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1. 发明申请

WO2021028073A1 HYDRAULIC CONTROL SYSTEM 审中-公开
公开(公告)号：WO2021028073A1
公开(公告)日：2021-02-18
申请号：PCT/EP2020/025360
申请日：2020-08-05
申请人： CATERPILLAR SARL
发明人： NAKAJIMA, Hideki , KIYASU, Koichi
IPC分类号： E02F9/22
摘要： PROBLEM: To improve operability and work efficiency while achieving reduction of the number of parts and simplification of circuit structure, in a hydraulic control system equipped with hydraulic actuators whose hydraulic power sources are both the first, second hydraulic pumps. SOLUTION: The hydraulic control system is provided with the stick directional switching valve (25); the main-side, sub-side supply oil passages (22, 18) connecting the hydraulic pumps (B, A) to the stick directional switching valve (25); and the stick flow rate control valve (28) which is placed in the sub-side supply oil passage, and controls the supply flow rate from the hydraulic pump (A) when the supply flow rate to the stick cylinder (8) requires the supply flow rates from both the hydraulic pumps (A, B), wherein the stick directional switching valve (25) is configured such that the discharge flow rate control is performed in the entire area of the spool stroke, and the supply flow rate control is performed at the first region (S1) of the former half of the spool stroke, but not performed at the second region (S2) of the latter half of the spool stroke.

2. 发明申请

WO2020119948A1 HYDRAULIC CONTROL CIRCUIT FOR A CONSTRUCTION MACHINE 审中-公开
公开(公告)号：WO2020119948A1
公开(公告)日：2020-06-18
申请号：PCT/EP2019/025455
申请日：2019-12-12
申请人： CATERPILLAR SARL
发明人： NAKAJIMA, Hideki , KIYASU, Koichi
IPC分类号： F15B11/17 , E02F9/22 , F15B11/024
摘要： [Problem to Be Solved] To make it possible to control supply, discharge, and recycled flow rates independently of each other for the boom cylinder in a construction machine comprising first and second boom spool valves respectively connected to first and second hydraulic pumps. [Solution] When the boom cylinder (8) is contracted, the first boom spool valve (16) is configured to control the recycled flow rate from head side oil chamber (8A) to rod side oil chamber (8B), the second boom spool valve (17) is configured to control the discharge flow rate from head side oil chamber (8A) to oil tank (15), and both first and second boom spool valves (16, 17) are configured not to supply pressure oil from, first and second hydraulic pumps (11, 12) to the boom cylinder (8).

3. 发明申请

WO2021228431A1 BOOM CONTROL CIRCUIT FOR A CONSTRUCTION MACHINE 审中-公开
公开(公告)号：WO2021228431A1
公开(公告)日：2021-11-18
申请号：PCT/EP2021/025168
申请日：2021-04-30
申请人： CATERPILLAR SARL
发明人： NAKAJIMA, Hideki , KIYASU, Koichi
IPC分类号： E02F9/22 , F15B21/02
摘要： To perform a work with the same operability under a dead weight of a front work equipment (4) in any of a float work and a normal work, when a bucket (7) descends in the air, and after contacting the ground, to perform a work with the operability being maintained as it is when performing the float work, and to perform a work while pressurised hydraulic fluid is supplied from a hydraulic pump (11) when performing the normal work. SOLUTION: A lowering control during a float working mode is performed in a valve passage state in a first region (Dl) at which the lowering control is performed under the dead weight of the front work equipment (4) without being supplied with hydraulic fluid from the hydraulic pump (11), regardless of whether or not the bucket (7) is in contact with the ground, and the lowering control during a normal working mode is performed in a valve passage state at the first region in a non-ground-contacting state and at a second region (D2) in which the hydraulic fluid can be supplied from the hydraulic pump (11) in a ground-contacting state.

