WO2011145693A1 - 転がり軸受及びその製造方法 - Google Patents
転がり軸受及びその製造方法 Download PDFInfo
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- WO2011145693A1 WO2011145693A1 PCT/JP2011/061562 JP2011061562W WO2011145693A1 WO 2011145693 A1 WO2011145693 A1 WO 2011145693A1 JP 2011061562 W JP2011061562 W JP 2011061562W WO 2011145693 A1 WO2011145693 A1 WO 2011145693A1
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- WIPO (PCT)
- Prior art keywords
- rolling
- rolling element
- cage
- rolling bearing
- injection molding
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/05—Making machine elements cages for bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K25/00—Uniting components to form integral members, e.g. turbine wheels and shafts, caulks with inserts, with or without shaping of the components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/4617—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages
- F16C33/4623—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
- F16C33/4629—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from metal, e.g. cast or machined window cages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/467—Details of individual pockets, e.g. shape or roller retaining means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/467—Details of individual pockets, e.g. shape or roller retaining means
- F16C33/4676—Details of individual pockets, e.g. shape or roller retaining means of the stays separating adjacent cage pockets, e.g. guide means for the bearing-surface of the rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/56—Selection of substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2220/00—Shaping
- F16C2220/20—Shaping by sintering pulverised material, e.g. powder metallurgy
Definitions
- the present invention relates to a rolling bearing and a method for manufacturing the same, specifically, a cage constituting the rolling bearing is integrally formed by metal injection molding, more specifically, metal powder injection molding, and a rolling element drop-off preventing structure is provided.
- the present invention relates to a rolling bearing provided and a manufacturing method thereof.
- Rolling bearings are indispensable parts for machines with rotation, and play a role in smoothly transmitting power with as little friction as possible. For this reason, rolling bearings have been suitably used for rotating parts of various machines. Even now, rolling bearings are used in various parts such as automobiles, home appliances, and OA equipment.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-82498
- the cage is formed of sintered metal by metal injection molding (MIM).
- MIM metal injection molding
- Patent Document 1 discloses an outer joint member in which a plurality of guide grooves are formed on the inner diameter surface, an inner joint member in which a plurality of guide grooves are formed on the outer diameter surface, a guide groove of the outer joint member, and this A torque transmission ball disposed on each of a plurality of ball tracks formed by a guide groove of an inner joint member facing the inner side, and a cage formed with a plurality of window-shaped pockets for receiving and holding the torque transmission balls, respectively.
- a constant velocity universal joint in which the cage is formed by mold forming (metal injection molding) including a pocket has been proposed.
- the cage provided in the constant velocity universal joint disclosed in Patent Document 1 is formed of sintered metal by metal injection molding that directly manufactures a metal part in a shape close to the shape of the final part. Can be formed.
- metal injection molding in order to obtain a product with a so-called undercut shape at the same time, the mold becomes complicated, and the manufacturing cost is greatly increased due to frequent maintenance of the mold. It's not realistic.
- the undercut shape means a shape in which the side surface of the molded product has a concave shape, and the molded product cannot be released from the mold as it is.
- Patent Document 2 discloses a synthetic resin cage for roller bearings. It is disclosed. Specifically, in Patent Document 2, a plurality of pockets for accommodating rollers are formed at predetermined intervals along the circumferential direction, and stretched on the pocket side on the inner peripheral edge or the outer peripheral edge of the column portion between the pockets. In a synthetic resin cage for a roller bearing that forms a roller stopper, a roller in which a concave groove for elastically deforming the roller stopper in the circumferential direction is formed on the entire circumference of the base of the roller stopper. A synthetic resin cage for a bearing is disclosed.
- the synthetic resin cage of the cited document 2 makes it easy to elastically deform the roller stopper part in the circumferential direction by the concave groove of the base part of the roller stopper part by utilizing the property of a general resin having both elasticity and viscosity. It has a structure that can. And the cage of cited document 2 made it possible to prevent the base of the roller stopper from being broken when the mold for molding the pocket was released in the outer peripheral direction of the cage in injection molding. It is. That is, in the synthetic resin cage of the cited document 2, the undercut shape is simultaneously formed in the injection molding.
- the synthetic resin cage of the cited document 2 is capable of forming an undercut shape at the same time in the injection molding because of the material characteristics of the resin, and is applied to a metal cage having high rigidity. I can't. Considering the difference in material characteristics between resin and metal, synthetic resin cages are inferior to metal cages in strength, rigidity, and heat resistance, and have a high coefficient of thermal expansion. However, it cannot be used in, for example, an internal combustion engine as a use part that requires these characteristics.
