Motor mechanism and electric power steering device

Abstract

The invention relates to a motor mechanism and an electric power steering apparatus. The motor mechanism comprises a housing which is internally provided with a first installation cavity and a second installation cavity which are communicated with each other; the motor is contained in the first mounting cavity, a magnet is arranged on the motor, and the magnet is located at the end, facing the second mounting cavity, of the motor; the control assembly is contained in the second mounting cavity and comprises a logic printed circuit board and a power supply printed circuit board which are connected, in the axial direction of the motor, the logic printed circuit board is closer to the magnet than the power supply printed circuit board, and the logic printed circuit board is provided with a motor corner chip and a main chip; the motor corner chip is used for sensing rotation of the magnet and generating a sensing signal, and the sensing signal is transmitted to the main chip through the logic printed circuit board. According to the motor mechanism and the electric power steering device, signal transmission can be more reliable and stable.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle steering, and in particular to a motor mechanism and an electric steering assist device. Background Art

[0002] Autonomous driving has become the focus of future automobile development. In the electric power steering device that integrates a motor mechanism and a control unit, reliably and stably transmitting the angle signal of the motor shaft to the main chip has become a difficult point in controller design.

[0003] In the prior art, after the angle signal of the motor shaft is received by the chip on the power printed circuit board, it is transmitted to the first connector on the power printed circuit board through the circuit of the power printed circuit board, and then transmitted to the second connector on the logic printed circuit board through the soldering interface of the first connector, and finally transmitted to the main chip through the internal circuit of the logic printed circuit board to complete the calculation. However, due to the long signal transmission, it is easily affected by EMI (Electromagnetic Interference) / EMC (Electromagnetic Compatibility), and because it passes through multiple interfaces, the signal may be intermittent or missing due to process problems.

[0004] In order to solve the problem of long transmission paths and too many interfaces, the motor shaft is considered to be extended so that the magnet passes through the power printed circuit board and is close to the chip on the logic printed circuit board, so that the signal can reach the main chip directly. However, since the magnetic field of the magnet will affect the power printed circuit board, the angle signal of the motor shaft is unstable. In addition, it will also affect the transmission of important signals on the power printed circuit board. Summary of the invention

[0005] The present invention provides a motor mechanism and an electric steering assist device, which are used to solve the defects of the motor mechanism and the electric steering assist device in the prior art, such as intermittent, missing or unstable signals, thereby improving the reliability performance of the motor mechanism and the electric steering assist device.

[0006] The present invention provides a motor mechanism, comprising:

[0007] A housing having a first installation cavity and a second installation cavity connected therein;

[0008] a motor, which is accommodated in the first mounting cavity, wherein a magnet is disposed on the motor and the magnet is located at one end of the motor facing the second mounting cavity;

[0009] A control component is housed in the second mounting cavity and includes a logic printed circuit board and a power printed circuit board connected to each other. In the axial direction of the motor, the logic printed circuit board is closer to the magnet than the power printed circuit board. The logic printed circuit board is equipped with a motor angle chip and a main chip. The motor angle chip is used to sense the rotation of the magnet and generate a sensing signal. The sensing signal is transmitted to the main chip through the logic printed circuit board.

[0010] According to an embodiment of the present invention, in the axial direction of the motor, the logic printed circuit board is spaced apart from the power printed circuit board, and the motor mechanism further comprises:

[0011] A support member is sandwiched between the logic printed circuit board and the power printed circuit board to support both the logic printed circuit board and the power printed circuit board.

[0012] According to an embodiment of the present invention, the support member comprises:

[0013] A supporting body, wherein the supporting body is in a plate shape;

[0014] A supporting rib is provided on at least one side surface of the supporting body, and the supporting rib is suitable for contacting the logic printed circuit board and / or the power printed circuit board.

[0015] According to an embodiment of the present invention, a relief portion is provided on the support body, and the relief portion is used to relieve components on the logic printed circuit board and the power printed circuit board, and the relief portion is a recessed structure or a hollow structure.

