JPH08232901A - Hydraulic unit - Google Patents

Abstract

PURPOSE: To simplify an oil filing port by forming a notch-like fitting part for a suction pipe in a covering plate for a through hole of a tank-upper board, and forming mounting holes, to which the covering plate is mounted by screw members, out of fixed hole parts, through which the screw heads of the screw members are not passed, and plate loading and unloading hole parts which are directly connected to the fixed hole parts and through which the screw head parts of the screw members are passed. CONSTITUTION: When oil is filled into the tank, a front board of the tank is removed, screw members 28 are loosened, and a covering plate 25 is moved in the direction parallel to a suction pipe fitting part 26 on a tank-upper board 1A so that screw heads 28A of the screw members 28 are positioned at the plate loading and unloading parts 27A of mounting holes 27, and then the covering plate 25 is removed from the upper board 1A while the screw head parts 28A are passed through the plate holding and unholding parts 27A. Then the oil quantity in the tank is confirmed from the opening of a through hole 23, and when oil filling is needed, the oil is filled from the opening of the through hole 23. At this time, since a filter 13, and a suction pipe 12 are deviated from the center of the through hole 23, a large gap is formed between the outer face of the suction pipe 12 and the inner face of the through hole 23, confirmation of the oil quantity and the oil filling can be easily performed. Thus, there is no need for an exclusive oil filling port, and thus the oil filling port can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic unit that serves as a hydraulic source for various hydraulic actuators.

[0002]

2. Description of the Related Art Normally, in a hydraulic unit, an oil inlet is provided for a tank for storing hydraulic oil, as described in Japanese Utility Model Publication No. 4-44564. Such a lubrication port
Attach the cylinder to the tank so that it communicates with the inside of the tank, and use the tip of this cylinder as a lubrication port.At the tip of this cylinder, a closing lid is detachably screwed so that the lubrication port is always closed. ing.

[0003]

The above-mentioned lubrication port has a complicated structure, and it is necessary to drill holes in the tank, manufacture a cylinder, and attach the cylinder. is there. The present invention is intended to realize a hydraulic unit having a simple oil injection port.

[0004]

For this reason, according to the first aspect of the present invention, the hydraulic pump and the electric motor for driving the hydraulic pump are mounted on the upper plate of the tank, and the cover covers the devices on the upper plate of the tank. This is a hydraulic unit that can open this cover state, the upper plate of the tank is provided with a passage hole for guiding the suction pipe of the hydraulic pump to the inside of the tank, and the suction pipe is larger in the radial direction than the suction pipe. A suction filter located in the overhanging tank is attached, and the passage hole has a radial dimension larger than the suction pipe sufficient to allow the filter to pass, and the passage hole is filled with hydraulic oil. A cover plate that is attached to the upper plate by a screw member that is screwed to the tank is provided on the opening of the passage hole of the upper plate of the tank, and a fitting part where the suction pipe is fitted to the cover plate. The cover plate mounting hole, which is formed in a notch shape that is recessed toward the center side from one edge, and through which the screw member is inserted, is provided with a fixing hole portion that does not allow the head of the screw member to pass through and a fixing hole portion that is continuous with this fixing hole portion. And a detachable hole portion through which the head of the screw member passes.

According to the second aspect of the present invention, the mounting hole of the cover plate in the first aspect of the invention is such that the attachment / detachment hole portion is located closer to one end edge side of the cover plate than the fixing hole portion, and the fixing hole portion is provided. Is formed so as to extend from the attachment / detachment hole along the direction in which the fitting portion is recessed.

Further, in the invention described in claim 3, in the mounting hole of the cover plate in the invention described in claim 1, the fixing hole portion extends from the attachment / detachment hole portion in a direction intersecting with the recessed direction of the fitting portion. So formed.

Further, in the invention described in claim 4, the filter of the suction pipe in the invention described in claim 1, claim 2 or claim 3 is displaced in the radial direction from the position passing through the passage hole. So that it can be placed in the tank.

[0008]

According to this structure, when the tank is filled with oil, the cover is opened and the screw member, which is attached to the cover plate on the opening of the passage hole, is slightly loosened. After the cover plate is displaced so that the head of the screw member is located at the position, the cover plate is removed while passing the head of the screw member through the attachment / detachment hole.

When the cover plate is displaced, the mounting hole of the cover plate has the attaching / detaching hole portion located closer to the one edge of the cover plate than the fixing hole portion, and the fixing hole portion has the fixing hole portion. In the case of extending from the attachment / detachment hole along the direction of the fitting portion, the cover plate can be displaced on the tank upper plate in the direction parallel to the fitting portion, and the mounting hole of the cover plate As described in Item 3, in the case where the fixing hole portion extends from the attachment / detachment hole portion in the direction intersecting the direction in which the fitting portion is recessed,
The cover plate can be offset to rotate on the tank top plate.

