KR20230153546A - l-in-one hydraulic cylinder - Google Patents

Abstract

The present invention relates to an integrated hydraulic drive unit, particularly a hydraulic controller in which an AC electric motor, hydraulic pump, valve, oil tank and housing are integrated; This relates to an integrated hydraulic drive unit that has a cylinder connected to be operated by a hydraulic controller, which not only reduces driving noise and the number of parts, but also improves lifespan and power.
The integrated hydraulic drive unit 1000 of the present invention includes a hydraulic cylinder 1100, an electric motor capable of rotating in the forward and reverse directions, and rotation of the electric motor to deliver hydraulic oil in the forward and reverse directions under a predetermined pressure. It includes a hydraulic pump 1220, an oil tank 1230 for storing hydraulic oil in a closed space, and a valve unit 1240 for controlling the flow of hydraulic oil in the forward and reverse directions between the oil tank and the hydraulic cylinder. A hydraulic controller 1200 is provided, wherein the electric motor is an AC electric motor 1210, and an electric motor housing 1211 accommodating the AC electric motor is provided.

Description

All-in-one hydraulic drive unit {l-in-one hydraulic cylinder}

The present invention relates to an integrated hydraulic drive unit, and more specifically, to an integrated hydraulic drive unit that can reduce driving noise and the number of parts, as well as improve lifespan and power.

In cases where only a conventional power source exists, hydraulic drive units have been used that can easily provide driving force created by oil pressure without arranging hydraulic pipes. For example, it has been used to lift the equipment of special agricultural vehicles on farmland, and is expected to have industrial applications in various fields in the future.

Here, the hydraulic drive unit generally consists of an actuator (generally used as a “hydraulic cylinder”) and a hydraulic controller to operate the actuator (expand and contract in the case of a hydraulic cylinder). The hydraulic controller includes an electric motor that can rotate in the forward and reverse directions, a hydraulic pump that can deliver hydraulic oil in the forward and reverse directions under a predetermined pressure by rotation of the electric motor, and an oil tank for storing hydraulic oil in a closed space. , a valve for controlling the flow of hydraulic oil in the forward and reverse directions, and a housing (referred to as a body block) that houses the hydraulic pump, the valve, etc. and has an oil path formed therein.

Known Japanese Patent Publication No. 11-29345 discloses a block-shaped housing in which one of the bottom portions (single bottom portion) is formed as a motor connection portion. When the electric motor is connected to the motor connection, the output shaft of the electric motor is fitted into a hole (joint hole) formed in the housing, and the output shaft is connected to the drive shaft of the hydraulic pump.

However, in a configuration in which the output shaft of the electric motor is fitted into a hole formed in the housing and connected to the drive shaft of the hydraulic pump, both the joint where the electric motor is connected to the housing and the joint where the hydraulic pump is connected to the housing are highly sophisticated. It must be assembled with precision. Otherwise, since the output shaft of the electric motor is later connected to the drive shaft of the hydraulic pump, the rotation center is not aligned, which causes noise when the motor and pump are driven, and inappropriate force is applied internally. This ultimately has the drawback of shortening the service life of the assembly. In addition, it is difficult to reduce the number of parts of the hydraulic drive unit, and therefore difficult to reduce manufacturing costs. In addition, when an electric motor housing is provided to accommodate an electric motor, there is a hydraulic pump housing and valves for installing a hydraulic pump, and due to the configuration of connecting these elements to each other, the valve housing accommodating the valves is separated. As it is manufactured, manufacturing costs increase and there are also limitations in reducing the number of parts.

In this regard, Japanese Patent Publication No. 9-58438 discloses a configuration in which an electric motor housing and a hydraulic pump housing are formed integrally. However, in this case, the valve housing housing the valves, unlike the hydraulic pump unit, is not constructed as one piece.

