Abstract: A vane pump includes a casing and a rotary unit rotatably held within the casing. The rotary unit includes a base portion with radially outwardly opened slits extending radially with respect to a rotational axis of the rotary unit and vanes slidably fitted in the respective slits. An annular chamber is formed around the base portion within the casing and divided into a plurality of pump chambers by the vanes. Each of the pump chambers has a volume cyclically expanded and contracted during rotation of the rotary unit to discharge the fluid drawn into each of the pump chambers. The casing includes an inlet port through which to draw the fluid into the annular chamber. The inlet port is arranged to face a portion of the annular chamber extending between a middle position and a terminating position of an expanding section in which each of the pump chambers expands.

Abstract: A claw pole type motor includes a rotor having a magnet arranged on an outer circumferential surface thereof and a stator including an annular iron core and an annular coil received within the iron core. The iron core includes a yoke portion opened in an inner circumferential surface opposite to the rotor, a plurality of upper claw-shaped magnetic poles and a plurality of lower claw-shaped magnetic poles which are arranged along an inner circumferential surface of the annular coil. The upper/lower claw-shaped magnetic poles are curved to extend axially downwardly/upwardly from an upper/lower inner edge of the yoke portion, respectively. The upper and the low claw-shaped magnetic poles are alternately arranged along a circumferential direction of the iron core. The yoke portion has cutout portions formed in non-magnetic path regions which do not include magnetic paths through which magnetic flux flows between neighboring claw-shaped magnetic poles across the annular coil.

Abstract: A vane pump includes a casing and a rotary unit rotatably held within the casing. The rotary unit includes a base portion with radially outwardly opened slits extending radially with respect to a rotational axis of the rotary unit and vanes slidably fitted in the respective slits. An annular chamber is formed around the base portion within the casing and divided into a plurality of pump chambers by the vanes. Each of the pump chambers has a volume cyclically expanded and contracted during rotation of the rotary unit to discharge the fluid drawn into each of the pump chambers. The casing includes an inlet port through which to draw the fluid into the annular chamber. The inlet port is arranged to face a portion of the annular chamber extending between a middle position and a terminating position of an expanding section in which each of the pump chambers expands.

Abstract: A vane pump includes a rotor chamber; a rotor eccentrically accommodated in the rotor chamber; a plurality of vanes attached to the rotor, each vane having a leading end adapted to make sliding contact with an inner peripheral surface of the rotor chamber. The vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor, and the vanes; an inlet port through which a working fluid is drawn into a working compartment; and an outlet port through which the working fluid is discharged from a working compartment. An engaging portion is formed in a peripheral end portion of a thrust surface of the rotor and an engaged portion with which the engaging portion engages in a non-contact state is formed in an inner surface region of the rotor chamber facing the thrust surface of the rotor in a non-contact state.

Abstract: A vane pump includes a rotor chamber; a rotor accommodated in the rotor chamber; a plurality of vanes attached to the rotor, each vane having a leading end adapted to make sliding contact with an inner peripheral surface of the rotor chamber. The vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor and the vanes; an inlet port through which a working fluid is drawn into a working compartment; and an outlet port through which the working fluid is discharged from a working compartment. A cutout portion is formed in a leading end portion of each vane on each of at least one of a leading and a trailing side of the leading end portion, the leading end of each vane having a width smaller than that of a base end portion of each vane.

Abstract: A vane pump includes a rotor accommodated in a rotor chamber; a plurality of vanes attached to the rotor, each of the vanes having a leading end adapted to make sliding make a contact with an inner peripheral surface of the rotor chamber. Further, the vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor and the vanes, the working compartments being adapted to undergo a volume change as the rotor is rotatably driven; an inlet port through which a working fluid is drawn into a working compartment whose volume is being increased; and an outlet port through which the working fluid is discharged from a working compartment whose volume is being decreased; and one or more blade base members protruded from portions on the outer peripheral surface of the rotor between the vanes adjacent to each other.

