Electric oil pump

Abstract

The present invention relates to an electric motor oil pump, comprising: a mechanical portion and a control portion detachably connected to the mechanical portion, wherein the mechanical portion includes a rotor, a stator surrounding the rotor, a rotating shaft connected to the rotor, a mounting seat coaxial with the rotating shaft for supporting the rotating shaft, and a base for supporting the mounting seat; the stator includes a working end and a positioning end; the working end is arranged opposite to the rotor; the inner wall of the positioning end abuts the outer wall of the mounting seat. According to the electric motor oil pump of the present invention, the rotor's rotating shaft is positioned using an end cap based on the stator diameter at the motor magnetic circuit air gap portion of the electric motor oil pump, thereby achieving precise positioning of the rotor, ensuring the accuracy of the magnetic circuit air gap between the rotor and stator in the inner rotor mode, and achieving good concentricity between the stator and rotor, thereby improving the performance of the electric motor oil pump.

Description

Technical Field

[0001] The invention relates to an electric motor oil pump. Background Art

[0002] Electric motor oil pumps typically have either an inner rotor or outer rotor configuration. In the inner rotor configuration, the rotor is located within the inner diameter of the motor's stator, while in the outer rotor configuration, the rotor is located within the outer diameter of the stator (i.e., outside the stator). Typically, outer rotor electric motor oil pumps have a larger deviation in the magnetic air gap between the rotor and stator. This is because the rotor is positioned by the centrally located rotating shaft. When the rotor is located outside the stator, additional structures are required to connect the rotating shaft and rotor. This increase in components increases the cumulative tolerances, which in turn increases the deviation in the magnetic air gap between the rotor and stator.

[0003] In addition, in the existing technology, although the inner rotor mode electric motor oil pump is more common, the deviation of the magnetic circuit air gap between the rotor and the stator cannot be truly solved. This is because the positioning between the rotor and the stator usually uses an injection molded shell supporting the stator as a positioning part. The size of the injection molded shell cannot be accurately controlled, and it is easy to deform during use, resulting in poor concentricity between the rotor and the stator, which in turn affects the accuracy of the magnetic circuit air gap.

[0004] In addition, existing technologies also include electric oil pumps with inner rotors that utilize a suspended rotor. Although these electric oil pumps do not utilize an injection-molded housing for positioning as described above, the uncertainty of the suspended rotor's position prevents its positioning relative to the stator from being fixed. Consequently, the concentricity requirements between the suspended rotor and stator are relaxed, significantly impacting the accuracy of the magnetic air gap and resulting in significant air gap deviation. Therefore, electric oil pumps with inner rotors that utilize similar suspended rotors do not require high concentricity between the rotor and stator. This is because the application scenarios and functional requirements for these electric oil pumps are not stringent, limiting their use. They are unable to meet stringent concentricity requirements. Summary of the Invention

[0005] The object of the present invention is to solve the above-mentioned problem and provide an electric motor oil pump capable of ensuring the accuracy of the magnetic circuit air gap between the rotor and the stator.

[0006] To achieve the above-mentioned object, the present invention provides an electric motor oil pump, comprising: a mechanical portion and a control portion detachably connected to the mechanical portion, wherein the mechanical portion comprises a rotor, a stator mating with the rotor, a rotating shaft connected to the rotor, a mounting seat for supporting the rotating shaft, and a base for supporting the mounting seat;

[0007] The stator includes a working end and a positioning end;

[0008] The working end is arranged opposite to the rotor;

[0009] The positioning end abuts against the mounting seat.

[0010] According to one aspect of the present invention, the rotor includes a rotating body supported on the rotating shaft and a permanent magnet provided on the rotating body.

[0011] According to one aspect of the present invention, the rotating body is provided at the end of the rotating shaft, and the permanent magnet is provided on the outer wall of the rotating body opposite to the working end of the stator.

[0012] According to one aspect of the present invention, a concave cavity is provided at one end of the rotating body facing the mounting seat.

[0013] According to one aspect of the present invention, the mounting seat is a stepped sleeve structure, the first step of the mounting seat is supported on the base, the outer wall of the second step abuts against the inner wall of the positioning end, and the third step extends into the concave cavity.

