Vane pump rotor assembly and electronic oil pump

Abstract

The invention relates to a vane pump rotor assembly comprising a pump rotor and a magnet ring arranged around the periphery of the pump rotor, the pump rotor being provided with a plurality of vane grooves spaced apart from each other in the circumferential direction, each vane groove receiving a vane, the first end face of the vane being located in the vane groove, and the second end face of the vane being located in the vane groove. The second end face of the blade abuts against the radial inner surface of the magnetic ring, the blade groove comprises a first part section and a second part section, the blade part located on the first part section makes contact with the groove wall, and the blade part located on the second part section does not make contact with the groove wall; the blade grooves are designed such that a portion of the blade is always in the second section during the entire extension or retraction stroke of the blade. The invention further relates to an electronic oil pump comprising the vane pump rotor assembly. By the adoption of the vane pump rotor assembly, friction between the vanes and the vane grooves can be reduced to the maximum extent, so that the motion resistance of the vanes is reduced, and various risks caused by vane clamping stagnation are reduced.

Description

Technical Field

[0001] The present invention relates to the field of pumping devices, in particular to a vane pump rotor assembly and an electronic oil pump comprising the vane pump rotor assembly. Background Art

[0002] In the automotive field, an electronic oil pump system is often provided in the gearbox. The electronic oil pump generally includes a pump head and a motor as a power part, wherein the pump head includes a vane pump rotor assembly. The vane pump rotor assembly drives its pump rotor to rotate through the motor to convert the sucked low-pressure oil into high-pressure oil and then spray it out, thereby providing lubricating oil and the required pressure for the gearbox.

[0003] It should be known that the pump rotor is usually provided with a plurality of radially recessed blade grooves spaced apart from each other in the circumferential direction, each blade groove containing a blade, which can extend and retract when the pump rotor rotates following the rotor shaft of the motor, thereby realizing the change of oil pressure (converting low oil pressure into high oil pressure). However, the blade groove usually needs to be machined. In order to facilitate its machining, the blade groove of the pump rotor known in the prior art includes two groove walls with a constant width. During operation, the blade portion in the blade groove is always in contact with the groove wall, resulting in a larger contact area between the blade and the groove wall when the blade is extended or retracted relative to the blade groove. When the blade is wide enough along the groove size, due to the influence of machining accuracy and burrs, the movement of the blade is easily stuck, resulting in no oil pressure or low oil pressure, and finally causing the entire oil pump to fail. Summary of the invention

[0004] The present invention is proposed based on such background, and its purpose is to provide an improved vane pump rotor assembly and electronic oil pump structure, so as to overcome one or more of the above-mentioned problems in the prior art.

[0005] According to a first aspect of the present invention, a vane pump rotor assembly is proposed, which comprises: a pump rotor and a magnetic ring arranged around the outer circumference of the pump rotor, the pump rotor being provided with a plurality of vane grooves spaced apart from each other and recessed in the radial direction in the circumferential direction, each vane groove accommodating a vane, the first end face of the vane being located in the vane groove, the second end face of the vane being abutted against the radial inner surface of the magnetic ring, and the vane being able to extend or retract from the vane groove when the vane rotates with the pump rotor, the vane groove comprising a first section and a second section connected to the first section and located radially inward relative to the first section, wherein the vane portion located in the first section contacts the groove wall of the first section, and the vane portion located in the second section does not contact the groove wall of the second section; wherein the vane groove is designed so that during the entire extension or retraction stroke of the vane, there is always a part of the vane located in the second section of the vane groove.

[0006] Advantageously, the second section is in the form of a kidney-shaped trough section.

[0007] Advantageously, the radial inner surface of the magnetic ring is defined with a profile having a cam path, the cam path including two lift profiles defining two oil suction strokes and two drop profiles defining two oil discharge strokes; when the blades follow the rotation of the pump rotor and pass through the lift profile, the blades extend from the corresponding blade slots under the combined action of their own centrifugal force, the end thrust of the oil and the magnetic force of the magnetic ring, and when the blades follow the rotation of the pump rotor and pass through the drop profile, the blades press against the inner surface of the magnetic ring and retract toward the corresponding blade slots.

