Impregnated Sintered Bearing

A self-lubricating sintered bearing is a metallic component with high porosity (20-25% in volume), impregnated in a lubricant oil. The present invention relates to a Cu-based sintered bearing and a method for manufacturing a Cu-based sintered bearing. For example, in terms of the length along the shaft line , it is also possible to set the straight hole portion 4a to be longest and set the enlarged diameter portions 4b and 4c to be shorter than the straight hole portion 4a or form all of the straight hole portion 4a and the enlarged diameter portions 4b and 4c in different lengths. To determine whether a bearing that has lost more than 50% of its oil content can be recharged by adding few drops to the surface of the bearing, oil was added to a bearing which was working at 42% of the initial oil content. The technical knowledge and manufacturing expertise behind Oilite bearings have resulted in a vast array of sophisticated, high quality components that are supplied to across a wide range of industries throughout the world. 5 is a cross-sectional view of the oil-impregnated sintered bearing according to the third embodiment of the present invention along a shaft direction of a rotating shaft. Therefore, in a surface side of the core rod for shaping the bearing hole, the disposition of the Cu powder is adjusted from the lower side through the upper side of the cavity. A polyacetal lining bonded to a steel backing via a porous bronze interlayer gives a bearing material with good performance under conditions of sparse lubrication. The Cu-based sintered member 10 contains C contained in the particles 11 in an alloyed state in addition to the above-described free graphite 13. This C is derived from C contained in the raw material Cu—Ni alloy powder. 2), regarding the two enlarged diameter portions 4b and 4c present across the straight hole portion 4a, a straight line L1a extended from the inclined surface of the first enlarged diameter portion 4c in an inclination direction toward the center of the bearing main body 1 and a straight line L1b extended from the inclined bimetal bearings surface of the second enlarged diameter portion 4b located at the opposite corner relative to the inclined surface of the first enlarged diameter portion 4c in an inclination direction toward the center of the bearing main body 1 are disposed parallel to each other. 5), regarding the two enlarged diameter portions 6b and 6c present across the straight hole portion 6a, a straight line L1a extended from the inclined surface of the first enlarged diameter portion 6c in an inclination direction toward the center of the bearing main body 1 and a straight line L1b extended from the inclined surface of the second enlarged diameter portion 6b located at the opposite corner relative to the inclined surface of the first enlarged diameter portion 6c in an inclination direction toward the center of the bearing main body 1 are preferably disposed parallel to each other. To improve the lubrication conditions and reduce the friction of these bearings has been the challenge for many researchers and is still a major problem today. In addition, Sn forms a Sn high-concentration alloy layer in the Cu-based sintered member 10 on the inner surfaces of the internal pores 12a and the open pores 12b and around the openings of the open pores 12b. The area occupied by the Cu phase relative to the area of the inner circumferential surface S in the central portion 3AS of the first region 3A is preferably 80% or more and preferably 100% or less, but is not limited thereto. In the Cu-based sintered member 10, excellent wear resistance is ensured because the particles 11 constituting the substrate are Cu—Ni main phase grains. In the outer periphery of the core rod 13, there is provided a master form 13a (see FIG. In the measurement, a sliding test was carried out by rotating the rotating shaft 2 in a state in which, in the oil-impregnated sintered bearing 20 (the oil-impregnated sintered bearing 10 shown in FIG. Although fluid lubrication was reported to be possible for oil-impregnated sintered bearings especially under large sliding speed conditions 7 , the sliding area of the bearing is often under a boundary or mixed lubrication condition 6 due to the reasons mentioned above, resulting in large bearing friction. A larger range of Rollers – Solid – Shaft Mount – Coloured Urethane might be available on the Bearing Shop Online site. With or without standard sintered bronze bearings. There is also a good range of Sheet – Sintered Bronze on the Small Parts and Bearings website. An oil-impregnated sintered bearing 1 is formed in a cylindrical configuration of a porous body consisting of a sintered metal. On the bearing 10, the core rod sliding step was carried out. The company’s new ‘Self-Lubricating BEARPHITE’ bearings are designed to be used in environments unsuitable for traditional oil impregnated sintered bearings, using graphite as a ‘solid lubricant’.

