KR100790003B1 - Sliding bearing with oil pocket - Google Patents

Abstract

The present invention relates to an oil pocket sliding bearing, comprising: a metal base having grooves continuously formed on the sliding side; A sintered layer formed by arranging a plurality of segment sintered materials in contact with each other on the groove of the metal substrate and sintering and bonding the metal substrate and the segment sintered material and the segment sintered material to each other by sintering; And lubricating oil impregnated into the grooves of the sintered layer and the metal base. According to the present invention, the lubricating oil can be easily impregnated, and the lubricating oil can be impregnated in a large amount, and the sliding surface during the sliding motion. As lubricating oil supply can be made smoothly.

Sliding Bearing, Solid Lubricant, Sintered Material, Ferrous Metal Powder, Lubricant

Description

Oil pocket sliding bearing {SLIDING BEARING WITH OIL POCKET}

Figure 1a is a perspective view of a metal base used in the manufacture of the bush-type oil pocket sliding bearing according to the present invention.

FIG. 1B is a cross-sectional view of the metal substrate shown in FIG. 1A.

Figure 1c is a perspective view showing the metal substrate and the segment sintered material pressed into the metal substrate used in the manufacture of the bush-type oil pocket sliding bearing according to the present invention.

1D is a cross-sectional view schematically illustrating a pressure sintering joining method of the bush-type oil pocket sliding bearing using the segment sintered material according to the present invention.

FIG. 1E is a perspective view of a bush-type oil pocket sliding bearing in which sintered sintered material and segment sintered material and metal substrate are sintered together.

FIG. 1F is a cross-sectional view of the bush oil pocket sliding bearing shown in FIG. 1E. Figure 2a is a perspective view of a metal base used in the manufacture of the flat oil pocket sliding bearing according to the present invention.

FIG. 2B is a cross-sectional view of the metal substrate shown in FIG. 2A.

Figure 2c is a perspective view of a segment sintered material used for the production of flat oil pocket sliding bearing according to the present invention.

Figure 2d is a cross-sectional view showing the metal substrate and the segment sintered material pressed into the metal substrate used in the manufacture of the flat oil pocket sliding bearing according to the present invention together with the mold.

2E is a cross-sectional view schematically showing a pressure sintering joining method of the manufacturing method of the plate-type oil pocket sliding bearing using the segment sintered material according to the present invention.

2F is a perspective view of a flat oil pocket sliding bearing in which the sintered sintered material and the sintered sintered material and the metal substrate are sintered together.

             Explanation of symbols on the main parts of the drawings

1a, 1b: metal base 3a, 3b: groove

5a, 5b: lube oil inlet 7a, 7b: segment sintered material

9a, 13b: Sintered layer 11a, 11b: Lower mold

13a, 13b: side mold 15a, 15b: puncher

17: press 19: inside the sintering furnace

21: Sintering Furnace

The present invention relates to an oil pocket sliding bearing, and more particularly, an oil of a structure that can be easily impregnated with lubricating oil, can impregnate a large amount of lubricating oil, and can smoothly supply lubricating oil to a sliding surface during sliding movement. Pocket sliding bearing.

In general, sliding bearings are mechanical elements that embed solid lubricants on sliding surfaces of metal substrates or form overlay layers such as iron alloys, copper alloys, aluminum alloys, copper-lead alloys, and synthetic resin composites. Used in heavy equipment, presses, machine tools, industrial machines, etc., it is used as a support or sliding part of journals, guides, reciprocating devices, etc., and is divided into bush type (cylindrical, semi-cylindrical) and flat type according to its shape and function. In particular, the present invention relates to a sintered sliding bearing that can withstand high loads by forming a sintered layer made of metal powder and a solid lubricant on the sliding side surface of the metal substrate.

