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.
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.
References Cited (Backward Citations)
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