JP2008025759A - Rolling bearing for railway vehicle axle - Google Patents

Rolling bearing for railway vehicle axle Download PDF

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JP2008025759A
JP2008025759A JP2006200497A JP2006200497A JP2008025759A JP 2008025759 A JP2008025759 A JP 2008025759A JP 2006200497 A JP2006200497 A JP 2006200497A JP 2006200497 A JP2006200497 A JP 2006200497A JP 2008025759 A JP2008025759 A JP 2008025759A
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synthetic resin
rolling bearing
cage
railway vehicle
section
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Shunichi Yabe
俊一 矢部
Takahiko Uchiyama
貴彦 内山
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NSK Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a railway vehicle axle rolling bearing having improved reliability and durability, with a synthetic resin cage superior in mechanical strength and fatigue resistance, less liable to cause shrinkage cavity in the surface when molded, and good in dimensional accuracy. <P>SOLUTION: The railway vehicle axle rolling bearing comprises, at least, an inner ring 1, an outer ring 2, the synthetic resin cage 4, and rollers 3. The synthetic resin cage 4 is formed of a synthetic resin composition which contains 15-45 mass% modified cross-section glass fibers. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、合成樹脂製保持器を備える鉄道車両車軸用転がり軸受に関する。   The present invention relates to a rolling bearing for a railcar axle provided with a synthetic resin cage.

従来から、軽量化や複雑な形状に加工しやすい等の理由から、転がり軸受用の樹脂製保持器として、ポリアミド６６やポリアミド４６等のポリアミド樹脂、ポリフェニレンサルファイド樹脂に、補強材としてガラス繊維を配合した樹脂組成物を成形したものが使用されている。例えば、直径十数μｍ程度のガラス繊維を配合したポリアミド４６からなる保持器が知られている（特許文献１参照）。   Conventionally, glass fiber as a reinforcing material is added to polyamide resin such as polyamide 66 and polyamide 46, polyphenylene sulfide resin as a resin cage for rolling bearings for reasons such as weight reduction and easy processing into complicated shapes. A molded resin composition is used. For example, a cage made of polyamide 46 in which glass fibers having a diameter of about several tens of μm are blended is known (see Patent Document 1).

また、鉄道車両の車軸用転がり軸受では、黄銅製保持器を備える円筒ころ軸受や、鉄製プレス保持器を備える円すいころ軸受が最も一般的に使用されているが、近年では同様の理由から保持器の合成樹脂化が進み始めている。具体的には、使用環境温度から、ガラス繊維を強化材として用いたポリアミド６６等が使用されている（特許文献２参照）。   Also, in rolling bearings for axles of railway vehicles, cylindrical roller bearings with brass cages and tapered roller bearings with iron press cages are most commonly used. Synthetic resin is starting to advance. Specifically, polyamide 66 or the like using glass fiber as a reinforcing material is used from the ambient temperature (see Patent Document 2).

特許第３００１２８８号公報Japanese Patent No. 3001288 特許２００５−２３３３９３号公報Japanese Patent No. 2005-233393

しかしながら、鉄道車両車軸用転がり軸受は、車両の走行時、レールの継ぎ目を通過するたびに応力を受け、保持器でもポケット部にころ端面が繰り返し衝突する。そのため、応力が分散しやすい合成樹脂製保持器であっても、ポケット部に疲労が蓄積し、亀裂の発生や破損に至るおそれがある。最悪の場合、走行中に軸受が破損し、車軸の回転ができなることも考えられる。   However, the rolling bearings for railcar axles are stressed every time the rail passes through the rail joint, and the roller end face repeatedly collides with the pocket portion even in the cage. For this reason, even a synthetic resin cage in which stress is likely to disperse may cause fatigue to accumulate in the pocket portion, leading to cracking or damage. In the worst case, it is conceivable that the bearing is damaged during traveling and the axle cannot be rotated.

また、鉄道車両車軸用転がり軸受の保持器は直径１５０〜３００ｍｍの大径であるため、ガラス繊維を含有する合成樹脂組成物を用いて成形すると、得られる保持器の表面にヒケが発生しやすく、目的とする寸法公差となるように成形するのが難しく、特に、生産効率の面で好ましい射出成形において顕著である。   In addition, since the cage for rolling bearings for rolling stock axles has a large diameter of 150 to 300 mm, sinking is likely to occur on the surface of the resulting cage when molded using a synthetic resin composition containing glass fiber. It is difficult to mold so as to achieve the target dimensional tolerance, and is particularly remarkable in injection molding that is preferable in terms of production efficiency.

