JPH0671523A - Boot fixing device for constant velocity universal joint - Google Patents

Abstract

PURPOSE:To simplify the fixing operation of a boot, to obtain the stable fixed condition of the boot and to execute the automation of the boot fixing operation. CONSTITUTION:A set of tightening jigs 7 are radially arranged in the radial direction of a large-diameter part 6a of a boot 6. The respective two sets of tightening jigs 7c, 7e, and 7b, 7d are arranged around a tightening jig 7a located immediately below the large-diameter part 6a extending to each side in the circumferential direction. Two tightening jigs 7c, 7e are slidably mounted on a strut 9 through slide rails 7c1, 7e1, and driven in an advancing/retracting manner in the radial direction by means of cylinders 8c, 8e. Two tightening jigs 7b, 7d are slidably mounted on a strut 10 through slide rails 7b1, 7d1, and driven in an advancing/retracting manner in the radial direction by means of cylinders 8b, 8d. A band material 11 is preliminarily cut to the prescribed length. The band material 11 is supplied to the lower side of the large-diameter part 6a, and its center part is supplied to the outer circumference of the large- diameter part 6a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for a boot for a constant velocity universal joint.

[0002]

2. Description of the Related Art As shown in FIG. 7, a constant velocity universal joint, which is widely used in automobiles and various industrial machines, has a rubber boot 26 for waterproofing and dustproofing the constant velocity universal joint. Is installed. In the boot 26, the large diameter portion 26a is attached to the outer ring 20 of the constant velocity universal joint, and the small diameter portion 26b is attached to the shaft portion 21. The boot 26 is tightened and fixed by a boot band 22. As the boot band 22, a one-touch type boot band 22 as shown in FIG. 8 is widely used at present. This boot
The toe band 22 is formed by integrally joining a lever 23 formed of a member having a rigidity higher than that of the band member 22a to both end portions 22b formed by bending the band member 22a into a ring shape and palmed together, and fixing the boot 26. Is performed by reducing the inner diameter of the band using the lever action of the lever 23 and applying a tightening force (tightening force) to the band member 22a.

[0003]

According to the above-mentioned fixing means, the boot 26 is fixed to the outer periphery of the fixed portion of the boot 26 by passing the boot band 22 through the shaft portion 21 of the constant velocity universal joint. After mounting, the lever 23 is folded back. However, since the boot band 22 is an annular one whose both ends are previously joined, the boot 26 is fixed unless the boot band 22 is passed through the shaft portion 21 when the constant velocity universal joint is assembled. Can not do it.
This is one of the reasons why the fixing work of the boot is inefficient. Also, the fixing means are generally difficult to automate.

Further, in the fixing means, the tightening force (tightening force) of the band member is forcibly elastically deformed by the size difference between the inner diameter of the boot band and the outer diameter of the boot. can get. Therefore, this tension is naturally different if the elastic deformation amount of the boot, that is, the above-mentioned dimensional difference is different. That is, in the conventional fixing means,
The management of the tense force is done indirectly by the dimension management,
If there are variations such as production errors in the dimensions that are the premise, the tension will vary. The tightness of the boots may become unstable due to variations in the tension.

An object of the present invention is to eliminate the inconvenience that the boot band must be passed through the shaft portion in advance when fixing the boot, simplify the fixing work, and always stabilize the fixing. The status can be obtained
The purpose of the present invention is to provide a fixing device for the tool. Another object of the present invention is to achieve automation in the work of fixing the boot.

[0006]

According to a first aspect of the present invention, a constant velocity universal joint equipped with a boot is positioned and held, and a central portion of a band member having a predetermined length is applied to an outer periphery of a fixed portion of the boot, and a tip of the boot is provided. A plurality of tightening jigs, which have an arc shape that fits the outer circumference of the fixed part of the boot and are radially arranged in the radial direction of the fixed part of the boot, are sequentially installed from the center of the band member to both sides in the circumferential direction. The band member is wound around the outer periphery of the fixed portion of the boot by a predetermined tightening force by driving and advancing to the outer periphery of the band member and gradually pressing the band member from the central portion to both end portions to the outer periphery of the fixed portion of the boot. The boots are fixed by connecting the overlapping portions of both ends of the member to each other.

