WO2021014785A1

WO2021014785A1 - Steering device

Info

Publication number: WO2021014785A1
Application number: PCT/JP2020/022231
Authority: WO
Inventors: 幸二沼倉; 高太郎椎野
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2019-07-22
Filing date: 2020-06-05
Publication date: 2021-01-28
Also published as: JP2021017146A

Abstract

A steering device wherein a motor shaft of an electric motor is formed separate from a motor pulley shaft of a motor pulley, and is capable of connecting to and separating from the motor pulley shaft.

Description

Steering device

The present invention relates to a steering device.

Patent Document 1 discloses a steering device that transmits the driving force of an electric motor to a ball screw mechanism via a motor pulley, an endless belt, and a nut pulley, and converts it into an axial thrust of a steering shaft.

JP-A-2018-119583

However, in the steering device described in Patent Document 1, when the electric motor is removed from the gear housing, the tension of the endless belt is loosened, so that there is a problem that the tension must be readjusted every time the electric motor is replaced or maintained. It was.
One of an object of the present invention is to provide a steering device that does not require readjustment of the tension of the endless belt.

In the steering device according to the embodiment of the present invention, the motor shaft of the electric motor is formed separately from the motor pulley shaft portion of the motor pulley, and can be connected to and separated from the motor pulley shaft portion.

Therefore, in one embodiment of the present invention, the tension of the endless belt is maintained even if the electric motor is removed from the gear housing, so that the tension of the endless belt does not need to be readjusted.

It is a figure which looked at the steering device 1 of Embodiment 1 from the front side of a vehicle. It is sectional drawing of the main part of the steering apparatus 1 of Embodiment 1. FIG. It is a perspective view of the adapter member 7 of Embodiment 1. FIG. It is the figure which looked at the adapter member 7 and the electric motor 9 from the X-axis negative direction side. It is the figure which looked at the adapter member 7 before centering from the X-axis positive direction side. It is the figure which looked at the adapter member 7 after centering from the X-axis positive direction side. It is a figure which shows the state which removed the electric motor 9 from the gear housing 5. It is sectional drawing of the main part of the steering apparatus 100 of Embodiment 2. It is sectional drawing of the main part of the steering apparatus 101 of Embodiment 3. It is sectional drawing of the main part of the steering apparatus 102 of Embodiment 4. It is sectional drawing of the main part of the steering apparatus 103 of Embodiment 5.

[Embodiment 1]
FIG. 1 is a view of the steering device 1 of the first embodiment as viewed from the front side of the vehicle, and FIG. 2 is a cross-sectional view of a main part of the steering device 1 of the first embodiment.
The steering device 1 of the first embodiment includes a steering mechanism 2 and an assist mechanism 3. The steering mechanism 2 transmits the rotation of the steering wheel rotated by the driver to the rack bar (steering shaft) 4. The steering mechanism 2 includes a steering shaft 2a connected to the steering wheel and a pinion shaft (not shown) having a pinion that meshes with the rack teeth of the rack bar 4. The steering shaft 2a and the pinion shaft are connected by a torsion bar. The assist mechanism 3 imparts an assist force to the rack bar 4 to reduce the steering load of the driver. The steering mechanism 2 and the assist mechanism 3 are housed inside the gear housing 5. The gear housing 5 has a gear housing main body 6 and an adapter member 7.

The gear housing main body 6 has a rack bar accommodation space (steering shaft accommodation space) 6a and a reduction gear accommodation space 6b inside. The rack bar accommodating space 6a accommodates the rack bar 4 so as to be movable in the longitudinal direction thereof. The speed reducer accommodating space 6b is arranged in the intermediate portion in the longitudinal direction of the rack bar accommodating space 6a, and accommodates the reducer described later. The rack bar 4 has a rack bar main body (steering shaft main body) 4a and a rack bar ball screw groove (steering shaft ball screw groove) 4b. The rack bar main body 4a has a round bar shape, and the front wheels (steering wheels) can be steered by moving the rack bar accommodating space 6a in the longitudinal direction of the rack bar main body 4a. The rack bar ball screw groove 4b is provided on the outer peripheral side of the rack bar main body 4a and has a spiral groove shape. The adapter member 7 is formed of a member separate from the gear housing main body 6, and is fixed to the gear housing main body 6. The adapter member 7 has a motor pulley shaft support portion 8 that rotatably supports the motor pulley 12, which will be described later, in the direction around the rotation axis O1 inside the speed reducer accommodating space 6b. Details of the adapter member 7 will be described later.

The assist mechanism 3 has an electric motor 9 and a ball screw mechanism 10. The output of the electric motor 9 is controlled by the electronic control unit (ECU) 11 according to the torsion bar torque (steering torque), vehicle speed, and the like. The ball screw mechanism 10 transmits the driving force of the electric motor 9 to the ball screw mechanism 10 via the motor pulley 12, the endless belt 13 and the nut pulley 14, and converts it into the axial thrust of the rack bar 4. The motor pulley 12, the endless belt 13 and the nut pulley 14 function as a speed reducer for the electric motor 9. The ball screw mechanism 10 has a nut 15 and a nut pulley 14. The nut pulley 14 is formed in a cylindrical shape surrounding the nut 15. The nut pulley 14 is fastened to the nut 15 by four bolts 16. The nut pulley 14 has a nut pulley belt winding portion 14a around which the endless belt 13 is wound.

The nut 15 is provided so as to be rotatable in the direction around the rotation axis O2 of the nut 15 inside the speed reducer accommodation space 6b. The rotation axis O2 is arranged parallel to the rotation axis O1 of the motor pulley 12. The nut 15 is rotatably supported by a ball bearing 17 with respect to the gear housing 5. The nut 15 has a nut body portion 15a and a nut ball screw groove 15b. The nut body portion 15a has a cylindrical shape, and the rack bar 4 penetrates inside the nut body portion 15a. The nut ball screw groove 15b is provided on the inner peripheral side of the nut body portion 15a and has a spiral groove shape. The space between the nut ball screw groove 15b and the rack bar screw groove 4b is a spiral ball moving passage 18. The ball moving passage 18 is filled with a plurality of balls 19. The plurality of balls 19 move in the ball moving passage 18 with the rotation of the nut 15 to move the rack bar 4 with respect to the nut 15 in the direction of the rotation axis O2 of the nut 15.

The endless belt 13 is a toothed belt having a belt tooth portion, and is wound between the nut pulley 14 and the motor pulley 12. The motor pulley 12 is provided so as to be rotatable in the direction around the rotation axis O1 inside the speed reducer accommodation space 6b. The motor pulley 12 is formed in a cylindrical shape, and has a motor pulley belt winding portion 12a on which an endless belt 13 is wound. The motor pulley shaft portion 20 is press-fitted inside the motor pulley 12. The motor pulley shaft portion 20 is formed in a round bar shape and penetrates the motor pulley 12. The motor pulley 12 rotates integrally with the motor pulley shaft portion 20 in the direction around the rotation axis O1. The motor pulley shaft portion 20 can be supported by the motor pulley shaft support portion 8 of the adapter member 7 in a state where tension is applied to the endless belt 13.