本発明はこのような状況に鑑みてなされたものであり、機械的強度や耐疲労性に優れ、更に成形時に表面のヒケが発生し難く寸法精度も高い合成樹脂製保持器を備え、信頼性及び耐久性に優れた鉄道車両車軸用転がり軸受を提供することを目的とする。   The present invention has been made in view of such a situation, and is provided with a synthetic resin cage that is excellent in mechanical strength and fatigue resistance, is less prone to surface sinking during molding, and has high dimensional accuracy. Another object of the present invention is to provide a rolling bearing for a rolling stock axle having excellent durability.

上記目的を達成するために、本発明は、少なくとも内輪、外輪、合成樹脂製保持器及びころを備える鉄道車両車軸用転がり軸受において、前記合成樹脂製保持器が、異形断面を有するガラス繊維を１５〜４５質量％の割合で含有する合成樹脂組成物からなることを特徴とする鉄道車両車軸用転がり軸受を提供する。   In order to achieve the above object, the present invention provides a rolling bearing for a rolling stock axle comprising at least an inner ring, an outer ring, a synthetic resin cage and rollers, wherein the synthetic resin cage comprises a glass fiber having an irregular cross section. A rolling bearing for a railway vehicle axle comprising a synthetic resin composition contained at a ratio of ˜45 mass% is provided.

本発明の鉄道車両車軸用転がり軸受では、樹脂製保持器を、補強材として異形断面を有するガラス繊維を配合した樹脂組成物製としたため、従来の円形断面のガラス繊維を補強材とする樹脂製保持器に比べて機械的強度や耐疲労性等に優れ、更にはガラス繊維の異方性が低下して成形時のヒケの発生も無く、寸法精度も高まる。そのため、本発明の鉄道車両車軸用転がり軸受は、耐久性及び信頼性により優れるようになる。   In the rolling bearings for rolling stock axles of the present invention, the resin cage is made of a resin composition containing glass fibers having a deformed cross section as a reinforcing material. Excellent mechanical strength and fatigue resistance compared to the cage, and further, the anisotropy of the glass fiber is reduced, there is no occurrence of sink marks during molding, and the dimensional accuracy is increased. For this reason, the rolling bearing for a railway vehicle axle according to the present invention is more excellent in durability and reliability.

以下、本発明の実施形態について詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.

本発明において、鉄道車両車軸用転がり軸受は、樹脂製保持器を備える限り、その構造等には制限がなく、例えば図１及び図２に示す鉄道車両車軸用転がり軸受を例示することができる。尚、図１は鉄道車両車軸用転がり軸受の構造を示す部分縦断面図、図２は図１の鉄道車両車軸用転がり軸受で車軸を支持された鉄道車両の一部分を示す図である。   In the present invention, as long as the rolling bearing for the rolling stock axle is provided with a resin cage, the structure or the like is not limited. For example, the rolling bearing for the rolling stock axle shown in FIGS. 1 and 2 can be exemplified. FIG. 1 is a partial longitudinal sectional view showing the structure of a rolling bearing for a railway vehicle axle, and FIG. 2 is a view showing a part of the railway vehicle in which the axle is supported by the rolling bearing for a railway vehicle axle of FIG.

図１に示すように、鉄道車両車軸用転がり軸受１０は、外周面に軌道面１ａを有する内輪１と、内輪１の軌道面１ａに対向する軌道面２ａを内周面に有する外輪２と、内輪１及び外輪２の間に転動自在に配された複数の円筒ころ（転動体）３と、内輪１及び外輪２の間に円筒ころ３を保持する保持器４と、を備えている。また、保持器４には、円筒ころ３を保持するための円筒形のポケット４ａが、周方向にわたって互いに等間隔をあけて形成されていて、円筒ころ３は周方向に等配に配置される。   As shown in FIG. 1, a rolling bearing 10 for a railway vehicle axle includes an inner ring 1 having a raceway surface 1 a on an outer peripheral surface, an outer ring 2 having a raceway surface 2 a facing the raceway surface 1 a of the inner ring 1 on an inner peripheral surface, A plurality of cylindrical rollers (rolling elements) 3 are provided between the inner ring 1 and the outer ring 2 so as to be freely rollable, and a cage 4 that holds the cylindrical rollers 3 between the inner ring 1 and the outer ring 2. The cage 4 is formed with cylindrical pockets 4a for holding the cylindrical rollers 3 at equal intervals in the circumferential direction, and the cylindrical rollers 3 are arranged at equal intervals in the circumferential direction. .

