JP2012006419A - Vehicular steering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular steering device which is excellent in durability and prevents adverse influence by a potting material.SOLUTION: A power board 49 is retained by a power-source module 75 having parts connected to a power-source and a resin member 76 retaining the parts. FETs 53 mounted on the power board 49 are embedded in the potting material 91. The resin member 76 includes a main frame 83 surrounding the power board 49 and a reinforcement and partition frame 90 which connects between first and second main frame elements 86, 87 of the main frame 83. The reinforcement and partition frame 90 reinforces the main frame 83 and partitions between a shunt resistor 92 and the potting material 91 on the power board 49.

Description

  The present invention relates to a vehicle steering apparatus.

In a waterproof structure of an electronic unit in which a printed circuit board is protected by waterproofing, a waterproof structure is proposed in which a bank wall portion is provided to prevent the injected potting material from leaking out of the case (see, for example, Patent Document 1). .
In a waterproof casing installed in an engine room of an automobile, a waterproof casing provided with a reinforcing member that prevents deformation of the casing has been proposed (see, for example, Patent Document 2).

JP 2005-160206 A Utility Model Registration No. 2584147

By the way, the electrical components on the circuit board include an electrical component that needs to be embedded in the potting material and an electrical component that causes performance deterioration when the potting material adheres.
In the electric power steering apparatus, the circuit board that controls the electric motor for assisting steering may be affected by stress due to vibration, and durability may be reduced.
The present invention has been made under such a background, and an object of the present invention is to provide a vehicle steering apparatus that has excellent durability and can prevent adverse effects caused by potting materials.

  In order to achieve the above object, the present invention includes a motor control device (12) for controlling an electric motor (18) for generating a steering force, and the motor control device includes components (42, 42) connected to a power source. 80-82) and a power supply module (75; 75A) having a resin member (76; 76A) for holding the same, a circuit board (49) held by the power supply module, and a first mounted on the circuit board. A potting material (91) in which one electrical component (53) is embedded, and the resin member reinforces the main frame and surrounds the main frame (83) and the second on the circuit board. There is provided a vehicle steering system (1) including two electric parts (92) and a reinforcing and partitioning frame (90) for partitioning the potting material.

  In the present invention, deformation of the resin member of the power supply module, in particular, the main frame can be suppressed by the reinforcing and partition frame. Therefore, the stress applied to the electrical components (electronic components) in the circuit board and the power supply module can be remarkably reduced. As a result, the occurrence of cracks in the circuit board due to the stress can be prevented, and the durability can be reduced. Can be improved. In addition, it is possible to reliably prevent the potting material from adhering to the second electric component, thereby reliably preventing adverse effects on the second electric component.

  As the first electric component, a bare chip of a switching element for driving a motor such as a MOSFET can be exemplified. As the second electric component, a shunt resistor used as a current sensor can be exemplified. When a potting material adheres to this type of current sensor, the heat transfer characteristics change, so that the output characteristics of the sensor change, and the present invention prevents such problems from occurring. Can do.

  The main frame connects the first main frame element (86) and the second main frame element (87) facing each other, and the first main frame element and the second main frame element. A third main frame element (88), wherein the reinforcing and partitioning frame connects the first main frame element and the second main frame element, and the first main frame element, A box structure (B) may be formed by the second main frame element, the third main frame element, and the reinforcing / partition frame (claim 2). In this case, deformation of the main frame can be remarkably suppressed by the box structure portion.

The main frame and the reinforcing / partitioning frame may be integrally formed of a single material (claim 3). In this case, the number of parts is not increased in order to realize the functions of the reinforcement and the partition described above. Therefore, the manufacturing cost can be reduced through the reduction of the number of parts and the reduction of assembly man-hours.
Further, the resin member, the first reinforcing frame you connecting between the third main frame element and the reinforcing and partition frame; may include a (93,94 93,94A) (claim 4) . In this case, the effect of suppressing deformation of the main frame can be further increased.

