JP5003901B2 - Electric power steering device - Google Patents

Description

  The present invention relates to an electric power steering apparatus.

  The electric power steering apparatus decelerates the rotation of an electric motor with a gear box to give a steering assist torque to a vehicle steering system. In such an electric power steering apparatus, a power harness for power feeding and a signal line for a rotation sensor (a rotation sensor line for signal transmission / reception) are drawn out from the electric motor, and a signal line for a torque sensor (signal transmission / reception) from the gear box. Torque sensor wires) are drawn out, and the plurality of electric wires are each connected to the ECU.

In recent years, for the purpose of improving the wiring work of such a plurality of harnesses (electric wires), for example, a technique for connecting two harnesses to one connector using a connector having a first housing and a second housing (patent) Patent Document 1), a technique of providing a harness terminal from a sensor in a fixed position and directly connecting a control board to the terminal is disclosed (see Patent Document 2).
JP 2006-156182 A JP 2006-141139 A

  However, as described in Patent Document 1 described above, even with the technique of connecting two harnesses to one connector, there are two harnesses to the connector. The position (phase) regulation work between the harnesses is still necessary. In addition, when the technique described in Patent Document 2 described above is employed, it is necessary to strictly manage the component dimensions, the structure becomes complicated, the cost increases, and the connection workability may deteriorate. is there.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an electric power steering device capable of improving workability during wiring.

  In order to achieve the above object, an electric power steering apparatus according to the present invention connects an electric motor with a built-in rotation sensor and a gear box with a built-in reduction mechanism and a torque sensor to reduce the rotation of the electric motor. Is an electric power steering device that decelerates at a speed to give a steering assist torque to the steering system of the vehicle, and is connected to a torque sensor and arranged on the gear box side, and on the motor side wiring arranged on the electric motor side And the box side wiring includes one end connected to the torque sensor and includes a wiring portion in the box arranged in the gear box, and the gear box connected to the wiring portion in the box. A wiring part outside the box including the other end drawn from the surface facing the electric motor to the electric motor side. The motor side wiring is connected to the box side wiring by being drawn to the gear box side from the facing part of the electric motor to the gear box connected to the motor inner wiring part and the motor wiring part. A first motor outer wiring portion including one end, and a second motor outer wiring portion including the other end drawn from a common through hole together with a rotation sensor wire connected to the motor inner wiring portion and arranged in the electric motor; , Has.

  When such a configuration is adopted, the end portion of the box side wiring arranged on the gear box side of the torque sensor wire is drawn out to the electric motor side, and the gear box side of the motor side wiring arranged on the electric motor side of the torque sensor wire Are connected to each other, and the electric motor and the gear box are coupled to each other. In this state, the second motor outer wiring portion of the motor side wiring and the rotation sensor wire are drawn out from the common through hole of the electric motor in the same bundle state, so two lines (torque sensor) Lines and rotation sensor lines). Accordingly, it is not necessary to strictly manage the component dimensions, and the structure is not complicated, so that the workability during wiring can be improved while suppressing an increase in cost.

  In the electric power steering apparatus, the second motor outer wiring portion of the torque sensor wire drawn out from the through hole and the rotation sensor wire can be connected to one connector housing.

  When such a configuration is adopted, the torque sensor line and the rotation sensor line can be simultaneously connected to the connection destination by connecting one connector housing to the connection destination.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the electric power steering apparatus which can improve the workability | operativity at the time of wiring.

  Hereinafter, an electric power steering apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  The electric power steering apparatus 10 according to the present embodiment gives a steering assist torque to the steering system components of the vehicle so as to assist the operation force to the steering wheel. As shown in FIG. And a box 13.

  The outer portion of the electric motor 12 is configured by a substantially bottomed cylindrical motor case 20 and a substantially plate-like flange 21 attached so as to close the opening side of the motor case 20.

