Hydraulic power unit and hydraulic elevator

Abstract

To provide a hydraulic power unit and a hydraulic elevator that can reduce the weight of a pump base.SOLUTION: A hydraulic power unit 11 includes a hydraulic pump 24, a motor 25, a pump base 31, a lower base 22, and a plurality of vibration-isolating members 29. The motor 25 drives the hydraulic pump 24. The pump base 31 supports the hydraulic pump 24 and the motor 25. The pump base 31 is fixed to the lower base 22. The plurality of vibration-isolating members 29 are interposed between the lower base 22 and an installation stand disposed at the installation location.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a hydraulic power unit and a hydraulic elevator. [Background technology]

[0002] Hydraulic elevators are used in factories, apartment buildings, hotels, etc. Hydraulic elevators support the weight of the car and other components with hydraulic jacks. The hydraulic jacks are installed at the bottom of the building. Therefore, hydraulic elevators place less strain on the building. Furthermore, hydraulic elevators do not require a machine room to be installed at the top of the building, making it possible to make effective use of the upper part of the building and easily comply with height restrictions on the elevator shaft.

[0003] A hydraulic elevator includes a car, a hydraulic jack, and a hydraulic power unit. The hydraulic power unit and the hydraulic jack raise and lower the car. The hydraulic power unit supplies hydraulic oil to the hydraulic jack. The hydraulic power unit is disclosed in, for example, Patent Document 1.

[0004] The hydraulic power unit disclosed in Patent Document 1 includes a frame mounted on a lower base, an oil tank located on top of the frame, a hydraulic pump that pumps hydraulic oil from the oil tank, and a motor that drives the hydraulic pump. The hydraulic pump and motor are mounted on a single base (hereinafter referred to as the "pump base"). The pump base is mounted on the lower base.

[0005] The hydraulic pump and motor are fixed to a pump base as a pump assembly and are transported to a building where a hydraulic power unit is to be installed. Workers then carry the pump base that has been transported to the building to the installation site of the hydraulic power unit. For this reason, there is a demand for a lightweight pump assembly. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2023-176062 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the hydraulic power unit disclosed in Patent Document 1, the pump base is placed on the lower base via vibration-isolating rubber. The pump base is supported at several points where the vibration-isolating rubber is arranged (for example, four-point support). Therefore, conventional pump bases are formed using a metal material with a sufficient thickness to ensure rigidity. As a result, it has been difficult to reduce the weight of the pump base and pump assembly.

[0008] In consideration of the above problems, an object of the present invention is to provide a hydraulic power unit and a hydraulic elevator that can reduce the weight of the pump base. [Means for solving the problem]

[0009] To solve the above problems and achieve the object of the present invention, a hydraulic power unit embodying one aspect of the present invention includes a hydraulic pump, a motor, a pump base, a lower base, and a plurality of vibration-isolating members. The motor drives the hydraulic pump. The pump base supports the hydraulic pump and the motor. The pump base is fixed to the lower base. The plurality of vibration-isolating members are interposed between the lower base and an installation stand disposed at an installation location. A hydraulic elevator embodying one aspect of the present invention includes a car, a hydraulic jack for raising and lowering the car, and the above-described hydraulic power unit for supplying hydraulic oil to the hydraulic jack. [Effects of the Invention]

[0010] According to the hydraulic power unit and hydraulic elevator having the above configuration, the weight of the pump base can be reduced. Problems, configurations, and effects other than those described above will become clear from the following description of the embodiments. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic configuration diagram of a hydraulic elevator according to one embodiment. [Figure 2] FIG. 2 is a front view of the control panel-integrated hydraulic power unit according to the embodiment. [Figure 3] FIG. 2 is a plan view of a control panel-integrated hydraulic power unit according to one embodiment with an oil tank and a regenerative resistor removed. [Figure 4] FIG. 2 is a left side view of the control panel-integrated hydraulic power unit according to the embodiment. [Figure 5] FIG. 2 is a right side view of the control panel-integrated hydraulic power unit according to the embodiment. [Figure 6] FIG. 1 is a front view of a hydraulic power unit according to one embodiment. [Figure 7] FIG. 1 is a front view of a motor assembly according to an embodiment with a handle attached thereto. [Figure 8] FIG. 10 is a left side view of the motor assembly according to the embodiment with the handle attached. [Figure 9] FIG. 2 is a side view showing a state in which the muffler according to the embodiment is attached to a frame. [Figure 10] FIG. 2 is a plan view showing a state in which the muffler according to the embodiment is attached to a frame. [Figure 11] 1A and 1B are diagrams illustrating a connecting base and a plurality of vibration-isolating members according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functions or configurations are designated by the same reference numerals, and redundant description will be omitted.