[0008] According to a second aspect of the present invention, an electronic oil pump is proposed, comprising a pump head and a motor assembled with each other, wherein the pump head comprises a pump housing and a pump chamber defined by the pump housing, and the above-mentioned vane pump rotor assembly is arranged in the pump chamber.

[0009] Advantageously, a pressure plate and a bearing end cover are also arranged in the pump chamber, and the vane pump rotor assembly is arranged between the pressure plate and the bearing end cover to form a pump oil subassembly together with the pressure plate and the bearing end cover.

[0010] Advantageously, the electronic oil pump further comprises a printed circuit board assembly as part of the motor controller, which is arranged adjacent to the oil pump subassembly on a side of the oil pump subassembly away from the motor body; the printed circuit board assembly is fixedly retained on the pump housing of the pump head by means of thermally conductive adhesive.

[0011] Advantageously, the magnetic ring is provided with two positioning holes opposite to each other in the diameter direction, the pressure plate is provided with a first positioning recess aligned with the positioning holes, the bearing end cover is provided with a second positioning recess aligned with the positioning holes, the positioning pin passes through the positioning hole, the first end of the positioning pin extending from the positioning hole is received in the first positioning recess, and the second end of the positioning pin extending from the positioning hole is received in the second positioning recess.

[0012] Advantageously, the pump housing comprises a main body and a central annular supporting wall; the pressure plate comprises a base portion and an annular flange portion extending from the base portion, the annular flange portion being engaged with the annular supporting wall.

[0013] Advantageously, a first sealing ring is provided between the annular flange portion and the annular supporting wall and a second sealing ring is provided between the base and the main body of the pump housing, so that a closed oil outlet cavity is defined by the first sealing ring and the second sealing ring; a third sealing ring is provided between the bearing end cover and the main body of the pump housing to seal the pump oil subassembly relative to the external environment.

[0014] Advantageously, a pair of first recesses and a pair of second recesses are respectively provided on the first end surface of the magnetic ring facing the pressure plate and the second end surface facing the bearing end cover; wherein, a pair of first recessed areas aligned with the pair of first recesses are correspondingly provided on the end surface of the pressure plate facing the magnetic ring, thereby defining a pair of first oil inlets for lubricating oil to enter through the pair of first recesses and the pair of first recessed areas; and a pair of second recessed areas aligned with the pair of second recesses are correspondingly provided on the end surface of the bearing end cover facing the magnetic ring, thereby defining a pair of second oil inlets for lubricating oil to enter through the pair of second recesses and the pair of second recessed areas.

[0015] Compared with the prior art, the vane pump rotor assembly and the electronic oil pump according to the present invention can achieve at least one of the following technical effects: when the blade extends or retracts from the blade slot following the rotation of the pump rotor, there will always be a section of the blade part in the blade slot that is not in contact with the blade slot, thereby greatly reducing the contact area between the blade and the blade slot during movement, reducing the friction between the blade and the slot wall, reducing the movement resistance of the blade, and thus reducing various failure risks caused by blade jamming; by arranging the pump oil sub-assembly between the printed circuit board assembly as part of the motor controller and the motor body, the pump oil sub-assembly can be used to simultaneously achieve effective heat dissipation of the printed circuit board assembly and the motor body, which is more conducive to the lightweight and miniaturized design of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other features and advantages of the present invention will become more readily understood through the following description with reference to the accompanying drawings, in which:

[0017] Figure 1 The structure of the electronic oil pump according to an embodiment of the present invention is shown in a three-dimensional diagram;

[0018] Figure 2 The cross-sectional view shows Figure 1 The structure of the electronic oil pump;

[0019] Figure 3a and Figure 3b The three-dimensional diagram and the cross-sectional diagram respectively show the Figure 1 The oil pump subassembly in the electronic oil pump includes a vane pump rotor assembly and a pressure plate and a bearing end cover respectively arranged on the upper side and the lower side of the vane pump rotor assembly;

