JP4869651B2 - Hydraulic device - Google Patents

Description

  In the present invention, an electric motor that has a self-cooling fan and drives a hydraulic pump is disposed on an upper plate of an oil tank that stores hydraulic oil therein, and the stored hydraulic oil inside the oil tank is supplied by the fan of the electric motor. The present invention relates to a hydraulic device for cooling.

In this type of hydraulic system, an electric motor that drives a hydraulic pump with a fan for self-cooling is arranged on the upper plate of an oil tank that is formed in a substantially square shape that stores hydraulic oil therein, and the interior is hollow. A plurality of cylindrical members formed in the oil tank are passed through between the suction pipe immersion position and the return pipe immersion position inside the oil tank, and both ends thereof are welded and fixed to the side wall of the oil tank. Both ends of the cavity are opened to the side wall of the oil tank to communicate with the outside of the oil tank, and the cavity is blocked from the inside of the oil tank by a cylindrical member, and covers one end opening of the cavity communicating with the outside of the oil tank and the outside of the fan of the motor. In addition, a cover member is provided in which a communication path communicating between the cavity and the fan of the electric motor is formed. And by the suction action by the fan of the electric motor, the working oil passing around the cavity is dissipated by the suction of the fan through the inside of the cavity and cooled by the air passing through the inside of the cavity to cool the working oil stored in the oil tank. Yes.
JP-A-9-291901 (paragraph numbers 0007-0009, 0012, FIG. 1)

  However, in such a conventional hydraulic apparatus, in order to cool the stored hydraulic oil inside the oil tank, a cylindrical member in which the inside is formed into a cavity and both ends are welded and fixed to the side wall of the oil tank, one end opening of the cavity, and an electric motor This requires a cover member that covers the outside of the fan and that has a communication passage that communicates between the cavity and the fan of the electric motor. Therefore, there is a problem that the number of parts is large and the configuration is complicated.

  An object of the present invention is to provide a hydraulic device that cools stored hydraulic oil inside an oil tank with a simple configuration by reducing the number of parts.

In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
An oil tank that closes the upper opening with an upper plate and stores hydraulic oil inside, an electric motor that has a fan and self-cools with the cooling air generated by the fan, and that is driven by the electric motor to suck in the stored hydraulic oil and externally It has a hydraulic pump that discharges to the load, and the oil tank is recessed from the upper plate side to form a recessed portion that is cut off from the inside of the oil tank and opened to the outside. The oil tank is located directly under the recessed portion. A lower part is formed which is sealed from the outside and filled with the stored hydraulic oil up to the uppermost part, and the bottom surface of the depression part is formed on the surface of the plate member separating the depression and the lower part. The upper surface of the lower portion is formed, and the electric motor is arranged opposite the bottom surface of the hollow portion so that the cooling air from the motor fan is applied to the bottom surface of the hollow portion, and the hydraulic pump suction pipe and hydraulic oil from the external load are disposed. Return pipe to the inside of the oil tank and return it It penetrates the upper plate and immerses the tip side in the stored hydraulic oil. Inside the oil tank, a partition plate is placed between the soaking position of the suction pipe and the soaking position of the return pipe. The hydraulic device is characterized in that the suction pipe immersion part and the return pipe immersion part are separated from each other through the lower part without being directly connected by the partition plate. That is it.

In this case, the upper plate of the front Symbol oil tank provided a fixing member for fixing the electric motor on one side, the electric motor is arranged in a vertical direction by the fan upwardly so as to face the bottom surface of the recess portion The hydraulic pump is integrally connected to the lower side, and the fixing member is connected to the other side opposite to the one side that fixes the electric motor from hydraulic oil discharged from the hydraulic pump to the external load or the external load. You may fix the manifold which attaches the control element which controls at least any one of the hydraulic fluid which circulates in the inside of the said oil tank.

  As described above in detail, the invention according to claim 1 is the surface of the plate-shaped member in which the stored hydraulic oil is filled up to the uppermost portion in the lower portion of the oil tank and the upper surface of the lower portion is formed on the back surface. A bottom surface of the recess is formed, and the cooling air from the electric motor fan hits the bottom surface of the recess to cool the stored hydraulic fluid filled in the lower portion. For this reason, by forming a recess from the upper plate side of the oil tank, a lower portion filled with stored hydraulic oil is formed immediately below the recess, so that storage can be performed as in conventional devices. The number of parts can be reduced without requiring a cylindrical member or a cover member for cooling the hydraulic oil, and the stored hydraulic oil inside the oil tank can be cooled with a simple configuration.

