JPH0587227U - Cooling equipment for construction machinery - Google Patents

Abstract

(57) [Summary] [Purpose] In the cooling device of the prior art, the oil cooler and the radiator were installed side by side in series in a close-integrated type, so the direction of passage of the cooling air was constant and the radiator or oil cooler did not overheat. When I was about to wake me up, I couldn't handle it. In addition, it is difficult to clean the radiator from clogging. The present invention aims to solve the above problems. [Structure] A space is provided between the facing surfaces of the oil cooler and the radiator, and the space space is surrounded by the duct plate and the louver mechanism. By operating or controlling the louver mechanism, a part of the external air is louvered. The air was sucked into the space through the mechanism. Further, by rotating the louver mechanism with respect to the duct plate, the gap space portion is opened and the radiator can be easily cleaned.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling device for a construction machine such as a hydraulic excavator, which is equipped with a radiator and an oil cooler.

[0002]

[Prior Art]

 FIG. 7 is a partial cutaway rear view of the hydraulic excavator. In the figure, 1 is a lower traveling body of the hydraulic excavator, 2 is an upper revolving structure, 3 is a guard plate forming the outer peripheral surface of the upper revolving structure 2, 4 is a cooling air intake port, 5 is an exhaust port, and 6 is The engine compartment, 7 is a water-cooled engine, 8 is a cooling fan, 9 is a radiator, 10 is an oil cooler, and 11 is an engine hood. FIG. 8 is a partially cutaway plan view showing the radiator 9 and the oil cooler 10. In the figure, 12 is an oil pipe for cooling the oil cooler 10.

Next, a conventional cooling device will be described with reference to FIGS. 7 and 8. A radiator 9 and an oil cooler 10 are provided side by side, and an engine compartment 6 is surrounded by a guard plate 3. One side of the guard plate 3 is provided with a cooling air intake port 4, and the other side is provided with an exhaust port 5. The air is sucked in through the suction port 4 by the fan 8, passes through the fins for the oil pipe 12 of the oil cooler 10, the fins of the radiator 9, the engine compartment 6, and is discharged from the discharge port 5. There is.

When the hydraulic excavator is working, the heated engine cooling water passes through the radiator 9, and the return oil of the operating oil whose temperature has risen passes through the oil pipe 12 of the oil cooler 10. Since the fan 8 is rotated by the rotation of the engine 7, the outside air passes through the oil cooler 10 and the radiator 9 to exchange heat while flowing in the directions of arrows a, b, c, d, and e. The hydraulic oil and the engine cooling water are cooled.

[0005]

In the conventional cooling device, the oil cooler and the radiator are provided in series, so that the radiator is cooled by the air passing through the oil cooler. When the hydraulic oil temperature rises, the temperature of the air that has passed through the oil cooler rises, which lowers the cooling efficiency of the radiator and may cause engine overheating. Also, the temperature of the hydraulic oil does not rise, but only the engine cooling water temperature may rise due to the work contents of the hydraulic excavator and the influence of the ambient temperature. In this case, I want to keep the cooling of the oil cooler small to cool the radiator more strongly, but it is not convenient because I can not cope with it.

[0006] In addition, since the amount of earth and sand and dust is very large at the site where the hydraulic excavator operates and clogging occurs between the fins of the radiator, the cooling efficiency of the radiator decreases. In this case, even if you try to clean with jet water or pressurized air, the radiator and the oil cooler are close to each other and are integrated, and the engine side of the radiator is a fan and shroud (not shown). It was blocked by and could not be cleaned. An object of the present invention is to provide a cooling device that can solve the above problems.

[0007]

[Means for Solving the Problems]

 According to the present invention, a gap is provided between the facing surfaces of the oil cooler for cooling the hydraulic oil and the radiator for cooling the engine, a part of the outer circumference of the space is surrounded by a fixed duct plate, and the other part of the outer circumference is left. A louver mechanism capable of opening and closing the louver plate is attached to and surrounded by the louver plate, and when the louver mechanism is opened, a part of the external air is sucked into the gap space through the louver mechanism.

A water temperature sensor and an oil temperature sensor for the hydraulic oil circuit system are provided in the engine cooling water circuit system, and the water temperature sensor and the oil temperature sensor and the actuator for opening / closing the louver mechanism are connected via a controller. The louver mechanism is opened by a command signal from the controller when the hydraulic oil temperature is lower than the reference set temperature and the engine cooling water temperature is close to or higher than the reference set temperature.

In addition, the louver mechanism is rotatably attached to the duct plate via a pin, and when cleaning the radiator, the louver mechanism is rotated about the pin to rotate the louver mechanism. The side space portion on the side was opened.

