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WO2017164398A1 - Support de palier en résine et son procédé de fabrication, et palier à roulement - Google Patents

Support de palier en résine et son procédé de fabrication, et palier à roulement Download PDF

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Publication number
WO2017164398A1
WO2017164398A1 PCT/JP2017/012135 JP2017012135W WO2017164398A1 WO 2017164398 A1 WO2017164398 A1 WO 2017164398A1 JP 2017012135 W JP2017012135 W JP 2017012135W WO 2017164398 A1 WO2017164398 A1 WO 2017164398A1
Authority
WO
WIPO (PCT)
Prior art keywords
cage
resin
gates
bearing
circumferential direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/012135
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English (en)
Japanese (ja)
Inventor
清水　拓也
啓 高瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to CN201780019186.7A priority Critical patent/CN108884871A/zh
Priority to DE112017001470.0T priority patent/DE112017001470T5/de
Publication of WO2017164398A1 publication Critical patent/WO2017164398A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
    • F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C33/38—Ball cages
    • F16C33/3837—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages
    • F16C33/3843—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • F16C33/3856—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from plastic, e.g. injection moulded window cages
    • 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
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/412—Massive or moulded comb cages, e.g. snap ball cages
    • F16C33/414—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages
    • F16C33/416—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages made from plastic, e.g. injection moulded comb cages
    • 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
    • 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
    • F16C33/4635—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 plastic, e.g. injection moulded window cages
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0027—Gate or gate mark locations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/04—Bearings
    • 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
    • F16C2220/02—Shaping by casting
    • F16C2220/04—Shaping by casting by injection-moulding
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned

