JPH0517963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a spherical sliding joint device, and in particular, the present invention relates to a spherical sliding joint device that connects an inner fitting to a spherical sliding joint device that can be suitably used for pillow ball bushings, ball jointed rods, etc. in vehicle suspensions. The present invention relates to a spherical sliding joint device in which an outer member movably held is formed of a synthetic resin material.

(Background Art) Conventionally, as a type of joint device used in vehicle suspensions, etc., a fitting portion having a spherical outer circumferential surface provided on an inner metal fitting is housed and held in a socket of an outer member, and such a fitting device is used. A so-called spherical sliding joint device is known in which the inner fitting is connected to the outer member in a spherical sliding manner by allowing spherical sliding to occur at the joint. For example, in members such as arms, links, and rods (hereinafter collectively referred to as rods) that constitute the suspension of an automobile, the above-mentioned A structure in which a spherical sliding mechanism like this is provided at one end or both ends is used.

Conventionally, such a spherical sliding joint device has a structure in which the outer member is made of a metal material, as shown in Japanese Utility Model Application No. 55-84312. However, in recent years, in order to reduce the weight of vehicles and improve corrosion resistance, it has been considered to convert rods containing such outer members to ones made of resin. , JP-A No. 62-35109, JP-A No. 63-13912, etc. have disclosed techniques that can advantageously realize a resin rod equipped with such a spherical sliding mechanism.

By the way, since the sliding performance of such a spherical sliding joint device is easily inhibited by dust, mud, etc. entering the sliding surface, an annular or cylindrical dust cover is usually provided. , attached to the inner member at the inner peripheral edge and to the outer member at the outer peripheral edge, respectively, so as to close the opening of the socket in the outer member and seal the sliding surface from the external space. becomes.

However, in the case of conventional metal dust covers, the dust cover can be attached to the outer member by crimping with a snap spring, or by press-fitting a metal ring hot-glued to the dust cover into the attachment hole of the outer member. Therefore, it is possible to do it relatively easily, but as mentioned above,
If the outer member is made of synthetic resin, the dimensions of the molded product are likely to vary due to shrinkage of the resin during molding, and due to the characteristics of the resin, the strength is low and creep is likely to occur. With such mounting methods, it is difficult to stably obtain sufficient holding force (fixing force), and the holding force tends to decrease over time, making it difficult to obtain the desired sealing performance and holding force. They had problems that were said to be difficult to overcome.

In addition, when installing such a dust cover, it is possible to use adhesives that are normally used for joining resin products, but using adhesives requires a lot of man-hours to apply and is not suitable for mass production. In addition, it is difficult to obtain a stable adhesive strength, making it difficult to obtain satisfactory sealing properties and holding power.

(Problem to be solved) Here, the present invention has been made against the background of the above-mentioned circumstances, and the problem to be solved is that the outer member that holds the inner metal fitting in a spherical slidable manner is made of a synthetic resin material. This is a spherical sliding joint device formed by a spherical sliding joint device, which is equipped with a sealing mechanism that enables sealing of the spherical sliding portion from the external space advantageously and at low cost without deterioration in manufacturability. An object of the present invention is to provide a spherical sliding type joint device.

(Solution Means) In order to solve this problem, in the present invention, a fitting portion having a spherical outer circumferential surface provided on an inner fitting is inserted into a socket of an outer member formed of a synthetic resin material. In a spherical sliding type joint device that accommodates and holds the inner fitting and the outer member, and allows the inner fitting to slide relative to the outer member on a spherical surface at the fitting portion. , an annular or cylindrical dust cover is disposed between the inner metal fitting and the outer member so as to cover the sliding boundary portion thereof, and the inner peripheral edge of the dust cover is connected to the outer circumference of the inner metal fitting. At the same time, a tapered inner wall surface that expands outward is continuously provided in the circumferential direction around the socket opening in the outer member, so that the outer peripheral edge of the dust cover is An annular synthetic resin fixing member having a tapered outer circumferential surface corresponding to the inner wall surface is placed inside the inner wall surface facing each other at a predetermined distance while its inward movement is restricted. The fixing member is fitted between the dust cover and the inner wall surface, and the tapered outer peripheral surface of the fixing member is joined and integrated with the tapered inner wall surface of the outer member by welding. The outer peripheral edge of the dust cover is fixed around the socket opening of the outer member.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows a longitudinal sectional view of a specific example of a spherical sliding joint device constructed according to the present invention. In this figure, 10 is a rod as an outer member formed of a predetermined synthetic resin material, and at one end in the longitudinal direction, a socket hole 14 whose central inner peripheral surface is a spherical concave surface 12 is provided. The rod 10 is provided through the rod 10 in the thickness direction, while at the other end in the longitudinal direction, one opening of the through hole provided in the thickness direction of the rod 10 is closed with a support 13. As a result, the socket hole 18 whose inner peripheral surface has a spherical concave surface 16 is formed.
is provided.