The electric motor 9 has a motor housing 21, a motor shaft 22, a motor rotor 23, and a motor stator 24. The motor housing 21 has a motor housing main body 25 and a motor element accommodating space 26. The motor housing main body 25 is fixed to the adapter member 7 of the gear housing 5. The motor element accommodating space 26 is provided inside the motor housing main body 25, and accommodates the motor shaft 22, the motor rotor 23, and the motor stator 24. The motor shaft 22 is supported by the motor housing 21 via two

ball bearings

27 and 28. The motor shaft 22 is provided so as to be rotatable in the direction around the rotation axis O1 inside the motor element accommodating space 26. The motor shaft 22 is arranged coaxially with the motor pulley shaft portion 20. The motor shaft 22 is formed separately from the motor pulley shaft portion 20, and can be connected to and separated from the motor pulley shaft portion 20 by a joint 39 described later. The motor shaft 22 is press-fitted into the motor rotor 23 so that the motor rotor 23 can rotate integrally with the motor shaft 22. The motor stator 24 is provided on the outer peripheral side of the motor rotor 23 and is fixed to the motor housing main body 25.

ECU 11 has an ECU housing 29 and two

control boards

30 and 31. The ECU housing 29 is fixed to the motor housing main body 25. The first control board 30 has a motor control circuit that calculates the target output of the electric motor 9 according to the assist control law. The second control board 31 has a motor drive circuit that controls the energized state of the electric motor 9 according to the calculated target output. Both

control boards

30 and 31 are electrically connected to the connector portion 32. Each terminal of the connector unit 32 can be connected to an external device, a battery, or the like.

Next, the configuration of the adapter member 7 will be described.
FIG. 3 is a perspective view of the adapter member 7 of the first embodiment. The adapter member 7 has an adapter member main body portion 7a and a motor pulley shaft support portion 8. The adapter member main body 7a has a substantially hat-shaped cross-sectional shape in the direction of the rotation axis O1. The adapter member main body 7a has a joint accommodating portion 38 inside. The joint accommodating portion 38 has a concave shape that opens in the direction of the electric motor 9 in the direction of the rotation axis O1. The joint accommodating portion 38 is formed so that its radius gradually increases toward the opening side. Therefore, the moldability is good when the adapter member 7 is formed by forging. The joint accommodating portion 38 accommodates the joint 39.

The adapter member main body 7a has an in-row portion 33 and a flange portion 34. Hereinafter, the X-axis is set in the direction of the rotation axis O1, and the direction from the flange portion 34 side to the in-row portion 33 side is defined as the X-axis positive direction. The inro portion 33 has a bottom portion 33a at the end on the positive direction side of the X axis, and is formed in a bottomed cylindrical shape that can be inserted into the adapter member insertion hole 5a of the gear housing 5. The adapter member insertion hole 5a has a shape in which the adapter member 7 can rotate when the adapter member 7 (in-row portion 33) is inserted (gap fitting) and the adapter member main body portion 7a is not fixed to the gear housing 5. Has. Here, the central axis of the in-row portion 33 is eccentric with respect to the rotation axis O1. Therefore, by rotating the adapter member 7 in a state of being inserted into the adapter member insertion hole 5a, the relative position of the rotation axis O1 of the motor pulley 12 with respect to the rotation axis O2 of the nut pulley 14 can be adjusted. That is, the adapter member 7 includes a centering mechanism capable of adjusting the tension of the endless belt 13 by changing the distance between the axes of both

pulleys

12 and 14.

The flange portion 34 is formed in an annular shape that protrudes outward in the radial direction with respect to the central axis of the inrow portion 33 from the end portion of the inrow portion 33 on the negative direction side of the X axis. The flange portion 34 is provided with two elongated holes 34a, three screw holes 34b, and two jig insertion holes 34c. The two elongated holes 34a penetrate in the X-axis direction, and the three screw holes 34b and the three jig insertion holes 34c open in the negative direction of the X-axis. FIG. 4 is a view of the adapter member 7 and the electric motor 9 as viewed from the negative direction side of the X-axis. In the circumferential direction with respect to the central axis of the in-row portion 33, the two elongated holes 34a and the two jig insertion holes 34c are arranged at equal intervals (180 ° intervals), while the three screw holes 34b are unequally spaced (18 ° intervals). It is arranged at 90 °, 120 °, 150 °). Further, the two elongated holes 34a, the two jig insertion holes 34c, and the three screw holes 34b are arranged at different positions in the circumferential direction with respect to the central axis of the inlay portion 33. Bolts for fixing the adapter member main body 7a to the gear housing 5 are inserted into the two elongated holes 34a. The two elongated holes 34a extend in the circumferential direction with respect to the central axis of the in-row portion 33. Bolts 40 for fixing the motor housing main body 25 to the adapter member main body 7a are tightened in the three screw holes 34b. The motor housing 21 has three bolt bosses 21b provided with bolt insertion holes at positions corresponding to the three screw holes 34b in the circumferential direction with respect to the central axis of the inro portion 33. The two jig insertion holes 34c are jigs (pins) for rotating the adapter member 7 when assembling the adapter member 7 to the gear housing 5 and positioning the adapter member 7 to adjust the tension of the endless belt 13. ) Is inserted.

Inside the flange portion 34 (inside the end portion of the adapter member 7 on the negative direction side of the X axis), the motor housing positioning insertion provided on the end surface of the motor housing 21 on the positive direction side of the X axis and projecting in the positive direction of the X axis. Part 21a is inserted (fitted in the gap). Of the inner peripheral surface of the flange portion 34, the portion that comes into contact with the motor housing positioning insertion portion 21a is an adapter member positioning portion 34d for positioning with the motor housing 21 in a cross section orthogonal to the X axis.
The motor pulley shaft support portion 8 has a bearing accommodating portion (second pulley shaft bearing accommodating portion) 33b, an arm portion 35, and a bearing accommodating portion (first end portion supporting portion) 35a. The bearing accommodating portion 33b is provided in the center of the bottom portion 33a and supports the main bearing (motor shaft bearing, second pulley shaft bearing) 36. At the X-axis positive end of the bearing accommodating portion 33b, an annular positioning portion 33c that protrudes inward in the radial direction with respect to the rotation axis O1 is provided. The positioning portion 33c abuts on the end face of the main bearing 36 on the X-axis positive direction side in the X-axis direction. The main bearing 36 rotatably supports the end portion (second end portion of the pulley shaft) 20a on the negative direction side of the X-axis of the motor pulley shaft portion 20. Since the bearing accommodating portion 33b opens in the negative direction of the X-axis, the main bearing 36 can be inserted into the bearing accommodating portion 33b from the negative direction side of the X-axis. The main bearing 36 is a bearing with a seal, and has a sealing function of preventing moisture from entering the inside of the motor housing 21 via the main bearing 36.

The arm portion 35 projects from the bottom portion 33a in the positive direction of the X-axis and is cantilevered and supported by the adapter member main body portion 7a. The arm portion 35 is arranged at a position closer to the rotation axis O2 of the nut pulley 14 than the rotation axis O1 of the motor pulley 12. The arm portion 35 is formed in a substantially L shape whose tip bends inward in the radial direction with respect to the rotation axis O1. The arm portion 35 is provided so as to pass through the inside of the endless belt 13. The arm portion 35 is formed so as not to come into contact with the endless belt 13 in a range in which the tension of the endless belt 13 can be adjusted, that is, in a rotatable range of the adapter member 7 with respect to the gear housing 5.
The bearing accommodating portion 35a is provided at the tip (bent portion) of the arm portion 35. The bearing accommodating portion 35a supports the tip bearing (first pulley shaft bearing) 37. The tip bearing 37 rotatably supports the end portion (first end portion of the pulley shaft) 20b on the X-axis positive direction side of the motor pulley shaft portion 20. The outer diameter of the tip bearing 37 is set smaller than the outer diameter of the motor pulley belt winding portion 12a.