[0014] According to one aspect of the present invention, the rotating body is arranged at the end of the rotating shaft, and a cavity is provided at one end of the rotating body facing the mounting seat, the working end of the stator is located in the cavity, and the permanent magnet is arranged on the side wall of the cavity of the rotating body opposite to the working end.

[0015] According to one aspect of the present invention, the mounting seat has a mounting groove for mounting the positioning end of the stator, and the outer wall of the positioning end abuts against the side wall of the mounting groove.

[0016] According to one aspect of the present invention, a pump cavity for mounting internal and external gears for achieving pumping function is provided on the mounting seat and / or the base.

[0017] According to one aspect of the present invention, the control portion includes an end cover having an inner cavity, a circuit board located in the inner cavity of the end cover, and an electrical connection port for connecting to an external power source and provided on an outer wall of the end cover;

[0018] The end cover covers the mechanical part, and the inner cavity of the end cover is connected with the mechanical part to form the inner chamber of the electric motor oil pump.

[0019] According to one aspect of the present invention, the mounting seat is provided with an oil inlet and an oil outlet or

[0020] The base is provided with an oil inlet and an oil outlet or

[0021] The mounting seat and the base are respectively provided with an oil inlet and an oil outlet.

[0022] According to one embodiment of the present invention, the stator diameter at the air gap portion of the motor magnetic circuit of the electric motor oil pump is used as a reference, and the rotating shaft of the rotor is positioned using an end cover, thereby achieving precise positioning of the rotor, ensuring the accuracy of the magnetic circuit air gap between the rotor and the stator in the inner rotor mode, and achieving good concentricity between the stator and the rotor, thereby improving the performance of the electric motor oil pump.

[0023] According to one embodiment of the present invention, the mounting base is a stepped sleeve structure, with the first step of the mounting base supported on the base, the outer wall of the second step abutting the inner wall of the stator's positioning end, and the third step extending into the aforementioned cavity. This arrangement improves the mounting base's structural stability and secures its positioning with the rotating shaft. This is because the first step, with its maximum contact area, supports the base, ensuring overall structural stability; the second step abuts the stator, ensuring positioning accuracy as described above; and extending the third step into the aforementioned cavity increases the mating area between the rotating shaft and the mounting base, making the installation and positioning of the rotating shaft more stable and precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A cross-sectional view schematically illustrates a conventional electric motor oil pump;

[0025] Figure 2 A cross-sectional view schematically showing an electric motor oil pump according to one embodiment of the present invention;

[0026] Figure 3 A cross-sectional view schematically shows a mechanical portion of an electric oil pump according to another embodiment of the present invention. DETAILED DESCRIPTION

[0027] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0028] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0030] Figure 1 A cross-sectional view of a conventional electric motor oil pump is shown schematically. Figure 1 As shown, the magnetic air gap between the rotor A and stator B of a conventional electric oil pump is determined by positioning the stator B with the injection-molded housing C supporting the stator B. However, this positioning is subject to errors. First, the dimensions of the injection-molded housing C are difficult to precisely control, resulting in dimensional errors when positioning the housing C. Second, during assembly and use of the electric oil pump, vibration and other factors can cause the molded housing to be squeezed at its location, causing deformation and affecting positioning accuracy. This, in turn, affects the accuracy of the magnetic air gap between the rotor and stator, leading to increased deviations.

[0031] To solve problems such as Figure 1 In order to solve the above-mentioned problems existing in the electric motor oil pump shown in the figure, the present invention redesigns the positioning part so that the positioning between the rotor and the stator is stable and reliable, reducing the cumulative errors due to manufacturing and use, so that the magnetic circuit air gap between the stator and the rotor is maintained within a high precision range, ensuring the concentricity of the rotor and the stator, thereby ensuring that the electric motor oil pump of the present invention has higher product performance and longer service life.

[0032] The following describes in detail the improvements made by the present invention on the above-mentioned existing electric motor oil pump to achieve the above-mentioned effects with reference to the accompanying drawings.

[0033] Figure 2 Schematically shows a cross-sectional view of an electric motor oil pump according to an embodiment of the present invention. Figure 2 As shown, in this embodiment, the electric oil pump includes a mechanical portion 1 and a control portion 2 for controlling the mechanical power supply. Mechanical portion 1 comprises a rotor 101, a stator 102, a rotating shaft 103, a mounting base 104, and a base 105. Stator 102 surrounds the exterior of rotor 101, forming an inner rotor electric oil pump. Rotating shaft 103 is connected to rotor 101, and rotor 101 is located at the upper end of rotating shaft 103. Mounting base 104 supports rotating shaft 103. Base 105 supports mounting base 104.