A plurality of the first reinforcing frames may be provided, and the resin member may include a second reinforcing frame (95; 95A) for connecting the plurality of first reinforcing frames (Claim 5). In this case, the effect of suppressing deformation of the main frame can be further increased.
The resin member may include a third reinforcing frame (96, 97) for connecting each first reinforcing frame to a corresponding main frame element (Claim 6). The deformation suppression effect can be increased.

  Further, at least two lengths of the reinforcing frame may be different from each other. In this case, the value of the natural frequency of the reinforcing frame can be dispersed. Therefore, the natural frequency of the resin member as a whole can be prevented from matching the natural frequency of the vibration of the vehicle body or the natural frequency of an electric power steering device, an electric motor, or the like as a vehicle steering device. As a result, generation of vibration noise can be suppressed. In addition, the circuit board can be protected from vibration.

  In addition, in the above, the numbers in parentheses represent reference numerals of corresponding components in the embodiments described later, but the scope of the claims is not limited by these reference numerals.

It is a mimetic diagram showing a schematic structure of an electric power steering device as a vehicle steering device concerning one embodiment of the present invention. It is a schematic perspective view of a steering assist mechanism. It is sectional drawing of a steering assistance mechanism. It is a disassembled perspective view of ECU periphery. It is a schematic plan view of a power board and a power supply module. It is a schematic plan view of the power board and power supply module which concern on another embodiment of this invention.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a schematic diagram showing a schematic configuration of an electric power steering apparatus 1 as a vehicle steering apparatus according to an embodiment of the present invention.
Referring to FIG. 1, an electric power steering device 1 assists steering by a steering wheel 2 as a steering member, a steering mechanism 4 that steers the steered wheels 3 in conjunction with rotation of the steering wheel 2, and a driver. A steering assist mechanism 5 is provided. The steering wheel 2 and the steering mechanism 4 are mechanically connected via a steering shaft 6 and an intermediate shaft 7.

In the present embodiment, a description will be given according to an example in which the steering assist mechanism 5 applies assist force (steering assist force) to the steering shaft 6. However, the present invention can also be applied to a structure in which the steering assist mechanism 5 applies an assist force to a pinion shaft described later, or a structure in which the steering assist mechanism 5 applies an assist force to a rack shaft described later.
The steering shaft 6 includes an input shaft 8 connected to the steering wheel 2 and an output shaft 9 connected to the intermediate shaft 7. The input shaft 8 and the output shaft 9 are connected via a torsion bar 10 so as to be relatively rotatable on the same axis.

  A torque sensor 11 disposed around the steering shaft 6 detects the steering torque input to the steering wheel 2 based on the relative rotational displacement amounts of the input shaft 8 and the output shaft 9. The torque detection result of the torque sensor 11 is input to an ECU (Electronic Control Unit) 12 as a motor control device for assisting steering. Further, the vehicle speed detection result from the vehicle speed sensor 30 is input to the ECU 12. The intermediate shaft 7 connects the steering shaft 6 and the steering mechanism 4.

The steering mechanism 4 includes a rack and pinion mechanism including a pinion shaft 13 and a rack shaft 14 as a steered shaft. A steered wheel 3 is connected to each end of the rack shaft 14 via a tie rod 15 and a knuckle arm (not shown).
The pinion shaft 13 is connected to the intermediate shaft 7. The pinion shaft 13 rotates in conjunction with the steering of the steering wheel 2. A pinion 16 is provided at the tip (lower end in FIG. 1) of the pinion shaft 13.

  The rack shaft 14 extends linearly along the left-right direction of the automobile. A rack 17 that meshes with the pinion 16 is formed in the middle of the rack shaft 14 in the axial direction. By the pinion 16 and the rack 17, the rotation of the pinion shaft 13 is converted into the axial movement of the rack shaft 14. The steered wheel 3 can be steered by moving the rack shaft 14 in the axial direction.

