scholarly journals Design of Geometrical Parameters and Kinematical Characteristics of a Non-circular Gear Transmission for Given Parameters

2021 ◽  
Vol 11 (3) ◽  
pp. 1000
Author(s):  
Silvia Maláková ◽  
Matej Urbanský ◽  
Gabriel Fedorko ◽  
Vieroslav Molnár ◽  
Samuel Sivak
Keyword(s):  
Design Procedure ◽  
Gear Ratio ◽  
Gear Transmission ◽  
Gear Train ◽  
Final Part ◽  
Geometrical Parameters ◽  
Practical Application ◽  
Center Of Rotation ◽  
Gear Teeth ◽  
Pitch Curve

In this paper, the authors present the design of a suitable gear transmission with the continuously changing gear ratio in the range from 0.5 through 1.0 to 2.0 and back during one revolution of intermeshing gears, according to demands specified for a practical application. The gear train was designed as a pair of identical elliptical gears and the design procedure of the suitable pitch curve (ellipse) is described. The center of rotation of each of the gears is coincident with one of the pitch ellipse foci, so the gears are placed eccentrically. The gear teeth have involute profiles, but the involutes for the active and for the passive tooth sides are different. These are gears with an asymmetrical tooth profile. In the final part, the paper deals with kinematical characteristics of the designed non-circular gear transmission, which differ from the kinematical characteristics of standard circular gear transmissions with a constant gear ratio.

Novel Gear Transmission Mechanism With Twice Unequal Amplitude Transmission Ratio

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
Gaohong Yu ◽  
Zhipeng Tong ◽  
Liang Sun ◽  
Junhua Tong ◽  
Xiong Zhao
Keyword(s):  
Structural Characteristics ◽  
Angular Displacement ◽  
Planetary Gear ◽  
Gear Transmission ◽  
Transmission Mechanism ◽  
Gear Train ◽  
Transmission Ratio ◽  
Gear Pair ◽  
Pitch Curve ◽  
Gear Rack

The operation effectiveness of multi-bar transplanting mechanisms is low, and the specific changing law of the transmission ratio (the curve of the transmission ratio has twice unequal amplitude [TUA] fluctuation.), which is needed in vegetable pot seedling transplanting, is difficult to fulfill using a planetary gear train with noncircular gears and a single-planet carrier. To address this problem, we propose a noncircular gear pair that comprises an incomplete noncircular gear, rack, partial noncircular gear, and elliptical gear. The structural characteristics and the working principle of the TUA gear pair were analyzed. The pitch curve equation of the noncircular TUA gears was derived from the relationship of the angular displacement of the corresponding pitch curves. The influence of central angle α and eccentricity k on the shape of the pitch curve, angular displacement, and transmission ratio of the TUA gear pair was analyzed. The TUA gear pair was applied to a proposed vegetable seedling pickup mechanism (SPM) considering the design requirements. Finally, the feasibility of the new noncircular TUA gear transmission mechanism was verified by an SPM test.

scholarly journals PLANETARY CONTINUOUSLY ADJUSTABLE GEAR TRAIN WITH FORCE CLOSURE OF PLANET GEAR AND CENTRAL GEAR: FROM IDEA TO DESIGN

2018 ◽  
Vol 17 (3) ◽  
pp. 228-237 ◽  
Author(s):  
A. M. Dankov
Keyword(s):  
Elastic Element ◽  
Gear Ratio ◽  
Gear Transmission ◽  
Gear Train ◽  
Gear Design ◽  
Force Closure ◽  
Planet Gear ◽  
Gear Wheels ◽  
Determination Of Parameters ◽  
Central Gear

One of the reasons constraining use of a continuously adjustable gear train with compound poly-sector gear wheels in general and its most perspective version that is a planetary continuously adjustable gear train in particular is its design complexity. For example, a complex design of the mechanism for regulation of transmission gear ratio is specified by the use of involute gearing that requires a presence of backlash and bottom clearances for normal functioning and, therefore, autonomous but synchronous movement of a planet gear, as well as sectors of a central gear. In order to simplify the design of especially this mechanism for continuously adjustable gear train the paper justifies a transition to a backlash-free gearing and during this process either a planet gear or sectors of central gear are forcibly moving for regulation of the transmission ratio without losing contact with the mating element. Contact constancy of interacting elements under load is ensured by their force closure which is meant to overcome an action of gearing forces. The paper describes options for implementation of backlash-free gearing as a result of planet gear and central gear force closure, each variant is characterized by selection of active (controlled) and passive (execution of force closure) gear element. In the case of gear transmission with planet pinion coaxial tooth rims it is appropriate to implement a version with involute gearing, passive planet gear and active gear sectors of central gears. In the case of gear transmission with planet pinion opposite tooth rims the most acceptable option is with the cycloidal pin wheel gear, active planet gear and passive gear sectors of central gears. The paper proposes to carry out the force closure for teeth of gear components by means of an elastic element (a spring). A method for determination of parameters for an elastic element has been described depending on a planet gear design and the paper also shows simplification level in the gear design.

