High-performance transmission-ratio variable gear differential mechanism

The utility model relates to a high-performance differential gear with variable steering ratio, which simplifies tooth curve design and processing of Column gear pair with variable steering ratio and increases theoretical locking coefficient largely. The utility model comprises shell of the differential gear. Four column gears including two half axle gears and two planet gears are provided on the shell of the differential gear. The half-axle column gear (1) mesh with the planet column gear (2), and the planet column gear (2) mesh with planet column gears (3). The planet column gear (3) meshes with half-axle column gear (4). The half-axle column gear (1), planet column gear (2), planet column gears (3) and the half-axle column gear (4) are in three different planes. The shell of the differential gear is integral, and theoretical locking coefficient is product of three steering ratios of the four column gears.