Electronic power-assisted unit and electric power-assisted steering system

Abstract

The utility model relates to the technical field of electric power-assisted steering, and provides an electronic power-assisted unit and an electric power-assisted steering system. The electronic power assisting unit comprises a motor assembled on a bearing plate, and the bearing plate is assembled on the first surface of the control circuit board; the filtering module, the power connector and the signal connector are assembled on the second surface of the control circuit board, and the power connector and / or the signal connector are / is integrated on a lead frame of the filtering module; the cover body is integrated with a power interface and a signal interface and is connected with the bearing plate in a covering manner, the control circuit board and the filtering module are accommodated in the cover body, the power connector is inserted into the power interface to form a power connection assembly, and the signal connector is inserted into the signal interface to form a signal connection assembly; wherein one or more of the power supply connecting assembly, the signal connecting assembly, the filtering module and the motor connecting assembly adopt a multi-channel redundancy design. The safety level of the electronic power-assisted unit can be improved, meanwhile, the number of components is reduced, component assembly is simplified, and component connection interference is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power steering, in particular to an electronic power unit and an electric power steering system. Background Art

[0002] The Electric Power Pack (EPP) is configured in the Electric Power Steering (EPS) system to analyze steering signals and provide assist torque. Current electronic power packs usually have the following problems:

[0003] The safety level is not high. Most of the functional components such as power access / signal access / power filtering / motor phase line connection adopt single-channel design. Once a failure occurs, the electronic power unit will shut down.

[0004] Some functional components of some electronic power steering units adopt a multi-channel redundant design, but this also brings problems such as an increase in the number of components, complex assembly between components, and easy interference between component connections.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Utility Model Content

[0006] In view of this, the utility model provides an electronic power-assist unit and an electric power-steering system, which can realize a multi-channel redundant design of functional components to improve the safety level of the electronic power-assist unit, while reducing the number of components, simplifying component assembly, and avoiding component connection interference, thereby achieving a stable overall structure and reliable functions of the electronic power-assist unit.

[0007] One aspect of the utility model provides an electronic power-assist unit, comprising: a motor, mounted on a carrier board, the carrier board being mounted on a first surface of a control circuit board; a filter module, a power connector and a signal connector, mounted on a second surface of the control circuit board, and the power connector and / or the signal connector being integrated into a lead frame of the filter module; a cover body integrated with a power interface and a signal interface, which covers the carrier board, the control circuit board and the filter module being accommodated in the cover body, the power connector being inserted into the power interface to form a power connection component, and the signal connector being inserted into the signal interface to form a signal connection component; wherein one or more of the power connection component, the signal connection component, the filter module and the motor connection components adopt a multi-channel redundant design.

[0008] In some embodiments, the power interface / the signal interface has a built-in jack, and the jack has a built-in stamped rib; as the power connector / the signal connector is inserted into the jack and squeezes the stamped rib, the stamped rib is deformed and pressed between the power connector / the signal connector and the jack.

[0009] In some embodiments, a sealant is further provided between the power connector / the signal connector and the jack, and the sealant is in sealing contact with the jack, the stamping rib and the power connector / the signal connector.

[0010] In some embodiments, the power connection assembly includes two groups using a dual-channel redundant design, wherein: the power interface is in a mirrored layout on the cover body, and the power connector is integrated on the lead frame and is in a mirrored layout.

[0011] In some embodiments, the signal connection assembly includes two groups using a dual-channel redundant design, wherein: the signal interface is in a mirror-image layout on the cover body, and the signal connector passes through the assembly hole of the lead frame and is in a mirror-image layout.

[0012] In some embodiments, the filter module includes two inductor modules with a dual-channel redundant design, and the two inductor modules are arranged in a mirror image on the lead frame.

[0013] In some embodiments, the phase-connected components include two groups adopting a dual-channel redundant design, and the two groups of phase-connected components are in a mirrored layout; wherein each group of the phase-connected components includes: a phase connector, which is arranged on the surface of the control circuit board; and a phase conductor, which is arranged on the surface of the carrier board and welded to the phase connector.

