Patents by Inventor Koji Kiyooka
Koji Kiyooka 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: 12179514Abstract: Disclosed is a power transmission unit including a motor case that is provided on the same side as a second axle with respect to a center between a first axle and the second axle, separated to right and left, in a right-left direction and that houses the electric motor, a first axle case housing a reduction gear mechanism, a differential gear mechanism, and the first axle, and a second axle case that is fixed to the first axle case in a separable manner and houses the second axle.Type: GrantFiled: March 31, 2023Date of Patent: December 31, 2024Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Koji Kiyooka, Ryo Motooka, Ken Morishita, Hitoshi Sawada, Akihiro Ima
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Patent number: 12173791Abstract: [Problem] A power transmission unit that improves quietness of a gear mechanism and prevents a size of the unit from increasing when a brake rotor is installed around an input shaft of the gear mechanism. [Solution] The power transmission unit includes an electric driving motor with a motor shaft, a gear mechanism, and an output shaft, which are accommodated in a transmission housing, wherein the power of the motor shaft is transmitted to the output shaft via the gear mechanism. The gear mechanism has a gear shaft rotatably supported on the transmission housing and a first helical gear provided on the gear shaft. The power transmission unit further includes a connecting member provided with a tubular portion fitted to the motor shaft and the gear shaft so as to allow the motor shaft and the gear shaft to synchronously rotate. The connecting member is integrally provided with a brake rotor on the outer periphery thereof.Type: GrantFiled: February 24, 2023Date of Patent: December 24, 2024Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Koji Kiyooka, Ryo Motooka, Ken Morishita, Hitoshi Sawada, Akihiro Ima
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Patent number: 12062971Abstract: A moving body driving unit includes: a casing; an electric motor placed in a motor storage portion formed in an inner side of the casing on one side in a first direction which is predetermined and that has a motor shaft which extends in the first direction; a gear device placed in a gear storage portion formed in the inner side of the casing on the other side in the first direction and which also functions as an oil reservoir; a motive power transmitting mechanism placed at the inner side of the casing and that transmits motive power between the motor shaft and the gear device; an oil passage that interconnects the motor storage portion and the gear storage portion at the inner side of the casing; an oil introduction port; an oil discharge port; and an external oil path.Type: GrantFiled: January 21, 2020Date of Patent: August 13, 2024Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Koji Kiyooka, Takashi Nishizawa, Kousaku Kita, Tasuku Inoue, Tatsuya Kamada
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Patent number: 12005787Abstract: A lawn mower includes a traveling driver, a mower motor, and at least one controller. At least one controller is configured to control the traveling driver in accordance with an operation of a user getting on the lawn mower, control the traveling driver to cause the lawn mower to travel autonomously, on a basis of information detected on the lawn mower, and control the mower motor. The lawn mower includes a lawn detection device configured to detect a condition of a portion of lawn on a front side in a traveling direction, and a position acquisition device configured to acquire self-position information. The at least one controller controls the traveling driver in such a manner that the lawn mower preferentially travels on a portion of lawn that needs to be mowed.Type: GrantFiled: September 11, 2020Date of Patent: June 11, 2024Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Koji Kiyooka, Takashi Nishizawa, Hidetaka Yamanami, Shigeaki Nakagawa, Kengo Sasahara, Hikari Morita, Kohei Ogura
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Patent number: 11793113Abstract: A transaxle with a brake of the present invention includes the braking device comprising a plurality of brake discs, fixing plates, and a brake operating member, wherein the brake discs have an inner gear tooth portion that can be fitted to an outer gear tooth portion of an output gear of the motor shaft so as not to rotate relative to the outer gear tooth portion and is slidably fixed in the axial direction of the motor shaft, wherein the fixing plates are fixed to the transaxle casing so as not to rotate relative to each other and are slidably fixed in the axial direction of the motor shaft, and wherein the brake operating member provides a predetermined gap between the fixing plates and the brake discs when the brake discs are not pressed.Type: GrantFiled: December 9, 2021Date of Patent: October 24, 2023Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Mai Terada, Koji Kiyooka
