Rotor for an automotive electric water pump

Abstract

The application provides a rotor for an automotive electronic water pump, comprising a rotor shaft, an impeller in rotational cooperation with the rotor shaft, the impeller being coaxially provided with a mounting portion, an outer portion of the mounting portion being provided with a rotor core, an outer portion of the rotor core being provided with a plurality of permanent magnets, the permanent magnets being uniformly and spacedly arranged around an axis of the impeller, and further comprising a protective sleeve, the protective sleeve being in axial anti-movement cooperation with the impeller, an inner circumferential surface of the protective sleeve being in radial limiting cooperation with the permanent magnets, the protective sleeve being made of stainless steel and being in axial anti-movement cooperation with the impeller by being externally sleeved on the permanent magnets, the permanent magnets being fixedly bonded to the rotor core by bonding, and then being externally sleeved on the permanent magnets by the protective sleeve for circumferential limiting, so that the protective effect is improved, the problem of separation of the permanent magnets from the rotor core is effectively reduced, and the reliability of the rotor is improved.

Description

Technical Field

[0001] This utility model relates to the field of electronic water pump technology, and in particular to a rotor for automotive electronic water pumps. Background Technology

[0002] Currently, the rotor of an automotive electronic water pump mainly consists of a rotor shaft, a rotor core mounted on the rotor shaft, and a permanent magnet located outside the rotor core. The permanent magnet is fixed to the rotor core by adhesive bonding. When the electronic water pump is working, problems such as poor fixing may cause the permanent magnet to fall off. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems by providing a rotor for an automotive electronic water pump.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: a rotor for an automotive electronic water pump, comprising a rotor shaft and an impeller rotatably coupled with the rotor shaft. The impeller is coaxially provided with a mounting part, and a rotor core is provided outside the mounting part. Multiple permanent magnets are provided outside the rotor core, and the permanent magnets are evenly spaced around the axis of the impeller. The system also includes a protective sleeve, which is axially anti-movement coupled with the impeller, and the inner circumference of the protective sleeve is radially limited to the permanent magnets.

[0005] Furthermore, the permanent magnet includes an arc-shaped surface, which is disposed opposite to the rotor shaft, and the inner circumferential surface of the protective sleeve is tangent to the arc-shaped surface of each permanent magnet.

[0006] Furthermore, the outer circumferential surface of the rotor core is provided with a plurality of positioning parts evenly spaced apart, and an installation plane is provided between every two positioning parts. Each positioning part is provided with limiting inclined surfaces on both sides, and the angle α between each limiting inclined surface and the corresponding installation plane is an acute angle. The permanent magnet includes a mating plane disposed opposite to the arc-shaped surface. Both ends of the mating plane are provided with a first side surface at the junction with the arc-shaped surface. The angle between the first side surface and the mating plane is β, where β is not greater than α.

[0007] Furthermore, the limiting inclined surface is parallel to the axis of the rotor shaft.

[0008] Furthermore, along the axial direction of the rotor shaft, each positioning part is provided with a clearance groove; the clearance groove is located on two limiting inclined surfaces on each positioning part and is symmetrically arranged about the clearance groove.

[0009] Furthermore, the inner circumferential surface of the protective sleeve is provided with multiple ribs that correspond one-to-one with the clearance grooves. The ribs are inserted into the clearance grooves, and the two sides of the ribs abut against and slide against the sides of the clearance grooves.

[0010] Furthermore, at the end of the rotor core opposite to the impeller, each of the positioning parts has a cutting area at its end, and a guide groove is provided corresponding to the positioning part and the clearance groove, with the guide groove penetrating the positioning part.

[0011] Furthermore, a guide slope is provided at the end of the clearance groove near the cutting area.

[0012] Furthermore, the mounting part has a positioning surface and an end face arranged opposite to each other at both ends. An annular surface is also provided on the side of the end face close to the positioning surface. The annular surface is coaxial with the rotor shaft. The protective sleeve is fitted on the annular surface, with one end abutting against the end face and the other end bent inward to form a limiting plate. One side of the limiting plate is limited and matched with the positioning surface, and the other side is limited and matched with the permanent magnet.

[0013] Compared with the prior art, the rotor for automotive electronic water pump disclosed in this utility model has the following advantages: By covering the permanent magnet with a protective sleeve, which can be made of stainless steel and is axially anti-movement fitted with the impeller, the permanent magnet can be fixedly bonded to the rotor core by adhesive bonding. Then, the protective sleeve is placed on the outside of the permanent magnet for circumferential limiting, thereby improving the protection effect, effectively reducing the problem of separation between the permanent magnet and the rotor core, and improving the reliability of the rotor. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the rotor for the automotive electronic water pump of this utility model.