[0014] In some embodiments, the phase connector is provided with an arc portion protruding toward the phase conductor, and the phase connector is welded to the phase conductor via the arc portion.

[0015] In some embodiments, the edge of the carrier plate forms a U-shaped groove, the edge of the cover body is inserted into the U-shaped groove, and the U-shaped groove is filled with a sealant that seals and connects the edge of the carrier plate and the edge of the cover body.

[0016] In some embodiments, the side wall of the cover body is provided with a clamping buckle, and the side wall of the supporting plate is provided with a protrusion, and the protrusion extends into the clamping buckle and engages with the clamping buckle.

[0017] In some embodiments, a pressure rib is provided in the clamping buckle, and the protrusion is also pressed tightly against the pressure rib.

[0018] In some embodiments, the cover body is provided with positioning protrusions, and the positioning protrusions are dispersedly arranged on the surface of the non-functional area of ​​the cover body.

[0019] In some embodiments, the carrier plate is provided with an assembly positioning groove for assembling the motor.

[0020] In some embodiments, the port of the motor is provided with: a vent hole covered with a waterproof breathable membrane; a sealing plate, which is sealed with the motor shaft and integrated with the waterproof breathable membrane to form a water drop shape.

[0021] Another aspect of the present invention provides an electric power steering system, wherein the electric power steering system is configured with an electronic power steering unit as described in any of the above embodiments.

[0022] Compared with the prior art, the beneficial effects of the present invention include at least:

[0023] The electronic power-assist unit of the utility model assembles the filter module, power connection assembly, signal connection assembly and other components and the motor on the opposite surfaces of the control circuit board respectively, which can avoid possible interference and leave more space for the wiring harness connection of the power connection assembly, signal connection assembly and other components; the power connector and / or signal connector are integrated on the lead frame of the filter module, and the power interface and signal interface are integrated on the cover body, which can reduce the number of components, realize the integrated design of the components, and simplify the assembly between the components; the cover body is connected to the carrier plate to accommodate and protect the control circuit board, filter module, power connector, signal connector, phase connection components and other components; in addition, the phase connection components of the power connection assembly / signal connection assembly / filter module / motor adopt a multi-channel redundant design to realize redundant protection of functional components, so that the electronic power-assist unit has a higher safety level.

[0024] The electronic power-assist unit and the electric power-steering system of the utility model can realize the multi-channel redundant design of functional components to improve the safety level of the electronic power-assist unit, while reducing the number of components, simplifying component assembly, and avoiding component connection interference, thereby achieving the overall structural stability and reliable function of the electronic power-assist unit and the electric power-steering system.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present utility model, and together with the specification, are used to explain the principles of the present utility model. Obviously, the drawings described below are only some embodiments of the present utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram showing the assembly structure of the electronic power-assist unit in an embodiment of the utility model is shown;

[0028] Figure 2 A schematic diagram of the explosion structure of the electronic power-assist unit in the embodiment of the utility model is shown;

[0029] Figure 3 A schematic diagram showing the structure of the filter module, the power connection component and the signal connection component in the embodiment of the utility model is shown;

[0030] Figure 4 A schematic diagram of the assembly structure of the power connector / signal connector and the power interface / signal interface in an embodiment of the utility model is shown;

[0031] Figure 5 A schematic diagram showing the structure of the filter module in an embodiment of the utility model is shown;

[0032] Figure 6 A schematic diagram showing the structure of the circuit board and the carrier board in the embodiment of the utility model is shown;

[0033] Figure 7 A schematic diagram of the assembly structure of the phase connector and the phase conductor in the embodiment of the utility model is shown;

[0034] Figure 8 A schematic diagram showing the structure of the cover body and the bearing plate in an embodiment of the utility model is shown;

[0035] Fig. 9 A schematic diagram showing the assembly structure of the cover body and the carrying plate in an embodiment of the utility model is shown;

[0036] Fig.10 A schematic structural diagram of a motor and a carrier plate in an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0037] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Instead, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0038] The words "first", "second" and similar words used in the specific description do not indicate any order, quantity or importance, but are only used to distinguish different components. The orientation or positional relationship indicated by the terms "positive" and "negative" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of description, and does 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, it cannot be understood as a limitation on the present utility model. The term "plurality" means two or more, unless otherwise clearly and specifically defined. In addition, in the description of the present utility model, throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of direct connection, but also the case of indirect connection through other elements.