[0034] In this embodiment, the rotor 101 is located at the upper end of the rotation shaft 103 , but the rotor 101 may be provided at another position on the rotation shaft 103 .

[0035] Furthermore, if Figure 2As shown in the figure, in this embodiment, the stator 102 includes a working end 1021 and a positioning end 1022. The working end 1021 is the portion opposite to the rotor shown in the figure, and the positioning end 1022 is the portion extending downward beyond the length of the rotor shown in the figure. Figure 2 As shown, in this embodiment, the inner wall of the positioning end 1022 of the stator 102 abuts against the outer wall of the mounting seat 104. This realizes the redesigned positioning portion of the present invention, ensuring that the positioning between the stator and the rotor is stable and reliable, and the accuracy of the magnetic circuit air gap is high. Figure 2 It can be seen that in this embodiment, the silicon steel sheets of the stator 102 are actually abutted against the mounting seat 104, and the mounting seat 104 is used to ensure the position accuracy of the rotating shaft 103, thereby ensuring the position accuracy of the rotor 101 relative to the stator 102. Because the aforementioned abutment is achieved by the silicon steel sheets of the stator 102 abutting against the mounting seat 104, the dimensional accuracy of the silicon steel sheets can be guaranteed, and they are not easily deformed during use. Furthermore, in this embodiment, the mounting seat 104 is a stepped sleeve structure, and the sleeve structure is usually made of metal material. Therefore, the size of the mounting seat 104 can also be guaranteed, and it is also not easily deformed during use. Therefore, when the mounting seat 104 is abutted and positioned with the stator 102, the problems in the above-mentioned prior art can be solved, so that the concentricity of the stator 102 and the rotor 101 is good, the accuracy of the magnetic circuit air gap is high, and the performance of the electric motor oil pump is improved.

[0036] like Figure 2 As shown in FIG. 1 , in this embodiment, the rotor 101 includes a rotating body 1011 supported on the upper end of the rotating shaft 103 and a permanent magnet 1012 provided on the outer wall of the rotating body 1011. Figure 2 As shown, a concave cavity 1011 a is provided at the lower end of the rotating body 1011 , ie, the end facing the mounting seat 104 .

[0037] As described above, in this embodiment, the mounting seat 104 is a stepped sleeve structure, such as Figure 2 As shown, the first step 1041 of the mounting base 104 is supported on the base 105, the outer wall of the second step 1042 abuts the inner wall of the positioning end 1022 of the stator 102, and the third step 1043 extends into the aforementioned concave cavity 1011a. This arrangement improves the structural stability of the mounting base 104 and makes its positioning with the rotating shaft 103 more stable. This is because the first step 1041, which has the largest contact area, is used for support with the base 105, which ensures the stability of the overall structure; the second step 1042 abuts against the stator 102 to ensure the aforementioned positioning accuracy; and the extension of the third step 1043 into the aforementioned concave cavity 1011a increases the mating area between the rotating shaft 103 and the mounting base 104, making the installation and positioning of the rotating shaft 103 more stable and precise.

[0038] like Figure 2 As shown, the mounting base 104 is provided with a pump chamber 1044 on one side facing the base 105. The pump chamber 1044 is mainly used to realize the pump suction and discharge of oil through the meshing rotation of the internal gear N and the external gear W. In addition, in the present invention, the pump chamber is provided with a pump chamber 1044 in addition to the pump chamber 1044. Figure 2 The mounting base 104 may be provided in the middle, and may also be provided on the base 105 according to the needs of the structural arrangement; or may be provided partially on the mounting base 104 and partially on the base 105.

[0039] In addition, if Figure 2 As shown, in this embodiment, the control part 2 includes an end cover 201 with an inner cavity, a circuit board 202 located in the inner cavity of the end cover 201, and an electrical connection port 203 for connecting to an external power source and provided on the outer wall of the end cover 201.

[0040] In this embodiment, the base 105 is provided with an oil inlet 1052 and an oil outlet 1051. In the present invention, the oil inlet and the oil outlet may also be provided on the mounting base 104, or may be provided on the mounting base 104 and the base 105 respectively.

