KR100733275B1 - A reduction geared motor - Google Patents

A reduction geared motor Download PDF

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Publication number
KR100733275B1
KR100733275B1 KR1020070023622A KR20070023622A KR100733275B1 KR 100733275 B1 KR100733275 B1 KR 100733275B1 KR 1020070023622 A KR1020070023622 A KR 1020070023622A KR 20070023622 A KR20070023622 A KR 20070023622A KR 100733275 B1 KR100733275 B1 KR 100733275B1
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South Korea
Prior art keywords
reduction gear
motor
gear
pinion
shaft
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KR1020070023622A
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Korean (ko)
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박광호
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(주)보림
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/02—Details
    • H02P3/04—Means for stopping or slowing by a separate brake, e.g. friction brake, eddy-current brake

Abstract

A motor with a reduction gear is provided to reduce noise and vibration when being used for operating a chair of a medical instrument. In a motor(10) with a reduction gear, a first pinion(41A), a first reduction gear(41B), a second pinion(42A), and a second reduction gear(42B) are installed in a case of the motor(10) as helical gears of which ends of teeth are inclined to axes. A third pinion(43A), a third reduction gear(43B), a fourth pinion(44A), and a fourth reduction gear(44B) are installed as spur gears of which the ends of the teeth are parallel to the axes. Both ends of a reduction gear axis(12) are inserted into an outer plate of the case and an axis insertion groove(31) of a middle separation plate by the medium of a bearing(23). The first pinion(41A) is formed as the helical gear at an end of a driving axis(11) by being integrated with the driving axis(11) of the motor(10).

Description

감속기어가 내장된 모터 {A reduction geared motor}Motor with reduction gear {A reduction geared motor}

도 1은 본 발명에 따른 감속기어가 내장된 모터를 예시한 사시도1 is a perspective view illustrating a motor incorporating a reduction gear according to the present invention;

도 2는 본 발명에 따른 감속기어가 내장된 모터를 예시한 단면도2 is a cross-sectional view illustrating a motor incorporating a reduction gear according to the present invention.

도 3은 감속기가 별도로 구성된 종래의 모터를 예시한 사시도3 is a perspective view illustrating a conventional motor in which a speed reducer is separately configured

도 4는 감속기가 별도로 구성된 종래의 모터를 예시한 단면도Figure 4 is a cross-sectional view illustrating a conventional motor separately configured with a reducer

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

10 : 모터10: motor

11 : 구동축11: drive shaft

12 : 감속기어축12: reduction gear shaft

20 : 감속기20: reducer

21 : 기어고정외판21: gear fixing plate

22 : 기어고정내판22: gear fixing inner plate

23 : 베어링23: bearing

24 : 감속기어24: reduction gear

26 : 서포트핀26: Support pin

31 : 축끼움홈31: shaft fit groove

32 : 중간격판32: middle plate

33 : 외측판33: outer plate

34 : 케이스34: case

41A : 1차피니언41A: Primary Pinion

41B : 1차감속기어41B: Primary Reduction Gear

42A : 2차피니언42A: Second Pinion

42B : 2차감속기어42B: Second reduction gear

43A : 3차피니언43A: 3rd Pinion

43B : 3차감속기어43B: 3rd Deceleration Gear

44A : 4차피니언44A: 4th pinion

44B : 4차감속기어44B: 4th reduction gear

45 : 볼트45: bolt

46 : 최종동력전달축46: final power transmission shaft

본 발명은 의료장비의 의자 등에 장착하여 의자 등을 작동시키는 모터(10)에 관한 것이다.The present invention relates to a motor 10 for operating a chair or the like mounted on a chair or the like of a medical device.