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in different embodiments may be combined with each other.

[0040] Figure 1 The assembly structure of the electronic power-assist unit in the embodiment of the utility model is schematically shown. Figure 2 The explosion structure of the electronic power unit is shown; combined Figure 1 and Figure 2 As shown, the electronic power-assist unit provided by the embodiment of the utility model includes:

[0041] The motor 10 is mounted on a carrier plate 20 , and the carrier plate 20 is mounted on a first surface of a control circuit board 30 ;

[0042] The filter module 40, the power connector 50 and the signal connector 60 are assembled on the second surface of the control circuit board 30, and the power connector 50 and / or the signal connector 60 are integrated into the lead frame 44 of the filter module 40;

[0043] A cover body 70 with integrated power interface 55 and signal interface 66 is connected to the carrier board 20, the control circuit board 30 and the filter module 40 are accommodated in the cover body 70, the power connector 50 is inserted into the power interface 55 to form a power connection assembly, and the signal connector 60 is inserted into the signal interface 66 to form a signal connection assembly;

[0044] Among them, one or more of the power connection component, the signal connection component, the filter module 40 and the phase connection component 11 of the motor 10 adopts a multi-channel redundant design.

[0045] The control circuit board 30 may be a PCBA (Printed Circuit Board Assembly), but is not limited thereto.

[0046] The electronic power assist unit of the utility model assembles the filter module 40, the power connection assembly, the signal connection assembly and other components and the motor 10 on the opposite surfaces of the control circuit board 30 respectively, which can avoid possible interference and leave more space for the wiring harness connection of the power connection assembly, the signal connection assembly and other components; the power connector 50 and / or the signal connector 60 are integrated on the lead frame 44 of the filter module 40, and the power interface 55 and the signal interface 66 are integrated on the cover body 70, which can reduce the number of components, realize the integrated design of the components, and simplify the assembly between the components; the cover body 70 is connected to the carrier plate 20, and the control circuit board 30, the filter module 40, the power connector 50, the signal connector 60, the phase connection assembly 11 and other components are accommodated and protected therein; in addition, one or more functional components such as the power connection assembly / signal connection assembly / filter module 40 / phase connection assembly 11 adopt a multi-channel redundant design to realize redundant protection of the functional components, so that the electronic power assist unit has a higher safety level.

[0047] Therefore, the electronic power assist unit of the utility model can realize the multi-channel redundant design of functional components to improve the safety level of the electronic power assist unit, while reducing the number of components, simplifying component assembly, and avoiding component connection interference, so as to achieve the overall structural stability and reliable function of the electronic power assist unit.

[0048] Figure 3 The structure of the filter module, power connection component and signal connection component is shown in figure. Figure 4 The assembly structure of the power connector / signal connector and the power interface / signal interface is shown; Figures 1 to 4 As shown, in some embodiments, the power interface 55 / signal interface 66 has a built-in jack A, and the jack A has a built-in stamping rib A1; as the power connector 50 / signal connector 60 is inserted into the jack A and the stamping rib A1 is squeezed, the stamping rib A1 is deformed and pressed between the power connector 50 / signal connector 60 and the jack A.

[0049] A stamped rib A1 is built into the socket A of the power interface 55 / signal interface 66. The stamped rib A1 can be deformed under the extrusion force of the power connector 50 / signal connector 60 inserted into the socket A to be pressed between the power connector 50 / signal connector 60 and the socket A, filling the gap between the power connector 50 / signal connector 60 and the socket A, achieving a sealed connection, and preventing impurities such as water vapor and dust from invading the control circuit board 30 through the gap between the power connector 50 / signal connector 60 and the socket A.

[0050] In some embodiments, a sealant A2 is further provided between the power connector 50 / signal connector 60 and the socket A, and the sealant A2 is in sealing contact with the socket A, the stamping rib A1 and the power connector 50 / signal connector 60 .

