Assembly type balance shaft chain wheel

The assembly type balance shaft chain wheel comprises an upper core body, a gear ring and a lower core body, and the upper core body comprises an upper shaft sleeve used for being inserted into the upper portion of a center hole of the gear ring and an upper pressing ring used for clamping the upper surface of the gear ring; the lower core body comprises a lower shaft sleeve used for being inserted into the lower portion of a center hole of the gear ring and a lower pressing ring used for clamping the lower surface of the gear ring. The upper pressing ring, the gear ring and the lower pressing ring are connected in a penetrating mode through a plurality of bolts. The balance shaft chain wheel is changed into a split type structure from an original integrated structure, the balance shaft chain wheel is divided into the upper core body, the gear ring and the lower core body which are independently formed through powder metallurgy, the upper core body, the gear ring and the lower core body are used in a whole se