Gear pump shell, gear pump and oil supply system

The utility model relates to the technical field of pumps, and discloses a pump shell of a gear pump, the gear pump and an oil supply system, the inner walls of the pump shell of the gear pump, which are positioned at two axial ends of a paired gear, are end inner walls, and the end inner walls are provided with oil supplementing grooves communicated with a low-pressure area of the gear pump; the oil supplementing device is used for supplementing oil for tooth groove and tooth root areas, located in a transition area of the gear pump, of the matched gear. According to the pump shell of the gear pump provided by the utility model, when the gear pump applying the pump shell of the gear pump works under a high-speed working condition, oil in a tooth groove of a matched gear is thrown to the vicinity of an addendum circle of the matched gear under the action of centrifugal force, so that the oil pressure in a tooth root area of the tooth groove is reduced; at the moment, the oil in the low-pressure area can be au