According to the first aspect of the present invention, the hydraulic oil flowing through the return pipe from the external load and returning to the return pipe immersion portion inside the oil tank is cooled by the cooling air from the motor fan at the lower portion, and this cooling is performed. The hydraulic oil is sucked from the suction pipe of the hydraulic pump at the suction pipe immersion part. For this reason, the stored hydraulic fluid sucked by the hydraulic pump and discharged to the external load can be cooled more reliably.

In addition to the effect of the invention described in claim 1 , the invention described in claim 2 provides a hydraulic pump in a downward direction with a fan on one side of the fixing member provided on the upper plate of the oil tank. The integrally connected electric motor is arranged and fixed in the vertical direction, and at least the hydraulic oil discharged from the hydraulic pump to the external load or the hydraulic oil returned from the external load to the inside of the oil tank is fixed to the other side of the fixing member. Since the manifold to which the control element for controlling either one is attached is fixed, the electric motor, the hydraulic pump, the manifold, and the control element can be arranged together, and the entire apparatus can be made compact.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1 to FIG. 4, 1 is an oil tank for storing hydraulic oil therein, and two side plates 1A, 1B formed in a substantially L shape are arranged in parallel with a gap in the horizontal direction. The two side plates 1A and 1B are connected to each other with plate-like members 1C, 1D, 1E, 1F, and 1G except for the uppermost portion, hermetically sealed, formed into a substantially L-shaped box shape with the upper portion opened, and the upper opening is removable. The upper plate 2 is freely closed. By forming the oil tank 1 in a substantially L-shaped box shape, the oil tank 1 is recessed from the upper plate 2 side to form a recessed portion 3 that is blocked from the inside of the oil tank 1 and opened to the outside. The lower portion 4 that is located directly below the recess 3 and is sealed from the outside and filled with the stored hydraulic oil up to the uppermost portion is formed inside. One plate-like member 1E that connects the two side plates 1A, 1B partitions between the recessed portion 3 and the lower portion 4, forms the bottom surface 3A of the recessed portion 3 on the front surface, and lower on the back surface. An upper surface 4A of the portion 4 is formed.

  Reference numeral 5 denotes a hollow columnar fixing member that is erected on the upper plate 2 of the oil tank 1 and fixes the electric motor 6 to one side portion in the horizontal direction. The electric motor 6 fixed to the fixing member 5 is arranged in the vertical direction facing the bottom surface 3A of the recess 3 with the fan 6A on the back in the axial direction facing upward, and self-cools with the cooling air F generated by the rotation of the fan 6A. In both cases, the cooling air F is applied to the bottom surface 3 </ b> A of the recess 3. The cooling air F that hits the bottom surface 3A of the hollow portion 3 satisfactorily cools the stored hydraulic fluid that is filled up to the top of the lower portion 4 and is in contact with the upper surface 4A. A hydraulic pump 7 is integrally connected to the lower side of the electric motor 6 and is driven by the electric motor 6 to suck the stored hydraulic oil in the oil tank 1 and discharge it to an external load (not shown). Reference numeral 8 denotes a suction pipe of the hydraulic pump 7, which penetrates the upper plate 2 and is immersed in stored hydraulic oil at a location other than the lower portion 4 inside the oil tank 1. In addition, a space is formed between the upper plate 2 above the stored hydraulic oil at a location other than the lower portion 4 inside the oil tank 1.

  Reference numeral 9 denotes a manifold that fixes the electric motor 6 of the fixing member 5 to the other side opposite to the one side, and a plurality of control elements 10 are detachably attached. The plurality of control elements 10 controls the hydraulic oil discharged from the hydraulic pump 7 to the external load and the hydraulic oil that returns from the external load to the inside of the oil tank 1. A non-return valve that allows one-way flow, a throttle valve that throttles hydraulic oil, an electromagnetic switching valve that controls the flow direction of hydraulic oil, a pressure switch that detects the pressure of hydraulic oil, and the like. A discharge pipe 11 of the hydraulic pump 7 is connected to the lower surface of the manifold 9 and communicates with a plurality of ports 12 opened on a side surface of the manifold 9 through a flow path formed inside the manifold 9 and a plurality of control elements 10. Yes. The plurality of ports 12 are connected to an external load (not shown) by piping such as a hose. Reference numeral 13 denotes a return pipe for returning hydraulic oil from an external load to the inside of the oil tank 1. The return pipe 13 is connected to the lower surface of the manifold 9 with a discharge pipe 11 with a gap, and a plurality of ports 12 are formed in the manifold 9. The passage communicates with the passage through the plurality of control elements 10, and the tip portion penetrates through the upper plate 2 and is immersed in the stored hydraulic oil at a location other than the lower portion 4 in the oil tank 1 with a gap between the suction pipe 8 and the pipe. ing.