[0041] Although the permanent magnet 1012 is disposed on the outer wall of the rotating body 1011 in this embodiment, the position of the permanent magnet 1012 on the rotating body 1011 is not limited to the outer wall. In addition, the rotating body 1011 itself may be a permanent magnet.

[0042] Figure 3 Schematically shows the structure of the mechanical part of the motor oil pump according to another embodiment of the present invention. Figure 3 As shown, in this embodiment, an outer rotor mode electric motor oil pump is provided. The components of the electric motor oil pump are the same as those of the inner rotor mode electric motor oil pump described above. The difference lies in the change of the overall structure. In particular, as follows: Figure 3 As shown, in this embodiment, the structure and positioning of the rotor and stator are different from those in the first embodiment. In this embodiment, the rotor 101 includes a rotating body 1011 supported at the end of the rotating shaft and a permanent magnet 1012 provided on the rotating body 1011. Figure 3 As shown, the end of the rotating body 1011 facing the mounting base 104 is provided with a cavity 1011a, and the working end 1021 of the stator 102 is disposed in this cavity 1011a, and the permanent magnet 1012 is also disposed in the cavity 1011a, and is disposed on the side wall of the cavity 1011a. In this way, the working end 1021 of the stator 102 and the permanent magnet 1012 are disposed opposite to each other to form a mating relationship. Figure 3As shown, in this embodiment, the upper surface of the mounting seat 104 is provided with a mounting groove 1045 for mounting the positioning end 1022 of the stator 102. Figure 3 As shown, the outer wall of the positioning end 1022 of the stator 102 abuts against the side wall of the mounting groove 1045 .

[0043] Certainly, in the present embodiment, the mounting base 104 is also provided with a pump cavity (not shown) for installing the internal and external gears for realizing the pumping action. Moreover, in the present embodiment, the control portion can also be provided as in the first embodiment.

[0044] In this embodiment, because the positioning end 1022 of the stator 102 abuts the metal mounting seat 104 (i.e., the stator outer wall abuts the sidewall of the mounting slot on the mounting seat), the metal material forms a contact connection, ensuring the dimensional accuracy of the metal material and making it less susceptible to deformation during use. Therefore, the abutment and positioning of the mounting seat 104 against the stator 102 resolves the aforementioned problems of the prior art, ensuring good concentricity between the stator 102 and the rotor 101 and a high precision of the magnetic circuit air gap, thereby improving the performance of the electric motor oil pump.

[0045] In addition, although the rotor 101 is located at the upper end portion of the rotating shaft 103 in this embodiment, the rotor 101 may be provided at another position of the rotating shaft 103 .

[0046] Although the permanent magnet 1012 is disposed on the inner wall of the rotating body 1011 in this embodiment, the position of the permanent magnet 1012 on the rotating body 1011 is not limited to the inner wall. In addition, the rotating body 1011 itself may be a permanent magnet.

[0047] As can be seen from the above, the key to the present invention lies in the structure and positioning between the rotor and the stator. As for the structure of the control portion 2 mentioned above and its coordination with the mechanical portion 1, which is the focus of protection in the present invention, as long as it is reasonable and achievable, the above-mentioned embodiment of the control portion 2 does not limit the present invention. Of course, the various structures and positional relationships in the mechanical portion 1 are also not intended to limit the present invention. The above-mentioned embodiment is merely an example. In the present invention, as long as the stator and rotor can be reliably positioned by abutting the stator's positioning portion with the mounting seat portion, thereby ensuring the accuracy of concentricity and magnetic circuit air gap, it will be sufficient.

[0048] According to the above-mentioned electric motor oil pump setting of the present invention, the problem of low motor efficiency caused by large deviation of the motor magnetic circuit air gap of the electric motor oil pump is solved. The present invention uses the stator diameter of the motor magnetic circuit air gap of the electric motor oil pump as a reference, and uses a mounting seat to position the rotating shaft of the rotor, thereby achieving precise positioning of the rotor, ensuring the accuracy of the magnetic circuit air gap between the rotor and the stator in the inner rotor mode and the outer rotor mode, so that the concentricity of the stator and the rotor is good, thereby improving the performance of the electric motor oil pump.

