JP6451706B2 - hydraulic unit - Google Patents

Description

  The present invention relates to a hydraulic unit that supplies oil to a hydraulic actuator.

  There is known a hydraulic unit that is mounted on a main machine such as a machine tool and supplies high-pressure oil sent from a pump to a hydraulic actuator. 2. Description of the Related Art Conventionally, as a hydraulic unit, there is a unit in which a motor pump having a pump and a motor for driving the pump is fixed, and a tank for storing oil supplied to the pump is disposed below the frame. .

Japanese Patent Laid-Open No. 6-42501

  The conventional hydraulic unit is equipped with an oil cooler (air cooling heat exchanger). For example, drain oil from a pump or oil heated in a machine tool is cooled by the oil cooler and then supplied into the tank. Some are configured to reduce temperature. The oil cooler is arranged behind the motor pump, and is configured to allow the fan wind for cooling the motor in the motor pump to pass through the oil cooler. At this time, since the motor pump is a vibrating body, the motor pump and the oil cooler cannot be arranged in contact with each other. Therefore, the air flowing from between the motor pump and the oil cooler flows into the fan, so that a sufficient amount of air passing through the oil cooler cannot be obtained. Therefore, there is a problem that the oil temperature in the tank cannot be sufficiently lowered due to insufficient cooling performance of the oil cooler.

  Accordingly, an object of the present invention is to provide a hydraulic unit capable of sufficiently lowering the oil temperature in the tank by an oil cooler.

According to a first aspect of the present invention, there is provided a hydraulic unit including a pump that supplies oil stored in a tank to an external device, a motor that drives the pump, and a fan that cools the motor. An air-cooling heat exchanger that opposes the opening surface in which the opening is formed and cools the oil, and between the opening surface of the motor pump and the air-cooling heat exchanger, on the outer peripheral side of the opening An annular seal member that contacts the opening surface and the air-cooling heat exchanger is disposed , and the air passage area on the air-cooling heat exchanger side in the sealing member is larger than the air passage area on the opening surface side. And

  In this hydraulic unit, the seal member is disposed between the opening surface of the motor pump and the air cooling heat exchanger, so that wind does not flow from between the opening surface of the motor pump and the air cooling heat exchanger. Therefore, a sufficient amount of air passing through the air-cooled heat exchanger can be obtained. Therefore, the oil temperature in the tank can be sufficiently lowered by improving the cooling performance of the air-cooled heat exchanger.

  In this hydraulic unit, heat cannot be exchanged in the air-cooled heat exchanger where the seal member contacts because the wind does not pass through, but the air passage area on the end surface on the air-cooled heat exchanger side is the air on the end surface on the opening side of the motor pump. Since it is larger than the passage area, it is possible to prevent the area of the portion through which the wind passes in the air-cooled heat exchanger from being reduced.

A hydraulic unit according to a second aspect of the invention is the hydraulic unit according to the first aspect of the invention, wherein the seal member has a closed cell structure.

  In this hydraulic unit, since the sealing member has a closed cell structure, wind can be effectively prevented from flowing between the motor pump and the air-cooled heat exchanger.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, the seal member is disposed between the opening surface of the motor pump and the air-cooling heat exchanger, so that no wind flows from between the opening surface of the motor pump and the air-cooling heat exchanger. Therefore, a sufficient amount of air passing through the air-cooled heat exchanger can be obtained. Therefore, the oil temperature in the tank can be sufficiently lowered by improving the cooling performance of the air-cooled heat exchanger.

In the first aspect of the invention, heat cannot be exchanged in the air-cooled heat exchanger where the seal member contacts because the wind does not pass through, but the air passage area of the end surface on the air-cooled heat exchanger side is equal to that of the end surface on the opening side of the motor pump. Since it is larger than the air passage area, it is possible to prevent the area of the portion through which the wind passes in the air-cooled heat exchanger from being reduced.

In the second invention, since the seal member has a closed cell structure, it is possible to effectively prevent wind from flowing between the motor pump and the air-cooled heat exchanger.

It is a front view, a top view, and a side view of a hydraulic unit according to an embodiment of the present invention. It is the front view, top view, and side view of the motor pump of FIG. It is the top view and sectional drawing of the sealing member of FIG. It is a top view and a sectional view of a seal member of a hydraulic unit concerning a modification of the present invention.

  Hereinafter, a hydraulic unit 1 according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the hydraulic unit 1 of the present embodiment includes a motor pump 4 having a pump 2 that supplies oil to an external device such as a machine tool and a motor 3 that drives the pump 2. The gantry 5 and a tank 6 that is disposed below the gantry 5 and stores oil supplied to the pump 2 are provided. Therefore, the hydraulic unit 1 drives the pump 2 to supply the oil stored in the tank 6 to an external device such as a machine tool.

