JP2020200893A - Ball joint dust cover - Google Patents

Abstract

To obtain a ball joint dust cover which hardly causes the come-off of a fastening member more than before by a simple constitution.SOLUTION: In a ball joint dust cover (14) which is attached to an external periphery of a socket of a ball joint (10) having a ball stud (11) in which a shaft part (112) is attached to a spherical head part (111), and a socket (12) having an opening part (121) inserted with the ball stud and an accommodation part (122) accommodated with the spherical head part, and fastened by a fastening member (band 15) from the external periphery, the ball joint comprises a small-diameter opening part (143) attached to the ball stud, and a large-diameter opening part (141) attached to the socket. An attachment face (band attachment face 140) of the fastening member with which the fastening member contacts is formed outside a recess which is formed at the external periphery of the socket, and the attachment face of the fastening member has an inclination face which is deepened toward a lower side in a cross section drawing.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dust cover for a ball joint.

Generally, a ball joint is widely used as a connecting member between a suspension and a steering link of an automobile or the like.
In the ball joint, the ball head of the ball stud mounted on the socket rotates within a predetermined angle range.
A dust cover is provided in order to prevent foreign matter such as muddy water or dust from entering the space where the ball head rotates.
The dust cover is attached to the socket by a reinforcing ring, a band, a circlip, or the like.
When a fastening member such as a band or circlip that is tightened from the outer circumference of the dust cover is attached, the fastening member adheres to the dust cover and tightens from the outer circumference of the dust cover, so that it is more reliable to prevent foreign matter from entering the dust cover. It is possible to hold the grease arranged in the space where the ball head rotates inside the dust cover.
However, if a fastening member that tightens the dust cover from the outer periphery is used, the dust cover and the fastening member may move depending on the shape of the socket that accommodates the fastening member, and the fastening member may come off the dust cover.

In Patent Document 1, which is an example of the prior art, a protrusion (82) for preventing the circlip from coming off is provided in a groove for accommodating a circlip, which is a fastening member to be tightened from the outer periphery of a large-diameter opening of a dust cover mounted on a socket. A dust cover for a ball joint, which can prevent the circlip from coming off by providing the dust cover, is disclosed.

Japanese Unexamined Patent Publication No. 2012-92858

As described above, when the dust cover is attached to the socket by using the fastening member that is tightened from the outer periphery of the dust cover, the fastening member may come off when the ball stud swings.

The present invention has been made in view of the above, and an object of the present invention is to obtain a dust cover for a ball joint, which has a simple structure and the fastening member is less likely to come off than before.

The present invention, which solves the above-mentioned problems and achieves the object, provides a ball stud having a shaft portion attached to the ball head, an opening into which the ball stud is inserted, and a storage portion in which the ball head is housed. A dust cover for a ball joint that is attached to the outer periphery of the socket of the ball joint including the socket and is fastened from the outer periphery by a fastening member, and is attached to the small-diameter opening attached to the ball stud and the socket. A large-diameter opening is provided, and the mounting surface of the fastening member in contact with the fastening member is formed on the outside of a recess provided on the outer periphery of the socket, and the mounting surface of the fastening member is formed. A dust cover for a ball joint having an inclined surface that becomes deeper toward the lower side in a cross-sectional view.

When the ball joint dust cover having the above configuration has the mounting surface formed on the outside of the concave portion sandwiched between the upper convex portion formed of a curved surface and the lower convex portion having a flat surface on the concave portion side. Good.

In the ball joint dust cover having the above configuration, the mounting surface is formed on the outside of the concave portion sandwiched between the upper convex portion formed of a curved surface and the inclined surface inclined so as to spread from the concave portion to the outer peripheral side. You may.

Alternatively, the present invention that solves the above-mentioned problems and achieves the object is a ball stud having a shaft portion attached to the ball head, an opening into which the ball stud is inserted, and a storage in which the ball head is housed. A dust cover for a ball joint that is attached to the outer periphery of the socket of a ball joint having a portion and is fastened from the outer circumference by a fastening member, and has a small diameter opening attached to the ball stud and the socket. The fastening member is provided with a large-diameter opening to be mounted on the socket, and the mounting surface of the fastening member to which the fastening member is in contact is formed on the outer side of the lower side of the convex portion provided on the outer periphery of the socket, and the fastening is performed. The mounting surface of the member is a ball joint dust cover having an inclined surface that becomes deeper toward the upper side in the cross-sectional view.

