Steering system

Abstract

To improve rigidity and strength of a support for supporting a body part with respect to a shaft member, in a steering device.SOLUTION: A steering device 1 includes a body part, and a support 60 for supporting the body part with respect to a shaft member 8, wherein the support 60 includes a pair of support walls 61 having through holes 61a for penetrating the shaft member 8, and a connection wall 62 which is integral with the pair of support walls 61 and connects the pair of support walls 61, the connection wall 62 is arranged on both sides so as to sandwich the through holes 61a in a first direction perpendicular to an axis line 61a1 of the through holes 61a, and the thickness of the connection wall 62 is smaller than the diameter of the through hole 61a.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a steering device.

Background Art

[0002] Patent Document 1 discloses an electric power steering device as an example of a steering device, which has a tilt hinge portion through which a tilt hinge shaft penetrates and tilts and swings around the tilt hinge shaft.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a steering device, there is a desire to further improve the rigidity and strength of a tilt hinge portion (support body) that supports a main body portion with respect to a tilt hinge shaft (shaft member).

[0005] An aspect of the present disclosure aims to improve the rigidity and strength of a support body that supports a main body portion with respect to a shaft member in a steering device.

Means for Solving the Problems

[0006] An aspect of the present disclosure includes a main body portion and a support body that supports the main body portion with respect to a shaft member. The support body includes a pair of support walls having through holes through which the shaft member penetrates, and a connection wall that is integral with the pair of support walls and connects the pair of support walls. The connection wall is disposed on both sides of the through hole in a first direction orthogonal to the axis of the through hole, and the thickness of the connection wall is smaller than the diameter of the through hole, and provides a steering device.

[0007] According to embodiments of this disclosure, the rigidity and strength of the support against forces acting from the axial member can be improved compared to cases where the support does not have a connecting wall. Furthermore, when the thickness of the connecting wall is smaller than the diameter of the through hole and the support is formed by casting, the occurrence of casting defects in the connecting wall can be suppressed, thereby improving the strength of the connecting wall.

[0008] In an embodiment of this disclosure, the connecting wall has a curved surface that is continuous with the inner circumferential surface of the through hole.

[0009] This allows the force acting from the shaft member to the support to be directly received by both the pair of support walls and connecting walls. Therefore, the concentration of force acting from the shaft member on the support can be suppressed, and the strength of the support can be improved.

[0010] In an embodiment of the present disclosure, the main body comprises a steering shaft, the axis of the steering shaft is parallel to the first direction, and the thickness of the connecting wall decreases along the first direction from the first side in the first direction to the second side in the first direction.

[0011] This allows the direction of movement of the mold that forms the connecting wall to be parallel to the axis of the steering shaft. Therefore, connecting walls can be easily provided on the components of the steering device that are formed by a mold that moves parallel to the axis of the steering shaft.

[0012] In an embodiment of this disclosure, the connecting wall coincides with the axis of the through hole when viewed along the first direction.

[0013] As a result, the connecting wall coincides with the line of action of the force acting from the axial member when viewed along the first direction. Therefore, the strength of the support against the force acting from the axial member can be further improved.

[0014] In an aspect of the present disclosure, the main body portion includes a reduction gear connected to an output shaft of a motor and a housing that houses the reduction gear, and the support is integral with the housing.

[0015] When the steering device is an electric power steering device, the support is provided integrally with a housing that houses a reduction gear of the motor. Thereby, compared with the case where the support does not include a connection wall, the rigidity and strength of the support against the reaction force generated by the output of the motor can be improved.

Advantages of the Invention

[0016] According to an aspect of the present disclosure, in a steering device, the rigidity and strength of a support that supports a main body portion with respect to a shaft member can be improved. s

Brief Description of the Drawings

[0017] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a steering device. s [Figure 2] FIG. 2 is a perspective view of an assist device. [Figure 3] ]>FIG. 3 is a plan view of the assist device viewed from the -X side. [Figure 4] FIG. 4 is a cross-sectional view of the assist device taken along line A-A shown in FIG. 3. [Figure 5] FIG. 5 is a cross-sectional view of the support taken along line B-B shown in FIG. 3. [Figure 6] FIG. 6 is a perspective view of a cover portion of a housing in a steering device according to a first modification of the embodiment, viewed from the -X side. [Figure 7] FIG. 7 is a perspective view of the cover portion of the housing shown in FIG. 6, viewed from the +X side. [Figure 8] FIG. 8 is a cross-sectional view of a support in a steering device according to another modification of the embodiment.

