KR100764227B1 - Clearance prevention structure of swing yoke - Google Patents

Abstract

The present invention includes an input shaft having a seating portion formed by an undercut at one end thereof and having a groove formed in the axially perpendicular direction of the seating portion; A swing yoke having a U-shaped fastening portion to be seated on the input shaft and connected to a joint connected to a steering shaft to be rotatable within a predetermined angle range; A large bolt hole and a small bolt hole formed opposite both sides of the upper part of the fastening part; Bolts fastened to the large and small bolt holes; It is made of a cylindrical shape, the projection portion corresponding to the groove of the seating portion is formed in the longitudinal direction on one outer periphery, and is inserted into the beginning portion of the large bolt hole and the bolt to allow the bottom portion to generate a predetermined interference with the top of the seating portion. A bush extending to the outside of the bolt hole by a predetermined amount; and the bush extending by the tightening of the bolt is pushed in and the bottom of the bush is deformed by the frictional force caused by the interference with the seating portion to press the input shaft, thereby engaging the input shaft and the swing yoke. It relates to a play prevention structure of the swing yoke, characterized in that the sub play is prevented.

Universal joint, bush, play prevention, swing yoke

Description

Clearance structure of swing yoke {CLEARANCE PREVENTION STRUCTURE OF SWING YOKE}

1 is a perspective view of a conventional swing yoke having a serration coupling portion.

2 is a perspective view of a conventional swing yoke having a seating portion by an undercut.

3 is a cross-sectional view of an essential part of FIG. 2.

4 is an exploded perspective view of a conventional swing yoke having a play prevention structure.

5 is a detailed cross-sectional view of an essential part of FIG. 4.

Figure 6 is an exploded perspective view of the play prevention structure of the swing yoke according to an embodiment of the present invention.

7 is a cross-sectional view of the state before the play prevention member is fastened by the bolt according to an embodiment of the present invention, Figure 8 is a cross-sectional view of the fastened state by the bolt.

9 is a cross-sectional view illustrating main parts of a play prevention structure of a swing yoke according to an exemplary embodiment of the present invention.

10 is an exploded perspective view of a play prevention structure of a swing yoke according to another embodiment of the present invention.

11 is a cross-sectional view of a state before the play prevention member is fastened to the bolt according to another embodiment of the present invention, Figure 12 is a cross-sectional view of the fastened state by the bolt.

13 is a main end shaving of the play prevention structure of the swing yoke according to another embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

510: driven yoke 520: swing yoke

530: U-shaped fastening portion 532: support portion

536: large bolt hole 538: small bolt hole

550: input shaft 552: chamfer

560: seating part 565: groove

570: bolt 580: bush

582: chamfering 585: protrusion

585a: protrusion

The present invention relates to a connection structure of a universal joint and a gearbox of a vehicle steering apparatus, and more particularly, a swing yoke that can prevent the play of the coupling part when combining the swing yoke of the universal joint and the input shaft of the gearbox in this type. It relates to a play prevention structure of the.

The steering device for vehicles is a device that can change the direction of movement of the vehicle arbitrarily according to the intention of the driver.The steering wheel for transmitting the driver's operating force to the rotary motion and the gearbox and the operating force for converting the operating force from the rotary motion to the linear motion It consists of a tie rod or the like to transmit to the wheels.

In the above, a universal joint is installed between the steering shaft and the gearbox. In general, the universal joint is inclined at an arbitrary angle and transmits rotational force therebetween, and consists of a joint and a swing yoke. Here, the swing yoke is free to rotate within a predetermined angle. And the swing yoke is connected to the input shaft of the gearbox, conventionally formed serration 140 in the cylindrical fastening portion 130 of the swing yoke 120 connected to the driven yoke 110, as shown in FIG. The serration 160 corresponding to the input shaft 150 is formed to insert the input shaft 150 into the cylindrical fastening unit 130, and then tightened by fixing the bolt 170 provided at one end of the cylindrical fastening unit 130. Let's do it. In such a structure, since the input shaft 150 or the swing yoke 120 must be moved in the axial direction by the engagement length, the swing shaft is fixed when the input shaft 150 connected to the driven yoke 110 and the gearbox (not shown) is fixed to the vehicle. It was difficult to fasten the yoke 120 and the input shaft 150. Therefore, when the swing yoke 120 and the input shaft 150 of the gearbox are connected, a structure that can replace the assembly of the serration (140, 160) type due to the vehicle layout problem has been developed.