The Efficiency of Gears in Consideration of Gear Size and Skewness of Gear Axes

1978 ◽  
Vol 100 (1) ◽  
pp. 85-91
Author(s):  
Y. Fujii ◽  
S. Shimachi
Keyword(s):  
High Efficiency ◽  
Contact Point ◽  
Gear Ratio ◽  
Gear Transmission ◽  
The Other ◽  
Gear Teeth ◽  
Contact Points ◽  
Transmission Mechanisms ◽  
The Mean ◽  
Instantaneous Axis

From the investigation about the dimensions of skew-axes gears now in common use, the ratio of the pitch radius of pinion to that of gear is found to depend almost only upon the gear ratio. On the other hand, the offset of the gear axes is desired to be as large as possible in usual cases of gear transmission mechanisms. Under these situations, the position of the mean contact point where a pair of gear teeth is expected to transmit power in high efficiency is investigated. The results are as follows: 1) The mean contact point which corresponds to high efficiency is in the neighborhood of the ruled surface swept by the instantaneous axis as the gear ratio continuously varies. 2) The majority of the mean contact points of gears now in use nearly coincide with the point mentioned in 1.

Study on Characteristics of Metal V-Belt Infinitely Variable Power-Split Transmission

2011 ◽  
Vol 383-390 ◽  
pp. 785-789 ◽  
Author(s):  
Hui Pan ◽  
Xing Cai
Keyword(s):  
Planetary Gear ◽  
Gear Ratio ◽  
Gear Transmission ◽  
Gear Train ◽  
Speed Ratio ◽  
Planetary Gear Train ◽  
Power Split ◽  
In Series ◽  
Variable Power ◽  
Changing Rate

Six kinds of torque-splitting and speed-converging metal V-belt IVPST were raised; their global speed ratio and torque ratio of metal V-belt CVT output to metal V-belt IVPST output were derived. Two different torque-splitting and speed-converging metal V-belt IVPSTs were sum up: series and parallel metal V-belt IVPSTs. In series metal V-belt IVPST, speed ratio changing rate and torque ratio were related to gear ratio of planetary gear train and fixed gear transmission, but in parallel metal V-belt IVPST, that were only related to gear ratio of planetary gear train.

scholarly journals A Two-Round Optimization Design Method for Aerostatic Spindles Considering the Fluid–Structure Interaction Effect

2021 ◽  
Vol 11 (7) ◽  
pp. 3017
Author(s):  
Qiang Gao ◽  
Siyu Gao ◽  
Lihua Lu ◽  
Min Zhu ◽  
Feihu Zhang
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Design Method ◽  
Fluid Structure Interaction ◽  
Design Procedure ◽  
Design Parameters ◽  
Geometrical Parameters ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Aerostatic Spindle

The fluid–structure interaction (FSI) effect has a significant impact on the static and dynamic performance of aerostatic spindles, which should be fully considered when developing a new product. To enhance the overall performance of aerostatic spindles, a two-round optimization design method for aerostatic spindles considering the FSI effect is proposed in this article. An aerostatic spindle is optimized to elaborate the design procedure of the proposed method. In the first-round design, the geometrical parameters of the aerostatic bearing were optimized to improve its stiffness. Then, the key structural dimension of the aerostatic spindle is optimized in the second-round design to improve the natural frequency of the spindle. Finally, optimal design parameters are acquired and experimentally verified. This research guides the optimal design of aerostatic spindles considering the FSI effect.

scholarly journals Management Methods and Concepts for Building Competitive Advantage in Hospitality Companies

2014 ◽  
Vol 21 (3) ◽  
pp. 178-183
Author(s):  
Beata Gierczak
Keyword(s):  
Knowledge Management ◽  
Competitive Advantage ◽  
Emerging Market ◽  
Final Part ◽  
Management Process ◽  
Practical Application ◽  
The Core ◽  
Knowledge Based ◽  
Management Concepts ◽  
Market Management

Abstract Introduction. Competitive advantage determines the success of modern enterprises, such as hospitality companies, on the market. In turn, competitive advantage is gained as the result of skillful management, taking into account the factors that characterize the company environment. In the management process, methods and concepts that, when properly applied, facilitate the company's innovative activities play the key role, thus contributing to building competitive advantage. The purpose of this paper is to specify and characterize the methods and management concepts most commonly used by hospitality companies in the process of building competitive advantage. The core benefit of these considerations is that they serve to identify those activities of hospitality companies in which the analyzed methods and concepts found practical application. The final part of the article is devoted to an attempt to identify barriers and problems that significantly limit the use of these methods and concepts. Material and methods. In order to achieve this objective, a survey and interviews were carried out in all three- and four-star hotels in the Rzeszów area in the first quarter of 2012. Results. The results revealed that the concept most commonly used by hoteliers was knowledge-based organization (knowledge management), followed by outsourcing, benchmarking and internal competition, respectively. Conclusions. The study also demonstrated that the managers of these hospitality companies significantly lacked substantive knowledge of emerging “market” management methods and concepts.

