Abstract: The crosshead is an essential power transmission component in reciprocating pump and it is under sliding friction in a working cycle. The mechanical efficiency and effective life of reciprocating pump is influenced by the friction loss. Studying the equation of motion of crosshead, the formula for calculating sliding friction is obtained by using MATLAB; the maximum sliding friction and the position of crank are given. Meanwhile, the friction loss of the cross head is further calculated, which provides reference for the wear analysis and lubrication design of crosshead.

Key words: reciprocating pump, crosshead, friction loss, calculation, MATLAB