[0051] The sealed connection between the power connector 50 / signal connector 60 and the socket A is further ensured by the sealant A2 which is in sealing contact with the socket A, the stamping rib A1 and the power connector 50 / signal connector 60 .

[0052] Figure 5 The structure of the filter module is shown; combined Figures 1 to 5 As shown, in some embodiments, the power connection assembly includes two groups using a dual-channel redundant design, wherein: the power interface 55 is arranged in a mirror image on the cover 70, and the power connector 50 is integrated on the lead frame 44 and is arranged in a mirror image.

[0053] The power connection component adopts a dual-channel redundant design to achieve redundant protection of power access and improve the safety level of the power connection component; and the power interface 55 and the power connector 50 are both mirror-imaged, making the structure of the cover body 70 and the lead frame 44 symmetrical and stable, thereby making the overall structure of the electronic power unit symmetrical and stable.

[0054] In some embodiments, the signal connection assembly includes two groups using a dual-channel redundant design, wherein: the signal interface 66 is arranged in a mirror image on the cover 70, and the signal connector 60 passes through the assembly hole 440 of the lead frame 44 and is arranged in a mirror image.

[0055] The signal connection component adopts a dual-channel redundant design to achieve redundant protection of signal access and improve the safety level of the signal connection component; and the signal interface 66 and the signal connector 60 are both in a mirror layout, so that the structure of the cover body 70 and the lead frame 44 is symmetrical and stable, thereby making the overall structure of the electronic power assist unit symmetrical and stable.

[0056] In the above embodiment, the power connector 50 is integrated into the lead frame 44 of the filter module 40 in consideration of both the reduction in the number of components and the simplification of the component structure, while the signal connector 60 is an independent component and needs to be separately assembled to the lead frame 44; in other embodiments, the power connector 50 and the signal connector 60 may also be integrated into the lead frame 44, or the signal connector 60 alone may be integrated into the lead frame 44.

[0057] Further, continue to combine Figures 1 to 5 As shown, in some embodiments, the filter module 40 includes two inductor modules 400 using a dual-channel redundant design, and the two inductor modules 400 are arranged in a mirror image on the lead frame 44 .

[0058] The inductor module 400 adopts a dual-channel redundant design to achieve redundant protection of power supply filtering and improve the safety level of the filter module 40; and the inductor module 400 is in a mirror layout, making the structure of the lead frame 44 symmetrical and stable, thereby making the overall structure of the electronic power unit symmetrical and stable.

[0059] Figure 6The structure of the circuit board and the carrier board is shown schematically. Figure 7 The assembly structure of the phase connector and the phase conductor is shown; Figures 1 to 7 As shown, in some embodiments, the phase connection component 11 includes two groups adopting a dual-channel redundant design, and the two groups of phase connection components 11 are in a mirror layout; wherein each group of phase connection components 11 includes: a phase connector 111, which is arranged on the surface of the control circuit board 30; and a phase conductor 112, which is arranged on the surface of the carrier board 20 and is welded to the phase connector 111.

[0060] The phase connection component 11 adopts a dual-channel redundant design to achieve redundant protection of the phase line connection of the motor 10, thereby improving the safety level of the control of the motor 10; and the phase connection component 11 is in a mirror layout, which is beneficial to improving the symmetry and stability of the overall structure of the electronic power unit.

[0061] In the above-mentioned embodiments, it is exemplified that the power connection component, the signal connection component, the filter module 40 and the phase connection component 11 all adopt a dual-channel redundant design, but the present invention is not limited to this; in other embodiments, according to the configuration requirements of the electronic power-assist unit, the functional components adopting a multi-channel redundant design and the number of redundant channels thereof can be adjusted as needed.

[0062] In some embodiments, the phase connector 111 is provided with an arc portion 1110 protruding toward the phase conductor 112 , and the phase connector 111 is welded to the phase conductor 112 via the arc portion 1110 .

[0063] The arc portion 1110 protruding toward the phase conductor 112 provided on the phase connector 111 can increase the welding area between the phase connector 111 and the phase conductor 112 , thereby facilitating stable welding of the two.

