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Work machine

A technology of operating machinery and operating devices, which is applied in the direction of mechanical equipment, mechanically driven excavators/dredgers, earth movers/shovels, etc., and can solve the problems that the valve control characteristics cannot be corrected, and the valve flow control performance cannot be maintained.

Active Publication Date: 2022-04-12
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in working machines, since the oil temperature is usually obtained by a temperature sensor installed in the hydraulic oil tank, there is a difference between the output value of the temperature sensor and the temperature around the valve to be controlled or the temperature of the hydraulic oil passing through the throttle. Deviation occurs, and as a result, the valve control characteristics cannot be completely corrected by the controller, and there is a possibility that the flow control performance of the valve cannot be maintained

Method used

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Experimental program
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Effect test

Embodiment 1

[0040] Figure 2A and Figure 2B It is a circuit diagram of the hydraulic drive device in the first embodiment of the present invention.

[0041] (1) Structure

[0042] The hydraulic drive device 400 in the first embodiment includes three main hydraulic pumps driven by an engine not shown, for example, the first hydraulic pump 1, the second hydraulic pump 2 and 3rd hydraulic pump 3. In addition, a pilot pump 4 driven by an engine (not shown) is provided, and a hydraulic oil tank 5 for supplying oil to the first to third hydraulic pumps 1 to 3 and the pilot pump 4 is provided.

[0043] The tilt angle of the first hydraulic pump 1 is controlled by a regulator attached to the first hydraulic pump 1 . The regulator of the first hydraulic pump 1 includes a flow rate control command pressure port 1a, a first hydraulic pump self-pressure port 1b, and a second hydraulic pump self-pressure port 1c. The tilt angle of the second hydraulic pump 2 is controlled by a regulator attached...

Embodiment 2

[0097] Regarding the second embodiment of the present invention, the differences from the first embodiment will be mainly described.

[0098] (1) Structure

[0099] The structure of the hydraulic drive device in the application of the first embodiment of the present invention is the same as that of the hydraulic drive device 400 ( Figure 2A and Figure 2B shown) are almost the same, but differ in the following respects.

[0100] In the first embodiment, all the auxiliary flow control devices 1 to 29 are equipped with temperature sensors, but since the temperature of the working oil passing through each auxiliary flow control device connected to the same discharge line is about the same, it is necessary to obtain a temperature sensor from one auxiliary flow control device. The temperature of the working oil passing through the auxiliary flow control device can be approximated by the temperature of the working oil passing through other auxiliary flow control devices. Therefo...

Embodiment 3

[0107] Figure 12A and Figure 12B It is a circuit diagram of the hydraulic drive device in the third embodiment of the present invention.

[0108] (1) Structure

[0109] The structure of the hydraulic drive device in the third embodiment is the same as that of the hydraulic drive device 400 in the first embodiment ( Figure 2A and Figure 2B shown) are almost the same, but differ in the following respects.

[0110] Oil passages 42 and 43 connected to the directional control valve 7 for the bucket, oil passages 44 and 45 connected to the directional control valve 8 for the second arm, and oil passage 46 connected to the directional control valve 9 for the first boom , 47 are respectively provided with one-way valves 412, 413, 414 to prevent reverse flow from the actuator side to the pump side.

[0111] The oil passages 52 and 53 connected to the supply port of the directional control valve 10 for the second boom, the oil passages 54 and 55 connected to the supply port of ...

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Abstract

Provided is a work machine capable of maintaining control accuracy of an actuator regardless of temperature variation of hydraulic oil passing through a flow rate control device that controls a supply flow rate to the actuator. To this end, the flow rate control device is provided with: a valve body which is disposed in a main oil passage connecting a discharge line of a hydraulic pump and an actuator, and which moves in accordance with the operating pressure from an electromagnetic proportional pressure reducing valve; a sampling oil passage branched from the main oil passage; and a temperature sensor provided in the sampling oil passage, and the controller corrects a command electrical signal to the electromagnetic proportional pressure reducing valve in accordance with a signal from the temperature sensor.

Description

technical field [0001] The present invention relates to working machines such as hydraulic excavators. Background technique [0002] Working machines such as hydraulic excavators generally operate by sending hydraulic oil supplied from a hydraulic pump to a hydraulic actuator through a valve to drive the actuator. At this time, the flow rate of hydraulic oil delivered to the actuator is controlled according to the valve opening amount corresponding to the operation instruction amount generated by the operating device. It can be said that the flow control performance of the valve determines the control accuracy of the actuator. Therefore, high flow rate controllability and high robustness for stably exhibiting the performance are required for the valve. [0003] However, in work machines operating in various environments, the ambient temperature of the vehicle body and the temperature of the hydraulic oil are often greatly different or changed depending on the operating regi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22
CPCF15B21/045F15B13/0433F15B2211/327F15B2211/329F15B2211/355F15B2211/6343F15B2211/6346F15B2211/6355F15B13/0405F15B2211/351F15B2211/6336F15B2211/6654F15B2211/6309F15B2211/6313F15B11/042E02F9/2282E02F9/2285E02F9/2292E02F9/2296E02F9/2228E02F9/2267E02F3/435F15B2211/30535F15B13/026F15B13/042F15B13/027F15B13/0402E02F9/22F15B2211/20546F15B2211/20576E02F3/32E02F3/425E02F9/2004E02F9/2203E02F9/2271E02F9/26F15B13/025F15B13/044
Inventor 熊谷贤人井村进也钓贺靖贵千叶孝昭天野裕昭西川真司楢崎昭广
Owner NIHON KENKI CO LTD