A cylindrical pillow ball fitting 22 having an inner hole 20 into which a member to be connected to the rod 10 is inserted and fixed is inserted into the socket hole 14 of the rod 10. Further, this pillow ball fitting 22 has a ball portion 24 having a spherical outer circumferential surface approximately corresponding to the spherical concave surface 12 of the socket hole 14 in the axially central portion, and this ball portion 24 has a ball portion 24 that has a spherical outer peripheral surface substantially corresponding to the spherical concave surface 12 of the socket hole 14. It is accommodated and located in the spherical concave surface 12 portion within the spherical concave surface 14 .

Furthermore, a substantially cylindrical elastic sliding member 26 is interposed between the spherical concave surface 12 in the socket hole 14 of these rods 10 and the ball portion 24 of the pillow ball fitting 22 accommodated therein. As a result, the pillow ball fitting 22 is connected to the rod 10 via the elastic sliding member 26 in a spherically slidable manner.

On the other hand, in the socket hole 18 of the rod 10, a ball fitting 30, which is integrally connected to a member to be connected to the rod 10 at its base 28, is inserted and arranged at its distal end. It is being The tip of the ball fitting 30 accommodated in the socket hole 18 of the rod 10 is a ball portion 32 having a spherical outer circumferential surface substantially corresponding to the spherical concave surface 16 of the socket hole 18.

Furthermore, a substantially cylindrical elastic sliding member 34 is interposed between the spherical concave surface 16 in the socket hole 18 of these rods 10 and the ball portion 32 of the ball fitting 30 accommodated therein. Thereby, the ball fitting 30 is connected to the rod 10 via the elastic sliding member 34 so as to be able to slide spherically.

That is, in the spherical sliding joint device of this embodiment, the pillow ball fittings 22 and ball fittings 30, which are inner members, are connected to both ends of the rod 10, which is an outer member, so as to be able to slide spherically. It is equipped with a spherical sliding joint device.

Incidentally, such a joint device is manufactured according to the manufacturing method as disclosed in, for example, the above-mentioned Japanese Patent Laid-Open Publication No. 13912/1983.

That is, when manufacturing such a joint device,
First, the elastic sliding bodies 26 and 34 are fitted into the pillow ball fittings 22 and the ball fittings 30 that have been formed in advance, and the elastic sliding bodies 26 and 34 are exteriorized. The rod 10 is set in a predetermined mold, and then a predetermined resin material is injected into the injection mold.
By molding, the intended joint device is formed. Note that the setting of the ball fitting 30 into the mold is as follows.
0 is supported by a separately formed support 13.

Then, by injection molding of such resin material,
As the fluidized injection resin solidifies, the elastic sliding bodies 26 and 34 are joined to the resin of the rod 10, and the support body 13 is integrally embedded within the rod 10 to improve the shape effect and the resin. Integration can be achieved by contraction of the . Also, due to the injection pressure of the injected resin, the elastic sliding contact body 2
A squeezing effect is applied to the holes 6 and 34 to further ensure their connection, and thereby the socket holes of the ball portions 24 and 32 of the pillow ball fittings 22 and ball fittings 30 are tightened. 14 and socket hole 18 can be done simultaneously with such injection molding.

In this case, the resin material forming the rod 10 is usually various thermoplastic resins such as nylon, polypropylene, acetal, etc., or various thermoplastic resins such as nylon, polypropylene, acetal, etc., depending on the usage conditions of the joint device that is the product. Therefore, resins containing reinforcing materials whose strength has been improved by adding glass fibers, carbon fibers, whiskers, etc. are preferably used.

