JP2017040275A - Radial spherical face slide bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a radial spherical face slide bearing which can easily cope with the other use condition while being usable at the non-supply of oil in a support use of one direction load particularly.SOLUTION: A spherical inner face 3 of an outer ring 4 is formed of a first semi-spherical recessed face 9 which is formed at an internal peripheral half-peripheral side of annular parts (5, 12) of the outer ring 4, and a second semi-spherical recessed face 10 including a lubricant 13 which is anchored to only an internal peripheral half-peripheral side which is opposite to the first semi-spherical recessed face 9. By this constitution, the first semi-spherical recessed face 9 or the second semi-spherical recessed face 10 which is arranged at a side to which a radial load is applied is selected, and the load can be applied to a slide contact face between the selected semi-spherical recessed face and a spherical outer face 1. A radial spherical slide bearing becomes usable in an oil non-supply condition by the second semi-spherical recessed face 10 including the lubricant 13. Also, the radial spherical slide bearing is utilized in use in the other use condition by the first semi-spherical recessed face 9.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radial spherical plain bearing.

  Spherical plain bearings have an inner ring with a spherical outer surface and an outer ring with a spherical inner surface. The spherical outer surface and the spherical inner surface form a sliding contact surface that can carry radial loads and axial loads in both directions. Such self-aligning type plain bearings, among them, those that mainly support a radial load are called radial spherical plain bearings. Generally, radial spherical plain bearings are roughly classified into an oil supply type that is used by periodically supplying oil and an oilless type that can be used without oil supply.

  Oil-free radial spherical plain bearings are suitable for use in supporting a unidirectional load in which a radial load is applied from only one direction and for supporting fine motion. Above all, the outer ring is made of resin such as steel, stainless steel, etc., and the outer ring is made of plastic grease, resin liner, graphite, molybdenum disulfide, etc. It is superior in terms of mechanical strength and temperature characteristics as compared with the outer ring, and is widely used in products offered to the market as general-purpose products (for example, Patent Documents 1 to 3).

Japanese Utility Model Publication No. 6-14540 JP 2007-232092 A JP 2012-77870 A

  Conventional non-lubricated radial spherical plain bearings have a lubricant on the entire inner circumference of the annular part of the outer ring and can handle rotational loads that rotate in the radial load direction. In the case of applications, the sliding contact surface between the spherical outer surface and the spherical inner surface occurs only in the half circumference on the side that receives the load in one direction, so most of the lubricant fixed outside the narrow circumferential range is in sliding contact. Not effective for surface lubrication.

  Further, depending on various conditions such as the magnitude of the load, the sliding speed, and the presence of maintenance oil supply, the fixing lubricant may not be necessary for the annular portion, but the lubricant may be a disadvantageous material.

  Therefore, the problem to be solved by the present invention is a radial spherical plain bearing that can be used for non-lubricated use, particularly in a unidirectional load support application, but can easily cope with other use conditions other than non-lubricated. Is to get.

  In order to achieve the above object, the present invention provides a radial spherical plain bearing comprising an inner ring having a spherical outer surface and an outer ring having a spherical inner surface, wherein the outer ring has an annular portion formed of metal. A spherical inner surface includes a first hemispherical concave surface formed on the inner peripheral semicircular side of the annular portion, and a second lubricant containing a lubricant fixed only on the inner peripheral semicircular side opposite to the first hemispherical concave surface. The structure which consists of a hemispherical concave surface of this is employ | adopted.

  According to the above-described configuration, the first hemispherical concave surface or the second hemispherical concave surface arranged on the radial load application side is selected in a unidirectional load supporting application, and the sliding contact between the selected one and the spherical outer surface is selected. The radial load can be applied to the surface. The second hemispherical concave surface containing the lubricant can be used for oil-free use. On the other hand, the 1st hemispherical concave surface which consists of a metal which forms a cyclic | annular part has a different property from the 2nd hemispherical concave surface containing a lubricant, and can be utilized for correspondence to other use conditions.