[0020] Figure 4 The top view shows the Figure 1 The structure of the vane pump rotor assembly;

[0021] Figure 5 The stereogram shows the Figure 4The structure of the magnetic ring in the vane pump rotor assembly;

[0022] Figure 6 The stereogram shows the Figure 4 The structure of the pump rotor in the vane pump rotor assembly;

[0023] Figure 7a and Figure 7b The structure of the pressure plate is shown in bottom view and perspective view, wherein Figure 7a An end surface of the pressure plate opposite to the vane pump rotor assembly is shown; Figure 7b The other end surface of the pressure plate away from the vane pump rotor assembly is shown; and

[0024] Figure 8 The structure of the bearing end cover is shown in a three-dimensional view, which shows an end surface of the bearing end cover opposite to the vane pump rotor assembly.

[0025] All the drawings are only schematic and not necessarily drawn to scale, and they only show those parts necessary for explaining the present invention, and other parts are omitted or only mentioned. That is, in addition to the parts shown in the drawings, the present invention may also include other parts. DETAILED DESCRIPTION

[0026] In the following description, many specific details are set forth so that those skilled in the art can more fully understand the present invention. However, it is obvious to those skilled in the art that the present invention may be implemented without some of these specific details. The following various aspects, features, embodiments and advantages are for illustrative purposes only and should not be regarded as elements or limitations of the claims unless explicitly stated in the claims. Terms such as "first" and "second" are used hereinafter to describe the elements of the present application, and these terms are only used to distinguish between the various elements without intending to limit the nature, sequence, order or number of these elements. In addition, it should be noted that in this specification, the same and / or functionally identical technical features are marked with the same or similar figures.

[0027] As mentioned in the background technology, in the vane pump rotor assembly of the electronic oil pump known in the prior art, when the blade extends or retracts relative to the blade slot, the blade portion in the blade slot will always be in contact with the slot wall during operation. However, due to the influence of the machining accuracy and burrs of the blade slot, the movement of the blade is easily stuck. This sticking phenomenon needs to be avoided as much as possible to reduce the risk of pump failure.

[0028] In order to avoid or even eliminate the problem of vane sticking existing in the prior art as much as possible, the present invention proposes an improved vane pump rotor assembly, in particular, an improved pump rotor and an electronic oil pump including the vane pump rotor assembly.

[0029] First, see Figure 1-2 , which shows the structure of an electronic oil pump 1 according to an embodiment of the present invention in a stereoscopic view and a cross-sectional view respectively. The electronic oil pump 1 includes a pump head 10 and a motor 20 assembled with each other, wherein the pump head 10 includes a pump housing 110 and a pump chamber defined by the pump housing 110, and a vane pump rotor assembly 120 is arranged in the pump chamber. At the first end side (i.e., Figure 2 A pressure plate 130 is provided on the upper side (shown in FIG. 1 ) and on the second end side (i.e., the upper side) of the vane pump rotor assembly 120. Figure 2 A bearing end cover 140 is provided on the lower side (shown in FIG. 1 ). Figure 3a-3b The oil pump subassembly is shown after the vane pump rotor assembly 120, the pressure plate 130 and the bearing end cover 140 are assembled together to form a pump oil subassembly.

[0030] It should be understood that in the common electronic oil pump structure in the prior art, the printed circuit board assembly of the motor controller is usually arranged at an end side of the motor body away from the pump head (in which the pump oil subassembly is arranged). In order to achieve heat dissipation of the printed circuit board assembly of the motor controller, it is necessary to set a metal cover with a large heat dissipation area outside the printed circuit board assembly, so that the printed circuit board assembly can be effectively dissipated through the metal cover. This will disadvantageously make the entire device bulky and heavy, resulting in higher costs.

