Sound reducing device for internal combustion engine
AssigneeHonda Motor Co., Ltd.
InventorsYuta Urushibara, Hiroshi Sakai, Tetsuya Hiraide, Tomohiko Nozaki
Life of this patent
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Abstract
A sound reducing device (30) for an internal combustion engine (1, 101) comprises a chamber forming member (33) defining a sound reducing chamber (32) having a prescribed column length jointly with a belt cover, and the sound reducing chamber communicates with the belt chamber via an opening (31), and the opening opposes a part of a timing belt passed around the cam pulley.
Claims10
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.
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,
- the sound reducing chamber is one of a pair of sound reducing chambers having respective openings and different column lengths corresponding to different frequency bands,
- the camshaft is one of a pair of camshafts for intake and exhaust, respectively, each camshaft is fitted with a corresponding cam pulley,
- one of the sound reducing chambers extends from the opening thereof while being curved in shape so as to overlap with one of the cam pulleys as viewed in an axial direction with respect to the camshafts, and
- another of the sound reducing chambers extends from the opening thereof while being curved in shape so as to overlap with another of the cam pulleys as viewed in the axial direction with respect to the camshafts.
Dependencies are inferred from the claim text.