When the steering wheel 2 is steered (rotated), this rotation is transmitted to the pinion shaft 13 via the steering shaft 6 and the intermediate shaft 7. The rotation of the pinion shaft 13 is converted into an axial movement of the rack shaft 14 by the pinion 16 and the rack 17. Thereby, the steered wheel 3 is steered.
The steering assist mechanism 5 includes a steering assist electric motor 18 and a speed reduction mechanism 19 as a transmission mechanism for transmitting the output torque of the electric motor 18 to the steering mechanism 4. The speed reduction mechanism 19 includes a worm shaft 20 as a drive gear and a worm wheel 21 as a driven gear that meshes with the worm shaft 20. The speed reduction mechanism 19 is accommodated in the gear housing 22.

The worm shaft 20 is connected to a rotating shaft (not shown) of the electric motor 18 through a joint (not shown). The worm shaft 20 is rotationally driven by the electric motor 18. Further, the worm wheel 21 is connected to the steering shaft 6 so as to be integrally rotatable.
When the electric motor 18 rotationally drives the worm shaft 20, the worm wheel 21 is rotationally driven by the worm shaft 20, and the worm wheel 21 and the steering shaft 6 rotate integrally. The rotation of the steering shaft 6 is transmitted to the pinion shaft 13 via the intermediate shaft 7. The rotation of the pinion shaft 13 is converted into the axial movement of the rack shaft 14. Thereby, the steered wheel 3 is steered. That is, the steered wheels 3 are steered by rotating the worm shaft 20 by the electric motor 18.

  The electric motor 18 is a three-phase brushless motor, and is controlled by the ECU 12 as a motor control device. The ECU 12 controls the electric motor 18 based on the torque detection result from the torque sensor 11, the vehicle speed detection result from the vehicle speed sensor 30, and the like. Specifically, the ECU 12 determines a target assist amount using a map in which the relationship between the torque and the target assist amount is stored for each vehicle speed, and controls the assist force generated by the electric motor 18 to approach the target assist amount. To do.

FIG. 2 is a schematic perspective view of the steering assist mechanism 5. Referring to FIG. 2, a housing H for housing ECU 12 as a control device is configured by a first housing 23 and a second housing 24 that are in contact with each other.
The first housing 23 and the second housing 24 are each formed in a substantially square box shape with one end opened. The ends of the first and second housings 23 and 24 are abutted and fastened to each other by a fixing screw 25.

On the other hand, the motor housing 26 of the electric motor includes a cylindrical motor housing main body 27 and the first housing 23 described above.
The gear housing 22 includes a cylindrical drive gear housing 28 that houses the worm shaft 20, a tubular driven gear housing 29 that houses the worm wheel 21, and the second housing 24. Has been.

FIG. 3 is a cross-sectional view of the steering assist mechanism 5. Referring to FIG. 3, the first housing 23 and the second housing 24 form a storage chamber 32 that stores the ECU 12.
The first housing 23 includes a first inner wall surface 33 that defines a part of the accommodation chamber 32, and the second housing 24 includes a second inner wall surface 34 that defines a part of the accommodation chamber 32, and these first inner wall surfaces 33 and the second inner wall surface 34 face the axial direction X1 of the rotating shaft 35 of the electric motor 18.

  The rotating shaft 35 and the worm shaft 20 of the electric motor 18 are arranged coaxially side by side, and both are coaxially connected via a joint 36 so that power can be transmitted. The worm shaft 20 is supported at both ends by the drive gear housing 28 via the first bearing 37 and the second bearing 38. The rotary shaft 35 is rotatably supported by a third bearing 46 held by the first housing 23 and a fourth bearing 47 held by the motor housing body 27.

In the present embodiment, a three-phase brushless motor is used as the electric motor 18. The electric motor 18 includes the motor housing 26, and a rotor 39 and a stator 40 accommodated in the motor housing 26. The rotor 39 is connected to the rotary shaft 35 so as to be integrally rotatable.
The stator 40 is fixed to the inner periphery of the motor housing body 27 of the motor housing 26. The stator 40 includes a stator core 41 fixed to the inner periphery of the motor housing main body 27 and a plurality of coils 42. Stator core 41 includes an annular yoke of stator core 41 and a plurality of teeth protruding radially inward from the inner periphery of this yoke. Each coil 42 is wound around a corresponding tooth.