  In the motor pump 4, a plurality of fins 3 a are formed on the outer peripheral surface of the motor 3, and a fan 7 that cools the motor 3 is disposed behind the motor 3. Therefore, when the motor 3 is being driven, it is possible to prevent the motor 3 from becoming high temperature by supplying wind to the fins 3a by the fan 7.

  An opening surface 8 in which a plurality of openings 8 a are formed is formed on the end surface (left end surface in FIG. 1) of the motor pump 4, and the opening surface 8 faces the fan 7. Therefore, in the motor pump 4, when the fan 7 is rotationally driven, wind flows from the opening surface 8 toward the fan 7.

  On the gantry 5, an oil cooler 10 (air cooling heat exchanger) facing the opening surface 8 of the motor pump 4 is arranged on the left side of the motor pump 4. The oil cooler 10 is connected to the pump 2 by a drain pipe 11a and is connected to the tank 6 by a tank pipe 11b. Therefore, the drain oil of the pump 2 is supplied to the oil cooler 10 through the drain pipe 11a. Thereafter, the oil flows in the oil cooler 10 and is cooled by the wind of the fan 7, and then passes through the tank pipe 11 b and flows into the tank 6.

  Between the opening surface 8 of the motor pump 4 and the oil cooler 10, a seal member 12 that contacts the opening surface 8 and the oil cooler 10 is disposed on the outer peripheral side of the opening 8a. The seal member 12 has a closed cell structure and is configured in an annular shape. The seal member 12 has a substantially rectangular cross section over the entire circumference and is formed to have the same thickness.

  In the present embodiment, in the seal member 12, the air passage area on the oil cooler 10 side (the air passage area on the left end surface in FIG. 3B) is the air passage area on the opening surface 8 side (the right end in FIG. 3B). Surface air passage area). Accordingly, since the wind does not flow from between the opening surface 8 of the motor pump 4 and the oil cooler 10, the wind that has passed through the inside of the seal member 12 flows toward the fan 7 after passing through the oil cooler 10.

<Characteristics of hydraulic unit of this embodiment>
The hydraulic unit 1 of the present embodiment has the following features.

  In the hydraulic unit 1 according to the present embodiment, the seal member 12 is disposed between the opening surface 8 of the motor pump 4 and the oil cooler 10, so that air flows between the opening surface 8 of the motor pump 4 and the oil cooler 10. Will not flow. Therefore, a sufficient amount of air passing through the oil cooler 10 can be obtained. Therefore, by improving the cooling performance of the oil cooler 10, the oil temperature in the tank 6 can be sufficiently lowered.

  In the hydraulic unit 1 of this embodiment, since the seal member 12 has a closed cell structure, it is possible to effectively prevent wind from flowing between the opening surface 8 of the motor pump 4 and the oil cooler 10.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims. It is.

  In the above embodiment, the case where the seal member 12 has the closed cell structure has been described. However, the seal member of the present invention may not have the closed cell structure.

  In the above-described embodiment, the case where the seal member 12 has an annular shape has been described. However, the seal member of the present invention is not limited to an annular shape, and may be an annular shape.

  In the above-described embodiment, the case where the seal member 12 has a substantially rectangular cross section over the entire circumference has been described. However, as shown in FIG. 4B, in the seal member 12, the air passage on the oil cooler 10 side passes. The area (the air passage area on the left end face in FIG. 4B) may be larger than the air passage area on the opening face 8 side (the air passage area on the right end face in FIG. 4B). In this case, the portion of the oil cooler 10 that is in contact with the seal member 12 cannot exchange heat because the wind does not pass through it. However, since the air passage area on the oil cooler 10 side is larger than the air passage area on the opening surface 8 side, the oil cooler 10 can prevent the area of the portion through which the wind passes from becoming small.

DESCRIPTION OF SYMBOLS 1 Hydraulic unit 2 Pump 3 Motor 4 Motor pump 6 Tank 7 Fan 8 Opening surface 8a Opening 10 Oil cooler (air cooling heat exchanger)
12 Seal member

Claims (2)

A pump for supplying oil stored in a tank to an external device, a motor for driving the pump, and a fan for cooling the motor;
An air-cooling heat exchanger that opposes the opening surface in which the opening is formed in the motor pump and cools the oil;
Between the opening surface of the motor pump and the air-cooling heat exchanger, an annular seal member that contacts the opening surface and the air-cooling heat exchanger is disposed on the outer peripheral side of the opening ,
In the sealing member, the air passage area on the air-cooling heat exchanger side is larger than the air passage area on the opening surface side . The hydraulic unit according to claim 1, wherein the seal member has a closed cell structure.

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