SEALED ROLLING BEARING

摘要

In a sealed rolling bearing for use in an environment where a large amount of water is splashed and the internal pressure of the bearing becomes negative, a ratio of the difference between an outer diameter of a seal sliding contact surface of an inner race and an inner diameter of a seal lip of an elastic seal member in its natural state to a diameter of a roll neck portion (shaft) on which the inner race is fitted is in the range of 0.27 to 0.40%. This provides reduced frictional heat generation of the seal lip and adequate pressing force applied to the seal lip, thus securing excellent seal performance without requiring an additional mechanism, such as a vent to a contact seal.

主权项

1. A sealed rolling bearing comprising:
an outer race; an inner race; and contact seals fixed to the outer race, the contact seals each including: an annular elastic seal member; and a seal lip formed on an inner periphery of the elastic seal member, wherein the seal lip is pressed tightly against a seal sliding contact surface provided on the inner race such that a bearing space defined between the inner race and the outer race is sealed, wherein a ratio of a difference between an outer diameter of the seal sliding contact surface and an inner diameter of the seal lip in a natural state to a diameter of a shaft on which the inner race is fitted is in a range of 0.27 to 0.40%.