JP6716294B2 - Hydraulic system - Google Patents

Description

According to the present invention, a hydraulic pump that sucks and discharges stored hydraulic oil to supply it to the load side and an electric motor that rotationally drives the hydraulic pump are placed on the upper plate of an oil tank that stores hydraulic oil, and discharges from the hydraulic pump. The present invention relates to a hydraulic device having a manifold provided with a control valve for controlling hydraulic oil and a return filter for removing dust mixed in the hydraulic oil flowing back to an oil tank from a load side.

In a conventional hydraulic system, a hydraulic pump and an electric motor that rotationally drives the hydraulic pump are mounted on the upper plate of an oil tank that stores hydraulic oil, and the hydraulic oil is rotationally driven to suck and discharge the hydraulic oil stored in the oil tank. To do. The hydraulic oil discharged from the hydraulic pump is controlled by a control valve provided in a manifold mounted on the upper plate and supplied to the actuator on the load side. The hydraulic oil returned from the actuator is returned to the oil tank after removing dust mixed in the hydraulic oil by a return filter arranged in a return pipe via a control valve and a manifold (for example, refer to Patent Document 1).

Micro film of Japanese Utility Model Application No. 51-31821 (Japanese Utility Model Application No. 52-123297)

By the way, in the hydraulic device disclosed in Patent Document 1, since the manifold and the return filter are arranged on the upper plate of the oil tank, the upper plate becomes large in size in order to secure the area to be arranged. There is a problem that the tank becomes large and the entire apparatus becomes large.

An object of the present invention is to provide a hydraulic device that can downsize the upper plate of an oil tank and suppress the increase in size of the entire device.

In order to achieve this object, the present invention has taken the following means. That is,
A substantially rectangular parallelepiped oil tank for storing hydraulic oil therein, a hydraulic pump for sucking and discharging the stored hydraulic oil, an electric motor for rotationally driving the hydraulic pump, a hydraulic oil discharged from the hydraulic pump and supplied to the load side, and/or Alternatively, a control valve that controls the hydraulic oil that flows back from the load side to the oil tank, a manifold with a substantially rectangular parallelepiped shape that arranges the control valve on the mounting surface, and dust that mixes into the hydraulic oil that flows back from the load side to the oil tank A return filter for removing the return oil is provided, and the return filter has a filter body formed with an inlet and an outlet for the hydraulic oil, and a casing in which a filter element for removing dust mixed in the hydraulic oil is housed is removable. mounted and configured, the hydraulic pump and the electric motor in the coaxially placed on the upper plate of the oil tank, placing the manifold and return filter on the side of the same side of the hydraulic pump and the electric motor, oil A plate-shaped horizontal portion that engages and fixes the upper plate of the tank, and a mounting member that is composed of a plate-shaped vertical portion that is substantially orthogonal to the horizontal portion and extends substantially parallel to the side wall of the oil tank, The hydraulic device is characterized in that the manifold is mounted on the vertical portion of the mounting member, and the mounting surface for mounting the control valve faces outward, and the return filter has the casing facing outward from the filter body. is there.

In this case, the disposition surface before Symbol manifold, may be disposed a plurality of control valves in parallel.

As described above in detail, in the invention according to claim 1, the hydraulic pump and the electric motor are concentrically placed on the upper plate of the oil tank, and the manifold and the return filter are connected to the hydraulic pump and the electric motor. A plate-shaped horizontal portion which is disposed on the same side and fixed by engaging with the upper plate of the oil tank, and a plate-shaped vertical portion which extends substantially perpendicular to the horizontal portion and substantially parallel to the side wall of the oil tank. The manifold is mounted on the vertical portion of the mounting member, and the mounting surface for mounting the control valve faces outward, and the return filter positions the casing from the filter body toward the outside. did. Therefore, it is not necessary to arrange the manifold and the return filter all on the upper plate, so that the upper plate of the oil tank can be downsized and the overall size of the device can be prevented from increasing. Also, since the manifold is arranged with the control valve mounting surface facing outward, it is possible to stack multiple control valves and install multiple control valves. It can be applied to a wide range of applications. Also, since the mounting member can easily fix the horizontal part by engaging it with the upper plate of the oil tank, and the manifold can be easily mounted on the plate-shaped vertical part that is easy to handle, it is easier to mount the manifold directly to the oil tank. However, the manifold can be easily attached.

