Design Charts for the Three-Gear Drive

1973 ◽  
Vol 95 (1) ◽  
pp. 280-282
Author(s):  
G. H. Michaud ◽  
A. S. Hall
Keyword(s):  
Input Output ◽  
Motion Mechanism ◽  
Gear Drive ◽  
Design Charts ◽  
Motion Characteristics ◽  
Intermittent Motion

As an intermittent motion mechanism the three-gear drive offers several easily obtained motion characteristics. The design regions in which these characteristics are found are defined by particular input/output velocity and acceleration equations which are presented graphically by a series of design charts.

scholarly journals Study on High-Speed Intermittent Motion Mechanism. Comparison Indexing Cam Mechanism with Servo-System.

2002 ◽  
Vol 68 (668) ◽  
pp. 1191-1197
Author(s):  
Masatoshi HIKIZU ◽  
Hiroaki SEKI ◽  
Yoshitsugu KAMIYA ◽  
Hiroshi TACHIYA ◽  
Hisanao NOMURA
Keyword(s):  
High Speed ◽  
Servo System ◽  
Motion Mechanism ◽  
Cam Mechanism ◽  
Intermittent Motion

On the Motion Characteristics of Tripode Joints. Part 1: General Case

1984 ◽  
Vol 106 (2) ◽  
pp. 228-234 ◽  
Author(s):  
E. Akbil ◽  
T. W. Lee
Keyword(s):  
Constant Velocity ◽  
Analytical Study ◽  
Orbital Motion ◽  
Analytical Investigation ◽  
Rigorous Proof ◽  
Input Output ◽  
Arbitrary Position ◽  
Motion Parameters ◽  
Motion Characteristics ◽  
Output Equation

This paper is concerned with the analytical investigation of the motion characteristics of tripode joints with general proportions and arbitrary position of shafts. It provides a rigorous proof that the tripode joint is not a true constant velocity joint except in ideal cases, and this is due to the inherent orbital motion of the output spider shaft. Algebraic derivations of the input-output equation and explicit relations for motion parameters are presented. From this general analytical study, some insights into the behavior of the tripode joint are observed and interpreted.

General Characteristics of the Motion of Multiple-Pode Joints

1984 ◽  
Vol 51 (1) ◽  
pp. 171-178 ◽  
Author(s):  
T. W. Lee ◽  
E. Akbil
Keyword(s):  
Functional Analysis ◽  
Analytical Method ◽  
Input Output ◽  
Displacement Analysis ◽  
General Displacement ◽  
Motion Parameters ◽  
The Creation ◽  
Motion Characteristics ◽  
And Behavior ◽  
Output Equation

This paper presents an analytical method on the investigation of the motion characteristics of a class of spatial mechanical components involving the ball-and-trunnion type of joint, namely, the multiple-pode joint. Algebraic derivations of the input-output equation and explicit relations for motion parameters are presented for these joints as well as their shaft couplings. From this general displacement analysis, some insights into the basic nature and behavior of the multiple-pode joint are observed and interpreted. The creation of shaft couplings using these joints and their functional analysis are also illustrated in several cases.

Using a Singularity Locus to Exhibit the Number of Geometric Inversions, Transitions and Circuits of a Linkage

2010 ◽  
Author(s):  
David H. Myszka ◽  
Andrew P. Murray ◽  
James P. Schmiedeler
Keyword(s):  
Joint Space ◽  
Degree Of Freedom ◽  
Input Output ◽  
Motion Characteristics ◽  
Singularity Locus

The identification of motion characteristics and assembly circuits is fundamental in creating a workable mechanism. A circuit defect prevents a mechanism from moving between desired positions. This paper extends the established methods for analyzing multi-degree-of-freedom platforms to gain insight on single-actuated linkages. Specifically, from a plot of the singularity locus projected onto the input joint space, the number of singularities, number of geometric inversions and circuit regimes are revealed. The input/output motion of the linkage can be inferred from the locus. The methodology to produce the singularity locus is general and does not rely on geometric insights of a particular mechanism. By using the locus, desired operational features can be readily identified, such as a fully rotatable crank. Unique motion characteristics, such as a greater than 360° non-rotatable crank, can be also be detected. Further, it is observed that transition linkages serve as bounds between the regions of circuit change.

AN INTERMITTENT MOTION MECHANISM INCORPORATING A GENEVA WHEEL AND A GEAR TRAIN

2014 ◽  
Vol 38 (3) ◽  
pp. 359-372 ◽  
Author(s):  
David B. Dooner ◽  
Antonio Palermo ◽  
Domenico Mundo
Keyword(s):  
Gear Train ◽  
Circular Path ◽  
Gear Pair ◽  
Motion Mechanism ◽  
Zero Velocity ◽  
Kinematic Study ◽  
Wheel Drive ◽  
Intermittent Motion

This paper presents a kinematic study of a mechanism incorporating a Geneva wheel and a gear train to achieve intermittent motion. The goal of this mechanism is to eliminate the acceleration jump at the beginning and end of the Geneva wheel motion. An epitrochoidal path replaces the circular path for the driving pin in a classical Geneva wheel drive. The epitrochoidal path is generated using a gear train and results in zero velocity, acceleration, and jerk at the beginning and end of the Geneva wheel motion. Presented is a comparison of the position, velocity, acceleration, and jerk between the classical Geneva wheel mechanism and the proposed mechanism. Subsequently, the motion of the Geneva wheel is modified by introducing a non-circular gear pair to adjust the timing of the epitrochoidal path. The motion of the non-circular gear pair is determined by reducing the extreme jerk of the Geneva wheel.