Furthermore, as the material for forming the elastic sliding bodies 26 and 34, NR, SBR, NBR, EPDM, urethane rubber, etc. will be selected and adopted according to the usage conditions (load, sliding torque), etc. However, in particular, it is desirable to have a material with excellent sliding performance in order to ensure sufficient sliding performance on the pillow ball fittings 22 and ball fittings 30. For this purpose, if necessary, fluororesin fibers are coated on the inner peripheral surface. A sliding cloth etc. woven using low-friction fibers such as the following will be provided.

Furthermore, although it is possible to adopt a resin material, a metal material, etc. as the material for forming the support body 13, the recessed portion 36 constitutes a sliding surface for the ball portion 32 of the ball fitting 30. Therefore, sliding resins such as nylon, polyacetal resin, fluorine resin, or oil-impregnated resins are preferably used.

By the way, in the spherical sliding joint device having such a structure, there is a gap between the ball portions 24 and 32 of the pillow ball fittings 22 and the ball fittings 30 and the elastic sliding bodies 26 and 34 or the support body 13. The sliding performance is likely to be impaired by foreign matter such as dust or muddy water entering between the sliding surfaces formed in the sliding surfaces. Therefore,
In such a spherical sliding joint device, in order to seal between the sliding surfaces from the outside, the pillow ball fittings 22 are arranged in the axial direction so as to cover each sliding boundary portion 38 where the sliding surfaces are exposed to the outside. Both ends and the base 28 side portion of the ball fitting 30, and the rod 10
A dust cover 40 made of a rubber elastic material is disposed between the openings of the socket hole 14 and the socket hole 18, respectively.

As shown in FIG. 2, the dust cover 40 has a substantially annular plate shape with a curved slack portion 42 at its radial center. The inner circumferential edge is slightly thickened and forms a fitting part 46 having two seal lips 44, 44 continuously extending in the circumferential direction on the inner circumferential surface, while the outer circumferential edge The mounting portion 50 extends radially outward and includes an annular clamping piece 48 extending axially at an end edge thereof.

Further, as shown in FIGS. 1 and 3, the pillow ball fitting 22 and the ball fitting 30
A fitting groove 52 is provided on the outer circumferential surface of the portion of the rod 10 that protrudes outward from the socket hole 14 or 18, respectively, and extends over the entire circumference. 5
2, the fitting portion 4 of the dust cover 40
6 is fitted, the dust cover 4
0 is extrapolated onto the pillow ball fitting 22 (ball fitting 30), and the pillow ball fitting 22
It is fixed in a crimped state to the outer peripheral surface of the (ball metal fitting 30). In addition, such fitting groove 5
2 is formed with a substantially trapezoidal cross section opening on the outer peripheral surface, and a dust cover 4 is fitted therein.
The sealing performance between the fitting surface and the fitting part 46 of No. 0 is improved.

On the other hand, around the openings of the socket holes 14 and 18 in the rod 10, there are grooves 54 extending all around the circumferential direction at positions spaced apart from the openings by a predetermined distance in the radial direction. is formed. In the case of such a groove 54, the third
As shown, radially inner wall 56
is lowered by a predetermined dimension than the radially outer wall 58, and the inner wall surface 6 of the radially outer wall 58 is lower than the radially outer wall 58 by a predetermined dimension.
0 is formed with a tapered surface that widens outward.

The dust cover 40 has its mounting portion 50 positioned on the inner wall portion 56 of the groove 54, and the clamping piece 48 of the dust cover 40 is positioned on the inner wall portion 56 of the groove 54.
It will be placed in a state where it is inside 4.
In particular, the clamping piece 48 of the dust cover 40
By being disposed in the groove 54, the inner wall portion 56 of the groove 54 restricts its movement inward in the radial direction, and the outer wall portion 5 of the groove 54 is regulated.
8 (inner wall surface 60), and is positioned opposite to 8 (inner wall surface 60) with a predetermined distance in the radial direction.

Furthermore, the mounting portion 5 of the dust cover 40
In the concave groove 54 in which the clamping piece 48 of the dust cover 40 is disposed, a fixing ring 62 having a generally annular shape as shown in FIG. It will be fitted between the opposing surfaces.