Definitions

  • the present invention relates to a cage for a rolling bearing used in railway vehicles, automobiles, industrial machines and the like.
  • the present invention relates to a resin cage formed by injection molding a resin composition and a method for manufacturing the same.
  • the present invention also relates to a rolling bearing using the resin cage.
  • Rolling bearings have rolling elements such as balls and cylindrical rollers arranged in a raceway space between an inner ring and an outer ring, and these rolling elements are held by a cage.
  • metal materials such as high-strength brass have been used for bearing cages.
  • Metal cages are heavy, and wear is generated in the bearing during use, accelerating the deterioration of the lubricant. Therefore, from the viewpoint of extending the life and weight of the bearing (lubricant), the cage is being made of a synthetic resin material.
  • metal cages such as high-strength brass
  • resin cages are generally manufactured by injection molding, but this gives dimensional accuracy compared to metal material machining. Is difficult.
  • a molten resin 17 is injected into a mold cavity 16 through a runner 18 and a gate 19 with high pressure. Go. At this time, the molten resin 17 injected from the gate 19 into the mold cavity 16 is branched in a complicated manner, and joined again after moving the same distance to form a molten resin joint called a weld 20.
  • Patent Document 1 proposes a cage that makes it easy to ensure accuracy such as roundness and cylindricity by disposing the gate portion in the center in the axial direction of the column portion.
  • Patent Document 2 in a cage in which a gate part and a weld part are located in separate pillar parts, a corner part of the pocket part is adjusted and a pillar part in which the gate part is located and a pillar part in which the weld part is located.
  • Patent Document 3 proposes a cage in which the strength of the weld portion is improved by optimizing the orientation of the reinforcing fiber material.
  • FIG. 10 shows an example of a conventional resin cage for bearings manufactured by injection molding.
  • the cage 11 includes a plurality of pocket portions 12 for holding rolling elements, an axial column portion 13 formed between the pocket portions 12, and an annular portion 14 for fixing the column portions 13 on both sides in the axial direction. And comprising.
  • Gates 15 that are equally distributed in the circumferential direction are provided in the inner diameter portion of the pillar portion 13, and the resin injected from the gate 15 into the mold cavity forms a weld portion (weld line) at the broken line portion of the figure.
  • the gate 15 is disposed at the center in the axial direction of the column portion 13 (see Patent Document 1).
  • the resin Since the resin is injected into the cavity space at a high pressure, if the inflow speed is too high, the air in the cavity is rapidly compressed, and the bond between the resins at the weld portion becomes weak and the weld strength decreases. On the other hand, if the inflow rate of the resin is too slow, the resin is cooled before reaching the weld, and the bond between the resins is weakened. In general, as shown in FIG. 11A, the resin bites in firmly, and the weld area increases as the bonding area increases. On the other hand, as shown in FIG.
  • This invention is made in view of such a background, and it aims at providing the resin-made cage for bearings which is excellent in the strength in a weld part, and its manufacturing method. It is another object of the present invention to provide a rolling bearing using the resin cage.
  • the bearing resin cage of the present invention is an annular bearing resin cage that is an injection molded body of a resin composition, and the cage includes a plurality of pocket portions that hold rolling elements, An axial column located between the pockets, and an annular portion for fixing the column on both sides in the axial direction, and at least one portion of the column and the annular portion It has a weld line at one or a plurality of locations in the direction, and the shape of the portion in the vicinity of the weld line is asymmetric with respect to a cross section along the weld line.
  • a plurality of thinned portions formed at equal intervals in the circumferential direction and ribs formed between the thinned portions on the outer end surface of the annular portion of the cage, and the weld line is formed on the ribs.
  • the rib shape is (1) circumferential thickness is non-uniform in the radial direction, (2) circumferential thickness is non-uniform in the axial direction, and (3) axial thickness. Is at least one of non-uniform in the radial direction.
  • a plurality of thinned portions formed at equal intervals in the circumferential direction and ribs formed between the thinned portions on the outer end surface of the annular portion of the cage, and the weld line is formed on the ribs.
  • One of the meat thinning portions located and adjacent to the rib has at least one of a convex portion protruding from the surface constituting the meat thinning portion and a concave portion recessed from the surface constituting the meat thinning portion. It is characterized by.
  • the resin composition is a resin composition obtained by blending glass fiber or carbon fiber with a polyamide resin.
  • the manufacturing method of the resin cage for bearings of the present invention is a method for manufacturing the above cage of the present invention, and is equally spaced in the circumferential direction with respect to the mold cavity of the shape of the cage.
  • the resin composition is injection-filled and molded from a plurality of gates provided.
  • This manufacturing method is characterized in that two or more gates having different resin flow rates are provided as the gate. Further, the plurality of gates are provided in each of the pillar portions, and two or more gates having different axial positions in the respective pillar portions are provided as the gates.
  • the rolling bearing of the present invention is a rolling bearing having a rolling element and a cage for holding the rolling element, wherein the cage is a resin cage for a bearing of the present invention.
  • the bearing resin cage of the present invention includes a plurality of pocket portions for holding rolling elements, axial column portions positioned between the pocket portions, and an annular portion for fixing the column portions on both sides in the axial direction. And at least one of the pillar part and the annular part has a weld line at one or more places in the circumferential direction, and the shape of the part in the vicinity of the weld line extends along the weld line. Since the cross section is asymmetric with respect to the cross section, the flow of the molten resin in the weld portion can be disturbed during injection molding, and the joining area can be increased, so that a cage excellent in the strength of the weld portion can be obtained.
  • the rib shape is as follows: (1) circumferential thickness is non-uniform in radial direction, (2) circumferential thickness is non-uniform in axial direction, and (3) axial thickness is non-uniform. Since it is at least one of non-uniform in the radial direction, it can be manufactured only by slightly changing the shape of a conventional rib. For this reason, the strength of the weld portion can be improved without increasing the manufacturing cost.