Conventionally, in order to achieve high load resistance (or high strength) and high wear resistance, iron-based metal powder (copper powder is mainly mixed with iron powder on the surface of metal base made of carbon steel or stainless steel, etc. Cold press formed by pressing or sintering material, which is a mixture of metal powder) and powder or granules of solid lubricant such as graphite, molybdenum disulfide, tungsten disulfide, etc. Many metal-based iron-based sintered sliding bearings have been introduced in which the cold press-formed product is placed in a sintering furnace and sintered at a high temperature under a gas atmosphere to form a sintered layer and to bond to a metal substrate. In addition, high load resistance and high wear resistance sliding bearings are manufactured by mixing sintered compacts by mixing the conventional iron-based metal powder and solid lubricants such as graphite to form a sintered compact through primary sintering, inserting the sintered compact into a steel pipe, and then sintering the secondary compact. have.

The sintered sliding bearings described above have an advantage of having a load resistance enough to withstand high loads, but due to the compactness of the sintered structure, there is a disadvantage in that the lubricating film is not formed because the solid lubricant is not exposed smoothly. Therefore, most sintered sliding bearings impregnate the sintered layer with lubricating oil after sintering.

However, due to the compactness of the sintered structure, the sintered sliding bearings are not easily impregnated with lubricating oil, the amount of lubricating oil to be impregnated is very small, and impregnated lubricating oil cannot be smoothly supplied to the sliding surface during the sliding motion. .

In order to improve this, a method of forming a groove for lubricating oil on the surface of the steel substrate on which the sintered layer is formed may be considered. However, forming a groove for lubricating oil on the surface of the steel substrate may not increase the impregnation amount of the lubricant sufficiently. However, there is a limitation that impregnated lubricant cannot be supplied properly to the sliding surface.

The present invention devised to solve the problems of the conventional oil-impregnated sintered sliding bearings can be easily impregnated with lubricating oil, can impregnate a large amount of lubricating oil, and can smoothly supply lubricating oil to the sliding surface during sliding movement. The object is to provide a structured oil pocket sliding bearing.

Oil pocket sliding bearing according to the present invention to achieve the above object is a metal base that is continuously formed groove (groove) on the sliding side; A sintered layer formed by arranging a plurality of segment sintered materials in contact with each other on the groove of the metal substrate and sintering and bonding the metal substrate and the segment sintered material and the segment sintered material to each other by sintering; And lubricating oil impregnated in the groove of the sintered layer and the metal base.

A feature of the present invention is that the porous critical sintered layer formed between the segment sintered materials is used not only as a storage place for lubricating oil but also as a discharge path of lubricating oil impregnated in the groove.

Hereinafter, preferred embodiments of the oil pocket sliding bearing according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 1a is a perspective view of the metal substrate used in the manufacture of the bush-type oil pocket sliding bearing according to the present invention, Figure 1b is a cross-sectional view of the metal substrate shown in Figure 1a, Figure 1c is a bush-type oil pocket sliding bearing according to the present invention Figure 1d is a perspective view showing a metal substrate used in the manufacture of the segment and the segment sintered material press-fitted therein separately, Figure 1d is a pressure sintering joining method of the manufacturing method of the bush-type oil pocket sliding bearing using the segment sintered material according to the present invention 1E is a perspective view of a bush-type oil pocket sliding bearing sintered and bonded between segment sintered materials and between a segment sintered material and a metal substrate, and FIG. 1F is a bush-type oil pocket sliding bearing shown in FIG. 1E. 2A is a perspective view of a metal substrate used in the manufacture of a flat oil pocket sliding bearing according to the present invention, and FIG. 2C shows a perspective view of a segment sintered material used in the manufacture of a flat oil pocket sliding bearing according to the present invention, and FIG. 2D shows a flat oil pocket sliding bearing according to the present invention. A cross-sectional view showing a metal substrate and a segment sintered material press-fitted therein together with a mold, and FIG. 2E schematically illustrates a pressure sintering joining method in a method of manufacturing a flat oil pocket sliding bearing using a segment sintered material according to the present invention. 2F shows a perspective view of a flat oil pocket sliding bearing in which the sintered sintered material and the sintered sintered material and the metal substrate are sintered and joined to each other.

