JP2007246055A - Steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steering device, reducing the time required for coupling a male shaft and a female shaft, and lowering the machining equipment cost for coupling and the tool cost. <P>SOLUTION: When an input shaft 22 is externally fitted to an inner shaft 12B, the end face at the car body rear side of an annular projection 223 of the input shaft 22 is abutted on an inclined abutting surface 1241B of the inner shaft 12B. When the input shaft 22 is further pushed in the input shaft 22 in this state, the annular projection 223 is bent along the inclination of the inclined abutting surface 1241B toward the axis of the inner shaft 12B, and pressed to the inclined locking surface 1232B of the inner shaft 12B. Accordingly, only by the machining operation of pushing the input shaft 22 into the inner shaft 12B, the annular projection 223 of the input shaft 22 bites into the inclined locking surface 1232B of the inner shaft 12B, thereby fixing the axial position of the input shaft 22 and the inner shaft 12B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a steering device, and more particularly to a steering device having a coupling portion between an upper side steering shaft and a lower side steering shaft that transmits the rotation of the upper side steering shaft to a steering gear side.

  In a joint portion of a shaft such as a vehicle steering device or a power transmission shaft, it is necessary to couple a male shaft and a female shaft that are coupled to each other so that rotational torque can be transmitted and relative movement in the axial direction cannot be performed. .

  There exists a manufacturing method of the propeller shaft of patent documents 1 as what has such a joint structure. FIG. 6 shows a propeller shaft of Patent Document 1, and is a longitudinal sectional view showing a main part of a joint portion of the shaft. As shown in FIG. 6, a universal joint yoke 4 is coupled to a propeller shaft pipe 5. A male serration 41 is provided on the outer peripheral surface of the yoke 4 at the end on the coupling portion side. Further, a caulking groove 42 is formed adjacent to the male serration 41 on the side opposite to the coupling portion with the male serration 41 interposed therebetween.

  A constricted portion 51 whose diameter is contracted is provided at the end of the pipe 5 on the side of the connecting portion by a sharpening process. The inner diameter of the contraction portion 51 is smaller than the outer diameter of the outer peripheral surface of the joint portion side end portion of the yoke 4, and the pipe diameter is adjusted until the inner diameter is such that residual compressive stress remains even after being expanded by a subsequent press-fitting step. It is shrinking. Further, a female serration 52 is formed on the inner surface of the end portion on the coupling portion side of the pipe 5, and the female serration 52 is fitted on the male serration 41 formed on the outer peripheral surface of the end portion on the coupling portion side of the yoke 4. Yes.

  The joint 4 side end of the yoke 4 processed in this way is press-fitted into the contraction 51 of the joint 5 side end of the pipe 5. By this press-fitting, the contraction portion 51 is expanded by the coupling portion side end portion of the yoke 4, and the outer peripheral surface of the coupling portion side end portion of the yoke 4 is strongly tightened. Further, the crimped portion 53 is formed by crimping by a roller, a press, swaging, or the like so that the tip of the pipe 5 is fitted in the crimping groove 42 of the yoke 4.

  According to the method for manufacturing a propeller shaft of Patent Document 1, since welding is not used, there is no problem such as deformation due to thermal stress, and there is no restriction on material selection. However, in the manufacturing method of Patent Document 1, two steps of a press-fitting step and a caulking step are required to join the male shaft and the female shaft, so that the processing equipment cost and the tool cost increase, and the processing time also increases. There was a problem.

Japanese Unexamined Patent Publication No. 7-19234

  The present invention shortens the coupling time of the upper side steering shaft and the lower side steering shaft, or the male shaft and the female shaft at any location constituting the steering device, and reduces the cost of processing equipment and tools for coupling. It is an object of the present invention to provide a possible steering device.

  The above problem is solved by the following means. That is, the first invention includes a male shaft that constitutes a steering device, a female shaft that has an inner diameter hole that fits around the outer periphery of the coupling portion side of the male shaft, and that transmits the rotation of the male shaft. An annular protrusion formed on the outer periphery of the end of one of the male shaft and the female shaft on the coupling portion side, formed on the other anti-coupling portion side of the male shaft or the female shaft, and the female shaft on the male shaft Is formed in the vicinity of the inclined contact surface on the side opposite to the other coupling portion of either the male shaft or the female shaft. A steering device having a locking surface to which the annular projection is pressed.

