover 142 is axially closer to the rotor 110 relative to the bearing 120 on the rear cover 142. It can also be said that the axial spacing distance M32 between the support protrusion 150 on the rear cover 142 and the rotor 110 is smaller than the axial spacing distance N32 between the bearing 120 on the rear cover 142 and the rotor 110.

[0079] In a preferred embodiment of the invention, the value of M is less than or equal to 3 mm. More specifically, Figure 3 , Figure 4 , Figure 6 and Figure 8As shown, the values ​​of M11, M12, M21, M31, and M32 are all less than or equal to 3 mm. In this way, it can be ensured that when the impeller 200 is pressed, the supporting protrusion 150 and the other of the middle end cover 140 and the rotor 110 can be directly abutted by the axial movement of the rotor 110, and the axial movement of the rotor 110 is not too large when the abutment is formed, ensuring that the rotor 110 in the motor is stable and reliable, and at the same time, it is also beneficial to save the internal space of the product and make the product components more compact.

[0080] Further preferably, the value of M is greater than or equal to 1 mm, more specifically, Figure 3 , Figure 4 , Figure 6 and Figure 8 As shown, the values ​​of M11, M12, M21, M31, and M32 are all greater than or equal to 1 mm. This ensures that during daily use of the product, an effective anti-wear gap can be formed between the support protrusion 150 on the end cover 140 and the rotor 110, or between the support protrusion 150 of the rotor 110 and the end cover 140, thereby avoiding direct friction, increasing the friction life of the product shaft 130 during axial movement, and enhancing the reliability of the motor.

[0081] In a preferred embodiment of the invention, N and M satisfy: 1mm≤NM≤3mm, that is, the protruding height of the end face of the support protrusion 150 relative to the bearing 120 is approximately 1mm~3mm. In this way, when the support protrusion 150 stops at the other of the end cover 140 and the rotor 110, that is, when the terminal and the rotor 110 are directly supported by the support protrusion 150, a gap of at least 1mm~3mm can be maintained between the bearing 120 and the rotor 110, which has a good air avoidance effect on the bearing 120, can be beneficial to improving the wear and pressure resistance of the bearing 120, and at the same time ensures that the bearing 120 supports the rotor 110 stably.

[0082] More specifically, for example:

[0083] like Figure 3 As shown, 1mm≤N11-M11≤3mm is satisfied.

[0084] like Figure 4 As shown, 1mm≤N12-M12≤3mm is satisfied.

[0085] like Figure 6 As shown, 1mm≤N21-M21≤3mm is satisfied.

[0086] like Figure 8 As shown, 1mm≤N31-M31≤3mm and 1mm≤N32-M32≤3mm are satisfied.

[0087] In a preferred embodiment of the invention, Figure 3 , Figure 4 and Figure 6 As shown, the rotor 110 specifically includes a rotor body 111 and a sealing layer 112. The outer surface of the rotor body 111 is covered with the sealing layer 112 to achieve the waterproof function of the rotor 110. In the case where the end cover 140 is provided with a supporting protrusion 150, it is preferably designed that the wall thickness of the sealing layer 112 provided on the end surface of the rotor body 11 corresponding to the supporting protrusion 150 of the end cover 140 is 1mm to 3mm. More specifically, Figure 3 and Figure 6 As shown, the wall thickness h of the sealing layer 112 covered on the axial front end surface of the rotor body 111 is 1 mm to 3 mm. Figure 4 As shown, the wall thickness h of the sealing layer 112 covered on the axial rear end face of the rotor body 111 is 1 mm to 3 mm. As for the wall thickness of the sealing layer 112 covered on the circumferential side face of the rotor body 111, those skilled in the art can design it according to specific requirements. Considering the product space problem, it is generally preferred to design the wall thickness of the sealing layer 112 on the circumferential side face of the rotor body 111 to be smaller than the wall thickness of the sealing layer 112 on the axial end face (front end face or rear end face) of the rotor body 111.

