JP2008094129A - Electric tilt type steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric tilt type steering device capable of effectively suppressing both of play between a screw shaft and a nut and play between the nut and a nut holder. <P>SOLUTION: This device is provided with a steering column 12 for rotatably supporting a steering shaft 11 mounted with a steering wheel, a tilt bracket 24 for guiding the steering column 12, and an electric actuator 48 for making the steering column 12 guided to the tilt bracket 24 perform a tilt operation. The electric actuator 48 is provided with the screw shaft 35 to be rotated and driven by an electric motor, a nut part 46 screwed on the screw shaft 35 and connected to the steering column 12, and a play suppressing part 47 for suppressing play between the screw shaft 35 arranged in the nut part 46 and a connecting part of the steering column 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes a steering column that rotatably supports a steering shaft on which a steering wheel is mounted, a tilt bracket that guides the steering column, and an electric actuator that tilts the steering column guided by the tilt bracket. The present invention relates to an electric tilt type steering apparatus.

  Conventionally, an electric tilt type steering in which a steering column supported by a tilt bracket so as to be slidable in the vertical direction is moved in a tilt direction by an electric actuator having a screw shaft that is rotationally driven by an electric motor and a nut portion that is screwed to the screw shaft. In the apparatus, in order to smoothly perform the tilting operation, appropriate play is required between the screw shaft and the nut and between the nut and the nut holder holding the nut. However, if there is play between the nut and the screw shaft and the nut holder, the play allows the steering column to be finely moved, and the vibration of the vehicle can be transmitted to the steering wheel, so that the driver can steer the steering wheel. There is an unsolved problem that there is a sense of incongruity.

In order to solve this unsolved problem, for example, conventionally, a shaft having a male screw portion that rotates in conjunction with the output shaft of the drive shaft, and arranged around the male screw portion while being restricted in the rotation direction of the shaft. A substantially inner cylindrical male screw member that meshes with the male screw part and interlocks with a drive target, a biasing member that biases the male screw member in a radial direction, and a contact part that comes into contact with the male screw part. There has been proposed a slider mechanism having a pressing member that receives the reaction force of the urging force of the urging member and acts as a contact force between the male screw portion and the contact portion (see, for example, Patent Document 1).
JP 2000-280916 A (2nd page, FIG. 1 and FIG. 4)

  However, in the conventional example described in Patent Document 1, it is possible to suppress play between the screw shaft and the nut by providing means for pressing the screw shaft into the nut. When the nut is held by the nut holder, both the play between the screw shaft and the nut and the play between the nut and the nut holder cannot be effectively suppressed. There are unresolved issues.

  Therefore, the present invention has been made paying attention to the unsolved problems of the conventional example, and effectively suppresses both play between the screw shaft and the nut and play between the nut and the nut holder. It is an object of the present invention to provide an electric tilt type steering apparatus that can be used.

  In order to achieve the above object, an electric tilt type steering apparatus according to claim 1 includes a steering column that rotatably supports a steering shaft on which a steering wheel is mounted, a tilt bracket that guides the steering column, and the tilt bracket. An electric tilt type steering apparatus provided with an electric actuator for tilting the steering column guided by the electric motor, wherein the electric actuator is screw-engaged with the screw shaft and rotated by an electric motor, and the steering A nut portion connected to the column and a play suppressing portion that suppresses play between the screw shaft disposed in the nut portion and the connecting portion of the steering column are provided.

  According to a second aspect of the present invention, there is provided the electric tilt type steering apparatus according to the first aspect of the invention, wherein the nut portion is formed in a cylindrical shape having a central axis in a direction perpendicular to the screw shaft and is screwed to the screw shaft. And a nut holder having an engaging inner peripheral surface that is in sliding contact with a cylindrical outer peripheral surface of the nut. The nut holder is connected to the steering column, and the nut shaft is connected between the screw shaft and the nut holder. It is characterized in that a play suppressing portion is provided.

