JP4091688B2 - Boot tightening structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a boot tightening structure in which a tightening band is fitted and tightened to the outer periphery of both ends of a boot used mainly as a dustproof cover for a constant velocity joint or power steering of an automobile.
[0002]
[Prior art]
Conventionally, various tightening bands are fitted and tightened on the outer periphery of both ends of a boot used as a dustproof cover for a constant velocity joint or a power steering of an automobile.
The boots are made of various materials such as rubber and resin. The tightening band has a so-called lever-type tightening band in which the diameter is reduced by bending a lever formed at the end of the band-shaped band member along the peripheral surface, and a tightening ear on the outer band portion. A so-called clamp-type tightening band that reduces the diameter by clamping and crushing the fastening ears of the band member formed in a loop shape, and pulling the outer band part of the band member formed in a loop shape to reduce the diameter, Various things such as a locking type tightening band for locking to the band portion are used, and the sealing performance at the tightening portion of the boot is guaranteed.
[0003]
[Problems to be solved by the invention]
In the conventional boot tightening structure, since the sealing performance of the tightening portion is mainly left to the structure on the tightening band side, various structures for eliminating the steps at the inner and outer band ends of the tightening band are employed. For example, in the case of a clamp band, the tongue formed on the inner band end is accommodated in the concave groove of the corresponding outer band part, or the thickness of the inner band end of the overlapping part of the inner and outer band ends is reduced in the distal direction. Or the step formed on the inner wall surface of the tightening band is absorbed.
[0004]
However, if the tightening band is tightened, the step corresponding to the plate thickness at the inner band end is at any position in the longitudinal direction of the inner band end, even though the effect on the sealing performance of the overlapping portion of the inner and outer band ends is small. Has occurred. Since this level difference appears as an uneven thickness or deformation at the tightening portion of the boot, it is difficult for the tightening band to absorb the tolerance generated in the radial direction or axial direction on the boot side.
In addition, when adding a structure that absorbs the step generated on the inner wall surface to the tightening band, the manufacturing cost increases due to the precise press working on the stainless steel band with a thin plate thickness and narrow width. Since quality control is strictly required, defective products are likely to occur, and the yield is deteriorated.
[0005]
The present invention has been made to solve the above-mentioned problems of the prior art, and the object of the present invention is to eliminate the gap formed between the inner wall surface of the boot and the outer wall surface of the boot by the step of the tightening band on the boot side. An object of the present invention is to provide a boot tightening structure that improves the step absorption accuracy and realizes a reduction in manufacturing cost.
[0006]
[Means for Solving the Problems]
The present invention has the following configuration in order to achieve the above object.
That is, in a boot tightening structure in which a tightening band is fitted on the outer periphery of the end of a resin or rubber boot and the tightening band is reduced in diameter, the tightening band is placed at a predetermined position on the outer periphery of the end of the boot. A bridging portion for covering the gap generated between the inner wall surface of the band and the outer wall surface of the boot by a step generated on the inner wall surface or a protrusion for filling the gap generated between the inner wall surface of the band and the outer wall surface of the boot A part is formed.
According to the above configuration, the bridging portion for closing the gap generated between the inner wall surface of the boot and the outer wall surface of the boot by a step generated on the inner wall surface of the tightening band at a predetermined position on the outer periphery of the end portion of the boot, or the Since the protrusion for filling the gap is formed, it is possible to close or fill the gap generated at the tip of the inner band portion overlapping the bent portion of the band member or the outer band portion on the boot side when the tightening band is tightened. Thus, the flesh on the boot side does not escape and deform, and the level difference absorption accuracy can be improved and the sealing performance can be maintained at a high level.
In addition, since it is not necessary to form a step-absorbing part by applying precise pressing to the tightening band side, the structure of the tightening band can be simplified, and the bridging part and the protrusion can be simplified with a constant quality on the boot side. Since the portion can be provided, the yield can be improved and the manufacturing cost can be reduced.