According to the second aspect of the present invention, the constant velocity universal joint to which the boot is attached is positioned and held, the central portion of the band member of a predetermined length is applied to the outer periphery of the fixed portion of the boot, and the tip of the joint fits the outer periphery of the fixed portion of the boot. In a circular arc shape, a plurality of tightening jigs radially arranged in the radial direction of the fixed part of the boot are sequentially driven and advanced to the boot side from those located in the central portion of the band member to both sides in the circumferential direction. By gradually pressing the band member from the central part to both end parts to the outer periphery of the fixed part of the boot, the band member is wound around the outer periphery of the fixed part of the boot with an approximately tense force, and further, each tightening jig is moved to the advance position. From the pressure sequentially,
By applying a predetermined tightening force to the band member by gradually pressing the band member from the central part to both end parts, the overlapping parts of both end parts of the band member are coupled to each other to fix the boot. I chose

According to a third aspect of the present invention, in the first or second aspect of the present invention, when the band member is pressed / pressurized, the tips of the respective fastening jigs are aligned with each other in the circumferential direction, and the tips of the fastening jigs are It forms one partial ring as a whole.

According to a fourth aspect of the invention, in the first or second aspect of the invention, when the band member is pressed / pressurized, the tip portions of the respective fastening jigs are aligned with each other in the circumferential direction, so that the tip ends of the fastening jigs. It forms one ring as a whole.

According to the invention of claim 5, the welding electrode is attached to the tightening jig located at the overlapping portion of the band member so as to be able to move forward and backward, the band member is pressed and pressed, and then the electrode is applied to the band member. By advancing and abutting, the overlapping portions of the band members are welded to each other.

[0011]

[Operation] A plurality of tightening jigs radially arranged in the radial direction of the fixed part of the boot are sequentially driven and advanced toward the boot side from those located in the central part of the band member to both sides in the circumferential direction, and the band member is centered. The band member can be wound around the fixed portion of the boot by gradually pressing from the portion to both end portions.

[0012]

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

As shown in FIG. 1, a pair of constant velocity universal joints 1, 1'connected via an intermediate shaft 2 are positioned and held on three positioning bases 3, 4, 5. Boots 6 and 6'are attached to outer rings 1a and 1'a of the constant velocity universal joints 1 and 1 ', respectively. The large-diameter portion 6a (6'a) of the boot 6 (6 ') is attached to the outer diameter of the opening of the outer ring 1a (1'a).
The small diameter portion 6b (6'b) is applied to the intermediate shaft 2.
Further, tightening jigs 7a (7'a) are attached to slide rails 7a1 on both sides of the column 4a that supports the central positioning table 4.
It is mounted slidably via (7'a1).
The tightening jig 7a (7'a) is connected to the cylinder 8a (8'a), and the cylinder 8a (8'a) allows the boot 6 (6 ') to move in the radial direction on the slide rail 7a1 (7'a1). Driven back and forth along. The tightening jig 7a is for tightening and fixing the large diameter portion of the boot. As shown in FIG. 2, of the set of tightening jigs 7 radially arranged in the large diameter portion (6a). Is one of. The tightening jig 7'a fixes the small diameter portion of the boot by tightening, and as shown in FIG. 6, a set of tightening jigs 7 radially arranged in the small diameter portion (6'b). 'Is one of the In this embodiment, the large-diameter portion of one boot and the small-diameter portion of the other boot can be simultaneously fixed by simultaneously operating the tightening jig 7 and the tightening jig 7 '. After the fixing of these parts is completed, the pair of constant velocity universal joints 1 and 1 ′ are swiveled 180 degrees in the horizontal plane and repositioned and held, and similarly, the small diameter portion of one boot and the other boot. Tighten and fix the large diameter part at the same time. In this way, two of the constant velocity universal joints
The large-diameter portion and the small-diameter portion of the pair of boots can be fixed by a single positioning operation.

Since there is no fundamental difference between the case of fixing the large-diameter portion of the boot and the case of fixing the small-diameter portion of the boot, the large-diameter portion 6a of the boot 6 will be described for simplicity in the following description. Will be described in detail only when it is fixed using the tightening jig 7 shown in FIG. Then, in FIG. 6, components common to the components shown in FIG. 2 in terms of configuration, action, and effect are shown by the same reference numerals with a prime (') attached, and the correspondence between them is clarified. .

