JP2011144851A - Mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a boot for constant velocity universal joint, capable of suppressing deterioration of sealing performance even in use under high-temperature environment, and securing stable sealing performance over a long period of time, and a mounting structure of a dynamic damper capable of stably preventing resonance vibration even in use under high-temperature environment. <P>SOLUTION: The mounting structure is configured to attach a mounting body M on a shaft S extending from a constant velocity universal joint by fastening a band in a state where an outer fitting portion is fitted onto the shaft S. A seal member 81 smaller in compression permanent distortion than the mounting body M is interposed between the band 72 and the outer fitting portion G of the mounting body M, and the seal member 81 has elastic restoring force under a high-temperature environment of general atmosphere where it is used. The mounting body M is a resin boot 70 for constant velocity universal joint or a dynamic damper 100. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mounting structure for fixing a constant velocity universal joint boot or the like that secures the sealing performance of a constant velocity universal joint incorporated in, for example, a power transmission mechanism of an automobile or various industrial machines.

  FIG. 6 shows a tripod type constant velocity universal joint which is a sliding type constant velocity universal joint. This constant velocity universal joint is provided with three track grooves 1 extending in the axial direction on the inner periphery and inside each track groove 1. An outer joint member 2 having roller guide surfaces 1a facing each other on a wall, a tripod member 4 having three leg shafts 3, and a track of the outer joint member 2 supported rotatably on the leg shaft 3 And a roller 5 inserted into the groove 1 so as to roll freely.

  The outer joint member 2 includes a mouth portion 2a and a stem shaft 2b that are integrally formed. The mouse portion 2a has a cup shape opened at one end, and three track grooves 1 extending in the axial direction are formed on the inner peripheral surface thereof. The tripod member 4 includes a boss 6 and the leg shaft 3. The leg shaft 3 protrudes in the radial direction from the circumferentially divided position of the boss 6.

  The roller 5 includes an inner roller 5a and an outer roller 5b. The inner roller 5a is fitted on the leg shaft 3, and the outer roller 5b is fitted on the inner roller 5a via rollers (needle rollers) 8. Yes. In this case, the adjacent rollers 8 are arranged in the form of full rollers in contact with each other.

  A female spline 9 is formed on the inner surface of the boss 6, a shaft 10 is inserted into the boss 6, and a male spline 11 provided on the shaft 10 is fitted into the female spline 9 of the boss 6. 10 and the tripod member 4 are coupled so that torque can be transmitted. At this time, a circumferential groove 12 is provided at the tip of the shaft 10, and a circlip 13 is fitted in the circumferential groove 12. As a result, the axial detachment of the shaft 10 from the boss 6 is restricted.

  In such a constant velocity universal joint, a constant velocity universal joint boot 20 is mounted for the purpose of preventing foreign matters such as dust from entering the joint and preventing leakage of grease sealed in the joint. The constant velocity universal joint boot 20 includes a large-diameter portion 20a, a small-diameter portion 20b, and a bellows portion 20c that connects the large-diameter portion 20a and the small-diameter portion 20b. Such boots include resin boots (thermoplastic elastomer boots) and rubber boots (CR boots). Thermoplastic elastomer boots have excellent properties such as moldability, fatigue resistance, wear resistance, and high-speed rotation (running performance during rotation) as compared with CR boots, and have been widely used in recent years.

  The large-diameter portion 20a is fitted on the boot mounting portion 21 provided on the outer-diameter surface opening side of the mouth portion 2a of the outer joint member 2, and the boot band 22 is tightened, whereby the large-diameter portion 20a is attached to the boot. It is fixed to the part 21. In addition, the small diameter portion 20 b is externally fitted to the boot mounting portion 23 of the shaft 10 and the boot band 24 is tightened, whereby the small diameter portion 20 b is fixed to the boot mounting portion 23.

  In this case, as described in Patent Document 1 and the like, circumferential grooves 25 and 26 are formed on the outer diameter surfaces of the large diameter portion 20a and the small diameter portion 20b. The boot bands 22 and 24 are fitted. The boot mounting portion 23 of the shaft 10 is provided with a concave circumferential groove 28, and circumferential ridges 29 and 30 are provided at the opening end of the concave circumferential groove 28. For this reason, by tightening the boot band 24 on the small diameter portion 20b side, the circumferential ridges 29 and 30 of the shaft 10 bite into the inner diameter surface of the small diameter portion 20b. This ensures sealing performance.