[0010]

【Example】

 FIG. 1 is a partially cutaway plan view of a hydraulic excavator having a cooling device according to the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as those in the prior art. 2'is an upper revolving structure, 6'is an engine compartment, 9'is a radiator, 10 'is an oil cooler, 13 is a space between facing surfaces of the oil cooler 10' and the radiator 9 ', 14 is a duct plate, 15 Is a louver mechanism, 16 is a louver plate of the louver mechanism 15, 17 is an actuator for opening / closing the louver mechanism 15, and 18 is high temperature air near the outer periphery of the engine 7 when the louver mechanism 15 is opened so as not to be entrained in the space 13. FIG. 2, which is an insertion preventing object provided, is a diagram showing a control circuit 19 for controlling the actuator 17 for opening and closing the louver mechanism 15. In the figure, 20 is a controller, 21 is a memory (ROM) of the controller 20, 22 is a water temperature sensor, and 23 is an oil temperature sensor. The memory 21 stores in advance the water temperature and the oil temperature, which serve as the judgment criteria in the engine cooling water circuit system and the hydraulic oil circuit system.

FIG. 3 is a partially cutaway rear view of the hydraulic excavator showing a state in which the louver mechanism 15 is opened. FIG. 4 is a detailed view of part A of FIG. In the figure, 24 is a frame body of the louver mechanism 15, 25 is a louver link, 26 is a transmission shaft, 27 is a bracket fixed to the duct plate 14 side, and 28 is a bracket 27 that pivotally supports the frame body 24. It's a pin. FIG. 5 is a detailed view of part B of FIG. FIG. 6 is a view showing a state in which the louver mechanism 15 of FIG. 4 is opened.

Next, the configuration of the cooling device according to claim 1 of the present invention will be described with reference to FIG. A space is provided between the facing surfaces of the oil cooler 10 'and the radiator 9', and a part of the outer periphery of the space portion 13 is surrounded by a fixed duct plate 14, and the other part of the outer periphery of the louver plate 16 is surrounded. An openable and closable louver mechanism 15 is attached and surrounded, and when the louver mechanism 15 is opened, external air is sucked into the space 13 through the louver mechanism 15. The actuator (17) for opening / closing the louver mechanism 15 in claim 1 may be, for example, an electric motor operated by a switch operation, a cylinder operated by hydraulic pressure or pneumatic pressure, or a mechanical operation manual operation.

Next, the configuration of the cooling device according to the second aspect of the present invention will be described with reference to FIG. The cooling device according to claim 1, wherein a water temperature sensor 22 is provided in the engine cooling water circuit system, and an oil temperature sensor 23 is provided in the hydraulic oil circuit system. The water temperature sensor 22 and the oil temperature sensor 23, and the louver mechanism 15 are opened and closed. When the hydraulic oil temperature is lower than the reference set temperature and the engine cooling water temperature is close to or higher than the reference set temperature, the command signal from the controller 20 The louver mechanism 15 is opened.

Next, the configuration of the cooling device according to claim 3 of the present invention will be described with reference to FIG. In the cooling device according to claim 1 or 2, when the frame 24 of the louver mechanism 15 is rotatably attached to the bracket 27 on the duct plate 14 side via the pin 28 to clean the radiator 9 '. By rotating the louver mechanism 15 with the pin 28 as the rotation center, the space 13 inside the duct plate 14 is opened.

Next, the operation of the cooling device of the present invention will be described. As the actuator (17) for opening and closing the louver mechanism 15, for example, an electric motor that operates by a switch operation, a cylinder that operates hydraulically or pneumatically, or a cooling device that includes a mechanically operated manually, Judges and operates the louver mechanism 15. That is, when the driver determines to sufficiently cool the oil cooler 10 ', the louver plate 16 of the louver mechanism 15 is closed. The cooling effect in this case is the same as in the case of the prior art. However, when the driver wants to suppress the cooling of the oil cooler 10 'to be small and to cool the radiator 9'stronger, the louver mechanism 15 is opened. As shown in FIG. 3, a part of the external air sucked in from the suction port 4 in the direction of the arrow A flows in the direction of the arrow, and the space between the louver plates 16 of the louver mechanism 15 which is opened is indicated by the arrow. Flow through the gap space 13, the radiator 9 ′, the engine chamber 6 ′, and the discharge port 5. The other part of the external air flows in the directions of arrows B, C, D, and E, and is discharged to the outside. Therefore, when the louver mechanism 15 is opened, the radiator 9'can be cooled more strongly.

Further, in the cooling device having the water temperature sensor 22, the oil temperature sensor 23, and the controller 20, when both the working oil temperature and the engine cooling water temperature are lower than the reference set temperature, or the working oil temperature is set to the reference set temperature. When the temperature is higher than the temperature, the controller 20 does not output the louver mechanism opening command signal. Therefore, since the louver plate 16 of the louver mechanism 15 is closed, the cooling effect in this case is the same as in the case of the prior art. However, when the hydraulic oil temperature is lower than the reference set temperature and the engine cooling water temperature is close to or higher than the standard low temperature, the controller 20 outputs a louver mechanism opening command signal to the opening / closing drive actuator 17. To be done. Therefore, as shown in FIG. 3, a part of the external air sucked in from the suction port 4 in the direction of the arrow A flows in the direction of the arrow and flows between the louver plate 16 of the louver mechanism 15 which is opened. Flow through the space 13, the radiator 9 ', the engine room 6', and the discharge port 5. The other part of the outside air flows in the directions of arrow B, C, D, and E and is discharged to the outside. Therefore, when the louver mechanism 15 is opened, the radiator 9'can be cooled more strongly.