  Further, in the motor chamber 43 defined by the motor housing body 27 and the first housing 23 of the motor housing 26, an annular or C-shaped bus bar 45 is accommodated. The coil 42 wound around each tooth is connected to the bus bar 45. The bus bar 45 is a conductive connection material used for a connection portion between each coil 42 and a power board 49 described later. The bus bar 45 functions as a power distribution member for distributing power from the power board 49 to each coil 42.

The first housing 23 includes a partition wall 59 that partitions the accommodation chamber 32 and the motor chamber 43 as a bottom wall. The partition wall 59 is provided with the first inner wall surface 33.
Further, a cylindrical portion 48 extending from the partition wall 59 toward the second housing 24 side is formed. An outer ring of the third bearing 46 is held on the inner periphery of the cylindrical portion 48.
In the accommodation chamber 32, a power board 49 and a control board 50 as a circuit board constituting a part of the ECU 12 are accommodated and held. On a power board 49 as a circuit board, at least a part of a power circuit for driving the electric motor 18 (for example, a bare chip of a switching element such as an FET 53) is mounted. A part of the bus bar 45 connected to each coil 42 is connected to the power board 49 via the bus bar terminal 51 that passes through the partition wall 59 of the first housing 23 and enters the housing chamber 32. Yes.

  In the accommodation chamber 32, the power board 49 is disposed relatively close to the first inner wall surface 33 among the first inner wall surface 33 and the second inner wall surface 34. The partition wall 59 having the first inner wall surface 33 includes a thick portion 59a and a relatively thin portion 59b that are relatively thick in the axial direction X1 of the rotating shaft 35 of the electric motor 18. The thick portion 59a is provided so as to protrude into the accommodation chamber 32. The power board 49 is arranged in contact with the first inner wall surface 33 in the thick part 59a. The thick part 59 a is a seat part that receives the power board 49.

In the present embodiment, the power board 49 is in contact with the first inner wall surface 33 in the thick part 59a so as to be able to conduct heat, and the thick part 59a is for releasing the heat of the power board 49. It functions as a heat sink.
The control board 50 is disposed between the second inner wall surface 34 of the second housing 24 and the power board 49 with respect to the axial direction X1 of the rotating shaft 35 of the electric motor 18. The power board 49 and the control board 50 are arranged at a predetermined interval with respect to the axial direction X1 of the rotating shaft 35 of the electric motor 18.

  Next, referring to FIG. 4, which is an exploded perspective view around the ECU 12, a power circuit 52 for driving the electric motor 18 is mounted on the power board 49. The power circuit 52 includes a plurality of FETs 53 (electrolytic effect transistors) as first electric components (electronic components) (two FETs 53 are shown in FIG. 4). The power substrate 49 is composed of a multilayer substrate in which a switching element such as an FET 53 is mounted on the main surface 49a, and the multilayer substrate is a high thermal conductive plate (Fig. Not shown). The main surface 49a is a mounting surface on which electric components such as the FET 53 are mounted on the power board 49.

  A control circuit 54 that controls the power circuit 52 is mounted on the control board 50. The control circuit 54 includes a driver that controls each FET 53 of the power circuit 52 and a CPU that controls the driver. Further, first connectors 55 and 56 are arranged on one side edge of the control board 50. A control signal from the torque sensor 11 (see FIG. 1) or the like is input to the control board 50 via the first connectors 55 and 56.

  The first housing 23 is a substantially square box-shaped member having one end opened. Specifically, the first housing 23 includes a substantially annular outer peripheral wall 57, a rectangular annular flange 58 projecting radially outward from one end of the outer peripheral wall 57, and the partition wall as a bottom wall. 59. A cylindrical portion 48 is formed in the central portion of the partition wall 59 in the storage chamber 32. The outer peripheral wall 57 extends from the outer peripheral edge of the partition wall 59 and surrounds the tubular portion 48.

