公开(公告)号：US12129627B2

公开(公告)日：2024-10-29

申请号：US17638290

申请日：2021-03-12

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Shinichiro Tanaka ,  Hiroyasu Kodera

IPC: E02F9/20 ,  B60T7/04 ,  B60T8/32 ,  B60T8/36 ,  B60T8/58 ,  B60T8/94 ,  B60T13/68 ,  E02F3/28 ,  E02F9/26 ,  B60T13/14

CPC classification number: E02F9/2083 ,  B60T7/042 ,  B60T8/326 ,  B60T8/361 ,  B60T8/58 ,  B60T8/94 ,  B60T13/686 ,  E02F9/2004 ,  E02F9/264 ,  B60T13/148 ,  B60T2220/04 ,  B60T2250/02 ,  B60T2250/04 ,  B60T2270/402 ,  B60T2270/404 ,  B60T2270/82 ,  E02F3/283 ,  E02F9/26

Abstract: Provided is a work vehicle capable of satisfying a user's demand to brake performance in a flexible manner. A wheel loader 1 comprises a controller 5 storing a plurality of control characteristics each of which is set such that a brake valve control pressure Pi of a solenoid proportional valve 45 increases as a pedal angle θ of a brake pedal 43 increases, and under the condition where a pedal angle θ is equal to or less than a predetermined pedal angle θ, an increase rate of the brake valve control pressure Pi with respect to the pedal angle θ varies. In a case where the pedal angle θ detected by a potentiometer 33 is equal to or less than the predetermined pedal angle θth, the controller 5, calculates the brake valve control pressure Pi based on the selected one control characteristic.

公开(公告)号：US11027775B2

公开(公告)日：2021-06-08

申请号：US16640363

申请日：2019-03-05

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Shinichiro Tanaka ,  Hiroyasu Kodera

IPC: B62D5/07 ,  E02F9/22

Abstract: The operability can be improved when the rotational speed of the engine is low and the working device actuator and the steering actuator are operated in a combined manner, while the configuration of prioritizing the operation of the steering actuator is maintained. A control device (70) included in a wheel loader (1) determines whether a working device (4) is in load lifting operation or not based on the pressure that is between a working device directional switching valve (44) and an orifice (45) and is detected by a pressure sensor (71), and reduces the opening area of a steering control valve (37) when determining that the rotational speed of an engine (14) detected by a rotational speed sensor (72) is equal to or less than a predetermined threshold (Ns) and a working device is in the load lifting operation.

公开(公告)号：US09915056B2

公开(公告)日：2018-03-13

申请号：US14646193

申请日：2013-11-19

Applicant: KABUSHIKI KAISHA KCM ,  HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Shinichiro Tanaka ,  Hiroyasu Kodera

IPC: F15B13/00 ,  E02F9/22 ,  F15B11/17 ,  F15B1/00 ,  F15B11/02

CPC classification number: E02F9/2242 ,  E02F9/225 ,  E02F9/226 ,  E02F9/2282 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296 ,  F15B1/00 ,  F15B11/02 ,  F15B11/17 ,  F15B2211/20523 ,  F15B2211/20538 ,  F15B2211/20546 ,  F15B2211/20553 ,  F15B2211/20576 ,  F15B2211/30595 ,  F15B2211/633 ,  F15B2211/6343 ,  F15B2211/6346 ,  F15B2211/7135 ,  F15B2211/7142 ,  F15B2211/781

Abstract: In a hydraulic drive system, hydraulic oil discharged from an actuator pump is supplied to an actuator via an actuator drive circuit. In the hydraulic drive system, the hydraulic oil discharged from a fan pump is supplied to a cooling fan motor via a fan drive circuit, and the cooling fan motor rotates a cooling fan at a rotational speed corresponding to the flow rate of the hydraulic oil supplied to the cooling fan motor. A merge circuit connects the actuator drive circuit and the fan drive circuit to each other to cause the hydraulic oil flowing through the actuator drive circuit to merge into the hydraulic oil flowing through the fan drive circuit. When the merge condition is satisfied, the controller controls the merge circuit to connect the actuator drive circuit and the fan drive circuit to each other.

公开(公告)号：US20160319848A1

公开(公告)日：2016-11-03

申请号：US15107954

申请日：2014-12-15

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Shinichiro Tanaka ,  Hiroyasu Kodera

IPC: F15B11/048 ,  F15B15/04 ,  F15B15/24 ,  B62D5/06 ,  F04B49/22 ,  B62D5/08 ,  B62D5/10 ,  F15B5/00 ,  F04B49/06

CPC classification number: F15B11/048 ,  B62D5/062 ,  B62D5/065 ,  B62D5/07 ,  B62D5/08 ,  B62D5/10 ,  B62D6/02 ,  E02F9/0841 ,  E02F9/2228 ,  E02F9/225 ,  E02F9/2296 ,  F04B1/295 ,  F04B1/324 ,  F04B49/065 ,  F04B49/225 ,  F04B2205/09 ,  F15B5/00 ,  F15B11/162 ,  F15B15/04 ,  F15B15/24 ,  F15B2211/30535 ,  F15B2211/45 ,  F15B2211/50563 ,  F15B2211/50572 ,  F15B2211/5151 ,  F15B2211/5756 ,  F15B2211/781

Abstract: A hydraulic drive system (1) including a meter-in compensator (37) and a bleed-off compensator (42) comprises a plurality of sensors (64 to 68), a controller (62), and an outlet pressure switching valve (61) The controller (62) determines whether or not the state of a wheel loader (2) which is detected based on the signals output from the sensors (64 to 68) meets a predetermined steering limiting condition. When the controller (62) determines that the state of the wheel loader (2) meets the steering limiting condition, it outputs a command signal to the outlet pressure switching valve (61). The outlet pressure switching valve (61) reduces the flow rate of the hydraulic oil flowing to steering cylinders (18L, 18R), in response to the command signal in such a manner that the flow rate becomes lower than that corresponding to the operation amount of a handle of a steering device (35).

Abstract translation: 包括补偿器（37）和泄放补偿器（42）的液压驱动系统（1）包括多个传感器（64至68），控制器（62）和出口压力切换阀（61） ）控制器（62）确定基于从传感器（64至68）输出的信号检测到的轮式装载机（2）的状态是否满足预定的转向限制条件。 当控制器（62）确定轮式装载机（2）的状态满足转向限制条件时，它向出口压力切换阀（61）输出命令信号。 出口压力切换阀61响应于指令信号使流量变得低于对应于操作量的操作量的方式降低流向转向缸（18L，18R）的液压油的流量 转向装置（35）的手柄。