JP6384494B2 - 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 hydraulic unit that includes a base to which a pump and a motor for driving the pump are fixed, and an oil tank that stores oil supplied to the pump is disposed below the base. In the oil tank, an inflow pipe serving as a return port for return oil from the actuator or hydraulic circuit of the main engine and a supply pipe for supplying the oil in the oil tank to the pump are arranged.

Japanese Patent Laid-Open No. 6-42501

  In the conventional oil tank, dust contained in the oil flowing in from the inflow pipe may accumulate on the bottom surface of the oil tank, and there is a problem that the dust is supplied to the pump together with the oil from the supply pipe. Therefore, it is conceivable to arrange a partition plate that partitions the inlet of the inflow pipe and the supply port of the supply pipe inside the conventional oil tank. In this case, the oil that flows in from the inflow pipe is supplied to the supply pipe through the communication hole formed in the partition plate, but the dust contained in the oil that flows in from the inflow pipe is more separated from the supply pipe than in the case where there is no partition plate. It becomes difficult to be supplied to the pump. However, when the communication hole is formed at the lower end of the partition plate, dust accumulated on the bottom surface of the oil tank may flow along with the oil from the communication hole toward the supply pipe, and the dust contained in the oil is supplied to the pump. The problem remains.

  Therefore, an object of the present invention is to provide a hydraulic unit capable of preventing dust in the oil tank from being supplied to the pump together with the oil when the oil in the oil tank is supplied to the pump.

A hydraulic unit according to a first aspect of the present invention includes a gantry on which a pump is placed, and an oil tank that is disposed below the gantry and accommodates oil supplied to the pump. An inflow pipe for allowing oil to flow into the oil tank; a drain hose for returning the oil discharged from the pump to the oil tank; a supply pipe for supplying the oil contained in the oil tank to the pump; and the inflow and inlet and drain port of the drain hose of the tube, the a partition plate partitioning the supply port of the supply pipe is disposed, said partition plate, said inlet pipe and said inlet-side space drainage hose is placed A communication port that communicates with a supply port side space in which the supply pipe is disposed; the communication port is separated from a bottom surface of the oil tank; and the partition plate is introduced from the lower end of the communication port. To the side space Has a movement restricting portion extending Te, the movement restricting portion, the inflow and out of the drain hose, that the lower end is disposed on the bottom surface to the closer lower than a height of said oil tank Features.

  In this hydraulic unit, since the oil flowing in from the inflow pipe moves from the communication port of the partition plate away from the bottom surface of the oil tank to the supply pipe side, dust contained in the oil in the inlet side space is separated from the partition plate. It is dammed by the part below the communication port. Therefore, the dust contained in the oil in the inlet side space is difficult to move to the supply port side space. Therefore, it can prevent that the dust contained in the oil in an oil tank is supplied to a pump.

  In this hydraulic unit, after the oil in the inlet side space circulates below the movement restricting portion, it moves to the supply port side space via the communication port, so that the dust contained in the oil in the inlet side space is supplied. It is possible to effectively prevent movement to the mouth side space.

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 movement restricting portion is configured by bending a part of the partition plate at a lower end portion of the communication port. To do.

  In this hydraulic unit, the movement restricting portion can be easily configured by bending a part of the partition plate at the lower end portion of the communication port.

A hydraulic unit according to a third aspect of the present invention is the hydraulic unit according to any one of the first to second aspects of the invention, wherein the oil tank has one of the inlet side space and the supply port side space of the oil tank. A waste oil port communicating with an external space is provided, and the partition plate has an opening formed at a lower end portion thereof.

  In this hydraulic unit, the oil in the oil tank can flow out from the waste oil outlet.

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

  In the first invention, since the oil flowing in from the inflow pipe moves from the communication port of the partition plate away from the bottom surface of the oil tank to the supply pipe side, the dust contained in the oil in the inlet side space is separated from the partition. It is dammed by the lower part from the communication port of the plate. Therefore, the dust contained in the oil in the inlet side space is difficult to move to the supply port side space. Therefore, it can prevent that the dust contained in the oil in an oil tank is supplied to a pump.

In the first invention, after the oil in the inlet side space circulates below the movement restricting portion, the oil moves to the supply port side space through the communication port, so that dust contained in the oil in the inlet side space is It is possible to effectively prevent movement to the supply port side space.

In 2nd invention, a part of partition plate is bend | folded in the lower end part of a communicating port, A movement control part can be comprised easily.

In 3rd invention, the oil in an oil tank can be discharged outside from a waste oil port.

It is a front view of the hydraulic unit concerning the embodiment of the present invention. It is a perspective view which shows the structure inside an oil tank. It is a top view which shows the structure inside an oil tank. It is a front view which shows the structure inside an oil tank. In this invention and a comparative example, the fluid state when the oil which flowed into the inflow side space from the inflow port of the inflow pipe and the drain port of the drain hose flows into the supply side space is illustrated.