Design and Validation of A Novel Planar 2R1T Remote Center-of-motion Mechanism Composing of Dual-Triangular and Straight-Line Linkages

2021 ◽  
pp. 1-11
Author(s):  
Genliang Chen ◽  
Yuanhao Xun ◽  
Yuchen Chai ◽  
Siyue Yao ◽  
Chao Chen ◽  
...  
Keyword(s):  
Minimally Invasive ◽  
Degrees Of Freedom ◽  
Fast Recovery ◽  
Positioning Accuracy ◽  
Motion Mechanism ◽  
Small Incision ◽  
Pure Rotation ◽  
Differential Motion ◽  
Straight Line ◽  
Motion Characteristics

Abstract Benefiting from small incision and fast recovery, minimally invasive surgeries (MIS) exhibit great advantages in clinical operations. In such kind of surgeries, the remote center-of-motion (RCM) mechanisms play an important role owing to their special motion characteristics. This paper presents the design of a novel planar RCM mechanism of two rotational and one translational degrees-of-freedom. In the proposed design, the mobility of RCM mechanisms is decomposed into one-DOF pure rotation and translation with a remote stationary point. The dual-triangular linkage and the Peaucellier-Lipkin straight-line linkage are introduced to achieve the remote rotation and translation, respectively. Inspired by the concept of virtual screw, a dual-helical differential-motion joint is particularly designed to generate the coaxial rotation and translation. A preliminary prototype is developed to validate the feasibility of the designed RCM mechanism. The experimental results show that the developed prototype is easy to control and of acceptable positioning accuracy, which manifests potential application in MIS.

Kinematic Synthesis of Spherical Two-Gear Drives With Prescribed Entire-Motion Characteristics: Displacement Analysis and Dwell Characteristics

1983 ◽  
Vol 105 (4) ◽  
pp. 663-671 ◽  
Author(s):  
T. W. Lee ◽  
E. Akbil
Keyword(s):  
Kinematic Synthesis ◽  
Displacement Analysis ◽  
Gear Drive ◽  
Transmission Angle ◽  
Computer Aided ◽  
Displacement Equation ◽  
Synthesis Procedure ◽  
Motion Characteristics ◽  
Joint Consideration ◽  
Gear Drives

This paper presents an analytical and computer-aided procedure on the kinematic synthesis of the spherical two-gear drive with prescribed dwell characteristics. The first part gives a displacement analysis which includes an investigation of the general case of spherical five-link, 5R mechanisms and the spherical geared five-link case. Two approaches, one making use of the spherical trigonometric relations and the other involving sequential coordinate transformations by real and orthogonal [3 × 3] matrices, yield identical input-output expressions. The remainder of the paper focuses on the dwell characteristics of the spherical two-gear drive using algebraic methods based on the displacement equation. Dwell criteria for the general mth-order dwell are derived. A specific example which involves a joint consideration of other entire-motion characteristics, such as limit positions and transmission-angle variations, is given to illustrate both the theory as well as the computer-aided synthesis procedure.

On The Dynamics of Intermittent-Motion Mechanisms. Part 1: Dynamic Model and Response

1983 ◽  
Vol 105 (3) ◽  
pp. 534-540 ◽  
Author(s):  
Ting W. Lee ◽  
A. C. Wang
Keyword(s):  
Dynamic Models ◽  
Damping Ratio ◽  
Relative Displacement ◽  
Dynamical Response ◽  
Damping Force ◽  
Damping Material ◽  
Proposed Model ◽  
Maximum Relative Displacement ◽  
Motion Characteristics ◽  
Intermittent Motion

This paper deals with a basic problem regarding intermittent-motion mechanisms, namely, how to formulate a predicative model for the study of the dynamics of these mechanisms. A mathematical model is developed in this investigation. The model, which includes clearance, damping, material compliance, and mechanism elasticity, is basic to the determination of the dynamical response such as force amplification and motion characteristics of mechanisms with intermittent motion. A new approach in the modeling of system damping is presented. Instead of using damping ratio, which is difficult to estimate accurately, a new damping function is introduced, which characterizes the speed and load dependent nature of damping. Two types of damping functions are proposed and both of their corresponding damping forces satisfy the expected hysteresis boundary conditions, i.e., zero damping force at zero and maximum relative displacement of contact. A comparative study of the present model with conventional dynamic models is performed. It demonstrates the characteristics and the usefulness of the proposed model for the study of the dynamics of intermittent-motion mechanisms.

A Low-Impact Deployment Hinge Based on a Novel Intermittent Mechanism

2014 ◽  
Vol 643 ◽  
pp. 302-309
Author(s):  
Hong Wei Guo ◽  
Zhong Jie Li ◽  
Zong Quan Deng ◽  
Chuang Shi ◽  
Rong Qiang Liu
Keyword(s):  
Angular Velocity ◽  
Mechanism Design ◽  
Impact Force ◽  
Motion Mechanism ◽  
Maximum Impact Force ◽  
The Impact ◽  
Intermittent Motion

A novel intermittent mechanism and low-impact deployment hinge based on intermittent mechanism are presented in this paper. This application is contemplated to lower the impact dramatically at the end of hinge deployment. The overall deployment process is described and the maximum impact force and angular velocity are derived. The effect of the intermittent motion mechanism on free spring deployable hinges is evaluated by indexes of maximum angular velocity and impact force. Cases are simulated to verify the mechanism design, and results show that the maximum angular velocity and impact force can be decreased by more than 90%.

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