[0013] [Configuration of hydraulic elevator] First, the configuration of the hydraulic elevator according to this embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram of a hydraulic elevator according to this embodiment.

[0014] As shown in Figure 1, the hydraulic elevator 1 includes a car 2, a hydraulic jack 3, a control panel-integrated hydraulic power unit 4, a pulley 5, and a rope 6. The control panel-integrated hydraulic power unit 4 includes a hydraulic power unit 11, a control panel 12, and a regenerative resistor 13.

[0015] The hydraulic power unit 11 supplies hydraulic oil to the hydraulic jack 3. The hydraulic power unit 11 also recovers hydraulic oil from the hydraulic jack 3. A control panel 12 controls the driving of the hydraulic power unit 11. A regenerative resistor 13 converts surplus energy of the hydraulic power unit 11 into thermal energy.

[0016] The hydraulic jack 3 has a plunger 3a and a cylinder 3b. The cylinder 3b moves the plunger 3a up and down depending on the amount of hydraulic oil sent from the hydraulic power unit 11. The plunger 3a supports the pulley 5 so that it can rotate.

[0017] The rope 6 is wound around the pulley 5. One end of the rope 6 is connected to the car 2. The other end of the rope 6 is fixed to the bottom of the building (of the elevator shaft). When the plunger 3a of the hydraulic jack 3 moves up and down, the pulley 5 moves up and down. As a result, the car 2 rises and falls via the rope 6 wound around the pulley 5.

[0018] In addition, the hydraulic elevator according to the present invention may be one in which the plunger of the hydraulic jack supports the car.

[0019] [Hydraulic power unit with integrated control panel] Next, the configuration of the control panel-integrated hydraulic power unit will be described with reference to FIGS. Fig. 2 is a front view of the control panel-integrated hydraulic power unit 4. Fig. 3 is a plan view of the control panel-integrated hydraulic power unit 4 with the oil tank and regenerative resistor 13 removed. Fig. 4 is a left side view of the control panel-integrated hydraulic power unit 4. Fig. 5 is a right side view of the control panel-integrated hydraulic power unit 4.

[0020] 1 to 5, the control panel-integrated hydraulic power unit 4 includes a hydraulic power unit 11, a control panel 12, and a regenerative resistor 13. Hereinafter, the front-rear, up-down, and left-right directions are defined as viewed from a person standing in front of the control panel-integrated hydraulic power unit 4. That is, as viewed from a person standing in front of the control panel-integrated hydraulic power unit 4, the near side is the front, the far side is the rear, the upper side is the top, the lower side is the bottom, the left side is the left side, and the right side is the right side.

[0021] An installation stand 101 is installed in advance at the installation location. The hydraulic power unit 11 and the control panel 12 are placed on the installation stand 101 via a connecting base 15. If it is possible to install the hydraulic power unit 11 and the control panel 12 directly on the installation stand 101, the connecting base 15 can be omitted. If the installation stand 101 does not have enough fixing points for the hydraulic power unit 11 and the control panel 12, the connecting base 15 is fixed to the upper surface of the installation stand 101, and the hydraulic power unit 11 and the control panel 12 are fixed to the connecting base 15.

[0022] The hydraulic power unit 11 and the control panel 12 are adjacent to each other in the front-to-rear direction. The hydraulic power unit 11 is located in front of the control panel 12. The control panel 12 is formed in a generally rectangular parallelepiped shape that is long in the vertical direction. The vertical length of the control panel 12 is longer than the vertical length of the hydraulic power unit 11.