4. 发明申请

WO2020119947A2 HYDRAULIC CONTROL CIRCUIT FOR A CONSTRUCTION MACHINE 审中-公开
公开(公告)号：WO2020119947A2
公开(公告)日：2020-06-18
申请号：PCT/EP2019/025453
申请日：2019-12-11
申请人： CATERPILLAR SARL
发明人： NAKAJIMA, Hideki , KIYASU, Koichi
IPC分类号： E02F9/22
摘要： [Problem to Be Solved] To make it possible to control supply, discharge, and recycled flow rates independently of each other for the stick cylinder in a construction machine comprising first and second stick spool valves respectively connected to first and second hydraulic pumps. [Solution] A poppet valve (20) is provided at upstream side of the first stick spool valve (18) for controlling a supply flow rate from first hydraulic pump (11), the first stick spool valve is configured to supply hydraulic flow from the poppet valve to the stick cylinder (9) without restricting the flow, and when the stick cylinder is extended, the poppet valve is configured to control supply flow rate from the first hydraulic pump to head side oil chamber, the first stick spool valve is configured to control recycled flow rate from a rod side oil chamber to the head side oil chamber, and the second stick spool valve is configured to control the supply flow rate from second hydraulic pump (12) to head side oil chamber and the discharge flow rate from the rod side oil chamber to an oil tank (15).

5. 发明申请

WO2022223151A1 HYDRAULIC CONTROL SYSTEM IN WORKING MACHINES 审中-公开
公开(公告)号：WO2022223151A1
公开(公告)日：2022-10-27
申请号：PCT/EP2022/025160
申请日：2022-04-20
申请人： CATERPILLAR SARL
发明人： NAKAJIMA, Hideki , KIYASU, Koichi , KOGA, Toshikazu
IPC分类号： E02F9/22
摘要： Problem to Be Solved: In optional control circuit commonly used among multiple optional hydraulic actuators, it is necessary to enable back pressure reduction, part reduction, and downsizing when a breaker is mounted as an optional hydraulic actuator. Solution: A normal control region (V), where the discharge valve passage (27f) to the oil tank (12) has an opening area of normal control range (Av), and a back pressure reduction region (W), where the discharge valve passage (27f) has the back pressure reduction opening Aw whose opening area is larger than the maximum opening area in the normal control range (Av), are installed at the operating position of optional control valve (27) for controlling discharge flow rate of optional hydraulic actuator (13); when the optional hydraulic actuator is the breaker, the optional control valve (27) is positioned at the back pressure reduction region (W), when the optional hydraulic actuator is not the breaker, the valve (27) is positioned at the normal control region (V).

6. 发明申请

WO2022167151A1 HYDRAULIC CONTROL SYSTEM 审中-公开
公开(公告)号：WO2022167151A1
公开(公告)日：2022-08-11
申请号：PCT/EP2022/025036
申请日：2022-02-03
申请人： CATERPILLAR SARL
发明人： NAKAJIMA, Hideki , KIYASU, Koichi
IPC分类号： E02F9/22 , F15B11/17
摘要： Problem to be solved: To avoid a large size of a direction change-over valve and enable accurate supply flow control when providing a flow control valve at an upstream side of the direction change-over valve to change the relationship between supply flow rate and discharge flow rate for a hydraulic actuator. Solution: The configuration is to control a supply flow rate to a stick cylinder (8) based on an opening area of the stick's direction change-over valve (25) and stick's flow control valve (28), calculate a target opening area of the stick's flow control valve (28) based on a target supply flow rate from hydraulic pumps A, B to the stick cylinder (8), the opening area of the stick's direction change-over valve (25), and a target differential pressure between hydraulic pump A and a load pressure of stick cylinder (8), and control the stick's flow control valve (28) so as to keep the target opening area calculated.

7. 发明申请

WO2021144143A1 HYDRAULIC CONTROL SYSTEM FOR A WORKING MACHINE 审中-公开
公开(公告)号：WO2021144143A1
公开(公告)日：2021-07-22
申请号：PCT/EP2021/025003
申请日：2021-01-08
申请人： CATERPILLAR SARL
发明人： NAKAJIMA, Hideki , KIYASU, Koichi
IPC分类号： E02F9/22 , F15B13/02 , F15B11/17 , E02F9/2242 , E02F9/2285 , E02F9/2292 , F15B2211/20546 , F15B2211/20576 , F15B2211/30595 , F15B2211/665 , F15B2211/6652 , F15B2211/6654 , F15B2211/7135 , F15B2211/7142
摘要： PROBLEM: To enable to arbitrarily change a hydraulic pump which supplies pressure oil to a hydraulic actuator at first in a hydraulic control system equipped with the hydraulic actuator using both first and second hydraulic pumps as a pressure oil source. SOLUTION: An operation means (mode setting means 70 and mode selection means 71) is installed which can arbitrarily change working order of the first flow rate control valves (30, 31) for boom and stick for controlling the supply flow rate from first hydraulic pump (14) to boom cylinder (11) and stick cylinder (12) and second flow rate control valves (33, 35) for boom and stick for controlling the supply flow rate from second hydraulic pump to boom cylinder (11) and stick cylinder (12).

