Sliding ratio for novel cycloidal gear drive

2017 ◽  
Vol 232 (21) ◽  
pp. 3954-3963
Author(s):  
Lizhong Xu ◽  
Shuang Li ◽  
Wenping Wang
Keyword(s):  
Tooth Profile ◽  
The Novel ◽  
Gear Drive ◽  
Involute Gear ◽  
Wear Life

In this paper, for a novel spur cycloidal gear drive with a modified tooth profile, the equations of the sliding ratio are deduced from those of its tooth profile. Using the sliding ratio equations, the sliding ratio of the novel cycloidal gear drive is investigated and effects of the drive parameters on the sliding ratio are analysed. The sliding ratio of the novel cycloidal gear drive is then compared with that of an involute gear drive. The results show that the sliding ratio of the novel cycloidal gear drive is small and distributed evenly along its rotating angles, which makes the drive operate smoothly and have a long wear life.

Effect of tooth waist order parameters of double involute gears on lubrication performance of gear drive

2016 ◽  
Vol 68 (6) ◽  
pp. 671-675 ◽  
Author(s):  
Zhimin Fan ◽  
Wanfeng Zhou ◽  
Ruixue Wang ◽  
Na Wang
Keyword(s):  
Elastohydrodynamic Lubrication ◽  
Reference Value ◽  
Tooth Profile ◽  
Order Parameters ◽  
Content Type ◽  
Oil Film ◽  
Gear Drive ◽  
Involute Gear ◽  
Lubrication Performance ◽  
Involute Gears

Purpose The purpose of this paper is to derive a new lubrication model of double involute gears drive and study the effect of the tooth waist order parameters of double involute gears on lubrication performance. Design/methodology/approach The new lubrication model of double involute gears drive was established according to the meshing characteristics of double involute gears drive and the finite length line contact elastohydrodynamic lubrication theory. Numerical calculation of the lubrication model of gear drive was conducted using the multigrid method. Findings The results show that the oil film necking phenomenon and the oil film pressure peak emerged at the tooth waist order area and the tooth profile ends, and when compared with involute gear, the lubrication performance at the tooth waist order area is better than that at the tooth profile ends. The effect of tooth waist order parameters on lubrication performance at the tooth waist order area was greater than that at other areas. Originality/value This research will promote the application of the double involute gear as soon as possible, and it has the reference value for other types of gears.

Research on S-gear design, manufacturing and measuring based on NC machining center

2020 ◽  
pp. 095440542098134
Author(s):  
Shao-ying Ren ◽  
Yan-zhong Wang ◽  
Yuan Li
Keyword(s):  
Convex Surface ◽  
Coordinate Measuring Machine ◽  
Nc Machining ◽  
Tooth Profile ◽  
Numerical Control ◽  
Machining Center ◽  
Involute Gear ◽  
Measuring Machine ◽  
Gear Contact ◽  
Nc Machining Center

This article presents a method of design, manufacturing, and measuring S-gear. S-gear is a kind of gear whose tooth profile is an S-shaped curve. The sine (cosine) gear, cycloid gear, polynomial gear, and circular arc gear are all S-gears in essence. In the S-gear transmission, the concave surface of one gear and the convex surface of the other gear contact each other. Therefore, the power transmitted by S-gear is much larger than that of the convex-convex-contact involute gear. Some scholars have studied the characteristics of S-gear, but few have explored its manufacturing. In this article, the Numerical Control (NC) machining technology of S-gear is studied in detail for its industrial application. The polynomial curve is used to construct the tooth profile of the S-gear based on the Gear Meshing Theory. The mathematical model of polynomial S-gear is established, by which involute gear can be represented as a special S-gear. The steps of generating NC codes are described. Then, the S-gear sample is processed with an NC machining center. Finally, the sample is measured with a Coordinate Measuring Machine (CMM), and the measurement results show that the accuracy of the S-gear processed by the NC machining center reaches ISO6. This research provides a feasible approach for the design, manufacturing, and measuring of S-gear.

Motion Simulation of Gears and Cams Using Working Model

1997 ◽  
Author(s):  
Shih-Liang Wang
Keyword(s):  
Complex Geometry ◽  
Gear Tooth ◽  
Tooth Profile ◽  
Line Contact ◽  
Motion Simulation ◽  
The Past ◽  
Working Model ◽  
Simulation Engine ◽  
Involute Gear ◽  
Involute Surface

Abstract Motion simulation of mechanism of line contact like gears and cams has been difficult in the past. With Working Model, NURBS based complex geometry can be modeled fairly easily, and its simulation engine can animate this type of mechanism accurately. In this paper several Working Model files are developed for visualization and analysis. An algorithm to generate involute gear tooth profile is introduced in this paper for the involute and a portion of non-involute surface.

