JP5223914B2 - Universal assembly misassembly prevention tool - Google Patents

Description

  The present invention relates to a universal joint, and more particularly to a misassembly prevention tool for a universal joint that connects shafts that transmit rotation 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.

  The movement of the steering wheel is transmitted to the steering gear via a steering shaft and an intermediate shaft that are rotatably provided in the steering column, and the direction of the wheel is steered by the steering gear. Usually, the steering shaft and the input shaft of the steering gear cannot be provided on the same straight line.

  For this reason, conventionally, an intermediate shaft is provided between the steering shaft and the input shaft to the steering gear, the end of the intermediate shaft and the steering shaft, and the end of the intermediate shaft and the end of the input shaft of the steering gear. Are coupled via a universal joint so that power can be transmitted between the steering shaft and the input shaft that do not exist on the same straight line.

  Such a universal joint includes a coupling cylinder part having an inner peripheral surface for fitting a shaft, and a pair provided integrally with the coupling cylinder part across a slit penetrating the inner peripheral surface of the coupling cylinder part. The flange part is provided. Then, by bolting the bolt into the bolt hole formed in the flange portion, the inner peripheral surface of the coupling tube portion is reduced in diameter, and the outer peripheral surface of the shaft is tightened and fixed by the inner peripheral surface of the coupling tube portion. Like to do.

  In addition, a substantially U-shaped recess is formed at a predetermined position in the axial direction on the outer periphery of the shaft. When the bolt is inserted through the recess, the shaft outer periphery of the bolt becomes the recess It abuts to prevent the shaft from coming out of the coupling cylinder.

  When the amount of shaft insertion into the coupling cylinder is insufficient and the shaft has not reached the normal position, the bolt tip cannot interfere with the shaft, preventing the bolt from being inserted into the screw hole side of the bolt hole. . This prevents erroneous assembly in which a shaft that is not in the normal position is assembled to the coupling cylinder portion. However, in a state where the tip of the shaft does not reach the position of the bolt, the shaft may allow the bolt to be inserted, and in this case, there is a problem that erroneous assembly occurs.

  The universal joint misassembly prevention tool shown in Patent Document 1 is formed as a whole by an integrated sheet metal, the fixing part at one end is fixed to the bolt hole by the fixing tool, and the other end is bent and entered into the slit to prevent it. Forming part. This blocking part is elastically deformed by being pushed at the tip of the shaft inserted into the coupling cylinder part, and is displaced from a blocking position where the bolt can be blocked from being inserted into the bolt hole to a release position where the blocking is released. To do.

  The universal assembly misassembly prevention tool shown in Patent Document 1 requires a fixture for fixing the misassembly prevention tool to the universal joint, and thus the number of parts increases and the manufacturing cost increases. Further, since the blocking portion is elastically deformed while being twisted in a complicated manner with the fixed portion as a fulcrum, the force required to elastically deform the blocking portion is increased, and the insertion resistance when the shaft is inserted into the coupling cylinder portion is large.

JP 2006-226415 A

  An object of the present invention is to provide a misassembly preventer for a universal joint that has a small number of parts, can reduce manufacturing costs, and has a low insertion resistance when a shaft is inserted into a coupling cylinder portion.

The above problem is solved by the following means. That is, the first invention is a coupling cylinder part provided with an inner peripheral surface for fitting a shaft so as to be able to transmit rotational torque, a slit formed in the coupling cylinder part and penetrating through the inner peripheral surface, A pair of flange portions provided integrally with the coupling cylinder portion with a slit interposed therebetween, a pair of arm portions provided integrally with the coupling cylinder portion and having a bearing hole for supporting a cross shaft, and the flange portion A bolt shaft portion is fitted into the formed bolt hole, the slit interval between the pair of flange portions is narrowed, the inner peripheral surface of the coupling cylinder portion is reduced in diameter, and the outer peripheral surface of the shaft is coupled to the coupling cylinder. Used for assembling a universal joint with a bolt that is tightened on the inner peripheral surface of the part, and for preventing the shaft from being fixed to the coupling cylinder part in a state where it is not inserted into the normal position in the axial direction of the coupling cylinder part a preventer erroneous assembly, surrounds the outer peripheral surface of the coupling tubular portion Outer circumferential surface surrounding portion fitted with interference fit with the outer peripheral surface, is formed on the outer circumferential surface surrounding portion, abutting the end face abutment on the end face of the counter-arm side of the coupling tubular portion, of the outer circumferential surface surrounding portion arm Formed on the slit-side extension extending toward the portion , formed on the slit side of the outer peripheral surface surrounding portion, holding nail portion for gripping at least one of the pair of arm portions, and enters the slit to join the coupling A bolt insertion blocking portion that is elastically deformable at a release position that releases the blocking from a blocking position that blocks the bolt from being inserted through the bolt hole by being pushed at the tip of the shaft inserted into the cylinder portion, and A misassembly prevention tool for a universal joint, characterized in that the misassembly prevention tool is entirely formed of an integral resin.

  According to a second aspect of the present invention, there is provided a universal joint preventing assembly according to the first aspect of the invention, wherein the outer peripheral surface surrounding portion is fitted into the outer peripheral surface of the coupling cylinder portion with an interference fit. It is a misassembly prevention tool.

  According to a third aspect of the present invention, there is provided the universal joint misassembly prevention device according to the first aspect, wherein the gripping claw portion includes a first gripping claw portion that grips one of the pair of arm portions, and the pair of pairs. A misjoint prevention tool for a universal joint having a second gripping claw for gripping the other of the arm portions.

  According to a fourth aspect of the present invention, there is provided a universal joint misassembly prevention device according to the first invention, wherein the gripping claw portion abuts against an end surface of the coupling cylinder portion on the arm portion side and the axial direction of the misassembly prevention device. It is a misassembly prevention tool of a universal joint characterized by restricting a position.

  According to a fifth aspect of the present invention, there is provided a universal joint misassembly prevention device according to the first aspect, wherein a notch groove is formed at the base of the gripping claw part, and the gripping claw part is elastically formed at the base near the notch groove. A universal joint misassembly prevention tool, wherein the arm part is deformed and gripped by a gripping claw part.