Here, the fixing ring 62 has a tapered outer peripheral surface 64 corresponding to the taper formed on the inner wall surface 60 of the groove 54, and has a generally wedge-shaped cross section with a thickness varying in the axial direction. It is formed by The fixing ring 62 is made of a suitable thermoplastic resin, and as shown in FIG. Clamping piece 4 of dust cover 40
8, the tapered outer circumferential surface 64 and the inner wall surface 60 of the groove 54 are joined by known friction welding such as ultrasonic welding, as shown in FIG. As shown, they are joined and integrated while being press-fitted into the groove 54. That is, the fixing ring 62 is inserted into the groove 54.
The fixing ring 62 and the groove 54 (rod 10 ) by applying pressure to one or both of them using an ultrasonic transmitter and an ultrasonic vibrator (horn) 66 while applying ultrasonic vibration to give relative motion.
Ultrasonic welding of the fixing ring 62 into the groove 54 is performed by press-fitting the fixing ring 62 into the groove 54 and generating frictional heat in the contact area to heat and melt the ring 62. It is.

Further, in this case, the taper diameter of the outer peripheral surface 64 of the fixing ring 62 is made larger than the taper diameter of the inner wall surface 60 of the groove 54 when set in the groove 54. During ultrasonic welding as described above, the fixing ring 62
By being press-fitted further inward, the outer peripheral surface 6
4 and the inner wall surface 60 of the concave groove 54 is advantageously ensured, thereby making it possible to obtain good bonding force. In addition, such a fixing ring 6
In the case of 2, when press-fitting during welding, softening due to frictional heat generated and the contact of the outer circumferential surface 64 with the inner wall surface 60 causes radially inward deformation. The gripping piece 48 of the dust cover 40 is pressed against the outer peripheral surface of the holding piece 48, and the holding piece 48 is held between the inner wall portion 56 of the groove 54 and the holding piece 48.

Furthermore, this fixing ring 62 has an integral annular cover portion 74 extending radially outward in an outer lounge shape at the axial end portion of the side exposed to the outside, and as described above. When press-fitting and welding the fixing ring 62 into the groove 54,
By abutting the annular cover portion 74 against the outer wall portion 58 of the concave groove 54 in the rod 10, the press-fit end thereof can be defined, thereby improving the welding state and welding strength of the fixing ring 62. It has now become possible to advantageously stabilize the

The amount of penetration of the fixing ring 62 defined by the annular cover portion 74 into the groove 54 during welding, that is, the value of _t1 in FIG. 5, is generally set to about 0.2 to 0.7 mm. It will be done. In addition to obtaining the effect of the annular cover portion 74, the gap (t ₂ in FIG. 5) between the tip surface of the fixing ring 62 and the bottom surface of the groove 54 is generally the same as t ₁ above. or larger. However, in this embodiment, t ₁ ≒ t ₂ and the fixing ring 62 is fixed in the groove 54 not only on its outer peripheral surface 64 but also on its bottom surface, and furthermore, the annular shape The surface of the cover portion 74 facing the outer wall portion 58 is also welded to the opening portion of the groove 54 (the end surface of the outer wall portion 58), so that the welded area can be advantageously secured. .

Furthermore, regarding such a fixing ring 62,
At the axial end portion of the side exposed to the outside, an annular locking piece 68 is provided that extends radially inward in the shape of an inner lounge. By welding the fixing ring 62 into the concave groove 54 as described above, the annular locking piece 68 is formed as shown in FIG.
By being pressed against the mounting portion 50 of the dust cover 40 in the axial direction, the clamping piece 48 of the mounting portion 50 can be prevented from coming out of the groove 54.

In particular, in this embodiment, as shown in FIGS. 5 and 6, the dust cover 40 of the annular locking piece 68 of the fixing ring 62 is
An engagement groove 70 extending in the circumferential direction is provided on the pressure contact surface of the dust cover 40, while an annular engagement protrusion 72 that is engaged with the engagement groove 70 is provided on the pressure contact surface of the mounting portion 50 of the dust cover 40. is provided, and the concave groove 5 of the fixing ring 62 as described above is provided.
By press-fitting into the dust cover 4 and welding the engagement protrusion 72 into the engagement groove 70, the dust cover 40 can be more firmly locked. be.

Therefore, in the spherical sliding joint device having the above-described structure, the outer peripheral edge of the dust cover 40 fits inside the groove 54 provided around the socket holes 14 and 18 in the rod 10. , since it is mounted under pressure between the inner wall portion 56 and the fixing ring 62 and between the bottom surface of the groove 54 and the annular locking piece 68 of the fixing ring 62. Sufficient sealing performance can also be achieved at the attachment site of the dust cover 40, and as a result, the intrusion of dust and muddy water into the spherical sliding site can be extremely effectively prevented.

