JP2015127175A - Coupling device of steering device, and coupling structure of rotary member and universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling device of a steering device and a coupling structure of a rotary member and a universal joint which can improve a contact state between the shaft-shaped rotary member and a yoke of the universal joint, and suppress the abrasion of a serration part.SOLUTION: A coupling device 6 of a steering device 1 comprises: a first universal joint 7 having a first yoke 61 coupled with an end part of a pinion shaft 50; and a middle shaft 60 coupled with the pinion shaft 50 through the first universal joint 7. The first yoke 61 comprises: an engagement part 611 in which an engagement hole 610 to be engaged with the pinion shaft 50 and first and second slits 611c, 611care formed; an enclosure member 65 disposed so as to surround the engagement part 611; and a bolt 66 for pressing a pressed part 611d between the first and second slits 611c, 611cin the engagement part 611, which is attached to the enclosure member 65. The enclosure member 65 presses the engagement part 611 from the opposite side of the bolt 66 by a reaction force of the pressing force of the bolt 66.

Description

  The present invention relates to a coupling device for a steering device that couples a steering shaft and a steering mechanism, and a coupling structure that couples a shaft-like rotating member and a universal joint.

  The steering device transmits the rotational force of the steering wheel from the steering shaft rotatably supported inside the steering column to the pinion shaft of a steering mechanism such as a rack and pinion mechanism via an intermediate shaft to rotate the steering wheel of the vehicle. Rudder. The steering shaft and the pinion shaft are connected via an intermediate shaft and universal joints at both ends thereof.

  The universal joint is coupled by inserting a shaft-like rotating member into the fitting hole of the cylindrical portion of the yoke. Serrations (serration portions) extending in the axial direction are formed on the inner peripheral surface of the fitting hole of the cylindrical portion and the outer peripheral surface of the rotating member. For this reason, the cylindrical portion and the shaft member are connected by inserting the shaft member into the fitting hole of the universal joint yoke and tightening the cylindrical portion so that the serration portion does not play in the rotational direction. (For example, refer to Patent Documents 1 and 2).

  The steering device described in Patent Document 1 forms a slit in the tubular portion of the universal joint yoke and a bolt insertion hole that intersects the slit, and inserts a rotating member into the fitting hole of the tubular portion, By inserting a bolt into the bolt insertion hole and tightening the tubular portion, the tubular portion of the yoke and the rotating member are connected.

  The steering device described in Patent Document 2 includes an outer shaft connected to the yoke of one universal joint, an inner shaft that is serrated to the outer shaft and connected to the yoke of the other universal joint, A ring spring disposed on the outside and having a plurality of convex portions at equal intervals. The outer shaft is elastically tightened by the convex part of the ring spring to suppress the play in the rotational direction of the serration part.

JP 2013-160370 A JP2013-160269A

  However, according to the steering device disclosed in Patent Document 1, since the tightening force is applied to the periphery of the slit portion of the cylindrical portion, the serration of the rotating member is provided at two positions on the slit side of the serration portion in the cylindrical portion of the yoke. Although it is pressed against the portion, the portion on the opposite side of the slit may not come into contact, and the wear of the serration portion may be promoted due to the reduction of the contact area of the serration portion.

  Further, according to the steering device disclosed in Patent Document 2, since the outer shaft is elastically tightened by the spring force of the ring spring, there is a limitation in increasing the tightening force.

  Accordingly, an object of the present invention is to improve the contact state between the shaft-shaped rotating member and the yoke of the universal joint, and to suppress the wear of the serration portion, and the rotating device and the universal joint. It is to provide a bonding structure.

  In order to achieve the above object, the present invention provides a universal joint having a yoke coupled to an end of a shaft-shaped first rotary member, and a second rotation connected to the first rotary member via the universal joint. And a steering device coupling device for transmitting a rotational force for operating a steering mechanism for turning the steered wheels to the steering mechanism, wherein the yoke is fitted into the first rotary member. A main body having a fitting hole and a fitting portion formed with first and second slits extending in an axial direction of the first rotating member from an opening end of the fitting hole; and the fitting of the main body An encircling member arranged so as to surround the portion, and a pressing member that presses a pressed portion between the first and second slits in the fitting portion by screwing to the encircling member. The member is fitted by the reaction force of the pressing force of the pressing member. The pressing from the opposite side to the pressing member, to provide a coupling device of the steering system.

