Patents by Inventor Kazuhiro Owada
Kazuhiro Owada 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: 11933391Abstract: An HST of the present invention includes a main plate and a sub-plate supporting a center section, a pump-side swash plate holder and a motor-side swash plate holder by their inner surfaces facing each other. The main plate is provided with an extended region that extends farther outward in a planar direction of the main plate than an installation space of the center section, the pump-side swash plate holder and the motor-side swash plate holder and than the sub-plate as viewed along a direction in which the main plate and the sub-plate face each other.Type: GrantFiled: June 4, 2020Date of Patent: March 19, 2024Assignee: Kanzaki Kokyukoki Mfg. Co., LTD.Inventors: Kazuhiro Owada, Koji Iwaki, Kengo Sasahara
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Patent number: 11841067Abstract: A transmission structure of the present invention changes capacity of pump body so that vehicle speed detected by vehicle speed sensor increases and reduces according to speed-increasing and speed-reducing operations of speed-change operating member while fixing capacity of motor body at a low-speed motor capacity when the vehicle speed is equal to or lower than a switching speed that is realized by setting motor body to the low-speed motor capacity and setting the pump body to a predetermined pump switching capacity, and changes capacity of motor body so that vehicle speed increases and reduces in accordance with speed-increasing and speed-reducing operations of speed-change operating member while fixing capacity of the pump body at the pump switching capacity when vehicle speed is higher than the switching speed.Type: GrantFiled: August 6, 2020Date of Patent: December 12, 2023Assignee: Kanzaki Kokyukoki Mfg. Co., LTDInventors: Kazuhiro Owada, Koji Iwaki
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Publication number: 20230383828Abstract: In a transmission structure according to this invention, speed change ratios of input side first and second transmission mechanisms are set so that the rotational speed of a planetary second element is the same when an HST output is set to a second HST speed in either a first transmission state or a second transmission state, and the rotational speed of a planetary first element is the same when the HST output is set to the second HST speed in either the second transmission state or the first transmission state. The speed change ratios of an output side first and second transmission mechanisms are set so that the rotational speed developed in a speed change output shaft when the HST output is set to the second HST speed is the same in either the first or second transmission states.Type: ApplicationFiled: August 9, 2023Publication date: November 30, 2023Inventors: Koji IWAKI, Kazuhiro OWADA, Kengo SASAHARA
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Patent number: 11767904Abstract: In a transmission structure according to this invention, speed change ratios of input side first and second transmission mechanisms are set so that the rotational speed of a planetary second element is the same when an HST output is set to a second HST speed in either a first transmission state or a second transmission state, and the rotational speed of a planetary first element is the same when the HST output is set to the second HST speed in either the second transmission state or the first transmission state. The speed change ratios of an output side first and second transmission mechanisms are set so that the rotational speed developed in a speed change output shaft when the HST output is set to the second HST speed is the same in either the first or second transmission states.Type: GrantFiled: January 13, 2023Date of Patent: September 26, 2023Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Koji Iwaki, Kazuhiro Owada, Kengo Sasahara
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Publication number: 20230220910Abstract: A transmission structure of the present invention changes capacity of pump body so that vehicle speed detected by vehicle speed sensor increases and reduces according to speed-increasing and speed-reducing operations of speed-change operating member while fixing capacity of motor body at a low-speed motor capacity when the vehicle speed is equal to or lower than a switching speed that is realized by setting motor body to the low-speed motor capacity and setting the pump body to a predetermined pump switching capacity, and changes capacity of motor body so that vehicle speed increases and reduces in accordance with speed-increasing and speed-reducing operations of speed-change operating member while fixing capacity of the pump body at the pump switching capacity when vehicle speed is higher than the switching speed.Type: ApplicationFiled: August 6, 2020Publication date: July 13, 2023Inventors: Kazuhiro OWADA, Koji IWAKI
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Patent number: 11668381Abstract: A transmission structure of the present invention causes, during a period from a time point when a rotational speed of a drive rotational power reaches a predetermined first/second speed stage shift-up start speed until a first/second speed stage shift-up end time point, one of an input-side clutch mechanism pair and an output-side clutch mechanism pair to be in a double transmitting state, and causes, in the double transmitting state, a first clutch mechanism and a second clutch mechanism of the other one of the input-side clutch mechanism pair and the output-side clutch mechanism pair to be shifted to a disengagement sate and an engagement state, respectively, while having frictional plate slid.Type: GrantFiled: July 18, 2022Date of Patent: June 6, 2023Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Kazuhiro Owada, Koji Iwaki, Ryo Motooka, Kohei Ogura, Takumi Takahashi
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Publication number: 20230160460Abstract: In a transmission structure according to this invention, speed change ratios of input side first and second transmission mechanisms are set so that the rotational speed of a planetary second element is the same when an HST output is set to a second HST speed in either a first transmission state or a second transmission state, and the rotational speed of a planetary first element is the same when the HST output is set to the second HST speed in either the second transmission state or the first transmission state. The speed change ratios of an output side first and second transmission mechanisms are set so that the rotational speed developed in a speed change output shaft when the HST output is set to the second HST speed is the same in either the first or second transmission states.Type: ApplicationFiled: January 13, 2023Publication date: May 25, 2023Inventors: Koji IWAKI, Kazuhiro OWADA, Kengo SASAHARA
