Engine structure with variable connecting rod length

Abstract

The invention discloses an engine structure with a variable connecting rod length. The upper end of a small head of a connecting rod is hinged to a piston, a large head of the connecting rod is hinged to a connecting rod journal, and a cavity and an arc-shaped slide are formed in the large head of the connecting rod; an auxiliary connecting rod and a fan-shaped swing block are arranged in the cavity, the upper end of the auxiliary connecting rod is hinged to the lower end of the small head of the connecting rod, and the lower end of the auxiliary connecting rod is hinged to the upper end of the fan-shaped swing block; a return spring is arranged at the right end in the arc-shaped slide, the fan-shaped swing block swings along the arc-shaped slide, and the right end of the fan-shaped swing block is propped against the left end of the return spring; the lower left end of the fan-shaped swing block is hinged to the upper end of a small connecting rod, a rocker arm is hinged below the large head of the connecting rod, the upper end of the rocker arm is hinged to the lower end of the small connecting rod, and a rolling wheel is installed at the lower end of the rocker arm; and an arc-shaped guide rail is manufactured on the inner side of a crank arm of a crankshaft, and the rolling wheel moves along the arc-shaped guide rail. According to the engine structure, the length of the connecting rod is increased, so that the piston is kept in a top dead center without movement, the crankshaft continues to rotate to enable a power arm of the crankshaft to increase in advance, and the purpose that combustion pressure is efficiently converted into output torque of the crankshaft is achieved.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to an engine structure with variable connecting rod length. Background technique [0002] During the working process of the traditional reciprocating piston engine, the highest pressure of the combustion explosion occurs at about 10° after the crankshaft moves to the top dead center. At this time, when the gas pressure acting on the top of the piston reaches the maximum value, the torque output by the crankshaft is the largest. But at this time, the crankshaft main journal, crank arm, and connecting rod are basically on the same straight line, the crankshaft power arm is very short, and most of the thrust of the piston is applied to the lower bearing bush of the crankshaft main journal, so there is almost no torque change. When the piston moves downward, the inclination of the crank arm and the connecting rod increases, and when the angle between the crank arm an...

AI Technical Summary

Problems solved by technology

For the entire power stroke, the explosive force of the gas cannot be efficiently converted into the rotational torque output of the crankshaft, resulting in low efficiency of the traditional reciprocating piston engine

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