- the belt-shaped plate material has been press-molded to retain the cage.
- the one formed by punching a pocket hole that accommodates the rolling elements, cutting the strip-shaped plate material into a predetermined length, bending it into an annular shape, and welding both ends is often used. It was.
- the cage formed by utilizing welding has the merit that the production efficiency can be increased and the cost can be reduced even when compared with the cage formed only by pressing or cutting. .
- the pocket hole that accommodates the rolling element has a tapered shape whose inner diameter side becomes narrower when the belt-like member is bent into an annular shape. In some cases, it is difficult to stably hold the rolling elements.
- Patent Document 3 Japanese Patent Laid-Open No. 2000-274439
- welding that can secure a sufficient amount of lubricating oil and can suppress roller skew (tilt) even when the cage swings in the radial direction.
- a cage is disclosed. That is, Patent Document 3 discloses a so-called needle roller bearing among the types of rolling bearings.
- Patent Document 3 in a welded cage in which both ends of a ring-shaped belt-like base material having a plurality of pocket holes for accommodating rollers (rolling elements) are welded, the pocket holes are guided in the circumferential direction.
- a welding retainer having a surface and a circumferential roller retaining surface, wherein the circumferential guide surface and the circumferential roller retaining surface are substantially parallel to a normal surface in a circumferential central portion of the pocket hole. Proposed.
- Patent Document 4 Japanese Patent Laid-Open No. 2002-106575
- a radial roller bearing having a roller diameter / PCD (pitch circle diameter) exceeding 0.12 the roller is prevented from dropping out in the radial direction.
- a radial roller bearing retainer is disclosed that can be prevented and that is less likely to break when the roller is assembled into a pocket. That is, Patent Document 4 discloses a so-called needle roller bearing among types of rolling bearings.
- the convex holders provided on the radially outer sides of both ends of the columns of the cage are subjected to plastic deformation. It is formed in a direction along the curved surface of the roller, and the total of the parts to be plastically deformed is 30% or more of the width of the column.
- the welded cage of Patent Document 3 is formed by welding the end portions of the strip-shaped steel materials by welding as in the prior art, but in the case of a forming method using welding, the amount of swell of beads by welding Therefore, it is difficult to form a shape with high accuracy, and facilities and processes for welding work must be provided. Therefore, the welding cage of Patent Document 3 cannot sufficiently meet the demand for cost reduction from the market.
- the cage of Patent Document 4 In the case of the cage of Patent Document 4, a step of punching a flat plate member to form a column, a step of bending the flat plate member into an annular shape, both ends of the flat plate member by welding or the like It was necessary to go through many steps before commercialization, such as the step of bonding and the step of plastically deforming the convex holding portion to hold the rollers. Therefore, the cage of Patent Document 4 has a large variation in the shape of the cage, resulting in a decrease in product quality, and has not been able to sufficiently meet the cost reduction demand from the market.
- the present invention has been made in view of the above problems and stably holds rolling elements without deteriorating the performance as a bearing while having excellent strength, rigidity, heat resistance, and dimensional accuracy.
- An object of the present invention is to provide a rolling bearing capable of reducing the manufacturing cost and a manufacturing method thereof.
- the rolling bearing according to the present invention is a rolling bearing using a retainer having a plurality of pockets for accommodating rolling elements at a predetermined interval in the circumferential direction of the peripheral wall of the cylindrical member, and the holding
- the container is integrally formed by metal powder injection molding, and is provided with a rolling element fall-off preventing structure in the rolling element accommodation area provided in the pocket.
- the rolling element falling prevention structure may be formed by subjecting an outer edge portion of the housing region to compression plastic working from the outer peripheral surface of the cage toward the radial center. preferable.
- the rolling element fall-off preventing structure is formed by subjecting a protruding portion protruding radially outward from an outer peripheral surface of the cage to plastic bending. .
- the rolling element dropping prevention structure is configured to lock the rolling element by a rolling element locking portion protruding from the cage, and the rolling element locking portion is
- the cage has a pocket connected to the inner peripheral surface side and the outer peripheral surface side of the peripheral wall respectively from the retainer, and includes a rotating shaft of the rolling element and an axis of the retainer.
