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US 7,726,443 B2Granted
Muffler and working machine
AssigneeHusovarna Zenoah Co., Ltd.
InventorsKoue Miyazawa, Naomi Mizuno
Life of this patent
Estimating the term…
Abstract
A muffler of a work machine in the form of an engine blower includes: a muffler body; and a diffuser that covers an exhaust outlet of exhaust gas provided on the muffler body. The diffuser has a diffusion space to diffuse the exhaust gas and an exhaust surface on which a plurality of exhaust circular holes are provided to exhaust the exhaust gas to an outside. An opening ratio provided by the exhaust holes of the exhaust surface is gradually increased from a portion corresponding to the exhaust opening toward an outer periphery of the exhaust surface.
Claims20
A muffler, comprising:
- a muffler body adapted to be attached to an engine and receive exhaust gas from the engine, the muffler body including an exhaust outlet through which exhaust gas received from the engine flows outward;
- and
- a diffuser that covers the exhaust outlet of exhaust gas provided on the muffler body such that the exhaust gas passes into the diffuser, the diffuser being arranged to lower a temperature of the exhaust gas as the exhaust gas passes therethrough,
- wherein the diffuser includes a diffusion space to diffuse the exhaust gas passing therethrough, and an exhaust surface on which a plurality of exhaust holes for exhausting the diffused exhaust gas are formed, the exhaust surface facing the exhaust outlet, and
- wherein an opening rate provided by the exhaust holes of the exhaust surface is gradually increased toward an outer periphery of the exhaust surface from a portion of the exhaust surface opposite the exhaust outlet.
2 more elements
A work machine, comprising:
- (i) an engine;
- (ii) a muffler attached to the engine, the muffler comprising:
- a muffler body adapted to be attached to the engine and receive exhaust gas from the engine, the muffler body including an exhaust outlet through which exhaust gas received from the engine flows outward;
- and
- a diffuser that covers the exhaust outlet of exhaust gas provided on the muffler body such that the exhaust gas passes into the diffuser, the diffuser being arranged to lower a temperature of the exhaust gas as the exhaust gas passes therethrough,
- wherein the diffuser includes a diffusion space to diffuse the exhaust gas passing therethrough, and an exhaust surface on which a plurality of exhaust holes for exhausting the diffused exhaust gas are formed, the exhaust surface facing the exhaust outlet, and
- wherein an opening rate provided by the exhaust holes of the exhaust surface is gradually increased toward an outer periphery of the exhaust surface from a portion of the exhaust surface opposite the exhaust outlet;
- and
- (iii) an engine cover that covers the engine and the muffler, wherein the engine cover is provided with an exhaust opening at a position opposite the exhaust outlet of the muffler body to exhaust the exhaust gas to outside of the engine cover.
6 more elements
Dependencies are inferred from the claim text.