  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 according to the present embodiment is disposed below a frame 4 on which a motor 2 and a pump 3 driven by the motor 2 are mounted, and is supplied to the pump 3. And an oil tank 5 for storing oil.

  The gantry 4 includes an inflow pipe 7 that is a return port of return oil from the actuator of the main engine or a hydraulic circuit, and a drain hose for returning drain oil that has been discharged from the pump 3 and then cooled by a cooler to the oil tank 5. 8, a supply pipe 9 for supplying the oil in the oil tank 5 to the pump 3, and an oil supply pipe (not shown) constituting an oil supply port for supplying oil to the oil tank 5 are attached. These inflow pipe 7, drain hose 8, supply pipe 9 and oil supply pipe are all members that extend into the oil tank 5.

  2 to 4 are a perspective view, a plan view, and a front view showing the internal configuration of the oil tank 5. An inflow pipe 7, a drain hose 8, and a supply pipe 9 are disposed inside the oil tank 5. Therefore, the return oil from the main engine actuator or hydraulic circuit flows into the oil tank 5 from the inlet 7 a formed at the lower end of the inflow pipe 7, and the drain oil flows from the drain port 8 a formed at the lower end of the drain hose 8. Returned to the oil tank 5. On the other hand, oil in the oil tank 5 is supplied to the pump 3 from a supply port 9 a formed at the lower end of the supply pipe 9.

  Inside the oil tank 5, a partition plate 20 that partitions the inflow port 7 a of the inflow pipe 7 and the drain port 8 a of the drain hose 8 and the supply port 9 a of the supply pipe 9 is disposed. The partition plate 20 extends upward from the bottom surface 5a or the vicinity of the bottom surface 5a of the oil tank 5, and includes an inflow side space 30 in which the inflow port 7a of the inflow tube 7 and the drain port 8a of the drain hose 8 are disposed, and a supply tube The communication port 21 communicates with the supply side space 31 in which the nine supply ports 9a are arranged. Since the communication port 21 is separated from the bottom surface 5 a of the oil tank 5, the communication port 21 is disposed above the communication port lower wall portion 25 that is a part of the partition plate 20. In the present invention, the method of attaching the partition plate 20 to the oil tank 5 can be changed, and may be attached to the bottom surface, the side surface, or the like of the oil tank 5.

  The partition plate 20 includes a movement restricting portion 27 that extends from the lower end portion of the communication port 21 (the upper end portion of the communication port lower wall portion 25) toward the inflow side space 30. The movement restricting portion 27 is configured by bending a part of the partition plate 20 at the lower end portion of the communication port.

  The oil tank 5 has a waste oil port 11 that allows the inflow side space 30 to communicate with the external space of the oil tank 5. The waste oil port 11 is arranged on the side surface on the front side of the oil tank 5 and is opened when the waste oil in the oil tank 5 flows out from the waste oil port 11 to the outside. An opening 20 a is formed at the lower end of the partition plate 20, and the oil in the supply side space 31 can be moved to the inflow side space 30.

  In the oil tank 5 of the embodiment of the present invention and the oil tank 105 of the comparative example, the oil that flows into the inflow side space 30 from the inflow port 7 a of the inflow pipe 7 and the drain port 8 a of the drain hose 8 flows into the supply side space 31. Explain the flow of time. In the oil tank 105 of the comparative example, a communication port 121 that connects the inflow side space 30 and the supply side space 31 is formed at the lower end of the partition plate 120.

  5 (a) and 5 (b) show the oil supplied from the inlet 7a of the inlet pipe 7 and the drain port 8a of the drain hose 8 into the inlet side space 30 in the present invention and the comparative example, respectively. The flow state when flowing to 31 is illustrated.

  In the comparative example, as shown in FIG. 5 (b), the oil that flows into the inflow side space 30 from the inflow port 7 a of the inflow pipe 7 and the drain port 8 a of the drain hose 8 is formed at the lower end of the partition plate 120. The dust flows from 121 to the supply-side space 31. At this time, the dust accumulated on the bottom surface 105 a of the oil tank 105 flows into the supply-side space 31 together with the oil. Therefore, thereafter, oil containing dust is supplied from the supply pipe 13 to the pump 3 in the supply-side space 31.

  On the other hand, in the present invention, as shown in FIG. 5A, the oil that has flowed into the inflow side space 30 from the inflow port 7 a of the inflow pipe 7 and the drain port 8 a of the drain hose 8 enters the upper end of the partition plate 20. Although it flows from the formed communication port 21 to the supply side space 31, the dust accumulated on the bottom surface 5 a of the oil tank 5 is blocked by the communication port lower wall portion 25 which is a part of the partition plate 20. Therefore, it is possible to suppress the dust accumulated on the bottom surface 5a of the oil tank 5 from flowing into the supply side space 31 together with the oil. Thereafter, the oil containing the dust is supplied from the supply pipe 13 to the pump 3 in the supply side space 31. Can be prevented.

