Patents by Inventor Kengo Sasahara
Kengo Sasahara 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: 8899381Abstract: An electric transaxle according to the invention comprises a transaxle casing, an electric motor, an axle, a gear mechanism, first and second fluid sumps, and first and second fluid introduction passages. The transaxle casing defines a gear chamber therein. The electric motor includes a motor casing attached to the transaxle casing. The axle is supported by the transaxle casing. The gear mechanism transmits power from the electric motor to the axle. Fluid of the first fluid sump raised by driving the gear mechanism is supplied to the second fluid sump. The first fluid introduction passage introduces the fluid raised from the first fluid sump to the second fluid sump when the axle is rotated in a forward traveling direction. The second fluid introduction passage introduces the fluid raised from the first fluid sump to the second fluid sump when the axle is rotated in a backward traveling direction.Type: GrantFiled: January 23, 2012Date of Patent: December 2, 2014Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Tomoyuki Ebihara, Hiroaki Hashima, Kengo Sasahara
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Patent number: 8701806Abstract: An electric transaxle unit includes an axle, an electric motor for driving the axle, a motor shaft serving as an output shaft of the electric motor, the motor shaft being not coaxial to the axle, a deceleration gear train interposed between the motor shaft and the axle, a brake adapted to brake any element in a power train between the motor shaft and the axle via the deceleration gear train, and a casing. The casing incorporates the axle, the electric motor, the motor shaft, the deceleration gear train and the brake. The casing includes an attachment portion to be attached to a frame, and wherein the attachment portion has a constant height from a center axis of the axle regardless of whether the casing is vertically inversed.Type: GrantFiled: December 9, 2009Date of Patent: April 22, 2014Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Norihiro Ishii, Tomoyuki Ebihara, Kengo Sasahara, Masaya Itou
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Publication number: 20140059989Abstract: A riding lawnmower includes left and right wheels, at least one caster wheel, a lawnmower blade or reel, and a control section. The left and right wheels are independently driven by electric rotary machines to travel. The lawnmower blade or reel is driven for mowing. The control section, in response to turn instruction input by a turn operator, controls the left and right wheels according to preset standard setting conditions, or according to deceleration setting conditions which differ from the standard setting conditions, under which at least one of a vehicle movement speed and vehicle turning speed is decelerated more than under standard setting conditions. The riding lawnmower includes a section designating either standard setting conditions or deceleration setting conditions. In a riding lawnmower, left and right wheels are caused to turn around a turn center position corresponding to a turn instruction according to designated setting conditions.Type: ApplicationFiled: August 28, 2013Publication date: March 6, 2014Applicant: Kanzaki Kokyukoki Manufacturing Co., Ltd.Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
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Patent number: 8662600Abstract: A lawnmower vehicle which is a working vehicle with an electromagnetic brake includes left and right electromagnetic brakes, a brake relay which is a common brake releasing unit, and an ECU. The ECU compares electricity supply states of the left and right electromagnetic brakes, and controls the brake relay to disconnect an electrical connection between a battery and the left and right electromagnetic brakes, and to brake left and right wheels when a difference in the electricity supply states compared by a comparator exceeds an allowable upper limit.Type: GrantFiled: July 10, 2012Date of Patent: March 4, 2014Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Kazunari Koga, Hongkun Wang, Jun Matsuura, Kengo Sasahara, Fumitoshi Ishino
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Patent number: 8657041Abstract: A control system for a lawnmower vehicle having a plurality of electric motors may include at least one controller for controlling operation of the drive wheel electric motor in response to an operation amount of at least one operator. The controller may control operation of a driver for driving a mower-related electric motor to cause the mower-related electric motor to activate or stop.Type: GrantFiled: December 28, 2011Date of Patent: February 25, 2014Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
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Patent number: 8579055Abstract: An electric zero-turn working vehicle comprises a vehicle body frame, right and left drive wheels, right and left first electric motors for driving the respective right and left drive wheels, a transaxle including at least one of the right and left first electric motors, a working implement, and a second electric motor for driving the working implement. The right and left first electric motors have a space therebetween. The transaxle is supported by the vehicle body frame and is disposed below the vehicle body frame. At least a part of the second electric motor is disposed in the space between the right and left first electric motors.Type: GrantFiled: April 8, 2011Date of Patent: November 12, 2013Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Kengo Sasahara, Kazunari Koga, Masaya Itou
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Patent number: 8544570Abstract: A riding lawnmower includes left and right wheels, at least one caster wheel, a lawnmower blade or reel, and a control section. The left and right wheels are independently driven by electric rotary machines to travel. The lawnmower blade or reel is driven for mowing. The control section, in response to turn instruction input by a turn operator, controls the left and right wheels according to preset standard setting conditions, or according to deceleration setting conditions which differ from the standard setting conditions, under which at least one of a vehicle movement speed and vehicle turning speed is decelerated more than under standard setting conditions. The riding lawnmower includes a section designating either standard setting conditions or deceleration setting conditions. In a riding lawnmower, left and right wheels are caused to turn around a turn center position corresponding to a turn instruction according to designated setting conditions.Type: GrantFiled: January 15, 2008Date of Patent: October 1, 2013Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