- the rolling element locking portions are arranged in pairs so as to be substantially plane-symmetric with respect to the surface, and the rolling element locking portions are formed so as to protrude toward each other in a pair with respect to the axis of the rolling element. It is preferable that
- the rolling element locking portion is formed by subjecting the rolling element to plastic working after the rolling element is accommodated in the pocket of the cage.
- the rolling element locking portion is preferably formed by subjecting the cage to plastic working before accommodating the rolling element in the pocket of the cage. .
- the rolling element is preferably a needle roller.
- the rolling bearing manufacturing method according to the present invention is characterized in that the rolling element fall-off preventing structure provided in the cage uses a slide type for its formation. .
- the rolling bearing according to the present invention is such that the cage constituting the rolling bearing is integrally formed by metal injection molding, particularly metal powder injection molding, and has a rolling element fall-off preventing structure.
- the performance as a bearing can be improved, and the manufacturing cost can be reduced by reducing the number of steps required for manufacturing the rolling bearing. It is possible to provide a rolling bearing with high quality and excellent cost performance.
- the manufacturing method of the rolling bearing according to the present invention uses a slide type for forming the rolling element falling prevention structure of the rolling bearing. Therefore, according to the manufacturing method of the present invention, it is possible to form the shape with high accuracy because the punched surface does not return and sag when the conventional manufacturing method by press punching is adopted. .
- FIG. 1 It is a perspective view in one embodiment of a rolling bearing concerning the present invention. It is principal part sectional drawing for demonstrating the shape and formation process of the rolling-element fall-off prevention structure of this invention in the rolling bearing shown in FIG. It is a perspective view in another embodiment of the rolling bearing which concerns on this invention. It is principal part sectional drawing for demonstrating the shape and formation process of the rolling-element fall-off prevention structure of this invention in the rolling bearing shown in FIG. In another embodiment of the rolling bearing which concerns on this invention, it is a perspective view which shows a different form from FIG. It is principal part sectional drawing for demonstrating the shape and formation process of the rolling-element fall-off prevention structure of this invention in the rolling bearing shown in FIG.
- the rolling bearing according to the present invention uses a cage having a plurality of pockets for accommodating rolling elements as rolling elements at a predetermined interval in the circumferential direction of the peripheral wall of the cylindrical member.
- the retainer is integrally formed by metal powder injection molding, and is provided with a rolling element fall-off prevention structure in the accommodation area of the rolling element provided in the pocket.
- FIG. 1 is a perspective view of an embodiment of a rolling bearing according to the present invention.
- FIG. 1 illustrates a so-called needle roller bearing among the types of rolling bearings.
- retainer 2 illustrated in FIG. 1 shows the form before providing a rolling-element drop-off prevention structure.
- a rolling bearing (needle roller bearing) 1 includes a needle roller bearing cage 2 and rolling elements (needle rollers) 6, and a peripheral wall 3 of a cylindrical member of the cage 2. Are provided with pockets 4 for accommodating rolling elements (needle rollers) 6 which are rolling elements. That is, the needle roller bearing 1 illustrated in FIG.
- the rolling bearing 1 as a form of the rolling bearing according to the present invention is a so-called needle roller with cage and cage assemblies among the types of needle roller bearings (Needle roller bearings). ).
- Demand for the needle roller bearing 1 is increasing as an important part of an automatic transmission (AT) and an engine, particularly in an automobile.
- the cage constituting the rolling bearing according to the present invention is integrally formed by metal injection molding, particularly metal powder injection molding.
- the cage can be provided with a rolling bearing cage having a more precise shape than that of a conventional press-processed product by adopting a metal powder injection molding technique. The reason is described below.
- Metal injection molding is a technology for directly manufacturing metal parts in a shape close to the shape of the final part. “Method using metal lump as raw material” and “Method using metal powder as raw material” It is divided into.
- the former is a technique for forming a metal lump by flowing it into a mold in a molten or semi-molten state.
- the latter is called a metal powder injection molding technique, in which a metal powder is mixed and kneaded with resin, wax, etc. (binder: binder). Adopted the technology to blow into the inside.
- a metal powder and an organic binder or the like mixed and kneaded are injected into a mold.
- a screw method an in-line screw method (hereinafter referred to as a screw method).
- This screw system is a mixture of molten resin and metal powder that is mixed and kneaded with metal powder and an organic binder, heated near the resin melting temperature and melted (plasticized), and continuously rotated.
