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.

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.

Abstract: An engine blower includes a muffler (9) provided to an engine and a volute case (31) accommodating a fan driven by the engine. On a muffler main body (10) of the muffler (9), an exhaust-gas guide member (21) covering an exhaust-gas outlet port and a cover hood (22) covering the exhaust-gas guide member (21) on the side of the outlet port are provided. Between the exhaust-gas guide member (21) and the cover hood (22), an outside-air introduction gap (23) is formed, through which outside air is introduced into the cover hood (22) by ejector effects. A blow-off port (32) for blowing off a part of pressure air in the volute case (31) to the outside-air introduction port (23) is only provided at a position substantially on a back side of the outside-air introduction gap (23).