In order to solve the above-mentioned problems, the invention of Korean Patent No. 10-1330724, titled "Hydraulic controller and hydraulic drive unit equipped with this hydraulic controller," is known, which can reduce driving noise and reduce the number of parts. A hydraulic controller whose lifespan can be extended and a hydraulic drive unit equipped with the hydraulic controller are disclosed. A hydraulic controller for a hydraulic drive unit includes an electric motor housing configured to accommodate an electric motor, a hydraulic pump housing configured to accommodate a hydraulic pump, and a valve housing configured to accommodate valves, including the electric motor housing, the hydraulic pump housing, and The valve housing includes a housing integrally formed.

Therefore, it can be used in all industrial fields, the driving force generated by oil pressure is given independently to the driven body, the lifespan is extended, miniaturization is possible, and low-cost manufacturing is possible.

However, since these hydraulic drive units use electric motors as direct current motors, their lifespan and power are reduced, so there is a problem in that they are not widely applied to tasks that require force.

Reference: Republic of Korea Patent No. 10-1330724 Invention Title: “Hydraulic Controller and Hydraulic Drive Unit Equipped with the Hydraulic Controller”.

The present invention was developed to solve the above-mentioned requirements, and includes a hydraulic controller integrated with an AC electric motor, hydraulic pump, valve, oil tank, and housing; The purpose is to provide an integrated hydraulic drive unit that is equipped with a hydraulic cylinder connected to be operated by a hydraulic controller, which not only reduces driving noise and the number of parts, but also improves lifespan and power.

The integrated hydraulic drive unit according to the present invention to achieve the above object includes a hydraulic cylinder, an electric motor capable of rotating in the forward and reverse directions, and the rotation of the electric motor sends hydraulic oil in the forward and reverse directions under a predetermined pressure. It is equipped with a hydraulic pump that can operate, an oil tank for storing hydraulic oil in a closed space, and a hydraulic controller including a valve unit to control the flow of hydraulic oil in the forward and reverse directions between the oil tank and the hydraulic cylinder, The electric motor is an AC electric motor, and is characterized in that it is provided with an electric motor housing to accommodate the AC electric motor.

In addition, the AC electric motor is further equipped with a protection circuit to protect the magnet during forward and reverse rotation.

In addition, a control unit for controlling the flow rate of the hydraulic pump is further connected and installed.

Meanwhile, the oil tank is characterized in that a screw groove is formed through the axis center of the side on which the pump is not assembled, and a plug is detachably fastened to the screw groove so as to selectively close the screw groove.

In addition, the hydraulic cylinder is fixed via a cylinder installation bracket fixed to the upper surface of the center block constituting the valve, and the cylinder installation bracket includes a base surface that is in close contact with the upper surface of the center block and is sealed, and the base. A plurality of through holes are formed at both ends of the surface so that the cylinder installation bracket can be fixed with a fastening member, and the lower part of the hydraulic cylinder is formed between the through holes so that the lower part of the hydraulic cylinder is partially inserted and seated, and the AC electric motor, pump, and oil It is characterized by having a hydraulic cylinder locking groove in which the hydraulic cylinder is installed parallel to the direction in which the tank is assembled.

As described above, according to the integrated hydraulic drive unit according to the present invention, a hydraulic controller including an AC electric motor, a hydraulic pump, a valve, an oil tank, and a housing are integrated; Equipped with a hydraulic cylinder connected to be operated by this hydraulic controller, not only can driving noise and the number of parts be reduced, but also the lifespan and power can be improved.

1 is a perspective view showing an integrated hydraulic drive unit according to an embodiment of the present invention;
Figure 2 is a front view of Figure 1,
Figure 3 is a plan view of Figure 1;
Figure 4 is a right side view of Figure 1;
Figure 5 is an exploded perspective view of Figure 1;
Figure 6 is a half cross-sectional view illustrating the tank of Figure 1;
Figure 7 is a hydraulic circuit diagram showing the basic configuration of a hydraulic drive unit used in a hydraulic cylinder according to an embodiment of the present invention.

Hereinafter, an integrated hydraulic drive unit according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

In adding quotation marks to the components of the drawings, the same components are given the same symbols as much as possible even if they are shown in different drawings, a known function that is judged to unnecessarily obscure the gist of the present invention. and detailed description of the configuration is omitted. Additionally, directional terms such as 'top', 'bottom', 'front', 'back', 'front', 'front', 'back', etc. are used in connection with the orientation of the disclosed drawing(s). Since components of embodiments of the present invention can be positioned in various orientations, the term directional is used for illustrative purposes and is not limiting.