[0023] The regenerative resistor 13 is attached to the front-facing surface of the control panel 12. The regenerative resistor 13 is formed in a roughly rectangular parallelepiped shape that is long in the vertical direction. The regenerative resistor 13 does not interfere with the hydraulic power unit 11. The top surface of the regenerative resistor 13 is lower than the top surface of the control panel 12. In other words, the regenerative resistor 13 is positioned so that it does not interfere with the hydraulic power unit 11 and does not protrude above the control panel 12.

[0024] The control panel 12 has an inverter circuit that drives the motor 25 (described later) of the hydraulic power unit 11. When the motor 25 is decelerated, a load is applied to the motor 25. This may cause the motor 25 to perform regenerative operation and function as a generator. As a result, the voltage applied to the inverter circuit increases. The regenerative resistor 13 consumes power to protect the inverter circuit and other components from overvoltage. At this time, the regenerative resistor 13 generates heat. The regenerative resistor 13 releases the generated heat into the air.

[0025] [Hydraulic power unit] Next, the configuration of the hydraulic power unit 11 will be described with reference to FIG. FIG. 6 is a front view of the hydraulic power unit 11.

[0026] As shown in FIG. 6, the hydraulic power unit 11 includes a frame 21, a lower base 22, an oil tank 23, a hydraulic pump 24, a motor 25, a control valve 26, and a muffler 27.

[0027] The frame 21 has an upper frame portion 211 and four support columns 212. The upper frame portion 211 and the four support columns 212 are formed, for example, from equal-leg angle iron. When viewed from the top-bottom direction, the upper frame portion 211 is formed into a rectangular frame shape that is long in the left-right direction. The four support columns 212 extend in the top-bottom direction. The upper ends of the four support columns 212 are connected to the four corners of the upper frame portion 211. A hydraulic pump 24, a motor 25, a control valve 26, and a muffler 27 are housed inside the frame 21.

[0028] The lower base 22 is formed, for example, from C-section steel. When viewed from the top-bottom direction, the lower base 22 is formed into a rectangular frame shape that is long in the left-right direction. The lower base 22 is set to have a frame shape that is approximately the same size as the upper frame portion 211 of the frame 21. The lower base 22 faces the upper frame portion 211 of the frame 21 in the top-bottom direction. The lower ends of the four support portions 212 of the frame 21 are connected to the four corners of the lower base 22.

[0029] The oil tank 23 is supported by the upper frame portion 211 of the frame 21. That is, the oil tank 23 is placed on the upper surface of the frame 21. Hydraulic oil is stored inside the oil tank 23. The oil tank 23 occupies an area above the frame 21, from the left end to the center. The area above the right end of the frame 21 is left as a space for arranging the regenerative resistor 13 (see FIG. 2).

[0030] In conventional hydraulic power units, the oil tank and muffler are mounted on top of the frame. As a result, the upper right-hand area of ​​the frame is occupied by the muffler. Therefore, conventional regenerative resistors are placed on top of the control panel. As a result, conventional regenerative resistors prevent the control panel-integrated hydraulic power unit from being made more compact in height.

[0031] On the other hand, in the hydraulic power unit 11 of this embodiment, the muffler 27 is disposed inside the frame 21, so an area on the right end side above the frame 21 can be freed up. This allows the hydraulic power unit 11 to be made smaller. The regenerative resistor 13 is attached to the front-facing surface of the control panel 12, and is disposed in an area on the right end side above the frame 21. As a result, the control panel-integrated hydraulic power unit 4 can be made smaller in height.

[0032] The hydraulic pump 24, the motor 25, and the control valve 26 are supported on the lower base 22 via a pump base 31. The pump base 31 supports the hydraulic pump 24, the motor 25, and the control valve 26. The pump base 31 is fixed to the lower base 22 using screws.

