JP2006232183A - Electric power steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric power steering device capable of providing larger steering assist force, preventing increase in the number of parts and miniaturizing the device itself. <P>SOLUTION: First and second worm shafts 6, 7 provided on first and second electric motors 8, 9 are engaged with a worm wheel 5 connected to a steering wheel 1 through a steering shaft 3 in such a way as to pressurize it on the worm wheel at a prescribed angle. Rotation of the steering shaft 3 and the steering wheel 1 is assisted through the worm wheel 5 by rotating the first and second worm shafts 6, 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric power steering apparatus capable of obtaining a larger steering assist force.

  As a conventional electric power steering device, for example, a device described in Patent Document 1 below has been proposed.

  The electric power steering apparatus includes a steering shaft connected to a steering wheel, and a worm wheel coupled to the steering shaft. The worm wheel is rotated by a worm shaft provided in an electric motor, and the steering shaft The traveling direction of the vehicle is changed by moving the rack bar in the axial direction via the wheel.

The apparatus includes two worm wheels coupled to the steering shaft, and first and second worm shafts that mesh with the worm wheels, respectively. Is rotated to apply a steering assist force to the steering shaft via the two worm wheels. Thus, since the steering shaft is rotated by the first and second worm shafts, a larger steering assist force can be obtained.
Japanese Patent Laid-Open No. 7-172326

  However, since the electric power steering apparatus uses the two worm wheels, the number of parts increases and the structure becomes complicated, and the two worm wheels are arranged in parallel at a predetermined interval in the axial direction. There is a problem that the axial dimension of the apparatus becomes large.

  The present invention has been made paying attention to such a problem, and provides an electric power steering apparatus that prevents an increase in the number of parts of the electric power steering apparatus and allows the apparatus to be miniaturized. is there.

  According to the first aspect of the present invention, there is provided a steering shaft connected to the steering wheel, steering state detection means for detecting a steering state of the steering wheel as the steering shaft rotates, and a single unit coupled to the steering shaft. A worm wheel, a first worm shaft that meshes with the worm wheel, a first electric motor that applies a steering assist torque to the steering shaft via the first worm shaft and the worm wheel, and meshes with the worm wheel. A second worm shaft; a second electric motor that applies a steering assist torque to the steering shaft via the second worm shaft and the worm wheel; and the first electric motor and the second electric motor based on an output signal of the steering state detecting means. And a control circuit for controlling two electric motors.

  According to the present invention, since the worm wheel is unified and one worm wheel is rotated by the first and second worm shafts, a larger steering assist force is obtained and an increase in the number of parts is prevented. In addition, the electric power steering device can be miniaturized.

  The invention described in claim 2 is characterized in that the first worm shaft and the second worm shaft are arranged at a predetermined angle which is not parallel to each other when meshed with the worm wheel.

  According to the present invention, the first and second worm shafts are arranged at a predetermined angle that is not parallel to each other in a state where the first worm shaft and the second worm shaft are engaged with the worm wheel, respectively. When pressed against the worm wheel, the worm wheel is pushed in the radial direction so as to be pushed out by the first and second worm shafts.

  As a result, since the space between the tooth portion of the worm wheel and the tooth portion of the first and second worm shafts can be adjusted, the tooth portions are not in close contact with each other, and the backlash amount between the tooth portions is kept moderate. For example, occurrence of abnormal noise can be prevented.

  The invention according to claim 3, wherein the worm wheel has a plurality of teeth on the outer periphery and a disc-shaped gear body having a plurality of through holes penetrating in the axial direction, and is accommodated in each of the through holes. A cylindrical elastic member formed, coupling members disposed on both sides in the axial direction of the gear main body, a connecting member that passes through the elastic members and connects the coupling members while sandwiching the gear main body. It is characterized by providing.

  According to the present invention, the elastic member is housed in the gear body and is fitted over the entire circumference of the connection member, so that the worm wheel is radial from the first and second worm shafts. When receiving this force, the elastic member can positively move in the radial direction by the elastic force of the elastic member.

  As a result, the amount of backlash between the worm wheel and the first and second worm shafts can be adjusted effectively, and for example, the generation of noise due to an increase in the amount of backlash can be further prevented. In addition, since the worm wheel is movable in the radial direction, machining errors and assembly errors of each part can be absorbed.

