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Dissertations / Theses on the topic 'Sprocket'
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1
Haluška, Ladislav. "Návrh technologie výroby součásti "Řetězové kolo"." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229305.
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The main aim of this thesis is proposing of acceptable technology with manufacture for a part of chain sprocket of the material 11 500, which is designated for a small light motorcycle with a cubature at most 50 cm. It is the prototype, now. The work is specialized on a technology of precision cutting with a pressure edge, at first. This is use for a technology. The component of this work is needed the literary study, calculating and drawing documentation and technical – economic valuation. Et the end of this work, you can see all attachments and all sources, which I used for this work.
2
Klár, Pavel. "Návrh dopravníku na rychlospojky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230089.
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This thesis is focused on the design of conveyor of couplers with regard to the requirements for the resolution, and consisting of several parts. The first part outlines the given issue, short research study and an idea of solution. The next part concentrates on the structural design of the whole conveyor. Then the description of the first part of the conveyor including the structural design and the required calculations follow. Finally, other conveyor parts, the budget and the instruction manual are explained. The thesis includes the related drawings and all necessary calculations for other conveyors parts as well.
3
Šarman, Michal. "Návrh nákladního výtahu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-231000.
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The aim of this thesis is to design a service lift according to given parameters, which is actuated by a special mechanism featuring a thrust chain. The opening of the thesis presents basic categorization of lifts. Following chapters are dealing with the design of the lift itself, including selection of components and functional calculation according to ČSN EN 81-1. The final part contains technical comparison with hydraulic lifts. Relevant technical drawings are also part of the thesis.
4
Odvárka, Tomáš. "Návrh nákladního výtahu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228407.
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This diploma thesis deal with project of servis lift drive by special mechanism using thrust chain. There are designed and descrobed the most importana construction unit of servis lift in the this thesis. The calculation as tha static for the main part sof the lift are included in the constructional analysis. The most attention is pay to drive, which is consist of eletric motor, clech, gearbox, break and imposition of sprocket wheel.
5
Drápela, Josef. "Návrh nákladního výtahu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228051.
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This diploma thesis deal with project of service lift. The service lift is drive by special mechanism using thrust chain. The chain is led from chain accumulator over sprocket gear to vertical guiding groove. Lift car is connected to the end of chain. There are designed and described the most important constructional unit of service lift in this thesis. But the most attention is pay to drive, including break system and chain accumulator. The drive is consist of electric motor, clutch, break, planetary gearbox and sprocket gear.
6
DeCaires, Brian J. "Variation analysis of involute spline tooth contact /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1176.pdf.
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Cheng, Sheng-Yuan, and 鄭盛遠. "Design of Non-Circular Sprocket for Bicycles." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/q5ccsm.
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碩士<br>國立虎尾科技大學<br>動力機械工程系機械與機電工程碩士班<br>105<br>Recently, health issues is getting more attentions than ever. It makes the requirement of the sports equipment with higher performance and good characteristics. As the times change, the structure is optimized for bicycle, and sprocket is one of them.
This study applys Visual Studio C++ to design and automatically draw non-circular sprocket. The eccentricity of the elliptical sprocket and JIS tooth profiles are compare with the effectiveness.
A circular sprocket and elliptical sprockets of eccentricity, 0.2, 0.4, 0.6 respectively, with tooth profile, type S and type U, are manufactured for the experiments.
The result reveals that the elliptical sprocket with 0.4 eccentricity is the best one.
The results also show that JIS-U profile is better than S-type. The torque trajectory is obtained from the experiment and fitted with Matlab to get the best pitch curve of sprocket.
8
CHUN-TSUN, KUO, and 郭俊村. "On the analysis of bicycle sprocket tooth profile." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/33224124395570991751.
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碩士<br>逢甲大學<br>機械與電腦輔助工程學系<br>102<br>Chain and sprocket are extensively used in bicycle transmission system. Chain and sprocket transmission is recognized not so precise as gear transmission. Unlike gears have standard involute profile, the sprocket doesn&;#39;t have a standard profile. Commercial sprocket profiles are usually constructed by two or three segments of curves or a small segment of straight line included. Those sprocket profiles design may find in engineering handbooks. There are few researches on the chain and sprocket transmitting efficiency analysis. This research adopts chain roller envelop as sprocket profile. Using of chain roller envelop as sprocket profile make the profile tangent to the roller through whole contact journey. This would cause more smooth contact and should improve the efficiency of transmission.
The sprocket profile from enveloping a chain roller is employed to develop a computer solid model of sprocket. The sprocket computer model is then imported into dynamic analysis software ADAMS® and integrated with a segment of chain model to analyze the dynamics of chain and sprocket transmission. The results show that the sprocket designed by this research may considerably reduce the contact force between sprocket and roller compared with commercial sprocket. Small contact force should reduce the friction and improve the transmitting efficiency.
