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公开(公告)号：JPH06212930A
公开(公告)日：1994-08-02
申请号：JP688593
申请日：1993-01-19
Applicant: TOYOTA MOTOR CORP
Inventor： YASUDA YUJIRO , KIDO YOSHIO
Abstract: PURPOSE:To prevent the occurrence of adhesision and scuffing between the wall surface of a pin hole and a piston pin on both ends of a piston pin in a piston pin bearing for a two-cycle engine. CONSTITUTION:A gap between the outer periphery of a piston pin 3 and the inner surface of a pin hole 2 is set such that the gap in both ends of the piston pin is larger than that in the central part side of the piston pin, while a lube oil supply path 7 for supplying lube oil to the gap part 11 from a cooling channel 6 of a piston 1 is provided. Since a squeeze oil film effect is generated in the lube oil in the gap part 11 to increase oil film load capacity in the compression and explosion strokes of the piston deformed by a load, adhesion and scuffing on both ends of the piston pin are prevented.
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公开(公告)号：JPH041463A
公开(公告)日：1992-01-06
申请号：JP9932090
申请日：1990-04-17
Applicant: TOYOTA MOTOR CORP , NIPPON DENSO CO
Inventor： ONO EIJI , NAKAMURA NORIHIKO , ISHIDA YASUHIKO , TANAHASHI TOSHIO , YASUDA YUJIRO , ITO TOSHIO , KANAMARU MASANOBU , YAMAZAKI SUEHIRO , TAKEDA HIDETO , RI NOBUO
Abstract: PURPOSE:To spray an amount of fuel necessary at time of idling as well as to make all the sprayed fuel subject to vacuum boiling so favorably by setting the capacity of a fuel sump to be almost equal to that occupied by fuel when a fuel injection quantity is minimized. CONSTITUTION:Low pressure fuel supplied to a fuel inflow port 42 is fed into a fuel chamber 44 in a housing body 21 by way of the inside of a filter 43 and the circumference of a movable core 36. Next, it is fed into a fuel sump 40 by way of a fuel passage between a needle 31 and a needle insert hole 30 and a fuel measuring throttle passage 39. Then, a solenoid 23a is energized, the movable core 36 moves toward the needle 31, and when a valve element 33 separates from a valve seat 32, fuel is spouted into a combustion chamber 5. In this case, capacity of a fuel sump 40 should be set to be almost equal to that at a time when a fuel injection quantity is minimized. At time of idling, almost all the fuel heated at the very limit of boiling temperature, in the fuel sump 40, is sprayed.
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公开(公告)号：JPH06185411A
公开(公告)日：1994-07-05
申请号：JP33764592
申请日：1992-12-17
Applicant: TOYOTA MOTOR CORP , NIPPON DENSO CO , NOK CORP
Inventor： NAKADA KOICHI , YASUDA YUJIRO , MOGI KAZUHISA , MAEDA AKIHIRO , KIYOMURA MASAHIRO
Abstract: PURPOSE:To completely melt at least a heat accumulating material of a solid state in a heat accumulating material container positioned most upstream even when an internal combustion engine is operated only for a short time. CONSTITUTION:In a cooling water passage 4, a bypass passage 26 is provided for connecting upstream of a second heat accumulating material container 12 to a fourth heat accumulating material container 14 in a communication state. A first solenoid valve 21 for opening/closing the bypass passage 26 is provided. In the cooling water passage 4, a fourth solenoid valve 24 is arranged for opening/closing a bypassed part from a position, to which an upstream end of the bypass passage 26 is connected, to a position to which a downstream end thereof is connected. A first temperature sensor for detecting complete melting of a heat accumulating material 15 in a first heat accumulating material container 11 is provided. A controller 35 keeps the first solenoid valve 21 opened and the fourth solenoid valve 24 closed until complete melting after engine warming up is detected, and closes the first solenoid valve 21 and opens the fourth solenoid valve 24 after the complete melting is detected.
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公开(公告)号：JPH0249921A
公开(公告)日：1990-02-20
申请号：JP5634289
申请日：1989-03-10
Applicant: TOYOTA MOTOR CORP
Inventor： YASUDA YUJIRO , NAKAMURA NORIHIKO , TANAHASHI TOSHIO , UMEHANA TOYOICHI , TATE TAKAO , NOGUCHI HIROSHI , KOBAYASHI TATSUO , NIHEI HIROAKI
Abstract: PURPOSE:To suppress generation of NOx by furnishing two air supply passages coupled with a combustion chamber via respective air supply valves, forming a mask wall along that peripheral part of each air supply valve on its exhaust valve side, and by arranging an air supply control valve closing at low load on No.2 air supply passage. CONSTITUTION:No.1, No.2 air supply valves 6a, 6b are arranged on an inner wall surface portion 3b constituting a bottom wall surface of a groove 5, which is provided on the inner wall surface 3a of a cylinder head 3, and No.1, No.2 exhaust valves 7a, 7b are arranged in an approx. flat inner wall surface portion 3c except the mentioned groove 5. These wall surface portions 3b, 3c are connected together via the surrounding wall 9 of this groove 5, but this surrounding wall 9 is positioned very close to the peripheries of the abovementioned air supply valves 6a, 6b, being composed of a pair of mask walls 9a stretching in the form of a circular arc along their perimeters and also new air guide walls 9b, 9c. An air supply control valve, not illustrated, closed when the engine bears a low load is interposed on No.2 air supply passage in communication with No.2 air supply port 12b.