- the mixture is filled into a cylinder of an injection molding machine by retreating a screw, and then the mixture is brought into a high pressure state by a forward movement behavior of the screw, and the mixture is injected into a mold at a high speed.
- the molded product obtained by cooling and solidifying the mixture of the molten resin injected into the mold and the metal powder is further degreased (binder removal) and sintered to obtain a product.
- the features of the metal powder injection molding technology are (1) high degree of freedom of shape, (2) high degree of freedom of material, (3) high dimensional accuracy, (4) high mechanical strength, (5 ) Various post-processing is possible, (6) suitable for mass production, (7) excellent cost merit, etc. These features are described below.
- the above-mentioned feature (1) is a merit obtained from the characteristic that the metal powder injection molding technology can form a shape extremely close to the required product shape stably and integrally. Therefore, according to the metal powder injection molding technique, the number of parts can be reduced, and post-processing can be omitted.
- the metal powder injection molding technique is a resource-saving manufacturing method because the material yield is nearly 100% because runners and sprues other than products generated during injection molding can be crushed and reused. Therefore, according to the metal powder injection molding technique, the material cost can be suppressed as compared with the conventional manufacturing method.
- the feature of (2) described above is a merit obtained from the characteristic that in the metal powder injection molding technology, as a general rule, if the metal powder is made finer, it can be made into parts. Therefore, according to the metal powder injection molding technology, it can be particularly effective for making difficult-to-work material parts and commercializing refractory metals.
- the feature of (3) described above is a merit obtained from the characteristic that, in the metal powder injection molding technology, the dimensional shape of the product can obtain a high accuracy equal to or higher than that of the powder metallurgy method by ordinary press molding.
- the metal powder injection molding technique can obtain a product with a more accurate dimension and shape by improving the process.
- the feature of (4) described above is that metal powder injection molding technology uses fine powder with good sinterability and injection molding makes the filling density and pressure distribution during molding uniform, and removes binder and firing. This is a merit obtained from the property that the sintering can be performed at a relatively low temperature and at the same time, uniform high-density sintering is possible. Therefore, according to the metal powder injection molding technique, a product having a high density (relative density of 95% or more) and high strength can be obtained as compared with the case of using the powder metallurgy method by the usual press molding.
- the feature (5) described above is a merit obtained from the characteristic that the surface treatment by plating and the like can be performed in the same manner as in the case of the melted material in the metal powder injection molding technique. Therefore, according to the metal powder injection molding technique, it is possible to relatively freely perform surface modification in accordance with required characteristics.
- the feature (6) described above is a merit obtained from the characteristic that metal powder injection molding technology can be continuously manufactured by injection molding using a mold. Therefore, according to the metal powder injection molding technique, productivity is high and mass production is possible.
- the feature (7) described above is a merit obtained from the characteristic that the metal powder injection molding technology can be obtained directly by forming a shape very close to the shape of the final product with a mold. Therefore, according to the metal powder injection molding technique, the manufacturing cost can be greatly reduced. As a result, even if a separate process such as combining components by joining at a cost equivalent to the reduction of the manufacturing cost is provided, the product cost performance is good.
- the rolling element falling prevention structure provided in the cage of the present invention the pocket of the cage has a so-called undercut shape in order to reliably prevent the rolling element from falling off. That is, the rolling bearing according to the present invention is formed integrally by adopting a metal injection molding technique for the cage, and the pocket of the cage has an undercut shape.
- the rolling element fall-off preventing structure is formed by subjecting the outer edge portion of the rolling element accommodation region to compression plastic working from the outer peripheral surface of the cage toward the radial center.
- the compression plastic working is a process of plastically deforming the cage by applying a compressive force in a direction substantially perpendicular to the outer peripheral surface of the cage.
- FIG. 2 is a cross-sectional view of an essential part for explaining the shape and forming process of the rolling element fall-off preventing structure of the present invention in the rolling bearing shown in FIG.
- the upper side of FIG. 2 shows a cross-sectional view of the main part before the rolling element drop-off preventing structure provided in the cage of the present invention has an undercut shape
- the lower side of FIG. 2 shows the holding of the present invention.
- the principal part sectional drawing after the rolling-element fall-off prevention structure with which a vessel is equipped has an undercut shape is shown. As described above, FIG.
- the rolling element falling prevention structure provided in the cage 2 of the present invention has a substantially triangular cross section with an acute angle from the outer peripheral surface in the vicinity of the pocket 4 of the cage 2 toward the radial center. It can be formed by applying compression plastic working to bite the tip portion of the formed shape.
