Variable displacement piston driving mechanism, design method and driving device

Abstract

The invention discloses a variable-displacement piston driving mechanism, a design method and a driving device. The variable-displacement piston driving mechanism comprises a spindle, a swash plate mounting seat, a swash plate, a swash plate adjusting mechanism, a piston cylinder assembly and the like, wherein rotation of the spindle is converted into three-dimensional swinging of the swash plate around the swash plate and a sphere-pin pair center which is connected with the swash plate mounting seat to drive a connecting rod and the piston cylinder assembly to finish working cycle; meanwhile, the mechanism adjust the inclination angle of the swash plate according to the position of the swash plate to dynamically adjust working volume of the piston cylinder assembly; and the position relationship between an upper stopping point and a lower stopping point of a piston is coordinated to meet different application requirements. According to the scheme, the working volume of the piston cylinder is dynamically adjusted, matching conditions of the piston cylinder are improved, and mechanical efficiency of a system is improved.

Description

technical field [0001] The invention relates to the field of piston driving, in particular to a variable displacement piston driving mechanism, a design method and a driving device. Background technique [0002] Among modern piston engines, compressors, piston pumps and many other mechanical equipment, the crankshaft connecting rod piston drive mechanism is the most widely used. Its defects are: [0003] 1. The traditional crankshaft-connecting rod piston drive mechanism is limited by the fixed crank size, the piston can only reciprocate on a fixed stroke, the working volume of the piston cylinder assembly cannot be changed, and the adaptability to different working conditions is poor. [0004] 2. The system movement of the traditional crankshaft-connecting rod piston drive mechanism is completed through the interaction of the crankshaft-connecting rod-piston-cylinder. When the crankshaft rotates, there is an included angle between the connecting rod and the axis of the pi...

AI Technical Summary

Problems solved by technology

[0003] 1. The traditional crankshaft-connecting rod piston drive mechanism is limited by the fixed crank size, the piston can only reciprocate on a fixed stroke, the working volume of the piston cylinder assembly cannot be changed, and the adaptability to different working conditions is poor

[0004] 2. The system movement of the traditional crankshaft-connecting rod piston drive mechanism is completed through the interaction of the crankshaft-connecting rod-piston-cylinder

The radial force on the piston will cause the friction force of the piston and cylinder, which will reduce the mechanical efficiency of the system; it will also cause deformation of the piston and cylinder, reduce the air tightness of the piston and cylinder combination, and put forward higher requirements for the material and technology of the cylinder and piston; the diameter of the piston Transmitting to the impact will form a lateral vibration

In addition, when the working pressure of the cylinder is the highest, since the crank and the connecting rod are almost 180 degrees, the torque output is relatively small.

[0005] 3. The cylinder bore-to-stroke ratio of the traditional crankshaft-connecting-rod piston drive mechanism cannot be changed, and the adaptability is poor

Therefore, the fixed bore-to-stroke ratio leads to poor adaptability of the system to working conditions

[0006] 4. The crank length of the traditional crankshaft piston engine = piston stroke / 2, a larger piston stroke will inevitably require a larger crank length, and a larger crank length will inevitably require a larger crankcase

Thereby increasing the volume and weight of the equipment

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