Air cylinder head for three-air-valve engine

Abstract

The invention discloses an air cylinder head for a three-air-valve engine. A cooling air channel consists of an air inlet (2), a first drainage channel (3), a second drainage channel (4) and an air outlet (5); the length (L1) of the air inlet (2) is 32.5 to 39.5 millimeters and the width (L2) of the air inlet (2) is 30 to 36 millimeters; the width (L3) of the first drainage channel (3) is 10 to 16 millimeters and the height (L4) of the first drainage channel (3) is 26 to 32 millimeters; the width (L5) of the narrowest part of the second drainage channel (4) is 26 to 32 millimeters and the width (L6) of the widest part of the second drainage channel (4) is 44 to 50 millimeters; and the height (L7) of the shallowest part of the second drainage channel (4) is 15 to 21 millimeters and the height (L8) of the deepest part of the second drainage channel (4) is 26 to 32 millimeters. By optimally designing the cooling air channel, the pneumatic characteristic of the cooling air channel can be improved remarkably; furthermore, the cylinder temperature of the air cylinder head for the three-air-valve engine is reduced effectively and the performance of the three-air-valve engine is improved greatly.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a cylinder head of a three-valve engine. Background technique [0002] At present, small-displacement motorcycle engines all adopt a two-valve structure. This is because small-displacement motorcycle engines have relatively low performance requirements for medium and high speeds. Although the conventional two-valve engine is relatively noisy, it can meet the operating requirements. Require. With the continuous improvement of performance requirements, it has become a development trend to use three-valve engines on small-displacement motorcycles. The cylinder head of a conventional three-valve engine is generally equipped with a cooling air duct. The design of the cooling air duct is unreasonable, and there is a corner near the inlet of the cooling air duct, which may easily cause the air flow in the cooling air duct to be unsmooth; at the same time, the cooling air du...

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Problems solved by technology

The cylinder head of a conventional three-valve engine is generally equipped with a cooling air duct. The design of the cooling air duct is unreasonable, and there is a corner near the inlet of the cooling air duct, which may easily cause the air flow in the cooling air duct to be unsmooth; at the same time, the cooling air duct There is a strong vortex flow group at the outlet, which leads to a large airflow resistance there, so that the air with a small flow in the cooling air duct cannot flow out, so the heat on the back of the combustion chamber cannot be taken away by the cooling airflow, resulting in a very high temperature of the cylinder head. high

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