また、鉄道車両車軸用転がり軸受１０は２個一組で用いられている。そのうち車輪側に配された方の鉄道車両車軸用転がり軸受１０（図１及び図２おいては右側の軸受）の外輪２は、その内周面の軸方向両端部につば５，５を有し、内輪１はその外周面の車輪側端部のみにつば５を有している。また、反車輪側に配された方の鉄道車両車軸用転がり軸受１０（図１及び図２においては左側の軸受）の外輪２は、その内周面の軸方向両端部につば５，５を有し、内輪１はつばを有しておらず反車輪側につば輪６を備えている。尚、このつば輪６は、車軸１５に嵌合された上にロックナット等で固定されている。   In addition, two rolling bearings 10 for rolling stock axles are used as a set. Of these, the outer ring 2 of the rolling bearing 10 for a railway vehicle axle disposed on the wheel side (the right bearing in FIGS. 1 and 2) has flanges 5 and 5 at both axial ends of the inner peripheral surface thereof. The inner ring 1 has a flange 5 only at the wheel side end of the outer peripheral surface thereof. Further, the outer ring 2 of the rolling bearing 10 for rolling stock axle (the bearing on the left side in FIGS. 1 and 2) arranged on the opposite side of the wheel has flanges 5 and 5 at both axial ends of its inner peripheral surface. And the inner ring 1 does not have a collar but has a collar 6 on the side opposite to the wheel. The collar 6 is fitted on the axle 15 and fixed with a lock nut or the like.

そして、鉄道車両車軸用転がり軸受１０，１０の内輪１，１は、レール１２上を走行する車輪１３が備えられた車軸１５の両端に嵌合されており、外輪２，２は鉄道車両の車体（図示せず）を支える台車枠（図示せず）に取り付けられている。これにより、鉄道車両の車軸１５が、車体に対して回転自在に支持されることとなる。   The inner races 1 and 1 of the rolling bearings 10 and 10 for railcar axles are fitted to both ends of an axle 15 provided with wheels 13 that run on the rails 12, and the outer races 2 and 2 are car bodies of the railcar. It is attached to a bogie frame (not shown) that supports (not shown). As a result, the axle 15 of the railway vehicle is supported rotatably with respect to the vehicle body.

本発明では、上記保持器４として、異形断面を有するガラス繊維を合成樹脂に配合した合成樹脂組成物を成形したものを用いる。合成樹脂には制限はないが、耐熱性や耐疲労性等を考慮すると、ポリフェニレンサルファイド、芳香族ポリアミド、ポリアミド４６、ポリアミド６６等が好ましい。ポリフェニレンサルファイドは吸水性が低く、耐熱性に優れ、また成形性が良好であることから、低吸水性で寸法安定性に優れ、１５０〜１８０℃の高温で使用可能な合成樹脂製保持器を射出成形により低コストで形成することができ、将来的に鉄道車両の高速化が進み、更なる温度上昇が見込まれるようになった時点でも使用可能である。また、芳香族ポリアミドは高融点、高強度であり、１２０〜１４０℃での高温での使用が可能である。また、ポリアミド４６も１２０〜１４０℃の耐熱性を有し、樹脂自体の衝撃強度・耐疲労性が高く、合成樹脂製保持器の破損に対して信頼性が向上するため好ましい。また、ポリアミド６６は、耐熱性は１００〜１２０℃であるが、衝撃強度、耐疲労性等のバランスがよく、材料コストも低いため、本発明において合成樹脂製保持器用の樹脂として最も好ましい。また、これら合成樹脂は混合して用いることもできる。   In this invention, what shape | molded the synthetic resin composition which mix | blended the synthetic fiber with the glass fiber which has a deformed cross section as the said holder | retainer 4 is used. Although there is no restriction | limiting in a synthetic resin, when heat resistance, fatigue resistance, etc. are considered, polyphenylene sulfide, aromatic polyamide, polyamide 46, polyamide 66, etc. are preferable. Polyphenylene sulfide has low water absorption, excellent heat resistance, and good moldability. Therefore, it injects a synthetic resin cage that has low water absorption, excellent dimensional stability, and can be used at high temperatures of 150 to 180 ° C. It can be formed at a low cost by molding, and can be used even when the speed of a railway vehicle increases in the future and a further increase in temperature is expected. Aromatic polyamide has a high melting point and high strength, and can be used at a high temperature of 120 to 140 ° C. Polyamide 46 is also preferable because it has a heat resistance of 120 to 140 ° C., the impact strength and fatigue resistance of the resin itself is high, and the reliability is improved against damage to the synthetic resin cage. Polyamide 66 has a heat resistance of 100 to 120 ° C., but has a good balance of impact strength, fatigue resistance and the like, and has a low material cost. Therefore, it is most preferable as a resin for a synthetic resin cage in the present invention. Moreover, these synthetic resins can also be mixed and used.

