Inner rotor structure applied to automobile electronic water pump

Abstract

An inner rotor structure applied to an automobile electronic water pump comprises a shell, an upper cover and a rotating shaft, the upper cover is arranged on the shell, a rotor mounting cavity is formed between the upper cover and the shell, the rotating shaft penetrates through the center of the shell and the center of the upper cover, and the part, located in the rotor mounting cavity, of the rotating shaft is sleeved with a rotor assembly. The upper cover and the outer shell are sealed and fixedly connected through the sealing positioning structure, the outer shell and the upper cover are fixed in an injection molding or ultrasonic welding mode so as to ensure firmness and sealing performance of connection, and the connection mode can effectively reduce the loosening phenomenon caused by vibration or temperature change. Long-term stable operation of the automobile electronic water pump is guaranteed, the shell and the upper cover are both made of plastic materials, and the lightweight design of the automobile electronic water pump is improved. Therefore, the inner rotor not only has excellent corrosion resistance, but also can effectively reduce the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive electric water pumps, and particularly relates to an inner rotor structure applied to an automotive electric water pump. Background Art

[0002] In the prior art, the outer shell and the upper cover of an automotive electric water pump are usually supported by metal materials and fixed by welding. Although this method is firm, once the welding is completed, the sealing performance and fixing performance between the outer shell and the upper cover cannot be adjusted anymore. For an automotive electric water pump that needs to be frequently maintained and replaced, this design is obviously not flexible and convenient enough. Moreover, the outer shell and the upper cover made of metal materials will increase the weight of the inner rotor, thereby affecting the rotation of the rotor; after setting the upper cover and the outer shell as a split structure, the sealing performance will be affected. Therefore, how to provide an inner rotor structure of an automotive electric water pump with a simple structure, good sealing performance, convenient installation and easy maintenance has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0003] In view of this, the utility model provides an inner rotor structure applied to an automotive electric water pump.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] An inner rotor structure applied to an automotive electric water pump, comprising an outer shell, an upper cover and a rotating shaft. The upper cover is arranged on the outer shell. A rotor installation cavity is formed between the upper cover and the outer shell. The rotating shaft penetrates through the central positions of the outer shell and the upper cover. A rotor assembly is sleeved on the part of the rotating shaft located in the rotor installation cavity. A sealing and positioning structure is arranged between the upper cover and the outer shell. The upper cover and the outer shell are hermetically and fixedly connected through the sealing and positioning structure.

[0006] Preferably, the sealing and positioning structure comprises an outer shell fixing part and a stepped positioning structure. The part of the outer shell higher than the top end face of the rotor assembly forms the outer shell fixing part. The upper cover has a stepped positioning structure corresponding to the outer shell fixing part. The stepped positioning structure is arranged at the edge of the upper cover close to the outer shell. The stepped positioning structure has a positioning stepped part and a sealing stepped part. The outer shell fixing part abuts against the positioning stepped part and is fixedly connected with the upper cover.

[0007] Preferably, an outer sealing ring groove is formed between the sealing stepped part and the outer shell. An outer sealing ring is arranged in the outer sealing ring groove. The outer sealing ring is hermetically connected with the outer shell, the upper cover and the rotor assembly respectively.

[0008] Preferably, an inner sealing and positioning end of the upper cover is provided on the part of the upper cover extending into the rotor installation cavity. The inner sealing and positioning end of the upper cover is arranged in an annular structure on the side of the upper cover close to the rotating shaft. An inner sealing ring groove is formed between the inner sealing and positioning end of the upper cover and the rotating shaft. An inner sealing ring is arranged in the inner sealing ring groove, and the inner sealing ring is in sealing connection with the upper cover, the rotating shaft and the rotor assembly respectively.

[0009] Preferably, an installation hole for passing through the rotating shaft is opened at the bottom of the outer shell. A positioning rib protrudes from the inner wall of the installation hole towards the center of the installation hole. A plurality of positioning ribs are provided, and a bottom sealing ring is arranged on the positioning ribs. The rotor assembly presses the bottom sealing ring.

