Cylinder with multiple transfer ports for an internal combustion engine

摘要

A cylinder comprises a cylinder axis, a cylindrical wall, and an exhaust port defined in the wall. At least one central transfer port and at least two side transfer ports are defined in the wall. Each of the at least one central transfer port and each of the at least two side transfer ports has a transfer channel extending therefrom. For each of the at least one central transfer port, an angle about the cylinder axis between a center of the central transfer port and a center of the exhaust port is greater than 135° and less than or equal to 180°. For each of the at least two side transfer ports, an angle about the cylinder axis between a center of the side transfer port and the center of the exhaust port is less than or equal to 135°. Engines and cylinder blocks are also disclosed.

主权项

1. A cylinder for an internal combustion engine, the cylinder comprising:
a cylinder axis; a cylindrical wall; an exhaust port defined in the cylindrical wall; a first plane containing the cylinder axis and a center of the exhaust port; at least one central transfer port defined in the cylindrical wall,
each of the at least one central transfer port having a transfer channel extending therefrom,for each of the at least one central transfer port, an angle about the cylinder axis between a center of the central transfer port and the center of the exhaust port being greater than 135° and less than or equal to 180°; and at least two side transfer ports defined in the cylindrical wall,
each of the at least two side transfer ports having a transfer channel extending therefrom,for each of the at least two side transfer ports, an angle about the cylinder axis between a center of the side transfer port and the center of the exhaust port being less than or equal to 135°,the at least two side transfer ports including a left side transfer port and a right side transfer port disposed circumferentially symmetrically with respect to the exhaust port,for each of the left side transfer port and the right side transfer port, a corresponding transfer channel being defined in part by a side transfer channel wall extending away from a corresponding one of the left side transfer port and the right side transfer port and extending in a direction parallel to the first plane containing the cylinder axis and a center of the exhaust port,the exhaust port being disposed at least in part between the side transfer channel wall extending from the left side transfer port and the side transfer channel wall extending from the right side transfer port such that a second plane extending parallel to the cylinder axis and containing a left edge of the exhaust port and a right edge of the exhaust port intersects the side transfer channel wall extending from the left side transfer port and the side transfer channel wall extending from the right side transfer port.