JP2009023456A - Electric power steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily-assemblable electric power steering device that achieves suppression of increase in manufacturing costs by surely preventing intrusion of conductive foreign matters between electrodes of each motor-side connection terminal while also achieving structural simplification. <P>SOLUTION: A terminal block 24c on the control unit side and connection terminals 5c, 5d of an electric motor are electrically connected with each other outside a speed-reduction gearbox while being opened to the atmosphere. A terminal cover 27 covers around a pair of the connection terminals 5c, 5d and the terminal block 24c. The connection terminals 5c, 5d are respectively arranged in a first connection space S1 and a second connection space S2 partitioned by a partition plate 35 entering a recessed part 32 of a terminal block 28, of a terminal cover 27. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric power steering apparatus including a steering column having a steering shaft to which steering torque is transmitted, and an electric motor for transmitting a steering assist force to the steering shaft via a speed reduction mechanism in a speed reduction gear box. .

As a conventional electric power steering device, for example, an electric motor is accommodated in a rack case or a steering gear box in which a rack shaft is slidably accommodated or mounted, and a control board for controlling drive of the electric motor is accommodated. When the housing is formed in the rack case or the steering gear box, and the control board inserted from the opening is brought into contact with the mounting boss formed on the bottom portion facing the opening of the housing, the housing protrudes from the motor into the housing. There has been proposed an electric power steering device in which board connection terminals provided on a control board are in contact with each other and are electrically connected to motor side connection terminals (see, for example, Patent Document 1).
JP 2005-329866 A

By the way, in the electric power steering device of Patent Document 1 described above, when the device is assembled, conductive foreign matters such as iron scraps generated in the steering gear box can easily enter the connection portion of the motor side connection terminal and the board connection terminal. Then, there is a possibility that the infiltrated conductive foreign material enters between the electrodes of the motor side connection terminal and an electrical short circuit occurs.
For this reason, the device of Patent Document 1 must be provided with a seal structure in which conductive foreign matter does not enter the connection portions of the motor side connection terminal and the board connection terminal. However, a complicated structure tends to be provided in order to provide a seal structure in the housing. Assembling takes time, there is a problem in terms of manufacturing cost.

  Therefore, the present invention has been made paying attention to the above-mentioned unsolved problems of the conventional example, and it is easy to assemble, and conductive foreign matter enters between the electrodes of the motor side connection terminal while simplifying the structure. It is an object of the present invention to provide an electric power steering device that can reliably prevent this from occurring and suppress an increase in manufacturing cost.

  In order to achieve the above object, an electric power steering apparatus according to a first aspect of the present invention includes a steering column having a steering shaft to which steering torque is transmitted, and a steering assist to the steering shaft via a reduction mechanism in a reduction gear box. In the electric power steering apparatus including an electric motor for transmitting force, the control unit including a control board on which the electric motor and a control circuit for driving and controlling the electric motor are mounted in the reduction gear box. Either one of a connection terminal and a terminal block is formed at a position close to the control unit of the electric motor that is outside the reduction gear box, and the connection terminal and terminal are positioned at a position close to the electric motor of the control unit. When either one of the bases is formed and these connection terminals and terminal blocks are electrically connected, To, and placing the connection terminal and a terminal cover for covering the periphery of the terminal block electrically connected.

According to a second aspect of the present invention, there is provided the electric power steering apparatus according to the first aspect, wherein the terminal cover and the terminal block are provided with one of the connection terminal and the terminal block of the electric motor. Partitioning means for arranging the electrodes in different cover internal spaces was provided.
Furthermore, the invention according to claim 3 is the electric power steering apparatus according to claim 2, wherein the partitioning means is a single recess formed in the terminal block so as to separate the pair of electrodes of the terminal block. And a partition plate that protrudes from the inner wall of the terminal cover and enters the recess.

  According to the electric power steering apparatus of the present invention, either the connection terminal or the terminal block is formed in the electric motor that is outside the reduction gear box, and either the connection terminal or the terminal block is formed in the control unit. Since these connection terminals and the terminal block are electrically connected to the outside of the reduction gear box in the open state to the atmosphere, the electric power steering device can be electrically conductive in the reduction gear box when assembled. Even if a foreign substance is generated, an electrical short circuit does not occur in one of the pair of electrodes of the connection terminal and the terminal block of the electric motor. In addition, since the periphery of the connection terminal and the terminal block that are electrically connected is covered with a terminal cover, intrusion of other conductive foreign matter into either the connection terminal or the terminal block of the electric motor is prevented, An electrical short between the pair of electrodes can be reliably prevented.

