JP2011179549A - Seal member and ball joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust cover favorable in an assembling property and capable of providing sufficient sealing performance. <P>SOLUTION: An annular member 54 which has an elongation/contraction property in at least a radial direction, elongates and contracts in the radial direction integrally with a socket-side attachment part 47, and can fasten and fix the socket-side attachment part 47 to a cover fixing groove 28 of a socket 16 (socket body 21) is encapsulated in the socket-side attachment part 47 attached to the side of the socket 16 (socket body 21). Thereby, it is possible to assemble the socket-side attachment part 47 to the socket 16 while elongating and contracting the socket-side attachment part in the radial direction without a process for attaching the annular member separately, and the assembling performance becomes favorable. A bonding force corresponding to the side of the socket 16 through the elongation and contraction of the annular member 54 and the socket-side attachment part 47 is obtained, providing a sufficient sealing performance. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seal member having an attachment portion attached to a member to be attached, and a ball joint including the seal member.

  Conventionally, this type of ball joint used for a suspension device of a vehicle such as an automobile or a steering device has a cylindrical socket having an inner chamber and an opening communicating with the inner chamber, and an inner chamber of the socket. A ball seat which is a mounted bearing seat, a ball portion which is slidably held by the ball seat, and a stud portion which protrudes from the ball portion, and the stud portion is inserted through the opening of the socket A stud and a dust cover as a seal member attached between the ball stud and the socket are provided. One end of the dust cover is attached to the stud portion of the ball stud, and the other end is attached to the socket side to cover the opening of the socket and prevent entry of dust and the like into the opening.

  In such a dust cover, there is known a configuration in which an annular clip that fastens the other end-side attachment portion in the direction of the central axis and fixes it to a socket (see, for example, Patent Document 1).

  However, in this configuration, although the sealing performance is excellent, since a step of attaching a clip is required, the number of steps is increased, and a problem such as entanglement of the clip may occur.

  Thus, for example, a configuration is known in which an annular ring is integrally embedded in the attachment portion on the other end side of the dust cover and the one end portion is fixed by being press-fitted into the socket side (see, for example, Patent Document 2). .).

  However, in this configuration, although problems such as increased processes and entanglement of the clip do not occur, the other end of the dust cover does not have elasticity in the radial direction, so assembly is performed when the tightening force of the embedded ring is too strong. However, it is not easy to set the tightness of the ring.

JP-A-8-303448 (page 3, FIG. 3) JP 2000-230540 A (page 5-6, FIG. 1)

  As described above, for example, in a ball joint, a sealing member excellent in assembling property and sealing property is desired.

  The present invention has been made in view of these points, and an object thereof is to provide a seal member that has good assembling properties and that can obtain sufficient sealing properties, and a ball joint including the same. .

  The seal member according to claim 1 is a seal main body provided with an insertion opening into which at least a part of the attached member is inserted, and an attachment formed integrally with the seal main body and attached to the attached member. And an annular member that is enclosed in the mounting portion and that can be expanded and contracted integrally with the mounting portion and capable of fastening and fixing the mounting portion to the mounted member.

  According to a second aspect of the present invention, there is provided a sealing member according to the first aspect, in which the sealing member according to the first aspect is partially attached to a socket as an attached member having an inner chamber and a communication opening communicating with the inner chamber, and the inner chamber of the socket. An attachment portion is attached to the socket of a ball joint including a ball stud that is slidably held, and the ball stud is inserted into a seal main body portion to cover the communication opening.

  The seal member according to claim 3 is the seal member according to claim 1 or 2, wherein the annular member is included in a non-fixed state with respect to the attachment portion.

  According to a fourth aspect of the present invention, there is provided the sealing member according to the third aspect, wherein the annular member is covered in a non-fixed state, and the covering member is included in the attachment portion together with the annular member.

  The seal member according to claim 5 is the seal member according to claim 1 or 2, wherein the annular member is included in a fixed state with respect to the mounting portion.

  The sealing member according to claim 6 is the sealing member according to claim 5, wherein the annular member is formed of a shape memory alloy.

  A seal member according to a seventh aspect is the seal member according to any one of the third to sixth aspects, wherein the annular member is wound at least twice.