  The electric telescopic adjustment type steering apparatus according to a third aspect is the invention according to the first or second aspect, wherein the play suppressing portion includes a first pad that contacts the screw shaft and a nut holder that contacts the nut holder. 2 pads, and an elastic body that urges the pads disposed between the first and second pads in a direction to separate them.

  According to the present invention, since the play suppressing portion that suppresses play between the screw shaft and the coupling portion of the steering column is disposed on the nut portion that is screwed to the screw shaft that tilts the steering column, the nut portion It is possible to effectively suppress play between the screw shaft and the connecting portion of the steering column, to suppress slight vibration of the steering column, and to reliably prevent the driver from feeling uncomfortable. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram showing a vehicle assembled with a steering device according to the present invention, FIG. 2 is a left side view showing a first embodiment of the steering device according to the present invention, and FIG. 4 is a cross-sectional view showing a vehicle body side bracket, FIG. 5 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 6 is a cross-sectional view taken along line BB in FIG. 7 is a view showing a nut portion, where (a) is an enlarged cross-sectional view, (b) is a cross-sectional view taken along the line CC in (a), and FIG. 8 is a cross-sectional view taken along the line DD in FIG. FIG.

  In FIG. 1, a steering column device 10 includes a steering column 12 that supports a steering shaft 11 so as to be rotatable. A steering wheel 13 is mounted at the rear end of the steering shaft 11, and an intermediate shaft 15 is connected to the front end of the steering shaft 11 via a universal joint 14. A steering gear 17 composed of a rack and pinion mechanism or the like is connected to the intermediate shaft 15 via a universal joint 16 at its front end. The output shaft of the steering gear 17 is connected to the steered wheel 19 through a tie rod 18.

When the driver steers the steering wheel 13, the rotational force is transmitted to the steering gear 17 via the steering shaft 11, the universal joint 14, the intermediate shaft 15, and the universal joint 16, and the rack and pinion mechanism rotates the vehicle. The steered wheel 19 is steered through the tie rod 18 after being converted into a linear motion in the width direction.
In addition, peripheral parts P such as a control switch, a combination switch, a column cover, and the like for driving an electric tilt mechanism 30 and an electric telescopic mechanism 50 described later are disposed at a rear portion of the steering column 12 in the vehicle.

As shown in FIGS. 2 and 3, the steering column device 10 includes a steering shaft 11 to which a steering wheel 13 is attached, and a steering column 12 that rotatably supports the steering shaft.
The steering column 12 includes an outer column 12a and an inner column 12b that is slidably held by the outer column 12a, and is a rolling bearing disposed on the inner peripheral surface of the front and rear ends of the inner column 12b (see FIG. The steering shaft 11 is rotatably supported by an unillustrated).

  The outer column 12a is provided with an electric power steering device 60, which will be described later, at the front end of the vehicle on the universal joint 14 side (left end in FIG. 2), and in an insertion hole 61a formed in the gear housing 61 of the electric power steering device 60. As shown in FIG. 4, the inserted tilt pivot shaft 62 is fixed to a pair of left and right vehicle body side brackets 63 attached to the vehicle body side member 21.

  Here, as shown in FIG. 4, a flanged bush 61b made of synthetic resin and having elasticity is attached to the insertion hole 61a of the gear housing 61, and left and right vehicle body side brackets are attached to the inner peripheral surface of the flanged bush 61b. A cylindrical collar 61c reaching between 63 is inserted. The tilt pivot shaft 62 has a configuration in which a bolt head 62a is formed at one end and a male screw portion 62b is formed at the other end.

  The tilt pivot shaft 62 has one insertion hole 63a in a state where the axial centers of the insertion hole 63a formed in the vehicle body side bracket 63 and the cylindrical collar 61c mounted in the insertion hole 61a of the housing 61 are aligned. Is inserted into the cylindrical collar 61c through the other insertion hole 63a so that the male screw portion 62b protrudes, and the nut 62c is screwed into the protruded male screw portion 62b to be attached to the vehicle body side bracket 63. .