[0031] However, the electronic oil pump structure disclosed in the present invention has the following advantageous improvements compared to the structure in the prior art. Figure 2 The printed circuit board assembly 40, which is part of the motor controller, is arranged on the upper side of the pump head 10, that is, the oil pump subassembly is arranged between the printed circuit board assembly 40 and the motor body, so that the oil pumped by the oil pump subassembly can take away the heat of the printed circuit board assembly 40 and the motor 20 at the same time.

[0032] Specifically, the printed circuit board assembly 40 can be fixedly held on the metal pump housing of the pump head by using a heat conductive adhesive. The oil pumped by the pump oil subassembly can firstly achieve heat exchange with the metal pump housing, and then the heat conductive adhesive can be used to dissipate the heat of the printed circuit board assembly 40. This makes it possible to omit the heavy and bulky metal cover in the prior art, and only a plastic cover with a smaller structure size is required. For example, by Figure 1 It can be seen that a plastic cover 30 is buckled on the top of the pump head 10 , and the plastic cover 30 is assembled on the pump housing 110 of the pump head 10 .

[0033] Continue to see Figure 4The vane pump rotor assembly 120 includes a pump rotor 122 and a magnetic ring 121 arranged around the outer circumference of the pump rotor 122. The pump rotor 122 is provided with a plurality of radially recessed vane slots 1222 spaced apart from each other in the circumferential direction. Each vane slot receives a vane 123, the first end face of the vane is in the vane slot, and the second end face of the vane abuts against the radial inner surface of the magnetic ring 121. When the vane 123 rotates following the pump rotor 122, the vane can extend or retract from the vane slot.

[0034] In order to overcome the disadvantages of the solutions known in the prior art that the blade portion in the blade groove is always in contact with the groove wall during operation, the present invention proposes to design the blade groove of the pump rotor to include two sections with different groove widths, namely, a first section with a constant groove width and a second section connected to the first section and located radially inside the first section, wherein the groove width of the second section is different from the groove width of the first section.

[0035] Specifically, see Figure 6 The vane slot 1222 of the pump rotor 122 has a first section 1222a and a second section 1222b. The slot widths of the two sections are designed so that the vane portion in the first section 1222a contacts the slot wall of the first section, and the vane portion in the second section 1222b does not contact the slot wall of the second section. In this way, when the vane extends or retracts from the vane slot following the rotation of the pump rotor, there will always be a part of the vane in the second section 1222b of the vane slot, that is, it does not contact the slot wall of the vane slot, thereby reducing the contact area between the vane and the slot wall during the movement of the vane, which reduces the friction between the vane and the slot wall and reduces the movement resistance of the vane, thereby ensuring the oil pressure and reducing the various failure risks caused by the vane jamming, thereby greatly improving the working stability of the oil pump, and the pump rotor is easy to process.

[0036] See especially Figure 4 , at the two extreme positions of the blade 123, i.e., the maximum extended position and the maximum retracted position, the end surface of the blade closer to the center of the pump rotor (hereinafter referred to as the "first end surface") is located in the second section of the blade slot. Figure 4In the maximum extended position shown at the 6 o'clock and 12 o'clock positions, although the first end face is very close to the notch of the first section 1222a, the first end face of the blade 123 is still in the second section. Therefore, this is sufficient to ensure that the friction with the groove wall is significantly reduced during the entire movement of the blade. As a specific example, the second section 1222b can be in the form of a waist-shaped groove (i.e., semicircular at both ends and rectangular in the middle; or capsule-shaped). Of course, other forms of second sections are also feasible depending on the required working performance and operating parameters of the oil pump, as long as the above-mentioned functions intended to be achieved in this article can be achieved.

[0037] Continue to see Figure 5 , which shows the specific structure of the magnetic ring 121 included in the vane pump rotor assembly 120. The radial inner surface of the magnetic ring 121 is defined with a profile having a cam path 1211, and the cam path 1211 includes two lift profiles defining two oil suction strokes and two drop profiles defining two oil discharge strokes. When the vane 123 follows the rotation of the pump rotor 122 and passes through the lift profile, the vane 123 extends from the corresponding vane slot 1222 under the combined action of its own centrifugal force, the end thrust of the oil, and the magnetic force of the magnetic ring. When the vane 123 follows the rotation of the pump rotor 122 and passes through the drop profile, the vane 123 abuts against the inner surface of the magnetic ring 121 and retracts toward the corresponding vane slot 1222.

