JP2006112585A - Bearing ring for roller bearing and manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively remove attached foreign matter of rollers and reduce abrasion of a roller rolling surface and a raceway surface of a bearing ring. <P>SOLUTION: The bearing ring for a roller bearing has the raceway surface 12a, 14a with which the rollers 16 are in rolling contact. The raceway surface 12a, 14a are knurled, are plated with soft metal 18 over all and then are polished so that the soft metal 18 is filled in recesses 12c, 14c. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a roller bearing raceway, and more particularly to a roller bearing raceway used by being incorporated in a mechanism or the like in which foreign matter such as dust or carbon suit is mixed in lubricating oil, and The present invention also relates to a method for producing the roller bearing race.

For example, in a diesel engine, if combustion products such as carbon suits generated in the engine and other foreign matters are mixed in the engine oil, there is a problem that the sliding surface inside the engine may be damaged, such as wear. This is not preferable for the engine (see Patent Document 1). Also in cam followers and needle roller bearings used in engine valve mechanisms, other various cam mechanisms, planetary gear mechanisms, etc., these foreign objects enter the bearings, and the rolling surfaces of the rollers and the raceways of the races If it adheres to the surface, these wears are promoted, resulting in an early deterioration of rolling characteristics and a shortened life of the roller bearing, and there is also a problem that the performance of each of the above mechanisms is reduced.
Japanese Patent Application Laid-Open No. 08-0354408

  The problem to be solved by the present invention is to efficiently remove foreign matters attached to the rollers and reduce wear of the roller rolling surfaces and raceway surfaces.

  The roller bearing raceway according to the present invention is a roller bearing raceway having a raceway surface with which the roller is in rolling contact. After the plating is performed, the convex portion is polished, and the soft metal is left in the concave portion as a metal for removing at least a foreign substance adhering to the roller.

  In the above case, when the roller bearing is a radial roller bearing, the uneven processing may be performed on the entire circumference of the raceway surface, but may be formed at least in a load zone that receives a radial load or in a region in front of the load zone in the rotation direction. Further, the concave portion may have a depth and a width that allow the concave portion to remain even if the convex portion is polished, and is appropriately determined by an experiment or the like.

  The bearing ring includes a housing and a shaft used as the outer ring in addition to the outer ring or the inner ring itself of the roller bearing, and may be hollow or solid.

  According to the outer ring for a roller bearing of the present invention, when the roller contacts and moves on the soft metal embedded in the concave portion of the raceway surface, the foreign matter adhering to the roller is removed by the soft metal and buried in the soft metal. As a result, the amount of foreign matter caught in the roller rolling surface and raceway surface is reduced, and wear of the roller rolling surface and raceway surface is suppressed.

  A method for manufacturing a roller bearing race ring according to the present invention is a method of manufacturing a roller bearing race ring having a raceway surface with which a roller is in rolling contact, and a concave / convex machining step for processing the surface of the race ring member into irregularities, A heat treatment step for heat-treating the bearing ring member; a plating step for plating the bearing ring member with a soft metal; and a convex portion of the bearing ring member is polished to expose a surface of the bearing ring member. And a polishing step in which a soft metal is left in the recess of the ring member as a metal for removing at least a foreign substance adhering to the roller.

  It is preferable that the concavo-convex processing step is a step of processing the surface of the bearing ring member into a mesh-like concavo-convex by one processing selected from knurling, etching, and stamping.

  The soft metal used in the plating process is preferably at least one selected from gold, silver, copper, tin, indium, zinc, and aluminum, or a base alloy thereof.

  According to the bearing ring for roller bearing of the present invention, the amount of foreign matter such as a carbon suit between the raceway surface and the rolling surface can be reduced, so that the wear resistance can be improved.

  Hereinafter, a roller bearing raceway and a method of manufacturing the same according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a roller bearing provided with a bearing ring according to the embodiment. A roller bearing 10 shown in FIG. 1 is used for oil lubrication in an engine such as a diesel engine. As an example, the roller bearing 10 includes an annular race ring (hereinafter referred to as an outer ring) 12 disposed on the outer side of the diameter. A full-roller type roller bearing configuration in which a plurality of rollers 16 are interposed between a shaft-shaped raceway ring (hereinafter referred to as an inner ring) 14 arranged on the inner side of the diameter. The outer ring 12 may be a housing other than a general outer ring. The inner ring may be a hollow inner ring for a general rolling bearing. The roller bearing of the present invention may be a roller bearing with a cage, not a full roller type roller bearing, or a type without an outer ring or a type without an inner ring. In the roller bearing 10, the roller 16 includes a needle roller. As a basic structure of the roller bearing 10 to which the present invention is applied, it is preferable to include a plurality of rollers and at least one raceway in which the rollers make rolling contact.