8. 发明申请

WO2020078586A1 DRIFT-PREVENTION VALVE DEVICE, BLADE DEVICE, AND WORKING MACHINE 审中-公开
公开(公告)号：WO2020078586A1
公开(公告)日：2020-04-23
申请号：PCT/EP2019/025349
申请日：2019-10-15
申请人： CATERPILLAR SARL
发明人： ORIMOTO, Shuhei , KIYASU, Koichi , MAEDA, Hiroshi
IPC分类号： E02F3/815 , E02F9/22 , F15B1/00
摘要： [PROBLEM] To provide a drift-prevention valve device, a blade device, and a working machine capable of operating an actuated unit and preventing the machine body from drifting with a simple configuration. [SOLUTION] The drift-prevention valve device is provided with a non- return valve 41 that allows the flow of hydraulic oil from a control valve 28 to a head chamber 34h of a blade cylinder 34 and blocks the flow of the hydraulic oil in the reverse direction; and a piston accommodation part 42 separately disposed from an accommodation part 70 of the non-return valve 41, configured to movably accommodate a power piston 43. The power piston 43 defines a first piston chamber 42pl communicating with a rod chamber of 34r of the blade cylinder 34 and a second piston chamber 42p2 for drain positioned on a poppet 71 side of the non- return valve 41 and communicating with a tank 52. The power piston 43 is connected to the poppet 71 of the non-return valve 41, so that the power piston 43 can be operated by the difference between the urging force of the poppet 71 by a spring 72 of the non-retum valve 41 and a rod chamber pressure of the blade cylinder 34.

9. 发明申请

WO2023025413A1 HYDRAULIC CONTROL SYSTEM IN EXCAVATOR TYPE CONSTRUCTION MACHINE 审中-公开
公开(公告)号：WO2023025413A1
公开(公告)日：2023-03-02
申请号：PCT/EP2022/025384
申请日：2022-08-19
申请人： CATERPILLAR SARL
发明人： NAKAJIMA, Hideki , KIYASU, Koichi
IPC分类号： E02F9/12 , E02F9/22
摘要： Problem to Be Solved: To investigate an opening area control of a flow control valve disposed on upstream side of the stick's direction change-over valve when using the flow control valve as a valve for restricting the supply flow rate to stick cylinder during interlocking operation of the swiveling motor and stick cylinder. Solution: A configuration is provided to control the opening area of the stick's first flow control valve (30) based on a target supply flow rate to the stick cylinder (9), target differential pressure between first hydraulic pump A and supply pressure to the stick cylinder (9), and opening area of supply valve passage (25e) to the stick's direction change-over valve and also control that the differential pressure is set larger as operating amount of swiveling manipulator increases during interlocking operation of the swiveling motor (11) and stick cylinder (9) and the opening area of stick's first flow control valve (30) is made smaller as the differential pressure increases.

10. 发明申请

WO2021160342A1 VALVE CALIBRATION SYSTEM AND CALIBRATION METHOD 审中-公开
公开(公告)号：WO2021160342A1
公开(公告)日：2021-08-19
申请号：PCT/EP2021/025044
申请日：2021-02-05
申请人： CATERPILLAR SARL
发明人： NAKAJIMA, Hideki , KIYASU, Koichi
IPC分类号： F15B19/00 , E02F9/20 , F16K37/00 , F15B13/043
摘要： PROBLEM: To achieve improvement in work efficiency of calibration work and improvement in calibration accuracy, by performing control so that the time taken to increase the sweep of an applied current becomes substantially constant, upon the calibration of a valve opening position current value when a valve operated by electrical current applied to an electrical actuator opens a flow passage. SOLUTION: There is provided a predicted value calculating means (24) for predicting a calibration value of a valve opening position current value on the basis of information concerning valve opening position current values, and the sweep starting current value (iS) is set so that the time taken to increase the sweep to a predicted value (iE) predicted by the predicted value calculating means (24) from a sweep start becomes a fixed time (T).

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