First, referring to FIGS. 1E and 2F, the sliding bearing according to the present invention may be manufactured by a bush oil pocket sliding bearing (FIG. 1E) and a flat oil pocket sliding bearing (FIG. 2F). The bush type oil pocket sliding bearing may have a semi-cylindrical shape in addition to the cylindrical shape as shown in FIG. Since the method can be applied as it is, only the cylindrical and flat oil pocket sliding bearing will be described below.

1A and 1B or 2A and 2B, one of the features of the oil pocket sliding bearing of the present invention is that the sliding surface of the metal substrate 1a, 1b on which the sintered layer is to be formed is intermediate. Boiling grooves 3a and 3b are formed continuously. The grooves 3a and 3b have a spiral shape as shown in FIG. 1A in the case of the bush-type steel base 1a, and a winding type as shown in FIG. 2A in the case of the flat steel base 1b. Preferably, the shapes of the grooves 3a and 3b need not be limited to spiral or winding shapes, and lattice grooves or other grooves may be used. However, grooves on the steel substrate according to the present invention should be connected to each other so that the lubricating oil can flow into the entire section without clogging. Preferably, the metal bases 1a and 1b are further provided with lubricating oil inlets 5a and 5b for injecting lubricating oil into the grooves 3a and 3b after the sintered layer is formed.

1C to 1F or 2C to 2F, another feature of the present invention is to increase the lubricating oil impregnation rate and impregnation amount of the sintered layers 9a and 13b by the structure of the sintered layers 9a and 13b. In addition, the lubricating oil impregnated in the grooves 3a and 3b of the metal bases 1a and 1b described above can be smoothly supplied to the sliding surface. That is, the oil pocket sliding bearing according to the present invention sinters the small segment sintered materials 7a and 7b that will constitute a part of the entire sintered layers 9a and 13b using a sintered material mixed with an iron-based metal powder and a solid lubricant. Molding (primary sintering) is carried out, and the segment sintered materials 7a and 7b are selected as many as the size of the total sintered layers 9a and 13b to be molded and pressed into the sliding side surfaces of the metal substrates 1a and 1b. Sintering again in a state to join the respective segments sintered material (7a, 7b) and at the same time bonding each segment (1a, 1b) and the metal substrate (1a, 1b) to form a sintered layer (9a, 13b) That's another feature. By doing so, the critical sintered layers (dotted surfaces in FIGS. 1F and 2F) (sintered layers formed on the surfaces in which the respective segment sintered materials 7a and 7b are in contact) are each segmented sintered material 7a and 7b. This critical sintered layer is formed between the structures of the porous structure compared to the internal structure of the segment sintered material 7a, 7b after completion of the sintered layers 9a, 13b, and can impregnate a large amount of lubricant therein. In addition, the lubricating oil retained in the grooves 3a and 3b is formed to flow out to the sliding surface. When lubricating oil is impregnated into the sintered layers 9a and 13b, the penetration area of the lubricating oil into the sintered layers 9a and 13b becomes wider, and the impregnation rate can be greatly increased. Therefore, it is easy to impregnate the lubricating oil, it is possible not only to impregnate a large amount of lubricating oil, it is possible to obtain an oil pocket sliding bearing of the structure that the lubricating oil can be smoothly supplied to the sliding surface during the sliding movement.