The integrated hydraulic drive unit 1000 according to an embodiment of the present invention includes a hydraulic cylinder 1100 and a hydraulic controller 1200, as shown in FIGS. 1 to 7.

Here, the hydraulic cylinder 1100 includes a cylinder 1110 with one end of the fixing part 1111 in which a fixing hole 1111a is formed and a rod 1112 that floats to the other end by the supplied fluid, and a lower part of this cylinder. It consists of a cylinder installation bracket 1120 that is fitted and fixed to the upper surface of the hydraulic controller 1200.

Therefore, the cylinder 1110 is fixed to the upper part of the center block constituting the hydraulic controller 1200 via the cylinder installation bracket 1120.

And to describe the cylinder installation bracket 1120 in more detail, it includes a base surface 1121 that is in close contact with the upper surface of the center block and is sealed, and a fastening member such as a bolt that is formed through penetrating surfaces at both ends of the base surface. A plurality of through holes 1122 are formed for fixation, and the lower part of the cylinder 1110 is partially inserted and formed between the through holes at both ends, and the assembly of the AC electric motor, pump, and oil tank. It is equipped with a cylinder locking groove (1123) that allows the cylinder to be installed parallel to the direction in which it is installed.

Accordingly, the cylinder 1110 is inserted into the cylinder locking groove 1123 of the cylinder installation bracket 1120 fixed to the center block, is seated parallel to the hydraulic controller 1200, and is compactly assembled.

In addition, the hydraulic controller 1200 includes an AC electric motor 1210 that can rotate in the forward and reverse directions, and a hydraulic pump 1220 that can deliver hydraulic oil in the forward and reverse directions under a predetermined pressure by rotating the AC electric motor. , and an oil tank 1230 for storing hydraulic oil in a closed space, and a valve unit 1240 for controlling the flow of hydraulic oil in the forward and reverse directions between the oil tank and the hydraulic cylinder 1100. .

Therefore, by using the AC electric motor 1210, the power of the hydraulic pump 1220 becomes much larger compared to when using a DC electric motor, making it easy to apply to various industrial sites, as well as the AC electric motor ( 1210), the hydraulic pump 1220, the oil tank 1230, and the valve unit 1240 are assembled in a straight line and parallel to the hydraulic cylinder 1100, enabling a very compact configuration.

Meanwhile, the AC electric motor 1210 is accommodated and assembled in an electric motor housing 1211, and the AC electric motor 1210 further includes a protection circuit unit 1212 to protect the magnet of the motor during forward and reverse rotation. It is provided.

Therefore, not only can the AC electric motor 1210 be safely assembled by the electric motor housing 1211, but the magnet of the motor is protected from overheating by the protection circuit unit 1212.

In addition, the hydraulic pump 1220 is assembled on one side of the valve unit 1240 and is assembled to be accommodated in the oil tank 1230, and a control unit (not shown) for controlling the flow rate is connected and installed. desirable.

Therefore, the hydraulic pump 1220, which operates via the AC electric motor 1210, pressurizes the oil contained inside the oil tank 1230 to the valve unit 1240 and sends it to the hydraulic cylinder 1100, thereby causing the rod to appear. .

Meanwhile, the oil tank 1230 is provided with a flange 1231 on the side where the hydraulic pump 1220 is assembled, and a screw groove 1232 is formed through the center of the axis on the side where the hydraulic pump is not assembled. , a plug 1233 is detachably fastened to the screw groove 1232 so as to selectively close the screw groove.

Therefore, it is possible to assemble the hydraulic pump 1220 on the side of the valve part 1240 using the flange 1231, as well as to insert oil into the screw groove 1232 by unscrewing the plug 1233. Things that can be removed become easier.

