Patents by Inventor Isamu Aoki

Isamu Aoki 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).

  • Publication number: 20210270016
    Abstract: Provided is a work machine capable of notifying that maintenance is necessary due to continuation of clogging in a cooling device or decrease in cooling performance. A wheel loader 1 including a radiator 31 and an oil cooler 32 comprises a controller 5, 5A configured to determine a clogging continuation state of the radiator 31 or the oil cooler 32. The controller 5, 5A determines whether clogging is occurring in the radiator 31 or the oil cooler 32 based on outside air temperature AW and cooling water temperature CW or hydraulic oil temperature HW, determines whether the clogging continues based on a clogging occurrence ratio R1, R2 while an engine 30 is operating, and outputs a notification command signal for providing the alarm buzzer 61 and the user management system 62 with a command to notify that maintenance is necessary when it is determined that the clogging continues.
    Type: Application
    Filed: December 25, 2019
    Publication date: September 2, 2021
    Inventors: Koji HYODO, Masaki YOSHIKAWA, Kazuyuki ITO, Tetsuji TANAKA, Kouji SHIMAZAKI, Isamu AOKI
  • Patent number: 10947701
    Abstract: Provided is a working vehicle capable of, while reducing fuel consumption, improving traveling performance only when high traveling performance is required. A wheel loader 1 comprises: an engine 3; a variable displacement HST pump 41; a variable displacement HST motor 42 connected to the HST pump 41 through a closed circuit; pressure sensors 72A, 72B configured to load pressure of the HST motor 42; and a controller 5, wherein the controller 5 is configured to, in a case of determining that a load pressure detection value P is included in a predetermined pressure range of greater than load pressure P? corresponding to flat ground traveling and smaller than load pressure P? corresponding to an excavation operation, increase maximum rotational speed of the engine 3 only within the predetermined pressure range.
    Type: Grant
    Filed: September 24, 2019
    Date of Patent: March 16, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Koji Hyodo, Tetsuji Tanaka, Isamu Aoki, Masaki Nukii, Yuki Ahiko
  • Publication number: 20210047801
    Abstract: Provided is a working vehicle capable of increasing lifting operation speed of a working device without increasing cost, even when provided with a circuit configuration that prioritizes a steering operation over a working device operation. A wheel loader 1 comprises a priority valve 451 configured to allow hydraulic oil discharged from a hydraulic pump 41 to flow into a steering drive circuit 43 preferentially over a working device drive circuit 44, and further comprises: an electric steering lever 30; a pair of solenoid control valves 34A, 34B configured to control a steering directional control valve 33; and a controller 5. The controller 5 is configured to control the pair of solenoid control valves 34A, 34B so as to limit operation speed of a steering 3 when determining that an engine 40 is in a low idle state and a lift arm 21 is performing a lifting operation.
    Type: Application
    Filed: September 24, 2019
    Publication date: February 18, 2021
    Inventors: Tetsuji TANAKA, Koji HYODO, Yasunori MIYAMOTO, Isamu AOKI
  • Patent number: 10895062
    Abstract: Provide is a loading vehicle capable of quickly operating an object handling device in the upward direction while traveling forward. A wheel loader 1 comprises an engine 3, an HST pump 41, an HST motor 42, a forward/reverse changeover switch 62, a step-on amount sensor 610, a pressure sensor 73, and a controller 5. In a case where a specific condition for specifying lifting operation of a lift arm 21 during forward traveling of the vehicle body is satisfied, the controller 5 increases maximum rotational speed of the engine to a predetermined value Nmax2 which is greater than maximum engine rotational speed Nmax1 during traveling on the flat ground, and limit maximum vehicle speed to a predetermined value Vmax2 which is smaller than maximum vehicle speed Vmax1 prior to the lifting operation of the lift arm 2.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: January 19, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Koji Hyodo, Yuki Ahiko, Tetsuji Tanaka, Isamu Aoki, Masaki Nukii, Masashi Yamashita
  • Publication number: 20210002865
    Abstract: Provided is a working vehicle capable of, while reducing fuel consumption, improving traveling performance only when high traveling performance is required. A wheel loader 1 comprises: an engine 3; a variable displacement HST pump 41; a variable displacement HST motor 42 connected to the HST pump 41 through a closed circuit; pressure sensors 72A, 72B configured to load pressure of the HST motor 42; and a controller 5, wherein the controller 5 is configured to, in a case of determining that a load pressure detection value P is included in a predetermined pressure range of greater than load pressure Pa corresponding to flat ground traveling and smaller than load pressure P? corresponding to an excavation operation, increase maximum rotational speed of the engine 3 only within the predetermined pressure range.