Japanese Utility Model Publication No. 4-128536

  A thermoplastic elastomer boot has a larger compression set than a rubber boot, and the repulsive force tends to decrease. Therefore, the sealing performance tends to decrease due to changes over time. In particular, this tendency is remarkable under a high temperature environment (high temperature atmosphere) on the differential gear side (inboard side), and the deterioration of the sealing performance of the boot is accelerated.

  Therefore, in the conventional seal structure as shown in FIG. 6, it is difficult to exert a stable sealing function for a long period of time, and grease leakage occurs between the boot 20 and the shaft 10 due to a decrease in sealing performance. There are things to do. Due to a decrease in elastic restoring force (repulsive force) due to compression set of the boot 20 under a high temperature environment (for example, at 130 ° C.) during joint operation, the sealing performance between the boot 20 and the shaft 10 is reduced. To do. That is, the tightening of the band 24 causes a so-called sag in the boot band corresponding portion of the boot 20, and the boot band corresponding portion of the boot 20 cannot be brought into close contact with the shaft 10. The same applies to the relationship between the boot 20 and the outer joint member 2.

  Incidentally, a rotating body such as a drive shaft of an automobile has a vibration amplification phenomenon due to resonance vibration. In order to ensure the riding comfort and quietness required for automobiles, it is necessary to prevent this resonance vibration. Therefore, what is called a dynamic damper is mounted on such a drive shaft.

  The dynamic damper holds a short cylindrical fixing portion (attachment portion) attached to the shaft, a short cylindrical weight portion (weight portion) provided on the outer peripheral side of the fixing portion, and a weight portion on the fixing portion. And a holding part for. The fixing portion is made of a flexible resin such as rubber.

  The dynamic damper is fixed to the shaft by fastening a short cylindrical fixing portion via a band such as the boot band. Therefore, if a dynamic damper in a high temperature environment (high temperature atmosphere) is exposed, even if the band tightening force does not change, the adhesiveness of the fixed portion may decrease. If the adhesiveness is thus reduced, the effect of preventing resonance vibration is reduced.

  Therefore, in view of such a situation, the present invention can suppress a decrease in sealing performance even when used in a high temperature environment, and can maintain a stable sealing performance over a long period of time. It is an object of the present invention to provide a dynamic damper mounting structure capable of stably preventing resonance vibration even when used in a high temperature environment.

  A first attachment structure of the present invention is an attachment structure in which an attachment body is attached to a shaft by tightening a band in a state in which an outer fitting portion is externally fitted to a shaft extending from a constant velocity universal joint. A seal member having a compression set smaller than that of the mounting body is interposed between the fitting portion and the seal member has an elastic restoring force in a high temperature environment of a normal atmosphere in which it is used. Here, the compression set is a rate of permanent deformation of rubber subjected to a compression load for a long time.

  The second mounting structure of the present invention is a mounting structure in which a mounting body is attached to an outer joint member by tightening the band in a state where the outer fitting portion is fitted to the outer joint member of the constant velocity universal joint. A seal member having a compression set smaller than that of the mounted body is interposed between the outer fitting portion of the body and the seal member has an elastic restoring force in a high temperature environment of a normal atmosphere in which it is used.

  According to the first and second mounting structures of the present invention, the mounting body and the shaft (in the high temperature environment at the time of joint operation) are caused by a decrease in elastic restoring force (repulsive force) due to compression set of the mounting body. Or a state in which a predetermined sealability (adhesion) cannot be obtained between the outer joint member and the outer joint member, that is, a state where a so-called “sagging” occurs when the mounting body is tightened by a band, Since the amount of compression set of the seal member is small, no “sag” occurs in the seal member by tightening with the band, and the mounting body can be brought into close contact with the shaft (or the outer diameter surface of the outer joint member). That is, the sealing member secures sealing performance (adhesion) in place of the mounting body.

  The mounting body may be a resin boot for a constant velocity universal joint or a dynamic damper. Even if the sealing member is vulcanized and integrated with the band, the sealing member may be bonded to the band via an adhesive. Further, the thickness of the seal member can be 5 mm or less.