  In order to achieve the above object, the present invention provides a coupling structure of a shaft-shaped rotating member and a universal joint having a yoke coupled to an end of the rotating member, wherein the yoke includes the rotating member. A body having a fitting hole in which the first and second slits are formed extending from the opening end of the fitting hole to the axial direction of the rotating member; An enclosing member disposed so as to surround the fitting portion; and a pressing member that presses a pressed portion between the first and second slits in the fitting portion by screwing to the enclosing member. The surrounding member provides a coupling structure of a rotating member and a universal joint that presses the fitting portion from the opposite side of the pressing member by a reaction force of the pressing force of the pressing member.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the contact state of a shaft-shaped rotation member and the yoke of a universal joint, and to suppress wear of a serration part.

The schematic block diagram which shows the steering device provided with the connection device which concerns on the 1st Embodiment of this invention. The perspective view which shows the edge part of the output shaft and pinion shaft of a steering assistance apparatus connected with a connection apparatus and a connection apparatus. The 1st yoke of a coupling device is shown, (a) is a perspective view, (b) is a front view, (c) is a side view, (d) is a bottom view. It is the sectional view on the AA line in FIG. 3 which shows the state by which the pinion shaft was serrated by the fitting hole. The 1st yoke of the connection device concerning a 2nd embodiment of the present invention is shown, (a) is a perspective view, (b) is a front view, (c) is a side view, (d) is a bottom view. FIG. 6 is a cross-sectional view taken along line BB in FIG. 5 showing a state in which the pinion shaft is serrated and fitted into the fitting hole.

[First Embodiment]
FIG. 1 is a schematic configuration diagram showing a steering device provided with a coupling device according to a first embodiment of the present invention. This coupling device is provided in a steering device that transmits the rotation of the steering wheel to the steering mechanism to steer the steered wheels.

(Overall structure of steering device)
The steering device 1 includes a steering wheel 2 that is rotated by a driver, a steering shaft 3 that is fixed at one end, a steering assist device 4 that assists steering by generating assist torque, and a steered wheel 11. A turning mechanism 5 for turning, and a connecting device 6 for transmitting a turning force for operating the turning mechanism 5 to the turning mechanism 5 are provided.

  The steering shaft 3 is rotatably supported inside the steering column 10 and rotates integrally with the steering wheel 2. The steering assist device 4 includes an electric motor and a speed reducer, and applies assist torque corresponding to the steering torque of the steering wheel 2 to the output shaft 41. The steered mechanism 5 includes a pinion shaft 50, rack teeth 51 a that mesh with pinion teeth 50 a provided on the pinion shaft 50, and a rack shaft 51 that extends in the left-right direction of the vehicle. The left and right steered wheels 11 are connected to both ends of the rack shaft 51 via tie rods 12.

  The coupling device 6 includes a first universal joint 7 having a first yoke 61 coupled to an end portion of the pinion shaft 50 and a second yoke 62 coupled to an end portion of the output shaft 41 of the steering assist device 4. And a second universal joint 8 having an intermediate shaft connected to the pinion shaft 50 via the first universal joint 7 and connected to the output shaft 41 of the steering assist device 4 via the second universal joint 8. 60. The pinion shaft 50 and the output shaft 41 of the steering assist device 4 are one aspect of the shaft-shaped first rotating member according to the present invention. The intermediate shaft is an aspect of the second rotating member according to the present invention.

(Configuration of connecting device)
FIG. 2 is a perspective view showing the connecting device 6 and the output shaft 41 and the end of the pinion shaft 50 of the steering assist device 4 connected by the connecting device 6.

  The first universal joint 7 includes a first yoke 61 that is serrated to the pinion shaft 50, a fixed yoke 601 that is fixed to the end 60 a of the intermediate shaft 60 on the pinion shaft 50 side, a fixed yoke 601, And a cross shaft 602 that connects the yoke 61 in a swingable manner. The first yoke 61 includes an enclosing member 65 that applies a tightening force to a serration portion with the pinion shaft 50 and a bolt 66 as a pressing member.

