Vehicle height adjusting system

A vehicle height adjusting system for a wheel suspension system that is configured to be interposed between one of a vehicle end member and a wheel end member, and an opposing end of a suspension spring, the vehicle height adjusting system comprising:

• a housing connected to said one of the vehicle end member and wheel end member;
• a spring seat retainer connected to said opposing end of the suspension spring;
• a first rotor rotatably supported by the housing and provided with a first driven gear along an outer periphery thereof;
• a second rotor rotatably supported by the spring seat retainer and provided with a second driven gear along an outer periphery thereof, the second rotor being coaxially disposed in relation with the first rotor around a common axial line and joined with the first rotor via a threading coupling that converts a relative rotation around the common axial line into a relative linear movement of the first and second rotors towards and away from each other along the common axial line;
• a drive shaft rotatably supported by the housing and provided with a first drive gear meshing with the first driven gear and a second drive gear meshing with the second driven gear;
• and
• a drive mechanism mounted on the housing for turning the drive shaft;
• a gear ratio between the first drive gear and first driven gear being different from a gear ratio between the second drive gear and second driven gear,
• wherein the second drive gear is provided with such a width as to ensure meshing with the second driven gear over an entire linear axial travel of the second rotor relative to the first rotor, and
• wherein the drive shaft comprises a cylindrical member and the first and second drive gears are formed on an inner periphery of the cylindrical member as internal gears.