Further, the fixing ring 62 that holds the outer peripheral edge of the dust cover 40 is attached to the concave groove 54 of the rod 10.
The outer peripheral edge of the dust cover 40 is radially sandwiched between the fixing ring 62 and the inner surface of the groove 54, and the axial Since it is attached while being locked in the direction, a high holding force can be effectively exerted.

Incidentally, when the present inventor measured the holding force (extracting force) at the attachment part of the dust cover 40 attached to the rod 10, the holding force of the structure of this embodiment was stable at 151 to 178 kg. Obtained by doing. On the other hand, similar holding force measurements were conducted on a conventional structure, and it was found that a metal ring was vulcanized and bonded to the outer peripheral edge of the dust cover 40, and the metal ring was press-fitted into the rod 10. In this case, the holding force is 3.8 to 7.2 kg, and after vulcanizing and adhering a metal ring to the outer peripheral edge of the dust cover 40 and press-fitting the metal ring into the rod 10, the rod is heated. For items fixed by caulking, the holding force is 10.8 ~
30.0Kg, and in the case where the outer peripheral edge of the dust cover 40 is fixed using adhesive in the groove provided in the rod 10, the holding force is 16 to 30Kg, and none of them. However, it was not possible to obtain sufficient holding power.

That is, from this measurement result as well, it is clear that the dust cover of the joint device of this example has superiority in sealing function and attachment holding force.

In addition, in the case of a spherical sliding joint device having such a structure, the fixing ring 62 is fixed to the rod 10 by fusion bonding, so that the necessary holding force such as press-fitting of a metal ring is required. (Press fit allowance)
Unlike methods that ensure dimensional accuracy through dimensional accuracy, dimensional variations due to manufacturing errors can be advantageously absorbed, and therefore sufficient holding force can be stably obtained and its reliability can be advantageously achieved. It has the advantage of being able to ensure

Furthermore, in such a spherical sliding joint device, there is no need to vulcanize and bond a metal ring or the like to the dust cover 40, and there is no need for a manual adhesive application process, so the manufacturing process In addition, by employing the ultrasonic welding method as illustrated, the dust cover 40 can be attached instantly by welding the fixing ring 62 by a machine. Because it can be used for various purposes, it has the advantage of being excellent in mass production.

Although one embodiment of the present invention has been described in detail above, this is a literal illustration, and the present invention includes the following:
It is not intended to be interpreted as being limited to such specific examples.

For example, the structure for attaching the inner peripheral edge of the dust cover 40 to the pillow ball fittings 22 or 30 is not limited to the structure described above, and can be attached by extrapolation, so that its sealing properties can be improved. Since it is relatively easy to secure the mounting surface and the surface to be mounted is metal, it can be fixed or slidably mounted by conventionally known methods such as fitting with a snap spring or press-fitting method using a metal ring. It is also possible to do so.

Further, in the embodiment, the dust cover 4
The movement of the outer peripheral edge of the dust cover 40 inward in the radial direction was restricted by the inner wall 56 of the groove 54. It is also possible to arrange or adhere a hard ring or the like on the inside in the radial direction, and use the ring to restrict movement.

Furthermore, in the embodiment, the fixing ring 6
2, the dust cover 40 is fixed in the axial direction by pressure contact with the annular locking piece 68 of the fixing ring 62.
The tip of the clamping piece 48 of 0 is bent radially outward,
By pressing the bent portion with the press-fit side tip surface of the fixing ring 62 or by bending the tip surface of the dust cover 40 inward in the radial direction, the locking groove into which the bent portion is fitted is inserted into the concave groove 54. It is also possible to fix it in the axial direction by providing it on the inner peripheral surface of.

Further, in the embodiment described above, the amount of penetration of the fixing ring 62 into the groove 54 during welding can be determined by the contact of the annular cover portion 74 with the end surface of the outer wall portion 58. It is also possible to define the amount of penetration of the fixing ring 62 into the groove 54 by abutting the tip end surface of the fixing ring 62 against the bottom surface of the groove 54. In such a case, the annular cover part 74 is not necessarily required, and when the annular cover part 74 is provided, it should be set so that t ₂ ≦t ₁ in FIG. Become.