  Moreover, in this invention, the partition plate 20 has the movement control part 27 extended toward the inflow port side space 30 from the lower end part (upper end part of the communicating port lower wall part 25) of the communicating port 21. FIG. From the inlet 7a of the inflow pipe 7 and the drain port 8a of the drain hose 8, the oil flowing into the inflow side space 30 circulates below the movement restricting portion 27, during which dust contained in the oil is collected in the oil tank 5. It accumulates on the bottom surface 5a. Therefore, it is possible to effectively prevent dust accumulated on the bottom surface 5a of the oil tank 5 from flowing into the supply port side space 31 from the communication port 21 formed at the upper end of the partition plate 20 together with the oil.

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

  In the hydraulic unit 1 of the present embodiment, the oil flowing in from the inflow pipe 7 moves from the communication port 21 of the partition plate 20 away from the bottom surface 5a of the oil tank 5 to the supply pipe 9 side. The dust contained in the oil is dammed by the communication port lower wall portion 25 from the communication port 21 of the partition plate 20. Therefore, the dust contained in the oil in the inlet side space 30 is difficult to move to the supply port side space 31. Therefore, the dust contained in the oil in the oil tank 5 can be prevented from being supplied to the pump 3.

  In the hydraulic unit 1 of the present embodiment, the oil in the inlet side space 30 circulates below the movement restricting portion 27 and then moves to the supply port side space 31 via the communication port 21. It is possible to effectively prevent the dust contained in the oil from moving to the supply port side space 31.

  In the hydraulic unit 1 of the present embodiment, the movement restricting portion 27 can be easily configured by bending a part of the partition plate 20 at the lower end portion of the communication port 21.

  In the hydraulic unit 1 of the present embodiment, since the partition plate 20 has the opening 20a formed at the lower end thereof, the oil in the oil tank 5 can be discharged from the waste oil port 11 to the outside.

  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-described embodiment, the oil tank 5 is supplied with the drain pipe cooled by the cooler after being discharged from the pump 3 and the inflow pipe 7 that is the return port of the return oil from the actuator or hydraulic circuit of the main engine. Although the case where the drain hose 8 for returning to the tank 5 and the supply pipe 9 for supplying the oil in the oil tank 5 to the pump 3 have been described, either the inflow pipe 7 or the drain hose 8 is provided. It may be arranged. Therefore, either the inflow pipe 7 or the drain hose 8 may be arranged as the inflow pipe of the present invention.

  In the above-described embodiment, the case where the communication hole 21 is formed at the upper end of the partition plate 20 has been described, but the communication hole 21 only needs to be separated from the bottom surface of the oil tank.

  In the above-described embodiment, the case where the partition plate 20 includes the movement restriction unit 27 has been described. However, the partition plate 20 may not include the movement restriction unit 27.

  In the above-described embodiment, the case where the partition plate 20 has the opening 20a has been described. However, the partition plate 20 may not have the opening 20a.

DESCRIPTION OF SYMBOLS 1 Hydraulic unit 3 Pump 4 Base 5 Oil tank 5a Bottom face of oil tank 7 Inflow pipe,
8 Drain hose 9 Supply pipe 11 Waste oil port 20 Partition plate 20a Opening 21 Communication hole 27 Movement restricting portion 30 Inflow side space 31 Supply side space

Claims (3)

A platform on which the pump is mounted;
An oil tank disposed below the gantry and containing oil supplied to the pump;
In the oil tank,
An inflow pipe for flowing oil into the oil tank;
A drain hose for returning the oil discharged from the pump to the oil tank;
A supply pipe for supplying the oil stored in the oil tank to the pump;
Wherein the drain port of the inflow port and the drain hose of the inlet pipe, the supply port of the supply pipe and the partition plate for partitioning the is arranged,
The partition plate is
A communication port for communicating the inflow side space in which the inflow pipe and the drain hose are arranged and the supply side space in which the supply pipe is arranged;
The communication port is away from the bottom surface of the oil tank ;
The partition plate has a movement restricting portion extending from a lower end portion of the communication port toward the inflow side space,
The hydraulic control unit, wherein the movement restricting portion is disposed at a height equal to or higher than a lower end of the inflow pipe and the drain hose, the lower end being closer to the bottom surface of the oil tank . The hydraulic unit according to claim 1 , wherein the movement restricting portion is configured by bending a part of the partition plate at a lower end portion of the communication port. The oil tank has a waste oil port that communicates either the inflow side space or the supply side space with the external space of the oil tank,
The partition plate, the hydraulic unit according to claim 1 or 2, characterized in that it comprises an opening formed in its lower end.

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