  Reference numeral 14 denotes a partition plate provided inside the oil tank 1, which is formed in a substantially L shape with the uppermost portion being lower than the substantially L-shaped side plates 1 </ b> A and 1 </ b> B and the side portions being shortened. The oil tank 1 is arranged between the soaking position of the suction pipe 8 and the soaking position of the return pipe 13 to divide the inside of the oil tank 1 into a suction pipe soaking part 8A and a return pipe soaking part 13A, and the uppermost part is oil of stored hydraulic oil. The tip of the side part extends into the lower part 4 and is located higher than the surface L. The suction pipe immersion part 8 </ b> A and the return pipe immersion part 13 </ b> A communicate with each other via the lower part 4 without being directly communicated by the partition plate 14.

  A cooler 15 cools the drain of the hydraulic pump 7 and recirculates it into the oil tank 1. The cooler 15 is fixed to one side of the fixing member 5 above the electric motor 6, and is connected to the hydraulic pump 7 and the introduction pipe 16 and oil. The lower part 4 of the tank 1 is connected to the lower part 4 by the outlet pipe 17, and the drain introduced from the introduction pipe 16 is cooled by the cooling air F generated by the suction of the external cold air by the fan 6 </ b> A of the electric motor 6. To reflux. Reference numeral 18 denotes a control panel fixed to the side of the upper plate 2, which electrically connects the motor 6, an electromagnetic switching valve, one of a plurality of control elements 10, a pressure switch and an external control device (not shown). The motor 6 and the electromagnetic switching valve are energized or de-energized by a command signal, or a detection signal from the pressure switch is output to an external control device. Reference numeral 19 denotes an oil supply port provided at the upper part of the side plate 1 </ b> A of the oil tank 1, and 20 denotes an oil level gauge provided at the upper part of the plate-like member 1 </ b> C of the oil tank 1.

Next, the operation of this configuration will be described.
When the hydraulic pump 7 is driven by the electric motor 6, the hydraulic pump 7 sucks the hydraulic oil stored in the suction pipe immersion portion 8 </ b> A inside the oil tank 1 from the suction pipe 8 and discharges it from the discharge pipe 11. Controlled by a plurality of control elements 10 and supplied from a port 12 to an external load (not shown), hydraulic oil from the external load is controlled by the plurality of control elements 10 from a port 12 and flows through a return pipe 13 to return inside the oil tank 1. It recirculates to the tube immersion part 13A, and the temperature of the stored hydraulic oil inside the oil tank 1 rises until heating and heat dissipation are in an equilibrium state.

  At this time, external cold air is sucked by rotation of the fan 6A of the electric motor 6, and the drain of the hydraulic pump 7 introduced into the cooler 15 is cooled by the cooling air F generated by the suction, and the electric motor 6 is self-cooled. . Further, the cooling air F flows downward and hits the bottom surface 3A of the recess 3 to cool the stored hydraulic oil that is filled up to the top of the lower portion 4 and is in contact with the upper surface 4A.

  Then, the hydraulic oil refluxed to the return pipe immersion part 13A of the oil tank 1 does not flow directly to the suction pipe immersion part 8A by the partition plate 14, but flows to the suction pipe immersion part 8A through the lower part 4 and this return pipe immersion. The hydraulic fluid flowing from the portion 13A to the suction pipe immersion portion 8A can be reliably cooled by the lower portion 4, and the entire stored hydraulic fluid can be uniformly cooled.

  By such operation, the lower portion 4 filled with the stored hydraulic oil up to the uppermost portion is formed immediately below the recess 3 by forming the recess 3 by recessing from the upper plate 2 side of the oil tank 1. The number of parts can be reduced without the need for a cylindrical member or a cover member for cooling the stored hydraulic oil as in the above apparatus, and the stored hydraulic oil inside the oil tank can be cooled with a simple configuration.

