TW201321614A - Hydraulic unit - Google Patents

Abstract

The present invention reliably cools a power conversion component. The hydraulic unit (10) is provided with: an oil tank (20) for retaining the oil (11); an oil pump (30) for circulating the oil (11) between the oil tank (20) and an object; and a power converter (42) that controls the driving of the oil pump (30). The power converter (42) is installed in the oil tank (20). Meanwhile, a heat-radiating unit (46), which is for the power conversion component (44) of the power converter (42), is configured in the oil tank (20) facing an oil flow area (2b) where the oil (11) flows inside the oil tank (20).

Description

Oil pressure unit

The present invention relates to a hydraulic unit, and more particularly to a heat dissipation measure for driving and controlling a power conversion element of an oil pump.

Heretofore, as disclosed in Patent Document 1, the hydraulic unit that supplies the cooling oil includes a fuel tank and an oil pump. The oil pressure unit includes an electric cooling fan that cools an electric motor of the oil pump. The above-described hydraulic unit further includes a control box for the motor in which an electronic device (power conversion element) for controlling the motor is mounted. Since the electronic device generates heat, the control box is disposed at a position in the wind blowing direction of the electric cooling fan, and the air flow generated by the electric cooling fan suppresses an increase in the internal temperature of the control box.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2008-8252

However, the conventional hydraulic unit employs an air cooling method in which an air flow of an electric cooling fan is used to cool an electronic device, that is, a power conversion element. Therefore, there is a problem that the overall size of the device is increased. That is to say, it is necessary to provide not only a cooling fan in the conventional hydraulic unit but also a space for ensuring air flow in the conventional hydraulic unit, thereby causing the hydraulic unit to be enlarged.

Because if a heat sink is provided, outdoor air will be introduced into the heat sink. Therefore, there is a problem that dust is easily accumulated between the heat sinks and the cooling efficiency is lowered.

The present invention has been accomplished in view of the above problems. The purpose is to reliably cool the power conversion element.

The present invention releases heat from the power conversion element to the oil in the fuel tank.

In the first aspect of the invention, there is provided a fuel tank (20) for storing oil (11), an oil pump (30) for circulating oil (11) between the oil tank (20) and the object, and driving and controlling the oil pump. (30) Power converter (42). Further, in the invention of the first aspect, the power converter (42) is mounted on the oil tank (20), and on the other hand, the oil tank (20) flows in the oil tank (20) toward the oil (11). The oil flow portion (2b) constitutes a heat radiating portion (46) of the power conversion element (44) of the power converter (42).

In the above-described first aspect of the invention, the power conversion element (44) of the power converter (42) generates heat. The heat of the power conversion element (44) is released from the heat dissipating portion (46) to the oil (11). The power conversion element (44) is cooled by the heat dissipation.

In the second aspect of the invention, in the invention of the first aspect, the oil tank (20) is provided with a oil return port (25) and a fuel injection port (26). The heat radiating portion (46) is disposed closer to the fuel injection port (26) than the oil return port (25).

According to the second aspect of the invention, it is possible to suppress the high temperature oil (11) returning to the fuel tank (20) from directly flowing into the heat radiating portion (46).

The third aspect of the invention is such that in the invention of the first or second aspect, An obstruction plate (27) is provided at a position closer to the upstream side of the oil flow portion (2b) of the oil tank (20) than the heat dissipation portion (46).

According to the third aspect of the invention, the high temperature oil (11) is prevented from flowing into the heat radiating portion (46) by the obstruction plate (27), and the oil (11) is agitated.

In the fourth aspect of the invention, in the invention of any of the first to third aspects, the rib (2a) is provided on the wall (24) of the oil tank (20).

According to the invention of the fourth aspect, the heat of the power conversion element (44) is released from the heat radiating portion (46) to the oil (11), and the heat of the oil (11) passes through the ribs on the wall (24) of the casing (21). (2a) Release to outdoor air.