  Embodiments of an electric steering apparatus according to the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the electric power steering apparatus has a steering shaft 3 having one end connected to the steering wheel 1 and the other end housed in a pinion housing 2, and an outer periphery of the steering shaft 3. A single worm wheel 5 coupled, first and second worm shafts 6 and 7 meshing with the worm wheel 5, and the steering shaft 3 via the first and second worm shafts 6 and 7 and the worm wheel 5. First and second electric motors 8 and 9 for applying steering assist torque to the motor, a sensor 10 provided on the outer peripheral portion of the steering shaft 3 and detecting the rotation angle of the steering shaft 3, and the sensor 10 And a control circuit 11 for controlling the first and second electric motors 8 and 9 on the basis of the output signal.

  A rack bar 15 is accommodated in a vehicle width direction in a rack housing 14 provided at a lower portion of the pinion housing 2, and a pinion shaft (not shown) is connected to the steering shaft 3.

  A right front wheel FR is connected to one end of the rack bar 15 via a knuckle arm 16, and the rack bar 15 meshes with a pinion shaft like a helical gear, and the steering shaft 3 rotates. The rack bar 15 moves in the axial direction. A left front wheel (not shown) is similarly connected to the other end.

  In the first and second electric motors 8 and 9, the assist amount for the worm wheel 5 is controlled by the output signal from the control circuit 11, respectively. Since the first and second electric motors 8 and 9 have substantially the same structure, only the first electric motor 8 will be described.

  As shown in FIG. 2, the first electric motor 8 includes a first worm shaft 6 that is rotatably supported, a cylindrical rotor 18 that is fixed to an outer peripheral portion of the first worm shaft 6, and the rotor 18. And an annular stator 19 that rotates by exciting the first worm shaft 6 and an annular first rotation angle sensor 20 that detects the amount of rotation of the first worm shaft 6 as the first worm shaft 6 rotates. Yes. A winding coil portion 25 is provided on the inner peripheral side of the stator 19.

  The rotor 18 has a magnet rotor 24 on the outer peripheral side, and the magnet rotor 24 is rotated by being excited from the coil portion 25 of the stator 19.

  The first rotation angle sensor 20 is fixed to the housing 26 so as to surround the detected portion 28 and the annular detected portion 28 that rotates together with the first worm shaft 6, and the rotation of the detected portion 28. It is composed of an annular sensor coil portion 29 that detects a corner. The second electric motor 9 is provided with a second rotation angle sensor 21.

  The first worm shaft 6 is supported at its one end side and axial center by annular bearings 30 and 31 in the first electric motor 8 to form a so-called cantilever support structure.

  Here, the first and second worm shafts 6, 7 are respectively engaged with the worm wheel 5, for example, having an acute angle of approximately 30 ° with each other and arranged on substantially the same plane as the worm wheel 5. Has been.

  Specifically, the first and second worm shafts 6, 7 meshing with the worm wheel 5 have different phases, and the wheel tooth portion 5 a provided on the outer peripheral portion of the worm wheel 5 includes the first worm shaft 6. Is arranged so that the trough portion 5b between the wheel tooth portions 5a is orthogonal to the second worm shaft 7.

  When the first and second worm shafts 6 and 7 are pressed against the worm wheel 5, the worm wheel 5 is pressed from the a direction and the b direction, and is urged in the c direction. .

  The first and second worm shafts 6 and 7 may not be parallel to each other in a state of being engaged with the worm wheel 5. Moreover, the structure by which any one of said 1st, 2nd electric motors 8 and 9 is arrange | positioned in the substantially symmetrical position centering | focusing on the meshing part of shaft tooth part 6a, 7a and wheel tooth part 5a may be sufficient.

  As shown in FIGS. 3 and 4, the worm wheel 5 includes a disk-shaped gear body 35 in which a plurality of through-hole bolt holes 34 are formed, and a cylindrical elastic body accommodated in each bolt hole 34. A rubber tube 36 as a member, first and second flanges 37 and 38 as connecting members arranged so as to sandwich the gear body 35 on both sides in the axial direction of the gear body 35, and the rubber tubes 36 are inserted. And bolts 40 and 41 which are connecting members for connecting the first and second flanges 37 and 38 to each other.

