润滑科技信息平台

专利摘要

提供一种具有低扭矩特性和优异的轴承寿命的车轴轴承。轮毂轴承 6 被配置为可旋转地支撑车辆的车轮,并且具有润滑脂组合物 10 密封在其内部空间中。润滑脂成分 10 含有基础油和增稠剂。润滑脂组合物在剪切速率1,000-10,000 s时的剪切应力 −1 25℃时为3,000Pa以下。润滑脂组合物的粘度为1Pa·s以下。通过使用流变仪的动态粘弹性分析法测定的润滑脂组合物在25℃下的屈服应力为1,300~3,000Pa。 ......

基本信息

专利类型:
发明专利
申请/专利号:
US17/767891
申请日期:
专利申请人:
分类号:
["F16C19/18","C10M107/02","C10M115/08","C10M169/00","C10M169/02","C10M169/04","F16C33/66","C10N20/02"]
发明/设计人:
KAWAMURA, TAKAYUKI ， KONDOU, RYOUTA ， SEKI, MAKOTO ， YAMAJI, SUSUMU
权利要求: 1. An axle bearing that is configured to rotatably support a wheel of a vehicle or an axle connected to the wheel, the axle bearing comprising a grease composition sealed in an inner space of the axle bearing,wherein:the grease composition contains a base oil and a thickener,the shear stress of the grease composition at the shear rate of 1,000-10,000 s−1 at 25° C. is 3,000 Pa or less, the viscosity of the grease composition is 1 Pas or less, andthe yield stress of the grease composition at 25° C. measured by a dynamic viscoelasticity analysis method using a rheometer is 1,300-3,000 Pa.2. The axle bearing as defined in claim 1, wherein:the thickener is a diurea compound obtained by causing a diisocyanate component and a monoamine component to react with each other, andthe monoamine component includes aliphatic monoamine and alicyclic monoamine.3. The axle bearing as defined in claim 2, wherein the alicyclic monoamine contains dicyclohexylamine.4. The axle bearing as defined in claim 1, wherein:the base oil contains synthetic hydrocarbon oil as a main component, andthe dynamic viscosity of the base oil at 40° C. is 30-80 mm2/s.5. The axle bearing as defined in claim 1, the axle bearing being configured as a hub bearing that rotatably supports a wheel of a vehicle,wherein:the hub bearing comprising: an outer member having double-row outer raceway surfaces on an inner periphery; an inner member having double-row inner raceway surfaces on an outer periphery, the double-row inner raceway surfaces respectively facing the double-row outer raceway surfaces; double-row rolling elements housed between the inner raceway surfaces and the outer raceway surfaces; and the grease composition sealed around the rolling elements,the inner member comprises a hub wheel and an inner ring,the hub wheel has: a wheel mount flange integrally formed on one end portion of the hub wheel; one of the inner raceway surfaces that faces one of the double-row outer raceway surfaces and that is formed on an outer periphery of the hub wheel; and a small diametrical stepped portion that extends from the inner raceway surface in an axial direction,the inner ring has the other one of the inner raceway surfaces that faces the other one of the double-row outer raceway surfaces and that is formed on an outer periphery of the inner ring, andthe inner ring is press-fitted onto the small diametrical stepped portion of the hub wheel and is fixed to the hub wheel using a swaging portion that is formed by plastically deforming an end portion of the small diametrical stepped portion toward a radially outer side.6. The axle bearing as defined in claim 5, the axle bearing being configured to be used in a rotation speed range of 1,000 min−1 or less.7. A grease composition comprising a base oil and a thickener,wherein:the shear stress of the grease composition at the shear rate of 20,000 s−1 at 25° C. is 0.2 Pa or less, andthe yield stress of the grease composition at 25° C. measured by a dynamic viscoelasticity analysis method using a rheometer is 1,600 Pa or more.8. The grease composition as defined in claim 7, wherein:the thickener is a diurea compound obtained by causing a diisocyanate component and a monoamine component to react with each other, andthe monoamine component includes aliphatic monoamine and alicyclic monoamine.9. The grease composition as defined in claim 8, wherein the alicyclic monoamine contains dicyclohexylamine.10. The grease composition as defined in claim 7, wherein:the base oil contains synthetic hydrocarbon oil as a main component, andthe dynamic viscosity of the base oil at 40° C. is 30-80 mm2/s.11. A rolling ball bearing comprising:an inner ring;an outer ring;a ball interposed between the inner ring and the outer ring;a resin cage that retains the ball; anda grease composition sealed around the ball, the grease composition being defined in claim 7.12. The rolling ball bearing as defined in claim 11, the rolling ball bearing being configured to be used in a rotation speed range of 2,000 min−1 or less.