  A radial spherical plain bearing in which a radial load is applied only in one direction and the second hemispherical concave surface is disposed on the load side can be used without lubrication.

  Further, a fixing surface having a diameter larger than that of the second hemispherical concave surface is formed on the inner peripheral semicircular side opposite to the annular portion, and the lubricant is provided between the fixing surface and the spherical outer surface. It is preferable that it consists of plastic grease filled in. Plastic grease has excellent self-lubricating property due to the good fixed lubricity of the resin itself and the lubricity of the oil content, and is therefore suitable for use without lubrication.

  In particular, if a radial spherical plain bearing in which a radial load is applied in only one direction and the first hemispherical concave surface is arranged on the load side is used, the first hemispherical concave surface made of metal harder than plastic grease is used. Since a load is applied, a bearing rigidity superior to that applied to the second hemispherical concave surface can be obtained. Therefore, the oil-free property is not required, but it is possible to cope with the use conditions where high-precision support is required.

  Further, a radial spherical plain bearing in which the lubricant is made of an oil-containing material and the bearing internal clearance is negatively provided may be used. In this way, even when a load is applied to the first hemispherical concave surface, the lubricant contained in the second hemispherical concave surface comes into contact with the spherical outer surface of the inner ring and oozes out from the lubricant. Oil adheres to the spherical outer surface. Therefore, in the use condition in which the inner ring and the outer ring are repeatedly rotated relative to each other by a half or more, the sliding contact surface between the spherical outer surface and the first hemispherical concave surface on the load side can be lubricated by the oil adhering to the spherical outer surface.

  The outer ring is divided at two locations facing each other in the radial direction, and a first divided piece of the two divided pieces has the first hemispherical concave surface, and the remaining second divided pieces. It is preferred that the piece has the second hemispherical concave surface. If it does in this way, it will become easy to give different processing to the 1st hemispherical concave surface and the 2nd hemispherical concave surface.

  The metal is preferably an iron-based material. Examples of the metal forming the annular portion include iron-based materials, bearing alloys, and copper alloys. Among these, iron-based materials such as bearing steel and stainless steel are suitable for general-purpose products in terms of mechanical strength, cost, and workability.

  As described above, according to the present invention, the use of the above configuration allows the second hemispherical concave surface to be used for non-lubricating use in a one-way load supporting application, but other use conditions other than non-lubeing. In addition, it is possible to obtain a radial spherical plain bearing that can be easily handled by the first hemispherical concave surface.

(A) is a longitudinal front view of a radial spherical plain bearing according to an embodiment of the present invention, and (b) is a longitudinal side view of the radial spherical plain bearing.

  Hereinafter, a radial spherical plain bearing according to an embodiment of the present invention will be described with reference to FIG. The radial spherical plain bearing shown in FIG. 1 includes an inner ring 2 having a spherical outer surface 1 and an outer ring 4 having a spherical inner surface 3. In the following, the direction along the central axis of the inner ring 2 and the outer ring 4 is simply referred to as “axial direction”, and the direction perpendicular to the central axis is simply referred to as “radial direction”. The circumferential direction is simply called “circumferential direction”.

  The spherical outer surface 1 is formed on the entire outer periphery of the inner ring 2 as a convex spherical shape whose center is set on the central axis of the inner ring 2. On the inner periphery of the inner ring 2, a fitting surface used for fitting with a mounting partner (not shown) is formed.

  The inner ring 2 is made of an iron-based material. Here, the iron-based material means a metal material having an iron ratio of 50% by weight or more among the constituent elements, for example, high carbon chromium bearing steel defined in Japanese Industrial Standard (JIS), Examples include stainless steel. Although the inner ring 2 is exemplified by a single iron-based material, it may be formed of a plurality of materials or a non-ferrous material such as a copper alloy, an aluminum alloy, or a resin. For example, the outer peripheral side of the inner ring 2 may be a back metal part formed of an iron-based material, and the spherical outer surface 1 may be formed of a different material different from the back metal part. Examples of the other material include film materials such as hard chrome plating, phosphate coating, and molybdenum disulfide dry coating.