As described above, the segment sintered materials 7a and 7b are sintered by mixing an iron-based metal powder and a solid lubricant. The iron-based metal powder is 10 to 50% by weight of copper powder, 0.1-30% by weight of at least one or more metal powders selected from nickel, titanium, silicon, aluminum, cobalt, chromium, manganese or tin, and the balance of iron powder to the mixer. It mixes uniformly using. The solid lubricant is one or more solid lubricants selected from graphite, molybdenum disulfide (MoS ₂ ) or tungsten disulfide (WS ₂ ), and preferably contains 0.1 wt% to 20 wt% of the iron-based metal powder. Since the segment sintered material according to the present invention is molded in a compact size, even if a relatively large amount of the solid lubricant is contained, it does not act as a sintering interference material during the sintering process.

Hereinafter, referring to FIGS. 1A to 1F, a method of manufacturing a bush-type oil pocket sliding bearing using a segment sintered material according to the present invention will be described.

1A and 1B, first of all, in order to manufacture the bush-type oil pocket sliding bearing according to the present invention, a cylindrical metal substrate 1a having an inner diameter capable of forcing the segment sintered material 7a into the inside can be pressed. Prepare. In the case of the bush-type sliding bearing, since the sintered layer 9a is formed on the inner surface of the cylindrical metal substrate 1a, the groove 3a is formed on the inner surface of the cylindrical metal substrate 1a on which the sintered layer 9a is to be formed. The groove 3a may be formed in a spiral shape as shown in FIG. 1A to form a continuous lubricating oil path, or may be formed in a lattice shape or another shape similar thereto. In addition, the cylindrical metal base 1a is preferably further provided with a lubricant oil inlet 5a connected to the groove 3a from the outside. As the material of the cylindrical metal substrate 1a, it is preferable to use a material having high strength and hardness such as carbon steel or stainless steel, which can be easily sintered with iron-based metal, and copper alloy such as copper or brass. Can also be used.

In addition, as shown in FIG. 1C, a ring-shaped segment sintered material 7a to be press-fitted into the cylindrical metal substrate 1a is prepared. After the sintered layer 9a is formed, lubricating oil and a vacuum chamber are also prepared to impregnate the sintered layer 9a and the groove 3a with lubricating oil.

The ring-shaped segment sintered material (7a) is obtained by cold pressing the sintered material in which the iron-based metal powder and the solid lubricant are mixed into a ring shape, and then sintering it in an sintering furnace, or mixing the iron-based metal powder and the solid lubricant. One sintered material can be obtained by filling a mold having a ring-shaped cavity and then sintering simultaneously with pressurization in the sintering furnace. At this time, the sintering method can be formed by any of the following methods: solid state sintering (range of sintering temperature of 600 ° C-1065 ° C), transition sintering (range of sintering temperature of 1065 ° C-1095 ° C), and liquid phase sintering (sintering temperature of 1095 ° C or more). Do. Particularly, in the case of solid phase sintering, as described above, the sintering material is filled in the mold for forming the segment sintering material, and the sintering is carried out by press molding in the sintering furnace.

Bonding between the ring-shaped segment sintered material 7a and the inner wall of the ring-shaped segment sintered material 7a and the cylindrical metal substrate 1a may be made by pressureless sintering. 1D, the ring-shaped segment sintered material 7a and the cylindrical metal substrate 1a are preferably installed in the molds 11a and 13a, and then sintered under pressure in the sintering furnace. To this end, a puncher 15a having a cylindrical lower end and a press 17a connected to the puncher 15a are further prepared. The mold is divided into a side mold 13a into which a cylindrical metal substrate 1a can be inserted, and a lower mold 11a having a core into which a ring-shaped segment sintered material 7a can be inserted. desirable.

When the ring-shaped segment sintered material 7a, the cylindrical metal substrate 1a, and the molds 11a and 13a are prepared, as shown in FIG. 1C, the ring-shaped segment is formed inside the cylindrical metal substrate 1a. The sintered material 7a is forcibly pressed using a press or the like and press-fitted as necessary.

