Connecting piece

摘要

A connecting piece ( 1 ) between a carburetor ( 4 ) and an inlet channel ( 3 ) is disposed in an internal combustion engine ( 2 ) of a portable handheld motor-driven work apparatus such as a motor-driven chain saw, cutoff machine, et cetera. The connecting piece ( 1 ) serves to compensate for relative position changes between the engine ( 2 ) and the carburetor ( 4 ). The connecting piece ( 1 ) is made of elastic material and has an expansion fold ( 5 ) which functions to compensate for length changes. The length of the connecting piece can be changed from a pressed length (a) to an expanded length (b). The expansion fold ( 5 ) partitions the connecting piece ( 1 ) into a carburetor-end section ( 6 ) and into an engine-end section ( 7 ). The carburetor-end section ( 6 ) includes a circularly-shaped flow cross section and the engine-end section ( 7 ) includes a circularly-shaped flow cross section at the side facing toward the expansion fold ( 5 ) and has a flow cross section which departs from the circular shape at the end facing toward the engine. The connecting piece ( 1 ) includes on the inner side grooves ( 24 ) which run in the longitudinal direction.