Motor-Mounted Internal Gear Pump and Electronic Equipment

Abstract

A motor-mounted internal gear pump 80 includes: a pump part 81 which sucks and discharges hydraulic fluid; and a motor part 82 which drives the pump 81 . The pump part 81 includes: an inner rotor 1 with teeth on its outer surface; an outer rotor 2 with teeth on its inner surface to mesh with the teeth of the inner rotor; and pump casings 3, 4 which house the inner rotor 1 and the outer rotor 2 . The motor part 82 includes a rotator 11 and a stator 12 which rotates the rotator 11 . A common member 112 of permanent magnet material as resin containing magnetic powder serves as the rotator 11 and the outer rotor 2 . This structure assures further inexpensiveness and reliability while maintaining compactness and inexpensiveness in functions.

1 . A motor-mounted internal gear pump, comprising:
 a pump part which sucks and discharges hydraulic fluid; and   a motor part which drives the pump part,   the pump part including:
 an inner rotor with teeth on its outer surface;
 an outer rotor with teeth on its inner surface to mesh with the teeth of the inner rotor; and 
 
 a pump casing which houses the inner rotor and the outer rotor; and the motor part including:
 a rotator; and 
 a stator which rotates the rotator, 
 
   wherein a common member of permanent magnet material as resin containing magnetic powder serves as the rotator and the outer rotor.   
   
   
       2 . The motor-mounted internal gear pump according to  claim 1 ,
 wherein: water or a liquid containing water as an ingredient is used as hydraulic fluid which is sucked and discharged by the pump part; and   the common member for the rotator and the outer rotor is made of ferrite bond magnet containing ferrite magnetic powder.   
   
   
       3 . The motor-mounted internal gear pump according to  claim 1 ,
 wherein: the common member for the rotator and the outer rotor is formed as a member whose magnetic force is strong on its outer surface side and weak on its inner surface side; and   the stator is located around and outside the common member.   
   
   
       4 . The motor-mounted internal gear pump according to  claim 2 ,
 wherein an antifreeze liquid containing water and an organic substance is used as the hydraulic fluid.   
   
   
       5 . The motor-mounted internal gear pump according to  claim 2 ,
 wherein the common member is made of PPS/ferrite bond magnet as PPS resin containing ferrite magnetic powder.   
   
   
       6 . The motor-mounted internal gear pump according to  claim 2 ,
 wherein: the pump casing consists of two casings, a first casing and a second casing which are connected;   shoulder sections protruding inward are formed on the first casing and the second casing respectively in a way to face each other;   annular bracket sections axially extending from the inner teeth are formed at both sides of the outer peripheral part of the common member;   the annular bracket sections are fitted to the outer surfaces of the respective shoulder sections of the first casing and the second casing; and   the stator is located around and outside the common member.   
   
   
       7 . The motor-mounted internal gear pump according to  claim 2 ,
 wherein the pump casing is made of PPS carbon fiber resin as PPS resin containing carbon fiber or PPS glass fiber resin as PPS resin containing glass fiber.   
   
   
       8 . The motor-mounted internal gear pump according to  claim 2 ,
 wherein the inner rotor is made of PPS carbon fiber resin as PPS resin containing carbon fiber, or POM resin.   
   
   
       9 . The motor-mounted internal gear pump according to  claim 6 ,
 wherein the first casing and the second casing are made of PPS carbon fiber resin as PPS resin containing carbon fiber.   
   
   
       10 . The motor-mounted internal gear pump according to  claim 9 ,
 wherein: an outer peripheral part of either of the first casing and the second casing is extended axially to form a can for sealing between the rotator and the stator; and   the stator is fitted outside the can.   
   
   
       11 . A motor-mounted internal gear pump, comprising:
 a pump part which sucks and discharges hydraulic fluid; and   a motor part which drives the pump part,   the pump part including:
 an inner rotor with teeth on its outer surface;
 an outer rotor with teeth on its inner surface to mesh with the teeth of the inner rotor; and 
 
 a pump casing which houses the inner rotor and the outer rotor; and the motor part including:
 a rotator; and 
 a stator which rotates the rotator, 
 
   wherein the rotator is made of PPS resin/ferrite bond magnet as PPS resin containing ferrite magnetic powder.   
   
   
       12 . The motor-mounted internal gear pump according to  claim 11 ,
 wherein: the pump casing is made of PPS carbon fiber resin as PPS resin containing carbon fiber; and   the inner rotor is made of PPS carbon fiber resin as PPS resin containing carbon fiber.   
   
   
       13 . Electronic equipment,
 wherein the motor-mounted internal gear pump according to  claim 1  is mounted as a liquid circulation source and an antifreeze liquid composed of water and an organic substance is used as the hydraulic fluid.