KR20090055075A - Apparatus for generating hydraulic power - Google Patents

Abstract

A hydraulic power generator is provided to optimize the length and cross-sectional area to a receiving space of an inside-vehicle hydraulic power generator. A hydraulic power generator comprises a housing(10) and a rotation shaft(40). The housing comprises a pump housing(20) and a motor housing(11). The pump housing has a second hollow part(21) in which a pump unit(50) is arranged. The motor housing has a first hollow part(15) in which a stator(31) and a rotor(32) are arranged in inside. The motor housing comprises a joint(16) and an enlargement part(12). The joint is combined in one side of the pump housing. The enlargement part is extended from the joint and the first hollow part is formed in the inner side. The cross-sectional area of the enlargement part of formed the get larger the farther to the first hollow part. The rotation shaft is pivotally supported in the housing and the torque of the rotor is delivered to the pump unit by being rotated with the rotor.

Description

Hydraulic Power Generator {APPARATUS FOR GENERATING HYDRAULIC POWER}

The present invention relates to a hydraulic power generator, and more particularly to a hydraulic power generator that can be optimally disposed in the storage space by adjusting the capacity by adjusting the size of the diameter, that is, the cross-sectional area as well as the length.

In general, a hydraulic power generator is a device for converting electrical energy into hydraulic power for driving a work device such as a construction machine such as an excavator, and includes a hydraulic pump and an electric motor for driving the hydraulic pump.

In recent years, studies are being actively conducted to use the above-mentioned hydraulic power generator as a main power source for a small electric excavator. These hydraulic power generators must be able to generate the power required for work and travel, as well as be efficiently deployed in the limited engine room of small vehicles.

1 is a cross-sectional view schematically showing an example of a conventional hydraulic power generator. Referring to FIG. 1, a conventional hydraulic power generating device rotates by electromagnetic interaction with a housing 1, a stator 2 fixedly installed inside the housing 1, and the stator 2. A single shaft 4 rotatably supported by the electron 3, the housing 1, the rotor 3 being fixedly installed and rotating together with the rotor 3, and the rotor 3. A plurality of cylinders (5) formed in the circumferential direction, a piston (6) installed reciprocally in each of the cylinders (5), a piston shoe (7) rotatably connected to the piston (6), The piston shoe 7 includes an inclined plate 8 in slidable contact.

In such a hydraulic power generator, when the rotor 3 rotates, the piston 6 and the piston shoe 7 rotate in the circumferential direction. At this time, the piston shoe 7 reciprocates the piston 6 while sliding along the inclined plate 8. The hydraulic fluid is sucked into and discharged from the cylinder 5 by the reciprocating motion of the piston 6.

However, in the hydraulic power generator as described above, since the cylinder 5 is installed in the rotor 3 in the circumferential direction, the length of the rotor 3 and the stator 2 must be increased in order to increase its capacity. The length of the hydraulic power generator is determined by the required capacity. Accordingly, there is a problem in that the arrangement can not be optimally arranged in the limited storage space of the vehicle and the degree of freedom in design is reduced. In severe cases, the storage space, that is, the vehicle body may be generated until it is necessary to design the hydraulic power generator.

In particular, the hydraulic power generating device may be installed in an industrial vehicle having an engine to be selectively driven by using electric energy or engine power supplied from the inside or outside of the vehicle, in this case, because of the installation space of the engine The problem that the design freedom as described above is further reduced occurs.

The present invention has been made in view of the above-described point, and an object of the present invention is to provide a hydraulic power generating apparatus capable of adjusting the capacity by adjusting the size of the cross-sectional area as well as the length to improve the degree of freedom of design.

Hydraulic power generating apparatus according to the present invention for achieving the object as described above, the first hollow portion is disposed in the stator and the rotor rotating by the electromagnetic interaction with the stator, and the hydraulic oil in conjunction with the rotation of the rotor A housing having a second hollow portion in which a pump unit for discharging the gas is disposed; And a rotation shaft rotatably supported in the housing, the rotor being fixedly installed to rotate together with the rotor, and transmitting a rotational force of the rotor to the pump unit, wherein the housing includes: the second shaft; A pump housing in which the hollow part is formed; And a motor housing having one side coupled to the pump housing and the other having the first hollow portion formed therein, wherein the motor housing comprises: a coupling portion coupled to one side of the pump housing; And an enlarged portion formed at one side of the second hollow portion at an inner side, the other side extending from the coupling portion, and having a cross sectional area extending as the second hollow portion is formed to extend to the one side on which the second hollow portion is formed.

