JP2000238647A - Electric steering column device - Google Patents

Abstract

(57) [Problem] To provide an electric steering column device capable of easily and accurately determining a tilt position and a telescopic position of a steering wheel. A tilt position of an upper column member is electrically adjusted by an electric tilt actuator. The electric tilt actuator 7 has a main body unit including an electric motor 71 provided with a gear box 70, a telescopic rod device 72 driven by the electric motor 71, and a position detection device 73 for detecting a rotation amount of the electric motor 71. Prepare.
Actuator rod 7 extending from telescopic rod device 72
2a expands and contracts according to the rotation of the electric motor 71, and the amount of expansion and contraction at this time is
Is digitally detected as the number of rotations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric steering column device capable of rotatably holding a steering shaft and electrically adjusting a position of a steering wheel.

[0002]

2. Description of the Related Art A conventional electric steering column apparatus is disclosed in, for example, Japanese Patent No. 2647476. In this device, a tilt joint and a telescopic joint are provided to set the steering wheel to a desired axial position and a desired vertical position, and the tilt position and the telescopic position of the steering wheel are adjusted by an actuator including an electric motor and a screw mechanism. It adopts a configuration that can be used. Then, a switch mechanism is provided which enables the electric motor to operate only when a predetermined action or more in the predetermined direction of the steering wheel is performed, thereby electrically adjusting the tilt position and the telescopic position of the steering wheel.

[0003]

However, the electric steering column device described above cannot detect the tilt position and the telescopic position of the steering wheel. Detecting the position of the steering wheel is important in fine adjustment and control of the position of the steering wheel. When detecting the position of the steering wheel, it is common to use a rotary encoder or linear encoder that uses a brush or a variable resistor, etc. There is no fear.

Further, in the above-mentioned electric steering column device, since the actuator for tilt and the actuator for telescopic are separate components, the types of steering system components increase. This not only reduces the mass productivity of the actuators, but also necessitates selecting two types of actuators when assembling the steering device, which is an obstacle in reducing the manufacturing cost and the number of assembly steps. Had become.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is an electric motor capable of easily and accurately detecting a tilt position and a telescopic position of a steering wheel and realizing cost reduction by sharing components. It is an object of the present invention to provide a steering column device.

[0006]

In order to solve the above problems, according to the first aspect of the present invention, there is provided a steering shaft having a steering wheel mounted on a rear end thereof, a steering column rotatably supporting the steering shaft, An electric actuator that drives the steering column to adjust the position of the steering shaft;
An electric steering column device comprising: a position detecting means for detecting a position of the steering shaft in a non-contact manner.

In this electric steering column device,
Since the position detecting device detects the position of the steering shaft in a non-contact manner, the position of the steering wheel can be easily and accurately detected, and fine adjustment and accurate control of the position of the steering wheel can be performed. When the position of the steering shaft is detected by a contact-type sensor, for example, a direct-acting resistance sensor, it is inferior to the non-contact type in terms of durability, and the range of the voltage difference cannot be sufficiently secured, and the position detection accuracy decreases. I do. Further, compared to the contact type, the device is less affected by noise and less affected by temperature fluctuation.

The position of the steering wheel means a tilt position corresponding to the inclination of the steering wheel, a telescopic position corresponding to the amount of extension of the steering wheel, and the like.

It is preferable that the position detecting device detects the position digitally. For example, it can be composed of a magnetic pulser device, an optical pulser device, a dielectric pulser device, an electric capacity pulser device, and the like that generate a signal corresponding to the rotation of the electric motor. This makes it possible to detect the position with high durability and with certainty and reproducibility.

Further, the pulser device constituting the position detecting device can be integrated with the electric motor. This enables position detection based on the amount of rotation of the electric motor, so that the position detection device can be made small and precise, and the position detection of the steering wheel can be made simple and accurate.

If the electric motor is a DC brush motor, a ripple voltage or higher-order noise is used as a pulse,
Position control can also be performed. Further, if the electric motor is a DC brushless motor having a rotation position detection mechanism including a Hall element, a tachogenerator, and the like, the position of the steering wheel can be detected based on the output of such a rotation position detection mechanism. Become.

