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US 9,091,239 B2Granted
Engine having displaceable elastic film
AssigneeMakita Corporation
InventorsTakuya Sumi, Ryosuke Ito
Life of this patent
Estimating the term…
Abstract
An engine includes: a piston; a carburetor having a diaphragm fuel pump, the diaphragm fuel pump including a pump chamber configured to suck and discharge fuel and a diaphragm chamber to which a pressure to drive the pump chamber is applied; and a communicating passage configured to connect between the diaphragm chamber and a negative pressure part in which a negative pressure is created due to movement of the piston. A flowback prevention part is formed in the communicating passage to allow fluid to move only in on direction from the diaphragm chamber to the negative pressure part.
Claims10
An engine, comprising:
- a piston;
- a carburetor;
- an elastic film;
- a first chamber formed in one side of the elastic film;
- a second chamber formed in the other side of the elastic film;
- and
- a diaphragm fuel pump provided in the carburetor, the diaphragm fuel pump including:
- a pump chamber configured to suck and discharge fuel;
- and
- a diaphragm chamber to which a pressure to drive the pump chamber is applied,
- wherein:
- the first chamber communicates with a pressure fluctuation part in which there is pressure fluctuation due to movement of the piston;
- the pressure fluctuation part being a crank chamber;
- the second chamber communicates with the diaphragm chamber;
- and
- the elastic film is displaced with the pressure fluctuation in the crank chamber to communicate the pressure fluctuation to the diaphragm chamber via fluid or air in the second chamber.
13 more elements
Dependencies are inferred from the claim text.