KR101331160B1 - Cooling device of forklift truck - Google Patents

Abstract

The present invention relates to a cooling device of a forklift truck. The present invention includes an air-cooled cooler provided in an engine room, a storage tank in which oil is stored, and a tube connecting the air-cooled cooler to one of the driving parts driven by the pressure of the oil to enable circulation of the oil. In the forklift cooling device comprising: an auxiliary cooler for cooling the oil, the auxiliary cooler, a cooling tank installed so that a portion of the tube passes through the inside, and stored in the cooling tank inside the cooling tank Characterized in that it comprises a refrigerant for cooling the oil via the. Therefore, the cooling function of the hydraulic oil can be further improved by the oil-cooled subcooler, and thus, by sufficiently cooling the hydraulic oil, it is possible to prevent deterioration of the seals and components in the hydraulic system by the temperature rise of the hydraulic oil. By using the fuel tank provided in the forklift truck instead of separately manufacturing the cooling tank used for the subcooler, it is possible to reduce the manufacturing cost by reducing the number of parts and there is no need to prepare a separate installation space.

Description

Cooling device of forklift {COOLING DEVICE OF FORKLIFT TRUCK}

1 is a configuration diagram showing a cooling device of a forklift according to the prior art.

Figure 2 is a block diagram showing a cooling device of the forklift according to the invention.

Figure 3 is a perspective view showing one embodiment of the subcooler in the cooling device of the forklift according to the invention.

♣ Explanation of symbols for the main parts of the drawing ♣

11: transmission 12: tube

13: air cooled water cooler 14: radiator

15: Blower fan 16: Oil-cooled subcooler

16a: cooling tank 16b: refrigerant

17: body frame 17a: fuel tank

The present invention relates to a forklift cooling device, and more particularly, to a forklift cooling device for cooling various oils used for driving and lubricating the forklift.

In general, the forklift is configured to operate various actuators such as hydraulic cylinders by using oil, and to lubricate the transmissions and the like.

These oils are heated by the hot heat generated by friction, compression and expansion when driving the forklift. When the temperature of the oil is raised in this way, the seals and parts in the hydraulic system deteriorate and the viscosity of the oil changes. In particular, the change in the oil viscosity causes wear of the driving parts, reducing the durability of the vehicle and shortening the oil change cycle. In order to prevent these problems, the forklift is equipped with a cooling device for cooling a high temperature working oil.

1 illustrates an example of a cooling water and a lubricating oil cooling device of a transmission among conventional cooling devices. As shown in FIG. 1, a high temperature working oil discharged from the transmission 11 is cooled through a tube 12 constituting a cooling net environment path. It is configured to circulate back to the actuator 11 via the inside of the cooler 13 provided on the circulation path, and is configured to cool the working oil in the process of passing through the cooler 13.

In addition, the cooler 13 is disposed on one side of the radiator 14 for cooling the coolant of the engine, and is configured to cool the working oil in an air-cooled manner in which heat is exchanged by the air flow by the blower fan 5. The tube 12 passing through the inside is formed in a zigzag shape to increase the cooling time by extending the time for the hydraulic oil to flow in the cooler 13 and at the same time increasing the heat exchange area.

By the way, in the above-mentioned conventional cooling device, the cooling fan of the radiator 14 which cools hydraulic fluid is air-cooled by the cooler 13, and also cools the cooling water of an engine flow chart of air for improving cooling efficiency. Indirectly using the flow of air by) has a disadvantage of low cooling efficiency. This makes it impossible to cool the fluid sufficiently, so if the equipment is run for a long time, the temperature of the fluid will rise gradually. This temperature rise of oil degrades the seals and components in the hydraulic system or changes the oil viscosity. In particular, when the viscosity of the lubricating oil is changed, there is a problem that excessive maintenance costs are required, such as shortening of parts and shortening of the oil replacement cycle.

Accordingly, the present invention has been made to solve the conventional problems as described above, the object is that the sealing oil and components in the hydraulic system is deteriorated by the temperature increase of the hydraulic fluid by cooling the hydraulic fluid sufficiently, or the viscosity of the oil is changed It is to provide a forklift cooling device that can be prevented.

In order to achieve the above object, the present invention provides an air-cooled cooler provided in an engine room, a storage tank in which oil is stored, and a drive part driven by the pressure of the oil, thereby allowing the air-cooled cooler to be circulated. A forklift cooling device having a tube for connecting to each other, comprising: a subcooler for cooling the oil, wherein the subcooler includes a cooling tank installed so that a portion of the tube passes through the inside, and the cooling tank. It is characterized in that it comprises a refrigerant stored in the cooling the oil via the inside of the cooling tank.

Preferably, the forklift includes a body frame in which any one of the LPG engine and the diesel engine can be selectively mounted, and when the LPG engine is mounted on the body frame, the cooling tank of the subcooler includes: Characterized in that disposed in the fuel tank provided in the vehicle body frame so that the diesel oil to be used when mounting the diesel engine.

And the refrigerant stored in the cooling tank of the subcooler is characterized in that the operating oil used as a power source of the drive component.