これら合成樹脂の分子量は、生産性を考慮して、異形断面を有するガラス繊維を含有した状態で射出成形が可能となる分子量とすることが好ましい。具体的には数平均分子量で１３０００〜３００００が好ましく、更に衝撃強度等の機械的強度を考慮すると数平均分子量で１８０００〜２６０００がより好ましい。数平均分子量が１３０００未満では、分子量が低すぎて機械的強度が低く、実用性が低い。これに対して数平均分子量が３００００を越える場合は、異形断面を有するガラス繊維を規定量含有した状態での溶融粘度が高すぎ、精度よく射出成形で製造することが困難になる。   The molecular weight of these synthetic resins is preferably set to a molecular weight that allows injection molding in a state of containing glass fibers having an irregular cross section in consideration of productivity. Specifically, the number average molecular weight is preferably 13,000 to 30000, and further considering the mechanical strength such as impact strength, the number average molecular weight is more preferably 18000 to 26000. When the number average molecular weight is less than 13,000, the molecular weight is too low, the mechanical strength is low, and the practicality is low. On the other hand, when the number average molecular weight exceeds 30000, the melt viscosity in a state where a prescribed amount of glass fiber having a modified cross section is contained is too high, and it becomes difficult to manufacture by injection molding with high accuracy.

異形断面を有するガラス繊維は、ぞの断面形状が円形ではないガラス繊維である。断面形状として例えばまゆ形、楕円、長円等が挙げられる。好ましくは、異形比（長径部と短径部との比率）が１．５〜５であるガラス繊維であり、２〜４であるガラス繊維がより好ましい。異形比が１．５未満では機械的強度の向上等の効果が少なく、異形比が５を越えると扁平すぎて安定して製造するのが難しくなる。また、短径部は５〜１２μｍであることが好ましい。短径部が５μｍ未満では細すぎて製造時に破断、破損するため、低コストで安定した品質を保つのが難しく、実用性が低い。一方、短径部が１２μｍを越える場合は、異形比を考慮すると繊維が太すぎ、樹脂中での分散性に劣るようになり、樹脂部に強度ムラが発生するおそれがある。   A glass fiber having an irregular cross section is a glass fiber having a non-circular cross section. Examples of the cross-sectional shape include eyebrows, ellipses, and ellipses. Preferably, it is a glass fiber having a deformed ratio (ratio of the major axis part to the minor axis part) of 1.5 to 5, and more preferably a glass fiber of 2 to 4. If the profile ratio is less than 1.5, the effect of improving the mechanical strength is small, and if the profile ratio exceeds 5, it is too flat and it is difficult to produce stably. Moreover, it is preferable that a short diameter part is 5-12 micrometers. If the short diameter part is less than 5 μm, it is too thin and breaks or breaks during production. Therefore, it is difficult to maintain a stable quality at low cost, and the practicality is low. On the other hand, when the minor axis exceeds 12 μm, the fiber is too thick in consideration of the deformed ratio, resulting in poor dispersibility in the resin, and unevenness in strength may occur in the resin part.