- the rolling bearing according to the present invention is preferably formed by subjecting a rolling element drop prevention structure to plastic protrusion processing on a protruding portion projecting radially outward from the outer peripheral surface of the cage.
- the plastic bending process is a process in which a bending deformation is imparted to the protruding portion to cause a plastic deformation at a predetermined angle.
- FIG. 3 is a perspective view of another embodiment of the rolling bearing according to the present invention.
- FIG. 3 illustrates a so-called needle roller bearing among the types of rolling bearings, as in FIG.
- retainer 12 illustrated in FIG. 3 shows the form before providing a rolling-element fall-off prevention structure.
- the rolling bearing (needle roller bearing) 11 includes a needle roller bearing cage 12 and a rolling element (needle roller) 16, and the peripheral wall 13 of the cylindrical member of the cage 12. Are provided with pockets 14 for accommodating rolling elements (needle rollers) 16 which are rolling elements.
- FIG. 4 is a cross-sectional view of the main part for explaining the shape and forming process of the rolling element fall-off preventing structure of the present invention in the rolling bearing shown in FIG.
- the protruding portion 15c protruding radially outward from the outer peripheral surface of the cage 12 of the present invention is subjected to plastic bending, and the pocket 14 is provided with a rolling element falling prevention structure having an undercut shape. The process is illustrated.
- the rolling element falling prevention structure included in the cage 12 of the present invention is provided on the protruding portion 15 c that protrudes radially outward from the outer peripheral surface in the vicinity of the pocket 14 of the cage 12. It can be formed by plastic bending.
- FIGS. 3 and 4 show a different form from the rolling bearing 1 shown in FIGS. 1 and 2 as another embodiment.
- another embodiment of the rolling bearing according to the present invention is shown in FIGS. It is not limited to the form shown in FIG.
- the protruding portion 15c protruding outward in the radial direction from the outer peripheral surface of the cage 12 can have a shape different from the shape shown in FIGS.
- FIG. 5 is a perspective view showing a form different from FIG. 3 in another embodiment of the rolling bearing according to the present invention.
- FIG. 6 is a cross-sectional view of the main part for explaining the shape and forming process of the rolling element fall-off preventing structure of the present invention in the rolling bearing shown in FIG.
- the rolling bearing shown in FIGS. 3 and 4 and the rolling bearing shown in FIGS. 5 and 6 particularly have the shape (thickness) of the protruding portion 15 c protruding radially outward from the outer peripheral surface of the cage 12. ) Is different.
- the rolling bearing according to the present invention can make the shape of the protruding portion 15c suitable for the material and application of the cage 12. Since the rolling bearing 11 shown in FIGS. 5 and 6 has the same basic form as the rolling bearing shown in FIGS. 3 and 4 except for the shape of the protruding portion 15c, the description thereof is omitted.
- the rolling element falling prevention structure is configured to lock the rolling element by a rolling element locking portion that protrudes from the cage.
- the rolling element locking portion is arranged to be connected to the inner peripheral surface side and the outer peripheral surface side of the peripheral wall from the cage in the pocket of the cage, and the rotating shaft of the rolling element and the The opposing direction in which the rolling element locking portions are arranged in pairs with respect to the plane including the axis of the cage, and the rolling element locking portions are paired with each other across the axis of the rolling element It is preferable that it is formed to protrude toward the surface.
- the rolling element locking portion is formed so that the pocket of the retainer has an undercut shape after the retainer of the present invention is molded by metal injection molding.
- the rolling element locking portion 15 b is formed by performing compression plastic working from the outer peripheral surface in the vicinity of the pocket 4 of the cage 2 toward the center in the radial direction. Is formed.
- a protruding portion 15 c protruding radially outward from the outer peripheral surface in the vicinity of the pocket 4 of the cage 12.
- locking part 15b is formed by giving a plastic bending process.
- the cages 2 and 12 of the present invention include rolling body locking portions 5 b and 15 b formed on the outer peripheral surface side of the peripheral walls 3 and 13, and the peripheral walls 3 and 13.
- the rolling elements 6 and 16 are prevented from falling off by connecting and disposing the rolling element locking portions 5a and 15a also on the inner peripheral surface side.
- the rolling element locking portions 5a, 5b, 15a, and 15b are located with respect to the plane that includes the rotating shafts of the rolling elements 6 and 16 and the axial centers of the cages 2 and 12. Thus, they are arranged in pairs at substantially symmetrical positions.
