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Operating oil temperature controller for hydraulic drive device

A technology of driving device and control device, which is applied in the direction of fluid pressure actuating device, lifting device, fluid pressure actuating system components, etc., can solve the problems of difficult oil temperature constant and unstable action

Inactive Publication Date: 2014-11-05
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to keep the oil temperature constant
Therefore, in the prior art, there is a concern that the operation of the hydraulic pump and / or the hydraulic driver, etc. becomes unstable due to the change in the viscosity of the working oil due to the change in the oil temperature.

Method used

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  • Operating oil temperature controller for hydraulic drive device
  • Operating oil temperature controller for hydraulic drive device
  • Operating oil temperature controller for hydraulic drive device

Examples

Experimental program
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Embodiment Construction

[0022] Hereinafter, embodiments of the hydraulic oil temperature control device of the hydraulic drive system according to the present invention will be described based on the drawings.

[0023] figure 1 is a hydraulic circuit diagram showing the first embodiment of the working oil temperature control device of the hydraulic drive device according to the present invention, figure 2 It is a graph showing the relationship between the passing flow rate of the oil cooler and the heat dissipation amount of the oil cooler known from experiments or experience, image 3 It is a graph showing the relationship between the passing flow rate of the oil cooler set by the first setting mechanism included in the control unit of the first embodiment and the energy element that raises the temperature of the hydraulic oil, Figure 4 It is a graph showing the relationship between the passing flow rate of the oil cooler and the passing flow rate of the flow control valve set by the second setti...

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Abstract

A control unit for controlling a flow rate control valve includes a first computing unit for determining an energy component that heats hydraulic oil, a first setting unit for setting a second relationship between a flow rate through an oil cooler and the energy component based on an experimentally or empirically known, first relationship between flow rate through the oil cooler and an amount of oil cooler heat radiation as derived by replacing the amount of oil cooler heat radiation in the first relationship to the energy component, and a second computing unit for determining the flow rate through the oil cooler based on the energy component determined by the first computing unit and the second relationship. The control unit controls the flow rate control valve according to the flow rate determined by the second computing unit.

Description

technical field [0001] The present invention relates to a working oil temperature control device of a hydraulic drive device provided in construction machinery such as a hydraulic excavator whose load fluctuates rapidly. Background technique [0002] There is a technology disclosed in Patent Document 1 as a conventional hydraulic oil temperature control device for a hydraulic drive device. This prior art is provided in a hydraulic drive device of construction machinery having an engine, a hydraulic pump, a hydraulic driver, a directional control valve, a return oil circuit returning to the working oil tank, and an oil cooler arranged in the return oil circuit, and includes : A non-cooling oil circuit that bypasses the oil cooler provided in the return oil circuit; a flow control valve provided in the non-cooling oil circuit and controlling the flow rate of the working oil flowing in the non-cooling oil circuit, That is, an electromagnetic switch valve; a control unit that o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B21/04E02F9/22F15B21/0423
CPCB66F9/22E02F9/2095E02F9/226E02F9/2235F15B21/042E02F9/2296F15B2211/40515F15B2211/426F15B2211/41554F15B2211/66F15B2211/6654F15B2211/62F15B2211/6326F15B2211/6323F15B2211/6336F15B2211/6309F15B21/0423F15B21/04E02F9/22F15B13/02
Inventor 近藤聪美
Owner NIHON KENKI CO LTD