[0088] More specifically, if Figure 2 As shown, the outer surface of the rotor body 111 includes a front end face 1111, a rear end face 1112 and a peripheral side face 1113, the front end face 1111 and the rear end face 1112 are located at two axial ends of the peripheral side face 1113, and the front end face 1111 is opposite to the front end cover 141, and the rear end face 1112 is opposite to the rear end cover 142, wherein the wall thickness of the sealing layer 112 on the front end face 1111 is greater than the wall thickness of the sealing layer 112 on the rear end face 1112, and the wall thickness of the sealing layer 112 on the rear end face 1112 is greater than or equal to the wall thickness of the sealing layer 112 on the peripheral side face 1113. In this way, under the premise that the overall axial thickness of the rotor 110 is not too large, the wear resistance of the sealing layer 112 on the front end face 1111 of the rotor body 111 can be further enhanced. For the forward movement of the rotating shaft 130 caused by the rotation of the impeller 200 on the front side of the rotor 110, the surface of the sealing layer 112 on the front end face 1111 of the rotor body 111 and the supporting protrusion 150 on the front end cover 141 can be stopped and limited to prevent the bearing 120 from being compressed. At the same time, the sealing layer 112 on the front end face 1111 of the rotor body 111 has sufficient wear resistance so as not to be worn by the supporting protrusion 150 on the front end cover 141 when it abuts against the supporting protrusion 150 on the front end cover 141, thereby ensuring product reliability. As for the sealing layer 112 on the circumferential side surface 1113 and the rear end face 1112 of the rotor body 111, since they are subjected to less direct friction, their wall thickness is relatively thin, which is conducive to simplifying the overall size of the rotor 110.

[0089] More specifically, for example, the wall thickness of the sealing layer 112 on the front end surface 1111 is designed to be 3 mm, and the wall thickness of the sealing layer 112 on the rear end surface 1112 is designed to be 1 mm.

[0090] Preferably, the wall thickness of the sealing layer on the peripheral side surface 1113 is 0.5 mm to 1 mm. While the waterproof function of the rotor 110 is reliable, the radial dimension of the rotor 110 is not too large, which is conducive to the clearance assembly of the rotor 110 to ensure its smooth rotation.

[0091] In a preferred embodiment of the invention, the motor further includes a drive control component, which is disposed in the rear end cover 142 .

[0092] In summary, in the existing overall assembly of a water pump including a motor, due to the material properties of the sliding bearing 120 set, it cannot be used as a pressure support surface when pressing the impeller 200. In order to avoid causing necrosis of the bearing 120 set, the current assembly process is: 1. Disassemble the front and rear end covers of the motor body; 2. Use the workbench as the bottom support surface of the rotor 110, and then press the impeller 200 through a press; 3. Finally, assemble the front and rear end covers of the motor for a second time; the assembly steps are complicated, and the secondary assembly will bring performance risks to the motor as a whole.

[0093] Through the motor structure in the aforementioned embodiment of the present invention, in the rear end cover 142 of the motor, the end face of the support protrusion 150 of the bearing chamber protrudes from the sliding bearing sleeve. When the whole machine is assembled, the end face of the support protrusion 150 on the bearing chamber of the rear end cover 142 can be used as a pressure support surface to support the rotor 110. In this way, the impeller 200 can be directly press-fitted from the outside without disassembling the motor, which simplifies the assembly steps and improves the assembly efficiency. At the same time, it also avoids the sliding bearing 120 being used as a pressure support surface during press-fitting, which may cause the bearing 120 to be necrotic.

[0094] When the impeller 200 is operating at a high speed, the negative pressure of the impeller 200 will attract the rotating shaft 130 to move forward. In this solution, since the supporting protrusion 150 on the front end cover 141 is closer to the rotor 110 than the bearing 120 on the front end cover 141, the rotor 110 will preferentially abut against the supporting protrusion 150 on the front end cover 141 to be stopped and limited, thereby avoiding direct friction between the rotor 110 and the bearing 120 on the front end cover 141, thereby increasing the friction life of the motor and enhancing the reliability of the motor.

[0095] For the case where the motor is not arranged horizontally, when the impeller 200 operates at a low speed, the negative pressure of the impeller 200 decreases, and the rotating shaft 130 will move backward due to the gravity of the rotor 110 itself. In this solution, since the supporting protrusion 150 on the rear end cover 142 is closer to the rotor 110 than the bearing 120 on the rear end cover 142, the rotor 110 will preferentially directly abut against the supporting protrusion 150 of the rear end cover 142 and be stopped and limited, thereby avoiding direct friction between the rotor 110 and the bearing 120 on the rear end cover 142, thereby increasing the friction life of the motor and enhancing the reliability of the motor.

[0096] like Figures 1 to 10 As shown, the water pump provided by the embodiment of the second aspect of the present invention includes: an impeller 200 and the motor described in any of the above embodiments, and the rotating shaft 130 of the motor is connected to the impeller 200 and can drive the impeller 200 to rotate.

