KR101131876B1 - Hydraulic pump integrated electric motor - Google Patents

Abstract

The present invention relates to a motor-integrated hydraulic pump.
The motor-integrated hydraulic pump according to the present invention includes: an electric motor and a hydraulic pump formed on the same axis to form hydraulic pressure of hydraulic oil; A housing body defining a receiving space of the electric motor and the hydraulic pump, and a storage space of the hydraulic oil, and a circulation hole of the hydraulic oil in each of the inner partitions that partition or support the space; And an oil cooler formed at the rear end of the housing body to cool the hydraulic oil, and by hydraulic pressure of the hydraulic oil being drained and rotational operation of the motor, the hydraulic oil flows through the circulation hole and the entire area inside the housing body. It is characterized by circulating.
The motor-integrated hydraulic pump of the present invention has an improved cooling efficiency, which enables continuous operation for a long time, thereby maximizing operational effects, and the hydraulic oil can absorb noise, vibration, and heat generated by operation. Since it can be made compact, there is an effect that efficiency of installation space can be aimed at.

Description

HYDRAULIC PUMP INTEGRATED ELECTRIC MOTOR}

The present invention relates to a motor-integrated hydraulic pump.

In general, hydraulic power generators are widely used as auxiliary power generators for all mechanical equipment that uses a hydraulic system, such as construction machinery, machine tools, agricultural machinery, automobiles, aviation, defense industry. However, currently commercialized hydraulic power generator is only a level of assembling the hydraulic system, it has only a simple function to control the direction of the set pressure and flow path for generating power and the safety of the system, the configuration of the pump, motor Each component such as hydraulic tank is combined with simple energy loss and noise due to power transmission mechanism, and wastes a lot of space.

Recently, an electric motor-integrated hydraulic pump has been developed to improve the problems of the conventional hydraulic power generator. The motor-integrated hydraulic pump is divided into four parts. Housing body for storing hydraulic fluid and mounting all components, electric motor and hydraulic pump for generating hydraulic power inside the housing body, cooling device for preventing the temperature rise of hydraulic fluid, speed or pressure of the hydraulic pump It consists of a control module that controls the appropriately.

Since the motor-integrated hydraulic pump is integrated inside the oil tank by integrating the motor and the hydraulic pump, the structure is low in noise and compact, and the speed or pressure of the hydraulic pump can be appropriately controlled according to the use conditions, thereby saving energy. There is an advantage to reduce. In addition, it is possible to omit the hydraulic valves that previously performed a simple function can reduce the cost, the failure rate can be improved to improve the reliability of the entire hydraulic power generator.

On the other hand, the motor-integrated hydraulic pump may cause problems such as viscosity change of hydraulic oil and temperature rise of the workpiece due to the increase in temperature due to the high speed and high pressure. have. In particular, in the case of the electric motor with the highest heat generation in the motor-integrated hydraulic pump, as shown in Figure 1, the cooling system for cooling by heat exchange with the motor by circulating the hydraulic fluid drained (drain) to the oil tank and the cooling device of the housing body I'm using 1 is a streamlined view inside a housing body which analyzes and shows a flow of a conventional motor-integrated hydraulic pump.

However, in the conventional motor-integrated hydraulic pump, since the hydraulic oil moves only through a predetermined path formed in the oil tank, as shown in FIG. 1, the area in which the hydraulic oil does not actively circulate to the entire oil tank area is limited. There is a problem. That is, the heat generated from the motor is not well transmitted to the entire area inside the housing body has a problem that the heat radiation efficiency of the motor is low.

The present invention has been made to solve the above problems, by improving the hydraulic oil flow path inside the housing body to improve the cooling efficiency, it is possible to continuously operate for a long time by the electric motor-integrated hydraulic pump that can maximize the operating effect The purpose is to provide.

The problem to be solved by the present invention is not limited to the above-mentioned problem, another problem to be solved by the present invention not mentioned here is apparent to those skilled in the art from the following description. Can be understood.

The motor-integrated hydraulic pump according to the present invention includes: an electric motor and a hydraulic pump formed on the same axis to form hydraulic pressure of hydraulic oil; A housing body defining a receiving space of the electric motor and the hydraulic pump, and a storage space of the hydraulic oil, and a circulation hole of the hydraulic oil in each of the inner partitions that partition or support the space; And an oil cooler formed at the rear end of the housing body to cool the hydraulic oil, and by hydraulic pressure of the hydraulic oil being drained and rotational operation of the motor, the hydraulic oil flows through the circulation hole and the entire area inside the housing body. It is characterized by circulating.