As shown in FIG. 2, a set of tightening jigs 7 are radially arranged in the radial direction of the large diameter portion 6a of the positioned boot 6. Positioned immediately below the large-diameter portion 6a is the tightening jig 7a mounted on the above-mentioned support column 4a. With the tightening jig 7a as a base point, two tightening jigs 7c are provided on both sides in the circumferential direction. , 7e and 7
b and 7d are arranged. Two tightening jigs 7c, 7
e is the slide rails 7c1 and 7c on the column 9 on the left side in FIG.
It is mounted slidably via e1 and has a cylinder 8c,
8e drives the slide rails 7c1 and 7e1 forward and backward in the radial direction. Also, two tightening jigs 7b and 7d
Is the slide rails 7b1 and 7 on the right column 10 in FIG.
The cylinder 8b is slidably mounted through d1.
8d drives the slide rails 7b1 and 7d1 forward and backward in the radial direction. The tip of each tightening jig has a large diameter portion 6a.
Is formed in an arc shape having substantially the same curvature as the outer circumference of the, and a concave guide portion (7a2, 7b2, 7c2) for guiding adjacent tightening jigs in the radial direction is provided on the side portion of the tip end. Guides (7b3, 7c) guided by the guides of the
3, 7d3, 7e3) are provided.

The band member 11 is made of metal, for example,
It is cut into a predetermined length in advance. The band member 11 is supplied to the lower side of the large diameter portion 6a, and the central portion thereof is supplied to the large diameter portion 6a.
Is applied to the outer circumference of.

When the band member 11 is supplied to the predetermined position, first, the cylinder 8a is operated to drive and advance the tightening jig 7a to the boot 6 side. As shown in FIG. 3a, when the tip of the tightening jig 7a abuts on the central portion of the band member 11 and presses it against the outer circumference of the large diameter portion 6a, the central portion of the band member 11 moves along the outer circumference of the large diameter portion 6a. To bend. The tightening jig 7a holds this advanced position.

Next, the cylinders 8b and 8c are simultaneously operated to drive and advance the tightening jigs 7b and 7c to the boot 6 side. The tightening jigs 7b and 7c have their tips abutted against the band member 11 and advance while bending the band member 11. The tightening jigs 7b and 7c are connected to the guide portion 7b on the tip side.
3 and 7c3 are guided by the guide portion 7a2 of the tightening jig 7a to reach the outer periphery of the large diameter portion 6a, and as shown in FIG. 3b, the band member 11 is pressed against the outer periphery of the large diameter portion 6a. At this time, the tips of the tightening jigs 7a, 7b, 7c are aligned with each other in the circumferential direction, and the band member 11 is wound by about a semicircle of the large diameter portion 6a. The tightening jigs 7b and 7c hold this advanced position.

Next, the cylinder 8d is operated to drive and advance the tightening jig 7d to the boot 6 side. Tightening jig 7d
Makes the tip contact the band member 11 and
It advances while curving. And the tightening jig 7
3d reaches the outer circumference of the large diameter portion 6a by being guided by the guide portion 7d3 of the tip side portion by the guide portion 7b2 of the tightening jig 7b,
As shown in, the right end of the band member 11 is connected to the large diameter portion 6a.
Press on the outer circumference of. At this time, the tightening jigs 7a, 7b, 7
The tips of c and 7d are fitted to each other in the circumferential direction, and the right half of the band member 11 is wound around the right half of the large diameter portion 6a. The tightening jig 7d holds this advanced position.

Next, the cylinder 8e is actuated to drive and advance the tightening jig 7e to the boot 6 side. Tightening jig 7e
Makes the tip contact the band member 11 and
It advances while curving. And the tightening jig 7
3e reaches the outer circumference of the large-diameter portion 6a by guiding the guide portion 7e3 on the tip side to the guide portion 7c2 of the tightening jig 7c, and
As shown in, the left end of the band member 11 is connected to the large diameter portion 6a.
Press on the outer circumference of. At this time, the tightening jigs 7a, 7b, 7
The tips of c, 7d, and 7e are fitted to each other in the circumferential direction, and the tip of the tightening jig 7 forms one partial ring adapted to the outer circumference of the large diameter portion 6a as a whole. The left half of the band member 11 is also completely wound around the left half of the large-diameter portion 6a, and the left end overlaps the right end.

In FIG. 2, S1 shows the movement locus of the band member 11 at the right end, and S2 shows the movement locus of the left end. When the winding of the band member 11 is completed in this way, finally, the overlapping portions of both ends of the band member 11 are coupled to each other. This is because, for example, as shown in FIG. 3d, the electrode 12 for welding is arranged at a substantially intermediate position between the tightening jigs 7d and 7e so as to be movable back and forth, and when the winding of the band member 11 is completed, the electrode 12 Can be carried out by pressing and setting the overlapping parts of the band member 11 and welding both end parts to each other. When the joining of both ends of the band member 11 is completed, each tightening jig 7 retracts and returns to its original position. This completes the fixing of the large diameter portion 6a.