Next, the configuration of the joint 39 will be described.
The joint 39 is provided inside the joint accommodating portion 38, and can connect the motor shaft 22 and the motor pulley shaft portion 20. The joint 39 is a universal joint that can be freely bent in the vertical and horizontal directions. The joint 39 is fixed to the end 20a on the negative side of the X-axis of the motor pulley shaft portion 20. The joint 39 has a concave shape that opens in the negative direction of the X-axis, and on the inner circumference thereof, an internal tooth that spline-fits with an external tooth formed at the end of the motor shaft 22 on the positive direction of the X-axis. Is provided. The joint 39 is provided so as to start spline fitting between the joint 39 and the motor shaft 22 before the insertion of the motor housing positioning insertion portion 21a into the joint accommodating portion 38 begins.

Next, among the manufacturing methods of the steering device 1 of the first embodiment, a method of assembling the adapter member 7 and the electric motor 9 to the gear housing 5 will be described.
The adapter member 7 is performed after the ball screw mechanism 10 and the nut pulley 14 are assembled to the gear housing 5 and the endless belt 13 is accommodated in the speed reducer accommodating space 6b. First, the adapter member assembly in which each component (tip bearing 37, main bearing 36, motor pulley shaft portion 20, joint 39) is attached to the adapter member 7 in advance is assembled. First, the outer ring of the tip bearing 37 is press-fitted into the bearing accommodating portion 35a. Subsequently, the motor pulley shaft portion 20 into which the motor pulley 12 is press-fitted is inserted from the X-axis negative direction side of the joint accommodating portion 38, and the end portion 20b on the X-axis positive direction side is press-fitted into the inner ring of the tip bearing 37. Next, the inner ring of the main bearing 36 is press-fitted into the end 20a on the negative side of the X-axis of the motor pulley shaft portion 20, and the outer ring is press-fitted into the bearing accommodating portion 33b. At this time, since the positioning portion 33c is provided at the end of the bearing accommodating portion 33b on the X-axis positive direction side, the main bearing 36 can be positioned in the X-axis direction. Finally, the end portion 20a of the motor pulley shaft portion 20 on the negative direction side of the X axis is press-fitted into the joint 39.

After assembling the adapter member assembly, insert the in-row portion 33 into the adapter member insertion hole 5a of the gear housing 5, and pass the motor pulley shaft support portion 8 inside the endless belt 13. At this time, the outer diameter of the bearing accommodating portion 35a that supports the tip bearing 37 is set so that the endless belt 13 and the bearing accommodating portion 35a do not interfere with each other when the motor pulley 12 is inserted into the endless belt 13. Specifically, the outer diameter of the bearing accommodating portion 35a is set smaller than the outer diameter of the motor pulley belt winding portion 12a. As a result, when the motor pulley shaft support portion 8 passes through the inside of the endless belt 13, contact of the bearing accommodating portion 35a with the endless belt 13 can be suppressed, and assembly workability can be improved.

Next, adjust the tension of the endless belt 13 by aligning the adapter member 7. FIG. 5 is a view of the adapter member 7 before alignment as viewed from the positive direction side of the X-axis. First, the bolt 41 is inserted into the two elongated holes 34a, and the adapter member 7 is temporarily tightened to the gear housing 5 so that the adapter member 7 can rotate using a jig. Next, the jig pins are inserted into the two jig insertion holes 34a, and the tension of the endless belt 13 is measured while rotating the adapter member 7. At this time, the motor pulley shaft support portion 8 swings inside the endless belt 13, but the motor pulley shaft support portion 8 does not come into contact with the endless belt 13 within a range in which the tension of the endless belt 13 can be adjusted. It is possible to prevent the pulley shaft support portion 8 from interfering with the endless belt 13 and making the tension unadjustable. FIG. 6 is a view of the adapter member 7 after alignment as viewed from the positive direction side of the X-axis. When the tension of the endless belt 13 reaches a desired value, the bolt 41 is fully tightened to fix the adapter member 7 to the gear housing 5. Since the adapter member 7 is provided with a centering mechanism capable of adjusting the tension of the endless belt 13 by changing the distance between the axes of the

pulleys

12 and 14, the tension adjustment work of the endless belt 13 can be facilitated.

After adjusting the tension of the endless belt 13, attach the electric motor 9 to the adapter member 7. Specifically, the electric motor 9 is brought closer from the negative side of the X-axis of the adapter member 7, the joint 39 and the motor shaft 22 are spline-fitted, and the motor housing positioning insertion portion 21a of the electric motor 9 is inserted into the adapter member 7. Insert into the joint housing 38. At this time, the joint 39 starts spline fitting between the joint 39 and the motor shaft 22 before the insertion of the motor housing positioning insertion portion 21a into the joint accommodating portion 38 begins. When the insertion of the motor housing positioning insertion portion 21a into the joint accommodating portion 38 starts, the connection state of the joint 39 cannot be visually recognized from the outside. Therefore, by adopting a structure in which the connection of the joint 39 is started first, the joint 39 can be connected. The electric motor 9 can be assembled while visually recognizing the start of connection from the outside.

The motor housing 21 has a cross section orthogonal to the X-axis due to the contact between the motor housing positioning insertion portion 21a and the adapter member positioning portion 34d by fitting the motor housing positioning insertion portion 21a with the inside of the flange portion 34. , Positioning with the adapter member 7 is performed. Here, the motor pulley shaft portion 20 is supported by the motor pulley shaft support portion 8 of the adapter member 7, while the motor shaft 22 is supported by the motor housing 21. Therefore, by positioning the adapter member 7 and the motor housing 21, it becomes easy to align the axes of the motor pulley shaft portion 20 and the motor shaft 22.

After inserting the motor housing positioning insertion part 21a into the joint housing part 38, the motor housing 21 is fastened and fixed to the adapter member 7 with three bolts 40. Here, the three screw holes 34b of the adapter member 7 into which the bolt 40 is tightened and the bolt insertion holes of the motor housing 21 into which the bolt 40 is inserted are unequally spaced in the circumferential direction with respect to the central axis of the inlay portion 33. It is arranged in. That is, the motor housing 21 can always be connected to the gear housing 5 only at a predetermined angle in the circumferential direction with respect to the central axis of the in-row portion 33. As a result, the position of the connector portion 32 provided in the motor housing 21 in the direction around the rotation axis 01 is defined, so that the harness connected to the connector portion 32 can be prevented from twisting more than necessary.

In the conventional steering device, the motor pulley is fixed and supported by the motor shaft of the electric motor. Therefore, when the electric motor is replaced or maintained at a dealer or a maintenance shop, if the electric motor is removed from the gear housing, the motor pulley is also removed and the tension of the endless belt is loosened. Therefore, in the conventional steering device, it is necessary to readjust the tension of the endless belt every time the electric motor is replaced or maintained. Re-adjustment of the tension of the endless belt at a dealer or the like may not be optimally adjusted due to variations in the skill level of workers and equipment, as compared with the factory shipment.