  The second universal joint 8 is configured in the same manner as the first universal joint 7. That is, the second universal joint 8 is fixed to the second yoke 62 serration-fitted to the output shaft 41 of the steering assist device 4 and the end 60b of the intermediate shaft 60 on the output shaft 41 side of the steering assist device 4. The fixed yoke 603, and the cross shaft 604 that connects the fixed yoke 603 and the second yoke 62 so as to be swingable are configured. Similar to the first yoke 62, the second yoke 62 includes a surrounding member 65 that applies a tightening force to a serration portion with the output shaft 41 and a bolt 66 as a pressing member.

  The structure for applying the tightening force to the serration portion of the second yoke 62 and the output shaft 41 is the same as the structure for applying the tightening force to the serration portion of the first yoke 61 and the pinion shaft 50. Hereinafter, a structure for applying a tightening force to the serration portions of the first yoke 61 and the pinion shaft 50 will be described in detail.

(Configuration of the first yoke 61)
3A and 3B show the first yoke 61 of the coupling device 6, wherein FIG. 3A is a perspective view, FIG. 3B is a front view, FIG. 3C is a side view, and FIG. In FIG. 3C, the bolt insertion hole 61a is shown broken.

  The first yoke 61 has a main body 64, a surrounding member 65, and a bolt 66. The main body 64 has a cylindrical fitting portion 611 in which a fitting hole 610 into which the pinion shaft 50 is serrated is formed, and first and second arm portions 612 and 613 that are opposed to each other in a bifurcated manner. . The first and second arm portions 612 and 613 are respectively formed with bearing holes 612a and 613a that rotatably accommodate the shaft portion of the cross shaft 602.

  A serration 610 a is formed on the inner peripheral surface of the fitting hole 610 in the fitting portion 611 in parallel with the axial direction of the pinion shaft 50. The fitting portion 611 has a bolt fastening portion 611b on one side, and a bolt insertion hole 61a is formed in the bolt fastening portion 611b.

The fitting portion 611, a first slit 611c ₁ and a second slit 611c from 611a opening end surface of the fitting hole 610 extending along the axial direction of the pinion shaft 50 ₂ is formed in the bolt 66 toward the first the pressed portion 611d is formed between the slits 611c ₁ and the second slit 611c _2. The pressed portion 611 d can be displaced inward of the fitting hole 610 by receiving a pressing force from the bolt 66. The distance between the first slit 611 c ₁ and the second slit 611 c ₂ , that is, the width of the pressed portion 611 d is, for example, about 1 to 2 times the diameter of the screw portion of the bolt 66. As a result, the bending rigidity of the pressed portion 611d is lowered to such an extent that it can be displaced by the pressing force from the bolt 66. The first and second slits 611c ₁ and 611c ₂ can be formed by cutting, for example.

  The fitting portion 611 has a third slit 614 extending along the axial direction of the pinion shaft 50 from the opening end surface 611a of the fitting hole 610 at a position facing the pressed portion 611d across the fitting hole 610. Is formed. The bolt insertion hole 61 a in the bolt fastening portion 611 b is formed so as to intersect the third slit 614. The bolt insertion hole 61a intersects the third slit 614 at a right angle, and includes a round hole 61b on one side of the third slit 614 and a screw hole 61c on the other side of the third slit 614. The male threaded portion 63a of 63 is screwed into the screw hole 61c.

  The third slit 614 is formed from the inner surface of the fitting hole 610 to the outer surface of the fitting portion 611 in the bolt fastening portion 611 b of the fitting portion 611. The fitting portion 611 is fastened to the pinion shaft 50 by the fastening bolt 63 inserted through the bolt insertion hole 61a so that the width of the third slit 614 is narrowed. The third slit 614 can be formed by cutting, for example.

  The surrounding member 65 has an annular shape that surrounds the fitting portion 611 and is disposed outside the fitting portion 611. A screw hole 65a into which the bolt 66 is screwed is formed in the surrounding member 65 at a position facing the pressed portion 611d. The screw hole 65a is formed so as to penetrate the surrounding member 65 in the radial direction. The bolt 66 is attached to the surrounding member 65 by screwing and presses the pressed portion in the fitting portion 611. The surrounding member 65 abuts against the two corners 611e of the bolt fastening portion 611b of the fitting portion 611 by the reaction force of the pressing force of the bolt 66, and presses the fitting portion 611 from the side opposite to the bolt 66.

