Patents by Inventor Makoto Okawa
Makoto Okawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10738733Abstract: An internal combustion engine includes: a cylinder block including a bulkhead formed so as to separate adjacent cylinders; a crankshaft including a counterweight; and a gas-vent hole which is formed in the bulkhead within a radius of rotation of the counterweight when seen from below a piston bottom-dead-center position and an axial direction of the crankshaft, and which communicates between the adjacent cylinders. The counterweight includes at least one of a concave portion and a through-hole formed at at least a part of a region of the counterweight opposed to the gas-vent hole during rotation of the crankshaft. The concave portion hollows in a direction away from the gas-vent hole, the through-hole penetrating through the counterweight in a direction away from the gas-vent hole.Type: GrantFiled: December 21, 2018Date of Patent: August 11, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Naoya Ikeda, Makoto Okawa
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Patent number: 10520060Abstract: An internal combustion engine includes: three or more cylinders including cylinders A, B and C according to the present disclosure arranged in a row in the cylinder row direction; and a balancer device for reducing engine vibration. The balancer device includes a balancer shaft arranged so as to extend from the cylinder A to the cylinder C along the cylinder row direction in a crank chamber. The balancer shaft includes: a first opening formed on the outer surface of the balancer shaft at a first location associated with the cylinder A in the cylinder row direction; a second opening formed on the outer surface at a second location associated with the cylinder C in the cylinder row direction; and a communication passage formed inside the balancer shaft so as to connect the first opening with the second opening.Type: GrantFiled: November 12, 2018Date of Patent: December 31, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Makoto Okawa, Naoya Ikeda
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Publication number: 20190249619Abstract: An internal combustion engine includes: a cylinder block including a bulkhead formed so as to separate adjacent cylinders; a crankshaft including a counterweight; and a gas-vent hole which is formed in the bulkhead within a radius of rotation of the counterweight when seen from below a piston bottom-dead-center position and an axial direction of the crankshaft, and which communicates between the adjacent cylinders. The counterweight includes at least one of a concave portion and a through-hole formed at at least a part of a region of the counterweight opposed to the gas-vent hole during rotation of the crankshaft. The concave portion hollows in a direction away from the gas-vent hole, the through-hole penetrating through the counterweight in a direction away from the gas-vent hole.Type: ApplicationFiled: December 21, 2018Publication date: August 15, 2019Inventors: Naoya IKEDA, Makoto OKAWA
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Publication number: 20190219131Abstract: An internal combustion engine includes: three or more cylinders including cylinders A, B and C according to the present disclosure arranged in a row in the cylinder row direction; and a balancer device for reducing engine vibration. The balancer device includes a balancer shaft arranged so as to extend from the cylinder A to the cylinder C along the cylinder row direction in a crank chamber. The balancer shaft includes: a first opening formed on the outer surface of the balancer shaft at a first location associated with the cylinder A in the cylinder row direction; a second opening formed on the outer surface at a second location associated with the cylinder C in the cylinder row direction; and a communication passage formed inside the balancer shaft so as to connect the first opening with the second opening.Type: ApplicationFiled: November 12, 2018Publication date: July 18, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Makoto OKAWA, Naoya IKEDA
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Patent number: 9976495Abstract: In the present invention, an internal combustion engine is provided with a variable-compression-ratio mechanism with a variable mechanical compression ratio and the variable-compression-ratio mechanism comprises a drive device for changing the volume of a combustion chamber when a piston reaches top dead center. The drive device comprises a reverse input blocking clutch disposed in a drive power transmission path for transmitting the rotational force of a rotator. A control device estimates the reverse input torque applied to an output shaft of the reverse input blocking clutch and sets a gradient for torque output by the rotator and a continuation duration for continuing the torque increase on the basis of the reverse input torque.Type: GrantFiled: March 12, 2015Date of Patent: May 22, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Makoto Okawa, Kazuhito Sakai
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Patent number: 9926888Abstract: An internal combustion engine is provided. The internal combustion engine includes a supercharger that is arranged in an intake passage; an intercooler that is arranged downstream of the supercharger in a direction of intake air flow, in the intake passage; and a blow-by gas returning apparatus. The blow-by gas returning apparatus includes a bypass passage, an ejector, and a blow-by gas passage. The bypass passage connects a first position that is arranged between the supercharger and the intercooler, and a second position that is arranged downstream of the intercooler of the intake passage together. The ejector is arranged in the bypass passage, and configured to draw in blow-by gas from the crankcase through the blow-by gas passage when air flows through the bypass passage from the first position toward the second position.Type: GrantFiled: May 20, 2016Date of Patent: March 27, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Makoto Okawa, Kazuhito Sakai
