Automotive electronic water pump and rotor assembly thereof

Abstract

The utility model discloses a vehicle electronic water pump and a rotor assembly thereof, and belongs to the technical field of vehicle electronic water pumps. Comprising a water pump shell, a rotor gasket, a rotor assembly, a stator assembly, a circuit board assembly, a rear cover and a rubber support, a surface-mounted motor structure is adopted, magnetic steel is directly fixed to the surface of a rotor iron core through iron core radial positioning grooves, the magnetic steel is more stable and not prone to falling off when the rotor iron core rotates at a high speed, the manufacturing process is simplified through the design, and the manufacturing cost is reduced. The manufacturing cost is reduced, magnetic leakage and air gaps are reduced, and the motor can generate larger torque under the same size; a circle of long groove and four short grooves are additionally formed in the surface of the rotor plastic-coated body, convex ribs corresponding to the long groove and the short grooves are arranged on the surface of the lower impeller injection molding body, and after the rotor plastic-coated assembly rotates, the lower impeller injection molding body is driven to partially rotate through friction force and meshing transmission among the long groove, the short grooves and the convex ribs. And the stator assembly has higher transmission efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle electronic water pumps, in particular to a vehicle electronic water pump and a rotor assembly thereof. Background Art

[0002] With the continuous development and progress of automotive electronic technology, the performance requirements of automotive electronic water pumps, as an important part of the automotive cooling system, are gradually increasing. The traditional automotive electronic water pump motor design usually adopts a DC brushless motor, of which the embedded structure and the surface-mounted motor structure are the two mainstream rotor structure designs.

[0003] The embedded structure protects the permanent magnets by embedding them inside the rotor core, thereby improving the inductance, torque and suspension force of the motor. However, this structure also brings about the problems of large magnetic leakage and large air gap, resulting in a relatively small motor torque generated by the embedded structure at the same volume. This limitation is particularly evident in situations where customers have a large demand for water pump torque, so the embedded structure is not suitable for these applications. In response to the above problems, the present invention proposes a design scheme for an automotive electronic water pump motor based on a surface-mounted motor structure. Utility Model Content

[0004] The purpose of the utility model is to provide a vehicle electronic water pump and a rotor assembly thereof to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: an electronic water pump for a vehicle and its rotor assembly include a stator assembly, a rotor assembly is installed on the stator assembly, a rotor gasket is installed on the rotor assembly, a rear cover is installed at one end of the stator assembly, a circuit board assembly is installed in the cavity formed by the stator assembly and the rear cover, a water pump housing is installed at the other end of the stator assembly, and a rubber bracket is installed on the stator assembly.

[0006] The rubber bracket is used to fix and install the entire automotive electronic water pump. A first chamber is formed between the water pump housing and the stator assembly, which are connected by welding, and the stator assembly and the rear cover are connected by welding; a temperature sensor is installed in the circuit board assembly, which is used to convert the external temperature change into an electrical signal and transmit it to the circuit board assembly, which is used to receive power and electrical signals and control the operation of the entire automotive electronic water pump.

[0007] The rotor assembly comprises a lower impeller assembly, which is mounted on the stator assembly, and an upper impeller is mounted on the lower impeller assembly. The lower impeller assembly and the upper impeller are connected by welding.

[0008] The lower impeller assembly includes a lower impeller injection molding body, a bearing is concentrically installed in the lower impeller injection molding body, a rotor overmolding assembly is installed on the lower impeller injection molding body, the bearing is installed on the stator assembly, and a convex rib is provided on the lower impeller injection molding body. The molded rotor overmolding assembly and the bearing are then placed in the mold, the mold axial positioning groove on the rotor overmolding body is fixed to the mold, and then the injection molding of the lower impeller assembly is completed.

