KR200219820Y1 - Tongue Clamp of Material Joint Boot - Google Patents

Abstract

The present invention has a tongue portion (3) and the engaging projection (5) is formed at one side end, respectively, the coupling hole (7) and the crimping portion (9) coupled to the engaging projection (5) at the other end is formed, respectively In the clamp (1) for fastening the boot (11) of the material joint (10) on the shaft (13), the clamp (1) has an enlarged portion (15) at the side end of the engaging hole (7) being bent (17). The diameter of the tongue portion 3 extends radially outward by the thickness t, and the bent portion of the radially inner surface 19 of the enlarged diameter portion 15 contacting the tongue portion 3 at the time of fastening. 17 and to a tongue clamp of a material joint boot in which a plurality of guide protrusions 21 for guiding the tongue portion 3 protrude and are formed at a position adjacent to the tongue portion. Since the other end is the enlarged diameter portion 15, the tightening force of the clamp 10 against the inner surface of the boot 11 is uniformly distributed, and the tongue portion 3 is guided by the guide protrusion 21. Since it is guided in place, it is possible to assemble the clamp 10 correctly.

Description

Tongued boot clamp for universal-joint

The present invention relates to a clamp for fixing a boot used in a universal joint of a vehicle, and more particularly, a plurality of guide protrusions in which a tongue portion is formed at one end and the tongue portion is guided at the other end. At the same time, the other end is extended radially outward as much as the thickness of the tongue, so that the tongue of the other end is not protruded from side to side when tightening, and discontinuities are not generated on the inner peripheral surface. It is about.

In general, the drive shaft in the automobile is connected to the output shaft of the transmission to serve to transmit the rotational power transmitted from the engine to the drive wheel.

The drive shaft is provided with a material joint to change the angle according to the displacement of the wheel according to the driving state, that is, to be able to be bent, so as to smoothly transmit the rotational power output from the transmission to the driving wheel.

On the other hand, the material joints vary in shape and number of installation depending on the position of the driving wheel, the type of suspension and steering system, etc. In the formal classification, the driving shaft is oscillated simultaneously with the rotation of the driven shaft. Because the effective radius changes, it is divided into inconstant material joints which become inconstant velocity and constant speed joints that can rotate at constant speed because the contact point between the driving shaft and the driven shaft is always located on the bisecting line of the deflection angle.

In addition, the classification route according to the arrangement is divided into a wheel-side material joint that can accommodate the steering angle by the steering system, and a transmission-side material joint that can absorb the maximum displacement amount due to the vertical movement of the suspension system.

Among the above-mentioned material joints, the constant velocity joints are typically tripod joints, double offset joints, ball-type joints, and double spider joints. Can be mentioned.

Meanwhile, among the constant velocity joints, tripod joints, double offset joints, and spherical joints are ball or rollers which achieve sliding displacements in the housing and in the housing for smooth bending displacement or axial displacement simultaneously with high speed driving. Lubricating oil is injected between the sliding members of the back and the like, and a boot for preventing the inflow of foreign substances and preventing the lubricant from being lost to the outside is covered.

Here, an example of the spherical material joint on the wheel side of the constant velocity material joint using the lubricating oil and the boot as described above is illustrated in FIGS. 1 and 2.

As shown in the accompanying drawings, an inner race having an axle-side drive shaft 210 to which rotational power is transmitted from the transmission to the central shaft hole 231 and having a plurality of arc-shaped ball contact surfaces 232 on the outer circumferential surface thereof (inner) a ball cage 240 having a rase 230, each ball 241 positioned outside the inner race 230 and in contact with each arc-shaped ball contact surface 232, and one side of which is open; And a ball housing 221 of the wheel-side drive shaft 220 having a semicircular rail groove 222 in the axial direction such that the ball portion 241 of the ball cage 240 contacts the inner circumferential surface of the space portion.

Meanwhile, a corrugated boot 211 which prevents foreign substances such as dust from flowing into the ball housing 221 and prevents leakage of lubricant, such as grease, injected into the ball housing 221 to the outside, is seen. Covered to the open side of the housing 221, one end of the corrugated boot 211 is axle-side drive shaft 210, the other end is the front end of the ball housing 221 by sealing in the ball housing 221 Clamps 212 and 213 are fixed.

