JPH03572Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a fixing band for a boot on a universal joint, and in particular, to a fixing band for a boot on a universal joint that can securely fix the boot to the universal joint. be.

[Prior art and its problems]

Generally, the state in which the boot is attached to the universal joint is as shown in FIG.

That is, the universal joint 20 has an inner joint member 21
and the outer joint member 22 provided on the outside of the inner joint member 21.
A steel ball 25 held by a retainer 24 is positioned, thereby forming a universal joint 20 in which an outer joint member 22 and an inner joint member 21 are rotatable.

The inner joint member 21 of the universal joint 20 is provided with a driving shaft 26 by spline connection, and the outer joint member 22 is integrally provided with a driven shaft 27.

Then, the drive side shaft 2 of the universal joint 20
The boot 28 provided on the 6 side has a cylindrical shape, and has an enlarged opening edge 29 at one end, an opening edge 30 at the other end, and
A bellows portion 31 is formed between the enlarged opening edge 29 and the opening edge 30, and is further formed of an elastic body through which the driving shaft 26 passes.

The boot 28 as described above is fixed to the outer joint member 22 by a boot fixing band 32 located outside the enlarged opening edge 29 thereof.

As shown in FIGS. 7 and 8, this boot fixing band 32 is made by bending a long steel plate 33 into an annular shape, overlapping both ends thereof, and then attaching a curved member 33 thereto.
and form a ring shape that unites them, and
Opposing upright pieces 35 are provided at predetermined positions on the long steel plate 33.

When fixing the boot 28 to the universal joint 20 using the boot fixing band 32 as described above, first insert the boot 28 or the universal joint 20 into the ring of the boot fixing band 32, and then insert the boot 28 or the universal joint 20 into the universal joint 20. The enlarged opening edge 29 of the boot 28 is fitted onto the outer joint member 22 of the boot 20 .

Then, attach the boot fixing band 32 to the boot 28.
The curved member 34 forming the boot fixing band 32 is folded back, which is located outside the enlarged opening edge 29, thereby reducing the size of the annular ring formed by the long steel plate 33. With universal joint 2
Fixing of the enlarged opening edge 29 of the boot 28 to the universal joint 20 is completed by sandwiching the enlarged opening edge 29 of the boot 28 with the outer joint member 22 of the universal joint 20 and wrapping the curved member 34 with the upright piece 35. It is something to do.

However, in the case of the boot fixing band 32 of the universal joint 20 configured as described above, the surface pressure compressing the enlarged opening edge 29 is almost constant, and its size is also relatively small. Therefore, the grease inside the universal joint 20 leaks to the outside, significantly reducing the internal lubrication performance, or the air inside leaks to the outside, reducing the internal pressure of the boot, which may cause the boot to dent or break. Furthermore, there is a problem in that there is a risk that dust may enter the inside of the boot from the outside, and that the sealing function may be disturbed.

This invention solves the problems of the conventional devices as described above, and aims to provide a fixing band for the boot of a universal joint that can increase the sealing function when the boot is attached to the universal joint. purpose.

[Means for solving problems]

In order to solve the above problems, this invention includes a first band that is elongated and whose ring size can be changed, and a ring that can be located on the inner circumference of the first band. and a second band that is long and slidable in the longitudinal direction of the first band, and the second band has both ends in the width direction that are connected to the first band. This adopts a means in which the members are in contact with each other and the center portions in the width direction are separated from each other.

[Effect]

By adopting the above-mentioned means, this idea
This means that the sealing function when the boot is attached to the universal joint can be significantly improved.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

1 and 2 show the boot fixing band 1 of the universal joint according to this invention attached to the boot 28, and this boot fixing band 1 is shown in FIGS. 7 and 8. The band shown in FIG. 3 is provided inside the ring and the stretched state is shown in FIG. A second band 3 is formed as shown in Figure a.

Since the first band 2 has already been described, a detailed explanation will be omitted, but the second band 3 is integrally provided with two opposing upright pieces 5a and 5b of the long steel plate 4, and further includes an upright piece. The cross-sectional shapes of the portion without the ridge and the portion of the upright piece are as shown in FIGS. 3b and 3c.

In this case, as shown in FIG.
Regarding the plate thicknesses of the first band 2 and the second band 3, the relationship is t2≧t1, where t2 is the thickness of the first band 2, and t1 is the thickness of the second band 3.

When attaching the second band 3 inside the first band 2, the ring-shaped first band 2
A second band 3 is placed in a ring shape inside the 2
The first band 2 is made up of the upright pieces 5a and 5b provided at
By wrapping the first band 2 and the second band 3, the first band 2 and the second band 3 become one, and in this state, there is a predetermined gap δ between both ends of the second band 3. (Figure 5).

