JP4179023B2 - Tilt steering device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tilt steering apparatus configured to be capable of tilt adjustment in which a tilt angle of a steering column supported in a vehicle interior is changed in accordance with a driving posture of a driver.
[0002]
[Prior art]
Vehicle steering is performed by applying a steering torque applied to a steering member arranged inside the passenger compartment to a steering mechanism arranged outside the passenger compartment for steering steering wheels (generally front wheels). Done. In a steering apparatus for performing such steering, a steering wheel (steering member) is attached to an upper end of a steering column supported inside a passenger compartment so as to face a driver, and a lower end of the steering column is attached to the steering column. It is connected to the steering mechanism.
[0003]
In such a steering apparatus, the steering column is supported in the interior of the passenger compartment while maintaining an inclined posture with the mounting portion of the steering wheel facing upward. In recent years, the inclination angle of the steering column that is supported in this manner is inclined. A tilt steering device that adjusts (tilt angle) so that the position of a steering wheel operated by a driver can be changed in accordance with a driving posture has been put into practical use.
[0004]
This tilt steering device pivotally supports the lower portion of the steering column so as to be swingable about a substantially horizontal support shaft, and the upper portion of the steering column is fixed to a column bracket fixed to the steering column and the vehicle body. The structure is supported by a tilt bracket provided.
[0005]
The tilt bracket includes a pair of side plates formed with arc-shaped long holes (tilt holes) around the lower support shaft, and the column bracket is fitted between the side plates of the tilt bracket, The tilt angle is adjusted by swinging the column housing and the steering column around the lower support shaft by moving the tilt shaft with the tilt hole as a guide. This is realized by a procedure in which the tilt shaft is locked so as not to move at a position where a desired tilt angle is obtained, and the column bracket is held between the side plates of the tilt bracket via the tilt shaft.
[0006]
The tilt shaft is generally a bolt having a screw portion on the outer peripheral surface of the protruding portion from one side plate of the tilt bracket, and the screw portion of the bolt is integrally formed with a base portion of a tilt lever of an appropriate length. The adjustment of the tilt angle is performed by loosening the nut of the base by one-way operation of the tilt lever, and the tilt lock after this adjustment is performed by operating the tilt lever in the reverse direction. This is realized by tightening a nut (see, for example, Patent Document 1).
[0007]
Further, as another lock means for performing tilt lock, a pair of cylinders externally fitted in the middle of the tilt axis so as to be movable in the axial length direction and disposed inside the column bracket, and between these, A locking means configured to press the cylinders away from each other by the action of the cam, and press the cylinders to the inside of the column bracket to hold the column bracket between the side plates of the tilt bracket. (For example, refer to Patent Document 2).
[0008]
[Patent Document 1]
JP-A-8-11725 [Patent Document 2]
Japanese Patent Laid-Open No. 2000-25622
[Problems to be solved by the invention]
However, in the tilt steering device disclosed in Patent Document 1, the tilt lever operated for tilt locking is disposed outside the tilt bracket so as to be swingable in a plane perpendicular to the axial direction of the tilt shaft. Therefore, it is necessary to secure this rocking space around the steering column, the space around the driver's legs is limited, the comfort of the interior of the vehicle interior is deteriorated, and the accelerator operation, brake operation, etc. There was a risk of hindering driving operations.
[0010]
Further, in the tilt steering device disclosed in Patent Document 2, the lock means includes two cylinders, a cam, and a rotation operation means for the cam, and there is a problem that the number of parts is large and the configuration is complicated. is there.
[0011]
Further, in the tilt steering device disclosed in Patent Document 2, the side plates of the column bracket and the tilt bracket are extended below the support position of the steering column so that the cams arranged inside the column bracket can be operated. In addition, the cylinder is externally fitted on a tilt shaft horizontally mounted on the extension, and a cam is disposed between the cylinders. A column bracket and a tilt are provided around the steering column. It is necessary to secure a space for disposing the extension portion of the bracket and a swinging space for the tilt lever for rotating the cam, and like the tilt steering device disclosed in Patent Document 1, There was a problem that the space was limited.
[0012]
The present invention has been made in view of such circumstances, and a lock means for locking the steering column after adjusting the tilt can be configured compactly around the steering column to ensure a sufficient space around the driver's legs. An object of the present invention is to provide a tilt steering device that does not cause deterioration of comfort and driving operability.