    Type: Application
    Filed: September 24, 2019
    Publication date: January 7, 2021
    Inventors: Koji HYODO, Tetsuji TANAKA, Isamu AOKI, Masaki NUKII, Yuki AHIKO
  • Publication number: 20200378089
    Abstract: Provide is a loading vehicle capable of quickly operating an object handling device in the upward direction while traveling forward. A wheel loader 1 comprises an engine 3, an HST pump 41, an HST motor 42, a forward/reverse changeover switch 62, a step-on amount sensor 610, a pressure sensor 73, and a controller 5. In a case where a specific condition for specifying lifting operation of a lift arm 21 during forward traveling of the vehicle body is satisfied, the controller 5 increases maximum rotational speed of the engine to a predetermined value Nmax2 which is greater than maximum engine rotational speed Nmax1 during traveling on the flat ground, and limit maximum vehicle speed to a predetermined value Vmax2 which is smaller than maximum vehicle speed Vmax1 prior to the lifting operation of the lift arm 2.
    Type: Application
    Filed: September 28, 2018
    Publication date: December 3, 2020
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Koji HYODO, Yuki AHIKO, Tetsuji TANAKA, Isamu AOKI, Masaki NUKII, Masashi YAMASHITA
  • Publication number: 20200362540
    Abstract: A work vehicle is provided. The work vehicle is capable of notifying an operator of a state close to overheating of a temperature of a cooling oil that cools a brake device before the temperature overheats. A controller (10) in a work vehicle (100) compares each detection value detected from a brake pressure sensor (26) and a vehicle speed sensor (15) to each threshold (V1, P1, R1) predetermined corresponding to each sensor. The controller (10) outputs a warning command that a temperature of a cooling oil is likely to overheat to a notification device (28) when a state that at least one detection value is equal to or more than the threshold and when a state that at least one detection value is equal to or more than the threshold continues for a first duration (t1) or more.
    Type: Application
    Filed: March 15, 2019
    Publication date: November 19, 2020
    Inventors: Koji HYODO, Tetsuji TANAKA, Isamu AOKI, Kouji SHIMAZAKI
  • Patent number: 10801183
    Abstract: The work vehicle includes: a clutch device including a forward-travel clutch and a backward-travel clutch configured to cause, when being in an engagement state, the work vehicle to travel in a forward travel direction and a backward travel direction; a forward-backward travel instruction device configured to instruct the work vehicle to travel in the forward travel direction or the backward travel direction; a clutch state detection device configured to detect whether the forward-travel clutch and the backward-travel clutch are each in the engagement state; and a torque restriction section configured to restrict a maximum absorbing torque of the hydraulic pump to be low when a restriction condition holds, the restriction condition including a condition that a traveling direction of the work vehicle, which corresponds to an engagement state of the clutch device, and a traveling direction of the work vehicle, which is instructed by the forward-backward travel instruction device are opposite to each other.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: October 13, 2020
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kazuya Takeda, Isamu Aoki, Kazuo Ishida
  • Patent number: 10773590
    Abstract: The present invention relates to a work vehicle including an engine, a hydraulic pump, a hydraulic motor to drive wheels, an HST circuit in which the hydraulic pump and the hydraulic motor are connected to each other in the form of a closed circuit, a reducing agent sensor that detects the state of a reducing agent used to clean exhaust gas from the engine, and an engine restrictor that restricts the rotational speed of the engine based on the output from the reducing agent sensor, and the work vehicle further includes a control unit that changes the tilting angle of the hydraulic pump or the hydraulic motor independently of the rotational speed of the engine to a tilting angle associated with minimum travel drive force necessary for self-travel of the work vehicle when the control unit determines that the engine restrictor has restricted the rotational speed of the engine.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: September 15, 2020
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Masaki Nukii, Koji Hyodo, Isamu Aoki, Tetsuji Tanaka
  • Patent number: 10767342
    Abstract: The work vehicle includes an engine, a radiator; a hydraulic pump; a cooling fan that blows a cooling air to the radiator; a hydraulic motor which is driven by a pressure oil delivered from the hydraulic pump, and rotates the cooling fan; a directional control valve that switches a flow direction of the pressure oil from the hydraulic pump to rotate the hydraulic motor in forward and reverse directions; and a controller that controls the directional control valve so as to cause the repetitive operation of the forward and reverse rotation of the cooling fan to be performed at predetermined time intervals, in which the controller reduces the time intervals more than a normal time initially set when a relationship between the outside air temperature detected by the outside air temperature sensor and the refrigerant temperature detected by the refrigerant temperature sensor satisfies a predetermined condition.