In the ball joint dust cover having the above configuration, the mounting surface is formed on the outside of the portion sandwiched by the convex portion having a flat surface on the lower side and the inclined surface inclined so that the lower side spreads toward the outer peripheral side. It is good.

According to the present invention, it is possible to obtain a ball joint dust cover in which the fastening member is harder to come off than before with a simple configuration.

It is sectional drawing which shows the ball joint which attached the dust cover for the ball joint which concerns on Embodiment 1. FIG. It is an enlarged sectional view in the vicinity of the recess shown in FIG. It is sectional drawing which shows the ball joint which attached the dust cover for the ball joint which concerns on Embodiment 2. It is an enlarged sectional view in the vicinity of the convex portion shown in FIG. FIG. 5 is an enlarged cross-sectional view of the vicinity of the convex portion in the socket of the modified example according to the second embodiment. It is an enlarged sectional view of the socket of a modification.

Embodiments of the present invention will be described below with reference to the drawings.
However, the present invention is not limited to the description of the following embodiments.

<Embodiment 1>
FIG. 1 is a cross-sectional view showing a ball joint 10 to which the ball joint dust cover 14 according to the present embodiment is mounted.
The ball joint 10 shown in FIG. 1 includes a ball stud 11, a socket 12, a ball joint dust cover 14, a band 15, and a knuckle 16.
A recess 13 is provided on the outer periphery of the socket 12 shown in FIG.

The ball stud 11 has a configuration in which a shaft portion 112 is attached to a ball head 111, and the ball head 111 rotates within a predetermined angle range.

The socket 12 has an opening 121 into which the ball stud 11 is inserted and a storage portion 122 in which the ball head 111 is housed.

The recess 13 is a portion for mounting the ball joint dust cover 14 provided on the outer periphery of the socket 12, and is formed by machining.

The ball joint dust cover 14 has a small-diameter opening 143 at one end that is attached to the shaft portion 112 of the ball stud 11 and seals, and a large other end that is attached to and seals at a recess 13 provided on the outer periphery of the socket 12. A diameter opening 141 and a film portion 142 located between the small diameter opening 143 and the large diameter opening 141 are provided.
The ball joint dust cover 14 prevents foreign matter from entering the storage portion 122.

The band 15 is a fastening member arranged at the position of the recess 13 and in contact with the ball joint dust cover 14 to tighten the ball joint dust cover 14 from the outer periphery thereof.
Here, as the fastening member, a circlip may be used instead of the band 15.
However, when the band or circlip tightens the ball joint dust cover 14 from the outer circumference thereof, the band or circlip may come off from the ball joint dust cover 14.

FIG. 2 is an enlarged cross-sectional view of the vicinity of the recess 13 shown in FIG.
The concave portion 13 shown in FIG. 2 is formed in a portion sandwiched between the upper convex portion 131 and the lower convex portion 133.

The lower convex portion 133 shown in FIG. 2 is substantially uniform because it serves as a stopper for preventing the ball joint dust cover 14 from coming off to the lower side by having a flat surface on the concave portion 13 side in contact with the ball joint dust cover 14. Even with a conventional dust cover for a ball joint having a large thickness, it is possible to prevent the band 15 from coming off downward.
However, as shown in FIG. 2, when the upper convex portion 131 is formed with a curved surface and does not have a flat surface on the concave portion 13 side in contact with the ball joint dust cover 14, a conventional ball having a substantially uniform thickness. When the joint dust cover is attached to the socket 12, the band 15 may come off upward when the ball stud 11 swings.
The upper convex portion 131 formed by such a curved surface can be formed by caulking.
Here, the plane is a flat surface, the curved surface is a surface having a shape opposite to the plane and having a curvature, and in the cross section, the plane is represented by a straight line and the curved surface is represented by a curve. ..

Therefore, in the present embodiment, as shown in FIG. 2, the band mounting surface 140 of the ball joint dust cover 14 has a shape having an inclined surface that becomes deeper from the upper side to the lower side.
When the band 15 is tightened to the band mounting surface 140 shown in FIG. 2, the upper portion of the band 15 comes into contact with the ball joint dust cover 14, the band 15 slides along the inclined surface, and the lower part of the band 15 The portion comes into contact with the lower surface of the band mounting surface 140, a force is generated by the ball joint dust cover 14 to press the band 15 downward, and the band 15 is pressed downward.
Therefore, the force for pressing the ball joint dust cover 14 downward becomes stronger on the lower side of the band 15, and the ball joint dust cover 14 is difficult to come off upward, so that the ball joint dust cover 14 comes off from the socket 12. Can be prevented.