The spherical material joint of the vehicle drive shaft configured as described above has an inner race 230 fastened to the axle side drive shaft 210 according to the displacement of the wheel according to the driving state to the arc-shaped ball contact surface 232 and the ball cage 240. Sliding flow between the inserted ball 241 and the circular arc-shaped rail groove 222 of the ball housing 221 is able to give a bending change. At this time, the amount of bending displacement is about 47 degrees, and no potential in the axial direction is achieved, and the arc grooves 222 of the ball housing and the arc contact surface 232 of the inner race 230 and the balls of the ball cage 240 ( The oil film is formed by the injected lubricating oil in 241 to minimize the frictional force due to sliding.

At this time, the clamp of the material joint is a metal strip, and as shown in FIG. 3, a tongue portion 251 and a coupling protrusion 253 formed at one end are formed, respectively, and the coupling protrusion is formed at the other end. Coupling hole 255 and the crimping portion 257 to be coupled to the 253 is formed, respectively.

Accordingly, when the clamp 212 is fastened to the boot 211 as shown in FIGS. 4 and 5, one side end portion formed with the tongue portion 251 and the engaging protrusion 253 is positioned downward. Coupling protrusion 253 is fitted into the coupling hole 255 of the other end by winding the outer circumferential surface, and then compressing the compression portion 257 from both sides so that the entire clamp 212 shrinks and deforms. Tighten the outer circumference. At this time, the tongue portion 211 is embedded in the lower surface of the other end as shown in FIG.

As shown in FIG. 6, the conventional clamp 212 protrudes radially inward as much as its thickness t while the tongue portion 251 overlaps the lower surface of the other end, thereby causing discontinuous contact. As a result, it is impossible to give a uniform tightening force as a whole due to the overlapping portion, and the tongue portion 251 having a relatively small contact force due to the reaction force of the outer circumferential surface of the boot 211 during repeated expansion and contraction of the boot 211 while driving the vehicle is the outer circumferential surface of the boot 211. There was a problem that the slipping off while slipping causes a loss of tightening force.

In addition, since the end of the tongue portion 251 is not constrained in the axial direction of the drive shaft 210 when the pressing portion 257 is pressed, it protrudes to the left and right of the body of the clamp 212, causing misassembly of the clamp 212. Or damage the outer circumferential surface of the boot 211 after assembly.

Therefore, the present invention was devised to solve the problems of the conventional clamp structure as described above, and when the clamp is fastened to the outer peripheral surface of the boot, both ends of the clamp form the same contact surface without the discontinuous surface, resulting in uneven contact of the clamp. At the same time to prevent separation and maintain the same overall tightening force, and also to form a guide protrusion on the lower surface of the other end that the tongue portion of one side contact with the tongue portion is guided to the correct position to be assembled with other parts The purpose is to prevent damage caused by interference.

1 is an exploded perspective view showing a conventional automobile spherical material joint and a conventional corrugated boot assembly structure mounted thereto.

Figure 2 is a partial cutaway cross-sectional view showing the assembly of the material joint shown in FIG.

Figure 3 is a plan view showing a conventional clamp deployment state mounted to the material joint of Figures 1 and 2.

4 is a schematic front view showing the assembled state of the clamp shown in FIG.

5 is a partial cross-sectional front view of the portion A of FIG.

Figure 6 is a partial perspective view showing a state in which the tongue portion of Figure 5 is coupled.

Figure 7 is a partial cutaway cross-sectional view of the joint material is applied according to the present invention.

8 is a plan view showing an expanded state of the clamp according to the present invention.

Figure 9 is a partial perspective view showing a state in which the tongue portion of the clamp is coupled according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: clamp 3: tongue area

5: engaging projection 7: coupling hole

9: crimping part 10: joint

11: boot 13: drive shaft

15: enlarged portion 17: bent portion

21: guide protrusion

In order to achieve the above object, the present invention has a tongue portion and a coupling protrusion formed at one end, and a coupling hole and a crimping portion coupled to the coupling protrusion are formed at the other end, respectively, to clamp a boot of a material joint on an axis. This clamp has a diameter that extends radially outwardly from the bend of the engaging hole side end by the thickness of the tongue, and at the position adjacent to the bent part of the radially inner side of the enlarged part which is in contact with the tongue when tightening. It is to provide a tongue clamp of the material joint boot is formed with a plurality of guide protrusions protruding.

