Patents by Inventor Kyosei Nakashima
Kyosei Nakashima 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: 11655856Abstract: A motive power transmission device including first and second motive power transmission members that are spline-fitted together includes a spring retaining member that retains a spring and is mounted on the first motive power transmission member. The spring retaining member includes a temporarily fixing portion that is temporarily fixed to and mounted on the first motive power transmission member in a first compression state of the spring and a locking portion that is locked with the second motive power transmission member in a second compression state where when the first and second motive power transmission members are spline-fitted together, the spring is compressed and urges the second motive power transmission member toward one side in a circumferential direction with respect to the first motive power transmission member.Type: GrantFiled: March 19, 2021Date of Patent: May 23, 2023Assignee: Mazda Motor CorporationInventors: Kyosei Nakashima, Hiroyuki Asakura
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Patent number: 11236785Abstract: A power transmission device is provided, which includes a vibration reducing damper provided on a power transmission path, and a clutch mechanism having a plurality of friction plates, a hydraulic pressure chamber, and a centrifugal balance chamber provided opposed to the hydraulic pressure chamber. The clutch mechanism is provided adjacent to an axial side part of the damper, and an oil drain port for hydraulic fluid supplied to the centrifugal balance chamber of the clutch mechanism is provided at a location radially inward of the damper and axially overlapping with the damper.Type: GrantFiled: October 15, 2020Date of Patent: February 1, 2022Assignee: Mazda Motor CorporationInventors: Kyosei Nakashima, Masanori Sasaki, Takayuki Ikemoto
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Publication number: 20210355998Abstract: A motive power transmission device including first and second motive power transmission members that are spline-fitted together includes a spring retaining member that retains a spring and is mounted on the first motive power transmission member. The spring retaining member includes a temporarily fixing portion that is temporarily fixed to and mounted on the first motive power transmission member in a first compression state of the spring and a locking portion that is locked with the second motive power transmission member in a second compression state where when the first and second motive power transmission members are spline-fitted together, the spring is compressed and urges the second motive power transmission member toward one side in a circumferential direction with respect to the first motive power transmission member.Type: ApplicationFiled: March 19, 2021Publication date: November 18, 2021Inventors: Kyosei Nakashima, Hiroyuki Asakura
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Publication number: 20210148416Abstract: A power transmission device is provided, which includes a vibration reducing damper provided on a power transmission path, and a clutch mechanism having a plurality of friction plates, a hydraulic pressure chamber, and a centrifugal balance chamber provided opposed to the hydraulic pressure chamber. The clutch mechanism is provided adjacent to an axial side part of the damper, and an oil drain port for hydraulic fluid supplied to the centrifugal balance chamber of the clutch mechanism is provided at a location radially inward of the damper and axially overlapping with the damper.Type: ApplicationFiled: October 15, 2020Publication date: May 20, 2021Inventors: Kyosei Nakashima, Masanori Sasaki, Takayuki Ikemoto
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Patent number: 10677314Abstract: A power transmission apparatus with a centrifugal pendulum damper is realized, which can effectively suppress torque fluctuation and vibration noise of a vehicle while avoiding size increase of a centrifugal pendulum damper and deterioration of reliability of the centrifugal pendulum damper by high-speed rotation. A power transmission apparatus with a centrifugal pendulum damper includes: a centrifugal pendulum damper coupled to an input shaft through a speed-increasing mechanism configured to increase speed of rotation of the input shaft; and an engagement/disengagement mechanism capable of realizing and cutting off power transmission from the input shaft to the centrifugal pendulum damper.Type: GrantFiled: September 26, 2016Date of Patent: June 9, 2020Assignee: Mazda Motor CorporationInventors: Kyosei Nakashima, Kazuhiro Tanaka, Norio Iwashita, Shinya Kamada, Hiroo Akagi, Tomokazu Kinoshita, Hiroyuki Okayama, Narihito Hongawara, Keiji Bouda