[0015] Figure 2 This is a cross-sectional structural schematic diagram of the rotor for an automotive electronic water pump according to this utility model.

[0016] Figure 3 for Figure 2 The diagram shows a partially enlarged structural schematic of point A in this utility model.

[0017] Figure 4 This is a schematic diagram of the rotor structure for an automotive electronic water pump according to this utility model. Figure 2 .

[0018] Figure 5 This is a schematic diagram of the protective sleeve structure in the rotor of the automotive electronic water pump of this utility model.

[0019] Figure 6 This is a top view of the protective sleeve in this utility model.

[0020] Figure 7 This is a schematic diagram of the connection structure of the rotor core and permanent magnet in this utility model. Figure 1 .

[0021] Figure 8 This is a schematic diagram of the connection structure of the rotor core and permanent magnet in this utility model. Figure 2 .

[0022] Figure 9 for Figure 8 The diagram shows a partially enlarged structural schematic at point B in this utility model.

[0023] Figure 10 This is an axial view of the rotor core and permanent magnet in this utility model.

[0024] Figure 11 for Figure 10 The diagram shows a partially enlarged structural schematic at point C in this invention.

[0025] Figure 12 for Figure 6 The diagram shows a partially enlarged structural schematic at point D in this invention.

[0026] In the diagram: 10, impeller; 100, mounting part; 101, positioning surface; 102, annular surface; 103, end face; 11, protective sleeve; 110, limiting plate; 111, rib; 12, rotor shaft; 120, nut; 121, washer; 13, bearing; 14, rotor core; 140, positioning part; 1400, clearance groove; 1401, limiting inclined surface; 1402, guide inclined surface; 1403, guide groove; 141, mounting plane; 15, permanent magnet; 150, first side surface. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0028] Please refer to Figure 1-12 This utility model provides a rotor for an automotive electronic water pump. As a specific embodiment, it includes a rotor shaft 12 and an impeller 10 rotatably coupled to the rotor shaft 12. The impeller 10 is coaxially provided with a mounting part 100. A rotor core 14 is provided outside the mounting part 100. A plurality of permanent magnets 15 are provided outside the rotor core 14. The permanent magnets 15 are evenly spaced around the axis of the impeller 10. It also includes a protective sleeve 11. The protective sleeve 11 is axially anti-movement coupled with the impeller 10, and the inner circumference of the protective sleeve 11 is radially limited to the permanent magnets 15.

[0029] Specifically, the rotor structure in this application includes a rotor shaft 12. During operation, the lower end of the rotor shaft 12 engages with the housing of the electronic water pump, providing support for the rotor shaft 12. A bearing 13 is provided on the outside of the rotor shaft 12, and a nut 120 is threadedly connected to the upper end of the rotor shaft 12. A washer 121 is provided between the nut and the bearing 13 to limit the bearing 13. The bearing 13 is made of graphite. An impeller 10 is rotatably mounted on the outside of the graphite bearing 13. The impeller 10 is integrally injection molded, and a mounting part 100 is coaxially provided on the outer circumferential surface of the impeller 10. The rotor core 14 is mounted on the outside of the mounting part 100 and engages with the impeller 10 in a non-rotational manner. Multiple permanent magnets 15 are evenly spaced on the outer circumferential surface of the rotor core 14. This application provides a protective sleeve 11 on the outside of the permanent magnets 15. The protective sleeve 11 can be made of stainless steel, and the protective sleeve 11 engages with the impeller 10 in an axial anti-movement fit. With this setup, the permanent magnet 15 can be fixedly bonded to the rotor core 14 by adhesive bonding, and then the protective sleeve 11 is placed on the outside of the permanent magnet 15 for circumferential limiting, thereby improving the protection effect and effectively reducing the problem of separation between the permanent magnet 15 and the rotor core 14, thus improving the reliability of the rotor.

