JP5920582B2 - Steering device and manufacturing method thereof - Google Patents

Description

  The present invention relates to a steering device such as an electric power steering device, and a manufacturing method thereof.

  In a vehicle steering apparatus, as a method of fixing a bearing to a column tube configured to rotatably support a steering shaft by a bearing, for example, Patent Document 1 discloses that a stopper portion and a pressing portion are pressed on a predetermined portion of the column tube. A pre-molding step in which a portion is formed by pressure molding, a fitting step in which a predetermined amount of a bearing is inserted into the column tube, and a post-molding step in which a predetermined portion of the column tube is pushed inwardly to restrict axial movement of the bearing. A method for fixing the bearing to the column tube has been proposed. This method is intended to reduce manufacturing costs and increase bearing performance and durability.

JP-A-11-342853

  However, the inventor conducted a detailed study on the conventional method for fixing the bearing to the column tube. First, it has been found that the cost reduction effect is not yet sufficient. That is, in order to carry out the method described in Patent Document 1, at least a press hole formation (opening formation) step in the column tube, a side end portion of the bearing in the insertion direction of the bearing into the column tube (end portion in the insertion direction) ) In the opening portion, the step of forming the pressing portion for pressing the bearing inward in the diameter of the column tube, the step of fitting the bearing into the column tube, and the bearing It is necessary to execute a step of press-molding a portion that regulates the side end portion of the bearing in the direction opposite to the insertion direction into the column tube (the end portion in the opposite insertion direction) into the opening. As described above, since the number of processes is large, man-hours are extended and manufacturing costs are increased.

  Further, as described above, since the end portion on the side opposite to the insertion direction is press-molded after the bearing is inserted into the column tube, a press pressure (load) is applied to the bearing, which may cause damage or deformation of the bearing. is there. If this happens, so-called “garbage” or the like is generated in the bearing, and there is a concern that the steering feeling (feeling) of the steering by the user may deteriorate, or the specification conditions may not be satisfied.

  Furthermore, as is clear from the illustration in Patent Document 1, the opening (hole) formed in the column tube is shaped to form a portion that regulates the end portion on the insertion direction side and the end portion on the counter insertion direction of the bearing. However, since the complicated shape of the opening is punched out by a press, the manufacturing cost of the mold for that purpose becomes expensive, which may further increase the manufacturing cost. Also, in that case, the shape of the mold becomes relatively complicated, and the shape tends to change over time as it is repeatedly used for press work, so it takes time to maintain the mold and compare the molds. May need to be replaced frequently. As a result, the manufacturing cost may be further increased.

  Therefore, the present invention has been made in view of such circumstances, and it is possible to further reduce the manufacturing cost and improve the economic efficiency as compared with the prior art, and to suppress damage and deformation of the bearing. An object of the present invention is to provide a steering device and a manufacturing method thereof.

  In order to solve the above problems, a steering apparatus according to the present invention includes a steering wheel, a steering shaft fixed to the steering wheel, a column tube through which the steering shaft is inserted, and a column so as to rotatably support the steering shaft. And a bearing disposed in the tube. The column tube has an annular convex portion that is annularly projecting radially inward on the peripheral wall of the column tube, and a radial tightening portion that tightens the bearing radially inward, and a bearing An opening formed in the annular protrusion so as to engage with, and an axial holding portion for holding the bearing by restricting the movement of the bearing in the axial direction of the column tube, and The bearings are inserted into portions of the column tube where the radial tightening portions and the axial holding portions are formed.

  In the steering apparatus configured as described above, the bearing inserted into the column tube is pressed and tightened radially inward of the column tube by the radial tightening portion, and formed in the axial holding portion. The column tube is restricted from moving in the axial direction by engaging with the opening, and is held by the column tube, and in this state, the steering shaft is rotatably supported. Such a structure occurs when a radial fastening portion and an axial holding portion are formed on the column tube, and then a bearing is inserted into the portion. Therefore, the step of further press-molding the column tube after the bearing is fitted into the column tube as in the method described in Patent Document 1 can be omitted, and the man-hours can be extended and the manufacturing cost can be reduced.

  In addition, since the column tube does not need to be pressed after the bearing is inserted in this way, no pressing pressure (load) is applied to the bearing, resulting in damage or deformation of the bearing. Etc.

