JP4952962B2 - Universal joint and shaft connection structure - Google Patents

Universal joint and shaft connection structure Download PDF

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JP4952962B2
JP4952962B2 JP2011052388A JP2011052388A JP4952962B2 JP 4952962 B2 JP4952962 B2 JP 4952962B2 JP 2011052388 A JP2011052388 A JP 2011052388A JP 2011052388 A JP2011052388 A JP 2011052388A JP 4952962 B2 JP4952962 B2 JP 4952962B2
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shaft
portion
formed
yoke
peripheral surface
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JP2011137551A (en
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潤 山田
卓史 柴
誠一 森山
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日本精工株式会社
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Description

  The present invention relates to a universal joint, and more particularly, to a coupling structure of a universal joint and a shaft used for a connecting portion of a steering shaft of a steering device.

  In a steering device that steers the front wheels of a vehicle, the movement of a steering shaft that is rotated by the operation of a steering wheel is transmitted to an input shaft of a steering gear through a universal joint. In this universal joint, by connecting a pair of yokes via a cross shaft, the rotational force can be transmitted between the yokes even if the axes of the yokes are not located on the same straight line.

  In such a joint structure of a universal joint and a shaft, the male serration of the shaft is inserted into the female serration of the yoke, the shaft and the yoke are positioned at a predetermined axial position, and then the tightening bolt is tightened to By reducing the diameter, it is possible to position the yoke and the shaft in the axial direction and transmit the rotational torque.

  In such a conventional coupling structure, it is necessary to perform the tightening operation of the tightening bolt while holding the shaft and the yoke so as not to deviate from a predetermined axial position until the tightening operation of the tightening bolt is completed. Therefore, there is a problem that the assembling work is difficult to perform and it takes time to assemble.

  There is a universal joint disclosed in Patent Document 1 as a coupling structure of a universal joint and a shaft in which the shaft and the yoke are not displaced from a predetermined axial position until the fastening operation of the fastening bolt is completed. The universal joint of Patent Document 1 is elastically shrinkable by a slit, and has a cylindrical shaft insertion portion whose diameter is increased at the outer peripheral tip side, and a fastening ring that is fitted around the outer periphery of the shaft insertion portion and contracts the shaft insertion portion by a spring force. And a ball that is pressed by the tightening ring toward the center of the shaft insertion portion and engages with the V groove on the outer periphery of the shaft.

  The joint structure of the universal joint and the shaft of Patent Document 1 does not deviate from a predetermined axial position until the tightening operation of the tightening bolt is completed. However, the axial positioning of the shaft and the yoke, There is a problem that the tightening force of the shaft and the yoke cannot be increased because of the structure that performs the tightening simultaneously.

Japanese Patent Laid-Open No. 10-205545

  According to the present invention, the tightening force between the shaft and the yoke is large, the assembling work is easy, and the axial position of the shaft is held at a predetermined position with respect to the yoke until the work of coupling the shaft to the yoke with the tightening bolt is completed. Another object of the present invention is to provide a universal joint / shaft coupling structure that prevents the shaft from coming out of the yoke.

The above problem is solved by the following means. That is, according to the first aspect of the present invention, the distance between the pair of flange portions arranged in parallel to each other, the substantially cylindrical coupling tube portion connecting the lower ends of the pair of flange portions, and the pair of flange portions is set. A universal joint yoke having a bolt for reducing the diameter of the inner peripheral surface of the coupling cylinder part, and being inserted in parallel to the inner circumferential surface of the coupling cylinder part in the axial direction of the coupling cylinder part. A shaft having an outer peripheral surface that is fitted into the surface so that rotational torque can be transmitted, is formed on the outer peripheral surface of the shaft, and is in contact with the inner peripheral surface of the coupling cylinder portion when the shaft is inserted into the inner circumferential surface of the coupling cylinder portion. An engagement convex portion that is elastically deformable in a direction approaching the axis of the shaft, formed in communication with the inner peripheral surface of the coupling tube portion, and when the shaft is inserted into the yoke at a predetermined axial position, together with the engaging protrusion has returned to the axial center distance direction of the shaft is provided with an engaging engagement recess, the upper The inner peripheral surface of the coupling tubular portion female serration is formed, the male serration for transmitting rotational torque engages with the female serrations are formed on the outer peripheral surface of the shaft, further, the engaging protrusion is And an engagement cylinder separate from the shaft, in which a thin metal plate is formed in a bottomed cylindrical shape, and is formed up to a substantially intermediate position in the axial direction of the engagement cylinder fixed to the shaft. The portion sandwiched between the slits is bent in a direction away from the axis , and further, a hole for reducing the elastic coefficient of the engaging convex portion is formed in the bent portion, and on the outer peripheral surface of the shaft. A coupling structure of a universal joint and a shaft, wherein a small-diameter shaft portion having a smaller diameter than the outer diameter of the male serration is formed, and the engaging convex portion is fixed to the outer periphery of the small-diameter shaft portion. is there.