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Patent number: 11572939Abstract: In a transmission structure according to this invention, speed change ratios of input side first and second transmission mechanisms are set so that the rotational speed of a planetary second element is the same when an HST output is set to a second HST speed in either a first transmission state or a second transmission state, and the rotational speed of a planetary first element is the same when the HST output is set to the second HST speed in either the second transmission state or the first transmission state. The speed change ratios of an output side first and second transmission mechanisms are set so that the rotational speed developed in a speed change output shaft when the HST output is set to the second HST speed is the same in either the first or second transmission states.Type: GrantFiled: November 15, 2021Date of Patent: February 7, 2023Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Koji Iwaki, Kazuhiro Owada, Kengo Sasahara
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Publication number: 20230014393Abstract: A transmission structure of the present invention causes, during a period from a time point when a rotational speed of a drive rotational power reaches a predetermined first/second speed stage shift-up start speed until a first/second speed stage shift-up end time point, one of an input-side clutch mechanism pair and an output-side clutch mechanism pair to be in a double transmitting state, and causes, in the double transmitting state, a first clutch mechanism and a second clutch mechanism of the other one of the input-side clutch mechanism pair and the output-side clutch mechanism pair to be shifted to a disengagement sate and an engagement state, respectively, while having frictional plate slid.Type: ApplicationFiled: July 18, 2022Publication date: January 19, 2023Inventors: Kazuhiro OWADA, Koji IWAKI, Ryo MOTOOKA, Kohei OGURA, Takumi TAKAHASHI
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Publication number: 20220307578Abstract: An HST of the present invention includes a main plate and a sub-plate supporting a center section, a pump-side swash plate holder and a motor-side swash plate holder by their inner surfaces facing each other. The main plate is provided with an extended region that extends farther outward in a planar direction of the main plate than an installation space of the center section, the pump-side swash plate holder and the motor-side swash plate holder and than the sub-plate as viewed along a direction in which the main plate and the sub-plate face each other.Type: ApplicationFiled: June 4, 2020Publication date: September 29, 2022Inventors: Kazuhiro OWADA, Koji IWAKI, Kengo SASAHARA
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Patent number: 11293528Abstract: A working vehicle of this invention includes a main speed change structure that includes a continuously variable speed change structure such as an HMT structure and a multi-speed speed change structure capable of switching between a first power transmission state with a first gear ratio and a second power transmission state with a second gear ratio providing a higher speed than the first gear ratio. A control device causes the continuously variable speed change structure to be accelerated to a forward travel side in accordance with an accelerating operation of a speed change operation member in a forward travel direction, and causes the multi-speed speed change structure to be changed from a first power transmission state to a second power transmission state when the rotational speed of the speed change output shaft reaches a switching speed set to exceed a work speed range.Type: GrantFiled: October 29, 2019Date of Patent: April 5, 2022Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Koji Iwaki, Kazuhiro Owada, Kengo Sasahara
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Publication number: 20220074491Abstract: In a transmission structure according to this invention, speed change ratios of input side first and second transmission mechanisms are set so that the rotational speed of a planetary second element is the same when an HST output is set to a second HST speed in either a first transmission state or a second transmission state, and the rotational speed of a planetary first element is the same when the HST output is set to the second HST speed in either the second transmission state or the first transmission state. The speed change ratios of an output side first and second transmission mechanisms are set so that the rotational speed developed in a speed change output shaft when the HST output is set to the second HST speed is the same in either the first or second transmission states.Type: ApplicationFiled: November 15, 2021Publication date: March 10, 2022Inventors: Koji IWAKI, Kazuhiro OWADA, Kengo SASAHARA
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Patent number: 11204097Abstract: In a transmission structure according to this invention, speed change ratios of input side first and second transmission mechanisms are set so that the rotational speed of a planetary second element is the same when an HST output is set to a second HST speed in either a first transmission state or a second transmission state, and the rotational speed of a planetary first element is the same when the HST output is set to the second HST speed in either the second transmission state or the first transmission state. The speed change ratios of an output side first and second transmission mechanisms are set so that the rotational speed developed in a speed change output shaft when the HST output is set to the second HST speed is the same in either the first or second transmission states.Type: GrantFiled: October 16, 2019Date of Patent: December 21, 2021Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Koji Iwaki, Kazuhiro Owada, Kengo Sasahara