  In addition, it is a structure that only arranges the terminal cover so as to cover the periphery of the connection terminal and the terminal block that are electrically connected, the terminal cover can be easily mounted, and the structure can be simplified. An increase in the manufacturing cost of the electric power steering device can be suppressed.

Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing a right-hand drive vehicle according to an embodiment of the electric power steering apparatus according to the present invention, and FIG. 2 is a perspective view showing the embodiment from the left. Fig. 4 is a front view of this embodiment, Fig. 4 is a longitudinal sectional view showing the main part of the reduction gear box, Fig. 5 is a perspective view showing the appearance of the reduction gear box, and Fig. 6 shows the connection relationship between the electric motor and the control unit. FIG. 7 is a front view showing the internal structure of the electric motor, FIG. 8 is an exploded perspective view of the control unit, and FIG. 9 shows a terminal block integrated with the control unit and a terminal cover engaged with the terminal block. FIG. 10 is an enlarged perspective view of the terminal block and the terminal cover, and FIG. 11 is a cross-sectional view in which the terminal cover is attached to the electrically connected terminal block and connection terminals.

  In FIG. 1, reference numeral 1 denotes a column-type electric power steering device, in which a reduction gear box 4 is connected to a steering column 3 that rotatably houses a steering shaft 2 connected to a steering wheel (not shown). An electric motor 5 whose axial direction is extended in a direction perpendicular to the axial direction of the steering column 3 is disposed in the reduction gear box 4.

  The steering column 3 has a double tube structure of an inner tube 3a and an outer tube 3b. The outer tube 3 b and the reduction gear box 4 of the steering column 3 are attached to the vehicle body side by an upper mounting bracket 6 and a lower mounting bracket 7. The lower mounting bracket 7 is composed of a mounting plate portion 7a attached to a vehicle body side member (not shown) and a pair of support plate portions 7b extending in parallel from the lower surface of the mounting plate portion 7a with a predetermined distance in the left-right direction. Is formed. And the lower end of the support plate part 7b is rotatably connected to the support part 4b integrally formed in the vehicle front side of the reduction gear box 4 via the pivot 7c.

  The upper mounting bracket 6 includes a mounting plate portion 6a attached to a vehicle body side member (not shown) and a pair of support plate portions fixed to the lower end of the mounting plate portion 6a and spaced apart in the left-right (vehicle width) direction. 6b and a tilt mechanism 6c for supporting the outer tube 3b of the steering column 3 formed on the pair of support plate portions 6b. Then, the tilt lever 6g of the tilt mechanism 6c is rotated to release the support state of the outer tube 3b, whereby the tilt position of the steering column 3 can be adjusted up and down around the pivot 7c of the lower mounting bracket 7. .

As shown in FIG. 4, the steering shaft 2 includes an input shaft 2a whose upper end is connected to a steering wheel (not shown), and a torsion bar 2b connected to the lower end of the input shaft 2a via a torsion bar 2b. It is comprised with the output shaft 2c to cover.
The reduction gear box 4 is formed by die-casting, for example, any one of materials having high thermal conductivity, such as aluminum, aluminum alloy, magnesium, and magnesium alloy. As shown in FIGS. 4 and 5, the reduction gear box 4 includes a worm storage portion 12 that stores a worm 11 connected to an output shaft (not shown) of the electric motor 5, and a lower side of the worm storage portion 12. A worm wheel housing part 14 for housing a worm wheel 13 having a central axis perpendicular to the central axis thereof and meshing with the worm 11, and a torque integrally and coaxially connected to the vehicle rear side of the worm wheel storage part 14 Torque sensor storage portion 16 for storing the sensor 15, motor mounting portion 17 for attaching the electric motor 5 formed on the open end surface of the worm storage portion 12, and a cylindrical shape formed at the vehicle rear end of the torque sensor storage portion 16 The worm wheel storage part 14 and the torque sensor storage part 1 are straddled across a part of the column mounting part 18, the worm storage part 12 and the worm wheel storage part 14. And a control unit mounting section 20 for mounting the control unit 19, which is formed in a plane perpendicular to the central axis of. The vehicle front end portion of the steering column 3 is externally fitted and connected to the column mounting portion 18 of the reduction gear box 4.

