Reciprocating pushing chain is a new mechanism of chain transmission. In this paper

the structure and working principle of reciprocating pushing chain

is studied. And the engaging process between chain and chain wheel is analyzed in detail. By negative shift designing of chain wheel

realizable moving locus of centre of chain roll coincide with theoretical moving locus

and motion of chain is made effectively smooth. Contact ratio ε about chain wheel engaging with chain is analyzed

and the guidance is furnished for selecting contact ratio ε.