  A bearing housing 22 is formed at the bottom of the motor case 20, and a rear bearing 23 is held inside the bearing housing 22. A stator core 25 is fixed to the inner peripheral surface of the body portion of the motor case 20. An insulator 26 is disposed on both sides of the stator core 25 in the motor axial direction, and a coil 27 is provided on the stator core 25 via the insulator 26. It is wound.

  The flange 21 is formed with an annular fitting portion 30 that protrudes rearward in the motor axial direction and is fitted into the opening of the motor case 20. A bearing holding recess 32 for holding the bearing 31 is formed. The output shaft 36 of the rotor 35 is rotatably supported by the front bearing 31 held in the bearing holding recess 32 and the rear bearing 23 held in the bearing housing 22 of the motor case 20. The rotor 35 has an output shaft 36 protruding forward from the flange 21 in the motor axial direction.

  A resolver rotor 38 is fixed to the output shaft 36 of the rotor 35 at a position behind the flange 21 in the motor axial direction. The resolver stator 39 is fixed to the inner surface of the flange 21 so as to face the resolver rotor 38. The resolver stator 39 detects the rotational position of the magnetic poles of the rotor 35 by detecting the rotational position of the resolver rotor 38. The resolver rotor 38 and the resolver stator 39 are built in the electric motor 12 and constitute a rotation sensor 40 that detects the rotation position of the rotor 35. A terminal block 44 for holding a power harness 43 for supplying power to the coil 27 is disposed inside the flange 21. The power harness 43 is led out to the outside along the radial direction of the motor from a through hole 45 formed between the flange 21 and the motor case 20.

  The flange 21 is formed with an annular fitting convex portion 48 protruding forward in the motor axial direction, and the fitting convex portion 48 is fitted to the gear box 13 when connected to the gear box 13. In addition, a through hole 49 is formed through the flange 21 in the motor radial direction on the inner side in the motor radial direction than the fitting portion 30 and the fitting convex portion 48. Further, the flange 21 is formed with an attachment hole 51 through which the attachment bolt 50 is inserted on the outer side in the motor radial direction than the fitting portion 30 and the fitting convex portion 48. Here, the front surface of the flange 21 in the motor axial direction is a surface 52 facing the gear box 13.

  The gear box 13 incorporates a reduction mechanism 55 for reducing the rotation of the electric motor 12. The speed reduction mechanism 55 includes a worm wheel 56 and a worm 57 that meshes with the worm wheel 56, and the rotational force of the worm 57 coupled to the output shaft 36 of the electric motor 12 is transmitted via the worm wheel 56. Is transmitted to the steering system components.

  An attachment flange portion 60 that is attached to the electric motor 12 is formed in the gear box 13. As shown in FIG. 2, the mounting flange portion 60 is formed with a fitting concave portion 61 having a circular shape in the axial direction that is recessed along the axial direction of the worm 57, and is attached to the outside of the fitting concave portion 61. A mounting screw hole 62 into which the bolt 50 is screwed is formed. Further, a through hole 63 is formed through the fitting recess 61 along the axial direction of the worm 57. Here, the surface of the mounting flange portion 60 on the rear side in the axial direction of the worm 57 is a surface 64 facing the electric motor 12. The gear box 13 incorporates a torque sensor 65 for detecting the steering torque, and a torque sensor cover 66 for maintenance of the torque sensor 65 is detachably provided.

  The facing surface 52 of the electric motor 12 to the gear box 13 and the facing surface 64 of the gear box 13 to the electric motor 12 are arranged in a state of facing each other. The fitting convex part 48 of the electric motor 12 is fitted to 61. Then, the mounting bolt 50 inserted through the mounting hole 51 of the electric motor 12 is screwed into the mounting screw hole 62 of the gear box 13, whereby the electric motor 12 and the gear box 13 are connected and fixed. . In this state, the output shaft 36 of the electric motor 12 and the worm 57 of the gear box 13 are connected so as to be integrally rotatable. Then, the through hole 49 of the electric motor 12 and the through hole 63 of the gear box 13 are overlapped with each other in the motor radial direction position relative to the spigot portion 68 including the fitting convex portion 48 and the fitting concave portion 61.

