JPH06280851A - Spheric sliding type joint device - Google Patents

Abstract

PURPOSE:To reduce the number of parts, machining man-hours and assemblirng man- hours and moreover to reduce manufacturing cost by forming a recess or a projection on a cylindrical body and an outer barrel to prevent an axial relative slippage, and arranging an axial tangent passing the innermost periphery of the outer barrel radially more outside than an axial tangent passing the outermost periphery of an inner barrel. CONSTITUTION:On the inner periphery of a cylindrical body 3 provided outside an inner barrel 1 having a spherical convex face 2 on the outer periphery of an axially intermediate part, the spherical covex face 2 is held so as to be spherically slidable. The inner periphery of the cylindrical body 3 is provided with a spherical recess 4, which is in sliding contact with the spherical convex face. An outer barrel 5 unitedly formed without division is provided outside the cylindrical body 3. A recess 6 is formed at two spots on the outer barrel 5 from the outside to the inside, and the spot corresponding to the recess 6 of the cylindrical body 3 is formed into a recess 7. In addition, a tangent axially extending in contact with the radially innermost periphery of the outer barrel 5 exists radially more outside as far as a space (t) than a tangent which passes the radially outermost periphery of the sperical convex face 2 of the inner barrel 1 and extends axially.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical sliding type joint device suitable for use in a spherical sliding type bush or a rod with a ball joint used in a vehicle suspension of an automobile or the like.

[0002]

2. Description of the Related Art As a conventional device of this type, Japanese Patent Publication No.
The one described in JP-A-30727 is known. As shown in FIG. 23, this has an inner cylinder 100 made of a polymer material having a spherical convex surface 101 on an outer peripheral surface of an intermediate portion in the axial direction, and a cylindrical body 102 is provided outside the inner cylinder 100 to form a spherical shape. The convex surface 101 is held on the inner peripheral surface (spherical concave surface 103) of the cylindrical body 102 so as to be slidable on a spherical surface. On the outer side of the cylindrical body 102, first and second outer cylinders 104 and 105 divided into two are provided.

As another conventional example, Japanese Patent Publication No. 3072/1990
Those disclosed in Japanese Patent Publication No. 8 and Japanese Patent Publication No. 3-31928 are also known.

[0004]

In all of the conventional devices, the outer cylinder is composed of a plurality of parts, which naturally increases the number of parts,
In addition, the number of processing steps is increased to process these parts, and the number of assembly steps is also increased, resulting in high cost.

Therefore, an object of the present invention is to provide a spherical sliding joint device in which the number of parts, the number of working steps and the number of assembling steps are reduced to reduce the cost.

[0006]

In order to achieve the above object, the present invention is directed to an inner circumference of a cylindrical body made of a polymer material, which is provided outside an inner cylinder having a spherical convex surface on an outer peripheral surface of an intermediate portion in the axial direction. In a spherical sliding joint device in which this spherical convex surface is held in a spherically slidable manner on the surface, an outer cylinder integrally formed without dividing the outer surface of the cylindrical body is provided, and a concave portion or a convex portion is formed on the outer cylinder. At the same time, a concave portion or a convex portion corresponding to these is formed on the cylindrical body to prevent relative displacement between the cylindrical body and the outer cylinder along the axial direction, and from the tangent line in the axial direction passing through the outermost peripheral surface of the inner cylinder. Also, the tangent line in the axial direction passing through the innermost peripheral surface of the outer cylinder is located outside in the radial direction.

[0007]

According to the present invention, the outer cylinder can be constituted by a general pipe-shaped metal fitting, and after the metal fitting is dented or processed to form a cylindrical body made of a polymer material, the both are formed. It can be easily integrated. By using such an outer cylinder, the number of parts, the number of processing steps, and the number of assembly steps can be reduced, and the manufacturing can be facilitated, and the cost can be significantly reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIGS. 1 and 2, the spherical convex surface 2 is formed as a spherical surface on the inner peripheral surface of the cylindrical body 3 provided outside the inner cylinder 1 having the spherical convex surface 2 on the outer peripheral surface of the intermediate portion in the axial direction. It is held slidably. A spherical concave surface 4 is formed on the inner peripheral surface of the cylindrical body 3, and the spherical concave surface 4 and the spherical convex surface 2 are in sliding contact with each other. An outer cylinder 5 which is integrally formed without being divided is provided on the outer side of the cylindrical body 3. The outer cylinder 5 has two recesses 6 which are recessed from the outside to the inside, and the recessed portion 7 also has the recesses 7 corresponding to the recesses 6. The recessed portion 7 receives a portion projecting inwardly of the recessed portion 6. A dust cover 8 for sealing a spherical sliding portion is provided between both axial ends of the cylindrical body 3 and both axial ends of the inner cylinder 1. Further, the tangent line that is in contact with the radially innermost circumference of the outer cylinder 5 and extends in the axial direction is located outside in the radial direction rather than the tangent line that passes through the radially outermost circumference of the spherical convex surface 2 of the inner cylinder 1 and extends along the axial direction. ing. There is a distance t between these tangents.