  Furthermore, the radial tightening portion can be formed only by extremely simple press molding in which the circumferential wall (outer wall) of the column tube is annularly pressed radially inward to form the annular convex portion. On the other hand, although it is necessary to make an opening for forming the axial holding portion, the opening shape may be a simple shape with which the bearing is engaged, and only the processing accuracy of the dimension needs to be managed. Even in the case where the opening is formed by punching with a press using a mold, the production cost of the mold can be further reduced. Moreover, since the axial holding portion is formed using an annular convex portion that substantially functions as a radial tightening portion, the number of man-hours can be further reduced.

  Furthermore, only the opening is formed in the axial holding portion (that is, unnecessary bending or the like is unnecessary), and the shape thereof is the end portion on the bearing insertion side described in Patent Document 1 and Since it is not a complicated shape like the part that regulates the end portion in the counter-insertion direction, the opening formation can be replaced by, for example, laser processing instead of punching by press. In this way, there is an advantage that a press punching die itself is unnecessary.

  Further, the manufacturing method of the steering device according to the present invention is a method for effectively manufacturing the above-described steering device of the present invention, and includes an annular convex portion projecting annularly toward the radially inner side of the column tube, As a radial tightening part for tightening the bearing radially inward, a step of forming in the peripheral wall of the column tube, and an opening that engages with the bearing is formed in the annular convex part, thereby the axial direction of the column tube A step of forming an axial holding portion for holding the bearing by restricting the movement of the bearing in the column, and a step of inserting the bearing into a portion of the column tube where the radial tightening portion and the axial holding portion are formed. . At this time, as described above, it is preferable to form the opening in the axial holding portion by laser processing.

  According to the present invention, the radial tightening portion and the axial holding portion are formed on the column tube into which the bearing is inserted, and after the radial tightening portion and the axial holding portion are formed on the column tube, Since the steering device can be easily obtained by inserting the bearing into the part, it is possible to improve the economy by reducing the manufacturing cost and to suppress the damage and deformation of the bearing. Become. Even when a mold is used when forming the axial holding portion, the manufacturing cost and maintenance management cost including replacement can be reduced, or the mold need not be used. Cost reduction can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view (partially sectional view) schematically showing an overall configuration of a preferred embodiment (electric power steering device) according to a steering device according to the present invention. FIG. 2 is an enlarged view (partial cross-sectional view) showing a partial configuration of the electric power steering apparatus shown in FIG. 1. (A) and (B) are respectively a plan view and a side view (a cross-sectional view taken along line BB in (A)) showing a state in which a bearing is inserted into a column tube in the electric power steering apparatus shown in FIG. is there. (A) And (B) is the front view and side view (BB sectional drawing in (A)) of the straight pipe which are the raw material pipes of the outer column of a column tube, respectively. (A) thru | or (C) is a front view which shows the state after pressing the straight pipe shown to FIG. 4 (A) and (B), respectively, and a side view (BB line in (A)) It is sectional drawing) and a bottom view. FIGS. 5A to 5C are a front view and a side view (BB in FIG. 5A) schematically showing a state after an opening is formed in the straight pipe shown in FIGS. (Line sectional view), top view, and bottom view. (A) thru | or (C) are the front views which show the state after inserting a bearing in the outer column of a column tube, respectively, a side view (BB sectional view in (A)), and a lower surface, respectively. FIG.

  Hereinafter, embodiments of the present invention will be described in detail. The positional relationship such as up, down, left, and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios. Furthermore, the following embodiment is an illustration for explaining the present invention, and is not intended to limit the present invention only to the embodiment. Furthermore, the present invention can be variously modified without departing from the gist thereof.

  FIG. 1 is a front view (partially sectional view) schematically showing an overall configuration of a preferred embodiment of a steering apparatus according to the present invention. In the electric power steering apparatus 1, a steering shaft 12 having a steering wheel 11 fixed to the rear side of the vehicle body (right side in FIG. 1) is inserted into a tubular column tube 13; An assist device 20 for applying auxiliary torque to the steering shaft 12 and a steering gear 30 connected to the front side of the vehicle body of the steering shaft 12 (on the left side in FIG. 1) via a rack / pinion mechanism (not shown). ing.

  The center portion of the steering wheel 11 is fixed to one end portion of the steering shaft 12. For example, by providing a known tilt mechanism or telescopic (nesting) mechanism (not shown), the height direction of the steering wheel 11 (arrow Ya shown in the drawing). , Yb) and the vehicle body longitudinal direction (direction shown by the arrow Yc in the drawing and the opposite direction) are adjustable.