이러한 모터(10)는 감속기(20)를 통하여 그 회전수가 저속으로 감속된 최종동력전달축(46)에 의하여 작동체를 움직여야 하기 때문에 이를 위하여 종래의 기술은 모터(10)와 감속기(20)를 각각 제작한 후에 이를 서로 연결하여 사용함으로 인하여 조립작업의 불편함과 소요되는 부품의 수량이 많아지는 단점이 있었다.Since the motor 10 must move the actuator by the final power transmission shaft 46 whose rotation speed is reduced at a low speed through the speed reducer 20, the conventional technology uses the motor 10 and the speed reducer 20 for this purpose. There was a disadvantage in that the inconvenience of the assembly work and the number of parts to be consumed are increased by connecting them to each other after manufacturing each use.

이러한 단점을 개선하기 위하여 본 발명에서는 감속기(20)를 별도로 제작하지 아니하고, 모터(10)의 케이스(34) 내부에 1차피니언(41A) 및 1차감속기어(41B) 내지 4차피니언(44A) 및 4차감속기어(44B)를 내장하여 모터(10)와 일체화될 수 있도록 각 감속기어축(12)의 외측단은 모터(10) 케이스(34)의 외측판(33)이 직접 지지하고, 각 감속기어축(12)의 내측단은 모터(10) 내부의 중간격판(32)에서 직접 지지하도록 구성한 것이다.In order to improve this disadvantage, the present invention does not separately manufacture the reduction gear 20, but the primary pinion 41A and the primary reduction gear 41B to the fourth pinion 44A inside the case 34 of the motor 10. ) And the outer end of each reduction gear shaft 12 are directly supported by the outer plate 33 of the case 10 of the motor 10 so that the fourth reduction gear 44B may be integrated with the motor 10. , The inner end of each reduction gear shaft 12 is configured to be directly supported by the intermediate plate 32 inside the motor 10.

또한, 의료장비의 의자 등의 작동은 소음 및 진동이 없어야 하므로 이를 위하여 본 발명에서는 1차피니언(41A), 1차감속기어(41B), 2차피니언(42A) 및 2차감속기어(42B)를 이(齒)의 접촉면이 단락 현상없이 연속 접촉될 수 있도록 이 끝이 축에 경사진 헬리컬기어로 형성하여 기어에 의한 동력전달에서의 소음 및 진동이 감소되도록 구성한 것이다.In addition, the operation of the chair of the medical equipment, etc. should be no noise and vibration for this purpose in the present invention, the primary pinion (41A), primary reduction gear (41B), secondary pinion (42A) and secondary reduction gear (42B) Helical gears are inclined to the shaft so that the contact surfaces of the teeth can be continuously contacted without short-circuit phenomenon, so that the noise and vibration in power transmission by the gears are reduced.

감속기(20)는 기어(gear)를 이용하여 단위시간당의 회전수를 변환하는 것으로서, 모터(moter)의 회전수를 필요한 회전수로 감속하는 동시에 큰 토크(torque)를 얻을 수 있는 기구적인 장치로서 대부분의 모터는 모터의 회전수를 적절히 감속하고 토크를 증대시키는 감속기를 연결하여 사용한다.The reduction gear 20 converts the rotation speed per unit time by using a gear, and is a mechanical device that can reduce the rotation speed of the motor to the required rotation speed and at the same time obtain a large torque. Most motors use a gearbox that reduces the speed of the motor and increases the torque.

이러한 모터와 감속기는 도 3에서와 같이 모터(10)의 구동축(11)에 별도의 감속기(20)를 연결하여 모터(10)의 회전수를 감속하는 동시에 큰 토크를 얻어 이 회전력을 다양한 장치에 전달하여 사용하였다.Such a motor and a reducer connect a separate reducer 20 to the drive shaft 11 of the motor 10 as shown in FIG. 3 to reduce the rotational speed of the motor 10 and at the same time obtain a large torque to provide this torque to various devices. Transfer was used.