[0016] According to an embodiment of the present invention, the support member is made of metal.

[0017] According to an embodiment of the present invention, the housing comprises:

[0018] A shell body, which is a one-piece structure, wherein the first installation cavity and the second installation cavity are both located in the shell body, and one side of the shell body has an open opening;

[0019] The cover body is disposed on the shell body to seal the opening.

[0020] According to an embodiment of the present invention, the motor mechanism further comprises:

[0021] A plurality of connectors are spaced apart along the periphery of the cover body, and each connector is used to connect the shell body and the cover body.

[0022] According to an embodiment of the present invention, the cover is provided with a first mounting portion, the power printed circuit board is provided with a second mounting portion, the logic printed circuit board is provided with a third mounting portion, and the shell body is provided with a fourth mounting portion.

[0023] The connecting member is sequentially arranged through the first mounting portion, the second mounting portion, the third mounting portion and the fourth mounting portion.

[0024] According to an embodiment of the present invention, the connecting member is a screw.

[0025] The present invention also provides an electric power steering device, which includes the motor mechanism described in any one of the above embodiments.

[0026] According to the motor mechanism of the embodiment of the present invention, in the axial direction of the motor, the logic printed circuit board is closer to the magnet than the power printed circuit board. As a result, the distance between the magnet and the motor corner chip mounted on the logic printed circuit board is shorter, and the signal transmission between the two is more reliable and stable. At the same time, compared with the prior art, the motor mechanism according to the present invention swaps the positions of the logic printed circuit board and the power printed circuit board, so that the magnet no longer passes through any printed circuit board, thereby avoiding mutual interference between the magnet and the electronic device, thereby improving the reliability performance of the control component. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a perspective view of a motor mechanism according to an embodiment of the present invention;

[0028] Figure 2 is a three-dimensional diagram of a motor mechanism according to an embodiment of the present invention from another perspective;

[0029] Figure 3 is an exploded view of a motor mechanism according to an embodiment of the present invention;

[0030] Figure 4 is an exploded view of a partial structure of a motor mechanism according to an embodiment of the present invention;

[0031] Figure 5 is a front view of a logic printed circuit board of a motor mechanism according to an embodiment of the present invention;

[0032] Figure 6 is a rear view of a logic printed circuit board of a motor mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following detailed description and drawings are used to illustrate the principle of the present invention. The present invention is not limited to the preferred embodiments described. The protection scope of the present invention is defined by the claims.

[0034] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "circumferential" and "axial" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] Combine the following Figure 1-Figure 6 The motor mechanism 100 and the electric power steering assist device according to the embodiment of the present invention are described.

[0036] like Figure 1 and Figure 3 As shown, the motor mechanism 100 according to the embodiment of the present invention includes a housing 110 , a motor 120 , and a control assembly.

[0037] The housing 110 is provided with a first installation cavity and a second installation cavity 113 which are connected to each other. The motor 120 is received in the first installation cavity and is firmly confined in the housing 110. The control component is received in the second installation cavity 113 and is firmly confined in the housing 110.

[0038] like Figure 4 As shown, a magnet 121 is provided on the motor 120. The magnet 121 is located at one end of the motor 120 facing the second mounting cavity 113. The magnet 121 is rigidly connected to the motor shaft of the motor 120, and the magnet 121 rotates with the rotation of the motor shaft.

[0039] like Figure 3 As shown, the control assembly includes a connected logic printed circuit board 130 and a power printed circuit board 140. In the axial direction of the motor 120, the logic printed circuit board 130 is closer to the magnet 121 than the power printed circuit board 140. The logic printed circuit board 130 and the power printed circuit board 140 are fixedly connected to the housing 110 respectively.