  Here, as shown in FIG. 4, the torque sensor 15 magnetically detects the twisted state between the input shaft 2a and the output shaft 2c of the steering shaft 2 and transmits the steering torque transmitted to the steering shaft to a pair of detection coils. The external connection terminals 15c and 15d are configured to be detected by 15a and 15b and project outwardly in parallel to the direction perpendicular to the central axis of the steering column 3 at the start and end of winding of the pair of detection coils 15a and 15b, respectively. 15e and 15f are connected, and the protruding portions of the external connection terminals 15c to 15f are bent at the central portion in parallel with the central axis of the steering column 3 to form an L shape.

  As shown in FIG. 6, the electric motor 5 has connection terminals 5c and 5d formed at positions close to and opposed to the control unit 19 mounted on the control unit mounting portion 20 at a position close to the mounting flange 5b. As shown in FIG. 7, each of the connection terminals 5c and 5d is insulated from each other in a synthetic resin brush support 5f having an armature insertion hole in the center of the bottom, and is connected to two sets of brushes 5g and 5h. The arc-shaped connection terminals 5i and 5j connected individually are integrally formed at one end facing each other.

As shown in FIG. 5, the control unit mounting portion 20 formed in the reduction gear box 4 has a flat mounting surface 20a formed between the worm storage portion 12 and the upper side of the worm wheel storage portion 14 below. And a flat mounting surface 20a formed on the upper surface of the torque sensor housing portion 16 and a unit mounting surface 20b perpendicular to the upper surface of the torque sensor housing portion 16 are formed in an L shape when viewed from the left-right direction.
Further, a frame mounting surface 20c having a narrow width is formed on the rear end surface of the motor mounting portion 17 in parallel with the flat mounting surface 20a and at a position on the vehicle rear side from the flat mounting surface 20a. And the external connection terminals 15c-15f of the torque sensor 15 protrude from the center part of the left-right direction of the unit mounting surface 20b.

As shown in FIG. 8, the control unit 19 mounted on the control unit mounting portion 20 includes a metal heat radiating plate 21 having a high heat transfer rate, a power board 23, and a synthetic resin frame 24 having a rectangular frame shape. The control board 25 and the cover 26 are provided.
The heat radiating plate 21 is directly fixed to the flat mounting surface 20a of the control unit mounting portion 20 via heat radiating grease. The power board 23 is a discrete component 23a, 23b such as an H bridge circuit composed of a power switching element such as a field effect transistor that drives and controls the electric motor 5, and a pulse width modulation circuit that drives the power switching element of the H bridge circuit. Is implemented. A synthetic resin frame 24 surrounds the power board 23. The control board 25 is attached to the front surface of the synthetic resin frame 24 and has through holes 25a to 25d that are directly inserted through the external connection terminals 15c to 15f of the torque sensor 15. A steering assist current command value is calculated based on the vehicle speed detection value from the vehicle speed sensor that is not operated, and current feedback control is performed based on the steering assist current command value and the detected value of the motor current output to the electric motor 5 to obtain a power board By calculating a voltage command value to the pulse width modulation circuit 23, a discrete unit 25e such as a micro control unit (MCU) for controlling a steering assist force generated by the electric motor 5 and its peripheral devices is mounted. The cover 26 covers the power board 23, the synthetic resin frame 24, and the control board 25.

  The synthetic resin frame 24 includes a rectangular frame-shaped frame body 24a, a mounting plate portion 24b formed on the left end of the frame body 24a and fixed to the frame mounting surface 20c of the reduction gear box 4, and the mounting plate. A terminal block 24c fixed on the portion 24b and electrically connected to the connection terminals 5c and 5d of the electric motor 5 and a female connector 45 fixed to the right end of the frame body 24a are provided. The female connector 45 is connected to a power supply connector 45a connected to a battery (not shown) via a power supply male connector 46, and a network such as CAN that exchanges data with control devices in each part of the vehicle body. And a signal connector 45b. The power board 23 and the control board 25 are connected via the connection terminal 22a.

