Valve device

摘要

A valve device has a valve that opens and closes a passage, and a cantilever bearing member rotatably supporting a rotating shaft of the valve. The cantilever bearing member has rolling-element bearings arranged in series in an axial direction of the rotating shaft. One of the rolling-element bearings located the closest to the passage has a rolling element, an inner race, an outer race and a seal portion. A space is defined between the inner race and the outer race to receive the rolling element. The seal portion made of rubber tightly seals the space on a side adjacent to the passage.

主权项

1. A valve device comprising:
a valve that opens and closes a passage; and a cantilever bearing member that rotatably supports a rotating shaft of the valve on only one side of the passage, wherein the cantilever bearing member has a plurality of rolling-element bearings that are arranged in series in an axial direction of the rotating shaft to be directly adjacent to each other, one of the plurality of rolling-element bearings is located the closest to the passage among the plurality of rolling-element bearings, and the rolling-element bearing that is located closest to the passage has a rolling element, an inner race and an outer race between which a space is defined to receive the rolling element, and a seal portion made of rubber and steel, such that the seal portion is configured to tightly seal the space on a side adjacent to the passage, wherein the rubber contacts both the inner race and the outer race.