In the embodiment shown in FIG. 4, a tightening jig 7f, on which the electrode 12 is mounted so as to move back and forth, is arranged between the tightening jigs 7d and 7e. The tightening jig 7f is just
The band members 11 are located directly above the overlapping portions of both ends. Like the other tightening jigs 7, the tightening jig 7f is driven forward and backward in the radial direction by a cylinder on a slide rail (not shown). Further, the electrode 12 is connected to a separate drive means (not shown) and can be moved back and forth independently of the tightening jig 7f. After the tightening jigs 7a to 7e have advanced to the boot 6 side in the order shown in FIGS. 3a to 3d, as shown in FIG. 1
The overlapping portion of 1 is pressed against the outer circumference of the large diameter portion 6a.
At this time, the tightening jigs 7a, 7b, 7c, 7d, 7e, 7
The tips of f are circumferentially aligned with each other, and the tips of the tightening jig 7 as a whole form one ring adapted to the outer circumference of the large diameter portion 6a. The tightening jig 7f holds this advanced position. In this state, as shown in FIG. 4f, only the electrode 12 advances to the boot 6 side, is set under pressure in the portion overlapping the band member 11, and welding is performed.

In the fixing device described above, the tightening force (tightening force) of the band member 11 is the pressing force of the tightening jig 7, that is, the cylinder 8 (8a, 8b, 8c).
8d, 8e, 8f), and by controlling the thrust of each cylinder 8, it is possible to manage the tension force with considerable accuracy regardless of the error variation in various dimensions. However, since the winding of the band member 11 and the application of the tightening force are performed at the same time, depending on the relationship between the rigidity, which depends on the material, size and shape of the band member 11, the tip shape of the tightening jig 7, the pressing force, etc. , The following problems may occur. That is, when the band member 11 is strongly pressed against the outer periphery of the large-diameter portion 6a by the tip of the tightening jig 7, the unpressed portion of the band member 11 starts from the arc end of the tip of the tightening jig 7. In some cases, it may be warped outward, and in some cases, it may escape from the advancing path of the tightening jig 7 in the next order, or may be bent. Such a problem can be solved by separately winding the band member 11 and applying the tension force. Specifically,
The thrust of 8 of each cylinder can be switched between high and low two stages,
First, in the order shown in FIG. 3 or FIG.
Is advanced with a low thrust, the band member 11 is wound around the outer periphery of the large diameter portion 6a with a rough tightening force (temporary tightening), and the advanced position of each tightening jig 7 is maintained. The tightening jig 7 is pressure-fed with a high thrust in the same order (the tightening jigs 7d and 7e may be simultaneously pressure-fed), and the band member 11 is gradually rotated around the outer circumference of the large-diameter portion 6a. It is pressurized (finally tightened) to give a predetermined tension. At the time of final tightening of the band member 11, the band member 11 is restrained by the tightening jigs 7 on the outer circumference of the large-diameter portion 6a, so that warping does not occur. Here, "general tension"
The term "tension" refers to a state in which, due to the rigidity of the band member 11, the shape of the tip of the tightening jig 7, etc., the tension force (which corresponds to the thrust force of the cylinder) that causes warpage is not reached.
It includes a state in which no tension is applied to a degree slightly smaller than a predetermined required tension. Desirably, it should be set to a level slightly smaller than the tension force that causes warpage. In this way, fixing the boots,
By performing the two steps of temporary tightening with the main focus on the winding of the band member and full tightening with the main focus on applying the tightening force, the secure fixing without causing the above problems. It becomes possible to perform work.

In the embodiment shown in FIG. 5, the tightening jig 7 (7
a, 7b, 7c, 7d, 7e), a pressure jig 71 is attached so as to be movable back and forth. The pressurizing jig 71 is connected to a driving means that is separate from the tightening jig 7, and can be moved back and forth independently of the tightening jig 7. In addition, the pressure jig 7
1 has a width dimension W2 that is substantially the same as or slightly smaller than the width dimension W1 of the band member 11. The pressure jig 71 is sequentially pressure-fed in the above-described order during the final tightening, and applies a predetermined tightening force to the band member 11 by pressing only the band member 11. The reason why only the band member 11 can be pressurized is that even if the band member 11 and the boot 6 are simultaneously pressed, sufficient tightening force cannot be obtained.
In addition, as a means for pressurizing only the band member 11, for example, the width dimension of the tip portion itself of the tightening jig 7 is set to the band member 1.
Although it is conceivable to make the width dimension W1 equal to 1, it may not always be appropriate. This is because the width dimension W1 of the band member 11 is usually not so large, and if the width dimension of the tightening jig 7 is set correspondingly, there is a possibility that the tightening jig 7 may be concerned about its strength. Because. Therefore, the pressurizing jig 71 is attached to each tightening jig 7 so as to be able to move back and forth, and is differentially fed to the tightening jig 7 during the final tightening. As a result, the strength of the tightening jig 7 can be ensured, and at the same time, only the band member 11 can be pressed, so that the problem of the tightening force and the concern about the strength can be solved at the same time. In this embodiment, for example, each cylinder 8 may be fed in a single step with low thrust, and the pressing jig 71 may be fed under high thrust.