  In the control unit 19 configured as described above, the power board 23 is screwed to the inner surface of the heat dissipation plate 21. Then, heat radiation grease is applied to the flat mounting surface 20a of the control unit mounting portion 20 of the reduction gear box 4, and the heat radiation plate 21 is placed on the flat mounting surface 20a and screwed. The synthetic resin frame 24 is placed on the flat mounting surface 20 a and the frame mounting surface 20 c so as to surround the power board 23. Then, the mounting plate portion 24 b of the synthetic resin frame 24 is screwed to the frame mounting surface 20 c of the reduction gear box 4. Further, on the front side of the synthetic resin frame 24, the control board 25 is screwed after inserting the external connection terminals 15c to 15f of the torque sensor 15 through the through holes 25a to 25d, and the external connection terminals 15c to 15f. The control unit 19 is mounted on the control unit mounting portion 20 of the reduction gear box 4 by soldering the through holes 25 a to 25 d and mounting the cover 26 on the flat mounting surface 20 a of the control unit mounting portion 20.

Then, the assembly of the steering column 3, the steering shaft 2, the worm 11 and the worm wheel 13 is completed, and the mounting flange 5b of the electric motor 5 is assembled to the motor mounting portion 17 as shown in FIG. The connection terminals 5c and 5d of the electric motor 5 are electrically connected to the terminal block 24c fixed to the mounting plate portion 24b of the frame 24.
Here, as shown in FIGS. 1 to 3, the electrically connected terminal block 24 c and the connection terminals 5 c and 5 d are covered with a terminal cover 27 made of synthetic resin.

9 is a diagram showing the shapes of the terminal block 24c and the terminal cover 27 integrated with the control unit 19, FIG. 10 is an enlarged view of the terminal block 24c and the terminal cover 27, and FIG. It is sectional drawing which shows the state in which the terminal cover 27 is engaging with the terminal block 24c connected to 1 and the connection terminals 5c and 5d.
As shown in FIG. 9, the terminal block 24c integrated with the control unit 19 includes a substantially rectangular parallelepiped terminal block 28 rising from the mounting plate portion 24b. A pair of plate-like electrodes 30 and 31 provided with screw holes 29 are embedded in a rectangular side surface 28a facing in the direction apart in the longitudinal direction. As shown in FIG. 10, a single recess 32 is formed on the rectangular side surface 28 a of the terminal block 28 so as to separate the pair of electrodes 30 and 31. Further, a pair of engaging projections 33 with which the terminal cover 27 engages are formed on both side surfaces of the terminal block 28 in the longitudinal direction.

  As shown in FIG. 10, the terminal cover 27 is a rectangular parallelepiped box-shaped member capable of covering the side surface and the upper surface of the terminal block 28 while providing a predetermined space between the terminal block 28 and the rectangular side surface 28a. is there. Engaging grooves 34 that engage with the pair of engaging protrusions 33 described above when the terminal block 28 is covered are formed on the side plates of the terminal block 28 in the longitudinal direction. In addition, a partition plate 35 is integrally formed on the inner wall of the terminal cover 27 so that, when the terminal block 28 is covered, a distal end portion enters a single recess 32 provided on the side surface 28 a of the terminal block 28.

  Further, as shown in FIG. 11, the connection terminals 5c and 5d of the electric motor 5 correspond to the pair of electrodes 30 and 31 of the terminal block 24c so that the screw passage holes 5e formed in the connection terminals 5c and 5d correspond to the screw holes 29, respectively. In contact, the fixing screw 5o is screwed into the screw hole 29 from the connection terminal 5c, 5d side, so that one electrode 30 is electrically connected to one connection terminal 5c and the other electrode 31 is connected to the other connection terminal 5d. Are electrically connected.

  When the engagement groove 34 of the terminal cover 27 is engaged with the engagement protrusion 33 of the terminal block 28 and the terminal cover 27 is detachably attached to the terminal block 28, the outer periphery of the terminal block 28 is covered by the terminal cover 27. . At the same time, due to the partition plate 35 of the terminal cover 27 that has entered the recess 32 of the terminal block 28, the space on the pair of electrodes 30 and 31 side (side surface 28a side) of the terminal cover 27 becomes one connection terminal 5c and one electrode. 30 is electrically divided into a first connection space S1 and a second connection space S2 in which the other connection terminal 5d and the other electrode 31 are electrically connected.