When the position detecting device is integrated with the electric motor, an appropriate telescopic mechanism is further provided for converting the rotation of the electric motor into a linear motion to shift the steering column. The position detection device and the position detection device can be integrated. When the tilt position and the telescopic position of the steering wheel are individually adjusted, the telescopic mechanism, the electric motor, and the position detecting device as described above can be provided as an integrated unit for each of the tilt and the telescopic. . As a result, adjustments can be reduced and types of parts can be reduced, so that cost can be reduced.

Further, according to the second aspect of the present invention, a steering shaft on which a steering wheel is mounted at a rear end portion, a tilting operation that supports the steering shaft rotatably and a fulcrum about a tilt pivot, and the steering shaft An electric steering system comprising: a steering column capable of telescopic movement along the axial direction of the steering column; an electric tilt actuator used for tilt movement of the steering column; and an electric telescopic actuator used for telescopic movement of the steering column. A column device is proposed in which the electric tilt actuator and the electric telescopic actuator are the same.

According to the present invention, since the electric tilt actuator and the electric telescopic actuator are the same product, it is possible to reduce the number of molding dies for the actuator main body, improve the mass productivity, and to simplify the assembling work. And rationalization of the assembly line.

According to a third aspect of the present invention, in the electric steering column apparatus of the first or second aspect, the electric actuator includes an electric motor and a rod driving mechanism held by an actuator body as constituent elements, It is proposed that the rod drive mechanism has a gear shaft including a driven gear portion driven by a drive gear on the electric motor side and a shaft portion rotatably held by the actuator body via a bearing.

According to the present invention, for example, by forming the gear shaft as an integrally molded product made of a synthetic resin, improvement in mass productivity and reduction in weight can be easily realized.

According to a fourth aspect of the present invention, there is provided the electric steering column apparatus according to the third aspect, wherein a first deformed portion projecting from an inner diameter of the bearing is formed on an outer peripheral surface of the shaft portion. .

According to the present invention, for example, a ridge or an annular projection is formed as a first deformed portion on the outer peripheral surface of the shaft portion, so that the first deformed portion is plastically or elastically deformed. The pressure input when the shaft is press-fitted into the inner ring can be made constant, and the deformation (diameter reduction) of the shaft portion can be prevented from becoming unnecessarily large.

According to a fifth aspect of the present invention, there is provided the electric steering column apparatus according to the third or fourth aspect, wherein a second deformed portion is formed on a side surface of the driven gear to be in contact with an inner ring side surface of the bearing. I do.

According to the present invention, for example, by forming a radially ridge or a concentric projection as a second deformable portion on the side surface of the driven gear, the second deformable portion is plastically or elastically deformed, so that the second deformable portion is deformed or elastically deformed. Preload management of the bearing can be easily and reliably performed.

According to the sixth aspect of the present invention, there is provided the third to fifth aspects.
In the electric steering column device of (1), a female screw is formed on the axis of the gear shaft, and the actuator has an actuator rod formed with a male screw to be screwed with the female screw, and the female screw has a lubricating oil. It is proposed that the holding groove is formed.

According to this invention, for example, even if a metric screw which is easy to machine is employed as the female screw or the male screw, the threaded portion is lubricated by the grease supplied from the lubricating oil holding groove, so that a smooth operation is achieved. And long-term durability.

According to the seventh aspect of the present invention, the third to sixth aspects are provided.
It is proposed that the driven gear section is formed of a gear base, a ring gear externally fitted to the gear base, and an elastic body interposed between the gear base and the ring gear.