Further, the rear end (right end in FIG. 2) of the outer column 12a on the steering wheel 13 side is supported by a tilt bracket 24 attached to the vehicle body side member 21 so as to be movable in the vertical direction.
As shown in FIG. 5, the tilt bracket 24 includes a mounting plate portion 24 b having a bulging portion 24 a with a central portion bulging upward as viewed from the front and attached to the vehicle body side member 21 (see FIG. 2). Guide plate portions 24c and 24d for guiding the steering column 12 extending downward from the left and right positions of the bulging portion 24a of the mounting plate portion 24b, and a bottom plate portion 24e for connecting the lower end portions of the guide plate portions 24c and 24d, It is formed in a square frame shape.

Further, the outer column 12 a described above is inserted between the guide plate portions 24 c and 24 d of the tilt bracket 24. As is apparent from FIG. 5, the outer column 12a is formed with guide portions 12d and 12e that protrude in the horizontal direction and have vertical contact surfaces 12c that contact the inner peripheral surfaces of the guide plate portions 24c and 24d at their ends. Has been.
And the guide part 12e is hold | maintained by the electric tilt mechanism 30 so that a vertical movement is possible. As shown in FIG. 5, the electric tilt mechanism 30 is a rolling bearing 33 fixedly disposed by a restraining member 32 in a substantially rectangular frame-shaped gear housing 31 formed integrally with the lower end portion of the guide plate portion 24 d of the tilt bracket 24. And a screw shaft 35 that extends in the vertical direction along the guide plate portion 24d and is rotatably supported by the rolling bearing 34 disposed on the lower surface of the mounting plate portion 24b of the tilt bracket 24 described above.

  A worm wheel 36 is mounted on the screw shaft 35 in the vicinity of the rolling bearing 33 in the gear housing 31, and a worm 37 is engaged with the worm wheel 36. As shown in FIG. 6, the worm 37 is rotatably held by rolling bearings 38 and 39 disposed in the gear housing 31, and one end of the worm 37 is formed on the guide plate portion 24d of the tilt bracket 24. The output shaft 40a of the electric motor 40 fixed to the plate portion 24j is connected via a coupling 40b.

  A cylindrical cover 41 that covers the screw shaft 35 is disposed in an insertion hole 31 a through which the screw shaft 35 of the gear housing 31 is inserted, and a large elasticity that slides on the outer peripheral surface of the screw shaft 35 at the tip of the cylindrical cover 41. A damper 42 made of a synthetic resin, such as polyurethane, is disposed. Similarly, a damper 43 slidably contacting the outer peripheral surface of the screw shaft 35 is also provided on the lower end surface of the rolling bearing 34.

Then, between the dampers 42 and 43 of the screw shaft 35, a nut holder 44 having a square outer shape as viewed from FIG. 5 and a circular inner surface 44 a formed on the inner peripheral side of the nut holder 44 as viewed in FIG. The outer circumferential cross section having a center line perpendicular to the axial direction of the screw shaft 35 is formed in a cylindrical shape, and is engaged with the circumferential direction so as to be rotatable and axially movable. A nut portion 46 including a nut 45 formed with a female screw portion 45a that is screwed into the extending screw shaft 35 is disposed.
Here, the nut holder 44 engages in a guide groove 24g formed in the guide plate portion 24d of the tilt bracket 24 and extending in the vertical direction, so that the rotational movement around the axis of the screw shaft 35 of the nut holder 44 is performed. The nut 45 is moved up and down by forward and reverse rotation of the screw shaft 35 and the nut holder 44 is moved in the up and down direction, and the nut holder 44 is rotatable with respect to the nut 45 in the circumferential direction of the cylindrical surface. In addition, relative movement in the axial direction is possible. Further, as shown in FIGS. 7A and 7B, the nut holder 44 is formed with a long hole 44b extending in the vehicle front-rear direction through which the screw shaft 35 is inserted, and the screw shaft 35 is formed in the long hole 44b. By being inserted, the nut holder 44 and the screw shaft 35 are relatively movable in the vehicle front-rear direction.