[0007]
Further, the bridging portion may be a metal plate fitted in a recess formed at a predetermined position on the outer periphery of the boot end or a metal plate attached to a predetermined position on the outer periphery of the boot end. A protrusion may be formed on the plate such that the plate thickness gradually increases toward the step wall of the step generated in the fastening band.
Further, the protrusion is preferably formed so that the plate thickness gradually increases toward the step wall of the step generated in the tightening band, and is protruded integrally with the boot at a predetermined position on the outer periphery of the end of the boot. May be.
The tightening band is a so-called lever-type tightening band in which a lever for tightening is provided at the end of a band member formed in a loop shape, or a tightening ear formed in an outer band portion of the band member formed in a loop shape. Any band may be used, such as a so-called clamp-type tightening band or a so-called locking-type tightening band in which a band member is reduced in a loop shape and the outer band portion is locked to the inner band portion.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is an explanatory view of a boot and a metal plate attached to the boot, FIGS. 2 and 3 are explanatory views of a protrusion formed integrally with the boot, and FIGS. 4A to 4D are fastening bands fitted into the boot. It is explanatory drawing before and behind fastening.
[0009]
A schematic configuration of the boot tightening structure will be described with reference to FIGS.
First, the configuration on the boot side will be described. Reference numeral 1 denotes a resin or rubber boot, which is mounted as a dustproof cover for a constant velocity joint of an automobile or for a power steering. On the outer periphery of the ends of the large-diameter side 2 and the small-diameter side 3 of the boot 1, bridging portions 4a and 5a (see FIG. 1) are respectively formed at predetermined positions in the circumferential direction. The bridging portions 4a and 5a straddle a gap generated between the inner wall surface of the band and the outer wall surface of the boot due to a step generated on the inner wall surface of the tightening band when various tightening bands to be described later are fitted and tightened. It will be closed with.
[0010]
As the bridging portions 4a and 5a, for example, a metal plate 6 such as stainless steel having a thickness of about 0.4 mm is preferably used. The metal plate 6 needs to be formed with a predetermined curvature according to the outer diameter of the boot 1. As shown in FIG. 1, the shape of the metal plate 6 includes a flat plate 6a, a plate 6b having a concave cross section, a plate 6c having a shape in which the flat plate is gradually raised upward toward the stepped wall, or a flat upper surface. Any plate such as a plate 6d formed with protrusions 6e formed so that the plate thickness gradually increases toward the step wall is applicable. The metal plate 6 may be integrally fitted in a recess 8 formed in each of the tightening portions 7 on the large diameter side 2 and the small diameter side 3 of the boot 1, and adhesive or double-sided at the position where the step is generated on the outer peripheral surface of the boot. It may be attached via a tape or the like. When the metal plate 6 is adhered to the tightening portion 7, a recess 8 may be provided on the boot 1 side. However, since the thickness of the metal plate 6 is extremely small compared to the step, the recess 8 is not provided. There is no problem even if it is directly attached to the tightening portion 7. Further, when the fastening band is fitted into the boot 1, it is necessary to fit and fit so that the step generation position corresponds to the position of the metal plate 6.
According to the above configuration, when the boot 1 is tightened by the tightening band, the metal plate 6 is provided at the step generation position generated on the inner wall surface of the band, and therefore, the step is between the inner wall surface of the band and the outer wall surface of the boot. Since the gap can be closed, the flesh on the boot side does not escape and deform into the gap, and the step absorption accuracy can be improved and the sealing performance can be maintained at a high level.