  According to a second aspect of the present invention, there is provided a male shaft that constitutes a steering device, a female shaft that has an inner diameter hole that fits around an outer periphery of an end portion on the coupling portion side of the male shaft, and the rotation of the male shaft is transmitted. An annular protrusion formed on the outer periphery of the end of the coupling portion, and an outer periphery of the male shaft on the side opposite to the coupling portion. When the female shaft is fitted on the male shaft, the annular protrusion of the female shaft An inclined contact surface that bends the annular protrusion to the axial center side of the male shaft, and is formed in the vicinity of the inclined contact surface on the outer periphery of the male shaft on the side opposite to the coupling portion, and the bent annular protrusion is press-contacted A steering apparatus having an inclined locking surface.

  A third invention is a male shaft that constitutes a steering device, a female shaft that has an inner diameter hole that fits around an outer periphery of an end portion on the coupling portion side of the male shaft, and that transmits the rotation of the male shaft, and the male shaft Formed on the annular protrusion formed on the outer periphery of the end of the coupling part, the inclined contact surface formed on the inner periphery of the end of the annular protrusion on the coupling part side, the inner diameter hole on the side opposite to the coupling part of the female shaft, When the female shaft is externally fitted to the male shaft, the inclined contact surface of the male shaft comes into contact, and the hole bottom that bends the annular protrusion away from the axis of the male shaft, the side opposite to the coupling portion of the female shaft A steering device comprising an annular groove formed in the vicinity of the bottom of the inner diameter hole and to which the bent annular protrusion is pressed.

  A fourth invention is a male shaft that constitutes a steering device, a female shaft that has an inner diameter hole that fits around an outer periphery of an end portion on the coupling portion side of the male shaft, and that transmits the rotation of the male shaft, and the male shaft An annular projection formed on the outer periphery of the end of the coupling portion, and is inserted into the inner diameter hole of the female shaft, has an outer diameter larger than the inner circumference of the annular projection, and the female shaft is attached to the male shaft. When fitted, the inner periphery of the annular protrusion of the male shaft abuts, and a ball that bends the annular protrusion away from the axis of the male shaft is formed in the inner diameter hole on the side opposite to the coupling portion of the female shaft. A steering device comprising an inclined locking surface against which an annular projection is pressed.

  According to a fifth invention, in the steering device of any one of the first to fourth inventions, serrations are formed in either the inner diameter hole of the female shaft or the outer periphery of the male shaft, and the male shaft When the female shaft is externally fitted, the serration is press-fitted into either the inner diameter hole of the female shaft or the outer periphery of the male shaft.

  According to a sixth aspect of the present invention, in the steering device according to any one of the first to fourth aspects, the male serration formed on the outer periphery of the end on the coupling portion side of the male shaft, and the inner diameter hole of the female shaft A steering device comprising: a female serration formed and externally fitted to the male serration of the male shaft when the female shaft is externally fitted to the male shaft.

  According to a seventh invention, in the steering device according to any one of the first to fourth inventions, the male shaft is an upper side steering shaft, and the female shaft steers rotation of the upper side steering shaft. The steering device is a lower-side steering shaft that transmits to a gear.

  An eighth invention is characterized in that, in the steering device of the seventh invention, the lower side steering shaft is an input shaft of a steering assistance section for applying a steering assistance force proportional to the steering torque of the steering wheel. Steering apparatus.

  In the steering device of the present invention, an annular protrusion is formed on the outer periphery of the end of one of the male shaft and female shaft that are fitted to each other, and on the other anti-joint portion side of the male shaft or female shaft. When the female shaft is externally fitted to the male shaft, an inclined contact surface is formed so that the annular protrusion contacts and bends the annular protrusion, and the inclined contact surface on the other anti-coupling portion side of the male shaft or the female shaft is formed. In the vicinity, a locking surface is provided to which the bent annular projection is pressed.

  Therefore, the male shaft and the female shaft are fixed in the axial direction simply by fitting the female shaft to the male shaft, so that the time required for coupling the male shaft and the female shaft is shortened, and the processing equipment for the coupling is also provided. Costs and tool costs can be reduced.

  Embodiments 1 to 3 of the present invention will be described below with reference to the drawings.