[0038] like Figure 5 As shown, the magnetic ring 121 is also provided with two positioning holes 1212 which are opposite to each other in the diameter direction, and the pressure plate 130 is provided with two first positioning recesses 1312 which are respectively aligned with the two positioning holes 1212 (see Figure 7a ), the bearing end cover 140 is provided with two second positioning recesses 142 respectively aligned with the two positioning holes 1212 (see Figure 8 ).Depend on Figure 2 As can be seen in the figure, the positioning pin 124 passes through the positioning hole 1212, the first end of the positioning pin 124 extending from the positioning hole 1212 is received in the first positioning recess 1312, and the second end extending from the positioning hole 1212 is received in the second positioning recess 142. In this way, the vane pump rotor assembly 120 can be held between the pressure plate 130 and the bearing end cover 140, so that the magnetic ring 121 remains fixed, and the pump rotor 122 can rotate relative to the magnetic ring 121 driven by the rotor shaft 21 of the motor 20. Specifically, as Figure 6 As shown, the pump rotor 122 may be provided with a central hole in the form of a spline hole 1221 , and the rotor shaft 21 can be spline-matched with the spline hole 1221 so as to drive the pump rotor 122 to rotate together.

[0039] Back to Figure 2The pump housing 110 includes a main body 111 and a central annular support wall 112. The main body 111 is defined with an oil inlet port 113 for lubricating oil to enter and an oil outlet port 114 for lubricating oil to be discharged (see Figure 1 ). A receiving cavity is defined in the central annular supporting wall 112. The bearing end cover 140 and the pressure plate 130 are each provided with a through center hole, which is aligned with the spline hole 1221 of the pump rotor 122, so as to allow one end of the rotor shaft 21 of the motor 20 to be inserted through the center hole of the bearing end cover 140, the spline hole 1221 of the pump rotor 122 and the center hole of the pressure plate 130 from bottom to top, and finally received in the receiving cavity defined by the annular supporting wall 112 of the pump housing 110. Optionally, a sensor magnet 22 is also provided on the end of the rotor shaft 21 located in the receiving cavity, and the motor controller can use the signal of the sensor magnet 22 to determine the motor information such as the rotation position and speed of the rotor shaft of the motor.

[0040] Continue to see Figure 7a-7b The pressure plate 130 includes a base 131 and an annular flange portion 132 extending from the base 131. The annular flange portion 132 is intended to engage with the annular support wall 112 of the pump housing 110 (see FIG. Figure 2 ).

[0041] A stop shoulder 1321 is formed on the annular flange portion 132 (see Figure 3b , Figure 7b ) and a corresponding stop shoulder 1121 is formed on the annular support wall 112 (see Figure 2 ), so as to allow the first sealing ring 150 to be received in the annular space defined by the two stop shoulders. In addition, a second sealing ring 160 is provided between the base 131 of the pressure plate 130 and the main body 111 of the pump housing 110, so that a high-pressure closed chamber is defined by the first sealing ring 150 and the second sealing ring 160, which can ensure that the oil entering the vane pump rotor assembly can only be discharged from the oil outlet 1313 on the pressure plate (see Figure 7a-7b ) flows out, thereby ensuring that the oil outlet chamber has a predetermined high pressure. The high-pressure sealed chamber is in fluid communication with the oil outlet port 114 of the pump housing 110. Specifically, the second sealing ring 160 is received in an annular space defined by the base 131 of the pressure plate 130 and the annular groove on the main body 111 of the pump housing 110.

