JP5222607B2 - Rear wheel independent steering system - Google Patents

Description

  The present invention relates to a rear-wheel independent steering device that controls the steering angle of a rear wheel by extending and contracting an actuator.

In the rear wheel independent steering system, the upper link and lower link are controlled by extending and retracting the actuator to suppress changes in camber angle and tread due to suspension bump (extension) and rebound (shrinkage), thereby improving steering stability performance. What was made to raise is known (for example, refer patent document 1).
Japanese Examined Patent Publication No. 6-47388

The actuator of Patent Document 1 is configured to rotate a male screw member of a feed screw mechanism by driving a motor and to feed the female screw member in a direction away from or closer to the motor by rotation of the male screw member.
By feeding the female screw member of the feed screw mechanism by driving the motor, the actuator expands and contracts, and the toe angle of the rear wheel can be controlled.
By controlling the toe angle of the rear wheel, it is said that the steering stability performance can be improved by suppressing changes in the camber angle and tread accompanying suspension bumps and rebound.

By the way, the rear-wheel independent steering device sends out the female screw member in the direction away from or near the motor by the rotation of the male screw member of the feed screw mechanism.
In order to allow the male screw member to move smoothly with respect to the female screw member, backlash (play (gap) between the tooth surfaces of the male screw member and the female screw member) is formed at the meshing portion of the male screw member and the female screw member. Yes.

For this reason, for example, when an external force or the like is applied to the rear wheel, the external force applied to the rear wheel is transmitted to the female screw member, and the female screw member may move (deviate) due to backlash.
That is, the feed screw mechanism may be displaced due to backlash.
When the feed screw mechanism is displaced due to backlash, it is conceivable that the rear wheel shifts in conjunction with the movement of the female screw member.

  An object of the present invention is to provide a rear wheel independent steering device that can prevent a feed screw mechanism from being displaced by an applied external force when an external force is applied to the rear wheel.

The invention according to claim 1 rotates the motor provided in the housing of the actuator, transmits the rotation of the motor to the feed screw mechanism, and feeds the female screw member in the axial direction by the rotation of the male screw member of the feed screw mechanism. In the rear-wheel independent steering device that controls the steering angle of the rear wheel by extending and contracting, a storage portion that is formed so as to penetrate perpendicularly to the axial direction of the female screw member and stores the resin member, and the storage A bolt member that is inserted into the resin member and abuts the front end portion of the resin member, and the male screw member is pressed by the resin member by abutting the front end portion of the bolt member against the resin member. and wherein the benzalkonium allowed to act a load on the threaded member.
The invention according to claim 2 is characterized in that a detected part is attached using the bolt member, and the position of the detected part is detected by the detecting part.

In the invention according to claim 1, the housing portion of the female screw member, provided with the resin member for applying a load to the male screw member.
Therefore, the movement between the female screw member and the male screw member can be prevented by the resin member.
Thereby, for example, when an external force or the like is applied to the rear wheel, there is an advantage that the feed screw mechanism can be prevented from being displaced by the applied external force.

Furthermore, the resin member can suppress the rigidity lower than that of the metal. Therefore, the resin member can be elastically deformed when the male screw member is rotated to send out the female screw member.
Thereby, there exists an advantage that a male screw member can be smoothly moved with respect to a female screw member.

In addition, since the resin member provided in the housing portion of the female screw member, a portion provided with no resin member, backlash is formed.
Therefore, the lubricating oil is supplied to the backlash, and the space between the male screw member and the female screw member not provided with the resin member can be well lubricated.

On the other hand, it is difficult for lubricating oil to be supplied to the portion where the resin member is provided. However, the resin material has a characteristic that a good slip can be obtained even in a non-lubricated state.
Therefore, the resin member formed of the resin material can obtain a good slip with respect to the male screw member even in a non-lubricated state.

In this way, the male screw member and the female screw member not provided with the resin member are well lubricated, and the resin member can move smoothly with respect to the female screw member by obtaining a good slip even in a non-lubricated state. There is an advantage that you can.
Moreover, in the invention which concerns on Claim 2, since the resin member can be pressed against a male screw member using the volt | bolt member which attaches a to-be-detected part, a number of parts can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that “front”, “rear”, “left”, and “right” indicate the direction viewed from the driver, the front side is Fr, the rear side is Rr, the left side is L, and the right side is R.

