JPH10159988A - Dust cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust cover on which adhesive strength of a small opening part is not reduced and which is excellent in durability by embedding a reinforcing member composed of an elastic member which is filled between a reinforcing ring and auxiliary members and whose elastic modulus is lower than the dust cover. SOLUTION: In a dust cover 11, an inner peripheral installing part 15 of a small opening part 12 is installed on an outer periphery of a handle part 3 of a stud 2, and in a large opening part 13, a fastening ring 16 is installed on an outer periphery, and is installed in a dust cover installing groove 8 formed on an outer periphery of a housing 5. A reinforcing member 14 is embedded in the small opening part 12 of the dust cover 11. A reinforcing member 14 is composed of a metallic cross-sectional L-shaped reinforcing ring 14a, plural auxiliary members 14c arranged at intervals on the inner peripheral side of the reinforcing ring 14a and an elastic member 14b which is filled between the reinforcing ring 14a and the auxiliary members 14c and whose elastic modulus is lower than the dust cover 11. Therefore, resiliency of the elastic member 14b strongly acts, and high sealing performance can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust cover for a joint member used for, for example, a suspension system or a steering system of an automobile.

[0002]

2. Description of the Related Art As a joint member used for a suspension device or a steering device of an automobile, there is a joint member having a dust cover 111 as shown in FIG. The joint member is a ball joint 101, a stud 102 having a spherical ball head 104, a handle 103 projecting from the ball head 104, and a ball head 1 of the stud 102.
A bearing 109 made of a synthetic resin and enclosing the bearing 04 in a swingable manner is provided, and a housing 105 made of metal and disposed substantially on the outer periphery of the bearing 109 is provided. The housing 105 has the handle portion 103 of the stud 102 protruding from one end opening 106, and a closing plate 117 is caulked and fixed to the other end opening 107.
A dust cover mounting groove 108 is formed on the outer periphery on the sixth side. Reference numeral 111 denotes a substantially cylindrical dust cover made of an elastic material. The inner peripheral mounting portion 115 of the small opening 112 is mounted on the outer periphery of the handle portion 103 of the stud 102, and the large opening 113 is mounted on the outer periphery of the fastening ring 116. It is mounted in a dust cover mounting groove 108 formed on the outer periphery of the housing 105. Then, as shown in FIG.
The reinforcing ring 1 made of metal and having an L-shaped cross section is
14a is buried. Also, this dust cover 11
The upper lip 117, 11
8 are formed.

[0003]

Since the upper lips 117 and 118 of the ball joint 101 on which the dust cover 111 is mounted are in close contact with the end face 121 of the connecting rod 120, water, dust and the like are exposed to water from the outside. Prevents intrusion into the joint. However, due to the swing of the stud 102 of the ball joint 101, a gap may be generated between the upper lip 117, 118 of the dust cover 111 on the anti-oscillation side and the end face 121 of the connecting rod 120. Even in such a case, the dust cover 11
Since the inner peripheral mounting portion 115 is in close contact with the handle portion 103 of the stud 102, the sealing performance is ensured, and the intrusion of water, dust, and the like can be prevented. However, if such a ball joint 101 is used for a long period of time, the upper lips 117 and 118 of the dust cover 111 will be worn, and the dust cover 111 will be reduced toward the connecting rod 120 due to the repulsive force in the axial direction. The opening 112 moves.
Also, the inner peripheral mounting portion 115 of the dust cover 111 is similarly worn due to the swing of the stud 102, so that the sealing property is reduced and the small opening 112 of the dust cover 111 is reduced.
There may be a gap between the stud 102 and the handle 103 of the stud 102. Then, the upper lip 1 of the dust cover 111 on the anti-oscillation side due to the oscillation of the stud 102
When a gap is generated between the end faces 17 and 118 and the end face of the connecting rod 120 and water or dust or the like enters over the upper lip 117 or 118, the inner peripheral mounting portion 115 of the dust cover 111 also causes water or dust or the like. The intrusion cannot be prevented, and the intrusion into the ball joint 101 occurs.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the problems described above and to provide a dust cover having excellent durability without reducing the adhesive force of the small opening for long-term use.

[0005]

The configuration of the present invention is as follows.