  The ball joint according to claim 8 is a socket as a mounted member having an inner chamber and an opening communicating with the inner chamber, and a ball stud partially slidably held in the inner chamber of the socket. The seal member according to any one of claims 1 to 7, wherein an attachment portion is attached to the socket and the ball stud is inserted into a seal member main body to cover the opening.

  According to the seal member according to claim 1, the attachment portion attached to the attached member includes an annular member that can be expanded and contracted integrally with the attachment portion and can be fastened and fixed to the attachment member. For example, it is possible to assemble to the mounted member while expanding and contracting the mounting part without requiring a separate step of attaching the annular member, and the assembling property is improved and the mounted member side is supported by expansion and contraction of the annular member and the mounting part. It becomes possible to obtain a sufficient hermeticity by obtaining a tight binding force.

  According to the seal member according to claim 2, in addition to the effect of the seal member according to claim 1, in the case of a dust cover that covers the communication opening of the socket of the ball joint, the assembly to the socket is improved, By obtaining a binding force corresponding to the socket side by expansion and contraction of the annular member and the mounting portion, it is possible to obtain a sufficient sealing property with respect to the communication opening.

  According to the seal member according to claim 3, in addition to the effect of the seal member according to claim 1 or 2, the annular member is included in a non-fixed state with respect to the attachment portion, thereby being integrated with the annular member. The structure which can expand-contract a part can be formed easily.

  According to the seal member of claim 4, in addition to the effect of the seal member of claim 3, the annular member is included in the attachment portion together with the annular member so as to cover the annular member in a non-fixed state. It can be easily included in a non-fixed state with respect to the mounting portion.

  According to the seal member of claim 5, in addition to the effect of the seal member of claim 1 or 2, by enclosing the annular member in a fixed state in the attachment portion, the attachment portion can be expanded and contracted integrally with the annular member. Possible configurations can be easily formed.

  According to the seal member of claim 6, in addition to the effect of the seal member of claim 5, by forming the annular member from a shape memory alloy, the annular member The mounting portion can be easily expanded and contracted integrally.

  According to the seal member of the seventh aspect, in addition to the effect of the seal member according to any one of the third to sixth aspects, the annular member is formed by winding at least twice so as to be integrated with the annular member. The structure which can extend and contract an attaching part can be formed more easily.

  According to the ball joint of the eighth aspect, by providing the seal member according to any one of the first to seventh aspects, each effect can be achieved.

It is a longitudinal cross-sectional view which shows the ball joint provided with the sealing member of the 1st Embodiment of this invention. It is explanatory sectional drawing which shows a part of manufacturing process of a sealing member same as the above. It is a longitudinal cross-sectional view which shows the ball joint provided with the sealing member of the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the sealing member of the 3rd Embodiment of this invention.

  The configuration of the first embodiment of the present invention will be described below with reference to FIGS.

  In FIG. 1, reference numeral 11 denotes a ball joint. The ball joint 11 is used for a suspension device of a vehicle such as an automobile or a steering device. The ball joint 11 includes a socket 16 that is a housing (one) as a mounted member, a ball sheet 17 that is a bearing seat accommodated in the socket 16, and a part of the ball seat 17 that slides on the ball seat 17. Ball stud 18 as a member to be sealed, which is held so as to be movable (turnable), and a seal member (for a vehicle) arranged from the outer peripheral surface of socket 16 to the outer peripheral surface of ball stud 18 A dust cover 19 as a boot (for a vehicle) is provided.

  The socket 16 has a cylindrical socket body 21 made of metal or the like, and a plug 22 as a disk-like closing member made of metal or the like that is integrally fixed to the socket body 21.

