Differential planetary mechanism of reduction gear for robotic applications

This study proposes a novel planetary gear mechanism composed of normal spur gears. Similar to a harmonic drive system, one pair of gears generates differential angular motion to achieve a high reduction gear ratio. While a harmonic drive system utilizes slightly different number of gear teeth between the flex spline and the circular spline to induce differential motion, a planetary gear mechanism with different gear modules is adopted for this purpose in the proposed system. Since the manufacture of special components like the wave generator and flex spline in harmonic drive system is not required here, the machinability and usability are improved. In addition, the mechanism can be achieved with a flat shape, which is crucial for various applications such as robotic systems. After the basic concept and three-dimensional design are introduced, the prototype system is presented.

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S1120101 Research on durability of ultra-micro reduction gear using mechanical paradox planetary gear mechanism

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2015._s1120101- ◽

2015 ◽

Vol 2015 (0) ◽

pp. _S1120101--_S1120101-

Author(s):

Michimasa UCHIDATE ◽

Kentaro SATO ◽

Katsuya KOUNO ◽

Yuuji OGAWA ◽

Shigeko SASAKI ◽

...

Keyword(s):

Planetary Gear ◽

Reduction Gear ◽

Gear Mechanism ◽

Planetary Gear Mechanism

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Analysis of Planetary Gear of Toyota Rush AT 2012

Journal of Mechanical Engineering and Mechatronics ◽

10.33021/jmem.v5i2.994 ◽

2020 ◽

Vol 5 (2) ◽

pp. 57

Author(s):

Adam Fathlevi ◽

Rudi Suhradi Rachmat ◽

Azhari Sastranegara

Keyword(s):

Life Prediction ◽

Power Transmission ◽

Rotation Speed ◽

Planetary Gear ◽

Gear Ratio ◽

Bending Stress ◽

Gear Teeth ◽

High Fatigue ◽

Gear Mechanism ◽

Planetary Gear Mechanism

Gear is one of the most important part of power transmission system in a vehicle, and as the time goes by there possibly some failure happened on the gears. However, there is no information provided by car manufacturer regarding the life and the material of the gears. This report presents the analysis of the planetary gear used in Toyota Rush AT year made of 2012. The objectives of the research are: to study the planetary gear mechanism and how it works; to analyze the force and stress acting on the gears; and to select a suitable gear material that can withstand against the loads that happen on the gear. The research methodology is started with finding the gear dimension and gear ratio. The force acting on gear is calculated based on the torque and rotation speed provided in car specification. Then the selection material is carried out based on the amount of stress applied on the gear teeth that were calculated using AGMA standard formulation. Finally, the fatigue life prediction of the gears is calculated based on the previous stress acting on the gears. The calculation result suggested AISI 1050 steel as the selected gear material that can carry the bending stress of 476 MPa and categorized as low to high fatigue cycle.

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Precise and High Response Measuring Method of Meshing Force of Planetary Gear Mechanism

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.516.469 ◽

2012 ◽

Vol 516 ◽

pp. 469-474

Author(s):

Yuta Morimoto ◽

Toshiki Hirogaki ◽

Eiichi Aoyama ◽

Yasuhiro Uenishi

Keyword(s):

Electric Vehicles ◽

Automotive Industry ◽

Differential Rotation ◽

Planetary Gear ◽

Measuring Method ◽

Power Source ◽

Hybrid Vehicles ◽

Gear Noise ◽

Gear Mechanism ◽

Planetary Gear Mechanism

Recently, technology for electric vehicles (EV) and hybrid vehicles (HEV) has been focused on by the automotive industry to address environmental problems including CO2 reduction [. In particular, in HEV, planetary gears are used to control differential rotation of the motor, engine and generator. For these vehicles, the noise level inside the vehicle is low because the motor is used as the main power source. As a result, further decrease of gear noise is desired compared with the conventional planetary gear mechanism. However, research into the gear noise of the planetary gear mechanism is extremely scarce. Therefore, in this study, we focus on the three axes of I/O rotation, and a new method of measuring the meshing force of the planetary gear mechanism. In this report, a gear-driving device, which is able to make 3-axis differential rotation, was designed for experimentation.

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