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公开(公告)号：JPH01277619A
公开(公告)日：1989-11-08
申请号：JP10430188
申请日：1988-04-28
Applicant: TOYOTA MOTOR CORP
Inventor： YASUDA YUJIRO , YAMAZAKI SUEHIRO , TAKANO TADASHI
Abstract: PURPOSE:To prevent the generation of knocking by allowing a gap in which the fresh air flows to be formed between a mask wall and the peripheral edge part of an air feeding valve, when the lift quantity of the air feeding valve is small and preventing the flow of the fresh air between the mask wall and the peripheral edge part of the air feeding valve when the lift quantity of the air feeding valve is large. CONSTITUTION:When an air feeding valve 6 is at the max. lift position, the peripheral edge part of the air feeding valve 6 is set cose to a mask wall 9a, and the fresh air does not flow between the peripheral edge part of the air feeding valve 6 and the mask wall 9a. Further, when the lift quantity of the air feeding valve 6 is small, a gap is formed between the peripheral edge part of the air feeding valve 6 and the mask wall 9a, and the fresh air flows between the peripheral edge part of the air feeding valve 6 and the mask wall 9a. Therefore, the whole in a combustion chamber can be scavenged, and the generation of knocking in the high speed operation can be prevented.
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Patent Agency Ranking
公开(公告)号：JPH10252512A
公开(公告)日：1998-09-22
申请号：JP5962497
申请日：1997-03-13
Applicant: TOYOTA MOTOR CORP
Inventor： YASUDA YUJIRO
IPC: F02B1/14 , F02B1/12 , F02D13/02 , F02D41/04 , F02D41/34 , F02D41/40 , F02D45/00 , F02M25/07 , F02M63/00
Abstract: PROBLEM TO BE SOLVED: To spread a stable combustion region in a compressed ignition internal combustion engine. SOLUTION: A maximum injection amount without generating knocking when fuel is injected only from a port injection valve 15 is set as a reference injection amount, its corresponding load amount is set to a reference load amount, in a load region of the reference load amount or less, fuel of total amount of necessary injection is injected from the port injection valve 15 during an intake stroke on and after the top dead center of a piston 5, and so as to increase a valve open overlap period of an intake/exhaust valve 8, 9 in accordance with decreasing of a load, an open/close timing variable means is controlled. An internal EGR amount is increased in accordance with decreasing of a load, an intake heating effect is increased, self ignitability in a light load region is improved, a stable combustion region in a light load side is spread from in the past.
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公开(公告)号：JPH04234526A
公开(公告)日：1992-08-24
申请号：JP11691
申请日：1991-01-07
Applicant: TOYOTA MOTOR CORP
Inventor： KANAMARU MASANOBU , YASUDA YUJIRO , ITO TOSHIO , MASUBUCHI MASAHIKO
Abstract: PURPOSE:To ensure good combustion while reducing pumping loss in a 4-cycle internal combustion engine. CONSTITUTION:Exhaust valves 7 and 8 are opened until the middle period of an intake stroke, and an exhaust gas is made to flow backward into a combustion chamber 4 in the first half of the intake stroke. One side exhaust passage 10 is extended in a tangent line to the peripheral wall surface of the combustion chamber 4, an exhaust control valve 22 is provided in the other side exhaust passage 9, and the exhaust control valve 22 is closed at the time of a low load or an engine low-temperature. Closing the exhaust control valve 22 causes turning a back flow exhaust gas around a cylinder shaft line in the combustion chamber 4, gathering an exhaust gas Y on a piston 2 top face in the latter half of an intake stroke, and gathering an air-fuel mixture Z on the upper part of the combustion chamber 4. The exhaust control valve 22 is fully opened at the time of a high load or of a high load in an engine high- temperature. At that time, much exhaust gas flows reversely, and this reduces pumping loss.