[0010] Preferably, the height of the positioning rib is lower than the height of the bottom of the inner wall of the rotor installation cavity, and the bottom sealing ring is in sealing connection with the positioning rib, the rotating shaft and the rotor assembly respectively.

[0011] Preferably, the rotor assembly includes rotor laminations and permanent magnets. The rotating shaft passes through the center of the rotor laminations. Magnet installation grooves are arranged on the rotor laminations. The magnet installation grooves are distributed at equal intervals in a ring shape with the rotating shaft as the center, and the permanent magnets are fixed in the magnet installation grooves.

[0012] The beneficial effects of the present utility model are as follows: The outer shell and the upper cover are fixed by injection molding or ultrasonic welding to ensure the firmness and sealing performance of the connection. This connection method can also effectively reduce the loosening phenomenon caused by vibration or temperature change, ensuring the long-term stable operation of the automotive electronic water pump. In this design, both the outer shell and the upper cover are made of plastic materials, further enhancing the lightweight design of the automotive electronic water pump. The inner rotor not only has excellent corrosion resistance, but also can effectively reduce production costs. At the same time, it has a positive effect on reducing the overall weight of the vehicle, reducing fuel consumption and emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Att Figure 1 is a schematic structural diagram of the present utility model;

[0015] Att Figure 2 is an exploded schematic structural diagram of the present utility model;

[0016] Att Figure 3 is a schematic cross-sectional structural diagram of the present utility model;

[0017] Appendix Figure 4 It is the enlarged view of part A in the appendix Figure 3 in the appendix Specific implementation manners

[0018] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] The present utility model will be further described below with reference to the accompanying drawings of the specification.

[0020] The present utility model provides the following technical solutions:

[0021] As shown in the appendix Figures 1-4 the present utility model discloses an inner rotor structure applied to an automotive electric water pump, including a housing 1, an upper cover 2 and a rotating shaft 3. The upper cover 2 is arranged on the housing 1. A rotor installation cavity 4 is formed between the upper cover 2 and the housing 1. The rotating shaft 3 penetrates through the central positions of the housing 1 and the upper cover 2. A rotor assembly 5 is sleeved on the part of the rotating shaft 3 located in the rotor installation cavity 4. A sealing and positioning structure 6 is arranged between the upper cover 2 and the housing 1. The upper cover 2 and the housing 1 are hermetically and fixedly connected through the sealing and positioning structure 6. Specifically, in this design, the housing 1 and the upper cover 2 are fixed by ultrasonic welding to ensure the firmness and tightness of the connection. This connection method can also effectively reduce the loosening phenomenon caused by vibration or temperature change, ensuring the long-term stable operation of the automotive electric water pump. And in this design, both the housing 1 and the upper cover 2 are made of plastic materials, further enhancing the lightweight design of the automotive electric water pump. The inner rotor not only has excellent corrosion resistance, but also can effectively reduce production costs. At the same time, it has a positive effect on reducing the overall weight of the vehicle, reducing fuel consumption and emissions.

[0022] Furthermore, the sealing and positioning structure 6 includes a housing fixing part 7 provided on the housing 1 and a stepped positioning structure 8 provided on the upper cover 2. The part of the housing 1 that is higher than the top end face of the rotor assembly 5 forms the housing fixing part 7. The stepped positioning structure 8 is provided at the edge of the upper cover 2 close to the housing 1. The stepped positioning structure 8 has a positioning step part 9 and a sealing step part 10. The housing fixing part 7 abuts against the positioning step part 9 and is fixedly connected to the upper cover 2. Specifically, in this embodiment, when the upper cover 2 with the stepped positioning structure 8 is installed, it will first be preliminarily positioned and docked with the housing fixing part 7 through the positioning step part 9, so that the upper cover 2 and the housing 1 can be accurately aligned during assembly, avoiding deviations during the assembly process. Then, through the tight fit between the sealing step part 10 and the housing fixing part 7, an effective sealing barrier is formed to ensure that the liquid in the rotor installation cavity 4 does not leak out, and at the same time prevent external impurities from entering the rotor installation cavity 4 and damaging the rotor assembly 5. After the housing fixing part 7 abuts against the positioning step part 9 of the upper cover 2, it is ultrasonically welded to the upper cover 2 to ensure the sealing performance and firmness of the connection part.

