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1. 发明专利

JP2000060176A BRUSH-LESS MOTOR DRIVE GEAR AND BRUSHLESS MOTOR 失效
公开(公告)号：JP2000060176A
公开(公告)日：2000-02-25
申请号：JP22096198
申请日：1998-08-05
申请人： NIPPON SOKEN , DENSO CORP
发明人： ASA HIROTOMO , TAKEDA KENJI , TARUI ATSUSHI , SHIBATA TOKUAKI
IPC分类号： H02K29/00 , H02K26/00 , H02P6/10
摘要： PROBLEM TO BE SOLVED: To generate flat state in the torque characteristic of a brushless motor. SOLUTION: When the number of poles (number of slots) of a stator is 6 and a number of poles (number of permanent magnets) of a rotor is 8 in a three-phase brushless motor, the coil current of each phase is shifted by a phase at each 12 deg. for electrical angle (mechanical angle of 30 deg.), and also the coil current of each phase is switched in a step state at the same time with three phases by each 60 deg. of electrical angle (mechanical angle of 15 deg.). Here, when I is the coil current for one phase maximized of the three phases, the coil current of the rest of two phases is controlled so as to be -I/2 respectively. In a brushless motor other than the above number of poles, an angle θ switched in a step state of the coil current of each phase is set to 360/N [ deg.] (where, N is the least common multiple of number of poles of stator and rotor) of mechanical angle. In this way, a flat torque characteristic can be obtained over full angle range.

2. 发明专利

JPH1172166A EXHAUST GAS REFLUX CONTROL VALVE 失效
公开(公告)号：JPH1172166A
公开(公告)日：1999-03-16
申请号：JP33134497
申请日：1997-12-02
申请人： DENSO CORP
发明人： WATAKABE KAZUYOSHI , SHIBATA TOKUAKI
IPC分类号： F02M25/07 , F16K1/44 , F16K31/06
摘要： PROBLEM TO BE SOLVED: To prevent valve leakage by an assembling error and a thermal expansion difference, and reduce a driving load in a double seat valve system exhaust gas reflux control(EGR) valve. SOLUTION: Two valve seats 22 and 23 are arranged in a valve housing 21 so as to be vertically opposed to each other, and a single valve shaft 32 is penetrated through the center of both valve seats 22 and 23, and two valve elements 36 and 37 are fixed to the valve shaft 32. The lower valve element 37 is thickly formed of heat resistant/abrasion resistant metal, but the upper valve element 36 is formed of a heat resistant/abrasion resistant elastic plate material such as a thin stainless steel plate so as to be elastically deformable. In this constitution, even if an interval between both valve elements 36 and 37 and an interval between both valve seats 22 and 23 do not accurately coincide with each other by an assembling error and a thermal expansion difference, its error can be absorbed by elastic deformation of the upper valve element 36, the two valve elements 36 and 37 can be reliably seated on the two valve seats 22 and 23, and valve leakage can be reliably prevented.

3. 发明专利

JPH11350930A TWO-FLUID MIXING AND DISCHARGE UNIT 失效
公开(公告)号：JPH11350930A
公开(公告)日：1999-12-21
申请号：JP15826398
申请日：1998-06-08
申请人： DENSO CORP , KYOSAN DENKI KK
发明人： SHIBATA TOKUAKI , HIYAKUTO KAZUO , KIMURA AKIHIRO , FURUKAWA MIKI
IPC分类号： F01M3/00 , F02M37/00 , F02M37/06 , F02M37/08
摘要： PROBLEM TO BE SOLVED: To maintain a constant mixture ratio of two kinds of fluid by eliminating influence of change in fluid viscosity and back pressure due to temperature change. SOLUTION: Oil mixed fuel which is discharged from a mixing pump 11 is temporarily stored in a mixed fluid tank 45. When a large amount of fluid is stored in the mixed fluid tank 45, the mixing pump 11 is stopped to supply the engine with the oil mixed fuel from the mixed fluid tank 45. Every time the amount of fluid stored in the mixed fluid tank 45 is decreased to the lower limit, it is detected by a fluid level sensor 50, and the mixing pump 11 is operated for a predetermined time. In this case, even if the consumption amount of the oil mixed fuel is changed, necessity is eliminated to change the discharge amount of the mixing pump 11 according thereto, therefore, a driving condition of the mixing pump 11 is fixed to a condition in which sufficient discharge performance is secured even with high fluid viscosity. In addition, since the change in back pressure is absorbed by the mixed fluid tank 45, the back pressure of the mixing pump 11 is maintained at a constant rate.