Modes for Carrying Out the Invention

[0018] Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited thereto. The components of each embodiment described below can be combined as appropriate. Also, some components may not be used.

[0019] In the following description, the direction parallel to the axis 10a of the steering shaft 10 to be described later is defined as the X direction, the direction orthogonal to the X direction and parallel to the axis 8a of the shaft member 8 to be described later is defined as the Y direction. The direction orthogonal to each of the X direction and the Y direction is defined as the Z direction. The X direction corresponds to the "first direction". Also, the +X side in the X direction corresponds to the "first side of the first direction", and the -X side in the X direction corresponds to the "second side of the first direction". Note that the directions of X, Y, and Z are merely examples, and the present disclosure is not limited to these directions.

[0020] FIG. 1 is a schematic diagram showing the configuration of the steering device 1. The steering device 1 is attached to the vehicle body and is an electric power steering device that assists the operation of the steering wheel 2 by the output of a motor 33 to be described later. [[ID=​​​​​​​​​​​

[0024] When the driver operates the steering wheel 2, the steering shaft 10, the intermediate shaft 4, and the pinion shaft 5 rotate, causing the driving wheels (not shown) to steer.

[0025] The steering shaft 10 comprises a first shaft 11 and a second shaft 12. The first shaft 11 is positioned on the +X side of the second shaft 12 and is fitted to the second shaft 12 so as to be movable along the X direction relative to the second shaft 12.

[0026] The steering column 20 is a hollow column extending along the X direction. The steering shaft 10 passes through the steering column 20. The steering column 20 supports the steering shaft 10 so that it can rotate around its axis 10a via bearings (not shown).

[0027] The steering column 20 comprises a first column 21 and a second column 22. The first column 21 is positioned on the +X side of the second column 22 and is fitted to the second column 22 so as to be movable along the X direction relative to the second column 22. The first column 21 is movable along the X direction integrally with the first shaft 11.

[0028] The first column 21 and the second column 22 are each formed, for example, by casting, using a mold that moves in the X direction (i.e., in a direction parallel to the axis 10a of the steering shaft 10). The material of the first column 21 and the second column 22 is, for example, an aluminum alloy.

[0029] Furthermore, a first bracket 7a, which is fixed to a body member 6 included in the vehicle body, is attached to the first column 21. A mechanism (not shown) is attached to the first bracket 7a that allows the first column 21 and the first shaft 11 to move along the X direction relative to the body member 6, and allows the steering column 20 and the steering shaft 10 to swing around the axis 8a of the shaft member 8, which will be described later, relative to the body member 6. In other words, the mechanism functions as a so-called telescopic mechanism and tilt mechanism. The mechanism is also equipped with a lever member (not shown) that allows and limits the movement of the first column 21 and the swinging of the steering column 20 relative to the body member 6.

[0030] The assist device 30 assists in the operation of the steering wheel 2. The assist device 30 is fixed to the second column 22. The second shaft 12 passes through the assist device 30. The assist device 30 supports the second shaft 12 so that it can rotate around the axis 10a via a bearing (not shown).

[0031] The assist device 30 is attached to the shaft member 8 so that the assist device 30 can swing around the axis 8a of the shaft member 8 relative to the vehicle body member 6. As a result, when the mechanism allows the steering column 20 to swing, the assist device 30, the steering column 20, and the steering shaft 10 can swing around the axis 8a of the shaft member 8 relative to the vehicle body member 6.

[0032] The axle member 8 is attached to the second bracket 7b, which is fixed to the vehicle body member 6, along the vehicle width direction. In other words, the axis 8a of the axle member 8 is parallel to the vehicle width direction, extends along the Y direction, and is perpendicular to the axis 10a of the steering shaft 10.

[0033] Figure 2 is a perspective view of the assist device 30. The assist device 30 comprises a housing 31, a torque sensor 32, a motor 33, and a reduction gear 34. The housing 31 houses the reduction gear 34. The housing 31 comprises a base portion 40 and a cover portion 50.

[0034] The base portion 40 and the cover portion 50 are fastened together using bolts and nuts. The base portion 40 and the cover portion 50 are each formed by casting using a mold that moves in the X direction (i.e., in a direction parallel to the axis 10a of the steering shaft 10). The material of the base portion 40 and the cover portion 50 is, for example, an aluminum alloy.