[0033] The pump base 31 has a rectangular shape that is long in the left-right direction when viewed from the top-bottom direction, and is formed like a thin box with an open top. The pump base 31 faces the oil tank 23 and the control valve 26 in the top-bottom direction. This allows the pump base 31 to receive hydraulic oil if it leaks from the oil tank 23, the hydraulic pump 24, or the control valve 26. As a result, the leaked hydraulic oil will not leak below the pump base 31.

[0034] The hydraulic pump 24 and the motor 25 are fixed to a pump base 31 at a manufacturing factory. Hereinafter, the hydraulic pump 24 and the motor 25 fixed to the pump base 31 will be referred to as a pump assembly 30 (see FIG. 7). The pump assembly 30 is carried into a building where the hydraulic power unit 11 will be installed.

[0035] The hydraulic pump 24 and the control valve 26 are fixed to the pump base 31 via a pump bracket 35. The control valve 26 is not included in the above-mentioned pump assembly 30 (see FIG. 7). The control valve 26 is fixed to the pump bracket 35 at the installation location of the hydraulic power unit 11.

[0036] The hydraulic pump 24 and the control valve 26 are located below the oil tank 23. The hydraulic pump 24 is connected to the oil tank 23 via a pipe 41. The hydraulic pump 24 is also connected to the control valve 26 via a pipe 42 (see FIG. 6). The control valve 26 is connected to the oil tank 23 via a pipe 43.

[0037] The motor 25 is fixed to the pump base 31 using screws. The motor 25 faces the hydraulic pump 24 in the left-right direction. The hydraulic pump 24 and the motor 25 are arranged coaxially. The rotating shaft of the hydraulic pump 24 and the drive shaft of the motor 25 are connected in series using a coupling 36.

[0038] The rotary shaft of the hydraulic pump 24 and the drive shaft of the motor 25 are connected when the pump assembly 30 is assembled in a manufacturing factory. Therefore, there is no need for an operator to adjust the positions of the hydraulic pump 24 and the motor 25 in order to connect the shafts at the installation site of the hydraulic power unit 11. This simplifies the installation work of the hydraulic power unit 11.

[0039] The muffler 27 is attached to the upper frame portion 211 of the frame 21 via a muffler bracket 37. The muffler 27 faces the control valve 26 in the left-right direction. The muffler 27 is connected to the control valve 26 via a pipe 44. A check valve 28 is attached to the pipe 44. Furthermore, the muffler 27 is connected to the hydraulic jack 3 (see FIG. 1) via a pipe 45.

[0040] The motor 25 is controlled by the control panel 12 for forward rotation, reverse rotation, stopping, rotation speed, etc. When the motor 25 rotates forward, the hydraulic pump 24 connected by the coupling 36 rotates forward. This causes the hydraulic pump 24 to suck in and pressurize hydraulic oil from the oil tank 23 via piping 41. The hydraulic pump 24 then sends the pressurized hydraulic oil to the control valve 26 via piping 42.

[0041] Control valve 26 controls the flow rate of hydraulic oil sent by hydraulic pump 24. Then, hydraulic oil that passes through control valve 26 is sent to muffler 27 via piping 44. Control valve 26 also returns excess hydraulic oil that is generated when controlling the flow rate of hydraulic oil to oil tank 23 via piping 43. Muffler 27 absorbs pulsations of the hydraulic oil and stabilizes the pressure of the hydraulic oil. Hydraulic oil that passes through muffler 27 is supplied to hydraulic jack 3 (see Figure 1) via piping 45. This causes car 2 of hydraulic elevator 1 to rise.

[0042] On the other hand, when the motor 25 rotates in the reverse direction, the hydraulic pump 24 connected by the coupling 36 also rotates in the reverse direction. As a result, the hydraulic pump 24 sucks hydraulic oil from the hydraulic jack 3 via the muffler 27, piping 44, etc., and sends it to the oil tank 23. This causes the car 2 of the hydraulic elevator 1 to descend. When stopping the car 2, the control panel 12 shuts off the flow of hydraulic oil using the control valve 26 and stops the motor 25.

