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 the bearing plate; the bearing plate is assembled on the first surface of the control circuit board; the connector and lead frame assembly is assembled on the second surface of the control circuit board in a planar layout mode, and the interface orientation of the connector is opposite to that of the motor; wherein the connector and the lead frame assembly are provided with assembling holes, bushings are embedded in the assembling holes, and the connector and the lead frame assembly are assembled through fasteners which penetrate through the bushings and the control circuit board and are fastened to the bearing plate. The electronic power-assisted unit is reasonable and compact in layout, the size of the electronic power-assisted unit can be reduced so that the electronic power-assisted unit can be assembled in various vehicle models, the connector and the lead frame assembly can be firmly assembled with the control circuit board and the bearing plate, and the stability of the whole structure of the electronic power-assisted unit is ensured.

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 and consists of a motor, a control circuit board, an interface for connecting power / signal wiring harnesses, a lead frame and other components. The current EPPs usually have the following problems:

[0003] The layout of the interface is unreasonable, which often causes interference with the motor due to insufficient wiring harness access space;

[0004] The loose layout between components makes the entire electronic power steering unit larger in size, which is not conducive to installation in the vehicle, and makes it inconvenient to connect and fix the components, resulting in poor stability of the overall structure of the electronic power steering unit.

[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 utility model, and therefore may include information that does not constitute the 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 have a reasonable and compact layout and solve the problems of the current electronic power-assist unit caused by unreasonable and loose layout.

[0007] One aspect of the utility model provides an electronic power-assist unit, comprising: a motor, mounted on a carrier plate; a control circuit board, the carrier plate being mounted on a first surface of the control circuit board; a connector and a lead frame assembly, mounted on a second surface of the control circuit board in a planar layout, the interface orientation of the connector being opposite to the interface orientation of the motor; wherein the connector and the lead frame assembly are provided with assembly holes, bushings being embedded in the assembly holes, and the connector and the lead frame assembly are assembled respectively by fasteners passing through the bushings and the control circuit board and being fastened to the carrier plate.

[0008] In some embodiments, the bushing is higher than the assembly holes of the connector and the lead frame assembly; the fastener presses the bushing, the control circuit board and the carrier board, and the connector and the lead frame assembly are spaced apart from the second surface of the control circuit board.

[0009] In some embodiments, the bushing is injection molded into the assembly holes of the connector and the lead frame assembly.

[0010] In some embodiments, the control circuit board is grounded via the bushing and the fastener.

[0011] In some embodiments, the connector is provided with a support column for cooperating with the second surface of the control circuit board; the connector and the lead frame assembly are also provided with pins for electrically connecting with the control circuit board.

[0012] In some embodiments, a setting area of ​​the lead frame assembly on the control circuit board corresponds to a setting area of ​​the motor on the control circuit board; and an interface center line of the connector is parallel to an axis of the motor.

[0013] In some embodiments, the lead frame assembly includes a lead frame and an inductor integrated on the lead frame; the lead frame is provided with an inductor limiting structure and a wiring harness limiting structure, and the body and wiring harness of the inductor are respectively limited by the inductor limiting structure and the wiring harness limiting structure.

[0014] In some embodiments, the inductor limiting structure includes a plurality of limiting plates, and ports of the limiting plates form a pressure head for limiting the movement of the body of the inductor.

[0015] In some embodiments, the harness limiting structure includes a plurality of groups of limiting ribs, and ports of each group of the limiting ribs form chamfers for guiding the harness of the inductor to be inserted.

[0016] In some embodiments, the electronic power-assist unit further includes: a cover plate, which is disposed on the connector and the lead frame assembly, and the cover plate is provided with a through hole for the interface of the connector to pass through and a cavity for accommodating the lead frame assembly; wherein, the inner wall of the cover plate and the outer wall of the connector and the lead frame assembly are provided with matching snap-fit ​​parts, and the cover plate is snap-fitted with the connector and the lead frame assembly through the snap-fit ​​parts.

[0017] In some embodiments, a step is provided on the edge of the connector, and the edge of the through hole of the cover plate is pressed against the step and is sealed and connected to the step through a sealant covering the step.

