JPH0740722Y2 - Boot clamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a boot clamp used for tightly binding a resin or rubber boot covering a ball joint portion of a steering mechanism of an automobile from the outer periphery.

[Conventional technology]

Conventionally, there are various boot clamps, one of which is shown in FIG. The boot clamp shown in FIG. 5 is composed of a ring-shaped metal band 1, a screw 2 and a nut 3 for fastening the mating portions 1a and 1b of the band 1, and the nut 3 is a mating member on the left side in the drawing. It is fixed to the portion 1a. In this boot clamp, screw 2
By tightening, the band 1 can be reduced in diameter, and the boot 4 can be tightly bound from the outer periphery, and the inner periphery of the boot 4 can be held by the holding body 5.
Can be tightly fitted to the outer periphery of.

[Problems to be solved by the device]

Then, in the boot clamp of FIG. 5, the band 1
Is determined by the tightening amount of the screw 2, and the diameter of the band 1 does not change unless the screw 2 is loosened. Therefore, when the outer diameter of the boot 4 becomes smaller due to deterioration over time, heat deterioration, etc., the binding force of the band 1 decreases, and the tight fit of the boot 4 to the holder 5 cannot be maintained, and the boot 4 such as water and dust cannot be held. It will not be possible to reliably prevent the intrusion. Therefore, in this boot clamp, since the outer diameter of the boot 4 is reduced, it is necessary to perform maintenance such that the screw 2 is tightened again.

By the way, as proposed in Japanese Utility Model Laid-Open Publication No. Sho 60-196008, a boot clamp is provided with a spring part at the center of the band so that the center part of the band can be expanded and contracted in the circumferential direction, and the tension of the spring part causes the band to expand and contract. There is one that is designed to hold the bondage force by. Therefore, if only the purpose of maintaining the binding force by the band is achieved, the spring portion is
Although it is possible to provide the band 1 at the center of the band 1 shown in the figure, in the case of adopting the above-mentioned spring part, in order to make the binding force uniform, one end with a free end inside the spring part Since it is necessary to stack the plates, the cost is greatly increased, and new problems such as damage to the boot due to the free end of the hard plate occur.

The present invention has been made to address the above-mentioned problems, and an object thereof is to provide an inexpensive boot clamp that suppresses a decrease in the binding force of the band.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the present invention, a ring-shaped band is reduced in diameter by tightening screws which extend outwardly and which are inserted into mating portions facing each other with a predetermined gap. In a boot clamp for tightly binding a resin or rubber boot fitted on the top from the outer periphery, one of the mating portions has a free end radially inward of the screw and receives a tightening force of the screw. The force portion, which is located between the force receiving portion and the mating portion, is connected to the radially outer end of the force receiving portion radially outside of the screw, and the band radially inward of the screw. And a binding force applying portion that is elastically deformed by tightening the screw and urges the band in a diameter reducing direction around the connecting portion with the force receiving portion.

[Action]

In the boot clamp according to the present invention, when mounting it,
That is, when the band is fitted on the outer circumference of the boot and the diameter of the band is reduced by tightening the screw, the binding force applying portion elastically deforms by a predetermined amount and urges the band in the diameter reducing direction. Therefore, after the boot clamp is attached, even if the outer diameter of the boot becomes small due to deterioration over time, heat deterioration, etc., the elastic restoring action of the binding force application portion suppresses the decrease in the binding force due to the band, The function of preventing dust and the like from entering the boot is maintained for a long period of time, and the loosening of the screw is prevented by the reaction force of the binding force applying portion.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a boot clamp 10 according to the present invention. As shown in FIG. 2, the boot clamp 10 is made of a resin (even if made of rubber, which covers the ball joint BJ of the steering mechanism of an automobile. It is used for tightly binding the boot 20 from the outer periphery, and is composed of a ring-shaped band 11 made of a spring steel plate having a predetermined width, and a screw 12 and a nut 13 for reducing the diameter of the band 11.

