JPH04190981A - Fixing method for boot - Google Patents

Abstract

PURPOSE:To increase efficiency of assembly of covering members by oscillating and clamping clamping jigs till obtaining the specified clamping force, welding a superposed part of a band member and fixing the boot. CONSTITUTION:When the band member 1 is supplied, a couple of clamping jigs 2 arranged freely liftably at the lower side of the boot 6 are raised and the tips 2a thereof are applied on the peripheral surface 6a of the fixed position via the band member 1. The band member 1 is wound along the peripheral surface 6a of the fixed position by the oscillation of the clamping jigs 2 and both ends 1c thereof are superposed on each other. The clamping jigs 2 are oscillated till attaining a specified oscillation torque value and the boot is clamped. An electrode 11 is lowered and prescrized to set on the superposed part 1b of the band member 1 and welding is performed. When welding is completed, the electrode is raised and the couple of clamping jigs 2 are oscillated in the opposite direction and then, lowered and returned to the initial positions, respectively.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for fixing a boot for a universal joint, etc.

[Prior Art] As shown in FIG. 5, a rubber boot 6 is attached to a universal joint often used in automobiles, various industrial machines, etc. to make the universal joint waterproof and dustproof.

The boot 6 has a large diameter portion 6a attached to an outer ring 20 of a universal joint, a small diameter portion 6b attached to a shaft portion 21, and a boot band 2, respectively.
Fixed by 2. As the boot band 22, the sixth
A one-touch type boot band 22 as shown in the figure is currently widely used. This boot band 22 has both ends 2'2b of which the band member 22a is curved into a ring shape and the palms of the band member 22a are joined together.
A lever 23 made of a material with higher rigidity than the band member 22a is integrally connected to the band member 22a, and the boot 6 is fixed by reducing the inner diameter of the band using the lever action of the lever 23.

[Problems to be Solved by the Invention] According to the above fixing method, the boot 6 is fixed by passing the boot band 22 through the shaft portion 21 of the universal joint and attaching it to the outer circumferential surface of a predetermined boot fixing position, and then pushing the lever 23. This is done by folding it back. However, since the boot band 22 is annular with both ends connected in advance, when assembling the universal joint, the boot band 22 is attached to the shaft portion 2 in advance.
1, the boots 6 cannot be fixed. Further, if it becomes necessary to replace the boot 6 or the boot bunt 22, the universal joint must be disassembled and the shaft portion 21 must be removed. These significantly reduce the efficiency of universal joint assembly and boot or boot bund replacement operations.

In addition, the tightening force of the boot in the above fixing method is obtained due to the elastic restoring force of the boot that has been forcibly deformed due to the difference in the inner diameter of the boot bunt and the outer diameter of the boot. It is.

Therefore, this tightening force naturally differs depending on the amount of elastic deformation of the boot, that is, the above-mentioned dimensional difference.

In other words, in conventional fixing methods, the tightening force is managed indirectly through dimension control, and if there are variations in the various dimensions that are the premise for this, such as manufacturing errors, variations in the tightening force will occur. Due to variations in the tightening force, the fixation of the boot may become unstable.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the inconvenience of having to pass the boot band through the shaft part in advance when fixing the boot, simplify the assembly and replacement work mentioned above, and always maintain stability. An object of the present invention is to provide a method for fixing boots that can obtain a fixed state.

[Means for Solving the Problems] The boot fixing method of the present invention consists of the steps shown below.

■ A bunt member of a predetermined length with convex portions formed on both ends,
The process of supplying the boot to the fixed position attached to the covering member.

■ Apply the tips of the pair of tightening jigs to the outer circumferential surface of the fixed position of the boot via the band member, and while engaging the tips of the tightening jigs with the convex part of the band member, hold the tightening jigs in place. The process of tightening the boots by rocking them until a tightening force of .

■ The process of welding the mutually overlapping parts of band members.

[Function] When the tips of the pair of tightening jigs are applied to the outer circumferential surface of the fixed position of the boot via the band member and the respective tightening jigs are swung in the direction away from each other, the band member fixes the boot. It is wound along the outer circumferential surface. Convex portions are formed at both ends of the band member, and when the tightening jig is swung by a predetermined amount, its tip portion engages with the convex portions. When the tightening jig is further oscillated in this state, the inner diameter of the wound band member is reduced and the boot is tightened. The tightening jig holds that position when it swings until a predetermined tightening force is obtained. Then, when the tightening force is set, the mutually overlapping portions of both ends of the band member are welded.

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

As shown in FIG. 1a, the band member 1 cut into a predetermined length in advance is supplied from a tangential direction below the fixed position of the boot 6 attached to the covering member 10.

Both end portions 1c of the band member 1 are provided with convex portions 1a which are pressed into a shape as shown in FIG.

Furthermore, in this embodiment, both ends 1c are slightly curved inward. When the band member 1 is supplied, a pair of tightening jigs 2 disposed below the boot 6 so as to be able to rise and fall rises, and their tips 2a are brought into contact with the lower surface of the band member 1.

The tip 2a of the tightening jig 2 is formed into a concave shape with approximately the same curvature as the fixed position outer peripheral surface 6a of the boot 6, and as shown in the figure, the tightening jig 2 is attached to the boot 6 side. The distal end portion 2a is applied to the fixed position outer circumferential surface 6a via the bunt member 1 by being slightly pressed. Then, when the pair of tightening jigs 2 are swung by a predetermined amount in the direction away from each other along the fixed position outer circumferential surface 6a, one end surface of the tip portion 2a becomes the convex portion 1a, as shown in FIG. engage. As the tightening jig 2 swings, the band member 1 is wound along the fixed position outer peripheral surface 6a. By winding the band member with a slight time difference, both ends 1c of the band member are overlapped. When the tightening jig 2 is further oscillated in this state until it reaches a predetermined oscillating torque value, the hand member 1 wound around the fixed position outer circumferential surface 6a is applied with a predetermined tightening force to Tighten 6.