  The flange 58 has a plurality of (in the present embodiment, a pair) bracket-like attachment portions 60 and 61 projecting outward in the radial direction. The mounting portions 60 and 61 are formed with screw insertion holes 62 and 63 that penetrate the mounting portions 60 and 61 in the thickness direction. The fixing screws 25 for fastening the first and second housings 23 and 24 are inserted into the screw insertion holes 62 and 63, respectively.

The outer peripheral wall 57 that forms a quadrangular ring has four side walls 71 to 74. The mounting portions 60 and 61 are extended from a pair of opposite side walls 72 and 74. Further, the thick part 59a of the partition wall 59 functioning as a heat sink is continuously formed on the inner surface of one side wall 74 where the mounting part 61 is extended.
The side wall 71 is formed with a notch 71a. The first connectors 55 and 56 extend outward from the first housing 23 through the notch 71a.

  FIG. 5 is a plan view of the power board 49 and the power supply module 75. With reference to FIGS. 4 and 5, a power supply module 75 is arranged between the control board 50 and the partition wall 59. The power supply module 75 has a structure in which various electrical components connected to the power supply are collectively held by resin. Thereby, since a plurality of electrical components can be assembled to the first housing 23 in a lump, it is possible to reduce time and effort required to assemble each electrical component in the first housing 23.

The power supply module 75 includes a resin member 76, a second connector 77 provided on the resin member 76, a coil 42, a relay 80, a first capacitor 81, and a second capacitor 82 as electrical components held by the resin member 76. including.
The resin member 76 has a substantially rectangular outer shape along the four side walls 71 to 74 of the first housing 23 when viewed along the axial direction X1. The resin member 76 has a shape surrounding the power substrate 49 and the cylindrical portion 48.

The resin member 76 includes a main frame 83 that surrounds the periphery of the power board 49 when viewed along the axial direction X1. The main frame 83 is formed with screw insertion holes 83a and 83b. The screw insertion holes 83a and 83b are respectively formed with screw insertion holes 49b and 49c at positions corresponding to the screw insertion holes 83a and 83b.
Fixing screws 84 and 85 that pass through the screw insertion holes 83a and 49b; 83b and 49c are screw-coupled to screw holes (not shown) formed in the thick portion 59a. Thereby, the resin member 76 and the power board 49 are fixed to the first housing 23. In the resin member 76, a fixing screw (not shown) provided in a screw insertion hole (not shown) provided in the vicinity of the second connector 77 is screwed to the thin portion 59 b of the first housing 23. It is like that.

The second connector 77 is for connecting a power source such as a battery (not shown) and the power board 49, and is adjacent to the first connector 56. The second connector 77 includes a connector housing 77a integrally formed with the resin member 76, and a pair of terminals 77b and 77c disposed in the connector housing 77a.
The connector housing 77 a protrudes outward of the first housing 23 through the notch 71 b of the side wall 71. The terminal 77b is connected to the positive electrode of a vehicle battery (not shown). The terminal 77c is installed on the vehicle body.

  As shown in FIG. 5, the main frame 83 of the resin member 76 of the power supply module 75 includes a first main frame element 86 and a second main frame element 87 facing each other, and a third main frame element 88 facing each other. And a fourth main frame element 89. These first to fourth main frame elements 86 to 89 are arranged in a square ring shape. The third and fourth main frame elements 88 and 89 connect the opposing ends of the first and second main frame elements 86 and 87, respectively.

The main frame 83 has a reinforcing and partition frame 90 that connects the first main frame element 86 and the second main frame element 87. The reinforcing and partitioning frame 90 extends in parallel with the third main frame element 88. A box structure portion B is formed by a part of the first main frame element 86, a part of the second main frame element 87, the third main frame element 88, and the reinforcing / partitioning frame 90.
The reinforcing / partitioning frame 90 functions to reinforce the deformation strength of the main frame 83 by forming the box structure portion B. The reinforcing / partitioning frame 90 functions to partition the potting material 91 in which various electrical components (electronic components) mounted on the power board 49 are embedded.