According to an embodiment of the present invention, an opening portion for opening the second hollow portion is formed at one end of the enlarged portion, and a cover is coupled to the opening portion to block the second hollow portion from the outside of the housing.

In addition, the outer periphery of the cover is formed in the flange portion coupled to the vehicle body extending in the radial direction.

In addition, the rotating shaft has an extension extending through the motor housing, a cooling fan is coupled to the extension portion, and between the inner surface of the enlarged portion and the rotating shaft from the first hollow portion to the second hollow There is interposed a sealing member for partitioning the airtightness of the part.

According to the problem solving means described above, the electric motor which is the capacity of the hydraulic power generator by setting the cross sectional area of the enlarged part of the motor housing in which the rotor and the stator are accommodated is larger than the cross sectional area of the pump housing in which the pump unit is installed. The capacity of can be adjusted by increasing or decreasing the cross sectional area of the motor housing, whereby the length and the cross sectional area of the hydraulic power generating device can be designed to be optimized according to the storage space of the hydraulic power generating device of the vehicle. That is, in the past, only the length adjustment was possible to increase the capacity of the hydraulic power generator. According to the present invention, the capacity of the hydraulic power generator may be designed by modifying the size of the cross-sectional area as well as the length of the hydraulic power generator. It is possible to design a hydraulic power generator optimized for the storage space.

In addition, by forming a flange portion on the cover of the motor housing, and by installing the hydraulic power generator in the vehicle body through the flange portion, it is possible to install the hydraulic power generator in a vertical direction, thereby storing the hydraulic power generator It can be optimally placed in the space.

On the other hand, since the cooling fan is installed in the extension of the rotary shaft extending through the other side of the motor housing in the state where the hydraulic power generator is vertically arranged, air flowing by the cooling fan can be discharged to the upper portion of the vehicle As a result, it is possible to prevent the cooling wind from blowing toward the person.

In addition, the motor housing and the pump housing are detachably coupled to each other, and a sealing member for partitioning the first hollow portion and the second hollow portion to maintain airtightness is interposed between the motor housing and the rotary shaft, thereby providing a motor unit such as a rotor or a stator. Not only can the pump unit be contaminated by dirt during this failure, but also the electric motor such as the rotor or stator can be prevented from being contaminated by dirt when the pump unit is broken, thereby improving the reliability of the hydraulic power generator. .

Hereinafter, a hydraulic power generator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 2, the hydraulic power generating apparatus according to an embodiment of the present invention includes a housing 10, a motor unit 30, a rotating shaft 40, a pump unit 50, and a sealing member 60. And a cooling fan 70.

The housing 10 includes a motor housing 11 in which the motor unit 30 is accommodated, and a pump housing 20 in which the pump unit 50 is received and detachably coupled to one end of the motor housing 11. It includes.

The motor housing 11 has a coupling part 16 having one end detachably coupled to the pump housing 20 by a fastening means such as a bolt, and an enlarged part extending from the other end of the coupling part 16. 12 and a cover 17 coupled to the enlarged portion 12 to cover the opening 13 of the enlarged portion 12.

The coupling part 16 is manufactured to have the same outer diameter as the motor housing 11 so as to be easily coupled to the motor housing 11.

The enlarged portion 12 is formed by expanding the cross-sectional area from one side of the coupling portion 16, the first hollow portion 15 is formed therein. The motor unit 30 including the rotor 32, the stator 31, and the coil 33 is accommodated in the first hollow part 15. As such, an enlarged part 12 extended from the pump housing 20 or the coupling part 16 is formed, and the rotor 32, the stator 31, and the coil 33 are accommodated inside the enlarged part 12. Thus, the size of the rotor 32 and the stator 31 and the number of turns of the coil 33 can be increased, thereby increasing the capacity of the hydraulic power generator without increasing the length of the hydraulic power generator. do. Of course, by increasing the length of the motor unit 30 may increase the capacity of the hydraulic power generating device. That is, according to the present embodiment, the capacity of the hydraulic power generator can be adjusted while adjusting the diameter as well as the length of the motor unit 30 to suit the limited storage space 74 in which the hydraulic power generator is accommodated. Freedom is improved.

On the other hand, a cooling channel 14a recessed in a radial direction is formed on the outer circumferential surface of the enlarged portion 12 to efficiently cool the enlarged portion 12 heated by the motor unit 30. The cooling passage 14a is formed in the circumferential direction of the enlarged part 12, and a heat dissipation cover 14b is provided on the cooling passage 14a. Although not shown in the present embodiment, a cooling fin may be provided on the outer circumferential surface of the heat dissipation cover 14b or the enlarged portion 12.