  The outer ring 4 is divided at two locations facing each other in the radial direction. One of the two divided pieces is a first divided piece 5, and the other is a second divided piece 6. When the circumferential end surfaces 7 and 7 formed on the first divided piece 5 and the circumferential end surfaces 8 and 8 formed on the second divided piece 6 are combined, the outer ring 4 is obtained. The circumferential end surfaces 7, 7, 8, 8 are flat surfaces along the axial plane.

  The inner surface of the first divided piece 5 is a first hemispherical concave surface 9 corresponding to half of the spherical inner surface 3. The inner surface of the second divided piece 6 is a second hemispherical concave surface 10 corresponding to the remaining half of the spherical inner surface 3. The outer surface of the first divided piece 5 and the outer surface of the second divided piece 6 are the outer periphery of the outer ring 4. The outer periphery of the outer ring 4 includes a fitting surface 11 used for fitting with the mounting partner. When the fitting surface 11 is tightly fitted to the inner circumference of the attachment counterpart, the state of the outer ring 4 in which the circumferential end surfaces 7 and 8 are combined can be maintained.

  The entire first divided piece 5 is formed of the same metal material as that of the inner ring 2. On the other hand, the second divided piece 6 includes a back metal part 12 made of the same metal material as the first divided piece 5 and a lubricant 13 fixed only to the back metal part 12.

  The second hemispherical concave surface 10 is formed by the lubricant 13.

  When the circumferential end surfaces 7 and 8 of the two divided pieces 5 and 6 are combined to form the outer ring 4, the first divided piece 5 and the back metal part 12 are connected in the circumferential direction by the metal of the same iron-based material. The formed annular part (5, 12) is constituted. A first hemispherical concave surface 9 formed on the inner peripheral semicircular side (first divided piece 5) of the annular portion (5, 12), and a first hemispherical concave surface 9 of the annular portion (5, 12). The second hemispherical concave surface 10 containing the lubricant 13 fixed only on the inner peripheral semicircular side (back metal part 12) opposite to the inner peripheral surface 3 constitutes the spherical inner surface 3.

  The annular portion (5, 12) may be formed of a non-ferrous metal such as a copper alloy or an aluminum alloy. The annular portion (5, 12) is exemplified by a single iron-based material, but may be formed of a plurality of materials or a non-ferrous material such as a copper alloy or an aluminum alloy. Good.

  The spherical inner surface 3 is a concave sphere set at the same center as the spherical outer surface 1. The spherical diameter of the spherical inner surface 3 is set to be smaller than the spherical diameter of the spherical outer surface 1, thereby providing a negative bearing internal clearance.

  A fixing surface 14 having a diameter larger than that of the second hemispherical concave surface 10 is formed on the opposite inner peripheral semicircular side (back metal portion 12) of the annular portions (5, 12). The fixing surface 14 is formed as a hemispherical concave surface as a whole. A plurality of circumferential grooves are formed on the fixing surface 14 for the purpose of improving the fixability of the lubricant 13.

  The lubricant 13 is made of plastic grease filled between the fixed surface 14 and the spherical outer surface 1. Here, the plastic grease is an oil-impregnated material obtained by solidifying a mixture of a resin such as ultrahigh molecular weight polyethylene or ultrahigh molecular weight polyolefin and grease with heat and cooling. The lubricant 13 is fixed by the above-described filling so as to compensate for the difference in diameter between the fixing surface 14 and the second hemispherical concave surface 10.