Then, oil is injected into the tank from the opening of the passage hole through the gap between the inner wall of the passage hole and the suction pipe. In addition, at the time of this lubrication, the filter of the suction pipe
As described in claim 4, in the case where it is arranged inside the tank at a position that is radially offset from the position where it passes through the passage hole, a wide gap formed between the inner wall of the passage hole and the suction pipe. Can be used to lubricate.

As described above, since the passage hole for guiding the suction pipe of the hydraulic pump to the tank is used as the oil filling port, the hole for exclusive use of the oil filling port is not required, and the oil filling port is simply constructed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 is a tank for storing hydraulic oil therein, and a hydraulic pump 2 and an electric motor 3 for driving the hydraulic pump 2 are integrally connected to an upper plate 1A that closes the upper side thereof. Is mounted and attached via the anti-vibration rubber 4. A control valve device 5 is connected to the discharge pipe 6 of the hydraulic pump 2, and is connected to the return pipe 7 into the tank 1 and the supply / discharge pipe 10 connected to the supply / discharge pipe 10 to the hydraulic cylinder 9 via the hydraulic muffler 8. 11 is connected. Reference numeral 12 is a suction pipe of the hydraulic pump 2 having one end connected to the hydraulic pump 2 outside the tank and the other end extending into the tank 1. A suction filter 13 is connected to the other end of the suction pipe 12. The filter 13 has a larger diameter than the suction pipe 12.

The hydraulic cylinder 9 drives an elevator (not shown). The control valve device 5 is
When the elevator is raised, the supply / discharge pipe 11 is disconnected from the return pipe 7 and communicated with the discharge pipe 6, and the pressure oil from the hydraulic pump 2 driven by the electric motor 3 is supplied to the hydraulic cylinder 9 so that the cylinder 9 When the elevator is lowered and the elevator is lowered, the supply / discharge pipe 11 is disconnected from the discharge pipe 6 and communicated with the return pipe 7 to discharge the pressure oil from the hydraulic cylinder 9 into the tank 1 and It is designed to be retracted by the weight from the elevator.

Reference numeral 14 is a cover that covers the upper plate 1A of the tank 1 and covers the hydraulic pump 2, the electric motor 3, the control valve device 5 and other devices on the upper plate 1A. The cover 14 includes a frame member 15 integrally including both side plates 15A and 15B and an upper plate 15C, a front plate 16 and a rear plate 17. The frame member 15 has screw members 19 attached to mounting pieces 18 provided on both sides of the upper plate 1A of the tank 1 below the both side plates 15A and 15B.
Installed by. Front plate 16 and back plate 17
Is a size that reaches below the tank 1 from the upper plate 15C of the frame member 15, and is detachably attached to the frame member 15 and the tank 1 by the screw member 20 so as to cover the front side opening and the rear side opening of the frame member 15, respectively. It is installed. And front plate 1
6. A sponge-like sound absorbing material 21 is attached to each inner surface of the back plate 17 and both side plates 15A and 15B of the frame member 15.

As shown in FIG. 3, in the upper plate 1A of the tank 1, a through hole 23 for introducing the suction pipe 12 provided with the filter 13 into the tank 1 is formed together with an installation hole 22 for installing the hydraulic muffler 8. ing. Reference numeral 24 is a screw hole for attaching a cover plate 25 installed on the opening of the passage hole 23. The passage hole 23, as shown in FIG.
3 has a diameter larger than that of the filter 13 so that the filter 13 can be passed through the passage hole 23 and is biased toward the back plate 17 in the tank 1 so that the suction pipe 12 can pass therethrough. It is in contact with the inner surface of the hole 23 on the rear plate 17 side. That is, the filter 13 and the suction pipe 1
2 is radially offset from the center of the passage hole 23. In the hydraulic pump 2 and the electric motor 3, the filter 13 is biased with the end of the suction pipe 12 inserted into the tank 1 through the passage hole 13 together with the filter 13. The tank 1 is attached to the upper plate 1A of the tank 1 while being biased toward the rear plate 17 so as to take the above position. The opening of the passage hole 23 is used as an oiling hole, and the working oil is injected into the tank 1 through the gap between the inner surface of the passage hole 23 and the outer surface of the suction pipe 12.