The cover 17 is coupled to the enlarged portion 12 by fastening means (not shown), such as a bolt, to cover the opening 13 of the enlarged portion 12.

The hydraulic power generator according to the present embodiment as described above can be installed so that the end of the rotary shaft 40 is connected to the output shaft (not shown) of the engine when the engine is installed in an industrial vehicle. In this case, each of the end of the pump housing 20 and the end of the motor housing 11 is seated on a bracket (not shown) separately provided on the vehicle body of the industrial vehicle and installed horizontally on the vehicle body. 40 is installed to be connected to the output shaft (not shown) of the engine. This is in consideration of the installation of a combined electric / engine industrial vehicle, which has recently been developed for fuel economy, and when configured as described above, when using electric energy, the motor unit 30 installed inside the hydraulic power generator is used. In this case, the pump unit 40 is driven, and when the engine is used, the output shaft of the engine and the rotating shaft 40 are rotated together when the engine is driven, thereby driving the pump unit 50. In addition, when the pump unit 50 is driven using an engine, the motor unit 30 may be used as a generator.

On the other hand, when the hydraulic power generator is mounted on the electric industrial vehicle, the flange portion 18 is formed to extend in the radial direction on the outer circumference of the cover 17, a plurality of fastening holes 19 is the flange portion ( 18) can be formed to be arranged in the circumferential direction. In this case, as illustrated in FIG. 3, the hydraulic power generator may be installed to be perpendicular to the storage space 74 of the vehicle body by using the fastening means B such as a bolt. This arrangement makes it possible to design the layout of the storage space 74 more efficiently. Of course, similar to the case of the electric vehicle / engine combined industrial vehicle described above, a bracket is installed in the pump housing 20 and fixed to the vehicle body through the bracket so that the hydraulic power generator is laid in the storage space 74. It may be installed to be arranged in the horizontal direction.

The motor unit 30 includes a stator 31 fixedly installed inside the enlarged part 12, a coil 33 installed at the enlarged part 12 so as to be wound around the stator 31. And a rotor 32 fixedly installed to the rotation shaft 40 while maintaining a gap with the stator 31. The rotor 32 may be manufactured by installing a permanent magnet on a plurality of laminated silicon steel sheets.

Looking at the driving principle of the motor unit 30 having the above-described configuration, when power is applied to the coil 33, the magnetic field formed in the stator 31 and the electrons of the permanent magnet installed in the rotor 32 The rotational force is generated in the rotor 32 by a miracle action, and this rotational force is transmitted to the rotating shaft 40. Since the general principle of driving the motor unit 30 is already known, a detailed description thereof will be omitted. In addition, the above-mentioned motor unit 30 is not limited to the above-described configuration, and various electric motors already known may be employed.

The rotating shaft 40 is rotatably supported in the housing 10 via the bearings 41 and 42. More specifically, a first bearing 41 is interposed between the cover 17 and the rotary shaft 40, and a second bearing 42 between the motor housing 11 and the rotary shaft 40. ) And the rotation shaft 40 is rotatably supported by the housing 10.

The pump unit 50 is inserted into the motor housing 11 and is installed on the inclined plate 51 fixed to the motor housing 11 and fixed to the rotary shaft 40 and in the circumferential direction. A cylinder barrel 54 having a plurality of cylinders 55 formed thereon, a piston 52 reciprocally installed in the plurality of cylinders 55, and one end of the piston 52 rotatably connected to each other. And a piston shoe 53 slidably contacting the inclined plate 51. Looking at the operation of the pump unit 50 having the configuration as described above, first, the cylinder barrel 54, the piston 52 and the piston shoe 53 by the rotation of the rotary shaft 40, the rotary shaft 40 Rotate movement around Then, the piston shoe 53 moves along the contact surface of the inclined plate 51 to linearly reciprocate the piston 52 at a stroke corresponding to the inclination angle of the inclined plate 51. By the linear reciprocating movement of the piston 52, the cylinder 55 sucks the hydraulic oil into the inlet port (not shown) and discharges the hydraulic oil to the outlet port (not shown). The hydraulic fluid is thereby delivered to the working device at a constant pressure.

The sealing member 60 is interposed between the housing 10 and the rotation shaft 40 and partitions the first hollow portion 15 and the second hollow portion 21 to maintain airtightness. The sealing member 60 is installed to be fixed to the housing 10, and is installed to be slidable to the rotary shaft 40. Therefore, the rotary shaft 40 can be rotated by the sealing member 60 while maintaining the airtightness between the first hollow portion 15 and the second hollow portion 21.

