COOLING DEVICE FOR CONSTRUCTION MACHINERY

• US 20120057989A1
• Filed: 12/18/2009
• Published: 03/08/2012
• Est. Priority Date: 12/18/2008
• Status: Active Grant

• Current Assignee: HD Hyundai Infracore Co., Ltd.
• Original Assignee: Doosan Infracore Company Limited
• Inventors: Cho, Yun Su
• Granted Patent: US 8,579,595 B2
• Time in Patent Office: Days
• US Class Current: 417/46
• CPC Class Codes: E02F 9/0866 Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment
• CPC Class Codes: E02F 9/0875 Arrangement of valve arrangements on superstructures arrangement of hydraulic hoses E02F9/2275 takes precedence; valves per se E02F9/2267
• CPC Class Codes: E02F 9/226 Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
• CPC Class Codes: E02F 9/2296 Systems with a variable displacement pump
• CPC Class Codes: F01P 5/043 Pump reversing arrangements
• CPC Class Codes: F01P 7/044 using hydraulic drives

Abstract

A cooling device of a construction machine according to the present invention includes: two or more hydraulic motors that rotate positively and reversibly to correspond to a supplying direction of pressure oil and drives rotatably cooling fans connected thereto, respectively; a switching valve switching rotation directions of the two or more hydraulic motors by switching the supplying direction of the pressure oil supplied to the two or more hydraulic motors from the hydraulic motor; and flow rate makeup valves controlling an additional flow supplied upstream of the two or more hydraulic motors when a pressure drop is generated upstream of the two or more hydraulic motors on the basis of the supplying direction of the pressure oil.

Claims

1. A cooling device for a construction machine, comprising:

two or more hydraulic motors that rotate positively and reversibly to correspond to a supplying direction of pressure oil and drives rotatably cooling fans connected thereto, respectively;

a switching valve switching rotation directions of the two or more hydraulic motors and by switching the supplying direction of the pressure oil supplied to the two or more hydraulic motors from the hydraulic motor; and

flow rate makeup valves controlling an additional flow supplied upstream of the two or more hydraulic motors when a pressure drop is generated upstream of the two or more hydraulic motors on the basis of the supplying direction of the pressure oil.

2. The device of claim 1, wherein the flow rate makeup valves are equipped by two or more and make up the flow to each pressure drop region of the two or more hydraulic motors.

3. The device of claim 2, wherein the two or more flow rate makeup valves receive the flow from an oil tank, and

at least one of the two or more flow rate makeup valves is installed on a hydraulic line L4 connecting a hydraulic line L1, which connects the switching valve with the hydraulic pump, with the oil tank.

4. The device of claim 3, further comprising:

a hydraulic line L2 guiding the pressure oil drained from the switching valve to the oil tank,

wherein the hydraulic line L4 on which at least one of the two or more flow rate makeup valves is installed is the hydraulic line connecting the hydraulic line L2, which connects the oil tank with the switching valve, and the hydraulic line L1 connecting the switching valve with the hydraulic pump.

5. The device of claim 2, wherein the two or more flow rate makeup valves receive the flow from the oil tank, and

at least one of the two or more flow rate makeup valves is installed on a hydraulic line L5 connecting the two or more hydraulic motors with the oil tank.

6. The device of claim 5, further comprising:

the hydraulic line L2 guiding the pressure oil drained from the switching valve to the oil tank,

wherein the hydraulic line L5 on which at least one of the two or more flow rate makeup valves is installed connects the hydraulic line L2, which connects the oil tank with the switching valve, and a hydraulic line L3 connecting the two or more hydraulic motors to each other.