[0013]
[Means for Solving the Problems]
A tilt steering device according to a first aspect of the present invention is configured such that a column bracket fixed to a steering column is fitted between a pair of side plates of a tilt bracket fixed to a vehicle body, and tilt holes formed in these side plates are fitted. The tilt shaft supporting the column bracket is inserted, and the tilt angle of the steering column, which is changed by the movement of the tilt shaft along the tilt hole, is tightened to the side plate of the tilt bracket via the tilt shaft. in the tilt steering device for locking by, fitted held in the projecting portion of the tilt axis to the outside of the side plate, a lock cylinder which is supported one side on the outer surface of the side plate, around its own axis in the lock cylinder is rotatably supported in a lock shaft extending through the tilt axis in the radial direction, extends from the support portion to the lock cylinder Formed continuously on the other side of the serial lock shaft, and the tilt lever extending at the lock shaft substantially perpendicular, is formed on a part of the lock shaft, the rotation operation in the extending surface of the tilt lever depending rotates about the axis of the lock shaft, and characterized in that the locking cylinder acts on the penetrating portion of the support portion and the tilt axis to the lock cylinder and a lock cam for biasing the said plate To do.
[0014]
In the present invention, the lock shaft is extended in an appropriate direction orthogonal to the axial direction of the tilt shaft, and the tilt lever is connected to the extension side end of the lock shaft at a substantially right angle with the lock shaft. When the tilt lever is operated, the lock shaft rotates about its own axis , and the lock cam formed on a part of the lock shaft is fitted on the protrusion of the tilt shaft from the side plate of the tilt bracket. The lock cylinder is pressed with the tilt shaft as a support, and the column bracket is held by applying a tightening force to the side plate of the tilt bracket to lock the tilt angle of the steering column. The tilt angle locking means including the lock shaft and the tilt lever can be compactly configured in an appropriate form around the steering column.
[0015]
A tilt steering device according to a second aspect of the present invention is such that a column bracket fixed to a steering column is fitted between a pair of side plates of a tilt bracket fixed to a vehicle body, and is inserted into tilt holes formed in these side plates. The tilt shaft supporting the column bracket is inserted, and the tilt angle of the steering column, which is changed by the movement of the tilt shaft along the tilt hole, is tightened to the side plate of the tilt bracket via the tilt shaft. In the tilt steering device that locks by this, a lock cylinder that is externally held by the protruding portion of the tilt shaft to the outside of the side plate and supported on one side by the outer surface of the side plate, and is rotatably supported by the lock cylinder A lock shaft that penetrates the tilt shaft in the radial direction, a part of the lock shaft, and a support portion for the lock cylinder and A lock cam that acts on the penetrating portion of the tilt shaft and urges the lock cylinder toward the side plate, and the rotation of the lock cam exceeds the rotation position at which the acting force on the lock cylinder and the tilt shaft is maximized. characterized Rukoto a stopper for restraining at position.
[0016]
In this invention, by rotating the lock shaft about the axis , the lock cam formed on a part of the lock shaft is fitted with the lock cylinder fitted on the protruding portion of the tilt shaft from the side plate of the tilt bracket. Press the tilt shaft as a support, apply clamping force to the side plate of the tilt bracket, hold the column bracket, and lock the tilt angle of the steering column. Further, when the rotation position of the lock cam exceeds the rotation position where the acting force on the lock cylinder and the tilt shaft is maximized, the rotation of the lock cam is restrained by the action of the lock cam itself, and a simple configuration is achieved. The locked state is securely maintained by the stopper .
[0017]
Further, in the tilt steering device according to the third invention of the present invention, the lock shaft in the first or second invention is moved to one side in the axial direction by the support groove formed on the end face of the lock cylinder, and the shaft It is immovably supported in the direction perpendicular to the longitudinal direction, characterized in Oh isosamples.
[0018]
In this invention, the lock shaft provided with the lock cam is supported by the support groove formed in the end surface of the lock cylinder with a semicircular cross section, and the lock shaft is assembled in the state where the lock cam is positioned in the penetrating portion of the tilt shaft. Is easily realized .
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 1 is a schematic diagram showing an overall configuration of a tilt steering apparatus according to the present invention.
[0020]
In the figure, reference numeral 1 denotes a steering column. The steering column 1 includes a column shaft 10 that is rotatably supported in a cylindrical column housing 11. A sensor housing 12 and a speed reducer housing 13 are coaxially connected to one side of the column housing 11, and the steering column 1 includes a tilt bracket 2 in the middle of the column housing 11 and a lower end of the speed reducer housing 13. The parts are supported by the lower bracket 3 as described later, and are attached to the interior of the vehicle compartment in an inclined posture in which the connecting side of the sensor housing 12 and the speed reducer housing 13 faces forward and downward (lower left in the figure). .