[0009] The rotor plastic-coated assembly includes a rotor plastic-coated body, in which a rotor core is installed, a magnetic steel is installed on the rotor core, and the rotor plastic-coated body is installed on the bearing. The magnetic steel is first placed in the radial positioning groove of the core at the outer edge of the rotor core, and the radial positioning groove of the core plays a role in radial positioning of the magnetic steel. Then the rotor core is placed in the injection mold, and a positioning block is designed in the injection mold to play a role in axial positioning of the core and the magnetic steel. Then the injection-molded plastic-coated body is formed by injection molding, thereby completing the production of the rotor plastic-coated assembly.

[0010] The rotor overmolded body is provided with mold axial positioning grooves, short grooves and long grooves. The surface of the rotor overmolded body is provided with a circle of long grooves, and four evenly distributed short grooves are added inside the long grooves. The corresponding lower impeller injection molding body is provided with convex rib structures corresponding to the long grooves and short grooves. This structure can increase the radial strength between the rotor overmolded assembly and the lower impeller injection molding body.

[0011] The rotor core is provided with a core radial positioning groove, through which the rotor core fixes the magnetic steel thereon, so that the magnetic steel is more firm and stable when the rotor core rotates at high speed and is not easy to fall off.

[0012] The circuit board assembly adjusts the current according to the temperature signal fed back by the temperature sensor. When the temperature is too high, the circuit board assembly controls the current to increase, and the current flows into the stator assembly. The stator assembly generates a rotating magnetic field with a fixed direction and frequency under the action of the current. The magnetic field generated by the magnet in the rotor assembly interacts with the rotating magnetic field generated by the coil assembly, causing the magnet to rotate. Since the magnet is installed on the rotor core through the radial positioning groove of the core, the magnet drives the rotor core to rotate together, and the rotor core drives the rotor plastic body to rotate. Since the long grooves and short grooves on the rotor plastic body are embedded with the convex ribs on the lower impeller injection molding body, the lower impeller injection molding body rotates around the bearing driven by the rotor plastic body, and then the upper impeller assembly rotates and transmits kinetic energy to the upper impeller, causing the upper impeller to rotate together, and finally the centrifugal force generated by the rotation discharges the liquid in the first chamber from the water outlet on the water pump housing.

[0013] Compared with the prior art, the beneficial effects achieved by the utility model are as follows: the utility model adopts a surface-mounted motor structure, and the magnetic steel is directly fixed on the surface of the rotor core through the radial positioning groove of the core, so that the magnetic steel is more firm and stable when the rotor core rotates at high speed, and it is not easy to fall off, and the design simplifies the manufacturing process, reduces the manufacturing cost, reduces the leakage flux and the air gap, so that the motor can generate a larger torque under the same volume; a circle of long grooves and four short grooves are added to the surface of the rotor overmolded body, and convex ribs corresponding to the long grooves and the short grooves are arranged on the surface of the lower impeller injection-molded body. After the rotor overmolded assembly rotates, not only the friction force, but also the long grooves and the short grooves and the convex ribs will also engage with each other to drive the lower impeller injection-molded body to rotate, so that the stator assembly has a more efficient transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is an exploded view of the electronic water pump for vehicle of the utility model;

[0016] Figure 2 It is an elevation view of the rotor assembly of the utility model;

[0017] Figure 3 It is an exploded view of the lower impeller assembly of the utility model;

[0018] Figure 4 It is an exploded view of the rotor plastic-coated assembly of the utility model;

[0019] Figure 5 It is an elevation view of the injection molded body of the lower impeller of the utility model;

[0020] Figure 6 This is a bottom view of the rotor plastic package of the utility model;

[0021] Figure 7 It is a top view of the rotor core of the utility model;

[0022] In the figure: 1. water pump housing; 2. rotor gasket; 3. rotor assembly; 4. stator assembly; 5. circuit board assembly; 6. back cover; 7. rubber bracket; 31. upper impeller; 32. lower impeller assembly; 321. bearing; 322. lower impeller injection molding body; 323. rotor overmolding assembly; 324. long groove; 325. short groove; 326. convex rib; 3231. rotor overmolding body; 3232. magnetic steel; 3233. rotor core; 3234. mold axial positioning groove; 3235. core radial positioning groove. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-7 The utility model provides a technical solution: a vehicle electronic water pump and its rotor assembly 3 include a stator assembly 4, a rotor assembly 3 is installed on the stator assembly 4, a rotor gasket 2 is installed on the rotor assembly 3, a rear cover 6 is installed at one end of the stator assembly 4, a circuit board assembly 5 is installed in the cavity formed by the stator assembly 4 and the rear cover 6, a water pump housing 1 is installed at the other end of the stator assembly 4, and a rubber bracket 7 is installed on the stator assembly 4.