[0025]

As described above, according to the present invention,
The fixing part of the boot The plurality of tightening jigs radially arranged in the radial direction are sequentially operated to gradually wind the band member around the outer periphery of the fixing part to fix the boot. There is no inconvenience in work such as having to pass through the department, and moreover,
The work itself can be automated, and the work of fixing the boot is extremely simplified as compared with the conventional fixing means using a boot band.

Further, since the fixing force of the boot (tightening force of the band member) can be directly controlled by the pressing force and the pressing force of the tightening jig, the fixing state of the boot is always stable and the product quality is high. Improvement is achieved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment.

FIG. 2 is a side view showing the periphery of a large diameter portion 6a of the boot 6 in FIG.

FIG. 3 is a diagram (FIGS. A to d) showing an operating state of the tightening jig 7.

FIG. 4 is a view (FIGS. D to f) showing an operating state of a tightening jig according to another embodiment.

FIG. 5 is a cross-sectional view (FIGS. A and b) showing a tightening jig according to another embodiment.

FIG. 6 is a side view showing the periphery of the small diameter portion 6′b of the boot 6 ′ in FIG.

FIG. 7 is a sectional view showing a boot of a constant velocity universal joint.

FIG. 8 is a side view showing a boot band.

[Explanation of symbols]

 1 Constant velocity universal joint 1'Constant velocity universal joint 6 Boots 6a Large diameter portion 6b Small diameter portion 6'Boots 6'a Large diameter portion 6'b Small diameter portion 7 Tightening jig 7'Tightening jig 11 Band member 11 'Band member 12 electrodes

Claims (5)

[Claims] 1. A constant velocity universal joint fitted with a boot is positioned and held, and a central portion of a band member of a predetermined length is applied to the outer periphery of a fixed portion of the boot, and the tip end thereof has an arc shape that fits the outer periphery of the fixed portion of the boot. Fixed part of the boot A plurality of tightening jigs radially arranged in the radial direction are sequentially driven and advanced to the boot side from those located in the central part of the band member to both sides in the circumferential direction, and the band member is central part. From the both ends to the outer circumference of the fixed part of the boot, the band member is wound around the outer circumference of the fixed part of the boot with a predetermined tightening force, and then the overlapping parts of the both end parts of the band member are mutually A boot fixing device for a constant velocity universal joint, characterized in that the boot is coupled and fixed. 2. A constant velocity universal joint equipped with a boot is positioned and held, and a central portion of a band member of a predetermined length is applied to the outer periphery of the fixed portion of the boot, and the tip end thereof has an arc shape that fits the outer periphery of the fixed portion of the boot. Fixed part of the boot A plurality of tightening jigs radially arranged in the radial direction are sequentially driven and advanced to the boot side from those located in the central part of the band member to both sides in the circumferential direction, and the band member is central part. To the both ends, the band member is wound around the outer periphery of the fixed part of the boot with a squeeze force, and each tightening jig is sequentially pressed from the advanced position. The band member is fed and the band member is gradually pressed from the central part to both end parts to the outer periphery of the fixed part of the boot to apply a predetermined tightening force to the band member, and then the band member. A boot fixing device for a constant velocity universal joint, characterized in that overlapping parts of both ends of a member are coupled to each other to fix the boot. 3. The pressing member according to claim 1, wherein when the band member is pressed / pressurized, the front end portions of the respective fastening jigs are aligned with each other in the circumferential direction, and the front end portions of the fastening jigs form one partial ring as a whole.
Fixing device for boots for constant velocity universal joints. 4. When the band member is pressed or pressed, the tips of the respective fastening jigs are circumferentially aligned with each other, and the tips of the fastening jigs form a ring as a whole. Fixing device for boots for quick joints. 5. An electrode for welding is attached to a tightening jig located at an overlapping portion of the band member so as to be able to move back and forth, and the band member is pressed and pressed, and then the electrode is advanced and brought into contact with the band member. The fixing device for a boot for a constant velocity universal joint according to claim 4, wherein the overlapping portions of the band members are welded to each other.