HVAC system for a motor vehicle

A HVAC system for a motor vehicle, the system comprising:

• a housing having an air inlet for admitting air and a cold air path in which cold air flows is provided in the housing and a warm air path in which warm air flows is provided in the housing, wherein the warm air path and the cold air path open into a mixing chamber;
• a mixing flap for controlling the proportion of cold air flowing into the mixing chamber and the proportion of warm air flowing into the mixing chamber, wherein the mixing flap is arranged rotatable about an axis and is driven by a flap actuator that has a drive shaft;
• a gear assembly with a nonlinear translation characteristic arranged between the mixing flap and the drive shaft,
• wherein the gear assembly is a gear train, which has a gear train gear ratio that is variable via an angle of rotation of the drive shaft of the flap actuator or the gear assembly includes a belt drive or a friction gear, which has a gear ratio that is variable via the angle of rotation,
• wherein the nonlinear gear ratio or gear train gear ratio is selected such that the rotation of the mixing flap from an operating position of 100% cold is faster than from an operating position of 50% cold and 50% warm and from an operating position of 100% warm at the same angle of rotation of the drive shaft, and
• wherein the nonlinear gear ratio or gear train gear ratio is selected such that the gear ratio in the operating position of 100% cold is greater than 1, in the operating position of 50% cold and 50% warm is 1:1, and in the operating position of 100% warm is less than 1.