[0035] Figure 3 is a plan view of the assist device 30 as seen from the -X side. Figure 4 is a cross-sectional view of the assist device 30 along line AA shown in Figure 3.

[0036] As shown in Figure 4, the base portion 40 has a cylindrical portion 41, a first storage portion 42, and a second storage portion 43. The cylindrical portion 41, the first storage portion 42, and the second storage portion 43 are integrally formed.

[0037] The second column 22 is fixed to the cylindrical portion 41. The cylindrical portion 41 supports the second shaft 12 from the inside via a bearing (not shown).

[0038] The first storage section 42 has a shape that opens to the -X side and has an annular bottom wall 42a in plan view that is continuous with the -X end of the cylindrical section 41, and a circumferential side wall 42b that is arranged around the entire circumference of the periphery of the bottom wall 42a.

[0039] The second storage section 43, shown in Figures 3 and 4, is cylindrical with the +Z side open and the -Z side closed, and the motor 33 is attached to the +Z side. The second storage section 43 is continuous with the circumferential side wall 42b, and the inside of the second storage section 43 and the inside of the first storage section 42 are in communication through a communication opening 42b1 (Figure 4).

[0040] The cover portion 50 is disc-shaped and covers the -X side of the first storage portion 42. As shown in Figure 4, the cover portion 50 has a hole 51 through which the second shaft 12 passes, and supports the second shaft 12 via a bearing (not shown).

[0041] The torque sensor 32 shown in Figure 2 is located in the housing 31 and detects the rotational torque of the steering shaft 10.

[0042] Motor 33 is an ECU (Electronic Control Unit) integrated motor. The ECU controls the output of motor 33 based on the detection result of torque sensor 32. The ECU controls the output of motor 33, for example, by adjusting the amount of rotation per unit time of motor 33.

[0043] As shown in Figure 3, the reduction gear 34 includes a worm gear 34a and a worm wheel 34b. The worm gear 34a is mounted on the output shaft 33a of the motor 33 and housed in the second housing 43. As shown in Figure 4, the worm wheel 34b is mounted on the second shaft 12 so as to be rotatable integrally with the second shaft 12 and housed in the first housing 42 in a state where it meshes with the worm gear 34a via a communication opening 42b1.

[0044] As the output shaft 33a of the motor 33 rotates, the output of the motor 33 is transmitted to the steering shaft 10 via the reduction gear 34. This assists the driver in operating the steering wheel 2.

[0045] Furthermore, as shown in Figures 2, 3, and 4, the assist device 30 includes a support 60 through which the shaft member 8 passes, and which supports the assist device 30 and the steering column 20 and steering shaft 10 via the assist device 30. The steering shaft 10, steering column 20, and assist device 30 constitute the "main body".

[0046] The support 60 supports the main body (steering shaft 10, steering column 20, and assist device 30). The shaft member 8 is attached to the support 60 so as to be able to swing around the axis 8a of the shaft member 8 relative to the vehicle body member 6. In other words, the support 60 supports the main body so that the main body can swing around the axis 8a of the shaft member 8.

[0047] The support 60 is integrated with the housing 31. Specifically, the support 60 is integrated with the cover portion 50 and is positioned on the -X side surface of the cover portion 50 shown in Figure 4 (hereinafter referred to as the main surface 50a). The support 60 is formed when the cover portion 50 is formed. In other words, the support 60 is formed by casting.

[0048] As shown in Figures 3 and 4, the support 60 has a pair of support walls 61 and a connecting wall 62. The pair of support walls 61 and the connecting wall 62 are integral.

[0049] The pair of support walls 61 are plate-shaped, extending from the main surface 50a of the cover portion 50 toward the -X side along the X direction, and having a plate surface that intersects with the Y direction. The thickness of the pair of support walls 61 decreases as you move from the +X side toward the -X side along the X direction. Specifically, the plate surface on the +Y side of the pair of support walls 61 is a tapered surface that slopes from the +Y side toward the -Y side along the Y direction as you move from the +X side toward the -X side along the X direction. On the other hand, the plate surface on the -Y side of the pair of support walls 61 is a tapered surface that slopes from the -Y side toward the +Y side along the Y direction as you move from the +X side toward the -X side along the X direction.

