JP2010253990A - Wheel steering device, and structure and method for mounting wheel steering device on vehicle body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize an adverse effect of a rear wheel steering device onto steering angle control of right and left wheels even if cracking or fracture occurs on one bolt fastening hole side by an excessive input. <P>SOLUTION: This device is a wheel steering device capable of steering right and left wheels by transmitting torque from an actuator 4 fixed on a cylinder member 3 to a rod. Two bolt fastening holes 5, 6 spaced from each other in the rod axial direction S are formed in the cylinder member 3, sandwiching a torque transmission portion therebetween. The one bolt fastening hole is taken as a slotted hole. A protrusion portion 11 is provided between the slotted bolt fastening hole and the torque transmission portion. In assembling a vehicle body, the protrusion portion 11 is inserted into an opening portion 24 formed in the vehicle body. A play of the protrusion portion 11 relative to the opening portion 24 in the rod axial direction S is set to be larger than a play between the other bolt fastening hole and a bolt inserted into the bolt fastening hole in the rod axial direction S under a state assembled on the vehicle body. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a steering device that steers left and right wheels with torque from an actuator, such as a rear wheel steering device, a structure for mounting the wheel steering device on a vehicle body, and a method for mounting the vehicle on the vehicle body.

  As a rear wheel steering device, for example, there is a device described in Patent Document 1. This device is a cylinder member whose axis is directed in the vehicle width direction, and supports a rod (rack shaft) so as to be movable in the axial direction. Further, the torque of an actuator including a gear box and a motor can be transmitted to the rod via a rack and pinion mechanism. The actuator is fixed to the cylinder member and integrated with the actuator.

  Also, two bolt fastening holes are provided in the cylinder member of the rear wheel steering device. The two bolt fastening holes are separated from each other in the rod axis direction with the actuator interposed therebetween. Then, the rear wheel steering device is attached to the vehicle body by bolting the two bolt fastening holes to the vehicle body.

JP-A-7-186978

  If there is an excessive input to the rod of the rear wheel steering device, the input is input from the rod to the cylinder member via the actuator. Due to the excessive input, a large stress concentration is generated in one of the two bolt fastening holes for attaching the cylinder member to the vehicle body or in the vicinity thereof.

When the stress concentration is excessive, the rear wheel steering device is not sufficiently fixed to the vehicle body on the one bolt fastening hole side, and the rear wheel steering device is likely to swing around the other bolt fastening hole. There is a fear.
The present invention pays attention to the above points, and it is an object of the present invention to restrict the occurrence of swinging of the wheel turning device to a small value even if there is an excessive input to the rod.

  In order to solve the above problems, the present invention is a wheel steering device capable of steering left and right wheels by transmitting torque from an actuator fixed to a cylinder member to a rod. The cylinder member is provided with two bolt fastening holes for mounting the vehicle body that are spaced apart from each other in the rod axis direction across the position of the torque transmission portion from the actuator to the rod. One of the two bolt fastening holes is a long hole. A protrusion projecting in a direction crossing the rod axis direction is provided between the bolt fastening hole of the elongated hole and the position of the torque transmission unit. When the vehicle body is assembled, the protrusion is inserted into an opening provided in the vehicle body. The play in the rod axis direction with respect to the opening of the protrusion is larger than the play in the rod axis direction between the other bolt fastening hole and the bolt inserted into the bolt fastening hole in a state assembled to the vehicle body. Set.

  According to the present invention, when an excessive input to the rod causes a state where the fixing on the other bolt fastening hole side which is not a long hole is insufficient, the position of one bolt fastening hole (long hole) and The wheel steering device can be held in the vehicle body at two locations separated in the rod axis direction from the position of the protrusion. As a result, even if a state in which the fixing on the other bolt fastening hole side which is not a long hole is insufficient due to an excessive input occurs, the occurrence of swinging of the wheel turning device can be restricted to a small amount.

It is a perspective view which shows the suspension member which comprises the rear-wheel steering apparatus which concerns on embodiment based on this invention, and a vehicle body. It is a fragmentary sectional view which shows the rear-wheel steering apparatus which concerns on embodiment based on this invention. It is a perspective view explaining the shape of the projection part which concerns on embodiment based on this invention. It is a figure explaining the projection part which concerns on embodiment based on this invention. It is sectional drawing seen from the vehicle rear which shows a projection part when a rear-wheel steering apparatus is assembled | attached to a vehicle body. It is a figure explaining the process at the time of inserting a volt | bolt in the 1st volt | bolt fastening hole which concerns on embodiment based on this invention, (a) is a perspective view, (b) is an AA arrow directional view of (a). It is. It is a figure which shows the state of the projection part at the time of adjusting the inclination of the rear-wheel steering apparatus which concerns on embodiment based on this invention. It is a figure explaining the process at the time of inserting a bolt into the 2nd bolt fastening hole which concerns on embodiment based on this invention. It is a schematic diagram which shows the state at the time of fracture | rupture generation | occurrence | production concerning embodiment based on this invention. It is sectional drawing which shows the example of a state of the projection part at the time of fracture | rupture generation | occurrence | production. It is a figure explaining a fuse site | part. It is a typical perspective view explaining another bolt fastening hole which concerns on embodiment based on this invention. It is BB sectional drawing in FIG.