The cover plate 25 is provided with a fitting portion 26 into which the suction pipe 12 is fitted by being recessed in a notched shape from one edge to the central portion side. Reference numeral 27 is a mounting hole into which a screw member 28 screwed into the screw hole 24 provided in the cover plate 25 is inserted, and the mounting hole 27 is the head portion 2 of the screw member 28.
Detachment hole portion 27A for passing 8A and this attachment / detachment hole portion 27
It is formed from a fixed hole portion 27B which is continuous with the fitting portion 26 from A to the side opposite to the end edge where the fitting portion 26 is cut out, and which extends continuously in parallel with the fitting portion 26 so as not to pass the head portion 28A. Then, the cover plate 25 is attached to the upper plate 1A of the tank 1 by the head portion 28A of the screw member 28 which is inserted through the fixing hole portion 27B.
It is sandwiched between and and is attached to the upper plate 1A. In this attached state, most of the openings of the passage holes 23 are covered with the cover plate 1A (see FIG. 4).
Things.

Next, the operation of this embodiment will be described. The hydraulic unit is normally operated with the front plate 16 and the rear plate 17 of the cover 14 attached. That is, when the elevator is raised, the hydraulic pump 2 is driven by the electric motor 3, the discharge pipe 6 and the supply / discharge pipe 11 are communicated by the control valve device 5, and the pressure oil from the hydraulic pump 2 is supplied to the hydraulic cylinder 9. , The cylinder 9 is advanced. Further, when the elevator is lowered, the electric motor 3 is stopped, the supply / discharge pipe 11 and the return pipe 7 are communicated by the control valve device 5, the pressure oil from the hydraulic cylinder 9 is returned to the tank 1, and the hydraulic cylinder 9 is retracted. To be done. At this time, a part of the opening of the passage hole 23 is not covered with the cover plate 25, but since the cover 14 covers the upper plate 1A of the tank 1, the inside of the tank 1 is maintained even in a long-term normal operation state. Foreign matter is prevented from entering the.

When performing maintenance work such as parts replacement on the hydraulic unit, the front plate 16 or, if necessary, the rear plate 17 is removed by removing the screw member 20. At this time, the cover plate 25 is also removed. Since most of the opening of the passage hole 23 is covered by the above, foreign matter can be suppressed from entering the tank 1 through the passage hole 23 as much as possible, and tools, various screw members, etc. are placed on the upper plate 1A. When the passage hole 2
It is possible to suppress the fall from 3 into the tank 1.

Lubrication of the tank 1 is carried out as needed by checking the amount of oil in the tank 1 at appropriate time intervals. That is, after removing the front plate 16, the screw member 28 is slightly loosened, and the cover plate 25 is attached to the attachment / detachment hole portion 27 of the attachment hole 27.
The cover plate 25 is pulled on the upper plate 1A of the tank 1 in a direction parallel to the fitting portion 26 so that the head portion 28A of the screw member 28 is located at A, and the head portion 28A is moved by the attaching / detaching hole portion 27A. The cover plate 25 is removed from the upper plate 1A while passing it. Then, the amount of oil in the tank 1 is confirmed from the opening of the passage hole 23, and when lubrication is required, oil is injected into the tank 1 from the opening of the passage hole 23. At this time, since the filter 13 and the suction pipe 12 are installed so as to be radially offset from the center of the passage hole 23, a large width gap is formed between the suction pipe 23 outer surface and the passage hole 23 inner surface.
The confirmation work and lubrication work can be easily performed.

Then, the cover plate 25 allows the head portion 28A of the screw member 28 to pass through the attachment / detachment hole portion 27A while the suction pipe 12 is inserted into the insertion portion 26, and then the shaft portion of the screw member 28 is fixed to the fixing hole. The cover plate 23 is attached to the upper plate 1A by shifting the cover plate 23 toward the rear plate 17 so as to fit the portion 27B and then tightening the screw member 28. In this way, when removing the cover plate 23, the screw member 28 need only be slightly loosened and not removed, and at the time of attachment, the loosened screw member 28 may be tightened. Since a small amount of rotation operation is required, the cover plate 25 can be easily and quickly attached and detached.

Further, since oil is injected into the tank 1 by utilizing the opening of the passage hole 23 in this manner, it is not necessary to form a hole dedicated to the oil injection port, the oil injection port can be easily formed, and the hydraulic unit can be manufactured at a low price. .

