The majority of pneumatic/hydraulic actuators uses scotch yoke technology to transform the linear piston movement into a rotary one.
Gaps between the sliding block and the scotch yoke slot inevitably have a negative influence on both precision and functional dynamic (i.e. hysteresis, dead band, small step response, etc.). Going on towards the operative life of the actuator, this inaccuracy becomes inevitable and increases consistently.
Zero Backlash (ZB) mechanism solves the native and the wearing-related gap between the sliding block and the scotch yoke slot, maintaining friction values at comparable levels to the state-of-the-art technology.