Next, embodiments of the present invention will be described with reference to the drawings.
In this embodiment, a rear wheel steering device will be described as an example as a wheel steering device. Moreover, in this embodiment, the case where a rear-wheel steering apparatus is attached to the suspension member 20 which comprises a part of vehicle body from the vehicle front-back direction back is illustrated.
FIG. 1 is a perspective view showing a rear wheel steering device 1 and a suspension member according to the present embodiment.

(Constitution)
As shown in FIGS. 1 and 2, the rear wheel steering apparatus 1 includes a rod 2, a cylinder member 3, and an actuator 4.
That is, the cylinder member 3 supports the rod 2 so as to be movable (guideable) in the axial direction. The actuator 4 is fixed integrally with the cylinder member 3. The actuator 4 includes, for example, an electric motor 4A and a gear box 4B. The output torque of the electric motor 4A is transmitted to the gear in the gear box 4B, and is transmitted from the pinion shaft of the gear box 4B to the rack shaft provided on the rod 2. The meshing position of the pinion shaft and the rack shaft becomes the torque transmission unit 10 from the actuator 4 to the rod 2. That is, in this embodiment, the rack and pinion mechanism is the torque transmission unit 10. Further, tie rods 9 are connected to the left and right ends of the rod 2 respectively. In FIG. 2, reference numeral 30 indicates a bearing for supporting the rod 2 on the cylinder member 3.

In this embodiment, it is assumed that the actuator 4 is located behind the rod 2 in the vehicle front-rear direction.
The cylinder member 3 is provided with two bolt fastening holes 5 and 6. Reference numerals 7 and 8 are bolt fastening hole brackets for forming the bolt fastening holes 5 and 6. The two bolt fastening holes 5 and 6 are spaced apart from each other in the rod axial direction S across the position of the torque transmission unit 10.

Here, the position of the torque transmitting portion 10 is eccentric in the rod axial direction S from the axial center position of the cylinder member 3.
Of the two bolt fastening holes 5 and 6, the first bolt fastening hole 5 which is the bolt fastening hole on the side close to the position of the torque transmitting portion 10 is a round hole. Moreover, let the 2nd bolt fastening hole 6 which is a bolt fastening hole on the side far from the said torque transmission part 10 position be a long hole. The long hole has its long diameter directed in the rod axial direction S. In addition, the two bolt fastening holes 5 and 6 are arranged with their axes directed in the vehicle front-rear direction.

  Further, the cylinder member 3 is provided with a protrusion 11. The protruding portion 11 is provided between the position of the second bolt fastening hole 6 that is the elongated hole and the position of the torque transmitting portion 10, and the protruding portion 11 protrudes in a direction crossing the rod axial direction S. . The protrusion 11 of the present embodiment protrudes forward from the front of the cylinder member 3 in the vehicle front-rear direction. The protrusion 11 will be described later.

Here, the suspension member 20 will be described.
The suspension member 20 includes left and right side members 21 extending in the vehicle front-rear direction, and a front cross member 22 and a rear cross member 23 that connect the side members 21 to each other. Each side member 21 is provided with an insulator 25 at its end. The suspension member 20 is elastically supported by a body frame (not shown) by the four insulators 25. Further, the vehicle body side end portions of suspension links (not shown) are connected to the side members 21 and the rear cross member 23 so as to be swingable. The wheel-side end of the suspension link is connected to a wheel support member that supports the wheel.

The rear cross member 23 has a closed cross-sectional structure having two vertical wall surfaces facing each other in the vehicle longitudinal direction. This closed cross-sectional structure is formed by connecting two U-shaped members opposed to each other in the vehicle longitudinal direction by welding or the like. Here, normally, in order to position the two U-shaped members, a positioning round hole 24 is opened near the center in the vehicle width direction. The positioning round hole 24 is open in the vehicle longitudinal direction because the two vertical wall surfaces oppose each other in the vehicle longitudinal direction.
In the present embodiment, this existing round hole is used as the opening 24. However, an opening for inserting the protrusion may be separately formed in the rear cross member 23.

Next, the shape of the protrusion 11 will be described.
Here, FIG. 3 is a perspective view showing the shape of the protrusion 11. FIG. 4 is a top view and a side view of the protrusion 11 when the protrusion is inserted. FIG. 5 is a cross-sectional view showing the position of the protrusion 11 with respect to the opening 24 when the rear wheel steering device 1 is assembled to the vehicle body.
In the present embodiment, the protrusion 11 is a plate member having a triangular shape such as a right triangle as viewed from the rod axis direction S (a direction orthogonal to the protrusion direction of the protrusion 11).

