Patents by Inventor Katsumoto Mizukawa

Katsumoto Mizukawa 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).

  • Patent number: 10895249
    Abstract: A hydraulic transaxle comprises an axial piston hydraulic pump having a variable displacement, and a transaxle casing incorporating the hydraulic pump. The hydraulic pump includes a movable swash plate and a pair of trunnion shafts. The transaxle casing includes a pair of side walls, and includes a pair of casing holes each of which penetrates each of the side walls between an inside and an outside of the transaxle casing. The pair of trunnion shafts are passed through the respective casing holes. The swash plate is formed with a pair of swash plate holes in the respective side portions facing the respective side walls in the inside of the transaxle casing. Proximal end portions of the respective trunnion shafts are inserted into the respective swash plate holes. A distal end portion of one of the trunnion shafts projects from the corresponding casing hole to the outside of the transaxle casing.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: January 19, 2021
    Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventors: Daisuke Murashima, Koji Iwaki, Toshifumi Yasuda, Katsumoto Mizukawa
  • Patent number: 10753448
    Abstract: In a transaxle, the transaxle includes a hydrostatic continuously variable transmission, at least one axle, a gear train for drivingly connecting the hydrostatic continuously variable transmission and the axle, a housing accommodating the hydrostatic continuously variable transmission, the axle, the gear train and storing an oil therein, and a reservoir tank connected to the housing so that the oil in the housing can be moved back and forth. The reservoir tank has a rectangular parallelepiped shape and is disposed on a side of a final reduction bull gear included in the gear train and above the axle along an axis direction of the axle.
    Type: Grant
    Filed: June 5, 2018
    Date of Patent: August 25, 2020
    Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.
    Inventor: Katsumoto Mizukawa
  • Publication number: 20180283517
    Abstract: In a transaxle, the transaxle includes a hydrostatic continuously variable transmission, at least one axle, a gear train for drivingly connecting the hydrostatic continuously variable transmission and the axle, a housing accommodating the hydrostatic continuously variable transmission, the axle, the gear train and storing an oil therein, and a reservoir tank connected to the housing so that the oil in the housing can be moved back and forth. The reservoir tank has a rectangular parallelepiped shape and is disposed on a side of a final reduction bull gear included in the gear train and above the axle along an axis direction of the axle.
    Type: Application
    Filed: June 5, 2018
    Publication date: October 4, 2018
    Inventor: Katsumoto MIZUKAWA
  • Patent number: 10012301
    Abstract: In a differential locking mechanism, a first differential side gear is fixed on a first axle, a second differential side gear is fixed on a second axle, and a bull gear including an engagement part is disposed between the first and second side gears. A cylindrical part is provided on the first differential side gear unrotatably relative to the first differential side gear, and includes a circumferential portion surrounding the first differential side gear. A differential locking slider is fitted on the circumferential portion of the cylindrical part unrotatably relative to the cylindrical part and axially slidably. The differential locking slider is slidable in a direction to engage its engagement part with the engagement part of the bull gear, and in another direction to disengage its engagement part from the engagement part of the bull gear.
    Type: Grant
    Filed: March 28, 2017
    Date of Patent: July 3, 2018
    Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventor: Katsumoto Mizukawa
  • Publication number: 20170284525
    Abstract: In a differential locking mechanism, a first differential side gear is fixed on a first axle, a second differential side gear is fixed on a second axle, and a bull gear including an engagement part is disposed between the first and second side gears. A cylindrical part is provided on the first differential side gear unrotatably relative to the first differential side gear, and includes a circumferential portion surrounding the first differential side gear. A differential locking slider is fitted on the circumferential portion of the cylindrical part unrotatably relative to the cylindrical part and axially slidably. The differential locking slider is slidable in a direction to engage its engagement part with the engagement part of the bull gear, and in another direction to disengage its engagement part from the engagement part of the bull gear.
