Radial four-cylinder constant-flow reciprocating plunger pump transmission unit

The invention provides a radial four-cylinder constant-flow reciprocating plunger pump transmission unit. The unit comprises a uniform speed-variable speed conversion mechanism, and a variable speed-uniform speed conversion mechanism, wherein an input shaft of the uniform speed-variable speed conversion mechanism is connected with a power mechanism to change uniform-speed rotation to periodic variable-speed motion; an input end of the variable speed-uniform speed conversion mechanism is coaxially connected with an output shaft of the uniform speed-variable speed conversion mechanism to change periodic variable-speed motion to uniform-speed regular quadrangle trajectory motion; and each edge of a regular quadrangle is connected with a plunger of a reciprocating plunger pump. The unit realizes constant-flow output of the reciprocating plunger pumps by matching of the uniform speed-variable speed conversion mechanism and the variable speed-uniform speed conversion mechanism, largely reduces the pressure fluctuat