A variable summand of the rotary mechanism reaction torque, in particular that of the reciprocating compressors, is one of the main sources of their low-frequency vibration. Being solved in this study is a problem of providing the constantsign transmitted torque of the multistage reciprocating compressor in order to decrease its vibration. The investigation results concerning the influence of different structural parameters on the torque diagram are given. The description of a software program

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... eveloped specially to carry out this investigation is represented. The description of the structural solution is given aimed at obtaining the most uniform torque diagram which has a constant sign during a single revolution of the crankshaft. In the majority of structures the counter-rotation is provided by the gearwheel. At that, a necessity occurs to exclude the dynamic displacement of teeth, which decreases the transmission resource and invokes the increased noise. As for the reciprocating compressors, this requirement is met through constant-sign transmitted torque. I.e. the counter-torque at the compressor shaft and, consequently, the reaction torque equal thereto and applied to the housing, must not change its sign during the whole revolution and must be completely carried-over through the transmission with the external gearing [2]. The research object is the four-stage reciprocating compressor intended for use in the gas-transmission and gas-filling compressor stations. Figure 1 contains a general view and movement mechanism of the compressor under consideration. The given compressor is developed by Compressor JSC and made with a crankshaft vertical configuration [3] . The compressor is intended for compression of methane or natural gas to the final pressure of 24.6 MPa, with a short-term operation up to a pressure of 39.2 MPa.