JP2006258271A - Hydraulic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance cooling effect of a stored working oil by cooling the whole of the stored working oil in an oil tank by a self-cooling fan attached on an electric motor. <P>SOLUTION: A first cover part 12 for covering the electric motor and side plates 2A, ... at parts positioned below the electric motor 6 is provided such that cooling air flowing along a fin 8 of the electric motor 6 flows along fins 4 formed on the side plates 2A, ... and an outer wall from an upper plate 3 side of the oil tank 1 toward a bottom plate 2E side. Further, a second cover 13 for surrounding a gap formed between the bottom plate 2E and a ground-contact surface G over the whole periphery at the outside of the fins 4 of the side plates 2A, ... such that cooling air flowing to the bottom plate 2E side along the fins 4 of the side plates 2A, ... covered by the first cover 12 is led toward the fins 4 of the side plates 2A, ... not covered by the first cover 12 through an outer wall of the bottom plate 2E. Further, a cover member 11 is constituted by the first cover part 12 and the second cover part 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 that communicates 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 0008-0009, 0012, FIG. 1)

  However, in such a conventional hydraulic apparatus, it is difficult to cool the entire stored hydraulic oil in the oil tank because of the cooling of the hydraulic oil passing around the cavity, and it is difficult to obtain a satisfactory cooling effect of the stored hydraulic oil. there were.

  The subject of this invention makes it a subject to provide the hydraulic device which cools the whole stored hydraulic fluid of an oil tank with the self-cooling fan which an electric motor has, and raises the cooling effect of stored hydraulic fluid.

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 comprising an upper plate, a side plate, and a bottom plate for storing hydraulic oil therein and having a bottom plate spaced from the grounding surface is provided. Fins are formed on the outer side wall of the oil tank in the vertical direction. An electric motor that rotates a hydraulic pump that sucks stored hydraulic oil and discharges it to an external load is arranged on the upper plate of the tank. The electric motor has a fan, and the cooling air generated by the fan is formed on the fin formed on the outer periphery. The cooling air that flows along the fins of the motor flows along the fins formed on the outer wall of the side plate from the upper plate side to the bottom plate side of the oil tank in the lower part where the motor is arranged. The first cover portion covering the electric motor and the side plate of the portion located below the electric motor, and the cooling air flowing to the bottom plate side along the fins of the side plate covered by the first cover portion via the bottom plate outer wall The side plate that is not covered by the A hydraulic device characterized by comprising a cover member comprising a second cover portion surrounding the gap formed between the bottom plate and the grounding surface so as to guide it toward the outside of the fins of the side plate over the entire circumference. is there.

  In this case, a plurality of protruding members may be provided on the outer wall of the bottom plate of the oil tank so as to protrude downward. In addition, a control box that electrically connects the electric wiring of the motor and the electric wiring of an external power source is disposed on one side of the side plate of the electric motor and a portion located below the electric motor, You may comprise a part of 1st cover part. Furthermore, the electric motor may be arranged vertically on the upper plate with the fan facing upward and the fins arranged in the vertical direction, and the hydraulic pump may be attached to the back surface of the upper plate and arranged inside the oil tank. .

  As described in detail above, the invention described in claim 1 is the cooling by the fan that flows along the fins of the motor in order to cover the motor and the side plate of the portion located below the motor with the first cover portion of the cover member. Wind flows along the fins formed on the outer wall of the side plate from the upper plate side to the bottom plate side of the oil tank in the lower part where the electric motor is disposed, and the gap formed between the bottom plate and the ground plane is passed through the fins of the side plate. Since the outer cover is surrounded by the second cover portion of the cover member over the entire circumference, the cooling air flowing toward the bottom plate along the fins of the side plate covered by the first cover portion is covered by the first cover portion via the bottom plate outer wall. It is guided toward the fins of the side plates that are not, and can flow along the fins. For this reason, cooling air flows through many parts of the side plate outer wall and the bottom plate outer wall of the oil tank, and in combination with the heat dissipation effect of the fins formed on the side plate, the entire oil tank can be cooled. The entire stored hydraulic oil in the oil tank can be cooled by the fan, and the cooling effect of the stored hydraulic oil can be improved satisfactorily.

