JPS60155011A - Spherical bearing and method of manufacturing thereof - Google Patents

Abstract

PURPOSE:To make it possible to apply a dust seal to a spherical bearing, simply and surely, by disposing a plastic material in a notch formed in the bearing surface of an opening edge at each end of a cylindrical body, and thereafter by subjecting the cylindrical body to a reducing process. CONSTITUTION:Plastic material 6 such as, for example, synthetic resin, rubber, etc. is inserted in a notch 5 formed circumferentially in the bearing surface of an opening edge at each end of a cylindrical body 2 to be formed into an outer race for an inner race 3. Further both ends of the cylindrical body 2 are subjected to a reducing process, to form the outer race as well to make it, possible to form a dust seal from the plastic material.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides an inner ring having a spherical portion on the outer peripheral surface and an inner ring having a -1-
It relates to a spherical bearing consisting of an outer ring formed with a concave arc surface corresponding to the spherical part of the inner ring and formed to rotatably hold the spherical part, and a method for manufacturing the same, in particular the upper and lower parts of the bearing surface. The present invention relates to a spherical bearing with a dust seal on the edge and a method for manufacturing the same.

(Prior art) Conventionally, in this type of spherical bearing, dry or wet lubrication is applied to the bearing surface, but it is necessary to prevent dust from entering through the gap between the lower edge of the outer ring and the spherical surface of the inner ring. Although it is desirable to have a dust sealing means for this purpose, there has been no suitable dust sealing means, and the arrangement for arranging the dust sealing member has been extremely complicated. For example, in the past, the outer ring was divided into two and the outer ring members were combined to hold the inner ring, and seal members were placed at the upper and lower opening edges of the bearing surface of the outer ring member, and the outer ring members were combined to seal the inner ring. There are some methods in which the members are arranged, but such methods not only complicate the structure, but also require means for combining the outer ring members, and there is a possibility that the sealing member may not be arranged in the optimum position, among other disadvantages. was there.

Traditionally, as a manufacturing method for spherical bearings, an inner ring having a spherical portion on at least a portion of the outer circumferential surface is fitted into a cylindrical body that is to become an outer ring, and the cylindrical body is drawn to form the above-mentioned spherical shape on the inner surface. There is a method in which a concave arc surface corresponding to the inner ring is formed and the inner ring is rotatably supported by the concave arc surface, and this manufacturing method has the advantage of being relatively simple and highly suitable for mass production. However, in this method, the upper and lower parts of the cylindrical body are narrowed down using the inner ring as a mold so as to correspond to the spherical part, so the inner surface of the outer ring and the spherical part are narrowed near the lower opening edge 1 of the outer ring. There will be more or less a gap between them. For this reason, it is preferable to further apply a dust sealing means as described above, but when this manufacturing method is used, the occurrence of the gap shown in - will differ depending on the product, and there will be errors for each product, so the technology will be required. It becomes difficult,
In reality, there was no device equipped with such a dust sealing method.

(Objective of the Invention) The object of the present invention is to provide a spherical bearing which eliminates the disadvantages of the conventional spherical bearing described in -F and allows a dust seal member to be accurately arranged with a simple structure. Another object of the invention is to provide a method by which such a spherical bearing can be manufactured easily.

(Structure of the Invention) The spherical bearing according to the present invention has a cylindrical body that is to become an outer ring.
By fitting an inner ring having a spherical part on at least a part of the outer peripheral surface and squeezing and pressurizing the cylindrical body, a concave arc surface corresponding to the notation shape part is formed on the inner surface, and - 1- A spherical bearing configured to rotatably hold the inner ring, the bearing surface of the outer ring having a downward opening [near the I edge, a notch is provided around the edge, and the notch is The basic structure is that a seal member made of plastic material is arranged.

In addition, the basic manufacturing method of the spherical bearing according to the present invention is to fit an inner ring having a spherical part on at least a part of the outer peripheral surface into a cylindrical body which is to become an outer ring, and to squeeze the cylindrical body. A method for manufacturing a spherical bearing in which an 11!1 arc surface corresponding to the 1-distributed spherical portion is formed on the inner surface of the spherical bearing, and the inner ring is rotatably supported by the concave arc surface. A notch is previously provided around the circumferential surface near the lower opening edge, and a plastic material is placed in this, and the crushing of the opening edge of the notch as described in -1- due to drawing T of the cylindrical body There is a method in which a plastic material is sandwiched and a part of the plastic material is brought into contact with the spherical part of the inner ring to form a dust seal member, and a notch is previously provided around the inner peripheral surface of the cylindrical body near the lower opening edge. The dust seal member is formed by drilling an injection hole extending from the outer surface of the outer ring to the notch shown in - and injecting a plastic material into the notch from the injection hole.