9
WANG, CHUAN-CHENG, and 王傳承. "Optimum design for sprocket shape of the freewheel on bicycles." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/30957163264403906540.
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Hsu, Pai-Hsiang, and 徐百祥. "OPTIMUM DESIGN FOR SPROCKET TOOTH PROFILE OF THE FREEWHEEL ON BICYCLES." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/53124902839020441583.
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Lin, Shu-Ting, and 林淑婷. "The Design of Chain Link and Sprocket of Inverted Tooth Chain." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/37206552873534591277.
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碩士<br>國立中興大學<br>機械工程學系<br>92<br>General speaking, we usually adopt inverted tooth chain to transmit power under high speed and loads. Inverted tooth chain transmits power through the positive engagement of link teeth with sprocket teeth. It can reduce contact force and noise by means of progressive engagement, and improve chordal action of the sprocket-chain transmission mechanism. The design knowledge of inverted tooth chain mechanism has not been totally understood in our country. So it is necessary to develop the design methodology for the inverted tooth chain mechanism.
The design process of inverted tooth chain mechanism and the design parameters for the shapes of chain link tooth and sprocket tooth has been developed in this thesis by studying the relationship between the shapes of chain link tooth and sprocket tooth of the inverted tooth chain listed in the American National Standards Institute. The computer-aided engineering technology has been used to build and simulate the dynamic meshing process of different inverted tooth chains and sprockets to analyze the effect of contact force, interference, and chordal action.
12
Yu, Tien-Huang, and 余典桓. "The Design of a Generalized Spirograph Linkage with Non-Circular Sprocket." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/6y73xq.
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碩士<br>國立中山大學<br>機械與機電工程學系研究所<br>96<br>A three-link, single-degree-of-freedom mechanism, named the Spirograph linkage, is investigated in this thesis. What is special about this open-chain mechanism is that, by the use of a chain and two sprockets and therefore maintaining a constant angular velocity ratio between the two rotating links, the path traced by this mechanism can be shown to be either an epitrochoid or a hypotrochoid. Through the understanding of the formulations of the trochoids, the relations between the design parameters of the Spirograph linkage and the corresponding path patterns are derived.
With certain design parameter combinations, the Spirograph linkage is able to feature paths with cusps, which means dwells and are useful in applications. A design chart for such cusp-generating Spirograph linkages is then included in the thesis for the sake of convenience.
In addition, by matching the link-length ratio with the angular velocity ratio, ways for finding closed single-loop paths of the Spirograph linkage are also studied. As for the path generation problems concerning only a fraction of the entire path, we compare results given by the classical precision point scheme with assorted combinations of initial conditions.
In the latter part of the thesis, non-circular sprockets are also introduced to provide the Spirograph linkage additional freedom to cope with the demand of more flexible, i.e., non-symmetrical shapes of the path. However, many constraints are to be imposed on the design process of such linkages, and these design limitations are elaborated in the thesis. At last, the use of Newton’s method, the selection of the proper type of trochoids, the application of the envelop method for obtaining the profile of the non-circular sprocket, the analyses of angular velocity ratios, etc. are all exemplified in the several numerical examples of the thesis.
13
You, Ci-Syong, and 尤麒熊. "Integration of QFD,TRIZ and Taguchi method to develop disruptive innovation in bicycel sprocket process design." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/80540931975163060395.
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碩士<br>國立彰化師範大學<br>工業教育與技術學系<br>99<br>Today's thriving bicycle industry, Taiwan's market is mainly locked in the high price of production and development of various parts of bicycle, so this study employs the disruptive innovation theory point of view explore above issue studies:
The use of disruptive innovation theory is to identify the current market, bicycle sprocket asymmetric motivation. QFD in product development combined with able concept, the concept selection process to establish a pattern. In the QFD analysis from the theory of disruptive innovation has been the customer demand side by scenario analysis, obtained by the analysis of patent quality characteristics. The research model in term of how to develop product design and develop the planning process is signed to properly integrate customer needs. School mold into technical vocational technical creativity of design and manufacturing concept, developed with the TRIZ theory is integrated into the contradiction between QFD quality characteristics. We firstly use finite element method simulation and analysis of the Taguchi method to optimize the results, then employ the genetic algorithm neural network to predict the best value. Finally the best parameters to experiment can be determined.
Experimental results manufactured product prices of this study are far below market price. Therefore, the mold can be applied to mass production to enter the market, but also justify the utilization of disruptive innovation theory. The cheaper, simpler, and more convenient bicycle Chan wheel can be feasible.
