Reciprocating-rotational motion conversion mechanism and water pump

Abstract

The invention discloses a reciprocating-rotational motion conversion mechanism and a water pump. The mechanism comprises a crankshaft 1, a piston 2, a machine body and a crankshaft planetary motion drive mechanism 3, wherein the crankshaft planetary motion drive mechanism 3 of a gear structure is of a five-shaft structure. The first shaft is a synchronous shaft 35, and outer gears 31, 32 and 38 are installed on the synchronous shaft 35; the outer gears 32 and 38 have the same tooth number and modulus; the outer gear 31 is engaged with an outer gear 31' through an outer gear 34; a reversing shaft 37 allowing the outer gear 34 to be installed is the third shaft; the outer gear 31' is installed on a main shaft 36, and the main shaft 36 is the fourth shaft; an outer gear 32' and an outer gear38' are installed on a machine body through eccentric wheels which are coaxial with and fixedly connected the outer gear 32' and the outer gear 38' separately; the two eccentric wheels are coaxial, and the shaft is the second shaft; the outer gear 32' is engaged with an outer gear 32, and an outer gear 38 is engaged with the outer gear 38'; and the eccentric holes of the two eccentric wheels keepthe same phase, and crankshaft journals at the two ends of the crankshaft 1 are installed on the eccentric holes in a rotatable manner. The scheme provided by the invention is capable of realizing a heavy load easily.

Description

technical field [0001] The invention relates to a transmission mechanism, in particular to a reciprocating-rotational conversion mechanism. The present invention also provides a water pump using the reciprocating-rotating motion conversion mechanism. Background technique [0002] In the patent document with the publication number CN1480633A, "a high thermal efficiency internal combustion engine long-stroke zero side pressure technology and device" is proposed. The device replaces the eccentric shaft of the traditional crankshaft with planetary motion through the internally meshed planetary motion gear pair, and then drives The piston connected to the eccentric shaft performs reciprocating linear motion; the inner meshing planetary gear is centered, the inner ring gear is fixed, the outer gear and the inner ring gear mesh with each other for planetary motion, and the center of the eccentric shaft and the outer gear Rotationally connected, and the pitch circle diameter of the...

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Problems solved by technology

[0004] 1. The above technology is applied to the internal combustion engine. Since the internal combustion engine only performs external work in the power stroke, and other strokes need to absorb work, this will cause frequent reversing of the meshing side when the planetary gear pairs in the mechanism mesh. , this phenomenon is similar to the frequent change of active and passive gears, which will cause damage to the planetary gear pair

Even if it is used in the field of air compressors, it often causes the piston to do work on the eccentric shaft instead of consuming work during the suction stroke due to the pressure of the suction gas, which will also cause the problem of frequent reversing of the meshing side.

Increasing the number of crank throws and pistons can avoid the commutation problem, but at this time, the piston phase needs to be evenly arranged, and the working direction of some pistons will appear downward. For internal combustion engines, the pistons arranged downward usually encounter The major problem that the piston ring lubricating oil easily enters the cylinder to participate in combustion

[0005] 2. Since the diameter of the indexing circle of the external gear that performs planetary motion in the planetary crankshaft transmission mechanism is twice the eccentricity e of the eccentric shaft, when the diameter of the indexing circle of this gear is increased, the eccentricity of the eccentric shaft is also the same as Increase, the torque generated by the piston force acting on the eccentric shaft is also increasing year-on-year due to the increase of the eccentric shaft eccentricity, and finally the gear cannot bear heavy loads by increasing the diameter

It is also very limited to increase the load-carrying capacity by increasing the length of the meshing line, that is, increasing the tooth width, because the actual meshing line cannot be too long

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