WO2022186342A1 - 保持器及び玉軸受 - Google Patents
保持器及び玉軸受 Download PDFInfo
- Publication number
- WO2022186342A1 WO2022186342A1 PCT/JP2022/009175 JP2022009175W WO2022186342A1 WO 2022186342 A1 WO2022186342 A1 WO 2022186342A1 JP 2022009175 W JP2022009175 W JP 2022009175W WO 2022186342 A1 WO2022186342 A1 WO 2022186342A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resin
- cross
- retainer
- weld
- Prior art date
Links
- 229920005989 resin Polymers 0.000 claims abstract description 98
- 239000011347 resin Substances 0.000 claims abstract description 98
- 210000000078 claw Anatomy 0.000 claims abstract description 65
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 15
- 239000000057 synthetic resin Substances 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims description 24
- 238000001746 injection moulding Methods 0.000 claims description 10
- 229920005992 thermoplastic resin Polymers 0.000 claims description 5
- 229920001187 thermosetting polymer Polymers 0.000 claims description 5
- 235000013372 meat Nutrition 0.000 claims 1
- 230000007423 decrease Effects 0.000 abstract description 11
- 238000000465 moulding Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 240000007643 Phytolacca americana Species 0.000 description 1
- 229920006127 amorphous resin Polymers 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229920006038 crystalline resin Polymers 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2628—Moulds with mould parts forming holes in or through the moulded article, e.g. for bearing 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
- F16C33/38—Ball cages
- F16C33/41—Ball cages comb-shaped
- F16C33/418—Details of individual pockets, e.g. shape or ball retaining means
-
- 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
- F16C33/44—Selection of substances
-
- 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
- B29L2031/045—Bushes therefor
Definitions
- This invention relates to a retainer integrally molded by injecting synthetic resin into a mold.
- a retainer in which a ring portion extending in an annular shape and a plurality of horn portions protruding from the ring portion to one side in the axial direction at equal intervals in the circumferential direction are integrally injection-molded.
- a pocket surrounded on three sides by the circumferentially adjacent corners and the ring is used as a space for accommodating the rolling elements.
- These rolling elements and retainer are bearing parts that constitute a rolling bearing.
- the rolling elements housed in the pockets are interposed between the inner and outer raceways of the rolling bearing.
- weld In an injection-molded retainer, there is a weld, which is the confluence of the molten resin injected into the mold. At the weld, the joined molten resins solidify without being completely mixed together, so the strength becomes relatively weak.
- welds are arranged near the pocket bottom of the ring portion or on the concave bottom surface of the horn portion.
- the cross-sectional area of the one-side resin portion of the retainer is the smallest at the cross-section including the pocket bottom, it is not preferable to arrange the weld near the pocket bottom.
- the resin orientation at the weld is perpendicular to the resin flow direction, and the strength of the weld decreases. That is, the boundary (weld line) of the confluence portion becomes a clear weld, and the weld easily breaks.
- the strength of the cross-section on the concave bottom including the weld may be insufficient with respect to the minimum cross-section on the pocket bottom during high-speed rotation.
- the higher the strength of the synthetic resin the greater the tendency of the weld strength to decrease.
- the problem to be solved by the present invention is to suppress the deformation of the horn portion and the reduction in the strength of the weld in a retainer in which the horn portion and the ring portion are integrally molded of synthetic resin. It is to make both things compatible.
- the present invention provides a synthetic resin injection molding comprising a ring portion extending in an annular shape and a plurality of portions protruding from the ring portion to one side in the axial direction at equal intervals in the circumferential direction.
- said ring portion is most axially spaced in said pocket a base thickness that has a pocket bottom that defines the position of the other side, wherein the corner portion extends in the circumferential direction between the pockets that are adjacent in the circumferential direction and extends axially to the ring portion; a pair of pawls projecting axially to one side from the base at positions circumferentially spaced apart from each other, the pawls facing the pocket inner surface and circumferentially with respect to the pocket inner surface;
- the base thickness has a pair of connecting portions axially connecting the pair of pawls to the ring portion, respectively, and a pair of connecting portions connecting the paired connecting portions in a circumferential direction.
- the weld formed by the injection molding includes the claw, the connecting portion axially connected to the claw, and the circumference of the ring portion axially connected to the connecting portion.
- a configuration is adopted in which they are arranged in a resin region consisting of a directional region.