  According to a sixth aspect of the present invention, in the universal joint preventive assembly tool of the first aspect, the base width of the bolt insertion blocking portion is formed to be small, and the bolt insertion blocking portion is elastically deformed at the base having the small width. This is a misassembly prevention tool for universal joints.

  According to a seventh aspect of the present invention, there is provided a universal joint preventive assembly tool according to the first aspect of the present invention, wherein an engagement protrusion formed on the outer peripheral surface of the coupling cylinder portion so as to protrude radially outward, and the outer peripheral surface surrounding portion. And an engagement groove for engaging the engagement protrusion and restricting the axial movement of the assembly error prevention tool.

  The universal joint misassembly prevention device of the present invention is formed on the outer peripheral surface surrounding portion and the outer peripheral surface surrounding portion that surround the outer peripheral surface of the coupling cylinder portion, and the end surface abutting against the end surface of the coupling cylinder portion on the side opposite to the arm portion. Formed in the contact portion, outer peripheral surface surrounding portion, formed on the slit side of the outer peripheral surface surrounding portion, the gripping claw portion that grips at least one of the pair of arm portions, entered into the slit, and inserted into the coupling cylinder portion A bolt insertion blocking portion that can be elastically deformed from a blocking position that prevents the bolt from being inserted into the bolt hole by being pushed at the tip of the shaft is provided at the release position to release the blocking. It is formed of an integral resin. Therefore, the number of parts is small, the manufacturing cost can be reduced, and the insertion resistance when the shaft is inserted into the coupling cylinder portion can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall side view of a steering apparatus including a universal joint that incorporates a misassembly prevention tool according to an embodiment of the present invention. The universal joint incorporating the incorrect assembly prevention tool of Example 1 of this invention is shown, (a) is a front view, (b) is a right view of (a). FIG. 3 is a bottom view of FIG. It is a perspective view of the universal joint incorporating the incorrect assembly prevention tool of Example 1 of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an erroneous assembly prevention tool according to a first embodiment of the present invention, (b) is a right side view of (a), and (c) is a bottom view of (a). It is a perspective view of the incorrect assembly prevention tool of Example 1 of the present invention. The universal joint single-piece | unit incorporating the incorrect assembly prevention tool of Example 1 of this invention is shown, (a) is a front view, (b) is a right view of (a), (c) is a bottom view of (a). is there. It is AA sectional drawing of Fig.7 (a). It is a longitudinal cross-sectional view which shows the state in the middle of inserting a axis | shaft in the universal joint incorporating the incorrect assembly prevention tool of Example 1 of this invention. It is a longitudinal cross-sectional view which shows the state which inserted the axis | shaft in the universal joint incorporating the incorrect assembly prevention tool of Example 1 of this invention, and the axis | shaft reached the regular position. The universal joint incorporating the incorrect assembly prevention tool of Example 2 of this invention is shown, (a) is a front view, (b) is a right view of (a). It is a perspective view of the universal joint incorporating the incorrect assembly prevention tool of Example 2 of the present invention. The misassembly prevention tool single-piece | unit of Example 2 of this invention is shown, (a) is a front view, (b) is a right view of (a). It is a perspective view of the incorrect assembly prevention tool of Example 2 of the present invention. It is a perspective view of the universal joint incorporating the incorrect assembly prevention tool of Example 3 of the present invention. It is a perspective view of the incorrect assembly prevention tool of Example 3 of the present invention. The universal joint single-piece | unit incorporating the incorrect assembly prevention tool of Example 3 of this invention is shown, (a) is a front view, (b) is a bottom view of (a).

  Examples 1 to 3 of the present invention will be described below.

  Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is an overall side view of a steering apparatus provided with a universal joint incorporating a misassembly prevention device according to an embodiment of the present invention. As shown in FIG. 1, a steering apparatus having a universal joint incorporating a misassembly prevention device according to an embodiment of the present invention has 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 an 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.

  The cylindrical steering column 13 inserted through the steering shaft 12 combines an outer column 13A and an inner column 13B so as to be telescopically movable. Therefore, the steering column 13 has a so-called collapsible structure in which, when an impact in the axial direction is applied during a collision, the entire length is reduced while absorbing energy due to the impact.

  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.

  FIGS. 2 to 4 show a universal joint incorporating the misassembly prevention device according to the first embodiment of the present invention, and an example in which the universal joint 5 shown in FIG. Show. 2A and 2B show a universal joint into which a misassembly prevention device according to Embodiment 1 of the present invention is incorporated, in which FIG. 2A is a front view and FIG. 2B is a right side view of FIG. FIG. 3 is a bottom view of FIG. FIG. 4 is a perspective view of a universal joint incorporating the misassembly prevention device of Embodiment 1 of the present invention. The misassembly prevention tool according to the first embodiment of the present invention may be applied to a coupling portion between the universal joint 4 and the male intermediate shaft 15 </ b> A in FIG. 1 or a coupling portion between the universal joint 4 and the output shaft 23.

  7A and 7B show a universal joint unit incorporating the misassembly prevention device according to the first embodiment of the present invention, where FIG. 7A is a front view, FIG. 7B is a right side view of FIG. 7A, and FIG. It is a bottom view. FIG. 8 is a cross-sectional view taken along the line AA in FIG. As shown in FIGS. 7 and 8, the yoke 51 of the universal joint according to the first embodiment of the present invention has bifurcated arm portions 52, 52, and the circular holes 521 formed in the arm portions 52, 52. A cross shaft (not shown) is inserted into the shaft 521 through a bearing, and the other yoke 51 (not shown) is coupled through the cross shaft.

  A cylindrical coupling cylinder portion 53 is formed in the yoke 51, and an axis (pinion shaft) is formed on the inner peripheral surface 531 of the coupling cylinder portion 53 from the left side of FIG. 7A in parallel to the axial direction of the coupling cylinder portion 53. ) 6 is inserted. Then, the flat surfaces 61 and 61 (see FIGS. 2 and 3) formed to face the outer peripheral surface of the shaft 6 are engaged with the flat surfaces 532 and 532 formed on the inner peripheral surface 531, so that the rotational torque is increased. Can be transmitted.

