Oil seal

摘要

An oil seal (1) having an installation section (2) attached to a housing (21) and a seal lip (4) in slidable contact with the peripheral surface of a shaft (23), wherein the function of supplying lubricating oil to a portion on which the seal lip (4) slides is enhanced to improve durability of the seal lip (4). To achieve this, a lubricating oil supply section (11) for dropping adhered oil on to the shaft (23) is provided at a head portion of the installation section (2). The lubricating oil supply section (11) has projections (12) formed on the inner peripheral surface of the installation section (2), and the oil is collected on the surface of the projections (12). On the surface of each projection (12), there is formed either of a recess (13) for temporarily containing the oil and a guidance projection or a slope for collecting the oil. Also, a dam is formed on a head surface (2a) of the installation section (2) , and the dam backs up the oil flowing down along the circumferential direction on the tip surface (2a) and guides the oil toward each projection (12).