Dynamic Simulation Analysis of Asymmetric Involute Gear Drive System

2012 ◽  
Vol 215-216 ◽  
pp. 974-977 ◽  
Author(s):  
Li Ming Lian ◽  
Gui Min Liu
Keyword(s):  
Dynamic Simulation ◽  
Dynamic Characteristics ◽  
Simulation Analysis ◽  
Dynamic Performance ◽  
Transmission System ◽  
Drive System ◽  
Gear Transmission ◽  
Gear Drive ◽  
Involute Gear ◽  
Gear Transmission System

The dynamic performance of asymmetric involute gear transmission system is analyzed by the MSC.ADAMS software during the paper. By comparative analyzed with the traditional dynamic characteristics of symmetrical involute straight gear transmission, it can be summarized that the asymmetric involute gear transmission system has better vibration characteristics in the course of transmission.

Design of High Ratio Gear Reducer Using Vernier Differential Theory

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Jaehyeock Chang ◽  
Inbae Chang
Keyword(s):  
Static Analysis ◽  
High Ratio ◽  
Tooth Profile ◽  
Planetary Gears ◽  
Simple Mechanism ◽  
Involute Gear ◽  
Wide Range ◽  
Vernier Effect ◽  
Internal Gear

Abstract In this study, we propose a high ratio involute gear reducer using the Vernier effect, so-called Vernier drive. Our design consists of a fixed internal gear, a rotating internal gear, and single-profile planetary gears, which are mounted on a carrier and simultaneously mesh with both internal gears. Since the mechanism requires a design beyond the conventional gear meshing principles, a method to modify the tooth profile of the rotating internal gear is introduced and mathematically verified with exact geometric relations. The performance of the Vernier drive is theoretically studied by quasi-static analysis, and the operation is tested with additively manufactured prototypes. The results demonstrate that the Vernier drive is able to cover a wide range of reduction ratios with a simple mechanism.

Design and Simulation of New Tooth Profile of Flexspline for Harmonic Gear Drive

2015 ◽  
Vol 741 ◽  
pp. 99-107
Author(s):  
Li Zu ◽  
Lan Lan Feng ◽  
Yan Yang Sun
Keyword(s):  
Theoretical Calculation ◽  
Process Simulation ◽  
Cutting Tool ◽  
Parametric Design ◽  
Tooth Profile ◽  
Structure Parameters ◽  
Circular Arc ◽  
Gear Drive ◽  
Calculation Results ◽  
Normal Method

We focused on the parametric design and simulation of new tooth profile “circular arc-involute-circular arc” for flexspline in this paper. Based on the MATLAB software, the basic tooth profile of hob was designed. According to gear generating cutting principle, the simulation of processing for flexspline tooth profile has been realized. By tooth profile normal method, we calculated flexspline tooth profile which is conjugated with the basic tooth profile of the cutting tool, and gave the contrastive studies on process simulation and theoretical calculation. Results show that they are feasible in solving the new tooth profile of flexspline. When changing the key structure parameters, the different changing regulations of flexspline tooth profile can be gained. The research results are meaningful to improve the capacity of harmonic gear drive.

The Effect of Meshing Transmission of Arc Gear by Central Distance Error

2014 ◽  
Vol 889-890 ◽  
pp. 513-517
Author(s):  
Zhong Yi Ren
Keyword(s):  
Contact Line ◽  
Tooth Profile ◽  
Research Results ◽  
Detailed Proof ◽  
Distance Error ◽  
Gear Drive

Arc-gear is sensitive to central distance error, but there havent any literature give detailed proof for how does it sensitive to central distance error. In this article, contact line was analysised, and find that meshing point will move along tooth profile, tansmission ratio will change, overtaking phenomenon appears when there has central distance error, this will cause vibration and noise. The research results is useful for improve arc-gear drive performance.

Meshing Theory of New Epicycloids Gear Drive

2011 ◽  
Vol 383-390 ◽  
pp. 5238-5241
Author(s):  
Yun Na Xue ◽  
Yong Wang ◽  
Zheng Wang
Keyword(s):  
3D Model ◽  
Research Result ◽  
Tooth Profile ◽  
Contact Ratio ◽  
Gear Drive ◽  
Profile Equation ◽  
Pure Rolling ◽  
Basic Parameters ◽  
Meshing Characteristics

In order to realize the pure rolling, improve the contact ratio, remove the backlash and raise the life, a new epicycloids gear drive is put forward. The drive part of the particular mechanism is a wheel with the roller tooth and is called the roller gear. And the driven part is the epicycloids gear. The tooth profile equation is achieved and meshing characteristics is also studied. The basic parameters of the new mechanism are researched and the 3D model is achieved. The research result shows that the new drive is workable and the new mechanism has a wide application prospect.

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