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Patent number: 9845724Abstract: An internal combustion engine comprises a variable compression ratio mechanism that changes the relative position of a cylinder block with respect to a crankcase and a controlling device that controls the variable compression ratio mechanism. The variable compression ratio mechanism contains a driving device that rotates a shaft that includes an eccentric axis, and the drive device includes a clutch that blocks reverse input and is disposed in a drive power transmission route that transmits the rotational power of a motor to the shaft. The control device fixes the mechanical compression ratio to a predetermined low mechanical compression ratio when the amplitude of the rotational power vibration applied to an output shaft of the clutch is less than a predetermined determination value.Type: GrantFiled: November 18, 2014Date of Patent: December 19, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Makoto Okawa, Kazuhito Sakai
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Patent number: 9784637Abstract: An adsorption characteristic measuring apparatus is configured to: acquire a unit-time leak pressure value from a pressure increase value of an internal pressure value of a sample tube caused by an non-adsorption gas leaking from the outside of a fitting portion into an inner space of the sample tube; acquire a pressure value at which a temporal change of the internal pressure value of the sample tube assumes an equilibrium state when an adsorption gas present in the reference volume portion is supplied into the sample tube and the sample tube is in a closed state; calculate a pressure value after correction of a real leak pressure value is performed on a measured equilibrium pressure value, as a true equilibrium pressure value, the real leak pressure value being obtained in such a manner that the unit-time leak pressure value is multiplied by a leak time; and calculate an adsorption isotherm.Type: GrantFiled: October 21, 2015Date of Patent: October 10, 2017Assignees: National Institute of Advanced Industrial Science and Technology, MicrotracBEL Corp.Inventors: Akira Endo, Marie Shimomura, Satoshi Taniguchi, Kazuyuki Nakai, Masayuki Yoshida, Makoto Okawa
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Publication number: 20170211488Abstract: In the present invention, an internal combustion engine is provided with a variable-compression-ratio mechanism with a variable mechanical compression ratio and the variable-compression-ratio mechanism comprises a drive device for changing the volume of a combustion chamber when a piston reaches top dead center. The drive device comprises a reverse input blocking clutch disposed in a drive power transmission path for transmitting the rotational force of a rotator. A control device estimates the reverse input torque applied to an output shaft of the reverse input blocking clutch and sets a gradient for torque output by the rotator and a continuation duration for continuing the torque increase on the basis of the reverse input torque.Type: ApplicationFiled: March 12, 2015Publication date: July 27, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Makoto OKAWA, Kazuhito SAKAI
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Publication number: 20160341154Abstract: An internal combustion engine is provided. The internal combustion engine includes a supercharger that is arranged in an intake passage; an intercooler that is arranged downstream of the supercharger in a direction of intake air flow, in the intake passage; and a blow-by gas returning apparatus. The blow-by gas returning apparatus includes a bypass passage, an ejector, and a blow-by gas passage. The bypass passage connects a first position that is arranged between the supercharger and the intercooler, and a second position that is arranged downstream of the intercooler of the intake passage together. The ejector is arranged in the bypass passage, and configured to draw in blow-by gas from the crankcase through the blow-by gas passage when air flows through the bypass passage from the first position toward the second position.Type: ApplicationFiled: May 20, 2016Publication date: November 24, 2016Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Makoto OKAWA, Kazuhito SAKAI
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Publication number: 20160319736Abstract: An internal combustion engine comprises a variable compression ratio mechanism that changes the relative position of a cylinder block with respect to a crankcase and a controlling device that controls the variable compression ratio mechanism. The variable compression ratio mechanism contains a driving device that rotates a shaft that includes an eccentric axis, and the drive device includes a clutch that blocks reverse input and is disposed in a drive power transmission route that transmits the rotational power of a motor to the shaft. The control device fixes the mechanical compression ratio to a predetermined low mechanical compression ratio when the amplitude of the rotational power vibration applied to an output shaft of the clutch is less than a predetermined determination value.Type: ApplicationFiled: November 18, 2014Publication date: November 3, 2016Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Makoto OKAWA, Kazuhito SAKAI
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Publication number: 20160109321Abstract: An adsorption characteristic measuring apparatus is configured to: acquire a unit-time leak pressure value from a pressure increase value of an internal pressure value of a sample tube caused by an non-adsorption gas leaking from the outside of a fitting portion into an inner space of the sample tube; acquire a pressure value at which a temporal change of the internal pressure value of the sample tube assumes an equilibrium state when an adsorption gas present in the reference volume portion is supplied into the sample tube and the sample tube is in a closed state; calculate a pressure value after correction of a real leak pressure value is performed on a measured equilibrium pressure value, as a true equilibrium pressure value, the real leak pressure value being obtained in such a manner that the unit-time leak pressure value is multiplied by a leak time; and calculate an adsorption isotherm.Type: ApplicationFiled: October 21, 2015Publication date: April 21, 2016Inventors: Akira ENDO, Marie SHIMOMURA, Satoshi Taniguchi, Kazuyuki NAKAI, Masayuki YOSHIDA, Makoto OKAWA
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Publication number: 20080217236Abstract: The present invention provides a cartridge type oil filter including a case having a container section and a cover section that are integrated with each other; a filter element housed in the case; and ceramics bodies disposed at a position separated from an oil filtration surface of the filter element in the case.Type: ApplicationFiled: September 5, 2007Publication date: September 11, 2008Applicant: JAPAN CERAMIC DEVICE CO., LTD.Inventors: Takeshi Shimizu, Makoto Okawa, Masaru Takechi