FIG. 7 shows another example of the cover plate 25. In this structure, one mounting hole 27 is provided on the opposite side of the fitting portion 26, and the fixing hole portion 27B is formed in an arc shape in a direction intersecting with the fitting portion 26 from the attaching / detaching hole portion 27A. When the cover plate 25 is removed, the screw member 2
8 is loosened, and the cover plate 25 is rotated clockwise until the head portion 28A of the screw member 28 is inserted through the attachment / detachment hole portion 27A on the upper plate 1A, and then the cover plate 25 is removed. The head portion 28 of the screw member 28 is inserted into the hole portion 27A.
A is inserted, and then the screw member 28 is inserted into the fixing hole portion 27B.
After the cover plate 25 is rotated counterclockwise so that the shaft portion of the cover plate is fitted, the screw member 28 is tightened to attach the cover plate 25, and when the cover plate 23 is removed, the screw member is attached as in the previous embodiment. You do not have to remove 28 just by loosening it,
Further, since it is sufficient to tighten the loosened screw member 28 at the time of attachment, the amount of rotation operation of the screw member 28 can be small at the time of attaching and detaching the cover plate 25, and the cover plate 23 can be attached and detached. Can be done easily and quickly.

If the cover plate 25 is made of a transparent material, the amount of oil in the tank 1 can be checked through the cover plate 25, and it is not necessary to remove the cover plate 25 when checking the amount of oil.

[0024]

As described above, according to the present invention, since the oil filling port of the tank is formed by the passage hole for guiding the suction pipe provided with the filter of the hydraulic pump into the tank, the hole for exclusive use of the oil filling port is not necessary. The hydraulic unit can be manufactured at low cost.

Since the cover plate is installed at the opening of the passage hole, foreign matter can be prevented from entering the tank through the passage hole when the cover is opened to perform maintenance work. The cover plate can be removed from the installed state by loosening the screw member slightly and shifting the cover plate so that the head of the screw member is located from the fixing hole part of the mounting hole to the attachment / detachment hole part. In addition, the cover plate removed, the screw member head is inserted into the attachment and detachment hole,
Since the cover plate can be attached by tightening the screw member after shifting the cover plate so that the screw member shaft part fits into the fixing hole, the rotation amount of the screw member can be small, and the cover plate can be attached and removed. Can be done easily.

Further, when the filter of the suction pipe is arranged in the tank at a position that is radially offset from the position where the suction pipe passes, as described in claim 2, when the filter is arranged in the tank, A large gap can be formed between the outer surface of the pipe and the inside of the tank to facilitate oiling.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a right side view showing an embodiment of the present invention partially broken away.

FIG. 3 is a plan view of the upper plate of the tank according to the embodiment of the present invention.

FIG. 4 is an enlarged plan view of an essential part in one embodiment of the present invention.

FIG. 5 is an enlarged plan view of a cover plate according to an embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view of a main part in one embodiment of the present invention.

FIG. 7 is an enlarged plan view showing another example of the cover plate.

[Explanation of symbols]

 1 Tank 1A Tank Upper Plate 2 Hydraulic Pump 3 Electric Motor 12 Suction Pipe 13 Filter 14 Cover 23 Passage Hole 25 Cover Plate 26 Fitting Portion 27 Mounting Hole 27A Attachment Hole 27B Fixing Hole 28 Screw Member 28A Screw Head

Claims (4)

[Claims] 1. A hydraulic unit in which a hydraulic pump and an electric motor for driving the hydraulic pump are mounted on an upper plate of a tank, and a cover for covering devices on the upper plate of the tank is provided so that the covered state can be opened. , The upper plate of the tank is provided with a passage hole that guides the suction pipe of the hydraulic pump to the inside of the tank, and the suction pipe is attached to the suction pipe that is larger in the radial direction than the suction pipe and is arranged in the tank. The hole has a radial dimension larger than the suction pipe, which is large enough to allow the filter to pass, and this hole is used as an oil inlet for injecting hydraulic oil into the tank. A cover plate that is attached to the upper plate by a screw member that is screwed to the tank is provided on the cover plate, and a fitting portion into which the suction pipe is fitted is formed in the cover plate in a notch shape that is recessed from one end edge toward the center side. The attachment hole of the cover plate through which the screw member is inserted is provided with a fixing hole portion that does not allow the head portion of the screw member to pass therethrough, and a detachable hole portion that is connected to the fixing hole portion and allows the head portion of the screw member to pass therethrough. A hydraulic unit characterized by. 2. The attaching / detaching hole portion of the mounting hole is located closer to one end edge side of the cover plate than the fixing hole portion, and the fixing hole portion extends from the attaching / detaching hole portion along the recess direction of the fitting portion. The described hydraulic unit. 3. The hydraulic unit according to claim 1, wherein the fixed hole portion of the mounting hole extends from the attachment / detachment hole portion in a direction intersecting a direction in which the fitting portion is recessed. 4. The hydraulic unit according to claim 1, 2 or 3, wherein the filter of the suction pipe is arranged in the tank at a position that is radially offset from a position where the filter passes through the passage hole.