[0042] Continue to see Figure 8 , which shows the specific structure of the bearing end cover 140. The bearing end cover 140 is provided with a radially recessed annular recess 143 (at Figure 3bAlso shown in FIG. 1 ), a third sealing ring 170 is arranged in the annular space defined by the annular recess 143 and the main body 111 of the pump housing 110, so that the oil suction chamber is partially defined by the second sealing ring 160 and the third sealing ring 170, as shown in FIG. Figure 3a Advantageously, the third sealing ring 170 can ensure that the oil suction chamber is sealed relative to the external environment, thereby preventing any leakage of the oil entering the oil suction chamber to the outside. The oil suction chamber is in fluid communication with the oil inlet port 113 of the pump housing 110 .

[0043] In order to achieve the introduction of lubricating oil, Figure 3a The pump oil subassembly is defined with a plurality of inlets or free spaces for oil to enter. Figure 5 As shown, a pair of first recesses 1213a and a pair of second recesses 1213b are respectively provided on the first end surface of the magnetic ring 121 facing the pressure plate 130 and the second end surface facing the bearing end cover 140. Figure 7a-7b As shown, a pair of first recessed areas 1311 aligned with the pair of first recessed portions 1213a are correspondingly provided on the end surface of the pressure plate 130 facing the magnetic ring 121, so that a pair of first oil inlets 180 ( Figure 3a Only one is shown); Figure 8 As shown, a pair of second recessed areas 141 aligned with the pair of second recessed portions 1213b are correspondingly provided on the end surface of the bearing end cover 140 facing the magnetic ring 121, so that a pair of second oil inlets 190 ( Figure 3a Only one is shown in the figure). These oil inlets are in fluid communication with the oil inlet ports on the pump housing. Thus, when the pump rotor is driven to rotate by the rotor shaft of the motor, lubricating oil can enter the vane pump rotor assembly through these oil inlets, and by utilizing the relative rotation of the pump rotor and the magnetic ring, the incoming low-pressure oil is converted into high-pressure oil, and sprayed out, for example, into the gearbox, thereby providing effective lubrication for the moving parts in the gearbox.

[0044] It should be known that, by using the vane pump rotor assembly according to the present invention, when the vane extends or retracts from the vane slot following the rotation of the pump rotor, there will always be a portion of the radial length that is not in contact with the slot wall of the vane slot, thereby reducing the contact area between the vane and the vane slot during movement, reducing the friction between the vane and the slot wall, reducing the movement resistance of the vane, and thus reducing the various failure risks caused by the vane jamming. In addition, the electronic oil pump according to the present invention ensures the desired pressure of the oil outlet chamber and the oil suction chamber by providing a three-stage sealing ring between the vane pump rotor assembly, the pressure plate and the bearing end cover. In addition, by arranging the pump oil subassembly between the printed circuit board assembly as part of the motor controller and the motor body, the pump oil subassembly can be used to simultaneously achieve effective heat dissipation of the printed circuit board assembly and the motor body, which is more conducive to the lightweight and miniaturized design of the entire device.

[0045] It should be noted that the embodiments described above are only to be considered as exemplary, and the present invention is not limited to these embodiments. By considering the contents of this specification, those skilled in the art can make various changes and modifications without departing from the scope or spirit of the present invention. The true scope of the present invention is limited by the appended claims and equivalents.

Claims

1. A vane pump rotor assembly, comprising: A pump rotor (122) and a magnetic ring (121) arranged around the outer circumference of the pump rotor, wherein the pump rotor is provided with a plurality of blade grooves (1222) spaced apart from each other and recessed in the radial direction in the circumferential direction, each blade groove receiving a blade (123), the first end surface of the blade being located in the blade groove, the second end surface of the blade being in contact with the radial inner surface of the magnetic ring (121), and when the blade (123) rotates following the pump rotor (122), the blade can extend from or retract into the blade groove, characterized in that The blade groove (1222) includes a first section (1222a) and a second section (1222b) connected to the first section and located radially inward relative to the first section, wherein the blade portion in the first section contacts the groove wall of the first section, and the blade portion in the second section does not contact the groove wall of the second section; wherein the blade groove is designed so that during the entire extension or retraction stroke of the blade, there is always a part of the blade in the second section (1222b) of the blade groove.