[0097] The water pump provided in the above embodiment of the present invention has all the above beneficial effects by being provided with the motor described in any of the above technical solutions, which will not be described in detail here.

[0098] Preferably, the water pump is an automotive electronic water pump.

[0099] An embodiment of the third aspect of the present invention provides a vehicle, such as a car, comprising the water pump described in any one of the above embodiments.

[0100] The vehicle provided by the above embodiments of the present invention has all the above beneficial effects by being provided with the water pump described in any of the above embodiments, which will not be described in detail here.

[0101] More specifically, for example, the vehicle includes a cooling water circulation system, and the water pump is provided in the cooling water circulation system to drive the cooling water to flow.

[0102] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0103] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front" and "rear" etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0104] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water pump, characterized in that: include: A motor, comprising: Rotor; A bearing, spaced apart from the rotor; a rotating shaft, disposed on the rotor and supported by the bearing; An end cover, one of the end cover and the rotor is provided with a supporting protrusion, and an axial spacing distance M between the other of the end cover and the rotor and the supporting protrusion is smaller than an axial spacing distance N between the bearing and the rotor; The end cover comprises a rear end cover, and the rear end cover is provided with the supporting protrusion; An impeller, wherein the rotating shaft is connected to the impeller and can drive the impeller to rotate, and the impeller is installed by press-fitting. When the impeller is press-fitted, the supporting protrusion of the rear end cover directly supports the rotor; The bearing comprises a sliding bearing; The N and the M satisfy: 1mm≤NM≤3mm.

2. The water pump according to claim 1, characterized in that: The value of M is less than or equal to 3 mm.

3. The water pump according to claim 2, characterized in that: The value of M is greater than or equal to 1 mm.

4. The water pump according to any one of claims 1 to 3, characterized in that: The end cover comprises a cover body and a bearing chamber arranged on the cover body, the bearing is arranged in the bearing chamber, and the bearing chamber is provided with the supporting protrusion protruding toward the position where the rotor is located.

5. The water pump according to claim 4, characterized in that: The bearing is integrally connected to the bearing chamber by injection molding, or the bearing is interference fitted to the bearing chamber; and / or The outer surface of the bearing is provided with a convex portion or a concave portion; and / or The bearing chamber is a cavity with an opening at one end, wherein the opening of the bearing chamber faces the rotor, or the opening of the bearing chamber faces away from the rotor.

6. The water pump according to any one of claims 1 to 3, characterized in that: The bearings are respectively disposed on both sides of the rotor in an axial direction, and the end cover further comprises a front end cover, wherein the supporting protrusion is disposed between the rotor and the front end cover.

7. The water pump according to claim 6, characterized in that The rotor comprises: Rotor body; A sealing layer, wherein the outer surface of the rotor body is covered with the sealing layer.

8. The water pump according to claim 7, characterized in that: In the case where the end cover is provided with the supporting protrusion, the wall thickness of the sealing layer provided on the end surface of the rotor body corresponding to the supporting protrusion of the end cover is 1 mm to 3 mm.

9. The water pump according to claim 7, characterized in that: The outer surface of the rotor body includes a front end face, a rear end face and a peripheral side face, wherein the front end face and the rear end face are located at two ends of the peripheral side face in the axial direction, and the front end face is opposite to the front end cover, and the rear end face is opposite to the rear end cover, wherein: The wall thickness of the sealing layer on the front end surface is greater than the wall thickness of the sealing layer on the rear end surface, and the wall thickness of the sealing layer on the rear end surface is greater than or equal to the wall thickness of the sealing layer on the peripheral side surface; and / or The wall thickness of the sealing layer on the peripheral side is 0.5 mm to 1 mm; and / or The wall thickness of the sealing layer on the front end surface is 3 mm; and / or The wall thickness of the sealing layer on the rear end surface is 1 mm.

10. The water pump according to claim 6, characterized in that The motor also has a stator assembly, wherein: The front end cover is integrally connected to the stator assembly by injection molding; or The front end cover is provided with an inner cavity, in which an isolation sleeve is provided, the rotor is located in the inner cavity and nested inside the isolation sleeve, and the stator assembly is assembled in the inner cavity and nested outside the isolation sleeve.

11. A vehicle, characterized in that: Comprising the water pump according to any one of claims 1 to 10.

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