(Example) An example of a spherical bearing and a manufacturing method thereof according to the present invention will be described based on the drawings.

The method of manufacturing the spherical bearing, which is the object of the present invention, basically uses the conventional method shown in FIGS. 1 and 2, in which the outer circumference is The cylindrical body 2 is formed on its inner surface by fitting an inner ring 3 having a spherical part 3a on its surface and a shaft hole 3b in the center, and drawing the lower part of the cylindrical body 2 in the direction of the arrow p. This manufacturing method uses a concave arc surface as a bearing surface 1a to rotatably hold the spherical portion 3a. The method shown in Figure 1 is (
A) After squeezing and pressurizing a normal cylindrical bush as the cylindrical body 2 as shown in the figure.

(B) As shown in the figure, the outer surface of the outer ring is cut into a straight line 2b, and the lower end of the outer ring is further cut into a flat surface 2c. (C
) The method shown in FIG. 2 is a method for obtaining the product S shown in FIG. When a concave arc surface 2a is formed and drawn, the outer surface becomes a straight line as shown in Figure (B), and the lower end is cut into a flat surface 2c as shown in Figure (C). This is a method for obtaining a product S as shown in . Note that the cylindrical body 2 may be composed of multiple layers, or a bearing metal or the like may be placed on the bearing surface.
Furthermore, in a spherical bearing such as the one described above, wet or dry lubricating means 4 is generally applied to the bearing surface 1a.

The method for manufacturing a spherical bearing according to the present invention utilizes the method shown in FIG. 2 above, and the first method is as shown in FIG. A notch 5 consisting of a groove or the like is previously provided around the lower opening edge, and a plastic material 6 is placed in this. Then, when the upper and lower ends of the cylindrical body 2 are pressed in the direction of arrow P, the notch 5 is formed as shown in FIG. 3(B).
is plastically deformed and its opening edge is narrowed, the plastic material 6 is sandwiched, and a portion of the plastic material 6 is pressed against the spherical portion 3a, forming an optimal dust seal member 7 of the shape I#, 5. In this case, rubber, soft synthetic resin, etc. are suitable as the plastic material 6, and by arranging the dust seal member at the lower edge of the bearing surface, the lubrication means 4 applied to the bearing surface can be Not only can it be accurately sealed, but if a self-lubricating sheet or the like is provided as a lubrication means or if a bearing metal or the like is provided on the bearing surface, it can also be prevented from coming out. In this case, the notch 5 is removed from the outer surface of the cylindrical body l.
By providing a communication hole 5a leading to the cylindrical body 1, excess plastic material can escape from the communication hole 5a when the cylindrical body 1 is squeezed, and an appropriate amount of sealing member can be placed.

The second method of the method for manufacturing a spherical bearing according to the present invention is the fourth method.
As shown in the figure, notches 5 are previously provided around the inner peripheral surface of the cylindrical body l near the upper and lower opening edges, and an injection hole 8 is bored from the outer surface so as to communicate with the notches 5. The injection hole 8 may be formed in the cylindrical body in advance, or may be formed after the cylindrical body 1 is squeezed and pressurized. Plastic material 9 is inserted through the injection hole drilled in this way.
is injected to mold the dust seal member 10. In this case, the most suitable plastic material is synthetic resin, rubber, etc. In the case of synthetic resin, foamed resin can be used, and in the case of rubber, it can be vulcanized after injection molding. In addition,
In the case of synthetic resin, it is of course possible to perform heat treatment after molding.

When the dust seal member is molded in this way -
1- A part of the plastic material remains in the distribution hole 8, and this serves as an optimal anchor to accurately fix and support the dust seal member.

In the illustrated example, the L notch is formed in the shape of a groove, but it is not limited to this. For example, it is of course possible to form an rLJ-shaped step having a tapered inner wall surface from the outer ring mouth edge. be.

When manufacturing spherical bearings as described above, the dust seal member is made of plastic material, so even if there is a gap between the inner surface of the outer ring 1-de part and the spherical part of the inner ring, there may be errors in each product. can be absorbed accurately, and there are no variations depending on the product.

The spherical bearing according to the present invention is obtained by the manufacturing method described above, and has a simple structure in which a dust seal member made of a plastic material is disposed in a notch provided around the bearing surface near the 1-lower opening edge. The lubricating means disposed on the bearing surface can be accurately sealed.

