Patent ID: 7922181

Claim:
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.