  The coupling cylinder part 53 of the yoke 51 is formed with a pair of left and right flange parts 54A and 54B extending in a tangential direction from the coupling cylinder part 53. A slit (cut) 56 communicating with the inner peripheral surface 531 is formed between the flange portions 54A and 54B.

  A bolt hole 541 for inserting the bolt shaft portion 551 of the bolt 55 is formed in one flange portion 54A. Further, a female screw 542 for screwing a male screw 552 of the bolt 55 is formed concentrically with the bolt hole 541 in the other flange portion 54B.

  When the shaft 6 is inserted into the inner peripheral surface 531 of the coupling cylinder portion 53, the bolt 55 is inserted into the bolt hole 541 from the right side of FIG. 8, and the male screw 552 is screwed into the female screw 542, the flange portions 54A and 54B are elastically deformed. Thus, the groove width of the slit 56 is narrowed, and the outer peripheral surface of the shaft 6 can be strongly tightened and fixed by the inner peripheral surface 531 of the coupling tube portion 53.

  A substantially U-shaped recess (see FIGS. 2 and 3) 62 is formed on the outer peripheral surface of the shaft 6. If the shaft 6 has reached the normal position in the axial direction of the coupling cylinder portion 53, the bolt shaft portion 551 passes through the recess 62. Therefore, when the shaft 6 is about to come out of the coupling cylinder portion 53, the outer periphery of the bolt shaft portion 551 is brought into contact with the recess 62, thereby preventing the shaft 6 from coming out of the coupling cylinder portion 53.

  The misassembly prevention tool 7 shown in FIGS. 5 and 6 is incorporated into the above-described universal joint yoke 51 to obtain the state shown in FIGS. The misassembly prevention tool 7 is entirely formed of an integral resin. As shown in FIGS. 5 and 6, the misassembly prevention tool 7 includes an outer peripheral surface surrounding portion 71, a first gripping claw portion 72, and a bolt insertion prevention portion 73.

  The outer peripheral surface surrounding portion 71 has an inner peripheral surface 711 that fits around the outer peripheral surface (see FIGS. 7 and 8) 533 of the coupling cylinder portion 53 of the yoke 51. When the outer peripheral surface surrounding portion 71 of the misassembly prevention tool 7 is inserted into the coupling cylinder portion 53 from the end surface (see FIG. 7A) 534 side of the coupling cylinder portion 53 on the opposite arm portion side, the inner circumferential surface 711 The outer peripheral surface 533 is surrounded by being fitted on the surface 533.

  The width (length in the left-right direction in FIG. 5B) B1 of the inner peripheral surface 711 is slightly shorter than the width (length in the left-right direction in FIG. 8) B2 of the coupling cylinder portion 53. Accordingly, when the inner peripheral surface 711 of the outer peripheral surface surrounding portion 71 is externally fitted to the outer peripheral surface 533 of the coupling cylinder portion 53, the inner peripheral surface 711 is fitted to the outer peripheral surface 533 with an interference fit. It becomes difficult to drop off from the coupling cylinder portion 53.

  The outer peripheral surface surrounding portion 71 has a slit side extending toward the arm portion 52 (toward the right side in FIG. 5A) along the outer peripheral surface 533 of the coupling cylinder portion 53 on the slit 56 side of the coupling cylinder portion 53. An extension 74 is formed. An R concave surface (end surface abutting portion) 741 is formed on the slit-side extension portion 74 at the connection portion with the outer peripheral surface surrounding portion 71. An R convex surface (see FIG. 7A) 535 is formed on the slit 56 side of the end surface 534 of the coupling cylinder portion 53 on the side opposite to the arm portion. As shown in FIG. 2A, when the outer peripheral surface surrounding portion 71 is inserted into the coupling cylinder portion 53, the R concave surface 741 of the misassembly prevention tool 7 abuts on the R convex surface 535 of the coupling cylinder portion 53, and erroneous assembly is performed. The position of the preventer 7 in the axial direction is restricted.

  The outer circumferential surface surrounding portion 71 has an arc shape extending toward the arm portion 52 (to the right side in FIG. 5A) along the outer circumferential surface 533 of the coupling cylinder portion 53 on the opposite slit side of the coupling cylinder portion 53. The anti-slit side extension 75 is formed. Therefore, the misassembly prevention tool 7 sandwiches the coupling cylinder part 53 from both sides of the coupling cylinder part 53 in the vertical direction (vertical direction in FIG. 2A) by the slit side extension part 74 and the anti-slit side extension part 75.

  The slit-side extension 74 has first gripping claws 72, 72 that extend toward the axis of the coupling cylinder 53 (upward in FIG. 5A) at the end on the arm 52 side. Is formed. Cutout grooves 721 and 721 are formed at the bases of the first gripping claws 72 and 72. When the first gripping claw portions 72 and 72 are pushed into the arm portion 52 on the slit 56 side from the slit 56 side, the first gripping claw portions 72 and 72 are elastically deformed at the bases near the notch grooves 721 and 721. The space between the arm portions 52 and 52 is widened, and the arm portion 52 is gripped by the first gripping claw portions 72 and 72.

  Engagement protrusions 722 and 722 are formed at the upper ends of the first gripping claws 72 and 72 and are bent into an L shape toward the center in the width direction of the coupling cylinder portion 53. On the upper surfaces of the engagement protrusions 722 and 722, inclined surfaces 723 and 723 are formed. The inclined surfaces 723 and 723 are formed in a shape that descends from the outer side in the width direction of the coupling cylinder portion 53 toward the center. An engagement surface 724 that engages with the inner surface (see FIGS. 7A and 7B) 522 of the arm portion 52 is formed on the lower surfaces of the engagement protrusions 722 and 722.

