JP2006281826A - Vehicular electric power steering device supporting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the length and the weight of a steering shaft, and to enhance the assemblability by improving a vehicular electric power steering device supporting structure. <P>SOLUTION: A steering shaft 38 is supported by a vehicle body frame via a radial bearing 90a (not shown) and ball bearings 113, 138 as a plurality of bearings. At least one of the bearings 90a, 113, 138, i.e., the ball bearing 113 is of the automatic alignment type. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a structure for supporting an electric power steering device of a vehicle.

As a conventional structure for supporting an electric power steering device of a vehicle, a structure in which the upper and lower portions of the electric power steering device are supported by bearings is known (for example, see Patent Document 1).
JP 2004-231011 A

Patent Document 1 will be described below.
As shown in FIG. 4 of Patent Document 1, the steering shaft 50 is formed by connecting an upper shaft 50a and a lower shaft 50b with a universal joint 51, and the upper shaft 50a is passed to the left and right upper pipes 18. The lower shaft 50b is rotatably attached to the lower bracket 54 passed to the left and right front suspension support portions 23b of the front cross pipe 23 via the gear case 55. It is done.
The universal joint 51 is disposed between the shaft support member 52 and the gear case 55.

  Since the universal joint 51 includes a pair of yokes, the entire length of the steering shaft 50 is increased. When the electric power steering device and the steering shaft 50 are assembled to the vehicle body frame, first, the lower shaft 50b is temporarily assembled together with the gear case 55 to the lower bracket 54, and then the universal joint 51 connected to the lower shaft 50b. Is connected to the upper shaft 50a, but the upper part of the universal joint 51 is bent. Therefore, the upper shaft 50a must be connected while pressing the upper part of the universal joint 51, and the assemblability is poor. . Furthermore, using the universal joint 51 makes it heavier than using a simple shaft.

  It is an object of the present invention to improve the electric power steering device support structure of a vehicle, thereby shortening the steering shaft and reducing the weight, and further improving the assemblability.

  According to a first aspect of the present invention, there is provided a vehicle including an electric power steering apparatus in which a steering shaft is rotatably attached to a vehicle body frame, a handle is attached to an upper portion of the steering shaft, and an actuator unit is provided in the middle of the steering shaft. Is supported on the body frame via a plurality of bearings, and at least one of these bearings is of an automatic alignment type.

  When connecting the steering shaft and the actuator unit, the relative inclination of the axes of the steering shaft and the actuator unit is absorbed by the self-aligning bearing, so the steering shaft and the actuator unit can be assembled without difficulty. Yes, there is no need for a conventional universal joint.

The invention according to claim 2 is characterized in that a pair of bearings is arranged above and below the vicinity of the actuator unit.
The upper and lower portions in the vicinity of the actuator unit are supported by bearings to ensure the support of the actuator unit.

The invention according to claim 3 is characterized in that the self-aligning bearing is disposed above the actuator unit.
When the axis of the actuator unit is connected to the steering shaft and the steering shaft is supported by the self-aligning bearing, the self-aligning bearing absorbs the tilt of the steering shaft.

The invention according to claim 4 is characterized in that the bearing is held by a holder, and this holder is detachably attached to the body frame side by a bolt.
Since the assembly of the bearing and the holder is fastened to the vehicle body frame side by bolts or attached by loosening the bolt from the vehicle body frame side, the assemblability is improved.

The invention according to claim 5 is characterized in that the steering shaft and the actuator unit are coupled by serration.
In serration, it is possible to finely set the tooth pitch, and it is easy to adjust the phase of the coupling between the steering shaft side and the actuator unit side.

The invention according to claim 6 is characterized in that the self-aligning bearing is disposed at the lower end of the steering shaft.
When the lower end of the steering shaft is supported by the self-aligning bearing, the self-aligning bearing absorbs the tilt of the steering shaft.

  In the invention according to claim 1, since at least one of the bearings is self-aligning, the self-aligning bearing can absorb the tilt when the steering shaft is assembled, and a conventional universal joint This eliminates the need to reduce the cost and improve the assembly of the steering shaft and the actuator unit. In addition, since the universal joint is not required, the steering shaft can be shortened, the weight of the steering shaft can be reduced, and the cost can be reduced.

  In the invention according to claim 2, since the pair of bearings is disposed above and below the vicinity of the actuator unit, the actuator unit can be supported so as to be sandwiched between the upper and lower portions. Support can be performed more reliably.