For example, as a plastic grease, lubricating grease 5 to 99 having 95 to 1% by weight of ultrahigh molecular weight polyethylene having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ and a dropping point higher than the gelation temperature of the ultra high molecular weight polyethylene. After filling with a mixture consisting of% by weight, the mixture is heated above the gelation temperature of ultra high molecular weight polyethylene and then cooled and solidified. As another example of the plastic grease, the lubricating grease having a dropping point higher than the gel point of an ultrahigh molecular weight polyolefin having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ and having a particle size of 1 to 100 μm An ultrahigh molecular weight polyolefin powder of 95 to 1% by weight may be mixed and dispersed and held at a temperature equal to or higher than the gel point.

  The type of the lubricant 13 may be determined according to required fixing property, self-lubricating property, wear resistance, etc., and is not limited to plastic grease. Other lubricants include, for example, oil-impregnated materials such as woven fabrics, felts, and sponges containing lubricating oil, polytetrafluoroethylene (PTFE), graphite, molybdenum disulfide, and the like. When the lubricant 13 is an oil-containing material, the oil that has oozed out of the lubricant 13 spreads on the sliding contact surface, so there is no need to use the entire surface of the second hemispherical concave surface 10 as the lubricant 13.

  This radial spherical plain bearing is as described above, and is used for supporting a unidirectional load in which a radial load is applied from only one direction. Since the outer ring 4 has a split structure, the radial load may be in a direction having a 90 ° phase difference with respect to the division position of the outer ring 4. Hereinafter, a case where a radial load is applied from the inner ring 2 will be described as an example.

  As shown in FIG. 1B, when the radial load is applied only from the direction of the arrow A, the second hemispherical concave surface 10 disposed on the side receiving the load and the spherical outer surface 1 of the inner ring 2 A load is applied to the sliding contact surface. This radial spherical plain bearing can be used without lubrication until the self-lubricating property of the lubricant 13 contained in the second hemispherical concave surface 10 reaches the end of its life.

  Further, this radial spherical plain bearing is suitable for use without lubrication because plastic grease having excellent self-lubricating property among oil-containing materials is filled between the fixed surface 14 and the spherical outer surface 1. In addition, foreign matter can be prevented from entering the sliding contact surface.

  On the other hand, when the radial load is applied only from the direction of the arrow B shown in FIG. 1B, the slip between the first hemispherical concave surface 9 arranged on the side receiving the load and the spherical outer surface 1 of the inner ring 2 A load is applied to the contact surface. Since the first hemispherical concave surface 9 is made of a metal suitable for the annular portions (5, 12) that govern the mechanical strength of the outer ring 4, the second hemispherical concave surface 9 contains the lubricant 13 made of plastic grease. The surface has a hardness superior to that of the hemispherical concave surface 10. For this reason, the radial load applied to the first hemispherical concave surface 9 is more rigid than the case where the second hemispherical concave surface 10 containing the lubricant 13 is loaded (particularly regarding radial displacement). Becomes higher. The first hemispherical concave surface 9 is allowed to be arranged on the load receiving side in this way under the condition that sufficient lubrication is obtained on the sliding contact surface between the first hemispherical concave surface 9 and the spherical outer surface 1. This is the case. Therefore, this radial spherical plain bearing can be used for the other usage conditions in which the first hemispherical concave surface 9 is utilized as it is, and no oil-free property is required, but high-precision support is required. .

  Further, this radial spherical plain bearing is made of plastic grease, which is a kind of oil-containing material, and the bearing internal clearance is set to be negative. Therefore, even when a radial load in the direction of arrow B is applied, 2, the lubricant 13 contained in the hemispherical concave surface 10 is in contact with the spherical outer surface 1, and oil that has oozed out of the lubricant 13 adheres to the spherical outer surface 1. Therefore, in a use condition in which the inner ring 2 and the outer ring 4 are repeatedly rotated relative to each other by a half or more, lubrication on the sliding contact surface between the spherical outer surface 1 and the load-side first hemispherical concave surface 9 is caused by oil adhering to the spherical outer surface 1. Can be achieved.