  As shown in FIGS. 3 and 4, the gear body 35 is made of, for example, resin, and has eight bolt holes 34 penetrating in the axial direction at substantially equal intervals in the circumferential direction. A wheel tooth portion 5a is formed. A gear center hole 43 through which the steering shaft 3 is inserted is formed at the center.

  The first flange 37 is formed in a disc shape, and a central hole 45 through which the steering shaft 3 is inserted is formed at the center. Further, four bolt insertion holes 46 penetrating in the axial direction are formed at substantially equal intervals in the circumferential direction of the first flange 37, and the bolt insertion holes 46 are also formed at substantially equal intervals in the circumferential direction. Four nut portions 47 to be fastened to each bolt 41 are also formed. That is, the bolt insertion holes 46 and the nut portions 47 are alternately formed at substantially equal intervals.

  On the other hand, the second flange 38 has a cylindrical portion 52 in which a disc portion 50 having substantially the same diameter as the first flange 37 and a central hole 51 through which the steering shaft 3 is inserted are formed in the central portion of the disc portion 50. Are integrated. In addition, four bolt insertion holes 53 penetrating in the axial direction are formed at substantially equal intervals in the circumferential direction of the disk portion 50, and the bolts 40 are also formed at substantially equal intervals in the circumferential direction. Four nut portions 54 to be fastened are formed.

  The cylindrical portion 52 is formed with a reduced diameter portion 52a at the tip, and the outer diameter of the cylindrical portion 52 is slightly smaller than the inner diameter of the gear central hole 43, while the outer diameter of the reduced diameter portion 52a. The diameter is approximately the same as the inner diameter of the central hole 45 of the first flange 37. As a result, a gap L <b> 1 is formed between the outer peripheral surface of the cylindrical portion 52 and the inner peripheral surface of the gear central hole 43, and the reduced diameter portion 52 a is in contact with the peripheral portion of the central hole 45.

  The bolts 40 and 41 are formed with screw portions 56a and 57a at the tip portions of the shaft portions 56 and 57, respectively, and in the vicinity of the screw heads, the diameter-enlarged portions are larger than the shaft portions 56 and 57. 56b and 57b are formed.

  Since the bolts 40 and 41 are formed in substantially the same shape, only the structure of the bolt 40 will be described below.

  The outer diameter of the enlarged diameter portion 56 b is smaller than the inner diameter of the bolt hole 34 of the gear body 35 and is formed to be approximately the same as the inner diameter of the bolt insertion hole 46 of the first flange 37. As a result, a gap L2 is formed between the outer peripheral surface of the enlarged diameter portion 56b and the inner peripheral surface of the bolt hole 34, and the outer peripheral surface of the enlarged diameter portion 56b is the inner peripheral surface of the bolt insertion hole 46. Abut.

  And since the screw part 56a formed in the front-end | tip part of each said volt | bolt 40 is fastened by each said nut part 54, the said gear main body 35 is hold | maintained by the said 1st, 2nd flanges 37 and 38 in the clamping state. Yes.

  Each rubber tube 36 is penetrated so as to be in close contact with the shaft portion 56 of each bolt 40, and rotates together with the bolt 40 when the bolt 40 is fastened to the nut portion 54. . The length of each rubber tube 36 in the axial direction is smaller than the length of the gear body 35 in the axial direction, and the outer diameter of each rubber tube 36 is the outer diameter of the expanded portion 56b of the bolt 40. And is in contact with the inner peripheral surface of the bolt hole 34.

  Hereinafter, the operation at the time of steering in the electric power steering apparatus of the present embodiment will be described.

  When the steering wheel 1 is steered, as shown in FIG. 1, the steering shaft 3 rotates, the sensor 10 detects the rotation angle of the steering shaft 3, and the data is output to the control circuit 11 as an output signal. Sent. Based on the output signal of the sensor 10, the control circuit 11 controls the output torque of the first and second electric motors 8 and 9, and the rotation amount of the first and second worm shafts 6 and 7 is controlled.

  The first and second rotation angle sensors 20 and 21 provided in the first and second electric motors 8 and 9 detect the rotation amounts of the first and second worm shafts 6 and 7, respectively. The rotation amount data of the worm shafts 6 and 7 and the rotation angle data of the steering shaft 3 are transmitted to the control circuit 11 as output signals.