In a substantially cylindrical dust cover in which both ends are opened, one small opening is attached to the outer periphery of the handle of the stud, and the other large opening is attached to the outer periphery of the housing, the small opening is made of metal. A reinforcing ring having an L-shaped cross section, a plurality of auxiliary members arranged at intervals on the inner peripheral side of the reinforcing ring, and a space between the reinforcing ring and the auxiliary member, wherein the elastic coefficient is lower than that of the dust cover. A reinforcing member made of an elastic member is embedded.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a ball joint 1 equipped with a dust cover 11 according to an embodiment of the present invention. The ball joint 1 is composed of a stud 2 having a spherical ball head 4, a handle 3 projecting from the ball head 4, and a ball head 4 of the stud 2 swingably and rotatably held. The bearing includes a resin-made substantially cup-shaped bearing 9 and a metal-made substantially cylindrical housing 5 disposed on the outer periphery of the bearing 9. The housing 5 has the handle portion 3 of the stud 2 protruding from one end opening 6, a closing plate 17 is fixed by caulking to the other end opening 7, and a dust cover mounting groove 8 is formed on the outer periphery of the one end opening 6 side. I have. Reference numeral 11 denotes a substantially cylindrical dust cover made of an elastic material. The inner peripheral mounting portion 15 of the small opening 12 is mounted on the outer periphery of the handle portion 3 of the stud 2, and the large opening 13 is mounted with a tightening ring 16 on the outer periphery. It is mounted in a dust cover mounting groove 8 formed on the outer periphery of the housing 5. The reinforcing member 14 is provided in the small opening 12 of the dust cover 11.
Is buried. 2 and 3.
As shown in the figure, a reinforcing ring 14a made of metal and having an L-shaped cross section
A plurality of auxiliary members 14c arranged at intervals on the inner peripheral side of the reinforcing ring 14a; the reinforcing ring 14a and the auxiliary member 14c
And an elastic member 14b having a lower elastic coefficient than the dust cover. An upper lip 1 is provided on the end surface of the dust cover 11 on the side of the small opening 12.
7, 18 are formed.

The ball joint 1 has a small opening 1 of a dust cover 11 formed in a handle 3 of a stud 2.
2 Smaller opening 1 of dust cover 11 than outer diameter of mounting part
Since the inner diameter of the second member 2 is smaller, the small opening 12 of the dust cover 11 is pressed into the handle 3 of the stud 2 to generate a repulsive force due to the interference.

In such a ball joint 1, since the upper lips 17, 18 are in close contact with the connecting rod 20, water or dust from the outside is prevented from entering the inside of the ball joint. However, due to the swing of the stud 2 of the ball joint 1, a gap may be generated between the upper lips 17, 18 of the dust cover 11 on the anti-oscillation side and the end face 21 of the connecting rod 20. Even in such a case,
Since the inner peripheral mounting portion 15 of the dust cover 11 is in close contact with the handle portion 3 of the stud 2, the sealing property is ensured, and water and dust can be prevented from entering. However, if such a ball joint 1 is used for a long period of time, the upper lips 17, 18 of the dust cover 11 will be worn, so that the dust cover 11 is reduced toward the connecting rod 20 by the repulsive force in the axial direction. The opening 12 moves. Similarly, the inner peripheral mounting portion 15 of the dust cover 11 is worn due to the swing of the stud 2, but the reinforcing member 14 embedded in the small opening 12 of the dust cover 11 is made of metal and has a cross section L.
A reinforcement ring 14a, a plurality of auxiliary members 14c arranged at intervals on the inner peripheral side of the reinforcement ring 14a, and a reinforcement ring 14a.
a, the elastic member 14b of the reinforcing member 14 has a lower elastic modulus than the dust cover 11 because the elastic member 14b is filled between the auxiliary member 14a and the auxiliary member 14c and has a lower elastic modulus than the dust cover. Elastic member 14
Since the repulsive force of b works strongly, high sealing performance can be maintained.

[0011]

As described above, according to the present invention, a substantially cylindrical shape having both ends open, a small opening at the end of the handle portion of the stud, and a large opening at the other end is mounted on the outer periphery of the housing. In the dust cover, the small opening has a reinforcing ring made of metal and having an L-shaped cross section, a plurality of auxiliary members arranged at intervals on the inner peripheral side of the reinforcing ring, and a gap between the reinforcing ring and the auxiliary member. And the reinforcing member made of an elastic member having a lower elastic coefficient than the dust cover is embedded, so that the elastic member of the reinforcing member has a lower elastic coefficient than the dust cover, so that the repulsive force of the elastic member is reduced. Works strongly, so that a high sealing property can be maintained and the durability of the dust cover can be increased.

[Brief description of the drawings]

FIG. 1 is a partial sectional plan view of a ball joint provided with a dust cover according to an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view showing a small opening before a connecting rod is pressed into a ball joint to which a dust cover according to an embodiment of the present invention is attached.

FIG. 3 is a top view of a reinforcing member of the dust cover according to the embodiment of the present invention.

FIG. 4 is a partial cross-sectional plan view of a ball joint provided with a conventional dust cover.

FIG. 5 is a sectional plan view showing a small opening in a state before a connecting rod is press-fitted into a ball joint equipped with a conventional dust cover.

[Explanation of symbols]

 2 stud 3 handle 5 housing 11 dust cover 12 small opening 13 large opening 14 reinforcing member 14a reinforcing ring 14b elastic member 14c auxiliary member

Claims (1)

[Claims] An opening is formed at both ends, a small opening (12) at one end is provided on the outer periphery of a handle (3) of a stud (2), and a large opening (1) at the other end.
3) in the substantially cylindrical dust cover (11) mounted on the outer periphery of the housing (5), respectively, in the small opening (1).
2) a metal-made reinforcing ring (14a) having an L-shaped cross section;
A plurality of auxiliary members (14c) arranged at an interval on an inner peripheral side of the reinforcing ring (14a); and a dust cover filled between the reinforcing ring (14a) and the auxiliary member (14c). The elastic member (14) having a lower elastic modulus than (11)
(b) a dust cover, wherein the reinforcing member (14) is embedded.