US 11,852,058 B2
Silencing apparatus and method for manufacturing silencing apparatus
Hidetoshi Sugimoto, Isesaki (JP); and Kunitaka Yamauchi, Isesaki (JP)
Assigned to SANKEI GIKEN KOGYO CO., LTD., Tokyo (JP)
Appl. No. 17/435,564
Filed by SANKEI GIKEN KOGYO CO., LTD., Tokyo (JP)
PCT Filed Feb. 7, 2020, PCT No. PCT/JP2020/004996
§ 371(c)(1), (2) Date Sep. 1, 2021,
PCT Pub. No. WO2020/179363, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 2019-040318 (JP), filed on Mar. 6, 2019.
Prior Publication US 2022/0065144 A1, Mar. 3, 2022
Int. Cl. F01N 1/04 (2006.01); G10K 11/162 (2006.01)
CPC F01N 1/04 (2013.01) [G10K 11/162 (2013.01); F01N 2310/02 (2013.01); F01N 2450/06 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A silencing apparatus comprising:
a shell;
a first annular closing member;
a first ventilation pipe communicating with an inside of the shell;
a first insertion hole formed in the shell so as to have a size smaller than a surrounding skirt part, the first insertion hole allowing the first ventilation pipe to be loosely inserted in; and
a first partition partitioning the inside of the shell, wherein
the first annular closing member includes an annular base plate, an inner cylinder part, and an outer cylinder part,
the first annular closing member has a cap-like shape in which the inner cylinder part rises from an inner edge of the annular base plate, and the outer cylinder part rises from an outer edge of the annular base plate, extending towards an opposite side of the inner cylinder part,
the inner cylinder part is arranged along an outer circumference of the first ventilation pipe and is fixed to the first ventilation pipe, and the outer cylinder part is arranged along an outer circumference of the shell and is fixed to the shell,
a first sound-absorbing chamber partitioned by the first partition and positioned adjacent to the first insertion hole is filled with a sound-absorbing fiber material, and
a first sound-absorbing fiber material filling gap between a peripheral edge of the first insertion hole and the first ventilation pipe is closed by the first annular closing member.