JP2000249111A - Oil cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and low-cost oil cooling device by providing an air blower relative to a radiator provided in an oil circuit. SOLUTION: A radiator 27 is provided in a suction side of a fan 31 as an air blower covered with a ventilation cover 32, the fan 31, the ventilation cover 32, and an electric motor 34 constitute a fan unit 35, and this is freely detachable/attachable in a connecting part 36 of the radiator 27. The temperature of the operating fluid is increased by controlling the direction of operating fluid discharged from a hydraulic pump 14 by a switch valve 18 and operating the hydraulic actuator 22 so that the fresh cooling air is fed through ventilation clearance of the radiator 27 by the suction force of the fan 31 rotated by the electric motor 34 to cool the radiator 27. On the other hand, the operating fluid returning to a tank 12 from the switch valve 18 via the radiator 17 radiates the heat in the fluid by the radiator 27 so that the operating fluid can hold a constant temperature in a range 60-70 deg.C and suppress the temperature rise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil cooling device using air cooling.

[0002]

2. Description of the Related Art In a hydraulic circuit used in conventional machine equipment such as a machine tool, even if the temperature of the hydraulic oil increases, the hydraulic oil is not particularly cooled.

Therefore, when the hydraulic oil temperature rises excessively, the hydraulic oil must be naturally radiated until the oil temperature falls to a predetermined value, and the hydraulic equipment must be stopped.

[0004] On the other hand, in a hydraulic circuit used in a construction machine or the like, the operating oil is forcibly cooled by an oil cooler because the oil temperature of the operating oil rises remarkably. As this oil cooler, a multi-tube oil cooler using water cooling is known.

[0005]

The oil cooler used in this construction machine and the like exhibits a high-performance cooling effect in a hydraulic circuit that applies a large load to a hydraulic actuator, but is an expensive oil cooling device. However, there is a problem that it is not suitable for a hydraulic circuit used in machine equipment such as a machine tool and in which the temperature of hydraulic oil rises slowly.

The present invention has been made in view of the above points, and has as its object to provide a simple and inexpensive oil cooling device.

[0007]

According to a first aspect of the present invention, there is provided an oil having a hydraulic circuit, a radiator provided in the hydraulic circuit, and a blower provided for the radiator. It is a cooling device.

[0008] The operating oil whose temperature is to be raised by the operation of the hydraulic circuit is deprived of heat by a radiator that is air-cooled by a blower, and the temperature rise is suppressed at a constant temperature.

According to a second aspect of the present invention, the radiator and the blower in the oil cooling device according to the first aspect use a radiator and a fan for a vehicle.

[0010] An oil cooling device is manufactured by effectively using a radiator and a fan for a vehicle.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIG.

First, the hydraulic circuit 11 will be described.
The suction-side strainer 15 of the hydraulic pump 14 driven by the electric motor 13 is inserted into the
Is provided with a relief valve 17 for setting a pressure, and further connected to an oil supply port of an electromagnetic switching valve 18.

One output port of the switching valve 18 is connected to a pipe line.
21 communicates with one port of a hydraulic actuator 22, and the other output port of the switching valve 18 communicates with the other port of the hydraulic actuator 22 through a conduit 25 in which a speed controller 23 and a check valve 24 are interposed. ing.

The oil discharge port of the switching valve 18 is connected to an inlet 28 provided at one end of a radiator 27 as a radiator through a pipe 26, and is provided at the other end of the radiator 27. An outlet 29 is communicated with the inside of the tank 12 by a pipe 30.

On one side of the radiator 27, a fan 31 as a blower is arranged. The fan 31 is covered with a ventilation cover 32, and its fan rotating shaft 33 is driven to rotate by an electric motor 34. The radiator 27 is positioned on the suction side of the fan 31.

The radiator 27 and the fan 31 are
For example, a radiator and a fan for a vehicle used for a scrapped car or the like are reused.

Further, the fan 31, the ventilation cover 32 and the electric motor 34 are constructed as one fan unit 35, and the radiator 27 can be easily cleaned by detachably attaching the fan unit 35 to the connection portion 36 of the radiator 27. It can be so.

In such a hydraulic circuit, the two-position switching operation of the switching valve 18 by an on / off signal enables
Hydraulic oil discharged from the hydraulic pump 14 is supplied to one port of a hydraulic actuator 22,
The hydraulic oil discharged from the other port of 22 is returned to the tank 12 via the switching valve 18 and the radiator 27.

The hydraulic actuator 22 operates linearly in the case of the illustrated hydraulic cylinder, and rotates in the case of the hydraulic motor (not illustrated). Further, in the case of a hydraulic cylinder, when the piston rod 22a operates in the contraction direction, the hydraulic oil whose flow rate is not restricted is supplied from the switching valve 18 to the check valve.
Since it is supplied to the rod side of the hydraulic cylinder via 24,
When the contracting operation is performed at a high speed and the piston rod 22a of the hydraulic cylinder operates in the extending direction, the hydraulic oil discharged from the rod side of the hydraulic cylinder is limited in flow rate by the variable throttle of the speed controller 23, so The operating speed is limited to the set speed.

As the hydraulic oil discharged from the hydraulic pump 14 is directionally controlled by the switching valve 18 to operate the hydraulic actuator 22, the temperature of the hydraulic oil rises.

Then, the fan 31 is rotated by the electric motor 34 and air is sucked through the ventilation gap of the radiator 27 by the suction force of the fan 31 so that the radiator 27
The cooling air is always supplied to the radiator 27 and the radiator 27 is cooled by the air.

On the other hand, the hydraulic oil returning from the switching valve 18 to the tank 12 via the radiator 27 transfers heat in the oil to the radiator.
The hydraulic oil radiated by the radiator 27 and deprived of the heat by the radiator 27 is prevented from rising at a constant temperature of about 60 to 70 ° C.

The cooling efficiency of the radiator 27 is reduced if dust or the like adheres to its surface or the like.
If the dust or the like reaches the limit, remove the radiator 27 and fan unit 35, and disassemble the radiator 27 and fan unit 35. Then, maintenance of the radiator 27 can be simplified by cleaning and removing dust and the like from the surface and the ventilation gap of the radiator 27 using, for example, an air jet ejected from an air nozzle.

[0024]

According to the first aspect of the present invention, it is possible to provide a simple and inexpensive air-cooled oil cooling device using a radiator and a blower, and to increase the oil temperature used in machine equipment such as machine tools. Suitable for moderate hydraulic circuit. Further, the oil cooling device using the radiator and the blower has a simple structure and can easily perform maintenance such as cleaning.

According to the second aspect of the present invention, the radiator and the fan that make effective use of the radiator and the fan for the vehicle can further reduce the cost and facilitate the maintenance.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram showing an embodiment of an oil cooling device according to the present invention.

[Explanation of symbols]

 11 Hydraulic circuit 27 Radiator as radiator 31 Fan as blower

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Motomi Takagi 4- 10-1, Yoga, Setagaya-ku, Tokyo New Caterpillar Mitsubishi Corporation F-term (reference) 3H082 AA06 CC02 DB09 DB38

Claims (2)

[Claims] An oil cooling device comprising: a hydraulic circuit; a radiator provided in the hydraulic circuit; and a blower provided for the radiator. 2. The oil cooling device according to claim 1, wherein the radiator and the blower use a radiator and a fan for a vehicle.