On the other hand, in the steering device 1 of the first embodiment, the motor shaft 22 of the electric motor 9 is formed separately from the motor pulley shaft portion 20 of the motor pulley 12, and is connected to and separated from the motor pulley shaft portion 20. Is possible. As shown in FIG. 7, the electric motor 9 can be removed from the gear housing 5 while leaving the motor pulley shaft portion 20 in the gear housing 5 by loosening the three bolts 40. At this time, since the motor pulley shaft portion 20 has a structure of being supported by the motor pulley shaft support portion 8 in a state where the tension of the endless belt 13 is applied, the endless belt even when the electric motor 9 is removed. 13 tensions are maintained. Therefore, even if the electric motor 9 is removed from the gear housing 5, the tension of the endless belt 13 is maintained, and there is no need to readjust the tension. As a result, the tension of the endless belt 13 is maintained at the optimum value at the time of shipment from the factory.

The gear housing 5 includes an adapter member 7 formed of a member separate from the gear housing main body 6, and the motor pulley shaft portion 20 is provided on the adapter member 7. As a result, the configuration of the gear housing main body 6 can be simplified, and the work of assembling the motor pulley shaft 20 to the motor pulley shaft support 8 becomes easy.
When the motor housing body 25 is not connected to the gear housing 5, the adapter member 7 can be fixed to the gear housing body 6 while maintaining the adjusted tension of the endless belt 13 by the centering mechanism. is there. As a result, the tension of the endless belt 13 can be maintained even when the motor housing main body 25 is removed from the gear housing 5 (not connected to the gear housing 5).

The adapter member 7 includes an adapter member main body 7a and a motor pulley shaft support 8, and the motor pulley shaft support 8 is connected to the adapter member main body 7a, and is connected to a pair of ends of the motor pulley shaft 20. Therefore, it is possible to support each of the end portion 20b farther from the electric motor 9 and the end portion 20a closer to the electric motor 9. That is, since both ends of the motor pulley shaft portion 20 are supported by the motor pulley shaft support portion 8, the amount of deflection of the motor pulley shaft portion 20 can be suppressed as compared with the case where the motor pulley shaft portion 20 is cantilevered. The transmission efficiency of the endless belt 13 can be improved.
The motor pulley shaft support portion 8 is provided so as to pass through the inside of the endless belt 13. As a result, as compared with the structure in which the motor pulley shaft support portion 8 passes through the outside of the endless belt 13, the space outside the endless belt 13 for the motor pulley shaft support portion 8 is not required, so that the size of the device can be suppressed. ..

The adapter member main body 7a has a joint accommodating portion 38, and the joint accommodating portion 38 has a concave shape that opens in the direction of the rotation axis O1 of the motor pulley shaft portion 20 toward the electric motor 9. , The joint 39 is housed in the joint accommodating portion 38, and the motor shaft 22 and the motor pulley shaft portion 20 can be connected to each other. By providing the joint 39 between the motor shaft 22 and the motor pulley shaft portion 20, the motor shaft 22 and the motor pulley shaft portion 20 can be connected to each other. Further, by providing the joint accommodating portion 38 accommodating the joint 39 in the adapter member main body portion 7a, it is possible to reduce the size of the device in the direction of the rotation axis O1 of the motor pulley shaft portion 20.

The joint 39 is a universal joint, and the motor housing 21 includes a motor housing positioning insertion portion 21a projecting toward the motor pulley shaft portion 20 in the direction of the rotation axis O1 of the motor pulley shaft portion 20, and an adapter member positioning portion 34d. Is formed on the inner peripheral surface of the joint accommodating portion 38, and the motor housing positioning insertion portion 21a is gap-fitted to the adapter member positioning portion 34d in a state of being inserted into the joint accommodating portion 38. The adapter member 7 and the motor housing 21 are positioned with each other by being fitted in a gap between them. Therefore, if an assembly error occurs between the adapter member 7 and the motor housing 21, the alignment of the motor shaft 22 and the motor pulley shaft portion 20 may be affected. Therefore, by connecting the motor shaft 22 and the motor pulley shaft portion 20 with a universal joint, the influence of the shaft deviation between the motor shaft 22 and the motor pulley shaft portion 20 can be suppressed.

The tip bearing 37 of the motor pulley shaft support portion 8 supports the end portion 20b of the motor pulley shaft portion 20, and the tip bearing 37 is provided so as not to come into contact with the gear housing main body portion 6. Since the gear housing main body 6 and the adapter member 7 are positioned on the adapter member main body 7a side, the tip bearing 37 side has a structure that does not come into contact with the gear housing main body 6, so that the gear housing in the tip bearing 37 It is not affected by the shape error and assembly error of the main body 6 and adapter member 7.
A main bearing 36 that supports the end portion 22a of the motor shaft 22 is provided, and the main bearing 36 has a sealing function that prevents moisture from entering the motor housing 21 via the main bearing 36. As a result, it is possible to prevent water from entering the electric motor 9 when the electric motor 9 is removed from the gear housing 5 when the electric motor 9 is replaced or maintained.

[Embodiment 2]
Since the basic configuration of the second embodiment is the same as that of the first embodiment, only the parts different from the first embodiment will be described. FIG. 8 is a cross-sectional view of a main part of the steering device 100 of the second embodiment.
The steering device 100 of the second embodiment is different from the first embodiment in that the arm portion 35 is provided so as to pass through the outside of the endless belt 13. The arm portion 35 is arranged at a position opposite to the rotation axis O2 of the nut pulley 14 with the rotation axis O1 of the motor pulley 12 interposed therebetween.

In the second embodiment, the arm portion 35 is arranged outside the endless belt 13, so that when the motor pulley shaft support portion 8 is rotated to adjust the tension of the endless belt 13, the arm portion 35 is placed inside the endless belt 13. Compared with the arranged structure, the risk of interference between the motor pulley shaft support portion 8 and the endless belt 13 can be reduced, and the tension adjustment range of the endless belt 13 can be expanded.

[Embodiment 3]
Since the basic configuration of the third embodiment is the same as that of the first embodiment, only the parts different from the first embodiment will be described. FIG. 9 is a cross-sectional view of a main part of the steering device 101 of the third embodiment.
The steering device 101 of the third embodiment is different from the first embodiment in that the end portion of the motor pulley shaft support portion 8 on the positive direction side of the X axis is supported by the gear housing main body portion 6.
The bearing accommodating portion 35a of the motor pulley shaft support portion 8 has a tip fixing portion 35b. The tip fixing portion 35b has a cylindrical shape protruding from the bearing accommodating portion 35a in the positive direction of the X-axis. The tip fixing portion 35b is inserted into a recess 6c provided in the gear housing main body portion 6.

One of both ends in the axial direction of the motor pulley shaft support portion 8 is connected to the adapter member main body 7a, and the adapter member main body 7a is connected to the gear housing main body 6. On the other hand, by fixing the other of both ends of the motor pulley shaft support portion 8 in the axial direction to the gear housing main body portion 6 using the tip fixing portion 35b, the motor pulley shaft support portion 8 has a double-sided structure. , The bending of the motor pulley shaft portion 20 due to the tension of the endless belt 13 can be suppressed.