In addition, the housing body of the present invention is formed in a cylindrical shape for receiving the electric motor and the hydraulic pump at the center of the housing body and the outer wall portion of the rectangular cylinder shape with the front and rear open, the first circulation hole along the circumferential surface It is formed in the receiving portion, and the upper and lower left and right surfaces of the outer wall portion is formed in a support plate shape extending to the circumferential surface of the receiving portion to support the receiving portion, the second circulation hole is formed along each support plate surface, the outer wall portion and the accommodation It characterized in that it comprises an oil tank unit for forming a storage space of the hydraulic oil between the sections.

In addition, the first circulation hole of the present invention is characterized in that perforated in each of the quadrant partitioned by the support at a predetermined interval along the circumferential surface, in front and rear of the receiving portion.

In addition, the second circulation hole of the present invention is characterized in that the perforated in front and rear of each support plate surface.

In addition, the motor-integrated hydraulic pump of the present invention includes a first flow path in which hydraulic oil is supplied to an external hydraulic actuator by hydraulic operations of the motor and the hydraulic pump, and a second in which hydraulic oil is drained from the hydraulic actuator into the housing body. A flow passage, a third flow passage through which the hydraulic oil circulates through the entire area inside the housing body, a fourth flow passage supplied with the hydraulic coolant branched from the second flow passage to the oil cooler, and then supplied into the housing body, And a fifth flow path supplied from the inside of the housing body to the hydraulic pump.

In addition, the electric motor-integrated hydraulic pump of the present invention is further formed with a branch hole extending from the front end to the rear end of the housing body and isolated from the hydraulic oil storage space, the fourth flow path is formed by the branch hole.

By the means for solving the above problems, the motor-integrated hydraulic pump of the present invention is improved cooling efficiency, it is possible to continuous operation for a long time has the effect of maximizing the operation effect.

In addition, the hydraulic motor of the motor-integrated hydraulic pump of the present invention can absorb the noise, vibration and heat generated by the operation, and furthermore, since the structure can be made compact, the installation space efficiency can be achieved.

1 is a streamlined view inside a housing body which analyzes and shows a flow of a conventional motor-integrated hydraulic pump.
2 is a view for explaining an electric motor-integrated hydraulic pump according to an embodiment of the present invention.
3 is a perspective view of a housing body according to an embodiment of the present invention.
4 is a plan view of a housing body according to an embodiment of the present invention.
5 is a cross-sectional view taken along line AA ′ and BB ′ of FIG. 4.
6 is a front view of a housing body according to an embodiment of the present invention.
7 is a cross-sectional view taken along line CC ′ and DD ′ of FIG. 6.
8 is a view for explaining the flow path of the motor-integrated hydraulic pump according to an embodiment of the present invention.
9 is a view showing the streamline inside the housing body according to an embodiment of the present invention.
10 is a view showing a velocity field inside the housing body according to an embodiment of the present invention.
11 is a view showing the temperature field inside the housing body according to an embodiment of the present invention.

Specific matters including the problem to be solved, the solution to the problem, and the effects of the present invention as described above are included in the following embodiments and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

2 is a view for explaining an electric motor-integrated hydraulic pump according to an embodiment of the present invention.

As shown in FIG. 2, the motor-integrated hydraulic pump 100 according to an embodiment of the present invention includes an electric motor 110, a hydraulic pump 120, a housing body 130, and an oil cooler 140. .

The electric motor 110 is composed of a stator 111 and a rotor 112, and a main shaft 113 integral with the hydraulic pump 120 is formed at the center of the rotor 112. The electric motor 110 according to the embodiment of the present invention preferably uses a permanent magnet electric motor.

The hydraulic pump 120 is integrally formed on the same axis as the electric motor 110 through the main shaft 113, and consists of a variable displacement piston pump including a piston, a cylinder block, a valve plate, and a swash plate for adjusting the flow rate. Such a hydraulic pump 120 is a key component of the motor-integrated hydraulic pump functions to convert the electrical energy into mechanical energy to generate hydraulic pressure in the hydraulic oil.

