Engine

Abstract

The present invention relates to an engine in which the stroke of a piston at an expansion stroke is larger than that at a compression stroke. In order to ensure that a top dead center at each of intake and exhaust strokes and a top dead center at the compression stroke are at the same level, the following dimensions are determined according to an equation representing a level of a piston pin, so that the top dead center at each of the intake and exhaust strokes and the top dead center at the compression stroke are congruous with each other: a length of a second arm; a length of a first arm; a length of a control rod; a length of a connecting rod; a length from an axis of a crankshaft to axes of rotary shafts in a direction of a y-axis; a length from the axis of the crankshaft to the axes of the rotary shafts in a direction of an x-axis; an amount of offsetting of a cylinder axis from the axis of the crankshaft in the direction of the y-axis: an angle formed by the first and second arms; a length between the axis of the crankshaft and the crankpin; a length of a straight line connecting the axes of the rotary shafts; and an axis of a movable eccentric shaft and an angle when a crank angle is "0".The present invention relates to an engine in which the stroke of a piston at an expansion stroke is larger than that at a compression stroke. In order to ensure that a top dead center at each of intake and exhaust strokes and a top dead center at the compression stroke are at the same level, the following dimensions are determined according to an equation representing a level of a piston pin, so that the top dead center at each of the intake and exhaust strokes and the top dead center at the compression stroke are congruous with each other: a length of a second arm; a length of a first arm; a length of a control rod; a length of a connecting rod; a length from an axis of a crankshaft to axes of rotary shafts in a direction of a y-axis; a length from the axis of the crankshaft to the axes of the rotary shafts in a direction of an x-axis; an amount of offsetting of a cylinder axis from the axis of the crankshaft in the direction of the y-axis: an angle formed by the first and second arms; a length between the axis of the crankshaft and the crankpin; a length of a straight line connecting the axes of the rotary shafts; and an axis of a movable eccentric shaft and an angle when a crank angle is "0".

Description

technical field [0001] The present invention relates to an engine comprising: a connecting rod, one end of which is connected to a piston through a piston pin; a first arm, one end of which is rotatably connected to the other end of the connecting rod , the other end of the first arm is connected to the other end of the crank shaft through a crank pin; the second arm, one end of the second arm is integrally connected with the other end of the first arm; the control rod, one end of the control rod Rotatably connected to the other end of the second arm; a movable eccentric shaft is installed between the eccentric positions of some rotating shafts to reduce the power transmission from the crank to the crank with a reduction ratio of 1 / 2. The rotating shaft, the movable eccentric shaft is connected to the other end of the control rod, and the piston stroke during the expansion stroke is greater than that during the compression stroke. Background technique [0002] Conventionall...

AI Technical Summary

Problems solved by technology

However, if the center position of the top dead center in each of the intake stroke and the exhaust stroke is higher than the position of the top dead center in the compression stroke, each of the intake valve and the exhaust valve The valve and the top of the piston will interfere with each other

If the center of the top dead center in each of the intake and exhaust strokes is at a level lower than that of the top dead center in the compression stroke in order to avoid said mutual interference, then, in compression The top dead center in the stroke will be lower, making it undesirable to increase the compression ratio and making it difficult to run the engine at higher thermal efficiency

On the other hand, if the height of the top dead center in the compression stroke is higher than the height of the top dead center in each of the intake stroke and the exhaust stroke, then the piston will not be able to discharge the exhaust gas sufficiently, This is because the height of the piston at the top dead center is low in each stroke of the intake stroke and exhaust stroke, so that a large amount of burned gas will remain in the cylinder, so in the full load state Reduces output and makes combustion unstable at lower loads

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