scholarly journals Kinematic Analysis of Epicyclic-Type Transmission Mechanisms Using the Concept of Fundamental Geared Entities

1995 ◽  
Author(s):  
Hsin-I Hsieh ◽  
Lung-Wen Tsai
Keyword(s):  
Kinematic Analysis ◽  
Transmission Mechanism ◽  
Speed Ratio ◽  
Transmission Mechanisms ◽  
Kinematic Characteristics ◽  
Epicyclic Gear ◽  
Gear Mechanism

Abstract The kinematic characteristics associated with fundamental geared entities are investigated. By decomposing an epicyclic gear mechanism into two subsystems and each subsystem into two subsystems until the lowest level subsystem contains only one fundamental geared entity, the overall speed ratio of an epicyclic gear mechanism can be conveniently expressed in terms of the speed ratios of the fundamental geared entities. The result can be applied for the identification of feasible clutching sequences of a transmission mechanism.

scholarly journals Kinematic Analysis of Epicyclic-Type Transmission Mechanisms Using the Concept of Fundamental Geared Entities

1996 ◽  
Vol 118 (2) ◽  
pp. 294-299 ◽  
Author(s):  
Hsin-I Hsieh ◽  
Lung-Wen Tsai
Keyword(s):  
Kinematic Analysis ◽  
Transmission Mechanism ◽  
Speed Ratio ◽  
Ratio Analysis ◽  
Symbolic Manipulation ◽  
Transmission Mechanisms ◽  
Operation Modes ◽  
Kinematic Characteristics ◽  
Epicyclic Gear ◽  
Gear Mechanism

A new methodology for the speed ratio analysis of epicyclic-type transmission mechanisms is presented. First, the kinematic characteristics associated with various operation modes of fundamental geared entities are investigated. Then, it is shown that the overall speed ratio of an epicyclic gear mechanism can be expressed in terms of its fundamental geared entities. This method leads to an automated derivation of the speed ratio of an epicyclic-type transmission mechanism without the need of a symbolic manipulation software.

The Selection of a Most Efficient Clutching Sequence Associated With Automatic Transmission Mechanisms

1998 ◽  
Vol 120 (4) ◽  
pp. 514-519 ◽  
Author(s):  
H.-I. Hsieh ◽  
L.-W. Tsai
Keyword(s):  
Power Loss ◽  
Automatic Transmission ◽  
Transmission Mechanism ◽  
Torque Distribution ◽  
Transmission Mechanisms ◽  
Epicyclic Gear ◽  
Gear Mechanism ◽  
Selection Of

This paper presents a methodology for the identification of a most promising clutching sequence associated with an epicyclic-type automatic transmission mechanism. First, a methodology for the analysis of torque distribution on the links of an epicyclic gear mechanism is described. Then, the power loss relations associated with various clutching sequences of an epicyclic gear mechanism are derived. Finally, a procedure for the selection of a most efficient clutching sequence associated with a transmission mechanism is developed.

Nomographs for Enumeration of Clutching Sequences Associated With Epicyclic-Type Automatic Transmission Mechanisms

2008 ◽  
Author(s):  
Essam L. Esmail
Keyword(s):  
Automatic Transmission ◽  
Root Cause ◽  
Transmission Mechanisms ◽  
Epicyclic Gear ◽  
Angular Velocities ◽  
Gear Mechanism ◽  
Gear Trains ◽  
Exact Size ◽  
Algorithmic Techniques ◽  
Transmission Gear

A new methodology for the enumeration of feasible clutching sequences for a given epicyclic gear mechanism (EGM) is presented using the kinematic nomographs of epicyclic-type transmission mechanisms. From such nomographs, the kinematic characteristics of an epicyclic gear mechanism can be expressed in terms of the gear ratios of its gear pairs. From a single nomograph, the angular velocities for all of the coaxial links can be estimated and compared directly without specifying the exact size of each gear. In addition, the angular velocities can be arranged in a descending sequence without using complicated artificial intelligence or algorithmic techniques. Then, a procedure for the enumeration of feasible clutching sequences associated with a transmission mechanism composed of two or more fundamental gear entities (FGEs) is developed. The reliability of the methodology is established by applying it to two transmission gear trains for which solutions are either fully or partially available in the literature. In the process, an incomplete in the results reported in previous literature is brought to light. And the root cause of this incompleteness is explored. The present methodology is judged to be more efficient for enumeration of all feasible clutching sequences of an EGM.