[0043] [Pump assembly] Next, the pump assembly 30 will be described with reference to FIGS. Fig. 7 is a front view of the pump assembly 30 with the handle attached. Fig. 8 is a left side view of the pump assembly 30 with the handle attached.

[0044] The pump assembly 30 is assembled in a manufacturing factory by fixing the hydraulic pump 24 and the motor 25 to the pump base 31. The pump assembly 30 is then transported to a building where the hydraulic power unit 11 will be installed. An operator carries the pump assembly 30 to the installation location of the hydraulic power unit 11.

[0045] The pump base 31 only needs to have the rigidity required for lifting and transporting the pump assembly 30. In other words, the pump base 31 does not need to have rigidity that can withstand the weight and vibration of the hydraulic pump 24 and motor 25, or rigidity that takes into account the weight of the control valve 26. This allows the pump base 31 and pump assembly 30 to be made lighter in weight.

[0046] 7 and 8, two carrying handles 32 are attached to the pump base 31 of the pump assembly 30. This allows an operator to easily hold the pump assembly 30.

[0047] Handle attachment portions are formed on the side walls that form the short sides of the pump base 31. Two carrying handles 32 are fixed to the handle attachment portions of the pump base 31 using screws. The two carrying handles 32 are removed from the pump base 31 after the pump assembly 30 is placed on the lower base 22.

[0048] The carrying handle 32 has a grip portion 321 and a plurality of connecting portions 322. The grip portion 321 is formed in a round bar shape extending along the short side of the pump base 31. The plurality of connecting portions 322 are formed in a round bar shape protruding radially from the outer circumferential surface of the grip portion 321. The tip portions of the plurality of connecting portions 322 are fixed to the side wall forming the short side of the pump base 31 using, for example, nuts.

[0049] As shown in Figure 8, the length of grip portion 321 is shorter than the length of the short side of pump base 31. As a result, grip portion 321 does not protrude in the front-to-rear direction from pump base 31. As a result, carrying handle 32 prevents pump assembly 30 from becoming too large when transported. As a result, pump assembly 30 can be transported through any passageway that is wider than the length of the short side of pump base 31.

[0050] [Pump bracket] Next, the configuration of the pump bracket 35 will be described with reference to FIG.

[0051] The pump bracket 35 is formed into a substantially rectangular frame shape when viewed from the side (front-to-rear direction). The lower frame piece of the pump bracket 35 is fixed to the pump base 31 with screws. The hydraulic pump 24 is fixed to the right frame piece of the pump bracket 35 with screws. The control valve 26 is fixed to the upper frame piece of the pump bracket 35 with screws.

[0052] 7, the pump bracket 35 has a first bracket member 351 and a second bracket member 352. The first bracket member 351 and the second bracket member 352 are formed by bending a metal plate into a substantially C-shape.

[0053] The first bracket member 351 forms the bottom, right, and left frame pieces of the pump bracket 35. The second bracket member 352 forms the top, left, and right frame pieces of the pump bracket 35. The first bracket member 351 and the second bracket member 352 are connected to each other at the left and right frame pieces of the pump bracket 35 using screws.

[0054] Conventional pump brackets have a generally C-shaped configuration when viewed from the side (front-to-rear). Conventional pump brackets have reinforcing ribs attached to the upper corners to support the control valve. In contrast, pump bracket 35 according to this embodiment is formed in a generally rectangular frame shape, ensuring sufficient rigidity to support control valve 26 without having to attach reinforcing ribs to the upper corners. Furthermore, because pump bracket 35 does not require reinforcing ribs, it can be made lighter than conventional pump brackets.

[0055] [Muffler bracket] Next, the position adjustment of the muffler bracket 37 and the muffler 27 will be described with reference to FIGS. Fig. 9 is a side view showing a state in which muffler 27 is attached to the frame. Fig. 10 is a plan view showing a state in which muffler 27 is attached to frame 21.

[0056] 9 and 10, the muffler bracket 37 is made up of a pair of bracket members 37A and 37B. The pair of bracket members 37A and 37B are made by bending a metal plate into an L shape. The pair of bracket members 37A and 37B face each other in the front-rear direction.