[0025] The rubber bracket 7 is used to fix and install the entire vehicle electronic water pump. A first chamber is formed between the water pump housing 1 and the stator assembly 4. The water pump housing 1 and the stator assembly 4 are connected by welding, and the stator assembly 4 and the rear cover 6 are connected by welding. A temperature sensor is installed in the circuit board assembly 5. The temperature sensor is used to convert the external temperature change into an electrical signal and transmit it to the circuit board assembly 5. The circuit board assembly 5 is used to receive power and electrical signals and control the operation of the entire vehicle electronic water pump.

[0026] The rotor assembly 3 includes a lower impeller assembly 32 , which is mounted on the stator assembly 4 , and an upper impeller 31 is mounted on the lower impeller assembly 32 .

[0027] The lower impeller assembly 32 is connected to the upper impeller 31 by welding. The rotor plastic-coated assembly 323 includes a rotor plastic-coated body 3231 , in which a rotor core 3233 is installed, on which a magnetic steel 3232 is installed, and the rotor plastic-coated body 3231 is installed on the bearing 321 .

[0028] First, the magnetic steel 3232 is placed in the radial positioning groove 3235 of the core at the outer edge of the rotor core 3233. The radial positioning groove 3235 of the core plays a role in radial positioning of the magnetic steel 3232. Then, the rotor core 3233 is placed in the injection mold. The injection mold is designed with a positioning block to play a role in axial positioning of the core and the magnetic steel 3232. Then, an injection-molded body is formed by injection molding, thereby completing the production of the rotor overmolded assembly 323.

[0029] The circuit board assembly 5 adjusts the current according to the temperature signal fed back by the temperature sensor. When the temperature is too high, the circuit board assembly 5 controls the current to increase, and the current flows into the stator assembly 4. The stator assembly 4 generates a rotating magnetic field with a fixed direction and frequency under the action of the current. The magnetic field generated by the magnet 3232 in the rotor assembly 3 interacts with the rotating magnetic field generated by the coil assembly, causing the magnet 3232 to rotate. Since the magnet 3232 is installed on the rotor core 3233 through the core radial positioning groove 3235, the magnet 3232 drives the rotor core 3233 to rotate together.

[0030] The lower impeller assembly 32 includes a lower impeller injection molding body 322 , in which a bearing 321 is concentrically mounted, a rotor overmolding assembly 323 is mounted on the lower impeller injection molding body 322 , the bearing 321 is mounted on the stator assembly 4 , and a convex rib 326 is provided on the lower impeller injection molding body 322 .

[0031] The molded rotor overmolded component 323 and the bearing 321 are then placed in the mold, so that the mold axial positioning groove 3234 on the rotor overmolded body 3231 is fixed to the mold, and then the injection molding of the lower impeller component 32 is completed.

[0032] The rotor core 3233 is provided with a core radial positioning groove 3235. The rotor core 3233 fixes the magnetic steel 3232 thereon through the core radial positioning groove 3235, so that the magnetic steel 3232 is more firm and stable when the rotor core 3233 rotates at a high speed and is not easy to fall off.

[0033] The rotor core 3233 drives the rotor overmolded body 3231 to rotate. Since the long groove 324 and the short groove 325 on the rotor overmolded body 3231 are engaged with the convex rib 326 on the lower impeller injection-molded body 322, the lower impeller injection-molded body 322 rotates around the bearing 321 driven by the rotor overmolded body 3231. Subsequently, the upper impeller 31 assembly rotates and transmits kinetic energy to the upper impeller 31, causing the upper impeller 31 to rotate together. Finally, the centrifugal force generated by the rotation discharges the liquid in the first chamber from the water outlet on the water pump housing 1.