이러한 종래의 모터(10)와 감속기(20)는 서로 달리 제작하여 연결하여야 하 므로 연결작업의 번거로움이 있었을 뿐만 아니라,Since the conventional motor 10 and the reducer 20 have to be manufactured and connected differently, as well as the hassle of connecting work,

감속기에 사용되는 기어들이 회전력 전달만을 위하여 이(齒) 끝이 축에 평행한 평기어를 사용함으로 인하여 평기어의 이의 접촉에서 단락(段落)현상에 의한 소음 및 진동이 발생하는 단점이 있었고,The gears used in the reducer have the disadvantage that noise and vibration are generated due to short-circuit phenomenon at the contact of the spur gears by using spur gears whose teeth are parallel to the shaft only for the transmission of torque.

감속기(20)내부에 각각의 기어축들의 양단을 지지하기 위한 별도의 기어고정외판(21) 및 기어고정내판(22)을 구성한 것이어서 부품소요량이 많아지고 이로 인한 중량화를 초래하는 단점이 있었다.Since the gear fixing inner plate 21 and the gear fixing inner plate 22 for supporting both ends of the gear shafts are configured in the reducer 20, the parts need to be increased and weight is caused.

본 발명은 이러한 문제를 해소하기 위하여 창안한 것으로 모터(10)의 케이스(34) 내부에 단계적으로 4차에 걸쳐 감속할 수 있는 감속기어를 내장하되 소음이 많은 모터(10)의 구동축(11)과의 초반부의 물림에서의 1,2차 감속기어는 단락현상 없이 연속적으로 접촉되는 헬리컬기어로 구성하여 소음을 없애고,The present invention was devised to solve such a problem, but a drive gear 11 of a motor 10 having a high noise is built in a gear reduction gear that can be decelerated in four steps in a case 34 of a motor 10. The 1st and 2nd reduction gears in the bite of the early stage are composed of helical gears which are continuously contacted without short circuit phenomenon to eliminate noise,

후반부의 물림에서의 3,4차 감속기어는 기어이빨의 접촉에서 미끄럼현상이 없이 회전력 전달을 정확히 할 수 있는 평기어로 구성함으로써 소음 없이 회전력을 원활히 전달할 수 있는 기어트레인을 구성하며,The third and fourth reduction gears in the second bite are composed of spur gears that can accurately transmit rotational force without slipping in contact with the gear teeth, thus forming a gear train that can smoothly transmit the rotational force without noise.

종래의 감속기(20)에서의 각 기어축을 지지하기 위하여 감속기(20) 내부에서 별도로 설치하였던 기어고정외판(21) 및 기어고정내판(22)을 제거시키고 각 기어축을 모터(10) 케이스(34)의 외측판(33)과 모터(10) 내부의 중간격판(32)이 직접 지지할 수 있도록 구성하여 부품의 소량화에 의한 경량화를 이루도록 하는 것이 본 발명의 기술적 과제이다.In order to support each gear shaft in the conventional speed reducer 20, the gear fixing outer plate 21 and the gear fixing inner plate 22, which are separately installed in the reduction gear 20, are removed and each gear shaft is removed from the motor 10 case 34. It is a technical object of the present invention to configure the outer plate 33 and the intermediate plate 32 inside the motor 10 so as to be directly supported so as to reduce the weight by the small amount of parts.

종래의 감속기(20)는 도 3 및 도 4에서와 같이 모터(10)에 볼트(45)로서 조립된 감속기(20) 내부의 기어고정외판(21) 및 기어고정내판(22)에 베어링(23)을 매개로 하여 끼워진 각 감속기어축(12)에 고정된 각 감속기어(24)들이 모터(10)의 구동축(11)의 회전력을 전달받아서 감속되는 동시에 큰 토크(torque)를 얻을 수 있도록 된 것이다.The conventional gear unit 20 has a bearing 23 on the gear fixing outer plate 21 and the gear fixing inner plate 22 inside the reduction gear 20 assembled as a bolt 45 to the motor 10 as shown in FIGS. 3 and 4. Each reduction gear 24 fixed to each reduction gear shaft 12 fitted through the above is received by the rotational force of the drive shaft 11 of the motor 10 so as to decelerate and at the same time obtain a large torque. will be.

