Air-cooled engine and engine working machine
AssigneeHitachi Koki Co., Ltd.
InventorsNaoto ICHIHASHI, Takefumi KAWAGUCHI, Jun KUGENUMA
Life of this patent
Estimating the term…
Abstract
An air-cooled engine includes a muffler that is attached to an exhaust port of a cylinder and a fan case that houses a cooling fan, and a cylinder cooling room is formed by a cylinder cover that houses the cylinder. A muffler cooling room is formed by a first muffler cover that covers at least some of the muffler through a clearance and a second muffler cover that covers at least some of the first muffler cover through a clearance. Some of cooling air generated by the cooling fan is supplied to the muffler cooling room. The cooling air is supplied to at least one of a first space between the muffler and the first muffler cover and a second space between the first muffler cover and the second muffler cover.
Claims13
An air-cooled engine comprising:
- a cylinder;
- a crank case that is attached to the cylinder and rotatably supports a driving shaft;
- a cooling fan that is attached to the driving shaft;
- a muffler that is attached to an exhaust port of the cylinder and exhausts exhaust gas passing inside from an exhaust exit;
- a fan case that covers the cooling fan;
- a cylinder cover that covers the cylinder to form a cylinder cooling room;
- and a muffler cover that covers the muffler to form a muffler cooling room, the air-cooled engine characterized in that
- the muffler cover includes a first muffler cover that covers at least some of the muffler and a second muffler cover that covers at least some of the first muffler cover, and some of cooling air generated by the cooling fan is supplied to at least one of a first space between the muffler and the first muffler cover and a second space between the first muffler cover and the second muffler cover, and
- an air guiding portion is provided inside the muffler cover, the air guiding portion guiding cooling air that is supplied to the first space or the second space to an exhaust exit side of the muffler.
An air-cooled engine comprising:
- a cylinder;
- a crank case that is attached to the cylinder and rotatably supports a driving shaft;
- a cooling fan that is attached to the driving shaft;
- a muffler that is attached to an exhaust port of the cylinder and exhausts exhaust gas passing inside from an exhaust exit;
- a fan case that covers the cooling fan;
- a cylinder cover that covers the cylinder to form a cylinder cooling room;
- and a muffler cover that covers the muffler to form a muffler cooling room, the air-cooled engine characterized in that
- the muffler cover includes a first muffler cover that covers at least some of the muffler and a second muffler cover that covers at least some of the first muffler cover, and some of cooling air generated by the cooling fan is supplied to both of a first space between the muffler and the first muffler cover and a second space between the first muffler cover and the second muffler cover.
Dependencies are inferred from the claim text.