In addition, the valve unit 1240 is a center block in which the electric motor housing 1211 is fixed on one side, the hydraulic pump 1220 and the oil tank 1230 are fixed on the other side, and the hydraulic cylinder 1100 is assembled on the upper side. (1241), a pressure regulator (BPR valve; 1242a), a pilot check valve (1242b), an emergency stop valve (1242c), an orifice (1242d), and a relief valve (1242e) assembled at a predetermined position of the center block. Valves 1242 are assembled.

Therefore, as shown in FIG. 7, the rotational force of the AC electric motor 1210 is transmitted to the hydraulic pump 1220 to pump the oil contained in the oil tank 1230 into the center block 1241 of the valve unit 1240. It is supplied to the hydraulic cylinder 1100 through which the rod 1112 appears.

In addition, the pressure regulator (BPR valve; 1242a) controls the pressure of oil flowing in from the hydraulic pump 1220 in a control unit (not shown), and the pilot check valve (1242b) controls oil in one direction while the pilot operates in one direction. It is a valve that supplies this, and the emergency stop valve (1242c) is installed to prevent this problem because abnormal operation occurs and becomes dangerous when hydraulic pressure is lost in the hydraulic control device, and the orifice (1242d) is installed in the valve portion (1240). ) is installed on the outlet side of the hydraulic line provided in the center block 1241 to supply oil to the hydraulic cylinder 1100, while the relief valve 1242e is installed to control the pressure of the oil pumped from the hydraulic pump 1220. If the pressure rises above this limit, the valve opens automatically to release the excess pressure.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters stated in the claims, and those skilled in the art can improve and change the technical idea of the present invention into various forms. Therefore, if such improvements and changes are obvious to a person of ordinary skill in the art, they will fall within the scope of protection of the present invention.

1000: Integrated hydraulic drive unit 1100: Hydraulic cylinder
1110: Cylinder 1111: Fixing part
1112: Rod 1120: Cylinder installation bracket
1121: base surface 1122: through hole
1123: Cylinder locking groove 1200: Hydraulic controller
1210: AC electric motor 1211: Electric motor housing
1222: Protection circuit unit 1220: Hydraulic pump
1230: Oil tank 1231: Flange
1232: Screw groove 1233: Plug
1240: Valve unit 1241: Center block

Claims (5)

A hydraulic cylinder (1100),
An electric motor that can rotate in the forward and reverse directions, a hydraulic pump that can deliver hydraulic oil in the forward and reverse directions under a predetermined pressure by the rotation of the electric motor, an oil tank for storing hydraulic oil in a closed space, and an oil tank. In the integrated hydraulic drive unit including a hydraulic controller 1200 including a valve unit for controlling the flow of hydraulic oil in the forward and reverse directions between the hydraulic cylinder,
The electric motor is an AC electric motor 1210,
An integrated hydraulic drive unit, characterized in that it is provided with an electric motor housing 1211 that accommodates the AC electric motor. According to clause 1,
An integrated hydraulic drive unit characterized in that the AC electric motor 1210 is further provided with a protection circuit part 1222 to protect the magnet during forward and reverse rotation. According to claim 1 or 2,
An integrated hydraulic drive unit, characterized in that a control unit for controlling the flow rate of the hydraulic pump (1220) is further connected and installed. According to claim 1 or 2,
The oil tank 1230 is,
A screw groove 1232 is formed through the axis center of the side on which the hydraulic pump 1220 is not assembled,
An integrated hydraulic drive unit, characterized in that a plug 1233 is detachably fastened to the screw groove 1232 so as to selectively close the screw groove. According to claim 1 or 2,
The hydraulic cylinder 1100 is
It is fixed via a cylinder installation bracket 1120 fixed to the upper surface of the center block 1241 constituting the valve unit 1240,
The cylinder installation bracket 1120 is,
A base surface 1121 that is in close contact with the upper surface of the center block 1241 and is sealed,
A plurality of through holes 1122 formed at both ends of the base surface to allow the cylinder installation bracket to be fixed with a fastening member,
In addition to being formed between the through holes 1122 so that the lower part of the cylinder 1110 is partially inserted and seated, the cylinder ( An integrated hydraulic drive unit characterized by having a hydraulic cylinder locking groove (1123) in which 1110) is installed.

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