According to the present embodiment described above, it is possible to obtain a dust cover for a ball joint in which the fastening member is harder to come off than before with a simple configuration.

<Embodiment 2>
In the first embodiment, the band mounting surface of the ball joint dust cover has an inclined surface that becomes deeper toward the lower side of the socket, but the present invention is not limited thereto.
In the present embodiment, a mode in which the band mounting surface of the ball joint dust cover has an inclined surface that becomes deeper toward the upper side of the socket will be described.

FIG. 3 is a cross-sectional view showing a ball joint 10a to which the ball joint dust cover 14a according to the present embodiment is mounted.
The ball joint 10a shown in FIG. 3 includes a socket 12a in place of the socket 12 in the ball joint 10 shown in FIG. 1, a dust cover 14a for a ball joint in place of the dust cover 14 for the ball joint, and other configurations are the same. Is.

The socket 12a is different from the socket 12 in that the concave portion 13 is not provided and the convex portion 131a is provided, and the other configurations are the same.
The convex portion 131a has a flat surface on the lower side.

The ball joint dust cover 14a includes a small-diameter opening 143a at one end that is attached to the shaft portion 112 of the ball stud 11 and seals, and a large-diameter opening 141a at the other end that is attached to the outer circumference of the socket 12a and seals. A film portion 142a located between the small-diameter opening 143a and the large-diameter opening 141a is provided.
The ball joint dust cover 14a prevents foreign matter from entering the storage portion 122.

FIG. 4 is an enlarged cross-sectional view of the vicinity of the convex portion 131a shown in FIG.
The convex portion 131a shown in FIG. 4 is provided on the outer periphery of the socket 12a and is formed by machining.

The convex portion 131a shown in FIG. 4 has a flat surface on the lower side in contact with the ball joint dust cover 14a, thereby serving as a stopper for preventing the ball joint dust cover 14a from coming off upward, and is a conventional stopper having a substantially uniform thickness. Even with a ball joint dust cover, it is possible to prevent the band 15 from coming off upward.
However, as shown in FIG. 4, since the socket 12a does not have a downward convex portion, when a conventional dust cover for a ball joint having a substantially uniform thickness is attached to the socket 12a, a band occurs when the ball stud 11 swings. 15 may come off to the lower side.
Here, the plane is a flat surface, the curved surface is a surface having a shape opposite to the plane and having a curvature, and in the cross section, the plane is represented by a straight line and the curved surface is represented by a curve. ..

Therefore, in the present embodiment, as shown in FIG. 4, the band mounting surface 140a of the ball joint dust cover 14a has a shape having an inclined surface that becomes deeper from the lower side to the upper side.
When the band 15 is tightened to the band mounting surface 140a shown in FIG. 4, the lower portion of the band 15 comes into contact with the ball joint dust cover 14a, the band 15 slides along the inclined surface, and the upper side of the band 15 The portion comes into contact with the upper surface of the band mounting surface 140a, a force is generated by the ball joint dust cover 14a to press the band 15 upward, and the band 15 is pressed upward.
Therefore, on the upper side of the band 15, the force for pressing the ball joint dust cover 14a upward becomes stronger, and the ball joint dust cover 14a does not easily come off downward, so that the ball joint dust cover 14a does not come off from the socket 12a. Can be prevented.

Note that FIG. 4 shows a shape in which the lower side of the portion where the ball joint dust cover 14a is arranged is a vertical surface as a socket having no lower convex portion, but the present invention is limited to this. It is not something that is done.
In the socket having no lower convex portion, the lower side of the portion where the ball joint dust cover 14a is arranged may be inclined.

FIG. 5 is an enlarged cross-sectional view of the vicinity of the convex portion 131a in the socket 12b of the modified example according to the present embodiment.
FIG. 5 is different from FIG. 4 only in that the socket 12b is shown instead of the socket 12a, and the other configurations are the same.
The socket 12b shown in FIG. 5 has an inclined surface 123 that is inclined so that the lower side of the portion where the ball joint dust cover 14a is arranged spreads toward the outer peripheral side, and the inclined surface 123 is the lower side of the ball joint dust cover. It serves as an auxiliary stopper to prevent the ball from coming off.
In the socket 12b shown in FIG. 5, the band mounting surface 140a is formed on the outside of the portion sandwiched between the convex portion 131a and the inclined surface 123, so that the ball joint dust cover 14a is further pulled out downward. It becomes difficult to prevent the ball joint dust cover 14a from coming off the socket 12b.