  In the universal joint / shaft coupling structure according to the present invention, when the shaft is inserted into the inner peripheral surface of the coupling tube portion, the engagement is made so as to abut against the inner circumferential surface of the coupling tube portion and to be elastically deformed in a direction approaching the axis of the shaft. A mating convex portion is formed on the outer peripheral surface of the shaft, and when the shaft is inserted into the yoke at a predetermined axial position, an engaging concave portion that can be engaged with the engaging convex portion is communicated with the inner peripheral surface of the coupling cylindrical portion. Formed.

  Further, in the universal joint / shaft coupling structure of the present invention, when the shaft is inserted into the inner peripheral surface of the coupling tube portion, the engagement comes into contact with the outer peripheral surface of the shaft and is elastically deformable in a direction away from the shaft center. A convex portion is formed on the inner peripheral surface of the coupling cylinder portion, and an engaging concave portion that can be engaged with the engaging convex portion is formed on the outer peripheral surface of the shaft when the shaft is inserted into the yoke at a predetermined axial position. Yes.

  Therefore, the tightening force between the shaft and the yoke is large, and the assembling work is easy. Until the work of connecting the shaft to the yoke with the tightening bolt is completed, the engaging convex portion and the engaging concave portion that are engaged with each other are used for the yoke. Thus, the axial position of the shaft is held at a predetermined position, and the shaft can be prevented from coming out of the yoke.

  Embodiments 1 to 7 of the present invention will be described below with reference to the drawings.

  FIG. 1 is an overall front view of a steering apparatus having a universal joint / shaft coupling structure according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional front view showing a coupling state of the coupling structure of the universal joint and the shaft according to the first embodiment of the present invention. 3 is a cross-sectional view taken along the line AA in FIG. 4 is a cross-sectional view taken along the line BB in FIG. FIG. 5 is a partial cross-sectional front view showing a state before the coupling structure of the universal joint and shaft of FIG. 2 is coupled.

  As shown in FIG. 1, a steering apparatus having a universal joint / shaft coupling structure according to Embodiment 1 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 FIG. 1), A steering column 13 inserted through the steering shaft 12, an assist device (steering assisting portion) 20 for applying auxiliary torque to the steering shaft 12, and a vehicle body front side (left side in FIG. 1) of the steering shaft 12 And a steering gear 30 connected via a rack / pinion mechanism (not shown).

  The steering shaft 12 is spline-fitted between a female steering shaft 12A and a male steering shaft 12B so as to be able to transmit rotational torque and to be relatively movable in the axial direction. Therefore, when the female steering shaft 12A and the male steering shaft 12B collide, the spline fitting portion moves relative to each other so that the total 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 front end portion of the male steering shaft 12B on the vehicle body is passed through the inside of the gear housing 21 and connected to the rear end portion of the assist device 20 on the rear side of the input shaft (not shown).

  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 front end face of the gear housing 21 on the vehicle body is connected to the rear end portion of the intermediate shaft 15 via a universal joint (upper universal joint) 4. Further, a pinion shaft (hereinafter referred to as a shaft) 6 of the steering gear 30 is connected to the front end portion of the intermediate shaft 15 via another universal joint (lower universal joint) 5. The intermediate shaft 15 is fitted on the vehicle body front side of the male intermediate shaft (male shaft) 15A on the vehicle body rear side of the female intermediate shaft (female shaft) 15B so as to be able to transmit rotational torque and relatively move in the axial direction. Is fitted.

  A pinion (not shown) is formed at the lower end (front end of the vehicle body) of the shaft 6. A rack (not shown) meshes with the pinion, and rotation of the steering wheel 11 moves the tie rod 31 to steer a wheel (not shown).

  A case 261 of an electric motor 26 is fixed to the gear housing 21 of the assist device 20, and a worm is coupled to a rotating shaft (not shown) of the electric motor 26. A worm wheel (not shown) is attached to the output shaft 23, and the worm of the rotating shaft of the electric motor 26 is engaged with the worm wheel.

  A torque sensor (not shown) is provided around the intermediate portion of the output shaft 23. The direction and magnitude of the torque applied from the steering wheel 11 to the steering shaft 12 is detected by a torque sensor, and the electric motor 26 is driven in accordance with the detected value via a reduction mechanism comprising a worm and a worm wheel. Then, the output shaft 23 is caused to generate auxiliary torque with a predetermined magnitude in a predetermined direction. The assist device that generates the auxiliary torque is not limited to an electric type, and may be a hydraulic assist device.