Next, as shown in FIG. 1D, the lower mold 11a and the side mold 13a are assembled inside or outside the sintering furnace 21, and the core of the lower mold 11a is press-fitted into the cylindrical metal base 1a. The metal base 1a is inserted into the side mold 13a so as to be at the center of the ring-shaped segment sintered material 7a. When the assembly and insertion process is performed outside the sintering furnace 21, the molds 11a and 13a, the metal base 1a and the segment sintering material 7a are transferred to the inside of the sintering furnace 19.

Next, the temperature of the inside of the sintering furnace 19 is raised to 600 ° C-1100 ° C by the heater 23, and the sintered material 7a is sintered secondly, while the puncher 15a connected to the press 17 is 0.1-. Pressurized at a pressure of 200 kg / cm 2. The pore size and density of the critical sintering layer to be formed between each segment sintered material 7a are controlled by the strength of the pressurization pressure. Sintering and pressurization time is suitable for 1 to 100 minutes. In this process, each segment sintered material 7a is joined to form the whole sintered layer 9a, and also each segment sintered material 7a and the metal base material 1a are sintered together, and the sintered layer 9a and the metal base material are also joined together. (1a) becomes one. However, the critical sintered layer between each segment sintered material 7a is inferior in structure density and has many pores compared with the inside of each segment sintered material 7a. Figures 1e and 1f shows a sliding bearing having a bush-type sintered layer (9a) completed by the second sintering and pressurization at the same time. In FIG. 1F, the dotted line indicates the critical sintered layer with many pores.

The sliding bearing having the bush type sintered layer 9a thus obtained is impregnated with lubricating oil in a vacuum atmosphere to impregnate the sintering layer 9a and the groove 3a with lubricating oil. The lubricating oil also penetrates into each segment sintered material 7a, but a large amount of lubricating oil penetrates the critical sintering layer and the groove 3a. In this way, a bush oil pocket sliding bearing impregnated with a large amount of lubricating oil is completed.

Hereinafter, a method of manufacturing a flat oil pocket sliding bearing using the segment sintered material according to the present invention will be described with reference to FIGS. 2A to 2F.

First, referring to FIGS. 2C and 2D, in order to manufacture a flat oil pocket sliding bearing, a bar-shaped segment sintered material 7b is formed by using the iron-based metal powder and a solid lubricant. The sintering method is the same as the sintering method of the ring-shaped segment 7a.

Also, as shown in FIGS. 2A and 2D, a mold 11b into which the flat metal substrate 1b and the flat metal substrate 1b into which the segment sintered material 7b can be press-fitted on the surface is inserted. 13b). In the case of the flat sliding bearing, since the sintered layer 9b is formed on the surface of the flat metal substrate 1b, a groove 3b is formed on the surface of the flat metal substrate 1b on which the sintered layer 9b is to be formed. . The groove 3b may be formed in a winding shape as shown in FIG. 1A to form a continuous lubricating oil path, or may be formed in a grid shape or another shape similar thereto. In addition, it is preferable to further form a lubricating oil inlet 5b connected to the groove 3b from the outside in the flat metal substrate 1b. As the material of the flat metal substrate 1b, as in the cylindrical metal substrate 1a, a material having high strength and hardness, such as carbon steel or stainless steel, and which can be easily sintered with an iron-based metal is used. Although it is preferable, copper alloys, such as copper and brass, can also be used.

Bonding between the rod-shaped segment sintered material 7b and the surface of the rod-shaped segment sintered material 7b and the flat metal substrate 1b may be performed by pressureless sintering, as shown in FIG. 2D. Likewise, after the rod-shaped segment sintered material 7b and the flat metal substrate 1b are installed inside the molds 11b and 13b, it is preferable to sinter while pressing under the sintering furnace as shown in FIG. 2E. To this end, a puncher 15b capable of pressing the rod-shaped segment sintered material 7b from above and a press 17 connected to the puncher 15b are further prepared. The mold is capable of inserting the flat metal substrate 1b inside, and at the same time, the inner wall to press-fit the rod-shaped segment sintered material 7b to the flat metal substrate 1b by the required number. It is preferable to separate this open side mold 13b and the lower mold 11b on which the flat metal base material 1b can be placed.

