JPH0538469U - Ball joint joint dust cover mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] A small diameter of the dust cover 5 having a large diameter fitting portion 51 fitted to the socket 3 and a small diameter fitting portion 52 fitted to the tapered shaft portion 1b of the ball stud 1. The sealing surface with which the fitting portion 52 is elastically contacted is a surface that has a reliable sealing property and is easily slidable without precision machining. [Structure] A dust cover 5 in which a taper tube 8 which is a press-formed product is fitted to the taper shaft portion 1b, and which is fitted to the taper shaft portion 1b.
The upper surface of the small-diameter fitting portion 52 of FIG.
By adopting a structure in which the link member 6 is elastically contacted with and sealed, the precision machining of the bottom surface of the link member 6 which is conventionally required can be omitted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ball joint dust cover mounting structure.

[0002]

[Prior Art]

 A ball joint generally consists of a ball stud, a ball seat made of synthetic resin that fits and holds the spherical portion of the ball stud, and a socket into which the ball seat is fitted. A dust cover made of elastic material such as rubber is attached between the stud and the outer circumference of the shaft to prevent dust such as water or dust from entering the sliding contact surface between the ball seat and the ball stud spherical portion from the outside. It is common to seal it.

For example, as shown in FIG. 4, the dust cover A has a large-diameter fitting portion A 1 and a ball which are fitted to a dust cover mounting portion B ′ provided on the outer periphery near the opening edge of the socket B. The stud C has a small diameter fitting portion A2 fitted to the shaft portion (tapered shaft portion) C'at both ends, and the link member D is fitted and fixed to the shaft portion C'to reduce the diameter as shown by the chain line. The inner peripheral surface and the upper surface of the fitting portion A2 are elastically attached to the outer peripheral surface of the shaft portion C'and the bottom surface of the link member D to be assembled.

[0004]

[Problems to be solved by the device]

 The ball stud performs a swinging motion with respect to the socket and a rotating motion around the axis of the ball stud. During the swinging motion of the ball stud, the dust cover A causes the bellows portion A3 to swing. During the rotational movement, the inner peripheral surface and the upper surface of the small diameter fitting portion A2 of the dust cover A slides relative to the outer peripheral surface of the shaft portion C'and the bottom surface of the link member D during the rotational movement. The cover A must not be twisted. Therefore, the elastic contact portions between the inner peripheral surface and the upper surface of the small-diameter fitting portion A2 and the shaft portion C'and the bottom surface of the link member D must be not only sealing surfaces but also surfaces suitable for sliding surfaces. , The outer peripheral surface of the shaft portion C'and the bottom surface of the link member D must be machined with a fairly high precision so that the small-diameter fitting portion A2 is slippery, which increases the man-hour and cost. Has the problem.

The present invention mainly aims to address the above-mentioned conventional problems.

[0006]

[Means for Solving the Problems]

 According to the present invention, a taper shaft portion of a ball stud is fitted with a taper pipe having a flange portion at a lower end portion or a dust cover fitting piece having a flange portion at one of upper and lower ends of a tubular portion. It is characterized in that at least the flange portion of the pipe or the dust cover fitting piece is used as a sealing surface on which the upper surface or the lower surface of the small diameter fitting portion of the dust cover is elastically contacted.

[0007]

[Action]

 In the above description, since the taper pipe or the dust cover fitting piece is formed by press molding, the flange portion which becomes the sealing surface is sufficiently smooth and does not need to be machined. It is also easy to make the sealing surface slippery, for example, by coating it with a synthetic resin material, eliminating the need to carefully machine the bottom surface of the link member as in the past, reducing the processing man-hours and the accompanying cost reduction. Can be measured.

[0008]

【Example】

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

FIG. 1 shows a first embodiment of the present invention, in which 1 is a ball stud, 2 is a synthetic resin ball seat that fits and holds the spherical portion 1a of the ball stud 1, and 3 is a ball seat. The ball seat 2 is a socket into which the ball seat 2 is press-fitted, and the ball seat 2 in which the spherical portion 1a is fitted and held is press-fitted into the socket 3 from the lower opening of the socket 3, and the end plate is fitted into the lower opening of the socket 3. 4 is fixed by caulking and assembled.