  An outer peripheral cylindrical engagement pin 44c protruding from the nut holder 44 toward the outer column 12a is engaged with the round hole 24h formed at the tip of the outer column 12a. Further, an outer peripheral cylindrical engagement pin 44d protruding from the nut holder 44 on the opposite side to the outer column 12a is engaged with a bracket 12f attached to the outer column 12a. With this configuration, the nut holder 44 is supported so as to be swingable about the engaging pins 44c and 44d.

As shown in FIG. 7A, the nut portion 46 is formed with a through hole 45b extending inward in the radial direction from the outer peripheral cylindrical surface in the nut 45. The screw shaft 35 and the nut holder are formed in the through hole 45b. A play restraining portion 47 that restrains play with 44 is provided.
The play suppressing portion 47 includes a first pad 47 a that engages with the screw shaft 35, a second pad 47 b that engages with the inner peripheral surface of the nut holder 44, and the first pad 47 a and the second pad. And a disc spring 47c as an elastic body that urges both of them in a direction to separate them, and the first pad 47a is urged toward the screw shaft 35 by the disc spring 47c. The second pad 47b is biased toward the nut holder 44 side.

Therefore, the play between the screw shaft 35 and the nut 45 can be suppressed by the first pad 47a, and the play between the nut 45 and the nut holder 44 can be suppressed by the second pad 47b. it can.
Here, as shown in FIG. 8, the first pad 47 a has a cylindrical surface 47 d that contacts the outer peripheral surface of the screw shaft 35 on the left side surface, and a columnar engagement convex portion 47 e that protrudes on the right side surface. A disc spring 47c is disposed around the engaging projection 47e. On the other hand, the second pad 47b has an engagement recess 47f that engages with the engagement protrusion 47e of the first pad 47a on the left side, and a cylindrical surface 47g that contacts the cylindrical surface of the nut holder 44 on the right side. Is formed. The cylindrical surface 47d of the first pad 47a and the cylindrical surface 47g of the second pad 47b are preferably coated with a low friction coefficient film made of synthetic resin or the like.

Then, when the worm 37 is driven forward and backward by the electric motor 40, the screw shaft 35 is driven forward and backward via the worm wheel 36, whereby the nut holder 44 is moved up and down, and the outer column 12 a moves the tilt pivot shaft 62. The tilt function can be exhibited by swinging up and down as the center.
The screw shaft 35, the worm wheel 36, the worm 37, the electric motor 40, and the nut portion 46 constitute an electric actuator 48.

An electric telescopic mechanism 50 as an electric actuator is provided between the outer column 12a and the inner column 12b of the steering column 12.
As shown in FIG. 2, the electric telescopic mechanism 50 includes an electric motor connected via a connection holding member 51 that slides and separates when the impact load on the outer column 12a exceeds a set collapse load. And a motor housing 52 having a built-in worm speed reducer connected to the output shaft, and moved back and forth by being screwed into a female screw formed on the inner peripheral surface of the worm wheel constituting the worm speed reducer in the motor housing 52. And a connecting plate 54 that connects the tip of the connecting rod 53 and the inner column 12b. By rotating the electric motor forward and backward, the connecting rod 53 moves back and forth in the column axis direction. Thus, the telescopic function can be exhibited by moving the inner column 12b back and forth with respect to the outer column 12a.

  Further, as shown in FIGS. 2 and 3, the electric power steering device 60 includes a gear housing 61 incorporating a worm reduction gear integrally connected to the vehicle front side end portion of the outer column 12 a, and the gear housing 61. The electric motor 65 is connected, and the control unit 66 is provided with a drive control unit that drives and controls the electric motor 65. The gear housing 61 is formed with the insertion hole 61a through which the tilt pivot shaft 62 is inserted, as described above.