  FIG. 1 shows the entire steering apparatus of Embodiment 1 of the present invention, which is a partially cut front view showing an embodiment applied to an electric power steering apparatus having a steering assisting portion. FIG. 2 is a longitudinal sectional view of the main part of FIG.

  As shown in FIGS. 1 to 2, the steering device of the present invention includes a steering shaft 12 on which a steering wheel 11 can be mounted on the rear side of the vehicle body (right side in FIGS. 1 and 2), and a steering through which the steering shaft 12 is inserted. A column 13, an assist device (steering assisting portion) 20 for applying auxiliary torque to the steering shaft 12, and a rack / pinion (not shown) on the front side of the vehicle body of the steering shaft 12 (left side in FIGS. 1 and 2) And a steering gear 30 connected through a mechanism.

  The steering shaft 12 is formed by combining an outer shaft 12A and an inner shaft (male shaft) 12B so that rotational force can be transmitted and relative displacement in the axial direction can be achieved by spline engagement. That is, a female spline 121A (see FIG. 2) is formed on the vehicle body front side of the outer shaft 12A, and a male spline 121B formed on the vehicle body rear side of the inner shaft 12B is in spline engagement. Therefore, when the outer shaft 12A and the inner shaft 12B collide, the spline engaging portion slides relative to each other so that the entire length can be shortened.

  Further, the cylindrical steering column 13 inserted through the steering shaft 12 combines the outer column 13A and the inner column 13B so that they can be telescopically moved. It has a so-called collapsible structure in which the entire length is shortened while absorbing water.

  The vehicle body front side end portion of the inner column 13B is press-fitted and fixed to the vehicle body rear side end portion of the gear housing 21. Further, the vehicle body front side end portion of the inner shaft (male shaft) 12B is passed through the inside of the gear housing 21, and is coupled to the vehicle body rear side end portion of the input shaft (female shaft) 22 of the assist device 20.

  The steering column 13 is supported by a support bracket 14 at a middle portion thereof on a part of the vehicle body 18 such as a lower surface of the dashboard. Further, a locking portion (not shown) is provided between the support bracket 14 and the vehicle body 18, and when an impact in a direction toward the front side of the vehicle body is applied to the support bracket 14, the support bracket 14 is locked to the locking bracket 14. It moves away from the vehicle and moves to the front side of the vehicle.

  The upper end portion of the gear housing 21 is also supported on a part of the vehicle body 18. In the case of this embodiment, by providing a tilt mechanism and a telescopic mechanism, the position of the steering wheel 11 in the longitudinal direction of the vehicle body and the height position can be freely adjusted. Such a tilt mechanism and a telescopic mechanism are well known in the art and are not characteristic features of the present invention, and thus detailed description thereof is omitted.

  The output shaft 23 protruding from the end face on the front side of the vehicle body of the gear housing 21 is connected to the rear end portion of the intermediate shaft 16 via the universal joint 15. Further, the input shaft 31 of the steering gear 30 is connected to the front end portion of the intermediate shaft 16 via another universal joint 17. A pinion (not shown) is formed at the front end of the input shaft 31. A rack (not shown) meshes with the pinion, and the rotation of the steering wheel 11 moves the tie rod 32 to steer a wheel (not shown).

  As shown in FIG. 2, an input shaft 22 and an output shaft 23 are rotatably supported by bearings 29A, 29B, and 29C on the same axis in the gear housing 21 of the assist device 20, and the input shaft 22 and the output shaft 23 are connected by a torsion bar 24. A worm wheel 25 is attached to the output shaft 23, and a worm 27 is engaged with the worm wheel 25. A case 261 of the electric motor 26 is fixed to the gear housing 21, and a worm 27 is coupled to a rotating shaft (not shown) of the electric motor 26.

  In addition, a torque sensor 28 that detects torsion of the torsion bar 24 is provided around an intermediate portion of the input shaft 22. The torque sensor 28 detects the direction and magnitude of torque applied from the steering wheel 11 to the steering shaft 12. In response to this detection signal, the electric motor 26 is driven, and an auxiliary torque is generated at a predetermined magnitude in a predetermined direction on the output shaft 23 via a speed reduction mechanism including a worm 27 and a worm wheel 25.