  2 to 5 show the coupling structure of the universal joint and the shaft according to the first embodiment of the present invention, and show an example applied to the coupling portion between one yoke 51 and the shaft 6 of the universal joint 5 of FIG. The universal joint / shaft coupling structure of the present invention may be applied to the joint between the universal joint 4 and the male intermediate shaft 15 </ b> A in FIG. 1 or the joint between the universal joint 4 and the output shaft 23.

  FIGS. 2 to 5 show a coupling structure between one of the pair of yokes 51 and 51 constituting the universal joint 5 according to the first embodiment of the present invention and the shaft 6. A bifurcated coupling arm 52 is formed on the left side of the yoke 51 (FIG. 2), and the other yoke 51 is connected to the other yoke 51 via a cross shaft (not shown) inserted into a circular hole 521 formed in the coupling arm 52. Are combined. Therefore, the rotational force can be transmitted between the yokes 51 and 51 even if the centers of the yokes 51 and 51 are not located on the same straight line.

  A substantially cylindrical coupling cylinder portion 53 is formed on the right side (FIG. 2) of the yoke 51, and the coupling cylinder portion 53 is formed on the female serration 531 formed on the inner peripheral surface of the coupling cylinder portion 53 from the right side of FIG. The shaft 6 is inserted in parallel to the axial direction of the shaft 6, and the male serration 61 formed on the outer peripheral surface of the shaft 6 is serrated to the female serration 531 so that rotational torque can be transmitted.

  As shown in FIG. 4, a pair of left and right flange portions 54 </ b> A and 54 </ b> B are formed in the coupling cylinder portion 53 of the yoke 51, extending in the tangential direction from the coupling cylinder portion 53 and then folded inward. A slit 56 communicating with the female serration 531 is formed between the flange portions 54A and 54B.

  Further, bolt holes 541A and 541B are formed through the flange portions 54A and 54B in the left-right direction in FIG. 4 (the direction perpendicular to the axis of the coupling tube portion 53). Bolts 55 are inserted into the bolt holes 541A and 541B from the right side of FIG. When the nut 551 is screwed into the bolt 55, the flange portions 54A and 54B are elastically deformed to narrow the width of the slit 56, the female serration 531 is reduced in diameter, and the male serration 61 of the shaft 6 can be strongly tightened.

  A substantially U-shaped recess 62 is formed in the upper part of the male serration 61 of the shaft 6, and when the shaft 6 is about to come out from the coupling cylinder portion 53 of the yoke 51 to the right side in FIG. The shaft 6 is prevented from coming out of the coupling cylinder portion 53 of the yoke 51 by coming into contact with the recess 62.

  As shown in FIGS. 2 and 5, the shaft 6 is formed with a small-diameter shaft portion 63 having a smaller diameter than the outer diameter of the male serration 61 at the left end of the male serration 61. The small diameter shaft portion 63 is press-fitted with an engagement tube 71 from the left side of the small diameter shaft portion 63, and is fixed to the shaft 6 so that the engagement tube 71 does not move in the axial direction and the rotational direction.

  As shown in FIGS. 5 (2) and 5 (3), the engagement cylinder 71 is a metal thin plate (for example, a plate thickness of 0.2 to 0.5 mm) with a bottomed cylindrical shape (for example, the diameter of the cylinder is 15 mm). In the upper part of the engagement cylinder 71, slits 711 and 711 are formed from the right end surface side to the left side of the engagement cylinder 71. The slits 711 and 711 are formed up to substantially the middle position of the axial length of the engagement cylinder 71, and the rectangular engagement convex portion 712 sandwiched between the slits 711 and 711 is upward (the axis of the shaft 6 It is bent away from the heart).

  The engaging convex portion 712 is bent at an angle θ1 in a direction away from the axis of the shaft 6 from the left side to the right side in FIGS. 2 and 5. Further, the right end (located at a position farthest from the axis of the shaft 6) 713 of the engagement convex portion 712 is located at a position farther from the axis of the shaft 6 than the inner periphery of the female serration 531.

  As shown in FIGS. 2, 3, and 5, the flanges 54 </ b> A and 54 </ b> B are formed with engaging recesses 81 that communicate with the slits 56 from the outer peripheral surface of the yoke 51 toward the female serration 531. Has been. That is, the engagement recess 81 penetrates from the outer peripheral surface of the yoke 51 to the female serration 531. As seen in FIG. 3, the width W <b> 1 in the left-right direction of the engagement recess 81 is formed slightly wider than the width W <b> 2 in the left-right direction of the engagement protrusion 712. The angular phase of the engagement concave portion 81 is formed at a position that matches the angular phase of the engagement convex portion 712. Further, the width W2 in the left-right direction of the engaging convex portion 712 is formed wider than the width W3 in the left-right direction of the slit 56 between the flange portions 54A, 54B.

