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.
Claims6
An electric motor for driving a piston pump comprising:
- a yoke including a yoke bearing located at one end of the yoke;
- a pump housing connected to the 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 said first pump housing bearing;
- 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;
- wherein an inner cylinder portion of the pump housing comprises the sequential formation of:
- a first pump housing bearing support portion by which the first pump housing bearing is supported;
- a second pump housing bearing moveable support portion which is smaller in diameter than the first pump housing bearing support portion and by which the second pump housing bearing is moveably supported;
- a temporary supporting portion which is smaller in diameter than the second pump housing bearing moveable support portion and configured to support the second pump housing bearing in a temporarily supported state;
- and
- an inserting hole portion for inserting a jig from a side of the pump housing that is opposite a side to which the yoke is connected to press against an inner ring of the second pump housing bearing which is temporarily supported and then to press the inner ring onto the eccentric shaft tip portion of the armature shaft.
Dependencies are inferred from the claim text.