The lower surface 11a of the protrusion 11 is substantially horizontal as viewed from the vehicle width direction. However, the lower surface 11a of the protrusion 11 may be inclined so as to go downward as it goes forward in the vehicle front-rear direction as seen from the vehicle width direction. Moreover, it does not need to extend linearly, and may be curvilinear, such as an upwardly convex arc shape.
As shown in FIG. 5, the cross-sectional shape of the lower surface 11 a of the protrusion 11 is an arc shape protruding downward along the vehicle width direction. The arc shape may be a part of a perfect circle or may be formed from a part such as an ellipse. In the present embodiment, the cross-sectional shape of the upper surface 11b of the protrusion 11 is also an arc shape that is convex upward along the vehicle width direction.

  However, the vertical cross-sectional shape of the protrusion 11 cut in the vehicle width direction is a substantially quadrangular shape with the long side in the vertical direction, and corners 11c are formed at the vehicle width direction end portions of the lower surface and the upper surface, respectively. ing. That is, a corner portion 11c is formed at a lower end portion and an upper end portion that are separated in the vertical direction, and the corner portion 11c protrudes in the vehicle width direction and can come into contact with the opening portion 24. If the protrusion 11 is a plate-like member, the corner 11c can be easily provided. In the present embodiment, the tip of the corner 11c is slightly rounded.

In addition, the cross section of the protrusion 11 is made triangular as described above, so that it becomes smaller toward the tip. The cross section is a cross section orthogonal to the extending direction of the protrusion 11.
Further, according to the opening 24, the play in the rod axis direction S with respect to the opening 24 of the protrusion 11 is in the state assembled to the vehicle body as shown in FIG. Play in the rod axial direction S with the bolt inserted into the first bolt fastening hole 5 and rod axial direction S between the second bolt fastening hole 6 and the bolt inserted into the second bolt fastening hole 6 Set to be bigger than play.

That is, when the vehicle body is assembled, the play in the rod axis direction S has the following relationship.
Play between first bolt fastening hole 5 and bolt <Play between second bolt fastening hole 6 and bolt <Play between second bolt fastening hole 6 and bolt <Play against opening 24 of projection 11 The play in the vertical direction with respect to the opening 24 of the protrusion 11 is smaller than the play in the rod axial direction S with respect to the opening 24 of the protrusion 11.

The play in the vertical direction with respect to the opening 24 of the protrusion 11 is less than the radial clearance between the cylinder member inner diameter surface and the rod, for example, when the vehicle body is assembled.
Further, the position of the protrusion 11 is set so as to be positioned as much as possible in the center of the opening when assembled to the vehicle body, for example.

(About installation)
Next, attachment of the rear wheel steering device 1 will be described.
First, as shown in FIG. 1, the assembly operator holds the rear wheel steering device 1 with both hands and carries it to the vicinity of the suspension member 20 of the vehicle body to which the rear wheel steering device 1 is assembled. Note that the weight of the rear wheel steering device 1 itself is, for example, about 9 kg, and it is difficult to carry it unless both hands are used.

Then, the rear wheel steering device 1 is brought closer to the rear cross member 23 of the suspension member 20 from the rear in the vehicle front-rear direction, and the protrusion 11 of the rear wheel steering device 1 is opened in the rear cross member 23 as shown in FIG. It is inserted into the opening 24 (round hole).
At this time, the cross section of the protrusion 11 becomes smaller toward the tip. For this reason, it becomes easy to insert the projection 11 into the opening 24, and the mounting workability of the rear wheel steering device 1 is good.

  By inserting as described above, the weight of the rear wheel steering device 1 is temporarily supported by the vehicle body via the protrusion 11. For this reason, the rear-wheel steering apparatus 1 can be hold | maintained with one hand. For example, the actuator 4 may be grasped with one hand (left hand). Here, by providing the projection 11 between the two bolt fastening holes 5, 6, the rear wheel steering device 1 is temporarily supported in a state where the projection 11 is centered around the position of the lower end of the projection 11. The From this point, it is preferable that the protrusion 11 is provided in the central portion in the axial direction.

Next, as shown in FIG. 6, while holding the rear wheel steering device 1 with the left hand, the vertical inclination of the rear wheel steering device 1 is adjusted around the lower surface 11 a of the protrusion 11, and the round hole side is adjusted. The bolt 33 is inserted into the first bolt fastening hole 5 which is a (reference hole).
At this time, the following effect | action generate | occur | produces by making the cross-sectional shape of the lower surface 11a of the projection part 11 into the circular arc shape convex below along the vehicle width direction.