  Accordingly, when the first gripping claw portions 72 and 72 are pushed into the arm portion 52 on the slit 56 side from the slit 56 side, the inclined surfaces 723 and 723 of the engaging protrusions 722 and 722 are formed on the outer surface 523 of the arm portion 52. Abut. Further, when the first gripping claws 72 and 72 are pushed into the arm portion 52, the first gripping is performed at the roots near the notch grooves 721 and 721 by the component force on the inclined surfaces 723 and 723 outward in the width direction. Since the claw portions 72 and 72 are elastically deformed and the interval between the engagement protrusions 722 and 722 is widened, the engagement protrusions 722 and 722 are pushed into the inner surface 522 side of the arm portion 52.

  When the engagement protrusions 722 and 722 reach the inner surface 522 of the arm portion 52, the elastic deformation of the first gripping claw portions 72 and 72 is restored, and the interval between the engagement protrusions 722 and 722 is reduced. The mating surfaces 724 and 724 engage with the inner surface 522 of the arm portion 52.

  Therefore, the end portion on the arm portion 52 side of the slit-side extension portion 74 is locked to the arm portion 52 by the engagement protrusions 722 and 722. As a result, even if a downward force in FIG. 2A is applied to the slit-side extension 74, the erroneous assembly preventing tool 7 is unlikely to come off the yoke 51.

  The inner surface 522 of the arm portion 52 and the end surface 536 on the arm portion side of the coupling cylinder portion 53 are smoothly connected by an R concave surface 537. The engaging protrusions 722 and 722 are engaged with the inner side surface 522 in the vicinity of the connection portion between the R concave surface 537 and the inner side surface 522. Therefore, even if the leftward force in FIG. 2A is applied to the misassembly prevention tool 7, the engagement protrusions 722 and 722 abut against the R concave surface 537, and the axial position of the misassembly prevention tool 7 is restricted. To do.

  In the slit side extension portion 74, a bolt insertion blocking portion 73 is formed at the center portion in the width direction of the slit side extension portion 74. The bolt insertion preventing portion 73 extends from the vicinity of the connection portion with the outer peripheral surface surrounding portion 71 toward the axial center of the coupling cylinder portion 53 (upward in FIG. 5A), and within the slit 56 of the coupling cylinder portion 53. Enter. The bolt insertion preventing portion 73 is formed in a plate shape parallel to the slit 56 and thinner than the groove width of the slit 56.

  The bolt insertion preventing portion 73 is formed so that the width of the root 731 is small, and the bolt insertion preventing portion 73 is elastically deformed at the root 731 having the small width. Accordingly, the bolt insertion preventing portion 73 is easily elastically deformed at the base 731 having a reduced rigidity so that the root 731 is not broken when the bolt insertion preventing portion 73 is elastically deformed. The bolt insertion blocking portion 73 has a wide bolt insertion blocking surface 732 formed on the upper side. The slit-side extension portion 74 is formed with a notch groove 76 around the bolt insertion prevention portion 73 so that the bolt insertion prevention portion 73 enters the slit-side extension portion 74 when the bolt insertion prevention portion 73 is elastically deformed. Allowed.

  As described above, the erroneous assembly prevention tool 7 according to the first embodiment of the present invention does not require an assembly tool, and can be incorporated into the yoke 51 simply by pressing the erroneous assembly prevention tool 7 against the yoke 51. Assembly time is shortened. In addition, since only the resin misassembly prevention tool 7 is required, the manufacturing cost can be reduced. Further, since the misassembly prevention tool 7 according to the first embodiment of the present invention is entirely formed of an integral resin, it is lighter than a sheet metal, has a low risk of injury during assembly, and is used repeatedly. Excellent durability.

  After incorporating the misassembly prevention tool 7 of Example 1 of the present invention into the yoke 51, the shaft 6 is inserted into the inner peripheral surface 531 of the coupling cylinder portion 53 in parallel to the axial direction. FIG. 9 is a longitudinal sectional view showing a state in the middle of inserting the shaft 6 into the yoke 51 incorporating the erroneous assembly preventing tool 7. As shown in FIG. 9, when the misassembly prevention tool 7 is incorporated into the yoke 51, the bolt insertion blocking surface 732 of the bolt insertion blocking portion 73 covers the female screw 542. Therefore, as shown in FIG. 9, when the insertion amount of the shaft 6 into the inner peripheral surface 531 of the coupling cylinder portion 53 is insufficient and the shaft 6 does not reach the normal position, the bolt insertion prevention surface 732 is obstructed. Thus, the male screw 552 of the bolt 55 cannot be screwed into the female screw 542.

  When the shaft 6 is further inserted into the inner peripheral surface 531 from the state of FIG. 9, the tip 63 of the shaft 6 comes into contact with the upper end 733 of the bolt insertion blocking portion 73, and the bolt insertion blocking portion 73 uses the root 731 as a fulcrum. Elastically deforms in the direction. Since the bolt insertion preventing portion 73 is elastically deformed parallel to the slit 56 of the coupling cylinder portion 53, a force required to elastically deform the bolt insertion preventing portion 73 is small, and the shaft 6 is inserted into the inner peripheral surface 531. Insertion resistance is small. FIG. 10 is a longitudinal sectional view showing a state where the shaft 6 has reached the normal position. When the shaft 6 reaches the normal position, the bolt insertion blocking surface 732 of the bolt insertion blocking portion 73 is completely removed from the female screw 542.

  Accordingly, the male screw 552 of the bolt 55 can be screwed into the female screw 542. Further, since the shaft 6 has reached the normal position in the axial direction of the coupling cylinder portion 53, the bolt shaft portion 551 of the bolt 55 is inserted through the recess 62 of the shaft 6. Therefore, when the shaft 6 is about to come out of the coupling cylinder portion 53, it is possible to prevent the outer periphery of the bolt shaft portion 551 from coming into contact with the concave portion 62 and the shaft 6 from coming out of the coupling cylinder portion 53.