Further, in the cooling device of the present invention, the louver mechanism 15 is rotatably attached to the duct plate 14. Therefore, when cleaning the radiator 9 ′, the space 13 inside the duct plate 14 should be opened. You can Therefore, the radiator 9'can be easily cleaned by radiating jet water or pressurized air from the open space 13 side.

[0018]

As described above, according to the present invention, a gap is provided between the facing surfaces of the oil cooler for hydraulic oil and the radiator for engine cooling water, and a duct plate is fixed to a part of the outer periphery of the space. A louver mechanism that can open and close the louver plate is attached to the other part of the outer circumference to enclose the louver mechanism. It was configured to inhale into the space. A water temperature sensor is installed in the engine cooling water circuit system, and an oil temperature sensor is installed in the hydraulic oil circuit system.The water temperature sensor and the oil temperature sensor are connected to the actuator for opening / closing the louver mechanism via the controller. However, the louver mechanism is opened by the command signal from the controller when the hydraulic oil temperature is lower than the reference set temperature and the engine coolant temperature is close to or higher than the reference set temperature. In addition, the louver mechanism is rotatably attached to the duct plate through the pin, and when cleaning the radiator, the louver mechanism is rotated around the pin as a center of rotation so that the space inside the duct plate can be removed. I made it open. Thus, by opening / closing or controlling the opening / closing of the louver mechanism, the flow rate of air passing through the radiator and the air temperature can be changed, and the cooling effect of the radiator and the oil cooler can be changed. Therefore, when the oil cooler side is stable at a low temperature and the radiator is likely to overheat, the louver mechanism can be opened to help cool the radiator side. Also, since the louver mechanism is rotatably attached to the duct plate, when cleaning the radiator, it is easy to open the gap space inside the duct plate and inject jet water or pressurized air. Can be cleaned. Therefore, it is possible to prevent the cooling efficiency from deteriorating due to clogging between the radiator fins and improve the maintainability and serviceability of the cooling device.

[Brief description of drawings]

FIG. 1 is a partially cutaway rear view of a hydraulic excavator having a cooling device according to the present invention.

FIG. 2 is a diagram showing a control circuit for controlling an actuator for opening and closing the louver mechanism of the present invention.

FIG. 3 is a partially cutaway rear view of the hydraulic excavator showing a state in which the louver mechanism of the present invention is opened.

FIG. 4 is a detailed view of a portion A of FIG.

5 is a detailed view of a portion B of FIG.

6 is a diagram showing a state in which the louver mechanism of FIG. 4 is opened.

FIG. 7 is a partial cutaway rear view of a conventional hydraulic excavator.

FIG. 8 is a partially cutaway plan view showing a conventional radiator and oil cooler.

[Explanation of symbols]

 3 Guard Plate 4 Suction Port 5 Discharge Port 6, 6'Engine Room 7 Engine 8 Fan 9,9 'Radiator 10, 10' Oil Cooler 13 Spacing Space 14 Duct Plate 15 Louver Mechanism 17 Opening / Closing Actuator 19 Control Circuit 20 Controller 22 Water temperature sensor 23 Oil temperature sensor 28 pins

Claims (3)

[Scope of utility model registration request] 1. A radiator of a water-cooled engine and an oil cooler for cooling hydraulic oil are provided side by side, and an engine chamber is surrounded by a guard plate, and an inlet for cooling air is provided on one side of the guard plate. In a cooling device in which an exhaust port is provided on the other side, air is sucked in through the intake port by a fan, passes through the fins of the oil cooler, between the fins of the radiator, and through the engine compartment and is exhausted from the exhaust port, A space is provided between the facing surfaces of the radiator, and a part of the outer periphery of the space is surrounded by a fixed duct plate, and the other part of the outer periphery is attached with an openable louver mechanism of the louver plate. A cooling device for a construction machine, wherein when the louver mechanism is opened, a part of the external air is sucked into the gap space through the louver mechanism. 2. The cooling device for a construction machine according to claim 1, wherein the engine cooling water circuit system is provided with a water temperature sensor and the hydraulic oil circuit system is provided with an oil temperature sensor. An oil temperature sensor and an actuator for opening / closing the louver mechanism are connected via a controller, and when the operating oil temperature is lower than the reference set temperature and the engine coolant temperature is close to or higher than the reference set temperature, A cooling device for a construction machine, wherein a louver mechanism is opened by a command signal from the controller. 3. A cooling device for a construction machine according to claim 1 or 2, wherein a louver mechanism is rotatably attached to a duct plate through a pin to clean a radiator. A cooling device for a construction machine, characterized in that a louver mechanism is rotated about the pin as a rotation center to open an interval space inside the duct plate.