  The connecting procedure of the yoke 51 and the shaft 6 of the first embodiment configured as described above is as follows. That is, the shaft 6 is inserted into the female serration 531 formed in the coupling cylinder portion 53 of the yoke 51 from the right side of FIG. 2 in parallel to the axial direction of the coupling cylinder portion 53. Then, the engaging convex portion 712 of the engaging tube 71 fixed to the small diameter shaft portion 63 at the left end of the shaft 6 abuts on the inner periphery of the female serration 531 and elastically deforms in a direction approaching the axis of the shaft 6. .

  Therefore, the small-diameter shaft portion 63 and the engaging convex portion 712 of the shaft 6 enter the female serration 531 of the yoke 51, and the male serration 61 of the shaft 6 starts serration engagement with the female serration 531 of the yoke 51. Since the width W2 in the left-right direction of the engagement convex portion 712 is formed wider than the width W3 in the left-right direction of the slit 56, the right end 713 of the engagement convex portion 712 is illustrated along the inner periphery of the female serration 531. Move to the left side of 2.

  When the shaft 6 is further inserted on the left side of FIG. 2 and the right end 713 of the engaging convex portion 712 of the shaft 6 passes through the right inner wall 811 of the engaging concave portion 81 of the yoke 51, the elastic force of the engaging convex portion 712 causes The engaging convex portion 712 returns in a direction away from the axis of the shaft 6.

  As a result, the right end 713 of the engaging convex portion 712 returns to a position farther from the axis of the shaft 6 than the inner periphery of the female serration 531, and the right end 713 of the engaging convex portion 712 enters the engaging concave portion 81. . Therefore, even if a force is applied in the direction in which the shaft 6 is pulled out from the yoke 51 (right direction in FIG. 2), the right end 713 of the engaging convex portion 712 contacts the right inner wall 811 of the engaging concave portion 81. The shaft 6 is held at a predetermined axial position with respect to the shaft 51, and the shaft 6 does not come out of the yoke 51.

  In this state, if the bolt 55 is inserted into the bolt holes 541A and 541B and the nut 551 is screwed into the bolt 55, the flange portions 54A and 54B are elastically deformed in a direction approaching each other, and the female serration 531 is reduced in diameter. Six male serrations 61 can be firmly clamped and fixed by female serrations 531. Therefore, since the axial position of the shaft 6 is held at the predetermined assembly position until the bolt 55 is tightened, there is no need to manually hold the shaft and the yoke so that they do not deviate from the predetermined axial position. Work becomes easy.

  Further, when the shaft 6 thus coupled is removed from the yoke 51, first, the nut 551 is loosened, and the bolt 55 is removed from the bolt holes 541A and 541B. Thereafter, as shown in FIG. 2, a rod-shaped pressing jig 82 (shown by a two-dot chain line in FIG. 2) is inserted into the engagement recess 81 from the opening 812 side (upper side in FIG. 2) of the engagement recess 81. The engaging projection 712 is pushed by the lower end of the pressing jig 82.

  The shaft 6 is pulled out from the yoke 51 to the right in FIG. 2 in a state where the right end 713 of the engaging convex portion 712 is elastically deformed to the axial center side of the shaft 6 with respect to the inner periphery of the female serration 531. Then, the right end 713 of the engagement convex portion 712 is disengaged from the engagement concave portion 81 and can move to the right side in FIG. 2 along the inner periphery of the female serration 531, so that the shaft 6 can be detached from the yoke 51. .

  In the first embodiment, the engaging recess 81 is formed at the same angular phase position as the slit 56, but the position where the engaging recess 81 is formed is not limited to the angular phase of the first embodiment. That is, in accordance with the angular phase of the engaging convex portion 712 attached to the shaft 6, the engaging concave portion is positioned at an arbitrary angular phase position of the coupling cylindrical portion 53 so as to match the angular phase of the engaging convex portion 712 of the shaft 6. 81 may be formed.

  Further, as shown in FIG. 2, a protrusion 66 (2) that protrudes from the inner periphery of the female serration 531 to a position farther from the axis of the shaft 6 than the inner periphery of the female serration 531 beyond the male serration 61 of the shaft 6. (Shown by a dotted line). In this way, when the yoke 51 and the shaft 6 are coupled, it is possible to prevent the projection 66 from coming into contact with the right end surface 58 of the yoke 51 and the shaft 6 from going to the left, so that the assembling work is further facilitated.

  Next, a second embodiment of the present invention will be described. FIG. 6 is a plan view of an axis according to the second embodiment of the present invention. In the following description, only structural portions and operations different from those of the first embodiment will be described, and overlapping descriptions will be omitted. Further, the same parts will be described with the same numbers.