[0040] like Figure 5 and Figure 6As shown, the logic printed circuit board 130 is equipped with a motor angle chip 133 and a main chip 132. In the axial direction of the motor 120, the motor angle chip 133 overlaps with the magnet 121. The motor angle chip 133 is used to sense the rotation of the magnet 121 and send a sensing signal. The motor angle chip 133 is connected to the logic printed circuit board 130 for communication, and the logic printed circuit board 130 is connected to the main chip 132 for communication. As a result, the sensing signal sent by the motor angle chip 133 is transmitted to the logic printed circuit board 130, and then transmitted to the main chip 132 through the logic printed circuit board 130. The main chip 132 processes the sensing signal to calculate the rotation angle and rotation speed of the magnet 121, and generates a signal to control the next rotation of the motor 120. The control signal of the main chip 132 is transmitted to the power printed circuit board 140, and the power printed circuit board 140 can transmit the control signal to the motor 120, thereby controlling the rotation of the motor 120 and the magnet 121 thereon.

[0041] According to the motor mechanism 100 of the embodiment of the present invention, in the axial direction of the motor 120, the logic printed circuit board 130 is closer to the magnet than the power printed circuit board 140. Therefore, the distance between the magnet 121 and the motor angle chip 133 mounted on the logic printed circuit board 130 is shorter, and the signal transmission between the two is more reliable and stable. At the same time, compared with the prior art, the motor mechanism 100 according to the present invention swaps the positions of the logic printed circuit board 130 and the power printed circuit board 140, so that the magnet 121 no longer passes through any printed circuit board, thereby avoiding mutual interference between the magnet 121 and the electronic device, thereby improving the reliability performance of the control component.

[0042] In the axial direction of the motor 120, the logic printed circuit board 130 and the power printed circuit board 140 are spaced apart. The logic printed circuit board 130 and the power printed circuit board 140 can be connected by a board-to-board connector. However, only using the board-to-board connector to support and fix the two circuit boards will result in a lack of support and counterweight between the two circuit boards, making it difficult to pass the vibration test specified by the customer. Therefore, in one example, the combination Figure 3 As shown, the motor mechanism 100 may further include a support member 150. The support member 150 is sandwiched between the logic printed circuit board 130 and the power printed circuit board 140 to support both the logic printed circuit board 130 and the power printed circuit board 140, so that the power printed circuit board 140 away from the magnet 121 is well supported and balanced. In this way, the support member 150 can not only maintain the gap between the logic printed circuit board 130 and the power printed circuit board 140, thereby preventing collision and wear between the two, but also solve the problem that the original design is difficult to pass the vibration test when dealing with a redundant system, thereby improving the life and reliability of the product.

[0043] In some examples, the support member 150 is made of a heat dissipation material, such as metal, which can dissipate the heat generated by the logic printed circuit board 130 and the power printed circuit board 140, thereby achieving the purpose of heat dissipation and preventing the electronic devices on the logic printed circuit board 130 and the power printed circuit board 140 from being locally overheated.

[0044] According to some embodiments of the present invention, the support member 150 may include a support body and support ribs 153. The support body may serve as a main force-bearing structure, which may enhance the structural strength of the entire support member 150. In one example, the support body is provided with a through hole for accommodating a board-to-board connector. The support ribs 153 are provided on at least one side of the support body, and the support ribs 153 are suitable for contacting the logic printed circuit board 130 and / or the power printed circuit board 140. The support ribs 153 may serve as force points for supporting the logic printed circuit board 130 and the power printed circuit board 140, thereby improving the support stability.

[0045] In one example, the board directions of the logic PCB 130 and the power PCB 140 are respectively perpendicular to the axial direction of the motor 120. The logic PCB 130 and the power PCB 140 are configured to overlap each other when viewed along the axial direction.

[0046] like Figure 5 As shown, the main chip 132 is mounted on the side surface of the logic printed circuit board 130 facing the magnet 121. In one example, there may be two main chips 132. In the board direction of the logic printed circuit board 130, the motor angle chip 133 may be located between the two main chips 132.