[0018] In some embodiments, a U-shaped groove is provided at the edge of the carrier plate, and the edge of the cover plate is inserted into the U-shaped groove and is sealed and connected to the edge of the carrier plate via a sealant covering the U-shaped groove.

[0019] In some embodiments, the inner side wall of the cover plate is further provided with guide ribs for guiding the assembly of the cover plate.

[0020] 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.

[0021] Compared with the prior art, the beneficial effects of the present invention include at least:

[0022] The electronic power-assist unit of the utility model arranges the motor and the connector on two opposite sides of the control circuit board, so that the interface of the connector is oriented opposite to the interface of the motor to avoid interference, leaving more space for the wiring harness connection of the connector; the connector and the lead frame assembly are assembled on the control circuit board in a planar layout to form a compact structural design, avoiding space waste caused by a three-dimensional layout, and can better utilize the space, which helps to reduce the volume of the entire electronic power-assist unit, thereby facilitating the electronic power-assist unit to be assembled into various large and small vehicles; bushings are embedded in the assembly holes of the connector and the lead frame assembly, and cooperate with fasteners that pass through the bushing and the control circuit board and are fastened to the carrier board to realize the fastened assembly of the connector and the lead frame assembly with the control circuit board and the carrier board, thereby ensuring the stability of the overall structure of the electronic power-assist unit.

[0023] The electric power steering system equipped with the electronic power unit of the utility model can achieve a reasonable and compact layout with the help of the electronic power unit, reduce the volume of the electric power steering system, and facilitate assembly into various large and small vehicles, and can achieve fastening assembly between components to ensure the stability of the overall structure of the electric power steering system.

[0024] 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

[0025] 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.

[0026] Figure 1 A schematic diagram showing the assembly structure of the electronic power-assist unit in an embodiment of the utility model is shown;

[0027] Figure 2 A schematic diagram of the explosion structure of the electronic power-assist unit in the embodiment of the utility model is shown;

[0028] Figure 3 A schematic diagram showing the structure of a connector in an embodiment of the utility model is shown;

[0029] Figure 4 A schematic diagram showing the structure of the lead frame assembly assembled on a circuit board in an embodiment of the utility model is shown;

[0030] Figure 5 A schematic diagram showing the structure of the connector / lead frame assembly and the circuit board in the embodiment of the utility model is shown;

[0031] Figure 6 A schematic diagram showing the structure of a lead frame in an embodiment of the utility model is shown;

[0032] Figure 7 A schematic diagram showing an inductor limiting structure and a wiring harness limiting structure of a lead frame in an embodiment of the utility model;

[0033] Figure 8 A schematic diagram showing the structure of the cover plate in an embodiment of the utility model is shown;

[0034] Fig. 9 A schematic diagram showing the structure of the side wall of the cover plate and the connector / lead frame assembly assembled in an embodiment of the utility model;

[0035] Fig.10 A schematic diagram showing the structure of the assembly of the through hole of the cover plate and the connector in the embodiment of the utility model;

[0036] Fig.11 A schematic structural diagram showing the assembly of the edge of the cover plate and the bearing 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 "upper" and "lower" etc. 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, 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 in figure. Figure 3 The structure of the connector is shown in figure. Figure 4 The structure of the lead frame assembly is shown schematically. Figure 5 The structure of the connector / lead frame assembly assembled with the circuit board is shown; Figures 1 to 5 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;

[0042] The control circuit board 30, the carrier board 20 is mounted on the first surface of the control circuit board 30 (with Figure 1 and Figure 2 , that is, the carrier board 20 is mounted on the lower surface of the control circuit board 30);

[0043] The connector 40 and the lead frame assembly 50 are assembled on the second surface (with Figure 1 and Figure 2 , that is, the connector 40 and the lead frame assembly 50 are assembled on the upper surface of the control circuit board 30), and the interface 44 of the connector 40 faces the opposite direction to the interface 11 of the motor 10;

[0044] The connector 40 and the lead frame assembly 50 are provided with an assembly hole A, in which a bushing A1 is embedded. The connector 40 and the lead frame assembly 50 are assembled by fasteners A2 that pass through the bushing A1 and the control circuit board 30 and are fastened to the carrier board 20 .