  The second embodiment is an example in which the shape of the engaging convex portion 712 of the first embodiment is changed. That is, as shown in FIG. 6, a circular hole 714 is formed in the bent portion of the engaging convex portion 712 to reduce the elastic coefficient of the engaging convex portion 712. The shape of the hole 714 is not limited to a circle, and may be a hole having an arbitrary shape such as a rectangle or a triangle.

  As a result, the engaging convex portion 712 is easily elastically deformed, so that the resistance when the shaft 6 is inserted into the female serration 531 of the yoke 51 is reduced, and the shaft 6 can be inserted into the yoke 51 with a small force. Therefore, the assembly work becomes easy.

  Next, a third embodiment of the present invention will be described. FIG. 7 is a partial cross-sectional front view showing a state before the yoke and shaft of the universal joint according to Embodiment 3 of the present invention are coupled. 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 will be described with the same numbers.

  The third embodiment is an example in which the shape of the engagement concave portion of the first embodiment is changed. That is, as shown in FIG. 7, a rectangular engagement convex portion 712 is provided below (on the shaft 6) a lower portion (downward in FIG. 7) of the engagement cylinder 71 press-fitted into the small diameter shaft portion 63 of the shaft 6. (In a direction away from the axial center). The coupling cylinder portion 53 is formed with an engagement recess 81 communicating with the female serration 531 at the same angular phase position as the engagement projection 712. In the engaging recess 81 of the third embodiment, an opening that opens to the outer periphery (the lower side in FIG. 7) of the coupling cylinder portion 53 is not formed.

  Next, a fourth embodiment of the present invention will be described. FIG. 8 is a partial cross-sectional front view showing a coupling state of a universal joint / shaft coupling structure according to Embodiment 4 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 will be described with the same numbers.

  The fourth embodiment is an example in which the shape of the engaging convex portion of the first embodiment is changed. That is, as shown in FIG. 8, an engagement convex portion 722 bent into a mountain shape is formed on the upper portion (upper portion of FIG. 8) of the engagement cylinder 72 press-fitted into the small diameter shaft portion 63 of the shaft 6. .

  The shaft 6 is inserted into the female serration 531 formed in the coupling cylinder portion 53 of the yoke 51 from the right side of FIG. 8 in parallel to the axial direction of the coupling cylinder portion 53. Then, the mountain-shaped vertex (R-shaped portion at the tip) 723 of the engagement convex portion 722 at the left end of the shaft 6 abuts on the inner periphery of the female serration 531, and the angle of inclination of the mountain-shaped vertex 723 becomes gentle. Elastically deforms.

  Accordingly, the engaging convex portion 722 enters the female serration 531 of the yoke 51, and then the male serration 61 of the shaft 6 starts serration engagement with the female serration 531 of the yoke 51. When the shaft 6 is further inserted on the left side of FIG. 8 and the peak 723 of the engagement projection 722 passes through the right inner wall 811 of the engagement recess 81 of the yoke 51, the angle of the projection is increased by the elastic force of the engagement projection 722. The vertex 723 enters the engagement recess 81.

  Therefore, even if a force is applied in the direction in which the shaft 6 is pulled out from the yoke 51, the mountain-shaped apex 723 abuts against the right inner wall 811 of the engaging recess 81, so that the shaft 6 is assembled to the yoke 51 in a predetermined axial direction. While being held in position, the shaft 6 does not come out of the yoke 51.

  Next, a fifth embodiment of the present invention will be described. FIG. 9 is a partial cross-sectional front view showing a coupling state of the universal joint / shaft coupling structure according to the fifth 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 will be described with the same numbers.

  The fifth embodiment is an example in which the shape of the engaging convex portion of the first embodiment is changed. That is, as shown in FIG. 9, a narrow lower extension 731 is provided at the lower portion of the engaging cylinder 73 that is caulked and fixed to the outer periphery of the small-diameter shaft portion 63 of the shaft 6 (downward in FIG. 9). It extends beyond the male serration 61 to the small diameter shaft portion 64 on the right side. The engagement cylinder 73 is also fixed by caulking to the outer periphery of the small-diameter shaft portion 64 on the right side. The lower part of the male serration 61 is scraped off so that the lower extension 731 can extend to the small diameter shaft 64 on the right side.

  At the right end of the lower extension portion 731, a rectangular engagement convex portion 732 is formed that is bent downward (in a direction away from the axis of the shaft 6). The engaging convex portion 732 is bent at an angle θ2 in a direction away from the axis of the shaft 6 from the left side to the right side in FIG. Further, the right end of the engagement convex portion 732 (located at the position farthest from the axis of the shaft 6) 733 is located at a position farther from the axis of the shaft 6 than the inner periphery of the female serration 531. An engagement recess 81 that communicates with the female serration 531 is formed in the coupling cylinder portion 53 of the yoke 51 at the same angular phase position as the engagement protrusion 732.