[0047] In some examples, there may be two motor angle chips 133. One motor angle chip 133 is disposed on one side of the logic printed circuit board 130, and the motor angle chip 133 is opposite to the magnet 121. Another motor angle chip 133 is disposed on the other side of the logic printed circuit board 130, and the other motor angle chip 133 is opposite to the power printed circuit board 140.

[0048] In some embodiments of the present invention, it is considered that the logic printed circuit board 130 is provided with a variety of electronic devices, such as the motor angle chip 133, the main chip 132, the board-to-board connector 134, etc., and the power printed circuit board 140 is provided with a variety of electronic devices, such as resistors, capacitors, and voltage regulator tubes. Figure 3As shown, the support body is provided with an avoidance portion 152, which is used to avoid components on the logic printed circuit board 130 and the power printed circuit board 140, such as the motor corner chip 133 and the main chip 132 of the logic printed circuit board 130. The avoidance portion 152 can be a recessed structure or a hollow structure. On the one hand, the recessed structure or the hollow structure can be used to avoid the components, thereby achieving the purpose of saving material usage; on the other hand, the space of the recessed structure or the hollow structure can also be used to provide a flow space for airflow to achieve the purpose of heat dissipation.

[0049] Combination Figure 1 , Figure 2 as well as Figure 3 As shown, according to some embodiments of the present invention, the housing 110 includes a housing body 111 and a cover body 114. One side of the housing body 111 has an open opening, and the cover body 114 is covered on the housing body 111 to seal the open opening. In one example, one side of the housing body 111 close to the second installation cavity 113 has an open opening.

[0050] In one example, the housing of the motor 120 and the housing of the control component can be separately provided. The housing of the motor 120 and the housing of the control component need to be connected with screws, which requires consideration of the strength of the screws and various working conditions in order to avoid screw failure and achieve a dustproof effect. Therefore, in another example, a shell body 111 provided with a first installation cavity for accommodating the motor 120 and a second installation cavity for accommodating the control component is a one-piece structure. It can be understood that compared to a design in which the housing of the motor 120 and the housing of the control component are separated, the housing of the motor 120 and the housing of the control component are integrated into one, that is, the shell body 111 is a one-piece structure, which can reduce the connection interface and improve the dustproof and waterproof performance of the outer shell 110.

[0051] like Figure 3 As shown, according to some embodiments of the present invention, the motor mechanism 100 further includes a plurality of connectors 160, for example, five connectors. The plurality of connectors 160 are spaced apart along the periphery of the cover 114, and each connector 160 is used to connect the shell body 111 and the cover 114. It can be understood that the plurality of connectors 160 fixedly connect the shell body 111 and the cover 114 together, which can not only simplify the assembly process of the shell 110, but also improve the overall stability of the shell 110.

[0052] In some examples, the shell body 111 and the cover body 114 are connected by snaps. However, this snap connection method may cause abnormal noise under vibration conditions due to deformation and creep in the later period of the shell life. To address this problem, in some examples, the shell body 111 and the cover body 114 are connected by screws. The screw structure is simple and has good adaptability. It can be applied to vehicles of different models and can also meet the requirements of vibration tests of different models. In addition, the method of fixing the cover body 114 with screws improves the product's performance in terms of noise.

[0053] According to some embodiments of the present invention, Figure 3 As shown, the cover 114 is provided with a first mounting portion 115, the power printed circuit board 140 is provided with a second mounting portion 141, the logic printed circuit board 130 is provided with a third mounting portion 131, and the shell body 111 is provided with a fourth mounting portion. The connector 160 is sequentially provided through the first mounting portion 115, the second mounting portion 141, the third mounting portion 131 and the fourth mounting portion. In this way, the cover 114, the power printed circuit board 140, the logic printed circuit board 130 and the shell body 111 can be fixed at the same time by the connector 160, thereby simplifying the structure of the motor mechanism 100 and simplifying the assembly process. Of course, when a support member 150 is provided between the power printed circuit board 140 and the logic printed circuit board 130, a fifth mounting portion 154 can be provided on the support member 150. The connector 160 can be sequentially provided through the first mounting portion 115, the second mounting portion 141, the fifth mounting portion 154, the third mounting portion 131 and the fourth mounting portion, thereby using the connector 160 to simultaneously install multiple components together. In some examples, the first mounting portion 115 , the second mounting portion 141 , the fifth mounting portion 154 , the third mounting portion 131 , and the fourth mounting portion may all be through-hole structures.

