Electric motor for driving a piston pump and method of assembly
AssigneeMitsuba Corporation
InventorsMasato Iwata, Hiroshi Hagiwara
Life of this patent
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Abstract
An electric motor for driving a piston pump assembled thereto is disclosed wherein a load from the piston pump acts radially on an armature shaft of the electric motor. The electric motor is assembled such that the outer ring of a yoke bearing is connected to a yoke, and the outer ring of a first pump housing bearing is press fit to a pump housing. One end of the armature shaft is press fit to the yoke bearing inner ring, and the other end of the armature shaft is press fit to the first pump housing bearing inner ring. Thus, wobbling of the armature shaft in the axial and radial directions is minimized or eliminated.
Claims8
A method for assembling an electric motor for driving a piston, wherein the electric motor for driving a piston includes:
- a yoke including a yoke bearing located at one end of the yoke;
- a pump housing connected to other end of the yoke and including a first pump housing bearing located in the pump housing;
- an armature shaft extending between the yoke bearing and the first pump housing bearing and including an eccentric shaft tip portion protruding from the first pump housing bearing and receiving a load for driving the piston in a radial direction;
- and
- a second pump housing bearing, smaller in diameter than the first pump housing bearing, located on the eccentric shaft tip portion of the armature shaft, the method comprising:
- press fitting an outer ring of the first pump housing bearing to the pump housing;
- assembling an outer ring of the yoke bearing to the yoke;
- press fitting one end of the armature shaft to an inner ring of the yoke bearing;
- press fitting the other end of the armature shaft to an inner ring of the first pump housing bearing;
- thereby
- bearing the one end of the armature shaft of the electric motor by a yoke with a yoke bearing;
- and
- bearing the other end of the armature shaft by a pump housing with a first pump housing bearing.
Dependencies are inferred from the claim text.