[0045] In the electronic power-assist unit of the present invention, the motor 10 and the connector 40 are arranged on opposite sides of the control circuit board 30, so that the interface 44 of the connector 40 faces opposite to the interface 11 of the motor 10 to avoid interference, leaving more space for the wiring harness connection of the connector 40; the connector 40 and the lead frame assembly 50 are assembled on the control circuit board 30 in a planar layout to form a compact structural design, avoid space waste caused by a three-dimensional layout, and can better utilize the space, which helps to reduce the volume of the entire electronic power-assist unit, thereby facilitating the electronic power-assist unit to be assembled into various large and small vehicles; a bushing A1 is embedded in the assembly hole A of the connector 40 and the lead frame assembly 50, and cooperates with the fastener A2 that passes through the bushing A1 and the control circuit board 30 and is fastened to the carrier plate 20 to achieve the fastening assembly of the connector 40 and the lead frame assembly 50 with the control circuit board 30 and the carrier plate 20, thereby ensuring the stability of the overall structure of the electronic power-assist unit.

[0046] The control circuit board 30 may be a PCBA (Printed Circuit Board Assembly), but is not limited thereto.

[0047] In some embodiments, the bushing A1 is higher than the assembly hole A of the connector 40 and the lead frame assembly 50; the fastener A2 presses the bushing A1, the control circuit board 30 and the carrier board 20, and the connector 40 and the lead frame assembly 50 are spaced apart from the second surface of the control circuit board 30.

[0048] The bushing A1 is higher than the assembly hole A, so that the fastener A2 presses the bushing A1, the control circuit board 30 and the carrier board 20 to achieve a stable assembly of the three. At the same time, the connector 40 and the lead frame assembly 50 are spaced from the control circuit board 30 to leave space for the layout of the electronic components on the second surface of the control circuit board 30. The gap H between the connector 40 / lead frame assembly 50 and the second surface of the control circuit board 30 can be determined as needed to facilitate the arrangement of electronic components.

[0049] In some embodiments, the bushing A1 is injection molded in the assembly hole A of the connector 40 and the lead frame assembly 50 .

[0050] By injection molding, the bushing A1 is firmly embedded in the assembly hole A. In other implementations, the bushing A1 may also be embedded in the assembly hole A of the connector 40 and the lead frame assembly 50 by other suitable methods (such as interference fit).

[0051] In some embodiments, the control circuit board 30 is grounded via the bushing A1 and the fastener A2 .

[0052] A grounding path of the control circuit board 30 is formed by the bushing A1 and the fastener A2 , which facilitates the grounding of the control circuit board 30 .

[0053] In some embodiments, the connector 40 is provided with a support column 42 for mating with the second surface of the control circuit board 30 ; the connector 40 and the lead frame assembly 50 are also provided with a pin B for electrically connecting with the control circuit board 30 .

[0054] The connector 40 is stably supported on the control circuit board 30 by the support column 42 to prevent the connector 40 from shaking when the wiring harness is connected; the electrical connection between the connector 40 and the lead frame assembly 50 and the control circuit board 30 is achieved through the pin B.

[0055] In some embodiments, the area where the lead frame assembly 50 is disposed on the control circuit board 30 corresponds to the area where the motor 10 is disposed on the control circuit board 30 ; and the center line of the interface 44 of the connector 40 is parallel to the axis Z of the motor 10 .

[0056] The lead frame assembly 50 is arranged corresponding to the motor 10, and the center line of the interface 44 of the connector 40 is parallel to the axis Z of the motor 10, so as to realize the planar layout of the connector 40 and the lead frame assembly 50 on the circuit board, reasonably utilize the surface space of the circuit board, and make the overall structure of the electronic power unit stable.

[0057] Figure 6 The structure of the lead frame of the lead frame assembly is schematically shown. Figure 7 The inductor limiting structure and harness limiting structure of the lead frame are schematically shown; combined with Figures 1 to 7 As shown, in some embodiments, the lead frame assembly 50 includes a lead frame 52 and an inductor 53 integrated on the lead frame 52; an inductor limiting structure 531 and a wiring harness limiting structure 532 are provided on the lead frame 52, and the body and the wiring harness of the inductor 53 are respectively limited by the inductor limiting structure 531 and the wiring harness limiting structure 532.