[0064] Figure 8 The structure of the cover and the bearing plate is shown schematically. Fig. 9 The assembly structure of the cover and the bearing plate is shown; Figures 1 to 9 As shown, in some embodiments, the edge of the carrier plate 20 forms a U-shaped groove 22, the edge 72 of the cover 70 is inserted into the U-shaped groove, and the U-shaped groove 22 is filled with a sealant 24 that seals and connects the edge of the carrier plate 20 and the edge 72 of the cover 70.

[0065] The U-shaped groove 22 allows the edge 72 of the cover body 70 to be stably embedded with the edge of the carrier plate 20. During assembly, a sealant 24 can be applied to the U-shaped groove 22, and the edge 72 of the cover body 70 and the edge of the carrier plate 20 are pressed together. During the pressing process, the sealant 24 fills the U-shaped groove 22 and is pressed between the edge 72 of the cover body 70 and the edge of the carrier plate 20 to achieve a sealed connection.

[0066] In some embodiments, a clamping buckle 76 is disposed on the side wall of the cover body 70 , and a protrusion 26 is disposed on the side wall of the carrier plate 20 . The protrusion 26 extends into the clamping buckle 76 and engages with the clamping buckle 76 .

[0067] The protrusion 26 is engaged with the clamping buckle 76 , so that the carrying plate 20 and the cover body 70 are firmly matched to avoid relative movement between the two.

[0068] In some embodiments, a pressure rib 760 is provided in the clamping buckle 76 , and the protrusion 26 is also pressed tightly against the pressure rib 760 .

[0069] By pressing the pressure rib 760 of the clamping buckle 76 against the protrusion 26, the relative limiting effect between the supporting plate 20 and the cover body 70 is further ensured; during assembly, the clamping tool can be used to act on the clamping buckle 76 to press the pressure rib 760 of the clamping buckle 76 against the protrusion 26, so that the supporting plate 20 and the cover body 70 are firmly matched.

[0070] In some embodiments, positioning protrusions 77 are disposed on the cover body 70 , and the positioning protrusions 77 are dispersedly arranged on the surface of the non-functional area of ​​the cover body 70 .

[0071] The positioning protrusions 77 can be used for positioning and applying force to the clamping tool when the cover 70 is assembled to the carrier plate 20; the positioning protrusions 77 are dispersedly arranged on the surface of the non-functional area of ​​the cover 70, so that the clamping tool can apply force to the non-functional area of ​​the cover 70 and stably press the cover 70 onto the carrier plate 20. Among them, the area of ​​the cover 70 where the power interface 55, the signal interface 66, the clamping buckle and other structural components are provided is the functional area, and the area other than the functional area can be used as the non-functional area of ​​the cover 70.

[0072] Fig.10 The structure of the motor and the carrier plate is shown; combined Figures 1 to 10 As shown, in some embodiments, the carrier plate 20 is provided with an assembly positioning groove 28 for assembling the power supply machine 10 .

[0073] The assembly positioning groove 28 can be used for positioning an installation tool when the motor 10 is assembled to the carrier plate 20 , so that the motor 10 can be accurately assembled to the carrier plate 20 using the installation tool.

[0074] In some embodiments, the port of the motor 10 is provided with: a vent hole 15 covered with a waterproof breathable membrane; a sealing plate 16, which is sealed with the motor shaft 18 and integrated with the waterproof breathable membrane to form a water drop shape.

[0075] The waterproof breathable membrane is used to achieve waterproof and breathable ventilation of the vent hole 15, which is beneficial to the heat dissipation and waterproof protection of the motor 10; the sealing plate 16 integrates the sealing function of the waterproof breathable membrane and the motor shaft 18, and realizes the integration and design of the components at the port of the motor 10. The sealing plate 16 and the end face of the motor 10 and the motor shaft 18 can be sealed by a sealing ring.

[0076] An embodiment of the utility model further provides an electric power steering system, wherein the electric power steering system is configured with an electronic power steering unit as described in any of the above embodiments.