Also according to the present embodiment described above, it is possible to obtain a dust cover for a ball joint in which the fastening member is harder to come off than before with a simple configuration.

When applying the present invention, the ball joint dust cover 14 described in the first embodiment is attached to the socket having a shape that can be easily pulled out upward, and the socket having a shape that can be easily pulled out downward is the embodiment. The ball joint dust cover 14a described in 2 is attached.
For example, in a socket in which the upper convex portion 131 is formed of a curved surface as in the socket 12 shown in FIG. 1 of the first embodiment and has an inclined surface 123 as in the socket 12b shown in FIG. 5 of the second embodiment, the inclined surface 123 Is an auxiliary stopper that prevents the dust cover for the ball joint from coming off to the lower side, so it is hard to come off in the downward direction and easy to come out in the upward direction.
Therefore, the ball joint dust cover 14 shown in the first embodiment is attached to the socket having such a shape.

FIG. 6 is an enlarged cross-sectional view of the socket 12c of the modified example.
The socket 12c shown in FIG. 6 is inclined so that the upper convex portion 131 formed of a curved surface like the socket 12 and the lower side of the portion where the ball joint dust cover is arranged like the socket 12b spread to the outer peripheral side. A concave portion 13a is formed in a portion having an inclined surface 123 and sandwiched between the upper convex portion 131 and the inclined surface 123.
In the socket 12c shown in FIG. 6, although the inclined surface 123 suppresses the dust cover for the ball joint from coming off to the lower side, the upper convex portion 131 is formed of a curved surface, so that the dust cover for the ball joint is on the upper side. Easy to pull out.
Therefore, it is possible to prevent the fastening member from coming off by attaching the ball joint dust cover 14 to the socket 12c shown in FIG. 6 to prevent it from coming off in the upward direction.

In the above-described first and second embodiments, it is assumed that the large-diameter openings 141 and 141a are not provided with a reinforcing ring for mounting the fastening member, but the small-diameter openings 143 and 143a are provided. A reinforcing ring may be provided.

The ball joint according to the present invention described above can be used, for example, as a connecting member between a suspension and a steering link of an automobile or the like, but is not limited thereto.

10, 10a Ball joint 11 Ball stud 111 Ball head 112 Shaft 12, 12a, 12b, 12c Socket 121 Opening 122 Storage 123 Inclined surface 13, 13a Concave 131 Upper convex 131a Convex 133 Lower convex 14, 14a Dust cover for ball joint 140, 140a Band mounting surface 141, 141a Large diameter opening 142, 142a Membrane 143, 143a Small diameter opening 15 Band 16 Knuckle

Claims (5)

Attached to the outer circumference of the socket of a ball joint comprising a ball stud having a shaft portion attached to the ball head, an opening into which the ball stud is inserted, and a socket having a storage portion in which the ball head is housed. A dust cover for a ball joint that is tightened from the outer circumference by a fastening member.
A small-diameter opening attached to the ball stud and
A large-diameter opening to be attached to the socket is provided.
The mounting surface of the fastening member with which the fastening member contacts is formed on the outside of a recess provided on the outer periphery of the socket.
The mounting surface of the fastening member is a dust cover for a ball joint having an inclined surface that becomes deeper toward the lower side in the cross-sectional view. The dust cover for a ball joint according to claim 1, wherein the mounting surface is formed on the outside of the concave portion sandwiched between the upper convex portion formed of a curved surface and the lower convex portion having a flat surface on the concave portion side. .. The ball joint according to claim 1, wherein the mounting surface is formed on the outside of the concave portion sandwiched between the upper convex portion formed of a curved surface and the inclined surface inclined so as to spread from the concave portion to the outer peripheral side. Dust cover. Attached to the outer circumference of the socket of a ball joint comprising a ball stud having a shaft portion attached to the ball head, an opening into which the ball stud is inserted, and a socket having a storage portion in which the ball head is housed. A dust cover for a ball joint that is tightened from the outer circumference by a fastening member.
A small-diameter opening attached to the ball stud and
A large-diameter opening to be attached to the socket is provided.
The mounting surface of the fastening member with which the fastening member is in contact is formed on the outer side of the lower side of the convex portion provided on the outer circumference of the socket.
The mounting surface of the fastening member is a ball joint dust cover having an inclined surface that becomes deeper toward the upper side in the cross-sectional view. The ball joint dust according to claim 4, wherein the mounting surface is formed on the outside of the portion sandwiched between the convex portion having a flat surface on the lower side and the inclined surface inclined so that the lower side spreads toward the outer peripheral side. cover.

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