  The shaft 6 is inserted into the female serration 531 of the yoke 51 from the right side of FIG. Then, the small-diameter shaft portion 63 and the male serration 61 of the shaft 6 enter the female serration 531 of the yoke 51, and the male serration 61 of the shaft 6 starts to engage with the female serration 531 of the yoke 51.

  The engaging convex portion 732 of the engaging cylinder 73 fixed to the shaft 6 abuts on the inner periphery of the female serration 531 and elastically deforms in a direction approaching the axis of the shaft 6, and the right end 733 of the engaging convex portion 732. Moves to the left side of FIG. 9 along the inner periphery of the female serration 531.

  When the shaft 6 is further inserted on the left side in FIG. 9 and the right end 733 of the engaging convex portion 732 of the shaft 6 passes through the right inner wall 811 of the engaging concave portion 81, the engaging convex portion 732 causes the engaging convex portion The part 732 returns in a direction away from the axis of the shaft 6.

  As a result, the right end 733 of the engaging convex portion 732 returns to a position farther from the axis of the shaft 6 than the inner periphery of the female serration 531, and the right end 733 of the engaging convex portion 732 enters the engaging concave portion 81. . Therefore, even if a force is applied in the direction in which the shaft 6 is pulled out from the yoke 51, the right end 733 of the engaging convex portion 732 contacts the right inner wall 811 of the engaging concave portion 81. While being held at the assembly position in the axial direction, the shaft 6 does not come out of the yoke 51.

  Next, a sixth embodiment of the present invention will be described. FIG. 10 is a partial cross-sectional front view showing a state before the coupling structure between the universal joint and the shaft according to the sixth 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 will be described with the same numbers.

  The sixth embodiment is an example in which the shape of the engaging convex portion of the first embodiment is changed. That is, as shown in FIG. 10, the small diameter shaft portion 63 of the above embodiment is not formed at the left end of the male serration 61 of the shaft 6. Further, the engagement recess 81 is not formed in the yoke 51. Instead, an annular groove 65 is formed on the outer periphery of the male serration 61 on the right side of the concave portion 62 of the shaft 6, and an elastic material such as rubber or synthetic resin is formed in an annular shape in the annular groove 65. The engaged convex portion 742 is wound. The diameter of the outer periphery of the engaging convex part 742 is formed larger than the inner diameter of the inner periphery of the female serration 531.

  The shaft 6 is inserted into the female serration 531 of the yoke 51 from the right side of FIG. Then, the male serration 61 of the shaft 6 enters the female serration 531 of the yoke 51, and the male serration 61 of the shaft 6 starts to engage with the female serration 531 of the yoke 51.

  Since the engaging convex portion 742 fixed to the annular groove 65 of the shaft 6 abuts on the inner periphery of the female serration 531 and is elastically deformed in a direction approaching the axis of the shaft 6, the inner periphery of the female serration 531 The engaging protrusion 742 can be moved along the left side of FIG.

  When the shaft 6 is further inserted on the left side of FIG. 10 and the shaft 6 reaches a predetermined axial position of the yoke 51, the bolt 55 is inserted into the bolt holes 541A and 541B, and the nut 551 is screwed into the bolt 55. Then, the flange portions 54A and 54B are elastically deformed in a direction approaching each other, the female serration 531 is reduced in diameter, and the male serration 61 of the shaft 6 can be firmly tightened and fixed by the female serration 531.

  Until the tightening by the bolt 55 is completed, the axial position of the shaft 6 is changed by the frictional force (acting between the engaging protrusion 742 and the inner periphery of the female serration 531) due to the elastic deformation of the engaging protrusion 742. Since it is held at a predetermined assembling position, the assembling work becomes easy.

  In Example 6, the engagement convex portion 742 may be a C-shaped ring (C-shaped retaining ring for shaft) formed of spring steel or the like. The diameter of the outer periphery of the C-shaped ring in a free state is larger than the inner diameter of the inner periphery of the female serration 531.

  When the shaft 6 is inserted into the female serration 531 of the yoke 51 from the right side in FIG. 10, the outer periphery of the C-shaped ring comes into contact with the chamfered portion at the right end of the female serration 531 and approaches the axis of the shaft 6. In order to reduce the diameter (elastically deform), the C-shaped ring can be moved to the left side of FIG. 10 along the inner periphery of the female serration 531. Until the tightening with the bolt 55 is completed, the axial position of the shaft 6 is predetermined by the frictional force (acting between the C-shaped ring and the inner periphery of the female serration 531) due to the elastic deformation of the C-shaped ring. Since it is held at the assembly position, assembly work becomes easy.