- the molten resin flowing from one side in the circumferential direction to the other side passes through the filling region for molding the bottom of the pocket, and the molten resin flowing from the other side in the circumferential direction to the other side is After passing through the filling space for molding the intermediate part of the base thickness of the part, the joint part of the nail and the base thickness and the ring part are joined in a wide filling space to form a weld.
- This wide filling space is a filling space whose cross-sectional area expands remarkably in the axial direction in order to mold the inner surface of the pocket of the claw and the facing surface, so the resin flow is easily disturbed, and a clear weld is formed in the solidified resin area.
- the weld since the weld is not perpendicular to the resin flow but oblique to the resin flow, the cross section of the weld becomes large, so it is effective for increasing the strength of the weld. is. As a result, it is also possible to suppress a decrease in weld strength.
- the facing surface of the pawl extends away from the inner surface of the pocket toward the other side in the axial direction from a position nearer to one side in the axial direction with respect to the connecting portion axially connected to the pawl to the connecting portion.
- the weld is It is preferable that the corner surface portion is arranged so as not to protrude from the imaginary plane including one point closest to the pocket in the circumferential direction in the corner surface portion. In this way, the stress concentration at the base of the nail can be alleviated by the corner portion, and the weld can be formed by avoiding the corner portion where stress is relatively high.
- the weld when considering the positional relationship between the weld and the inner surface of the pocket on the outer periphery of the resin region having the weld based on a virtual plane including the central axis of the ring portion, the weld is within the inner surface of the pocket. It may be arranged so as not to protrude from the imaginary plane including the boundary point with the base thickness to the inside surface of the pocket. The weld lengthens at the outer circumference of the resin region due to the difference in circumference between the inner and outer circumferences of the retainer.
- the boundary point between the pocket inner surface and the base thickness of the pawl at the outer periphery is the proximal end of the pawl at the outer periphery, the above-mentioned cross-sectional area expands significantly in the axial direction after passing this point. Therefore, it is possible to obscure the weld at the outer periphery of the resin region where the weld is relatively long, thereby suppressing a decrease in strength.
- the cross-sectional area of the one-side resin cross section including the pocket bottom is A1
- any position in the circumferential direction including the intermediate portion is Assuming that the minimum cross-sectional area formed by the ring portion and the intermediate portion in the one-side resin cross-section of is A2, the cross-sectional area A2 is preferably less than three times the cross-sectional area A1. This makes it possible to reduce the volume of the corner by reducing the cross-sectional area A2.
- the cross-sectional area A2 is preferably twice or less than the cross-sectional area A1. This makes it possible to further reduce the volume of the horn.
- the claw portion may have an ejection shaft protruding between the pair of claws. If the vicinity of the recessed bottom between the pair of claws is narrow, the eject pin that projects the retainer when ejecting from the mold interferes with the facing surfaces of the claws and cannot properly poke the intermediate portion of the base. By molding the eject shaft protruding between the pair of claws, the eject pin can be brought into contact with the eject shaft to eject the retainer. Therefore, the present invention can be applied even when the outer diameter of the retainer is small.
- the type of synthetic resin is not particularly limited.
- a thermoplastic resin may be used as the synthetic resin, or a thermosetting resin may be used.
- the position of the gate during injection molding that is, the gate mark formed on the retainer can be arranged, for example, on the surface forming the inner diameter or outer diameter of the ring portion and the plurality of horn portions.
- a ball bearing comprising a retainer, an inner ring, an outer ring, and the plurality of rolling elements arranged between the raceway of the inner ring and the raceway of the outer ring according to the present invention is capable of suppressing deformation of corners and preventing welding. Suppression of strength reduction makes it suitable for high-speed rotation.
- the present invention by adopting the above configuration, in a retainer in which the horn portion and the ring portion are integrally molded of synthetic resin, the deformation of the horn portion due to centrifugal force is suppressed and the strength of the weld is reduced. can be compatible with suppressing
- FIG. 2 is an enlarged front view showing the vicinity of the pocket of the retainer according to the first embodiment of the invention from the radially outer side; BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the ball bearing which concerns on 1st embodiment of this invention
- FIG. 2 is a perspective view showing the retainer of FIG. 1 from one axial side;
- FIG. 2 is a side view of one axial side of the retainer of FIG. 1 ;
- FIG. 4 is a partial side view of one axial side of the retainer according to the second embodiment of the present invention; 6 is a partially enlarged cross-sectional view showing a cut surface corresponding to FIG. 5 of the retainer of FIG.