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Patent number: 8511216Abstract: A hydraulic actuator unit includes a first electric motor assembly formed by mounting one of a pair of electric motors to one of a pair of electric motor covers, wherein the first electric motor assembly is detachably mounted to a pump case so as to rotate a first control shaft around its axis line, and a second electric motor assembly formed by mounting the other one of the pair of electric motors to the other one of the pair of electric motor covers, wherein the second electric motor assembly is detachably mounted to the pump case so as to rotate a second control shaft around its axis line.Type: GrantFiled: March 26, 2010Date of Patent: August 20, 2013Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Kengo Sasahara, Toshifumi Yasuda, Minoru Kamada, Masaaki Inoue, Takashi Nishizawa, Fumitoshi Ishino, Masaya Itou, Shinichi Hirose, Jun Matsuura, Ryota Iwaibara
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Patent number: 8381853Abstract: An electric vehicle comprising a drive wheel which is driven by a traction electric motor, a brake command device, a brake releasing unit, a brake shaft, a friction plate, and a braking spring. The brake shaft is rotatable in a brake realizing direction which is one direction by an operation of the brake command device, and is rotatable in a brake releasing direction which is the other direction by driving of the brake releasing unit. The friction plate is operatively connected to the traction electric motor, and is frictionally braked when the brake shaft is rotated in the brake realizing direction. The braking spring applies an elastic force to the brake shaft in a direction to rotate the brake shaft in the brake realizing direction.Type: GrantFiled: December 17, 2010Date of Patent: February 26, 2013Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Koji Iwaki, Kazunari Koga, Kengo Sasahara
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Publication number: 20130019707Abstract: An electric transaxle according to the invention comprises a transaxle casing, an electric motor, an axle, a gear mechanism, first and second fluid sumps, and first and second fluid introduction passages. The transaxle casing defines a gear chamber therein. The electric motor includes a motor casing attached to the transaxle casing. The axle is supported by the transaxle casing. The gear mechanism transmits power from the electric motor to the axle. Fluid of the first fluid sump raised by driving the gear mechanism is supplied to the second fluid sump. The first fluid introduction passage introduces the fluid raised from the first fluid sump to the second fluid sump when the axle is rotated in a forward traveling direction. The second fluid introduction passage introduces the fluid raised from the first fluid sump to the second fluid sump when the axle is rotated in a backward traveling direction.Type: ApplicationFiled: January 23, 2012Publication date: January 24, 2013Inventors: Tomoyuki Ebihara, Hiroaki Hashima, Kengo Sasahara
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Publication number: 20130015005Abstract: A lawnmower vehicle which is a working vehicle with an electromagnetic brake includes left and right electromagnetic brakes, a brake relay which is a common brake releasing unit, and an ECU. The ECU compares electricity supply states of the left and right electromagnetic brakes, and controls the brake relay to disconnect an electrical connection between a battery and the left and right electromagnetic brakes, and to brake left and right wheels when a difference in the electricity supply states compared by a comparator exceeds an allowable upper limit.Type: ApplicationFiled: July 10, 2012Publication date: January 17, 2013Applicant: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Kazunari KOGA, Hongkun WANG, Jun MATSUURA, Kengo SASAHARA, Fumitoshi ISHINO
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Patent number: 8267205Abstract: A riding work vehicle includes right and left wheels, at least one caster wheel, and a working machine. The lawnmower vehicle further includes traveling motor, steering motor, a traveling system clutch, and a steering system clutch. The traveling system clutch is configured to disable transmission of the rotational force from an axle of the caster wheel to the traveling motor in a state where the traveling motor is deactivated. The steering system clutch is configured to disable transmission of the rotational force from a steering shaft for the caster wheel to the steering motor in a state where the steering motor is deactivated.Type: GrantFiled: February 12, 2010Date of Patent: September 18, 2012Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Norihiro Ishii, Tomoyuki Ebihara, Kengo Sasahara
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Patent number: 8240414Abstract: An electric lawn mower includes a main frame, a mower deck supported by the main frame, a castor supported by the main frame, a sub frame, a pair of transaxles, and a pair of motor drivers. Each of the transaxles includes a transaxle housing, an electric motor disposed in the transaxle housing, a single axle supported by the transaxle housing, and a drive wheel fixed on the axle outside of the transaxle housing. The motor drivers supply electric power to the respective motors of the respective transaxles. The sub frame, supporting the transaxles and the motor drivers, is connected to the main frame.Type: GrantFiled: May 23, 2011Date of Patent: August 14, 2012Assignees: Yanmar Co., Ltd., Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Kengo Sasahara, Tomoyuki Ebihara, Mitsuhiro Nakagaki, Kazuma Moriguchi, Keiji Matsumoto