  Here, the configuration of the torque sensor wire 77 for transmitting and receiving signals to the torque sensor 65 built in the gear box 13 will be described. The torque sensor line 77 includes a box side wiring 71 disposed on the gear box 13 side and a motor side wiring 75 disposed on the electric motor side.

  The box-side wiring 71 includes one end connected to the substrate 70 of the torque sensor 65 built in the gear box 13, and the box-side wiring portion disposed in the gear box 13 is connected to and opposed to the box-side wiring portion. The wiring is formed through a through-hole 63 formed in the surface 64, and includes an outside-box wiring portion including the other end that is drawn out of the gear box 13 from the through-hole 63. A connector housing 72 is attached to the other end (drawing end) of the box side wiring 71.

  On the other hand, the motor-side wiring 75 is drawn out to the gear box 13 side from an in-motor wiring portion arranged in the electric motor 12 and a facing surface 52 to the gear box 13 of the electric motor 12 connected to the in-motor wiring portion. The first motor outer wiring portion including one end connected to the box side wiring 71 and the rotation sensor wire 80 connected to the motor inner wiring portion and arranged in the electric motor 12 are drawn out from a common through hole 81. And a second motor outer wiring portion including the other end.

  A connector housing 76 is attached to one end (drawing end) included in the first motor outer wiring portion of the motor side wiring 75. When the connector housing 76 of the motor side wiring 75 and the connector housing 72 of the box side wiring 71 are joined, the box side wiring 71 and the motor side wiring 75 are connected, and one system of torque sensor wire 77 is configured. Is done.

  As shown in FIG. 3, a rotation sensor wire 80 extending from the resolver stator 39 of the rotation sensor 40 is disposed in the electric motor 12. The second motor outer wiring portion of the motor side wiring 75 is bundled with the rotation sensor wire 80 and is drawn out from a common wire hole 81 formed in the flange 21 of the electric motor 12. The motor-side wiring 75 of the torque sensor wire 77 and the lead-out end of the rotation sensor wire 80 drawn out from the through hole 81 are connected to one connector housing 82, which is not shown in the drawing. It is connected to the connector housing of the harness extending from.

  2 and 3, the motor side wiring 75 and the rotation sensor line 80 of the torque sensor line 77 are inserted into a rubber sensor grommet 83, and the sensor grommet 83 is fitted into the through hole 81. Is done. As shown in FIG. 3, the motor side wiring 75 and the rotation sensor line 80 arranged between the sensor grommet 83 and the connector housing 82 are inserted into the protection tube 84 and bundled by the protection tube 84 to be protected. Is done.

  Here, as shown in FIG. 3, the resolver stator 39, the rotation sensor wire 80, the motor side wiring 75 of the torque sensor wire 77, the connector housing 76, the sensor grommet 83, the protective tube 84, and the connector housing 82 are assembled in advance. A bundle harness 85 is provided. The bundle harness 85 is incorporated in the electric motor 12 in advance when the electric motor 12 is assembled. When the bundle harness 85 is assembled in the electric motor 12, the first motor outer wiring portion of the motor side wiring 75 and the connector housing 76 are pulled out from the through hole 49, and the rotation sensor wire 80 and the second motor side wiring 75 are second. The motor outer wiring portion, the protective tube 84 and the connector housing 82 are pulled out from the wire hole 81. When the gear box 13 is attached to the electric motor 12, the connector housing 76 of the motor side wiring 75 and the connector housing 72 of the box side wiring 71 are coupled, and in a state where these are connected, the gear box is connected to the electric motor 12. 13 will be attached.