- the retainer 1 shown in FIGS. 1 to 5 is a bearing component for evenly arranging a plurality of rolling elements 4 arranged between an inner ring 2 and an outer ring 3 in the circumferential direction.
- a plurality of rolling elements 4 are interposed in a row in the circumferential direction between an inner raceway 5 formed on the inner ring 2 and an outer raceway 6 formed on the outer ring 3 .
- the rolling elements 4 consist of balls.
- the respective central axes (not shown) of the retainer 1, inner ring 2 and outer ring 3 are arranged coaxially and correspond to the bearing central axis which is the design rotation center of the ball bearing.
- the central axis of the retainer 1 will simply be referred to as the "central axis”.
- the axial direction refers to the direction along the central axis.
- one side in the axial direction means one direction in the axial direction, which is the left side in FIG.
- the other side in the axial direction means a direction opposite to the one direction, which is the right side in FIG.
- the radial direction means a direction perpendicular to the central axis.
- the radially outer side refers to the direction away from the central axis in the radial direction, and is the upper side in FIG. 2 .
- the radially inner side refers to a direction approaching the central axis in the radial direction, and is the lower side in FIG. 2 .
- circumferential direction refers to the direction along the circumference of a circle around the central axis.
- a virtual plane perpendicular to the central axis is called a "radial plane”.
- a virtual plane including the central axis is called an "axial plane”.
- the retainer 1 has a ring portion 7 extending in an annular shape and a plurality of horn portions 8 protruding from the ring portion 7 to one side in the axial direction at equal intervals in the circumferential direction. It consists of a molded product integrally formed by injection molding of synthetic resin. The entire retainer 1 is formed by injection molding.
- the synthetic resin may be either a thermoplastic resin or a thermosetting resin as long as it is a resin that can be injection molded, and either a crystalline resin or an amorphous resin may be used.
- Synthetic resins are mainly composed of thermosetting resins or thermoplastic resins, to which other thermosetting resins, thermoplastic resins, rubbers, glass fibers, carbon fibers, carbon black, graphite, etc. are added as appropriate. There may be.
- the ring portion 7 is made of a resin portion that continues along the entire circumferential direction.
- the horn portion 8 is made of a cantilevered resin portion protruding from one side of the ring portion 7 in the axial direction.
- the outer diameter surface and the inner diameter surface of the ring portion 7 are cylindrical surfaces extending in the circumferential direction.
- the outer diameter surface and the inner diameter surface of the ring portion 8 are flush with the outer diameter surface or the inner diameter surface of the ring portion 7, respectively.
- the outer diameter and inner diameter of the retainer 1 correspond to the diameters of imaginary cylindrical surfaces that circumscribe or inscribe the ring portion 7 and the plurality of horn portions 8, respectively.
- the ring portion 7 has a plurality of pocket bottoms 9 exposed on one side surface of the retainer 1 in the axial direction.
- the pocket bottoms 9 are present on the same circumference at regular intervals in the circumferential direction. These pocket bottoms 9 are located on one side of the ring portion 7 in the axial direction.
- the ring portion 7 has the other end face located at the end of the retainer 1 on the other end in the axial direction.
- the other end surface of the ring portion 7 has a flat surface shape along the radial direction over the entire circumferential direction.
- a side surface of the retainer 1 on the other side in the axial direction is formed of a ring portion 7 .
- dashed-dotted lines L1 to L4 indicate radial planes
- dashed-dotted lines L5 to L7 indicate axial planes.
- a radial plane L1 shown in FIGS. 1 and 5 is located in contact with the pocket bottom 9 of the ring portion 7 in the axial direction.
- a radial plane L2 shown in FIG. 1 is located in contact with the other end face of the ring portion 7 in the axial direction.
- a radial plane L3 shown in FIG. 1 is located at a position axially in contact with a portion of the horn portion 8 which is closest to one side in the axial direction.
- the resin portion forming the ring portion 7 exists in an axial region B1 between the radial plane L1 and the radial plane L2, and extends along the entire circumferential direction in the axial region B1. Contiguous.
- the resin portion forming the corner portion 8 exists in an axial region B2 between the radial plane L1 and the radial plane L3, and is not continuous along the entire circumferential direction in this axial region B2.
- the claw portion 8 has a base thickness 10 axially connected to the ring portion 7 and a pair of claws 11a and 11b protruding from the base thickness 10 to one side in the axial direction.