FIG. 1 is a perspective view showing a rear-wheel independent steering device (first embodiment) according to the present invention, and FIG. 2 is a view taken in the direction of arrow 2 in FIG.
The rear wheel independent steering device 10 includes an upper arm 12 and a lower arm 13 that are connected to a vehicle body 11 so as to be movable up and down, a knuckle 14 that is steerably connected to the upper arm 12 and the lower arm 13, an actuator 15 that steers the knuckle 14, This is a double wishbone type rear suspension for a four-wheel steering vehicle including a damper 16 with a suspension spring that cushions the vertical movement of the knuckle 14.
A rear wheel 18 is rotatably supported by the knuckle 14.

The upper arm 12 is connected to the vehicle body 11 by a rubber bush joint 21, 21 at the base end so as to be movable up and down.
The lower arm 13 is connected to the vehicle body 11 by a rubber bush joint 22.
The upper and lower portions of the knuckle 14 are connected to the distal end portion of the upper arm 12 and the distal end portion of the lower arm 13 via ball joints 23 and 24.

The actuator 15 has a proximal end portion connected to the vehicle body 11 via a rubber bush joint 26 and a distal end portion connected to a rear portion of the knuckle 14 via a rubber bush joint 27.
The damper 16 with suspension spring has an upper end portion 16 a provided on the vehicle body 11 (specifically, the upper wall 19 of the suspension tower), and a lower end portion 16 b connected to the upper portion of the knuckle 14 via a rubber bush joint 28. .

According to the rear wheel independent steering device 10, by extending the actuator 15, the rear portion of the knuckle 14 is pressed outward in the vehicle width direction, and the toe angle of the rear wheel 18 can be controlled in the toe-in direction.
On the other hand, by contracting the actuator 15, the rear portion of the knuckle 14 is pulled inward in the vehicle width direction, and the toe angle of the rear wheel 18 can be controlled in the toe-out direction.
That is, the actuator 15 is a toe control actuator that controls the toe angle.

Therefore, in addition to steering the front wheels by operating a normal steering wheel (not shown), the toe angle of the rear wheels 18 can be controlled to improve the straight running stability performance and turning performance of the vehicle.
The toe angle of the rear wheel 18 is controlled according to, for example, the vehicle speed and the steering angle of the steering wheel.
Hereinafter, the actuator 15 will be described in detail with reference to FIGS.

3 is a cross-sectional view taken along line 3-3 of FIG.
The actuator 15 includes a first housing 31 provided with a rubber bush joint 26 connected to the vehicle body 11 (see FIG. 2), a second housing 33 provided integrally with the first housing 31 with bolts 32. An output rod 34 slidably supported by the second housing 33 is provided.
The output rod 34 is provided with a rubber bush joint 27 connected to the knuckle 14 side.

The first and second housings 31 and 33 are connected together by fastening flanges 31a and 33a with bolts 32. That is, the housing 30 is formed by the first and second housings 31 and 33.
The first housing 31 houses a motor 38 therein.
The second housing 33 stores therein a reduction gear 41 connected to the motor 38, a coupling 42 connected to the reduction gear 41, and a feed screw mechanism 43 connected to the coupling 42.

The motor 38 includes a cup-shaped yoke 45 and a bearing holder 47 fastened to the flange 45a of the yoke 45 with bolts 46.
The motor 38 is attached to the first housing 31 by screwing bolts 46 to fasten the yoke 45 and the bearing holder 47 to the first housing 31.

An annular stator 48 is supported on the inner peripheral surface of the yoke 45, and a rotor 49 is disposed in the stator 48.
One end of the rotating shaft 51 of the rotor 49 is rotatably supported on the bottom of the yoke 45 via a ball bearing 52, and the other end is rotatably supported on a bearing holder 47 via a ball bearing 53.
The bearing holder 47 has a brush 55 that is in sliding contact with the commutator 54 of the rotating shaft 51 supported on the inner surface thereof.
A conducting wire 56 extending from the brush 55 is drawn to the outside through a grommet 57.

In the reduction gear 41, a first planetary gear reduction mechanism 61 and a second planetary gear reduction mechanism 62 are connected in series.
By connecting the first and second planetary gear reduction mechanisms 61 and 62 in series, the rotation of the motor 38 can be greatly reduced by the reduction gear 41 and transmitted to the coupling 42.
The rotation transmitted to the coupling 42 is transmitted to the input flange 81 of the feed screw mechanism 43.