scholarly journals Design of Vegetable Pot Seedling Pick-up Mechanism with Planetary Gear Train

2020 ◽  
Vol 33 (1) ◽  
Author(s):  
Zhipeng Tong ◽  
Gaohong Yu ◽  
Xiong Zhao ◽  
Pengfei Liu ◽  
Bingliang Ye
Keyword(s):  
Design Method ◽  
Planetary Gear ◽  
Gear Train ◽  
Dimensional Synthesis ◽  
Planetary Gear Train ◽  
Key Points ◽  
Physical Prototype ◽  
Noncircular Gears ◽  
Pitch Curve ◽  
Parameter Values

Abstract It has been challenging to design seedling pick-up mechanism based on given key points and trajectories, because it involves dimensional synthesis and rod length optimization. In this paper, the dimensional synthesis of seedling pick-up mechanism with planetary gear train was studied based on the data of given key points and the trajectory of the endpoint of seedling pick-up mechanism. Given the positions and orientations requirements of the five key points, the study first conducted a dimensional synthesis of the linkage size and center of rotation. The next steps were to select a reasonable solution and optimize the data values based on the ideal seedling trajectory. The link motion was driven by the planetary gear train of the two-stage gear. Four pitch curves of noncircular gears were obtained by calculating and distributing the transmission ratio according to the data. For the pitch curve with two convex points, the tooth profile design method of incomplete noncircular gear was applied. The seedling pick-up mechanism was tested by a virtual prototype and a physical prototype designed with the obtained parameter values. The results were consistent with the theoretical design requirements, confirming that the mechanism meets the expected requirements for picking seedlings up. This paper presents a new design method of vegetable pot seedling pick-up mechanism for an automatic vegetable transplanter.

AN INDEPENDENT ACTIVE TORQUE BALANCER USING A SERVO-CONTROLLED DIFFERENTIAL GEAR TRAIN

2009 ◽  
Vol 33 (2) ◽  
pp. 329-348 ◽  
Author(s):  
Sun Jing ◽  
Yao Yan-An
Keyword(s):  
Control Function ◽  
Design Procedure ◽  
Point Of View ◽  
Gear Train ◽  
Optimization Approach ◽  
Integrated Method ◽  
Control Functions ◽  
Differential Gear ◽  
Novel Concept ◽  
Input Torque

This paper proposes a novel concept of active balancer for reducing the input torque fluctuations of mechanisms. A differential gear train is used in this active balancer and one of its two input shafts is driven and controlled by a servomotor. From the structural point of view, it is designed as an independent device that can be assembled and disassembled easily; from the functional point of view, it can minimize the torque fluctuations in a variety of working conditions. At first, an exact control function of the servomotor that can totally eliminate the input torque fluctuations of the mechanism is gained by an analytical method; in what follows, an optimization approach is developed to select appropriate control functions for the servomotor to balance the input torque of the working mechanism with consideration of the servomotor’s own input torque minimization; finally, an integrated method is presented for optimizing both the control function of the servomotor and the structure parameters of the differential gear train. Two numerical examples are given to illustrate the design procedure and to show its feasibility.

Kinematic Analysis and Design of Eccentric Rolling Transmission

2017 ◽  
Author(s):  
Stanislaw Pabiszczak ◽  
Adam Myszkowski ◽  
Roman Staniek ◽  
Lukasz Macyszyn
Keyword(s):  
Kinematic Analysis ◽  
Design Procedure ◽  
Gear Ratio ◽  
Output Shaft ◽  
Cad Model ◽  
The Novel ◽  
Rolling Bearings ◽  
Analysis And Design ◽  
Input Shaft ◽  
New Type

The paper shows an idea of a new type of mechanical gear — the eccentric rolling transmission. The main parts of that transmission are rolling bearings, mounted eccentrically on the input shaft which cooperate with the special-shaped cam wheels mounted on the output shaft. The number of rolling bearings is equal to the number of cam wheels. On the basis of kinematic analysis equations of the curve which describe a shape of cam wheels were determined for two different cases: in the first one the directions of shafts rotations were opposite, and in the second they were the same. Kinematic analysis of the novel transmission was carried out to determine maximum gear ratio depending on the adopted input parameters. As a result of analyses a design procedure of the eccentric rolling transmission and CAD model were prepared.

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