- the retainer 1 accommodates the rolling elements 4 in pockets 12 surrounded from three sides by the four portions 8, 8 and the ring portion 7 adjacent in the circumferential direction.
- the pocket 12 is a space that opens radially outward, radially inward, and axially on one side.
- the pockets 12 are formed in the same number as the number N of the plurality of horn portions 8 .
- One rolling element 4 is accommodated in each pocket 12 .
- the retainer 1 has a shape having N-fold rotational symmetry about its central axis.
- the pocket 12 radially penetrates between the outer diameter surface and the inner diameter surface of the retainer 1, and the radially outer opening and the radially inner opening allow the rolling elements 4 to pass therethrough in the radial direction. It's a caliber that can't be done.
- the retainer 1 elastically deforms the plurality of horn portions 8 to widen the opening of the pocket 12 on one side in the axial direction, thereby moving the plurality of rolling elements 4 arranged between the inner and outer raceways 5 and 6. It is a crown-shaped retainer that can be accommodated in a plurality of pockets 12 .
- the resin surface that forms the pocket 12 has a shape that roughly follows the phantom spherical surface, and includes a contact area that defines the pocket clearance between the rolling element 4 and the rolling element 4 .
- the cage 1 and the rolling elements 4 are relatively free to move within the range of the pocket clearance.
- the center of the phantom spherical surface coincides with the center of the rolling elements 4 arranged on the pitch circle diameter of the plurality of rolling elements 4 .
- the resin surface forming the pocket 12 is symmetrical with respect to a virtual plane including the center and the central axis.
- the claws 11a and 11b are elastically deformed to move axially of the pocket 12.
- the opening on one side expands, and the rolling elements 4 enter between the adjacent corners 8,8.
- the pocket bottom 9 of the ring portion 7 defines the position of the pocket 12 closest to the other side in the axial direction.
- the pocket bottom 9 is the portion of the resin surface forming the pocket 12 that is closest to the other side in the axial direction.
- FIG. 1 shows the spherical diameter D of the phantom spherical surface described above.
- the pocket bottom 9 is located at one end of the spherical diameter D.
- the base 10 of the tongue portion 8 is composed of a resin portion that extends in the circumferential direction between the pockets 12, 12 that are adjacent in the circumferential direction.
- the pair of claws 11a and 11b consists of a first claw 11a and a second claw 11b that are circumferentially spaced from each other.
- Each of the claws 11a and 11b is composed of a cantilevered resin portion protruding from one side of the base thickness 10 in the axial direction.
- a recessed space having a depth on the other side in the axial direction from the toe is formed between the pair of claws 11a and 11b of the claw portion 8.
- the volume of the horn portion 8 is reduced compared to the case where the recessed space is filled with the resin portion. Due to the reduction in the volume of the hone portion 8, the centrifugal force acting on the hone portion 8 during rotation of the retainer 1 is reduced, and deformation of the hone portion 8 due to the centrifugal force is suppressed.
- the base thickness 10 includes a pair of connecting portions 10a and 10b that connect the pair of claws 11a and 11b to the ring portion 7 in the axial direction, respectively, and an intermediate portion 10c that connects the pair of connecting portions 10a and 10b in the circumferential direction.
- Each claw 11a, 11b has a pocket inner surface 13 facing the pocket 12 and a facing surface 14 located on the opposite side of the pocket inner surface 13 in the circumferential direction.
- the resin surface forming the pocket 12 is formed by the pocket inner surface 13 of the first claw 11a of the first claw 8 of the adjacent claws 8, 8 and the second claw of the second claw 8. 11b and the pocket bottom 9 of the ring portion 7.
- the pocket bottom 9 is point-shaped, and the pocket inner surfaces 13, 13 of the first and second claws 11a, 11b constitute all of the resin surfaces forming the pocket 12 except for the pocket bottom 9. is doing.
- the facing surface 14 of each of the claws 11a and 11b extends from a position nearer to one side in the axial direction to the connecting portions 10a and 10b axially connected to the claws 11a and 11b. It has a corner surface portion 15 that curves away from the pocket inner surface 13 and a curved surface portion 16 that curves toward the pocket inner surface 13 from the corner surface portion 15 toward one side in the axial direction.
- the boundary between the corner surface portion 15 and the curved surface portion 16 is an inflection portion.
- the circumferential width of each claw 11a, 11b is maximized at the root of each claw 11a, 11b and becomes smaller toward the tip thereof.