  In the invention according to claim 3, since the self-aligning bearing is disposed above the actuator unit, for example, when the upper and lower sides of the actuator unit are connected by a steering shaft and supported by a ball bearing, the actuator unit After assembling to the lower bearing, when assembling to the upper bearing of the actuator unit, even if the axis of the actuator unit or the steering shaft is tilted, the assembly can be carried out without difficulty and the assemblability is improved. be able to.

  In the invention according to claim 4, since the bearing is held by the holder, and this holder is detachably attached to the body frame side with the bolt, it is attached to the body frame side by the assembly of the bearing and the holder, or is detached from the body frame side. It is possible to improve the assembling property.

  In the invention according to claim 5, since the steering shaft and the actuator unit are coupled by serration, the phase of coupling between the steering shaft and the actuator unit is finely adjusted by serration and the number of teeth is increased. be able to.

  In the invention according to claim 6, since the self-aligning bearing is disposed at the lower end of the steering shaft, the tilting of the steering shaft can be absorbed by the self-aligning bearing, and high accuracy is not required for the body frame. In addition, the steering shaft can be easily assembled.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a rough terrain vehicle equipped with an electric power steering apparatus according to the present invention. The rough terrain vehicle 10 has a power unit 14 including an engine 12 and a transmission 13 mounted at the center of a body frame 11. A front end reduction device 17 is connected to the front portion of the transmission 13 via a front propeller shaft 16, and the front end reduction device 17 is connected to left and right front wheels 18 and 18 via a drive shaft (not shown). A rear final reduction gear 22 is connected to the rear portion of the machine 13 via a rear propeller shaft 21, and left and right rear wheels 23, 23 are connected to the rear final reduction gear 22 via a drive shaft (not shown). This is a four-wheel drive vehicle equipped with an electric power steering device 24 that reduces the steering force for steering 18.

  The vehicle body frame 11 has a pair of left and right upper main frames 31 and 32 (only the reference numeral 31 on the near side is shown) extending in the front-rear direction and a reverse U-shape in front view connected to the front ends of these upper main frames 31 and 32, respectively. Front frame 33, a pair of left and right lower main frames 34, 36 (only the reference numeral 34 on the front side is shown) connected to the lower end of the front frame 33 and the middle part of the upper main frames 31, 32, and the upper end thereof. In order to rotatably support the upper portion of the steering shaft 38 to which the handle 37 is attached, a pair of left and right front-shaped front frames 41, 42 connected to the upper end of the front frame 33 and the upper main frames 31, 32 ( Only the front side 41 is shown.) And the front ends of the upper main frames 31 and 32. A pair of left and right inclined frames 43 and 44 (only the reference numeral 43 on the near side is shown) connected to the lower main frames 34 and 36 in the rearward downward direction, and an intermediate portion of these inclined frames 43 and 44 and the front frame 33 are respectively passed. And a pair of left and right sub-inclined frames 46 and 47 (only the reference numeral 46 on the front side is shown) for supporting the lower portion of the electric power steering device 24.

  Here, 55 is a front carrier, 56 is a front fender that covers the upper and rear of the front wheel 18, 57 is a fuel tank, 58 is a seat, 61 is a rear carrier, and 62 is a carburetor connected to the rear side of the cylinder head 63 of the engine 12. 66, an air cleaner connected to the carburetor 62 via a connecting tube 67, 68 an exhaust pipe extending from the front of the cylinder head 63 to the rear of the vehicle, 69 a silencer connected to the rear end of the exhaust pipe 68, and 71 a lower Swing arms 72 and 72 (only reference numeral 72 on the front side) for swingably supporting the rear wheels 23 and 23 with respect to the main frames 34 and 36 are provided on the swing arm 71 and the upper main frames 31 and 32 side. A pair of left and right rear cushion units 73, which are handed over and mounted, are arranged on the sides of the power unit 14. Di side covers, a rear fender for covering the front and above the rear wheel 23 is 74, 75 is step floor.