In the invention according to claim 2 , a plurality of control valves are arranged in parallel on the surface where the manifold is arranged. For this reason, it is possible to favorably cope with parallel hydraulic circuits.

It is a front view of the hydraulic device showing one embodiment of the present invention. It is a left side view of FIG. It is a top view of FIG. It is a hydraulic circuit diagram of one embodiment.

An embodiment of the present invention will be described below with reference to the drawings.
1 to 4, reference numeral 1 denotes a tank for storing hydraulic oil therein, which is formed in a substantially rectangular parallelepiped shape having an upper opening, and the upper opening is closed by a removable upper plate 2. An electric motor 3 rotationally drives the hydraulic pump 4, which is mounted and fixed on the upper plate 2 via a plurality of buffer members 5 and a substrate member 6. The hydraulic pump 4 is concentrically fixed to one side surface of the electric motor 3 on the upper plate 2, and the rotational driving of the electric motor 3 sucks the working oil stored in the oil tank 1 from the suction pipe line 4A to the discharge pipe line 4B. Discharge. A protection member 7 is arranged above one side surface of the oil tank 1 for protecting an oil level gauge 7A for visually observing the stored amount of the working oil from the outside, and a discharge member for discharging the stored working oil is disposed below one side surface of the oil tank 1. A plug member 8 that detachably closes the outlet is provided. On the upper plate 2 of the oil tank 1, an oil injection port/air breather 9 for injecting hydraulic oil into the oil tank 1, a plurality of hook members 10 for lifting and moving the device, and a drain of the hydraulic pump 4 are introduced. A cooler 13 is provided for introducing and cooling from the pipe 11 and returning the cooled drain to the oil tank 1 through the drain outlet pipe 12. An oil pan 14 having a larger area than that of the oil tank 1 is installed below the oil tank 1 to collect the leaked hydraulic oil.

Reference numeral 15 is a mounting member for mounting the manifold 16, and is a plate-shaped horizontal portion 15A that engages with the upper plate 2 of the oil tank 1, and a plate-shaped portion that extends substantially orthogonal to the horizontal portion 15A and substantially parallel to the side wall 1A of the oil tank 1. And the vertical portion 15B. The mounting member 15 is detachably fixed to the upper plate 2 at the side of the hydraulic pump 4 and the electric motor 3 with the horizontal portion 15A by two bolt members 17. The manifold 16 is formed in a substantially rectangular parallelepiped shape and is detachably fixed to the vertical portion 15B of the mounting member 15 by four bolt members 18. The manifold 16 is arranged substantially parallel to the side wall 1A of the oil tank 1 so that the mounting surface 16A on which the control valves 17A and 17B are mounted faces outward.

The control valves 17A and 17B are electromagnetic directional switching valves that switch and control the flow direction of the hydraulic oil, and hydraulic oil that is discharged from the hydraulic pump 4 to the discharge pipe line 4B and supplied to an actuator (not shown) is returned to the oil tank 1 from the actuator. Two hydraulic oils are arranged in parallel on the installation surface 16A of the manifold 16 in the vertical direction. The discharge pipe line 4B is connected to the upper surface 16B orthogonal to the arrangement surface 16A of the manifold 16. Two connection ports 18A, 18B, 18C, 18D are provided on each side 16C of the manifold 16 which is orthogonal to the installation surface 16A and the upper surface 16B, and two connection ports 18A, 18B, 18C, 18D are provided for each of the control valves 17A, 17B. Enables piping connection to the actuator.

Reference numeral 19 denotes a return pipe that circulates the working oil that flows back from the actuator side to the oil tank 1, and includes a return filter 20 that removes dust mixed in the working oil. The return filter 20 includes a filter main body 21 having an inflow port 20A for inflowing the working oil from the actuator side and an outflow port 20B for outflowing the working oil from which dust has been removed, and a filter element for removing dust mixed in the working oil. The casing 22 is housed inside and detachably attached to the filter body 21. The return filter 20 has a valve body 24 that is biased by a spring 23 and shuts off between the inflow port 20A and the outflow port 20B. The valve element 24 is arranged in parallel with the filter element, and when the acting force based on the pressure of the hydraulic oil on the inlet 20A side exceeds the force of the spring 23 due to the clogging of the filter element, the valve element 24 is opened to open the inlet 20A and the outlet. It communicates with 20B.