- the intermediate portion 10c of the base 10 has a concave bottom surface 17 that connects the roots of the pair of claws 11a and 11b in the circumferential direction.
- the concave bottom surface 17 is exposed on one axial side surface of the retainer 1 .
- the concave bottom surface 17 is flat in the circumferential and radial directions.
- the radial plane L4 is located on the outer diameter surface of the retainer 1 and includes the roots of the claws 11a and 11b. That is, the radial plane L4 is positioned at the boundary between the pocket inner surface 13 and the base thickness 10 on the outer diameter surface of the retainer 1 . Moreover, the radial plane L4 is located in contact with the concave bottom surface 17 in the axial direction.
- the resin portion forming the base thickness 10 exists in an axial region B3 between the radial plane L1 and the radial plane L4, and is continuous in the circumferential direction between the pockets 12 adjacent in the circumferential direction.
- Each resin portion constituting each claw 11a, 11b exists in an axial region B4 between the radial plane L3 and the radial plane L4, and circumferentially adjacent claws 11a, 11b are discontinuous in the circumferential direction. It has become.
- the axial plane L5 is located at a position including the boundary point P1 between the concave bottom surface 17 and the corner surface portion 15 on the outer diameter surface of the retainer 1 .
- Each connecting portion 10a, 10b is a region between the corresponding axial plane L5 and axial plane L6 on the outer diameter surface of the retainer 1 (that is, corresponds to the circumferential width of the claw 11a or claw 11b to be connected), It also forms the resin surface of the section corresponding to the axial region B3.
- Each intermediate portion 10c corresponds to a region between circumferentially adjacent axial planes L5, L5 on the outer diameter surface of the retainer 1 (that is, a circumferential distance between a pair of connecting portions 10a, 10b). ), and the resin surface of the section corresponding to the axial region B3.
- the ring portion 7 which is a continuous part around the entire circumference, is the same in the one-side resin cross-section at any position in the circumferential direction.
- the one-sided resin cross section refers to the cross section of the resin portion when the radial range between the outer diameter of the retainer 1 and the central axis is cut on the axial plane.
- A1 be the cross-sectional area of the one-sided resin section cut along the axial plane including the pocket bottom 9.
- the one-side resin cross section of the cross-sectional area A1 corresponds to the resin cross section of the cage 1 shown in FIG. 2 and the resin cross section of the lower side portion of the cage 1 shown in FIG.
- the cross-sectional area A1 is the smallest cross-sectional area among arbitrary one-side resin cross-sections of the retainer 1 .
- A2 be the minimum cross-sectional area formed by the ring portion 7 and the intermediate portion 10c in the one-side resin cross-section at any circumferential position including the intermediate portion 10c.
- the one-side resin cross-section having the smallest cross-sectional area A2 corresponds to the one-side resin cross-section in the upper portion of the retainer 1 shown in FIG.
- the cross-sectional area A2 is less than three times the cross-sectional area A1 in order to reduce the volume of the horn portion 8 by thinning the intermediate portion 10c in the axial direction.
- the cross-sectional area A2 is less than twice the cross-sectional area A1.
- radial arrows indicate the circumferential positions of the gates G through which the synthetic resin is injected
- radial arrows indicate the circumferential positions of the welds W formed in the retainer 1 by injection molding.
- the resin in the gate G is sheared to form a gate mark on the retainer 1 at the position of the gate G.
- Gate traces corresponding to the gate G may be arranged on either the outer diameter surface or the inner diameter surface of the retainer 1 .
- the weld W is arranged outside the one-sided resin cross section with cross-sectional area A2 shown in the upper side of FIG. 5 and the one-sided resin cross section with cross-sectional area A1 shown in the lower side of FIG.
- one claw 11a (or 11b), one connecting portion 10a (or 10b) connected to the claw 11a (or 11b) in the axial direction Let us consider a resin region consisting of a connecting portion 10a (or 10b) and a circumferential region of the ring portion 7 axially connected to the connecting portion 10a (or 10b). Such resin regions are present in the same number as the claws 11a and 11b of the retainer 1, and are evenly distributed in the retainer 1 in the circumferential direction. Considering the example of FIG.
- the section occupied by the outer periphery of one resin region on the outer diameter surface of the retainer 1 is the range between the adjacent axial planes L5 and L6 in the circumferential direction, And in the axial direction, it is the range between the radial plane L2 and the radial plane L3 (axial regions B1 and B2).