  Based on this output signal, the control circuit 11 controls the assist amount of the first and second electric motors 8 and 9, that is, continuously controls the rotation amount of the first and second worm shafts 6 and 7, The rotation angle of the worm wheel 5 meshing with the shafts 6 and 7 is also controlled.

  Here, as described above, the first worm shaft 6 and the second worm shaft 7 mesh with the worm wheel 5 at an acute angle. That is, when the first and second worm shafts 6, 7 are pressed against the worm wheel 5, the worm wheel 5 is pressed from the a direction and the b direction, so that it is biased in the c direction.

  By energizing the worm wheel 5 in the c direction, the gap between the wheel tooth portion 5a of the worm wheel 5 and the shaft tooth portions 6a and 7a of the first and second worm shafts 6 and 7 can be adjusted. When the worm wheel 5 rotates, the shaft teeth 6a, 7a and the wheel teeth 5a are not in close contact with each other, and the amount of backlash is maintained moderately. can do.

  As shown in FIG. 4, the cylindrical portion 52 of the second flange 38 and the gear central hole 43 of the gear body 35, and the enlarged diameter portion 56 b of the bolt 40 and the bolt hole 34 of the gear body 35 are shown. In addition, gaps L1 and L2 are respectively formed over the entire circumference, and the bolt hole is not affected even if the inner peripheral surface of the gear central hole 43 is urged toward the cylindrical portion 52 by a force from the a and b directions. The inner peripheral surface of 34 is in pressure contact with the outer peripheral surface of the rubber tube 36, so that the rubber tube 36 can reliably exhibit an elastic effect.

  As described above, since the rubber tube 36 is accommodated in the bolt hole 34 of the gear body 42, the worm wheel 5 is more easily moved in the radial direction. Can be prevented. Further, when the worm wheel 5 moves in the radial direction, machining errors and assembly errors of each part can be absorbed.

  Further, since the worm wheel 5 is made of a synthetic resin, even if the timing and the magnitude of the torque applied between the first worm shaft 6 and the second worm shaft 7 are different, the error is corrected. Therefore, the worm wheel 5 can be assisted smoothly.

  If the first and second worm shafts 6 and 7 are not parallel to each other, the worm wheel 5 can move in the radial direction, and the same effect can be obtained.

  In addition, the rubber tube 36 is not limited to be accommodated in the bolt hole 34, and if an elastic member is provided between the steering shaft 3 and the wheel tooth portion 5a, the worm wheel 5 can move in the radial direction. Therefore, the same effect can be obtained.

  In addition, since the phases of the meshing state of the worm wheel 5 and the first worm shaft 6 and the meshing state of the worm wheel 5 and the second worm shaft 7 are different, when the worm wheel 5 is rotated, The meshing timing can be shifted. As a result, it is possible to prevent resonance of vibrations generated from the torques of the first and second worm shafts 6 and 7 and to prevent generation of abnormal noise.

  FIG. 5 is a relationship diagram of the assist amounts of the first and second electric motors 8 and 9 with respect to the steering torque of the steering wheel 1, and the horizontal axis represents the steering torque that is the steering force of the steering wheel 1. The vertical axis indicates the assist amount of the first and second electric motors 8 and 9 with respect to the worm wheel 5, that is, the output torque of the first and second electric motors 8 and 9. Further, the thin solid line indicates the first motor 8, the thick solid line indicates the second motor 9, and the broken line indicates the total assist amount of the first and second motors 8 and 9, respectively.

  When the steering wheel 1 is not steered and the vehicle is traveling straight, that is, when the steering torque is 0 (point A in the figure), the worm wheel 5 receives an output signal from the control circuit 11. The first electric motor 8 and the second electric motor 9 are assisted in the reverse rotation direction with substantially equal assist amounts.

  When the steering wheel 1 is rotated to the right, first, the assist amount of the first electric motor 8 increases until reaching point B in proportion to the magnitude of the steering torque.

  Here, the second motor 9 assists the worm wheel 5 in the reverse rotation direction with the same assist amount as the point A until the assist amount of the first motor 8 reaches the point B, and the assist amount of the first motor 8 is the upper limit. And the second electric motor 9 starts assisting the worm wheel 5 in the same rotational direction as the first electric motor 8.