  FIG. 2 is a side view of the main part of the rough terrain vehicle according to the present invention (the arrow (FRONT in the figure represents the front of the vehicle; the same applies hereinafter)), and the electric power steering device 24 is used to steer the front wheels. The steering device 81 includes an actuator unit 77 provided in the middle of the steering shaft 38 constituting the steering device 81, and a control unit (not shown). The actuator unit 77 detects torque for detecting steering torque in the actuator case 78. A sensor unit (not shown) and a power assist unit 83 that generates power for assisting the steering force are provided. The control unit controls the power assist unit 83 based on the steering torque detected by the torque sensor unit.

  The steering device 81 includes a handle 37 (see FIG. 1), an input shaft 85 that supports the handle 37, an output shaft 86 connected to the input shaft 85 via a torque sensor unit, and a lower end portion of the output shaft 86. A steering arm 87 attached to the steering arm 87, a pair of left and right ball joints 88, 88 attached to the steering arm 87 (only reference numeral 88 is shown), one end connected to each of these ball joints 88, 88 and the other. It consists of a pair of left and right tie rods (not shown) that connect the end to a knuckle (not shown) on the front wheel 18 (see FIG. 1) side. The input shaft 85 and the output shaft 86 are members constituting the steering shaft 38. It is.

The input shaft 85 is a member that is supported at two locations. One support is performed by the upper bearing portion 90, and the other support is performed by the intermediate bearing portion 91 located below the upper bearing portion 90.
The upper bearing portion 90 is attached to the support bracket 92 passed to the left and right front upper frames 41 and 42 (only the reference numeral 41 on the front side) with two bolts 95 and 95 with bolts 98 and 98. A radial bearing (sliding bearing) 90a that rotatably supports the input shaft 85 and a pair of bearing holding members 90b and 90c that hold the radial bearing 90a therebetween.

  The intermediate bearing 91 is supported by an intermediate bearing support bracket (not shown; details will be described later) attached to the sub-upper frames 89 and 89 (only the reference numeral 89 is shown on the front side).

The sub-upper frames 89 and 89 are members respectively passed to the front upper frames 41 and 42 and the upper main frames 31 and 32 (only the reference numeral 31 on the front side is shown).
The output shaft 86 is supported by the lower bearing portion 102 via the lower bearing support bracket 101 on the left and right sub-inclined frames 46 and 47 (only the reference numeral 46 is shown on the front side).

The torque sensor unit is provided with a torsion bar (not shown) between the input shaft 85 side and the output shaft 86 side.
When the input shaft 85 is rotated by operating the handle 37 (see FIG. 1), a relative rotation angle is generated between the input shaft 85 and the output shaft 86, and the torsion bar is twisted. The steering torque is obtained by detecting this twist amount and converting it into torque.

  The power assist unit 83 includes an electric motor 96, a clutch (not shown) and a speed reducer (not shown, comprising a worm gear and a worm wheel) interposed between the output shaft and the output shaft 86 of the electric motor 96. It is a part composed of

  The electric motor 96 is attached to the motor brackets 97 and 97 (only the reference numeral 97 on the front side is provided) provided on the sub inclined frames 46 and 47 on the front end side (output shaft 86 side).

  The control unit controls the power assist unit 83 based on the steering torque detected by the torque sensor unit, the steering angle detected by the steering angle sensor, the vehicle speed of the rough terrain vehicle 10 (see FIG. 1), and the like.

  Since the front final reduction gear 17 is located below the actuator unit 77, the entire length of the steering shaft 38 of the electric power steering device 24 is shortened and the electric power steering device 24 is arranged in a small space in the present invention.

  FIG. 3 is a plan view of an essential part of the rough terrain vehicle according to the present invention, in which the electric motor 96 provided in the actuator unit 77 is arranged to extend rearward of the vehicle, and the forced air cooling fan 101 is arranged rearward of the electric motor 96. It also shows that the engine 12 and the exhaust pipe 68 are disposed in front of each other. Reference numeral 103 denotes a cross member attached to the upper portion of the front frame 33 so as to extend in the vehicle width direction in order to support the upper ends of the left and right front cushion units for the front wheels 18 and 18 (see FIG. 1).

  Since the electric motor 96 is completely shielded between the engine 12 and the exhaust pipe 68 by the forced air cooling fan 101, the electric motor 96 is arranged so as to extend rearward of the vehicle and the electric motor 96, the engine 12, and the exhaust pipe 68. There is no concern that direct radiant heat from the engine 12 and the exhaust pipe 68 will hit the electric motor 96.