  Further, in addition to the effect of the invention described in claim 1, the invention described in claim 2 increases the surface area of the outer wall of the bottom plate by a plurality of projecting members provided so as to project downward on the bottom plate of the oil tank. The heat dissipation effect of oil can be further improved, and the cooling air flowing toward the bottom plate along the side plate fin covered with the first cover part can be easily guided toward the side plate fin not covered with the first cover part. Is also possible.

  In addition to the effects of the inventions described in claims 1 and 2, the invention described in claim 3 provides a control box for electrically connecting the electric wiring of the motor and the electric wiring of the external power source. Since a part of the first cover part is configured by being arranged on one side of the side plate of the lower part, the control box can also be used as a part of the first cover part, so the first cover part is a control box A portion that is also used can be eliminated, and the configuration can be simplified.

  In addition to the effects of the inventions described in claims 1 to 3, the electric motor is arranged vertically on the upper plate with the fan upward and the fins in the vertical direction. Since the hydraulic pump is attached to the back surface of the upper plate and disposed inside the oil tank, the hydraulic pump can be made more compact than a conventional device in which an electric motor and a hydraulic pump are disposed on the upper plate.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 5, reference numeral 1 denotes an oil tank, which is formed of an aluminum alloy in a substantially rectangular parallelepiped box shape having an upper opening, and closes the upper opening of the tank main body 2 for storing hydraulic oil therein. And an upper plate 3 made of an aluminum alloy. The tank body 2 of the oil tank 1 is formed by projecting a plurality of fins 4 on the four side plates 2A, 2B, 2C, and 2D in the vertical direction so as to protrude in the horizontal direction, thereby increasing the outer wall surface area of the side plates 2A to 2B. This improves the heat dissipation effect of stored hydraulic oil. In addition, each side plate 2A-2B has the long side in the side plates 2A and 2C facing each other, and the side plates 2B and 2D facing each other orthogonally to the long side plates 2A and 2C are short sides. Reference numeral 5 denotes a leg portion of the oil tank 1, which protrudes downward from the four corners of the bottom plate 2 </ b> E of the tank body 2, contacts the grounding surface G, and is provided separately from the grounding surface G. 6 is an electric motor that rotationally drives the hydraulic pump 9, and is arranged vertically in the position shifted on the side plate 2B side from the center on the upper plate 3 of the oil tank 1 with the fan 7 for self-cooling upward. A plurality of fins 8 are formed at equal intervals in the vertical direction on the outer periphery, and the cooling air from the fan 7 flows along the fins 8 as indicated by the arrow F and self-cools.

  A hydraulic pump 9 that is rotationally driven by the electric motor 6 is attached to the back surface of the upper plate 3 coaxially with the electric motor 6 and disposed inside the tank body 2 of the oil tank 1, and sucks stored hydraulic oil from the suction pipe 10 and is not shown. Discharge to an external load.

  Reference numeral 11 denotes a cover member, which is formed between the motor 6 and the side plate 2B positioned below the motor 6, the first cover portion 12 that covers a part of the side plate 2C, and a part of the side plate 2A, and the bottom plate 2E and the ground plane G. The second cover portion 13 is configured to surround the formed gap around the entire periphery of the side plates 2A to 2D outside the fins 4. The first cover portion 12 is a substantially quadrilateral plate-like upper plate 12A that covers the upper side of the electric motor 6 and the first cover portion 12 hangs downward from one side of the upper plate 12A and is positioned at the first side of the electric motor 6 and below the electric motor 6. A first side plate 12B that covers the side plate 2B, and a second side plate 12C that hangs downward from the two sides of the upper plate 12A and covers a part of the second side of the motor 6 and the side plate 2C located below the motor 6. The third side plate 12D that hangs downward from the three sides of the upper plate 12A and covers the third side of the motor 6 and contacts the lower end with the upper plate 3, and the fourth side of the motor 6 and the motor 6 One side of the lower side plate 2A is opened without being covered, and an opening 14 is formed in the upper plate 12A so as to face the fan 7 of the electric motor 6 so as to suck external cold air by the rotation of the fan 7 of the electric motor 6. is doing. A control box 15 having a substantially rectangular parallelepiped shape is disposed and covered on the fourth side of the electric motor 6 with the first cover portion 12 opened and on one side of the side plate 2A located below the electric motor 6. A part of the first cover portion 12 is configured by being attached to the attachment member 6A. The first cover portion 12 is fixed by attaching and fixing the lower ends of the first side plate 12B and the second side plate 12C to the second cover portion 13, respectively, and the cooling air that has flowed as indicated by the arrow F along the fins 8 of the electric motor 6, The fin 4 formed on the outer wall of the side plate 2B of the oil tank 1 covered with the first side plate 12B from the upper plate 3 side to the bottom plate 2E side of the oil tank 1, and the side plate 2C of the oil tank 1 covered with the second side plate 12C The fins 4 are formed to flow along the fins 4 formed on the outer wall and the fins 4 formed on the outer wall of the side plate 2A of the oil tank 1 covered with the control box 15 as indicated by arrows F1.