  Next, a second embodiment of the present invention will be described. 11A and 11B show a universal joint in which a misassembly prevention tool according to Embodiment 2 of the present invention is incorporated. FIG. 11A is a front view, and FIG. 11B is a right side view of FIG. FIG. 12 is a perspective view of a universal joint into which a misassembly prevention device according to Embodiment 2 of the present invention is incorporated. FIG. 13 shows an erroneous assembly preventive unit of Embodiment 2 of the present invention, FIG. 13 (a) is a front view, FIG. 13 (b) is a right side view of FIG. 13 (a), and FIG. It is a perspective view of the incorrect assembly prevention tool of Example 2. In the following description, only structural parts different from the above-described embodiment will be described, and redundant description will be omitted. Further, the same parts will be described with the same numbers.

  The second embodiment is an example in which a second gripping claw portion that grips the other arm portion 52 is formed in addition to the first gripping claw portion 72 that grips one of the pair of arm portions 52. That is, as shown in FIGS. 11 to 14, the misassembly prevention tool 7 of the second embodiment is formed of an integral resin as in the first embodiment, and includes the outer peripheral surface surrounding portion 71 and the first grip. It has a claw part 72, a bolt insertion prevention part 73, and a second gripping claw part 77.

  When the outer circumferential surface surrounding portion 71 is inserted into the coupling cylinder portion 53 from the end surface 534 side on the side opposite to the arm portion of the coupling cylinder portion 53, the inner circumferential surface 711 is externally fitted to the outer circumferential surface 533 and surrounds the outer circumferential surface 533.

  The width (length in the left-right direction in FIG. 13B) B1 of the inner peripheral surface 711 is slightly shorter than the width (length in the left-right direction in FIG. 8) B2 of the coupling cylinder portion 53. Accordingly, when the inner peripheral surface 711 of the outer peripheral surface surrounding portion 71 is externally fitted to the outer peripheral surface 533 of the coupling cylinder portion 53, the inner peripheral surface 711 is fitted to the outer peripheral surface 533 with an interference fit. It becomes difficult to drop off from the coupling cylinder portion 53.

  The outer peripheral surface surrounding portion 71 has a slit side extending toward the arm portion 52 (toward the right side in FIG. 13A) along the outer peripheral surface 533 of the coupling cylinder portion 53 on the slit 56 side of the coupling cylinder portion 53. An extension 74 is formed. An R concave surface (end surface abutting portion) 741 is formed on the slit-side extension portion 74 at the connection portion with the outer peripheral surface surrounding portion 71. As shown in FIG. 11A, when the outer peripheral surface surrounding portion 71 is inserted into the coupling cylinder portion 53, the R concave surface 741 of the misassembly prevention tool 7 comes into contact with the R convex surface 535 of the coupling cylinder portion 53, and erroneous assembly is performed. The position of the preventer 7 in the axial direction is restricted.

  The outer circumferential surface surrounding portion 71 has an arc shape extending toward the arm portion 52 (to the right side in FIG. 13A) along the outer circumferential surface 533 of the coupling cylinder portion 53 on the opposite slit side of the coupling cylinder portion 53. The anti-slit side extension 75 is formed. Therefore, the misassembly prevention tool 7 sandwiches the coupling cylinder part 53 from both sides of the coupling cylinder part 53 in the vertical direction (vertical direction in FIG. 11A) by the slit side extension part 74 and the anti-slit side extension part 75.

  The slit-side extension 74 has first gripping claws 72 and 72 that extend toward the axis of the coupling cylinder 53 (upward in FIG. 13A) at the end on the arm 52 side. Is formed. Cutout grooves 721 and 721 are formed at the bases of the first gripping claws 72 and 72. When the first gripping claw portions 72 and 72 are pushed into the arm portion 52 on the slit 56 side from the slit 56 side, the first gripping claw portions 72 and 72 are elastically deformed at the bases near the notch grooves 721 and 721. The space between the arm portions 52 and 52 is widened, and the arm portion 52 is gripped by the first gripping claw portions 72 and 72.

  Engagement protrusions 722 and 722 are formed at the upper ends of the first gripping claws 72 and 72 and are bent into an L shape toward the center in the width direction of the coupling cylinder portion 53. On the upper surfaces of the engagement protrusions 722 and 722, inclined surfaces 723 and 723 are formed. The inclined surfaces 723 and 723 are formed in a shape that descends from the outer side in the width direction of the coupling cylinder portion 53 toward the center. An engagement surface 724 that engages with the inner surface (see FIG. 11) 522 of the arm portion 52 is formed on the lower surfaces of the engagement protrusions 722 and 722.

  Accordingly, when the first gripping claw portions 72 and 72 are pushed into the arm portion 52 on the slit 56 side from the slit 56 side, the inclined surfaces 723 and 723 of the engaging protrusions 722 and 722 are formed on the outer surface 523 of the arm portion 52. Abut. Further, when the first gripping claws 72 and 72 are pushed into the arm portion 52, the first gripping is performed at the roots near the notch grooves 721 and 721 by the component force on the inclined surfaces 723 and 723 outward in the width direction. Since the claw portions 72 and 72 are elastically deformed and the interval between the engagement protrusions 722 and 722 is widened, the engagement protrusions 722 and 722 are pushed into the inner surface 522 side of the arm portion 52.

  When the engagement protrusions 722 and 722 reach the inner surface 522 of the arm portion 52, the elastic deformation of the first gripping claw portions 72 and 72 is restored, and the interval between the engagement protrusions 722 and 722 is reduced. The mating surfaces 724 and 724 engage with the inner surface 522 of the arm portion 52.

  Therefore, the end portion on the arm portion 52 side of the slit-side extension portion 74 is locked to the arm portion 52 by the engagement protrusions 722 and 722. As a result, even if a downward force in FIG. 11A is applied to the slit-side extension portion 74, the misassembly prevention tool 7 is unlikely to come off the yoke 51.

  The inner surface 522 of the arm portion 52 and the end surface 536 on the arm portion side of the coupling cylinder portion 53 are smoothly connected by an R concave surface 537. The engaging protrusions 722 and 722 are engaged with the inner side surface 522 in the vicinity of the connection portion between the R concave surface 537 and the inner side surface 522. Therefore, even if the leftward force in FIG. 11A is applied to the misassembly prevention tool 7, the engagement protrusions 722 and 722 abut against the R concave surface 537 and the axial position of the misassembly prevention tool 7 is restricted. To do.