  In the mounting structure of the present invention, even in a high temperature environment, the sealing member can secure sealing performance (adhesion) instead of the mounting body, and can exhibit stable sealing performance (adhesion performance). In particular, since the sealing member has an elastic restoring force even in a high temperature environment, the deterioration of the sealing member due to the heat effect is stably prevented, and the deterioration of the sealing performance (adhesion performance) is suppressed.

  If the mounting body is a resin boot for constant velocity universal joints, stable sealing performance will be demonstrated, and it will be possible to improve the reliability of preventing foreign matter such as dust from entering the joint and preventing leakage of grease sealed inside the joint. be able to.

  If the mounting body is a dynamic damper, stable adhesion performance is exhibited, and resonance vibration can be stably prevented even when used in a high temperature environment.

  If the seal member is vulcanized and integrated with the band, the band and the seal member are not separated, and the handleability is excellent. If the sealing member is bonded to the band through an adhesive, the sealing member and the band can be manufactured separately, and the productivity is excellent. In addition, by setting the thickness of the seal member to 5 mm or less, the mounting body can be connected to the shaft (or the outer joint member) via the seal member even if the mounting body is in a state of causing a so-called “sag” via the seal member. ) In a stable manner.

It is sectional drawing of the constant velocity universal joint using the attachment structure which shows embodiment of this invention. It is a principal part enlarged view of the said attachment structure. It is a side view of the band of the said attachment structure. It is sectional drawing of the drive shaft using the attachment structure which shows embodiment of this invention. FIG. 5 is a cross-sectional view of a dynamic damper attached to the drive shaft shown in FIG. 4. It is sectional drawing of the constant velocity universal joint using the conventional attachment structure.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 shows a sectional view of a constant velocity universal joint using the mounting structure according to the present invention. This constant velocity universal joint is a tripod type constant velocity universal joint which is a sliding type constant velocity universal joint. Three track grooves 51 extending in the axial direction are provided on the inner periphery, and inner walls of the track grooves 51 are mutually connected. An outer joint member 52 provided with opposing roller guide surfaces 51 a, a tripod member 54 having three leg shafts 53, and rotatably supported by the leg shaft 53 and in the track groove 51 of the outer joint member 52. And a roller 55 inserted so as to be freely rollable.

  The outer joint member 52 includes a mouth portion 52a and a stem shaft 52b that are integrally formed. The mouse portion 52a has a cup shape opened at one end, and three track grooves 51 extending in the axial direction are formed on the inner peripheral surface thereof. The tripod member 54 includes a boss 56 and the leg shaft 53. The leg shaft 53 protrudes in the radial direction from the circumferentially divided position of the boss 56.

  The roller 55 includes an inner roller 57 and an outer roller 58, and the inner roller 57 is fitted on the outer peripheral surface of the leg shaft 53. The inner roller 57 and the outer roller 58 are unitized via a plurality of needle rollers 59 to constitute a roller cassette C that can be relatively rotated. That is, the cylindrical outer peripheral surface of the inner roller 57 is the inner raceway surface, and the cylindrical inner peripheral surface of the outer roller 58 is the outer raceway surface, and the needle rollers 59 are rotatably interposed between these inner and outer raceway surfaces. The needle roller 57 is incorporated in a so-called full roller state in which as many rollers as possible are inserted and no cage is provided.

  A female spline 60 is formed on the inner surface of the boss 56, and the shaft S is inserted into the boss 56, and a male spline 61 provided on the shaft S is engaged with the female spline 60 of the boss 56, whereby the shaft S and the tripod member 54 are coupled so that torque can be transmitted. At this time, a circumferential groove 62 is provided at the tip of the shaft S, and a circlip 63 is fitted in the circumferential groove 62. As a result, the axial detachment of the shaft S from the boss 56 is restricted. A retaining ring 65 that prevents the tripod member 54 from coming off is attached to the inner diameter surface of the mouth portion 52 a of the outer joint member 52.

  In such a constant velocity universal joint, a constant velocity universal joint boot 70 as a mounting body M is mounted for the purpose of preventing foreign matter such as dust from entering the joint and preventing leakage of grease sealed in the joint. Yes. The constant velocity universal joint boot 70 includes a large-diameter portion 70a as an external fitting portion G1, a small-diameter portion 70b as an external fitting portion G2, and a bellows portion 70c that connects the large-diameter portion 70a and the small-diameter portion 70b. . The boot 70 is a resin boot (a thermoplastic elastomer boot).