  FIG. 3 is a longitudinal sectional view of a main part of the coupling portion of the steering shaft according to the first embodiment of the present invention. The inner shaft (male shaft) 12B and the input shaft (female shaft) 22 of the assist device 20 are shown in FIG. An example applied to the coupling part is shown.

  As shown in FIG. 3 (1), a large-diameter shaft portion 122B is formed on the vehicle body front side (left side of FIG. 3 (1)) of the inner shaft 12B, and a small diameter is formed on the vehicle body front side of the large-diameter shaft portion 122B. A shaft portion 123B (an end portion on the coupling portion side) is formed. The small-diameter shaft portion 123B is coupled to an end portion on the coupling portion side formed on the vehicle body rear side (right side in FIG. 3 (1)) of the input shaft 22 of the assist device 20. A male serration 1231B is formed on the outer periphery of the small-diameter shaft portion 123B of the inner shaft 12B.

  Further, the step portion 124B between the small diameter shaft portion 123B and the large diameter shaft portion 122B is formed on a plane perpendicular to the axis of the inner shaft 12B, with the outer periphery of the large diameter shaft portion 122B being close to the outer periphery. An annular inclined contact surface 1241B is formed on the radially inner side of the stepped portion 124B. The inclined contact surface 1241B is inclined toward the rear side of the vehicle body by an angle θ1 with respect to the stepped portion 124B (a plane perpendicular to the axis of the inner shaft 12B).

  Further, an annular inclined locking surface 1232B as a locking surface is formed on the outer periphery of the small-diameter shaft portion 123B in the vicinity of the joining position with the stepped portion 124B. The inclined locking surface 1232B is inclined to the rear side of the vehicle body by an angle θ2 larger than the angle θ1 with respect to the stepped portion 124B (a plane perpendicular to the axis of the inner shaft 12B). Therefore, the inclined locking surface 1232B is formed so that the vicinity of the joining position with the stepped portion 124B has a small diameter from the front side of the vehicle body toward the rear side of the vehicle body. The inclined locking surface 1232B and the inclined contact surface 1241B form a substantially V-shaped annular groove whose groove width decreases toward the rear side of the vehicle body.

  An inner diameter hole 221 is formed on the inner periphery of the coupling shaft side end of the input shaft 22 so as to be fitted to the male serration 1231B of the inner shaft 12B. The inner diameter hole 221 is a female engaging with the male serration 1231B of the inner shaft 12B. A serration 222 is formed.

  An annular protrusion 223 is formed at the rear end of the vehicle body on the coupling portion side of the input shaft 22 (on the right side of FIG. 3A). The inner diameter of the annular protrusion 223 is formed in a cylindrical shape having a diameter larger than the outer diameter of the inclined locking surface 1232B and smaller than the outer diameter of the inclined contact surface 1241B.

  When the female serration 222 of the input shaft 22 is externally fitted to the male serration 1231B of the inner shaft 12B, the vehicle body rear side end surface of the annular protrusion 223 of the input shaft 22 contacts the inclined contact surface 1241B of the inner shaft 12B. When the input shaft 22 is further pushed into the inner shaft 12B from this state, the annular protrusion 223 is bent toward the axial center side of the inner shaft 12B along the inclination of the inclined contact surface 1241B, and the inclined locking surface of the inner shaft 12B. It is pressed against 1232B (see FIG. 3 (2)).

  Accordingly, with the machining operation that simply pushes the input shaft 22 into the inner shaft 12B, the annular protrusion 223 of the input shaft 22 bites into the inclined locking surface 1232B of the inner shaft 12B, and the axial positions of the input shaft 22 and the inner shaft 12B are changed. Fixed. Therefore, the coupling time between the inner shaft 12B and the input shaft 22 is shortened, and it becomes possible to reduce processing equipment costs and tool costs.

  Next, a second embodiment of the present invention will be described. FIG. 4 is a longitudinal sectional view showing a main part of the coupling portion of the steering shaft according to the second embodiment of the present invention. In the following description, only structural portions and operations different from the above embodiment will be described, and redundant description will be omitted. Further, the same parts as those in the above embodiment will be described with the same numbers.

  In the first embodiment, the annular protrusion 223 is formed on the input shaft 22 side, but the second embodiment is an example in which the annular protrusion is formed on the inner shaft 12B side.