Next, the operation of the above embodiment will be described.
Now, in order for the driver to adjust the tilt of the steering column 12 of the steering column device 10, the combination for the tilt mechanism provided in the peripheral part P provided in the vehicle rear portion of the steering column 12 shown in FIG. When the switch is operated in the tilt-up direction (or tilt-down direction), the electric motor 40 of the electric tilt mechanism 30 is driven forward (or reverse), for example.

  In response to this, by driving the screw shaft 35 in reverse (or forward) via the worm 37 via the worm 37, the nut 45 moves upward (or downward) as viewed in FIG. Since the engaging pin 44a formed on the nut holder 44 is engaged with the hole 24k formed on the outer column 12a of the steering column 12, the outer column 12a rotates upward (downward) about the tilt pivot shaft 62. And tilt up (or tilt down) adjustment.

  When the outer column 12a is tilted, the nut portion 46 moves along a moving locus on an arc centered on the tilt pivot shaft 62, but the nut holder 44 and the nut 45 can be moved relative to each other. Since the nut holder 44 and the screw shaft 35 are movable in the vehicle longitudinal direction, the arc movement of the nut 45 can be absorbed, and a gap between the nut holder 44 and the nut 45 is eliminated. be able to.

  At this time, the play suppressing portion 47 is disposed in the nut 45, and the play suppressing portion 47 engages with the screw shaft 35 and the second pad that engages with the inner peripheral surface of the nut holder 44. 47b and a disc spring 47c interposed between the first pad 47a and the second pad 47b, the first pad 47a is biased to the screw shaft 35 by the elastic force of the disc spring 47c. The second pad 47b is urged toward the inner peripheral surface of the nut holder 44, and play between the nut 45, the screw shaft 35, and the nut holder 44 can be reliably suppressed.

  For this reason, the nut holder 44 is connected to the screw shaft 35 without play, and the guide portion 12e of the outer column 12a is connected to the nut holder 44 via the engaging pin 44c, and the engaging pin 44d. Since the bracket 12f attached to the outer column 12a is connected via the, the outer column 12a is connected to the screw shaft 35 without causing play.

  Therefore, even when vehicle body vibration or the like is transmitted to the steering column 12, it is possible to reliably prevent the steering column 12 from vibrating due to play generated between the steering column 12 and the screw shaft 35. It is possible to reliably prevent the driver's steering feeling from being deteriorated by being transmitted to the wheel 13, and to eliminate the uncomfortable feeling given to the driver.

In addition, in order for the driver to perform telescopic adjustment of the steering column 12 of the steering column device 10, a telescopic mechanism combination switch provided in a peripheral part P disposed in the rear portion of the steering column 12 shown in FIG. Is operated in the expansion direction (or contraction direction), the electric motor of the electric telescopic mechanism 50 is driven forward (or reverse), for example.
As a result, a worm wheel (not shown) of the worm reduction gear is driven to rotate forward (or reversely), whereby the connecting rod 53 moves to the steering wheel 13 side (or the side opposite to the steering wheel 13).

For this reason, the inner column 12b is pulled out from the outer column 12a via the connecting plate 54 (or the inner column 12b is inserted into the outer column 12a), and the steering column 12 is expanded (or contracted) to perform telescopic adjustment. be able to.
At this time, although not shown, the outer shaft of the steering shaft 11 moves relative to the inner shaft as the inner column 12b moves.

  As described above, when the connecting rod 53 is moved by the electric motor by the electric telescopic mechanism 50, the motor housing 52 is connected and held to the outer column 12a by the connecting and holding member 51, so that the steering column 12 is expanded and contracted. Although telescopic adjustment can be performed, when an impact load in the horizontal direction of the vehicle acts on the steering wheel 13 due to a secondary collision, the inner column 12b and the steering shaft 11 are viewed in FIG. When the connecting rod 53 is pushed to the left side and the connecting rod 53 is moved to the left via the connecting plate 54 according to this, an impact load is transmitted to the connecting holding member 51 via the motor housing 52. When the impact load transmitted to the connection holding member 51 reaches a set collapse load, the connection holding member 51 can be detached from the outer column 12a to ensure a predetermined collapse stroke.

