The invention discloses a combined
piston type electronic
vacuum pump for an automobile. The combined
piston type electronic
vacuum pump comprises a valve body, an
electric motor assembly, a
noise reduction and exhaust
assembly, an eccentric shaft
assembly, two
piston assemblies and two air inlet one-way valves. The valve body is provided with a center inner cavity, a motor mounting hole is formed in the upper end face of the valve body, the valve body is provided with a left ladder hole and a right ladder hole, and the left ladder hole, the right ladder hole and the motor mounting hole are all communicated with the center inner cavity; a combined type
dynamic balance transmission eccentric shaft assembly is mounted in the center inner cavity, the center inner cavity is connected with the
noise reduction and exhaust assembly for carrying out covering and sealing, and the
electric motor assembly is mounted in the motor mounting hole; and the end face of the left ladder hole and the end face of the right ladder hole are connected with end covers for sealing, the piston assemblies and the air inlet one-way valves are arranged in the left ladder hole and the right ladder hole, and the
electric motor assembly is mounted on the left ladder hole and the right ladder hole, and is connected with the eccentric shaft assembly to drive the assembly to rotate. A new transmission balance mechanism, a piston structure and the like are adopted in the
vacuum pump, the assembly cost and the
machining cost are reduced, the assembly safety is improved, sealing of the pump is obviously improved, the
noise of the pump is obviously lowered, the service life of the pump is obviously prolonged, and various requirements of automobile use can be met.