  As shown in FIG. 4A, a male serration 125B is formed on the outer periphery of the inner shaft 12B on the front side of the vehicle body (the left side of FIG. 4A). An inner diameter hole 221 that fits outside the male serration 125B of the inner shaft 12B is formed on the inner periphery (on the right side of FIG. 4 (1)) of the input shaft 22 on the coupling portion side. A female serration 222 is formed to engage the 12B male serration 125B.

  Further, an annular protrusion 126B is formed on the inner shaft 12B at the vehicle body front end (left side of FIG. 4 (1)) of the male serration 125B of the inner shaft 12B. The annular protrusion 126B is formed in a cylindrical shape, the outer periphery 1263B of the annular protrusion 126B is smaller in diameter than the inner diameter of the inner diameter hole 221 of the input shaft 22, and an annular inclined contact surface 1261B is formed at the front end of the annular protrusion 126B in the vehicle body. Is formed.

  The inclined contact surface 1261B is inclined to the rear side of the vehicle body by an angle θ3 with respect to a plane orthogonal to the axis of the inner shaft 12B, and is connected to the inner periphery 1262B of the annular protrusion 126B. An annular groove 224 having a rectangular cross section as a locking surface is formed on the hole bottom 2211 at the front end of the vehicle body of the inner diameter hole 221 of the input shaft 22 (left side of FIG. 4 (1)). The inner periphery of the annular groove 224 is formed larger in diameter than the diameter of the tooth bottom of the female serration 222.

  When the female serration 222 of the input shaft 22 is externally fitted to the male serration 125B of the inner shaft 12B, the vehicle body front end surface of the annular protrusion 126B of the inner shaft 12B comes into contact with the hole bottom 2211 of the input shaft 22. When the input shaft 22 is further pushed into the inner shaft 12B from this state, the inclined contact surface 1261B of the annular protrusion 126B contacts the hole bottom 2211. Therefore, the annular protrusion 126B is connected to the annular groove 224 side of the input shaft 22 (on the input shaft). The ring-shaped protrusion 126B is pressed against the ring-shaped groove 224 (see FIG. 4B).

  Accordingly, with a machining operation that simply pushes the input shaft 22 into the inner shaft 12B, the annular protrusion 126B of the inner shaft 12B bites into the annular groove 224 of the input shaft 22, and the axial positions of the input shaft 22 and the inner shaft 12B are fixed. The Therefore, the coupling time between the inner shaft 12B and the input shaft 22 is shortened, and the processing equipment cost and the tool cost can be reduced.

  Next, a third embodiment of the present invention will be described. FIG. 5 is a longitudinal sectional view showing the main part of the coupling portion of the steering shaft according to the third embodiment of the present invention. In the following description, only structural portions and operations different from the above embodiment will be described, and redundant description will be omitted. Further, the same parts as those in the above embodiment will be described with the same numbers.

  The third embodiment is a modification of the second embodiment, in which an annular protrusion is formed on the inner shaft 12B side, and the annular protrusion is brought into contact with a ball inserted into the inner diameter hole 221 of the input shaft 22, so that the annular protrusion This is an example in which is bent.

  As shown in FIG. 5A, a male serration 125B is formed on the outer periphery of the inner shaft 12B on the front side of the vehicle body (the left side of FIG. 5A). An inner diameter hole 221 that fits outside the male serration 125B of the inner shaft 12B is formed on the inner periphery (on the right side of FIG. 5 (1)) of the input shaft 22 on the coupling portion side. A female serration 222 is formed to engage the 12B male serration 125B.

  Further, an annular protrusion 126B is formed on the inner shaft 12B at the vehicle body front end (left side of FIG. 5 (1)) of the male serration 125B of the inner shaft 12B. The annular protrusion 126B is formed in a cylindrical shape, and the outer periphery 1263B of the annular protrusion 126B is formed to have a smaller diameter than the inner diameter of the inner diameter hole 221 of the input shaft 22.

  In addition, an annular inclined locking surface 2212 as a locking surface is formed at the front end of the female serration 222 in the inner diameter hole 221 of the input shaft 22. The inclined locking surface 2212 is inclined to the rear side of the vehicle body by an angle θ4 with respect to a plane orthogonal to the axis of the input shaft 22. Therefore, the inner diameter of the inclined locking surface 2212 is formed so as to increase from the vehicle body rear side toward the vehicle body front side.