  When the steering wheel 1 is rotated counterclockwise, the assist amount of the second electric motor 9 is first increased in proportion to the magnitude of the steering torque, contrary to the case of rotating the steering wheel 1 to the right. The assist amount 9 becomes the upper limit and becomes a constant value, and the first electric motor 8 starts to assist in the same rotation direction.

  In other words, when the steering wheel 1 is rotated to the right, the first electric motor 8 is set to assist the worm wheel 5 dynamically, and the second electric motor 9 is set to assist the worm wheel 5 passively. Yes. On the other hand, when the steering wheel 1 is rotated counterclockwise, the second electric motor 9 is set to actively assist the worm wheel 5, and the first electric motor 9 is set to assist the worm wheel 5 passively. Yes.

  When the steering torque of the steering wheel 1 is 0, the assist amount for the worm wheel 5 of the first and second worm shafts 6 and 7 provided in the first and second electric motors 8 and 9 is offset. . Since the worm wheel 5 is rotated in the opposite direction, the first and second shaft tooth portions 6a and 7a of the first and second worm shafts 6 and 7 are in close contact with each other so as to be pressed against the wheel tooth portion 5a. In addition, the rotation of the worm wheel 5 can be restricted and the swinging of the steering wheel 1 connected to the worm wheel 5 via the steering shaft 3 can be effectively prevented.

  The control circuit 11 controls the worm wheel 5 so that one of the first electric motor 8 and the second electric motor 9 is assisted dynamically and the other is driven assisted, that is, the output torque is different. Thus, the first and second shaft tooth portions 6a and 7a are in close contact with each other so as to be pressed against the wheel tooth portion 5a, so that the torque of the first and second worm shafts 6 and 7 can be prevented from resonating.

  In this embodiment, since the single worm wheel 5 is rotated by the two first and second worm shafts 6 and 7, a larger steering assist force can be obtained and an increase in the number of parts can be prevented. In addition, the electric power steering device can be reduced in size.

  The first and second worm shafts 6 and 7 have substantially the same shape, and the first and second electric motors 8 and 9 have substantially the same size. Therefore, it is possible to use common parts, respectively, and electric power steering. The manufacturing cost of the apparatus can be reduced.

  Further, since the one end portion side and the axial center portion of the first and second worm shafts 6 and 7 are respectively supported by the cantilever support structure, as a result, for example, the tips of the first and second worm shafts 6 and 7 are provided. The parts can be brought close to each other, and the structural freedom is improved.

  The assist amount of the first electric motor 8 is increased when the steering wheel 1 is rotated to the right, and the assist amount of the second electric motor 9 is increased when the steering wheel 1 is rotated to the left. Thus, the usage frequency of the first and second electric motors 8 and 9 becomes average.

  The technical ideas other than the invention described in the claims, as grasped from the embodiment, will be described below.

  The electric power steering apparatus according to any one of claims 1 to 3, wherein an elastic member is provided between the steering shaft and a tooth portion of the worm wheel.

  According to the present invention, the elastic member is provided between the steering shaft and the tooth portion of the worm wheel, so that the worm wheel is positively activated when receiving a radial force from the first and second worm shafts. It can move in the radial direction. As a result, the amount of backlash between the worm wheel and the first and second worm shafts can be adjusted effectively, and for example, abnormal noise due to an increase in the amount of backlash can be further prevented. Further, since the worm wheel can be moved in the radial direction by the elastic member, it is possible to absorb processing errors and assembly errors of the respective parts.

  (2) The electric power steering device according to any one of (1) to (1), wherein the first worm shaft and the second worm shaft are pressed against the worm wheel.

  According to this invention, the first worm shaft and the second worm shaft are pressed against the worm wheel, thereby preventing the backlash amount between the tooth portions from increasing and preventing the generation of abnormal noise due to the backlash. can do.

  (3) The electric power steering device according to any one of (1) to (2), wherein the worm wheel is formed of resin.

  According to the present invention, even when the timing and magnitude of torque applied to the first and second worm shafts are different because the worm wheel is molded from resin, the error is absorbed by the elastic force of the resin worm wheel. Therefore, the worm wheel can be assisted smoothly.

  (1) The first worm shaft and the second worm shaft are formed in substantially the same shape, and the first electric motor and the second electric motor are formed in the same size. The electric power steering device according to any one of the above.