[0054] The electric power steering device according to the embodiment of the present invention comprises the motor mechanism 100 according to the above embodiment. The electric power steering mechanism is arranged on the steering mechanism of the wheel of the vehicle to reduce the steering force by hydraulic pressure. The electric power steering device comprises a motor mechanism, a steering shaft, an oil pump, a control valve and other known structures, which will not be described in detail here.

[0055] As mentioned above, although the exemplary embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, and the protection scope of the present invention should be defined by the claims and their equivalents.

Claims

1. A motor mechanism (100), comprising: A housing (110) having a first installation cavity and a second installation cavity (113) connected thereto; A motor (120) is accommodated in the first installation cavity, and a magnet (121) is provided on the motor (120), and the magnet (121) is located at one end of the motor (120) facing the second installation cavity (113); A control component is housed in the second mounting cavity (113) and includes a logic printed circuit board (130) and a power printed circuit board (140) connected to each other. In the axial direction of the motor, the logic printed circuit board (130) is closer to the magnet (121) than the power printed circuit board (140). The logic printed circuit board (130) is equipped with a motor angle chip (133) and a main chip (132). The motor angle chip (133) is used to sense the rotation of the magnet and generate a sensing signal. The sensing signal is transmitted to the main chip through the logic printed circuit board (130).

2. The motor mechanism (100) according to claim 1, wherein: In the axial direction of the motor (120), the logic printed circuit board (130) is spaced apart from the power printed circuit board (140), and the motor mechanism (100) further includes: A support member (150) is sandwiched between the logic printed circuit board (130) and the power printed circuit board (140) to support both the logic printed circuit board (130) and the power printed circuit board (140).

3. The motor mechanism (100) according to claim 2, wherein: The support member (150) comprises: A supporting body, wherein the supporting body is in a plate shape; A support rib (153), wherein the support rib (153) is disposed on at least one side surface of the support body, and the support rib (153) is suitable for contacting the logic printed circuit board (130) and / or the power printed circuit board (140).

4. The motor mechanism (100) according to claim 3, wherein: The support body is provided with an avoidance portion (152), the avoidance portion (152) being used to avoid components on the logic printed circuit board (130) and the power printed circuit board (140), and the avoidance portion (152) is a recessed structure or a hollow structure.

5. The motor mechanism (100) according to claim 2, wherein: The support member (150) is made of metal.

6. The motor mechanism (100) according to claim 1, wherein: The housing (110) comprises: A shell body (111) which is a one-piece structure, wherein the first installation cavity and the second installation cavity (113) are both located in the shell body (111), and one side of the shell body (111) has an open opening; A cover body (114) is disposed on the shell body (111) to seal the opening.

7. The motor mechanism (100) according to claim 6, further comprising: A plurality of connecting members (160) are provided, wherein the connecting members (160) are spaced apart along the periphery of the cover body (114), and each connecting member (160) is used to connect the shell body (111) and the cover body (114).

8. The motor mechanism (100) according to claim 7, wherein: The cover body (114) is provided with a first mounting portion (115), the power printed circuit board (140) is provided with a second mounting portion (141), the logic printed circuit board (130) is provided with a third mounting portion (131), and the shell body (111) is provided with a fourth mounting portion. The connecting member (160) is sequentially inserted into the first mounting portion (115), the second mounting portion (141), the third mounting portion (131), and the fourth mounting portion.

9. The motor mechanism (100) according to claim 7 or 8, wherein: The connecting member (160) is a screw.

10. An electric power steering device, comprising: The motor mechanism (100) according to any one of claims 1 to 9.

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