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Publication number: 20120159916Abstract: A control system for an engineless, motor-driven lawnmower vehicle includes electric motors and controllers. At least one of the electric motors is an electric drive motor connected to a drive wheel of the lawnmower vehicle to enable transmission of motive power. At least one other electric motor is a mower-related electric motor connected to a lawnmower rotary tool to enable transmission of motive power. At least one of the controllers is a drive wheel controller which includes a drive wheel driver and which controls operation of the electric drive motor in response to a signal from at least one operator sensor for detecting an operation amount of at least one operator. At least one controller controls to activate or stop the mower-related electric motor. At least one controller is connected to the drive wheel controller and transmits a control signal thereto in response to a signal from the operator sensor.Type: ApplicationFiled: March 8, 2012Publication date: June 28, 2012Applicant: KANZAKI KOKYUKOKI MANUFACTURING CO., LTD.Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa, Hongkun Wang
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Patent number: 8191342Abstract: A riding lawnmower vehicle includes two main drive wheels, at least one caster wheel, an electric traction motor, an internal combustion engine, a generator driven by the internal combustion engine, and a lawnmower. The electric energy generated by the generator can be supplied directly or via an electric accumulator to the electric traction motor. The main drive wheels are independently driven by the electric traction motor, which can operate as a traction power source. When viewed from one end to the other end in the width direction of the vehicle, the internal combustion engine and a secondary battery operable as the electric accumulator overlap each other, and the main drive wheels overlap at least a part of at least one of the internal combustion engine, the generator, the secondary battery, a fuel cell, a capacitor, an inverter, a cooling device, a mower driving motor, and a grass-collecting duct.Type: GrantFiled: April 22, 2008Date of Patent: June 5, 2012Assignee: Kanzaki Kokyukoki Manufacturing Company, Ltd.Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
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Publication number: 20120095636Abstract: A control system for a lawnmower vehicle having a plurality of electric motors may include at least one controller for controlling operation of the drive wheel electric motor in response to an operation amount of at least one operator. The controller may control operation of a driver for driving a mower-related electric motor to cause the mower-related electric motor to activate or stop.Type: ApplicationFiled: December 28, 2011Publication date: April 19, 2012Applicant: KANZAKI KOKYUKOKI MANUFACTURING CO., LTD.Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
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Patent number: 8105203Abstract: A dual clutch transmission comprises a first clutch to be engaged for setting any one of forward-traveling odd-numbered speeds and a second clutch to be engaged for setting any one of forward-traveling even-numbered speeds. The dual clutch transmission establishes a desired forward-traveling speed by alternately engaging/disengaging the first and second clutches. A backward-traveling drive train is adapted to be driven by engaging one of the first and second clutches. When a reverse mode is established by a mode setting means, the one of the first and second clutches is engaged to drive the backward-traveling drive train by setting a speed change manipulator at a backward-traveling position, and the other of the first and second clutches is engaged to drive a fixed one forward-traveling speed drive train by setting the speed change manipulator at a forward-traveling position.Type: GrantFiled: August 13, 2008Date of Patent: January 31, 2012Assignee: Kanzaki Kokyakoki Mfg. Co., Ltd.Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Tomoyuki Ebihara
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Publication number: 20110289896Abstract: An electric lawn mower includes a main frame, a mower deck supported by the main frame, a castor supported by the main frame, a sub frame, a pair of transaxles, and a pair of motor drivers. Each of the transaxles includes a transaxle housing, an electric motor disposed in the transaxle housing, a single axle supported by the transaxle housing, and a drive wheel fixed on the axle outside of the transaxle housing. The motor drivers supply electric power to the respective motors of the respective transaxles. The sub frame, supporting the transaxles and the motor drivers, is connected to the main frame.Type: ApplicationFiled: May 23, 2011Publication date: December 1, 2011Inventors: Kengo SASAHARA, Tomoyuki EBIHARA, Mitsuhiro NAKAGAKI, Kazuma MORIGUCHI, Keiji MATSUMOTO
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Publication number: 20110247886Abstract: An electric zero-turn working vehicle comprises a vehicle body frame, right and left drive wheels, right and left first electric motors for driving the respective right and left drive wheels, a transaxle including at least one of the right and left first electric motors, a working implement, and a second electric motor for driving the working implement. The right and left first electric motors have a space therebetween. The transaxle is supported by the vehicle body frame and is disposed below the vehicle body frame. At least a part of the second electric motor is disposed in the space between the right and left first electric motors.Type: ApplicationFiled: April 8, 2011Publication date: October 13, 2011Inventors: Kengo SASAHARA, Kazunari Koga, Masaya Itou
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Patent number: 7975786Abstract: There is provided an electric ground working vehicle including a left wheel and a right wheel, at least one caster, a working apparatus, an acceleration operating element for performing acceleration instructions, a turn operating element for performing turn instructions, and a control unit. The left wheel and the right wheel are independently driven by left and right electric motors respectively. The control unit controls a regenerative brake driving unit so that electric power is regenerated from the left and right electric motors to an electric power source unit when the acceleration operating element is not operated during traveling to regeneratively brake the left and right wheels.Type: GrantFiled: April 17, 2009Date of Patent: July 12, 2011Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Norihiro Ishii, Kengo Sasahara, Tomoyuki Ebihara, Kazunari Koga