  That is, when the rear wheel steering device 1 is assembled to the vehicle, if the protrusion 11 is inserted and placed in the opening 24 (round hole) on the vehicle body side, the lower surface 11a of the protrusion 11 is placed below the opening 24 by its own weight. Abut. Then, as shown in FIG. 7, the rear wheel steering device 1 is smoothly tilted while being supported by the protrusion 11 by rolling the arc portion of the lower surface of the protrusion 11 along the opening cross section on the lower side of the opening 24. Can do. Therefore, the positioning work for inserting the fastening bolt 33 of the rear wheel steering device 1 into the first fastening hole 5 while using the protrusion 11 as temporary support is facilitated.

Moreover, since the installation height of the protrusion 11 is higher than the center of gravity of the actuator 4, the stability of the rear wheel steering device 1 when the protrusion 11 is temporarily supported by being placed on the opening 24 is improved. Also from this point, it is easy to adjust the inclination of the rear wheel steering device 1 with the opening 24 as a fulcrum.
Adjusting as described above, the bolt 33 inserted into the first bolt fastening hole 5 on the reference hole side is temporarily tightened.

After the temporary tightening, the weight of the rear wheel steering device 1 is supported at the two locations of the bolt 33 on the first bolt fastening hole 5 (reference hole) side and the temporarily supporting protrusion 11. In this state, the rear wheel steering device 1 can be held on the suspension member 20 even if the operator releases his / her hand. That is, the operator can release his / her hand.
As described above, in the operation in which both hands are free, the rear wheel steering device 1 can be lifted with the right hand even if the left hand has the bolt 34 for inserting into the elongated hole. That is, with the bolt 33 temporarily tightened on the first bolt fastening hole 5 (right bolt fastening hole) side, which is the reference hole side, as shown in FIG. The position of the second bolt fastening hole 6 on the left long hole side and the hole position on the vehicle body side can be matched while shifting.

With the left hole aligned, insert the bolt with your left hand. Then, the left and right bolts 33 and 34 are finally tightened with a specified torque. This completes the installation operation.
Here, in the case of a structure in which the rear wheel steering device 1 is fixed to the vehicle body with two bolts, one of the two bolt fastening holes 5 and 6 is a long hole, so that the distance between the hole centers on the vehicle body side is reduced. The tolerance and the distance tolerance between the centers of the holes of the rear wheel steering device 1 are absorbed, and the bolts can be securely inserted into the holes of the vehicle body and the rear wheel steering device 1.

In particular, the first bolt fastening hole 5 on the round hole side has little play (backlash) with the bolt, and serves as a reference for the mounting position of the rear wheel steering device 1. The play between the first bolt fastening hole 5 and the bolt is, for example, less than 0.1 mm.
Further, in the mounted state, it is preferable to set the position of the protruding portion 11 so that the protruding portion 11 is in the center position with respect to the opening 24.
The wheel side end of the tie rod 9 is connected to a wheel support member (axle or the like) (not shown).

(Operation after mounting the rear wheel steering device 1 to the vehicle body)
When the vehicle is traveling, the actuator 4 is driven so that the steering angle of the steering wheel and the rear wheel target turning angle corresponding to the vehicle traveling state are obtained. The rod 2 is relatively displaced in the vehicle width direction by driving the actuator 4 to change the toe angle of the left and right wheels and the axle to control the turning angle of the wheel.

Here, the cylinder member 3 of the rear wheel steering apparatus 1 is attached to the vehicle body by two bolt fastening holes 5 and 6 that are separated from each other in the vehicle width direction.
If there is an excessive input from the wheel through the tie rod 9 due to an accident or the like, the cylinder member 3 may be cracked / damaged. As shown in FIG. 9, the occurrence of the crack / breakage is caused by the round hole side (first bolt) serving as a positioning reference on the cylinder member 3 opposite to the second bolt fastening hole 6 (long hole). It occurs at the fastening hole 5 side).

Here, the reason why the crack / breakage occurs on the side opposite to the second bolt fastening hole 6 (long hole) across the torque transmission portion 10 will be described below.
Between the two bolt fastening holes 5 and 6 that are fastening portions with the vehicle body, there is a torque transmission portion 10 that transmits torque from the actuator 4 to the rod 2. When the road load of the suspension is input as a shaft force of the rod 2 through the tie rod 9, the load is supported by the torque transmission unit 10.

  The external force supported by the torque transmission unit 10 is transmitted to the cylinder member 3 via the actuator 4. A tensile load is applied to one side of the cylinder member 3 across the position of the torque transmission unit 10, and a compression load is supported on the opposite side. In addition, when a crack enters, a crack will usually start from the part to which a tensile load is applied.