An Analytic Methodology for the Kinematic Synthesis of Epicyclic Gear Mechanisms

2002 ◽  
Vol 124 (3) ◽  
pp. 574-576 ◽  
Author(s):  
Cheng-Ho Hsu
Keyword(s):  
Transmission Mechanism ◽  
Speed Ratio ◽  
Analytic Method ◽  
Kinematic Synthesis ◽  
Epicyclic Gear

This paper presents an analytic method for the determination of the gear ratios of an epicyclic-type transmission mechanism for a given set of speed ratios. For the transmission mechanism with the associated clutching sequence table, the overall speed ratios are first derived and expressed in terms of the gear ratios of all the mating gears using the concept of fundamental geared entities. Next, the associated speed ratio relations are derived as a criterion to detect the feasibility of any given set of speed ratios. Finally, the transmission mechanism is decomposed into a system of fundamental geared entities such that the gear ratios of all the mating gears are determined from given speed ratios in an analytic way.

DEVELOPMENT OF 3-SPEED REAR HUB BICYCLE TRANSMISSIONS WITH GEAR-SHIFTING MECHANISMS

2015 ◽  
Vol 39 (3) ◽  
pp. 407-418 ◽  
Author(s):  
Yi-Chang Wu ◽  
Che-Wei Chang
Keyword(s):  
Design Process ◽  
Power Flow ◽  
Installation Space ◽  
Speed Ratio ◽  
Systematic Design ◽  
Gear Teeth ◽  
Design Concepts ◽  
Embodiment Design ◽  
Epicyclic Gear ◽  
Gear Mechanism

Rear hub bicycle transmissions require less maintenance and are more reliable than rear derailleurs. This study proposes a systematic design process for the conceptual design of 3-speed rear hub bicycle transmissions. By analyzing the kinematics of a basic epicyclic gear mechanism using the fundamental circuit method, the gear sequence and clutching sequence arrangements for 3-speed rear hub transmissions can be obtained. The numbers of gear-teeth for all gear elements resulting in a minimum installation space and satisfying the required speed ratio at each gear stage are determined. A gear-shifting mechanism is constructed to sequentially control the power-flow path within the epicyclic gear mechanism so as to provide three forward gears. An atlas of 3-speed rear hub bicycle transmissions is listed, where three devices are new design concepts and are suitable for further embodiment design. The results of this study will lead to the creation of new multi-speed rear hub bicycle transmissions.

Power Loss Analysis and the Selection of a Most Efficient Clutching Sequence Associated With an Automatic Transmission Mechanism

1997 ◽  
Author(s):  
Hsin-I Hsieh ◽  
Lung-Wen Tsai
Keyword(s):  
Power Loss ◽  
Automatic Transmission ◽  
Transmission Mechanism ◽  
Torque Distribution ◽  
Loss Analysis ◽  
Epicyclic Gear ◽  
Gear Mechanism ◽  
Selection Of

Abstract This paper presents a methodology for the identification of a most promising clutching sequence associated with an epicyclic-type automatic transmission mechanism. First, a methodology for the analysis of torque distribution on the links of an epicyclic gear mechanism is described. Then, the power loss relations associated with various clutching sequences of an epicyclic gear mechanism are derived. Finally, a procedure for the selection of a most efficient clutching sequence associated with a transmission mechanism is developed.

Kinematic Analysis of an 8-Speed Bicycle Transmission Hub

2013 ◽  
Vol 479-480 ◽  
pp. 234-238 ◽  
Author(s):  
Yi Chang Wu ◽  
Pei Wun Ren ◽  
Li An Chen
Keyword(s):  
Kinematic Analysis ◽  
Power Flow ◽  
Planetary Gear ◽  
Speed Ratio ◽  
Flow Paths ◽  
Gear Teeth ◽  
Gear Mechanism ◽  
Flow Diagrams ◽  
Internal Gear ◽  
Planetary Gear Mechanism