Furthermore, the rod 10 of such a fixing ring 62
As the welding method for the welding, various known welding methods such as heat welding, high frequency welding, etc. can be appropriately employed in addition to the exemplified ultrasonic welding.

In addition, it is desirable that the rod 10 and the fixing ring 62 that are welded to each other be made of thermoplastic resin in order to obtain high welding strength.
Depending on the material, strength, etc. required for the product, the present invention can be effectively applied as long as one of them is a thermoplastic resin.

In addition, the present invention is of course applicable to various types of spherical sliding joint devices in addition to the above-mentioned rod member equipped with spherical sliding mechanisms at both ends in the axial direction. The present invention can also be effectively applied to a joint device including an outer member in which only the portion constituting the socket hole is made of a resin material.

Although not listed in detail, the present invention may be implemented in various modifications, modifications, improvements, etc. based on the knowledge of those skilled in the art, and such embodiments may be implemented without departing from the spirit of the present invention. It goes without saying that all of these are included within the scope of the present invention as long as they do not deviate from the above.

(Effects of the Invention) As is clear from the above description, according to the present invention, in the spherical sliding joint device, the spherical sliding joint device is arranged between the inner fitting and the outer member to prevent dust and muddy water from contacting the sliding surfaces thereof. The dust cover, which prevents the intrusion of foreign substances such as dust covers, is fixed to the outer member by pinching or locking with a fixing member that is melt-bonded to the outer member.
Even when such an outer member is made of synthetic resin, sufficient attachment and holding force can be exerted, and excellent sealing performance can be obtained.

In addition, in such a joint device, since the fixed member is joined to the outer member by welding, a strong joint force is stably exerted, and in particular, dimensional variations due to manufacturing errors etc. It can be absorbed advantageously, its excellent sealing properties can be stably exhibited with high reliability, and mass production can be advantageously realized at low cost through mechanization.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a spherical sliding joint device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a dust cover that constitutes the spherical sliding joint device taken out. be. Moreover, FIG. 3 is an enlarged sectional view of the main part for explaining the state in which the dust cover is attached to the rod, and FIG.
FIG. 5 is a cross-sectional view showing a fixing ring for fixing the dust cover to the rod, and FIG. 5 is an enlarged cross-sectional view of essential parts for explaining the operation of attaching the fixing ring to the rod. Furthermore,
FIG. 6 is an explanatory cross-sectional view showing an enlarged main part of the spherical sliding joint device shown in FIG. 1. FIG. 10... Rod (outer member), 12... Spherical concave surface, 14... Socket hole, 16... Spherical concave surface,
18...Socket hole, 22...Pillow ball fitting,
24...ball part, 30...ball metal fitting, 32...
...Ball part, 38...Sliding boundary part, 40...Dust cover, 46...Fitting part, 50...Mounting part,
54...Concave groove, 56...Inner wall portion, 58...Outer wall portion, 60...Inner wall surface, 62...Fixing ring, 6
6... Ultrasonic vibrator, 68... Annular locking piece.

Claims (1)

[Claims] 1. A fitting portion having a spherical outer circumferential surface provided on an inner fitting is housed and held in a socket of an outer member formed of a synthetic resin material, and the inner fitting and outer member are connected together. In the spherical sliding joint device, the inner fitting and the outer member are connected to each other, and the fitting portion allows the inner fitting to slide relative to the outer member on a spherical surface. An annular or cylindrical dust cover is arranged so as to cover the sliding boundary portion thereof, and the inner peripheral edge of the dust cover is attached to the outer peripheral surface of the inner metal fitting, while the socket opening in the outer member A tapered inner wall surface that expands outward is provided continuously in the circumferential direction around the dust cover, so that the outer peripheral edge of the dust cover is restricted from moving inward in the radial direction. An annular synthetic resin fixing member is positioned opposite to the inner wall surface at a predetermined distance and has a tapered outer peripheral surface corresponding to the inner wall surface, and is fitted between the dust cover and the inner wall surface. , by joining and integrating the tapered outer circumferential surface of the fixing member with the tapered inner wall surface of the outer member by welding, the outer circumferential edge of the dust cover is connected to the outer member by the fixing member. A spherical sliding type joint device, characterized in that it is fixed around a socket opening of a socket.