The band 11 is formed by welding two plates bent and formed into a predetermined shape, has outwardly extending mating portions 11a and 11b that face each other with a predetermined gap, and is shown on the left side in the drawing. A nut 13 is fixed to the mating portion 11a. On the other hand, the mating portion 11b on the right side in the drawing is formed in an inverted U shape, and the screw 12
It is located between the force receiving portion 11b1 having a free end on the radially inner side and having the screw 12 attached to the intermediate portion and receiving the tightening force of the screw 12, and the force receiving portion 11b1 and the mating portion 11a on the left side in the drawing. The screw 12 is connected to the radial outer end of the force receiving portion 11b1 on the outer side in the radial direction of the screw 12 and to the band 11 on the inner side of the screw 12 in the radial direction.
The binding force applying portion 11b2 that elastically deforms by tightening and applies the band 11 in the diameter reducing direction around the connecting portion with the force receiving portion 11b1.
It is composed by. As shown in FIG. 3, the binding force applying portion 11b2 is a mating portion 11a on the left side in the drawing in a free state.
On the other hand, the gap S is formed so as to gradually increase toward the outside, and as shown in FIGS. 1 and 4, when the boot clamp 10 is attached, it is elastically deformed by a predetermined amount. , The band 11 is urged so that its diameter is reduced (in the direction of reduction).

In the boot clamp 10 described above, the band 11 is fitted on the outer periphery of the boot 20 fitted on the end of the gear housing 30, and the mating portions 11a and 11b are brought closer by tightening the screw 12 to the nut 13 to make the band 11. Is attached as shown in FIGS. 11 and 4 by reducing the diameter of the boot. In the attached state, the boot 20 is compressed from the outer periphery by the binding force of the band 11 and is brought into close contact with the outer periphery of the gear housing 30. ing. Therefore, invasion of water, dust and the like into the boot 20 is surely prevented.

Further, in the boot clamp 10 described above, even if the outer diameter of the boot 20 becomes smaller due to deterioration with time, heat deterioration, etc. after the attachment, as shown by the phantom line in FIG. The elastic restoring action suppresses a decrease in the binding force due to the band 11 and maintains the function of preventing water, dust, and the like from entering the boot 20 for a long time, and at the same time, the binding force applying portion.
The reaction force of 11b2 prevents the screw 12 from loosening.

[Effect of device]

In summary, according to the present invention, the binding force applying portion is connected to the radial outer end of the force receiving portion radially outside the screw, and is elastically deformed by tightening the screw to form the force receiving portion. Since the band is configured to urge the band in the radial direction around the connecting part, the length of the binding force application part in the radial direction can be made sufficiently large, and the stroke (bonding force) that keeps the band binding force The elastic return amount of the applying portion) can be increased, and the binding force can be applied appropriately even when the diameter of the band greatly changes. Also, since the force receiving portion has a free end radially inward of the screw and is not in contact with the band,
The movement of the band in the diameter reducing direction is not hindered, and the elastic restoring force of the binding force applying portion allows the band to be smoothly reduced in diameter, thereby suppressing a decrease in the binding force due to the band.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional view showing an embodiment of a boot clamp according to the present invention, FIG. 2 is a view showing a usage state of the boot clamp shown in FIG. 1, and FIG. FIG. 1 is a front view of the band alone shown in FIG. 1, FIG. 4 is an operation explanatory view of a main part of the boot clamp shown in FIG. 1, and FIG. 5 is a partial sectional view showing an example of a conventional boot clamp. Explanation of code 10 …… Boot clamp, 11 …… Band, 11a …… Mating part, 11b …… Mating part (screw mounting part), 11b1 …… Reception part, 1
1b2 …… Banding force application part, 12 …… Screw, 13 …… Nut, 20
…… Boots, 30 …… Gear housing (holding body).

Claims (1)

[Scope of utility model registration request] 1. A resin which is fitted onto a holder by reducing the diameter of a ring-shaped band by tightening screws inserted into mating parts facing each other with a predetermined gap extending outward. In a boot clamp for binding a rubber boot from the outer periphery, one of the mating portions has a force receiving portion that has a free end radially inward of the screw and receives the tightening force of the screw, and the force receiving portion. And between the other side of the mating portion and radially outward of the screw, connected to the radially outer end of the force receiving portion, and radially inward of the screw to the band so as to tighten the screw. A boot clamp, comprising a binding force applying portion that elastically deforms when attached and biases the band in a radial contraction direction around a connecting portion with the force receiving portion.