FIELD: mechanical engineering; hydraulic control systems for infinitely variable transmissions.
SUBSTANCE: proposed hydraulic control scheme includes first control valve 
for control of pressure of working fluid delivered under pistons of drive and second control valve 
for control of hydraulic pressure of working fluid delivered to change-over unit of gearbox clutches. Valves 
and 
are connected in succession to each other in way of flow by means of first valve mechanism 
; they direct working fluid from each pump 
and 
to first point 
located in way of flow above valve 
or to second point 
located in way of flow below valve 
but above valve 
.
EFFECT: possibility of performing independent control of clutches; enhanced efficiency.
25 cl, 12 dwg
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