So, instead of the serration connection structure, as shown in FIG. 2, the fastening part 230 of the swing yoke 220 has a U-shaped structure in which one side is opened, and the U-shaped fastening portion of the front end of the input shaft 250 is formed. It is formed so as to match the 230, the upper side of the input shaft 250 is formed in the seating portion 260 by the undercut (UNDER CUT) and then the swing yoke 220 in the state in which the input shaft 250 is fixed to the upper side (The arrow direction), and the U-shaped fastening portion 230 of the swing yoke 220 thus lifted up in the hole formed opposite to the upper end of the U-shaped fastening portion 230 in a state in which the bolt ( 270 is fastened so that the shank portion of the bolt 270 is caught by the seating portion 260 to transmit the rotational force of the steering shaft to the input shaft 250 through the swing yoke 220.

Although the above connection structure can be fastened in a state where the input shaft 250 is fixed, the assemblability is improved, but due to the eccentric rotational force transmitted through the swing yoke 220, even if only a little play occurs in the connection portion with the input shaft 250, the vibration or A noise problem has occurred.

Therefore, according to US6135667 (patent number) proposed as a method of removing the play of the connection portion, as shown in Figure 4, the shank portion of the bolt 370 is composed of a jacket 375 formed with a slit 372, the input shaft ( When the bolt 370 is fastened while the U-shaped fastening part 330 of the swing yoke is wrapped, the width of the U-shaped fastening part 330 is narrowed according to the tightening amount of the bolt 370, and the jacket 375. As this is pressed and convexly deformed as shown in FIG. 5, the adhesion to the input shaft 350 becomes strong. That is, the jacket is deformed by the adhesion strengthening, and the play is removed.

However, in the above structure, as shown in FIG. 5, since only the central portion of the jacket 375 is convex and is in point contact with the input shaft 350, this portion is worn by the continuous rotational force, and there is a problem that the play is generated again. have. In US6135667, a few more implementation structures have been developed, but all of them are integrally formed with bolts, but only the shank portion is changed to prevent play. This structure is limited in preventing play.

The present invention is to solve the problems as described above, the gap prevention member that can be removed and prevented the clearance of the coupling portion between the swing yoke and the input shaft by changing the structure according to the tightening force of the bolt without being formed integrally with the bolt To provide a play prevention structure of the swing yoke having a.

The present invention provides an input shaft having a seating portion formed by an undercut at one end thereof and having a groove formed in the axially perpendicular direction of the seating portion in order to achieve the above object; A swing yoke having a U-shaped fastening portion to be seated on the input shaft and connected to a joint connected to a steering shaft to be rotatable within a predetermined angle range; A large bolt hole and a small bolt hole formed opposite both sides of the upper part of the fastening part; Bolts fastened to the large and small bolt holes; It is made of a cylindrical shape, the projection portion corresponding to the groove of the seating portion is formed in the longitudinal direction on one outer periphery, and is inserted into the beginning portion of the large bolt hole and the bolt to allow the bottom portion to generate a predetermined interference with the top of the seating portion. A bush extending to the outside of the bolt hole by a predetermined amount; and the bush extending by the tightening of the bolt is pushed in and the bottom of the bush is deformed by the frictional force caused by the interference with the seating portion to press the input shaft, thereby engaging the input shaft and the swing yoke. It provides a play prevention structure of the swing yoke, characterized in that the sub play is prevented.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 6, the driven yoke 510 is provided with a universal joint connected to an input shaft 550 of a gearbox (not shown), and the driven yoke 510 of the universal joint rotates within a predetermined angle. The free swing yoke 520 is coupled to the input shaft 550.

One end of the swing yoke 520 is coupled to the driven yoke 510 so as to be rotatable within a predetermined angle, and the other end is coupled to the input shaft 550. A pair of support plates having a U-shaped cross section facing each other ( A U-shaped fastening portion 530 having a 532 is formed, and a large bolt hole 536 and a small bolt hole 538 which are opposed to each other are formed in the upper portion of the support plate 532.

The input shaft 550 is formed of a substantially rectangular front end to be seated on the U-shaped fastening portion 530, the upper side forms a seating portion 560 of the bolt by the undercut (UNDER CUT), one side edge The portion is rounded to be in close contact with the inner circumferential surface of the U-shaped fastening portion, and the opposite one side edge forms a chamfer 552 to have a predetermined inclination angle. In addition, a groove 565 is formed in the center of the seating portion 560 along the perpendicular direction of the input shaft 550.