  Further, the anti-slit side extension 75 has a second gripping claw 77 extending toward the axis of the coupling cylinder 53 (downward in FIG. 13A) at the end on the arm 52 side. , 77 are formed. The shape of the second gripping claw portion 77 is the same as that of the first gripping claw portion 72. That is, notch grooves 771 and 771 are formed at the bases of the second gripping claws 77 and 77. When the second gripping claw portions 77 and 77 are pushed into the arm portion 52 on the anti-slit side from the non-slit side, the second gripping claw portions 77 and 77 are elastically deformed at the roots near the notch grooves 771 and 771. The space between the arm portions 52 and 52 is widened, and the second gripping claw portions 77 and 77 grip the arm portion 52 on the anti-slit side.

  Engagement projections 772 and 772 formed by being bent in an L shape toward the center in the width direction of the coupling cylinder portion 53 are formed at the lower ends of the second gripping claws 77 and 77. Inclined surfaces 773 and 773 are formed on the lower surfaces of the engaging projections 772 and 772. The inclined surfaces 773 and 773 are formed in a shape that rises from the outside in the width direction of the coupling cylinder portion 53 toward the center. An engaging surface 774 that engages with the inner surface (see FIG. 11) 522 of the arm portion 52 on the anti-slit side is formed on the upper surfaces of the engaging protrusions 772 and 772.

  Therefore, when the second gripping claws 77 and 77 are pushed into the arm portion 52 on the anti-slit side from the anti-slit side, the inclined surfaces 773 and 773 of the engagement protrusions 772 and 772 are formed on the arm portion 52 on the anti-slit side. Abuts on the outer surface 523. Further, when the second gripping claw portions 77 and 77 are pushed into the arm portion 52 on the non-slit side, a component force to the outside in the width direction acting on the inclined surfaces 773 and 773 is caused at the root near the notch grooves 771 and 771. Since the second gripping claws 77 and 77 are elastically deformed and the interval between the engaging protrusions 772 and 772 is widened, the engaging protrusions 772 and 772 are pushed into the inner surface 522 side of the arm part 52 on the anti-slit side. .

  When the engaging protrusions 772 and 772 reach the inner surface 522 of the arm part 52 on the anti-slit side, the elastic deformation of the second gripping claw parts 77 and 77 is restored to the original, and the interval between the engaging protrusions 772 and 772 is increased. The engagement surfaces 774 and 774 engage with the inner surface 522 of the arm portion 52 on the anti-slit side.

  Accordingly, the end portion of the anti-slit side extension 75 on the arm portion 52 side is locked to the anti-slit side arm portion 52 by the engagement protrusions 772 and 772. As a result, even if an upward force in FIG. 11A is applied to the anti-slit side extension 75, the misassembly prevention tool 7 is unlikely to come off the yoke 51.

  The inner side surface 522 of the arm portion 52 on the anti-slit side and the end surface 536 on the arm portion side of the coupling cylinder portion 53 are smoothly connected by an R concave surface 537. The engagement protrusions 772 and 772 are engaged with the inner side surface 522 in the vicinity of the connection portion between the R concave surface 537 and the inner side surface 522. Therefore, even if the leftward force in FIG. 11A is applied to the misassembly prevention tool 7, the engagement protrusions 772 and 772 abut against the R concave surface 537, thereby restricting the axial position of the misassembly prevention tool 7. To do.

  In the slit-side extension portion 74, a bolt insertion blocking portion 73 having the same shape as that of the first embodiment is formed in the center portion in the width direction of the slit-side extension portion 74. That is, the bolt insertion preventing portion 73 is formed such that the root 731 has a small width, and a wide bolt insertion preventing surface 732 is formed on the upper side.

  In addition to the effects of the erroneous assembly prevention tool 7 of the first embodiment, the erroneous assembly prevention tool 7 of the second embodiment of the present invention has the following effects. That is, the erroneous assembly preventing tool 7 of the second embodiment includes a first gripping claw portion 72 that engages with the arm portion 52 on the slit side and a second gripping claw portion that engages with the arm portion 52 on the anti-slit side. 77. Therefore, the movement of the misassembly prevention tool 7 in the axial direction and the direction orthogonal to the axial direction is prevented, and the misassembly prevention tool 7 is removed from the yoke 51 only by pressing the misassembly prevention tool 7 against the yoke 51. Can be reliably prevented.

  Next, a third embodiment of the present invention will be described. FIG. 15 is a perspective view of a universal joint into which a misassembly prevention device according to Embodiment 3 of the present invention is incorporated. FIG. 16 is a perspective view of a misassembly prevention tool according to Embodiment 3 of the present invention, FIG. 17 is a single universal joint incorporating the misassembly prevention tool according to Embodiment 3 of the present invention, and FIG. FIG. 17 (b) is a bottom view of FIG. 17 (a). In the following description, only structural parts different from the above-described embodiment will be described, and redundant description will be omitted. Further, the same parts will be described with the same numbers.

  Example 3 is an example in which the engagement groove formed in the misassembly prevention tool 7 is engaged with the engagement protrusion formed in the coupling cylinder portion to restrict the axial movement of the misassembly prevention tool 7. It is. That is, as shown in FIG. 17, the universal joint yoke 51 incorporating the misassembly prevention device 7 according to the third embodiment of the present invention is similar to the universal joint yoke 51 according to the first embodiment. , 52 are formed. A cross shaft (not shown) is inserted into the circular holes 521 and 521 formed in the arm portions 52 and 52 through a bearing, and the other yoke 51 (not shown) is coupled through the cross shaft. .

  A cylindrical coupling cylinder portion 53 is formed in the yoke 51, and an axis (pinion shaft) is formed on the inner peripheral surface 531 of the coupling cylinder portion 53 from the left side in FIG. 17A in parallel to the axial direction of the coupling cylinder portion 53. ) 6 (see FIG. 15) is inserted. The coupling cylinder part 53 of the yoke 51 is formed with a pair of left and right flange parts 54A and 54B extending in a tangential direction from the coupling cylinder part 53. A slit (cut) 56 communicating with the inner peripheral surface 531 is formed between the flange portions 54A and 54B.