Abstract: A vane pump includes slits formed in a base portion of a rotary unit rotating in a casing and extend radially from a rotation axis of a rotary unit to be opened outwardly in a radial direction, a vane received in each of the slits to be protruded from or retreated into the slit, an annular chamber formed around the base portion in the casing and pump rooms formed by defining the annular chamber by using the vanes. The vane pump is operated to discharge fluid sucked into an associated pump room by rotating the rotary unit and thereby periodically increasing or reducing volume of the pump rooms. The vane pump further includes a fluid force generating portion provided on at least one of the rotary unit and the casing to generate fluid force to the upper side in an axial direction of the rotation axis by rotation of the rotary unit.

Abstract: A claw pole type motor includes a rotor having a magnet arranged on an outer circumferential surface thereof and a stator including an annular iron core and an annular coil received within the iron core. The iron core includes a yoke portion opened in an inner circumferential surface opposite to the rotor, a plurality of upper claw-shaped magnetic poles and a plurality of lower claw-shaped magnetic poles which are arranged along an inner circumferential surface of the annular coil. The upper/lower claw-shaped magnetic poles are curved to extend axially downwardly/upwardly from an upper/lower inner edge of the yoke portion, respectively. The upper and the low claw-shaped magnetic poles are alternately arranged along a circumferential direction of the iron core. The yoke portion has cutout portions formed in non-magnetic path regions which do not include magnetic paths through which magnetic flux flows between neighboring claw-shaped magnetic poles across the annular coil.

Abstract: A pump includes an impeller for sucking and discharging liquid, a pump case having a suction port and a discharge port through which the liquid is sucked and discharged, and a partition cooperating with the pump case to form a pump chamber in which the impeller is rotatably received. The pump is further includes a rotor having a magnet for rotatingly driving the impeller and a stator having claw-shaped magnetic poles for applying a rotational driving force to the rotor, the rotor and the stator constituting a claw pole type motor that serves as a driving power source of the pump. At least the stator is entirely coated with a molded resin.

Abstract: A vane pump includes a rotor chamber; a rotor eccentrically accommodated in the rotor chamber; a plurality of vanes attached to the rotor, each vane having a leading end adapted to make sliding contact with an inner peripheral surface of the rotor chamber. The vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor, and the vanes; an inlet port through which a working fluid is drawn into a working compartment; and an outlet port through which the working fluid is discharged from a working compartment. An engaging portion is formed in a peripheral end portion of a thrust surface of the rotor and an engaged portion with which the engaging portion engages in a non-contact state is formed in an inner surface region of the rotor chamber facing the thrust surface of the rotor in a non-contact state.

Abstract: A magnet drive rotary vane pump has a casing with a pump cavity. A rotor carrying a plurality of vanes is disposed within the pump cavity to be rotatable about an eccentric axis with respect to the pump cavity for drawing the fluid into the pump cavity and expelling it out of the pump cavity. The rotor is configured to have a rotor magnet which is magnetically coupled to a stator magnet mounted on the casing outwardly of the pump cavity for driving the rotor. The rotor magnet is configured to have its major portion disposed in an overlapping relation with the stator magnet. Thus, the rotor magnet can be mechanically isolated from the stator magnet disposed outside of the casing to establish a sealless coupling therebetween for realizing leakage free pump.

Abstract: A vane pump includes a rotor accommodated in a rotor chamber; a plurality of vanes attached to the rotor, each of the vanes having a leading end adapted to make sliding make a contact with an inner peripheral surface of the rotor chamber. Further, the vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor and the vanes, the working compartments being adapted to undergo a volume change as the rotor is rotatably driven; an inlet port through which a working fluid is drawn into a working compartment whose volume is being increased; and an outlet port through which the working fluid is discharged from a working compartment whose volume is being decreased; and one or more blade base members protruded from portions on the outer peripheral surface of the rotor between the vanes adjacent to each other.

Abstract: A vane pump includes a rotor chamber; a rotor accommodated in the rotor chamber; a plurality of vanes attached to the rotor, each vane having a leading end adapted to make sliding contact with an inner peripheral surface of the rotor chamber. The vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor and the vanes; an inlet port through which a working fluid is drawn into a working compartment; and an outlet port through which the working fluid is discharged from a working compartment. A cutout portion is formed in a leading end portion of each vane on each of at least one of a leading and a trailing side of the leading end portion, the leading end of each vane having a width smaller than that of a base end portion of each vane.