  The socket main body 21 has an inner chamber 24 for accommodating the ball seat 17 inside, and a communication opening that communicates the inner chamber 24 with the outside of the socket main body 21 at one end (the upper end in FIG. 1). A first socket opening 25 which is an opening (one side) as the above, and a closed opening which communicates the inner chamber 24 with the outside of the socket body 21 at the other end (the lower end in FIG. 1). A second socket opening 26 is provided as the (other) opening. Further, the socket main body 21 is formed with a cover fixing groove 28 in the circumferential direction as a cover mounting portion for mounting and fixing the end of the dust cover 19 on the outer peripheral surface on one end side (the upper end side in FIG. 1). . Further, the socket body 21 is formed with a protruding portion 31 protruding in the central axis direction at a continuous portion between the inner chamber 24 and the first socket opening 25, and the inner chamber 24 and the second socket opening 26. A holding portion 32 for holding the plug 22 is formed in a stepped shape at the continuous portion. The socket body 21 is fixed to the socket 16 by fixing the plug 22 by caulking and deforming the other end side (the lower end side in FIG. 1) of the holding portion 32. This is a caulking fixing portion 33 which is a fixing portion for fixing to the head. The socket body 21 is formed by, for example, (cold) forging or casting.

  The first socket opening 25 is formed so as to gradually increase in diameter from the protruding portion 31 on the inner chamber 24 side toward one end side (the upper end side in FIG. 1).

  The second socket opening 26 has a diameter dimension substantially equal to that of the inner chamber 24.

  The cover fixing groove 28 is recessed in the shape of an annular groove over the entire outer peripheral surface of the socket body 21 at a position outside the first socket opening 25.

  Further, the plug 22 is fixed by caulking and fixing with a caulking fixing portion 33 in a state where the peripheral portion is held by the holding portion 32, so that the other end side (the lower end side in FIG. 1) of the inner chamber 24, that is, the second socket. The opening 26 is closed.

  The ball seat 17 is made of, for example, a synthetic resin having excellent wear resistance and a high elastic modulus, and is formed in a cylindrical shape that can be fitted into the inner chamber 24 of the socket body 21. That is, the ball seat 17 has a spherical sliding surface 35 inside, and the first end of the socket body 21 is connected to the sliding surface 35 at one end (upper end in FIG. 1). A first sheet opening 36 as one sheet opening serving as a sheet insertion opening communicating coaxially with the socket opening 25 is provided, and a sliding surface is provided at the other end (the lower end in FIG. 1). A second sheet opening 37 that is the other sheet opening is provided as a sheet communication opening that communicates coaxially with the second socket opening 26 of the socket main body 21 continuously to 35. The ball sheet 17 is held between the projecting portion 31 of the socket body 21 and the plug 22. Note that the ball sheet 17 may be formed by a single member, or may be configured by combining a plurality of members formed of, for example, synthetic resins having different characteristics.

  The ball stud 18 is made of, for example, steel, and integrally includes a spherical ball portion 41 and a stud portion 42 that is the other shaft-like attached member connected to the ball portion 41.

  A part of the outer peripheral surface including the equator (maximum diameter position) of the ball portion 41 is held so as to be slidable (rotatable) on the sliding surface 35 of the ball seat 17. That is, the ball portion 41 is accommodated in the inner chamber 24 of the socket 16 together with the ball seat 17. Further, the ball portion 41 is formed such that the outer diameter dimension of the equator, that is, the maximum outer diameter dimension is substantially equal to the maximum inner diameter dimension of the sliding surface 35 of the ball seat 17. That is, the shape of the outer peripheral surface of the ball portion 41 substantially matches the shape of the sliding surface 35 of the ball seat 17. Further, although not shown, for example, a lubricant (grease) is held between the outer peripheral surface of the ball portion 41 and the sliding surface 35 of the ball seat 17.

  The stud portion 42 is a portion to which a load is applied by being connected to an external member to be connected (not shown). The stud portion 42 is inserted through the openings 36 and 25 and outward from the ball seat 17 and the socket 16 (upward in FIG. 1). And protruding. Further, although not shown, the stud portion 42 has a screw portion (not shown) for connecting to the connected member, and a flange portion (not shown) that forms a seating surface when the screw portion is connected to the connected member. Is formed. The stud portion 42 may be formed integrally with the ball portion 41, or may be formed separately from the ball portion 41 and then integrated with the ball portion 41 by welding or the like.