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Publication number: 20230322062Abstract: To achieve a size reduction while making it possible to mold a case housing an axle and a gear mechanism by casting in an electric-vehicle power transmission unit that drives right and left wheels with a single electric motor. [Solution] A power transmission unit 41 includes a motor case 50 that is provided on the same side as a second axle 19 with respect to a center between a first axle 18 and the second axle 19, separated to right and left, in a right-left direction and that houses the electric motor 70, a first axle case 43 housing a reduction gear mechanism 78, a differential gear mechanism 118, and the first axle 18, and a second axle case 130 that is fixed to the first axle case 43 in a separable manner and houses the second axle 19.Type: ApplicationFiled: March 31, 2023Publication date: October 12, 2023Inventors: Koji KIYOOKA, Ryo MOTOOKA, Ken MORISHITA, Hitoshi SAWADA, Akihiro IMA
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Patent number: 11746880Abstract: A motor reducer of the at least an embodiment of the present invention includes a reduction gear train that decelerates rotation input from a motor, and a reducer casing that accommodates the reduction gear train. An input cover that seals a motor-side end face of the reducer casing is provided, and the input cover is provided separately from the motor casing.Type: GrantFiled: November 22, 2021Date of Patent: September 5, 2023Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Mai Terada, Koji Kiyooka
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Publication number: 20230272851Abstract: [Problem] A power transmission unit that improves quietness of a gear mechanism and prevents a size of the unit from increasing when a brake rotor is installed around an input shaft of the gear mechanism. [Solution] The power transmission unit includes an electric driving motor with a motor shaft, a gear mechanism, and an output shaft, which are accommodated in a transmission housing, wherein the power of the motor shaft is transmitted to the output shaft via the gear mechanism. The gear mechanism has a gear shaft rotatably supported on the transmission housing and a first helical gear provided on the gear shaft. The power transmission unit further includes a connecting member provided with a tubular portion fitted to the motor shaft and the gear shaft so as to allow the motor shaft and the gear shaft to synchronously rotate. The connecting member is integrally provided with a brake rotor on the outer periphery thereof.Type: ApplicationFiled: February 24, 2023Publication date: August 31, 2023Inventors: Koji KIYOOKA, Ryo MOTOOKA, Ken MORISHITA, Hitoshi SAWADA, Akihiro IMA
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Publication number: 20230108197Abstract: A hybrid vehicle includes an engine that drives first wheel, and a motor that drives second wheel. The hybrid vehicle includes (1) a minute speed launch support mode where the hybrid vehicle is driven only by the motor as a drive source, (2) a sudden launch support mode where the hybrid vehicle is driven by the engine and motor as the drive source, and (3) a smooth launch support mode where the hybrid vehicle is driven only by the motor as the drive source in an early stage, is driven by the engine and motor in a middle stage, and is driven only by the engine in a late stage, and if an operation amount of an acceleration instruction unit is not 0 or is substantially not 0, any one of the support modes is executed according to an operation status of the acceleration instruction unit.Type: ApplicationFiled: December 9, 2022Publication date: April 6, 2023Inventors: Fumiaki ITO, Koji KIYOOKA, Tasuku INOUE, Masato ARATA
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Publication number: 20230068720Abstract: A work vehicle includes a main body frame and left and right axle drive devices that drive left and right rear wheels. The axle drive devices include left and right electric motors that are housed and fixed in a motor housing that is fixed to the main body frame and left and right gear mechanisms that are housed in gear housings that are fixed to left and right ends of the motor housing and are connected to the respective electric motors to transmit power. A motor shaft of each of the electric motors rotates the corresponding wheel via the corresponding axle-integrated rotating member including the axle. The motor shaft is also arranged to overlap, along the axial direction, with an inner portion of a circumscribing circle of a maximum outer diameter portion of the corresponding axle-integrated rotating member.Type: ApplicationFiled: August 29, 2022Publication date: March 2, 2023Inventors: Akihiro IMA, Koji KIYOOKA