  FIG. 4 is a cross-sectional view (partial side view) showing the electric power steering device support structure according to the present invention. The input shaft 85 is supported by the lower shaft 104 projecting from the actuator 77 and the intermediate bearing portion 91. And an upper shaft 105 connected to the lower shaft 104. The upper shaft 105 includes an upper pipe 107 that supports the handle, and a lower end connecting member 108 attached to the lower end portion of the upper pipe 107.

  The intermediate bearing portion 91 includes an upper bearing holder 112 that is detachably attached to the intermediate bearing support bracket 111 with bolts (not shown) and an automatic adjustment that is attached to the upper bearing holder 112 to rotatably support the lower end connecting member 108. A core-type ball bearing 113 and seal members 114 and 116 for protecting the ball bearing 113 from dust and the like are included. Reference numeral 118 denotes a retaining ring for preventing the ball bearing 113 from coming off from the upper bearing holder 112.

  The lower end connecting member 108 is integrally provided with a rear projecting portion 121 projecting rearward of the vehicle at the upper portion, and a male screw 123 for screw coupling to the nut member 122 at the lower portion and a male serration 124 provided on the outer peripheral surface of the lower shaft 104. This is a member in which a female serration 126 to be coupled to and a slit 127 provided at the tip end portion are formed.

  The rear protruding portion 121 is a portion that hits a stopper (not shown) provided on the upper bearing holder 112 when the lower end connecting member 108 is rotated via the handle, and restricts the turning angle of the handle to a predetermined angle range. It is.

The nut member 122 is formed by pressing the tip 122 a against the ball bearing 113 by screwing the female screw 128 into the male screw 123.
The slit 127 is formed so that the width of the slit 127 becomes narrow when the outer peripheral surface of the lower end connecting member 108 is tightened with the tightening member 131 in a state where the lower shaft 104 and the lower end connecting member 108 are coupled by serration. This is the part where the tightening force works effectively. Reference numerals 133 and 134 denote fastening bolts and nuts provided on the fastening member 131.

  The lower bearing portion 102 includes a lower bearing holder 136 attached to the central portion of the lower bearing support bracket 101 supported by the sub-inclined frames 46 and 47, and a collar 137 on the lower bearing holder 136 for rotatably supporting the output shaft 86. And the seal members 141 and 142 for protecting the ball bearing 138 from dust and the like. Reference numeral 144 denotes a retaining ring for preventing the ball bearing 138 and the collar 137 from coming off from the lower bearing holder 136.

  The lower bearing holder 136 is formed with a lower protruding portion 136a that protrudes downward substantially along the output shaft 86 at the front portion, and protrudes downward when the output shaft 86 is rotated by a predetermined angle by cutting the handle. A side protrusion (not shown) provided on the steering arm 87 hits the portion 136a, and the rotational angle range of the output shaft 86 is restricted. That is, the downward projecting portion 136 a serves as a stopper that regulates the rotational angle range of the output shaft 86.

  The steering arm 87 is a member attached to the end of the output shaft 86 with a nut 146, and the serration 147 formed on the inner peripheral surface of the steering arm 87 is coupled to the male serration 148 formed on the lower end of the output shaft 86. Then, a ball joint (not shown) is attached to a nut portion 151 provided integrally with the steering arm 87, and this ball joint is connected to the front wheel side by a tie rod (not shown). Reference numeral 153 denotes a female screw into which the bolt is screwed when the electric motor is attached to the motor bracket 97 with a bolt (not shown).

  FIG. 5 is a cross-sectional view of the upper bearing portion that supports the steering shaft according to the present invention. The upper bearing portion 90 includes a radial bearing 90a fitted to the input shaft 85, and bearing holding members 90b and 90c. The radial bearing 90a is a member having an outer peripheral surface 90d formed into a convex spherical shape, and the inner peripheral surfaces 90e and 90f having the concave spherical shape of the bearing holding members 90b and 90c are slidable on the outer peripheral surface 90d. It is made to fit in. As described above, the upper bearing portion 90 is of a self-aligning type capable of absorbing the inclination of the input shaft 86 even when the input shaft 85 is attached to be inclined with respect to a predetermined attachment state.

  Thus, by using the self-aligning radial bearing 90a, it is possible to assemble the steering shaft 38 (see FIG. 1) without obtaining high dimensional accuracy in the vehicle body frame 11 (see FIG. 1). .

