The utility model discloses a novel bell housing structure belongs to the engine technology field, aims at providing a simple structure, and required installation space is little, improves the bell housing structure of starter reliability, and its technical scheme main points include the bell housing body, the upper portion of bell housing body is equipped with the fixing base with engine inlet port one end looks adaptation, the symmetry is provided with first installation base and second installation base on the left and right sides of the surface of revolution of bell housing body, the bell housing body still is equipped with the mounting flange who installs the starter the second installation base with one side, be equipped with the central through hole on the bell housing body, bell housing body outer end be equipped with connect the gearbox and with the coaxial ring shape butt joint portion of central through hole, the outside terminal surface of first installation base and second installation base all with the gyrostat profile of the ring that is equipped with of bell housing body shape butt joint portion tangent, the utility model is used for reduce the heat radiation that the starter received.