US 12,221,908 B2
Sound reducing device for internal combustion engine
Yuta Urushibara, Tokyo (JP); Hiroshi Sakai, Tokyo (JP); Tetsuya Hiraide, Tokyo (JP); and Tomohiko Nozaki, Tokyo (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
Filed on Nov. 13, 2023, as Appl. No. 18/507,895.
Claims priority of application No. 2022-184344 (JP), filed on Nov. 17, 2022.
Prior Publication US 2024/0167398 A1, May 23, 2024
Int. Cl. F01L 1/02 (2006.01); F02B 75/22 (2006.01); F02F 7/00 (2006.01); F01L 1/053 (2006.01)
CPC F01L 1/024 (2013.01) [F02B 75/22 (2013.01); F02F 7/008 (2013.01); F01L 2001/0537 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A sound reducing device for an internal combustion engine that includes a crankshaft rotatably supported by an engine main body, a camshaft rotatably supported by the engine main body, a timing belt passed around a crank pulley fitted to the crankshaft and a cam pulley fitted to the camshaft, and a belt cover attached to the engine main body to define a belt chamber for accommodating the timing belt therein jointly with the engine main body, the sound reducing device comprising a chamber forming member defining a sound reducing chamber having a prescribed column length jointly with the belt cover,
wherein the sound reducing chamber communicates with the belt chamber via an opening,
the opening opposes a part of the timing belt passed around the cam pulley, and
the sound reducing chamber extends from the opening while being curved in shape so as to overlap with the cam pulley as viewed in an axial direction with respect to the camshaft.