[Embodiment 4]
Since the basic configuration of the fourth embodiment is the same as that of the first embodiment, only the parts different from the first embodiment will be described. FIG. 10 is a cross-sectional view of a main part of the steering device 102 of the fourth embodiment.
The steering device of the fourth embodiment is different from the first embodiment in the shapes of the in-row portion (adapter member tubular portion) 33 and the flange portion 34 of the adapter member main body portion 7a. The in-row portion 33 of the fourth embodiment has a larger outer diameter and a thicker wall thickness (thickness in the radial direction with respect to the rotation axis O1) than that of the first embodiment. Along with this, the adapter member insertion hole 5a of the gear housing 5 is also formed to have a larger inner diameter than that of the first embodiment. The in-row portion 33 is provided with three screw holes (female screw portions of the adapter member) 33d that open in the negative direction of the X-axis. Bolts 40 for fixing the motor housing main body 25 to the adapter member main body 7a are tightened in the three screw holes 33d. The three screw holes 33d are arranged at unequal intervals (90 °, 120 °, 150 °) in the circumferential direction with respect to the central axis of the in-row portion 33. The three bolt bosses 21b of the motor housing main body 25 are provided with bolt insertion holes 21c through which the bolts 40 pass.

In the fourth embodiment, a screw hole 33d into which a bolt 40 for fastening the adapter member main body 7a and the motor housing 21 is tightened is provided in the in-row portion 33 of the adapter member main body 7a. Since the inro portion 33 is inserted into the adapter member insertion hole 5a, a part of the screw hole 33d can be arranged inside the adapter member mounting surface of the gear housing main body 6 by providing the screw hole 33d in the inro portion 33. .. As a result, it is possible to suppress the dimension of the adapter member main body 7a in the X-axis direction from becoming longer as compared with the case where the screw hole is provided in the flange portion 34, and the device can be miniaturized.

[Embodiment 5]
Since the basic configuration of the fifth embodiment is the same as that of the first embodiment, only the parts different from the first embodiment will be described. FIG. 11 is a cross-sectional view of a main part of the steering device 103 of the fifth embodiment.
In the steering device 103 of the fifth embodiment, the gear housing 5 has a shaft support member 42 formed of a member different from the gear housing main body 6. The shaft support member 42 is arranged on the side opposite to the electric motor 9 with the motor pulley 12 interposed therebetween in the X-axis direction. The shaft support member 42 has a motor pulley shaft support portion 8 that rotatably supports the motor pulley 12 in the direction around the rotation axis O1 inside the speed reducer accommodating space 6b. The shaft support member 42 has an in-row portion 43 and a flange portion 44.

The inro portion 43 is formed in a cylindrical shape that can be inserted into the shaft support portion insertion hole 5b of the gear housing 5. The shaft support member 42 can rotate in the shaft support portion insertion hole 5b when the shaft support member 42 (inlay portion 43) is inserted (gap fitted) and the shaft support member 42 is not fixed to the gear housing 5. Has a unique shape. The central axis of the inro portion 43 is eccentric with respect to the rotation axis O1. The flange portion 44 is formed in an annular shape that protrudes outward in the radial direction with respect to the central axis of the inlay portion 43 from the end portion of the inrow portion 43 on the positive direction side of the X axis. The flange portion 44 is provided with two elongated holes 45 penetrating in the X-axis direction. The two elongated holes 45 extend in the circumferential direction with respect to the central axis of the in-row portion 43. Bolts 41 for fixing the shaft support member 42 to the gear housing 5 are inserted into the two elongated holes 45.

The motor pulley shaft support portion 8 has a bearing accommodating portion 46, an arm portion 47, and a bearing accommodating portion 48. The bearing accommodating portion 46 is provided in the center of the in-row portion 43 and supports the main bearing 49. At the X-axis negative end of the bearing accommodating portion 46, an annular positioning portion 46a projecting inward in the radial direction with respect to the rotation axis O1 is provided. The positioning portion 46a abuts on the end face of the main bearing 49 on the negative direction side of the X axis in the X axis direction. The main bearing 49 rotatably supports the end portion 20a of the motor pulley shaft portion 20 on the positive direction side of the X axis. Since the bearing accommodating portion 46 opens in the negative direction of the X-axis, the main bearing 49 can be inserted into the bearing accommodating portion 46 from the positive direction side of the X-axis.

The arm portion 47 protrudes from the in-row portion 43 in the negative direction of the X-axis and is cantilevered by the shaft support member 42. The arm portion 47 is arranged at a position closer to the rotation axis O2 of the nut pulley 14 than the rotation axis O1 of the motor pulley 12. The arm portion 47 is formed in a substantially L shape whose tip bends inward in the radial direction with respect to the rotation axis O1. The arm portion 47 is provided so as to pass through the inside of the endless belt 13. The arm portion 47 is formed so as not to come into contact with the endless belt 13 in a range in which the tension of the endless belt 13 can be adjusted, that is, in a rotatable range of the shaft support member 42 with respect to the gear housing 5.

The bearing accommodating portion 48 is provided at the tip (bent portion) of the arm portion 47. The bearing accommodating portion 48 supports the tip bearing 50. The tip bearing 50 rotatably supports the end 20b on the negative side of the X-axis of the motor pulley shaft portion 20. The outer diameter of the tip bearing 50 is set smaller than the outer diameter of the motor pulley belt winding portion 12a.
The motor housing main body 25 is fastened and fixed to the gear housing main body 6 with three bolts 40.
In the fifth embodiment, since the shaft support member 42 and the electric motor 9 are arranged so as to sandwich the gear housing main body 6, it is possible to suppress the increase in size of only the electric motor 9 side and improve the vehicle mountability. it can.

[Other Embodiments]
Although the embodiments for carrying out the present invention have been described above, the specific configuration of the present invention is not limited to the configurations of the embodiments, and there are design changes and the like within a range that does not deviate from the gist of the invention. Is also included in the present invention.
The steering shaft may be a steering shaft on which rack teeth are not formed.
The motor pulley may have a motor pulley belt winding portion and a motor pulley shaft having an integral structure or a separate structure.
A protrusion is provided on the gear housing or the motor housing, and when the motor housing cannot be assembled within a predetermined angle range with respect to the gear housing, the protrusion interferes with the mating member to the gear housing. The position of the motor housing in the rotational direction may be restricted.

The technical ideas that can be grasped from the embodiments described above are described below.
In one aspect thereof, the steering device is a gear housing, comprising a gear housing main body portion and a motor pulley shaft support portion, and the gear housing main body portion is a steering shaft inside the gear housing main body portion. The gear housing, the steering shaft, the steering shaft main body, and the steering shaft ball screw groove, which include the accommodation space and the speed reducer accommodation space, are provided in the steering shaft accommodation space of the steering shaft. The steering wheels can be steered by moving in the longitudinal direction, the steering shaft main body has a rod shape, and the steering shaft ball thread groove is provided on the outer peripheral side of the steering shaft main body. The steering shaft and the nut, which have a spiral groove shape, have a nut main body and a nut ball screw groove, and are rotatably provided inside the speed reducer accommodating space. The portion has a tubular shape, the steering shaft is inserted, and the nut ball screw groove has a spiral groove shape formed on the inner peripheral side of the nut main body portion, and the nut ball screw groove and the portion. The nut that forms a spiral ball moving passage between the steering shaft ball screw grooves, and the nut that is provided in the ball moving passage and moves in the ball moving passage as the nut rotates. A plurality of balls for moving the steering shaft with respect to the nut in the direction of the rotation axis of the nut, and a nut pulley belt winding portion provided in the speed reducer accommodating space and rotatable integrally with the nut. The endless belt and the motor pulley, which are provided in the speed reducer accommodating space and are wound around the nut pulley belt winding portion and the motor pulley belt winding portion, are provided in the speed reducer accommodating space. The motor pulley belt has a winding portion and a motor pulley shaft portion, and the motor pulley shaft portion can be supported by the motor pulley shaft support portion in a state where the tension of the endless belt is applied. The motor pulley, the electric motor, the motor housing, the motor shaft, the motor rotor, and the motor stator, and the motor housing includes a motor housing main body portion that can be connected to the gear housing and the motor housing body. It is provided with a motor element accommodating space provided inside the motor housing main body portion, and the motor shaft is formed separately from the motor pulley shaft portion, and can be connected to and separated from the motor pulley shaft portion. It is possible and the motor is required The motor rotor is rotatably provided in the element accommodation space, the motor rotor can be rotated integrally with the motor shaft, and the motor stator is provided in the motor element accommodation space and is provided on the outer peripheral side of the motor rotor. It has the electric motor.