(Connection work and connection structure between the first yoke 61 and the pinion shaft 50)
Next, the connecting operation and the connecting structure between the first yoke 61 and the pinion shaft 50 will be described with reference to FIG. 4 is a cross-sectional view taken along line AA in FIG. 3 showing a state in which the pinion shaft 50 is serrated and fitted into the fitting hole 610. FIG.

In this coupling operation, first, the end of the pinion shaft 50 is inserted into the fitting hole 610 of the first yoke 61, and the tightening bolt 63 is tightened to narrow the interval between the third slits 614. Next, the surrounding member 65 is arrange | positioned on the outer side of the fitting part 611, the volt | bolt 66 is tightened, and the pressing force F is given to the to-be-pressed part 611d. As a result, the pressed portion 611d is displaced inward of the fitting hole 610 and presses the pinion shaft 50 toward the bolt fastening portion 611b. Further, when a pressing force is applied to the pressed portion 611d by the bolt 66, the two corner portions 611e of the bolt fastening portion 611b of the fitting portion 611 generate a reaction force R (= F / 2) from the inner peripheral surface of the surrounding member 65. receive. Thereby, the serration 610a of the fitting hole 610 meshes with the male serration 501 of the pinion shaft 50 at least at three points P _{1 to} P ₃ indicated by a one-dot chain line in FIG. As described above, the first yoke 61 and the pinion shaft 50 are coupled (fixed).

(Effects of the first embodiment)
According to the embodiment described above, the following effects can be obtained.

(1) Since the serrations 610a of the fitting holes 610 mesh with the male serrations 501 of the pinion shaft 50 in at least three places, a necessary contact area is ensured in the serration portion that fits the first yoke 61 and the pinion shaft 50. It is possible to suppress wear of the serration portion. Thereby, the durability of the coupling device 6 is increased.

(2) Since the pressed portion 611d can be displaced inward of the fitting portion 611 under the pressing force of the bolt 66, the male serration 501 of the pinion shaft 50 can be reliably secured to the serration 610a on the inner surface of the pressed portion 611a. Can be pressed against.

(3) Since the fitting portion 611 is tightened by the tightening bolt 63 so that the width of the third slit 614 becomes narrow, the surface pressure at the points P ₂ and P ₃ shown in FIG. balance between surface pressure the pressed portion 611d which receives the pressing force at the point P ₁ in contact with the pinion shaft 50 is optimized.

(4) Since the surrounding member 65 is annular, its molding is easy. Further, the inner surface of the surrounding member 65 can be appropriately brought into contact with the two corner portions 611e of the bolt fastening portion 611b by the reaction force of the pressing force of the bolt 66.

[Second Embodiment]
FIG. 5 shows a first yoke 61 of a coupling device 6 according to a second embodiment of the present invention, where (a) is a perspective view, (b) is a front view, (c) is a side view, and (d). ) Is a bottom view. In FIG.5 (d), a part of eccentric cam is fractured | ruptured and shown. In the first embodiment, the annular surrounding member 65 and the bolt 66 are used as the members for fastening the pinion shaft 50. However, in this embodiment, the rectangular surrounding member 67 and the eccentricity as the pressing member are used. A cam 68 is used. The following description will focus on differences from the first embodiment.

(Configuration of the first yoke 61)
The first yoke 61 has a main body 64, an enclosing member 67, and an eccentric cam 68 attached to the enclosing member 67. The main body 64 includes a substantially rectangular fitting portion 611 in which a fitting hole 610 into which the pinion shaft 50 is serrated and formed, and first and second arm portions 612 and 613 that are opposed to each other in a bifurcated manner. Yes. A serration 610 a is formed on the inner peripheral surface of the fitting hole 610 in parallel with the axial direction of the pinion shaft 50.

  In the fitting portion 611, first and second slits 615a and 615b extending in the axial direction from the opening end surface 611a of the fitting hole 610 are formed at positions facing each other through the fitting hole 610. A portion closer to the eccentric cam 68 than the first and second slits 615a and 615b of the fitting portion 611 is a pressed portion 611d, and a pressing force is applied from the eccentric cam 68 to a central portion of the pressed portion 611d.

  The surrounding member 67 has a rectangular surrounding portion 670 that surrounds the fitting portion 611 with a gap in part, and a pair of opposing end portions 671 and 672 provided to face the end portion of the surrounding portion 670. And have. Reamed holes 671a and 672a are formed in the opposed end portions 671 and 672, respectively.