In the fifth aspect of the invention, in the invention of any of the first to fourth aspects, the control box (40) for charging the power converter (42) and the oil pump (30) are integrally formed. A drive control unit (12) is disposed, the drive control unit (12) is housed in the oil tank (20), and a wiring connecting the power converter (42) and the oil pump (30) is formed in the drive control unit (12). Wiring path (4d).

In the fifth aspect of the invention, the wiring (4d) is provided with wiring for connecting the power converter (42) and the oil pump (30).

In the sixth aspect of the invention, in the invention of any of the first to fifth aspects, the power conversion element (44) in the power converter (42) is attached to the wall of the fuel tank (20) (24). ) Settings.

According to the sixth aspect of the invention, the heat of the power conversion element (44) is transmitted to the wall (24) of the oil tank (20) to dissipate heat to the oil (11).

According to a seventh aspect of the invention, in the invention of any of the first to sixth aspects, the oil tank (20) is a hydraulic oil tank of an injection molding machine.

According to the seventh aspect of the invention, the heat of the power conversion element (44) is released to the hydraulic oil of the injection molding machine. In other words, in order to maintain the precision of the molded article, the hydraulic oil of the above injection molding machine is generally managed at about 40 ° C, and therefore it is effective for cooling the power conversion element (44).

According to the present invention, since the heat radiating portion (46) of the power conversion element (44) faces the oil flow portion (2b), the heat of the power conversion element (44) can be released to the oil (11), and the whole can be achieved. Miniaturization. In other words, since it is not necessary to provide a fan as in the prior art, and it is not necessary to secure a flow space of the cooling air, the present embodiment can be downsized.

Since it is not necessary to provide a heat sink that is in contact with the outdoor air as in the prior art, the dust does not accumulate, and the cooling performance can be suppressed from being lowered.

Since the heat radiating portion (46) of the power conversion element (44) faces the oil flow portion (2b), it is possible to reliably dissipate heat from the flowing oil (11).

According to the second aspect of the invention, since the heat radiating portion (46) is disposed closer to the fuel injection port (26) than the oil return port (25), it is possible to suppress the high temperature oil returning to the oil tank (20) ( 11) Directly flow into the heat sink (46).

According to the third aspect of the invention, since the obstruction plate (27) is provided in the oil tank (20), the oil (11) can flow away from the obstruction plate (27), and the high-temperature oil (11) can be suppressed from flowing into the heat dissipation. Department (46). Moreover, since the oil (11) is agitated, the heat transfer efficiency to the surroundings is improved. Further, it is possible to suppress the massive precipitate from being piled up in the vicinity of the heat radiating portion (46), thereby preventing the heat radiation effect from being lowered.

According to the invention of the fourth aspect described above, since it is formed on the above tank (20) The ribs (2a) allow the heat absorbed by the oil (11) to be reliably released to the outdoor air.

According to the fifth aspect of the invention, since the wiring path (4d) is provided with wiring for connecting the power converter (42) and the oil pump (30), the main circuit of the oil pump (30) is used by the motor housing (37). The casing is shielded. Therefore, it is possible to improve the electromagnetic standing (EMC). Further, since the wiring is internal wiring, it is not necessary to use a double-covered electric wire, and the length of the wiring can be shortened. Since the electric wire coating layer does not need to have oil resistance, cost reduction can be achieved.

According to the sixth aspect of the invention, the heat of the power conversion element (44) can be released to the oil (11) via the wall (24) of the tank (20).

According to the seventh aspect of the invention, since the oil (11) of the injection molding machine is dissipated, the heat dissipation of the power conversion element (44) can be reliably performed. In other words, since the oil (11) of the injection molding machine is maintained at a predetermined temperature, heat dissipation of the power conversion element (44) can be reliably performed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Embodiment 1 of the invention>

As shown in FIGS. 1 to 4, the hydraulic unit (10) of the present embodiment includes a fuel tank (20). For example, in the oil tank (20), the hydraulic oil of the injection molding machine is stored as the oil (11), and the oil (11) in the oil tank (20) is sent out to drive the actuator (ejection cylinder) of the injection molding machine.