The housing body 130 includes a receiving space 132 (corresponding to the receiving portion 132 shown in FIGS. 3 to 7) of the electric motor and the hydraulic pump, and a storage space 134 of the hydraulic fluid (134, shown in FIGS. 3 to 7). Oil tank part 134), and each of the inner partitions (corresponding to the partitions of the receiving part 132 and the support part 133 shown in Figs. The circulation hole (refer to 132a, 132b, 133a in Figs. 3 to 7) is formed. In addition, the housing body 130 is a hydraulic operation of the hydraulic oil to be drained by the rotation operation of the electric motor 110, the hydraulic oil flows through the circulation hole and circulates the entire area inside the housing body 130. The housing body 130 is formed of an aluminum material having high thermal conductivity. Thereby, the heat radiating effect of the electric motor 110 can be improved. A more detailed description thereof will be described later with reference to FIGS. 3 to 11.

In addition, the housing body 130 is attached to the level gauge (Level Gage) to check the amount of the hydraulic fluid on the surface, and the occurrence of negative pressure generated inside the housing body 130 by the injection of the hydraulic fluid and the hydraulic pump on the upper surface A cap & air breather is attached to prevent it. In addition, the housing body 130 itself has a form in which the front and rear surfaces are open, and a front cover and a rear cover for sealing the housing body 130 are internally attached to a gasket for preventing leakage of hydraulic oil. .

The oil cooler 140 is formed at the rear end of the housing body 130 to cool the hydraulic oil. That is, by cooling the hydraulic oil that has become a high temperature by heat exchange with the motor 110 in the housing body 130, by maintaining a constant temperature of the hydraulic oil to increase the pumping efficiency (pumping) efficiency of the motor-integrated hydraulic pump and operating reliability Increase the continuous operation performance. To this end, the motor-integrated hydraulic pump according to an embodiment of the present invention bypasses the hydraulic fluid being drained to the oil cooler 140 and returns to the housing body 130 by a separate flow path 135 of the present invention. As the fourth flow path, the branch holes 135 in FIGS. 3 to 7) are formed. The oil cooler 140 is composed of components such as a compressor, a condenser, an evaporator, and an electronic expansion valve. Specifically, the compressor is a component that plays a pivotal role in the refrigerant circulation of the oil cooler 140, and compresses the refrigerant in a gas state to a high temperature and high pressure state. The condenser and the cooling fan convert the refrigerant gas of high temperature and pressure into a liquid phase by pressure and temperature control. Cooling fans are attached to speed up the heat exchange of the condenser. The evaporator crosses the refrigerant and the hydraulic oil to direct the heat exchanger to discharge the hydraulic oil to a temperature suitable for the set temperature. The electronic expansion valve controls the temperature of the hydraulic oil by electronically controlling the valve opening degree according to the superheat degree of the refrigerant.

As described above, the motor-integrated hydraulic pump according to an embodiment of the present invention increases heat dissipation efficiency by main heating components being immersed in the hydraulic oil and circulating the whole area inside the housing body through the circulation hole. In addition, it is possible to increase the continuous operation performance and reliability because the separate oil cooler is attached. In addition, since the components are embedded in the housing body, the space saving effect is high.

On the other hand, a space in which an integrated controller (not shown) can be accommodated is disposed on the side of the housing body 130. The integrated controller is composed of a power drive module and a control module, and after detecting the operating pressure and flow rate of the hydraulic pump 120 in order to operate the hydraulic oil at a predetermined pressure and flow rate, the integrated controller feeds back a signal to the integrated controller By controlling the rotational speed of the motor 110 by a controller to control the desired pressure and flow rate.

3 to 7 are views for explaining a housing body according to an embodiment of the present invention. Specifically, FIG. 3 is a perspective view of a housing body according to an embodiment of the present invention, FIG. 4 is a plan view of the housing body according to an embodiment of the present invention, and FIG. 5 is an AA ′ cut line and a BB ′ cut line of FIG. 4. 6 is a front view of the housing body according to the exemplary embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along line CC ′ and DD ′ of FIG. 6.

3 to 7, the housing body 130 according to an embodiment of the present invention, the outer wall portion 131, the receiving portion 132, the support portion 133 and the oil tank portion 134 Include.

The outer wall portion 131 forms a square cylindrical shape in which the front and rear surfaces are open, and forms a foundation of the housing body 130 for accommodating or mounting other components.

Receiving portion 132 is formed in a cylindrical shape for receiving the electric motor 110 and the hydraulic pump 120 at the center of the outer wall portion 131, the housing body 130, the first circulation hole 132a along the circumferential surface , 132b) is formed.