[0021]
A steering wheel 14 as a steering member is fitted and fixed to the upper end portion of the column shaft 10 that protrudes from the upper portion of the column housing 11 so as to face the driver in the vehicle interior. The protruding lower end of the column shaft 10 is connected to the steering mechanism 5 via an intermediate shaft 4 having universal joints 40, 40 at both ends. With the above configuration, the steering torque applied to the steering wheel 14 for steering is transmitted to the steering mechanism 5 via the column shaft 10 and the intermediate shaft 4, and steering is executed by the operation of the steering mechanism 5. .
[0022]
A torque sensor that detects a steering torque applied to the steering wheel 14 is configured inside the sensor housing 12, and a steering assisting device mounted outside the speed reducer housing 13 is provided inside the speed reducer housing 13. A speed reduction device that transmits the generated force of the motor 15 to the column shaft 10 is configured. The tilt steering device shown in FIG. 1 drives the steering assist motor 15 based on the torque detected by the torque sensor in the sensor housing 12. The motor 15 is configured as a column-assist type electric power steering device that transmits the rotational force of the motor 15 to the column shaft 10 via a reduction device inside the reduction gear housing 13 and assists the steering performed as described above.
[0023]
The characteristic configuration of the tilt steering device according to the present invention described below is applicable not only to the column assist type electric power steering device shown in FIG. 1 but also to other types of electric power steering devices, Furthermore, a manual type steering device that is steered only by a steering torque applied to the steering wheel 14 by a driver, and a hydraulic power steering device that assists steering by the generated force of a hydraulic cylinder attached to the steering mechanism 5. It goes without saying that is also applicable.
[0024]
The tilt steering apparatus according to the present invention is a steering wheel operated by a driver by a support structure shown below by a tilt bracket 2 that supports the upper part of the steering column 1 and a lower bracket 3 that supports the lower part of the steering column 1. Tilt adjustment for adjusting the tilt angle (tilt angle) of the steering column 1 is possible in order to change the position 14 according to the driving posture.
[0025]
A support bracket 30 is fixed to the lower end portion of the speed reducer housing 13 supported by the lower bracket 3, and the steering column 1 is supported by the lower bracket 3 as shown in FIG. 30 and these are connected by a support shaft 31 which is substantially parallel to the mounting surface on the vehicle body side and is substantially orthogonal to the axis of the steering column 1. With this support, the steering column 1 can swing in a plane substantially orthogonal to the mounting surface with the support shaft 31 as a pivot.
[0026]
FIG. 2 is an enlarged view of the vicinity of the support portion by the tilt bracket 2, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. As shown in FIG. 3, the tilt bracket 2 includes a flat substrate 20 and a pair of side plates 21, 21 that protrude from one surface of the substrate 20 and face each other in parallel with each other at an appropriate distance in the width direction. It has. The substrate 20 is fixed to the vehicle body via capsules 22 and 22 fitted in two places in the width direction so that the substrate 20 can be detached downward. At this time, the side plates 21 and 21 are suspended downward from the substrate 20 along the axial length direction of the tilt bracket 2 to be supported, and as shown in FIG. Tilt holes 23 and 23 are formed having an arc-shaped long hole shape centered at 31.
[0027]
As shown in FIG. 3, a column bracket 6 having a U-shaped cross section is fixed to the column housing 11 fixed to the tilt bracket 2 with the open side facing inward. The column bracket 6 includes side plates 62 and 62 that are opposed to each other with a width that can be fitted inside the side plates 21 and 21 of the tilt bracket 2. Shaft holes 63, 63 penetrating the substantially central portion are formed.
[0028]
Thus, the steering bracket 1 is supported by the tilt bracket 2 by inserting the column bracket 6 between the side plates 21 and 21 of the tilt bracket 2 and aligning the tilt shaft 7 with the tilt holes 23 and 23 and the shaft holes 63 and 63 aligned inside and outside. The column bracket 6 can be relatively moved between the side plates 21 and 21 of the tilt bracket 2 by moving the tilt shaft 7 using the tilt holes 23 and 23 as guides. Here, the tilt holes 23 and 23 are arc-shaped long holes with the support shaft 31 as the center, and when the tilt shaft 7 and the column bracket 6 are moved using the tilt holes 23 and 23 as a guide, steering is performed. The column 1 swings about the support shaft 31 as a pivot, and the tilt angle is changed.
