Patent ID: 9689422
Date: 2017-06-27
CPC Classifications: F01D,F02B,F02C,F05D,F16C,Y02T

Claim:
1. A foil bearing unit, comprising: a first foil holder formed of a single component; a second foil holder mounted to the first foil holder; a spacer arranged axially between the first foil holder and the second foil holder; a radial bearing foil mounted to an inner peripheral surface of the first foil holder; a thrust bearing foil mounted to an end surface of the first foil holder; another thrust bearing foil mounted to an end surface of the second foil holder; and an inner member, wherein the inner member comprises: the inner member is supported in a radial direction by a fluid pressure that is generated in a radial bearing gap between a bearing surface of the radial bearing foil and an outer peripheral surface of the shaft portion, the inner member is further supported in a thrust direction by a fluid pressure that is generated in a thrust bearing gap between a bearing surface of the thrust bearing foil and one end surface of the flange portion, the inner member is additionally supported in a thrust direction by a fluid pressure that is generated in a thrust bearing gap between another end surface of the flange portion of the inner member and a bearing surface of the another thrust bearing foil, the spacer has a communication hole formed to communicate an inner periphery and an outer periphery of the spacer to each other, and a communication path is formed between the inner peripheral surface of the hollow sleeve portion and an outer peripheral surface of the rotary shaft, the communication path being configured to communicate the radial bearing gap and an outside to each other.