According to the present invention, the backlash noise and the like during the reverse rotation of the electric motor can be reduced, and the wear of the drive gear and the ring gear can be reduced.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an electric steering column device according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing an electric steering column device of the first embodiment. This electric steering column device 1 employs a so-called swing tilt method, and holds a steering shaft 3 extending from a steering wheel 2 and connected to a steering gear (not shown) so as to be rotatable around its axis. The steering column includes three steering columns, namely, an upper column 4, a middle column 5, and a lower column 6. Then, by appropriately adjusting the relative positions of the columns 4, 5, and 6, the steering shaft 3, and thus the steering wheel 2, is held at a desired position.

The upper column 4 has a universal joint (not shown) of the steering shaft 3 in the internal space.
Is housed. The upper column 4 has a tilt hinge pin 5 attached to a fork portion 51 formed at the rear end of the middle column 5.
It is tiltably attached via 1a. That is, the tilt position of the steering wheel 2 can be adjusted by appropriately swinging the upper column 4 with the tilt hinge pin 51a as a fulcrum.

The middle column 5 is fitted inside the lower column 6.
It is slidable in the axial direction together with the fork portion 51 which is held and supports the upper column 4. That is, by appropriately moving the middle column 5 with respect to the lower column 6 fixed to the vehicle body, the upper column 4 moves in the axial direction together with the steering shaft 3 to adjust the telescopic position of the steering wheel 2. Can be.

The tilt position of the upper column 4 is adjusted by an electric tilt actuator 7. The main components of the electric tilt actuator 7 include an electric motor 71 provided with a gear box 70, a telescopic rod device 72 driven by the electric motor 71, and a position detecting device 73 for detecting a rotation amount of the electric motor 71. Elements.

The actuator rod 72a extending from the telescopic rod device 72 expands and contracts in accordance with the rotation of the electric motor 71, and the amount of expansion and contraction at this time is digitally detected by the position detector 73 as the number of rotations of the electric motor 71. .

The front end of the telescopic rod device 72 is pivotally connected to a bracket 52 fixed to the middle column 5 with a pin 53, and forms a hinge. The rear end of the actuator rod 72a is pivotally connected to a bracket 42 fixed to the upper column 4 with a pin 43, and forms a hinge. Therefore, if the actuator rod 72a is gradually extended from the telescopic rod device 72, the upper column 4 rotates smoothly counterclockwise with respect to the middle column 5, and the steering wheel 2 can be gradually inclined upward. . On the other hand, the telescopic rod device 72
If the actuator rod 72a is gradually stored inside,
The upper column 4 smoothly rotates clockwise with respect to the middle column 5, so that the steering wheel 2 can be gradually tilted downward. The tilt angle (tilt position) at this time can be converted from the output of the position detection device 73.

The telescopic position of the upper column 4 is
It is adjusted by an electric telescopic actuator 8 having substantially the same structure as the electric tilt actuator 7. That is, the electric telescopic actuator 8 includes an electric motor 81 provided with a gear box 80, a telescopic rod device 82 driven by the electric motor 81, and a position detection device 83 for detecting a rotation amount of the electric motor 81. And are the main components.

The front end of the telescopic rod device 82 is pivotally connected to a bracket 62 fixed to the lower column 6 with a pin 63 to form a hinge. The rear end of the actuator rod 82a is pivotally attached to a bracket 55 fixed to the fork portion 51 of the middle column 5 with a pin 56, and forms a hinge. Therefore, if the actuator rod 82a is extended from the telescopic rod device 82,
The middle column 5 is extended from the lower column 6, and the steering wheel 2 can be moved backward. On the other hand, if the actuator rod 82a is housed in the telescopic rod device 82, the middle column 5
And the steering wheel 2 can be moved forward.

The bracket 52 fixed to the middle column 5 is guided by a groove 6a formed in the lower column 6, and can slide along the middle column 5 with respect to the lower column 6 along the axial direction. ing.

FIG. 2 is a view for explaining a main part of the electric tilt actuator 7 in the first embodiment. The gear box 70 houses a plurality of gears (not shown) connected to the rotation shaft of the electric motor 71. In the telescopic rod device 72, an annular gear 72b that rotates by receiving power transmitted from the gear box 70, a rod base 72c that is formed with a male screw around it and that is screwed with a female screw on the inner diameter surface of the annular gear 72b. Is provided. Since the electric telescopic actuator 8 has the same structure, the description is omitted here.