  In addition, the hydraulic fluid that flows from the external load through the return pipe 13 and returns to the return pipe immersion portion 13A inside the oil tank 1 is cooled by the cooling air F by the fan 6A of the electric motor 6 in the lower portion 4 and this cooled hydraulic oil. Is sucked from the suction pipe 8 of the hydraulic pump 7 by the suction pipe immersion part 8A, so that the stored hydraulic oil cooled by the lower part 4 can be sucked by the hydraulic pump 7 and discharged from the hydraulic pump 7 to an external load. Can be cooled even more reliably.

  Further, on one side portion of the fixing member 5 provided on the upper plate 2 of the oil tank 1, an electric motor 6 integrally connected with a hydraulic pump 7 is fixed in a vertical direction with the fan 6A facing upward. At the same time, a manifold for attaching at least one of hydraulic fluid discharged from the hydraulic pump 7 to the external load and hydraulic fluid returned from the external load to the inside of the oil tank 1 is attached to the other side of the fixed member 5. Since 9 is fixed, the electric motor 6, the hydraulic pump 7, the manifold 9, and the control element 10 can be arranged together, and the entire apparatus can be made compact.

  Further, since the drain of the hydraulic pump 7 is cooled by the cooler 15 and is returned to the lower portion 4 of the oil tank 1, the entire stored hydraulic fluid in the oil tank 1 can be further efficiently cooled. The cooler 15 is fixed to the upper side of the electric motor 6 at one side of the fixing member 5 and cooled by the cooling air F generated by the rotation of the fan 6A of the electric motor 6. Therefore, the fan 6A of the electric motor 6 can be used. Without the need for a separate fan.

In one embodiment, the oil tank 1 is formed in a substantially L-shaped box shape by arranging two side plates 1A, 1B formed in a substantially L shape and facing each other in parallel with a gap in the horizontal direction. In this way, the recess 3 is formed to be recessed from the upper plate 2 side and cut off from the inside of the oil tank 1 to be opened to the outside, but the horizontal center of the oil tank is recessed from the upper plate side to form the recess. Of course, you may do .

1 is a front view of a hydraulic apparatus showing an inside of an oil tank in a cross section and showing a control panel with imaginary lines in an embodiment of the present invention. It is the left view of FIG. 1 which showed the inside of an oil tank in the cross section. It is the rear view of FIG. 1 which showed the inside of an oil tank in the cross section. It is a right view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Oil tank 1E: Plate-shaped member 2: Upper plate 3: Indentation part 3A: Bottom surface 4: Low level part 6: Electric motor 6A: Fan 7: Hydraulic pump 8: Intake pipe 8A: Intake pipe immersion part 9: Manifold 10: Control Element 13: Return pipe 13A: Return pipe immersion part F: Cooling air

Claims (2)

An oil tank that closes the upper opening with an upper plate and stores hydraulic oil inside, an electric motor that has a fan and self-cools with the cooling air generated by the fan, and that is driven by the electric motor to suck in the stored hydraulic oil and externally It has a hydraulic pump that discharges to the load, and the oil tank is recessed from the upper plate side to form a recessed portion that is cut off from the inside of the oil tank and opened to the outside. The oil tank is located directly under the recessed portion. A lower part is formed which is sealed from the outside and filled with the stored hydraulic oil up to the uppermost part, and the bottom surface of the depression part is formed on the surface of the plate member separating the depression and the lower part. The upper surface of the lower portion is formed, and the electric motor is arranged opposite the bottom surface of the hollow portion so that the cooling air from the motor fan is applied to the bottom surface of the hollow portion, and the hydraulic pump suction pipe and hydraulic oil from the external load are disposed. Return pipe to the inside of the oil tank and return it It penetrates the upper plate and immerses the tip side in the stored hydraulic oil. Inside the oil tank, a partition plate is placed between the soaking position of the suction pipe and the soaking position of the return pipe. Is divided into a suction pipe immersion part and a return pipe immersion part, and the suction pipe immersion part and the return pipe immersion part are communicated with each other via a lower portion without being directly communicated by a partition plate . A fixing member for fixing the electric motor to one side portion is provided on the upper plate of the oil tank, and the electric motor is arranged vertically with the fan facing upward and facing the bottom surface of the hollow portion. The fixing member is integrally connected to the lower side, and the fixing member is connected to the other side portion opposite to the one side portion for fixing the electric motor from the hydraulic oil discharged from the hydraulic pump to the external load or from the external load to the oil tank. 2. The hydraulic apparatus according to claim 1, wherein a manifold to which a control element for controlling at least one of the hydraulic oil flowing back to the inside is fixed is fixed.

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