4. 发明专利

JPH11341779A ROTARY ACTUATOR 失效
公开(公告)号：JPH11341779A
公开(公告)日：1999-12-10
申请号：JP14687198
申请日：1998-05-28
申请人： DENSO CORP
发明人： SHIBATA TOKUAKI , KAJITA YUKINOBU
IPC分类号： H02K33/02
摘要： PROBLEM TO BE SOLVED: To efficiently increase the drive torque of a rotary actuator. SOLUTION: Two systems of closed magnetic circuits which use an iron core part 17 as a common path are constituted, by extending two magnetic path formation parts 19 and 20 form right and left both ends of the iron core part 17 which surrounds a rotating magnet 16. A first magnet 21 and a second magnet 22 are set, so that their n poles and the s poles point in directions opposite to each other, in the gaps provided in the middles of the several magnetic path formation parts 19 and 20, and one coil 23 is wound en block on the two magnetic path formation parts 19 and 20. The magnetic fluxes of the two permanent magnet 21 and 22 become reverse magnetic fluxes within the iron core part 17, and cancel each other. At current applying of the coil 23, in one magnetic path the magnetic flux of the coil 23 and the magnetic flux of one permanent magnet negate each other, and in other magnetic path the magnetic flux of the coil 23 and the magnetic flux of the other permanent magnet flow in the same direction, and both the magnetic fluxes pass through the inside of the iron core part 17.

5. 发明专利

JPH1113928A CONTROL VALVE FOR REFLUX OF EXHAUST GAS 失效
公开(公告)号：JPH1113928A
公开(公告)日：1999-01-22
申请号：JP16828997
申请日：1997-06-25
申请人： DENSO CORP
发明人： WATAKABE KAZUYOSHI , SHIBATA TOKUAKI
IPC分类号： F02M25/07 , F16K31/06 , F16K31/126
摘要： PROBLEM TO BE SOLVED: To prevent the degradation of a diaphragm by the heat of EGR gas. SOLUTION: An air inlet passage 21, a diaphragm chamber 28 divided by a diaphragm 27 and an EGR gas flow-in port 22 are installed in a valve housing 20, and a passage 36 which connects the EGR gas flow-in port 22 and the diaphragm chamber 28 is installed outside of the air inlet passage. When capacity in the diaphragm chamber 28 is changed by vertical displacement of the diaphragm 27 at the time of opening and closing of a valve, air in the diaphragm chamber 28 flows in and out freely through the passage 36, and internal pressure in the diaphragm chamber 28 is maintained always to be identical to the one in the EGR gas flow-in port 22. By increasing capacity in the passage 36 fully with the changing amount in capacity in the diaphragm chamber 28, the inhalation of high temperature EGR gas in the EGR gas flow-in port 22 side into the diaphragm chamber 28 can be prevented, and the degradation and damage of the diaphragm 27 by the heat of EGR gas can be prevented.

6. 发明专利

JPH1113447A TWO-LIQUID MIXING AND DISCHARGING APPARATUS 失效
公开(公告)号：JPH1113447A
公开(公告)日：1999-01-19
申请号：JP16643997
申请日：1997-06-24
申请人： DENSO CORP
发明人： SHIBATA TOKUAKI , WATAKABE KAZUYOSHI
IPC分类号： F01M3/00 , B01F15/04 , G05D11/02
摘要： PROBLEM TO BE SOLVED: To compactly integrate a mixing function for mixing two kinds of liquid at a specific mixture ratio with a discharging function and to mechanically and automatically control a discharge amount of the mixed liquid. SOLUTION: A plunger 20 inserted into a solenoid 13 is urged by a spring 22 to an opposite direction to a driving direction of the solenoid 13 when the solenoid 13 is supplied with a current. On both axial sides of the solenoid 13, two pump chambers 18, 19 are disposed to suck/discharge fuel and oil by reciprocating motion of the plunger 20. On a side of discharge ports 26, 34 of the pump chambers 18, 19, a mixing chamber 38 is disposed to discharge the fuel and oil discharged from the pump chambers 18, 19 while mixing them. When load pressure applied to the pump chamber 18 increases to overcome the repulsive force of the spring 22, the plunger 2 is pressed down and fixed at a position at the time when the solenoid 13 is energized. Then, operation of the pumps 24, 32 stops to automatically prevents excessive supply of oil-mixed fuel.

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