[0077] The electric power steering system of the utility model is equipped with the above-mentioned electronic power-assisting unit, which can realize the multi-channel redundant design of functional components to improve the safety level, while reducing the number of components, simplifying component assembly, and avoiding component connection interference, thereby achieving the overall structural stability and reliable function of the electric power steering system.

[0078] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An electronic power unit, characterized in that: include: The motor is mounted on a carrier plate, and the carrier plate is mounted on a first surface of the control circuit board; A filter module, a power connector and a signal connector are assembled on the second surface of the control circuit board, and the power connector and / or the signal connector are integrated into the lead frame of the filter module; A cover body integrated with a power interface and a signal interface is connected to the carrier board, the control circuit board and the filter module are accommodated in the cover body, the power connector is inserted into the power interface to form a power connection component, and the signal connector is inserted into the signal interface to form a signal connection component; Among them, one or more of the power connection component, the signal connection component, the filter module and the phase connection component of the motor adopts a multi-channel redundant design.

2. The electronic power assist unit according to claim 1, characterized in that: The power interface / the signal interface has a built-in jack, and the jack has a built-in stamping rib; As the power connector / the signal connector is inserted into the jack and the stamping rib is squeezed, the stamping rib is deformed and pressed between the power connector / the signal connector and the jack.

3. The electronic power assist unit according to claim 2, characterized in that: A sealant is also provided between the power connector / the signal connector and the jack, and the sealant is in sealing contact with the jack, the stamping rib and the power connector / the signal connector.

4. The electronic power assist unit according to claim 1, characterized in that: The power connection assembly includes two groups of dual-channel redundant designs, wherein: The power interface is arranged in a mirror image on the cover body, and the power connector is integrated on the lead frame and is arranged in a mirror image.

5. The electronic power assist unit according to claim 1, characterized in that: The signal connection assembly includes two groups of dual-channel redundant designs, wherein: The signal interface is arranged in a mirror image on the cover body, and the signal connector passes through the assembly hole of the lead frame and is arranged in a mirror image.

6. The electronic power-assist unit according to claim 1, characterized in that: The filter module includes two inductor modules with dual-channel redundant design, and the two inductor modules are arranged in a mirror image on the lead frame.

7. The electronic power-assist unit according to claim 1, characterized in that: The connected components include two groups of dual-channel redundant design, and the two groups of connected components are in mirror image layout; Wherein, each group of connected components includes: A phase connector, arranged on the surface of the control circuit board; The phase conductor is arranged on the surface of the bearing plate and is welded to the phase connector.

8. The electronic power-assist unit according to claim 7, characterized in that: The phase connector is provided with an arc portion protruding toward the phase conductor, and the phase connector is welded to the phase conductor through the arc portion.

9. The electronic power-assist unit according to claim 1, characterized in that: The edge of the carrier plate forms a U-shaped groove, the edge of the cover body is inserted into the U-shaped groove, and the U-shaped groove is filled with sealant that seals and connects the edge of the carrier plate and the edge of the cover body.

10. The electronic power assist unit according to claim 1, characterized in that: The side wall of the cover body is provided with a clamping buckle, and the side wall of the bearing plate is provided with a protrusion, and the protrusion extends into the clamping buckle and is engaged with the clamping buckle.

11. The electronic power assist unit according to claim 10, characterized in that: The clamping buckle is provided with a pressing rib, and the protrusion is also pressed tightly against the pressing rib.

12. The electronic power assist unit according to claim 1, characterized in that: The cover body is provided with positioning protrusions, and the positioning protrusions are dispersedly arranged on the surface of the non-functional area of ​​the cover body.

13. The electronic power-assist unit according to claim 1, characterized in that: The bearing plate is provided with an assembly positioning groove for assembling the motor.

14. The electronic power-assist unit according to claim 1, characterized in that: The ports of the motor are provided with: Breathable holes, covered with waterproof breathable membrane; The sealing plate is matched with the motor shaft seal and is integrated with the waterproof breathable membrane to form a water drop shape.

15. An electric power steering system, characterized in that: Equipped with an electronic power-assisting unit as described in any one of claims 1-14.

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