  The steering shaft 12 is formed by combining an outer shaft 12A and an inner shaft 12B so that rotational force can be transmitted and relative displacement in the axial direction can be achieved by, for example, coupling via spline engagement and synthetic resin. As a result, when an impact is applied in the axial direction due to a vehicle collision or the like, the outer shaft 12A and the inner shaft 12B break at the portion of the synthetic resin that couples them, and as a result, the overall length of the steering shaft 12 is reduced. It is configured to

  Further, the column tube 13 through which the steering shaft 12 is inserted is configured such that the outer column 13A and the inner column 13B are movably combined in a telescopic manner (nested shape). When an impact is applied, the entire length is reduced while absorbing energy from the impact. That is, the column tube 13 has a so-called collapsible structure.

  The inner column 13 </ b> B of the column tube 13 has a vehicle body front side end portion coupled and fixed to a vehicle body rear side end surface of the gear housing 21. On the other hand, the inner shaft 12B of the steering shaft 12 passes through the inside of the gear housing 21 at the front end of the vehicle body, and a worm wheel (not shown) provided inside the assist device 20 (a worm that is rotationally driven by an actuator or the like). For transmitting the rotation to the steering shaft 12).

  Further, the column tube 13 is supported by a support bracket 14 at a middle portion of the column tube 13 on a part of the vehicle body 18 (for example, a lower surface of a dashboard inside the vehicle). Further, a locking portion (not shown) is provided between the support bracket 14 and the vehicle body 18, and when an impact in the direction toward the front side of the vehicle body is applied to the support bracket 14, for example, the support bracket 14 is engaged with the engagement. It is configured to move away from the stop and move forward of the vehicle body. Similarly, the upper end portion of the gear housing 21 is also supported by a part of the vehicle body 18.

  The output shaft 19 provided at the vehicle body front end of the inner shaft 12B and arranged to protrude from the vehicle front end surface of the gear housing 21 is connected to the intermediate shaft 16 via the universal joint 15. Is connected to the rear end of the vehicle. An input shaft 31 of the steering gear 30 is connected to the vehicle front side end portion of the intermediate shaft 16 via another universal joint 17. For example, a pinion (not shown) is coupled to the input shaft 31, and a rack (not shown) fitted in the steering gear 30 so as to be reciprocally slidable is engaged with the pinion. With this structure, the rotation of the steering wheel 11 moves the tie rod 32, and the wheels (not shown) of the vehicle are steered. Further, the universal joints 15 and 17 can be provided with vibration absorbers for preventing vibration applied to the intermediate shaft 16 from the ground via the wheels from being transmitted to the steering wheel 11.

  Further, the assist device 20 is provided with a stator made of permanent magnets installed in a case 291 fixed to the gear housing 21 and an electric motor 29 including a rotor provided on the output shaft and disposed opposite to the stator. It has been. The electric motor 29 has a predetermined magnitude in a predetermined direction based on the direction and magnitude of the torque applied from the steering wheel 11 to the inner shaft 12B detected by a torque sensor (not shown) installed on the inner shaft 12B. Is configured to generate auxiliary torque.

  Here, FIG. 2 is an enlarged view (partial cross-sectional view) showing a partial configuration of the electric power steering apparatus 1 shown in FIG. In FIG. 2, illustration of “radial tightening portions” and “axial holding portions”, which will be described later, formed on the outer column 13 </ b> A of the column tube 13 is omitted. As shown in the figure, a bearing 40 in which a plurality of balls 43 are rotatably held between an inner race 41 and an outer race 42 is inserted into the rear end of the outer column 13A of the column tube 13 in the vehicle body. It is fitted. The outer shaft 12A of the steering shaft 12 is fixed by being inserted through the inner race 41 of the bearing 40, so that the bearing 40 rotatably supports the steering shaft 12. Thus, the steering shaft 12, the bearing 40, and the column tube 13 are coaxially disposed along the axial direction G of the column tube 13.

  3A and 3B are a plan view and a side view, respectively, showing a state in which the bearing 40 is inserted into the column tube 13 in the electric power steering apparatus 1 shown in FIG. 3A corresponds to a top view viewed from the vehicle body rear side end side in the axial direction G of FIG. 2, and is also an AA arrow view in FIG. 3B, and FIG. B) is also a cross-sectional view taken along line BB in FIG.