(Configuration of the eccentric cam 68)
The eccentric cam 68 includes a cylindrical cam 680 having a reamer hole 680a formed at an eccentric position, a reamer bolt 681 fitted into the reamer hole 680a, a set screw 682 for fixing the cam 680 to the reamer bolt 681, and a reamer bolt 681. And a nut 683 screwed into the screw portion 681c. A screw hole 680b reaching the reamer hole 680a is formed in a part of the cam 680. The reamer bolt 681 includes a hexagonal head 681a, a reamer hole 680a of the cam 680, a reamer part 671a and a reamer hole 671a, 672a of the surrounding member 67, and a screw part 681c formed on the distal end side of the reamer part 681b. And a plane portion 681d formed in the reamer portion 681b.

  When assembling, the cam 680 is disposed between the opposing ends 671 and 672 of the surrounding member 67, and the reamer bolt 681 is connected to the reamer hole 671a of the opposing end 671, the reamer hole 680a of the cam 680, and the reamer hole of the opposing end 672. The set screw 682 is screwed into the screw hole 680b of the cam 680, and the tip of the set screw 682 is pressed against the flat portion 681d of the reamer bolt 681. Thereby, the cam 680 and the reamer bolt 681 are integrated.

(Connection work and connection structure between the first yoke 61 and the pinion shaft 50)
Next, the connecting operation and the connecting structure between the first yoke 61 and the pinion shaft 50 will be described with reference to FIG. 6 is a cross-sectional view taken along line BB in FIG. 5 showing a state in which the pinion shaft 50 is serrated and fitted into the fitting hole 610.

In this coupling operation, first, the pinion shaft 50 is inserted into the fitting hole 610 of the first yoke 61, the hexagon head 681a of the reamer bolt 681 of the eccentric cam 68 is turned and tightened, and the pressing force F is applied from the cam 680 to the pressed portion. To 611d. When the rotational position of the cam 680 is determined, the nut 683 is screwed into the screw portion 681c to fix the rotation of the eccentric cam 68. Thereby, the pinion shaft 50 receives the pressing force F and also receives the reaction force R from the inner surface 670a of the surrounding portion 670 facing the pressed portion 611d. Thus, the first and second slits 615a, the width of 615b is narrowed, at least in FIG. 5, the serrations 610a of the fitting hole 610 of the pinion shaft 50 at point _P 4 to P ₇ of four locations indicated by the dashed line Engages with male serration 501. As described above, the first yoke 61 and the pinion shaft 50 are coupled (fixed).

(Effect of the second embodiment)
According to the embodiment described above, the following effects can be obtained.

(1) Since the end portion of the pinion shaft 50 on which the male serration 501 is formed is clamped so as to be sandwiched by the fitting portions 611 from both sides of the first and second slits 615a and 615b, a necessary contact area is secured in the serration portion. It becomes possible to suppress wear.

(2) Since the eccentric cam 68 is used as the pressing member, a large tightening allowance can be secured with a simple configuration.

  As mentioned above, although the coupling device of the steering device of the present invention has been described based on the above-described embodiment, the present invention is not limited to the above-described embodiment, and in various modes without departing from the gist thereof. It is possible to implement.

  In the first embodiment, the bolt fastening portion 611b is fastened with the fastening bolt 63. However, when the fastening with the bolt 66 provides a sufficient fastening force to the serration portion, the fastening bolt 63 or the third fastening bolt 63 is used. The slit 614 may be omitted.

  In the first embodiment, the annular surrounding member 65 is used, but an surrounding member having another shape such as a rectangular shape may be used. In the second embodiment, the rectangular surrounding member 67 is used, but an annular surrounding member may be used.

  In the first embodiment, the bolt 66 is used as the pressing member. However, an eccentric cam as in the second embodiment may be used. In the second embodiment, the eccentric cam 68 is used as the pressing member. However, a bolt as in the first embodiment may be used.

  In the first and second embodiments, the connection between the first yoke and the pinion shaft has been described. However, the present invention is not limited to this, and the second yoke and the output shaft 41 of the steering assist device 4 are connected. The present invention can also be applied when connecting. The present invention can also be applied to the case where the fixed yoke and the intermediate shaft are connected. Furthermore, the present invention can also be applied to the coupling of the rotating member and the universal joint in a device other than the steering device.