그러나 이와 같은 종래의 감속기(20)는 감속기(20) 내부에 감속기어(24)들을 지지하는 기어고정외판(21) 및 기어고정내판(22)을 별도로 구성하여야 하고, 이 기어고정외판(21)과 기어고정내판(22)을 서포트핀(26)으로 고정하여 조립하여야 하므로 조립공정이 번거로운 단점이 있을 뿐만 아니라,However, such a conventional speed reducer 20 must separately configure a gear fixing outer plate 21 and a gear fixing inner plate 22 for supporting the reduction gears 24 in the reduction gear 20, and the gear fixing outer plate 21 is provided. And the gear fixing inner plate 22 to be assembled by fixing the support pins 26, as well as the cumbersome disadvantages of the assembly process,

감속기(20) 내부의 제한된 공간에서의 기어고정외판(21) 및 기어고정내판(22)은 두께가 두꺼울 수 없는 금속판임으로 인하여 장기간 사용하거나 감속기어(24)의 큰 힘이 전달될 경우 비틀림 현상이 발생하여 내구성에 문제가 있고,Since the gear fixing outer plate 21 and the gear fixing inner plate 22 in a limited space inside the reducer 20 are metal plates that cannot be thick, torsional phenomena occur when they are used for a long time or when a large force of the reduction gear 24 is transmitted. Occurs, there is a problem with durability,

감속기(20) 내부에 다수 구성된 평기어의 감속기어(24)는 이끝이 축에 평행한 것이어서 이의 접촉에서 연속접촉될 수 없는 것임으로 인하여 비교적 소음이 크게 발생하는 문제가 있으며,The reduction gear 24 of the spur gear configured in the reducer 20 has a problem that the noise is relatively large because the tip thereof is parallel to the shaft and cannot be continuously contacted at its contact.

모터(10)에 감속기(20)를 볼트(45)등으로 조립하여야 하므로 외관이 보기 싫고 작업이 번거로운 문제가 있었다.Since the reducer 20 should be assembled to the motor 10 with bolts 45 or the like, there is a problem that the appearance is not good and the work is cumbersome.

따라서 본 발명은 도 1 및 도 2에서와 같이 모터(10) 케이스(34)의 내부에서 구동축(11)의 회전수가 4차에 걸쳐서 감속될 수 있도록 1차피니언(41A)과 맞물리는 1차감속기어(41B), 2차피니언(42A)과 맞물리는 2차감속기어(42B), 3차피니언(43A)과 맞물리는 3차감속기어(43B) 및 4차피니언(44A)과 맞물리는 4차감속기어(44B)를 설치하되,Therefore, the present invention, as shown in Figs. 1 and 2, the first reduction in engagement with the primary pinion (41A) so that the rotational speed of the drive shaft 11 in the interior of the motor 10, case 34 can be reduced over four orders of magnitude. 4th gear that meshes with gear 41B, 2nd reduction gear 42B which meshes with 2nd pinion 42A, 3rd reduction gear 43B which meshes with 3rd pinion 43A and 4th pinion 44A. Install shorthand gear (44B),

동력전달 초반부의 1차피니언(41A), 1차감속기어(41B), 2차피니언(42A) 및 2차감속기어(42B)는 이끝이 축에 경사져서 연속접촉할 수 있는 헬리컬기어로 형성하여 소음 및 진동이 없도록 하고,The first pinion 41A, the first reduction gear 41B, the second pinion 42A and the second reduction gear 42B at the beginning of the power transmission are formed by a helical gear that can be in continuous contact with its tip inclined to the shaft. To avoid noise and vibration,