[0029]
The steering column 1 after the tilt angle is changed in this way is locked by holding the column bracket 6 between the side plates 21 and 21 of the tilt bracket 2 and restraining the column bracket 6 so as not to move. The locking means for realizing such a locked state is configured in the protruding portion of the tilt shaft 7 to the outside of the side plate 21 on one side of the tilt bracket 2. The tilt shaft 7 protrudes to the outside of the other side plate 21 for an appropriate length, and a nut 70 for adjusting the length is screwed to a screw portion formed on the outer periphery of the protruding portion.
[0030]
The lock means includes a lock cylinder 8 fitted and held on the protruding portion of the tilt shaft 7, and a lock shaft 9 that penetrates the fitting portion of the lock cylinder 8 and the tilt shaft 7 in the radial direction. The lock shaft 9 is supported so as to be rotatable about the axis of the lock shaft 9.
[0031]
FIG. 4 is an exploded perspective view of the locking means. As shown in this figure, a cam having a thick rectangular flat plate is formed at the end of the tilt shaft 7 that protrudes through the tilt hole 23 provided in the side plate 21 outside the side plate 21 on one side of the tilt bracket 2. A plate 71 is continuously provided, and a cam hole 72 having a long hole shape extending in the axial length direction of the tilt shaft 7 is formed through the front and back of the cam plate 71.
[0032]
The lock cylinder 8 is a cylinder provided with seat portions 80 and 80 flattened to an appropriate width at two positions facing the radial direction of the outer peripheral surface. A fitting hole 81 having a rectangular cross section corresponding to the cam action portion 71 is formed through. Further, a support groove 82 having a semicircular cross section is formed on one end face of the lock cylinder 8 so as to cross in a direction substantially orthogonal to the seat portions 80, 80, and a support groove 82 is provided on the other end face. An engaging projection 83 having a rectangular cross section extending in the same direction as the projection is provided.
[0033]
The lock shaft 9 is a solid shaft having a circular cross section corresponding to the support groove 82, and an elliptical lock cam 90 is integrally formed coaxially in the vicinity of one end portion. Further, the other side of the lock shaft 9 is bent at a substantially right angle, and a tilt lever 91 is integrally formed.
[0034]
The lock means including the lock cylinder 8 and the lock shaft 9 as described above is formed on one end face of the lock cylinder 8 by fitting the lock cylinder 8 to the cam plate 71 connected to the end of the tilt shaft 7. The lock shaft 9 is inserted into the support grooves 82 and 82 and the cam hole 72 of the cam plate 71 aligned inside thereof, and the outer surface of the seat portion 80.80 of the lock cylinder 8 corresponds to the outer periphery of the lock shaft 9. The retaining rings 92 and 92 engaged with the portion are brought into contact with each other so that they cannot be moved in the axial direction.
[0035]
At this time, the other side of the lock cylinder 8 fitted on the cam plate 71 is in contact with the outer surface of the side plate 21 of the tilt bracket 2, and the engaging projection 83 protruding from the end surface of the same side is connected to the side plate 21. The lock cylinder 8 is engaged with the tilt hole 23, and the rotation around the axis of the lock cylinder 8 is restrained.
[0036]
The lock shaft 9 is attached by fitting both side portions of the lock cam 90 provided in the middle into the support grooves 82 and 82 of the lock cylinder 8, and positioning the lock cam 90 inside the cam hole 72 formed in the cam plate 71. Has been made. This positioning is easily realized by the above-described action of the retaining rings 92 and 92 that are engaged with the outer periphery of the lock shaft 9. At this time, as shown in FIGS. 2 and 3, the other side of the lock shaft 9 is suspended below the tilt shaft 7, and the tilt lever 91 bent at the same side is supported by the tilt bracket 2. At a position away from the column 1, it extends in a plane that is substantially parallel to the mounting surface on the vehicle body side.
[0037]
The lock shaft 9 thus mounted can rotate around the shaft under both-end support by the support grooves 82 and 82 of the lock cylinder 8, and the lock cam 90 is formed on the cam plate 71 by this rotation. The cam hole 72 rotates inside. Such rotation of the lock shaft 9 and the lock cam 90 is realized by gripping the tip of the tilt lever 91 and applying a pushing / pulling force in the axial direction of the steering column 1 within the extending surface of the tilt lever 91. The
[0038]
FIG. 5 is an explanatory diagram of the operation of the lock cam 90. As described above, the lock cam 90 is an elliptical cam formed coaxially in the middle portion of the lock shaft 9. The lock shaft 9 is supported by a support groove 82 provided at one end of the lock cylinder 8 indicated by a two-dot chain line in the figure, and rotates around the shaft. Then, it rotates in a cam hole 72 provided in a cam plate 71 inserted and supported by the lock cylinder 8.