  In addition, an annular groove is formed on the inner periphery of the female serration 531, and an engagement convex portion formed by annularly forming an elastic material or a C-shaped ring (C-shaped retaining ring for a hole) is fitted into the annular groove. The diameter of the inner periphery of the engaging projection or C-shaped ring may be smaller than the inner diameter of the outer periphery of the male serration 61 of the shaft 6. In this case, the axial position of the shaft 6 is held at a predetermined assembly position by a frictional force acting between the annular engaging convex portion or the C-shaped ring and the outer periphery of the male serration 61.

  Next, a seventh embodiment of the present invention will be described. FIG. 11 is a partial cross-sectional front view showing a coupling state of a universal joint / shaft coupling structure according to Embodiment 7 of the present invention. 12 is a cross-sectional view taken along the line CC of FIG. 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 will be described with the same numbers.

  In the first to sixth embodiments described above, the engaging convex portion is formed on the shaft 6 side and the engaging concave portion is formed on the yoke 51 side. This is an example in which an engaging convex portion is formed on the yoke 51 side and an engaging concave portion is formed on the shaft 6 side to engage the engaging convex portion.

  That is, as shown in FIGS. 11 to 12, the small-diameter shaft portion 63 is not formed at the left end of the male serration 61 of the shaft 6 as in the sixth embodiment. Further, the engagement recess 81 is not formed in the yoke 51.

  Instead, a large-diameter hole 57 having a diameter larger than the inner diameter of the female serration 531 is formed at the right end of the female serration 531 of the yoke 51. An engagement cylinder 75 is fitted into the large diameter hole 57 from the right side of the large diameter hole 57, and the engagement cylinder 75 is caulked into the large diameter hole 57, so that The engagement cylinder 75 is fixed so as not to move in the rotation direction.

  The engagement cylinder 75 is formed by forming a thin metal plate into a cylindrical shape, and a rectangular engagement convex portion 752 is formed on the upper portion of the engagement cylinder 75 downward (in a direction approaching the axis of the shaft 6). ) It is bent. The engaging protrusion 752 is bent at an angle θ3 in a direction approaching the axis of the shaft 6 from the right side to the left side in FIG. In addition, the left end of the engaging convex portion 752 (located closest to the axis of the shaft 6) 753 is positioned closer to the axis of the shaft 6 than the outer periphery of the male serration 61.

  In addition, an engagement recess (annular groove) 83 having a smaller diameter than the outer periphery of the male serration 61 is formed on the shaft 6 on the right side of the male serration 61.

  The connecting procedure of the yoke 51 and the shaft 6 of the seventh embodiment configured as described above is as follows. That is, the shaft 6 is inserted into the female serration 531 formed in the coupling cylinder portion 53 of the yoke 51 from the right side of FIG. Then, the left end 753 of the engaging convex portion 752 contacts the outer peripheral portion of the left end of the male serration 61 of the shaft 6, and the engaging convex portion 752 is elastically deformed in a direction away from the axis of the shaft 6.

  Accordingly, the male serration 61 of the shaft 6 enters the female serration 531 of the yoke 51, and the male serration 61 of the shaft 6 starts serration engagement with the female serration 531 of the yoke 51.

  When the shaft 6 is further inserted on the left side of FIG. 11 and the right end of the male serration 61 of the shaft 6 passes the left end 753 of the engaging convex portion 752, the engaging convex portion 752 is pivoted by the elastic force of the engaging convex portion 752. Return to a direction approaching the axis 6.

  As a result, the left end 753 of the engagement protrusion 752 returns to a position closer to the axis of the shaft 6 than the outer periphery of the male serration 61, and the left end 753 of the engagement protrusion 752 enters the engagement recess 83. Therefore, even if a force is applied in the direction in which the shaft 6 is pulled out from the yoke 51, the left end 753 of the engaging convex portion 752 contacts the left step surface 831 of the engaging concave portion 83. And the shaft 6 does not come out of the yoke 51.

  In the above-described embodiment, the example in which the present invention is applied to the coupling structure that transmits the rotational torque between the shaft and the yoke by serration has been described. However, the present invention is not limited to serration engagement. The present invention may be applied to a coupling structure that transmits rotational torque.

  Moreover, in the said Example, although only one engagement convex part 712,722,732,752 is formed in the circumferential direction, a plurality of engagement convex parts are arranged at equal intervals or unequal intervals in the circumferential direction. A plurality of engagement recesses may be formed, and the plurality of engagement projections may engage with each other.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall front view of a steering apparatus including a universal joint / shaft coupling structure according to an embodiment of the present invention. It is the front view which carried out the cross section of a part which shows the joint state of the joint structure of the universal joint of Example 1 of the present invention, and a shaft. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. FIG. 3 is a partial cross-sectional front view showing a state before the coupling structure of the universal joint and shaft of FIG. 2 is coupled. It is a top view of the axis | shaft of Example 2 of this invention. It is the front view which carried out the cross section of a part which shows the state before the coupling | bonding of the yoke and shaft of the universal joint of Example 3 of this invention. It is the front view which carried out the cross section of a part which shows the joint state of the joint structure of the universal joint of Example 4 of this invention, and a shaft. It is the front view which carried out the cross section of a part which shows the joint state of the joint structure of the universal joint of Example 5 of this invention, and a shaft. It is the front view which carried out the cross section of a part which shows the state before the coupling | bonding of the coupling structure of the universal joint of the Example 6 of this invention, and a shaft. It is the front view which carried out the cross section of a part which shows the joint state of the joint structure of the universal joint and shaft of Example 7 of the present invention. It is CC sectional drawing of FIG.