  The large-diameter portion 70a is fitted on the boot mounting portion 71 provided on the outer diameter surface opening side of the mouth portion 52a of the outer joint member 52, and the boot band 72 is tightened, whereby the large-diameter portion 70a is mounted on the boot. It is fixed to the part 71. Further, the small diameter portion 70 b is externally fitted to the boot mounting portion 73 of the shaft S and the boot band 74 is tightened, whereby the small diameter portion 70 b is fixed to the boot mounting portion 73. As shown in FIG. 3, the boot band 72 (74) is a so-called omega band having an omega (Ω) shaped clamp portion 67 in this embodiment. This omega band obtains a clamping force by caulking the clamp part 67.

  A concave groove 75 is provided in the boot mounting portion 71 of the mouth portion 52a of the outer joint member 52, and the inner diameter surface of the large-diameter portion 70a is fitted in a state of being tightened by the boot band 72. The boot mounting portion 73 of the shaft S is provided with a circumferential groove 76, and circumferential ridges 77 and 78 are provided at both opening ends of the circumferential groove 76.

  Circumferential grooves 79 and 80 are provided on the outer diameter surface of the large diameter portion 70a and the outer diameter surface of the small diameter portion 70b, respectively. The boot bands 72 and 74 tighten the large-diameter portion 70a and the small-diameter portion 70b through the seal members 81 and 81 fitted into the concave grooves 79 and 80, respectively.

  The seal member 81 has a smaller amount of compression set than the material of the boot 70. That is, the material of the boot 70 is, for example, a thermoplastic polyester elastomer having a type D durometer hardness of 35 or more and 50 or less according to JIS K 6253, and the compression set of the seal member 81 is smaller than that of the thermoplastic polyester elastomer. Moreover, the large-diameter portion 70a and the small-diameter portion 70b have elastic restoring force when the joint is operated (at a high temperature of about 130 ° C.). Here, the compression set is a rate of permanent deformation of rubber subjected to a compression load for a long time.

  For this reason, the seal member 81 preferably has a heat resistant limit temperature of 130 ° C. or higher, such as acrylic rubber (ACM), hydrogenated nitrile rubber (HNBR), ethylene propylene rubber (EPDM), silicon rubber (VMQ, FVMQ, etc.), Or fluororubber (FKM, FFKM, FEPM, etc.) etc. are suitable.

  As described above, in the present invention, the mounting body M (boot 70) is provided between the band (boot band 72) and the outer fitting portion (large diameter portion 70a or small diameter portion 70b) of the mounting body M (boot 70). Also, a seal member 81 having a small compression set is interposed. In this case, the sealing member 81 may be vulcanized and integrated with the band 72 or may be bonded to the band 72 via an adhesive.

  Here, vulcanization is a kind of crosslinking reaction, and is a step of adding sulfur or the like to ensure elasticity and strength when processing rubber-based raw materials (raw rubber, etc.). In response to multiple bonds in the molecule of the material, new sulfur-mediated intermolecular bonds are created. By this reaction, the molecular weight of the material increases, and the elasticity and strength of the rubber are dramatically improved accordingly.

  In the case of bonding via an adhesive, the adhesive to be used can be variously selected depending on the material of the boot 70, the material of the seal member 81, and the like. be able to.

  In the mounting structure of the present invention, the mounting body (boot 70) and the shaft S are caused by a decrease in elastic restoring force (repulsive force) due to compression set of the mounting body (boot 70) in a high temperature environment during joint operation. (Or the outer diameter surface of the outer joint member 52) in a state where a predetermined sealability (adhesion) cannot be obtained, that is, the mounting body (boot 70) is tightened by the bands 72 and 74, so-called "sagging" ”Occurs, the amount of compression set of the sealing member 81 is small, so that the“ sagging ”does not occur in the sealing member 81 due to the tightening by the bands 72 and 74, and the mounting body (boot 70) is attached to the shaft S ( Alternatively, it can be brought into close contact with the outer diameter surface of the outer joint member 52. That is, the sealing member 81 can secure sealing performance (adhesion) in place of the mounting body M, and can exhibit stable sealing performance (adhesion performance). In particular, since the sealing member 81 has an elastic restoring force even in a high temperature environment, the deterioration of the sealing member 81 due to the heat effect is stably prevented, and the deterioration of the sealing performance (adhesion performance) is suppressed.