  The dust cover 19 is also called a dust seal or a boot, and covers the first socket opening 25 of the socket 16 (the first sheet opening 36 of the ball seat 17) regardless of the swinging of the ball stud 18, and the socket. 16 or the ball seat 17 is prevented from entering dust. The dust cover 19 includes a dust cover body 45 as a flat cylindrical seal body having a larger radial dimension than the axial direction, and one end side of the dust cover body 45 (upper end side in FIG. 1). A stud-side mounting portion 46 which is a seal portion (one) mounting portion formed on the other side and a (other) mounting portion formed on the other end side (lower end side in FIG. 1) of the dust cover main body 45. And a socket-side mounting portion 47 that is a tightening fixing portion.

  The dust cover main body 45 is made of a synthetic resin such as chloroprene or urethane, and is formed in a cylindrical shape whose diameter is gradually reduced from the socket side mounting portion 47 side to the stud side mounting portion 46 side. That is, the dust cover main body 45 has a first opening which is an insertion opening portion (one) as an insertion opening portion through which the stud portion 42 of the ball stud 18 is inserted at one end side (the upper end side in FIG. 1). The first socket opening 25 side of the socket 16 (socket body 21) is inserted into the other end side (the lower end side in FIG. 1) and the first socket opening 25 side is inserted as the (other) insertion opening. Two openings 52 are formed. The dust cover main body 45 may have an arbitrary cylindrical shape such as a shape in which an axial intermediate portion bulges outward.

  The stud side mounting portion 46 is formed along the edge portion of the first opening 51 and is in pressure contact with the outer peripheral surface of the stud portion 42 toward the central axis direction. In other words, the stud-side mounting portion 46 is in airtight (liquid tight) contact with the outer peripheral surface of the stud portion 42.

  The socket-side mounting portion 47 is formed along the edge of the second opening 52, and has an elastic property in the radial direction integrally with the included annular member 54. (Inner surface side) is fitted and fixed. Further, the socket-side mounting portion 47 can be expanded from the unloaded state in the diameter increasing direction due to the stretchability of the annular member 54, and is biased in the diameter decreasing direction in the diameter expanded (expanded) state. Therefore, the socket-side mounting portion 47 is pressed against the cover fixing groove 28 in the central axis direction while being fitted in the cover fixing groove 28. In other words, the socket-side mounting portion 47 is in airtight (liquid tight) contact with the socket 16 (socket body 21 (cover fixing groove 28)).

  The annular member 54 is also called a clip or the like, and is made of a metal such as spring steel or stainless steel, and is formed in an annular shape wound twice. That is, the annular member 54 is formed such that coaxial rings 54a and 54a are adjacent to each other in the axial direction with a gap therebetween, and the rings 54a and 54a are continuous at an end continuous portion 54b. The annular member 54 is included in a state where it is not fixed (adhered) to the socket-side mounting portion 47 (non-adhered (non-adhered)). In other words, the annular member 54 is not hindered in elasticity by the socket side mounting portion 47, that is, the elasticity is ensured, and can be expanded and contracted integrally with the socket side mounting portion 47. Yes.

  Next, the operation of the first embodiment will be described.

  When manufacturing the dust cover 19, first, as shown in FIG. 2, the entire annular member 54 formed in advance is covered with an annular tube T that is a hollow covering member. At this time, the tube T is formed of, for example, a synthetic resin member that is not fixed to the annular member 54, so that the annular member 54 is not fixed (non-fixed) to the tube T. The tube T may be formed in a long cylindrical shape in advance and inserted into the annular member 54, and then bonded and fixed at both ends to form an annular shape. Alternatively, the tube T may be formed in a sheet shape in advance around the annular member 54. Then, the ends may be bonded and fixed to form a cylindrical ring.

  Thereafter, the dust cover 19 shown in FIG. 1 is completed by, for example, vulcanization molding (injection molding) using the annular member 54 and the tube T covering the annular member 54 as a core. At this time, the tube T may be integrated with the socket-side mounting portion 47, or may not be integrated with the socket-side mounting portion 47.