FIG. 3 is a diagram for explaining the internal structure of the position detecting device 73. FIG. 3A shows an example of position detection, and FIGS. 3B and 3C show modified examples thereof.

As shown in FIG. 3A, the position detecting device 7
Reference numeral 3 includes a disk-shaped photo interrupter 73a that rotates together with the electric motor 70, and a photo coupler 73b that optically detects a slit s formed in the photo interrupter 73a in a non-contact manner. In the case of the modification shown in FIG. 3B, the position detection device 173 includes a disk-shaped magnetic pulsar 173a that rotates with the electric motor 71 and a magnetic slit s formed in the magnetic pulsar 173a. And a magnetic sensor 173b that detects magnetically without contact. FIG.
In the case of the modification shown in (c), the position detection device 273 is a disc-shaped electrostatic pulsar 27 that rotates with the electric motor 71.
3a and a slit s formed in the electrostatic pulsar 273a
Sensor 27 that detects the proximity of the electrode without contact using an electrode plate
3b. In the above embodiment, the number of the slits s is six. However, for example, the number of the slits s may be four so that four pulses can be obtained by one rotation of the electric motor 71. That is, the number of slits s can be appropriately adjusted according to the required accuracy.

The position detecting device 73 is provided with the electric motor 7.
It can also be composed of a disk-shaped dielectric pulsar that rotates with 1 and a dielectric sensor that detects the proximity of a dielectric region formed in the dielectric pulsar with a coil. If the electric motor 71 is a DC brush motor, a ripple voltage or higher-order noise generated when the brush exceeds the commuter can be used as a position detection pulse. Furthermore, if the electric motor 71 is a DC brushless motor having a hall element, a tachogenerator, and the like, the position of the steering wheel can be detected based on the output of the hall element, the tachogenerator, and the like.

FIG. 4 is a diagram conceptually illustrating a control circuit of the electric motor 71. The rotation amount of the electric motor 71 is controlled by a controller 91 connected to a power supply 90. A detection output of a photocoupler 73b that detects the rotation of a photointerrupter 73a that rotates together with the electric motor 71 is fed back to the controller 91. In addition, since a set value of the tilt angle is input to the controller 91 from a main control device (not shown) and is converted into a rotation amount of the electric motor 71, the photo coupler 73 is used.
b while counting the pulse signal from b.
By rotating in a desired direction, the tilt position of the steering wheel 2 can be brought to a target value.
The control circuit of the electric motor 81 of the electric telescopic actuator 8 is the same as that of FIG.

FIG. 5 is a view for explaining a modification of the electric tilt actuator 7 of FIG. That is, the electric tilt actuator 107 includes an electric motor 171, a telescopic rod device 172 that is directly driven by the electric motor 171 via a worm wheel mechanism, and the like.
A position detecting device 173 for detecting the amount of rotation of the motor 71 is a main component.

FIG. 6 is a schematic configuration diagram showing an electric steering column device of the second embodiment. The electric steering column device 1 employs a so-called waist-tilt method, in which a steering wheel 2 is mounted at a rear end and a steering gear (not shown) is provided at a front end.
Are provided with two steering columns, ie, an upper column 4 and a lower column 6, which hold the connected steering shaft 3 rotatably around its axis, and a fixed bracket 101 fixed to the vehicle body side. And
By appropriately adjusting the inclination of the columns 4 and 6 with respect to the fixed bracket 101 and the relative position between the columns 4 and 6, the steering shaft 3 and the steering wheel 2 are held at desired positions.

The upper column 4 is a steel tube press-formed product. The upper column 4 rotatably holds the steering shaft 3 via a bearing (not shown), and is slidably fitted and held in the lower column 6. In addition, lower column 6
Is a thin die-cast molded product made of an aluminum alloy (hereinafter, referred to as an aluminum die-cast molded product), and has a large number of ribs on an outer peripheral surface in order to secure rigidity. The lower column 6 is swingably connected to the front end of the fixed bracket 101 via a tilt hinge pin 103. Therefore, the tilt position of the steering shaft 3 and the steering wheel 2 can be adjusted by appropriately swinging the lower column 6 with respect to the fixed bracket 101. In the present embodiment, the fixing bracket 101 is also an aluminum die-cast product similar to the lower column 6.

