Operating oil temperature controller for hydraulic drive device
A driving device and control device technology, which is applied in fluid pressure actuating devices, lifting devices, fluid pressure actuating system components, etc., and can solve problems such as unstable movements and difficult oil temperature stability
Inactive Publication Date: 2012-05-23
HITACHI CONSTR MASCH CO LTD
View PDF6 Cites 12 Cited by
- 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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
In order to keep fluctuations of the operating oil temperature small, a control unit (12) for controlling a flow rate control valve (11) comprises: a first calculation means for obtaining an energy element for increasing the temperature of operating oil; a first setting means for setting a second relationship between the flow rate through an oil cooler (9) and the energy element for increasing the temperature of the operating oil, the second relationship being set corresponding to a first relationship between the flow rate through the oil cooler (9) and the heat release amount of the oil cooler (9) that are experimentally and empirically known, and being obtained by replacing the heat release amount of the oil cooler (9) in the first relationship with the energy element for increasing the temperature of the operating oil; and a second calculation means for obtaining the flow rate through the oil cooler (9) on the basis of the second relationship set by the first setting means, wherein the flow rate control valve (11) is controlled according to the flow rate through the oil cooler (9) obtained by the second calculation means.
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): F15B21/04E02F9/22F15B21/0423
CPCE02F9/2095B66F9/22F15B21/042E02F9/226E02F9/2235E02F9/2296F15B2211/40515F15B2211/426F15B2211/41554F15B2211/66F15B2211/6654F15B2211/62F15B2211/6326F15B2211/6323F15B2211/6336F15B2211/6309F15B21/0423F15B21/04E02F9/22F15B13/02
Inventor 近藤聪美
Owner HITACHI CONSTR MASCH CO LTD