[0050] Figure 5 is a cross-sectional view of the support 60 along the line BB shown in Figure 3. As shown in Figures 4 and 5, the pair of support walls 61 have through holes 61a through which the shaft member 8 passes. The inner circumferential surface of the through hole 61a is in slidable contact with the outer circumferential surface of the shaft member 8.

[0051] As shown in Figures 3, 4, and 5, the connecting wall 62 connects the pair of support walls 61. The connecting wall 62 is plate-shaped, extending from the main surface 50a along the X direction toward the -X side and having a plate surface that intersects with the Z direction. As shown in Figure 3, the support 60 is H-shaped when viewed along the X direction.

[0052] When viewed along the X direction, the connecting wall 62 coincides with the axis 61a1 of the through hole 61a. The axis 61a1 of the through hole 61a and the axis 8a of the shaft member 8 are approximately parallel to each other. Note that in Figure 5, the axes 61a1 and 8a are shown superimposed.

[0053] Furthermore, as shown in Figure 4, the thickness of the connecting wall 62 is smaller than the diameter of the through hole 61a. The connecting wall 62 is positioned on both sides of the through hole 61a in the X direction, which is perpendicular to the axis 61a1 of the through hole 61a.

[0054] Furthermore, as shown in Figures 4 and 5, the connecting wall 62 has a curved surface 62a that is continuous with the inner circumferential surface of the through hole 61a. When viewed along the Y direction, the curved surface 62a coincides with the inner circumferential surface of the through hole 61a. In other words, the curved surface 62a is located on the same plane as the inner circumferential surface of the through hole 61a. The curved surface 62a is in slidable contact with the outer circumferential surface of the shaft member 8.

[0055] The through-hole 61a and the curved surface 62a are formed, for example, by machining after the cover portion 50 has been formed by casting. Alternatively, the through-hole 61a and the curved surface 62a may be formed using a mold during the casting of the cover portion 50.

[0056] Furthermore, the thickness of the connecting wall 62 decreases as you move from the +X side towards the -X side along the X direction. Specifically, the plate surface on the +Z side of the connecting wall 62 is a tapered surface that slopes from the +Z side towards the -Z side along the Z direction as you move from the +X side towards the -X side along the X direction. On the other hand, the plate surface on the -Z side of the connecting wall 62 is a tapered surface that slopes from the -Z side towards the +Z side along the Z direction as you move from the +X side towards the -X side along the X direction.

[0057] As shown in Figure 5, the shaft member 8 has a head H, which corresponds to the head of a bolt, integrally attached to its first end. The shaft member 8 corresponds to the shaft portion of a bolt. When attaching the shaft member 8 to the support 60, the shaft member 8 is passed through the second bracket 7b and the through hole 61a of the support 60, and then a nut N is attached to the threaded portion at the second end of the shaft member 8. A fastening force acts on the support 60 from the head H and the nut N along the axis 8a direction of the shaft member 8.

[0058] As described above, according to this embodiment, the steering device 1 comprises a main body and a support 60 that supports the main body with respect to the shaft member 8. The support 60 comprises a pair of support walls 61 having through holes 61a through which the shaft member 8 passes, and a connecting wall 62 that is integral with the pair of support walls 61 and connects the pair of support walls 61. The connecting wall 62 is arranged on both sides of the through hole 61a in the X direction perpendicular to the axis 61a1 of the through hole 61a. The thickness of the connecting wall 62 is smaller than the diameter of the through hole 61a. According to this, the rigidity and strength of the support 60 against the force acting on the support 60 from the shaft member 8 can be improved compared to when the support 60 does not have connecting walls 62. When the rigidity of the support 60 is improved, vibrations of the steering wheel 2 transmitted from the vehicle body through the support 60 are suppressed when the mechanism restricts the oscillation of the steering column 20. In addition, by arranging the connecting walls 62 on both sides of the through hole 61a in the X direction, the rigidity and strength of the support 60 against the fastening force acting on the support 60 when attaching the shaft member 8 to the support 60 can be improved. Furthermore, since the thickness of the connecting wall 62 is smaller than the diameter of the through hole 61a, the occurrence of casting defects in the connecting wall 62 can be suppressed, and the strength of the connecting wall 62 can be improved. In addition, because the thickness of the connecting wall 62 is smaller than the diameter of the through hole 61a, the shaft member 8 can be visually seen between the pair of support walls 61 when attaching the shaft member 8 to the support 60, and it can be confirmed that the shaft member 8 is attached to the support 60.