[0011]
Further, as shown in FIGS. 2 and 3, protrusions 4 b and 5 b may be formed at predetermined positions in the circumferential direction on the outer periphery of the ends of the large diameter side 2 and the small diameter side 3 of the boot 1. Further, the protrusions 4b and 5b have a gap generated between the inner wall surface of the band and the outer wall surface of the boot due to a step generated on the inner wall surface of the tightening band when various tightening bands to be described later are fitted and tightened. It is to fill. The protrusions 4b and 5b can be formed by fitting or sticking using the above-described metal plate such as stainless steel. However, the protrusions 4b and 5b are integrally projected at the step generation position on the outer periphery of the end of the resin or rubber boot 1. May be. Since the resin boot 1 is generally manufactured by blow molding, it can be integrally molded by forming a recess in a part of the molding die. Moreover, the shape of the protrusions 4b and 5b may be formed in a part of the tightening portion 7 of the boot 1 in the width direction (see FIG. 2) or in the entire width direction (see FIG. 3). good. Further, the protrusions 4b and 5b positively eliminate the gap formed between the inner wall surface of the band and the outer wall surface of the boot due to the step generated on the band side, so that the plate thickness gradually increases toward the step wall. Is formed.
According to the above configuration, when the boot 1 is tightened with the tightening band, the gap between the inner wall surface of the band and the outer wall surface of the boot can be reliably filled with the protrusions 4b and 5b. It does not escape into the gap and is not deformed, and the step absorption accuracy can be improved and the sealing performance can be maintained at a high level.
Further, by integrally forming the protrusions 4b and 5b on the boot 1, the metal plate 6 is not required, the number of parts can be omitted, and the boot 1 can be mass-produced with a constant quality at a low cost, thereby improving the yield.
[0012]
Next, the configuration of the tightening band that is fitted into the boot 1 and reduced in diameter will be described with reference to FIGS.
As a band suitable for fastening the resin or rubber boot 1, a so-called lever type fastening band 9 shown in FIG. 4A is used. The tightening band 9 has a gap A due to a step in the bent portion 12 when the lever 11 for tightening provided at the end of the band member 10 formed in a loop shape is bent along the outer periphery of the band member 10. Arise. The gap A is compensated by the protrusions 4 and 5 on the boot 1 side. Reference numeral 13 denotes a lever press for suppressing the return of the bent lever 11.
[0013]
Also, a so-called clamp-type tightening band 14 shown in FIGS. 4B and 4C is preferably used. The tightening band 14 includes a gap B due to a step at the end of the inner band portion 18 that overlaps the outer band portion 16 when the tightening ear 17 formed on the outer band portion 16 of the band member 15 formed in a loop shape is tightened. Each yields C. The gaps B and C are absorbed by the protrusions 4 and 5 on the boot 1 side. 4B is a type in which the outer band portion 16 is fixed to the inner band portion 18 by resistance welding, and FIG. 4C is a diagram in which the outer band portion 16 is locked to the inner band portion 18 by holes and protrusions. It is a type of band.
[0014]
Particularly in the rubber boot 1, a so-called inner / outer end locking type tightening band 19 shown in FIG. 4D is preferably used. The tightening band 19 has an inner side overlapping the outer band part 21 when the band member 20 is reduced in a loop shape while pulling the outer band part 21 and the outer band part 21 is locked to the inner band part 22 by a hole and a protrusion. A gap D due to a step is generated at the end of the band portion 22. The gap D is absorbed by the protrusions 4 and 5 on the boot 1 side. Since this tightening band 19 tends to return to the outer band portion 21 in the circumferential direction to tighten the rubber boot 1, a guide 23 formed on the outer band portion 21 is provided with a projection 23 on the inner band portion 22. The inner and outer band members 20 are prevented from shifting by being inserted through holes (not shown).
[0015]
As described above, each of the tightening bands does not need to be subjected to precise press processing or the like to form a step absorption portion, and is only required to have the necessary minimum functions of the conventional band. Since the configuration of the band can be simplified, considering the ease of manufacturing the bridging portions 4a and 5a and the protrusions 4b and 5b provided on the boot 1 side, the manufacturing cost can be reduced as a whole.
