JPS636213A - Spherical plain bearing and its manufacturing method - Google Patents

Abstract

PURPOSE:To enable preferable clearance to be provided, by forming notched parts in the circumferential direction on a flange part formed on both ends of the outer wheel of a spherical plain bearing and also providing broken away parts on weld lines in an intermediate member between both an inner and the outer wheels. CONSTITUTION:A spherical plain bearing is constituted by a relatively thin and hollow cylindrical outer wheel with flange parts formed on both ends of its axial direction, a hollow inner wheel with a spherical formed outer circumferential surface and an intermediate member which is injection molded between these inner and outer wheels and constituting by the material whose melting point is lower than those of both the inner and the outer wheels. In such a bearing, notched parts in the circumferential direction are formed on at least one flange part of the outer wheel and also at least more than one broken away part are formed per the weld line which is generated when the intermediate member is injection molded. This broken away part is formed by imposing an outer force to try to pull out the inner wheel in the axial direction against the molded bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a spherical sliding bearing that has self-aligning properties, and consists of a spherical inner ring with a spherical outer circumferential surface and a relatively thin outer ring. This invention relates to a method for creating a gap in a spherical sliding bearing in which an intermediate member made of synthetic resin or a low melting point alloy (such as zinc alloy or aluminum alloy) is formed in between, and the spherical sliding bearing.

Prior Art Conventional bearing clearance technologies related to the present invention include: (1) A method in which a spherical inner ring and an intermediate member are rotated relative to each other to generate a clearance in the bearing due to wear.

(2) A method in which the spherical inner ring is fixed and the outer ring is struck from the radial direction to create clearance.

There was such a thing.

However, in the case of method (1), since the intermediate member is formed by injection molding, the inner ring and the intermediate member are firmly attached, and it takes a considerable amount of time to create a clearance by rotating the bearing relative to each other. This required large-scale equipment, which increased both man-hours and costs. In method (2), it is very difficult to uniformly strike the outer surface of the outer ring, and although it takes a lot of man-hours, there is a problem in that the gaps are not uniformly formed.

As mentioned above, the conventional method for creating gaps takes a long time to process and it is not possible to uniformly remove the gaps.

Problems to be Solved by the Invention The object of the present invention is to eliminate the drawbacks of the conventional techniques as described above, and to provide a spherical slide bearing that is inexpensive and easy to manufacture. The purpose of the present invention is to provide an optimal clearance method for mass-produced spherical plain bearings and a bearing thereof.

Means for Solving the Problems The spherical sliding bearing of the present invention and its manufacturing method have the following configuration as means for solving the above problems.

(1) A relatively thin hollow cylindrical outer ring with seven rungs formed at both ends in the axial direction, a hollow inner ring with a spherical outer circumferential surface, and injection molded between the outer ring and the inner ring. A spherical sliding bearing comprising an intermediate member made of a material having a melting point lower than that of the inner and outer rings, wherein at least one flange portion of the outer ring is formed with a notch in the circumferential direction; At least one weld line that occurs when forming the intermediate member is broken.

(2) The relatively thin hollow cylindrical outer ring is formed by plastically deforming a thin steel plate.

(3) forming seven rungs at both ends of a relatively thin hollow cylindrical outer ring; forming a circumferential notch in at least one of the seven rungs; A process of setting an inner ring with a spherical outer circumferential surface in a mold, and forming an intermediate member by injection molding a material having a lower melting point than that of the inner and outer rings into the intermediate part; At least the step of applying an external force to pull out the inner ring in the direction of the intermediate member and breaking one or more of the weld lines generated in the intermediate member.

(4) Before injection molding the intermediate member, the method may include the step of applying a heat-resistant solvent such as silicone to at least the outer spherical surface of the inner ring.

According to the present invention, the low strength of the weld dry that inevitably occurs in intermediate members formed by injection molding is utilized to apply an external force to cause υ to break at one or more locations, making it possible to ensure clearance. can.