When the rod-shaped segment sintered material 7b, the flat metal substrate 1b and the molds 11b and 13b are prepared, as shown in FIG. 2D, the flat metal substrate 1b is formed into the mold 11b, 13b), the rod-shaped segment sintered material 7b is press-fitted between the inner walls of the side mold 13b as many times as necessary, and each segment sintered material 7b, each segment sintered material 7b, and a flat plate type is pressed. The metal substrate 1b of the close contact is made.

Next, as shown in FIG. 2E, the molds 11b and 13b, the metal substrate 1b and the segment sintered material 7b are transferred to the inside of the sintering furnace 19.

Next, the sintering material 7b is sintered secondly by raising the temperature of the inside of the sintering furnace 19 to 600 ° C.-1100 ° C. by the heater 23, and 0.1-s by the puncher 15b connected to the press 17. Pressurized at a pressure of 200 kg / cm 2. The pore size and density of the critical sintering layer to be formed between each segment sintered material 7b are controlled by the strength of the pressurization pressure. Sintering and pressurization time is suitable for 1 to 100 minutes. In this process, each segment sintered material 7b is joined to form the whole sintered layer 9b, and also each segment sintered material 7b and the metal base material 1b are sintered together, and the sintered layer 9b and the metal base material are also sintered together. (1b) is integrated. However, the critical sintered layer between each segment sintered material 7b has a lower structure density and many pores than the inside of each segment sintered material 7b. Figure 1f shows a sliding bearing having a flat plate-like sintered layer (9b) completed by the second sintering and pressurization at the same time. In FIG. 2F, the dotted line indicates the critical sintered layer with many pores.

The sliding bearing having the flat sintered layer 9b thus obtained is impregnated with lubricating oil in a vacuum atmosphere to impregnate the sintering layer 9b and groove 3b with lubricating oil. The lubricating oil also penetrates into each segment sintered material 7b, but a large amount of lubricating oil penetrates the critical sintering layer and the groove 3b. In this way, a flat oil pocket sliding bearing impregnated with a large amount of lubricating oil is completed.

According to the present invention having the above-described configuration, the lubricating oil can be easily impregnated, the lubricating oil can be impregnated in large quantities, and the lubricating oil can be smoothly supplied to the sliding surface during the sliding motion.

Although the present invention has been described with reference to the embodiments shown in the accompanying drawings, the scope of protection of the present invention is not intended to be limited thereto, and the scope of protection of the present invention is set forth in the detailed description of the claims and all equivalent embodiments thereof. It should be interpreted as crazy.

Claims (4)

A metal substrate on which a groove is continuously formed on the sliding side; A sintered layer formed by arranging a plurality of segment sintered materials in contact with each other on the groove of the metal substrate and sintering and bonding the metal substrate and the segment sintered material and the segment sintered material to each other by sintering; And Oil pocket sliding bearing comprising a; lubricating oil impregnated in the sintered layer and the groove of the metal base. The method of claim 1, The segment sintered material is sintered by mixing the iron-based metal powder and the solid lubricant in the ratio of 99.9: 0.1-1.80: 20% by weight, the iron-based metal powder is 10-50% by weight of copper powder, nickel, titanium, silicon 0.1-30% by weight of one or more metal powders selected from among aluminum, cobalt, chromium, manganese or tin, and the remainder is iron powder, and the solid lubricant is graphite, molybdenum disulfide (MoS ₂ ) or tungsten disulfide (WS). ₂ ) Oil pocket sliding bearing, characterized in that at least one solid lubricant selected from among. The method according to claim 1 or 2, The metal substrate and the sintered layer is oil pocket sliding bearing, characterized in that the flat. The method according to claim 1 or 2, The metal substrate and the sintered layer is oil pocket sliding bearing, characterized in that the bush type.

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