- a schematic line of the weld W on the outer diameter surface of the retainer 1 is indicated by a chain double-dashed line in FIG.
- the weld W is arranged in the range between the adjacent axial planes L5 and L6 in the circumferential direction.
- the weld W includes a point P3 closest to the pocket 12 in the circumferential direction in the corner portion 15. It is arranged so as not to protrude from the axial plane L7 to the corner surface portion 15 side.
- a point P3 is a boundary point between the corner surface portion 15 and the curved surface portion 16 on the outer diameter surface of the retainer 1 .
- Weld W is circumferentially and axially spaced from corner 15 .
- the weld W is axially aligned with the base thickness 10 in the pocket inner surface 13 including the boundary point P2. It is arranged so as not to protrude from the plane L6 toward the pocket inner surface 13 side.
- the weld W is separated from the pocket bottom 9 by D/4 or more.
- the positions and numbers of the gates G and the positions and numbers of the welds W may be appropriately set so that all the welds W formed in the retainer 1 are arranged in any one resin region for each weld W. good.
- the number of gates G and the number of welds W may be appropriately determined according to whether the number N of pockets 12 is even or odd. The smaller the number of welds W, the better.
- the number N of pockets 12 is nine. Therefore, unless at least two gates G are arranged and one weld W is arranged between each gate G, the weld W cannot be formed in the above resin region.
- the number N of pockets 12 is an odd number, as shown in FIG.
- a first weld W is formed between the gates G, G proceeding clockwise, and a second weld W is formed between the gates G, G proceeding counterclockwise from the gate G at the first position to the gate G at the second position.
- a weld W can be formed. That is, the retainer 1 has two gate traces and welds W that are circumferentially separated from each other.
- the gate G can be arranged only at one place in the circumferential direction and the weld W can be formed at the position opposite to the gate G by 180°. .
- the retainer 1 has gate traces and welds W at one location.
- the retainer 1 has a base thickness 10 which extends in the circumferential direction between the pockets 12, 12 which are adjacent to each other in the circumferential direction, and extends axially to the ring portion 7. , a pair of claws 11a and 11b protruding from the base material 10 to one side in the axial direction at positions spaced apart from each other in the circumferential direction, each claw 11a and 11b facing the pocket 12;
- the base 10 has a pair of connecting portions 10a and 10b for axially connecting the pair of claws 11a and 11b to the ring portion 7, respectively. and an intermediate portion 10c that connects the pair of connecting portions 10a and 10b in the circumferential direction. , the volume of the horn portion 8 can be reduced, and deformation of the horn portion 8 due to centrifugal force can be suppressed.
- the ring portion 7 has a pocket bottom 9 that defines the position of the pocket 12 on the othermost side in the axial direction. and the circumferential region of the ring portion 7 axially connected to the connecting portion 10a. be able to. That is, when the retainer 1 is injection-molded, the resin flow around the weld W has a tendency conceptually shown by a plurality of arrows in FIG.
- the filling space for molding the ring portion 7 is filled with the molten resin flowing from one side in the circumferential direction to the other side in the circumferential direction as the first resin flow (flow from the left side to the right side in FIG. 1) to mold the ring portion 7.
- the first resin flow is the filling for molding the claw 11b. It diverts to the space, collides with the transfer surface forming the vicinity of the pocket bottom 9, passes through the filling space with the cross-sectional area A1, and then reaches the filling space for forming the claw 11a.
- the second resin flow passes through the filling space having the cross-sectional area A2 for molding the intermediate portion 10c, and then splits into the filling space for molding the pawl 11b.
- the retainer 1 can increase the strength of the weld W and suppress a decrease in the strength of the weld W.
- the retainer 1 has a pocket from a position where the facing surface 14 of the pawl 11a is shifted to one side in the axial direction with respect to the connecting portion 10a axially connected to the pawl 11a toward the other side in the axial direction to the connecting portion 10a.
- the weld W is arranged so as not to protrude toward the corner surface 15 from a virtual plane (axial plane L7) including a point P3 closest to the pocket 12 in the circumferential direction in the corner surface 15.