    Type: Application
    Filed: March 28, 2017
    Publication date: October 5, 2017
    Inventor: Katsumoto MIZUKAWA
  • Publication number: 20170218929
    Abstract: A hydraulic transaxle comprises an axial piston hydraulic pump having a variable displacement, and a transaxle casing incorporating the hydraulic pump. The hydraulic pump includes a movable swash plate and a pair of trunnion shafts. The transaxle casing includes a pair of side walls, and includes a pair of casing holes each of which penetrates each of the side walls between an inside and an outside of the transaxle casing. The pair of trunnion shafts are passed through the respective casing holes. The swash plate is formed with a pair of swash plate holes in the respective side portions facing the respective side walls in the inside of the transaxle casing. Proximal end portions of the respective trunnion shafts are inserted into the respective swash plate holes. A distal end portion of one of the trunnion shafts projects from the corresponding casing hole to the outside of the transaxle casing.
    Type: Application
    Filed: April 13, 2017
    Publication date: August 3, 2017
    Applicant: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventors: Daisuke MURASHIMA, Koji IWAKI, Toshifumi YASUDA, Katsumoto MIZUKAWA
  • Patent number: 9549504
    Abstract: Transaxle systems for a vehicle are disclosed where each of right and left transaxle units includes a hydraulic pump, a hydraulic motor and a casing incorporating the hydraulic pump and motor. Each hydraulic pump has a pump displacement control means operatively connected to a pump control arm pivoted on the casing, and each hydraulic motor has a motor displacement control means operatively connected to a motor control arm pivoted on the casing. A single motor controlling manipulator is operatively connected to the motor control arms to simultaneously shift the motor displacement control means of the right and left transaxle units between large displacement positions and small displacement positions.
    Type: Grant
    Filed: April 10, 2014
    Date of Patent: January 24, 2017
    Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventors: Masaru Iida, Toshifumi Yasuda, Katsumoto Mizukawa, Nobuhiro Shimobayashi
  • Patent number: 9453519
    Abstract: A transaxle includes a hydrostatic transmission and an axle driven by the hydrostatic transmission. The hydrostatic transmission includes a hydraulic pump and a hydraulic motor fluidly connected to each other. The hydraulic pump has a pump shaft. The hydraulic motor has a motor shaft drivingly connected to the axle. The motor shaft has an axis extended slantwise from an axis of the pump shaft. The transaxle further includes a gear train for transmitting power from the motor shaft to the axle, and a gear locking system having a locking pawl. A gear of the gear train is adapted to engage with the locking pawl.
    Type: Grant
    Filed: February 12, 2014
    Date of Patent: September 27, 2016
    Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventors: Oscar H. Saldierna, Toshifumi Yasuda, Koji Iwaki, Katsumoto Mizukawa, Daisuke Murashima, Masaru Iida
  • Patent number: 9420740
    Abstract: 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: Grant
    Filed: August 28, 2013
    Date of Patent: August 23, 2016
    Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.
    Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
  • Publication number: 20160029555
    Abstract: 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: Application
    Filed: September 29, 2015
    Publication date: February 4, 2016
    Inventors: Norihiro ISHII, Kengo SASAHARA, Kazunari KOGA, Jun MATSUURA, Tomoyuki EBIHARA, Katsumoto MIZUKAWA, Hongkun WANG
  • Publication number: 20150075155
    Abstract: An apparatus comprises a hydrostatic transmission and a casing incorporating the hydrostatic transmission. The hydrostatic transmission includes a hydraulic pump, a hydraulic motor and a center section. The hydraulic pump and the hydraulic motor are attached to the center section that is formed therein with a fluid sump fluidly connecting the hydraulic pump to the hydraulic motor. At least a bottom portion of the center section is submerged in a fluid sump in the casing. A charge port for fluidly connecting the fluid sump to the fluid passage is open at the bottom portion of the center section in the fluid sump, The bottom portion of the center section is downwardly convex so as to have an apex at the lowest portion. The opening of the charge port is directed to the apex of the convex bottom portion of the center section.