(Effects of the Invention) According to the method for manufacturing a spherical bearing according to the present invention, an inner ring having a spherical portion on at least a portion of the outer circumferential surface is fitted into a cylindrical body to be an outer ring, and the cylindrical body is squeezed. By machining, a concave arc surface corresponding to the spherical portion is formed on the inner surface, and the concave arc surface is used as a bearing surface to rotatably hold the inner ring. In this case, a notch is provided in advance near the upper and lower opening edges of the inner peripheral surface of the cylindrical body, and the plastic material is placed in this, or an injection hole is drilled that communicates with the notch from the outer peripheral surface. Dust seal members can be easily placed on the upper and lower opening edges of the bearing surface by simply injecting the composition from
The lubricating means placed on the bearing surface can be accurately sealed, and the gap between the inner surface of the outer ring and the spherical part, which can occur in the bearing manufacturing method using the cylindrical body drawing method described above, can be particularly avoided in the product. Even if there are errors, these errors can be absorbed accurately.

In addition, when a self-lubricating sheet or bearing metal is placed on the bearing surface, it can also be used to prevent these from coming off, and in the past, various additions were made to the upper and lower edges of the bearing surface to prevent this from coming off. It is possible to easily solve difficult processes such as

The spherical bearing obtained as shown in L has a dust seal member disposed on the lower opening edge of the bearing surface, which can accurately seal the internal lubricating means and has a simple structure, which makes it suitable for this kind of spherical bearing. Ideal as a spherical bearing.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views for explaining the basic form of the spherical bearing and its manufacturing process, and FIGS. 3 and 4 show examples of the spherical bearing and its manufacturing method according to the present invention. FIG. 1: Outer ring, 2: Cylindrical body, 3: Inner ring, 3a two spherical parts 4: Lubrication means, 5: Notch, 6, 8: Plastic material? , 10: Dust seal member, 8: Injection hole Figure 1 (B) (C) Figure 2 (A) (B) (C) C)

Claims (1)

[Claims] 1. An inner ring having a spherical portion on at least a part of the outer circumferential surface is fitted into a cylindrical body that is to become an outer ring, and the cylindrical body is drawn, so that the inner surface of the cylindrical body is A spherical bearing in which a concave arc surface corresponding to the spherical portion is formed so that the inner ring is rotatably supported by the concave arc surface, the outer ring having a concave arc surface near the upper and lower opening edges of the concave arc surface. 1. A spherical bearing characterized in that a notch made of a groove or the like is provided around the circumference, and a dust seal member made of a plastic material is disposed in the notch. 2. A notch is formed near the upper and lower opening edges of the inner circumferential surface of the cylindrical body, and the plastic material disposed in the notch is crushed by the drawing process of the cylindrical body to crush the notch opening edge. The spherical bearing according to claim 1, wherein the spherical bearing is held and a part of the plastic material is pressed against the spherical surface of the inner ring to form a dust seal member. 3. An injection hole is formed from the outer surface of the outer ring to the notch, and the dust seal member is formed of a plastic material that is injected from the injection hole into the notch. The spherical bearing described in item 1. 4. The spherical bearing according to claim 1, wherein the plastic material is rubber. 5. The spherical bearing according to claim 1, wherein the plastic material is plastic. 6. An inner ring having a spherical part on at least a part of the outer peripheral surface is fitted into the cylindrical body which is to become the outer ring, and the cylindrical body is drawn to form a concave arc surface corresponding to the spherical part on its inner surface. A method for manufacturing a spherical bearing in which an inner ring is rotatably supported by the concave arc surface, wherein notches are provided in advance near the upper and lower opening edges of the inner circumferential surface of a cylindrical body, and the notches are formed with plasticity. The material is arranged, and the plastic material is pinched by the crushing of the open edge of the notch in 142 as the cylindrical body is drawn, and the - part of the plastic material is brought into contact with the spherical part of the inner ring. A manufacturing method characterized in that it is a dust seal member. 7. A communication hole is formed from the outer surface of the cylindrical body to the notch so that when one edge between the notches is crushed, the excess plastic material in the notch is compensated for. The manufacturing method according to claim 6. 8. An inner ring having a spherical portion on at least a part of the outer circumferential surface is fitted into a cylindrical body to be an outer ring, and the cylindrical body is drawn. A method for manufacturing a spherical bearing in which a concave arc surface corresponding to the spherical portion is formed on the inner surface, and the inner ring is rotatably supported by the concave arc surface, the method comprising A notch is previously provided around the outer ring, an injection hole is formed from the outer surface of the outer ring to the notch, and a plastic material is injected into the notch from the injection hole to form the dust seal member. 9. The manufacturing method according to claim 8, characterized in that the plastic material is rubber and is vulcanized after molding the dust seal member. 10. The plastic material is plastic. 11. Manufacturing method according to claim 8, characterized in that the plastic material is a foamed resin.