Hydraulic planetary gear differential steering device of wheel type modified crawler tractor

The invention discloses a hydraulic planetary gear differential steering device of a wheel type modified crawler tractor. The hydraulic planetary gear differential steering device comprises a planetary reduction gearbox body, a connecting sleeve is fixedly connected to one side of the planetary reduction gearbox body, a hydraulic motor is fixedly connected to the outer end of the connecting sleeve, a shaft of the hydraulic motor is in spline connection with a driving connecting disc, the driving connecting disc is fixedly connected with a driven connecting disc, and the driven connecting disc is in spline connection with a first sun wheel shaft. The other side of the planetary reduction gearbox body is fixedly connected with a fixed disc; the fixed disc is in spline connection with a second sun wheel shaft. A first inner gear ring and a first outer gear ring are fixedly connected to a first gear ring connecting disc, and a second inner gear ring and a second outer gear ring are fixedly connected to a second g