  A cylindrical pin (engagement protrusion) 57 is formed on the outer periphery 533 of the coupling cylinder portion 53 so as to protrude radially outward on the opposite side of the slit 56. As shown in FIGS. 15 and 16, the misassembly prevention tool 7 of the third embodiment is formed of an integral resin as in the first embodiment, and includes the outer circumferential surface surrounding portion 71, the first A gripping claw portion 72, a bolt insertion blocking portion 73, and an engagement groove 78 are provided.

  When the outer circumferential surface surrounding portion 71 is inserted into the coupling cylinder portion 53 from the end surface 534 side on the side opposite to the arm portion of the coupling cylinder portion 53, the inner circumferential surface 711 is externally fitted to the outer circumferential surface 533 and surrounds the outer circumferential surface 533. The width of the inner peripheral surface 711 is slightly shorter than the width of the coupling cylinder portion 53. Accordingly, when the inner peripheral surface 711 of the outer peripheral surface surrounding portion 71 is externally fitted to the outer peripheral surface 533 of the coupling cylinder portion 53, the inner peripheral surface 711 is fitted to the outer peripheral surface 533 with an interference fit. It becomes difficult to drop off from the coupling cylinder portion 53.

  A slit side extension 74 extending toward the arm portion 52 along the outer peripheral surface 533 of the coupling cylinder portion 53 is formed on the outer circumferential surface surrounding portion 71 on the slit 56 side of the coupling cylinder portion 53. An R concave surface (end surface abutting portion) 741 is formed on the slit-side extension portion 74 at the connection portion with the outer peripheral surface surrounding portion 71. When the outer peripheral surface surrounding portion 71 is inserted into the coupling cylinder portion 53, the R concave surface 741 of the misassembly prevention tool 7 abuts on the R convex surface 535 of the coupling cylinder portion 53, and the axial position of the misassembly prevention tool 7 is restricted. .

  An arcuate anti-slit side extension 75 extending toward the arm portion 52 along the outer peripheral surface 533 of the coupling tube portion 53 is formed on the outer circumferential surface surrounding portion 71 on the anti-slit side of the coupling tube portion 53. . Therefore, the misassembly prevention tool 7 sandwiches the coupling cylinder part 53 from both sides in the vertical direction (vertical direction in FIG. 15) of the coupling cylinder part 53 by the slit side extension part 74 and the anti-slit side extension part 75.

  The slit-side extension 74 is formed with first gripping claws 72, 72 extending toward the axis of the coupling cylinder 53 at the end on the arm 52 side. Cutout grooves 721 and 721 are formed at the bases of the first gripping claws 72 and 72. When the first gripping claw portions 72 and 72 are pushed into the arm portion 52 on the slit 56 side from the slit 56 side, the first gripping claw portions 72 and 72 are elastically deformed at the bases near the notch grooves 721 and 721. The space between the arm portions 52 and 52 is widened, and the arm portion 52 is gripped by the first gripping claw portions 72 and 72.

  Engagement protrusions 722 and 722 are formed at the upper ends of the first gripping claws 72 and 72 and are bent into an L shape toward the center in the width direction of the coupling cylinder portion 53. On the upper surfaces of the engagement protrusions 722 and 722, inclined surfaces 723 and 723 are formed. The inclined surfaces 723 and 723 are formed in a shape that descends from the outer side in the width direction of the coupling cylinder portion 53 toward the center. An engagement surface 724 that engages with the inner surface 522 of the arm portion 52 is formed on the lower surface of the engagement protrusions 722 and 722.

  Accordingly, when the first gripping claw portions 72 and 72 are pushed into the arm portion 52 on the slit 56 side from the slit 56 side, the inclined surfaces 723 and 723 of the engaging protrusions 722 and 722 are formed on the outer surface 523 of the arm portion 52. Abut. Further, when the first gripping claws 72 and 72 are pushed into the arm portion 52, the first gripping is performed at the roots near the notch grooves 721 and 721 by the component force on the inclined surfaces 723 and 723 outward in the width direction. Since the claw portions 72 and 72 are elastically deformed and the interval between the engagement protrusions 722 and 722 is widened, the engagement protrusions 722 and 722 are pushed into the inner surface 522 side of the arm portion 52.

  When the engagement protrusions 722 and 722 reach the inner surface 522 of the arm portion 52, the elastic deformation of the first gripping claw portions 72 and 72 is restored, and the interval between the engagement protrusions 722 and 722 is reduced. The mating surfaces 724 and 724 engage with the inner surface 522 of the arm portion 52.

  Therefore, the end portion on the arm portion 52 side of the slit-side extension portion 74 is locked to the arm portion 52 by the engagement protrusions 722 and 722. As a result, even if a downward force in FIG. 15 is applied to the slit-side extension 74, the erroneous assembly preventing tool 7 is difficult to come off from the yoke 51.

  The inner surface 522 of the arm portion 52 and the end surface 536 on the arm portion side of the coupling cylinder portion 53 are smoothly connected by an R concave surface 537. The engaging protrusions 722 and 722 are engaged with the inner side surface 522 in the vicinity of the connection portion between the R concave surface 537 and the inner side surface 522. Therefore, even if a leftward force in FIG. 15 is applied to the misassembly prevention tool 7, the engagement protrusions 722 and 722 come into contact with the R concave surface 537 and restrict the axial position of the misassembly prevention tool 7.

  As shown in FIGS. 15 and 16, an engagement groove 78 is formed in the anti-slit side extension 75. The engagement groove 78 is formed to have a slightly wider groove width than the diameter of the cylindrical pin 57, the end on the arm part 52 side is closed, and the end on the end surface 534 side on the opposite arm part side of the coupling cylinder part 53 is closed. It is open. When the misassembly prevention tool 7 is assembled in the yoke 51, the cylindrical pin 57 formed on the outer periphery 533 is fitted into the engagement groove 78 and engaged. The cylindrical pin 57 abuts against the closed end portion of the engagement groove 78 and prevents the anti-slit side extension 75 from moving to the end surface 534 side on the anti-arm portion side of the coupling cylinder portion 53.