  • the annular portion of the cage On the outer end surface of the annular portion of the cage, there are a plurality of thinned portions formed at equal intervals in the circumferential direction, and a rib formed between the thinned portions, and the weld line is positioned on the rib.
  • one of the meat thinning portions adjacent to the rib has at least one of a convex portion projecting from the surface constituting the meat thinning portion and a concave portion recessed from the surface constituting the meat thinning portion, Manufacture can be performed only by applying a slight shape change to the meat thinning portion. For this reason, as described above, the strength of the weld portion can be improved without increasing the manufacturing cost.
  • the resin composition is a resin composition in which glass fiber or carbon fiber is blended with polyamide resin, the moldability is excellent, the cage strength is excellent, and the weight can be further reduced.
  • the rolling bearing of the present invention uses the resin cage for bearings of the present invention, it is possible to prevent the occurrence of problems such as breakage of the cage at the weld portion while employing the resin cage.
  • FIG. 1A is a perspective view of an annular retainer
  • FIG. 1B is a plan view of a retainer having ribs and thinned portions on the outer end face of the retainer.
  • an annular resin cage 1 ′ includes a plurality of pocket portions 4 that hold rolling elements and a column portion 6 that is positioned between the pocket portions 4 along the axial direction. And an annular portion 5 for fixing the column portion 6 on both sides in the axial direction.
  • a weld portion (weld line) is formed at the circumferential center position of the portion that constitutes each pocket portion 4 in the annular portion 5. (Same location as FIG. 10).
  • the resin cage 1 '' shown in FIG. 1 (b) has the same overall configuration as the cage shown in FIG. 1 (a), while the meat thinning portion 3 and the meat thinning portions 3 are arranged on the cage end face. Ribs 2 are formed between the two.
  • the resin passage cross-sectional area in the mold cavity it is preferable to make the resin passage cross-sectional area in the mold cavity substantially constant.
  • the resin cage 1 ′ as shown in FIG. 1 (a) is manufactured by injection molding, the annular portion becomes too thick, so that the thinning is performed by performing the thinning as shown in FIG. 1 (b).
  • the rib 2 is formed as described above because it is desired to secure a bonding area as much as possible in the weld portion while the portion 3 is formed. That is, the weld line is located in the rib 2 portion.
  • the shape in the vicinity of the weld line such as a rib is set to be asymmetric with respect to the cross section along the weld line. Due to this asymmetrical shape, the flow of the resin in the welded portion is disturbed, the bonding area is increased, or a combination thereof can provide a high bonding force.
  • the cross section along a weld line is formed as a surface which divides
  • FIG. 2 is an enlarged view (FIG. 2 (a)) and a perspective view (FIG. 2 (b)) around the rib and the thinned portion in the resin cage.
  • the rib 2 shown in FIG. 2 (a) is formed between two thinned portions 3 among a plurality of thinned portions 3 formed at equal intervals in the circumferential direction, and the thickness in the circumferential direction is a diameter.
  • the direction is non-uniform. Specifically, the thickness of the rib 2 in the axial direction is constant, the outer diameter side wall thickness t wo is set smaller than the inner diameter side wall thickness t wi , and the rib 2 has one surface 2a.
  • the other surface 2b is inclined so as to expand in the circumferential direction toward the inner diameter side.
  • the weld line in the cage 1 is located at the approximate center of the rib 2 in the circumferential direction.
  • the rib 2 has an asymmetric shape with respect to the cross section X along the weld line.
  • FIG. 3 (a) and 3 (b) are enlarged views of the periphery of the rib and the fillet portion in each resin cage
  • FIG. 3 (a) is a view of the annular portion viewed from the outer diameter direction
  • FIG. 3B is a view of the weld cross section viewed from the circumferential direction.
  • the rib 2 shown in FIG. 3 (a) is formed between two thickened portions 3 among a plurality of thickened portions 3 formed at equal intervals in the circumferential direction, and the thickness in the circumferential direction is axial. The direction is non-uniform.
  • the radial thickness of the rib 2 is constant, the wall thickness t we on one end surface side is set smaller than the wall thickness t wm on the other end surface side,
  • the other surface 2b is inclined so as to expand in the circumferential direction toward the other end surface.
  • the rib 2 has an asymmetric shape with respect to a cross section along the weld line.
  • the rib 2 shown in FIG. 3B has a non-uniform axial thickness in the radial direction. Specifically, the thickness of the rib 2 in the circumferential direction is constant, the outer diameter side thickness t do is set smaller than the inner diameter side thickness t di , and the rib 2 surface 2c is on the inner diameter side. The shape is inclined so as to spread in the axial direction.
  • FIG. 4A is an enlarged view around the rib and the thinned portion in the resin cage
  • FIG. 4B is a cross-sectional view taken along the line A-A ′ in FIG.
  • the rib 2 shown in FIG. 4 is formed between two meat thinning portions 3 among a plurality of meat thinning portions 3 formed at equal intervals in the circumferential direction.
  • the rib 2 itself is a rib having a normal shape.
  • the surface 3b which comprises the meat thinning part 3 adjacent to the rib 2
  • the recessed part 3c recessed from this surface is provided.
  • the recess 3c becomes a protrusion in the cavity at the time of injection molding, obstructs the flow of the molten resin, and can disturb the flow at the weld portion formed at the position of the rib 2.
  • FIG. 5A is an enlarged view around the rib and the thinned portion in the resin cage
  • FIG. 5B is a cross-sectional view taken along line B-B ′ in FIG.
  • the rib 2 shown in FIG. 5 is a rib having a normal shape as in FIG.
  • the convex part 3d which protrudes from this surface is provided.
  • This convex part 3d becomes a sudden expansion part in the cavity at the time of injection molding, and can disturb the flow at the weld part formed at the position of the rib 2.
  • a cross-section along the weld line formed in the rib has a shape near the weld line by providing a concave portion or a convex portion in the thinned portion adjacent to the rib.
  • the shape becomes asymmetric.
  • the concave portion becomes a protrusion and the convex portion becomes a rapidly expanding portion, and the strength in the weld portion is improved by inducing disturbance of the flow of the molten resin.
  • the weld line be positioned on the rib, and the position of the gate may be provided in either the column portion or the annular portion.
  • the number of gates can also be set as appropriate.