[0058] The inductor 53 is assembled integrally with the lead frame 52 to achieve module integration, which is beneficial to reducing the volume of the electronic power unit and the number of components; through the inductor limiting structure 531 and the wiring harness limiting structure 532, the body of the inductor 53 and the wiring harness are firmly assembled on the lead frame 52.

[0059] In some embodiments, the inductor limiting structure 531 includes a plurality of limiting plates, and ports of the limiting plates form a pressure head 5310 for limiting the movement of the body of the inductor 53 .

[0060] The body of the inductor 53 can be clamped by a limiting plate to prevent displacement; the port of the limiting plate forms a pressing head 5310 for firmly limiting the body of the inductor 53 on the lead frame 52 .

[0061] In some embodiments, the wire harness limiting structure 532 includes a plurality of groups of limiting ribs, and the ports of each group of limiting ribs form chamfers 5320 for guiding the wire harness of the inductor 53 to be inserted.

[0062] The wiring harness of the inductor 53 can be caught by the limiting rib to avoid displacement; the end of the limiting rib forms a chamfer 5320 to facilitate the pressing of the wiring harness of the inductor 53.

[0063] Figure 8 The structure of the cover is shown in FIG. Fig. 9 The structure of the side wall of the cover plate and the connector / lead frame assembly is shown; Figures 1 to 9 As shown, in some embodiments, the electronic power assist unit further includes:

[0064] A cover plate 60 is provided on the connector 40 and the lead frame assembly 50, and the cover plate 60 is provided with a through hole 62 for the interface 44 of the connector 40 to pass through and a cavity 63 for accommodating the lead frame assembly 50;

[0065] The inner wall of the cover plate 60 and the outer walls of the connector 40 and the lead frame assembly 50 are provided with matching snap-fit ​​components C, and the cover plate 60 is snap-fitted with the connector 40 and the lead frame assembly 50 via the snap-fit ​​components C.

[0066] The cover plate 60 is disposed on the connector 40 and the lead frame assembly 50, accommodating the lead frame assembly 50 therein for protection and allowing the interface 44 of the connector 40 to extend therethrough for wiring; the cover plate 60 is stably fastened to the connector 40 and the lead frame assembly 50 through the latching members C disposed on the inner wall of the cover plate 60 and the outer walls of the connector 40 and the lead frame assembly 50.

[0067] Fig.10 The structure of the through hole of the cover plate and the connector is shown; Figures 1 to 10 As shown, in some embodiments, a step 48 is provided on the edge of the connector 40 , and the through hole edge 620 of the cover plate 60 is pressed against the step 48 and sealed to the step 48 by a sealant D1 covering the step 48 .

[0068] Through the step 48, the edge 620 of the through hole of the cover plate 60 and the edge of the connector 40 are stably pressed together; during assembly, a sealant D1 can be applied on the step 48, and during the process of pressing the edge 620 of the through hole of the cover plate 60 and the step 48, the sealant D1 covers the step 48 and is pressed between the edge 620 of the through hole of the cover plate 60 and the edge of the connector 40, thereby achieving a sealed connection. The step 48 is, for example, L-shaped, but not limited thereto.

[0069] Fig.11 The structure of the edge of the cover plate and the bearing plate is shown; Figures 1 to 11As shown, in some embodiments, a U-shaped groove 22 is provided at the edge of the carrier plate 20 , and the edge 600 of the cover plate 60 is inserted into the U-shaped groove 22 and is sealed to the edge of the carrier plate 20 by a sealant D2 covering the U-shaped groove 22 .

[0070] The edge 600 of the cover plate 60 and the edge of the carrier plate 20 are stably embedded through the U-shaped groove 22; during assembly, sealant D2 can be applied in the U-shaped groove 22. During the process of pressing the edge 600 of the cover plate 60 and the edge of the carrier plate 20, the sealant D2 covers the U-shaped groove 22 and is pressed between the edge 600 of the cover plate 60 and the edge of the carrier plate 20 to achieve a sealed connection.

