VARIABLE COMPRESSION RATE MECHANISM FOR INTERNAL COMBUSTION ENGINE Russian patent published in 2018 - IPC F02B75/04 F02B75/32 F02D15/02 F16H1/28 F16H1/32 

FIELD: machine building.

SUBSTANCE: invention relates to variable compression ratio mechanism (5) in which control shaft (10) rotates and is driven by electric motor (21) through wave reduction gear (22). Wave gear (22) includes: first element (31) with internal gearing; element (32) with external gearing, located concentrically inside first gear element (31) with internal gearing; wave generator (33) located inside gear element (32) with external engagement; and second element (34) with internal gearing, the ratio of the number of teeth of fixed toothed portion (35) of first toothed element (31) with internal gearing to the number of teeth of first toothed portion (37) of toothed element (32) with external gearing is set lower than the ratio of the number of teeth of output gear portion (42) of second gear element (34) with internal gearing to the number of teeth of second gear portion (38) of gear element (32) with external gearing. Thus, the height of the tooth of output toothed portion (42) of second toothed element (34) with internal gearing is made relatively large in order to achieve a higher torque of oscillation and prevent angular oscillations.

EFFECT: technical result consists in increasing the moment of occurrence of oscillations and preventing angular oscillations.

8 cl, 5 dwg