  The second cover portion 13 is a substantially quadrilateral plate-like shape that can accommodate the dimension of the bottom plate 2E of the oil tank 1 plus the lateral projecting dimension of the fins 4 formed on the side plates 2A to 2E. A bottom plate 13A, a first side plate 13B that stands up from one side of the bottom plate 13A, joins the lower end of the first side plate 12B of the first cover portion 12 and faces the side plate 2B of the oil tank 1, and two sides of the bottom plate 13A From the three sides of the bottom plate 13A, and the second side plate 13C, which is erected upward from the bottom plate 13A and joined to the lower end of the second side plate 12C of the first cover portion 12 to face the side plate 2C of the oil tank 1. A third side plate 13D that faces the side plate 2D of the tank 1 and a fourth side plate 13E that stands up from the four sides of the bottom plate 13A and contacts the bottom surface of the control box 15 and faces the side plate 2A of the oil tank 1 To do. The second cover portion 13 has four attachments in which each leg portion 5 of the oil tank 1 penetrates the bottom plate 13A, and the bottom plate 13A protrudes downward adjacent to each leg portion 5 to the bottom plate 2E of the oil tank 1. As shown by the arrow F2 on the bottom plate 2E side along the fins 4 of the side plates 2A, 2B and 2C of the oil tank 1 which is attached to the portion 16 and fixed at a slight distance from the ground contact surface G and covered with the first cover portion 12. The flowing cooling air is directed to the fins 4 of the side plates 2A, 2C, 2D that are not covered by the first cover portion 12 through the outer wall of the bottom plate 2E as indicated by the arrow F3.

  A plurality of projecting members 17 are provided on the outer wall of the bottom plate 2E of the oil tank 1 so as to project downward. The projecting members 17 are formed in a pin shape, and are arranged in alignment with the bottom plate 2E as shown in FIG. The surface area is increased to improve the heat dissipation effect of the stored hydraulic oil, and the cooling air flowing toward the bottom plate 2E along the fins 4 of the side plates 2A, 2B, 2C of the oil tank 1 covered with the first cover portion 12 It makes it easy to guide toward the fins 4 of the side plates 2A, 2C, and 2D that are not covered with the first cover portion 12. 7, the plurality of projecting members 17A are irregularly arranged on the bottom plate 2E, and the other projecting members 17B have different lateral dimensions as in the other modification shown in FIG. It can also be formed into a plurality of fin shapes.