FIG. 4 is an enlarged view of part 4 of FIG.
A first slide bearing 104 is provided on the inner peripheral surface of the intermediate portion in the axial direction of the second housing 33, and an end member 105 is screwed to the axial end portion of the second housing 33.
A second slide bearing 106 is provided on the inner peripheral surface of the end member 105.
The output rod 34 is slidably supported by the first and second slide bearings 104 and 106.

A feed screw mechanism 43 is accommodated in the output rod 34.
The feed screw mechanism 43 includes a male screw member 107 coaxially provided on the input flange 81 (see FIG. 3) and a female screw member 108 screwed to the outer periphery of the male screw member 107.
One end side (right side) of the male screw member 107 passes through the center of the input flange 81 and is fastened with a nut 112 (see FIG. 3).
The female screw member 108 is fitted to the inner peripheral surface of the hollow output rod 34, and the outer periphery on the other end side (left side) is screwed to the inner periphery of the output rod 34 by a screw coupling portion 114.

The feed screw mechanism 43 can move the female screw member 108 in the direction of the axis 111 by transmitting the rotation of the input flange 81 to the male screw member 107.
Therefore, the output rod 34 can be moved in the direction of the axis 111 integrally with the female screw member 108.

Here, the actuator 15 is provided with position detecting means 120 that detects the moving position of the output rod 34 and feeds back the detected moving position to a control device (not shown).
The position detection unit 120 includes a detection unit 122 fixed to the outer periphery of the output rod 34 with a bolt 121 and a detection unit 123 that magnetically detects the position of the detection unit 122.

The detection unit 123 is housed in a sensor main body 124 provided in the second housing 33.
As an example, the detected part 122 uses a permanent magnet.
As an example, the detection unit 123 uses a coil or the like.
An opening 33 b is formed in the second housing 33. By forming the opening 33 b, it is possible to prevent the detected portion 122 from interfering with the second housing 33 when the detected portion 122 moves with the movement of the output rod 34.

Returning to FIG. 3, according to the actuator 15, the motor 38 provided in the housing 30 can be rotated, and the rotation of the motor 38 can be transmitted to the male screw member 107 via the input flange 81.
By rotating the male screw member 107, the female screw member 108 can be sent in the direction of the axis 111 (axial direction).
The steering angle of the rear wheel 18 (see FIG. 2) can be controlled by feeding the female screw member 108 and extending and contracting the actuator 15.

5 is an enlarged view of part 5 of FIG. 4, and FIG. 6 is a cross-sectional view showing a state in which the resin member is removed from the male screw member of the feed screw mechanism according to the present invention.
The male screw member 107 of the feed screw mechanism 43 is a screw member formed entirely of metal.
The female screw member 108 is a screw member in which an annular resin member 131 formed of a resin material is provided at one end portion (a part of one screw member) 108a, and the other metal female screw portion 132 is formed of metal.
That is, an annular housing recess 134 is formed on one end (right end) 108 a side of the female screw member 108, and an annular resin member 131 is integrally provided in the annular housing recess 134.

  A backlash (play (gap) between the tooth surface 107 a and the tooth surface 132 a) 135 is formed between the tooth surface 107 a of the male screw member 107 and the tooth surface 132 a of the metal female screw portion 132.

By forming the backlash 135 between the tooth surface 107a and the tooth surface 132a, the male screw member 107 can be smoothly moved with respect to the metal female screw portion 132.
Therefore, the lubricating oil is supplied to the backlash 135, and the space between the tooth surface 107a and the tooth surface 132a can be satisfactorily lubricated with the lubricating oil.

The outer periphery of the resin member 131 is formed in an annular shape, and a resin female screw 137 is formed on the inner periphery.
The resin female screw 137 is screwed to the tooth surface 107a of the male screw member 107 in a state where the backlash 135 is not formed.

That is, as shown in FIG. 6, in a state where the resin female screw 137 is not screwed, the lead L1 of the resin female screw 137 is formed longer than the lead L2 of the male screw member 107.
Therefore, the tooth portion of the resin female screw 137 is screwed in a compressed state between the tooth surfaces 107 a of the male screw member 107.
The tooth surface 137a of the resin female screw 137 is in contact with the tooth surface 107a (the other screw member) of the male screw member 107 in a state where a load is applied.