In order to manufacture the spherical sliding joint device as shown in the first embodiment, the inner cylinder 1 and the outer cylinder 5 are set at predetermined positions in the mold, and the cylinder 3 is placed between them. The resin material or the low friction rubber material forming the resin is injection molded. A resin material such as nylon or polyacetal is preferably used as the resin material forming the cylindrical body 3. As the low-friction rubber forming the cylindrical body 3, as proposed by the present applicant in Japanese Patent Application No. 4-229479, the raw material rubber is hydroxy stearoamide, erucyl amide, ethylene bis stearoamide,
A mixture of fatty acid amides such as stearamide, lauryl amide and palmityl amide is preferably used. Furthermore, a low-friction rubber is prepared by blending raw rubber in combination with or independently of the fatty acid amide, preferably 1 to 50 parts by weight of ultrahigh molecular weight polyethylene powder having a viscosity average molecular weight of 1,000,000 or more. You can also The outer cylinder 5 is a pipe-shaped metal fitting, and the recess 6 is formed at a desired position. The outer cylinder 5 and the cylinder 3 may be in a non-bonded state.

In the second embodiment shown in FIGS. 3 and 4,
A low friction sliding cloth 9 made of Teflon or the like is interposed between the spherical convex surface 2 and the spherical concave surface 4. The rest of the configuration is the same as that of the first embodiment, so its explanation is omitted.

In the third embodiment shown in FIGS. 5 and 6,
An example in which the recesses 6 are formed at two locations along the axial direction of the outer cylinder 5 is shown, and the one using the sliding cloth 9 as in the second embodiment is shown.

In the fourth embodiment shown in FIG. 7, the entire outer cylinder 5 except for the vicinity of both ends is formed on the convex portion 10 which is bulged outward in the radial direction, and the portion corresponding to the convex portion 10 of the cylindrical body 3 is formed. Is also the convex portion 11.

In the fifth embodiment shown in FIGS. 8 and 9, a small hole 12 is formed in the recess 6 of the first embodiment, and the resin layer 3A is also formed in the recess 6 through the small hole 12. It is a thing. By forming the resin layer 3A, the cylindrical body 3 is formed.
It is possible to firmly prevent the axial displacement between the outer cylinder 5 and the outer cylinder 5. It should be noted that the resin material for forming the cylindrical body 3 can be injected into the outer cylinder 5 using the small holes 12. Figure 10
11 and 12 are a front sectional view and a side sectional view of the outer cylinder of the fifth embodiment shown in FIGS.

The outer cylinder 5 shown in FIGS. 12 and 13 is a fifth cylinder.
It shows an example in which the small holes 12 of the outer cylinder 5 in the embodiment are formed not in the radial direction but in the axial direction.

A sixth embodiment shown in FIGS. 14 and 15 shows an example in which the elastic body 13 and the tubular metal member 14 are provided in the second embodiment, and a predetermined space is provided outside the outer cylinder 5 in the radial direction. A cylindrical metal fitting 14 is provided so as to be opened, and an elastic body 13 is vulcanized and bonded between the cylindrical metal fitting 14 and the outer cylinder 5. The elastic body 13 may be vulcanized and bonded between the cylindrical metal fitting 14 and the outer cylinder 5 first, and then the cylinder 3 may be injection-molded, or the cylinder 3 may be injection-molded first. The elastic member 13 vulcanized and bonded to the tubular metal member 14 may be press-fitted or press-fitted and bonded to the outer cylinder 5.

In the seventh embodiment shown in FIGS. 16 and 17, the shape of the dust cover 8 is changed and the cylindrical body 3 is used.
An example is shown in which the annular groove 3B is formed in the above, and one end of the dust cover 8 is press-fitted and attached to the annular groove 3B.

