JP3778718B2 - Dust cover - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a dust cover for a joint member used in, for example, a suspension device and a steering device for an automobile.
[0002]
[Prior art]
Conventionally, dust covers have been used for various things to prevent water and foreign matter from entering. For example, some joint members used in automobile suspensions and the like are provided with a dust cover. The joint member shown in FIG. 5 is a ball joint 151, and a ball stud 152 including a spherical ball head 154 and a handle 153 extending from the ball head 154, and a bearing including the ball head 154 of the ball stud 152. 155 and a bearing 155, a small opening 158 for projecting the handle 153 of the ball stud 152 on one side, and a large opening 159 for caulking and fixing the closing plate 161 on the other side, on the outer peripheral surface near the small opening 158 A housing 157 in which a circumferential groove 160 is formed, a small opening 105 in which a reinforcing ring 107 is embedded, on the outer periphery of the handle 153 of the ball stud 152, and a large opening 106 in which a circumferential circlip 108 is fitted are housings. The dust cover 101 is attached to the groove 160 of 157. The dust cover 101 is made of an elastic member and has a substantially bell shape.
[0003]
[Problems to be solved by the invention]
On the inner peripheral surface of the small opening 105 of the dust cover 101 attached to the ball joint 151, as shown in FIG. 6, a tapered portion 103 having a large diameter in the axial direction, and an end portion of the tapered portion 103 A lip portion 104 is formed in which a taper portion 102 having a small diameter with respect to the axis is continuous, and the penetration of water and foreign matter is suppressed by the lip portion 104. However, since the tapered portions 102 and 103 of the lip portion 104 are inclined with respect to the axis, the small opening 105 of the dust cover 101 is guided by the inclined tapered portions 102 and 103 so that water and foreign matters are ball joints. There is a possibility of entering inside.
[0004]
Accordingly, an object of the present invention is to solve the above-described problems and provide a dust cover that can more strongly suppress the intrusion of water and foreign matter.
[0005]
[Means for Solving the Problems]
The configuration of the present invention is as follows.
[0006]
In the dust cover with openings at both ends, the outer peripheral lip and the inner peripheral lip set lower in the axial direction than the outer peripheral lip are formed on the inner peripheral side of the outer peripheral lip on the axial end surface of the small opening formed on one side. The lip portion on the inner periphery of the opening has a serrated cross section, and the lip portion is composed of a horizontal portion that is substantially perpendicular to the axis and a taper portion that has a large diameter in the opening direction from the horizontal portion to the opposite side of the axis. The dust cover is characterized in that the horizontal portions have a uniform horizontal height .
Is formed.
[0007]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
[0008]
FIG. 1 shows a ball joint 51 equipped with a dust cover 1 according to an embodiment of the present invention. The ball joint 51 includes a ball stud 52 composed of a spherical ball head 54, a handle 53 protruding from the ball head 54, and a ball head 52 of the ball stud 52 so as to be swingable. On the other hand, a synthetic resin bearing 55 having an opening 56 on one side and a substantially cylindrical housing 57 containing the bearing 55 are provided. The housing 57 has a small opening 58 for projecting the handle 53 of the ball stud 52 on one side, and a large opening 59 on the other side to which a closing plate 61 is fixed by caulking. A groove 60 is formed. 1 is a dust cover made of an elastic member, and a small opening 5 in which a reinforcing ring 7 having an L-shaped cross section is embedded is attached to the outer periphery of the handle 53 of the ball stud 52 and a large opening 6 having a circlip 8 attached to the outer periphery. Is mounted in a groove 60 on the outer periphery of the housing 57.
[0009]
A lip portion 4 is formed on the inner periphery of the small opening 5 of the dust cover 1 as shown in FIG. The lip portion 4 is formed by a continuous horizontal portion 2 perpendicular to the axis and a tapered portion 3 having a gradually increasing diameter from the horizontal portion 2 in the direction of the small axis opening. Further, an outer peripheral lip 11 and an inner peripheral lip 12 which is set lower in the axial direction than the outer peripheral lip 11 are formed on the end surface on the small opening 5 side of the dust cover 1. It is in contact with an equal connecting member (not shown).
[0010]
As shown in FIG. 3, when water or a foreign object enters the ball joint 51 through a path as indicated by an arrow A, the knuckle arm or other connecting member (not shown) is connected between the outer peripheral lip 11 and the inner peripheral lip 12. Intrusion is blocked. However, when wear occurs on the outer peripheral lip 11 and the inner peripheral lip 12, the ball stud 52 swings and a gap is temporarily generated between the connecting member and the outer peripheral lip 11 and the inner peripheral lip 12, so that water and foreign matter are collected. invade. In such a case, since the lip portion 4 has the horizontal portion 2 perpendicular to the axis, water and foreign matter are guided to the lip portion 4 and will not enter further.
[0011]
【The invention's effect】
As described above, according to the present invention, in the dust cover having openings at both ends, the axial end surface of the small opening formed on one side is set lower on the inner peripheral side than the outer peripheral lip and the outer peripheral lip and lower in the axial direction than the outer peripheral lip. The inner lip of the small opening has a serrated cross section, and the lip has a horizontal portion that is substantially perpendicular to the axis and a horizontal portion that is large in the opening direction opposite to the axis. The taper portion that is the diameter is continuous, and the horizontal portions of the horizontal portions are uniformly formed in the horizontal direction, so that when the outer lip and the inner lip wear, the connecting member, the outer lip and the inner lip Since there is a temporary gap between the peripheral lip and water or foreign matter intrusions, the intrusion of water or foreign matter is not blocked by the horizontal part of the lip and guided to the inside. Compared to the dust cover, water and foreign matter It can be more strongly suppressed from entering into the Sutokaba.
[Brief description of the drawings]
FIG. 1 is a partial sectional plan view showing a ball joint equipped with a dust cover according to an embodiment of the present invention.
FIG. 2 is a cross-sectional plan view illustrating a dust cover according to an embodiment of the present invention.
FIG. 3 is an enlarged view showing a main part of a dust cover according to an embodiment of the present invention.
FIG. 4 is a cross-sectional plan view illustrating a dust cover according to another embodiment of the present invention.
FIG. 5 is a cross-sectional plan view showing a conventional dust cover.

Claims (1)

In the dust cover having openings at both ends, the axial end face of the small opening formed on one side is lower in the axial direction than the outer peripheral lip (11) on the inner peripheral side of the outer peripheral lip (11) and the outer peripheral lip (11). A set inner peripheral lip (12) is formed, and the inner peripheral lip (4) of the small opening (5 ) has a serrated cross section, and the lip (4) is substantially perpendicular to the axis. The horizontal portion (2) and the tapered portion (3) having a large diameter in the opening direction opposite to the axial line from the horizontal portion (2) are continuous, and the plurality of horizontal portions (2) have a horizontal height. A dust cover characterized in that is uniformly formed .

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