  FIG. 6 is a perspective view showing an intermediate bearing portion of the steering shaft according to the present invention. The intermediate bearing support bracket 111 is attached to the left and right sub-upper frames 89, 89, and the upper portion of the intermediate bearing portion 91 is attached to the intermediate bearing support bracket 111. It shows that the bearing holder 112 is attached with a plurality of bolts 161.

  Since the upper bearing holder 112 accommodates the ball bearing 113 (see FIG. 4), the assembly of the ball bearing 113 and the upper bearing holder 112 is attached to the intermediate bearing support bracket 111 or the intermediate bearing support bracket 111 is mounted. Can be easily removed, and the assemblability can be improved.

FIG. 7 is a view taken in the direction of arrow 7 in FIG. 6 and shows the lower end connecting member 108 and the upper bearing holder 112.
The upper bearing holder 112 includes a cylindrical portion 163 provided in the central portion and plate portions 164 and 165 integrally extending from both sides of the cylindrical portion 163, and a plurality of mounting holes 166 are formed in the plate portions 164 and 165. The bolt 161 is passed through each mounting hole 166 and screwed into a nut (not shown) provided on the lower surface of the intermediate bearing support bracket 111 (see FIG. 6), and the upper bearing holder 112 is attached to the intermediate bearing support bracket 111. Reference numerals 171 and 172 denote stoppers that restrict the rotational angle range of the input shaft 85 by applying the rearward projecting portion 121 of the lower end connecting member 108.

FIG. 8 is a cross-sectional view (partial side view) showing another embodiment of the electric power steering device support structure according to the present invention. The same components as those in the embodiment shown in FIG. Omitted.
The intermediate bearing portion 181 that supports the input shaft 85 includes an upper bearing holder 112, a ball bearing 182 attached to the upper bearing holder 112 to rotatably support the lower end connecting member 108, and the ball bearing 182 from dust or the like. It consists of seal members 114 and 116 for protection.

  The lower bearing portion 185 that supports the output shaft 86 includes a lower bearing holder 136, and a self-aligning ball bearing 186 that is attached to the lower bearing holder 136 via a collar 137 to rotatably support the output shaft 86. The ball bearing 186 includes seal members 141 and 142 for protecting the ball bearing 186 from dust and the like.

  Since the ball bearing 186 that supports the lower end of the steering shaft 38 is of the self-aligning type, the steering shaft 38 even when the dimensional accuracy of the body frame 11 (see FIG. 1), specifically, the sub-inclined frames 46 and 47 is low. Can be assembled without hindrance. Furthermore, during the assembly of the steering shaft 38, the output shaft 86 can be tilted from the normal position by the self-aligning ball bearing 186, so that the assembly of other members can be prevented. Assembling workability can be improved.

  As shown in FIGS. 1 and 4, the present invention firstly attaches a steering shaft 38 to the vehicle body frame 11 in a rotatable manner, and attaches a handle 37 to the upper portion of the steering shaft 38. In the rough terrain vehicle 10 provided with the electric power steering apparatus 24 provided with the actuator unit 77 on the steering shaft 38, the vehicle body frame 11 is provided with a radial bearing 90a (see FIG. 2) as a plurality of bearings, and ball bearings 113, 138. And at least one of these bearings 90a, 113, 138, that is, the ball bearing 113 is of an automatic alignment type.

  Since at least one of the bearings 90a, 113, 138 is an automatic alignment type, the automatic alignment type bearing 113 can absorb the tilt when the steering shaft 38 is assembled, and a conventional universal joint is unnecessary. Thus, the cost can be reduced and the assembly of the steering shaft 38 and the actuator unit 77 can be improved. In addition, since the conventional universal joint is eliminated, the steering shaft 38 can be shortened and the steering shaft 38 can be reduced in weight.

Second, the present invention is characterized in that a pair of bearings is arranged above and below the vicinity of the actuator unit 77.
Since the pair of bearings 113 and 138 of the bearings 90a, 113, and 138 are disposed above and below the vicinity of the actuator unit 77, the actuator unit 77 can be supported so as to be sandwiched between the upper and lower portions. 113 and 138 can support the actuator unit 77 more reliably.