Embodiment FIG. 1 is a front view showing one example of implementing the present invention. A weld line is a boundary area created when low melting point materials that enter the bearing from the sprue during injection molding collide with each other at the end of the flow, and are unstable compared to other areas due to the material structure. It's also getting weaker in strength. The figure shows a bearing in which sprues are formed at four locations in the circumferential direction from one axis, and four weld lines are formed. A bearing is shown that is broken at two of its four weld lines. The number of breaks in the weld line may be as long as one or more breaks even in the case of a four sprue method. The smaller the number of sprues, the better the material yield υ, but
Settings in this area may be determined depending on the usage conditions of the bearing.

FIG. 2 is a side sectional view of FIG. 1. The intermediate member and the outer ring are attached together in the axial direction by the outer ring flange and in the circumferential direction by the notch in the outer ring.

FIG. 3 is a sectional view showing a state in which a thin outer ring and a spherical inner ring are set in a mold, and a material having a lower melting point than the inner and outer rings is injection molded. The injection material entering from the sprue flows out in the axial direction, collides with the opposite wall surface, and flows out in the radial direction in an arc shape. Then, it collides with the injected material in the opposite direction, creating a weld line and forming an intermediate member.

To make it easier to break the weld line, the inner ring is soaked in a solvent before injection molding and then set in the mold. Then, during injection molding, the solvent adhering to the inner ring surface is blown away by the injection material flowing out at high temperature and pressure.
It is mixed in the weld line part, further weakening this part. As a result of examining and experimenting with various solvents, it was found that a silicone-based heat-resistant solvent is the most suitable.

? Figure J4 is a sectional view showing the bearing clearance device.

Set the spherical plain bearing on the die, apply a load (F') only to the spherical inner ring with a punch, and pull out the inner ring from the bearing to break the weld line.

After injection molding, the intermediate member, which is a low-melting point material, shrinks and creates a slight gap between it and the thin outer ring, and when the intermediate member is divided, a gap is created between the spherical inner ring and the intermediate member. .

Effects of the invention (1) If the outer ring is made of a thin steel plate, plastic working becomes possible and mass production is possible.

(2) Since the intermediate member is formed by injection molding, it can be produced easily at low cost.

(3) Bearing clearance can be mass-produced and formed reliably.

(4) The intermediate member is securely fixed to the outer ring through the notch in the flange.

(5) It is possible to manufacture a spherical slide bearing with a reliable clearance at low cost.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of the implementation of the present invention, Fig. 2 is a side sectional view, Fig. 3 is a sectional view of a bearing manufacturing device, and Fig. 4 is a sectional view of a bearing clearance device. . Patent applicant: Agent of Nippon Thomson Co., Ltd.
Kobashi - Masaaki Kobashi, 1

Claims (1)

[Claims] 1. A relatively thin hollow cylindrical outer ring with flanges formed at both ends in the axial direction, a hollow inner ring with a spherical outer circumferential surface, and a space between the outer ring and the inner ring. In a spherical sliding bearing comprising an injection-molded intermediate member made of a material having a lower melting point than the inner and outer rings, a notch in the circumferential direction is formed in at least one flange portion of the outer ring, and A spherical plain bearing characterized in that the member is broken at at least one location of a weld line that occurs when forming the intermediate member. 2. The spherical plain bearing according to claim 1, wherein the relatively thin hollow cylindrical outer ring is formed by plastically deforming a thin steel plate. 3. Forming flanges at both ends of a relatively thin hollow cylindrical outer ring, forming a circumferential notch in at least one of the flange parts, and forming the outer ring and the outer periphery located inside the outer ring. A process of setting an inner ring with a spherical surface in a mold and injection molding a material with a melting point lower than that of the inner and outer rings into the intermediate part to form an intermediate member, and inserting the inner ring in the axial direction with respect to the molded bearing. A method for manufacturing a spherical plain bearing, characterized in that the manufacturing method comprises at least the step of applying an external force to cause the intermediate member to break at one or more locations of a weld line generated in the intermediate member. 4. The spherical plain bearing according to claim 3, further comprising the step of applying a heat-resistant solvent such as silicone to at least the outer spherical surface of the inner ring before injection molding the intermediate member. Manufacturing method.