Reference numeral 25 is a mounting bracket for mounting the return filter 20, which is arranged on the side of the hydraulic pump 4 and the electric motor 3 on the same side where the manifold 16 is arranged, and stands on the upper plate 2 of the oil tank 1. .. Two long holes 26A and 26B extending in the vertical direction are formed in the mounting bracket 25, and the bolt members 27A and 27B are screwed to the filter body 21 by inserting the long holes 26A and 26B. The filter body 21 is attached to the attachment bracket 25 by tightening bolt members 27A and 27B, and is attached so as to be vertically movable within the range of the long holes 26A and 26B. The casing 22 mounted on the filter main body 21 is arranged outward by mounting the filter main body 21 on the mounting bracket 25.

The return pipe 19 connects the first return pipe 19A connecting between the upper surface 16B of the manifold 16 and the inflow port 20A of the filter body 21, and the outflow port 20B of the filter body 21 and the oil tank 1 to the tip. And a second return pipe 19B which is immersed in the stored hydraulic oil. The first return pipe 19A is flexible and is provided to be bendable so as not to hinder the vertical movement of the filter body 21. The second return pipe 19B is formed from a steel pipe in a straight line shape, penetrates the upper plate 2 by sealingly sealing the upper plate 2, and moves the filter body 21 upward to immerse the tip end portion of the stored hydraulic oil in the stored hydraulic oil. It can be pulled out above the oil surface of.

Next, the operation of such a configuration will be described.
Connecting the connection ports 18A and 18B and the connection ports 18C and 18D of the manifold 16 to actuators (not shown), respectively, and rotating the hydraulic pump 4 by the electric motor 3 causes the hydraulic pump 4 to be stored in the oil tank 1 through the suction pipe line 4A. The oil is sucked and discharged to the discharge pipe line 4B. The discharged hydraulic oil flows inside the manifold 16, is controlled by the control valve 17A and the control valve 17B, and is supplied to the actuator from the control port 18A or 18B and the control port 18C or 18D. Return oil from the actuator flows through the control port 18B or 18A and the control port 18D or 18C, is controlled by the control valve 17A and the control valve 17B, flows through the first return pipe 19A from the inside of the manifold 16, and is returned to the return filter 20 as dust. Is removed, and flows through the second return pipe 19B and is returned to the oil tank 1. At this time, the valve body 24 of the return filter 20 is biased by the spring 23 and is closed.

If the filter element of the return filter 20 becomes clogged, the hydraulic oil will not flow easily, and the pressure of the hydraulic oil on the inlet 20A side will rise. When the acting force based on this pressure exceeds the force of the spring 23, the valve body 24 is opened, and the working oil flows through the second return pipe 19B without passing through the filter element and flows back to the oil tank 1.

When the clogged filter element is replaced with a new filter element, the hydraulic oil is allowed to flow through the filter element, the pressure on the inflow port 20A side is reduced, and the valve body 24 is biased by the force of the spring 23 to inflow the inflow port. The state between 17 and the outlet 18 is cut off, and the original state is obtained.

With this operation, the hydraulic pump 4 and the electric motor 3 are coaxially placed on the upper plate 2 of the oil tank 1, and the manifold 16 and the return filter 20 are placed on the same side of the hydraulic pump 4 and the electric motor 3. And the manifold 16 is arranged substantially parallel to the side wall 1A of the oil tank 1 so that the control valve 17A and the mounting surface 16A for mounting the control valves 17B face outward, and the return filter 20 is the filter body. The casing 22 was arranged from 21 toward the outside. Therefore, the manifold 16 and the return filter 20 do not have to be arranged on the upper plate 2, so that the upper plate 2 of the oil tank 1 can be downsized, and the overall size of the device can be prevented from increasing. Further, since the manifold 16 is arranged with the mounting surface 16A on which the control valves 17A and 17B are arranged facing outward, it is disposed between the electromagnetic directional control valve as the control valves 17A and 17B and the mounting surface 16A on the manifold 16. A plurality of other control valves can be stacked and a plurality of control valves can be arranged, and a control valve having a function according to the application can be added, and the invention can be applied to a wide range of applications.