  As shown in FIGS. 3A and 3B, a radial tightening portion 61 and an axial holding portion 62 are formed on the peripheral wall 131 of the outer column 13 </ b> A of the column tube 13. Among these, the radial tightening portion 61 is formed so that a part of the peripheral wall 131 of the outer column 13A protrudes in an annular shape toward the radially inner side of the outer column 13A, as will be described later (see from the radially outer side). The annular protrusion 61a is in contact with the outer wall surface 42a of the outer race 42 of the bearing 40 and tightens the bearing 40 radially inward continuously in the circumferential direction. To function.

  The axial holding portion 62 has an opening 622 formed in a part of the top of the annular convex portion that is the radial tightening portion 61. The opening 622 is engaged with the bearing 40, so that the bearing 40 is placed inside the axial direction holding portion 52 of the column tube 13 so that the movement of the bearing 40 in the axial direction G of the column tube 13 is restricted. Retained. That is, the axial holding portion 62 is configured by a portion where the opening 622 is formed in the annular convex portion that is the radial tightening portion 61 (the convex portion 621 near the periphery of the opening 622) and the opening 622.

  More specifically, the inner edge 622u of the opening 622 of the axial direction holding portion 62 (the front edge on the paper surface in FIG. 3A, the left edge in FIG. 3B; that is, the edge edge on the rear side of the vehicle body), The outer race 42 of the bearing 40 is in contact with the rear end surface 42u of the vehicle body, and the inner edge 622s of the opening 622 (the rear end of the paper surface in FIG. 3A, the right end in FIG. 3B); The front edge of the outer race 42 of the bearing 40 is in contact with the front end surface 42s of the vehicle body.

  In this manner, the outer race 42 of the bearing 40 is fitted and fixed to the opening 622 of the axial holding portion 62, and the radially inward tightening (pressing) by the radial tightening portion 61 described above is performed. Together, the bearing 40 is inserted into the portion of the outer column 13A of the column tube 13 where the radial tightening portion 61 and the axial holding portion 62 are formed.

  4 (A) and (B), FIGS. 5 (A) to (C), and FIGS. 6 (A) to (C) with respect to a part of an example of a procedure for manufacturing the electric steering device 1 configured as described above. The following description will be made with reference to FIGS. 7A to 7C. Here, the procedure until the column tube 13 is processed and the bearing 40 is inserted into the column tube 13, that is, the procedure until the state shown in FIGS. 3A and 3B occurs will be described in detail.

  First, a straight pipe that is a raw material pipe of the outer column 13A of the column tube 13 is prepared. 4A and 4B are respectively a front view and a side view of the straight pipe (a cross-sectional view taken along the line BB in FIG. 4A). For convenience of explanation, the straight pipe and the column tube are also shown. 13 and the outer column 13A. As the straight pipe 13A (13), a pipe whose inner diameter is slightly larger than the outer diameter of the bearing 40 is used.

  Next, the straight pipe 13A is subjected to pressure molding by annular press working to form the above-described radial tightening portion 61 and a prototype portion that will later become the axial holding portion 62, that is, an annular convex portion. As described above, in the present embodiment, the annular convex portion substantially functions as the radial tightening portion 61. Therefore, the annular convex portion formed in the manufacturing process also has the same symbol as the radial tightening portion 61. Is given in parentheses. 5A to 5C are respectively a front view, a side view (a cross-sectional view taken along line BB in FIG. 5A), and a bottom surface schematically showing a state after the straight pipe 13A is pressed. FIG. As shown in the figure, an annular convex portion (61) (outer annular concave portion) that is a radial tightening portion 61 and is also a prototype portion of the axial holding portion 62 is formed continuously in the circumferential direction. Next, the outer wall is pressed radially inward along the outer periphery of the position where the bearing 40 in the straight pipe 13A is inserted.

  In the present embodiment, the body of the outer race 42 of the bearing 40 is secured to the inner edge 622u, 622s of the opening 622 of the axial holding portion 62 to be formed later in order to secure a margin for tightening the bearing 40 by the radial tightening portion 61. The height of the protruding portion 61a of the radial tightening portion 61 (annular convex portion (61)) is such that the rear end surface 42u and the vehicle body front side end surface 42s are engaged with each other. The distance from the inner wall surface of the tube 13A (that is, the tightening inner diameter of the bearing 40) is set to be smaller than the outer diameter dimension of the bearing 40. On the other hand, the width (groove width as viewed from the outside) of the radial tightening portion 61 (annular convex portion (61)) is set to a dimension capable of forming the opening 622 of the axial holding portion 62.