In the case of the present embodiment, the tilt position of the steering wheel 2 is adjusted by the electric tilt actuator 7. The electric tilt actuator 7 includes an electric motor 71, a rod driving mechanism 103, an actuator body 105 of an aluminum die-cast molded product used for holding the electric motor 71 and the rod driving mechanism 103, as shown in a cross-sectional view in FIG. . The rod drive mechanism 103 includes a gear shaft 109 rotatably held on an actuator body 105 via a pair of bearings 107, and a gear shaft 10.
Male screw 1 screwed into female screw 111 formed on the axis of No. 9
13 has a hollow actuator rod 115 formed on the outer peripheral surface as a main component. In the second embodiment, the same position detecting means as in the first embodiment is provided, but the description is omitted because the description is complicated.

The gear shaft 109 of this embodiment is an injection-molded product of a synthetic resin, and as shown in a perspective view in FIG. 8, a driven gear section driven by a drive gear 119 on the electric motor 71 side via an idler gear 117. 121
And a pair of shaft portions 125 that are press-fitted into the inner ring 123 of the bearing 107. Further, the driven gear portion 121 includes a disk-shaped gear base 127 and a gear ring 131 of a synthetic resin injection molded product which is externally fitted to the gear base 127 via a synthetic rubber ring 129 having a predetermined thickness (for example, 1 to 3 mm). I have.

The electric tilt actuator 7 of this embodiment
By adopting such a configuration, even if a backlash exists between the drive gear 119, the idler gear 117, and the gear ring 131, the synthetic rubber ring 129 causes the backlash when the electric motor 71 reversely rotates. The shock that is generated is absorbed and noise is reduced.

The shaft portion 125 has a plurality of serration-like ridges 1 on its outer peripheral surface as a first deformed portion.
33 are formed along the axial direction, while the driven gear portion 121 has a large number of radial projections 135 formed on the side surface thereof as second deformation portions. Further, the shaft portion 1
25, a single lubricating oil holding groove 137 is formed along the axial direction by partially cutting out the female screw 111.
The lubricating oil holding groove 137 holds a lubricant such as silicon grease. In the case of the present embodiment, the female screw 111 of the gear shaft 109 and the actuator rod 1
As the 15 male screws 113, metric screws that are easily machined are adopted in place of conventional trapezoidal screws, and the diameters thereof are set relatively large (for example, M14 to M18).

The electric tilt actuator 7 of the present embodiment
With such a configuration, when the shaft portion 125 is press-fitted into the inner ring 123 of the bearing 107, the ridge 133 of the shaft portion 125 is plastically deformed (or elastically deformed) by a predetermined amount. Shaft part 12
The diameter reduction of 5 hardly occurs. Thus, while the inner ring 123 of the bearing 107 is securely fixed to the gear shaft 109, the crimp between the female screw 111 and the male screw 113 is prevented, and the smooth operation of the rod drive mechanism 103 is realized. When the gear shaft 109 and the bearing 107 are set on the actuator body 105,
The radial projection 135 of the driven gear portion 121 is plastically deformed (or elastically deformed) by a predetermined amount, and preload management of the bearing 107 is extremely easy. Further, since the lubricating oil holding groove 137 holding a lubricant is formed in the female screw 111, sufficient lubrication is performed on the threaded portion while using the metric screw for the female screw 111 and the male screw 113, and the rod driving mechanism is formed. 103 smooth operation was realized.