  • a tunnel gate, a side gate, a disk gate, or the like can be provided as appropriate in accordance with the formation position.
  • the manufacturing method of the resin cage for bearings of the present invention is a method for manufacturing the cage of the present invention as described above.
  • a mold cavity having a cage shape including the above-mentioned non-uniform ribs for example, a molten resin of a predetermined resin composition from a plurality of gates provided at equal intervals in the circumferential direction in a portion that becomes a pillar portion Injection molded.
  • the mold used in this manufacturing method is composed of a fixed mold (fixed-side mold) and a movable mold (movable-side mold) that can be clamped and opened with respect to the fixed mold.
  • the mold cavity is formed by the fixed mold and the movable mold that are clamped.
  • retainer it can also form with the metal mold
  • FIG. 6A shows an example of the gate shape
  • FIG. 6B shows an example of the gate position.
  • equally spaced gates 7a and 7b are arranged in the circumferential direction on the inner diameter portions of the plurality of column portions 6, and the respective gate diameter dimensions are different. There may be two or more gates having different gate diameters, and all the gates may have different diameters.
  • FIG. 6A shows an example of the gate shape
  • FIG. 6B shows an example of the gate position.
  • all are the figures which looked at the holder
  • equally spaced gates 7a and 7b are arranged in the circumferential direction on the inner diameter portions of the plurality of column portions 6, and the respective gate diameter dimensions are different.
  • equally-spaced gates 7a and 7b are arranged in the circumferential direction on the inner diameter portions of the plurality of column portions 6, and the axial positions of the respective column portions 6 are different. Similar to the above, it is sufficient that there are two or more gates having different axial positions in each column portion, and all the gates may have different axial positions.
  • FIG. 7A and 7B An example of an injection filling structure in the method for manufacturing a resin cage for bearings of the present invention will be described with reference to FIG. 7A and 7B, the molten resin passes through the spool 8a, and then passes through the runner 8b and is injected and filled into the mold cavity 10 through the gate 9.
  • the angles of the runners 8b and 8c directly connected to the gate 9 are different. Thereby, the direction of the resin injected into the mold cavity 10 can be made non-uniform.
  • the diameter dimension of runners 8b and 8c differs.
  • the disturbance in the weld portion can be induced by the difference in the state of the resin injected from each gate 9. It is sufficient that there are two or more gates with different runner structures directly connected as described above, and all the gates may have different runner structures.
  • the resin composition used as the material for the resin cage for bearings of the present invention can be used as long as it can be injection-molded and has sufficient heat resistance and mechanical strength as the cage material.
  • the synthetic resin used as the base resin of the resin composition include polyamide 6 (PA6) resin, polyamide 6-6 (PA66) resin, polyamide 6-10 (PA610) resin, polyamide 6-12 (PA612) resin, Polyamide (PA) resin such as polyamide 4-6 (PA46) resin, polyamide 9-T (PA9T) resin, polyamide 6-T (PA6T) resin, polymetaxylene adipamide (polyamide MXD-6) resin, injection molding Fluorine resin, polyethylene (PE) resin such as low density polyethylene, high density polyethylene, ultra high molecular weight polyethylene, polyacetal (POM) resin, polyphenylene sulfide (PPS) resin, polyether ether ketone (PEEK) resin, polyamideimide ( PAI) resin, polyetherimide PEI) resins, and injection moldable
  • these resin compositions have glass fibers, aramid fibers, carbon fibers, various mineral fibers (whiskers), etc. as long as they do not impair the injection moldability. It is preferable to blend the fibrous reinforcing material.
  • glass fibers or carbon fibers are preferably blended because they are excellent in reinforcing effect and availability.
  • the blending range of the fibrous reinforcing material is, for example, about 15 to 40% by weight with respect to the entire resin composition.
  • additives other than the fibrous filler can be blended within a range that does not impair the function and injection moldability of the cage.
  • the rolling bearing of the present invention is a bearing using the above-described resin cage for bearings of the present invention.
  • An example of the rolling bearing of the present invention will be described with reference to FIG.
  • FIG. 8 is a cross-sectional view of a rolling bearing (cylindrical roller bearing).
  • the rolling bearing 31 includes an inner ring 32 having an inner ring raceway surface 32a on the outer periphery, an outer ring 33 having an outer ring raceway surface 33a on the inner periphery, and an inner ring raceway surface 32a and an outer ring raceway surface 33a.
  • a plurality of cylindrical rollers 34 which are rolling elements that roll, and a resin cage 1 that holds the cylindrical rollers 34 at equal intervals in the circumferential direction with pocket portions.
  • This resin cage 1 is the bearing resin cage of the present invention.
  • This rolling bearing can prevent problems such as breakage of the cage in the weld. Further, by adopting a resin cage, it is possible to extend the life of the lubricant and reduce the weight of the bearing.
  • retainer for cylindrical roller bearings was illustrated in FIG. 8, if it is the shape which has a weld part at the time of injection molding, it can apply also to other arbitrary bearings (for example, a needle roller bearing etc.).
  • Example 1 A cage having the shape shown in FIG. 2 (the overall shape is shown in FIG. 1A) was formed using a resin molding pellet in which glass fiber was blended with 25% by weight of PA66 resin.
  • the gate at the time of injection molding is in the center of the inner diameter part of the column part, and a weld part (weld line) is formed at the center in the circumferential direction of the part constituting each pocket part of the annular part.
  • a cage tensile test was performed using the produced cage. As shown in FIG.
  • FIG. 12A is a cross-sectional view taken along the line CC ′ in FIG.
  • Comparative Example 1 A cage was produced under the same material and under the same conditions as in Example 1 except that the shape of the rib of the cage was changed to the conventional shape (FIG. 1B), and the tensile strength of the weld portion was confirmed.
  • Example 1 was superior to Comparative Example 1 in the tensile strength of the weld portion.
  • the tensile strength of Example 1 was about 110% compared to Comparative Example 1.
  • FIG. 13 shows the results of flow analysis during injection molding under the same conditions as in Example 1. From this result, it was confirmed that a left and right uneven weld line was formed with respect to the center of the rib.
  • the resin cage for bearings of the present invention is excellent in strength at the weld, it can be suitably used as a cage for rolling bearings used in railway vehicles, automobiles, industrial machines and the like.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