  Furthermore, the annular convex portion 61 is formed in the straight pipe 13A at the same time as or after the annular convex portion (61) which is the prototype portion of the axial holding portion 62 is formed. The opening 622 is formed by punching a part of the top of the part 62 into a predetermined shape, for example, by pressing, or by cutting with a laser. 6A to 6C are a front view and a side view schematically showing a state after the opening 622 is formed in the straight pipe 13A, respectively (a sectional view taken along line BB in FIG. 6A), FIG. In the present embodiment, the opening 622 has a substantially rectangular shape, and the distance between the inner edge ends 622u and 622s is the height (width) of the bearing 40, that is, the vehicle body rear side end face 42u of the outer race 42 of the bearing 40. It is equal to or slightly larger than the length between the front end surface 42s of the vehicle body. In this manner, the axial holding portion 62 is formed by drilling the opening 622 in the annular convex portion (61) which is also the prototype portion of the axial holding portion 62 shown in FIGS. 5 (A) to (C). An outer column 13A of the tube 13 is obtained.

  Then, a bearing prepared separately from the open end 13H on the side where the radial tightening portion 61 and the axial holding portion 62 of the outer column 13A of the column tube 13 in the state shown in FIGS. 6 (A) to 6 (C) are formed. 40 is press-fitted, and the bearing 40 is inserted into a portion where the radial tightening portion 61 and the axial holding portion 62 are formed. 7A to 7C are a front view and a side view (BB in FIG. 7A) schematically showing a state after the bearing 40 is inserted into the outer column 13A of the column tube 13, respectively. It is a sectional view of the line) and a bottom view.

  During the press-fitting of the bearing 40, the end surface 42s of the outer race 42 of the outer race 42 in the bearing 40 radially extends the top of the annular convex portion 61 projecting radially inward and the inner edge 622u of the opening 622. The outer edge 13A gradually enters the outer column 13A while pressing outward (the inner edge 622u is elastically deformed). When the vehicle body front side end surface 42s of the outer race 42 reaches and contacts the other inner edge 622s of the opening 622, and the inner edge 622u of the pressed opening 622 returns radially inward, the outer race 42 The rear end surface 42u of the vehicle body 42 contacts the inner edge 622u of the opening 622, and the outer race 42 engages with the opening 622. At the same time, the outer wall surface 42a of the outer race 42 abuts against the protruding end portion 61a of the radial tightening portion 61 (the protruding end portion 61a and its peripheral portion are elastically deformed), whereby the bearing 40 is placed in the outer column 13A. Fit. In this state, the bearing 40 is tightened inward in the radial direction, and movement of the column tube 13 in the axial direction G is restricted.

  According to the electric power steering device 1 configured as described above and the manufacturing method thereof, after the radial tightening portion 61 and the axial holding portion 62 are formed on the outer column 13A of the column tube 13, the bearing 40 is provided at that portion. Therefore, the number of processes can be reduced as compared with the conventional steering apparatus and the manufacturing method thereof that require a process of further press-molding the column tube 13 after the bearing 40 is inserted into the column tube 13. As a result, man-hours can be extended and manufacturing costs can be reduced.

  In addition, since the electric power steering apparatus 1 has a structure that does not require pressing of the column tube 13 after the bearing 40 is inserted, there is no possibility that a pressing pressure (load) is applied to the bearing 40. Thereby, it is possible to prevent the bearing 40 from being damaged or deformed.

  Further, the radial tightening portion 61 can be formed only by extremely simple press molding that annularly presses a part of the peripheral wall 131 of the outer column 13A in the column tube 13 toward the radially inner side. On the other hand, although it is necessary to drill the opening 622 to form the axial holding portion 62, the opening shape may be a simple shape with which the bearing 40 is engaged, and only the processing accuracy of the dimension is managed. Therefore, even when the opening is formed by punching with a press using a mold, the manufacturing cost of the mold can be further reduced. Moreover, since the axial holding portion 62 can be formed by using the annular convex portion (61) that substantially functions as the radial tightening portion 61, the convex portion 621 of the axial holding portion 62 is separately formed. This eliminates the need for processing, and further reduces man-hours. As a result, the manufacturing cost of the electric power steering apparatus 1 can be further reduced, and the economy can be further improved.