  A manifold 18 is disposed on the upper plate 3 of the oil tank 1 and is provided to be exposed to the outside adjacent to the electric motor 6 covered with the first cover portion 12 of the cover member 11, and includes a plurality of control valves 19 and pressure switches. The control valve 19 and the pressure switch 20 are used to control the direction, flow control, pressure control, etc. of the hydraulic oil discharged from the hydraulic pump 9 to an external load (not shown) and the hydraulic oil returned from the external load to the oil tank 1. is there. Reference numeral 21 denotes a return pipe that circulates hydraulic oil from an external load to the oil tank 1, and is arranged in the oil tank 1 from the upper plate 3 in communication with the manifold 18. 22 is an oil breather with an air breather penetrating the upper plate 3, 23 is a pressure gauge connected to the discharge side of the hydraulic pump 9, 24 is an oil level meter disposed on the side plate 2 </ b> A of the oil tank 1, and 25 is an oil tank. 1 is an oil drain port disposed in the lower part of the side plate 2A. The control box 15 electrically connects the electric wirings 6B and 6C of the electric motor 6 and the electromagnetic wirings 19A and 19B of the control valve 19 with electric wirings of an external power source (not shown). The electric wirings 6B and 6C of the electric motor 6 are attached to the mounting member 6A. The inside of the control box 15 is introduced through the inside.

Next, the operation of this configuration will be described.
When the hydraulic pump 9 is driven by the electric motor 6, the hydraulic pump 6 sucks and discharges the stored hydraulic oil from the suction pipe 10, and this discharged hydraulic oil is controlled by the control valve 19 and supplied to an external load (not shown). The hydraulic oil from the load is controlled by the control valve 19 and flows through the return pipe 21 to return to the inside of the oil tank 1, and the temperature of the stored hydraulic oil inside the oil tank 1 rises until the heating and the heat radiation are in an equilibrium state.

  At this time, the electric motor 6 sucks external cold air from the opening 14 of the cover member 11 by the rotation of the fan 7, and the cooling air generated by this suction flows along the fins 8 as indicated by the arrow F to self-cool.

  The cooling air that has flowed along the fins 8 of the electric motor 6 is the outer wall of the side plate 2B of the oil tank 1 covered with the first side plate 12B of the first cover portion 12 from the upper plate 3 side to the bottom plate 2E side of the oil tank 1. The fin 4 formed on the outer side wall of the oil tank 1 covered with the second side plate 12C of the first cover portion 12 and the control box 15 constituting a part of the first cover portion 12 are covered. The oil tank 1 flows as indicated by an arrow F1 along the fins 4 formed on the outer wall of the side plate 2A.

  The cooling air that has flown along the side plates 2B of the oil tank 1 covered by the first cover portion 12, part of the side plates 2C, and part of the fins 4 of the side plate 2A flows as shown by the arrow F2 on the bottom plate 2E side, It is guided as indicated by an arrow F3 toward the remaining portion of the side plate 2C not covered by the first cover portion 12 through the outer wall of the bottom plate 2E, the side plate 2D, and the remaining portion of the side plate 2A as indicated by an arrow F3, and flows along the fin 4 .

  For this reason, cooling air can flow through many portions of the outer walls of the side plates 2A to 2D and the bottom plate 2E of the oil tank 1, and combined with the heat dissipation effect of the fins 4 formed on the side plates 2A to 2D, the oil tank 1 Since the whole can be cooled, the entire stored hydraulic oil in the oil tank 1 can be cooled by the self-cooling fan 7 included in the electric motor 6, and the cooling effect of the stored hydraulic oil can be improved satisfactorily.

  Moreover, the surface area of the outer wall of the bottom plate 2E can be increased by the plurality of projecting members 17, 17A, 17B provided to project downward from the bottom plate 2E of the oil tank 1, and the heat dissipation effect of the stored hydraulic oil can be further improved. Further, the cooling air flowing toward the bottom plate 2E along the fins 4 of the side plate 2B, the side plate 2C, and the side plate 2A covered with the first cover portion 12 is guided by the projecting members 17, 17A and 17B. Further, it is possible to easily guide toward the fins 4 of the remaining portion of the side plate 2C not covered with the first cover portion 12, the side plate 2D, and the remaining portion of the side plate 2A.

  Further, a control box 15 for electrically connecting the electric wirings 6B and 6C of the electric motor 6 and an electric wiring of an external power source (not shown) is arranged on one side of the side plate 2A of the portion located below the electric motor 6 and the electric motor 6. Since a part of the first cover part 12 is configured, the control box 15 can also be used as a part of the first cover part 12. Therefore, the first cover part 12 can be configured to eliminate the need for the control box 15 to be shared. It can be simplified.