This gap δ corresponds to the enlarged opening edge 29 of the boot 28.
The diameter becomes smaller when it is attached to and compressed, but this is to ensure that it can be compressed smoothly at this time.

When attaching the enlarged opening edge 29 of the boot 28 to the outer joint member 22 of the universal joint 20 shown in FIG. Similar to the above, first, the boot 28 or the universal break 20 is inserted into the ring of the boot fixing band 1, and then the enlarged opening edge 29 of the boot 28 is fitted into the outer joint member 22 of the universal joint 20. .

Then, the boot fixing band 1 is positioned outside the enlarged opening edge 29 of the boot 28, and the curved member 34 of the first band 2 forming the boot fixing band 1 is folded back, thereby creating a long plate shape. steel plate 33
The size of the annular ring formed by the ring is reduced, and the size of the ring of the second band 3 located inside the ring is also reduced.

As a result, the enlarged opening edge 29 of the boot 28 is held between the outer joint member 22 of the universal joint 20 and the curved member 34 is wrapped around the upright piece 35, so that the enlarged opening edge 29 of the boot 28 is held relative to the universal joint 20.
The fixation of 9 is completed.

During such attachment, the second band 3 and the first band 2 can be smoothly reduced in size by the gap δ.

Also, when installed, the plate thickness t1 of the second band 3
The relationship between t2 and the thickness t2 of the first band 2 is t2≧t1, and the cross-sectional shape of the second band 3 is such that the portion corresponding to the center of the width of the first band 2 is internal. Since it protrudes in a ring shape over the circumference, the protruding portion compresses the enlarged opening edge 29 of the boot 28, and together with the plate thickness, the tightening force can be increased, and the second The band 3 can generate a peak in surface pressure and can significantly improve the sealing function, and this effect is particularly noticeable when the boot is made of a relatively hard material. be.

In the above embodiment, the first band is formed into a ring shape from the beginning, and the ring can be compressed by folding back the curved member. It is a type that is shaped like a ring after being attached,
Alternatively, it goes without saying that it may be of the caulking type, and in the above embodiment, the case of fixing the enlarged opening edge of the boot was explained, but it may also be used to fix other edges. That is of course true.

[Effect of idea]

By configuring this idea as described above,
In addition to being able to securely fix the boot to the universal joint, it has an extremely simple structure and can be manufactured at low cost, and it has excellent effects such as being able to be formed by adding it to conventional joints. It is something.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a fixing band for a boot of a universal joint according to this invention, and Fig. 2 is a diagram showing C-C in Fig. 1.
A view taken along the line, Fig. 3a shows the state in which the second band is extended, and Fig. 3b shows the A-- of Fig. 3a.
A view taken along line A, Figure 3c is B- in Figure 3a.
A view taken along line B, Figure 4 is an enlarged view of the installation part, Figure 5 is an enlarged view of the part shown in Figure 1, Figure 6 is a view showing the state where the boot is attached to the universal joint, and Figure 7 is an enlarged view of the part shown in Figure 1.
FIG. 8 and FIG. 8 are diagrams showing a conventional universal joint boot fixing band. 1, 32...Fixing band for boots, 2...First
band, 3...second band, 4, 33...steel plate, 5a, 5b, 35...standing piece, 20...universal joint, 21...inner joint member, 22...outer joint member, 23... ...Vacancy, 24...Retainer, 25...
Steel ball, 26... Drive side shaft, 27... Driven side shaft, 28... Boot, 29... Enlarged opening edge, 30... Opening edge, 31... Bellows part, 34...
...Curved member.

Claims (1)

[Claims for Utility Model Registration] (1) A boot fixing band 1 used for fixing a boot 28 to a universal joint 20, the boot fixing band 1 is long and has a large ring. The first band 2 whose intensity can be changed
and a second band 3 which is elongated and can be positioned on the inner circumference of the first band 2 and is slidable in the longitudinal direction of the first band 2. The second band 3 is a universal joint boot fixing band, characterized in that both widthwise ends of the second band 3 are in contact with the first band 2, and a widthwise center part thereof is separated from the first band 2. (2) Both ends of the second band 3 in the longitudinal direction are located inside the first band 2 with a predetermined gap, and the size of the ring shape can be changed within the range of the gap. A fixing band for a boot of a universal joint according to claim 1, which has been registered as a utility model. (3) The second band 3 is provided with upright pieces 5a and 5b extending on both sides at predetermined positions in its longitudinal direction, and after being located on the inner peripheral side of the first band 2, the upright pieces 5a and 5b The fixing band for a boot of a universal joint according to claim 1, which is integrated with the first band 2 by wrapping the first band 2 with the pieces 5a and 5b.