- the stress concentration at the base of the nail 11a can be relieved by the corner surface portion 15, and the weld W can be formed by avoiding the corner surface portion 15 where the stress is relatively high. It is possible to prevent destruction from
- the retainer 1 when considering the positional relationship between the weld W and the pocket inner surface 13 on the outer circumference of the resin region having the weld W based on a virtual plane (axial plane) including the central axis of the ring portion 7, the retainer 1 is By arranging the weld W in the pocket inner surface 13 so as not to protrude from the virtual plane (axial plane L6) containing the boundary point P2 with the base thickness 10 to the pocket inner surface 13 side, the weld is formed during injection molding. W is formed in the filling space region where the cross-sectional area expands remarkably in the axial direction even in the outer periphery of the resin region that is relatively long in the circumferential direction. can be obscured to suppress a decrease in strength.
- the cage 1 when considering a one-side resin cross section cut along a virtual plane (axial plane) including the central axis of the ring portion 7, the cage 1 has a cross-sectional area A1 of the one-side resin cross section including the pocket bottom 9, and the intermediate portion 10c The minimum cross-sectional area A2 formed by the ring part 7 and the intermediate part 10c in the one-sided resin cross-section at any circumferential position including volume can be reduced.
- the strength of the weld W may decrease to about 1/3 per unit cross-sectional area compared to the non-weld portion. Therefore, when the weld is arranged in the cross-sectional area A2 area as in the conventional example, it is preferable to make the cross-sectional area A2 three times or more the cross-sectional area A1 in terms of strength comparison with the cross-sectional area A1 area (pocket bottom). . On the other hand, as described above, if the weld W is arranged in the resin region outside the cross-sectional area A1 and the cross-sectional area A2 to suppress the decrease in strength, the strength can be compared even if the cross-sectional area A2 is less than three times the cross-sectional area A1. You can avoid the above problem.
- the cross-sectional area A2 of the retainer 1 is not more than twice the cross-sectional area A1, the volume of the claw portion 8 can be further reduced.
- the ball bearing provided with this retainer 1 is suitable for high-speed rotation by suppressing deformation of the tooth portion 8 and suppressing a decrease in the strength of the weld W.
- FIG. 6 A second embodiment of the invention will be described with reference to FIGS. 6 and 7.
- FIG. In addition, below, it stops at describing a difference with 1st embodiment.
- the claw 20 has an eject shaft 21 projecting between the pair of claws 11a and 11b.
- the eject shaft 21 protrudes from the concave bottom surface 17 and the corner surface portion 15 to one side in the axial direction.
- the eject shaft 21 is a portion that is pushed by an eject pin when ejecting from the mold, and has a dent on its tip surface.
- the eject pin that protrudes the retainer when ejecting it from the mold interferes with the facing surfaces 14 and 14 of the claws 11a and 11b, and the concave bottom surface 17 is properly formed. can't hit. If the eject shaft 21 is molded, the retainer can be ejected by abutting the eject pin against the eject shaft 21. - ⁇ Therefore, the present invention can be applied even when the pitch between the pockets 12 of the retainer is narrow.
