CYLINDER BORE FOR A CYLINDER HOUSING OF AN INTERNAL COMBUSTION ENGINE, AND ARRANGEMENT CONSISTING OF SUCH A CYLINDER BORE AND A PISTON

摘要

The invention relates to a cylinder bore (10, 110) with a cylinder running surface (14, 114) for a cylinder housing of an internal combustion engine. An upper reversal point (OS) and a lower reversal point (US) are defined in the cylinder bore (10, 110). A piston (20) which is moved up and down in the cylinder bore (10, 110) and has piston rings (21) and a piston shaft (22) reaches a speed (V₀) which is almost zero at the reversal points when the motor is being operated, and the piston (20) reaches a maximum speed (V_max) in a region (15, 115) between the upper reversal point (OS) and the lower reversal point (US) when the motor is being operated. The invention is characterized in that at least two circumferential depressions (18a, 18b; 118a, 118b, 118c) are formed within the region (15, 115), and the diameter (D2a, D2b, D2c) of the depressions is greater than the diameter (D1) of the cylinder bore (10, 110) above the region (15, 115) and greater than the diameter (D3) below the region (15, 115).