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公开(公告)号：USD915469S1
公开(公告)日：2021-04-06
申请号：US29698505
申请日：2019-07-17
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公开(公告)号：US10947701B2
公开(公告)日：2021-03-16
申请号：US16980055
申请日：2019-09-24
发明人： Koji Hyodo , Tetsuji Tanaka , Isamu Aoki , Masaki Nukii , Yuki Ahiko
摘要： 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 Pα corresponding to flat ground traveling and smaller than load pressure Pγ corresponding to an excavation operation, increase maximum rotational speed of the engine 3 only within the predetermined pressure range.-
公开(公告)号：US10947699B2
公开(公告)日：2021-03-16
申请号：US16461491
申请日：2018-02-06
发明人： Teppei Saitoh , Takamasa Kai , Kenji Hiraku , Hiromasa Takahashi , Juri Shimizu
IPC分类号： E02F9/22 , F15B11/028 , F15B11/17 , F15B20/00
摘要： A construction machine incorporates a hydraulic closed circuit system capable of suppressing, even where a selector valve is stuck in an open state by a failure of the selector valve or a control system therefor, unintended operation of a hydraulic actuator and continuing operation of a machine body. The construction machine includes first sensors that detect open-closed states of a plurality of switching valves, first compulsory valve closing devices that change over the plurality of switching valves to a closed position irrespective of open-close control by a machine body controller, and a valve device controller that controls, when it is detected based on the open-closed states of the plurality of selector values detected by the first sensors that one of the plurality of selector values is stuck in an open state, the first compulsory valve closing device such that other selector valve connected to one of the plurality of closed circuit pumps to which the one selector valve is connected is closed.
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公开(公告)号：US20210070166A1
公开(公告)日：2021-03-11
申请号：US16644855
申请日：2019-02-15
发明人： Katsuyuki KIRITA , Masamichi TANAKA , Yuuto ABE
IPC分类号： B60K15/063 , F02M37/00
摘要： A work vehicle including: a drive device that has an internal combustion engine for driving a vehicle body; a first tank for storing fuel to be supplied to the internal combustion engine; and a second tank for storing fuel to be supplied to the internal combustion engine; wherein the first tank is disposed in front of or behind the drive device, and the second tank is disposed below the drive device so as to be separated from the first tank by a predetermined distance.
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公开(公告)号：US20210039503A1
公开(公告)日：2021-02-11
申请号：US16642906
申请日：2018-09-18
发明人： Akinori ISHII
摘要： A haulage vehicle includes a body, a load measurement device that measures a mounted load value of the body, a traveling electric motor, and a travel control device that outputs an electric motor command value, the travel control device sets a backward movement limiting set value to ON when it is determined that the haulage vehicle is in execution of either loading work or dumping work, and sets the backward movement limiting set value to OFF when a forward position signal and an accelerator pedal command value are inputted, an electric motor command value formed of a backward movement limiting command value is outputted to the traveling electric motor when the backward movement limiting set value is ON, and an electric motor command value formed of a normal command value is outputted to the traveling electric motor when the backward movement limiting set value is OFF.
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公开(公告)号：US10907666B2
公开(公告)日：2021-02-02
申请号：US15755342
申请日：2016-09-29
发明人： Seiji Hijikata , Yasutaka Tsuruga , Kenji Hiraku , Kouji Ishikawa
摘要： It is an object of the present invention to provide a hydraulic drive system that effectively utilizes a hydraulic fluid accumulated in an accumulator to make it possible to achieve a substantial improvement in terms of efficiency for a work machine as a whole. A hydraulic drive system includes: a first hydraulic pump; a first hydraulic actuator driven by being supplied with a hydraulic fluid from the first hydraulic pump; a first line for supplying the hydraulic fluid from the first hydraulic pump to the first hydraulic actuator; a first pump flow adjustment device installed in the first line, the first pump flow adjustment device being configured to adjust; a first hydraulic accumulator for accumulating the hydraulic fluid delivered from the first hydraulic pump; and a first accumulation flow adjustment device configured to adjust the flow of the hydraulic fluid from the first hydraulic pump to the first hydraulic accumulator. The hydraulic drive system further comprises a first accumulation flow supply device configured to supply the hydraulic fluid accumulated in the first hydraulic accumulator to the first hydraulic actuator via a second line different from the first line.
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67.发明申请公开(公告)号：US20210005402A1
公开(公告)日：2021-01-07
申请号：US16979339
申请日：2019-07-04
摘要： A safety switch input diagnosis device includes a circuit formed from a series connection of an emergency stop switch and a line having a resistor. A connection state of the emergency stop switch and failure modes of the lines are diagnosed on the basis of a voltage value at one end of the circuit. Consequently, an operation of the switch and failure modes of a circuit relating to the switch can be diagnosed.
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公开(公告)号：US10885786B2
公开(公告)日：2021-01-05
申请号：US16328938
申请日：2017-09-15
发明人： Wataru Tanaka , Masaki Kanai , Tomoyuki Hamada
IPC分类号： G08G1/16 , G05D1/02 , G08G1/0968
摘要： A protected region is set for a manned working machine, said region including a first protected region in which new protected region setting request information is not transmitted and which includes the position of the manned working machine, and a second protected region which is set along a periphery of the first protected region and in which new protected region setting request information is transmitted. An area occupied by the vehicle body of the manned working machine on a plane projected on the ground surface is calculated on the basis of vehicle body information indicating the size of the vehicle body of the manned working machine and position information thereof. When the occupied area is present within the first protected region, new protected region setting request information is not transmitted, whereas when the occupied area is present within the second protected region, protected region setting request information is transmitted.
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公开(公告)号：US20200378089A1
公开(公告)日：2020-12-03
申请号：US16641718
申请日：2018-09-28
发明人： Koji HYODO , Yuki AHIKO , Tetsuji TANAKA , Isamu AOKI , Masaki NUKII , Masashi YAMASHITA
摘要： 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.
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公开(公告)号：US10801532B2
公开(公告)日：2020-10-13
申请号：US16327928
申请日：2017-03-29
IPC分类号： F15B21/14 , E02F9/22 , E02F9/20 , E02F3/42 , E02F3/43 , F15B11/10 , F15B1/02 , E02F3/32 , F15B21/047 , F15B21/044 , F15B21/08 , F15B1/033
摘要： A work machine including: a hydraulic cylinder 20 configured to drive a work implement 3; a control valve 22 configured to connect a delivery line of a hydraulic pump 21 switchingly to a bottom fluid chamber and a rod fluid chamber of the hydraulic cylinder 20 and a tank; a pilot pump 23 configured to output a pilot pressure to drive the control valve 22; an engine 24 configured to drive the hydraulic pump 21 and the pilot pump 23; and an accumulator 26 configured to accumulate a return hydraulic fluid from the hydraulic cylinder 20 is provided with: a bypass line 41 configured to connect the bottom fluid chamber of the hydraulic cylinder 20 and a delivery line 21a of the hydraulic pump 21 by bypassing the control valve 22 and be provided with the accumulator 26 thereon; a pressure-accumulation control valve 27 provided between the bottom fluid chamber of the hydraulic cylinder 20 and the accumulator 26; a release control valve 28 provided between the accumulator 26 and the delivery line 21a; and a hydraulic system controller 30 configured to open the release control valve 28 if an engine revolution speed N becomes lower than a set value Ns.
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