[0016]
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and is fitted into the recesses 8 of the boot 1 as the bridging portions 4a and 5a and the protrusions 4b and 5b. Various changes can be made to the shape, material, plate thickness, and the like of the metal plate 6 to be attached or adhered. In addition, even when the protrusions 4b and 5b are integrally formed with the boot 1, the shape can be arbitrarily changed and, of course, more modifications can be made without departing from the spirit of the invention. is there.
[0017]
【The invention's effect】
As described above, the present invention provides a bridging portion for covering a gap generated between the inner wall surface of the band and the outer wall surface of the boot by a step generated on the inner wall surface of the fastening band, and the inner wall surface of the band and the outer wall surface of the boot. Protrusions are provided to fill the gaps that occur between the boot side and the gap on the boot side due to the step formed at the tip of the inner band part that overlaps the bent part of the band member and the outer band part when the tightening band is tightened. The flesh does not escape and deform, and the step absorption accuracy can be improved and the sealing performance can be maintained at a high level.
In addition, since it is not necessary to form a step-absorbing part by applying precise pressing to the tightening band side, the structure of the tightening band can be simplified, and the bridging part and the protrusion can be easily constructed with a certain quality on the boot side. Since the portion can be provided, the yield can be improved and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a boot and a metal plate attached to the boot.
FIG. 2 is an explanatory view of a protrusion formed integrally with a boot.
FIG. 3 is an explanatory view of a protrusion formed integrally with a boot.
FIG. 4 is an explanatory view before and after tightening of a tightening band fitted into a boot.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Boot 2 Large diameter side 3 Small diameter side 4a, 5a Bridging part 4b, 5b Protrusion part 6 Metal plate 7 Tightening part 8 Recessed part 9,14,19 Tightening band 10,15,20 Band member 11 Lever 12 Bending part 13 Lever restraint 16 , 21 Outer band part 17 Fastening ears 18, 22 Inner band part 23 Projection

Claims (10)

In a boot tightening structure in which a tightening band is fitted on the outer periphery of the end of a resin or rubber boot and tightened by reducing the diameter of the tightening band,
A bridging portion is provided at a predetermined position on the outer periphery of the end portion of the boot to bridge a gap generated between the inner wall surface of the band and the outer wall surface of the boot by a step generated on the inner wall surface of the fastening band. And boot tightening structure. The boot fastening structure according to claim 1, wherein the bridging portion is a metal plate fitted in a concave portion formed at a predetermined position on the outer periphery of the end portion of the boot. The boot fastening structure according to claim 1, wherein the bridging portion is a metal plate attached to a predetermined position on the outer periphery of the end of the boot. 4. The boot tightening structure according to claim 2, wherein a protrusion is formed on the metal plate so that the thickness of the metal plate gradually increases toward a step wall of the step generated in the tightening band. In a boot tightening structure in which a tightening band is fitted on the outer periphery of the end of a resin or rubber boot and tightened by reducing the diameter of the tightening band,
A protrusion for filling a gap generated between the inner wall surface of the boot and the outer wall surface of the boot by a step generated on the inner wall surface of the tightening band is provided at a predetermined position on the outer periphery of the end portion of the boot. Boot tightening structure. 6. The boot tightening structure according to claim 5, wherein the protrusion is formed so that a plate thickness gradually increases toward a stepped wall of a step generated in the tightening band. The boot tightening structure according to claim 5 or 6, wherein the protrusion protrudes integrally with the boot at a predetermined position on the outer periphery of the end of the boot. A so-called lever-type tightening band in which a tightening lever is provided at an end portion of a band member formed in a loop shape is used as the tightening band. The boot tightening structure according to claim 6 or 7. The clamp band is a so-called clamp type clamp band having a clamp ear formed on an outer band portion of a band member formed in a loop shape. 6. A boot fastening structure according to claim 7 or claim 7. The said fastening band uses what is called a fastening type fastening band which makes a band member reduce diameter in a loop shape, and latches an outer side band part to an inner side band part. The boot tightening structure according to claim 5, 6 or 7.

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