Next, the operation of the above embodiment will be described.
When an ignition switch (not shown) of the vehicle is turned on and electric power is supplied from the battery to the power board 23 and the control board 25, a steering assist control process is executed by the micro control unit (MCU), and the torque sensor 15 and the vehicle speed sensor (not shown) are connected. A steering assist current command value is calculated based on the detected value. A current feedback process is executed based on the steering assist current command value and the motor current detected by the motor current detection unit to calculate a voltage command value. By supplying this voltage command value to the gate drive circuit of the power board 23 and controlling the H bridge circuit, a motor drive current flows through the electric motor 5 and the electric motor 5 needs to be operated in the forward or reverse direction. Drive to generate force.

Therefore, a steering assist force corresponding to the steering torque of the steering wheel is generated from the electric motor 5, and this steering assist force is transmitted to the output of the steering shaft 2 via the worm 11 and the worm wheel 13, whereby the steering wheel Can be steered with a light steering force.
Here, in the present embodiment, the terminal block 24c on the control unit 19 side and the connection terminals 5c and 5d of the electric motor 5 are electrically connected in a state opened to the atmosphere outside the reduction gear box 4, Even when a conductive foreign matter such as iron scrap is generated in the worm 11 or the like in the reduction gear box 4 when the electric power steering apparatus 1 is assembled, an electrical short is generated in the connection terminals 5c and 5d of the electric motor 5. There is no fear.

  Further, the periphery of the pair of connection terminals 5c and 5d and the terminal block 24c is covered with a terminal cover 27, and each of the connection terminals 5c and 5d is formed in the recess 32 of the terminal block 28 and the partition plate 35 of the terminal cover 27. Is disposed in the first connection space S1 and the second connection space S2 as a so-called labyrinth structure. For example, even if a conductive foreign object enters the first connection space S1 and contacts the connection terminal 5c, It is impossible for the conductive foreign matter to simultaneously contact the connection terminal 5d on the second connection space S2 side through the labyrinth structure, and electrical short-circuit between the connection terminals 5c and 5d can be reliably prevented.

  Further, the terminal block 24c on the control unit 19 side and the connection terminals 5c and 5d of the electric motor 5 are electrically connected outside the reduction gear box 4, and the engaging groove 34 provided in the terminal cover 27 is connected to the terminal block 24c. Since the terminal cover 27 is simply detachably attached to the terminal block 28 by engaging with the engaging protrusions 33 of the terminal block 28, the terminal cover 27 can be easily attached and the structure can be simplified. Thus, an increase in manufacturing cost of the electric power steering apparatus 1 can be suppressed.

In the above embodiment, the connection terminals 5c and 5d are provided in the electric motor 5 and the terminal block 24c is provided in the control unit 19. However, the present invention is not limited to this, and the terminal block is provided in the electric motor 5. And a connection terminal may be provided on the control unit 19.
In the above embodiment, the case where the electric motor 5, the control unit 19, and the female connector 45 are arranged in a straight line along a line orthogonal to the central axis of the steering column 3 has been described. However, the present invention is not limited thereto. Instead of this, they may be arranged in a straight line along a line intersecting the central axis of the steering column 3.

  Moreover, in the said embodiment, although the case where a brush motor was applied as the electric motor 5 was demonstrated, it is not limited to this, You may make it apply a brushless motor, In this case, a connection terminal 5c and 5d are connected to the power supply side of the excitation coil of each phase, and, for example, an inverter circuit having a field effect transistor (FET) for driving a brushless motor on the power board 23 and a gate of the field effect transistor of the inverter circuit are pulse width modulated. A gate driving circuit driven by a signal may be mounted.

  Furthermore, in the above-described embodiment, the case where the present invention is applied to a right-hand drive vehicle has been described. However, the present invention is not limited to this, and when applied to a left-hand drive vehicle, the reduction gear box 4 and the electric motor 5 are used. The control unit 19 is arranged symmetrically with respect to the vertical plane passing through the central axis of the steering column 3, that is, the electric motor 5 is arranged on the right side of the control unit 19, and the female connector 45 and the terminal block 24c of the control unit 19 are connected. What is necessary is just to arrange | position on the left side, Furthermore, you may make it arrange | position the electric motor 5 on the vehicle outer side, and arrange | position the female connector 45 and the terminal block 24c on the vehicle inner side.

