Patents by Inventor Tetsuji Tanaka
Tetsuji Tanaka 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: 12012725Abstract: Provided is a loading work vehicle capable of improving work efficiency even when working on a slippery road surface. An HST-traveling-drive wheel loader 1 comprises a step-on amount detection sensor 610, a discharge pressure detection sensor 75, a mode switch device 60, and a controller 5. The controller 5 is configured to: determine whether a limit mode is selected by the mode switch device 60; specify an operation state of the wheel loader 1 when determining that the limit mode is selected; limit maximum traction force to a first set value which is set based on a static friction coefficient ? and vehicle weight when specifying that a bucket 23 is pushed into a natural ground 100; and increase the maximum traction force from the first set value when specifying that excavation of the natural ground 100 is started.Type: GrantFiled: September 28, 2018Date of Patent: June 18, 2024Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Koji Hyodo, Masaki Yoshikawa, Tetsuji Tanaka, Masaki Nukii
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Patent number: 11905682Abstract: Provided is a wheel loader capable of automatically decreasing vehicle speed without making an operator feel discomfort during a loading operation. A wheel loader 1 mounted with a torque converter type traveling drive system comprises a controller 5 configured to control shifting of a transmission 32. When a vehicle body travels forward at vehicle speed corresponding to a second speed stage set greater by one speed stage than the lowest speed stage of the transmission 32 while operating the lift arm 21 upwardly, the controller 5 sets, as a gear ratio of the transmission 32, an intermediate gear ratio between a gear ratio corresponding to the second speed stage and a gear ratio corresponding to a first speed stage, and outputs a signal for selecting a combination of a plurality of gears corresponding to the set gear ratio to each first to fifth solenoid control valves 32A to 32E.Type: GrantFiled: December 25, 2019Date of Patent: February 20, 2024Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Tetsuji Tanaka, Masaki Nukii, Keisuke Naitou
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Patent number: 11753799Abstract: Provided is a work vehicle which can prevent an engine from stalling regardless of type of a system mounted on a vehicle body. In a wheel loader 1 equipped with a loading work device 11 operated by an electric operation lever 19, first and second directional control valves 5, 6 include neutral positions 5N, 6N for causing hydraulic oil discharged from a hydraulic pump 12 to return to a hydraulic oil tank 10, respectively, and in the case where a discharge pressure P of the hydraulic pump 12 is a main relief pressure Pr or more and an engine rotational speed N is less than a low idle rotational speed NL, a controller 2, 2A restricts the output of control signals to first and second solenoid control valves 3, 4 so as to cause the first and second directional control valves 5, 6 to be switched to the neutral positions 5N, 6N, respectively.Type: GrantFiled: March 15, 2021Date of Patent: September 12, 2023Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Yasunori Miyamoto, Tetsuji Tanaka
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Patent number: 11745290Abstract: A metal member-welded structure includes: a Cu member; an Al member; and a welded portion formed by melting and solidifying each of materials of the Cu member and the Al member. The Cu member includes a Cu-based material containing Cu as a main component. The Al member includes an Al-based material containing Al as a main component and a plating layer that covers a side of the Al-based material, the side being close to a surface of the Cu member. The welded portion includes a sea-island structure in a vicinity of the surface of the Cu member. The sea-island structure includes: a plurality of island portions containing pure Al, and a sea portion interposed among the island portions. The sea portion has a eutectic structure having: a phase of an intermetallic compound of Cu and Al; and a phase of pure Al.Type: GrantFiled: July 24, 2019Date of Patent: September 5, 2023Assignees: Sumitomo Electrical Industries, Ltd., AutoNetworks Technologies, Ltd, Sumitomo Wiring Systems, Ltd.Inventors: Koki Sugimura, Tetsuya Kuwabara, Kazuhiro Goto, Hiroki Hirai, Tetsuji Tanaka, Junichi Ono, Takuji Otsuka, Kenji Miyamoto, Osamu Nakayama, Kazuaki Hamada, Kazuhiro Washio
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Publication number: 20230085666Abstract: Provided is a work vehicle capable of reducing the fuel consumption while maintaining the working efficiency. A wheel loader 1 comprising a vehicle body controller 5, 5A for controlling an engine 41, wherein the vehicle body controller 5, 5A limits an upper limit rotational speed of the engine 41 based on an accelerator pedal step-on amount ?, a brake pedal step-on amount ?, a torque converter speed ratio e which is a ratio of a rotational speed of a torque converter 42, a discharge pressure P1 of a loading hydraulic pump 44, and a stroke amount S1 of lift arm cylinders 22 or a stroke amount S2 of a bucket cylinder 24.Type: ApplicationFiled: September 15, 2021Publication date: March 23, 2023Inventors: Takuya SHIMOMURA, Masaki YOSHIKAWA, Tetsuji TANAKA, Isamu AOKI, Kazuyuki ITO, Kouji SHIMAZAKI, Keisuke NAITOU