  According to the present invention, since common parts are used for the first and second worm shafts and the first and second electric motors, the manufacturing cost can be reduced.

  (5) One end portions of the first worm shaft and the second worm shaft have cantilever support structures supported by the first electric motor and the second electric motor, respectively. (4) The electric power steering apparatus according to any one of (4).

  Since the first and second worm wheels have cantilevered support structures that are supported by the first and second motors, respectively, the first and second worm shafts have a structure in which the other end is not supported by the bearing. It is possible to arrange the other end portions close to each other, and the degree of freedom in structure is improved.

  (6) The meshing state of the first worm shaft and the worm wheel is set so that the phase is different from the meshing state of the second worm shaft and the worm wheel. (5) The electric power steering device according to any one of (5).

  According to the present invention, the engagement state of the first worm shaft and the worm wheel is set so that the phase is different from the engagement state of the second worm shaft and the worm wheel. Since the meshing timing can be shifted, resonance between both worm shafts can be prevented.

  (7) The electric circuit according to any one of (1) to (6), wherein the control circuit outputs a control signal so that output torques of the first electric motor and the second electric motor are different. Power steering device.

  According to the present invention, since the control circuit outputs the control signal so that the output torques of the first and second motors are different from each other, for example, one of the first motor or the second motor mainly drives the worm wheel. The first and second worm shaft teeth are pressed against the tooth portions of the worm wheel by setting the assist and the other to follow the worm wheel in a passive manner. It is possible to prevent the torque of the worm shafts 6 and 7 from resonating.

  (8) When the steering state detecting means detects that the vehicle is traveling straight, the control circuit causes the first worm shaft and the second worm shaft to rotate the worm wheels in different directions. The electric power steering apparatus according to any one of claims 1 to 7, wherein the control signal is output as described above.

  According to the present invention, when the steering state detecting means detects that the vehicle is traveling straight, the first and second worm shafts rotate by rotating the worm wheels in different directions. Since the rotation of the worm wheel can be regulated such that the tooth portion of the worm wheel and the tooth portion of the worm wheel are in close contact with each other, the swing of the steering wheel connected to the worm wheel via the steering shaft can be prevented.

1 is a perspective view of an electric power steering apparatus according to the present invention. It is an expanded sectional view which follows the AA line of FIG. It is a disassembled perspective view of the worm wheel of FIG. It is an expanded sectional view which follows the BB line of FIG. It is the figure which showed the relationship between the steering torque of a steering wheel, and the assist amount to the worm wheel of a 1st, 2nd electric motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Steering wheel 3 ... Steering shaft 5 ... Worm wheel 5a ... Wheel tooth part 6 ... 1st worm shaft 7 ... 2nd worm shaft 8 ... 1st electric motor 9 ... 2nd electric motor 10 ... Sensor (steering state detection means)
11 ... Control circuit 34 ... Bolt hole (through hole)
35 ... Gear body 36 ... Rubber tube (elastic member)
37 ... 1st flange (connection member)
38 ... 2nd flange (connecting member)
40 ... Bolt (connection member)
41 ... Bolt (connection member)

Claims (3)

A steering shaft connected to the steering wheel;
Steering state detection means for detecting the steering state of the steering wheel as the steering shaft rotates;
A single worm wheel coupled to the steering shaft;
A first worm shaft meshing with the worm wheel;
A first electric motor for applying a steering assist torque to the steering shaft via the first worm shaft and the worm wheel;
A second worm shaft meshing with the worm wheel;
A second electric motor for applying a steering assist torque to the steering shaft via the second worm shaft and the worm wheel;
An electric power steering apparatus comprising: a control circuit that controls the first electric motor and the second electric motor based on an output signal of the steering state detecting means.   2. The electric power steering apparatus according to claim 1, wherein the first worm shaft and the second worm shaft are arranged at a predetermined angle that is not parallel to each other when meshed with the worm wheel. The worm wheel is
A disc-shaped gear body having a plurality of teeth on the outer periphery and having a plurality of through holes penetrating in the axial direction;
A cylindrical elastic member accommodated in each through hole;
Connecting members disposed on both axial sides of the gear body;
The electric power steering device according to claim 1, further comprising: a connecting member that is inserted through each of the elastic members and connects the connecting members while sandwiching the gear main body.

Images