  When the ball joint 11 is assembled, for example, the ball seat 17 holding the ball part 41 so as to be slidable (rotatable) by the sliding surface 35 is opened in the inner chamber 24 of the socket body 21 of the socket 16 in the second socket opening. In a state where the plug 22 is inserted from the portion 26, the plug 22 is held by the holding portion 32, the caulking fixing portion 33 is caulked and deformed in the central axis direction, and the plug 22 is integrally fixed to the socket body 21, whereby the ball seat 17 The ball part 41 is accommodated in the socket 16 and the stud part 42 is welded to the ball part 41 from the first socket opening 25 side.

  In this state, the stud portion 42 is inserted into the dust cover 19 from the second opening 52 side of the completed dust cover 19, and the stud portion 42 is further protruded from the first opening 51, so that the socket side mounting portion A state where the socket side mounting portion 47 is positioned in the cover fixing groove 28 of the socket 16 (socket body 21) inserted into the first opening 51 while applying an external force to push the 47 in the diameter increasing direction together with the annular member 54 Thus, by releasing the external force, the socket-side mounting portion 47 is restored and deformed together with the annular member 54 to reduce the diameter, and is fitted into the cover fixing groove 28. In this state, the socket side attaching portion 47 is given a binding force that reduces the diameter in the central axis direction with respect to the cover fixing groove 28 due to the stretchability of the annular member 54.

  As described above, in the first embodiment, the socket-side attachment portion 47 attached to the socket 16 (socket body 21) side is at least radially stretchable and integrated with the socket-side attachment portion 47. It is configured to include an annular member 54 that expands and contracts in the radial direction and can fix the socket side mounting portion 47 to the cover fixing groove 28 of the socket 16 (socket body 21).

  For this reason, the socket-side mounting portion 47 is arranged in the radial direction without requiring a separate step of attaching the annular member to the dust cover as in the conventional case of fastening the dust cover to the socket by an annular member such as a clip. It can be assembled to the socket 16 while being expanded and contracted, and there is no occurrence of entanglement of the clip at the time of assembling, and the assembling property is improved and, for example, an annular member is integrated with the end of the dust cover. As in the conventional case of embedding and press-fitting into the socket side, the socket side mounting portion 47 of the socket 16 is fixed by the expansion and contraction of the annular member 54 and the socket side mounting portion 47 without setting the ring tightening force in advance. A binding force corresponding to the shape (outer diameter) can be obtained, and sufficient sealing performance can be obtained.

  That is, in the case of the dust cover 19 that covers the first socket opening 25 of the socket 16 of the ball joint 11, the assemblability to the socket 16 is improved, and the annular member 54 and the socket-side mounting portion 47 are expanded and contracted. By obtaining a binding force corresponding to the above, it becomes possible to obtain a sufficient sealing property with respect to the first socket opening 25 and to effectively prevent dust from entering from the first socket opening 25.

  In addition, by enclosing the annular member 54 in a non-fixed state with respect to the socket-side attachment portion 47, a configuration in which the socket-side attachment portion 47 can be expanded and contracted in the radial direction integrally with the annular member 54 can be easily formed.

  Specifically, the annular member 54 is attached to the socket side by forming the dust cover 19 as a core together with the annular member 54 and enclosing the tube T that covers the annular member 54 in the non-fixed state in the socket side mounting portion 47. It can be easily included in the non-fixed state with respect to the portion 47.

  Furthermore, by forming the annular member 54 by winding it at least twice, it is possible to more easily form a configuration in which the socket side mounting portion 47 can be expanded and contracted in the radial direction integrally with the annular member 54.

  By providing this dust cover 19, it is possible to obtain a ball joint 11 that is inexpensive and has good sealing performance.

  In the first embodiment, when the dust cover 19 is manufactured, the dust cover main body 45 and the attachment portions 46 and 47 are made of a material not fixed to the annular member 54 with the annular member 54 as a core. The dust cover 19 may be formed by integral molding, or the annular member 54 that has been subjected to surface processing that does not adhere to the material of the dust cover 19 on the surface, for example, attachment of non-affinity members such as oil, etc. The dust cover main body 45 and the mounting portions 46 and 47 may be integrally formed as a child to form the dust cover 19. In these cases, the process of covering the annular member 54 with the tube T in advance is not necessary, and the productivity is improved. In any case, if the annular member 54 is not fixed to the socket side mounting portion 47 and the annular member 54 can be expanded and contracted integrally with the socket side mounting portion 47, the same as in the first embodiment. An effect can be produced.

