JPS611431A - Manufacture of ball joint - Google Patents

Abstract

PURPOSE:To manufacture a ball joint of a high strength socket body with less man-hours and high efficiency by forming plural slit in pierced different diameter holes of both faces of a crashed plate-shaped part of one end of tube member, flanging up each of them to the outside, and caulking the spherical part of the spherical body. CONSTITUTION:When manufacturing a part of a ball joint of a tie rod 4 and a knuckle arm 9, one end of a tube member becomes a socket part 1 is pressed to a plate shape 2 having a correct gap, and different diameter holes 19, 20 are pierced on both faces. Plural slits 23 are formed in the holes 19, 20, and each of them is flanged up 12 to the outside by pressing in a different diameter punch and expanding the diameter. A resin sheet 13 coated spherical body part 6 of a spherical body 5 is inserted, and the flange-up part 12 is caulked and clamped. A trouble such as a conventional hole matching, welding, etc. is saved, the production efficiency is improved, and the whole strength is raised as one body with an inserting socket part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of manufacturing a ball joint used for a connection part of a steering linkage of a vehicle, etc.

(Prior Art) As a conventional ball joint, for example, one shown in FIG. 12 is known.

This conventional ball joint B' has a plate member 12
A socket body 122 is formed using 0.0, 121, and this socket body 122 is formed by a joining process in which two plate members 120 and 121, in which holes of different diameters are pre-drilled, are joined by welding (welding part 123). It was formed by

In addition, 124 in the figure is a sphere, and its spherical part 125 is the flange part 126, 127 of the plate members 120, 121.
The spherical side mounting member 129 is attached to the mounting portion 128.
is fixed by oak) 130.

Further, reference numeral 131 denotes a socket-side mounting member, which is fixed to the plate members 120, 121 with fixing tools such as bolts and nuts.

(Problems to be Solved by the Invention) However, in such conventional ball joints, the socket body 122 was manufactured by joining two plate members 120 and 121 by welding. However, there were problems as listed below.

(2) It is necessary to weld the two plate members 120 and 121 while aligning them, which requires a lot of work.

(2) If the welding conditions are poor, such as when foreign matter is attached to the joint between the plate members 120 and 121, a joint failure will occur, and the strength of the socket body 122 will be poor in uniformity.

(2) The socket body 122 and the socket-side mounting member 131 must be fixed with bolts and nuts, and this is difficult if the socket-side mounting member 131 is a cylindrical member.

(Means for Solving the Problems) That is, the present invention was developed with the aim of solving the above-mentioned problems.One aspect of the present invention is to crush at least a portion of a tube member that becomes a socket body into a flat plate shape. The pressing process, the drilling process in which holes of different diameters are drilled on both sides of the press flat plate part, the flange-up process in which the outer peripheries of the holes are raised outward from each other, and the spherical part of the sphere in the flange-up hole. The manufacturing method includes a caulking step of arranging a flange portion and caulking a flange portion to the spherical portion.

(for production) Therefore, when manufacturing the socket body.

By simply crushing the tube member, opposing pressed flat plate portions can be formed without welding or the like.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In describing this embodiment, a ball joint used to connect a tie rod and a knuckle arm in a steering device of an automobile will be taken as an example.

First, with reference to FIG. 1 and FIG. 2, the structure of Borge Mushroom Inn) B manufactured by the manufacturing method of the example will be explained.

Reference numeral 1 denotes a socket body, which is composed of a pressed flat plate part 2 and a tube attachment part 3. A tie rod 4 as a tube side attachment member is fixed to the tube attachment part 3 by press fitting.

Reference numeral 5 denotes a sphere, which is composed of a spherical part 6, a mounting part 7, and a threaded part 8. A knuckle arm 9, which serves as a spherical-side mounting member, is fixed to the mounting part 7 by a nut 10 that is screwed into the threaded part 8. be done.

Reference numeral 11 denotes a pole connecting portion, which is a portion that connects the socket body l and the sphere 5;
The spherical surface portion 6 of the other spherical body 5 is connected and supported.

Note that a resin sheath 13 is provided on the outer periphery of the spherical portion 6 to improve sliding.

Furthermore, a slit 14 is formed in the flange portion 12 to improve moldability.

Next, a method for manufacturing the pole shimindo B will be explained with reference to FIGS. 3 to 11.

First, the pressing process is a process of crushing a part of the tube member that will become the socket body l into a flat plate shape, and as shown in FIG. The tube member 17 is pressed by the press body 16.
This is a process carried out by crushing a part of the

The portion of the tube member 17 that is crushed becomes the pressed flat plate portion 2, and the portion that is not crushed becomes the tube attachment portion 3.