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Patent number: 11554658Abstract: A hybrid vehicle includes an engine that drives first wheel, and a motor that drives second wheel. The hybrid vehicle includes (1) a minute speed launch support mode where the hybrid vehicle is driven only by the motor as a drive source, (2) a sudden launch support mode where the hybrid vehicle is driven by the engine and motor as the drive source, and (3) a smooth launch support mode where the hybrid vehicle is driven only by the motor as the drive source in an early stage, is driven by the engine and motor in a middle stage, and is driven only by the engine in a late stage, and if an operation amount of an acceleration instruction unit is not 0 or is substantially not 0, any one of the support modes is executed according to an operation status of the acceleration instruction unit.Type: GrantFiled: August 18, 2020Date of Patent: January 17, 2023Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Fumiaki Ito, Koji Kiyooka, Tasuku Inoue, Masato Arata
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Patent number: 11541749Abstract: A moving body drive unit has an electric motor that is located inside the case and has a motor shaft extending in a first direction, a gear shaft that is located, inside the case, parallel to the motor shaft so as to extend in the first direction and has a bevel gear formed thereon, an intermediate gear mechanism that transmits power from the motor shaft to the gear shaft, and a differential gear device that is located inside the case and has a ring gear that meshes with the bevel gear to transmit power from the gear shaft to two output shafts extending in a second direction. The motor shaft and the gear shaft are arranged at different positions in both the second direction and in a third direction that is orthogonal to both the first direction and the second direction.Type: GrantFiled: October 22, 2019Date of Patent: January 3, 2023Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Takashi Nishizawa, Koji Kiyooka, Tasuku Inoue
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Publication number: 20220289355Abstract: In a marine propulsion apparatus that transmits power of at least one of an internal combustion engine (ICE) and a generator motor (GM) mounted on a ship to a propeller via a forward reverse switching mechanism, the marine propulsion apparatus can be downsized as a whole. The marine propulsion apparatus includes a connection switching mechanism capable of selectively connecting the GM to an upstream side and a downstream side of the power transmission from the ICE in the forward reverse switching mechanism. Then, the forward reverse switching mechanism is interposed between the ICE and the connection switching mechanism, and a large torque from the ICE is not directly transmitted to the connection switching mechanism. As a result, it is not necessary to increase the capacity of the connection switching mechanism, and the connection switching mechanism and thus the marine propulsion apparatus can be downsized.Type: ApplicationFiled: July 20, 2020Publication date: September 15, 2022Inventors: Koji KIYOOKA, Tomoyuki EBIHARA, Takashi NISHIZAWA, Koga YAMANE, Kengo SASAHARA, Shigeaki NAKAGAWA, Kazuki YASUI, Toshiaki OKANISHI
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Patent number: 11440401Abstract: A transaxle casing has a fluid sump having a gear top cover, an HST, a reduction gear train and at least one axle disposed in the transaxle casing. The gear top cover accommodates a part of a rotation portion of the reduction gear train. An air supply and exhaust hole is disposed on an upper surface of the gear top cover facing an air sump and is arranged at a position different from a point above a bevel gear. A breather is attached at the air supply and exhaust hole, and a first inner wall extending downward from the upper surface of the upper casing member, is positioned between the part of the bevel gear and the air supply and exhaust hole.Type: GrantFiled: December 7, 2020Date of Patent: September 13, 2022Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Hiroshi Sugimoto, Mai Terada, Koji Kiyooka
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Publication number: 20220272896Abstract: A power transmission unit includes a motor; and a transmission case to enclose an input shaft, an output shaft, and a gear mechanism that transmits driving power between the input shaft and the output shaft. A motor case attached to the transmission case on a side opposite the gear mechanism of the transmission case has a cylindrical shape whose cross section is constant throughout a direction orthogonal to an axial direction of the motor case, and the motor is placed inside the motor case.Type: ApplicationFiled: February 23, 2022Publication date: September 1, 2022Inventors: Koji KIYOOKA, Akihiro IMA, Takashi NISHIZAWA