Reference numeral 5 denotes a dust cover made of an elastic material such as rubber, and the dust cover 5 is a large diameter fitting portion fitted to a dust cover mounting portion 3b provided on the outer periphery of the swing opening 3a of the socket 3. 51 and a small diameter fitting portion 52 fitted on the outer periphery of the shaft portion of the ball stud 1 at both ends, a press fitting ring 51a is embedded in the large diameter fitting portion 51, and a reinforcing ring is provided in the small diameter fitting portion 52. 52a is buried, and the structure of the dust cover 5 is the same as the conventional one.

Reference numeral 6 denotes a link member. The link member 6 has a taper hole 6a in which the taper shaft portion 1b of the ball stud 1 is fitted, and a nut 7 is screwed into a screw portion 1c at the tip of the taper shaft portion 1b and tightened. Although connected to the ball stud 1, in FIG. 1, a taper pipe 8 is interposed between the taper shaft portion 1b and the taper hole 6a, and a flange portion 8a provided at a large-diameter end portion of the taper pipe 8 is provided. Then, the upper surface of the small diameter fitting portion 52 fitted to the taper shaft portion 1b makes elastic contact, and the inner peripheral surface of the small diameter fitting portion 52 and the upper surface of the small diameter fitting portion 52 make elastic contact with the taper shaft portion 1b. The structure is such that the elastic contact portion of the taper pipe 8 with the flange portion 8b serves as a sealing surface and a sliding surface at the same time.

Since the taper tube 8 is formed by press molding, the bottom surface of the flange portion 8a, which serves as the sealing surface and the sliding surface, is sufficiently smooth and does not need to be machined. It is not necessary to carefully machine the bottom surface of No. 6 as in the conventional case, and it is possible to reduce the number of processing steps and the cost accordingly.

FIG. 2 shows a second embodiment of the present invention. In this example, the inner peripheral surface of the small diameter fitting portion 52 of the dust cover 5 is attached to the lower outer peripheral surface of the taper tube 8 and the upper surface of the flange portion 8a. The lower surface and the lower surface elastically contact each other, and the elastic contact surface serves as the main sealing surface and the sliding surface, and the upper surface of the small-diameter fitting portion 52 elastically contacts the bottom surface of the link member 6 so that sealing is performed here as well. The other structure is the same as that of the first embodiment shown in FIG.

In the second embodiment, it is necessary to machine the bottom surface of the link member 6 with a certain degree of precision so as to have the sealing property and the slidability, but the main sealing surface and the sliding surface are required. The lower outer peripheral surface of the taper pipe 8 and the upper surface of the flange portion 8a, which are the press-molded product of the taper pipe 8 as described above, do not need to be machined, and are similar to those of the first embodiment. It is possible to reduce the processing man-hours and costs compared with the conventional ones.

In the embodiment shown in FIGS. 1 and 2, it is easy to make the sliding surface slippery by coating the portion of the taper tube 8 that becomes the sealing surface and the sliding surface with, for example, a synthetic resin material. By this, the sliding resistance of the small-diameter fitting portion 52 is further reduced.

1 and 2, the ball stud 1 has a structure in which a tapered tube 8 is interposed between the tapered shaft portion 1b of the ball stud 1 and the tapered hole 6a of the link member 6. The diameter of the taper shaft portion 1b of No. 1 can be reduced by the thickness of the taper tube 8, and the diameter of the spherical portion 1a, the ball seat 2, the socket 3, etc. can be reduced as the diameter of the taper shaft portion 1b is reduced. This makes it possible to achieve the side effect of making the ball joint smaller and lighter.

3 (A) and 3 (B) show the third and fourth embodiments of the present invention. In this example, instead of the tapered tube 8 of FIGS. A dust cover fitting piece 81 having a shape in which a flange portion 81b is provided at an upper end portion or a lower end portion of 81a is used, and the cylindrical portion 81a is fitted to the outer periphery of the lower portion of the taper shaft portion 1b of the ball stud 1, and the dust cover By fitting the small-diameter fitting portion 52 of the dust cover 5 into the tubular portion 81a of the fitting piece 81, the inner diameter of the small-diameter fitting portion 52 is fitted to the tubular portion 81a and the flange portion 81b of the dust cover fitting piece 81. The peripheral surface and the upper surface or the lower surface are in elastic contact with each other, and the cylindrical portion 81a and the flange portion 81b are the sealing surface and the sliding surface. The configuration other than the above is the same as that of FIG. 1 and FIG. Is.