  Next, a second embodiment will be described with reference to FIG. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the second embodiment, instead of the annular member 54 of the first embodiment, an annular member 56 included in a state of being fixed (adhered) to the socket side mounting portion 47 is provided.

  The annular member 56 is also called a clip or the like, and is formed in an annular shape wound twice. That is, the annular member 56 is formed such that the coaxial rings 56a and 56a are adjacent to each other in the axial direction through a gap, and the rings 56a and 56a are continuous with each other at a continuous portion (not shown). Has been.

  Here, the annular member 56 is formed of, for example, a shape memory alloy. The annular member 56 is included in the socket-side mounting portion 47 in a state where the rings 56a and 56a are not fixed (bonded) to each other. Therefore, the annular member 56 is configured to be at least stretchable in the radial direction and to expand and contract at least in the radial direction integrally with the socket-side mounting portion 47.

  An annular member 56 having at least radial stretchability is enclosed in a socket-side mounting portion 47 formed on the other end side of the dust cover main body 45 so that the socket-side mounting portion 47 can be integrally stretched in the radial direction. By having the same configuration as that of the first embodiment, the same effects as those of the first embodiment can be obtained.

  In addition, by fixing the annular member 56 to the socket-side mounting portion 47, it is possible to easily form a configuration in which the socket-side mounting portion 47 can be expanded and contracted in the radial direction integrally with the annular member 56. By forming the shape memory alloy, even if the annular member 56 is fixed to the socket-side mounting portion 47, the annular member 56 and the socket-side mounting portion 47 can be easily stretched integrally.

  In particular, by winding the annular member 56 twice so that the rings 56a and 56a do not stick to each other, the socket side mounting portion 47 can be expanded and contracted in the radial direction integrally with the annular member 56. Can be easily formed.

  Next, a third embodiment will be described with reference to FIG. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the third embodiment shown in FIG. 4, the annular member 54 of the first embodiment is used for a (vehicle) boot 61 as a (vehicle) seal member.

  The boot 61 is, for example, a constant velocity joint boot that is mounted on a mounted member such as an axle of an automobile that is a vehicle, a rack and pinion boot, a boot that is mounted on a mounted member such as a shift lever, a shaft of a motorcycle that is a vehicle, or the like. A shaft boot attached to the attached member. The boot 61 has a boot body 63 as a seal body formed in a bellows cylindrical shape, and a (one) attachment portion formed on one end side (the upper end side in FIG. 4) of the boot body 63. A first mounting portion 64 that is a sealing portion of the boot and a fastening portion as a mounting portion that is formed on the other end side (the lower end side in FIG. 4) of the boot body 63 and encloses the annular member 54 in a non-fixed state (the other). A second mounting portion 65 that is a fixed portion is integrally provided.

  The boot body 63 is made of synthetic resin such as chloroprene or urethane, and is gradually reduced in diameter from the second mounting portion 65 side to the first mounting portion 64 side. That is, the boot body 63 has an insertion opening 67 through which an insertion member such as an axle is inserted at one end side (upper end side in FIG. 4) and the other end side (lower end side in FIG. 4). ) Is formed with an insertion opening 68 into which a member to be attached (not shown) is inserted. Further, the boot body 63 is elastically deformable in the axial direction due to its bellows shape. The boot main body 63 may have an arbitrary cylindrical shape such as a shape in which an intermediate portion in the axial direction bulges outward.

  The first attachment portion 64 is formed along the edge of the insertion opening 67 and is pressed against the outer surface of the insertion member inserted through the insertion opening 67. In other words, the first attachment portion 64 is in close contact with the outer surface of the insertion member in an airtight (liquid tight) manner.

  The second mounting portion 65 is formed along the edge of the insertion opening 68, and has a radially stretchable integral with the enclosed annular member 54. Side) is fixed. The second mounting portion 65 can be expanded from the unloaded state in the diameter-expanding direction due to the stretchability of the annular member 54, and is biased in the diameter-reducing direction in the diameter-expanded (expanded) state. Accordingly, the second attachment portion 65 is pressed against the attached member in the central axis direction in a state of being attached to the attached member. In other words, the second mounting portion 65 is in airtight (liquid tight) contact with the mounted member.