When a failure occurs in the motor unit 30, the cover 17 is removed from the enlarged part 12 to repair the motor unit 30. At this time, the pump unit 50 is partitioned so as to maintain airtightness by the first hollow portion 15 and the sealing member 60 in which the motor unit 30 is accommodated, and occurs during the repair process of the motor unit 30. It is possible to prevent the dirt from being introduced into the motor unit 30. On the contrary, when the pump unit 50 has a failure, the pump housing 20 is separated from the motor housing 11 to repair the pump unit 50. At this time, the pump is prevented by the sealing member 60. It is possible to prevent dirt from flowing into the motor unit 30 during repair of the unit 50.

The cooling fan 70 is fixed to the extension part 43 of the rotary shaft 40 extending through the other side of the motor housing 11 and rotates together with the rotary shaft 40. As such, as the cooling fan 70 is installed in the extension part 43 extending to the other side of the motor housing 11, as shown in FIG. 3, air flowing by the cooling fan 70 is vehicle. It can be discharged above to prevent direct contact with nearby workers.

Referring to FIG. 3, an oil cooler 71 or the like is installed above the cooling fan 70, and the air flowed by the cooling fan 70 to take heat from the oil cooler 71 is an engine room door. It is arrange | positioned out through the grill part 73 formed above 72. As such, by discharging the air by the cooling fan 70 to the upper side of the vehicle, it is not possible to directly reach the worker around the vehicle, so that discomfort caused by hot air directly reaching the worker can be prevented.

4 is a schematic cross-sectional view of a hydraulic power generating apparatus according to another embodiment of the present invention. Referring to FIG. 4, unlike one embodiment of the present invention, a cooling fan 170 is installed in an extension 143 extending forward from the rotation shaft 140. As described above, the cooling fan 170 may be installed at the front end as well as the rear end, so that the layout of the storage space may be variously changed, thereby designing the layout of the storage space more efficiently.

1 is a cross-sectional view schematically showing a conventional hydraulic power generator,

2 is a cross-sectional view schematically showing a hydraulic power generating apparatus according to an embodiment of the present invention,

3 is a view schematically showing an example in which the hydraulic power generating device shown in FIG. 2 is disposed in an accommodation space;

4 is a schematic cross-sectional view of a hydraulic power generating apparatus according to another embodiment of the present invention.

<Description of main reference numerals in the drawings>

10; A housing 11; Motor housing

12; Enlarged portion 15; Division 1

17; Cover 18; Flange

30; Motor unit 31; Stator

32; Rotor 40; Rotating shaft

43; Extension 40; Pump unit

60; Sealing member 70; Cooling fan

Claims (5)

The stator 31 and the first hollow portion 15 in which the rotor 32 rotates by electromagnetic interaction with the stator 31 are disposed, and the hydraulic oil is discharged in association with the rotation of the rotor 32. A housing 10 having a second hollow portion 21 in which a pump unit 30 is disposed; And Is rotatably supported in the housing 10, the rotor 32 is fixedly installed to rotate with the rotor 32, the rotational force of the rotor 32 to the pump unit 30 Rotating shaft 40 for transmitting, The housing 10 is, A pump housing 20 in which the second hollow portion 21 is formed; And One side is coupled to the pump housing 20, the other side is provided with a motor housing 11, the first hollow portion 15 is formed, The motor housing 11, A coupling part 16 coupled to one side of the pump housing 20; And One side of the second hollow portion 21 is formed on the inside, the other side extends from the coupling portion 16, the cross-sectional area is formed in a shape that extends as it proceeds to one side where the second hollow portion 21 is formed. Hydraulic power generating device characterized in that it comprises an enlarged portion 12. The method of claim 1, An open part 13 is formed at one end of the enlarged part 12 to open the second hollow part 21. A cover 17 is coupled to the opening portion 13 to shut off the second hollow portion 21 from the outside of the housing 10. The method of claim 2, Hydraulic power generating device, characterized in that the flange portion (18) coupled to the vehicle body is formed extending in the radial direction on the outer circumference of the cover (17). The method according to any one of claims 1 to 3, The rotating shaft 40 has an extension portion 43 extending through the motor housing 11, the cooling fan 70 is coupled to the extension portion 43, characterized in that the hydraulic power generating device . The method according to any one of claims 1 to 3, A sealing member 60 is interposed between the inner surface of the enlarged portion 12 and the rotary shaft 40 so as to maintain the airtightness of the second hollow portion 21 from the first hollow portion 15. Hydraulic power generating device characterized in that.

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