  On the other hand, in the electric power steering apparatus 60, a drive control unit in the control unit 66 calculates a steering assist command value based on a steering torque detected by a steering torque sensor (not shown), and performs electric driving based on the calculated steering assist command value. By controlling the driving of the motor 65, the electric motor 65 generates a steering assisting force, and this steering assisting force is transmitted to the output side 11a of the steering shaft 11 via the worm reduction gear. Can be steered with a light steering force.

As described above, when the electric power steering device 60 generates the steering assist force for the steering shaft 11, the reaction force against the steering assist force is transmitted to the outer column 12 a via the gear housing 61.
For this reason, the outer column 12a rotates, but in the vehicle body side bracket 63, the outer column 12a is displaced by its elastic deformation to allow the rotation.

On the other hand, in the tilt bracket 24, the rotation of the outer column 12a is caused by a gap provided between the guide plate portions 24c and 24d and the guide portions 12d and 12e formed on the outer column 12a or by bending of the guide plate portions 24c and 24d. Can be tolerated.
The rotation of the outer column 12a is transmitted to the nut holder 44 through the engagement pin 44c. Since the inner peripheral surface of the nut holder 44 is engaged with the cylindrical surface of the nut 45, the nut holder 44 is By rotating with respect to the nut 45, the rotation of the outer column 12a can be absorbed. Since the rotation of the outer column 12a can be absorbed by the rotation of the nut holder 44 in this way, the rotation of the outer column 12a can be avoided from affecting the nut 45, and the smooth movement of the nut 45 is ensured. be able to.

In the above embodiment, the case where the contact surface that contacts the screw shaft 35 of the first pad 47a constituting the play suppressing portion 47 is formed on the cylindrical surface 47d is described, but the present invention is not limited to this. Instead, as shown in FIG. 9, a female screw 47h that is screwed onto the screw shaft 35 may be formed on the cylindrical surface 47d.
Moreover, in the said embodiment, although the through-hole 45b with a circular cross section was formed in the nut 45 and the case where the 1st pad 47a and the 2nd pad 47b were formed in the column shape was demonstrated, it is limited to this. Instead, the through hole 45b may be formed in a square cross section, and the first pad 47a and the second pad 47b may be formed in a prismatic shape accordingly. Further, the engaging convex portion 47e of the first pad 47a and the engaging concave portion 47f of the second pad 47b may be omitted.

  Furthermore, in the above-described embodiment, the case where the disc spring 47c is inserted as an elastic body between the first pad 47a and the second pad 47b has been described. However, the present invention is not limited to this, and the coil spring or rubber is not limited thereto. Any elastic body such as a soft synthetic resin can be applied, and either one or both of the first pad 47a and the second pad 47b may be formed of an elastic body.

Furthermore, in the above-described embodiment, the case where the play suppressing portion 47 urges the first pads 47a and 47b in the direction perpendicular to the column axis by the disc spring 47c has been described. However, the present invention is not limited to this. The first pads 47a and 47b may be biased in a direction parallel to the column axis.
Furthermore, in the above-described embodiment, the case where the electric tilt mechanism 30 and the electric telescopic mechanism 50 adjust the position by the driver's operation has been described. However, the present invention is not limited to this, and the steering position when the driver gets on and off. The present invention can also be applied to a mechanism that automatically moves the motor to the operating position and the retracted position.