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

As shown in FIG. 7, the material joint 10 to which the tongue clamp 1 of the material joint boot according to the present invention is applied has the same structure as the conventional general material joint. That is, an inner race 23 to which the drive shaft 13 is fastened and fixed, a ball cage 27 supporting the sliding ball 25 outside the inner race 23, and a ball housing forming an outer body to surround the ball 25. (29) And it is comprised by the boot 11 fixed to the ball housing 29 opening side so that cleanliness and lubrication of the inside of the ball housing 29 may be maintained.

At this time, the clamp 1 according to the present invention is employed as a means for fixing the boot 11 to the open outer peripheral surface of the ball housing 29.

As shown in detail in the expanded state in FIG. 8, the clamp 1 is shaped like a band of metal, and has a tongue portion 3 formed at one end thereof, and at a position adjacent to the inner side thereof. A plurality of engaging projections 5 protrude radially outward. And the crimping | compression-bonding part 9 is formed in the other end side opposite the tongue part 3 of the clamp 1.

In this case, the clamp 1 according to the present invention has an enlarged diameter portion 15 in which the end portion of the crimping portion 9 extends radially outward from the bent portion 17 by the thickness t of the tongue portion 3. It is formed. At least two or more guide protrusions 21 arranged vertically along the center line of the clamp 1 body are formed at positions adjacent to the radially inner surface bent portion 17 of the enlarged diameter portion 15.

Thus, when the clamp 1 is fastened in a ring shape as shown in Fig. 9 or 4, the engaging projection 7 at the end of the tongue portion 3 side of the clamp 1 is engaged on the opposite side thereof. After being fastened to the ball 7, the tongue portion 3 is guided into the space in the middle of the guide protrusion 21 as it is indented along the radially inner surface of the enlarged diameter portion 15.

Then, the pressing part 9 is pressed in both directions, that is, in the direction of the center line of the clamp 1 body, causing the clamp 1 to compressively deform, thereby generating a tightening force on the boot 11.

At this time, since the enlarged diameter portion 15 is extended radially outward by the thickness t of the tongue portion 3, even if the tongue portion 5 is embedded, the contact portion with respect to the boot 11 has continuity, and thus the boot (11) It has a uniform clamping force distribution over the entire outer circumferential surface. In addition, when the pressing portion 9 is compressed and pressurized, the tongue portion 3, which is introduced into the inside of the enlarged diameter portion 15, is guided to the correct position along the guide protrusion 21, that is, on the center line, so that the tongue portion 3 is provided. It is possible to prevent damage caused by misassembly or other components, especially the interference with the boot, caused by the up and down deviation.

As the existing hurdles are made to overlap the lower surface, it is possible to prevent the loss of the tightening force by slipping off the lower surface overlapped by the reaction force of the outer peripheral surface of the boot during repeated expansion and contraction of the boot.

As described so far, according to the clamp of the present invention, when the clamp is ring-shaped to secure the boot with the clamp of the present invention on the outer circumferential surface of the ball housing open side of the material joint, the tongue portion of one end of the clamp is extended to the other end. Since the contact discontinuity is not fundamentally generated due to the overlap of both ends, it is possible to keep the boot tightening force uniformly throughout the clamp body, so even if the boot is repeatedly stretched and deformed while driving, the clamp is loosened and is separated from the boot outer peripheral surface. The risk of being prevented is prevented.

In addition, since the tongue part is guided along the guide protrusion when the clamp is fastened and positioned at the correct position, damage to adjacent parts such as the boot due to the disassembly of the clamp due to misassembly or the protruding tongue part during misassembly is also prevented. .

Although the present invention has been shown and described with respect to particular embodiments, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the accompanying Utility Model Claims. Anyone who owns it can easily find out.

Claims (1)

Tongue part (3) and coupling protrusions (5) are formed at one end, respectively, and coupling holes (7) and crimping portions (9) coupled to the coupling protrusions (5) are formed at the other end, respectively. In the clamp (1) for fastening the boot (11) of the shaft (10) on the shaft (13), the clamp (1) has an enlarged diameter portion (15) at the side end of the engaging hole (7) with a radius from the bending portion (17). The diameter is extended by the thickness t of the tongue portion 3 in the outward direction, and the bent portion 17 of the radially inner side surface 19 of the enlarged diameter portion 15 contacting the tongue portion 3 at the time of fastening. Tongue clamp of the material joint boot, characterized in that a plurality of guide projections 21 for guiding the tongue portion (3) protrudingly formed in an adjacent position.