Here, by forming the resin female screw 137 with a resin material, the rigidity can be suppressed smaller than that of a metal screw. Therefore, when the male screw member 107 is rotated and the female screw member 108 is sent out, the resin female screw 137 can be elastically deformed.
Thereby, the male screw member 107 can be smoothly moved with respect to the female screw member 108 even in a state where there is no backlash 135 between the tooth surface 137 a of the resin female screw 137 and the tooth surface 107 a of the male screw member 107.

  In addition, the resin material has a characteristic that a good slip can be obtained even in a non-lubricated state. Therefore, the resin female screw 137 formed of the resin material can obtain a good slip with respect to the male screw member 107 even in a non-lubricated state.

  Thus, the space between the male screw member 107 and the metal female screw portion 132 can be satisfactorily lubricated, and the resin female screw 137 can obtain a good slip even in a non-lubricated state. It can move smoothly.

As described above, the feed screw mechanism 43 is provided with the resin member 131 at the one end portion 108 a of the female screw member 108.
Therefore, movement (shift) between the female screw member 108 and the male screw member 107 can be prevented by the resin member 131.
Thereby, for example, when an external force or the like is applied to the rear wheel 18 (see FIG. 2), the feed screw mechanism 43 can be prevented from being displaced by the applied external force.

Next, an example in which the axial load of the male screw member 107 is supported by the female screw member 108 will be described with reference to the graph of FIG.
FIG. 7 is a graph illustrating an example in which the axial load of the male screw member according to the first embodiment is supported by the female screw member.
The vertical axis represents the axial load F of the male screw member 107, and the horizontal axis represents the amount of deflection δ of the resin member 131.
Here, the axial load refers to a load acting in the axial direction of the male screw member 107.
This axial load is generated, for example, when an external force applied to the rear wheel is transmitted to the female screw member.
The graph G1 shows the axial load F of the male screw member 107 (that is, the axial load acting on the entire female screw member 108) F.
Graph G2 shows the axial load F acting on the resin female screw 137.

As shown in the graph G1, when 0 to F1 acts on the male screw member 107 as the axial load F, the deflection amount δ of the resin member 131 becomes 0 to δ1.
Here, the deflection amount δ1 is equal to the size of the backlash.
Therefore, the axial load F of the male screw member 107 can be received by the resin member 131 of the female screw member 108 when the deflection amount δ of the resin member 131 is between 0 and δ1.
Thereby, when 0 to F1 acts on the male screw member 107 as the axial load F, the male screw member 107 can be supported by the resin member 131 and the male screw member 107 can be prevented from moving in the axial direction.

Thus, even when an axial load is generated on the male screw member 107 within the backlash range, the resin member 131 can prevent the male screw member 107 from moving in the axial direction.
Therefore, for example, when an external force or the like is applied to the rear wheel 18, the external force applied to the rear wheel 18 is transmitted to the female screw member 108, and the female screw member 108 can be prevented from moving (displaced) inadvertently.

On the other hand, when F1-F2 acts on the male screw member 107 as the axial load F, the deflection amount δ of the resin member 131 becomes δ1-δ2.
Here, the deflection amounts δ1 to δ2 exceed the size of the backlash.
Therefore, the axial load F of the male screw member 107 can be received by the resin member 131 and the metal female screw portion 132 when the deflection amount δ of the resin member 131 is between δ1 and δ2.

  Thereby, when F1-F2 acts on the male screw member 107 as the axial load F, the male screw member 107 is supported by the resin member 131 and the metal female screw portion 132 to prevent the male screw member 107 from moving in the axial direction. Can do.

Thus, when an axial load is generated on the male screw member 107 outside the backlash range, the resin member 131 and the metal female screw portion 132 can prevent the male screw member 107 from moving in the axial direction.
Therefore, for example, when an external force or the like is applied to the rear wheel 18, the external force applied to the rear wheel 18 is transmitted to the female screw member 108 and the female screw member 108 can be prevented from moving (displaced) inadvertently.

Incidentally, the axial load F3 of the axial load F2 of the male screw member 107 can be received by the metal female screw portion 132 between the deflection amount δ2 of the resin member 131.
Therefore, the axial load acting on the resin member 131 can be suppressed to F4.
Thereby, the durability of the resin member 131 can be ensured satisfactorily.

