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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2018/088231
Kind Code:
The muffler 1 comprises: an expansion part 20 having a discharge port 22 and defining an expansion chamber 21 therein; an acoustic element having a finite-length guide tube 10 defining a guide chamber 11 therein; a connection part 30 provided with a communication hole 32 for providing communication between the expansion chamber 21 and the guide chamber 11; and a check valve 5 for preventing back-flow of compressed air flowing from the guide chamber 11 into the expansion chamber 21 through the communication hole 32. The check valve 5 comprises: a valve seat 33 disposed on the connection part 30; a valve body 25 for closing the communication hole 32 by coming into contact with the valve seat 33; and a spring 26 for biasing the valve body 25 toward the valve seat 33. The valve body 25 comprises: tapered part 25a disposed on the peripheral part of the valve body as the portion that will abut the valve seat 33, having a shape tapering toward the valve seat 33; a flat part 25b disposed on the inner side of the tapered part 25a; and a recessed part 25c disposed on the opposite side of the valve body from the side facing the valve seat 33.

KIKUCHI, Masahiro
Application Number:
Publication Date:
May 17, 2018
Filing Date:
October 26, 2017
Export Citation:
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KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.) (2-4 Wakinohama-Kaigandori 2-chome, Chuo-ku Kobe-sh, Hyogo 85, 〒6518585, JP)
International Classes:
F04B39/10; F01N1/02; F04B39/00; F16K1/34; F16K15/02
Foreign References:
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (AOYAMA & PARTNERS, Umeda Hankyu Bldg. Office Tower 8-1, Kakuda-cho, Kita-ku, Osaka-sh, Osaka 17, 〒5300017, JP)
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