Experimental device for rotatable valve of engine

Abstract

The invention relates to an experimental device for a rotatable valve of an engine. The experimental device is characterized by comprising an adjustable-speed motor, a bearing gland, a bearing block, a bearing, an inner hexagonal bolt, a locking nut, a valve spring, a valve with back, a cylinder cover, a support, a guide pillar, a guide pillar spring, a press plate, an air inlet cam, a joint and a flexible shaft; an output shaft of the adjustable-speed motor is connected with the flexible shaft, the tail end of the lower part of the flexible shaft is connected with the tail part of the valve by virtue of the joint, and the adjustable-speed motor can drive the valve to rotate; the bearing is arranged at the tail part of the valve, the bearing gland compresses a bearing outer ring on the bearing block by virtue of the inner hexagonal bolt, a bearing inner ring is fastened at the tail part of the valve by virtue of the locking nut, the valve spring is embedded in a groove in the lower end of the bearing block, the lower end of the valve spring is embedded in a groove in the upper end of an extension part at the upper part of a simulated cylinder cover, and when the valve rotates, the bearing gland, the bearing block and the valve spring can not rotate respectively; a valve back structure is formed at the front end of the valve; the guide pillar is mounted below the right end of the pressing plate, and the guide pillar spring sheathes outside the guide pillar.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to an engine swirling valve experimental device. Background technique [0002] For the engine, the presence of tumble and swirl at the same time is more conducive to the organization of the combustion process. But for a four-valve engine, due to the symmetrical arrangement of the double intake port structure and the two cam profiles driving the intake valves are almost the same, the two intake valves open to the same degree at the same time, so that the intake speed of the two intake valves and With the same intake air volume, the swirling airflow in the cross-sectional direction of the cylinder block cancels each other out, and the overall movement of the air in the cylinder shows a single longitudinal tumble flow mode, with almost no vortex flow, which is an important factor causing poor mixture formation and worsening combustion . If the vortex is obtained by using ...

AI Technical Summary

Problems solved by technology

But for a four-valve engine, due to the symmetrical arrangement of the double intake port structure and the two cam profiles driving the intake valves are almost the same, the two intake valves open to the same degree at the same time, so that the intake speed of the two intake valves and With the same intake air volume, the swirling airflow in the cross-sectional direction of the cylinder block cancels each other out, and the overall movement of the air in the cylinder shows a single longitudinal tumble flow mode, with almost no vortex flow, which is an important factor causing poor mixture formation and worsening combustion

If tangential air passage or rotating air passage is used to obtain vortex flow, the structure of the cylinder head will be complicated and the airflow resistance will increase.

When one intake valve is open and the other intake valve is closed, a large vortex can be generated (Wang Jian, Liu Dexin, Liu Shuliang, etc., Steady flow test research on the flow characteristics of the intake port of a four-valve gasoline engine[J]. Journal of Internal Combustion Engines, 2004, 22 (2): 182-186), using a sliding variable intake structure, setting valves in the intake manifold can also generate swirl and control swirl (Liu Ruilin, Liu Zengyong, Gao Jin, etc. Four-valve gasoline engine with variable oblique axis Experimental research on the in-cylinder vortex characteristics generated by the vortex system [J]. Internal Combustion Engine Engineering, 2006, 27(3): 29-32.), but it is equivalent to reducing or cutting off part of the intake passage, which affects the intake air volume

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