Method for machining the connecting rod passage in a cylinder crankcase, cylinder crankcase and engine obtained using the method

摘要

A method for machining a passage for a connecting rod in an internal combustion engine crank case upper half, including producing, at a base of the cylinder barrel, a straight cut of cylindrical shape capable of allowing the connecting rod a lateral excursion as a piston moves up and down in the cylinder, using a rotary milling tool which is plunge-operated from underneath the cylinder, and a direction of plunging of the milling tool is oriented at an oblique angle to the axis of the cylinder.

主权项

1. A method for machining a connecting rod passage of a connecting rod, including a bore at a first end to receive a crankshaft, in a cylinder crankcase of an internal combustion engine, comprising:
producing at a base of a cylinder shaft a straight cut of cylindrical form, to allow lateral travel of the connecting rod in a plane perpendicular to a rotational axis of the bore of the connecting rod when a piston connected to the connecting rod at a second end moves up and down in the cylinder shaft, with a rotary milling tool that operates by travel in the plane perpendicular to the rotational axis of the bore of the connecting rod and below the cylinder shaft; wherein the straight cut is spaced apart from a horizontal through-hole extending through a cylinder liner into an adjacent cylinder shaft for passage of gases from the cylinder shaft, and wherein a direction of travel of the milling tool is orientated obliquely relative to an axis of the cylinder shaft.