Piston oil-return structure of horizontal opposed piston two-stroke internal combustion machine

Abstract

The invention discloses a piston oil-return structure of a horizontal opposed piston two-stroke internal combustion machine. The piston oil-return structure comprises two gas rings at the head part of a piston and a piston pin hole (1), a third gas ring (2) and an oil ring (3) which are arranged in sequence from top to bottom; more than two oil return holes (4) are uniformly formed in the circumference of the bottom of an annular channel of the oil ring (3); more than two oil return holes (5) are uniformly formed in the outer circumference of a piston below the third gas ring (2); inner hole openings of the two groups of oil return holes are communicated with a crankshaft box; 8 oil return holes (4) are formed and have the aperture of being 2.5mm respectively; 8 oil return holes (5) are formed and have the aperture of being 1.5mm respectively; and the respective 8 oil return holes of two groups are respectively arranged in a staggered and symmetrical manner. According to the piston oil-return structure, the third gas ring and the oil ring can seal gas and also can sweep off a part of engine oil on the inner wall of a cylinder bushing; and the piston oil-return structure overcomes the defect of difficulty in oil return of a horizontal piston and has the remarkable effect in terms of engine oil consumption of the horizontal opposed two-stroke internal combustion machine.

Description

[0001] technical field [0002] The invention belongs to the technical field of internal combustion engines, and in particular relates to a piston oil return structure of a two-stroke internal combustion engine with horizontally opposed pistons. Background technique [0003] The traditional combustion chamber is composed of a piston top, a cylinder liner, and the top surface of a cylinder head, while the combustion chamber of a two-stroke internal combustion engine with horizontally opposed pistons is composed of two opposite piston tops and a cylinder liner. [0004] For one thing, the pistons sit horizontally, and the oil doesn't gravitationally return to the sump as well compared to traditional in-line or V-type machines. [0005] On the other hand, due to the two-stroke structure, there are three layers of intake and exhaust ports (intake port and exhaust port) on the cylinder liner. In one working cycle, the first and second gas rings of the two opposed pistons pass...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems of difficult oil return and increased oil consumption due to the horizontal placement of the piston and the gas port structure of the cylinder liner in a two-stroke internal combustion engine with horizontally opposed pistons

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