Third, the present invention is characterized in that the self-aligning bearing 113 is disposed above the actuator unit 77.
Since the self-aligning bearing 113 is disposed above the actuator unit 77, for example, when the upper and lower sides of the actuator unit 77 are connected by the steering shaft 38 and supported by the ball bear rigs 113 and 138, the actuator unit 77 is After assembling to the lower bearing 138, when assembling to the upper bearing 113 of the actuator unit 77, the lower shaft 104 which is the axis of the actuator unit 77 and the lower end connecting member 108 of the steering shaft 38 are assembled even if tilted. Can be performed without difficulty, and the assemblability can be improved.

  Fourthly, according to the present invention, as shown in FIGS. 4 and 6, the ball bearing 113 is held by the upper bearing holder 112, and a plurality of the upper bearing holders 112 are attached to the vehicle body frame 11 side, that is, the intermediate bearing support bracket 111. The bolt 161 is detachably attached.

  Since the ball bearing 113 is held by the upper bearing holder 112, and the upper bearing holder 112 is detachably attached to the body frame 11 side by the bolt 161, the assembly of the ball bearing 161 and the upper bearing holder 112 is attached to the body frame 11 side. It can be attached to or removed from the body frame 11 side, and the assembling property can be improved.

Fifth, the present invention is characterized in that the end connecting member 108 of the steering shaft 38 and the lower shaft 104 on the actuator unit 77 side are coupled by serration.
Since the end connecting member 108 and the lower shaft 104 are coupled by serration, the phase of the coupling between the end connecting member 108 and the lower shaft 104 is finely adjusted by serration to finely increase the number of teeth. be able to.

  Sixth, the present invention is characterized in that a self-aligning ball bearing 186 is disposed at the lower end portion of the steering shaft 38, specifically, the output shaft 86, as shown in FIG.

  Since the self-aligning ball bearing 186 is disposed at the lower end of the steering shaft 38, the tilting of the steering shaft 38 can be absorbed by the self-aligning ball bearing 186, and the body frame 11 is required to have high accuracy. In addition, the steering shaft 38 can be easily assembled.

  In the present embodiment, as shown in FIG. 4, the ball bearing 113 located above the actuator unit 77 is the self-aligning type. However, the present invention is not limited thereto, and the ball bearing 113 above the actuator unit 77 Both the ball bearing 138 below the actuator unit 77 may be self-aligning.

  The electric power steering device support structure of the present invention is suitable for a four-wheeled vehicle.

It is a side view of a rough terrain vehicle provided with an electric power steering device according to the present invention. It is a principal part side view of the rough terrain vehicle which concerns on this invention. It is a principal part top view of the rough terrain vehicle which concerns on this invention. It is sectional drawing which shows the electric power steering apparatus support structure which concerns on this invention. It is sectional drawing of the upper bearing part which supports the steering shaft which concerns on this invention. It is a perspective view which shows the intermediate bearing part of the steering shaft which concerns on this invention. FIG. 7 is a view taken in the direction of arrow 7 in FIG. 6. It is sectional drawing which shows another embodiment of the electric power steering apparatus support structure which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle (Rough terrain vehicle), 11 ... Body frame, 24 ... Electric power steering device, 37 ... Handle, 38 ... Steering shaft, 77 ... Actuator unit, 90a, 113, 138, 182, 186 ... Bearing, 90b, 90c, 112, 136 ... holder, 113, 186 ... self-aligning bearing, 124, 126, 147, 148 ... serration, 161 ... bolt.

Claims (6)

In a vehicle equipped with an electric power steering device in which a steering shaft is rotatably attached to a vehicle body frame, a handle is attached to an upper portion of the steering shaft, and an actuator unit is provided in the middle of the steering shaft.
A steering shaft provided in the electric power steering device is supported by the vehicle body frame via a plurality of bearings, and at least one of these bearings is of an automatic alignment type. Construction.   2. The electric power steering apparatus supporting structure for a vehicle according to claim 1, wherein a pair of the bearings is disposed above and below the vicinity of the actuator unit.   2. The electric power steering apparatus supporting structure for a vehicle according to claim 1, wherein the self-aligning bearing is disposed above the actuator unit.   4. The electric power steering device support structure for a vehicle according to claim 1, wherein the bearing is held by a holder, and the holder is detachably attached to the body frame side with a bolt.   The electric power steering device support structure for a vehicle according to any one of claims 1 to 4, wherein the steering shaft and the actuator unit are coupled by serration.   2. The electric power steering device support structure for a vehicle according to claim 1, wherein the self-aligning bearing is disposed at a lower end of the steering shaft.

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