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公开(公告)号：JPH03222862A
公开(公告)日：1991-10-01
申请号：JP12422690
申请日：1990-05-16
Applicant: TOYOTA MOTOR CORP , NIPPON DENSO CO
Inventor： ONO EIJI , YASUDA YUJIRO , NAKAMURA NORIHIKO , TANAHASHI TOSHIO , ISHIDA YASUHIKO , TAKEDA HIDETO , RI NOBUO
Abstract: PURPOSE:To enable to perform extensive control over a fuel injection valve and its fine adjustment by installing a stopper member for regulating the maximum lift of a needle, and making the maximum lift position of the needle variable with this stopper member moved in the axial direction by an actuator. CONSTITUTION:A stopper member 10 seatable on an inner end face of a nozzle holder 3 is slidably inserted in and around a needle 6 inserted into this nozzle holder 3 installed in the tip part of a fuel injection valve body 1. A spring retainer 11 is fitted in and around the needle 6 at the upper part of a small diametral upper end 10c of this stopper member 10, then the needle 6 is energized upward by dint of a compression spring 14 interposed between the spring retainer and this stopper member 10. Then, the needle 6 is made shiftable downward via a movable core 15 at time of energizing a first exciting coil 18, through which a nozzle 4 is opened. In addition, the stopper member 10 is made shiftable upward at time of energizing a second exciting coil 31, through which the maximum lift of the needle 6 is decreased.
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公开(公告)号：JPH01280627A
公开(公告)日：1989-11-10
申请号：JP14562788
申请日：1988-06-15
Applicant: TOYOTA MOTOR CORP
Inventor： YASUDA YUJIRO , YAMAZAKI SUEHIRO , KOBAYASHI TATSUO , UMEHANA TOYOICHI , TATE TAKAO , NIHEI HIROAKI
Abstract: PURPOSE:To improve ignitability specially at the time of low load operation by forming an electrode chamber in a recess caved between intake/exhaust valves on the inner wall of a cylinder head, making the electrode of an ignition plug face the recess and forming a mask provided with a guide passage between the electrode chamber and the intake valve. CONSTITUTION:An electrode chamber 24 is formed by caving a part, lower than the other part, between a intake valve 17 and an exhaust valve 18 on the inner wall 2a of a cylinder head and an ignition plug 22 is arranged by facing an electrode thereto. The electrode chamber 24 is to be a nearly cylindrical space and a concave spherical reflecting face 25 is formed on a part of the inner wall. A fuel injection valve 32 is housed in a horizontal hole 31, as a cylinder head, formed at the lower side of an intake port 16 and its injecting direction is pointed to the reflecting face 25. Further, a mask wall 33 having a cylindrical wall 34 along the edge portion of the valve head 17a of the intake valve 17 is formed between the electrode chamber 24 and the intake port 16 and also a guide passage 35 connecting the reflecting face 25 with the horizontal hole 31 is bored at the mask wall 33.
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公开(公告)号：JPH11210539A
公开(公告)日：1999-08-03
申请号：JP1916098
申请日：1998-01-30
Applicant: TOYOTA MOTOR CORP
Inventor： TANAHASHI TOSHIO , YASUDA YUJIRO , ASADA TOSHIAKI , MURAI TOSHIMI
IPC: F02P5/15 , F01L1/34 , F01N3/20 , F01N3/28 , F01N13/04 , F02B1/04 , F02B1/12 , F02B3/06 , F02B11/00 , F02B17/00 , F02B23/06 , F02B23/10 , F02B33/38 , F02B33/44 , F02B75/12 , F02D13/02 , F02D15/00 , F02D21/08 , F02D23/00 , F02D37/02 , F02D41/02 , F02D41/14 , F02D41/30 , F02D41/38 , F02D43/00 , F02D45/00 , F02F3/26 , F02M25/07 , F02M69/04
Abstract: PROBLEM TO BE SOLVED: To perform gentle combustion generating less NOx by determining whether a gas temperature inside a combustion chamber in a compression stroke terminal stage is within a target-temperature range causing self-firing by ignition, or not and controlling the gas temperature inside the combustion chamber within the target temperature range on the basis of the determination result. SOLUTION: During a medium load operation, when a gas temperature inside a combustion chamber 4 ranges from 800 deg.K to 1000 deg.K in an ignition time in a compression stroke terminal stage, self-firing combustion is caused by ignition. In a high load operation area, the gas temperature can be controlled within the range of 800-1000 deg.K, even if a compression ratio is increased to such an extent that the gas temperature inside the combustion chamber 4 does not exceed a lower limit temperature T1, so that self-firing combustion can be caused by ignition. Then, it is determined whether a gas temperature inside the combustion chamber 4 reaches the temperature allowing self-firing based on ignition or not, and on the basis of the determined result, valve opening timing of an intake valve 5 is controlled by means of a valve timing device 6, so that the gas temperature inside the combustion chamber 4 can be kept at a temperature at which self-firing is caused by ignition.
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