[0057] Each of the pair of bracket members 37A, 37B has a fixing piece 371 and a support piece 372. The fixing piece 371 is a plate having a flat surface that is approximately perpendicular to the up-down direction. The fixing piece 371 is formed in a rectangular shape that is long in the left-right direction. The fixing piece 371 is fixed to the top surface of the upper frame portion 211 of the frame 21 using muffler bracket screws 47.

[0058] The support piece 372 is a plate having a flat surface that is approximately perpendicular to the front-rear direction. The support piece 372 extends downward from one long side of the fixing piece 371. The support pieces 372 of the pair of bracket members 37A, 37B face each other at a predetermined distance in the front-rear direction. A plurality of fixing portions 271 (described later) of the muffler 27 are fixed to the support piece 372 using screws.

[0059] Muffler 27 is formed in a generally cylindrical shape extending in the left-right direction. Muffler 27 has a plurality of fixing portions 271. The fixing portions 271 are lined up at appropriate intervals in the left-right direction (see FIG. 10). The fixing portions 271 are formed in a generally C-shape when viewed from the left-right direction.

[0060] The multiple fixing portions 271 each have two fixing pieces 271a and a connecting piece 271b. The two fixing pieces 271a face each other in the front-to-rear direction. The two fixing pieces 271a are made of plates having flat surfaces that are approximately perpendicular to the front-to-rear direction and extend in the up-down direction. The connecting piece 271b is made of a plate having a flat surface that is approximately perpendicular to the up-to-down direction and is continuous with the upper parts of the two fixing pieces 271a.

[0061] The lower ends of the two fixing pieces 271a are curved along the outer peripheral surface of the muffler 27. The lower ends of the two fixing pieces 271a are fixed to the outer peripheral surface of the muffler 27 by welding or using screws. The upper ends of the two fixing pieces 271a are fixed to the support pieces 372 of the pair of bracket members 37A, 37B by using fixing portion screws 48.

[0062] The multiple fixing portions 271 are bridged across the pair of bracket members 37A, 37B. As a result, the multiple fixing portions 271 function as reinforcing portions for the pair of bracket members 37A, 37B, and increase the rigidity of the pair of bracket members 37A, 37B. This makes it possible to reduce the weight of the pair of bracket members 37A, 37B (muffler bracket 37).

[0063] The connecting piece 271b faces the upper part of the muffler 27 at an appropriate distance. The connecting piece 271b is used as a handle when gripping the muffler 27. This allows the operator to grip the muffler 27 easily and stably.

[0064] In this way, the multiple fixing portions 271 serve both as reinforcing portions for the pair of bracket members 37A, 37B and as handles for gripping the muffler 27. As a result, employing the multiple fixing portions 271 can reduce the number of parts in the hydraulic power unit 11 compared to when reinforcing portions and handles are provided separately.

[0065] Each of the two fixing pieces 271a of the multiple fixing portions 271 has a screw through-hole (not shown) through which the fixing portion screw 48 passes horizontally. This screw through-hole is formed as an elongated hole that is long in the vertical direction. This allows the worker to easily adjust the vertical position of the muffler 27. Note that the screw through-hole through which the fixing portion screw 48 passes is not limited to an elongated hole, and may be a round hole that allows the vertical position of the muffler 27 to be adjusted.

[0066] The support pieces 372 of the pair of bracket members 37A, 37B have screw through holes (not shown) through which the muffler bracket screws 47 pass in the vertical direction. These screw through holes are set as round holes of a size that allows the horizontal position of the pair of bracket members 37A, 37B (muffler brackets 37) to be adjusted. This allows the operator to adjust the horizontal position of the muffler 27.

[0067] A slider 38 is interposed between the support pieces 372 of the pair of bracket members 37A, 37B and the upper frame portion 211 of the frame 21. The slider 38 is formed, for example, from a resin in the shape of a thin plate. The slider 38 has a smaller coefficient of friction than the support pieces 372. The slider 38 may be made, for example, from a polyamide synthetic resin.