In a more preferred embodiment, in the above aspect, the gear housing further includes an adapter member formed of a member separate from the gear housing main body portion, and the motor pulley shaft support portion is provided on the adapter member. There is.
In another preferred embodiment, in any of the above embodiments, the adapter member comprises a centering mechanism, which adjusts the relative position of the motor pulley rotation axis with respect to the nut rotation axis. The tension of the endless belt can be adjusted.
In yet another preferred embodiment, in any of the above embodiments, in a state where the motor housing body is not connected to the gear housing, the adapter member is subjected to the tension of the endless belt adjusted by the centering mechanism. Can be fixed to the gear housing main body while maintaining the above.
In yet another preferred embodiment, in any of the above embodiments, the gear housing body is provided with an adapter member insertion hole, and the adapter member insertion hole is such that the adapter member is inserted into the adapter member insertion hole and the adapter member is inserted into the adapter member insertion hole. The adapter member is rotatable in a state where the adapter member is not fixed to the gear housing main body portion, and the adapter member includes an adapter member main body portion and the motor pulley shaft support portion, and the motor pulley shaft support portion. The portion is connected to the adapter member main body portion, is provided so as to pass through the inside of the endless belt, is a pair of end portions of the motor pulley shaft portion, and is a pulley shaft first portion farther from the electric motor. Each of the end portion and the second end portion of the pulley shaft closer to the electric motor can be supported, and the motor pulley shaft portion is on the rotation axis when the adapter member rotates in the adapter member insertion hole. On the other hand, the rotation axis of the motor pulley shaft portion is offset, and the rotation of the adapter member in the adapter member insertion hole changes the distance between the rotation axis of the motor pulley and the rotation axis of the nut pulley. The motor pulley shaft portion is formed so as not to come into contact with the endless belt within a range in which the tension of the endless belt can be adjusted.

In yet another preferred embodiment, in any of the above embodiments, the adapter member comprises an adapter member body portion and the motor pulley shaft support portion, and the motor pulley shaft support portion is connected to the adapter member body portion. It is a pair of ends of the motor pulley shaft portion, and can support each of the first end portion of the pulley shaft farther from the electric motor and the second end portion of the pulley shaft closer to the electric motor. ..
In yet another preferred embodiment, in any of the above embodiments, the motor pulley shaft support is provided so as to pass through the inside of the endless belt.
In yet another preferred embodiment, in any of the above embodiments, a first pulley shaft bearing and a second pulley shaft bearing are further provided, wherein the first pulley shaft bearing supports the first end of the pulley shaft. The second pulley shaft bearing supports the second end portion of the pulley shaft, and the first pulley shaft bearing is the motor in a state where the first pulley shaft bearing is mounted on the first end portion of the pulley shaft. The size of the first pulley shaft bearing does not come into contact with the endless belt when the pulley shaft portion passes through the inside of the endless belt.
In yet another preferred embodiment, in any of the above embodiments, the outer diameter of the first pulley shaft bearing is smaller than the outer diameter of the motor pulley belt winding portion.

In yet another preferred embodiment, in any of the above embodiments, the motor pulley shaft support is provided so as to pass outside the endless belt.
In yet another preferred embodiment, in any of the above embodiments, a first pulley shaft bearing and a second pulley shaft bearing are further provided, and the adapter member main body portion has a second pulley shaft bearing accommodating portion. The second pulley shaft bearing accommodating portion has a concave shape that opens toward the electric motor in the direction of the rotation axis of the motor pulley shaft portion, and the second pulley shaft bearing accommodating portion is the motor. The second pulley shaft bearing has a positioning portion that abuts the second pulley shaft bearing in the direction of the rotation axis of the pulley shaft portion, and the second pulley shaft bearing is provided in the second pulley shaft bearing accommodating portion and the pulley shaft second. It supports the end portion and can be inserted into the second pulley shaft bearing accommodating portion in the direction of the rotation axis of the motor pulley shaft portion from the motor shaft toward the motor pulley shaft portion.
In yet another preferred embodiment, in any of the above embodiments, the motor pulley shaft support portion has a first end support portion and a tip fixing portion, and the first end support portion is the pulley shaft first. One end portion is supported, and the tip fixing portion is provided on the first end portion support portion and can be fixed to the gear housing main body portion.

In yet another preferred embodiment, in any of the above embodiments, the adapter member further comprises a joint, the adapter member comprises an adapter member body and the motor shaft support, and the adapter member body comprises a joint accommodating portion. The joint accommodating portion has a concave shape that opens toward the electric motor in the direction of the rotation axis of the motor pulley shaft portion, and the joint is accommodated in the joint accommodating portion. The motor shaft and the motor pulley shaft portion can be connected.
In yet another preferred embodiment, in any of the above embodiments, the adapter member has an adapter member positioning portion for positioning with the motor housing in a cross section orthogonal to the rotation axis of the motor pulley shaft portion.
In yet another preferred embodiment, in any of the above embodiments, the motor housing further comprises a joint, the joint being a universal joint, the motor shaft and the motor pulley shaft portion being connectable, the motor housing. The motor housing positioning insertion portion that projects toward the motor pulley shaft portion in the direction of the rotation axis of the motor pulley shaft portion is provided, the adapter member main body portion has a joint accommodating portion, and the joint accommodating portion includes a joint accommodating portion. In the direction of the rotation axis of the motor pulley shaft portion, it has a concave shape that opens toward the direction of the electric motor, and the adapter member positioning portion is formed on the inner peripheral surface of the joint accommodating portion. The motor housing positioning insertion portion is gap-fitted to the adapter member positioning portion in a state of being inserted into the joint accommodating portion.

In yet another preferred embodiment, in any of the above embodiments, the motor housing further comprises a joint, and the motor housing is positioned and inserted so as to project toward the motor pulley shaft portion in the direction of the rotation axis of the motor pulley shaft portion. The adapter member main body has a joint accommodating portion, and the joint accommodating portion has a concave shape that opens toward the electric motor in the direction of the rotation axis of the motor pulley shaft portion. The adapter member positioning portion is formed on the inner peripheral surface of the joint accommodating portion, and the motor housing positioning insertion portion is inserted into the joint accommodating portion with respect to the adapter member positioning portion. Fitted in a gap, the joint can connect the motor shaft and the motor pulley shaft portion, and the joint is the motor shaft before the insertion of the motor housing positioning insertion portion into the joint accommodating portion is started. Is provided so as to start the connection between the motor pulley shaft portion and the motor pulley shaft portion.