La présente invention vise à procurer : un support de palier en résine ayant une partie soudée présentant une excellente résistance ; un procédé de fabrication du support de palier ; et analogues. A cet effet, l'invention porte sur un support de palier annulaire en résine, lequel palier est un article moulé par injection d'une composition de résine et comporte : une pluralité de parties poche (4) qui maintiennent des éléments de roulement ; des parties de pilier qui sont positionnées entre les parties poche respectives et qui s'étendent dans la direction axiale ; et des parties annulaires qui fixent les parties de pilier sur les deux côtés de ces dernières dans la direction axiale. Une ligne de soudure est située dans une ou plusieurs positions dans la direction périphérique au moins au niveau d'une partie des parties de pilier ou des parties annulaires. La forme de ladite partie au voisinage de la ligne de soudure est asymétrique par rapport à une section transversale X s'étendant le long de la ligne de soudure. Par exemple, une pluralité de sections à paroi mince (3) formées à intervalles égaux dans la direction périphérique, et des nervures (2) formées entre les sections à paroi mince respectives (3), sont disposées sur une surface d'extrémité, sur le côté externe du support, de chacune des parties annulaires, une ligne de soudure est positionnée sur chacune des nervures (2), et la nervure (2) est formée de telle sorte que son épaisseur dans la direction périphérique est irrégulière dans la direction radiale.
PCT/JP2017/012135 2016-03-24 2017-03-24 Support de palier en résine et son procédé de fabrication, et palier à roulement Ceased WO2017164398A1 (fr)

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DE112017001470.0T DE112017001470T5 (de) 2016-03-24 2017-03-24 Lager-harzkäfig, herstellungsverfahren dafür, und wälzlager

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WO2019189779A1 (fr) * 2018-03-30 2019-10-03 Ntn株式会社 Élément de retenue en résine, et roulement à rouleaux
JP2020046069A (ja) * 2018-03-30 2020-03-26 Ntn株式会社 樹脂製保持器及び転がり軸受
WO2022264772A1 (fr) * 2021-06-15 2022-12-22 Ntn株式会社 Cage en résine pour roulement et roulement à rouleaux

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CN115298010B (zh) * 2020-03-18 2025-04-15 东丽株式会社 一体化成型体及其制造方法
JP2024077120A (ja) * 2022-11-28 2024-06-07 ミネベアミツミ株式会社 保持器、保持器の製造方法、転がり軸受及び金型

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WO2022264772A1 (fr) * 2021-06-15 2022-12-22 Ntn株式会社 Cage en résine pour roulement et roulement à rouleaux

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