[0068] When installing the muffler 27 in the frame 21, the worker first temporarily fixes the pair of bracket members 37A, 37B, to which the muffler 27 is connected, to the upper frame portion 211. At this time, the worker interposes the slider 38 between the support piece 372 and the upper frame portion 211. This makes it easier for the pair of bracket members 37A, 37B to slide on the upper frame portion 211 of the frame 21.

[0069] Next, the worker uses a tool such as a hammer to hit the pair of bracket members 37A, 37B and the plurality of fixing portions 271 to adjust the position of muffler 27. As a result, the worker can easily adjust the horizontal position of muffler 27.

[0070] [Vibration-proof structure of hydraulic power unit] Next, the vibration isolation structure of the hydraulic power unit 11 will be described with reference to FIGS. FIG. 11 is a diagram showing the connecting base 15 and a plurality of vibration-isolating members 29. As shown in FIG.

[0071] As shown in Fig. 2, a plurality of vibration-isolating members 29 are interposed between the lower base 22 of the hydraulic power unit 11 and the connecting base 15. As shown in Fig. 11, the lower surfaces of the plurality of vibration-isolating members 29 are fixed to the upper surface of the connecting base 15 using screws. The upper surfaces of the plurality of vibration-isolating members 29 are fixed to the lower surface of the lower base 22 using screws. This makes it possible to suppress vibration of the hydraulic power unit 11 caused by the driving of the motor 25 and the hydraulic pump 24.

[0072] The pump base 31, to which the motor 25 and hydraulic pump 24 are fixed, is in surface contact with the lower base 22. As a result, the pump base 31 and the lower base 22, when integrated, ensure sufficient rigidity to withstand the weight and vibration of the hydraulic pump 24 and motor 25. In other words, the pump base 31 does not need to ensure sufficient rigidity to withstand the weight and vibration of the hydraulic pump 24 and motor 25 on its own. This allows the pump base 31 to be made lighter.

[0073] The weight of the pump base 31 can be reduced, for example, by reducing the thickness of the metal plate that is the material for the pump base 31 or by eliminating the reinforcing ribs. By reducing the weight of the pump base 31, the weight of the pump assembly 30 can be reduced. In this way, the hydraulic power unit 11 of this embodiment can reduce the weight of the pump assembly 30 while suppressing vibrations.

[0074] [summary] (1) The above-described hydraulic power unit 11 includes a hydraulic pump 24, a motor 25, a pump base 31, a lower base 22, and a plurality of vibration-isolating members 29. The motor 25 drives the hydraulic pump 24. The pump base 31 supports the hydraulic pump 24 and the motor 25. The pump base 31 is fixed to the lower base 22. The plurality of vibration-isolating members 29 are interposed between the lower base 22 and an installation stand disposed at the installation location. This allows the pump base 31 and the lower base 22, when integrated together, to have sufficient rigidity to withstand the weight and vibrations of the hydraulic pump 24 and the motor 25. As a result, the hydraulic power unit 11 can reduce the weight of the pump base 31 while suppressing vibrations.

[0075] (2) The pump base 31 is formed in a box shape with an open top. This allows the pump base 31 to receive hydraulic oil when it leaks from the oil tank 23, the hydraulic pump 24, etc. As a result, the leaked hydraulic oil can be prevented from leaking below the pump base 31.

[0076] (3) The pump base 31 described above has a handle attachment portion for detachably attaching the carrying handle 32. This allows the operator to easily grasp the pump base 31 (pump assembly 30) that supports the hydraulic pump 24 and the motor 25.

[0077] (4) The pump base 31 has a rectangular shape when viewed from above, and the handle attachment portions are formed on the side walls that define the two short sides of the pump base 31. This allows a relatively small space to be required in a direction parallel to the short side of the pump base 31 when an operator carries the pump base 31 (pump assembly 30) that supports the hydraulic pump 24 and the motor 25. As a result, the pump assembly 30 can be carried in even to an installation location where it is necessary to pass through a narrow passage.

