| 摘要 |
PCT No. PCT/SE97/00572 Sec. 371 Date Dec. 14, 1998 Sec. 102(e) Date Dec. 14, 1998 PCT Filed Apr. 4, 1997 PCT Pub. No. WO97/38217 PCT Pub. Date Oct. 16, 1997The invention refers to a cylinder (1) for a two-stroke internal combustion engine intended for a handheld working tool, preferably a chain saw, and the exhaust duct (2) and transfer ducts (3, 4) of the cylinder are symmetrically arranged around a mutual symmetry plane (5) which follows the centre line (6) of the cylinder, and at the mouth (7) of the exhaust duct (2) outside the cylinder, a mounting plane (8) with mounting holes (9) for a directly mounted muffler, is arranged. According to the invention, at least one inlet port (11) is located in the cylinder wall (12) and/or in an adjacent crankcase half (10), and the cylinder's in let duct (13) up to the inlet port (11) is so arranged that it forms a fixed and heat-conducting part of the cylinder, and has a length longer than 0.8 times the diameter (14) of the cylinder, preferably longer than 10 times the diameter.
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