DESCRIPTION OF SYMBOLS 1 ... Steering device, 2 ... Steering wheel, 3 ... Steering shaft, 4 ... Steering assistance device, 5 ... Steering mechanism, 6 ... Connection device, 7 ... 1st universal joint, 8 ... 2nd universal joint, 10 ... Steering column, 11 ... steered wheel, 12 ... tie rod, 41 ... output shaft, 50 ... pinion shaft, 50a ... pinion, 51 ... rack shaft, 51a ... rack, 60 ... intermediate shaft, 60a ... end, 60b ... end, 61 ... first yoke, 61a ... bolt insertion hole, 61b ... round hole, 61c ... screw hole, 62 ... second yoke, 62a ... bolt insertion hole, 63 ... tightening bolt, 64 ... main body, 65 ... enclosure member , 65a ... Screw hole, 66 ... Bolt, 67 ... Enclosure member, 68 ... Eccentric cam, 501 ... Male serration, 601 ... Fixed yoke, 602 ... Cross shaft, 603 ... Fixed yoke, 604 ... Cross shaft, 610 Fitting hole, 610a ... serration, 611 ... fitting portion, 611a ... opening end face, 611b ... bolt fastening portion, 611c 1 _... first slit, 611c 2 _... second slit, 611d ... pressed portion, 611e ... corner , 612 ... arm part, 612 ... first arm part, 613 ... second arm part, 612a, 613a ... bearing hole, 614 ... first slit, 615a ... first slit, 615b ... second slit , 620 ... fitting hole, 620 a ... serration, 670 ... surrounding portion, 670 a ... inner surface, 671, 672 ... opposite end, 671 a, 672 a ... reamer hole, 680 ... cam, 680 a ... reamer hole, 680 b ... screw hole, 681 ... Reamer bolt, 681a ... Hex head, 681b ... Reamer part, 681c ... Screw part, 681d ... Flat part, 682 ... Set screw, 683 ... Nut , F ... _{pressure, P} 1 -P 7 _... points, R ... reaction force

Claims (6)

A universal joint having a yoke coupled to an end portion of a shaft-shaped first rotating member, and a second rotating member connected to the first rotating member via the universal joint, and steered wheels. A steering device coupling device for transmitting a rotational force for operating a steering mechanism to the steering mechanism,
The yoke is
A fitting hole in which the first rotating member is fitted, and a fitting portion in which first and second slits extending in the axial direction of the first rotating member from the opening end of the fitting hole are formed. A body having;
An enclosing member disposed so as to surround the fitting portion of the main body;
A pressing member attached to the surrounding member and pressing a pressed portion between the first and second slits in the fitting portion;
The surrounding member presses the fitting portion from the side opposite to the pressing member by a reaction force of the pressing force of the pressing member.
Steering device coupling device. The fitting portion of the yoke is formed such that the first and second slits are formed closer to the pressing member, and the pressed portion is configured to be displaced inward of the fitting hole by receiving the pressing force. The
The coupling device for a steering apparatus according to claim 1. In the fitting portion, a third slit extending in the axial direction from the opening end is formed at a position facing the pressed portion with the fitting hole interposed therebetween, and the third slit is formed in the third slit. Intersecting bolt insertion holes are formed,
The fitting portion is fastened to the first rotating member such that the width of the third slit is narrowed by a fastening bolt inserted through the bolt insertion hole,
The coupling device for a steering apparatus according to claim 2. The surrounding member is an annular shape surrounding the fitting portion,
The pressing member is a bolt screwed into a screw hole formed through the surrounding member.
The coupling device for a steering apparatus according to any one of claims 1 to 3. The pressing member is an eccentric cam that rotates between the pair of slits of the fitting portion by rotating.
The coupling device for a steering apparatus according to claim 1 or 2. A coupling structure of a shaft-shaped rotating member and a universal joint having a yoke coupled to an end of the rotating member,
The yoke is
A main body having a fitting hole in which the rotating member is fitted, and a fitting portion in which first and second slits extending in the axial direction of the rotating member from the opening end of the fitting hole are formed;
An enclosing member disposed so as to surround the fitting portion of the main body;
A pressing member attached to the surrounding member and pressing a pressed portion between the first and second slits in the fitting portion;
The surrounding member presses the fitting portion from the opposite side of the pressing member by a reaction force of the pressing force of the pressing member.
Coupling structure of rotating member and universal joint.

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