[0039]
FIG. 5A shows a state in which the long axis of the lock cam 90 is oriented in the width direction of the cam hole 72. At this rotational position, the lock cam 90 is in a state where one side in the short axis direction is loosely in contact with the inner surface of the cam hole 72 and is locked between the support groove 82 that is in contact with the peripheral surface of the lock shaft 9 on the other side. The shaft 9 and the lock cam 90 are held. Such a contact is realized by rotating the nut 70 for adjusting the length on the other side of the tilt shaft 7 and increasing / decreasing the protruding length of the cam plate 71 from the side plate 21.
[0040]
FIG. 5B shows a state in which the lock shaft 9 is rotated in the direction indicated by the arrow, and the long axis of the lock cam 90 is directed in the longitudinal direction of the cam hole 72. At this time, the lock cam 90 is in a state in which one side in the long axis direction is in contact with the inner surface of the cam hole 72, and the lock cylinder 8 that supports the lock shaft 9 on the other side and the cam plate 71 in which the cam hole 72 is formed. Is relatively moved in the axial length direction by the half length of the difference between the long diameter and the short diameter of the lock cam 90.
[0041]
Here, the other side of the lock cylinder 8 is brought into contact with the outer surface of one side plate 21 of the tilt bracket 2, and the cam plate 71 is for adjusting the length screwed to the other end of the tilt shaft 7. Since the nut 70 is brought into contact with the outer surface of one side plate 21 of the tilt bracket 2, when the above-described relative movement between the cam plate 71 and the lock cylinder 8 occurs, the lock cylinder 8 comes into contact with one side plate 21. Inward pressing force is applied to the side plate 21 as shown by white arrows in FIG. 5B, and the same pressing force is applied to the other side plate 21. The column bracket 6 clamped between the side plates 21 and 21 is locked so as not to move.
[0042]
In the lock means configured as described above, after the tilt angle is changed as described above, the tilt angle can be locked by rotating the lock shaft 9 and the lock cam 90 about the axis. The rotation of the lock shaft 9 and the lock cam 90 is realized by swinging the tilt lever 91 integrally formed on the other side of the lock shaft 9 within the extending surface thereof. Here, as described above, the tilt lever 91 extends slightly below the steering column 1 so as to be substantially parallel to the mounting surface to the vehicle body. The space around the driver's legs can be secured in the lower position, so that the comfort of the interior of the vehicle interior can be kept good, and the deterioration of the driving operability can be prevented.
[0043]
Further, the lock shaft 9 can be appropriately extended along the outer surface of the side plate 21 of the tilt bracket 2, and as shown in FIGS. 2 and 3, the tilt shaft 7 and the lock shaft are positioned above the support portion of the steering column 1. It is possible to connect with the cylinder 8. Therefore, the tilt shaft 7 can be mounted horizontally above the steering column 1, and there is no need to extend the tilt bracket 2 and the column bracket 6 downward, so that the restriction on the driver's foot space is further eased.
[0044]
Furthermore, the lock shaft 9 can be arranged in an appropriate direction, not limited to the direction shown in FIG. 4, on the plane parallel to the side plate 21. The tilt lever 91 can be arranged in the steering column 1 and the steering column. It can be set freely within a range that does not cause interference with the peripheral portion of the column 1. Such an arrangement is such that the direction of the engaging projection 83 for positioning the lock cylinder 8 with respect to the side plate 21 is relative to the seat 80 and the support grooves 82 and 82 for determining the direction of the lock shaft 9 with respect to the lock cylinder 8. Can be easily realized.
[0045]
The lock strength by such a locking means becomes maximum when the lock cam 90 is at the rotational position shown in FIG. 5B, but the lock cam 90 at this rotational position can be easily moved in both directions by the action of a slight rotational force. There is a possibility that unnecessary unlocking may be performed by the action of external force such as vibration during traveling. On the other hand, when the lock cam 90 is located at the rotational position shown in FIG. 5C, that is, beyond the rotational position shown in FIG. 5B, the lock strength decreases, but the lock cam is directed by the broken arrow in the figure. The rotation of 90 is constrained, and the locked state can be maintained by stopping the rotation of the lock cam 90 in the direction indicated by the solid arrow.