The hydraulic unit (10) is provided with the above-mentioned fuel tank (20) and drive control for sending oil Department (12). The drive control unit (12) includes an oil pump (30) and a control box (40). 3 and 4 schematically show the hydraulic unit (10), and the oil pump (30) is omitted.

The fuel tank (20) is a storage tank (11), and includes a rectangular parallelepiped or a rectangular parallelepiped casing (21) having an upper opening, and a lid body that covers the upper opening of the casing (21). However, the casing is not shown. . The casing (21) includes a bottom plate (23) constituting a bottom surface, and four side walls (24) of the four sides of the bottom plate (23). Further, although not shown, a oil return port and a fuel injection port are formed in the lid of the oil tank (20) in order to flow in and out of the oil (11). The oil return port is configured to flow into the oil (11) returned from the actuator of the injection molding machine, and the fuel injection port is configured to flow out the oil (11) to the actuator of the injection molding machine.

In the drive control unit (12), the oil pump (30) and the control box (40) are integrally formed and housed in the oil tank (20). The oil pump (30) includes a pump body (31) and an electric motor (32). The pump body (31) is constituted, for example, by a gear pump and is disposed above the motor (32). The motor (32) includes a drive shaft (33), a rotor (not shown) and a stator, and the drive shaft (33) is coupled to the pump body (31). Further, the pump casing (36) of the pump body (31) and the motor casing (37) of the motor (32) are integrally fixed.

The control box (40) includes a rectangular parallelepiped or rectangular box body (41) and a power converter (42) housed in the casing (41). The casing (41) is integrally formed with the casing (21) of the oil tank (20), and the casing (41) is recessed inward from a side wall (24) of the casing (21). The opening of the casing (41) on the side wall (24) of the casing (21) is covered by the cover (4a). On the back side of the above control box (40) The motor housing (37) is connected to the pump housing (36) on the side, that is, on the outer side of the back panel (4b) opposite to the cover (4a).

The power converter (42) includes a substrate (43), a power conversion element (44) mounted on the substrate (43), and an electrical component (45) such as a capacitor mounted on the substrate (43). The power converter (42) drives and controls the oil pump (30), and includes, for example, a DC-AC conversion circuit. The power converter (42) is configured to control the number of revolutions of the motor (32).

The power conversion element (44) of the power converter (42) is disposed on the inner surface of the back panel (4b) of the control box (40), and the power converter (42) is configured to be generated by the power conversion element (44). The heat is transferred to the back panel (4b) of the control box (40). The back panel (4b) of the control box (40) is mainly a contact portion that is in contact with the power conversion element (44), and constitutes a heat dissipation portion (46) of the power conversion element (44).

A plurality of ribs (2a) are formed on the inner and outer surfaces of the four side walls (24) of the casing (21), and a plurality of ribs (3a) are formed on the outer surface of the motor casing (37). The ribs (2a, 3a) extend in the up and down direction, and the ribs (3a) on the motor (32) are configured to release heat generated by the motor (32) to the oil (11) on the inner surface of the casing (21). The rib (2a) is configured to transfer heat of the oil (11), and the rib (2a) on the outer surface of the casing (21) is configured to release heat of the oil (11) to the outdoor air.

The inside of the hydraulic unit (10) is configured such that oil returning from the oil return port flows inside the oil tank (20), is sucked into the oil pump (30), and then flows into the oil flow portion (2b) of the fuel injection port. A predetermined space is formed between the motor casing (37) of the oil pump (30) and the back panel (4b) of the control box (40) in the oil flow portion (2b). The oil passage (2c) which flows into the suction port of the pump body (31) from the bottom of the oil tank (20) is formed by the predetermined interval. Further, the oil tank (20) is configured such that the heat radiating portion (46) faces the oil flowing portion (2b). That is, the fuel tank (20) is configured such that the heat radiating portion (46) faces the oil passage (2c), and the heat converting portion (4) of the power conversion element (44) is radiated from the rear plate (4b) of the control box (40) (46). Release the oil (11).