A transmission hub is a speed changing mechanism which is an important device in the transmission system of bicycles. This paper presents the kinematic analysis of an 8-speed bicycle transmission hub by using the fundamental circuit method. First, a distributed-flow type planetary gear mechanism, which consists of two parallel-connected transmission units and one differential unit, and the corresponding clutch sequence table of an 8-speed transmission hub are introduced. Based on the fundamental circuits, four kinematic equations of the transmission hub are derived. Then, the speed ratio of each speed is formulated, which is a function of gear ratios of external and internal gear pairs. By submitting the numbers of gear teeth into these formulas, the value of speed ratio at each speed can be calculated. Finally, the power-flow diagrams at related speeds are presented to illustrate the power-flow paths of the transmission hub.

Conceptual Design of a 16-Speed Bicycle Drive Hub

2011 ◽  
Vol 52-54 ◽  
pp. 279-284 ◽  
Author(s):  
Yi Chang Wu ◽  
Shi Liang Lin
Keyword(s):  
Conceptual Design ◽  
Kinematic Analysis ◽  
Power Transmission ◽  
Velocity Ratio ◽  
Planetary Gear ◽  
Transmission Mechanism ◽  
Gear Train ◽  
Design Approach ◽  
Schematic Diagram ◽  
Gear Mechanism

This paper presents a design approach for the conceptual design of a novel 16-speed bicycle drive hub. First, a distributed-flow type planetary gear train, which consists of two parallel- connected transmission units and one differential unit, for the power transmission mechanism of a bicycle drive hub is proposed. Based on the kinematic analysis of the presented gear mechanism, a feasible clutching sequence is synthesized to provide 16 forward speeds. Then, the numbers of teeth of all gears are determined according to the desired velocity ratio of each speed. As a result, a schematic diagram of the embodiment of the proposed 16-speed drive hub is presented.

Similarity and Equivalence of Nutating Mechanisms to Bevel Epicyclic Gear Trains

2003 ◽  
Author(s):  
Carl A. Nelson ◽  
Raymond J. Cipra
Keyword(s):  
Kinematic Analysis ◽  
Power Flow ◽  
Bevel Gear ◽  
Static Force ◽  
Main Motivation ◽  
Kinematic Characteristics ◽  
Epicyclic Gear ◽  
Speed Reducer ◽  
Gear Trains

This paper addresses similarities between various nutating or wobbling mechanisms, especially kinematic similarities. A case is made for the generalization of several mechanisms into a mechanism “class” having common kinematic characteristics. This mechanism class is shown to be typified by bevel epicyclic gear trains. It is proposed that not only kinematic analysis, but static-force, power-flow, and efficiency analyses of mechanisms belonging to this “class” can be simplified by modeling them as bevel-gear trains. Simplified kinematic, force, and efficiency analyses are demonstrated for a novel wobbling speed reducer using this concept of “equivalent” geared mechanisms. The reduction in complexity of these analyses is the main motivation for this work.

Enumeration of Feasible Clutching Sequences of Epicyclic Gear Mechanisms

2010 ◽  
Vol 132 (7) ◽  
Author(s):  
Shaker S. Hassan
Keyword(s):  
Artificial Intelligence ◽  
Velocity Ratio ◽  
Automatic Transmission ◽  
Gear Train ◽  
Artificial Intelligence Technique ◽  
Transmission Mechanisms ◽  
Epicyclic Gear ◽  
Gear Mechanism ◽  
Algorithmic Technique ◽  
Intelligence Technique

A new methodology for enumeration of feasible clutching sequences of epicyclic gear mechanism (EGM) composed of two or more fundamental gear entities is presented. The method relies on previous work on algorithmic technique. It improves on existing techniques used for automatic transmission mechanisms in its ability to accurately solve the kinematics of geared mechanisms and estimating their velocity ratios and arranging them in a descending order in a simpler manner without depending on certain gear sizes. Twelve velocity-ratio-relations are derived for any four coaxial links of an epicyclic gear train. These velocity-ratio-relations are three more than the nine relations given in literature. In addition, the velocity ratios can be arranged in a descending sequence without using complicated artificial intelligence technique or complicated computer algorithm. The present methodology is judged to be more efficient for enumeration of all feasible clutching sequences of an EGM.

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