A reciprocating linear motion and circular motion conversion device

Abstract

The invention relates to a device for switching between reciprocating linear movement and circumferential movement. The device comprises a shell, a transmission shaft, a transmission arm, transmission chains, transmission chain grooves, driving plates, a transmission pin column, connecting plates, connecting rods and a guide plate, wherein two transmission chain grooves are symmetrically formed one above the other; groove outer edges are fixedly connected with the shell; groove inner edges are fixedly connected with the groove outer edges through the connecting plates; two transmission chains are arranged in two transmission chain grooves; one or two corresponding end parts of the two transmission chains are fixedly connected with the connecting rod; the transmission shaft is arranged in a bearing base on the shell by passing through circular holes formed in the groove inner edges; one end of the transmission arm is vertically and fixedly connected with the transmission shaft, and the other end of the transmission arm is provided with an open sliding chute along a middle line; the driving plates are symmetrically arranged one above the other at corresponding positions of the two transmission chains; the driving plates are provided with driving straight grooves opened in one ends along the middle line; the transmission pin column is placed into the sliding chute, and the inner end part of the transmission pin column extends into the driving straight groove. By adopting the device, the defects of a crankshaft connecting rod mechanism are overcome, and power transfer and movement way switching are more reasonable.

Description

technical field [0001] The invention relates to a reciprocating linear motion and circular motion conversion device, in particular to a chain column-rocker arm type engine piston motion conversion device. Background technique [0002] In the field of mechanical engineering, the working principle adopts the mutual conversion between reciprocating linear motion and circular motion, such as piston engines, compressors, etc. At present, the design of crankshaft (crank) connecting rod mechanism is generally used. Although its manufacturing process and technology have been It is very perfect, but limited by the structure of the crankshaft (crank) linkage mechanism, there are insurmountable shortcomings both in theory and in practical applications: [0003] 1. The conversion efficiency of the crankshaft (handle) linkage mechanism is low. Taking the piston-connecting rod-crankshaft (handle) mechanism engine as an example, the gas pressure in the cylinder is converted into the torqu...

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Problems solved by technology

[0004] 2. The crankshaft (handle) connecting rod geometric mechanism and its stress state are complex, and all components are in a three-dimensional stress state

Due to the crankshaft and connecting rod swing and the top and bottom dead centers in the crankshaft connecting rod mechanism, the gas pressure acting on the piston is decomposed into the force along the axis of the connecting rod and the side pressure acting on the cylinder wall perpendicular to the axis of the cylinder. The side pressure acting on the cylinder wall causes the piston and the cylinder wall to generate a large lateral friction force, which not only reduces the working efficiency of the piston, but also accelerates the wear rate of the cylinder wall, increases the probability of "stuck cylinder", and makes the piston unable to work

[0005] 3. The total acting force in the direction of the piston axis is equal to the algebraic sum of gas pressure, inertial force and friction acting on the piston. The unbalanced rotary mass and rotary motion of the crankshaft connecting rod mechanism will produce inertial force, and the inertial force and frictional force are always related to The gas pressure acts in the opposite direction, so that the total force in the axial direction of the piston is smaller than the gas pressure acting on the piston, which reduces the output power of the engine. Generate large vibration and noise

[0006] 4. The swing of the crankshaft and connecting rod will cause alternating impact force on the rotating contact surface between the piston and the cylinder wall and the crankshaft (handle), which increases the uneven friction and impact between the various components and affects the performance of the engine, such as knocking that occurs from time to time. At the same time, due to the swing of the crankshaft and connecting rod, the piston must also be provided with a longer piston skirt guide

[0007] In order to overcome the defects of the crankshaft connecting rod mechanism engine, many people have tried to develop a conversion mechanism that replaces the crankshaft connecting rod mechanism from reciprocating linear motion to circular motion. At present, there is no practical conversion mechanism that can replace the crankshaft connecting rod mechanism of the engine.

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