-effect-

Next, the action of the above-described hydraulic unit (10) will be described.

When the oil (11) is stored in the above tank (20) and the motor (32) is driven to drive the pump body (31), the oil (11) in the oil tank (20) flows through the injection body (31). The mouth is supplied to, for example, an actuator of an injection molding machine. The oil (11) is returned to the fuel tank (20) from the actuator through the oil return port.

In the fuel tank (20), the oil (11) returned from the oil return port flows into the oil flow portion (2b), and is sucked into the pump body (31) from the oil passage (2c). The oil (11) of the hydraulic unit (10) repeats this operation.

On the other hand, the motor (32) is controlled by the power converter (42). The power conversion element (44) of the power converter (42) generates heat, but the heat of the power conversion element (44) is transmitted to the back panel (4b) of the control box (40), and is released from the heat dissipation portion (46). (11). The power conversion element (44) is cooled by the heat dissipation.

The motor (32) generates heat during driving, but the heat of the motor (32) is also released to the oil (11) via the ribs (3a) on the motor housing (37). Moreover, the heat of the above oil (11) is released to the outdoor air via the ribs (2a) on the side wall (24) of the casing (21).

- Effect of Embodiment 1 -

As described above, in the present embodiment, the power conversion element (44) is configured such that the heat radiation unit (46) is formed by the control box (40), and the heat radiation unit (46) faces the oil flow unit (2b). The heat of the component (44) is released to the oil (11). As a result, the overall miniaturization can be achieved. In other words, it is not necessary to provide a fan as in the prior art, and it is not necessary to secure a flow space for the cooling air. Therefore, the present embodiment can be downsized.

Since it is not necessary to provide a heat sink that is in contact with the outdoor air as in the prior art, the dust does not accumulate, and the cooling performance can be suppressed from being lowered.

Since the heat radiating portion (46) of the power conversion element (44) faces the oil flow portion (2b), it is possible to reliably dissipate heat to the flowing oil (11).

In particular, since the heat radiating portion (46) of the power conversion element (44) faces the oil passage (2c) through which the oil (11) sucked by the oil pump (30) flows, heat can be dissipated more reliably.

Since the rib (2a) is formed on the above oil tank (20), the heat absorbed by the oil (11) can be reliably released to the outdoor air.

Since the oil (11) of the injection molding machine is dissipated, the heat dissipation of the power conversion element (44) can be reliably performed. In other words, since the oil (11) of the injection molding machine can be maintained at a predetermined temperature such as 40 ° C, heat dissipation of the power conversion element (44) can be reliably performed.

<Embodiment 2 of the invention>

Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

In the present embodiment, instead of the oil passage (2c) of the above-described first embodiment, which is formed by one space, as shown in Fig. 5, a partition plate (4c) is formed in the space.

That is, an upper portion is disposed between the motor case (37) and the case (41) A plurality of isolation plates (4c) extending downward. Then, since the oil passage (2c) is formed by a plurality of passages, heat dissipation of the power conversion element (44) can be performed more reliably. Other configurations, operations, and effects are the same as those in the first embodiment. Further, the rotor (34) and the stator (35) of the above motor (32) are clearly shown in FIG.

<Embodiment 3 of the invention>

Next, a third embodiment of the present invention will be described in detail with reference to the drawings.

In the present embodiment, instead of the control box (40) of the above-described first embodiment being embedded in the oil tank (20), the control box (40) is attached to the outside of the oil tank (20).