異形断面を有するガラス繊維の含有量は、樹脂組成物全量の１５〜４５質量％であり、好ましくは２０〜３５質量％である。含有率が１５質量％未満では補強効果が少なく、４５質量％を越える場合は、射出成形に適した流動性が得られなくなるとともに、靭性が低下して成形時の金型からの無理抜き時やころ挿入時に破損するおそれがあり、好ましくない。   Content of the glass fiber which has an irregular cross section is 15-45 mass% of the resin composition whole quantity, Preferably it is 20-35 mass%. When the content is less than 15% by mass, the reinforcing effect is small, and when it exceeds 45% by mass, fluidity suitable for injection molding cannot be obtained, and the toughness is reduced and the mold is forcibly removed from the mold during molding. There is a risk of damage when the roller is inserted, which is not preferable.

本発明で用いる異形断面を有するガラス繊維は、従来の円形断面のガラス繊維に比べて折れ難く、樹脂と混練し、射出成形した時に円形断面のガラス繊維に比べて長い状態で樹脂中に分散する。そのため、同一含有量で比較すると、円形断面のガラス繊維に比べて、機械的強度を高める効果に優れる。また、異形断面を有するガラス繊維は、成形時に保持器表面と平行に面をなすように配向するため、面で荷重を受けることができ、耐荷重性に優れるようになる。更に、径方向にも若干の補強効果が現われ、機械的強度がより高まるとともに、寸法変化の差異が小さくなるためヒケが発生し難くなる。   The glass fiber having a modified cross section used in the present invention is less likely to break than a conventional glass fiber having a circular cross section, and is dispersed in the resin in a longer state than the glass fiber having a circular cross section when kneaded with a resin and injection molded. . Therefore, when compared with the same content, the effect of increasing the mechanical strength is superior to that of glass fibers having a circular cross section. Further, since the glass fiber having an irregular cross section is oriented so as to form a plane parallel to the cage surface at the time of molding, it can receive a load on the plane and has excellent load resistance. Furthermore, a slight reinforcing effect appears in the radial direction, the mechanical strength is further increased, and the difference in dimensional change is reduced, so that sink marks are less likely to occur.

また、異形断面を有するガラス繊維は、上記した樹脂との接着性を考慮して、片末端にエポキシ基やアミノ基等を有するシランカプッリング剤、あるいはエポキシ系、ウレタン系、アクリル系等のサイジング剤で表面処理したものを用いることが好ましい。シランカップシング剤やサイジング剤は、樹脂の種類に応じて選択され、例えば、エポキシ基やアミノ基等を有するシランカップリング剤は、エポキシ基やアミノ基が樹脂のアミド結合に作用して補強効果を向上させる。   In addition, the glass fiber having an irregular cross section is a silane coupling agent having an epoxy group, an amino group or the like at one end, or an epoxy type, urethane type, acrylic type or the like in consideration of adhesiveness with the above-described resin. It is preferable to use a surface-treated product. Silane coupling agents and sizing agents are selected according to the type of resin. For example, silane coupling agents having an epoxy group, amino group, or the like have a reinforcing effect because the epoxy group or amino group acts on the amide bond of the resin. To improve.

尚、異形断面を有するガラス繊維は、得られる樹脂製保持器において、３００〜９００μｍの繊維長を有することが好ましく、３５０〜６００μｍの繊維長であることがより好ましい。繊維長が３００μｍ未満では、補強効果及び寸法安定効果が少なく、好ましくない。一方、樹脂との混練、射出成形を行う過程で９００μｍを越えるような長い繊維状態を維持するのは困難であり、繊維長の上限は製造工程に由来して設定した値である。このような繊維長とするには、混練条件や成形条件を調整すればよい。   The glass fiber having an irregular cross section preferably has a fiber length of 300 to 900 μm, more preferably 350 to 600 μm, in the obtained resin cage. If the fiber length is less than 300 μm, the reinforcing effect and the dimensional stability effect are small, which is not preferable. On the other hand, it is difficult to maintain a long fiber state exceeding 900 μm in the process of kneading with resin and injection molding, and the upper limit of the fiber length is a value set from the manufacturing process. In order to obtain such a fiber length, kneading conditions and molding conditions may be adjusted.

また、異形断面を有するガラス繊維の一部を、炭素繊維等の他の繊維状補強材、あるいはチタン酸カリウムウィスカー等のウィスカー状補強材で代替してもよい。   A part of the glass fiber having an irregular cross section may be replaced with another fibrous reinforcing material such as carbon fiber or a whisker-like reinforcing material such as potassium titanate whisker.