14
Lin, Shyh-Ming, and 林勢敏. "An integrated freewheel sprocket design with downshiftng and upshifting motions of a bicycle''s rear derailleur system." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/72965552503483296951.
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碩士<br>國立清華大學<br>動力機械學系<br>83<br>The shifting motions of rear derailleur system of a bicycle are
classified as downshift and upshift. Downshift means that the
chain of a bicycle is shifted from a smaller sprocket to a
larger one, on the other hand, upshift motion is on the
contrary to downshift. To design a multi-speed freewheel
integrating these two motions is difficult because of the
conflicts as both shifting motions are considered. This thesis
begins with the analysis of the rear derailleur system of a
bicycle. By applying the concept of the nonlinear shifting
path, a reasonable shifting motion was obtained. In addition, a
comprehensive shifting model and the methodology for designing
the rear derailleur system was thus established. A computer-
aided design and manufacturing software was also developed
based on the proposed design methodology. Three sets of
prototypes of the freewheels were manufactured and tested. The
accuracy of the proposed model was evaluated from the
experimental results. It clearly illustrates that the developed
model and CAD/CAM software are very useful for designing a new
rear derailleur system of a bicycle.
15
LIN, GENG-WEN, and 林耿文. "Design and Experimental Analysis of Bicycle with Non-circular Sprocket Considering the Left and Right Foot Torque Differences." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/s5a8r6.
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碩士<br>國立虎尾科技大學<br>動力機械工程系機械與機電工程碩士班<br>107<br>In today's global warming issue, the concept of promoting energy conservation and carbon reduction has been valued by the public,
which has led more people to choose to ride bicycles instead of the original carbon-discharging vehicles,
not only to meet the purpose of environmental protection, but also to achieve the effect of sports.
The bicycle sprocket commonly used in the market applies the round sprocket which has the problem of dead point. Conversely,
the non-circular sprocket has the advantage of quickly passing the dead point and reducing the muscle utilization rate to achieve labor-saving effect.
In order to improve the riding efficiency of bicycles, it is of potential market value to explore and study non-circular sprocket.
Because the pedaling force of human’s left and right feet is different, and the pedaling force is different at each angle,
in order to obtain the better riding efficiency,
this study proposes the special non-circular sprocket designs to improve the uneven force of the left and right feet.
Then, the computer aided program is developed for the non-circular sprocket,
and the corresponding non-circular sprocket can be obtained according to the required parameter conditions and the pitch curve can be divided into integral multiples of the chain pitch.
The study investigates the non-circular sprocket and the traditional circular sprocket for experimental analysis,
and with the digital image to measure the pedal angle in the riding to get the pedaling force.
The force of each joint is calculated by the pedaling force and the balance equation of the simulated five-bar linkage mechanism,
and then the advantages and disadvantages of different sprocket wheels are analyzed. In this study,
the best non-circular sprocket in this experimental design was found by measuring the efficiency, torque, rotational speed,
and joint force through experiments of multiple subjects.
16
Wang, Chuan-Chen, and 王傳承. "ON A STUDY OF BICYCLE SPROCKETS DESIGN." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/39090435728019556019.
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博士<br>國立交通大學<br>機械工程系<br>87<br>The overwhelming majority of bicycles are equipped with sophisticatedderailleur systems that serve the same purpose as transmissions in motor vehicles: enabling more efficient use of input power through selection of suitable gear reduction ratios. This thesis presents two design methods for improving the performance of bicycle derailleur systems by modifying sprocket shape to eliminate jerkiness, slippage and rattling
noise, and guide chain movement from one gear to another more quickly and directly.
In the first method, a systematic design procedure is proposed to generate the chain-guided portion on the side of larger sprocket to improve the down-shifting performance. However, the method needs large quantities of computer time in three-dimensional simulation and optimization process. Moreover, the chain-guided portions increase manufacturing difficulty because of their complex pressing surface. The second method, a modified method of the first one, generates chain-guided portions more efficiency. In the new model a modified shape is selected to replace the original chain-guided
portion, i.e., a unique shape of chain-guided portion is generated by geometric topology with concept of design for manufacture (DFM). It decreases the design time and manufacture difficulty of bicycle sprockets. Benefits of shifting with the optimized sprocket shapes include improved
efficiency and smoother, more accurate shifting. Moreover, chamfers of sprocket-tooth tips and auxiliary disengagement design are discussed too.
According to this study, two prototypes of eight-speed and one prototype of nine-speed freewheels are manufactured and tested to compare with three types of eight-speed and one type of nine-speed freewheels products.