These effects would yield the oil-rich and better lubrication condition leading to lower friction of the PTFE-coated shaft. Thus, in the oil-impregnated sintered bearing 1 with the crowning portions 1c of the above-mentioned configuration, it is possible to form the crowning portions 1c at the axial ends simultaneously by one sizing process. The Cu-based sintered bearing according to claim 1, wherein the content of C as free graphite existing at a grain boundary between the Cu-Ni main phase grains is 4 mass% or less. The oil contained in the porosity provides a constant lubrication between bearing and shaft, so the system does not need any additional external lubricant. We also know bronze bearings encourage capillary action, so an oily film forms quickly, pretty much as soon as a bearing spins up to speed. 1. In addition, the ratios between Fe and Cu in specimens used in the verification were approximately 50:50 in the sample 5, approximately 85:15 in the sample 6, and approximately 95:5 in the sample 7. On the samples 5 to 7, the core rod sliding step was not carried out. The oil-impregnated sintered bearing 1 is incorporated for use into a power transmission mechanism for a power window as shown, for example, in FIG. With a structure in which the rotation of the roller is supported by rolling bearings like the support structure in Fig. The PTFE-coated shaft was found to retain a larger amount of oil droplets in the bearing clearance than the noncoated shaft and make secure oil circulation in the clearance. The present invention relates to an oil-impregnated sintered bearing formed of a Fe—Cu-based sintered metal and a production method therefor. The Cu-based sintered bearing according to claim 1, wherein the C content as the total is 1% by mass or more and 3% by mass or less. Usually, contact angles could vary between receding and advancing contact angles, which is called contact angle hysteresis 22 , 23 , and the variable range depends on the liquid and surface material. Further, a high lubricating performance is obtained by the lubricating action of the free lubricating graphite 13 having high lubricity distributed in the pores 12 distributed and distributed in the Cu-based sintered member 10. In addition, the wear resistance is further improved by the lubricating oil impregnated in the pores 12 of the Cu-based sintered member 10. A preferred ratio of the area ratio of the Cu phase relative in the central portion 3BS along the shaft line of the second region 3B to the area ratio of the Cu phase relative in the central portion 3CS along the shaft line of the third region 3C in the oil-impregnated sintered bearing 10 of the first embodiment shown in FIG. In particular, seizure can be suppressed by using a bearing made of a Cu-based sintered member (Cu-based sintered bearing) for supporting a rotating shaft made of an Fe-based alloy. You might also be interested in the range of Pulleys – Blocks – Flat on the Miniature Bearings Australia site. An oil film is formed by exuding into a gap (mainly a bearing gap) between the two, and the rotation of one of the two is supported in a non-contact manner with respect to the other by the oil film. Of these, bronze-based and phosphor-bronze-based materials have low material strength in the first place and cannot be used under conditions where high surface pressure is applied. Lubricants based upon PAGs, esters, and perfluorinated aliphatic ether PFAE provide excellent performance in sintered bearings and the lubricants based on esters and PAOs perform well in high-speed spindle bearings. Hereinafter, oil-impregnated sintered bearings that are embodiments to which the present invention is applied will be described with reference to drawings. Raw material for sintered parts like slide bearings, bushed or other formed components is metal powder made of iron, bronze or other metals. In an oil-impregnated sintered bearing (hereinafter, simply regarded as the bearing) 40, a bearing hole 6 into which the rotating shaft 2 is scheduled to be inserted is provided inside the bearing main body (sintered body) 1 formed of a Fe—Cu-based sintered metal. In addition to bearings, the technology can be applied to a wide range of fields, as it can be used in composite material products with integrated resin parts, or applied to sliding materials other than bearings. The Cu-based sintered bearing according to claim 1, wherein the content of P is 0.1% by mass or more and 0.55% by mass or less. Based on powder metallurgy technology, sintered bronze bearings deliver a very familiar feature. The impregnating oil or fluid ensures permanent lubrication of the bearings. The Cu-based sintered bearing according to claim 1, wherein the porosity is 8% or more and 25% or less. There is also a good range of Rollers – Solid – Stud Mount – Black Neoprene on the Small Parts and Bearings website.