  In the electric power steering apparatus 10 according to the embodiment described above, the end portion of the torque sensor wire 77 drawn out to the electric motor 12 side of the box side wiring 71 arranged on the gear box 13 side, and the torque sensor wire 77. The end of the motor-side wiring 75 arranged on the electric motor 12 side and drawn to the gear box 13 side is connected, and the electric motor 12 and the gear box 13 are connected. In this state, since the second motor outer wiring portion of the motor-side wiring 75 and the rotation sensor wire 80 are drawn out from the common wire hole 81 of the electric motor 12 in the same bundle state, the two systems Lines (torque sensor line 77 and rotation sensor line 80) can be grouped together.

  Therefore, it is not necessary to strictly manage the dimensions of the parts, and the structure is not complicated. Therefore, the workability during wiring can be improved while suppressing the cost increase, and the mounting on the vehicle is improved by improving the harness layout. it can. Moreover, since the torque sensor wire 77 and the rotation sensor wire 80 can be disposed in the housing, the harness can be simplified.

  Further, in the electric power steering apparatus 10 according to the embodiment described above, the torque sensor wire 77 and the rotation sensor wire 80 drawn from the through hole 81 are connected to one connector housing 82. For this reason, the torque sensor wire 77 and the rotation sensor wire 80 can be simultaneously connected to the connection destination by connecting the connector housing 82 to the connection destination.

  In the above embodiment, the torque sensor wire 77 (motor side wiring 75) and the rotation sensor wire 80 are inserted into the protective tube 84 and bundled. However, the torque sensor wire 77 and the rotation sensor wire are shown. For the purpose of preventing a short circuit with 80 and a short circuit between the torque sensor wires 77, a protection tube 78 for protecting the torque sensor wire 77 can be provided separately as shown in FIG. By protecting the torque sensor wire 77 with the protective tube 78 as described above, the above-described short circuit can be prevented, and damage to the torque sensor wire 77 during wiring or vibration can be prevented.

1 is a partial cross-sectional view of an electric motor and a gear box of an electric power steering apparatus according to an embodiment of the present invention. It is a perspective view which shows the state before the connection of the electric motor and gearbox of the electric power steering apparatus shown in FIG. FIG. 2 is a plan view of a bundle harness of the electric power steering apparatus shown in FIG. 1. It is a top view which shows the example which provided the protection tube in the torque sensor wire | line of the bundle | flux harness shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Electric power steering apparatus, 12 ... Electric motor, 13 ... Gear box, 40 ... Rotation sensor, 52 ... Opposite surface to gear box (55) of electric motor, 55 ... Reduction mechanism, 64 ... Electric motor (of gear box) 65 ... torque sensor, 71 ... box side wiring, 75 ... motor side wiring, 77 ... torque sensor wire, 80 ... rotation sensor wire, 81 ... through hole, 82 ... connector housing.

Claims (2)

An electric power that couples an electric motor with a built-in rotation sensor and a gear box with a built-in speed reduction mechanism and torque sensor, and decelerates the rotation of the electric motor with the speed reduction mechanism to give a steering assist torque to a vehicle steering system A steering device,
A torque sensor wire that is connected to the torque sensor and includes a box side wiring disposed on the gear box side and a motor side wiring disposed on the electric motor side;
The box side wiring includes one end connected to the torque sensor and an in-box wiring portion disposed in the gear box, and is connected to the in-box wiring portion from a surface facing the electric motor of the gear box. And a wiring part outside the box including the other end pulled out to the electric motor side,
The motor side wiring is connected to the motor internal wiring portion arranged in the electric motor, and is connected to the motor internal wiring portion, and is drawn out to the gear box side from the surface facing the gear box of the electric motor. A first motor outer wiring portion including one end connected to the side wiring, and a second end connected to the motor inner wiring portion and the rotation sensor wire disposed in the electric motor, and the other end drawn from a common through hole. A second motor outer wiring portion,
Electric power steering device. The second motor outer wiring portion of the torque sensor wire drawn from the through hole and the rotation sensor wire are connected to one connector housing.
The electric power steering apparatus according to claim 1.

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