  The inner ring 14 is made of steel, and has a raceway surface 14a with which the rollers 16 are in rolling contact. The steel type of the steel material is not particularly limited, such as stainless steel, bearing steel, carbon steel, and carburized steel. The inner ring raceway surface 14a is processed into a concavo-convex surface having a large number of convex portions 14b and concave portions 14c by knurling, and thereafter various heat treatments such as quenching and tempering and various surface treatments such as carburizing, carbonitriding, and nitriding. It has been subjected. By this surface treatment, the raceway surface 14a is set to a surface hardness of about 60 to 65 HRC, for example. After the inner ring 14 is plated with the soft metal 18 that is sufficiently softer than the surface hardness on the entire raceway surface 14a, the soft metal 18 on the convex portion 14b is removed by polishing, and the inner ring 14 is in the concave portion 14c. The soft metal 18 is left and buried. A part of the inner ring raceway surface 14a is shown enlarged in a circle.

  In the embodiment, the recess 14c is provided on the entire circumference of the inner ring raceway surface 14a. However, the radial load load zone of the inner ring raceway surface 14a or the load zone before the roller 16 enters the load zone. It may be provided only in the raceway surface area.

  The knurling process is also called a knurling process. Generally, the knurling process is formed by a tool, a machine, or a device dedicated to knurling in order to prevent slippage on the outer diameter surface of a round object and increase a friction coefficient at a connection part of a press-fitting part. In the embodiment, the inner ring raceway surface 14 a is knurled to form a concave portion 14 c in a mesh shape (including a lattice shape), and the concave portion 14 c is used as an embedded space for the soft metal 18. The pattern of the concave portion by knurling can be variously selected such as a dot pattern or a spiral pattern in addition to the mesh pattern as in the embodiment. The depth and opening shape of the recess 14c by knurling can be selected as appropriate. The concave portion 14c of the embodiment has a triangular cross-sectional shape, but is not limited to the cross-sectional shape such as a semicircular cross-sectional shape.

  The inner ring 14 is provided with mechanical properties such as required hardness and toughness by various heat treatments such as quenching and tempering, and then the surface is hardened by surface treatment such as carburizing, carbonitriding, nitriding, and the wear resistance. Has been granted.

  The entire surface of the inner ring 14 is plated. Examples of plating include dry plating such as CVD (chemical vapor deposition) and PVD (physical vapor deposition), and wet plating such as electric plating and chemical (electroless) plating. Examples of the soft metal used for plating include gold, silver, copper, tin, indium, zinc, and aluminum, and the soft metal in the embodiment is at least one selected from these or a base alloy thereof. .

  In the roller bearing having the above configuration, when the roller 16 contacts and moves on the soft metal 18 embedded in the recessed portion 14c of the inner ring raceway surface 14a, the foreign matter attached to the roller 16 is soft metal 18. And is buried in the soft metal 18. As a result, the amount of foreign matter caught in the roller rolling surface 16a and the inner ring raceway surface 14a is reduced, and the wear of the roller rolling surface 16a and the inner ring raceway surface 14a is reduced. It is suppressed.

  A method for manufacturing a roller bearing race will be described with reference to FIGS. As shown in FIG. 2, this manufacturing method includes a bearing ring member preparation step, a knurling step, a heat treatment step, a plating step, and a polishing step.

  In the bearing ring member preparing step, a bearing ring member 14 as shown in FIGS. 3 (a) and 3 (b) is prepared (for the sake of understanding, the reference numerals are the same as those of the inner ring). FIG. 3A is a side view of the bearing ring member 14, and FIG. 3B is a cross-sectional view of the bearing ring member 14. The material of the bearing ring member 14 is an appropriate steel material such as stainless steel, bearing steel, tool steel, and the like.

  In the knurling process, the outer diameter surface 14a of the bearing ring member 14 is processed into a shape as shown in FIGS. 4A is a side view of the knurled bearing ring member 14, and FIG. 4B is a cross-sectional view of the knurled bearing ring member 14. By this knurling process, a convex portion 14b and a concave portion 14c are formed on the outer diameter surface 14a of the bearing ring member 14 in a mesh shape. Illustration of tools, machines, and devices used for knurling is omitted. The size of the recess 14c is not limited as long as the soft metal 18 can be accommodated in an amount capable of removing foreign matter from the roller rolling surface 16a. Moreover, the space | interval of the adjacent recessed part 14c can be set suitably by experiment etc.

  In the heat treatment step, the knurled bearing ring member 14 is subjected to appropriate heat treatment, for example, general heat treatment and surface treatment (carburization, carbonitriding, nitriding treatment, etc.).

  In the plating process, as shown in FIGS. 5A and 5B, the entire ring member 14 is plated with a soft metal 18. FIG. 5A is a side view of the heat-treated track ring member 14, and FIG. 5B is a cross-sectional view of the heat-treated track ring member 14. This plating includes dry plating such as CVD and PVD, and wet plating such as electric plating and chemical (electroless) plating. In the embodiment, electroless plating is preferable. The soft metal used for the plating includes at least one metal selected from gold, silver, copper, tin, indium, zinc, and aluminum, or a base alloy thereof, which is softer than the race member.