By using the Cu-based sintered member 10 having a composition in which Cu is dominant as the bearing 1, seizure with the shaft made of the Fe-based alloy is less likely to occur. The porosity of the surface is preferably set in the range of 10 to 40% from the viewpoint of ensuring proper circulation of the energized oil and a good rotation support function. 1.1 Sintered Bronze bearings are all self-lubricating and maintenance free. An enlarged photograph of the central portion 3BS along the shaft line of the second region 3B and an enlarged photograph of the central portion 3CS along the shaft line of the third region 3C in the bearing 10 shown in FIG. Since 0a2 and 50a3 are provided, the electro-sintered bearing 50 can perform centering movement (oscillation displacement in the axial direction) with respect to the shaft 51, whereby the charging roller (40) has a non-printing area ( 30a, 30b) can always be in close contact. Our team of engineers can aid your design department in the application and design of bearings and their associated components, along with sintered shapes. In addition, in Fe—Cu-based sintered bearings of the related art, the areas occupied by the Cu phase significantly differ between a portion of the cavity that was the upper side and a portion that was the lower side during shaping, and local abrasion or the like is caused when the rotating shaft is rotated at a high speed. The present invention relates to an oil-impregnated sintered bearing obtained by impregnating a porous body formed of a sintered metal with a lubricant (lubricating oil or lubricating grease). The schematic view of the shaft and bearing is shown in Figure 2 As can be considered from these oil supply mechanisms, oil amount in the bearing gap is usually smaller than fully lubricated bearings and sometimes insufficient for good lubrication. In this electrically conductive sintered bearing unit, the washer 52 is restrained from slipping off in one axial direction (leftward in FIG. Métafram sintered bearings are porous, lubricant-containing plain bearings made of bronze BP 25 or iron FP 20. The rotating shaft removes lubricating oil from the pores by means of a suction effect. To discover more about how the technology has revolutionised component production, browse our Introduction to Powder Metallurgy. Smaller friction of the PTFE-coated shaft was probably attributable to this oil-rich condition. This wear test assumes that the sintered bearing is rotated at a high speed with a high surface pressure. THN can also supply sintered iron or bronze bearings with MoS2. In the related art, in the production of an oil-impregnated sintered bearing made of a Fe—Cu-based sintered metal for which the above-described Cu-based flat raw material powder is used, a mold is installed so that a shaft direction lies in the vertical direction, and a powder mixture made up of Fe powder and Cu powder is loaded from an upper side of a cavity into which a core rod has been inserted. Furthermore, the diameter of the through hole in the sintered body is expanded up to a predetermined depth on both sides by sizing, thereby forming the bearing main body 1 including the straight hole portion 6a and the enlarged diameter portions 6b and 6c. 1 (comparative example 1), a rolling bearing in which a conductive grease is filled in a metal shaft is attached to a conductive rolling bearing ( Regarding Comparative Example 2), the current-carrying characteristics were measured under the following conditions. 3. An oil-impregnated sintered bearing as claimed in claim 1 or 2, wherein the crowning portion is formed by a tapered surface whose inclination angle ranges from 0.1 to 3 degrees. Their high permissible sliding velocities make these sintered bronze bearings ideally suited to rotating applications. 2, in the Cu-based sintered member 10, a plurality of particles (Cu—Ni main phase grains) 11 are integrated with each other through a pore 12 (internal pore 12a and open pore 12b) at the grain boundary portion. The Cu-based sintered bearing according to claim 1, wherein the content of P is 0.2% by mass or more and 0.4% by mass or less. Therefore, on the surface of the core rod 34 for shaping the bearing hole 3, the disposition of the Cu powder 42 is adjusted from the lower side through the upper side of the cavity P. NTN Corporation has announced further additions to its BEARPHITE range of sintered bearings. Mass movements that occur during sintering consist of the reduction of total porosity by repacking, followed by material transport due to evaporation and condensation from diffusion In the final stages, metal atoms move along crystal boundaries to the walls of internal pores, redistributing mass from the internal bulk of the object and smoothing pore walls. Sintered bronze rod is supplied oversized so it can be machine finished to the dimensions shown.