In yet another preferred embodiment, in any of the above embodiments, the adapter member comprises an adapter member body portion and the motor pulley shaft support portion, and the motor pulley shaft support portion is connected to the adapter member body portion. A pair of ends of the motor pulley shaft portion, which can support each of the first end portion of the motor pulley shaft farther from the electric motor and the second end portion of the motor pulley shaft closer to the electric motor. The motor pulley shaft support portion has a first end support portion, the first end support portion supports the first end portion of the pulley shaft, and the first end portion is supported. The support portion is provided so as not to come into contact with the gear housing main body portion.
In yet another preferred embodiment, in any of the above embodiments, the adapter member comprises an adapter member body portion and the motor pulley shaft support portion, and the adapter member body portion includes an adapter member tubular portion. The motor shaft or the motor pulley shaft portion can be inserted into the adapter member tubular portion, the adapter member tubular portion includes an adapter member female thread portion, and the adapter member female thread portion is the motor pulley shaft. A female screw portion that opens in the direction of the rotation axis of the portion in the direction of the electric motor.
The motor housing has a bolt insertion hole, and the adapter member and the motor housing are connected by a bolt that is inserted into the bolt insertion hole and tightened into the female thread portion of the adapter member.

In yet another preferred embodiment, in any of the above embodiments, a motor shaft bearing is further provided, wherein the motor shaft bearing is a pair of ends of the motor shaft, the motor shaft first closer to the motor pulley. Of the end portion and the second end portion of the motor shaft farther from the motor pulley, the first end portion of the motor shaft is supported, and the motor shaft bearing has moisture in the motor housing via the motor shaft bearing. Has a sealing function to prevent intrusion.
In yet another preferred embodiment, in any of the above embodiments, the motor housing can be connected to the gear housing only within a predetermined angular range in the direction of rotation with respect to the rotation axis of the motor shaft.
In yet another preferred embodiment, in any of the above embodiments, the gear housing further comprises a shaft support member configured from a member separate from the gear housing body, wherein the shaft support member is the motor pulley shaft. In the direction of the rotation axis of the portion, the motor pulley is provided on the side opposite to the electric motor with the motor pulley interposed therebetween, and the motor pulley shaft support portion is provided on the shaft support member.

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

The present application claims priority based on Japanese Patent Application No. 2019-134275 filed on July 22, 2019. The entire disclosure, including the specification, claims, drawings, and abstract of Japanese Patent Application No. 2019-134275 filed on July 22, 2019, is incorporated herein by reference in its entirety.

1 Steering device 4 Rack bar (steering shaft) 4a Rack bar body (steering shaft body) 4b Rack bar ball thread groove (steering shaft ball thread groove) 5 Gear housing 5a Adapter member insertion hole 6 Gear housing body 6a Rack bar Accommodation space (steering shaft accommodation space) 6b Reducer accommodation space 7 Adapter member 7a Adapter member body 8 Motor pulley shaft support 9 Electric motor 12 Motor pulley 12a Motor pulley belt winding 13 Endless belt 14 Nut pulley 14a Nut pulley belt winding Part 15 Nut 15a Nut body part 15b Nut Ball screw groove 18 Ball movement passage 19 Ball 20 Motor pulley shaft part 20a End (pulley shaft second end) 20b End (pulley shaft first end) 21 Motor housing 21a Motor Housing positioning insertion part 21c Bolt insertion hole 22 Motor shaft 23 Motor rotor 24 Motor stator 25 Motor housing body part 26 Motor element accommodation space 33 Inlay part (adapter member tubular part) 33b Bearing accommodation part (second pulley shaft bearing accommodation part) 33c Positioning part 33d Screw hole (adapter member female thread part) 34d Adapter member positioning part 35a Bearing accommodating part (first end support part) 35b Tip fixing part 36 Main bearing (motor shaft bearing, second pulley shaft bearing) 37 Tip bearing ( 1st pulley shaft bearing) 38 Joint housing 39 Joint 42 Shaft support member