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Patent number: 10240659Abstract: A control device of a powertrain with a centrifugal pendulum damper is provided in which the centrifugal pendulum damper and a power transmission shaft are operatively coupled via a connection/disconnection mechanism, and the control device of the powertrain with the centrifugal pendulum damper includes a connection/disconnection control module for controlling an engagement degree of the connection/disconnection mechanism by controlling the engagement degree of the connection/disconnection mechanism such that the centrifugal pendulum damper rotates at or below a predetermined upper rotational speed limit.Type: GrantFiled: December 2, 2016Date of Patent: March 26, 2019Assignee: Mazda Motor CorporationInventors: Kyosei Nakashima, Yasunari Nakayama, Tadashi Saito, Masaru Nakagishi, Narifumi Domen, Narihito Hongawara
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Publication number: 20180283492Abstract: A power transmission apparatus with a centrifugal pendulum damper is realized, which can effectively suppress torque fluctuation and vibration noise of a vehicle while avoiding size increase of a centrifugal pendulum damper and deterioration of reliability of the centrifugal pendulum damper by high-speed rotation. A power transmission apparatus with a centrifugal pendulum damper includes: a centrifugal pendulum damper coupled to an input shaft through a speed-increasing mechanism configured to increase speed of rotation of the input shaft; and an engagement/disengagement mechanism capable of realizing and cutting off power transmission from the input shaft to the centrifugal pendulum damper.Type: ApplicationFiled: September 26, 2016Publication date: October 4, 2018Inventors: Kyosei Nakashima, Kazuhiro Tanaka, Norio Iwashita, Shinya Kamada, Hiroo Akagi, Tomokazu Kinoshita, Hiroyuki Okayama, Narihito Hongawara, Keiji Bouda
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Patent number: 10081363Abstract: A control apparatus of a powertrain with a centrifugal pendulum absorber, includes an engine formed with a plurality of cylinders, a drive force transmission shaft for receiving an engine output torque, a centrifugal pendulum absorber for reducing a variation in the output torque, a connect-disconnect mechanism, an engine controlling module for shifting an engine operating state between an all-cylinder operation and a reduced-cylinder operation, and a connection controlling module. The connection controlling module shifts a connecting state of the connect-disconnect mechanism to a first state when the engine is in the all-cylinder operation, and shifts the connecting state to a second state in which the connection is tighter than the first state when the engine is in the reduced-cylinder operation. In response to issued requests to shift the engine operating state, the connection controlling module shifts the connecting state, and the engine controlling module shifts the engine operating state.Type: GrantFiled: December 21, 2016Date of Patent: September 25, 2018Assignee: Mazda Motor CorporationInventors: Kyosei Nakashima, Yasunari Nakayama, Tadashi Saito, Masaru Nakagishi, Narifumi Domen, Narihito Hongawara
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Patent number: 9791043Abstract: A control device of a powertrain with a centrifugal pendulum damper is provided comprising a power transmission shaft which transmits power between a drive source and an automatic transmission, and a centrifugal pendulum damper which is coupled to the power transmission shaft and a connection/disconnection mechanism. The automatic transmission has a transmission mechanism of a hydraulic pressure control type, which includes a transmission control module which performs a control to supply transmission hydraulic pressure to the transmission mechanism. The transmission control module includes a transmission characteristic changing module which changes a control characteristic of transmission hydraulic pressure according to an engagement degree of the connection/disconnection mechanism.Type: GrantFiled: December 2, 2016Date of Patent: October 17, 2017Assignee: Mazda Motor CorporationInventors: Kyosei Nakashima, Yasunari Nakayama, Tadashi Saito, Masaru Nakagishi, Narifumi Domen, Narihito Hongawara