[0049] From the above, it can be seen that the present invention aims to provide a method that can ensure high precision of the magnetic circuit air gap between the rotor and the stator in the inner rotor mode and the outer rotor mode of the electric motor oil pump, so that the concentricity between the stator and the rotor is high. This solves the problem of poor concentricity between the rotor and the stator caused by large cumulative errors, poor material positioning and application restrictions in the prior art, so that the electric motor oil pump of the present invention has better performance and longer service life.

[0050] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail, it should be understood that they can be implemented by adopting general devices and methods available in the art.

[0051] The above description is merely one embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An electric motor oil pump, comprising: A mechanical part (1) and a control part (2) connected to the mechanical part (1), characterized in that the mechanical part (1) includes a rotor (101), a stator (102) matched with the rotor (101), a rotating shaft (103) connected to the rotor (101), a mounting seat (104) for supporting the rotating shaft (103), and a base (105) for supporting the mounting seat (104); The stator (102) includes a working end (1021) and a positioning end (1022); The working end (1021) is arranged opposite to the rotor (101); The positioning end (1022) abuts against the mounting seat (104) to achieve precise positioning of the rotor (101); The rotor (101) includes a rotating body (1011) supported on the rotating shaft (103) and a permanent magnet (1012) arranged on the rotating body (1011); The rotating body (1011) is arranged at the end of the rotating shaft (103); A concave cavity (1011a) is provided at one end of the rotating body (1011) facing the mounting seat (104); The mounting seat (104) is a stepped sleeve structure, wherein the first step (1041) of the mounting seat (104) is supported on the base (105), the outer wall of the second step (1042) abuts against the inner wall of the positioning end (1022), and the third step (1043) extends into the concave cavity (1011a).

2. The electric motor oil pump according to claim 1, characterized in that The mounting seat (104) and / or the base (105) is provided with a pump cavity (1044) for mounting internal and external gears for achieving a pumping effect.

3. The electric motor oil pump according to claim 1, wherein: The control part (2) comprises an end cover (201) having an inner cavity, a circuit board (202) located in the inner cavity of the end cover (201), and an electrical connection port (203) for connecting to an external power source and arranged on the outer wall of the end cover (201).

4. The electric motor oil pump according to claim 2, characterized in that The mounting seat (104) is provided with an oil inlet and an oil outlet or The base (105) is provided with an oil inlet and an oil outlet or The mounting seat (104) and the base (105) are respectively provided with an oil inlet and an oil outlet.

5. The electric motor oil pump according to claim 1, characterized in that The permanent magnet (1012) is provided on the outer wall of the rotating body (1011) and is opposite to the working end (1021) of the stator (102).

6. An electric motor oil pump comprising: A mechanical part (1) and a control part (2) connected to the mechanical part (1), characterized in that the mechanical part (1) includes a rotor (101), a stator (102) matched with the rotor (101), a rotating shaft (103) connected to the rotor (101), a mounting seat (104) for supporting the rotating shaft (103), and a base (105) for supporting the mounting seat (104); The stator (102) includes a working end (1021) and a positioning end (1022); The working end (1021) is arranged opposite to the rotor (101); The positioning end (1022) abuts against the mounting seat (104) to achieve precise positioning of the rotor (101); The rotor (101) includes a rotating body (1011) supported on the rotating shaft (103) and a permanent magnet (1012) arranged on the rotating body (1011); The rotating body (1011) is arranged at the end of the rotating shaft (103); a chamber (1011a) is provided at one end of the rotating body (1011) facing the mounting seat (104); a working end (1021) of the stator (102) is located in the chamber (1011a); and the permanent magnet (1012) is arranged on a side wall of the chamber (1011a) of the rotating body (1011) opposite to the working end (1021); The mounting seat (104) has a mounting groove (1045) for mounting the positioning end (1022) of the stator (102), and the outer wall of the positioning end (1022) abuts against the side wall of the mounting groove (1045).

7. The electric motor oil pump according to claim 6, characterized in that The mounting seat (104) and / or the base (105) is provided with a pump cavity (1044) for mounting internal and external gears for achieving a pumping effect.

8. The electric motor oil pump according to claim 7, characterized in that The mounting seat (104) is provided with an oil inlet and an oil outlet or The base (105) is provided with an oil inlet and an oil outlet or The mounting seat (104) and the base (105) are respectively provided with an oil inlet and an oil outlet.

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