  The thickness of the seal member 81 is slightly different depending on the material of the boot 70 to be used, the thickness of the large diameter portion 70a and the small diameter portion 70b, the diameter of the large diameter portion 70a and the small diameter portion 70b, and the like. When the material of the boot 70 is a thermoplastic elastomer and the material of the seal member 81 is a nitrile rubber, it is preferably 1 mm or more and 5 mm or less.

  The reason why the thickness of the sealing member 81 is 1 mm or more is that when the thickness is less than 1 mm, the thickness is too small and it is difficult to secure the sealing property (adhesion) in place of the mounting body (boot 70). . Further, the thickness of the seal member 81 is set to 5 mm or less. If the thickness exceeds 5 mm, the thickness is too large, the tightening force with respect to the boot 70 is reduced, and the boot 70 cannot exhibit stable sealing performance.

  Next, FIG. 4 shows a drive shaft to which the dynamic damper 100 is mounted. The mounting of the dynamic damper 100 to the drive shaft is performed through the mounting structure according to the present invention.

  The drive shaft is connected to the intermediate shaft 101 (S), the fixed type constant velocity universal joint 102 connected to one end of the intermediate shaft 101 (S), and the other end of the intermediate shaft 101 (S). The sliding type constant velocity universal joint 103 is provided. The sliding type constant velocity universal joint 103 in this case is the tripod type constant velocity universal joint shown in FIG.

  The fixed type constant velocity universal joint 102 includes an outer joint member 105 in which a plurality of track grooves 104 are formed in the inner spherical surface 103 along the axial direction at equal intervals in the circumferential direction, and a track groove of the outer joint member 105 in the outer spherical surface 106. 104, a plurality of track grooves 107 paired with the inner joint member 108 formed along the axial direction at equal intervals in the circumferential direction, a track groove 104 of the outer joint member 105, and a track groove 107 of the inner joint member 108. A plurality of balls 109 that transmit torque by interposing them, and a cage 110 that interposes between the inner spherical surface 103 of the outer joint member 105 and the outer spherical surface 106 of the inner joint member 108 and holds the balls 109. Yes.

  The outer joint member 105 includes a mouth portion 105a having the track groove 107, and a stem portion 105b protruding from the bottom wall of the mouth portion 105a. The inner joint member 108 has a female spline 111 formed on the inner diameter surface of the hole, and the other end of the intermediate shaft 101 is fitted into the hole. In this case, a male spline 112 is formed on the outer diameter surface of the other end of the intermediate shaft 101, and the male spline 112 of the shaft 101 and the female spline 111 of the inner joint member 108 are spline-fitted.

  Further, the opening of the outer joint member 105 is closed by a boot 115 as the mounting body M. The boot 115 includes a large diameter portion 115a, a small diameter portion 115b, and a bellows portion 115c that connects the large diameter portion 115a and the small diameter portion 115b. The large diameter portion 115a is externally fitted to the boot mounting portion 116 on the outer diameter surface opening side of the mouse portion 105a. By tightening the boot band 120 in this state, the large diameter portion 115a is attached to the boot mounting portion 116 of the mouse portion 105a. Installed. The small diameter portion 115b is fitted on the boot mounting portion 117 of the shaft 101, and the boot band 121 is tightened in this state, whereby the small diameter portion 115b is mounted on the boot mounting portion 117 of the shaft 101.

  Also in this case, the seal member 81 is interposed between the large diameter portion 115 a of the boot 115 and the boot mounting portion 116 of the outer joint member 105, and the small diameter portion 115 b of the boot 115 and the boot mounting portion 117 of the shaft 101. A seal member 81 is interposed therebetween. The outer diameter surface of the boot mounting portion 116 of the outer joint member 105 is provided with a circumferential groove in which the inner diameter portion of the large diameter portion 115a of the boot 115 is fitted, and the boot mounting portion 117 of the shaft 101 has a sliding surface. Like the boot mounting portion 73 on the dynamic constant velocity universal joint side, a circumferential groove and a pair of circumferential ridges at both openings of the circumferential groove are provided. Further, a circumferential concave groove into which the boot band 120 is fitted through the seal member 81 is formed on the outer diameter surface of the large diameter portion 115a of the boot 115, and the outer diameter surface of the small diameter portion 115b of the boot 115 is A circumferential groove is formed in which the boot band 121 is fitted via the seal member 81.