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Publication number: 20170190332Abstract: A control apparatus of a powertrain with a centrifugal pendulum absorber, includes an engine formed with a plurality of cylinders, a drive force transmission shaft for receiving an engine output torque, a centrifugal pendulum absorber for reducing a variation in the output torque, a connect-disconnect mechanism, an engine controlling module for shifting an engine operating state between an all-cylinder operation and a reduced-cylinder operation, and a connection controlling module. The connection controlling module shifts a connecting state of the connect-disconnect mechanism to a first state when the engine is in the all-cylinder operation, and shifts the connecting state to a second state in which the connection is tighter than the first state when the engine is in the reduced-cylinder operation. In response to issued requests to shift the engine operating state, the connection controlling module shifts the connecting state, and the engine controlling module shifts the engine operating state.Type: ApplicationFiled: December 21, 2016Publication date: July 6, 2017Inventors: Kyosei Nakashima, Yasunari Nakayama, Tadashi Saito, Masaru Nakagishi, Narifumi Domen, Narihito Hongawara
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Publication number: 20170159747Abstract: A control device of a powertrain with a centrifugal pendulum damper is provided in which the centrifugal pendulum damper and a power transmission shaft are operatively coupled via a connection/disconnection mechanism, and the control device of the powertrain with the centrifugal pendulum damper includes a connection/disconnection control module for controlling an engagement degree of the connection/disconnection mechanism by controlling the engagement degree of the connection/disconnection mechanism such that the centrifugal pendulum damper rotates at or below an predetermined upper rotational speed limit.Type: ApplicationFiled: December 2, 2016Publication date: June 8, 2017Inventors: Kyosei Nakashima, Yasunari Nakayama, Tadashi Saito, Masaru Nakagishi, Narifumi Domen, Narihito Hongawara
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Publication number: 20170159809Abstract: A control device of a powertrain with a centrifugal pendulum damper is provided comprising a power transmission shaft which transmits power between a drive source and an automatic transmission, and a centrifugal pendulum damper which is coupled to the power transmission shaft and a connection/disconnection mechanism. The automatic transmission has a transmission mechanism of a hydraulic pressure control type, which includes a transmission control module which performs a control to supply transmission hydraulic pressure to the transmission mechanism. The transmission control module includes a transmission characteristic changing module which changes a control characteristic of transmission hydraulic pressure according to an engagement degree of the connection/disconnection mechanism.Type: ApplicationFiled: December 2, 2016Publication date: June 8, 2017Inventors: Kyosei Nakashima, Yasunari Nakayama, Tadashi Saito, Masaru Nakagishi, Narifumi Domen, Narihito Hongawara
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Patent number: 9353843Abstract: Automatic transmission 1 includes second friction plates 17 connecting a second drum 27 to a second hub 37, a second engagement hydraulic chamber 67, a second centrifugal balance chamber 77, and a second piston 47 engaging and disengaging the second friction plates 17. The second centrifugal balance chamber 77 overlaps the second friction plates 17 in the axial direction in the automatic transmission 1. The automatic transmission 1 further includes a second oil passage 9 for discharging hydraulic oil in the second centrifugal balance chamber 77 to a position not overlapping the second friction plates 17 in the axial direction.Type: GrantFiled: September 5, 2012Date of Patent: May 31, 2016Assignee: MAZDA MOTOR CORPORATIONInventors: Kyosei Nakashima, Toshihisa Marusue, Kensuke Ueda, Masanori Sasaki, Masamichi Fujikawa
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Publication number: 20140345998Abstract: Automatic transmission 1 includes second friction plates 17 connecting a second drum 27 to a second hub 37, a second engagement hydraulic chamber 67, a second centrifugal balance chamber 77, and a second piston 47 engaging and disengaging the second friction plates 17. The second centrifugal balance chamber 77 overlaps the second friction plates 17 in the axial direction in the automatic transmission 1. The automatic transmission 1 further includes a second oil passage 9 for discharging hydraulic oil in the second centrifugal balance chamber 77 to a position not overlapping the second friction plates 17 in the axial direction.Type: ApplicationFiled: September 5, 2012Publication date: November 27, 2014Applicant: MAZDA MOTOR CORPORATIONInventors: Kyosei Nakashima, Toshihisa Marusue, Kensuke Ueda, Masanori Sasaki, Masamichi Fujikawa