[0059] Furthermore, the connecting wall 62 has a curved surface 62a that is continuous with the inner circumferential surface of the through hole 61a. According to this, the force acting from the shaft member 8 to the support 60 can be directly received by both the pair of support walls 61 and connecting walls 62. Therefore, it is possible to suppress the concentration of force acting from the shaft member 8 on the support 60, and the strength of the support 60 can be improved.

[0060] The main body also includes a steering shaft 10. The axis 10a of the steering shaft 10 is parallel to the X direction. The thickness of the connecting wall 62 decreases from the +X side in the X direction towards the -X side in the X direction. As described above, the plate surface of the connecting wall 62 is a tapered surface in which the thickness of the connecting wall 62 decreases as it moves from the +X side to the -X side along the X direction. Therefore, the direction of movement of the mold that forms the connecting wall 62 can be made parallel to the axis 10a of the steering shaft 10 which is along the X direction. Furthermore, as described above, the plate surfaces of the pair of support walls 61 are tapered surfaces, where the thickness of the pair of support walls 61 decreases as it moves from the +X side to the -X side along the X direction. Therefore, the direction of movement of the mold that forms the pair of support walls 61 can be made parallel to the axis 10a of the steering shaft 10 which is along the X direction. Consequently, the support 60 can be easily placed on the component of the steering device 1 (in this embodiment, the cover portion 50 included in the assist device 30) which is formed by a mold that moves parallel to the axis 10a of the steering shaft 10, without adding a sliding mold that intersects the X direction to the component mold. This makes it possible to reduce the cost of the mold and, furthermore, the cost of the steering device 1.

[0061] Furthermore, when viewed along the X direction, the connecting wall 62 coincides with the axis 61a1 of the through hole 61a. According to this, when viewed along the X direction, the connecting wall 62 coincides with the line of action of the force acting from the shaft member 8. Therefore, the strength of the support 60 against the force acting from the shaft member 8 can be further improved.

[0062] The main body also includes a reduction gear 34 connected to the output shaft 33a of the motor 33, and a housing 31 that houses the reduction gear 34. The support 60 is integrated with the housing 31, which includes the cover portion 50. When the steering device 1 is an electric power steering device, the support body 60 is integrally provided with the housing 31 that houses the reduction gear 34 of the motor 33. This improves the rigidity and strength of the support body 60 against the reaction force generated by the output of the motor 33 compared to when the support body 60 does not have a connecting wall 62.

[0063] Next, a modified example of the steering device 1 of this embodiment will be described.

[0064] The steering device 1 does not necessarily have to include the assist device 30. In this case, the steering shaft 10 and the steering column 20 constitute the "main body". In this case, the support 60 is located on the steering column 20 (for example, the second column 22) and is integrated with the steering column 20 (for example, the second column 22).

[0065] Furthermore, the connecting wall 62 may be positioned in a location that does not coincide with the axis 61a1 of the through hole 61a when viewed along the X direction.

[0066] Furthermore, the connecting wall 62 may have a shape that allows the entire outer surface of the connecting wall 62 to be visible when viewed from the -X side along the X direction. In this case, the outer surface of the connecting wall 62 on the +Z side has a slope that increases from the +X side towards the -X side along the X direction, and decreases from the +Z side towards the -Z side along the Z direction. On the other hand, the outer surface of the connecting wall 62 on the -Z side has a slope that increases from the +X side towards the -X side along the X direction, and decreases from the -Z side towards the +Z side along the Z direction. In this case, the support 60 can be easily placed on the components of the steering device 1 (e.g., the cover portion 50 and the second column 22) that are formed by a mold that moves parallel to the axis 10a of the steering shaft 10, without adding a sliding mold that intersects the X direction to the mold of the components. Similarly, the pair of support walls 61 may have a shape that allows the entire outer surface of the pair of support walls 61 to be visible when viewed along the X direction. In this case, the inner surface of the pair of support walls 61 in the Y direction has a slope such that the width of the inner surface of the pair of support walls 61 in the Y direction decreases as you move along the X direction from the -X side to the +X side. Also, in this case, the outer surface of the pair of support walls 61 in the Y direction has a slope such that the width of the outer surface of the pair of support walls 61 in the Y direction increases as you move along the X direction from the -X side to the +X side.

[0067] Furthermore, the connecting wall 62 may have a tapered surface as described above, or a shape without the above-described gradient. Also, the thickness of the connecting wall 62 may be uniform. Furthermore, the thickness of the connecting wall 62 may increase as it moves from the +X side to the -X side along the X direction.