That is, as shown in Fig. 6, the back panel (4b) of the casing (41) of the control box (40) is mounted against the outer surface of the side wall (24) of the casing (21) of the tank (20). Further, mainly the portion of the side wall (24) of the casing (21) corresponding to the power conversion element (44) serves as a heat radiating portion (46). That is, the heat radiating portion (46) faces the oil flow portion (2b).

A heat dissipating rib (2d) is formed inside the side wall (24) of the casing (21) and the heat radiating portion (46). In addition, in FIG. 6, the oil pump (30) is abbreviate|omitted. The oil pump (30) may be disposed inside the oil tank (20) or may be disposed outside the oil tank (20). Other configurations, operations, and effects are the same as those in the first embodiment.

<Embodiment 4 of the invention>

Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings.

In the present embodiment, instead of the control box (40) of the above-described first embodiment being embedded in the oil tank (20), the control box (40) is attached to the outside of the oil tank (20).

That is, as shown in Fig. 7, the plate of the casing (41) of the control box (40) is formed into a rectangular parallelepiped or a rectangular parallelepiped having a back surface. Power of the above power converter (42) The shifting element (44) is mounted against the outer surface of the side wall (24) of the tank (20) housing (21). Further, mainly the portion of the side wall (24) of the casing (21) corresponding to the power conversion element (44) serves as a heat radiating portion (46). That is, the heat radiating portion (46) faces the oil flow portion (2b). In addition, in FIG. 7, the oil pump (30) is abbreviate|omitted. The oil pump (30) may be disposed inside the oil tank (20) or may be disposed outside the oil tank (20). Other configurations, operations, and effects are the same as those in the first embodiment.

<Embodiment 5 of the invention>

Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings.

In the present embodiment, instead of forming the oil return port (25) and the fuel injection port (26) in any of the above-described first embodiments, the control box (40) is brought close to the fuel injection port (26).

That is, as shown in Fig. 8, for example, the oil (11) returned from the actuator of the injection molding machine flows into the oil return port (25), and the oil return port (25) is formed on the cover body (22) away from the control. The corner of the box (40). For example, the oil (11) supplied to the actuator of the injection molding machine flows out from the fuel injection port (26), and the fuel injection port (26) is formed on the cover body (22) away from the corner of the control box (40). The corner of the control box (40). Further, the control box (40), in particular, the heat radiating portion (46) facing the oil flow portion (2b) is disposed closer to the fuel injection port (26) than the oil return port (25). As a result, it is possible to suppress the high-temperature oil (11) returning from the tank (20) from directly flowing into the heat radiating portion (46). In addition, in FIG. 8, the oil pump (30) is abbreviate|omitted. The oil pump (30) may be disposed inside the oil tank (20) or may be disposed outside the oil tank (20). Other configurations, operations, and effects are the same as those in the first embodiment.

<Embodiment 6 of the invention>

Next, a sixth embodiment of the present invention will be described in detail with reference to the drawings.

In the present embodiment, instead of the oil flow portion (2b) in the above-described fifth embodiment, the oil (11) is formed by one space, and the oil (11) is bent and flowed.

That is, as shown in Fig. 9, the oil tank (20) is provided with an obstruction plate (27). The obstruction plate (27) is disposed at a position closer to the upstream side than the heat dissipating portion (46), is formed at a substantially central portion of the oil tank (20), and is formed from the left side wall (24) to the right side wall (24). It is formed from the bottom plate (23) to a predetermined height. Therefore, the oil (11) returned from the above-mentioned oil return port (25) will escape the obstruction plate (27), that is, it will flow over the obstruction plate (27) into the fuel injection port (26).

As a result, it is possible to suppress the high temperature oil (11) from flowing into the heat radiating portion (46). Moreover, since the oil (11) is stirred, the heat transfer efficiency to the surroundings is improved. Further, it is possible to suppress the massive precipitate from being piled up in the vicinity of the heat radiating portion (46), thereby preventing the heat radiation effect from being lowered. In addition, in FIG. 9, the oil pump (30) is abbreviate|omitted. The oil pump (30) may be disposed inside the oil tank (20) or may be disposed outside the oil tank (20). Other configurations, operations, and effects are the same as those in the fifth embodiment.

