• Proceedings of the Korean Institute of Industrial Safety Conference
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• 1998.11a
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• pp.241-246
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• 1998

기어는 동력을 전달, 전환하고 있는 기계요소로 회전비의 선택이 자유롭고 확실한 전달비를 가지고 있어 기계회전계에 많이 이용되고 있다. 최근 산업이 고도로 발전함에 따라 기계회 전계는 고속, 고부하, 정밀화, 경량화가 요구되고 있으며, 기어구동계도 신뢰도, 정숙성, 효율향상, 내구성 등이 요구되고 있다. 최근에는 진동과 소음의 발생으로 인해 기어구동계의 많은 성능을 저하시키고 있어 저진동, 저소음 기어 개발이 시급한 실정이다. (중략)

• Journal of the Korean Institute of Gas
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• v.26 no.2
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• pp.21-26
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• 2022

Since the four-wheel drive transmits the driving force to all four wheels, the traction with the road surface increases, thereby increasing the driving force. However, it has the disadvantage of lowering fuel efficiency. Therefore, four-wheel drive is commonly used as a method of converting to optional four-wheel drive when necessary while driving in two-wheel drive. This selective four-wheel drive converts the driving force by mechanically changing the electric signal sent by the driver in the transfer case. In this study, in order to mechanically change the electrical signal, a reducer is applied to the motor to increase the torque to perform the function. Therefore, in this study, a reduction mechanism applicable to the motor inside the transfer case applied to convert the drive is derived, and the reduction ratio applying the planetary gear type is optimized accordingly. And based on the derived reduction ratio, two sets of planetary gears using a ring gear in common were applied to develop a planetary gear tooth type in which the input shaft and output shaft are decelerated in the same phase. Optimization design was carried out.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 1998.05a
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• pp.25-30
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• 1998

최근 산업이 발달함에 따라 기계회전계는 고속화, 정밀화 그리고 고부하에 따른 성능 향상과 내구성이 요구되고 있으면 기어 구동계는 강성, 효율향상, 저진동, 저소음 기어의 개발이 요구되고 있다. 그러나 기어는 제작오차, 조립오차, 치의 변형, 마모등으로 인하여 전달오차가 발생하게된다. (중략)

• Journal of Advanced Marine Engineering and Technology
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• v.39 no.3
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• pp.211-216
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• 2015

Large hydraulic excavator weighted 90 tons used the several pumps installed in parallel to use the hydraulic pump driving gearbox to improve fuel consumption by improving the energy efficiency of the hydraulic system. Gearbox connected to hydraulic pump supply the mechanical output to the high pressure and low pressure pump to be supplied by torque and rotation, which are the mechanical power, through a input shaft connected to large size engine of the excavator. So, gearbox connected to hydraulic pump is same as main artery in the human body and is required long life because it operates the hydraulic pump continuously during operating the engine. This study had used oil contamination analysis method to check the wear characteristics of the gearbox and frequency response characteristic analysis method to check the failure of the teeth failures of gearbox, while the test equipment adopted by the electrical feedback method to reduce the energy consumption was operating for the life assessment, in which the required power was 600 kW input power.

• Journal of Energy Engineering
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• v.25 no.3
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• pp.51-58
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• 2016

MLCC is key parts of many electronic products and mixer is used to make MLCC. Currently, non-contact mixer is increasingly used due to its many merits. In case of large capacity non-contact mixer, function of driving gear is important. In this study, therefore, in order to reduce manufacturing cost through optimal design of driving gear of large capacity non-contact mixer, study on shape optimization of driving gear without excessive design modification was performed. As the results, because safety factors of modification model were decreased about 3.0 ~ 3.5 times compared with those of model with robust design, the possibility for saving manufacturing cost was confirmed.

• Journal of the Korean Institute of Gas
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• v.26 no.2
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• pp.9-13
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• 2022

Electric wheelchairs, the output from the motor is mainly applied to a speed reducer using a power transmission device such as a belt or a chain. However, although a speed reducer using a belt or chain is a simple device, it occupies a lot of space and has a space limitation, so it is not suitable for an electric wheelchair driving part. However, since the speed reducer of the planetary gear type is decelerated on the same axis, the volume can be reduced, so the space constraint is less than that of the belt or chain type reducer. Therefore, in this study, a driving part that can obtain great propulsion with a speed reducer using a planetary gear type was developed through a study on the driving part of a wheelchair that can be switched between manual and electric. Accordingly, the tooth shape of the planetary gear applied to the reducer was designed using the Kisssoft program. In addition, the drive part was designed to be applicable to the existing wheelchair wheels, and the mechanism was optimized for the manual/electric switching principle and operation principle of the drive part. Based on the research contents, the final design and manufacture of the wheelchair reducer drive unit in the form of a planetary gear having one sun gear, two planetary gears and one ring gear was carried out.

• Journal of the Korean Society of Propulsion Engineers
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• v.20 no.4
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• pp.19-25
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• 2016

Using a actuator to which the motor and the gear is applied to the I-PD control method and a dual-loop system to carry out precise position control. I-PD control algorithm performs an operation to reduce the overshoot in the transient response. Accordingly, the actuator obtains a precise position tracking result. Also it utilizes two sensors and dual loops. It reduces the adverse effect on the precise position control that may occur by the end play of the gear train. In this paper, we uses the actuator model applying the BLDC motor and gear in order to determine the position tracking result by the dynamic characteristic change. It was verified by the simulation results.

• The Journal of the Convergence on Culture Technology
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• v.10 no.5
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• pp.687-692
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• 2024

Recently, electric skateboards have been used as a means of personal transportation due to their convenience and simplicity of operation, but the conventional skateboards driven by timing belts or hub motors have disadvantages such as low driving torque, high current and vibration. Therefore, in this paper, we propose a new type of electric skateboard that can run at high speeds for long periods of time so that it can be used as a auxiliary means of transportation. The planetary gear and motor unit are combined and installed inside one drive wheel, and power is supplied to the wheel through the integrated driving unit to prevent high currents and enable high-speed driving. First, the allowable current and running speed of the electric skateboard were set for efficient personal transportation and the appropriate reduction ratio, modules, and planetary gear dimensions were determined by comparing the torque required for the wheel axis and the maximum output torque of the motor. Additionally, an appropriate suspension device was added to reduce driving vibration for user convenience, and the feasibility of the proposed in-wheel gearbox was experimentally verified through fabrication.

• Journal of Aerospace System Engineering
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• v.17 no.6
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• pp.27-34
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• 2023

This paper presents the application of a magnetic gear to the electric propulsion system for an aircraft. Since high torque is required in aircraft electric propulsion systems, combining a speed reducer can amplify the torque. However, mechanical gears have issues, such as friction, vibration, and heat generation, which lead to maintenance challenges. In the case of a direct-drive motor that does not use mechanical gears, the size and weight of the motor increase to achieve high torque. This paper proposes the application of a magnetic gear to solve the maintenance issues of mechanical gears and the weight increase problem of direct-drive motors in aircraft electric propulsion systems. In this paper, a magnetic gear suitable for aircraft electric propulsion systems is designed, and it is compared with a direct-drive motor in terms of performance and the feasibility of applying the magnetic gear is verified.

• Proceedings of the KSME Conference
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• 2005.11a
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• pp.104.2-104.2
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• 2005