[0068] Furthermore, the curved surface 62a of the connecting wall 62 may not be continuous with the inner circumferential surface of the through hole 61a, and may be located radially outward from the inner circumferential surface of the through hole 61a when viewed along the Y direction. In this case, the outer circumferential surface of the shaft member 8 does not come into contact with the curved surface 62a of the connecting wall 62. Alternatively, the connecting wall 62 may have a flat surface facing the shaft member 8 instead of the curved surface 62a.

[0069] Furthermore, the curved surface 62a of the connecting wall 62 may not be continuous with the inner circumferential surface of the through hole 61a, and may be located radially inward from the inner circumferential surface of the through hole 61a when viewed along the Y direction. In this case, the outer circumferential surface of the shaft member 8 does not come into contact with the inner circumferential surface of the through hole 61a.

[0070] Figure 6 is a perspective view of the cover portion 150 of the housing 31 in a steering device 1 according to one modified embodiment, viewed from the -X side. Figure 7 is a perspective view of the cover portion 150 of the housing 31 shown in Figure 6, viewed from the +X side. The cover portion 150 of this modified embodiment integrally includes a circumferential side wall 152b and a second storage portion 153, which correspond to the circumferential side wall 42b and second storage portion 43 included in the base portion 40 of the above embodiment. The cover portion 150 shown in Figure 7 shows a communication opening 152b1 corresponding to the communication opening 42b1 of the base portion 40. In this case, the base portion 40 included in the housing 31 has a cylindrical portion 41 and a bottom wall 42a, but does not have a circumferential side wall 42b and a second storage portion 43.

[0071] In this case, the stress in the housing 31 caused by the reaction force generated by the output of the motor 33 may be greater in the cover portion 150 than in the cover portion 50 which does not have the circumferential side wall 42b and the second storage portion 43. However, by having a connecting wall 62 in the support 60, the rigidity and strength of the support 60 against the reaction force generated by the output of the motor 33 can be improved.

[0072] Figure 8 is a cross-sectional view of the support 60 in the steering device 1 according to another modification of the embodiment. The steering device 1 according to this modification further comprises a cylindrical sleeve 170. The sleeve 170 passes through the through hole 61a and is attached to the through hole 61a. The shaft member 8 passes through the inside of the sleeve 170. The inner circumferential surface of the sleeve 170 is in slidable contact with the outer circumferential surface of the shaft member 8. The fastening force from the head H and nut N acts on the sleeve 170 and the support 60. The sleeve 170 can improve the rigidity and strength of the assist device 30.

[0073] Furthermore, the steering device 1 does not necessarily have a tilt mechanism that allows the steering column 20 and the steering shaft 10 to swing around the axis 8a of the shaft member 8. In this case, the support 60 is fixed to the shaft member 8 and the second bracket 7b in a state where it cannot swing. [Explanation of Symbols]

[0074] 1. Steering system 2 Steering Wheel 8 Shaft member 8a Axis of the shaft member 10 Steering shaft 10a Axis of the steering shaft 20 Steering column 30 Assist device 31 Housing 33 Motor 33a Motor output shaft 34 Reduction gear 60 Support 61 Supporting wall 61a Through hole 61a1 Axis of the through hole 62 Connecting Walls 62a curved surface

Claims

1. The main body and The system comprises a support that supports the main body portion with respect to the shaft member, The aforementioned support is A pair of support walls having through holes through which the shaft member passes, The pair of support walls are integrated with the connecting wall that connects the pair of support walls, and the system includes The connecting walls are arranged on both sides of the through hole in a first direction perpendicular to the axis of the through hole, The thickness of the connecting wall is smaller than the diameter of the through hole. Steering system.

2. The connecting wall has a curved surface that is continuous with the inner circumferential surface of the through hole. The steering device according to claim 1.

3. The main body is equipped with a steering shaft, The axis of the steering shaft is parallel to the first direction, The thickness of the connecting wall decreases as you move along the first direction from the first side in the first direction to the second side in the first direction. The steering device according to claim 1.

4. The connecting wall, when viewed along the first direction, coincides with the axis of the through hole. A steering device according to any one of claims 1 to 3.

5. The main body comprises a reduction gear connected to the output shaft of the motor and a housing that houses the reduction gear. The support is integrated with the housing. The steering device according to claim 1.

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