Further, the press flat plate part 2 includes upper and lower press flat plate parts 2,
2 are not crushed to the extent that they are in contact with each other, but are crushed to a state where they face each other with a predetermined distance t between them. This is to prevent cracks from forming in the press side portions 18, 18, which undergo large press deformations, and to ensure connection strength between the press plate portions 2, 2.

The next hole drilling step is to drill holes 19 and 20 of different diameters on both sides of the press flat plate parts 2, 2, as shown in FIG. Small diameter hole 19
Then, as shown in FIG. 5, a large diameter hole 20 is made in the other press flat plate part 2.

Incidentally, as the hole-drilling means, drills 21, 22, a hole punch, etc. are used for the hole-drilling.

Further, either the small diameter hole 19 or the large diameter hole 20 may be opened first.

The next slitting step is a step of forming slits 23 of a predetermined depth radially outward from the inside of the holes 19, 20, as shown in FIG.
This is a process in which a plurality of slits 23 are formed on the outer periphery of the flange 12, so that the flange portions 12 and 12 can be easily formed during the primary flange up process.

The next flange-up process is a process in which the outer peripheral parts of the holes 19 and 20 are raised outward from each other, and this flange-up process, which is performed using a burring machine or the like, involves the flange-up of the small-diameter hole 19 side and ( (Fig. 7), enlargement of the flange diameter (Fig. 8), and flange up on the large diameter hole 20 side (Fig. 9).

When raising the flange on the small-diameter hole 19 side, push the flange-up member 26, which has a slightly smaller diameter than the large-diameter hole 20, from the large-diameter hole 20 side. In this case, a flange up member 27 having a diameter slightly smaller than the enlarged flange diameter is pushed in from the seven rung portion 24 side.

In this flange-up process, a flange portion 12.12 that rises outwardly is formed on the press flat plate portion 2°2.

The next caulking process is a process in which the spherical part 6 of the sphere 5 is placed in the hole 28 in the flange-up state (Fig. 1θ), and the flange part 12.12 is caulked to the spherical part 6 (Fig. 11). In the embodiment, a resin sheet 13 is provided around the outer periphery of the spherical portion 6, and caulked together with the resin sheet 29.

Note that the flange portion 12.12 is caulked at the upper and lower positions of the spherical portion 6, and this caulking allows the socket body l and the sphere 5 to rotate around the axis of the sphere 5. They are also connected to allow some degree of rocking.

Although the method for manufacturing the ball joint according to the embodiment has been described in detail above, the specific method is not limited to this example, and the method may be changed or added without changing the gist of the present invention. Included in the present invention.

For example, although a part of the tube member is crushed in the embodiment, the entire tube member may be crushed and fixed to the socket-side mounting member by screws.

(Effects of the Invention) As described above, according to the present invention, since the socket body can be manufactured by simply crushing the tube member, there is no need for joining such as welding, which simplifies the work effort and time. The effect is that it can be done as follows.

In addition, since the pressed flat plate part that connects with one sphere is integrally formed by using the tube member as a material, it is possible to create a socket body with high strength. By keeping the pressing force constant, a socket body with uniform strength can be obtained.

Furthermore, in addition to the above-mentioned effects, in the embodiment, by crushing a part of the tube member, it can be press-fitted and fixed to the cylindrical socket-side member, and by forming a slit, it is possible to facilitate the flange-up process. This is easy, and by interposing the resin socket, the friction coefficient of the connecting friction part can be lowered.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a ball joint manufactured by the manufacturing method of the example, Fig. 2 is a sectional view showing the ball joint of the example, Fig. 3 is a sectional view showing the pressing process, Figs. Figure 5 is a sectional view showing the hole drilling process, Figure 6 is a perspective view showing the socket body with slits made in the slitting process, Figures 7, 8, and 9 are sectional views showing the flange up process. FIGS. 10 and 11 are cross-sectional views showing the caulking process, and FIG. 12 is a cross-sectional view showing a ball joint manufactured by a conventional manufacturing method. l... Socket body 2... Press flat plate part 5... Sphere 6... Spherical part 12... Flange part 17... Tube member 19.20... Hole patent application Nissan Motor Co., Ltd. Co., Ltd.Figure 4Figure 5Figure 6Figure 7Figure 9

Claims (1)

[Claims] 1) A pressing step in which at least a portion of the tube member that will become the socket body is crushed into a flat plate, a drilling step in which holes of different diameters are drilled on both sides of the pressed flat plate, and the outer peripheries of the holes are erected outward from each other. A method for producing a ball joint, comprising: a flange-up process for raising the flange; and a crimping process for placing a spherical part of a sphere in a hole in the flange-up state and caulking the flange part to the spherical part.