  Here, when an excessive input is input to the rod 2 due to a vehicle accident or the like, on the long hole side which is the second bolt fastening hole 6 out of the two bolt fastening holes 5 and 6, Due to the effect of the sliding of the fastening seat surface with the vehicle body, a load is applied to the cylinder member or less than the friction of the fastening seat surface. On the other hand, the round hole that is the first bolt fastening hole 5 (the bolt fastening hole that serves as a reference for the mounting position) is an external force even after slippage occurs on the fastening seat surface of the elongated hole portion that is the second bolt fastening hole 6. Stress concentration occurs while continuing to support. If this stress concentration is excessive, there is a risk that cracks / breakage may occur in the cylinder member 3 on the first bolt fastening hole 5 side which serves as a reference for the mounting position (see FIG. 5). When the crack / breakage occurs, the crack / breakage occurs at the position of the torque transmitting portion 10 and the first bolt fastening hole 5 or the position of the first bolt fastening hole 5. That is, the crack / breakage occurs in the first bolt fastening hole 5 from the position of the torque transmission unit 10.

  At this time, the rod is supported so as to be movable in the axial direction at the cylinder member portion on the second bolt fastening hole 6 side (long hole side) from the position where the crack / breakage occurs. Further, when the crack / breakage occurs, the rear wheel steering device 1 is in a state in which the rear wheel turning device 1 can be rotationally displaced up and down around the bolt on the long hole side which is the second bolt fastening hole 6. At this time, as the projection 11 abuts against the opening, as shown in FIG. 9, the position of the second bolt fastening hole 6 on the elongated hole side and the position of the projection 11 are separated in the rod axis direction 2. In this respect, the rear wheel steering device 1 can be held on the vehicle body. Then, the amount of rotational displacement in the vertical direction of the rear wheel steering device 1 around the bolt 34 inserted into the second bolt fastening hole 6 on the long hole side is suppressed by the protrusion 11. The amount of rotational displacement is determined by vertical play with respect to the opening 24 of the protrusion 11. That is, when the rear wheel steering device 1 is pivotally displaced in the vertical direction around the position of the second bolt fastening hole 6, the protrusion 11 comes into contact with the upper side or the lower side of the opening 24, thereby The rotational displacement is restricted. From this, this play was set small.

Thereby, the deterioration of the control accuracy in turning angle control can be suppressed small. For this reason, for example, even in a situation where the vehicle must be moved urgently after an accident, the vehicle can be moved along a trajectory as expected by the driver.
Further, the play in the rod axis direction S of the protrusion 11 with respect to the opening 24 is larger than the play between the first bolt fastening hole 5 and the bolt 33 which are round holes. For this reason, the protrusion 11 does not receive the above weight. That is, the protrusion 11 can be prevented from being bent or broken, and the above action can be exhibited.

  Here, FIG. 10A shows that the cylinder member 3 is broken when an excessive input is applied, and the fastening portion of the elongated hole portion which is the second bolt fastening hole 6 is slipped to cause the rear wheel rotation. The assembly position of the rudder device 1 is shifted. Since the load on which the fastening seat surface of the rear wheel steering device 1 slides is smaller than the breaking load of the cylinder when an excessive input is input, when the cylinder breaks, the long hole for the bolt, the rear wheel steering device 1 Deviation occurs in the mounting position. At this time, since the corners 11c provided above and below the protrusion 11 hit the opening cross section of the round hole, it is easy to restrict the movement of the rear wheel steering device 1 in the vertical direction. If there is no corner portion 11c that is separated vertically, as shown in FIG. 10 (b), the protrusion 11 having a round cross section rolls along the round hole, and the effect of restricting the movement in the vertical direction is sufficiently obtained. There is no fear.

Moreover, the order of occurrence of the above-mentioned damage is that the fastening part of the rear wheel steering device 1 slips → the load concentrates on the bolt 33 on the round hole side which is the first bolt fastening hole 5 → the round hole side mounting part breaks. Become a flow.
Even if the breakage occurs, even if the fixing position of the rear wheel steering device 1 is shifted by the amount of play between the elongated hole portion that is the second bolt fastening hole 6 and the bolt 34, the protrusion 11 and the opening 24 By increasing the play in between, the protrusion 11 and the opening 24 are in direct contact with each other and a load is applied or a small load is applied, so that the protrusion 11 does not need to be damaged.
Here, the rear wheel steering device 1 constitutes a wheel steering device. The suspension member 20 constitutes a part of the vehicle body.

(Effect of this embodiment)
(1) A first bolt fastening hole 5 for mounting the vehicle body is provided in the cylinder member 3 at a position spaced in the rod axial direction S with respect to the torque transmission portion 10 position from the actuator 4 to the rod 2. The second bolt fastening hole 6, which is a long hole for mounting the vehicle body, is separated in the rod axial direction S in a direction opposite to the position where the first bolt fastening hole 5 is formed with respect to the position of the torque transmission portion 10. The cylinder member 3 is provided at the position. The protrusion 11 that can be inserted into the opening 24 provided in the vehicle body intersects the rod axial direction S from the cylinder member 3 between the position of the torque transmitting portion 10 and the position where the second bolt fastening hole 6 is formed. Project in the direction. The play in the rod axis direction S with respect to the opening 24 of the protrusion 11 is the rod axis between the first bolt fastening hole 5 and the bolt inserted into the first bolt fastening hole 5 in a state assembled to the vehicle body. Greater than play in direction S.