  Next, the feed screw mechanisms of the second to sixth embodiments will be described with reference to FIGS. In the feed screw mechanisms of the second to sixth embodiments, the same or similar members as those of the feed screw mechanism 43 of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

FIG. 8 is a cross-sectional view showing a feed screw mechanism (second embodiment) according to the present invention.
In the feed screw mechanism 140 of the second embodiment, a resin member 141 made of a resin material is provided in a part (a part of one screw member) 107b of the male screw member 107, and the other metal male screw part 142 is provided. Is made of metal.
That is, the housing recess 145 is formed in the groove 144 of the male screw member 107, and the resin member 141 is housed in the housing recess 145.

By forming the resin member 141 from a resin material, the rigidity can be reduced compared to a metal screw. Therefore, the resin member 141 can be elastically deformed when the resin member 141 is rotated and the female screw member 108 is sent out.
Thereby, the male screw member 107 (resin member 141) can be smoothly moved with respect to the female screw member 108 even in a state where the backlash 135 is not present between the resin member 141 and the female screw member 108.

In addition, the resin material has a characteristic that a good slip can be obtained even in a non-lubricated state. Therefore, the resin member 141 formed of a resin material can obtain a good slip with respect to the male screw member 107 even in a non-lubricated state.
Thereby, the male screw member 107 can be smoothly moved with respect to the female screw member 108.

As described above, the feed screw mechanism 140 can prevent the resin member 141 from moving between the female screw member 108 and the male screw member 107 by providing the male screw member 107 with the resin member 141.
Thereby, for example, when an external force or the like acts on the rear wheel 18 (see FIG. 2), it is possible to prevent the feed screw mechanism 140 from being displaced by the applied external force.
That is, according to the feed screw mechanism 140 of the second embodiment, the same effect as that of the feed screw mechanism 43 of the first embodiment can be obtained.

  In the second embodiment, an example in which only one resin member 141 is provided has been described. However, the present invention is not limited to this, and the resin member 141 may be provided at a plurality of locations.

FIG. 9 is a cross-sectional view showing a feed screw mechanism (third embodiment) according to the present invention.
In the feed screw mechanism 150 of the third embodiment, a resin member 151 made of a resin material is provided on a part (a part of one screw member) 107c of the male screw member 107, and the other metal male screw part 152 is provided. Is made of metal.

That is, the storage recess 155 is formed in the tooth portion 154 of the male screw member 107, and the resin member 151 is stored in the storage recess 155.
According to the feed screw mechanism 150 of the third embodiment, the same effects as those of the feed screw mechanism 140 of the second embodiment can be obtained.

  In the third embodiment, an example in which only one resin member 151 is provided has been described. However, the present invention is not limited to this, and the resin member 151 may be provided at a plurality of locations.

FIG. 10 is a cross-sectional view showing a feed screw mechanism (fourth embodiment) according to the present invention.
The feed screw mechanism 160 of the fourth embodiment is one in which a compression spring 161 is housed in the housing recess 145, and the other configuration is the same as the feed screw mechanism 140 of the second embodiment.
By storing the compression spring 161 in the storage recess 145, the resin member 141 can be pressed in the direction of being pushed out of the storage recess 145 by the compression spring 161.

As a result, even if the resin member 141 slides along the female screw member 108 and the tip portion of the resin member 141 is worn, a load is always applied to the female screw member 108 at the tip portion of the resin member 141. it can.
Furthermore, according to the feed screw mechanism 160 of the fourth embodiment, the same effect as that of the feed screw mechanism 140 of the second embodiment can be obtained.

  In the fourth embodiment, an example in which only one resin member 141 is provided has been described. However, the present invention is not limited to this, and the resin member 141 may be provided at a plurality of locations.

FIG. 11 is a sectional view showing a feed screw mechanism (fifth embodiment) according to the present invention.
In the feed screw mechanism 170 according to the fifth embodiment, the housing portion 171 is penetrated through the male screw member 107 in a direction orthogonal to the axial direction, and the pair of resin members 141 are provided facing the openings 171a and 171a of the housing portion 171. The compression spring 172 is accommodated between the pair of resin members 141, and other configurations are the same as those of the feed screw mechanism 160 of the fourth embodiment.