DESCRIPTION OF SYMBOLS 11 Steering wheel 12 Steering shaft 12A Female steering shaft 12B Male steering shaft 13 Steering column 13A Outer column 13B Inner column 14 Support bracket 15 Intermediate shaft 15A Male intermediate shaft 15B Female intermediate shaft 18 Car body 20 Assist device 21 Gear housing 23 Output shaft 26 Electric Motor 261 Case 30 Steering gear 31 Tie rod 4 Universal joint (upper universal joint)
5 Universal joint (lower universal joint)
51 Yoke 52 Coupling arm part 521 Circular hole 53 Coupling cylinder part 531 Female serration 54A, 54B Flange part 541A, 541B Bolt hole 55 Bolt 551 Nut 552 Shaft outer periphery 56 Slit 57 Large diameter hole 58 Right end face 6 Shaft 61 Male serration 62 Recessed part 63 Small-diameter shaft portion 64 Small-diameter shaft portion 65 Annular groove 66 Protrusion 71 Engagement tube 711 Slit 712 Engagement projection 713 Right end 714 Hole 72 Engagement tube 722 Engagement projection 723 Peak of mountain 73 Engagement tube 731 Lower extension 732 Engaging convex part 733 Right end 742 Engaging convex part 75 Engaging cylinder 752 Engaging convex part 753 Left end 81 Engaging concave part 811 Right inner wall 812 Opening part 82 Pressing jig 83 Engaging concave part (annular groove)
831 Left step surface

Claims (1)

  1. A space between the pair of flange portions arranged in parallel to each other, a substantially cylindrical coupling tube portion connecting the lower ends of the pair of flange portions, and the pair of flange portions is reduced, and the inside of the coupling tube portion is A universal joint yoke having bolts for reducing the diameter of the peripheral surface;
    A shaft having an outer peripheral surface that is inserted in parallel to the axial direction of the coupling cylinder portion on the inner circumferential surface of the coupling cylinder portion, and is fitted into the inner circumferential surface of the coupling cylinder portion so as to transmit rotational torque.
    An engaging convex portion that is formed on the outer peripheral surface of the shaft and is elastically deformable in a direction approaching the shaft center of the shaft by contacting the inner peripheral surface of the connecting tube portion when the shaft is inserted into the inner peripheral surface of the connecting tube portion. ,
    The engaging projection is formed in communication with the inner peripheral surface of the coupling cylinder, and is returned to a direction away from the axis of the shaft when the shaft is inserted into the yoke at a predetermined axial position. With possible engagement recesses,
    A female serration is formed on the inner peripheral surface of the coupling cylinder portion, and a male serration that engages with the female serration and transmits rotational torque is formed on the outer peripheral surface of the shaft.
    The engaging convex portion is an engaging cylinder separate from the shaft, in which a metal thin plate is formed in a bottomed cylindrical shape, and is an approximately intermediate position in the axial direction of the engaging cylinder fixed to the shaft. The portion sandwiched between the two slits formed up to is bent in a direction away from the axial center, and further, a hole for reducing the elastic coefficient of the engaging convex portion is formed in the bent portion , A small-diameter shaft portion having a smaller diameter than the outer diameter of the male serration is formed on the outer peripheral surface of the shaft, and the engaging convex portion is fixed to the outer periphery of the small-diameter shaft portion. Universal joint and shaft connection structure.
JP2011052388A 2011-03-10 2011-03-10 Universal joint and shaft connection structure Active JP4952962B2 (en)

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US9086097B2 (en) * 2012-11-21 2015-07-21 GM Global Technology Operations LLC Universal joint

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JPS4514982Y1 (en) * 1966-06-03 1970-06-24
JPS6051976B2 (en) * 1978-05-19 1985-11-16 Hitachi Seiko Kk
JPS6351096B2 (en) * 1980-12-10 1988-10-12 Showa Denko Kk
US4536806A (en) * 1982-04-02 1985-08-20 Ampex Corporation Microprocessor controlled multiple servo system for a recording and/or reproducing apparatus
JP3932597B2 (en) * 1997-03-28 2007-06-20 マツダ株式会社 Shaft coupling structure

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