In this embodiment, the front end of the electric tilt actuator 7 is pivotally connected to the lower column 6 via the pin 141 while the rear end of the actuator rod 115 is connected to the pin. 1
43, the tilt swing member 145 of the steel sheet press-formed product
Is connected to the front end. The tilt swing member 145 is
The upper portion of the middle portion is swingably supported by the fixed bracket 101 via a pin 147, while a pin 150 fixed to the lower column 6 is fitted into a rectangular hole 149 formed at the rear end.

Thus, the electric tilt actuator 7
When the actuator rod 115 is extended from the actuator body 105 of FIG.
The lower column 6 pivots downward with the tilt hinge pin 103 as a fulcrum along with the upper column 4 and the steering shaft 3, and the tilt adjustment of the steering wheel 2 upward is performed. You.
When the actuator rod 115 is housed in the actuator body 105 of the electric tilt actuator 7, the tilt swinging member 145 rotates clockwise in FIG. 6, and the lower column 6 moves with the upper column 4 and the steering shaft 3. As a result, the steering wheel 2 is swung downward with the tilt hinge pin 103 as a fulcrum, and the tilt of the steering wheel 2 is adjusted downward.

On the other hand, since the upper column 4 is slidably fitted and held in the lower column 6, the upper column 4 is extended or moved into and out of the lower column 6 so that the steering shaft 3 and the steering wheel 2 can be telescopically moved. The position can be adjusted.

In the case of this embodiment, the telescopic position of the steering wheel 2 is adjusted by an electric telescopic actuator 8. The electric telescopic actuator 8 is exactly the same as the electric tilt actuator 7, and differs only in the mounting form. That is,
The electric telescopic actuator 8 has a front end of the actuator body 105 connected to the lower column 6 via a pin 151, and a rear end of the actuator rod 115 connected to a steel plate stay 155 fixed to the upper column 4 via a pin 153. Have been.

As a result, when the actuator rod 115 is extended from the actuator body 105 of the electric telescopic actuator 8, the upper column 4 and the steering shaft 3 are retracted together with the stay 155, and the telescopic backward of the steering wheel 2 is provided. Adjustments are made. When the actuator rod 115 is housed in the actuator body 105 of the electric telescopic actuator 8, the stay 155
As a result, the upper column 4 and the steering shaft 3 move forward, and the telescopic adjustment of the steering wheel 2 forward is performed.

In the second embodiment, since the electric tilt actuator 7 and the electric telescopic actuator 8 are made the same product, it is possible to obtain the effects on cost and assembly work. That is, since the actuator body 105, the actuator rod 115, and the like are common, the types of molds required for die casting and rolling are reduced, and at the same time, the mass productivity of the electric actuator is greatly improved.
The reduction of manufacturing cost was realized. In addition, even when assembling to the electric steering column device 1, it is not necessary to select the electric actuator, so that the burden on the assembling operator is reduced and there is no danger of mistaken assembly.

The description of the specific embodiment has been completed.
Aspects of the present invention are not limited to these embodiments. For example, in the second embodiment, a large number of ridges 133 are employed as a first deformation portion formed on the shaft portion 125, and a large number of radial projections 135 are formed as a second deformation portion formed on the driven gear portion 121. However, as shown in FIG. 9, the annular projection 161 may be adopted as the first deformed portion, and the concentric annular protrusion 163 may be adopted as the second deformed portion. In addition, regarding the overall configuration of the electric steering column device 1 and the shape of each member, etc.
Modifications can be made as appropriate without departing from the gist of the present invention.

[0055]

As is apparent from the above description, in the electric steering column device of the present invention, the position detecting device detects the position of the steering shaft in a non-contact manner.
Simple and accurate detection of the position of the steering wheel becomes possible, and fine adjustment and accurate control of the position of the steering wheel become possible. When the position of the steering shaft is detected by a contact-type sensor, for example, a direct-acting resistance sensor, it is inferior to the non-contact type in terms of durability, and the range of the voltage difference cannot be sufficiently secured, and the position detection accuracy decreases. I do. Further, compared to the contact type, the device is less affected by noise and less affected by temperature fluctuation.

