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公开(公告)号：US20210317637A1
公开(公告)日：2021-10-14
申请号：US17271743
申请日：2019-12-25
发明人： Tetsuji TANAKA , Masaki NUKII , Keisuke NAITOU
IPC分类号： E02F9/22
摘要： 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.
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公开(公告)号：US11142887B2
公开(公告)日：2021-10-12
申请号：US16644288
申请日：2018-07-23
发明人： Akira Watanabe , Ken Takeuchi , Tadashi Osaka
摘要： An engine cooling system (22) includes an engine (11), an engine cooling pipe line (23), an engine water pump (24) and an engine radiator (25). An electricity storage device cooling system (27) includes an electricity storage device (19), an electricity storage device cooling pipe line (28), an electricity storage device water pump (29) and an electricity storage device radiator (31). Different heat-transfer media (engine cooling water and electricity storage device cooling water) flow respectively in the engine cooling system (22) and the electricity storage device cooling system (27). Further, a heating heat exchanger (32) is provided in the halfway of the engine cooling pipe line (23) and in the halfway of the electricity storage device cooling pipe line (28) for performing heat exchange between the engine cooling water and the electricity storage device cooling water.
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公开(公告)号：US20210285550A1
公开(公告)日：2021-09-16
申请号：US16330438
申请日：2018-01-31
发明人： Tomohiko IWANAMI , Hayato MASUDA
IPC分类号： F16J15/34 , E02F9/02 , F16J15/40 , F16J15/447 , B62D55/15
摘要： A labyrinth (32) is provided in a gap (22) formed between a fixed-side end surface (13E) of a fixed-side housing and a rotation-side end surface (15C) of a rotation-side housing (15). The labyrinth (32) is constituted by a fixed-side recessed part (13F), a fixed-side fitting projecting part (13G), a rotation-side fitting projecting part (15D), and a rotation-side recessed part (15E). First and second fabric-like members (33), (34) formed annularly by a fabric-like material are provided in the fixed-side recessed part (13F) and the rotation-side recessed part (15E), respectively. A grease accommodating space (35) in which grease (G) is filled is provided between the first fabric-like member (33) and the second fabric-like member (34).
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公开(公告)号：US20210270014A1
公开(公告)日：2021-09-02
申请号：US17272838
申请日：2019-11-01
发明人： Takeshi SHIINA
摘要： To provide a technique where a case of shutting off a battery shutoff switch while a key switch is on is detected, and a warning according to a risk can be issued at time of restart.
A construction machine includes: the key switch, an engine start switch, an engine stop switch, a notification device, a controller, and the battery shutoff switch. The controller chronologically stores operation histories of the key switch, engine start switch, and engine stop switch in a history storage section in a non-volatile manner. The controller determines, on the basis of the stored operation history, a risk content in a case of shutting off the battery shutoff switch while the key switch is on. In a case where, the controller is restarted by resuming the battery shutoff switch and turning on the key switch, the controller controls the notification device so that the notification device issues a warning according to the risk content, on the basis of a result of the determination.-
公开(公告)号：US11105070B2
公开(公告)日：2021-08-31
申请号：US16330378
申请日：2017-03-31
摘要： To increase frequency of use of auto idle, an engine is accelerated even more quickly than before and work involving a heavy load can be performed within a short period of time when an operator resumes work and recovers a speed of the engine. When an operation lever device is operated and the speed is low because of auto idle control, a pilot pump is unloaded to thereby reduce load torque on the engine. Operation of a compressor is also suspended while an air conditioner is operating. Furthermore, for a target speed of the engine, a speed at which work can be performed is set and the engine is accelerated. When the engine thereafter reaches a predetermined speed or a predetermined period of time thereafter elapses, the pilot pump is loaded and the operation of the compressor for the air conditioner is resumed.