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Patent number: 11572674Abstract: 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: GrantFiled: September 24, 2019Date of Patent: February 7, 2023Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Tetsuji Tanaka, Koji Hyodo, Yasunori Miyamoto, Isamu Aoki
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Patent number: 11505921Abstract: A wheel loader configured to reduce the traveling distance required for a raise and run operation, and reduce fuel consumption 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 arm 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: GrantFiled: September 4, 2018Date of Patent: November 22, 2022Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Koji Hyodo, Isamu Aoki, Tetsuji Tanaka, Koji Shimazaki, Hironao Suzuki
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Publication number: 20220356677Abstract: Provided is a work vehicle which can prevent an engine from stalling regardless of type of a system mounted on a vehicle body. In a wheel loader 1 equipped with a loading work device 11 operated by an electric operation lever 19, first and second directional control valves 5, 6 include neutral positions 5N, 6N for causing hydraulic oil discharged from a hydraulic pump 12 to return to a hydraulic oil tank 10, respectively, and in the case where a discharge pressure P of the hydraulic pump 12 is a main relief pressure Pr or more and an engine rotational speed N is less than a low idle rotational speed NL, a controller 2, 2A restricts the output of control signals to first and second solenoid control valves 3, 4 so as to cause the first and second directional control valves 5, 6 to be switched to the neutral positions 5N, 6N, respectively.Type: ApplicationFiled: March 15, 2021Publication date: November 10, 2022Inventors: Yasunori MIYAMOTO, Tetsuji TANAKA
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Patent number: 11401695Abstract: 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: GrantFiled: December 25, 2019Date of Patent: August 2, 2022Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Koji Hyodo, Masaki Yoshikawa, Kazuyuki Ito, Tetsuji Tanaka, Kouji Shimazaki, Isamu Aoki
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Patent number: 11391017Abstract: 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: GrantFiled: September 4, 2018Date of Patent: July 19, 2022Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Koji Hyodo, Isamu Aoki, Tetsuji Tanaka, Masaki Nukii
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Patent number: 11380946Abstract: A coolant includes a refrigerant, a porous plate-shaped heat insulator, and an enclosure in which the refrigerant and the heat insulator are enclosed in a sealed state, and the heat insulator has a thermal conductivity per unit area of 300 W/(K·m2) or less and a thickness equal to or greater than 0.5 mm and equal to or less than 10.0 mm.Type: GrantFiled: September 13, 2018Date of Patent: July 5, 2022Assignees: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO WIRING SYSTEMS, LTD., AUTONETWORKS TECHNOLOGIES, LTD.Inventors: Koma Numata, Masatoshi Majima, Kazuki Okuno, Hiroki Hirai, Tetsuji Tanaka, Makoto Higashikozono, Junichi Ono
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Patent number: 11371213Abstract: 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: GrantFiled: December 26, 2018Date of Patent: June 28, 2022Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Koji Hyodo, Tetsuji Tanaka, Isamu Aoki, Kouji Shimazaki, Jumpei Kamiya
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Patent number: 11274745Abstract: To curb temperature rises in a control device for a supercharger and extend the life of the control device for the supercharger, a work vehicle includes a variable geometry supercharger with variable boost pressure, and a working device driven by pressure oil discharged from a working hydraulic pump, the work vehicle further including: a supercharger control device adapted to control the supercharger; a temperature detection device adapted to detect temperature of the supercharger control device; and a main control device adapted to limit at least one of maximum rotational speed of an engine and maximum vehicle speed of the work vehicle in case the temperature of the supercharger control device is above a predetermined temperature as compared to case the temperature of the supercharger control device is below the predetermined temperature.Type: GrantFiled: December 14, 2016Date of Patent: March 15, 2022Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Koji Hyodo, Masashi Yamashita, Tetsuji Tanaka, Katsutaka Hara, Masaki Nukii, Isamu Aoki
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Patent number: 11242672Abstract: A wheel loader configured to reduce a sudden change in vehicle speed caused by an erroneous determination of a raising operation of a lift arm is provided. A wheel loader 1 includes an engine 3, a variable displacement type HST pump 41, a variable displacement type HST motor 42 coupled to the HST pump 41 in a closed circuit, a hydraulic pump for working device 43, a forward/reverse selector switch 62 for switching a forward movement and a backward movement of a vehicle body, a depression amount sensor 610 that detects a depression amount of an accelerator pedal 61, a pressure sensor 73 that detects a discharge pressure Pa of the hydraulic pump for working device 43, and a controller 5. The controller 5 determines whether a specific condition to identify an upward movement of a lift arm 21 during a forward travel of the vehicle body based on a forward/reverse switching signal, the depression amount of the accelerator pedal 61, and the discharge pressure Pa detected by the pressure sensor 73.Type: GrantFiled: September 29, 2017Date of Patent: February 8, 2022Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Koji Hyodo, Isamu Aoki, Tetsuji Tanaka, Koji Shimazaki, Hironao Suzuki