  Thus, when an excessive input to the rod causes a state in which the other bolt fastening hole (round hole) that is not a long hole is not sufficiently fixed, one bolt fastening hole separated in the rod axis direction ( The wheel steering device can be held in the vehicle body by the position of the elongated hole) and the position of the protrusion. As a result, even if there is an excessive input, it is possible to restrict the occurrence of swinging of the wheel turning device to be small. The fact that the occurrence of the oscillation can be reduced leads to minimizing the deterioration of the control accuracy of the steering control.

  For example, when one bolt fastening hole (second bolt fastening hole 6) of the two bolt fastening holes 5 and 6 is a long hole, if a crack or breakage occurs due to excessive input, the first The crack or breakage occurs between the bolt fastening hole 5 or between the first bolt fastening hole 5 and the position of the torque transmitting portion 10. At this time, the rod is in a state of being supported so as to be movable in the axial direction by the cylinder member on the one bolt fastening hole (long hole) side from the crack or broken portion. And the wheel steering apparatus can be made into the state hold | maintained to the vehicle body because the volt | bolt fastened by one bolt fastening hole (long hole) and the projection part 11 contact | abut to an opening part. In other words, the cylinder member portion that supports the rod so as to be movable in the rod axis direction is held in the vehicle body at two locations separated in the rod axis direction (the position of one bolt fastening hole and the position of the protrusion 11). I can do it.

Then, the swing of the wheel steering device around the second bolt fastening hole 6 (vertical swing in the present embodiment) can be restricted to the amount of play between the protrusion 11 and the opening. As a result, even if a crack or breakage occurs on the first bolt fastening hole 5 side due to excessive input, it is possible to reduce the adverse effect on the turning angle control of the left and right wheels by the wheel turning device.
Moreover, it has the following effect at the time of attachment of a wheel steering apparatus.

That is, by providing the protrusion 11 between the two bolt fastening holes 5 and 6 and inserting the protrusion 11 into the opening 24 of the vehicle body, the wheel steering device can be temporarily supported on the vehicle body. As a result, the bolt fastening operation to the bolt fastening holes 5 and 6 is facilitated. That is, it is easy to attach the wheel steering device to the vehicle body.
In addition, by forming the protrusion 11 between the two bolt fastening holes 5 and 6, it is possible to temporarily support the wheel turning device in a state of being turned off. Further, since the actuator 4 is overhanging from the cylinder member 3, it is easy to grip. For this reason, it is easy to adjust the tilt of the wheel turning device by gripping the actuator 4 portion that is eccentric in the rod axis direction S from the protrusion 11 after being temporarily supported.

(2) The second bolt fastening hole 6 and the bolt 34 inserted into the second bolt fastening hole 6 in a state where the play in the rod axial direction S with respect to the opening 24 of the protrusion 11 is assembled to the vehicle body. And larger than the play in the rod axial direction S.
After a crack or break occurs on the first bolt fastening hole 5 side, if there is an input to the rod 2, the cylinder member 3 is moved by the play between the second bolt fastening hole 6 and the bolt 34, which is a long hole. There is a possibility of deviation. By making the play between the protrusion 11 and the opening 24 relatively large, a load is not applied to the protrusion 11 and damage to the protrusion 11 can be avoided.

(3) The protrusion 11 protrudes in the vehicle front-rear direction. The play in the vertical direction with respect to the opening 24 of the protrusion 11 is smaller than the play in the rod axial direction S with respect to the opening 24 of the protrusion 11.
As a result, play in the vertical direction with respect to the opening 24 of the protrusion 11 can be reduced. And when a crack and a fracture | rupture generate | occur | produce on the 1st bolt fastening hole 5 side, the rotation displacement of the wheel steering apparatus centering on the 2nd bolt fastening hole 6 side can be controlled smaller.

(4) The protrusion 11 protrudes in the vehicle front-rear direction. The cross-sectional shape of the lower surface 11a of the protrusion 11 is an arc shape that protrudes downward along the rod axial direction S.
When assembling the wheel steering device, if the protrusion 11 is inserted into the opening 24 of the vehicle body and temporarily supported, the lower surface 11a of the protrusion 11 comes into contact with the opening 24 and transmits the load. By making the portion in contact with the opening 24 a convex on the lower side along the rod axis direction S (vehicle width direction), the tilting of the wheel steering device centering on the lower surface of the protrusion 11 becomes smooth. This leads to easy hole alignment on the first bolt fastening hole 5 side.