[0071] In some embodiments, the inner side wall of the cover plate 60 is further provided with guide ribs 66 for guiding the assembly of the cover plate 60. The guide ribs 66 make the assembly process of the cover plate 60 stable and smooth.

[0072] An embodiment of the utility model further provides an electric power steering system, which is equipped with an electronic power steering unit as described in any of the above embodiments.

[0073] The electric power steering system of the utility model is equipped with the above-mentioned electronic power-assisting unit, which can achieve a reasonable and compact layout, reduce the volume of the electric power steering system, so as to facilitate its assembly into various large and small vehicles, and can achieve fastening assembly between components to ensure the stability of the overall structure of the electric power steering system.

[0074] 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: A motor, mounted on the carrier plate; A control circuit board, wherein the carrier board is mounted on a first surface of the control circuit board; A connector and a lead frame assembly are assembled on the second surface of the control circuit board in a planar layout, and the interface orientation of the connector is opposite to the interface orientation of the motor; The connector and the lead frame assembly are provided with assembly holes, bushings are embedded in the assembly holes, and the connector and the lead frame assembly are assembled by fasteners passing through the bushings and the control circuit board and fastened to the carrier board.

2. The electronic power assist unit according to claim 1, characterized in that: The bushing is higher than the assembly holes of the connector and the lead frame assembly; The fastener compresses the bushing, the control circuit board and the carrier board, and the connector and the lead frame assembly are spaced apart from the second surface of the control circuit board.

3. The electronic power assist unit according to claim 1, characterized in that: The bushing is injection molded in the assembly holes of the connector and the lead frame assembly.

4. The electronic power assist unit according to claim 1, characterized in that: The control circuit board is grounded via the bushing and the fastener.

5. The electronic power assist unit according to claim 1, characterized in that: The connector is provided with a support column for cooperating with the second surface of the control circuit board; The connector and the lead frame assembly are also provided with pins for electrically connecting to the control circuit board.

6. The electronic power-assist unit according to claim 1, characterized in that: The arrangement area of ​​the lead frame assembly on the control circuit board corresponds to the arrangement area of ​​the motor on the control circuit board; The interface center line of the connector is parallel to the axis of the motor.

7. The electronic power-assist unit according to claim 1, characterized in that: The lead frame assembly includes a lead frame and an inductor integrally assembled on the lead frame; The lead frame is provided with an inductor limiting structure and a wiring harness limiting structure, and the body of the inductor and the wiring harness are respectively limited by the inductor limiting structure and the wiring harness limiting structure.

8. The electronic power-assist unit according to claim 7, characterized in that: The inductor limiting structure includes a plurality of limiting plates, and ports of the limiting plates form pressure heads for limiting the movement of the body of the inductor.

9. The electronic power-assist unit according to claim 7, characterized in that: The harness limiting structure comprises a plurality of groups of limiting ribs, and the ports of each group of the limiting ribs form chamfers for guiding the harness of the inductor to be inserted.

10. The electronic power assist unit according to claim 1, characterized in that: Also includes: A cover plate, which is disposed on the connector and the lead frame assembly, and the cover plate is provided with a through hole for the interface of the connector to pass through and a cavity for accommodating the lead frame assembly; The inner side wall of the cover plate, and the outer side walls of the connector and the lead frame assembly are provided with matching snap fasteners, and the cover plate, the connector and the lead frame assembly are snapped together through the snap fasteners.

11. The electronic power-assist unit according to claim 10, characterized in that: The edge of the connector is provided with a step, the edge of the through hole of the cover plate is pressed against the step, and is sealed and connected to the step through a sealant covering the step.

12. The electronic power-assist unit according to claim 10, characterized in that: The edge of the supporting plate is provided with a U-shaped groove, the edge of the cover plate is inserted into the U-shaped groove, and is sealed and connected to the edge of the supporting plate through the sealant covering the U-shaped groove.

13. The electronic power-assist unit according to claim 10, characterized in that: The inner side wall of the cover plate is also provided with guide ribs for guiding the assembly of the cover plate.

14. An electric power steering system, characterized in that: The electronic power-assist unit is provided as claimed in any one of claims 1 to 13.

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