[0078] (5) The above-described hydraulic power unit 11 includes a control valve 26 and a pump bracket 35. The control valve 26 controls the flow rate of hydraulic oil sent by the hydraulic pump 24. The pump bracket 35 is fixed to the pump base 31 and supports the hydraulic pump 24 and the control valve 26. The pump bracket 35 is formed in a substantially rectangular frame shape when viewed from the side. This allows the pump bracket 35 to be lightweight while ensuring the rigidity required to support the control valve 26. As a result, the weight of the pump assembly 30 can be reduced.

[0079] (6) The hydraulic power unit 11 described above includes the connecting base 15 interposed between the plurality of vibration-isolating members 29 and the installation base 101 . This means that, for example, when replacing a hydraulic power unit, even if the existing installation base 101 cannot secure a fixing point for the hydraulic power unit 11, the hydraulic power unit 11 can be fixed to the installation base 101 via the connecting base 15.

[0080] The above describes the embodiments of the present invention, including their effects. However, the hydraulic power unit and hydraulic elevator of the present invention are not limited to the above-described embodiments, and various modifications are possible within the scope of the invention as defined in the claims.

[0081] Furthermore, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the configurations described. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with another configuration.

[0082] In this specification, the words "parallel," "vertical," and "orthogonal" are used, but these do not mean only the strict "parallel," "vertical," and "orthogonal" states, but also include "parallel," "vertical," and "orthogonal," and may also mean "approximately parallel," "approximately vertical," or "approximately orthogonal" states within a range in which the respective functions can be exerted. [Explanation of symbols]

[0083] 1...hydraulic elevator, 2...car, 3...hydraulic jack, 3a...plunger, 3b...cylinder, 4...hydraulic power unit integrated with control panel, 5...pulley, 6...rope, 11...hydraulic power unit, 12...control panel, 13...regenerative resistor, 15...connection base, 21...frame, 22...lower base, 23...oil tank, 24...hydraulic pump, 25...motor, 26...control valve, 27...muffler, 28...check valve, 29...vibration-damping member, 30...pump assembly, 31...pump base, 32...transport handle, 35...pump bracket, 36...coupling, 37...muffler bracket, 37A, 37B...bracket member, 38...slider, 41, 42, 43, 44, 45...piping, 101...installation base, 211...Upper frame portion, 212...Support portion, 271...Fixing portion, 321...Holding portion, 322...Connecting portion, 351...First bracket member, 352...Second bracket member, 371...Fixing piece, 372...Support piece

Claims

1. A hydraulic pump, a motor that drives the hydraulic pump; a pump base supporting the hydraulic pump and the motor; a lower base to which the pump base is fixed; a plurality of vibration-isolating members interposed between the lower base and an installation table disposed at an installation location; Hydraulic power unit.

2. The pump base is formed in a box shape with an open top. The hydraulic power unit according to claim 1 .

3. The pump base has a handle attachment portion for detachably attaching a carrying handle.

3. The hydraulic power unit according to claim 1 or 2.

4. The pump base has a rectangular shape when viewed from above and below, The handle attachment portions are formed on the side walls that define the two short sides of the pump base. The hydraulic power unit according to claim 3 .

5. a control valve for controlling the flow rate of hydraulic oil sent by the hydraulic pump; a pump bracket fixed to the pump base and supporting the hydraulic pump and the control valve; The pump bracket is formed in a substantially rectangular frame shape when viewed from the side. The hydraulic power unit according to claim 1 .

6. The vibration isolating member further includes a connecting base interposed between the vibration isolating members and the installation base. The hydraulic power unit according to claim 1 .

7. A car, a hydraulic jack for raising and lowering the car; a hydraulic power unit that supplies hydraulic oil to the hydraulic jack, The hydraulic power unit comprises: A hydraulic pump, a motor that drives the hydraulic pump; a pump base on which the hydraulic pump and the motor are mounted; a lower base to which the pump base is fixed; a plurality of vibration-isolating members interposed between the lower base and an installation table disposed at an installation location; Hydraulic elevator.

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