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公开(公告)号：US11104316B2
公开(公告)日：2021-08-31
申请号：US16329390
申请日：2018-03-05
发明人： Takayuki Sato , Takaaki Tanaka , Hidefumi Ishimoto
摘要： An autonomous traveling vehicle, equipped with autonomous traveling function on a standard machine, has a high-pressure selector valve placed on a flow path in which pressure-oil is supplied from a standard brake valve (SBV) installed in the standard machine to a hydraulic brake. A flow path is installed to connect the high-pressure selector valve and an autonomous brake control valve (ABCV) that is supplied with pressure-oil delivered by a hydraulic pump. Further, an autonomous traveling controller is installed to perform control for autonomous travel, and an autonomous brake controller is installed to perform open or close control on the ABCV in response to a braking instruction from the autonomous traveling controller. When the brake pedal is stepped on, the pressure-oil flows from the SBV to the hydraulic brake, and when the autonomous traveling controller outputs a stop instruction, the pressure-oil flows from the ABCV to the hydraulic brake.
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公开(公告)号：US20210262200A1
公开(公告)日：2021-08-26
申请号：US17255934
申请日：2019-09-03
IPC分类号： E02F9/22 , E02F3/43 , F15B11/028 , F15B11/042 , F15B11/044 , F15B11/05 , F15B11/16
摘要： To provide a construction machine that can highly precisely control branch flows from a hydraulic pump to a plurality of hydraulic actuators without being affected by load conditions. A controller (100) has a meter-out valve control section (140) configured to calculate a target opening area of a second meter-out valve (65a) (65b) according to a pressure difference between a supply pressure and a second meter-in pressure, or calculate a target opening area of a first meter-out valve (55a) (55b) according to a pressure difference between the supply pressure and the first meter-in pressure.
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公开(公告)号：US20210230837A1
公开(公告)日：2021-07-29
申请号：US17054797
申请日：2019-06-07
发明人： Ryu NARIKAWA , Hiroshi SAKAMOTO , Hidekazu MORIKI
摘要： A work machine includes a plurality of actuators that drive a work device; a posture sensor that senses postural data about the work device; and a controller having a degree-of-proximity calculating section that computes a degree of proximity that is an index value indicating proximity between an intrusion prohibition region and the work device on the basis of positional data about the intrusion prohibition region and the postural data. A command section executes, when the proximity specified by the degree of proximity is closer than proximity specified by a degree-of-proximity threshold, operating area limiting control to decelerate at least one of the plurality of actuators such that an intrusion of the work device into the intrusion prohibition region is prevented. History of the data about the degree of proximity calculated at the degree-of-proximity calculating section is stored and the degree-of-proximity threshold is altered on the basis of the history data.
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公开(公告)号：US11041288B2
公开(公告)日：2021-06-22
申请号：US16329387
申请日：2018-02-08
发明人： Kohei Hiromatsu , Manabu Edamura , Shiho Izumi
摘要： A hydraulic excavator acquires operation content frequency data in a designated period based on output values output from a plurality of sensors sensing parameters that serve as indicators of operation contents performed via an operation device. A storage section stores a plurality of guide screens each corresponding to one of a plurality of work patterns of the hydraulic excavator. A work identifying section searches actual result data in the storage section for actual result data that matches or is similar to the operation content frequency data acquired by the data acquiring section in terms of operation contents and frequency thereof, and that identifies a current work pattern based on a work pattern allocated to actual result data related to a result of the search. A display device displays a guide screen corresponding to the work pattern identified by the work identifying section among the plurality of guide screens.
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公开(公告)号：US20210164196A1
公开(公告)日：2021-06-03
申请号：US16641484
申请日：2019-03-22
摘要： A work vehicle provided with a loading hydraulic circuit (A), including at least a main hydraulic pump (31), a lift aim cylinder (8) and a control valve (32), an auxiliary hydraulic pump (31), a negative parking brake device (PB), and a parking brake releasing hydraulic circuit (B2), in which the vehicle includes: a loading operation hydraulic circuit (B1) located upstream of the parking brake releasing hydraulic circuit; an emergency flow path (80) for supplying the pressure oil discharged from the auxiliary hydraulic pump to the parking brake device through the loading operation hydraulic circuit in an emergency; and a valve unit (81) located in the emergency flow path. If the pressure of the parking brake releasing hydraulic circuit is lower than the brake release pressure to release the braking state of the parking brake device, the valve unit is switched to the communicating position.
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