Oilite bearings are manufactured in three standard materials. However, the amount of oil in those sliding areas is often insufficient leading to an unsatisfactory friction. Applications that require bearings with a high level of sliding performance, including automotive electrical components such as power window and fan motors, or photocopiers or laser printers, are made of bronze materials. Per square inch is also known, made by sintering a mixture of iron powder with copper powder, the proportion of the latter being up to 25% by weight. The lower friction of the PTFE-coated shaft is attributed to the lower wettability to the impregnated oil than that of the noncoated shaft. Figure 11 shows the calculated capillary force along with ε = 1 (which denotes the contact of the shaft and the bearing), c = 6.5 μm, and the tested bearing dimensions. There is also a good range of Rollers – Solid – Stud Mount – Coloured Urethane on the Small Parts and Bearings website. In the measurement, a sliding test was carried out by rotating the rotating shaft 2 in a state in which a load was applied to a location 2 mm offset from the central portion 3AS along the shaft line of the first region 3A toward the central portion 3BS along the shaft line of the second region 3B in the oil-impregnated sintered bearing 10 shown in FIG. 1. A SINTERED BEARING CONSISTING OF AT LEAST 60% BY WEIGHT OF IRON POWDER, WITH THE REMAINDER SUBSTANTIALLY WHOLLY OF POWDERED COPPER-BASE METAL ALLOY OF MELTING POINT LOWER THAN THE MELTING POINT OF COPPER, FORMED AS A SINTERED POROUS MASS HAVING A POROSITY OF AT LEAST 20%. In both of the enlarged diameter portions 4b and 4c, an angle (taper angle) θ1 formed by an inclined surface of the enlarged diameter portion and an inner surface of the straight hole portion 4a (or the shaft line of the rotating shaft 2) parallel to the shaft direction of the bearing main body 1 is set to a random angle, for example, approximately 0.1° to 10°. Porous bearings are known which are manufactured by mixing, pressing and sintering metal powders. To fulfill our customer needs, we also offer range of product line-up including alloyed core. There is also a good range of Rollers – Solid – Shaft Mount – Coloured Urethane on the Small Parts and Bearings website. Porous iron bearings can take up higher bearing loads but have a lower permissible sliding speed. In order to overcome the disadvantage of the rotating shaft incapable of properly coming into contact with the friction surface inside the bearing in the case of receiving a load in a shear direction as described above, for example, an oil-impregnated sintered bearing including a straight hole portion having a constant diameter and an enlarged diameter portion having a diameter that increases outwards and forming a tapered shape in a bearing hole is known (for example, refer to Japanese Unexamined Patent Application, First Publication No. 2004-308682). After the completion of the radial pressing process, the core rod 13 and the upper and lower punches 14 and 15 are raised integrally, and the sintered bearing material 11 is pulled out of the die 12. As a result, the sintered bearing material 11 is released from the radial pressing force from the die 12, and, as shown in FIG. Avoid putting the bearings in contact with absorbent materials (cardboard, paper, cloth, etc.). Conventionally, bearings made of sintered members of various compositions have been employed in automobile internal combustion engines. The bearing 10 having the above-described configuration is used in a state in which, for example, the bearing main body 1 is impregnated with a lubricant and the rotating shaft 2 is inserted into the bearing hole 3. 1 is a cross-sectional view of the oil-impregnated sintered bearing according to the first embodiment of the present invention along a shaft direction of a rotating shaft. Sintered bronze bearings are characterized by being self-lubricating and maintenance-free. While in the above examples the crowning portions 1c and 2c are formed by the rounded curved surfaces 1d and 2d, it is also possible, as shown, for example, in FIGS. At this time, the vibration generated in the rotating shaft 2 causes the lubricant that lubricates the rotating shaft 2 and the straight hole portion 4a to be pushed out toward the first enlarged diameter portion 4b and the second enlarged diameter portion 4c and loaded into the space between the rotating shaft 2 and the enlarged diameter portion 4b and the space between the rotating shaft 2 and the enlarged diameter portion 4c. The lubricant loaded into the spaces between the rotating shaft 2 and the enlarged diameter portions 4b and 4c is pressurized by the vibration of the rotating shaft 2 so as to be pressed against the enlarged diameter portions 4b and 4c, but the enlarged diameter portions 4b and 4c have been provided to be dense, and thus the lubricant is not pressed into the inside of the bearing main body 1, instead, remains between the rotating shaft 2 and the enlarged diameter portions 4b and 4c, and exerts a repulsive force on the rotating shaft 2. This repulsive force suppresses the vibration of the rotating shaft 2 and prevents the misalignment of the rotating shaft 2 relative to the bearing.