  Further, the input shaft 22 is formed with a small-diameter inner diameter hole 225 having a smaller diameter than the inner diameter hole 221 at the front end of the inner diameter hole 221 in the vehicle body (on the left side of FIG. 5 (1)). A stepped portion 226 is formed at the connecting portion. A ball 227 having a smaller diameter than the inner diameter hole 221 and a larger diameter than the inner diameter 1262B of the annular protrusion 126B is inserted into the inner diameter hole 221. The outer periphery of the ball 227 and the inclined locking surface 2212 form a substantially V-shaped annular groove whose groove width decreases toward the front side of the vehicle body.

  When the female serration 222 of the input shaft 22 is externally fitted to the male serration 125B of the inner shaft 12B, the inner periphery 1262B of the annular protrusion 126B of the inner shaft 12B comes into contact with the outer periphery (inclined contact surface) of the ball 227. When the input shaft 22 is further pushed into the inner shaft 12B from this state, the annular protrusion 126B extends along the outer periphery of the ball 227 toward the inclined locking surface 2212 side of the input shaft 22 (in the direction away from the axis of the input shaft 22). The ring-shaped protrusion 126B is pressed against the inclined locking surface 2212 (see FIG. 5B).

  Accordingly, with the machining operation that simply pushes the input shaft 22 into the inner shaft 12B, the annular protrusion 126B of the inner shaft 12B bites into the inclined locking surface 2212 of the input shaft 22, and the axial positions of the input shaft 22 and the inner shaft 12B are changed. Fixed. Therefore, the coupling time between the inner shaft 12B and the input shaft 22 is shortened, and the processing equipment cost and the tool cost can be reduced.

  In the above embodiment, in order to transmit rotational torque from the inner shaft 12B to the input shaft 22, a male serration is formed on the inner shaft 12B, and a female serration that engages with the male serration is formed on the input shaft 22. . However, if the fitting dimension is such that the outer periphery of the inner shaft 12B is press-fitted into the inner diameter hole 221 of the input shaft 22, either male serration or female serration is sufficient, and both male serration and female serration are eliminated. Also good.

  In the above embodiment, the upper-side inner shaft 12B is a male shaft and the lower-side input shaft 22 is a female shaft. However, the upper-side inner shaft 12B is a female shaft, and the lower-side input shaft 22B is a female shaft. 22 may be fitted as a male shaft.

  Further, in the above-described embodiment, the example applied to the coupling portion between the steering shaft and the steering assist portion has been described, but the coupling portion between the motor shaft of the steering assist portion and the worm shaft, the worm wheel and the pinion shaft of the steering assist portion, The present invention can be applied to a connecting portion of a shaft at an arbitrary position constituting the steering device, such as a connecting portion.

BRIEF DESCRIPTION OF THE DRAWINGS The whole steering apparatus of Example 1 of this invention is shown, It is the front view which cut | disconnected one part, Comprising: The Example applied to the electric power steering apparatus is shown. It is a longitudinal cross-sectional view of the principal part of FIG. It is a longitudinal cross-sectional view which shows the principal part of the coupling | bond part of the steering shaft of Example 1 of this invention. It is a longitudinal cross-sectional view which shows the principal part of the coupling | bond part of the steering shaft of Example 2 of this invention. It is a longitudinal cross-sectional view which shows the principal part of the coupling | bond part of the steering shaft of Example 3 of this invention. It is a longitudinal cross-sectional view which shows the principal part of the coupling | bond part of the conventional propeller shaft.

Explanation of symbols

11 Steering wheel 12 Steering shaft 12A Outer shaft 12B Inner shaft (male shaft)
121A Female spline 121B Male spline 122B Large diameter shaft portion 123B Small diameter shaft portion 1231B Male serration 1232B Inclined locking surface 124B Stepped portion 1241B Inclined contact surface 125B Male serration 126B Annular projection 1261B Inclined contact surface 1262B Inner periphery 1263B Outer periphery 13 Steering column 13A Outer column 13B Inner column 14 Support bracket 15 Universal joint 16 Intermediate shaft 17 Universal joint 18 Car body 20 Assist device 21 Gear housing 22 Input shaft (female shaft)
221 inner diameter hole 2211 hole bottom 2212 inclined locking surface 222 female serration 223 annular protrusion 224 annular groove 225 small diameter inner diameter hole 226 stepped portion 227 ball 23 output shaft 24 torsion bar 25 worm wheel 26 electric motor 261 case 27 worm 28 torque sensor 29A, 29B, 29C Bearing 30 Steering gear 31 Input shaft 32 Tie rod 4 Yoke 41 Male serration 42 Caulking groove 5 Pipe 51 Contraction part 52 Female serration 53 Caulking part