<Embodiment 7 of the invention>

Next, a seventh embodiment of the present invention will be described in detail with reference to the drawings.

In the present embodiment, in place of the above-described sixth embodiment, the oil (11) is bent up and down, and the oil (11) is bent and flowed left and right.

That is, as shown in FIGS. 10 and 11, two obstacle plates (27) are provided on the oil tank (20). The two obstruction plates (27) are provided at predetermined intervals, one obstruction plate (27) is formed from the left side wall (24) toward the fuel injection port (26) to the vicinity of the right side wall (24), and the other obstruction plate (27) is The right side wall (24) is formed adjacent to the left side wall (24). Therefore, the oil (11) returned from the above-mentioned oil return port (25) is hindered The plate (27) is present and curved to flow left and right, and flows into the fuel injection port (26).

As a result, it is possible to suppress the high temperature oil (11) from flowing into the heat radiating portion (46). Moreover, since the oil (11) is stirred, the heat transfer efficiency to the surroundings is improved. Further, it is possible to suppress the massive precipitate from being piled up in the vicinity of the heat radiating portion (46), thereby preventing the heat radiation effect from being lowered. In addition, in FIGS. 10 and 11, the oil pump (30) is omitted. The oil pump (30) may be disposed inside the oil tank (20) or may be disposed outside the oil tank (20). Other configurations, operations, and effects are the same as those in the sixth embodiment.

<Embodiment 8 of the invention>

Next, an eighth embodiment of the present invention will be described in detail with reference to the drawings.

In the present embodiment, wiring measures are taken for the electric motor (32) of the first embodiment.

That is, as shown in FIG. 12, since the motor casing (37) is integrally formed with the back plate (4b) of the casing (41), the motor casing (37) and the casing (41) are formed. A wiring passage (4d) penetrating the inside of the casing (41) and the inside of the motor casing (37) through the motor casing (37) and the casing (41) is formed. Although not shown, the wiring path (4d) is provided with wiring for connecting the power converter (42) and the motor (32).

Therefore, since the main circuit of the oil pump (30) is shielded by the casing of the motor casing (37) or the like, electromagnetic electromagnetic standing (EMC) can be improved. Further, since the wiring is internal wiring, it is not necessary to use a double-covered electric wire, and the length of the wiring can be shortened. Since the electric wire coating layer does not need to have oil resistance, cost reduction can be achieved. Other configurations, operations, and effects are the same as those in the first embodiment.

<Other Embodiments>

The present invention can also have the following configurations in each of the above embodiments.

The hydraulic unit (10) is applied to an injection molding machine, but the hydraulic unit (10) may be applied to an apparatus for supplying oil (11) to an actuator of an industrial machine such as a machine tool or a press machine. in. Moreover, the above-described hydraulic unit (10) can also be applied to a device for circulating a liquid for cooling or lubricating a machine.

The rib (2a) on the casing (21) in the first embodiment can be omitted in the invention of the first aspect.

Furthermore, the above embodiments are examples of essentially the best embodiments, and the above embodiments are not intended to limit the invention, the applicability of the invention, and the purpose of the invention.

[Industrial Applicability]

In summary, the present invention is useful for a hydraulic unit having a power converter.

2a, 3a‧‧‧ ribs

2b‧‧‧ Oil Flow Department

2c‧‧‧ oil passage

4c‧‧‧Isolation board

4d‧‧‧Wiring path

10‧‧‧Hydraulic unit

11‧‧‧ oil

12‧‧‧Drive Control Department

20‧‧‧ fuel tank

21‧‧‧ cabinet

23‧‧‧floor

24‧‧‧ side wall

25‧‧‧Return port

26‧‧‧Injection port

27‧‧‧ obstruction board

30‧‧‧ oil pump

31‧‧‧ pump body

32‧‧‧Electric motor

33‧‧‧Drive shaft

37‧‧‧Shell

40‧‧‧Control box

41‧‧‧Box

42‧‧‧Power Converter

43‧‧‧Substrate

44‧‧‧Power conversion components

45‧‧‧Electrical components

46‧‧‧ Department of heat dissipation

Fig. 1 is a perspective view showing a portion of the hydraulic unit in the first embodiment omitted.