Claims

It ’s a steering device,
A gear housing including a gear housing body and a motor pulley shaft support.
The gear housing main body includes a steering shaft accommodating space and a speed reducer accommodating space inside the gear housing main body.
With the gear housing
The steering shaft is provided with a steering shaft main body and a steering shaft ball screw groove, and the steering wheel can be steered by moving in the longitudinal direction of the steering shaft in the steering shaft accommodation space.
The steering shaft main body has a rod shape and has a rod shape.
The steering shaft ball screw groove is provided on the outer peripheral side of the steering shaft main body portion and has a spiral groove shape.
With the steering shaft
It is a nut, has a nut main body and a nut ball screw groove, and is rotatably provided inside the speed reducer accommodating space.
The nut body has a tubular shape, and the steering shaft is inserted into the nut body.
The nut ball screw groove has a spiral groove shape formed on the inner peripheral side of the nut main body portion, and a spiral ball moving passage is formed between the nut ball screw groove and the steering shaft ball screw groove. To do,
With the nut
A plurality of balls provided in the ball moving passage and moving in the ball moving passage with the rotation of the nut to move the steering axis with respect to the nut in the direction of the rotation axis of the nut. When,
A nut pulley provided in the speed reducer accommodating space, capable of rotating integrally with the nut, and having a nut pulley belt winding portion.
An endless belt provided in the speed reducer accommodating space and wound around the nut pulley belt winding portion and the motor pulley belt winding portion.
A motor pulley, which is provided in the speed reducer accommodating space and has the motor pulley belt winding portion and the motor pulley shaft portion.
The motor pulley shaft portion can be supported by the motor pulley shaft support portion in a state where the tension of the endless belt is applied.
With the motor pulley
It is an electric motor and has a motor housing, a motor shaft, a motor rotor, and a motor stator.
The motor housing includes a motor housing main body that can be connected to the gear housing, and a motor element accommodating space provided inside the motor housing main body.
The motor shaft is formed separately from the motor pulley shaft portion, can be connected to and separated from the motor pulley shaft portion, and is rotatably provided in the motor element accommodating space.
The motor rotor can rotate integrally with the motor shaft, and the motor rotor can rotate integrally with the motor shaft.
The motor stator is provided in the motor element accommodating space and is provided on the outer peripheral side of the motor rotor.
With the electric motor
Steering device with.
The steering device according to claim 1.
The gear housing further includes an adapter member that is made of a member separate from the gear housing main body.
The motor pulley shaft support portion is a steering device provided on the adapter member.
The steering device according to claim 2.
The adapter member includes a centering mechanism and
The centering mechanism is a steering device capable of adjusting the tension of the endless belt by adjusting the relative position of the rotation axis of the motor pulley with respect to the rotation axis of the nut.
The steering device according to claim 3.
In a state where the motor housing main body is not connected to the gear housing
The adapter member is a steering device that can be fixed to the gear housing main body while maintaining the tension of the endless belt adjusted by the centering mechanism.
The steering device according to claim 3.
The gear housing main body is provided with an adapter member insertion hole.
In the adapter member insertion hole, the adapter member can rotate in a state where the adapter member is inserted into the adapter member insertion hole and the adapter member is not fixed to the gear housing main body.
The adapter member includes an adapter member main body portion and the motor pulley shaft support portion.
The motor pulley shaft support portion is connected to the adapter member main body portion, is provided so as to pass through the inside of the endless belt, is a pair of end portions of the motor pulley shaft portion, and is far from the electric motor. It is possible to support each of the first end of the pulley shaft and the second end of the pulley shaft closer to the electric motor.
In the motor pulley shaft portion, the rotation axis of the motor pulley shaft portion is offset from the rotation axis when the adapter member rotates in the adapter member insertion hole, and the motor pulley shaft portion is described in the adapter member insertion hole. It is provided so that the distance between the rotation axis of the motor pulley and the rotation axis of the nut pulley changes as the adapter member rotates.
Moreover, the motor pulley shaft portion is a steering device formed so as not to come into contact with the endless belt within a range in which the tension of the endless belt can be adjusted.
The steering device according to claim 2.
The adapter member includes an adapter member main body portion and the motor pulley shaft support portion.
The motor pulley shaft support portion is connected to the adapter member main body portion, is a pair of end portions of the motor pulley shaft portion, and is attached to the first end portion of the pulley shaft farther from the electric motor and the electric motor. A steering device capable of supporting each of the second ends of the closer pulley shafts.
The steering device according to claim 6.
The motor pulley shaft support portion is a steering device provided so as to pass through the inside of the endless belt.
The steering device according to claim 7.
The steering device further includes a first pulley shaft bearing and a second pulley shaft bearing.
The first pulley shaft bearing supports the first end of the pulley shaft and
The second pulley shaft bearing supports the second end of the pulley shaft and
The first pulley shaft bearing is the first pulley shaft when the motor pulley shaft portion passes inside the endless belt in a state where the first pulley shaft bearing is mounted on the first end portion of the pulley shaft. A steering device having a size such that the bearing does not come into contact with the endless belt.
The steering device according to claim 8.
A steering device in which the outer diameter of the first pulley shaft bearing is smaller than the outer diameter of the motor pulley belt winding portion.
The steering device according to claim 6.
The motor pulley shaft support portion is a steering device provided so as to pass through the outside of the endless belt.
The steering device according to claim 6.
The steering device further includes a first pulley shaft bearing and a second pulley shaft bearing.
The motor pulley shaft support portion has a second pulley shaft bearing accommodating portion.
The second pulley shaft bearing accommodating portion has a concave shape that opens in the direction of the rotation axis of the motor pulley shaft portion in the direction of the electric motor.
The second pulley shaft bearing accommodating portion has a positioning portion with which the second pulley shaft bearing abuts in the direction of the rotation axis of the motor pulley shaft portion.
The second pulley shaft bearing is provided in the second pulley shaft bearing accommodating portion, supports the second end portion of the pulley shaft, and has a rotation axis of the motor pulley shaft portion with respect to the second pulley shaft bearing accommodating portion. A steering device that can be inserted in the direction from the motor shaft toward the motor pulley shaft portion in the above direction.
The steering device according to claim 6.
The motor pulley shaft support portion has a first end support portion and a tip fixing portion.
The first end support portion supports the first end portion of the pulley shaft.
The tip fixing portion is a steering device provided on the first end support portion and can be fixed to the gear housing main body portion.
The steering device according to claim 2.
The steering device further comprises a joint.
The adapter member includes an adapter member main body portion and the motor shaft support portion.
The adapter member main body has a joint accommodating portion.
The joint accommodating portion has a concave shape that opens in the direction of the electric motor in the direction of the rotation axis of the motor pulley shaft portion.
A steering device in which the joint is housed in the joint accommodating portion and can connect the motor shaft and the motor pulley shaft portion.
The steering device according to claim 2.
The adapter member is a steering device having an adapter member positioning portion for positioning with the motor housing in a cross section orthogonal to the rotation axis of the motor pulley shaft portion.
The steering device according to claim 14.
The steering device further comprises a joint.
The joint is a universal joint, and can connect the motor shaft and the motor pulley shaft portion.
The motor housing includes a motor housing positioning insertion portion that projects toward the motor pulley shaft portion in the direction of the rotation axis of the motor pulley shaft portion.
The adapter member main body has a joint accommodating portion.
The joint accommodating portion has a concave shape that opens in the direction of the electric motor in the direction of the rotation axis of the motor pulley shaft portion.
The adapter member positioning portion is formed on the inner peripheral surface of the joint accommodating portion.
The motor housing positioning insertion portion is a steering device that is gap-fitted to the adapter member positioning portion in a state of being inserted into the joint accommodating portion.
The steering device according to claim 14.
The steering device further comprises a joint.
The motor housing includes a motor housing positioning insertion portion that projects toward the motor pulley shaft portion in the direction of the rotation axis of the motor pulley shaft portion.
The adapter member main body has a joint accommodating portion.
The joint accommodating portion has a concave shape that opens in the direction of the electric motor in the direction of the rotation axis of the motor pulley shaft portion.
The adapter member positioning portion is formed on the inner peripheral surface of the joint accommodating portion.
The motor housing positioning insertion portion is gap-fitted to the adapter member positioning portion in a state of being inserted into the joint accommodating portion.
The joint can connect the motor shaft and the motor pulley shaft portion.
The joint is a steering device provided so as to start a connection between the motor shaft and the motor pulley shaft portion before the insertion of the motor housing positioning insertion portion into the joint accommodating portion is started.
The steering device according to claim 2.
The adapter member includes an adapter member main body portion and the motor pulley shaft support portion.
The motor pulley shaft support portion is connected to the adapter member main body portion, is a pair of end portions of the motor pulley shaft portion, and is a motor pulley shaft first end portion farther from the electric motor and the electric motor. Can support each of the second ends of the motor pulley shaft closer to
The motor pulley shaft support portion has a first end support portion and has a first end support portion.
A steering device in which the first end support portion supports the first end portion of the pulley shaft, and the first end support portion is provided so as not to come into contact with the gear housing main body portion.
The steering device according to claim 2.
The adapter member includes an adapter member main body portion and the motor pulley shaft support portion.
The adapter member main body portion includes an adapter member tubular portion.
The motor shaft or the motor pulley shaft portion can be inserted into the adapter member tubular portion.
The adapter member tubular portion includes an adapter member female thread portion.
The female screw portion of the adapter member is a female screw portion that opens in the direction of the rotation axis of the motor pulley shaft portion in the direction of the electric motor.
The motor housing has a bolt insertion hole
A steering device in which the adapter member and the motor housing are inserted into the bolt insertion holes and connected by bolts tightened into the female threaded portion of the adapter member.
The steering device according to claim 1.
The steering device further comprises a motor shaft bearing.
The motor shaft bearing is a pair of ends of the motor shaft, and is the motor shaft first portion of a motor shaft first end portion closer to the motor pulley and a motor shaft second end portion farther from the motor pulley. Supports one end,
The motor shaft bearing is a steering device having a sealing function for preventing moisture from entering the motor housing through the motor shaft bearing.
The steering device according to claim 1.
A steering device in which the motor housing can be connected to the gear housing only within a predetermined angle range in the rotation direction with respect to the rotation axis of the motor shaft.
The steering device according to claim 1.
The gear housing further includes a shaft support member formed of a member separate from the gear housing main body.
The shaft support member is provided on the side opposite to the electric motor with the motor pulley in the direction of the rotation axis of the motor pulley shaft portion.
The motor pulley shaft support portion is a steering device provided on the shaft support member.