[0034] The rotor overmolded body 3231 is provided with a mold axial positioning groove 3234, a short groove 325 and a long groove 324. The surface of the rotor overmolded body 3231 is provided with a circle of long grooves 324, and four evenly distributed short grooves 325 are added inside the long grooves 324. The corresponding lower impeller injection molding body 322 is provided with a convex rib 326 structure corresponding to the long grooves 324 and the short grooves 325. This structure can increase the radial strength between the rotor overmolded component 323 and the lower impeller injection molding body 322.

[0035] The working principle of the utility model is as follows: the circuit board assembly 5 adjusts the current size according to the temperature signal fed back by the temperature sensor. When the temperature is too high, the circuit board assembly 5 controls the current to increase, and the current flows into the stator assembly 4. The stator assembly 4 generates a rotating magnetic field with a fixed direction and frequency under the action of the current. The magnetic field generated by the magnetic steel 3232 in the rotor assembly 3 interacts with the rotating magnetic field generated by the coil assembly, causing the magnetic steel 3232 to rotate. Since the magnetic steel 3232 is installed on the rotor core 3233 through the radial positioning groove 3235 of the core, the magnetic steel 3 232 drives the rotor core 3233 to rotate together, and the rotor core 3233 drives the rotor overmolded body 3231 to rotate. Since the long groove 324 and the short groove 325 on the rotor overmolded body 3231 are engaged with the convex rib 326 on the lower impeller injection-molded body 322, the lower impeller injection-molded body 322 rotates around the bearing 321 driven by the rotor overmolded body 3231, and then the upper impeller 31 assembly rotates and transmits kinetic energy to the upper impeller 31, so that the upper impeller 31 rotates together, and finally the liquid in the first chamber is discharged from the water outlet on the water pump housing 1 through the centrifugal force generated by the rotation.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A vehicle electronic water pump and a rotor assembly thereof, characterized in that: The invention comprises a stator assembly (4), a rotor assembly (3) being mounted on the stator assembly (4), a rotor gasket (2) being mounted on the rotor assembly (3), a rear cover (6) being mounted on one end of the stator assembly (4), a circuit board assembly (5) being mounted in a cavity formed by the stator assembly (4) and the rear cover (6), a water pump housing (1) being mounted on the other end of the stator assembly (4), and a rubber bracket (7) being mounted on the stator assembly (4).

2. The vehicle electronic water pump and rotor assembly thereof according to claim 1, characterized in that: The rotor assembly (3) comprises a lower impeller assembly (32), wherein the lower impeller assembly (32) is mounted on the stator assembly (4), and an upper impeller (31) is mounted on the lower impeller assembly (32).

3. The vehicle electronic water pump and rotor assembly thereof according to claim 2, characterized in that: The lower impeller assembly (32) comprises a lower impeller injection-molded body (322), a bearing (321) is coaxially mounted inside the lower impeller injection-molded body (322), a rotor overmolded assembly (323) is mounted on the lower impeller injection-molded body (322), the bearing (321) is mounted on the stator assembly (4), and a convex rib (326) is provided on the lower impeller injection-molded body (322).

4. The vehicle electronic water pump and rotor assembly thereof according to claim 3, characterized in that: The rotor overmolding assembly (323) comprises a rotor overmolding body (3231), a rotor core (3233) is installed in the rotor overmolding body (3231), a magnetic steel (3232) is installed on the rotor core (3233), and the rotor overmolding body (3231) is installed on a bearing (321).

5. The vehicle electronic water pump and rotor assembly thereof according to claim 4, characterized in that: The rotor plastic-encased body (3231) is respectively provided with a mold axial positioning groove (3234), a short groove (325) and a long groove (324).

6. The vehicle electronic water pump and rotor assembly thereof according to claim 4, characterized in that: The rotor core (3233) is provided with an iron core radial positioning groove (3235).

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