    Type: Grant
    Filed: September 4, 2018
    Date of Patent: September 8, 2020
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Koji Hyodo, Isamu Aoki, Tetsuji Tanaka, Koji Shimazaki
  • Publication number: 20200248436
    Abstract: A wheel loader is provided that can reduce the traveling distance required for a raise and run operation, and reduce fuel consumption. A wheel loader 1 includes: an engine 3; a torque converter 41; a forward and reverse switch 62; a stepping amount sensor 610; an operation amount sensor 73; and a controller 5. The controller 5 determines whether a specific condition for specifying an operation of the lift arm 21 in an upper direction during forward travel of the vehicle body, on the basis of a forward and reverse switching signal, the stepping amount on the accelerator pedal 61, and a pilot pressure Ti pertaining to the lifting operation amount for the lift aim 21. When the specific condition is satisfied, the vehicle speed is limited by reducing the maximum rotational speed of the engine 3 in response to increase in the pilot pressure Ti.
    Type: Application
    Filed: September 4, 2018
    Publication date: August 6, 2020
    Inventors: Koji HYODO, Isamu AOKI, Tetsuji TANAKA, Koji SHIMAZAKI, Hironao SUZUKI
  • Patent number: 10704223
    Abstract: Provided is a work vehicle which is capable of appropriately setting the height of a work tool as a control threshold value for a ride control device or an automatic transmission control device, and which is excellent in operability, travel stability, and work efficiency. A value detected by an angle sensor (39) when a signal import switch (46) is operated by an operator is stored in a height position storage unit (35b) of a main controller (35) as height position information about a bucket (13) for excavation work. In the height position storage unit (35b), the height position of the bucket (13) for hauling work and the height position of the bucket (13) for loading work are stored in advance as offset values from the height position information about the bucket (13) for excavation work. In this way, the ride control device or the automatic transmission control device can be appropriately controlled regardless of the preference or habit of the operator.
    Type: Grant
    Filed: November 25, 2016
    Date of Patent: July 7, 2020
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Isamu Aoki, Koji Hyodo, Tetsuji Tanaka, Keigo Kikuchi
  • Publication number: 20200208377
    Abstract: Provided is a wheel loader capable of moving up a lift arm in a short time during excavation work. A wheel loader comprises a controller configured to control maximum traction force of the wheel loader and input torque of a working device hydraulic pump, and include a specific condition determination section configured to determine whether a specific condition for specifying excavation work is satisfied, an elapsed time measurement section configured to measure an elapsed time from start of the excavation work, and an input torque control section configured to limit the input torque to a first input torque value when the specific condition is satisfied and increase the input torque from the first input torque value when a second set time elapses from the elapse of a first set time.
    Type: Application
    Filed: December 26, 2018
    Publication date: July 2, 2020
    Inventors: Koji HYODO, Tetsuji TANAKA, Isamu AOKI, Kouji SHIMAZAKI, Jumpei KAMIYA
  • Publication number: 20200199852
    Abstract: A wheel loader is provided that can suppress abrupt change in vehicle speed accompanied by erroneous determination on a lift arm lifting operation. A wheel loader includes: an engine; an HST pump; an HST motor; a forward and reverse switch; a stepping amount sensor; an operation amount sensor; and a controller. The controller determines whether a specific condition for specifying an operation of the lift arm in an upper direction during forward travel of the vehicle body, on the basis of a forward and reverse switching signal, the stepping amount, and a pilot pressure pertaining to the lifting operation for the lift arm. In a case of the specific condition being satisfied, the vehicle speed is limited by controlling the displacement volume of the HST motor in conformity with increase in the pilot pressure.
    Type: Application
    Filed: September 4, 2018
    Publication date: June 25, 2020
    Inventors: Koji HYODO, Isamu AOKI, Tetsuji TANAKA, Masaki NUKII
  • Publication number: 20200131739
    Abstract: In an unloaded state of the bucket (3), a control device (30) calculates an unloaded moment (M0) around a hinge pin G from the pressure of the lift arm cylinder that is detected by pressure sensors (15a, 15b), the angle of a lift arm that is detected by a lift arm angle sensor 14, and dimension data extracted from a vehicle body information database (35). In a loaded state of the bucket, the control device calculates a loaded moment (M1) around the hinge pin G from the pressure of the lift arm cylinder, the angle of the lift arm, and the dimension data extracted from the vehicle body information database. The control device calculates the load (W) on the bucket by dividing the difference between the unloaded moment and the loaded moment by the horizontal distance (Lw) between the hinge pin and the gravity center position of the bucket.
