Internal combustion engine having a choke flap arranged in an air filter housing
US6401672B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2001 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Mar 1, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a two-stroke engine in a portable handheld work apparatus. A combustion chamber (3) is formed in a cylinder (2) and the chamber is delimited by a piston (5). At least one transfer channel (14) is provided which connects the crankcase (4) to the combustion chamber (3). An air channel (22) opens into the transfer channel (14) and this channel supplies essentially fuel-free gas, preferably air. The intake channel (28) of a carburetor (8) is connected to an intake opening (45) in the housing base (41) of the air filter housing (43) upstream of a carburetor throttle flap. The intake channel (28) connects downstream of the carburetor throttle flap to an intake channel (9) to the crankcase (4). To provide an ignition-ready mixture in order to start and run up the engine, it is provided that the air channel (22) is connected to a bypass opening (25) in the housing base (41) of the air filter (42) and a common pivotable choke element (24) is assigned to the intake opening (45) as well as the bypass opening (25). The choke element (24) clears the openings (25, 45) in the operating position and closes the passthrough cross section of the bypass opening (25) in the sta…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.