It is the perspective view shown from the right direction at the time of applying one Embodiment of the electric power steering device which concerns on this invention to a right-hand drive vehicle. It is the perspective view which showed the apparatus of FIG. 1 from the left direction. It is a front view of the apparatus of FIG. It is a longitudinal cross-sectional view which shows the principal part of the reduction gear box which comprises an electric power steering apparatus. It is a perspective view which shows the external appearance of the reduction gear box which comprises an electric power steering device. It is a perspective view which shows the connection relation of the electric motor which comprises an electric power steering apparatus, and a control unit. It is a front view which shows the internal structure of the electric motor which comprises an electric power steering apparatus. It is a disassembled perspective view of a control unit. It is a perspective view which shows the terminal block integrated with the control unit, and the terminal cover engaged with this terminal block. It is the perspective view which expanded and showed the terminal block and the terminal cover. It is sectional drawing which attached the terminal cover to the terminal block and connection terminal which were electrically connected.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electric power steering device, 2 ... Steering shaft, 2a ... Input shaft, 2b ... Torsion bar, 2c ... Output shaft, 3 ... Steering column, 3a ... Inner tube, 3b ... Outer tube, 4 ... Reduction gear box, 4b ... Support part, 5 ... Electric motor, 5b ... Mounting flange, 5c, 5d ... Connection terminal, 5e ... Screw passage hole, 5g, 5h ... Brush, 5i, 5j ... Connection terminal, 5o ... Fixing screw, 6 ... Upper mounting bracket, 6a ... Mounting plate portion, 6b ... Support plate portion, 6c ... Tilt mechanism, 6g ... Tilt lever, 7 ... Lower mounting bracket, 7a ... Mounting plate portion, 7b ... Support plate portion, 7c ... Axis, 11 ... Worm, 12 ... Worm housing part, 13 ... worm wheel, 14 ... worm wheel housing part, 15 ... torque sensor, 15a, 15b ... detection coil, 15c-15f ... external connection terminal, 16 ... Luc sensor housing, 17 ... Motor mounting, 18 ... Column mounting, 19 ... Control unit, 20 ... Control unit mounting, 20a ... Flat mounting surface, 20b ... Unit mounting surface, 20c ... Frame mounting surface, 21 ... Heat radiation Plate, 22a ... Connection terminal, 23 ... Power board, 23a, 23b ... Discrete parts, 24 ... Synthetic resin frame, 24a ... Frame body, 24b ... Mounting plate part, 24c ... Terminal block, 25 ... Control board, 25a-25d ... through holes, 25e ... discrete parts, 26 ... covers, 27 ... terminal covers, 28 ... terminal blocks, 28a ... side surfaces, 29 ... screw holes, 30, 31 ... electrodes, 32 ... recesses, 33 ... engaging protrusions, 34 ... Engagement groove, 35 ... partition plate, S1 ... first connection space (cover internal space), S2 ... second connection space (cover internal space), 45 ... female core Kuta, 45a ... power connector, 45b ... signal connector, the male connector 46 ... Power

Claims (3)

An electric power steering apparatus comprising: a steering column having a steering shaft to which steering torque is transmitted; and an electric motor that transmits a steering assist force to the steering shaft via a reduction mechanism in a reduction gear box.
A control unit including a control board on which the electric motor and a control circuit for driving and controlling the electric motor are mounted in the reduction gear box, and the control unit of the electric motor external to the reduction gear box; Either one of the connection terminal and the terminal block is formed at a position close to the other, and the other of the connection terminal and the terminal block is formed at a position close to the electric motor of the control unit, and the connection terminal and the terminal block are formed. Electrical connection,
An electric power steering apparatus comprising a terminal cover that covers the periphery of the connection terminal and the terminal block that are electrically connected.   The terminal cover and the terminal block are provided with partition means for arranging a pair of electrodes provided on either the connection terminal or the terminal block of the electric motor in different cover internal spaces, respectively. The electric power steering apparatus according to claim 1.   The partition means is composed of a single recess formed in the terminal block so as to separate a pair of electrodes of the terminal block, and a partition plate that protrudes from the inner wall of the terminal cover and enters the recess. The electric power steering apparatus according to claim 2, wherein the electric power steering apparatus is provided.

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