    Type: Application
    Filed: September 19, 2018
    Publication date: April 30, 2020
    Inventors: Tomohiro UEDA, Masaki YOSHIKAWA, Takashi ISHII, Takayoshi MURAHASHI, Masakazu KAITOU, Koji SHIMAZAKI, Isamu AOKI
  • Publication number: 20200011025
    Abstract: The work vehicle includes an engine, a radiator; a hydraulic pump; a cooling fan that blows a cooling air to the radiator; a hydraulic motor which is driven by a pressure oil delivered from the hydraulic pump, and rotates the cooling fan; a directional control valve that switches a flow direction of the pressure oil from the hydraulic pump to rotate the hydraulic motor in forward and reverse directions; and a controller that controls the directional control valve so as to cause the repetitive operation of the forward and reverse rotation of the cooling fan to be performed at predetermined time intervals, in which the controller reduces the time intervals more than a normal time initially set when a relationship between the outside air temperature detected by the outside air temperature sensor and the refrigerant temperature detected by the refrigerant temperature sensor satisfies a predetermined condition.
    Type: Application
    Filed: September 4, 2018
    Publication date: January 9, 2020
    Inventors: Koji HYODO, Isamu AOKI, Tetsuji TANAKA, Koji SHIMAZAKI
  • Patent number: 10358794
    Abstract: A work vehicle, includes: a lift arm rotatably linked to a front portion of a vehicle body of a work vehicle so as to be allowed to swing along an up/down direction; an operation lever that can be operated within a range between a raising operation end position and a lowering operation end position, and is operated to raise and lower the lift arm; an up detent mechanism having a holding function for holding the operation lever at the raising operation end position once the operation lever is operated to the raising operation end position; and a down detent mechanism having a holding function for holding the operation lever at the lowering operation end position once the operation lever is operated to the lowering operation end position, wherein: when an angle of the lift arm becomes greater than a predetermined upper limit, the holding function of the up detent mechanism and the holding function of the down detent mechanism are disengaged.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: July 23, 2019
    Assignee: KCM Corporation
    Inventors: Tetsuji Tanaka, Yasunori Miyamoto, Koji Hyodo, Isamu Aoki, Katsuyuki Kirita, Hiroaki Yada, Seiji Nakagawa, Masaki Yoshikawa
  • Publication number: 20190010679
    Abstract: The work vehicle includes: a clutch device including a forward-travel clutch and a backward-travel clutch configured to cause, when being in an engagement state, the work vehicle to travel in a forward travel direction and a backward travel direction; a forward-backward travel instruction device configured to instruct the work vehicle to travel in the forward travel direction or the backward travel direction; a clutch state detection device configured to detect whether the forward-travel clutch and the backward-travel clutch are each in the engagement state; and a torque restriction section configured to restrict a maximum absorbing torque of the hydraulic pump to be low when a restriction condition holds, the restriction condition including a condition that a traveling direction of the work vehicle, which corresponds to an engagement state of the clutch device, and a traveling direction of the work vehicle, which is instructed by the forward-backward travel instruction device are opposite to each other.
    Type: Application
    Filed: March 2, 2017
    Publication date: January 10, 2019
    Inventors: Kazuya TAKEDA, Isamu AOKI, Kazuo ISHIDA
  • Patent number: 10071629
    Abstract: A prime mover control device of a work vehicle equipped with a torque converter includes: a speed ratio calculation unit that calculates a speed ratio of the torque converter; and a rotational speed limit unit that, when a speed ratio falls within a preset speed ratio range, limits a maximum rotational speed of the prime mover to be lower as compared with a maximum rotational speed set when a speed ratio falls without the preset speed ratio range. When a state in which the speed ratio calculated by the speed ratio calculation unit falls within the preset speed ratio range is maintained for a predetermined time period, the rotational speed limit unit changes a maximum rotational speed of the prime mover to a higher maximum rotational speed than the limited maximum rotational speed limited to be lower by the rotational speed limit unit.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: September 11, 2018
    Assignee: KCM Corporation
    Inventors: Isamu Aoki, Koji Hyodo, Tetsuji Tanaka, Masaki Nukii
  • Patent number: D854055
    Type: Grant
    Filed: May 23, 2016
    Date of Patent: July 16, 2019
    Assignee: KCM Corporation
    Inventors: Kazuhiko Hiraoka, Tomoyuki Miyata, Wataru Isaka, Satoshi Kan, Koji Hyodo, Masaki Yoshikawa, Isamu Aoki, Tetsuji Tanaka, Yasunori Miyamoto