[0030] Furthermore, as a specific implementation method, refer to Figure 2 , Figure 3 The mounting part 100 has a positioning surface 101 and an end face 103 arranged opposite to each other at both ends. An annular surface 102 is also provided on the side of the end face 103 near the positioning surface 101. The annular surface 102 is coaxial with the rotor shaft 12. The protective sleeve 11 is fitted on the annular surface 102, with one end abutting against the end face 103 and the other end bent inward to form a limiting plate 110. One side of the limiting plate 110 is limited and cooperates with the positioning surface 101, and the other side is limited and cooperates with the permanent magnet 15. Specifically, at both ends of the mounting part 100, one end is provided with an annular surface 102. After the protective sleeve 11 is fitted onto the annular surface 102, its inner circumferential surface fits tightly with the annular surface 102, and its end abuts against the end face 103. The lower end of the protective sleeve 11 is bent inward and integrally provided with a limiting plate 110. The end of the mounting part 100 is provided with a flange plate, wherein the positioning surface 101 is the plate surface of the flange plate, which abuts against the limiting plate 110. The protective sleeve 11 is axially limited by the cooperation of the positioning surface 101 and the end face 103, and the limiting plate 110 of the protective sleeve 11 can limit the end of the permanent magnet 15.

[0031] Furthermore, as a specific implementation method, refer to Figure 6The permanent magnet 15 includes an arc-shaped surface, which is positioned opposite to the rotor shaft 12. The inner circumferential surface of the protective sleeve 11 is tangent to the arc-shaped surface of each permanent magnet 15. Specifically, the permanent magnet 15 has a strip-shaped structure and is arranged along the axial direction of the rotor shaft 12. By setting one side as an arc-shaped surface, the arc-shaped surface can be tangent to the inner circumferential surface of the protective sleeve 11, and the two are in line contact. This arrangement can effectively limit the radial movement of the permanent magnet 15 through the protective sleeve 11, and also facilitates the axial placement of the protective sleeve 11 on the outside of the permanent magnet 15, which is beneficial for assembly.

[0032] Furthermore, as a specific implementation method, refer to Figure 6 , Figure 7 , Figure 10 , Figure 11 The outer circumferential surface of the rotor core 14 is provided with a plurality of positioning parts 140 evenly spaced. A mounting plane 141 is provided between every two positioning parts 140. Limiting inclined surfaces 1401 are provided on both sides of each positioning part 140. The angle α between each limiting inclined surface 1401 and the corresponding mounting plane 141 is an acute angle.

[0033] The permanent magnet 15 includes a mating plane that is opposite to the arc-shaped surface. A first side surface 150 is provided at the junction of the two ends of the mating plane and the arc-shaped surface. The angle between the first side surface 150 and the mating plane is β, where β is not greater than α.

[0034] Specifically, each permanent magnet 15 includes a mating plane opposite to the arc surface. Multiple positioning portions 140 are evenly spaced on the outer circumference of the rotor core 14. A mounting plane 141 is formed between two positioning portions 140, and the included angle between adjacent mounting planes 141 is equal. A limiting inclined surface 1401 is provided on the positioning portion 140, and a first side surface 150 is provided on the permanent magnet 15. With this arrangement, the permanent magnet 15 can be installed between the positioning portion 140 and the mounting plane 141 via axial insertion. In this case, the limiting inclined surface 1401 and the first side surface 150 can cooperate to radially limit the permanent magnet 15, achieving a better limiting effect.

[0035] As a specific implementation method, β = α - (0 - 2)° Furthermore, as a specific implementation, the limiting inclined surface 1401 is parallel to the axis of the rotor shaft 12.

[0036] Furthermore, as a specific implementation, along the axial direction of the rotor shaft 12, each positioning part 140 is provided with a relief groove 1400, and the relief groove 1400 is located on each positioning part 140 with two limiting inclined surfaces 1401 symmetrically arranged about the relief groove 1400.

[0037] Specifically, by providing a clearance groove 1400 on the positioning part 140, an elastic arm is formed between the root of the limiting inclined surface 1401 and the clearance groove 1400, thereby enabling the limiting inclined surfaces 1401 on both sides of the positioning part 140 to have an inward clearance effect. When the permanent magnet 15 is inserted between the two positioning parts 140, the elastic arm clearance occurs, which facilitates the insertion of the permanent magnet 15.

[0038] Furthermore; as a preferred embodiment, refer to Figure 5 , Figure 6 , Figure 8 - Figure 12 The inner circumferential surface of the protective sleeve 11 is provided with multiple ribs 111 that correspond one-to-one with the relief groove 1400. The ribs 111 are inserted into the relief groove 1400, and the two sides of the ribs 111 abut against and slide against the sides of the relief groove 1400.

[0039] Specifically, the rib 111 is welded to the protective sleeve 11, and the rib 111 can be inserted into the relief groove 1400. With this arrangement, when the protective sleeve 11 is put on the outside of the permanent magnet 15, the rib 111 and the relief groove 1400 correspond one-to-one. By inserting the protective sleeve 11 into the relief groove 1400, the carbon arm can be prevented from avoiding the relief, thereby ensuring the locking and limiting effect on the permanent magnet 15.