동려전달 후반부의 3차피니언(43A), 3차감속기어(43B), 4차피니언(44A) 및 4차감속기어(44A)는 이끝이 축에 평행하여 미끄럼현상 없이 강력히 물려서 동력을 전달 할 수 있는 평기어로 형성하여,The third pinion (43A), the third reduction gear (43B), the fourth pinion (44A) and the fourth reduction gear (44A) in the second half of the dongling transmission can transmit power by virtue of the non-slip phenomenon that this end is parallel to the axis. Formed with spur gears,

기어에 의한 회전력 전달에서의 소음을 없애고 미끄럼현상을 없게 한 상태에서 구동축(11)의 높은 회전수가 저속으로 감속된 최종동력전달축(46)에 의하여 작동체를 움직이도록 구성한 것이다.The high rotational speed of the drive shaft 11 is configured to move the actuator by the final power transmission shaft 46 decelerated at a low speed in a state in which the noise in the rotational force transmission by the gear is eliminated and the sliding phenomenon is eliminated.

소형경량화를 위하여 종래에 사용하던 기어고정을 위한 기어고정외판(21) 및 기어고정내판(22)을 없애버리고 각 감속기어축(12)의 외측단은 모터(10) 케이스(34)의 외측판(33)에 형성된 축끼움홈(31)에 베어링(23)을 매개로 하여 직접 끼우고,The gear fixing outer plate 21 and the gear fixing inner plate 22 for gear fixing, which are conventionally used for small size and light weight, are removed, and the outer end of each reduction gear shaft 12 is an outer plate of the motor 10 case 34. Directly inserted through the bearing 23 to the shaft fitting groove 31 formed in (33),

감속기어축(12)의 내측단은 모터(10) 내부의 중간격판(32)에 형성된 축끼움홈(31)에 베어링(23)을 매개로 하여 직접 끼워서 구성한 것이다.The inner end of the reduction gear shaft 12 is configured by directly inserting the shaft 23 into the shaft fitting groove 31 formed in the intermediate plate 32 inside the motor 10 via the bearing 23.

부품의 소량화를 위하여 1차피니언(41A)을 별도로 제작하여 구동축(11)에 끼우지 아니하고 모터(10)의 구동축(11)의 끝단에 헬리컬기로하여 직접형성하여 1차 피니언(41A)을 구동축(11)과 일체로 형성하였다. In order to reduce the amount of parts, the primary pinion 41A is manufactured separately and is not inserted into the drive shaft 11, but is formed directly on the end of the drive shaft 11 of the motor 10 by helical to form the primary pinion 41A. It was formed integrally with 11).

결국, 본 발명의 기술요지는 의료장비의 의자 등을 작동시키는 모터(10)에 있어서,After all, the technical aspect of the present invention in the motor 10 for operating a chair or the like of the medical equipment,

모터(10)의 케이스(34)내부에 1차피니언(41A), 1차감속기어(41B), 2차피니언(42A) 및 2차감속기어(42B)는 이 끝이 축에 경사진 헬리컬기어로 성형하여 설치하고,In the case 34 of the motor 10, the primary pinion 41A, the primary reduction gear 41B, the secondary pinion 42A and the secondary reduction gear 42B have helical gears whose ends are inclined to the shaft. Molded and installed

3차피니언(43A), 3차감속기어(43B), 4차피니언(44A) 및 4차감속기어(44B)는 이끝이 축과 평행한 평기어로 성형하여 설치하되,The third pinion (43A), the third reduction gear (43B), the fourth pinion (44A) and the fourth reduction gear (44B) are formed by forming a spur gear parallel to the axis,

감속기어축(12)의 양단은 케이스(34)의 외측판(33) 및 중간격판(32)의 축끼움홈(31)에 베어링(23)을 매개로 하여 끼워서 구성하고,Both ends of the reduction gear shaft 12 are formed by inserting the outer plate 33 of the case 34 and the shaft fitting groove 31 of the intermediate plate 32 via the bearing 23,

1차피니언(41A)은 모터(10)의 구동축(11)과 단일체로 하여 구동축(11)의 끝단에 헬리컬기어로 성형한것을 특징으로 하는 감속기어가 내장된 모터(11)이다.The primary pinion 41A is a motor 11 incorporating a reduction gear, characterized in that the helical gear is formed at the end of the drive shaft 11 as a single body with the drive shaft 11 of the motor 10.