Furthermore, in the above-described embodiment, the case where the tilt bracket 24 is formed in a rectangular frame shape when viewed from the front is described, but the present invention is not limited to this, and one of the bulging portion 24a and the bottom plate portion 24e is not limited thereto. Can be omitted to form a portal, or both the bulging portion 24a and the bottom plate portion 24e can be omitted to form a left and right separated shape.
In the above embodiment, the case where the outer column 12a of the steering column 12 is fixed to the vehicle body side member 21 via the tilt bracket 24 has been described. However, the present invention is not limited to this, and the inner column 12b is mounted on the vehicle body side. The bracket 63 and the tilt bracket 24 may be attached to the vehicle body side member 21, and the steering wheel 13 may be attached to the outer column 12a side.

  Furthermore, although the case where the motor housing 52 of the electric telescopic mechanism 50 is connected to the outer column 12a via the connection holding member 51 has been described in the above embodiment, the present invention is not limited to this, and the motor housing 52 is connected to the outer column 12a. The connecting rod 53 may be directly connected to the column 12a so that the connecting rod 53 can be contracted by an inner rod and an outer rod, and a connection holding portion may be formed in the contracting portion.

  Furthermore, in the above embodiment, the case where the electric telescopic mechanism 50 and the electric power steering device 60 are provided has been described. However, the present invention is not limited to this, and either one or both may be omitted. Good.

1 is an overall configuration diagram illustrating a state in which a steering device according to the present invention is mounted on a vehicle. It is a left side view except a steering wheel of a steering column device. It is a right view except for the steering wheel of the steering column device. It is sectional drawing which shows an example of a vehicle body side bracket. It is sectional drawing on the AA line of FIG. It is sectional drawing on the BB line of FIG. It is a figure which shows a nut part, Comprising: (a) is an expanded sectional view, (b) is sectional drawing on CC line of (a). It is an expanded sectional view on the DD line of Fig.7 (a). It is sectional drawing which shows the modification of a 1st pad.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Steering column apparatus, 11 ... Steering shaft, 12 ... Steering column, 12a ... Outer column, 12b ... Inner column, 13 ... Steering wheel, 14, 16 ... Universal joint, 15 ... Intermediate shaft, 17 ... Steering gear, 18 ... Tie rod, 19 ... steering wheel, 21 ... vehicle body side member, 24 ... tilt bracket, 30 ... tilt mechanism, 35 ... screw shaft, 40 ... electric motor, 44 ... nut holder, 44c, 44d ... engagement pin, 45 ... nut, 46 ... Nut part, 47 ... Play restraining part, 47a ... First pad, 47b ... Second pad, 47c ... Belleville spring, 50 ... Telescopic mechanism, 60 ... Electric power steering device, 61 ... Gear housing, 62 ... Tilt Pivot shaft 63 ... Body side bracket 65 ... Electric motor 66 ... Con Roll unit

Claims (3)

Electric tilt type equipped with a steering column that rotatably supports a steering shaft equipped with a steering wheel, a tilt bracket that guides the steering column, and an electric actuator that tilts the steering column guided by the tilt bracket A steering device,
The electric actuator includes: a screw shaft that is rotationally driven by an electric motor; a nut portion that is screwed to the screw shaft and coupled to the steering column; and the screw shaft disposed on the nut portion and a coupling portion of the steering column An electric tilt type steering apparatus, comprising: a play restraining portion that restrains play between the two.   The nut portion is formed in a cylindrical shape having a direction perpendicular to the screw shaft as a central axis, and has a nut that engages with the screw shaft, and a nut having an inner peripheral surface that is in sliding contact with the cylindrical outer peripheral surface of the nut. 2. The electric tilt according to claim 1, further comprising: a holder, wherein the nut holder is coupled to the steering column, and the play suppressing portion is disposed between a screw shaft of the nut and the nut holder. Steering device.   The play restraining portion is configured to separate the first pad that contacts the screw shaft, the second pad that contacts the nut holder, and the both disposed between the first and second pads. The electric tilt type steering apparatus according to claim 1, wherein the electric tilt type steering apparatus is configured by an elastic body to be urged.

Images