- the rolling element locking portions 5a, 5b, 15a, and 15b that protrude from the cage are provided for the rolling elements 6 and 16 accommodated in the cages 2 and 12, respectively.
- a so-called undercut shape can be formed by projecting in the direction of the mating pair that forms a pair with each other across the shaft.
- the rolling element locking portions 5a, 5b, 15a, and 15b are paired with each other with the axis of the rolling elements 6 and 16 therebetween. By projecting toward the other side, the rolling elements 6 and 16 are reliably prevented from falling off. Moreover, since the rolling element latching
- the durability (strength) of the cages 2 and 12 can be improved as compared with a cage retrofitted by processing.
- the rolling element falling prevention structure provided in the cages 2 and 12 of the present invention has been described with reference to FIGS. 1 to 6.
- the rolling element locking portions 5a, 5b, and 15a that form the rolling element fall prevention structure have been described.
- 15b are not limited to the numbers and arrangement positions shown in these drawings. That is, the number and arrangement position of the rolling element locking portions 5a, 5b, 15a, and 15b formed in the cages 2 and 12 of the present invention can be arbitrarily set according to the use of the rolling bearings 1 and 11. it can.
- the cages 2 and 12 of the present invention are protruded in the direction of the mating pair that forms a pair with each other across the axis of the rolling elements 6 and 16 in the formation of the rolling element locking portions 5b and 15b.
- the pockets 4 and 14 of the cage have a so-called undercut shape and are provided with a rolling element fall-off preventing structure. That is, the rolling bearings 1 and 11 according to the present invention have so-called undercuts in the shape of the inner surfaces of the pockets 4 and 14 that accommodate the rolling elements by a minimum secondary process after the cages 2 and 12 are formed by metal injection molding.
- a rolling element falling prevention structure having a shape is provided.
- the rolling element locking portion 15b shown in FIGS. 3 to 6 is formed by the mating die when the pocket 14 is formed by the above-described slide die, so that the production efficiency and cost can be reduced. It is preferable when trying.
- baskets 2 and 12 of this invention may process a grinding
- the retainers 2 and 12 can further improve the smoothness of the inner surfaces of the pockets 4 and 14 by performing processing such as polishing on the inner surfaces of the pockets 4 and 14 and are accommodated in the retainers.
- the frictional resistance between the rolling elements 6 and 16 can be further reduced.
- the rolling element locking portions 5b and 15b formed in the cages 2 and 12 constituting the rolling bearing are the rolling elements 6 and 16 in the pockets 4 and 14 of the cage. It is also preferable that the cages 2 and 12 are formed by plastic processing after being accommodated in the cage.
- the rolling bearings 1 and 11 according to the present invention after the rolling elements 6 and 16 are accommodated in the pockets 4 and 14 of the cages 2 and 12 constituting the rolling bearing, the cages 2 and 12 are processed.
- the rolling bearings 1 and 11 according to the present invention are rolling bearings having a structure that prevents the rolling elements 6 and 16 from falling off at low cost.
- the rolling bearings 1 and 11 include rolling element locking portions 5b and 15b formed in the cages 2 and 12 constituting the rolling bearing, and the rolling elements 6 and 16 in the pockets 4 of the cage. , 14 is preferably formed by subjecting the cages 2 and 12 to plastic working.
- the rolling element locking portions are provided. It is not limited to what forms 5b and 15b.
- the cages 2 and 12 are plastically deformed to form the rolling element locking portions 5b and 15b. In some rare cases, scratches or the like may occur in the rolling elements 6 and 16 depending on the equipment to be used and the manufacturing conditions to be set.
- the rolling bearings 1 and 11 according to the present invention are premised on adopting a metal powder injection molding technique in the production thereof.
- the rolling-element fall-off prevention structure of the rolling bearings 1 and 11 according to the present invention applies the minimum plastic working to the cages 2 and 12, and the rolling-element locking portions 5b and 15b are attached to the cages 2 and 12, respectively.
- a so-called undercut shape is provided by projecting the rolling elements 6 and 16 to be accommodated so as to protrude toward each other in pairs.
- the cages 2 and 12 constituting the rolling bearings 1 and 11 according to the present invention are formed by a metal powder injection molding technique, so that they are compared with conventional cages that are manufactured by processing a belt-like member.