(5) The protrusion 11 protrudes in the vehicle front-rear direction. The protrusion 11 includes two corners 11c formed on both the left and right sides and spaced apart from each other.
After a crack or breakage occurs on the first bolt fastening hole 5 side, the wheel turning angle is pivotally displaced around the second bolt fastening hole 6 side, which is a long hole, and the protrusion 11 opens. When abutting against the opening 24, the corner 11 c of the protrusion 11 is likely to abut against the opening 24. When the corner portion 11c abuts, the vertical displacement can be more effectively regulated.

(6) The longitudinal section of the protrusion 11 becomes smaller as it approaches the tip.
Since the cross section gradually decreases toward the tip, the projection 11 can be easily inserted into the opening 24 of the vehicle body.
(7) The protrusion 11 protrudes in the vehicle front-rear direction. The position of the protrusion 11 is set higher than the center of gravity of the actuator 4.
The protrusion 11 is temporarily supported at a position higher than the center of gravity of the actuator 4 which is a heavy object. For this reason, the stability of the temporary support by the projection part 11 improves.

(8) A wheel turning device capable of turning the left and right wheels by transmitting torque from the actuator 4 to the rod 2 is attached to the vehicle body. At this time, the projection 11 is inserted into an opening 24 provided in the vehicle body so that the wheel steering device is temporarily supported by the vehicle body, and then the two bolt fastening holes 5 and 6 are bolted to the vehicle body. .
This facilitates the assembly work of the wheel steering device to the vehicle body.

(Modification)
(1) A low-strength fuse portion is preferably formed at the position of the cylinder member 3 between the first bolt fastening hole 5 and the position of the torque transmission portion 10.
For example, as shown in FIG. 11, the meat of the cylinder member 3 positioned between the brackets 7 and 8 forming the first bolt fastening holes 5 and the mounting portion of the actuator 4 with respect to the cylinder member 3 is consciously considered. By cutting, the part is made a fuse part 31 with lower strength than the peripheral part.

In this case, when an excessive input is input due to an accident or the like, the place where the crack occurs can be controlled in advance. By generating cracks / breakage between the brackets 7 and 8 forming the first bolt fastening hole 5 and the position of the torque transmission part 10, the elongated hole part that is the second bolt fastening hole 6 is reliably It is possible to make a crack so that the mode is supported by two points of the protrusion 11.
Further, when the bearing supporting the rod 2 rubs on the first bolt fastening hole 5 side with respect to the crack position, the guide function by the bearing supporting the rod 2 acts to provide three-point support. Can do.

(2) In the said embodiment, it illustrated by the case where the direction of each bolt fastening hole and the direction of the projection part 11 face the same direction. Even if the direction of each bolt fastening hole and the direction of the protrusion 11 do not face the same direction, the present embodiment can be applied.
For example, the structure as shown in FIGS. 12 and 13 can be applied as a structure for attaching the rear wheel steering device 1 to the suspension member 20.

This structure is an example in which the protrusion 11 protrudes in the vehicle front-rear direction, but the bolt fastening holes 5 and 6 face in the vertical direction. That is, by making the brackets 7 and 8 forming the bolt fastening holes 5 and 6 into L-shaped brackets 7 and 8, the bolt fastening holes are directed in the vertical direction.
Also in this case, the protrusion 11 is inserted into the opening 24 of the vehicle body and temporarily supported. In this state, the wheel steering device is tilted up and down with the protrusion 11 as the center, and the first bolt fastening hole 5 which is the round hole side is aligned and temporarily tightened. Then, the long hole side which is the 2nd bolt fastening hole 6 is hole-matched, and bolt fastening is performed.

Here, it is originally desired to have a structure in which the bolt is inserted in the same direction as the direction of the protruding portion 11, but the positional relationship between the cylinder member 3 and the suspension member 20 may not be possible for the following reason.
In other words, if the cylinder is arranged at a position close to the corner portion 11c of the suspension member 20, there is no space for inserting a bolt below the cylinder. Further, there is no space for attaching the back nut on the suspension member 20 side. In addition, there is a case where it is impossible to insert a bolt in the same direction as the projection 11 on the upper side of the cylinder member 3 because there is no gap with the vehicle body, which is a completely different requirement. In such a case, it is necessary to fasten the bolt to the lower surface as described above.

(3) The brackets 7 and 8 that form the bolt fastening holes 5 and 6 may be formed integrally with the cylinder member 3 or may be fixed to the cylinder member 3 by bolt fastening later.
(4) In the above embodiment, the case where the protrusion 11 protrudes in the vehicle front-rear direction is illustrated, but the present invention is not limited to this. What is necessary is just to set the protrusion direction of the projection part 11 according to the assembly | attachment structure of a wheel steering apparatus. For example, the protrusion 11 may protrude downward.