    Type: Application
    Filed: November 21, 2014
    Publication date: March 19, 2015
    Inventors: Daisuke MURASHIMA, Koji Iwaki, Toshifumi Yasuda, Katsumoto Mizukawa
  • Publication number: 20150007555
    Abstract: A transaxle includes a hydrostatic transmission and an axle driven by the hydrostatic transmission. The hydrostatic transmission includes a hydraulic pump and a hydraulic motor fluidly connected to each other. The hydraulic pump has a pump shaft. The hydraulic motor has a motor shaft drivingly connected to the axle. The motor shaft has an axis extended slantwise from an axis of the pump shaft. The transaxle further includes a gear train for transmitting power from the motor shaft to the axle, and a gear locking system having a locking pawl. A gear of the gear train is adapted to engage with the locking pawl.
    Type: Application
    Filed: February 12, 2014
    Publication date: January 8, 2015
    Applicant: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventors: Oscar H. SALDIERNA, Toshifumi Yasuda, Koji Iwaki, Katsumoto Mizukawa, Daisuke Murashima, Masaru Ilda
  • Publication number: 20140223898
    Abstract: Transaxle systems for a vehicle are disclosed where each of right and left transaxle units includes a hydraulic pump, a hydraulic motor and a casing incorporating the hydraulic pump and motor. Each hydraulic pump has a pump displacement control means operatively connected to a pump control arm pivoted on the casing, and each hydraulic motor has a motor displacement control means operatively connected to a motor control arm pivoted on the casing. A single motor controlling manipulator is operatively connected to the motor control arms to simultaneously shift the motor displacement control means of the right and left transaxle units between large displacement positions and small displacement positions.
    Type: Application
    Filed: April 10, 2014
    Publication date: August 14, 2014
    Inventors: Masaru IIDA, Toshifumi Yasuda, Katsumoto Mizukawa, Nobuhiro Shimobayashi
  • Publication number: 20140059989
    Abstract: 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: Application
    Filed: August 28, 2013
    Publication date: March 6, 2014
    Applicant: Kanzaki Kokyukoki Manufacturing Co., Ltd.
    Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
  • Patent number: 8657041
    Abstract: 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: Grant
    Filed: December 28, 2011
    Date of Patent: February 25, 2014
    Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
  • Patent number: 8544570
    Abstract: 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: Grant
    Filed: January 15, 2008
    Date of Patent: October 1, 2013
    Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
  • Publication number: 20120159916
    Abstract: 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: Application
    Filed: March 8, 2012
    Publication date: June 28, 2012
    Applicant: KANZAKI KOKYUKOKI MANUFACTURING CO., LTD.
    Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa, Hongkun Wang
  • Patent number: 8191342
    Abstract: 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: Grant
    Filed: April 22, 2008
    Date of Patent: June 5, 2012
    Assignee: Kanzaki Kokyukoki Manufacturing Company, Ltd.
    Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
  • Publication number: 20120095636
    Abstract: 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: Application
    Filed: December 28, 2011
    Publication date: April 19, 2012
    Applicant: KANZAKI KOKYUKOKI MANUFACTURING CO., LTD.
    Inventors: Norihiro Ishii, Kengo Sasahara, Kazunari Koga, Jun Matsuura, Tomoyuki Ebihara, Katsumoto Mizukawa
  • Patent number: 7980351
    Abstract: A transaxle (1), having a hydraulic drive unit (20) and a pair of left and right wheel support units (2L and 2R), is suspended from a vehicle frame so as to be turnable around a turning-center axis oriented in a fore-and-aft direction of a vehicle. The hydraulic drive unit (20) comprises: a pair of left and right hydraulic motors (23L and 23R) having respective left and right horizontal motor shafts (23b); a center section (22) formed therein with an oil passage for hydraulically connecting at least one of the hydraulic motors to a hydraulic pump, the center section having motor attachment surfaces onto which the hydraulic motors are attached; and a pair of left and right axle casings (2L and 2R) containing the respective hydraulic motors and supporting the respective motor shafts.
    Type: Grant
    Filed: April 11, 2008
    Date of Patent: July 19, 2011
    Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventors: Koji Iwaki, Norihiro Ishii, Shigenori Sakikawa, Katsumoto Mizukawa, Manabu Kawakami, Kentaro Nagata