  In the case of use conditions where oil can be supplied by applying grease during maintenance, the sliding contact surface between the first hemispherical concave surface 9 and the spherical outer surface 1 can be sufficiently lubricated with the applied grease. The lubricant 13 may be a lubricant other than an oil-impregnated material such as plastic grease. For example, the lubricant 13 may be a lubricant having higher wear resistance and hardness.

  In addition, this radial spherical plain bearing is different from the second hemispherical concave surface 10 in terms of the properties of the first hemispherical concave surface 9 under other usage conditions that cannot be accommodated by the first hemispherical concave surface 9. It is also possible to change and give correspondence to the use conditions. For example, when the first hemispherical concave surface 9 disposed on the load side is used under conditions where the wear resistance, hardness, etc. are insufficient, the first hemispherical concave surface 9 is subjected to surface modification such as quenching and carbonitriding. Or by applying a coating such as hard chrome plating, phosphate coating, dry coating of molybdenum disulfide, diamond-like carbon coating, etc., the first hemispherical concave surface 9 can be used to support the use conditions. Can be granted. These surface modification and surface treatment of the coating may be performed within a tolerance of dimensional change from the first hemispherical concave surface 9 before the processing, or the first hemispherical concave surface 9 is shaved to ensure the film thickness. You may do as follows. In particular, under low load and low speed use conditions, it is possible to support the use without lubrication by arranging the first hemispherical concave surface 9 on the load side by performing additional surface treatment utilizing the first hemispherical concave surface 9 There is also a possibility.

  Further, in this radial spherical plain bearing, the outer ring 4 is divided at two locations facing each other in the radial direction, and the first divided piece 5 of the two divided pieces has the first hemispherical concave surface 9. Then, since the remaining second divided piece 6 has the second hemispherical concave surface 10, different processing is performed on the first hemispherical concave surface and the second hemispherical concave surface, for example, processing of the fixing surface 14 described above, It is easy to perform surface modification of the first hemispherical concave surface 9 or the like.

  Each embodiment disclosed this time should be considered as illustrative in all points and not restrictive. Accordingly, the scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Spherical outer surface 2 Inner ring 3 Spherical inner surface 4 Outer ring 5 1st division | segmentation piece 6 2nd division | segmentation piece 7, 8 Circumferential end surface 9 1st hemispherical concave surface 10 2nd hemispherical concave surface 11 Mating surface 12 Back metal part 13 Lubricant 14 Fixing surface

Claims (7)

In a radial spherical plain bearing comprising an inner ring having a spherical outer surface and an outer ring having a spherical inner surface, wherein the outer ring has an annular portion formed of metal,
The spherical inner surface includes a first hemispherical concave surface formed on the inner peripheral semicircular side of the annular portion and a lubricant fixed only on the inner peripheral semicircular side opposite to the first hemispherical concave surface. A radial spherical plain bearing comprising two hemispherical concave surfaces.   The radial spherical plain bearing according to claim 1, wherein a radial load is applied only in one direction, and the second hemispherical concave surface is disposed on a side receiving the load.   A fixing surface having a diameter larger than that of the second hemispherical concave surface is formed on the opposite inner peripheral semicircular side of the annular portion, and the lubricant is interposed between the fixing surface and the spherical outer surface. The radial spherical plain bearing according to claim 1 or 2, comprising a filled plastic grease.   The radial spherical plain bearing according to claim 1, wherein a radial load is applied only in one direction, and the first hemispherical concave surface is disposed on a side receiving the load. The lubricant is made of an oil-containing material,
The radial spherical plain bearing according to any one of claims 1 to 4, wherein the bearing internal clearance is negatively provided.   The outer ring is divided at two locations facing each other in the radial direction, the first divided piece of the two divided pieces has the first hemispherical concave surface, and the remaining second divided pieces are The radial spherical plain bearing according to any one of claims 1 to 5, wherein the radial spherical plain bearing has the second hemispherical concave surface.   The radial spherical plain bearing according to any one of claims 1 to 6, wherein the metal is an iron-based material.

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