[0040] Furthermore, as a specific implementation, it is understood that if the clearance groove 1400 is set too long, the friction between the rib 111 and the side of the clearance groove 1400 will be too large during the installation of the protective sleeve 11, affecting the assembly. This application addresses this by providing a cutting area at the end of each positioning part 140 located opposite to the rotor core 14 and the impeller 10. A guide groove 1403 is provided corresponding to each positioning part 140 and the clearance groove 1400, and the guide groove 1403 penetrates through the positioning part 140. By providing the cutting area, the distance of the clearance groove 1400 can be shortened, facilitating the assembly of the protective sleeve 11. By providing the guide groove 1403, the edge position of the rib 111 can be guided, facilitating accurate alignment and assembly of the rib 111 with the clearance groove 1400.

[0041] Furthermore; as a specific implementation method, refer to Figure 9 The clearance groove 1400 is provided with a guide slope 1402 at one end near the cutting area. The guide slope 1402 at the end of the clearance groove 1400 can guide the rib 111, which is convenient for guiding the rib 111 when assembling the protective sleeve 11 with the rotor core 14 and the permanent magnet 15, and is more conducive to assembly.

[0042] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A rotor for an automotive electronic water pump, comprising a rotor shaft (12) and an impeller (10) rotatably coupled to the rotor shaft (12), wherein the impeller (10) is coaxially provided with a mounting portion (100), a rotor core (14) is provided outside the mounting portion (100), and a plurality of permanent magnets (15) are provided outside the rotor core (14), the permanent magnets (15) being evenly spaced around the axis of the impeller (10), characterized in that, It also includes a protective sleeve (11), which is axially anti-movement fitted with the impeller (10), and the inner circumference of the protective sleeve (11) is radially limited to the permanent magnet (15).

2. The rotor for an automotive electronic water pump according to claim 1, characterized in that, The permanent magnet (15) includes an arc-shaped surface, which is disposed opposite to the rotor shaft (12), and the inner circumferential surface of the protective sleeve (11) is tangent to the arc-shaped surface of each permanent magnet (15).

3. The rotor for an automotive electronic water pump according to claim 1, characterized in that, The outer circumferential surface of the rotor core (14) is provided with a plurality of positioning parts (140) evenly spaced apart. A mounting plane (141) is provided between every two positioning parts (140). Limiting inclined surfaces (1401) are provided on both sides of each positioning part (140). The angle α between each limiting inclined surface (1401) and the corresponding mounting plane (141) is an acute angle. The permanent magnet (15) includes a mating plane that is opposite to the arc surface. Both ends of the mating plane are provided with a first side surface (150) at the junction with the arc surface. The angle between the first side surface (150) and the mating plane is β, where β is not greater than α.

4. The rotor for an automotive electronic water pump according to claim 3, characterized in that, The limiting inclined surface (1401) is parallel to the axis of the rotor shaft (12).

5. The rotor for an automotive electronic water pump according to claim 4, characterized in that, Along the axial direction of the rotor shaft (12), each positioning part (140) is provided with a relief groove (1400); the relief groove (1400) is located on two limiting inclined surfaces (1401) on each positioning part (140) and is symmetrically arranged about the relief groove (1400).

6. The rotor for an automotive electronic water pump according to claim 5, characterized in that, The inner circumferential surface of the protective sleeve (11) is provided with multiple ribs (111) that correspond one-to-one with the relief groove (1400). The ribs (111) are inserted into the relief groove (1400), and the two sides of the ribs (111) abut against and slide against the sides of the relief groove (1400).

7. The rotor for an automotive electronic water pump according to claim 6, characterized in that, Located at the end opposite to the rotor core (14) and the impeller (10), each of the positioning parts (140) has a cutting area at its end. The positioning part (140) and the clearance groove (1400) are respectively provided with guide grooves (1403), and the guide grooves (1403) pass through the positioning part (140).

8. The rotor for an automotive electronic water pump according to claim 7, characterized in that, The clearance groove (1400) is provided with a guide slope (1402) at one end near the cutting area.

9. The rotor for an automotive electronic water pump according to claim 1, characterized in that, The mounting part (100) has a positioning surface (101) and an end face (103) arranged opposite to each other at both ends. An annular surface (102) is also provided on the side of the end face (103) near the positioning surface (101). The annular surface (102) is coaxial with the rotor shaft (12). The protective sleeve (11) is fitted on the annular surface (102), with one end abutting against the end face (103) and the other end bent inward to form a limiting plate (110). One side of the limiting plate (110) is limited to the positioning surface (101), and the other side is limited to the permanent magnet (15).

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