Specifically, a bare chip of FET 53 as a first electric component (electronic component) that needs to be embedded in the potting material 91 is mounted on the power substrate 49. On the power board 49, a shunt resistor 92, which is a current sensor, is mounted as a second electrical component that causes a problem when the potting material 91 adheres.
The reinforcing / partitioning frame 90 is disposed between the FET 53 as the first electric component and the shunt resistor 92 as the second electric component. The reinforcing and partitioning frame 90 is in contact with the potting material 91 in which the FET 53 is embedded. The reinforcement / partition frame 90 serves as a guard wall that guards the potting material 91 from flowing out to the shunt resistor 92 side when potting the potting material 91 before solidification.

  If the potting material 91 adheres to the shunt resistor 92, the heat transfer characteristic of the shunt resistor 92 changes, so that the output characteristic as a current sensor changes, whereas in the present embodiment, The above-described adverse effects can be prevented by the reinforcing and partitioning frame 90. The potting material 91 is obtained by injecting a liquid potting material (for example, a synthetic resin molding material such as an epoxy resin, a urethane resin, or silicone) and then curing it.

  The resin member 76 includes a plurality of first reinforcing frames 93 and 94 that connect between the third main frame element 88 and the reinforcing and partitioning frame 90. The first reinforcing frames 93 and 94 extend in parallel with the first and second main frame elements 86 and 87. In addition, the resin member 76 includes a second reinforcing frame 95 that connects intermediate portions of the plurality of first reinforcing frames 93 and 94. The second reinforcement frame 95 extends in parallel with the reinforcement / partition frame 90.

  According to the present embodiment, the reinforcement / partition frame 90 can suppress deformation of the resin member 76 of the power supply module 75, particularly the main frame 83. Therefore, the stress applied to the power board 49 fixed to the resin member 76 and the electrical components (the coil 42, the relay 80, the first capacitor 81, the second capacitor 82, etc.) supported by the resin member 76 is significantly reduced. be able to. As a result, the generation of cracks in the power substrate 49 due to the stress can be prevented, and the durability can be improved. In addition, it is possible to reliably prevent the potting material 91 from adhering to the shunt resistor 92 as the second electrical component, thereby reliably preventing the occurrence of adverse effects on the shunt resistor 92 (changes in sensor output characteristics). can do.

Further, since the main frame 83 and the reinforcing / partitioning frame 90 are integrally formed of a single material, the number of parts is not increased in order to realize the functions of the above-described reinforcement and partitioning. Therefore, the manufacturing cost can be reduced through the reduction of the number of parts and the reduction of assembly man-hours.
In addition, since the box structure portion B is formed by the first main frame element 86, the second main frame element 87, the third main frame element 88, and the reinforcing and partition frame 90 of the resin member 76, the main frame 83 deformation can be remarkably suppressed.

Furthermore, since the resin member 76 includes a plurality of first reinforcing frames 93 and 94 that connect between the third main frame element 88 and the reinforcing and partitioning frame 90, the effect of suppressing deformation of the main frame 83 is increased. Can do.
In addition, since the middle portions of the first reinforcing frames 93 and 94 are connected by the second reinforcing frame 95, the deformation suppressing effect of the main frame 83 can be further enhanced.

  Next, FIG. 6 is a schematic plan view of a power supply module and a power board according to another embodiment of the present invention. This embodiment is different from the embodiment of FIG. 5 in that the resin member 76A of the power supply module 75A has a first reinforcing frame 94A inclined with respect to one first reinforcing frame 93. Is a point. In addition, the resin member 76A has third reinforcing frames 96 and 97 that connect intermediate portions of the first reinforcing frames 93 and 94A to the first main frame element 86 and the second main frame element 87, respectively. This is the point. Therefore, according to the present embodiment, the same operational effects as those of the embodiment of FIG. 5 can be obtained, and the deformation suppressing effect of the main frame 83 can be further enhanced.