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Publication number: 20200132169Abstract: A working vehicle of this invention includes a main speed change structure that includes a continuously variable speed change structure such as an HMT structure and a multi-speed speed change structure capable of switching between a first power transmission state with a first gear ratio and a second power transmission state with a second gear ratio providing a higher speed than the first gear ratio. A control device causes the continuously variable speed change structure to be accelerated to a forward travel side in accordance with an accelerating operation of a speed change operation member in a forward travel direction, and causes the multi-speed speed change structure to be changed from a first power transmission state to a second power transmission state when the rotational speed of the speed change output shaft reaches a switching speed set to exceed a work speed range.Type: ApplicationFiled: October 29, 2019Publication date: April 30, 2020Inventors: Koji IWAKI, Kazuhiro OWADA, Kengo SASAHARA
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Publication number: 20200124170Abstract: In a transmission structure according to this invention, speed change ratios of input side first and second transmission mechanisms are set so that the rotational speed of a planetary second element is the same when an HST output is set to a second HST speed in either a first transmission state or a second transmission state, and the rotational speed of a planetary first element is the same when the HST output is set to the second HST speed in either the second transmission state or the first transmission state. The speed change ratios of an output side first and second transmission mechanisms are set so that the rotational speed developed in a speed change output shaft when the HST output is set to the second HST speed is the same in either the first or second transmission states.Type: ApplicationFiled: October 16, 2019Publication date: April 23, 2020Inventors: Koji IWAKI, Kazuhiro OWADA, Kengo SASAHARA
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Patent number: 10519990Abstract: The hydraulic apparatus is set so that the ratio of the pressure-receiving area of the respective bottom oil chambers of the boom cylinder, the arm cylinder and the bucket cylinder to the pressure-receiving area of the respective rod oil chambers matches the ratio of the extruded volume drawn into or discharged from the bottom oil chambers per single rotation by the respective extrusion members of the first hydraulic pump motor, the second hydraulic pump motor and the third hydraulic pump motor to the volume discharged from or drawn into the rod oil chambers.Type: GrantFiled: March 26, 2015Date of Patent: December 31, 2019Assignee: YANMAR CO., LTD.Inventors: Kazuhiro Owada, Keishi Yamanaka, Kensuke Kaneda, Hidekazu Niu
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Publication number: 20170198730Abstract: The hydraulic apparatus is set so that the ratio of the pressure-receiving area of the respective bottom oil chambers of the boom cylinder, the arm cylinder and the bucket cylinder to the pressure-receiving area of the respective rod oil chambers matches the ratio of the extruded volume drawn into or discharged from the bottom oil chambers per single rotation by the respective extrusion members of the first hydraulic pump motor, the second hydraulic pump motor and the third hydraulic pump motor to the volume discharged from or drawn into the rod oil chambers.Type: ApplicationFiled: March 26, 2015Publication date: July 13, 2017Inventors: Kazuhiro OWADA, Keishi YAMANAKA, Kensuke KANEDA, Hidekazu NIU
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Publication number: 20120097022Abstract: A pump unit includes a variable capacity pump, and a balanced piston mechanism having a piston body, connected to an operation section of a variable swash plate, provided inside a cylinder, capable of sliding in an axial direction. The balanced piston mechanism has first, second and third pressure receiving chambers provided in the cylinder. Primary side and the secondary side working fluid pressures of an actuator switching valve are respectively introduced to the first receive pressure chamber and the second pressure receiving chamber, and a set pressure that has been previously set, corresponding to a working fluid differential pressure arising before and after passing through the actuator switching valve, in a steady state of the operating position of the actuator switching valve is introduced to the third pressure receiving chamber.Type: ApplicationFiled: October 24, 2011Publication date: April 26, 2012Applicants: YANMAR CO., LTD., KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Kazuhiro OWADA, Hideki KANENOBU, Koji SAKATA, Takeshi OKAZAKI
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Publication number: 20120097460Abstract: A hydraulically powered working vehicle includes a turning section provided at an upper side of a travel unit capable of turning, and hydraulic circuits for the working vehicle. The hydraulic circuit for the working vehicle has a first actuator group including a one side traveling motor, a first variable capacity pump for driving the first actuator group, a second actuator group including an other side traveling motor and a turning motor, and a second variable capacity pump for driving the second actuator group. The second variable capacity pump is set so that a maximum value for discharge capacity per unit time becomes large compared to that of the first variable capacity pump.Type: ApplicationFiled: October 24, 2011Publication date: April 26, 2012Applicants: YANMAR CO., LTD., KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Kazuhiro OWADA, Hideki KANENOBU, Koji SAKATA, Takeshi OKAZAKI
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Patent number: 7523609Abstract: There is provided a hydrostatic transmission (HST) in which a hydraulic pump unit operatively driven by a driving power source and a hydraulic motor unit arranged spaced apart from the hydraulic pump unit and operatively driving a driving-wheel are fluidly connected by way of operation fluid lines so as to form a closed circuit. The hydraulic motor unit is provided with motor-side operation fluid passages forming one part of the operation fluid lines. A motor-side charge fluid passage having a first end opened to an outside to form a motor-side charge port and a second end fluidly connected to at least one of the motor-side operation fluid passages is also included. A check valve is interposed in the motor-side charge fluid passage so as to allow the fluid to flow from the motor-side charge port to one motor-side operation fluid passage while preventing reverse flow.Type: GrantFiled: January 24, 2007Date of Patent: April 28, 2009Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Yasuhisa Mochizuki, Koji Sakata, Kazuhiro Owada