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EP0875631A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Cooling device for a construction machine

Assignee: Caterpillar Japan Ltd
•
Filing: 1997-03-17
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Granted: —
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Expires: 2017-03-17
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Abstract

Abstract A radiator (12a) and an oil cooler (12b) are disposed separately from an engine (11) of a construction machine and cooled by a cooling fan (15). The oil cooler (12b) is located downstream from the radiator (12a) with respect to the air flow generated when the cooling fan (15) is driven in reverse. A hydraulic motor (32) is adapted to be controlled by a directional control solenoid valve (34) of a fan driving circuit (31) so that the cooling fan (15) may be stopped, rotated forward or rotated in reverse accordingly. The directional control solenoid valve (34) is adapted to be automatically switched by a control device (41) having temperature sensors (44),(45),(46). The control device (41) is adapted to rotate the cooling fan (15) in reverse in cases where the temperature of the cooling water is not lower than a given temperature while the temperature of the hydraulic oil is lower than a given temperature, thereby causing the warm air which has passed the radiator (12a) to warm the hydraulic oil in the oil cooler (12b) and also causing back flow of the air to discharge debris lodged in the radiator (12a) and other components.

Inventors

  • 👤 Yoshinori Yamagishi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 09:11
CPC Classifications
F; F01; F01P; F01P5/00; F01P5/02; F01P5/04; F01P5/043; E; E02; E02F; E02F9/00; E02F9/08; E02F9/0858; E02F9/0866; E02F9/0875; E02F9/20; E02F9/22; E02F9/226; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/4061

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 95 words
A construction machine cooling device including a radiator and an oil cooler which are disposed separately from an engine and subject to forced cooling by a cooling fan, the radiator having a function of cooling the cooling water for the engine, and the oil cooler having a function of cooling the hydraulic oil for the hydraulic equipment, wherein said cooling device further includes a fan driving circuit which is capable of selectively switching the mode of operation of the cooling fan so that the cooling fan may be stopped, rotated forward or rotated in reverse.
Claim 2
Dependent Claim 145 words
A construction machine cooling device including a radiator and an oil cooler which are disposed separately from an engine and subject to forced cooling by a cooling fan, the radiator having a function of cooling the cooling water for the engine, and the oil cooler having a function of cooling the hydraulic oil for the hydraulic equipment, wherein said cooling device further includes a fan driving circuit which is capable of switching the mode of operation of the cooling fan so that the cooling fan may be stopped, rotated forward or rotated in reverse, and a control device adapted to switch the mode of operation of the cooling fan based on the temperature of the outside air, the temperature of the cooling water and the temperature of the hydraulic oil so that the cooling fan may be stopped, rotated forward or rotated in reverse accordingly.
Claim 3
Dependent Claim 26 words
A construction machine cooling device as claimed in claim 1, wherein the direction of rotation of the cooling fan can be changed over by manual operation.
Claim 4
Dependent Claim 171 words
A construction machine cooling device as claimed in claim 2, wherein the oil cooler is located downstream from the radiator with respect to the air flow generated when the cooling fan is driven in reverse, and the control device is adapted to maintain the cooling fan at a standstill even after the engine is started in cases where the temperatures of the outside air, the cooling water and the hydraulic oil are all lower than the respectively given temperatures, rotate the cooling fan in reverse in cases where the temperature of the hydraulic oil is lower than a given temperature in the state where the temperature of the cooling water is not lower than a given temperature, thereby warming up the hydraulic oil in the oil cooler by using the warm air that has passed the radiator, and, when the temperatures of the cooling water and the hydraulic oil have both reached or exceed their respective given temperatures, rotate the cooling fan forward, thereby cooling both cooling water and hydraulic oil.
Claim 5
Dependent Claim 71 words
A construction machine cooling device as claimed in claim 2, wherein the control is adapted to rotate the cooling fan for a given length of time after the engine is started and thereafter rotates the cooling fan in the forward direction in cases where the temperature of the outside air, the temperature of the cooling water or the temperature of the hydraulic oil is higher than a temperature specifically given therefor.

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