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to an electrically conductive sintered bearing which is made of sintered metal and has internal pores impregnated with electrically conducting oil, and an inner periphery of the electrically conductive sintered bearing. Whether a sintered bearing is metal, ceramic, or polymer-based, Krytox performance lubricants retain their viscosity and lubricating properties in high-temperature, high-pressure environments, while consistently outperforming hydrocarbon-based lubricants. This lifelong lubrication makes sintered bearings a versatile alternative to costly roller bearings. Spyraflo robust light weight aluminium housing with self aligning bronze bearings. Small Parts & Bearings products are not authorised for sale into the USA or Canada due to the reluctance of Australian insurers to provide product liability insurance into those two countries. This is attributed to a phenomenon in which the amount of the Cu powder being attached to the surface of the core rod is likely to increase as the amount of the powder mixture dropping along the surface of the core rod increases. A preferred ratio of the area occupied by the Cu phase relative to the area of the inner circumferential surface S in the central portion 3AS of the first region 3A in the oil-impregnated sintered bearing 10 of the first embodiment shown in FIG. The Cu-based sintered bearing according to claim 1, wherein the porosity is 10% or more and 25% or less. In the above-described bearing 20 of the second embodiment as well, in the inner circumferential surface S of the bearing hole 4, the area ratio of the Cu phase in a central portion 4B S along the shaft line of the enlarged diameter portion 4b formed in the second region 4B is set to 80% or more and 100% or less of the area ratio of the Cu phase in a central portion 4CS along the shaft line of the enlarged diameter portion 4c formed in the third region 4C. The area ratio of the Cu phase in the central portion 4BS along the shaft line of the enlarged diameter portion 4b formed in the second region 4B is preferably 90% or more and preferably 100% or less of the area ratio of the Cu phase in the central portion 4CS along the shaft line of the enlarged diameter portion 4c formed in the third region 4C, but is not limited thereto. Provided is a Cu-based sintered bearing comprising: 15-36 mass% of Ni; 3-13 mass% of Sn; 0.05-0.55 mass% of P; and 0.02-4 mass% C in total, the balance consisting of Cu and inevitable impurities, wherein the content of C forming an alloy with a matrix within Cu-Ni main-phase grains is 0.02-0.10 mass%. Sintered bearings are used whenever particularly low noise levels are required, loads are variable or little space is available. A production method for an oil-impregnated sintered bearing that is another aspect of the present invention has the following configuration. The samples 8 to 10 were formed by loading a powder mixture in which the mixing ratio was set to Fe-20 wt % Cu-2 wt % Sn into a cavity, sliding a core rod vertically in the cavity along the vertical direction, pressing upper and lower punches fitted into the cavity, and sintering the powder mixture. As a result, wear of the oil-impregnated sintered bearing and generation of unusual noise due to stress concentration can be suppressed, making it possible to use the oil-impregnated sintered bearing for a long period of time in a stable manner. The low wettable surface drags the oil droplets firmer than the high wettable surface, which generates the secure oil circulation in the bearing clearance for the PTFE-coated shaft. The lower punch 33 is fitted into the die 31 of the mold 30, and the core rod 34 is lowered up to the bottom of the cavity P. Next, as shown in FIG. In the bearing 20 of the present embodiment, in the inner circumferential surface S of the bearing hole 4, the area ratio of the Cu phase in the central portion 4BS of the enlarged diameter portion 4b is set to 80% or more and 100% or less of the central portion 4CS of the enlarged diameter portion 4c. Therefore, a state in which the area ratio of the Cu phase does not significantly change throughout the entire region from the enlarged diameter portion 4b through the enlarged diameter portion 4c across the straight hole portion 4a and the area ratio of the Cu phase does not significantly change is caused. A larger range of Rollers – Durasoft – Shaft Mount – Coloured Urethane might be available on the Bearing Shop Online site. The particles 11 that are Cu—Ni main phase grains are made of Cu—Ni alloy grains containing Sn, P, and C, and a plurality of particles 11 are sintered to constitute a base of the Cu-based sintered member 10. Sintering is static when a metal powder under certain external conditions may exhibit coalescence, and yet reverts to its normal behavior when such conditions are removed.

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