The eighth embodiment shown in FIGS. 18 to 20 shows an example in which an opening 15 is formed in the outer cylinder 5 and the opening 15 is filled with a resin material or a rubber material forming the cylinder 3. . By filling the opening 15 with a resin material or the like, it is possible to prevent the axial displacement of the cylindrical body 3 and the outer cylinder 5 from each other.

In the ninth embodiment shown in FIG. 21, both ends of the outer cylinder 5 are bent inward, and the cylindrical body 3 is inserted into the recess 16 surrounded by the both ends, whereby the outer cylinder 5 and the cylindrical body 3 are separated from each other. It shows an example in which deviation in the axial direction is prevented.

In the tenth embodiment shown in FIG. 22, a recess 17 is formed in a part of the outer cylinder 5 on the inner peripheral surface side in the axial direction.
The resin material or the like of the cylindrical body 3 is inserted into the tube 7.

[0021]

As described above, according to the present invention, since the outer cylinder which is not divided and integrally formed is provided on the outer side of the cylindrical body, the number of parts is reduced and the number of processing steps and the assembly steps are also reduced. Further, as this cylindrical body, an ordinary pipe-shaped metal fitting may be cut into a predetermined length, and the metal fitting may be processed to form a concave portion, a convex portion, an opening, or the like, which facilitates the processing and reduces the cost. Can be planned. Also,
Due to the presence of these concave portions and convex portions, relative displacement between the cylindrical body and the outer cylinder along the axial direction can be prevented. Further, since the axial tangent line passing through the innermost peripheral surface of the outer cylinder is radially outside than the axial tangent line passing through the outermost peripheral surface of the inner cylinder, the outer cylinder is formed from a plurality of parts as in the conventional case. It is not necessary to use pipe-shaped tubular metal fittings.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line A-O-B in FIG. 2 showing a first embodiment.

FIG. 2 is a front view of the first embodiment.

FIG. 3 is a sectional view taken along the line A-O-B in FIG. 4 showing a second embodiment.

FIG. 4 is a front view of the second embodiment.

5 is a sectional view taken along line AA of FIG. 6 showing a third embodiment.

FIG. 6 is a front view showing a third embodiment.

FIG. 7 is a side sectional view showing a fourth embodiment.

FIG. 8 is a sectional view taken along the line A-O-B in FIG. 9 showing a fifth embodiment.

FIG. 9 is a front view of the fifth embodiment.

10 is a cross-sectional view taken along the line AA of FIG.

FIG. 11 is a side sectional view of an outer cylinder used in the fifth embodiment.

12 is a cross-sectional view taken along the line AA of FIG.

FIG. 13 is a side sectional view showing a modified example of the outer cylinder.

FIG. 14 is a sectional view taken along the line A-O-B of FIG. 15 showing a sixth embodiment.

FIG. 15 is a front view showing a sixth embodiment.

16 is a sectional view taken along the line A-O-B in FIG. 17 showing the seventh embodiment.

FIG. 17 is a front view showing a seventh embodiment.

FIG. 18 is a side view showing an eighth embodiment in which an opening is formed in the outer cylinder.

19 is a cross-sectional view taken along line AOB of FIG.

FIG. 20 is a front view of the eighth embodiment.

FIG. 21 is a sectional side view of the ninth embodiment.

FIG. 22 is a side sectional view of the tenth embodiment.

FIG. 23 is a side sectional view showing a conventional example.

[Explanation of symbols]

 1 Inner Cylinder 2 Spherical Convex Surface 3 Cylinder 5 Outer Cylinder 6 Recess 7 Recess 10 Convex 11 Convex

Claims (1)

[Claims] 1. A spherical slide in which the spherical convex surface is slidably held on the inner peripheral surface of a cylindrical body made of a polymer material, which is provided outside an inner cylinder having a spherical convex surface on the outer peripheral surface of the intermediate portion in the axial direction. In the dynamic joint device, an outer cylinder integrally formed without being divided is provided on the outer side of the cylindrical body, and a concave portion or a convex portion is formed on the outer cylinder, and a concave portion or a convex portion corresponding thereto is formed on the cylindrical body. To prevent relative displacement between the cylinder and the outer cylinder along the axial direction, and the tangent line in the axial direction passing through the innermost peripheral surface of the outer cylinder is more radiused than the tangent line in the axial direction passing through the outermost peripheral surface of the inner cylinder. A spherical sliding joint device, which is located outside in the direction.