  Further, the lengths of the reinforcing and partitioning frame 90, the first reinforcing frame 93, the first reinforcing frame 94A, the second reinforcing frame 95A, the third reinforcing frame 96, and the third reinforcing frame 97 are made different from each other. is there. Thereby, the value of the natural frequency of each reinforcement frame 90,93,94A, 95A, 96,97 can be disperse | distributed. Therefore, the natural frequency of the resin member 76A as a whole can be made not to match the natural frequency of the vibration of the vehicle body and the natural frequencies of the electric power steering device 1, the electric motor 18, and the like. As a result, generation of vibration noise can be suppressed. Further, the power board 49 can be protected from vibration.

In the present embodiment, the lengths of all the reinforcing frames 90, 93, 94A, 95A, 96, and 97 are different from each other, but at least two of the reinforcing frames 90, 93, 94A, 95A, 96, and 97 are reinforced. What is necessary is just to make it the length of a frame differ.
The present invention is not limited to the contents of the above embodiments, and various modifications can be made within the scope of the claims. For example, in the above-described embodiment, an example in which the present invention is applied to a so-called column assist type electric power steering apparatus has been described. The present invention may be applied to the electric power steering apparatus.

  In the above-described embodiment, the example in which the present invention is applied to the electric power steering apparatus that outputs the output of the electric motor as the steering assist force has been described, but the present invention is not limited thereto. For example, a transmission ratio variable mechanism that includes a transmission ratio variable mechanism capable of changing a ratio of a steered wheel turning angle to a steering angle of a steering member, and that uses an output of an electric motor to drive the transmission ratio variable mechanism, is used for vehicle steering. Even if the present invention is applied to a device, a steer-by-wire type vehicle steering device in which the mechanical connection between the steering member and the steered wheel is released and the steered wheel is steered by the output of the electric motor, etc. Good.

  DESCRIPTION OF SYMBOLS 1 ... Electric power steering device (vehicle steering device), 2 ... Steering member, 4 ... Steering mechanism, 5 ... Steering assist mechanism, 12 ... ECU (motor control device), 18 ... Electric motor, 42 ... Coil (connected to power supply) 49 ... Power board (circuit board), 50 ... Control board, 53 ... FET (first electrical part), 75; 75A ... Power supply module, 76; 76A ... Resin member, 80 ... Relay (connected to power supply) , 81... First capacitor (component connected to power supply), 82... Second capacitor (component connected to power supply), 83... Main frame, 86. 2 main frame elements, 88 ... third main frame element, 89 ... fourth main frame element, 90 ... reinforcement and partition frame, 91 ... potting material, 92 ... shunt resistance (second electric component), 93, 94; 93, 94A ... 1st reinforcement frame 95; 95A ... second reinforcing frame, 96, 97 ... third reinforcing frame

Claims (7)

A motor control device for controlling an electric motor for generating a steering force;
The motor control device includes a component connected to a power source and a power module having a resin member that holds the component, a circuit board held by the power module, and a first electrical component mounted on the circuit board. Embedded potting material,
The resin member includes a main frame that surrounds the circuit board, and a reinforcing and partition frame that reinforces the main frame and partitions between the second electrical component on the circuit board and the potting material. apparatus. The main frame according to claim 1, wherein the main frame includes a first main frame element and a second main frame element facing each other, and a third main frame element connecting the first main frame element and the second main frame element. Including a main frame element,
The reinforcing and partitioning frame connects the first main frame element and the second main frame element,
A vehicle steering apparatus in which a box structure is formed by the first main frame element, the second main frame element, the third main frame element, and the reinforcing and partitioning frame.   3. The vehicle steering apparatus according to claim 1, wherein the main frame and the reinforcing / partitioning frame are integrally formed of a single material.   4. The vehicle steering apparatus according to claim 3, wherein the resin member includes a first reinforcing frame that connects the third main frame element and the reinforcing and partitioning frame. In claim 4, a plurality of the first reinforcing frames are provided,
The said resin member is a steering device for vehicles containing the 2nd reinforcement frame which connects between some 1st reinforcement frames.   6. The vehicle steering system according to claim 5, wherein the resin member includes a third reinforcing frame that connects each first reinforcing frame to a corresponding main frame element.   The vehicle steering device according to any one of claims 4 to 6, wherein at least two lengths of the reinforcing frame are different from each other.

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