  The seal member 81 has the same configuration as the seal member 81 shown in FIGS. For this reason, even this fixed type constant velocity universal joint has the same effects as the mounting structure used in the sliding type constant velocity universal joint shown in FIG.

  As shown in FIG. 5, the dynamic damper 100 attached to the shaft 101 has a short cylindrical fixing portion (attachment portion) 125 attached to the shaft 101 and a short cylindrical shape provided on the outer peripheral side of the fixing portion 125. A weight part (weight part) 126 and a holding part 127 for holding the weight part 126 on the fixing part 125 are provided. The holding portion 127 is connected to the fixing portion 125 via a connecting portion 128 disposed on the outer diameter side of the fixing portion 125. The holding portion 127 is configured by an outer skin that surrounds the weight portion 126.

  The fixing portion 125, the connecting portion 128, and the holding portion 127 are integrally molded products made of a resin such as a thermoplastic polyester elastomer, as in the boot material. In this case, a part of the fixing portion 125 protrudes in the axial direction (in this embodiment, the sliding constant velocity universal joint side) from the holding portion 127 to form a band mounting portion 130, and the band mounting portion 130 The band mounting part 130 is attached to the shaft 101 by tightening the band 132 to be mounted.

  A circumferential groove 131 is provided on the outer diameter surface of the band attaching portion 130, and a band 132 similar to the boot band 72 (74) is attached to the circumferential groove 131 via a seal member 81. Tighten. For this reason, the dynamic damper 100 exhibits stable adhesion performance and can stably prevent resonance vibration even when used in a high temperature environment.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and various modifications are possible. In the above embodiments, an omega band is used as a band. A so-called one-touch type boot band provided with an operation part by expanding and contracting the ring part may be used. In the above embodiment, a thermoplastic polyester elastomer having a type D durometer hardness of 35 or more and 50 or less according to JIS K 6253 is used as a boot material. However, a type D durometer hardness of 50 or more and 70 or less according to JIS K 6253 is used. It may be a rubber material. In other words, the sealing member 81 may be any member that has a compression set smaller than that of the mounting body (boot or the like) and has an elastic restoring force in a high-temperature environment of a normal atmosphere to be used. In addition, as a constant velocity universal joint using the mounting structure according to the present invention, other sliding type constant velocity universal joints such as tripod type and cross groove type, fixed types such as Zepper type, Barfield type, undercut free type, etc. A constant velocity universal joint can be used.

52 Outer joint members 72 and 74 Band 81 Seal member 100 Dynamic damper 120 Boot band 121 Boot band 132 Band M Mounted body S Shaft

Claims (7)

An attachment structure for attaching a mounting body to a shaft by tightening a band in a state where an outer fitting portion is fitted on a shaft extending from a constant velocity universal joint,
A seal member having a compression set smaller than that of the mounting body is interposed between the band and the outer fitting portion of the mounting body, and the sealing member has an elastic restoring force in a high temperature environment of a normal atmosphere in which it is used. Mounting structure characterized by A mounting structure for attaching a mounting body to an outer joint member by tightening a band in a state in which an outer fitting portion is fitted on an outer joint member of a constant velocity universal joint,
A seal member having a compression set smaller than that of the mounting body is interposed between the band and the outer fitting portion of the mounting body, and the sealing member has an elastic restoring force in a high temperature environment of a normal atmosphere in which it is used. Mounting structure characterized by   The mounting structure according to claim 1, wherein the mounting body is a resin boot for a constant velocity universal joint.   The mounting structure according to claim 1, wherein the mounting body is a dynamic damper.   The mounting structure according to claim 1, wherein the seal member is vulcanized and integrated with a band.   The mounting structure according to any one of claims 1 to 4, wherein the seal member is bonded to the band via an adhesive.   The thickness of the said sealing member was 5 mm or less, The attachment structure of any one of Claims 1-6 characterized by the above-mentioned.

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