[0046]
As shown in FIGS. 1 to 3, the locking cam 90 as described above is provided with a stopper projection 93 at an appropriate position on the lower surface of the steering column 1, and a tilt lever 91 is brought into contact with the stopper projection 93 from one side. This can be realized. The tilt lever 91 rotates the lock cam 90 by, for example, an upward operation, and is brought into contact with the stopper projection 93 at the rotational position shown in FIG. 5C, so that the locked state as described above is maintained. Such a locked state is released by applying a downward pressing force to the lock lever 91 and rotating the lock cam 90. This unlocking is performed in order to exceed the rotational position shown in FIG. Therefore, the possibility of unnecessary unlocking can be eliminated.
[0047]
The stopper protrusion 93 can be simply configured by joining a short bar to the outer surface of the steering column 1 by means of joining such as welding or screwing, and can be locked without requiring a complicated stopper. The state can be reliably maintained. The stopper projection 93 is not limited to the outer surface of the illustrated steering column 1, but may be provided on a part of the tilt bracket 2 or the column bracket 6, and may be provided on a part of the vehicle body.
[0048]
【The invention's effect】
As described above in detail, in the tilt steering apparatus according to the present invention, the locking means for locking the tilt angle obtained by the tilt adjustment can be configured compactly and simply around the steering column, so that the driver can The present invention has excellent effects such as securing sufficient space around the foot, keeping the comfort in the interior of the vehicle interior, and eliminating the possibility of deteriorating driving operability.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overall configuration of a tilt steering apparatus according to the present invention.
FIG. 2 is an enlarged view of the vicinity of a support portion by a tilt bracket.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is an exploded perspective view of the locking means.
FIG. 5 is an operation explanatory view of a lock cam.
[Explanation of symbols]
1 Steering column 2 Tilt bracket 6 Column bracket 7 Tilt shaft 8 Lock cylinder 9 Lock shaft
21 Side plate
23 Tilt hole
82 Support groove
90 Rock cam
93 Stopper protrusion (stopper)

Claims (3)

A column bracket fixed to the steering column is fitted between a pair of side plates of a tilt bracket fixed to the vehicle body, and a tilt shaft supporting the column bracket is inserted into a tilt hole formed in these side plates. A tilt steering device that locks a tilt angle of the steering column, which is changed by movement of the tilt shaft along the tilt hole, by tightening a side plate of the tilt bracket via the tilt shaft;
A lock cylinder that is externally fitted and held on the protrusion of the tilt shaft to the outside of the side plate, and is supported on one side by the outer surface of the side plate;
A lock shaft that is supported by the lock cylinder so as to be rotatable about its own axis, and that penetrates the tilt shaft in a radial direction;
A tilt lever connected to the other side of the lock shaft extending from the support to the lock cylinder and extending substantially perpendicular to the lock shaft;
The lock shaft is formed on a part of the lock shaft, and rotates around the axis of the lock shaft in response to a rotation operation within the extending surface of the tilt lever. A tilt steering device comprising: a lock cam that acts on a portion to urge the lock cylinder toward the side plate. A column bracket fixed to the steering column is fitted between a pair of side plates of a tilt bracket fixed to the vehicle body, and a tilt shaft supporting the column bracket is inserted into a tilt hole formed in these side plates. A tilt steering device that locks a tilt angle of the steering column, which is changed by movement of the tilt shaft along the tilt hole, by tightening a side plate of the tilt bracket via the tilt shaft;
A lock cylinder that is externally fitted and held on the protrusion of the tilt shaft to the outside of the side plate, and is supported on one side by the outer surface of the side plate;
A lock shaft rotatably supported by the lock cylinder and penetrating the tilt shaft in a radial direction;
A lock cam formed on a part of the lock shaft, acting on a support portion to the lock tube and a penetrating portion of the tilt shaft, and urging the lock tube toward the side plate;
A stopper for restraining the rotation of the lock cam at a rotation position exceeding a rotation position at which the acting force to the lock cylinder and the tilt shaft is maximized;
A tilt steering device comprising: The lock shaft is a support groove formed on the end face of the lock cylinder, the movement of the one side in the axial direction, and the first aspect or the axial length are then immovably supported in the direction perpendicular to the direction Item 3. The tilt steering device according to Item 2 .

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