2. The vane pump rotor assembly according to claim 1, characterized in that: The second section (1222b) is in the form of a kidney-shaped groove section.

3. The vane pump rotor assembly according to claim 1 or 2, characterized in that: The radial inner surface of the magnetic ring (121) is defined with a profile having a cam path (1211), and the cam path includes two lift profiles defining two oil suction strokes and two drop profiles defining two oil discharge strokes; when the blade follows the rotation of the pump rotor and passes through the lift profile, the blade (123) extends from the corresponding blade groove (1222) under the combined action of its own centrifugal force, the end thrust of the oil and the magnetic force of the magnetic ring; and when the blade follows the rotation of the pump rotor and passes through the drop profile, the blade (123) abuts against the inner surface of the magnetic ring (121) and retracts toward the corresponding blade groove.

4. An electronic oil pump, characterized in that: The electronic oil pump (1) comprises a pump head (10) and a motor (20) assembled with each other, wherein the pump head comprises a pump housing (110) and a pump chamber defined by the pump housing, and a vane pump rotor assembly (120) according to any one of claims 1 to 3 is arranged in the pump chamber.

5. The electronic oil pump according to claim 4, characterized in that: A pressure plate (130) and a bearing end cover (140) are also arranged in the pump chamber, and the vane pump rotor assembly is arranged between the pressure plate and the bearing end cover to form a pump oil subassembly together with the pressure plate and the bearing end cover.

6. The electronic oil pump according to claim 5, characterized in that: The electronic oil pump (1) further comprises a printed circuit board assembly (40) as a part of the motor controller, which is arranged adjacent to the pump oil subassembly on a side of the pump oil subassembly away from the motor body; the printed circuit board assembly (40) is fixedly retained on the pump housing of the pump head by means of heat-conducting glue.

7. The electronic oil pump according to claim 5, characterized in that: The magnetic ring (121) is provided with two positioning holes (1212) opposite to each other in the diameter direction, the pressure plate (130) is provided with a first positioning recess (1312) aligned with the positioning holes, and the bearing end cover (140) is provided with a second positioning recess (142) aligned with the positioning holes. The positioning pin passes through the positioning hole, and the first end of the positioning pin extending from the positioning hole is received in the first positioning recess, and the second end of the positioning pin extending from the positioning hole is received in the second positioning recess.

8. The electronic oil pump according to claim 5, characterized in that: The pump housing (110) includes a main body (111) and a central annular supporting wall (112); the pressure plate (130) includes a base (131) and an annular flange (132) extending from the base, and the annular flange (132) is engaged with the annular supporting wall (112).

9. The electronic oil pump according to claim 8, characterized in that: A first sealing ring (150) is arranged between the annular flange portion (132) and the annular supporting wall (112), and a second sealing ring (160) is arranged between the base (131) and the main body (111) of the pump housing, so that a closed oil outlet cavity is defined by the first sealing ring and the second sealing ring; a third sealing ring (170) is arranged between the bearing end cover (140) and the main body (111) of the pump housing, so that the pump oil subassembly is sealed relative to the external environment.

10. The electronic oil pump according to any one of claims 5 to 9, characterized in that: A pair of first recesses (1213a) and a pair of second recesses (1213a) are respectively arranged on the first end surface of the magnetic ring (121) facing the pressure plate and the second end surface facing the bearing end cover; wherein a pair of first recessed areas (1311) aligned with the pair of first recesses are correspondingly arranged on the end surface of the pressure plate facing the magnetic ring, thereby defining a pair of first oil inlets (180) for lubricating oil to enter through the pair of first recesses and the pair of first recessed areas; and a pair of second recessed areas (141) aligned with the pair of second recesses are correspondingly arranged on the end surface of the bearing end cover facing the magnetic ring, thereby defining a pair of second oil inlets (190) for lubricating oil to enter through the pair of second recesses and the pair of second recessed areas.

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