According to the feed screw mechanism 170 of the fifth embodiment, since the pair of resin members 141 can be pressed using one compression spring 172, the number of parts can be reduced.
Furthermore, according to the feed screw mechanism 170 of the fifth embodiment, the same effects as those of the feed screw mechanism 160 of the fourth embodiment can be obtained.

FIG. 12 is a sectional view showing a feed screw mechanism (sixth embodiment) according to the present invention.
In the feed screw mechanism 180 of the sixth embodiment, a resin member 181 formed of a resin material is provided in a part (a part of one screw member) 108b of the female screw member 108, and the other metal female screw part 182 is provided. Is made of metal.

That is, the housing portion 183 perpendicular to the axial direction passes through the female screw member 108, and the resin member 181 is housed in the housing portion 183.
The storage portion 183 is formed coaxially with the female screw 34a to which the bolt 184 is screwed. The bolt 184 has a tip 184 a protruding outward from the storage portion 183 with the block 186 attached to the output rod 34.

In the block 186, the detected part 122 is provided.
The front end 184 a of the bolt 184 contacts the outer end of the resin member 181, whereby the inner end of the resin member 181 can be pressed against the blade edge 107 d of the male screw member 107.
By pressing the inner end of the resin member 181 against the cutting edge 107d of the male screw member 107, a load can be applied to the cutting edge 107d of the male screw member 107.

Therefore, according to the feed screw mechanism 180 of the sixth embodiment, the same effect as that of the feed screw mechanism 140 of the second embodiment can be obtained.
Furthermore, since the resin member 181 can be pressed against the blade edge 107d of the male screw member 107 using the bolt 184 for attaching the block 186, the number of parts can be reduced.

  The feed screw mechanism 43, the male screw member 107, the female screw member 108, the resin members 131, 141, 151, 181 and the like shown in the above embodiment are not limited to the illustrated shapes, and can be appropriately changed.

  INDUSTRIAL APPLICABILITY The present invention is suitable for application to an automobile provided with a rear wheel independent steering device that controls the steering angle of a rear wheel by extending and contracting an actuator.

1 is a perspective view showing a rear-wheel independent steering device (first embodiment) according to the present invention. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is an enlarged view of part 4 of FIG. 3. FIG. 5 is an enlarged view of part 5 of FIG. 4. It is sectional drawing which shows the state which removed the resin member from the external thread member of the feed screw mechanism which concerns on this invention. It is a graph explaining the example which supports the axial load of the external thread member which concerns on 1st Embodiment with an internal thread member. It is sectional drawing which shows the feed screw mechanism (2nd Embodiment) which concerns on this invention. It is sectional drawing which shows the feed screw mechanism (3rd Embodiment) which concerns on this invention. It is sectional drawing which shows the feed screw mechanism (4th Embodiment) which concerns on this invention. It is sectional drawing which shows the feed screw mechanism (5th Embodiment) which concerns on this invention. It is sectional drawing which shows the feed screw mechanism (6th Embodiment) which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Rear wheel independent steering device, 15 ... Actuator, 18 ... Rear wheel, 30 ... Housing, 38 ... Motor, 43 ... Feed screw mechanism, 107 ... Male screw member, 107b, 107c ... A part of male screw member (one screw member) 108 ... female screw member, 108a ... one end of the female screw member (part of one screw member), 108b ... part of the female screw member (part of one screw member) , 122 ... detected portion, 123: Detection unit 131, 141, 151, 181: Resin member , 183: Storage unit, 184: Bolt member (bolt), 184a: Tip portion of the bolt member .

Claims (2)

By rotating the motor provided in the housing of the actuator, transmitting the rotation of the motor to the feed screw mechanism, and rotating the male screw member of the feed screw mechanism in the axial direction to extend and contract the actuator, the rear wheel In the rear wheel independent steering device that controls the steering angle of
A storage portion that is formed so as to penetrate perpendicularly to the axial direction of the female screw member , and in which a resin member is stored;
A bolt member inserted into the storage portion and abutting a tip portion against the resin member,
Wherein by the tip of the bolt member abuts against the resin member, wheel independent steering device after which presses the male screw member in said resin member and said and Turkey allowed to act a load to the male screw member. The rear wheel independent steering device according to claim 1, wherein a detected portion is attached using the bolt member, and a position of the detected portion is detected by the detecting portion.

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