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Publication number: 20220186826Abstract: A motor reducer of the at least an embodiment of the present invention includes a reduction gear train that decelerates rotation input from a motor, and a reducer casing that accommodates the reduction gear train. An input cover that seals a motor-side end face of the reducer casing is provided, and the input cover is provided separately from the motor casing.Type: ApplicationFiled: November 22, 2021Publication date: June 16, 2022Inventors: Mai TERADA, Koji KIYOOKA
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Publication number: 20220095541Abstract: A transaxle with a brake of the present invention includes the braking device comprising a plurality of brake discs, fixing plates, and a brake operating member, wherein the brake discs have an inner gear tooth portion that can be fitted to an outer gear tooth portion of an output gear of the motor shaft so as not to rotate relative to the outer gear tooth portion and is slidably fixed in the axial direction of the motor shaft, wherein the fixing plates are fixed to the transaxle casing so as not to rotate relative to each other and are slidably fixed in the axial direction of the motor shaft, and wherein the brake operating member provides a predetermined gap between the fixing plates and the brake discs when the brake discs are not pressed.Type: ApplicationFiled: December 9, 2021Publication date: March 31, 2022Inventors: Mai TERADA, Koji KIYOOKA
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Publication number: 20220074476Abstract: A hydrostatic transaxle includes: a casing; a hydraulic continuously variable transmission; and an oil filter that includes a filter body for filtering the hydraulic oil and a filter holding member configured to guide clean oil filtered in the filter body to a suction oil reservoir, in which the filter holding member includes a filter installation portion for installing the filter body, and a suction oil reservoir provided at a position different from the filter installation portion, and the filter installation portion and the suction oil reservoir are configured to be separable from each other and be couplable to each other to freely flow.Type: ApplicationFiled: November 8, 2021Publication date: March 10, 2022Inventors: Takehiro OTA, Michio TSUKAMOTO, Koji KIYOOKA, Mai TERADA, Koji IWAKI
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Patent number: 11207978Abstract: A transaxle with a brake includes an axle supported by the transaxle casing, a continuously variable transmission disposed in the transaxle casing, a braking device that is disposed in the transaxle casing and locks a rotation of the axle, a speed control arm that is journaled so as not to rotate relatively with respect to the transmission operating shaft of the transmission, controls the transmission, and is capable of changing a rotation of the axle continuously. A brake arm that is journaled with respect to an operating shaft of the braking device and a relay arm that is journaled so as to be relatively rotatable with respect to the transmission operating shaft are also included. The relay arm has one end connected to the brake arm via a link mechanism and the other end for lock operation input.Type: GrantFiled: December 14, 2020Date of Patent: December 28, 2021Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Koji Kiyooka, Michio Tsukamoto
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Publication number: 20210316785Abstract: To provide a vehicle including a left continuously variable transmission connected to a left wheel and a right continuously variable transmission connected to a right wheel, at least one operation tool operated to instruct driving of the left wheel and the right wheel, a control device configured to control driving of the left continuously variable transmission and the right continuously variable transmission according to an operation of the at least one operation tool, and a turn operation tool provided on each of the at least one operation tool. If the turn operation tool is operated, the control device controls the left continuously variable transmission and the right continuously variable transmission so that the vehicle is turned to a side of the operated turn operation tool.Type: ApplicationFiled: April 9, 2021Publication date: October 14, 2021Inventors: Kohei OGURA, Koji KIYOOKA, Hidetaka YAMANAMI, Kenji OGATA, Yuya KUROIWA