更に、樹脂組成物には着色剤等を添加してもよく、耐熱性が十分ではない樹脂を用いる場合には、成形時及び使用時の熱による劣化を防止するためにヨウ化物系熱安定化剤やアミン系酸化防止剤を、それぞれ単独あるいは併用して添加することが好ましい。また、耐衝撃性を改善するために、エチレンプロピレン非共役ジエンゴム（ＥＰＤＭ）等のゴム状物質を配合してもよい。   Furthermore, a colorant or the like may be added to the resin composition. When a resin having insufficient heat resistance is used, iodide-based heat stabilization is performed to prevent deterioration due to heat during molding and use. It is preferable to add an agent or an amine-based antioxidant alone or in combination. In order to improve the impact resistance, a rubber-like substance such as ethylene propylene non-conjugated diene rubber (EPDM) may be blended.

尚、上記の樹脂、異形断面を有するガラス繊維及びその他の配合物を用いて樹脂製保持器を製造する方法としては、生産性から、射出成形が好ましい。また、保持器も、図１に示す円筒ころ軸受用の他、円すいころ軸受用とすることもできる。   In addition, from the viewpoint of productivity, injection molding is preferred as a method for producing a resin cage using the above-mentioned resin, glass fiber having a modified cross section and other blends. The cage can also be used for a tapered roller bearing in addition to the cylindrical roller bearing shown in FIG.

以下に実施例及び比較例を挙げて本発明を更に説明するが、本発明はこれにより何ら制限されるものではない。   Examples The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited thereby.

（実施例１〜３、比較例１〜２）
表１に示す如く、ポリアミド樹脂及びガラス繊維を用いて樹脂組成物を調製した。尚、樹脂に用いたＰＡ６６は宇部興産（株）製「UBEナイロン2020U（銅系熱安定剤含有）」であり、ＰＡ４６はDJEP社製「Stanyl TW341（銅系熱安定剤含有）」である。また、ガラス繊維については、何れもアミノ系シランカップリング剤処理品であり、実施例１ではまゆ形断面ガラス繊維（日東紡績（株）製「CSH3PA-870」、異形比２、短径１０μｍ、ウレタン系サイジング剤処理）」、実施例２及び実施例３では長円断面ガラス繊維（日東紡績（株）製「CSG3PA-820」、異形比４、短径７μｍ、ウレタン系サイジング剤処理）、比較例１及び比較例２では平均直径約１３μmの円形断面ガラス繊維を用いた。そして、樹脂組成物から引張試験用試験及びアイゾット衝撃試験用試験片を作製し、引張強度及びアイゾット衝撃強度を測定した。結果を表１に示す。 (Examples 1-3, Comparative Examples 1-2)
As shown in Table 1, resin compositions were prepared using polyamide resin and glass fibers. PA66 used for the resin is “UBE nylon 2020U (containing copper heat stabilizer)” manufactured by Ube Industries, Ltd., and PA46 is “Stanyl TW341 (containing copper heat stabilizer)” manufactured by DJEP. Further, the glass fibers are all treated with an amino-based silane coupling agent. In Example 1, eyebrows-shaped cross-section glass fibers (“CSH3PA-870” manufactured by Nitto Boseki Co., Ltd., variant ratio 2, minor axis 10 μm, Urethane-based sizing agent treatment) ”, in Examples 2 and 3, long-section glass fiber (“ CSG3PA-820 ”manufactured by Nitto Boseki Co., Ltd., deformed ratio 4, short diameter 7 μm, urethane-based sizing agent treatment), comparison In Example 1 and Comparative Example 2, circular cross-section glass fibers having an average diameter of about 13 μm were used. And the test piece for a tensile test and an Izod impact test were produced from the resin composition, and the tensile strength and the Izod impact strength were measured. The results are shown in Table 1.

Figure 2008025759
Figure 2008025759

表１に示すように、異形断面を有するガラス繊維を配合することで、円形断面を有するガラス繊維を配合した場合に比べて機械的強度が大幅に向上することがわかる。   As shown in Table 1, it can be seen that by blending glass fibers having an irregular cross section, the mechanical strength is significantly improved as compared with the case of blending glass fibers having a circular cross section.