(5) Moreover, in the said embodiment, the rear-wheel steering apparatus 1 used as the wheel steering apparatus was illustrated. However, it is not limited to this. Any wheel steering device with the actuator 4 fixed can be applied even to a front wheel steering device.
(6) Moreover, the suspension member was illustrated as a vehicle body. The vehicle body part to which the wheel steering device is assembled is not limited to the suspension member. The present invention can be applied even when the wheel steering device is assembled to the vehicle body frame itself.

1 Rear wheel steering device (wheel steering device)
2 Rod 3 Cylinder member 4 Actuator 4A Electric motor 4B Gear box 5 First bolt fastening hole 6 Second bolt fastening hole 7, 8 Bracket 10 Torque transmitting portion 11 Projection portion 11a Lower surface 11b Upper surface 11c Corner portion 20 Suspension member 23 Rear Side cross member 24 Opening 31 Fuse part 33, 34 Bolt S Rod axial direction

Claims (10)

A rod that is movable in the axial direction to steer the left and right wheels, a cylinder member that supports the rod so as to be movable in the axial direction, and is fixed to the cylinder member and is attached to the rod in the axial direction. An actuator capable of transmitting the torque to be moved;
A first bolt fastening hole for mounting a vehicle body provided in the cylinder member at a position spaced apart in the rod axial direction with respect to the torque transmission portion position from the actuator to the rod;
A second hole comprising a long hole for mounting a vehicle body provided in the cylinder member at a position opposite to the position where the first bolt fastening hole is formed with respect to the position of the torque transmitting portion and spaced apart in the rod axis direction. Bolt fastening holes,
A protrusion protruding from the cylinder member in a direction crossing the rod axis direction between the torque transmitting portion position and the second bolt fastening hole forming position, and capable of being inserted into an opening provided in the vehicle body;
With
The play in the rod axis direction with respect to the opening of the projection is caused by the play in the rod axis direction between the first bolt fastening hole and the bolt inserted into the first bolt fastening hole in a state assembled to the vehicle body. A wheel steering device characterized by being large.   The play in the rod axis direction with respect to the opening of the projection is less than the play in the rod axis direction between the second bolt fastening hole and the bolt inserted into the second bolt fastening hole in a state assembled to the vehicle body. The wheel turning device according to claim 1, wherein the wheel turning device is set to be larger. The protrusion protrudes in the vehicle front-rear direction,
The wheel turning device according to claim 1 or 2, wherein play in the vertical direction with respect to the opening of the protrusion is smaller than play in the rod axis direction with respect to the opening of the protrusion. The protrusion protrudes in the vehicle front-rear direction,
The wheel steering according to any one of claims 1 to 3, wherein a cross-sectional shape of a lower surface of the protrusion is an arc shape convex downward along the rod axis direction. apparatus. The protrusion protrudes in the vehicle front-rear direction,
The wheel steering apparatus according to any one of claims 1 to 4, wherein the protrusion includes two corners formed on the left and right sides of the protrusion so as to be spaced apart from each other.   The wheel steering device according to any one of claims 1 to 5, wherein a longitudinal section of the projection portion becomes smaller as the tip portion is approached.   The wheel rolling according to any one of claims 1 to 6, wherein a fuse portion having low strength is formed at a cylinder member position between the first bolt fastening hole and the torque transmission portion position. Rudder device. The protrusion protrudes in the vehicle front-rear direction,
The wheel steering apparatus according to any one of claims 1 to 7, wherein a position of the protrusion is higher than a center of gravity of the actuator. A wheel steering device mounting structure to a vehicle body capable of steering left and right wheels by transmitting torque from an actuator to a rod,
The wheel steering device is attached to the vehicle body by two bolt fastening holes for mounting the vehicle body and spaced apart from each other in the rod axis direction across the position of the torque transmission portion from the actuator to the rod, and the two bolts are fastened. Make one of the holes a long hole,
A projection formed between the bolt fastening hole of the elongated hole and the position of the torque transmission portion and projecting in a direction crossing the rod axis direction is inserted into an opening provided in the vehicle body, and the projection of the projection The play in the rod axis direction with respect to the opening is set to a value larger than the play in the rod axis direction between the bolt fastening hole that is not the long hole and the bolt inserted into the bolt fastening hole in a state where the play is assembled to the vehicle body. A structure for attaching a wheel steering device to a vehicle body. An attachment method for attaching a wheel steering device capable of steering left and right wheels by transmitting torque from an actuator to a rod,
The wheel steering device is provided with two bolt fastening holes for mounting the vehicle body separated from each other in the rod axial direction across the torque transmission position from the actuator to the rod, and one of the two bolt fastening holes. And a protrusion projecting in a direction crossing the rod axis direction is provided between the bolt fastening hole of the elongated hole and the torque transmission portion position,
A wheel steering characterized in that the projection is inserted into an opening provided in the vehicle body so that the wheel steering device is temporarily supported by the vehicle body, and then the two bolt fastening holes are bolted to the vehicle body. How to attach the device to the car body.

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