  In the polishing step, as shown in FIGS. 6A and 6B, the soft metal 18 plated on the convex portion 14b of the bearing ring member 14 is removed by the convex portion polishing, and the bearing ring member 14 is removed. And the soft metal 18 in the recess 14c of the bearing ring member 14 is not removed but left as a foreign material removing / buried metal. FIG. 6A is a side view of the polished member 14 for a bearing ring, and FIG. 6B is a cross-sectional view of the member 14 for a polished ring.

  When the roller 16 rolls on the raceway surface 14a as the inner ring 14 when the roller 16 rolls on the raceway surface 14a and crosses over the soft metal 18 provided on the raceway surface 14a, Foreign matter such as a carbon suit adhering to the roller rolling surface 16a is transferred to the soft metal 18 and is removed. Since the foreign material is held in the soft metal 18 in this manner, the foreign material transferred to the soft metal 18 can be suppressed or prevented from moving to the surroundings, and the foreign material is reattached when it newly rolls. Can be suppressed or prevented. In particular, since the recess 14c is formed in a mesh shape and is provided over the entire length of the inner ring 14, and the soft metal 18 is embedded in the recess 14c, it is possible to effectively remove foreign matters such as carbon suit that adhere to the entire contact area of the roller 16. Can do.

  As described above, in the present embodiment, the amount of foreign matter in the roller 16 and the inner ring 14 is greatly reduced, the wear resistance of the inner ring raceway surface 14a is improved, and the rolling characteristics and life of the roller bearing 10 are improved. Can be achieved.

  Referring to FIG. 7, a roller bearing race according to another embodiment will be described. FIG. 7 shows a roller bearing provided with this race as an outer ring 12. In this embodiment, the inner surface (outer ring raceway surface) 12a of the outer ring 12 is processed to be uneven, and the soft metal 18 is buried in the recess 12c by polishing after the entire surface is plated with the soft metal 18. In the same manner as described above, when the roller 16 rolls on the outer ring raceway surface 12a, when the roller 16 crosses the soft metal 18 provided on the outer ring raceway surface 12a, foreign matter such as a carbon suit adhering to the roller 16 is obtained. Is transferred to the soft metal 18 and buried and removed.

  In the present invention, instead of knurling, a recess is formed in the member for the race ring by cutting, grinding, blasting, laser processing, etching, stamping (molding, coining), electrical discharge machining, etc. As a result, it can be processed into irregularities. Moreover, a convex part can be formed by a lapping process, a cutting process, a grinding process, an electropolishing process, etc., and can be processed into an unevenness as a result. In the case of these various processes, it is only necessary to form a recess in which the soft metal is embedded.

  The present invention relates to a cam follower of an engine valve mechanism of an automobile or the like, a planetary gear mechanism of an automatic transmission or the like of an automobile, and other mechanisms in which roller bearings are used with oil lubrication, and there is a possibility that foreign matter may be present. It can be effectively applied to.

  The present invention is not limited to the above-described embodiments, but includes various changes or modifications made within the scope of the claims.

It is sectional drawing of the roller bearing provided with the bearing ring for roller bearings concerning embodiment of this invention. It is a figure which shows the process of the manufacturing method of the bearing ring for roller bearings. It is a preparation process figure of the member for bearing rings in the manufacturing method of the bearing ring for roller bearings. It is a knurling process drawing of the member for bearing rings in the manufacturing method of the bearing ring for roller bearings. It is a plating process figure of the member for bearing rings in the manufacturing method of the bearing ring for roller bearings. It is a grinding | polishing process figure of the member for bearing rings in the manufacturing method of the bearing ring for roller bearings. It is sectional drawing of the roller bearing provided with the bearing ring for roller bearings concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Roller bearing 12 Outer ring 14 Inner ring 16 Roller 14a Inner ring raceway surface 14b Convex part 14c Concave part 18 Soft metal

Claims (3)

  In a bearing ring for a roller bearing having a raceway surface with which the roller makes rolling contact, the raceway has a convex portion after the raceway surface is processed to be uneven, and at least the uneven surface is plated with a soft metal. The bearing ring is removed, the surface of the member for the bearing ring is exposed, and the soft metal is left in the recess as a metal for removing at least foreign matter adhering to the roller. . In a method for manufacturing a roller bearing raceway having a raceway surface with which a roller makes rolling contact,
An irregularity processing step for processing the surface of the bearing ring member into irregularities;
A heat treatment process for heat treating the bearing ring member;
A plating process for plating the metal for the bearing ring with a soft metal;
Polishing step of polishing the convex part of the bearing ring member to expose the surface of the bearing ring member, and leaving the soft metal in the concave part of the bearing ring member as a metal for removing at least foreign substances adhering to the rollers; ,
A method for manufacturing a bearing ring for roller bearings, comprising: The concavo-convex processing step is a knurling process that processes the surface of the bearing ring member into a net-like concavo-convex shape, and the soft metal used in the plating process is selected from gold, silver, copper, tin, indium, zinc, and aluminum. The method for producing a bearing ring for a roller bearing according to claim 2, wherein the bearing ring is at least one kind or a base alloy thereof.

Images