Claims (8)

Male shaft constituting the steering device,
A female shaft having an inner diameter hole fitted on the outer periphery of the end of the male shaft on the coupling portion side, to which the rotation of the male shaft is transmitted;
An annular protrusion formed on the outer periphery of the end on the coupling portion side of either the male shaft or the female shaft;
An inclined contact surface that is formed on the other anti-joint portion side of the male shaft or the female shaft, and when the female shaft is externally fitted to the male shaft, the annular protrusion abuts and bends the annular protrusion;
A steering apparatus comprising a locking surface formed in the vicinity of the inclined contact surface on the other anti-joining portion side of either the male shaft or the female shaft, to which the bent annular protrusion is pressed. Male shaft constituting the steering device,
A female shaft having an inner diameter hole fitted on the outer periphery of the end of the male shaft on the coupling portion side, to which the rotation of the male shaft is transmitted;
An annular protrusion formed on the outer periphery of the end of the female shaft on the coupling portion side;
An inclination formed on the outer periphery of the male shaft on the side opposite to the coupling portion, and when the female shaft is externally fitted to the male shaft, the annular projection of the female shaft comes into contact and the annular projection is bent toward the axial center of the male shaft. Abutment surface,
A steering apparatus comprising an inclined locking surface formed in the vicinity of the inclined contact surface on the outer periphery of the male shaft on the side opposite to the coupling portion, to which the bent annular protrusion is pressed. Male shaft constituting the steering device,
A female shaft having an inner diameter hole fitted on the outer periphery of the end of the male shaft on the coupling portion side, to which the rotation of the male shaft is transmitted;
An annular protrusion formed on the outer periphery of the end of the male shaft on the coupling portion side;
An inclined contact surface formed on the inner periphery of the end of the annular protrusion on the coupling portion side;
When the female shaft is externally fitted to the male shaft, the inclined contact surface of the male shaft comes into contact with the male shaft, and the annular protrusion extends from the axial center of the male shaft. Hole bottom that bends away,
A steering apparatus comprising an annular groove formed in the vicinity of the bottom of an inner diameter hole on the side opposite to the coupling portion of the female shaft and to which the bent annular projection is pressed. Male shaft constituting the steering device,
A female shaft having an inner diameter hole fitted on the outer periphery of the end of the male shaft on the coupling portion side, to which the rotation of the male shaft is transmitted;
An annular protrusion formed on the outer periphery of the end of the male shaft on the coupling portion side;
Inserted into the inner diameter hole of the female shaft, has an outer diameter larger than the inner circumference of the annular projection, and when the female shaft is externally fitted to the male shaft, the inner circumference of the annular projection of the male shaft A ball that contacts and bends the annular protrusion away from the axis of the male shaft;
A steering apparatus comprising an inclined locking surface formed in an inner diameter hole on the side opposite to the coupling portion of the female shaft and to which the bent annular protrusion is pressed. In the steering device according to any one of claims 1 to 4,
Serrations are formed in either the inner diameter hole of the female shaft or the outer periphery of the male shaft,
The steering device, wherein when the female shaft is fitted on the male shaft, the serration is press-fitted into either the inner diameter hole of the female shaft or the outer periphery of the male shaft. In the steering device according to any one of claims 1 to 4,
Male serration formed on the outer periphery of the end of the male shaft on the coupling portion side,
A steering apparatus, comprising: a female serration formed in an inner diameter hole of the female shaft and externally fitted to the male serration of the male shaft when the female shaft is externally fitted to the male shaft. In the steering device according to any one of claims 1 to 4,
The male shaft is an upper side steering shaft,
The steering apparatus, wherein the female shaft is a lower side steering shaft that transmits the rotation of the upper side steering shaft to a steering gear. The steering apparatus according to claim 7, wherein
The steering apparatus according to claim 1, wherein the lower side steering shaft is an input shaft of a steering assist unit that applies a steering assist force proportional to a steering torque of the steering wheel.

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