- the cross-sectional area is expanded by the eject shaft 21, if the weld W is arranged here, stress concentration occurs at the base of the eject shaft 21, resulting in strength instability.
- the cross-sectional area of the eject shaft 21 is not included in the above calculation of the cross-sectional area A because the eject shaft 21 does not substantially extend circumferentially across the adjacent pockets 12 , 12 .
Landscapes
- 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
Description
2 内輪
3 外輪
4 転動体
7 リング部
8,20 つの部
9 ポケット底
10 基肉
10a,10b 繋ぎ部
10c 中間部
11a,11b 爪
12 ポケット
13 ポケット内面
14 対向面
15 隅面部
17 凹底面
21 イジェクト軸
Claims (10)
- 円環状に延びるリング部と、前記リング部から円周方向に均等間隔で軸方向一方側に突き出ている複数のつの部とが合成樹脂の射出成形によって一体に形成され、円周方向に隣り合う前記つの部と前記リング部とで三方から囲まれたポケットに転動体を収容する保持器において、
前記リング部は、前記ポケットの中で最も軸方向他方側の位置を規定するポケット底を有し、
前記つの部は、円周方向に隣り合う前記ポケット同士の間に亘って円周方向に連なりかつ前記リング部まで軸方向に連なる基肉と、互いに円周方向に離れた位置で前記基肉から軸方向一方側に突き出ている対の爪とを有し、前記爪は、前記ポケットに面するポケット内面と、前記ポケット内面に対して円周方向に反対側に位置する対向面とを有し、前記基肉は、前記対の爪をそれぞれ前記リング部に軸方向に接続する対の繋ぎ部と、前記対の繋ぎ部同士を円周方向に接続する中間部とを有し、
前記射出成形で形成されたウェルドは、前記爪と、当該爪に軸方向に連なる前記繋ぎ部と、この繋ぎ部に軸方向に連なる前記リング部の円周方向領域とからなる樹脂領域に配置されていることを特徴とする保持器。 - 前記爪の前記対向面は、当該爪に軸方向に連なる前記繋ぎ部に対して軸方向一方側に寄った位置から当該繋ぎ部まで軸方向他方側に向かって前記ポケット内面より遠ざかる方に曲がる隅面部を有し、
前記リング部の中心軸を含む仮想平面に基づいて前記ウェルドを有する前記樹脂領域の外周での当該ウェルドと前記隅面部の位置関係を考えたとき、当該ウェルドは、当該隅面部の中で円周方向に最も前記ポケットに近い一点を含む前記仮想平面から当該隅面部側にはみ出ないように配置されている請求項1に記載の保持器。 - 前記リング部の中心軸を含む仮想平面に基づいて前記ウェルドを有する前記樹脂領域の外周での当該ウェルドと前記ポケット内面の位置関係を考えたとき、当該ウェルドは、当該ポケット内面の中で前記基肉との境界点を含む前記仮想平面から当該ポケット内面側にはみ出ないように配置されている請求項1又は2に記載の保持器。
- 前記リング部の中心軸を含む仮想平面で切断した片側樹脂断面を考えたとき、前記ポケット底を含む前記片側樹脂断面の断面積をA1とし、前記中間部を含む任意の円周方向位置の前記片側樹脂断面の中で前記リング部及び前記中間部が成す最小の断面積をA2とすると、断面積A2は、断面積A1の3倍未満になっている請求項1から3のいずれか1項に記載の保持器。
- 前記断面積A2は、前記断面積A1の2倍以下になっている請求項4に記載の保持器。
- 前記つの部は、前記対の爪同士の間に突き出ているイジェクト軸を有する請求項1から5のいずれか1項に記載の保持器。
- 前記合成樹脂として熱可塑性樹脂が使用されている請求項1から6のいずれか1項に記載の保持器。
- 前記合成樹脂として熱硬化性樹脂が使用されている請求項1から6のいずれか1項に記載の保持器。
- 前記射出成形によるゲート痕は、前記リング部及び前記複数のつの部の内径又は外径を成す表面に配置されている請求項1から8のいずれか1項に記載の保持器。
- 請求項1から9のいずれか1項に記載の保持器と、内輪と、外輪と、前記内輪と前記外輪との間に配置された状態で前記ポケットに収容された複数の前記転動体とを備える玉軸受。
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CN202280018604.1A CN116917635A (zh) | 2021-03-04 | 2022-03-03 | 保持器及球轴承 |
US18/280,083 US20240151269A1 (en) | 2021-03-04 | 2022-03-03 | Cage and ball bearing |
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JPH0659627U (ja) * | 1993-02-01 | 1994-08-19 | 日本精工株式会社 | 合成樹脂製冠型保持器 |
JP2012236363A (ja) * | 2011-05-12 | 2012-12-06 | Nsk Ltd | 軸受用樹脂製保持器、及びその製造方法 |
JP2016169766A (ja) * | 2015-03-11 | 2016-09-23 | Ntn株式会社 | 軸受用保持器および軸受 |
JP2019199915A (ja) * | 2018-05-16 | 2019-11-21 | 日本精工株式会社 | 転がり軸受用樹脂製保持器及びその製造方法、並びに転がり軸受 |
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JP2015197210A (ja) | 2014-04-03 | 2015-11-09 | 日本精工株式会社 | 軸受用保持器、及びその製造方法 |
JP7236902B2 (ja) | 2018-03-30 | 2023-03-10 | Ntn株式会社 | 樹脂製保持器及び転がり軸受 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH0659627U (ja) * | 1993-02-01 | 1994-08-19 | 日本精工株式会社 | 合成樹脂製冠型保持器 |
JP2012236363A (ja) * | 2011-05-12 | 2012-12-06 | Nsk Ltd | 軸受用樹脂製保持器、及びその製造方法 |
JP2016169766A (ja) * | 2015-03-11 | 2016-09-23 | Ntn株式会社 | 軸受用保持器および軸受 |
JP2019199915A (ja) * | 2018-05-16 | 2019-11-21 | 日本精工株式会社 | 転がり軸受用樹脂製保持器及びその製造方法、並びに転がり軸受 |
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