The support part 133 extends from each of the upper, lower, left, and right surfaces of the outer wall part 131 to the circumferential surface of the receiving part 132 and is formed in the shape of a supporting plate for supporting the receiving part 132, and the second circulation hole along each supporting plate surface. 133a is formed.

The oil tank part 134 forms a storage space of hydraulic oil between the outer wall part 131 and the receiving part 132.

Here, the accommodating part 132 and the support part 133 are formed in a cylindrical shape and a support plate shape, and form a partition wall that isolates each space inside the housing body 133. In one embodiment of the present invention, the receiving portion 132 constituting the inner partition wall in order to prevent the hydraulic fluid drained by each of the isolated spaces to form a single flow path, thereby reducing the heat dissipation efficiency by heat exchange only in a limited area. ) And the support hole 133 to form a circulation hole, that is, the first circulation hole (132a, 132b) and the second circulation hole (133a). The hydraulic fluid may flow between the receiving portion 132 and the oil tank 134 through the first circulation holes 132a and 132b, and through the second circulation hole 133a, as shown in FIG. It is possible to flow between the oil tank unit 134 divided into quadrants by). In this case, in addition to the hydraulic pressure of the hydraulic oil being drained, the rotational force according to the rotational operation of the electric motor 110 is provided to the hydraulic oil flowing into the receiving portion 132 through the first circulation holes 132a and 132b. In addition, the flow of the hydraulic oil becomes more active within the housing body 130, and thus the hydraulic oil can circulate the entire area inside the housing body 130. Therefore, the heat exchange efficiency of the electric motor 110 and hydraulic oil is raised. In addition, since the hydraulic oil directly contacts the electric motor 110, the heat exchange efficiency is further improved.

On the other hand, in one embodiment of the present invention, in order to optimize the circulation flow path of the hydraulic oil in the housing body 130, the first circulation holes (132a, 132b) through the flow analysis as shown in Figs. And optimally design the number and positions of the second circulation holes 133a and arrange them as shown in FIGS. 5 and 7. That is, it is preferable that the first circulation holes 132a and 132b are perforated in each of the quadrants partitioned by the support part 133 at regular intervals along the circumferential surface in front and rear of the accommodation part 132. Here, the rear first circulation hole 132a is formed in a long hole shape in order to minimize interference during fixed coupling by press-fitting of the electric motor 110. In addition, the second circulation hole 113a is preferably perforated in front and rear of each support plate surface of the up, down, left and right.

In addition, the housing body 130 according to an embodiment of the present invention, the branch hole 135 extending from the front end to the rear end of the housing body 130 and isolated from the hydraulic oil storage space is further formed, the following Figure 8 A fourth flow path shown in FIG. Specifically, the fourth flow path is a separate flow path that bypasses the hydraulic oil being drained to the oil cooler 140 and returns to the housing body 130, and is formed in the front cover formed on the front surface of the housing body 130. Branched from two flow paths, connected to a branch hole 135 of the housing body 130, and connected to the oil cooler 140 through a rear cover formed at the rear of the housing body 130 from the branch hole 135, After forming the circulation path in the oil cooler 140 is connected to the housing body 140 through the rear cover. As such, the hydraulic hydraulic oil cooled by the oil cooler 140 may be separately formed without heat exchange with the electric motor 110, thereby further improving cooling efficiency. The cooled low temperature hydraulic oil is returned to the housing body 130 and mixed with the heat exchanged high temperature hydraulic oil to lower the temperature of the hydraulic oil. Meanwhile, although the branch holes 135 are located in the upper left corner of the housing body 130 in FIGS. 3 to 7, as shown in FIG. 2, if necessary, the branch holes 135 are also located below the housing body 130. It is possible.

8 is a view for explaining the flow path of the motor-integrated hydraulic pump according to an embodiment of the present invention.

As shown in Figure 8, the entire flow path according to an embodiment of the present invention, the hydraulic oil is supplied to the external hydraulic actuator 10 by the hydraulic operation of the electric motor 110 and the hydraulic pump 120. A first flow passage, a second flow passage in which the hydraulic hydraulic oil is drained from the hydraulic actuator 10 into the housing body 130, a third flow passage in which the hydraulic hydraulic oil circulates through the entire area inside the housing body 130, and hydraulic hydraulic oil. Is branched from the second flow path is supplied to the oil cooler 140, the fourth flow path is supplied to the interior of the housing body 130, the hydraulic fluid is supplied to the hydraulic pump 120 from the inside of the housing body 130 5 euros.

