An assemblability check methodology for the kinematic configurations of automatic transmission planetary gear trains

Kwon, Hyun Sik; Kahraman, Ahmet

doi:10.1007/s12206-016-1129-y

Cited by 9 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Planetary gears are extremely widely used in industrial transmission equipment. [1][2][3] The vibration and mechanical properties have a great influence on the whole equipment. 4,5 Besides, the planetary gear is a multi-parameter excitation system.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional dynamic modeling and analytical method investigation of planetary gears for vibration prediction

Zhang

Wang

Bao

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part K:

View full text Add to dashboard Cite

The investigation of planetary gear dynamics including dynamic modeling and dynamic response analysis is a crucial approach in vibration reduction of industrial power transmission systems. In this paper, the nonlinear, time-varying dynamic model of a spur planetary gear system under consideration of the translational and rotational motions is investigated. The three subsystems for sun-planet, ring-planet and planet-carrier are analyzed subsequently, and the dynamic equations of the system are obtained. Moreover, different planet phasing and spacing configurations can be described by means of this model. In addition, the dynamic response is investigated by the multiple-scale method. First, the analytical solutions of the primary, superharmonic and subharmonic resonances are obtained. Then the frequency amplitude curves of different resonance modes are compared and the influence of some parameters on the vibration amplitude is studied. Meanwhile, the accuracy of the analytical solutions is evaluated by the numerical integration simulations. The results show that the frequency-amplitude curves of the primary and superharmonic resonance are similar in shape, the three solutions coexist, and the types of unstable solutions and stable solutions are identical. Furthermore, the softening nonlinearity of the subharmonic amplitude-frequency curve is more obvious under the three-dimensional model. This research is an important development of three-dimensional dynamic modeling and vibration prediction of planetary gears, and also improves the efficiency and accuracy of dynamic response calculation.

show abstract

Section: Introductionmentioning

confidence: 99%

Three-dimensional dynamic modeling and analytical method investigation of planetary gears for vibration prediction

Zhang

Wang

Bao

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part K:

View full text Add to dashboard Cite

show abstract

“…del Castillo [18] proposed a graph-based method to construct a basic structure of a planetary gear train by enumerating connections for central members of planetary gear sets. Related to a given basic structure, Kwon and Kahraman [19] presented a graph-based method to investigate if a given schematic structure can be assembled in rotation plane. For designing planetary gear sets, several earlier publications [20][21][22][23] suggested design methods defining gear geometry parameters and avoiding interference conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Influences of Thrust Loads Resulted by Helix Angle Directions of Planetary Gear Sets on Bearing Power Losses in Automotive Planetary Gear Trains

Kwon

2021

Applied Sciences

Self Cite

View full text Add to dashboard Cite

In the recent automotive industries, automotive technologies for improving fuel efficiency have focused on the developments of reducing power losses in a transmission. As a well-developed and conventional power transmitting system, an automatic transmission is still widely used in many automotive vehicles. The automatic transmission is co-axially designed with several planetary gear sets and other mechanical parts. The co-axial arrangements and gear helix angles make the transmission necessarily include bearings for supporting loads and allowing relative rotations. In this study, the influences of thrust loads yielded by helix angle directions of planetary gear sets on bearing power losses are presented by performing the structural and power loss analysis. Bearing power losses consist of mechanical and spin power losses. For calculating thrust loads and bearing rotations, a complete transmission model is constructed by using an example structure, and structural analysis is performed for the combinations of helix angle directions of the gear sets. Finally, bearing power losses are computed by using the bearing power loss model, and the results of the entire combinations of helix angle directions are discussed.

show abstract

“…In planetary gear sets, multiple planet gears are used to form power split and planetary gears provide higher power density than parallel axis gears [1]. The planetary gear set has been widely applied in wind turbines [2] and automatic transmissions [3,4]. It uses three or more spaced planet gears.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Static Load Sharing Characteristics of a Planetary Gear Set with Planet Journal Bearings

Zhi-qiang

Li²,

et al. 2020

Applied Sciences

View full text Add to dashboard Cite

The quasi-static load sharing characteristics of a planetary gear set with planet journal bearings are numerically investigated. The application of journal bearings instead of rolling bearings in planetary gear sets is an alternative to increase the rotation speed. Therefore, an effective analysis method is needed to estimate the dynamic performance of a planetary gear set with planet journal bearings. Here, an available load sharing factor computation method is developed considering the effect of the variable journal bearing stiffness. Results of an experiment are used to validate the effectiveness of the computation method. Furthermore, the load sharing characteristics of a planetary gear set with planet journal bearings are influenced by bearing parameters and operating conditions significantly due to the changing bearing stiffness of journal bearings. The effects on the load sharing factor and the bearing stiffness are studied in detail simultaneously based on the proposed analysis method. The load sharing factor of a planetary gear set with planet journal bearings has a similar variation with the bearing support stiffness under the same load. These researches provide a theoretical basis for the application of journal bearings in planetary gear sets.

show abstract

An assemblability check methodology for the kinematic configurations of automatic transmission planetary gear trains

Cited by 9 publications

References 7 publications

Three-dimensional dynamic modeling and analytical method investigation of planetary gears for vibration prediction

Three-dimensional dynamic modeling and analytical method investigation of planetary gears for vibration prediction

Investigation of the Influences of Thrust Loads Resulted by Helix Angle Directions of Planetary Gear Sets on Bearing Power Losses in Automotive Planetary Gear Trains

Quasi-Static Load Sharing Characteristics of a Planetary Gear Set with Planet Journal Bearings

Contact Info

Product

Resources

About