Fig. 2 is a perspective view showing, in an enlarged manner, a part of the hydraulic unit of the first embodiment.

Fig. 3 is a cross-sectional view schematically showing the hydraulic unit of the first embodiment.

Fig. 4 is a perspective view schematically showing the hydraulic unit of the first embodiment.

Fig. 5 is a perspective view showing, in an enlarged manner, a part of the hydraulic unit of the second embodiment.

Fig. 6 is a cross-sectional view schematically showing the hydraulic unit of the third embodiment.

Fig. 7 is a cross-sectional view schematically showing the hydraulic unit of the fourth embodiment.

Fig. 8 is a perspective view schematically showing the hydraulic unit of the fifth embodiment.

Fig. 9 is a perspective view schematically showing the hydraulic unit of the sixth embodiment.

Fig. 10 is a side perspective view schematically showing the hydraulic unit of the seventh embodiment.

Fig. 11 is a schematic perspective view showing the hydraulic unit of the seventh embodiment.

Fig. 12 is a perspective view showing, in an enlarged manner, a part of the hydraulic unit of the eighth embodiment.

2a, 3a‧‧‧ ribs

2b‧‧‧ Oil Flow Department

2c‧‧‧ oil passage

10‧‧‧Hydraulic unit

12‧‧‧Drive Control Department

20‧‧‧ fuel tank

21‧‧‧ cabinet

23‧‧‧floor

24‧‧‧ side wall

30‧‧‧ oil pump

31‧‧‧ pump body

32‧‧‧Electric motor

33‧‧‧Drive shaft

37‧‧‧Shell

40‧‧‧Control box

41‧‧‧Box

42‧‧‧Power Converter

43‧‧‧Substrate

44‧‧‧Power conversion components

45‧‧‧Electrical components

46‧‧‧ Department of heat dissipation

Claims (7)

A hydraulic unit comprising: a fuel tank (20) for storing oil (11), an oil pump (30) for circulating oil (11) between the oil tank (20) and an object, and driving and controlling the oil pump (30) The power converter (42) is characterized in that the power converter (42) is mounted on the oil tank (20), and the oil tank (20) faces the oil flowing in the oil tank (20) The flow portion (2b) constitutes a heat radiating portion (46) of the power conversion element (44) of the power converter (42). The hydraulic unit of claim 1, wherein: the oil tank (20) has a oil return port (25) and a fuel injection port (26), and the heat dissipating portion (46) is disposed closer to the oil return port (25). The position of the fuel injection port (26). The hydraulic unit according to claim 1 or 2, wherein the interference plate (27) is provided at a position closer to the upstream side than the heat transfer portion (46) of the oil flow portion (2b) of the oil tank (20). A hydraulic unit according to any one of claims 1 to 3, wherein the wall (24) of the tank (20) is provided with ribs (2a). The hydraulic unit according to any one of claims 1 to 4, wherein the control box (40) for loading the power converter (42) and the oil pump (30) are integrally formed to constitute a drive control unit (12) The drive control unit (12) is housed in the oil tank (20), and a wiring path (4d) for connecting the power converter (42) and the oil pump (30) wiring is formed in the drive control unit (12). . The hydraulic unit of any one of claims 1 to 5, wherein: The power conversion element (44) of the power converter (42) is disposed against the wall (24) of the fuel tank (20). A hydraulic unit according to any one of claims 1 to 6, wherein: said fuel tank (20) is a hydraulic oil tank of an injection molding machine.