US 11,732,607 B2
Bearing structure, turbocharger having the same, and assembly method of turbocharger
Taiyo Shirakawa, Nagasaki (JP); Yasuhiro Wada, Nagasaki (JP); Yukihiro Iwasa, Nagasaki (JP); and Tetsuya Matsuo, Nagasaki (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES MARINE MACHINERY & EQUIPMENT CO., LTD., Nagasaki (JP)
Appl. No. 17/430,562
Filed by MITSUBISHI HEAVY INDUSTRIES MARINE MACHINERY & EQUIPMENT CO., LTD., Nagasaki (JP)
PCT Filed Jan. 28, 2020, PCT No. PCT/JP2020/002954
§ 371(c)(1), (2) Date Aug. 12, 2021,
PCT Pub. No. WO2020/166318, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 2019-024518 (JP), filed on Feb. 14, 2019.
Prior Publication US 2022/0127972 A1, Apr. 28, 2022
Int. Cl. F01D 25/16 (2006.01); F02B 37/00 (2006.01); F02B 39/00 (2006.01); F16C 17/10 (2006.01); F16C 23/04 (2006.01)
CPC F01D 25/162 (2013.01) [F02B 37/00 (2013.01); F02B 39/00 (2013.01); F16C 17/10 (2013.01); F16C 23/04 (2013.01); F05D 2220/40 (2013.01); F05D 2230/60 (2013.01); F05D 2240/52 (2013.01); F05D 2240/54 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A turbocharger comprising:
an impeller;
a rotary shaft to which the impeller is attached; and
a bearing structure that supports the rotary shaft,
wherein the rotary shaft comprises a small diameter portion, a large diameter portion, and a step part connecting the small diameter portion to the large diameter portion,
wherein the bearing structure comprises
a sleeve provided so as to surround an outer circumference of the rotary shaft that rotates about a center axis line and configured to rotate together with the rotary shaft,
collars provided so as to abut against both ends in the center axis line direction of the sleeve, respectively, having a larger diameter than the sleeve, and configured to rotate together with the rotary shaft, and
a bearing arranged on an outer circumference side of the sleeve and between the collars,
wherein the bearing functions as a journal bearing that supports the rotary shaft primarily in a radial direction via the sleeve and functions as a thrust bearing that supports the rotary shaft in a thrust direction via the collars,
wherein the sleeve and the collars are provided on the small diameter portion, and
wherein one of the collars on the large diameter portion side is provided so as to abut against the step part,
the turbocharger further comprising:
a fastener that is attached to an end of the rotary shaft on the small diameter portion side and presses the collars and the sleeve toward the step part side; and
a journal bearing provided on the large diameter portion,
wherein the sleeve has substantially the same outer diameter as the large diameter portion.