- the cages 2 and 12 of the present invention the number of machining steps can be reduced and the shape of the product can be reduced because the cage can be simultaneously processed during the molding of the cage as compared with the conventional cage. High accuracy can be obtained stably and the yield can be improved. As a result, the costs associated with the introduction of equipment when adopting the metal powder injection molding technology can be recovered in a short period of time by shifting to mass production of products.
- the design requirements for the rolling bearing include (a) long life, (b) low torque, and (c) excellent high-speed rotation.
- Rolling bearings reduce the frequency of replacement work due to their long life, reduce the amount of heat generated and energy used for rotation because of low torque, and contribute to improving machine performance by being excellent in high-speed rotation. be able to.
- the rolling bearings 1 and 11 according to the present invention can form the cage with a highly accurate dimension and shape, the rolling bearings 1 and 11 have advantages such as low starting resistance, low power loss, and low wear. The above design requirements can be met.
- the rolling bearings 1 and 11 can arrange the pockets 4 and 14 with a high precision and a certain distance from each other in a well-balanced manner, the contact pressure of the rolling bearing with respect to the mating contact member is made uniform, The frictional resistance can be reduced as much as possible.
- the rolling elements 6 and 16 are preferably needle rollers.
- the so-called needle roller bearings in which the rolling elements 6 and 16 are needle rollers have a large load capacity due to the small difference in diameter between the inner ring and the outer ring, and are compared with slide bearings of the same size (for example, so-called ball bearings in which the rolling elements are balls).
- a so-called needle roller bearing can be downsized for the entire machine and can be suitably used for an internal combustion engine or the like because it is a machine element part that can withstand high loads.
- Manufacturing form of rolling bearing according to the present invention is based on the structure in which the rolling element falling prevention structure provided in the cages 2 and 12 constituting the rolling bearing has a slide type. It is used.
- the pockets 4 and 14 formed in the cages 2 and 12 of the present invention are formed by extracting a mold (slide mold) called a blade in an injection mold in the metal injection molding technique before taking out the product.
- a mold silica mold
- the Rukoto it is possible to obtain an undercut shaped molded product by sliding the slide core in conjunction with the opening / closing operation of the mold.
- the rolling element drop prevention structure provided in the cages 2 and 12 of the present invention finally forms an undercut shape simultaneously in a sizing process for ensuring accuracy after sintering. That is, the cages 2 and 12 shown in FIGS. 1 to 6 are formed in an undercut shape in the pockets 4 and 14 by applying a minimum secondary process to the rolling element locking portions 5b and 15b on the outer peripheral surface side. Is provided.
- the manufacturing method of the rolling bearing according to the present invention can reduce the number of processing steps compared to the press punching process by adopting the slide die, and the punching surface generated by the press punching process can be reduced. Since no return and nobody can be eliminated, the shape can be formed with high accuracy. As a result, according to the rolling bearing manufacturing method according to the present invention, the product yield can be improved and the manufacturing cost can be reduced as compared with the case where the conventional manufacturing method by press punching is employed. Further, when the rolling elements 6 and 16 of the present invention are needle rollers, it can be suitably used for machine parts in a wide range of fields by taking advantage of the features of both metal powder injection molding technology and so-called needle roller bearings. .
- a cage which comprises the said rolling bearing is formed integrally by metal injection molding, especially metal powder injection molding, and is provided with a rolling element drop-off prevention structure, As a result, the performance can be improved. Moreover, according to the method for manufacturing a rolling bearing according to the present invention, the number of steps required for manufacturing the rolling bearing can be reduced to reduce the manufacturing cost, and a high-quality rolling bearing can be provided.
- the rolling bearing was shown by the radial bearing, the rolling bearing which concerns on this invention is not limited to this, For example, a thrust type rolling bearing may be sufficient.