  Furthermore, all that is required to form the axial holding portion 62 is the formation of the opening 622, which does not require complicated bending as in the prior art described in Patent Document 1 and the like, and its shape. Since the structure itself is simple, the opening can be replaced by, for example, laser processing as described above, instead of punching by press. Therefore, in that case, the press punching die itself is not necessary, so that the manufacturing cost of the electric power steering apparatus 1 can be further reduced and the economy can be further improved.

  Furthermore, the inner edge ends 622u and 622s of the opening 622 in the axial holding portion 62 and the vehicle body rear side end surface 42u and the vehicle body front side end surface 42s of the outer race 42 in the bearing 40 are circumferential directions of the outer column 13A of the column tube 13. , The bearing 40 is less likely to come off from the outer column 13A as compared with a case where the two engage with each other in a “dot” shape, for example. There are advantages.

  In addition, as above-mentioned, this invention is not limited to said embodiment, A various deformation | transformation is possible in the limit which does not change the summary. For example, the number of the axial holding portions 62 formed on the outer tube 13A of the column tube 13 is not limited to one as illustrated, and a plurality of axial holding portions 62 may be formed. In addition, the radial tightening portion 61 (annular convex portion (61)) may not have a smooth curved shape (a shape having a certain curvature) before the insertion of the bearing 40, but may be provided protruding. If the function of the radial direction fastening part 61 is expressed, for example, an appropriate shape whose cross section is partially linear can be employed. Further, the overall configuration of the steering device is not limited to the configuration exemplified as the electric power steering device 1.

  As described above, the steering device and the manufacturing method thereof according to the present invention can improve the economy by reducing the manufacturing cost and can suppress the damage and deformation of the bearing. For example, it can be used widely and effectively for general vehicles and their manufacture.

1 Electric power steering device (steering device)
11 Steering wheel 12 Steering shaft 12A Outer shaft 12B Inner shaft 13 Column tube 13A Outer column, straight tube 13B Inner column 13H Outer column open end 131 Outer column peripheral wall 14 Support brackets 15, 17 Universal joint 16 Intermediate shaft 18 Car body 19 Output Shaft 20 Assist device 21 Gear housing 29 Electric motor 291 Case 30 Steering gear 31 Input shaft 32 Tie rod 40 Bearing 41 Inner race 42 Outer race 42a Outer race outer wall surface 42u Outer race vehicle rear side end surface 42s Outer race vehicle front side end surface 43 Ball 61 Radial tightening portion, annular convex portion 61a Radial tightening portion protruding end 62 Axial holding portion 621 Axial holding portion convex portion 622 Axis Direction holding portion of the opening 622U, axial inner end G column tube of 622s opening

Claims (3)

A steering wheel,
A steering shaft fixed to the steering wheel;
A column tube through which the steering shaft is inserted;
A bearing disposed in the column tube to rotatably support the steering shaft;
With
The column tube is
A radial tightening portion for annularly projecting radially inward in the peripheral wall of the column tube, and tightening the bearing inward in the radial direction;
An axial holding portion that has an opening formed in the annular convex portion so as to engage with the bearing, and holds the bearing by restricting movement of the bearing in the axial direction of the column tube;
Have
The bearing is inserted into a portion of the column tube where the radial tightening portion and the axial holding portion are formed.
Steering device. A steering wheel, a steering shaft fixed to the steering wheel, a column tube through which the steering shaft is inserted, and a method of manufacturing a steering device including a bearing fitted to the column tube and rotatably supporting the steering shaft Because
Forming an annular protrusion projecting annularly toward the radially inner side of the column tube as a radial tightening portion for tightening the bearing toward the radially inner side on the peripheral wall of the column tube;
Forming an axial holding portion for holding the bearing by restricting movement of the bearing in the axial direction of the column tube by drilling an opening that engages with the bearing in the annular convex portion;
Inserting the bearing into the portion where the radial tightening portion and the axial holding portion are formed in the column tube;
Manufacturing method of steering apparatus having In the step of forming the axial holding portion, the opening is formed by laser processing.
A method for manufacturing a steering device according to claim 2.

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