As described above, the motor-integrated hydraulic pump according to the embodiment of the present invention forms a third flow path through which the hydraulic hydraulic oil circulates the entire area inside the housing body through the circulation hole, and separate fourth flow path circulating the oil cooler. Forming can sufficiently secure the heat dissipation and cooling efficiency.

9 to 11 is a view showing the analysis of the flow of the motor-integrated hydraulic pump according to an embodiment of the present invention. Specifically, FIG. 9 is a view showing a streamline inside a housing body according to an embodiment of the present invention, FIG. 10 is a view showing a velocity field inside the housing body according to an embodiment of the present invention, and FIG. Figure is a view showing the temperature field inside the housing body according to an embodiment of the present invention.

Looking at the streamline of Figure 9, compared to the streamline of Figure 1, the streamline according to an embodiment of the present invention shows a form in which the hydraulic oil is circulated to the entire area inside the housing body.

In addition, it can be seen that the hydraulic oil is actively circulated to the entire region inside the housing body in the cross-sectional velocity field (cross section 1 to cross section 4) from the front end to the rear end of FIG. 10.

In addition, although the temperature inside the housing body initially set in FIG. 11 is 50 ° C., the temperature of the hydraulic fluid flowing into the interior is 90 ° C., therefore, the internal temperature of the housing body is expected to increase, but cooling through the oil cooler mounted rearward. It can be seen that the temperature of the hydraulic oil does not increase much due to the heat transfer between the hydraulic oil and the hydraulic oil circulating therein.

As described above, in one embodiment of the present invention, heat generated from an electric motor can be effectively released as compared with the related art.

<Other Embodiments>

5 and 7 are examples of the arrangement of the circulation holes for forming the optimized circulation passage, and may be changed and arranged as necessary.

As described above, it is to be understood that the technical structure of the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from an equivalent concept should be construed as being included in the scope of the present invention.

10: hydraulic actuator
100: motor integrated hydraulic pump
110: electric motor
111: stator
112: rotor
113: main axis
120: hydraulic pump
130: housing body
131: outer wall
132: receptacle
132a, 132b: circulation hole (first circulation hole)
133: support
133a: circulation hole (second circulation hole)
134: oil tank unit
135: branch hole
140: oil cooler

Claims (6)

An electric motor and a hydraulic pump formed on the same axis to form hydraulic pressure of the hydraulic oil;
A housing body forming a receiving space of the electric motor and the hydraulic pump and a storage space of the hydraulic oil, and a circulation hole of the hydraulic oil being formed in each of the inner partition walls that partition or support the space; And
An oil cooler formed at a rear end of the housing body to cool the hydraulic oil;
The hydraulic hydraulic fluid is an electric motor-integrated hydraulic pump, characterized in that the hydraulic fluid flows through the circulation hole and circulates the entire area inside the housing body by the hydraulic operation of the hydraulic oil being drained and the rotation operation of the electric motor. The method of claim 1,
The housing body,
Outer wall portion forming a square cylinder shape of the front and rear open,
A receiving portion formed in a cylindrical shape for receiving the electric motor and the hydraulic pump at the center of the housing body, the first circulation hole being formed along a circumferential surface thereof;
A support portion extending from the top, bottom, left and right surfaces of the outer wall portion to a circumferential surface of the accommodation portion to support the accommodation portion, and having a second circulation hole formed along each support plate surface;
And an oil tank unit forming a storage space of the hydraulic oil between the outer wall and the housing. The method of claim 2,
The first circulation hole is perforated in each of the quadrant partitioned by the support at a predetermined interval along the circumferential surface, in front and rear of the receiving portion. The method of claim 2,
The second circulation hole is a motor-integrated hydraulic pump, characterized in that perforated in front and rear of each support plate surface. The method according to claim 1 or 2,
A first flow path through which the hydraulic oil is supplied to an external hydraulic actuator by a hydraulic operation of the electric motor and the hydraulic pump, a second flow path through which the hydraulic oil is drained from the hydraulic actuator into the housing body, and the hydraulic oil A third flow path for circulating the entire area inside the housing body, a fourth flow path supplied into the housing body after the hydraulic oil is branched from the second flow path and supplied to the oil cooler, and the hydraulic oil And a fifth flow path supplied from the inside of the housing body to the hydraulic pump. The method of claim 5,
And a branch hole extending from the front end to the rear end of the housing body and separated from the hydraulic oil storage space, wherein the fourth flow path is formed by the branch hole.

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