  The electric motor 6 is arranged vertically on the upper plate 3 with the fan 7 facing upward and the fins 8 in the vertical direction, and the hydraulic pump 9 is mounted on the back surface of the upper plate 3 and arranged inside the oil tank 1. Therefore, it is possible to reduce the size as compared with the conventional device in which the electric motor and the hydraulic pump are arranged on the upper plate.

FIG. 9 shows another embodiment of the present invention, where the same portions as those of the embodiment are denoted by the same reference numerals and description thereof is omitted, and only different portions are described.
The first cover portion 12 is provided so that the second side plate 12 </ b> C extends downward and is joined to the bottom plate (13 </ b> A) of the second cover portion 13. A first side plate (12B) not shown also extends downward so as to be joined to the bottom plate (13A) of the second cover portion 13 in the same manner. The second cover portion 13 shortens the lateral dimension of the second side plate 13C according to the downward extension of the second side plate 12C of the first cover portion 12. Note that the first side plate (13B) (not shown) of the second cover portion 13 is deleted in accordance with the downward extension of the first side plate (12B) (not shown) of the first cover portion 12. And the part extended under 2nd side plate 12C of the 1st cover part 12 and the 1st side plate (12B) comprises a part of 2nd cover part 13, and obtains the effect similar to 1st embodiment. Can do.

    In each of the above embodiments, the control box 15 is arranged on one side of the electric motor 6 and the side plate 2A of the portion located below the electric motor 6 to constitute a part of the first cover portion 12, but as necessary. Of course, the control box 15 need not be provided. In this case, the first cover portion 12 may be changed to cover the portion covered with the control box 15 together.

1 is a front view of a hydraulic apparatus showing an embodiment of the present invention. It is a top view of FIG. FIG. 3 is a cross-sectional view taken along line BB in FIG. 2. It is a schematic perspective view of FIG. It is the schematic perspective view seen from the direction different from FIG. It is sectional drawing along line AA of FIG. It is sectional drawing which shows the modification of FIG. It is sectional drawing which shows the other modification of FIG. It is the schematic perspective view which showed other embodiment of this invention.

Explanation of symbols

1: Oil tank 2A, 2B, 2C, 2D: Side plate 2E: Bottom plate 3: Top plate 4, 8: Fin 6: Electric motor 7: Fan 9: Hydraulic pump 11: Cover member 12: First cover portion 13: Second cover Part

Claims (4)

  An oil tank comprising an upper plate, a side plate and a bottom plate for storing hydraulic oil therein and having a bottom plate separated from the grounding surface is provided, and fins are formed in the vertical direction on the outer wall of the side plate of the oil tank. An electric motor that rotates a hydraulic pump that sucks stored hydraulic oil and discharges it to an external load is arranged on the upper plate of the tank. The electric motor has a fan, and the cooling air generated by this fan is formed on the fin formed on the outer periphery. The cooling air that flows along the fins of the motor flows along the fins formed on the outer wall of the side plate from the upper plate side to the bottom plate side of the oil tank in the lower part where the motor is arranged. The first cover portion covering the electric motor and the side plate of the portion located below the electric motor, and the cooling air flowing to the bottom plate side along the fins of the side plate covered by the first cover portion via the bottom plate outer wall The side plate that is not covered by the Hydraulic apparatus characterized by comprising a cover member that constitutes the formed gap and a second cover portion which surrounds the entire circumference with fins outward of the side plates between the bottom plate and the ground plane to direct towards.   The hydraulic unit according to claim 1, wherein a plurality of projecting members are provided on the outer wall of the bottom plate of the oil tank so as to project downward.   A control box for electrically connecting the electric wiring of the electric motor and the electric wiring of an external power source is disposed on one side of the side plate of the motor and a portion located below the electric motor. The hydraulic apparatus according to claim 1 or 2, wherein a part of the cover portion is configured.   The electric motor is disposed vertically on the upper plate with the fan facing upward and the fins in the vertical direction, and the hydraulic pump is disposed on the back surface of the upper plate and disposed inside the oil tank. The hydraulic device according to any one of claims 1 to 3.

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