이상과 같이 본 발명의 감속기어가 내장된 모터(10)는 의료장비의 의자 등에 장착하여 의자 등을 작동시키는 모터(10)로 사용할 경우 소음 및 진동을 획기적으로 감소할 수 있을 뿐만 아니라 모터(10)의 소형경량화를 이룰수 있는 효과를 기대할 수 있는 발명이다.As described above, the motor 10 incorporating the reduction gear of the present invention may be used as a motor 10 for operating a chair, etc., mounted on a chair of a medical device, as well as significantly reducing noise and vibration, as well as the motor 10. The invention can be expected to achieve the effect of compact and lightweight.

Claims (1)

의료장비의 의자 등을 작동시키는 모터(10)에 있어서,In the motor 10 for operating a chair or the like of the medical equipment, 모터(10)의 케이스(34)내부에 1차피니언(41A), 1차감속기어(41B), 2차피니언(42A) 및 2차감속기어(42B)는 이끝이 축에 경사진 헬리컬기어로 성형하여 설치하고,The primary pinion 41A, the primary reduction gear 41B, the secondary pinion 42A and the secondary reduction gear 42B in the case 34 of the motor 10 are helical gears whose ends are inclined to the shaft. Molded and installed, 3차피니언(43A), 3차감속기어(43B), 4차피니언(44A) 및 4차감속기어(44B)는 이끝이 축과 평행한 평기어로 성형하여 설치하되,The third pinion (43A), the third reduction gear (43B), the fourth pinion (44A) and the fourth reduction gear (44B) are formed by forming a spur gear parallel to the axis, 감속기어축(12)의 양단은 케이스(34)의 외측판(33) 및 중간격판(32)의 축끼움홈(31)에 베어링(23)을 매개로 하여 끼워서 구성하고,Both ends of the reduction gear shaft 12 are formed by inserting the outer plate 33 of the case 34 and the shaft fitting groove 31 of the intermediate plate 32 via the bearing 23, 1차피니언(41A)은 모터(10)의 구동축(11)과 단일체로 하여 구동축(11)의 끝단에 헬리컬기어로 성형한것을 특징으로 하는 감속기어가 내장된 모터.The primary pinion (41A) is a motor with a reduction gear, characterized in that formed as a single body with the drive shaft (11) of the motor (10) formed at the end of the drive shaft (11) with a helical gear.
KR1020070023622A 2007-03-09 2007-03-09 A reduction geared motor KR100733275B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100947863B1 (en) 2008-07-23 2010-03-15 남성덕 Decelerator internal organs style motor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5785546A (en) * 1980-11-15 1982-05-28 Matsushita Electric Works Ltd Both-side shaft motor
JPH08308177A (en) * 1995-04-28 1996-11-22 Oriental Motor Co Ltd Motor with speed reducer
JP2000014082A (en) 1998-06-26 2000-01-14 Matsushita Electric Ind Co Ltd Motor with mechanical reduction gear
KR20000054636A (en) * 2000-06-15 2000-09-05 이한상 geared motor and antenna driving apparatus using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5785546A (en) * 1980-11-15 1982-05-28 Matsushita Electric Works Ltd Both-side shaft motor
JPH08308177A (en) * 1995-04-28 1996-11-22 Oriental Motor Co Ltd Motor with speed reducer
JP2000014082A (en) 1998-06-26 2000-01-14 Matsushita Electric Ind Co Ltd Motor with mechanical reduction gear
KR20000054636A (en) * 2000-06-15 2000-09-05 이한상 geared motor and antenna driving apparatus using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100947863B1 (en) 2008-07-23 2010-03-15 남성덕 Decelerator internal organs style motor

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