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Hydraulic drive mechanism

A driving device and hydraulic technology, which is applied to fluid pressure actuators, earth movers/shovels, servo motors, etc., can solve problems such as productivity decline, productivity decline, and combination errors, so as to improve productivity and increase production sexual effect

Inactive Publication Date: 2007-09-19
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] As mentioned above, in the prior art, it is desired that the flow rate set by the flow control valve is set by the specifications of the independent hydraulic equipment, so the flow rate, that is, the actuator speed of the hydraulic excavator will be affected by each hydraulic equipment. Influenced by differences in performance, resulting in a decrease in productivity during mass production
In addition, even with the same equipment structure, in the case of many models, the productivity of simultaneous production of multiple models may decrease due to the wrong combination of parts.

Method used

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Embodiment Construction

[0080] Embodiments of the present invention will be described below using the drawings.

[0081] FIG. 1 is a diagram showing a hydraulic drive device according to a first embodiment of the present invention.

[0082] In FIG. 1 , the hydraulic drive device according to this embodiment has an engine 1 , a pump unit 100 , a control valve unit 4 , a plurality of actuators 5 a , 5 b , and 5 c , and an oil tank 13 . The pump unit 100 includes a variable hydraulic pump 2 as a main pump driven by an engine 1, a quantitative hydraulic pump 3 as a pilot pump, and a pump tilt control mechanism that controls the tilt (capacity) of the hydraulic pump 2. 8. The control valve unit 4 is composed of a plurality of valve sections 4a, 4b, 4c, an inlet section 4d, and first and second control sections 4e, 4f. The valve sections 4a, 4b, 4c correspond to the actuators 5a, 5b, 5c respectively, only three are shown here, but actually there are more (described later). In addition, the first and sec...

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Abstract

A hydraulic pressure drive device capable of increasing mass productivity and productivity in simultaneous production of multiple models. The pressure drive device has an engine (1), a pump unit (100), actuators (5a, 5b, 5c), a control valve unit (4), and an engine speed detection means (4f). The pump unit (100) has a pump tilting control mechanism (8) for load sensing control. The control valve unit (4) has flow rate control valves (15a, 15b, 15c) and pressure compensation valves (10a, 10b, 10c). The engine speed detection means (4f) has a first differential pressure reducing valve (14) for outputting an engine rotation speed-dependent pressure as an absolute pressure, and is included in the valve unit (4). An output pressure from the first differential pressure reducing valve (14) is led as a target load sensing differential pressure to the pump tilting mechanism (8) of the pump unit (100) via a piping (127).

Description

technical field [0001] The present invention relates to a hydraulic driving device for construction machines such as hydraulic excavators, and in particular to a method for carrying out load transmission in such a way that the discharge pressure of a hydraulic pump is only higher than the highest load pressure among a plurality of actuators by a target pressure difference. Sensitive control, and a hydraulic drive device that sets the target differential pressure in load sensing control as a variable value depending on the engine speed. Background technique [0002] Such hydraulic drive devices are described in, for example, Japanese Patent Application Laid-Open No. 5-99126 (Patent Document 1), Japanese Patent Laid-Open No. 10-196604 (Patent Document 2), and the like. In these conventional technologies, the flow rate supplied to each actuator is controlled by a hydraulic pump and a control valve (flow control valve) subjected to load sensing control. The pressure difference ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/00E02F9/22
CPCF15B2211/20553F15B11/055F15B11/165E02F9/2225E02F9/2292E02F9/2232F15B2211/20523F15B2211/652F15B2211/30535E02F9/2296F15B2211/253E02F9/22F15B11/00
Inventor 钓贺靖贵川本纯也高桥究伊藤健二
Owner NIHON KENKI CO LTD