- the rolling bearing according to the present invention has a high degree of freedom of materials that can be selected, is low cost and high quality, and can be used in any environment, and is suitable for various parts such as automobiles, home appliances, and OA equipment. It becomes possible to use for.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Rolling Contact Bearings (AREA)
- Forging (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
2、12 保持器
3、13 周壁
4、14 ポケット
5a、15a 転動体係止部(周壁内周面側)
5b、15b 転動体係止部(周壁外周面側)
6、16 転動体
Claims (8)
- 円筒形状部材の周壁の周方向に転動体を収容して保持するポケットを所定の間隔で複数有する保持器を用いた転がり軸受であって、
当該保持器は、金属粉末射出成形により一体的に形成され、
当該保持器は、当該転動体の収容領域を備え、当該収容領域に転動体脱落防止構造を備えたことを特徴とする転がり軸受。 - 前記転動体脱落防止構造は、前記保持器の外周面から径方向中心に向けて前記収容領域の外縁部に圧縮塑性加工を施して形成したものである請求項1に記載の転がり軸受。
- 前記転動体脱落防止構造は、前記保持器の外周面から径方向外方に向けて突出した突起部分に塑性曲げ加工を施して形成したものである請求項1に記載の転がり軸受。
- 前記転動体脱落防止構造は、前記保持器に突設される転動体係止部により前記転動体を係止するものであり、
当該転動体係止部は、当該保持器が有するポケットにおいて前記周壁の内周面側と外周面側とのそれぞれに当該保持器から連接配置されたものであり、且つ、当該転動体の回転軸と当該保持器の軸心を含む面に対して略面対称となる位置に対をなして配置され、
更に、当該転動体係止部が、当該転動体の軸を挟んで互いに対をなす相手側方向に向かって突出して形成されたものである請求項1~請求項3のいずれかに記載の転がり軸受。 - 前記転動体係止部は、転動体を前記保持器のポケットに収容させた後に、当該保持器に塑性加工を施して形成されたものである請求項1~請求項4のいずれかに記載の転がり軸受。
- 前記転動体係止部は、転動体を前記保持器のポケットに収容させる前に、当該保持器に塑性加工を施して形成されたものである請求項1~請求項4のいずれかに記載の転がり軸受。
- 前記転動体が針状ころである請求項1~請求項6のいずれかに記載の転がり軸受。
- 請求項1~請求項7のいずれかに記載の転がり軸受の製造方法であって、
前記保持器の転動体脱落防止構造は、その形成にスライド型が用いられることを特徴とする転がり軸受の製造方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112011101737T DE112011101737T5 (de) | 2010-05-21 | 2011-05-19 | Wälzlager und Herstellungsverfahren dafür |
CN2011800253245A CN102906433A (zh) | 2010-05-21 | 2011-05-19 | 滚动轴承及其制造方法 |
US13/699,086 US20130148919A1 (en) | 2010-05-21 | 2011-05-19 | Rolling bearing and manufacturing method thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2010-117746 | 2010-05-21 | ||
JP2010117746A JP2011247286A (ja) | 2010-05-21 | 2010-05-21 | 転がり軸受及びその製造方法 |
Publications (1)
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WO2011145693A1 true WO2011145693A1 (ja) | 2011-11-24 |
Family
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PCT/JP2011/061562 WO2011145693A1 (ja) | 2010-05-21 | 2011-05-19 | 転がり軸受及びその製造方法 |
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Country | Link |
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US (1) | US20130148919A1 (ja) |
JP (1) | JP2011247286A (ja) |
CN (1) | CN102906433A (ja) |
DE (1) | DE112011101737T5 (ja) |
WO (1) | WO2011145693A1 (ja) |
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CN105658975A (zh) * | 2013-08-27 | 2016-06-08 | 铁姆肯公司 | 保持架 |
CN111734743A (zh) * | 2019-03-25 | 2020-10-02 | 斯凯孚公司 | 轴承保持架 |
Families Citing this family (5)
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CN104455004A (zh) * | 2014-11-19 | 2015-03-25 | 贵州虹山虹飞轴承有限责任公司 | 一种圆柱滚子轴承金属实体保持架锁口结构 |
JP6776536B2 (ja) | 2016-01-14 | 2020-10-28 | 株式会社ジェイテクト | 円すいころ軸受 |
JP6790517B2 (ja) * | 2016-07-06 | 2020-11-25 | 株式会社ジェイテクト | 円すいころ軸受 |
DE102016220042A1 (de) * | 2016-10-14 | 2018-04-19 | Schaeffler Technologies AG & Co. KG | Käfig für ein Kegelrollenlager |
CN111872396B (zh) * | 2020-05-26 | 2022-07-12 | 东莞市华研新材料科技有限公司 | 基于金属粉末成型的零部件的制备方法 |
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Also Published As
Publication number | Publication date |
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US20130148919A1 (en) | 2013-06-13 |
JP2011247286A (ja) | 2011-12-08 |
DE112011101737T5 (de) | 2013-06-27 |
CN102906433A (zh) | 2013-01-30 |
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