Hereinafter, a preferred embodiment of the forklift cooling apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a configuration diagram showing an example of a lubricating oil cooling device for a transmission among the cooling devices according to an embodiment of the present invention. As shown, the lubricating oil used in the transmission 11 forms a cooling net environment path. It is circulated through, and the air cooling cooler 13 and the auxiliary cooler 16 is provided on the cooling pure environment path so that the tube 12 passes through the inside.

The air-cooled cooler 13 is disposed on one side of the radiator 14 for cooling the cooling water of the engine, to cool the working oil by heat exchange with air by the blower fan 15 of the radiator 14, The tube 12 in the cooler 13 is formed in a zigzag shape to increase the cooling time by extending the time for the hydraulic oil to flow in the air-cooled cooler 13 and increasing the heat exchange area.

The subcooler 16 includes a cooling tank 16a through which the tube 12 passes through and a refrigerant 16b filled in the cooling tank 16a.

The tube 12 in the cooling tank 16a is preferably configured in a zigzag shape to increase cooling time by extending the time for the hydraulic oil to flow in the subcooler 16 and at the same time increasing the heat exchange area.

The subcooler 16 is preferably arranged downstream of the cooling circulation direction with respect to the air-cooled cooler 13 so that the working oil cooled via the air-cooled cooler 13 is cooled again, or not shown, but the air-cooled cooler is not shown. It may be arranged so as to be arranged on the upstream side in the cooling circulation direction with respect to (13), and then the hydraulic oil is first cooled by the subcooler 16 and then cooled by the air-cooled cooler 13 again.

On the other hand, as the refrigerant 16b of the subcooler 16, various fluids may be used, but it is preferable to use a fluid that does not cause corrosion even when used for a long time. In this embodiment, hydraulic oil which can be easily obtained is used.

According to such an auxiliary cooler 16, the cooling function of the working oil is improved and the temperature of the working oil can be sufficiently lowered, so that the seals and parts in the hydraulic system are deteriorated by heat conducted from the lubricating oil, or the viscosity of the lubricating oil due to the high temperature of the lubricating oil. Changes can be prevented.

On the other hand, Figure 3 is a perspective view showing an embodiment of the subcooler in the cooling device of the forklift according to the present invention, the fuel tank provided in the body frame 17 of the forklift as a cooling tank (16a) of the subcooler (16) The tube 12 penetrates and passes through this fuel tank 17a using 17a).

In general, a forklift is a driving source, and a type using light oil as fuel and a type using LPG as fuel, and these diesel forklifts and LPG forklifts share a body frame 17. By the way, the fuel tank 17a for the diesel forklift is formed in the body frame 17. In the case of the LPG forklift, the fuel tank 17a formed in the body frame 17 is not used.

Accordingly, the auxiliary cooler 16 can be simply configured by allowing the tube 12 to pass through the unused fuel tank 17a and filling it with the refrigerant 16b. Thus, the body frame of the forklift truck is thus constructed. By using the fuel tank 17a, which is already provided at 17, as the cooling tank 16a of the subcooler 16, it is possible to reduce the number of parts and to reduce the manufacturing cost, and does not need to provide a separate installation space. do.

In addition, since the refrigerant 16b is filled in the empty fuel tank 17a, the left and right balances of the body frame 17 are balanced. And since the separate cooling tank (16a) does not need to be installed in the body frame 17, there is no need for a separate installation space for the installation of the cooling tank (16a), thereby increasing the space utilization of the body frame (17) Can be.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

As described above, according to the cooling device of the forklift according to the present invention, the cooling function of the hydraulic fluid is further improved by providing an auxiliary cooler in addition to an air-cooled cooler on the cooling net environment path of the hydraulic oil for operating the actuator. The cooling tank is sufficiently cooled to prevent deterioration of the seals and components in the hydraulic system due to the rise of the temperature of the working oil, and the fuel tank provided in the body frame of the forklift truck is not manufactured separately. By using it, there is no need to prepare a separate installation space, and the number of parts is reduced, which has the effect of reducing the manufacturing cost.

Claims (3)

delete An air cooling condenser 13 provided in an engine room, a storage tank in which oil is stored, and a tube connecting the air cooling condenser 13 to one of driving components driven by the pressure of the oil to enable circulation of the oil. In the forklift cooling device provided with (12), A subcooler 16 for cooling the oil, The subcooler 16 includes a cooling tank 16a installed so that a portion of the tube 12 passes through the inside, and the oil stored in the cooling tank 16a and passing through the inside of the cooling tank 16a. It includes a refrigerant for cooling, The forklift has a body frame 17 which can be selectively mounted on any one of an LPG engine and a diesel engine, The body frame 17 includes a fuel tank for storing diesel oil used as fuel of the engine when the diesel engine is mounted, The cooling tank 16a is the fuel tank which is left as an empty space when the LPG engine is mounted on the body frame 17, and the refrigerant is stored in the fuel tank. . 3. The method of claim 2, Cooling device of the forklift, characterized in that the refrigerant stored in the cooling tank (16a) of the subcooler (16) is a working oil used as a power source of the drive component.

Images