[0023] Furthermore, an outer sealing ring groove 11 is formed between the sealing step part 10 and the housing 1. An outer sealing ring 12 is arranged in the outer sealing ring groove 11. The outer sealing ring 12 is hermetically connected to the housing 1, the upper cover 2 and the rotor assembly 5 respectively. Specifically, in this embodiment, the outer sealing ring groove 11 formed between the sealing step part 10 and the housing 1, and the outer sealing ring 12 is arranged in the outer sealing ring groove 11. Such a structure further enhances the sealing performance of the automotive electronic water pump, ensuring that liquid or gas will not leak from the outer sealing ring groove 11. The outer sealing ring 12 is closely attached to the housing 1, the upper cover 2 and the rotor assembly 5, forming a solid sealing barrier, effectively preventing leakage problems caused by factors such as vibration, temperature change or pressure change.

[0024] Furthermore, an inner sealing and positioning end 13 of the upper cover is provided on the part of the upper cover 2 extending into the rotor installation cavity 4. The inner sealing and positioning end 13 of the upper cover is arranged in a ring structure on the side of the upper cover 2 close to the rotating shaft 3. An inner sealing ring groove 14 is formed between the inner sealing and positioning end 13 of the upper cover and the rotating shaft 3. An inner sealing ring 15 is arranged in the inner sealing ring groove 14. The inner sealing ring 15 is hermetically connected to the upper cover 2, the rotating shaft 3 and the rotor assembly 5 respectively. Specifically, in this embodiment, the setting of the inner sealing and positioning end 13 of the upper cover further enhances the internal sealing performance of the automotive electronic water pump. The inner sealing and positioning end 13 of the ring structure is closely attached around the rotating shaft 3, forming a narrow inner sealing ring groove 14 between it and the rotating shaft 3. The inner sealing ring 15 arranged in this inner sealing ring groove 14, together with the outer sealing ring 12, provides double protection for the automotive electronic water pump, ensuring that liquid or gas cannot leak from the inner sealing ring groove 14.

[0025] Further, an installation hole 16 for passing through the rotating shaft 3 is formed at the bottom of the housing 1. A positioning rib 17 protrudes towards the center of the installation hole 16 from the inner wall of the installation hole 16. A plurality of positioning ribs 17 are provided. A bottom sealing ring 18 is arranged on the positioning rib 17, and the rotor assembly 5 presses the bottom sealing ring 18. Specifically, in this embodiment, the arrangement of the positioning rib 17 enables an interference fit to be formed between the bottom sealing ring 18 and the rotating shaft 3, ensuring that the bottom sealing ring 18 is closely attached to the rotating shaft 3, thereby effectively preventing leakage of liquid or gas from the installation hole 16. In addition, the arrangement of the positioning rib 17 can also position and support the rotor assembly 5, ensuring that the rotor assembly 5 does not shift or shake during operation, and improving the operating efficiency and service life of the automotive electric water pump.

[0026] Further, the height of the positioning rib 17 is lower than the height of the bottom of the inner wall of the rotor installation cavity 4. The bottom sealing ring 18 is in sealing connection with the positioning rib 17, the rotating shaft 3, and the rotor assembly 5 respectively. Specifically, in this embodiment, the height of the positioning rib 17 is designed to be lower than the height of the bottom of the inner wall of the rotor installation cavity 4. Such a design is to ensure that the bottom sealing ring 18 has sufficient compression when being pressed, so as to form a tighter seal. At the same time, the sealing connection of the bottom sealing ring 18 with the positioning rib 17, the rotating shaft 3, and the rotor assembly 5 further enhances the sealing performance of the automotive electric water pump, effectively avoiding the leakage problem of liquid or gas from the installation hole 16.