Further, a plate-shaped horizontal portion 15A that engages and fixes the upper plate 2 of the oil tank 1, and a plate-shaped vertical portion 15B that extends substantially orthogonal to the horizontal portion 15A and extends substantially parallel to the side wall 1A of the oil tank 1. The mounting member 15 is composed of the above, and the manifold 16 is mounted on the vertical portion 15B of the mounting member 15. Therefore, the mounting member 15 can easily fix the horizontal portion 15A by engaging it with the upper plate 2 of the oil tank 1, and the manifold 16 can be easily attached to the vertical portion 15B which is plate-shaped and easy to handle. The manifold 16 can be easily attached, as compared with the case where the manifold 16 is attached.

A plurality of control valves 17A and 17B are arranged in parallel on the surface 16A of the manifold 16. For this reason, it is possible to favorably cope with parallel hydraulic circuits.

Further, a mounting bracket 25 is erected on the upper plate 2 of the oil tank 1, elongated holes 26A and 26B extending in the vertical direction are formed in the mounting bracket 25, and bolt members 27A and 27B are inserted through the elongated holes 26A and 26B. The filter body 21 of the return filter 20 was attached to the attachment bracket 25 by tightening. Therefore, the vertical position of the return filter 20 can be set at any position in the long holes 26A and 26B, and the position of the tip of the second return pipe 19B can also be set accordingly, so that the storage operation of the oil tank 1 is performed. The tip of the second return pipe 19B can be located at the optimum position according to the amount of oil.

Further, in the return filter 20, a casing 22 is attached to a filter main body 21 attached to an attachment bracket 25 so as to extend outward in the horizontal direction. Therefore, a space can be secured in the vertical position of the filter body 21 in the vertical direction, and the first return pipe 19A and the second return pipe 19B can be mounted in the vertical position of the filter body 21 in the substantially vertical direction. The return filter 20, the first return pipe 19A, and the second return pipe 19B can be arranged compactly.

In the embodiment, the hydraulic pump 4 is fixed to one side surface of the electric motor 3, but the hydraulic pump may be mounted and fixed on the upper plate of the oil tank. Further, although two control valves 17A and 17B are arranged in parallel in the manifold 16, the number of control valves is not limited to this, and one control valve or three or more control valves may be formed in parallel. Is.

1: Oil tank 2: Upper plate 3: Electric motor 4: Hydraulic pump
15: Mounting member 15A: Horizontal part 15B: Vertical part 16: Manifold 16A: Installation surface 17A, 17B: Control valve 20: Return filter 21: Filter body 22: Casing

Claims (2)

A substantially rectangular parallelepiped oil tank for storing hydraulic oil therein, a hydraulic pump for sucking and discharging the stored hydraulic oil, an electric motor for rotationally driving the hydraulic pump, a hydraulic oil discharged from the hydraulic pump and supplied to the load side, and/or Alternatively, a control valve that controls the hydraulic oil that flows back from the load side to the oil tank, a manifold with a substantially rectangular parallelepiped shape that arranges the control valve on the mounting surface, and dust that mixes into the hydraulic oil that flows back from the load side to the oil tank A return filter for removing the return oil is provided, and the return filter has a filter body formed with an inlet and an outlet for the hydraulic oil, and a casing in which a filter element for removing dust mixed in the hydraulic oil is housed is removable. mounted and configured, the hydraulic pump and the electric motor in the coaxially placed on the upper plate of the oil tank, placing the manifold and return filter on the side of the same side of the hydraulic pump and the electric motor, oil A plate-shaped horizontal portion that engages and fixes the upper plate of the tank, and a mounting member that is composed of a plate-shaped vertical portion that is substantially orthogonal to the horizontal portion and extends substantially parallel to the side wall of the oil tank, A hydraulic system characterized in that a manifold is mounted on a vertical portion of a mounting member, and a mounting surface for mounting a control valve faces outward, and a return filter has a casing arranged outward from a filter body. The hydraulic system according to claim 1, wherein a plurality of control valves are arranged in parallel on the surface on which the manifold is arranged.

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