また、上記の実施例２及び比較例１の配合からなる樹脂組成物を用い、射出成形により、内径１７３ｍｍ、外径２０３ｍｍ、厚さ７０ｍｍのころ軸受用保持器を作製した。得られた保持器の表面を観察し、ヒケの発生を確認した。結果を表２に示す。   In addition, a roller bearing cage having an inner diameter of 173 mm, an outer diameter of 203 mm, and a thickness of 70 mm was produced by injection molding using the resin composition having the composition of Example 2 and Comparative Example 1 described above. The surface of the obtained cage was observed to confirm the occurrence of sink marks. The results are shown in Table 2.

更に、得られた保持器に、２３℃にて、８０ＭＰａの応力を周波数３０Ｈｚで繰り返し加え、破損に至るまでの回数を測定した。結果を表２に、比較例１に対する相対値で示す。   Furthermore, 80 MPa of stress was repeatedly applied to the obtained cage at 23 ° C. at a frequency of 30 Hz, and the number of times until breakage was measured. The results are shown in Table 2 as relative values with respect to Comparative Example 1.

Figure 2008025759
Figure 2008025759

表２に示すように、異形断面を有するガラス繊維を配合することで、成形に伴うヒケの発生が抑えられ、得られる保持器の外観が向上するとともに、耐疲労性も大幅に向上することがわかる。   As shown in Table 2, by blending glass fibers having an irregular cross section, the occurrence of sink marks associated with molding can be suppressed, the appearance of the resulting cage can be improved, and the fatigue resistance can be greatly improved. Recognize.

以上の結果から、異形断面を有するガラス繊維を配合した樹脂組成物からなる樹脂製保持器を備える鉄道車両車軸用転がり軸受は、信頼性のより高いものとなることがわかる。   From the above results, it can be seen that a rolling bearing for a railway vehicle axle provided with a resin cage made of a resin composition blended with a glass fiber having an irregular cross section has higher reliability.

鉄道車両車軸用転がり軸受の構造を示す部分縦断面図である。It is a fragmentary longitudinal cross-section which shows the structure of the rolling bearing for railway vehicle axles. 図１の鉄道車両車軸用転がり軸受で車軸を支持された鉄道車両の一部分を示す図である。It is a figure which shows a part of railway vehicle by which the axle shaft was supported by the rolling bearing for railcar axles of FIG.

符号の説明Explanation of symbols

１ 内輪
２ 外輪
３ 円筒ころ（転動体）
４ 保持器
１０ 鉄道車両車軸用転がり軸受
１５ 車軸 1 Inner ring 2 Outer ring 3 Cylindrical roller (rolling element)
4 Cage 10 Rolling bearing for rolling stock axle 15 Axle

Claims (1)

少なくとも内輪、外輪、合成樹脂製保持器及びころを備える鉄道車両車軸用転がり軸受において、
前記合成樹脂製保持器が、異形断面を有するガラス繊維を１５〜４５質量％の割合で含有する合成樹脂組成物からなることを特徴とする鉄道車両車軸用転がり軸受。 In rolling bearings for rolling stock axles comprising at least an inner ring, an outer ring, a synthetic resin cage and rollers,
The rolling bearing for a railway vehicle axle, wherein the synthetic resin cage is made of a synthetic resin composition containing glass fibers having an irregular cross section at a ratio of 15 to 45 mass%.
JP2006200497A 2006-07-24 2006-07-24 Rolling bearing for railway vehicle axle Pending JP2008025759A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08259808A (en) * 1995-03-22 1996-10-08 Mitsubishi Eng Plast Kk Polyamide-resin made vibration-fused hollow formed article
JP2002206053A (en) * 2001-01-10 2002-07-26 Idemitsu Petrochem Co Ltd Polycarbonate resin composition and molding thereof
JP2005061483A (en) * 2003-08-08 2005-03-10 Nsk Ltd Cage made out of synthetic resin for roller bearing, and roller bearing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08259808A (en) * 1995-03-22 1996-10-08 Mitsubishi Eng Plast Kk Polyamide-resin made vibration-fused hollow formed article
JP2002206053A (en) * 2001-01-10 2002-07-26 Idemitsu Petrochem Co Ltd Polycarbonate resin composition and molding thereof
JP2005061483A (en) * 2003-08-08 2005-03-10 Nsk Ltd Cage made out of synthetic resin for roller bearing, and roller bearing

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