In the case where the electric tilt actuator and the electric telescopic actuator are made of the same part, the manufacturing cost can be reduced by reducing the number of dies and improving the mass productivity, and the electric power steering apparatus can be assembled. In attaching the electric actuators, it is not necessary to select the electric actuators, so that the burden on the assembling operator is reduced and there is no danger of mistaken assembly.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an electric steering column device of a first embodiment.

FIG. 2 is a partial cross-sectional view illustrating a main part of a position adjustment mechanism in the embodiment.

FIG. 3 is a diagram illustrating a method of digitally detecting a position.

FIG. 4 is a diagram conceptually illustrating a control circuit of the electric motor.

FIG. 5 is a diagram illustrating a modification of a main part of the position adjustment mechanism.

FIG. 6 is a schematic configuration diagram showing an electric steering column device of a second embodiment.

FIG. 7 is a transverse sectional view showing the electric actuator according to the embodiment.

FIG. 8 is a perspective view showing a gear shaft in the embodiment.

FIG. 9 is a perspective view showing a modification of the gear shaft in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric power steering device 2 Steering wheel 3 Steering shaft 4 Upper column 5 Middle column 6 Lower column 7 Electric tilt actuator 8 Electric telescopic actuator 70 Gear box 71 Electric motor 72 Telescopic rod device 73 Position detecting device 80 Gear box 81 Electric motor 82 Telescopic rod Device 83 Position detecting device 101 Fixed bracket 103 Rod drive mechanism 105 Actuator main body 107 Bearing 109 Gear shaft 111 Female screw 113 Male screw 115 Actuator rod 117 Idler gear 119 Drive gear 121 Driven gear part 125 Shaft part 127 Gear base 129 Synthetic rubber ring 131 Gear ring 133 Protrusion ridge Radial projection 137 Lubricating oil holding groove 145 DOO swing member 161 and 163 the annular projection

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sakae Matsumoto 1-8-1, Sojacho, Maebashi, Gunma Japan Inside Seiko Co., Ltd. (72) Inventor Kazuya Fukuda 1-8-1, Sojacho, Maebashi, Gunma No. Japan Seiko Co., Ltd. F-term (reference) 3D030 DD05 DD13 DD15 DD63 DD64

Claims (7)

[Claims] 1. A steering shaft on which a steering wheel is mounted at a rear end portion, a steering column for rotatably supporting the steering shaft, and an electric actuator for driving the steering column to adjust the position of the steering shaft. And a position detecting means for detecting the position of the steering shaft in a non-contact manner. 2. A steering shaft on which a steering wheel is mounted at a rear end portion, a tilting operation with the steering shaft rotatably held and a fulcrum as a fulcrum, and a telescopic operation along an axial direction of the steering shaft. A steering column capable of movement, an electric tilt actuator provided for tilt movement of the steering column, and an electric steering column device provided with an electric telescopic actuator provided for telescopic movement of the steering column, An electric steering column device, wherein the electric tilt actuator and the electric telescopic actuator are the same product. 3. The electric actuator comprises an electric motor and a rod driving mechanism held by an actuator body as constituent elements, wherein the rod driving mechanism is driven by a drive gear on the electric motor side; The electric steering column device according to claim 1 or 2, further comprising a gear shaft including a shaft portion rotatably held via a bearing on the actuator body. 4. The electric steering column device according to claim 3, wherein a first deformed portion protruding from an inner diameter of the bearing is formed on an outer peripheral surface of the shaft portion. 5. The electric steering column device according to claim 3, wherein a second deformed portion is formed on a side surface of the driven gear so as to contact an inner ring side surface of the bearing. 6. A female screw is formed on an axis of the gear shaft, and the actuator has an actuator rod formed with a male screw to be screwed with the female screw, and a lubricating oil holding groove is formed in the female screw. The electric steering column device according to any one of claims 3 to 5, wherein the electric steering column device is formed. 7. The driven gear portion is formed of a gear base, a ring gear externally fitted to the gear base, and an elastic body interposed between the gear base and the ring gear. The electric steering column device according to any one of claims 3 to 6.