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Patent number: 11180901Abstract: 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: GrantFiled: March 15, 2019Date of Patent: November 23, 2021Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Koji Hyodo, Tetsuji Tanaka, Isamu Aoki, Kouji Shimazaki
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Publication number: 20210355657Abstract: A wheel loader configured to reduce a sudden change in vehicle speed caused by an erroneous determination of a raising operation of a lift arm is provided. A wheel loader 1 includes an engine 3, a variable displacement type HST pump 41, a variable displacement type HST motor 42 coupled to the HST pump 41 in a closed circuit, a hydraulic pump for working device 43, a forward/reverse selector switch 62 for switching a forward movement and a backward movement of a vehicle body, a depression amount sensor 610 that detects a depression amount of an accelerator pedal 61, a pressure sensor 73 that detects a discharge pressure Pa of the hydraulic pump for working device 43, and a controller 5. The controller 5 determines whether a specific condition to identify an upward movement of a lift arm 21 during a forward travel of the vehicle body based on a forward/reverse switching signal, the depression amount of the accelerator pedal 61, and the discharge pressure Pa detected by the pressure sensor 73.Type: ApplicationFiled: September 29, 2017Publication date: November 18, 2021Inventors: Koji HYODO, Isamu AOKI, Tetsuji TANAKA, Koji SHIMAZAKI, Hironao SUZUKI
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Publication number: 20210339339Abstract: A metal member-welded structure includes: a Cu member; an Al member; and a welded portion formed by melting and solidifying each of materials of the Cu member and the Al member. The Cu member includes a Cu-based material containing Cu as a main component. The Al member includes an Al-based material containing Al as a main component and a plating layer that covers a side of the Al-based material, the side being close to a surface of the Cu member. The welded portion includes a sea-island structure in a vicinity of the surface of the Cu member. The sea-island structure includes: a plurality of island portions containing pure Al, and a sea portion interposed among the island portions. The sea portion has a eutectic structure having: a phase of an intermetallic compound of Cu and Al; and a phase of pure Al.Type: ApplicationFiled: July 24, 2019Publication date: November 4, 2021Applicants: Sumitomo Electric Industries, Ltd., AutoNetworks Technologies, Ltd, Sumitomo Wiring Systems, Ltd.Inventors: Koki SUGIMURA, Tetsuya KUWABARA, Kazuhiro GOTO, Hiroki HIRAI, Tetsuji TANAKA, Junichi ONO, Takuji OTSUKA, Kenji MIYAMOTO, Osamu NAKAYAMA, Kazuaki HAMADA, Kazuhiro WASHIO
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Publication number: 20210317637Abstract: Provided is a wheel loader capable of automatically decreasing vehicle speed without making an operator feel discomfort during a loading operation. A wheel loader 1 mounted with a torque converter type traveling drive system comprises a controller 5 configured to control shifting of a transmission 32. When a vehicle body travels forward at vehicle speed corresponding to a second speed stage set greater by one speed stage than the lowest speed stage of the transmission 32 while operating the lift arm 21 upwardly, the controller 5 sets, as a gear ratio of the transmission 32, an intermediate gear ratio between a gear ratio corresponding to the second speed stage and a gear ratio corresponding to a first speed stage, and outputs a signal for selecting a combination of a plurality of gears corresponding to the set gear ratio to each first to fifth solenoid control valves 32A to 32E.Type: ApplicationFiled: December 25, 2019Publication date: October 14, 2021Inventors: Tetsuji TANAKA, Masaki NUKII, Keisuke NAITOU
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Patent number: 11130156Abstract: A vibrating sieve machine for applying vibrations on powder to be classified that is placed on a mesh member through a sieve frame including a plurality of separable sieve frames for sieving and classification, wherein the mesh member includes a circular annular mesh member frame having an outer peripheral surface and configured to be sandwiched by the separable sieve frames with the outer peripheral surface exposed outward in a radial direction of the separable sieve frames, a reinforcement mesh stretching across the mesh member frame, a sieve mesh configured to cover the reinforcement mesh, hanging down over an outer peripheral surface of the mesh member frame, and a fastening band configured to be attached to the outer peripheral surface of the mesh member frame so as to sandwich the sieve mesh between the fastening band and the outer peripheral surface of the mesh member frame.Type: GrantFiled: October 10, 2018Date of Patent: September 28, 2021Assignee: FUJINO INDUSTRIES CO., LTD.Inventors: Tatsunori Tatsumoto, Tetsuji Tanaka, Yoshihiro Ueno, Kiyosei Inaba
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Publication number: 20210270016Abstract: 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: ApplicationFiled: December 25, 2019Publication date: September 2, 2021Inventors: Koji HYODO, Masaki YOSHIKAWA, Kazuyuki ITO, Tetsuji TANAKA, Kouji SHIMAZAKI, Isamu AOKI