That is, in this fixing method, the tightening force of the boot 6 is managed by the swinging torque value of the tightening jig 2. still,
The tightening jig 2 may be swung at high speed until it reaches the engagement position with the convex portion 1a, and then swung at low speed. By doing this, the working time can be shortened. When the tightening force is set, as shown in d of the same figure, the electrode 11
It is lowered and set under pressure to the overlapping portion 1b of the bond member 1, and welding is performed. This welding is performed by ordinary spot-so-to welding, for example, by series welding as shown in FIG. 3A, and by indirect welding as shown in FIG. 3B.

In series welding, two electrodes 1 are placed on the overlapped part 1b.
1 is set under pressure, and the distance between the electrodes 11 is several m5ec to several tens of m5.
This is done by instantaneously energizing the EC motor.

Part a and part b can be simultaneously welded by one energization. Further, depending on the settings of the electrodes, two or more points can be welded instantly. Indirect welding, electrodes 11 are placed on the overlapping portion 1b and the non-overlapping portion.
This is done by applying pressure to the electrodes 11 and instantaneously applying current for several msec to several + m, se, c meters between the electrodes 11. Part a is welded with one energization, but similarly to series welding, two or more points can be welded instantly depending on the electrode settings. When performing welding, for example, as shown in FIG. 3C, a metal claw 12 is interposed between the band member 1 on the lower side of the overlapped portion 1b and the outer peripheral surface of the boot 6. Good too. The interposition of the claw 12 makes it possible to reliably prevent thermal damage to the outer circumferential surface of the boot due to heating of the band member during welding. As mentioned above, the reason why both ends IC of the band member 1 are curved inward in advance is to prevent the worker from getting injured by the warped ends when handling the boots after fixing them, and to prevent the warped ends from being caused by the warped ends. This is because inconveniences such as interference with surrounding members or cuts on the outer circumferential surface of the boot when the covering member is rotated can be eliminated. Instead of curving both ends IC inward in advance, both ends IC may be pressed along the fixed position outer circumferential surface 6a using a holding jig (not shown) after welding.

When welding is completed, the electrode 11 rises, and the pair of tightening jigs 2 swing in opposite directions, then fall, and return to their initial positions. This completes one cycle.

FIG. 4A shows an embodiment in which the tip end 2a of the tightening jig 2 is formed into an arcuate convex shape.

FIG. 4B shows an embodiment in which a roller 20 rotatably supported on a shaft 2b that can swing along a fixed position outer circumferential surface 6a is used as the tightening jig 2.

In the embodiment described above, the tightening force of the boot was managed by the swinging torque value of the tightening jig, but it is also possible to manage the tightening force by the swinging angle of the tightening jig. be. however,
According to this method, indirect tightening force management is achieved through dimensional control, which is substantially the same as in the conventional method.

Further, the tightening jig is not limited to the one illustrated, but any shape that can be engaged with the convex part of the band member and swingable along the outer circumferential surface of the fixed position of the boot can be used. etc. are not particularly asked. However, considering the deformation of the boot during tightening and the reliability of engagement with the protrusion, the tip of the tightening jig should be
It is desirable to have the shape shown in the figure.

[Effects of the Invention] According to the present invention, after a band member of a predetermined length is wound around the outer peripheral surface of the fixing position of the boot, the overlapping portions of the band member are welded to fix the boot. This eliminates the inconvenience of having to insert the boot band into the shaft of the universal joint in advance when fixing the universal joint, and greatly reduces the work involved in assembling covering components such as the universal joint and replacing the boot or boot band. Become more efficient.

In addition, since the tightening force of the boot is set directly, rather than indirectly by dimensional control as in conventional fixing methods, the tightening force due to manufacturing errors of the boot or covering member, etc. There is no variation, and a stable state of fixation of the boots can be obtained at all times.

[Brief explanation of drawings]

Fig. 1 is a structural model diagram showing an embodiment of the present invention, Fig. 2 is a perspective view showing both ends of the band member, Fig. 3A, Fig. 3B
, and 3C are partial cross-sectional views showing the welding process of overlapping parts of the band members. FIGS. 4A and 4B are partial cross-sectional views showing other embodiments of the present invention. 6 is a sectional view showing a boot attached to a universal joint, and FIG. 6 is a side view showing a conventional boot band. 1: Band member 2: Tightening jig 1a: Convex part
2a: Tip part 1b: Overlapping part 6
: Boot 1c: Both ends 6a; Fixed position outer peripheral surface 10
: Covering member patent application Artificial Intelligence Nuti-N Co., Ltd.
Figure 3A (a) Figure 1 (a) a (C) (d) Figure 1II5

Claims (1)

[Claims] (1) A band member of a predetermined length with convex portions formed on both ends is supplied to a fixed position of the boot attached to the covering member, and the tips of a pair of tightening jigs are attached to the boot through the band member. Applying the tightening jig to the outer circumferential surface of the fixed position and engaging the tip of the tightening jig with the convex portion, rock the tightening jig until a predetermined tightening force is obtained to tighten the boot,
A method for fixing boots in which the boots are fixed to a covering member by welding mutually overlapping portions of both ends of a band member.