In the third and fourth embodiments, since the dust cover fitting piece 81 is a press-molded product like the taper pipe 8 of the first and second embodiments, there is no need for machining. In addition, it is possible to secure sufficient sealing and slidability, and FIG. 3 (A) is similar to the embodiment of FIG. 1, and FIG. 3 (B) is similar to the embodiment of FIG. ， Effective.

In FIGS. 3A and 3B, since the dust cover fitting piece 81 is a relatively small piece, its surface is coated with, for example, a synthetic resin material to make it more slippery. It has the effect of being easier and more cost effective.

[0020]

[Effect of the device]

 As described above, according to the present invention, a taper pipe or a dust cover fitting piece, which is a press-molded product, is fitted to the taper pipe of the ball stud, and the taper pipe or the dust cover fitting piece or the taper pipe is covered with a dust cover. The small-diameter fitting part is fitted, and at least one of the upper and lower surfaces of the small-diameter fitting part is slidably elastically contacted with at least the flange part of the taper pipe or the dust cover fitting piece. The number of man-hours required for precision machining of the surface of the dust cover small-diameter fitting part that elastically contacts is at least halved, and the man-hours and manufacturing costs of the ball joint and its related parts can be significantly reduced. In addition, it is possible to obtain a ball joint with excellent functions, such as improving the sealing performance and slidability of the seal part by the small-diameter fitting part, and preventing twisting of the dust cover accompanying it, which is practical. It is those that can lead to large effects.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a half cross-sectional view of essential parts showing a second embodiment of the present invention.

FIG. 3A is a longitudinal sectional view of an essential part showing a third embodiment of the present invention, and FIG. 3B is a half sectional view of an essential part showing a fourth embodiment of the present invention.

FIG. 4 is a sectional view of an essential part showing a conventional structure example.

[Explanation of symbols]

 1 Ball Stud 1a Spherical Part 1b Tapered Shaft Part 2 Ball Seat 3 Socket 5 Dust Cover 6 Link Member 6a Tapered Hole 8 Tapered Tube 8a Flange Part 51 Large Diameter Fitting Part 52 Small Diameter Fitting Part 81 Dust Cover Fitting Piece 81a Cylindrical Part 82a Flange part

Claims (3)

[Scope of utility model registration request] 1. A ball joint comprising a ball stud, a ball seat fitted and embracing a spherical portion of the ball stud, and a socket into which the ball seat is fitted, the dust being made of an elastic material such as rubber. In the one in which the large diameter fitting portion of the cover is fitted in the socket and the small diameter fitting portion of the dust cover is fitted in the ball stud and sealed so that dust does not enter from the outside, in the outer circumference of the tapered shaft portion of the ball stud, A taper pipe having a flange portion is fitted to the lower end portion, and the upper surface of the small-diameter fitting portion of the dust cover fitted to the outer circumference of the taper shaft portion of the ball stud makes elastic contact with the lower surface of the flange portion of the taper pipe. It is characterized in that a sealing surface is constituted by a taper shaft outer peripheral surface where the inner peripheral surface of the small-diameter fitting portion of the dust cover elastically contacts and a flange lower surface of the taper tube where the upper surface of the small-diameter fitting portion elastically contacts. Ball joint dust cover mounting structure. 2. The dust cover mounting structure for a ball joint according to claim 1, wherein a small diameter fitting portion of the dust cover is fitted and inserted into a lower portion of the taper tube fitted to the outer circumference of the tapered shaft portion of the ball stud. A dust cover for a ball joint, characterized in that a sealing surface is constituted by an outer peripheral surface of the tapered tube with which the inner peripheral surface of the fitting portion elastically contacts and a flange flange upper surface with which the lower surface of the small diameter fitting portion elastically contacts. Mounting structure. 3. Instead of the taper pipe according to claim 1 or 2,
Use a dust cover fitting piece consisting of a cylinder part fitted around the lower part of the taper shaft part of the ball stud and a flange part provided at the upper or lower end of the cylinder part, and dust the small diameter fitting part of the dust cover with dust. Dust cover fitted on the outer circumference of the cylindrical portion of the cover fitting piece, and the inner peripheral surface of the small-diameter fitting portion elastically contacts the outer peripheral surface of the cylindrical portion of the fitting piece and the upper or lower surface of the small-diameter fitting portion. A dust cover mounting structure for a ball joint, characterized in that a sealing surface is constituted by a flange portion of a fitting piece.