As shown in FIG. 6, a cylindrical bush 580 is provided as a clearance preventing member, and a protrusion 585 is formed along an axial direction at one outer circumference thereof, and the protrusion 585 is a seating part 560 during assembly. It mates with the groove 565 formed in the. The bush 580 is inserted into the large bolt hole 536 to have the same diameter as the size of the large bolt hole 536, so that the large bolt hole 536 into which the bush 580 is inserted is the opposite small bolt. The diameter of the bush 580 is slightly larger than that of the hole 538 to compensate for the thickness of the bush 580. After the bush 580 is press-fitted, the bush inner diameter is equal to that of the small bolt hole 538 so that the diameter of the bush 580 passes through the bush 580. The bolt 570 is passed through, and the lowest point of the large bolt hole 536 is formed to be slightly lower than the upper surface of the input shaft 550 seated in the U-shaped fastening portion 530, and the tip of the bush 580 is fixed. Chamfering portion 582 is formed along the circumference. The bush 580 inserted into the large bolt hole 536 extends a predetermined amount to the outside of the support plate 532, and the end thereof is caught by the bolt head when the bolt 570 is fastened. Here, the length of the bush 580 extending to the outside of the support plate 532 should be shorter than the distance between the support plates 532 so that the protruding portion of the bush can be completely pushed in when the bolt 570 is fastened.

Lifting the swing yoke 520 in the direction of the arrow while the input shaft 550 is disposed in the installation position, the bolt 570 in the state in which the input shaft 550 is seated on the U-shaped fastening portion 530 of the swing yoke. As shown in FIGS. 7 and 8, as the bush 580 inserted into the large bolt hole 536 is fastened by the bolt 570, the U-shaped fastening part 530 is pressed by the bolt head. The bottom of the bush 580 is disposed below the top surface of the input shaft 550, so that the top portion of the bush 580 is strongly raised from the top through the chamfer 552 of the input shaft 550, starting with the chamfer 582. The friction is deformed while pressing the input shaft 550 in the direction of the arrow (F), the protrusion 585 is engaged with the groove 565 to guide the progress of the bush 580. That is, the upper surface of the large bolt hole 536 and the small bolt hole 538 acts as a pressing surface, and the input shaft 550 and the bolt 570 are brought into close contact with the bush 580 pushed together with the bolt 570 downward. Since the clearance between the removal of the bush 580 is fixed as shown in Figure 9, the protrusion 565 is engaged with the groove 565 and fixed, so that the input shaft 550 and the bush 580 after rotation is rotated To prevent them.

In the above, if the length of the bush 580 is too short, the pressing force acts only on the initial part of the bolt 570, so that an eccentric force is generated, and it is not effective to remove the clearance, and if the length of the bush 580 is too long, the clearance removal effect is Although excellent in assembly ability due to an increase in torque for tightening the bolt 570, it should be designed in consideration of this point.

10 is another embodiment of the present invention, as shown, the tapered portion 585 of the bush 580 in the circumferential direction, and the length of the bush 580 is inserted into the small bolt hole 538 As shown in FIGS. 11 and 12, the protrusions 585a of the bush 580 are pushed along the grooves 565 as shown in FIGS. 11 and 12 as the bolts 570 are tightened. 538 is inserted. Therefore, in another embodiment of the present invention, the large bolt hole 532 and the small bolt hole 538 should have the same diameter. As described above, when the protrusion 585a is tapered, the gap inevitably generated by the processing tolerance is compensated by the deformation of the tapered protrusion 585a according to the tightening force of the bolt 570, and the tightening of the bolt 570 is performed. Accordingly, the bush 580 forcibly pushed can also be easily fastened according to the guide of the tapered protrusion 585a.

As described above, according to the present invention, a bush as a gap preventing member is provided between the input shaft bolts, and a bolt hole is formed lower than a reference position to generate an interference between the input shaft and the bush as the gap preventing member, and then pressurized by a bolting force of the bolt. As the bush is deformed, the clearance between the input shaft and the bolt is eliminated, the groove of the bush and the groove of the seat are combined to prevent the rotation of the coupling part between the input shaft and the swing yoke after fastening, and tapering the projection of the bush according to the clearance The play is simply removed by the amount of deformation of the tapered protrusion.

Claims (3)

An input shaft having a seating portion formed by an undercut at one end and having a groove formed in the axially perpendicular direction of the seating portion; A swing yoke having a U-shaped fastening portion to be seated on the input shaft and connected to a joint connected to a steering shaft to be rotatable within a predetermined angle range; A large bolt hole and a small bolt hole formed on both sides of the fastening part so as to face each other; Bolts fastened to the large and small bolt holes; It is formed in a cylindrical shape, the projection is formed in the longitudinal direction corresponding to the groove of the seating portion on one side circumference and is inserted into the large bolt hole and is fastened by the bolt; comprising a tightening of the bolt to the outside of the support plate The swing yoke prevention structure of the swing yoke, characterized in that the bottom portion of the bush is deformed by the friction force caused by the interference with the seating portion to press the input shaft, thereby preventing the play between the input shaft and the swing yoke. The method of claim 1, The front end of the bush play prevention structure of the swing yoke, characterized in that the chamfered portion is formed so as to induce a smooth initial interference between the input shaft. The method of claim 1, The upper edge of the input shaft is a play prevention structure of the swing yoke, characterized in that the chamfering portion is formed so as to induce a soft initial interference between the tip of the bush.

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