  Then, as in the first embodiment, the annular member 54 is, for example, vulcanized (injected) with the boot 61 using, for example, the tube T as a core, thereby forming the second member. It is included in a non-fixed state with respect to the attachment portion 65.

  Further, when assembling the boot 61, the insertion member is inserted into the boot 61 from the insertion opening 68 side, and the insertion member is protruded from the insertion opening 67, and the second mounting portion 65 is inserted into the annular member 54. At the same time, while applying an external force that pushes in the diameter-expanding direction, the second mounting portion 65 is released by releasing the external force in a state where the second mounting portion 65 is positioned around the mounted member inserted into the insertion opening 68. Is restored and deformed together with the annular member 54 to be reduced in diameter, and is fitted to the attached member. In this state, due to the stretchability of the annular member 54, the second mounting portion 65 is given a binding force that reduces the diameter in the central axis direction with respect to the mounted member.

  In this way, the second mounting portion 65 mounted on the mounted member side has at least radial stretchability and is integrally stretched with the second mounting portion 65 in the radial direction to mount the second mounting portion 65. By having a configuration similar to that of the first embodiment, such as including an annular member 54 that can be fastened and fixed to the member, the same effects as those of the first embodiment can be achieved.

  In the third embodiment, instead of the annular member 54, the annular member 56 of the second embodiment is used, and this annular member 56 is fixed to the mounting portion 65. There is an effect.

  Further, in each of the above embodiments, the seal member may not be cylindrical having openings at both ends as long as it has at least an insertion opening into which the attached member is inserted. Can be used. That is, for example, in the first embodiment or the second embodiment, the stud-side attachment portion 46 may include the annular member 54 or the annular member 56, and the attachment portions 46 and 47 each have an annular member. 54 or the annular member 56 may be included.

  Further, the annular members 54 and 56 may be wound three or more times, and may be formed in a spiral shape or an annular shape such as a C shape. Similarly, for example, the annular members 54 and 56 may be formed by annularly forming a long member wound in a coil spring shape.

11 Ball joint
16 Socket as mounted member
18 Ball stud
19 Dust cover as seal member
24 interior
25 First socket opening as communication opening
41 Ball
42 Stud section
45 Dust cover body as seal body
47 Socket side mounting section as mounting section
52 Second opening as insertion opening
54, 56 Ring member
61 Boots as seal members
63 Boot body as seal body
65 Second mounting part as mounting part
68 Insertion opening T Tube as covering member

Claims (8)

A seal body having an insertion opening into which at least a part of the attached member is inserted;
An attachment part that is integrally formed with the seal body part and attached to the attached member;
A sealing member comprising: an annular member included in the mounting portion and capable of extending and contracting integrally with the mounting portion and fastening and fixing the mounting portion to the mounted member. The socket of the ball joint comprising an inner chamber and a socket as a mounted member having a communication opening communicating with the inner chamber, and a ball stud that is slidably held in the inner chamber of the socket The seal member according to claim 1, wherein the seal member is a dust cover in which a mounting portion is attached and the ball stud is inserted into a seal main body portion and covers the communication opening. The seal member according to claim 1 or 2, wherein the annular member is included in a non-fixed state with respect to the attachment portion. The sealing member according to claim 3, further comprising: a covering member that covers the annular member in a non-fixed state and is enclosed in an attachment portion together with the annular member. The sealing member according to claim 1 or 2, wherein the annular member is contained in a fixed state with respect to the mounting portion. The seal member according to claim 5, wherein the annular member is made of a shape memory alloy. The sealing member according to any one of claims 3 to 6, wherein the annular member is formed by being wound at least twice. A socket as an attached member having an inner chamber and an opening communicating with the inner chamber;
A ball stud partially slidably held in the inner chamber of the socket;
A ball joint comprising: a seal member according to claim 1, wherein an attachment portion is attached to the socket and the ball stud is inserted into a seal member main body to cover the opening.

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