[0027] Further, the rotor assembly 5 includes a rotor lamination 19 and a magnet 20. The rotating shaft 3 passes through the center of the rotor lamination 19. Magnet installation grooves 21 are provided on the rotor lamination 19. The magnet installation grooves 21 are annularly and equidistantly distributed centered on the rotating shaft 3. The magnet 20 is fixed in the magnet installation grooves 21. Specifically, in this embodiment, the cooperation with the motor stator is realized through the rotating shaft 3 arranged at the center of the rotor lamination 19. The magnet installation grooves 21 formed on the rotor lamination 19 not only facilitate the installation of the magnet 20, but also through the annular equidistant distribution design, enable the rotor to generate a uniform magnetic field during rotation, thereby improving the rotation efficiency and stability of the rotor. As a key component for generating the magnetic field, the magnet 20 is fixed in the magnet installation grooves 21 and is closely combined with the rotor lamination 19, ensuring the stability and persistence of the magnetic field.

[0028] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An inner rotor structure used in an automotive electronic water pump, characterized in that: The utility model comprises an outer shell, an upper cover and a rotating shaft, wherein the upper cover is arranged on the outer shell, a rotor installation cavity is formed between the upper cover and the outer shell, the rotating shaft passes through the center positions of the outer shell and the upper cover, a rotor assembly is sleeved on the part of the rotating shaft located in the rotor installation cavity, a sealing positioning structure is arranged between the upper cover and the outer shell, and the upper cover and the outer shell are sealed and fixedly connected through the sealing positioning structure.

2. The inner rotor structure for an automotive electronic water pump according to claim 1 is characterized in that: The sealing positioning structure includes a shell fixing portion and a step positioning structure. The portion of the shell that is higher than the top end surface of the rotor assembly forms the shell fixing portion. The upper cover has a step positioning structure corresponding to the shell fixing portion. The step positioning structure is arranged on an edge of the upper cover close to the shell. The step positioning structure has a positioning step portion and a sealing step portion. The shell fixing portion is against the positioning step portion and is fixedly connected to the upper cover.

3. The inner rotor structure for an automotive electronic water pump according to claim 2 is characterized in that: An outer sealing ring groove is formed between the sealing step portion and the outer shell, an outer sealing ring is arranged in the outer sealing ring groove, and the outer sealing ring is respectively sealed with the outer shell, the upper cover and the rotor assembly.

4. The inner rotor structure for an automotive electronic water pump according to claim 1 is characterized in that: An upper cover inner sealing positioning end is arranged on the portion of the upper cover extending into the rotor installation cavity. The upper cover inner sealing positioning end is annularly arranged on a side of the upper cover close to the rotating shaft. An inner sealing ring groove is formed between the upper cover inner sealing positioning end and the rotating shaft. An inner sealing ring is arranged in the inner sealing ring groove. The inner sealing ring is respectively sealed with the upper cover, the rotating shaft and the rotor assembly.

5. The inner rotor structure for an automotive electronic water pump according to claim 1 is characterized in that: The bottom of the shell is provided with a mounting hole for passing the rotating shaft, the inner wall of the mounting hole protrudes toward the center of the mounting hole to form a positioning rib, a plurality of the positioning ribs are provided, a bottom sealing ring is provided on the positioning rib, and the rotor assembly presses the bottom sealing ring.

6. The inner rotor structure for an automotive electronic water pump according to claim 5 is characterized in that: The height of the positioning rib is lower than the height of the bottom of the inner wall of the rotor installation cavity, and the bottom sealing ring is sealed with the positioning rib, the rotating shaft and the rotor assembly respectively.

7. The inner rotor structure for an automotive electronic water pump according to claim 1 is characterized in that: The rotor assembly includes rotor laminations and magnetic steel. The rotating shaft is arranged through the center of the rotor laminations. The rotor laminations are provided with magnetic steel mounting grooves. The magnetic steel mounting grooves are distributed in a circular shape with equal intervals around the rotating shaft. The magnetic steel is fixed in the magnetic steel mounting grooves.

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