  In the slit-side extension portion 74, a bolt insertion blocking portion 73 having the same shape as that of the first embodiment is formed in the center portion in the width direction of the slit-side extension portion 74. That is, the bolt insertion preventing portion 73 is formed such that the root 731 has a small width, and a wide bolt insertion preventing surface 732 is formed on the upper side.

  In addition to the effects of the erroneous assembly prevention tool 7 of the first embodiment described above, the erroneous assembly prevention tool 7 of the third embodiment of the present invention has the following effects. That is, as shown in FIG. 15, the misassembly prevention tool 7 of the third embodiment has the first gripping claw portion 72 engaged with the arm portion 52 on the slit side when the misassembly prevention device 7 is incorporated in the yoke 51. At the same time, the engaging groove 78 engages with the cylindrical pin 57 on the outer periphery 533 on the side opposite to the slit. Therefore, the movement of the misassembly prevention tool 7 in the axial direction and the direction orthogonal to the axial direction is prevented, and the misassembly prevention tool 7 is removed from the yoke 51 only by pressing the misassembly prevention tool 7 against the yoke 51. Can be reliably prevented.

  In the above-described embodiment, the example in which the bolt hole 541 is formed in one of the pair of flange portions 54A and 54B and the female screw 542 is formed in the other is described as an example, but the pair of flange portions 54A and 54B is described. It is also possible to apply to a universal joint in which bolt holes 541 and 541 are formed in both of them and a nut is screwed into the male screw 552 of the bolt 55.

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 Arm part 521 Circular hole (bearing hole)
522 Inner surface 523 Outer surface 53 Coupling tube portion 531 Inner peripheral surface 532 Flat surface 533 Outer surface 534 End surface on the opposite arm side 535 R convex surface 536 End surface on the arm portion side 537 R concave surface 54A, 54B Flange portion 541 Bolt hole 542 Female screw 55 Bolt 551 Bolt shaft 552 Male thread 56 Slit (cut)
57 Cylindrical pin (engagement protrusion)
6 axis (pinion axis)
61 Flat surface 62 Recessed portion 63 Tip 7 Misassembly prevention tool 71 Outer peripheral surface surrounding portion 711 Inner peripheral surface 72 First gripping claw portion 721 Notch groove 722 Engaging projection 723 Inclined surface 724 Engaging surface 73 Bolt insertion preventing portion 731 Root 732 Bolt insertion blocking surface 733 Upper end 74 Slit side extension 741 R concave surface (end surface abutting portion)
75 Non-slit extension portion 76 Notch groove 77 Second gripping claw portion 771 Notch groove 772 Engagement protrusion 773 Inclined surface 774 Engagement surface 78 Engagement groove

Claims (7)

A coupling cylinder portion having an inner peripheral surface for fitting the shaft so that rotational torque can be transmitted;
A slit formed in the coupling cylinder and penetrating the inner peripheral surface;
A pair of flange portions provided integrally with the coupling cylinder portion across the slit,
A pair of arm portions provided integrally with the coupling cylinder portion and having bearing holes for supporting the cross shaft;
A bolt shaft part is fitted in a bolt hole formed in the flange part, a gap between the slits between the pair of flange parts is narrowed, an inner peripheral surface of the coupling cylinder part is reduced, and an outer periphery of the shaft Used for assembling universal joints with bolts that tighten the surface with the inner peripheral surface of the coupling cylinder,
A misassembly prevention tool for preventing the shaft from being fixed to the coupling cylinder part in a state where the shaft is not inserted into the normal position in the axial direction of the coupling cylinder part,
An outer peripheral surface surrounding portion that surrounds the outer peripheral surface of the coupling cylinder portion and fits with the outer peripheral surface with an interference fit ;
An end surface abutting portion that is formed on the outer peripheral surface surrounding portion and abuts against an end surface on the side opposite to the arm portion of the coupling cylinder portion;
A gripping claw portion formed on a slit-side extension extending toward the arm portion of the outer peripheral surface surrounding portion and gripping at least one of the pair of arm portions;
It is formed on the slit side of the outer peripheral surface surrounding portion, enters into the slit, and is pushed by the tip of the shaft inserted into the coupling cylinder portion, thereby preventing the bolt from being inserted into the bolt hole. It is provided with a bolt insertion blocking portion that can be elastically deformed at a release position that releases the blocking from the blocking position,
A misassembly prevention tool for a universal joint, characterized in that the misassembly prevention tool is entirely formed of an integral resin. In the misassembly prevention tool of the universal joint according to claim 1,
The universal assembly erroneous assembly prevention tool, wherein the outer peripheral surface surrounding portion is fitted to the outer peripheral surface of the coupling cylinder portion with an interference fit. In the misassembly prevention tool of the universal joint according to claim 1,
The gripping claw part is
A first gripping claw portion for gripping one of the pair of arm portions;
And a second gripping claw portion for gripping the other of the pair of arm portions. In the misassembly prevention tool of the universal joint according to claim 1,
The universal joint misassembly prevention tool characterized in that the gripping claw part abuts against an end surface of the coupling cylinder part on the arm part side and restricts an axial position of the misassembly prevention tool. In the misassembly prevention tool of the universal joint according to claim 1,
A mis-assembly of a universal joint, characterized in that a notch groove is formed at the base of the gripping claw part, the gripping claw part is elastically deformed at the base near the notch groove, and the arm part is gripped by the gripping claw part. Anti-sticking tool. In the misassembly prevention tool of the universal joint according to claim 1,
A universal joint preventive assembling prevention tool characterized in that a base width of the bolt insertion blocking portion is formed small and the bolt insertion blocking portion is elastically deformed at the base having a small width. In the misassembly prevention tool of the universal joint according to claim 1,
An engagement protrusion formed on the outer peripheral surface of the coupling cylinder portion so as to protrude radially outward;
An erroneous assembly prevention tool for a universal joint, comprising an engagement groove formed on the outer peripheral surface surrounding portion and engaging with the engagement protrusion to restrict axial movement of the erroneous assembly prevention tool.

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