17
Ma, Ying-Zhi, and 馬應智. "System Design and Probability Analysis for Up-Shifting of Bicycle Front Sprockets." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/25039022841366367033.
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博士<br>國立中興大學<br>機械工程學系所<br>105<br>The relative spatial position of each chain link and the phase angle of engaged tooth are not concerned in traditional sprocket designs for bicycle. As such, the chain shifting might fail regularly. In this study, an optimized path of one chain for up-shifting is derived. Such path is formed by several bended chain links sustain yaw and roll. Empirically, appropriate bending, yaw and torsion angles for tooth chamfer, could be shorten the up-shifting distance and phase angle required, eventually facilitate not only more ascending points compactly arranged on sprocket but larger chain laterodeviation which curtails sprockets clearance and integrates the sprocket unit. Then again, the optimized shifting path promotes efficiency and decreases required movement yielded by derailleur tappet pressure.
In addition, some factors such as force applied, force direction, and geometric configuration of a derailleur, which drew scant attention in design of a conventional sprocket. Generally, short yaw of chain link and scarcity of derailleur force induce the chain to straddle on a target sprocket, even make engaged links drop to original one. Thus, gear shifting would be failure. In fact, the proper force applied and direction will contribute to mitigate lateral forces and tensile forces applied on chain links, accelerate the process of chain shifts, extend the service life of chain and sprockets, and reduce vibrations or noises in the process of gear shifting, even improve the efficiency of chain shifts. The purpose of the geometric design for derailleur is to derive an optimal profile that the minimum force applied on. Base on above, all contact points in the optimal trajectory are not linear arrangement between derailleur and chain. In this paper, the optimal geometric configuration of derailleur is formed by employing difference theory of quazi-dynamic equilibrium for transmission chain as the optimal path is derived.
However, in the course of up-shifting, unstable swing of bicycle chain is usually caused by derailleur. Moreover, the failure of gear shifting is also arouse by poor match of derailleur with tooth chamfer or phase angle of sprocket. As such, many researchers have devotes themselves on how to cut proper tooth chamfer or various optimized paths for up-shifting of bike chain. However, a perfect tooth chamfer given with an optimized path could not guarantee the success of any gear shifting more, yet. Therefore, this paper employs Lami’s theorem and forces equilibrium for each chain link to propose a probability analysis of positioning for bicycle chain caused by derailleur force and chordal action in the course of gear shifting. Such data could offer a criterion of efficiency evaluation for derailleur system and provide a reference for engineering design also.
18
Lin, Ming-De, and 林明德. "The Design and Analysis of Chains and Sprocrets." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/7vcd4t.
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碩士<br>國立虎尾科技大學<br>機械與電腦輔助工程系碩士班<br>101<br>This paper mainly after bike flywheel drive to do the design and presents the complete drive system with new double-chain-type mechanism proposed in the design, the parts drawn through SolidWorks and combinations, then use SolidWorks plug-in software for dynamic simulation of this mechanism and structural analysis, the above dynamic simulation and structural analysis of the results made export charts to explore, from the text can be learned in the flywheel design, based on the internal structure reversed to better combination, as with the role of force in the same direction, did not come from inside resistance force of a flywheel of the group and therefore higher strength; give different transmission speed, the flywheel size for comparison, dynamic simulation, we found that the higher the speed of its movement relative to the low-speed smooth curves are many, the use of chain transfer of power in the high-speed the situation will be stabilized, the chain link itself between the plate and the chain stay with clearance, mainly to allow the chain to take advantage of this shift chain clearance speed up and down chain, but this mode will cause the chain of stress additional burden; paper concludes with improvement of traditional gear shift chain, the shortcomings of the traditional style make improvements, combined with the new theory highlights the improved transmission mechanism is the possibility of its development.
19
Li, Bo-Wei, and 李柏緯. "Design and Riding Performance Analysis of Elliptical-Eccentric Sprockets Chain System for Bicycles." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/08494551427498059912.
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碩士<br>國立臺灣大學<br>機械工程學研究所<br>101<br>The use of elliptical front sprocket can enhance the riding performance of cyclists, but would cause chain slack during operating, or lead to chain drop. The purpose of this study is to analyze the improvement of chain slack and the enhancement of riding benefits by using elliptical front sprocket combined with eccentric sprocket for bicycles. First, the geometry mathematical model of elliptical-eccentric sprockets system and the kinematic model and the dynamic model of the leg simulation planar five-bar linkage have been established. Then, with the computer program which is developed to analyze the eccentric of sprocket, the best design parameters for different major-minor axis ratio can be found, and achieve the target of minimum chain slack. And then, with the data of cadence variation and the different crank install angle, the joint moment and joint power can also be simulated by using computer programs. Finally, according to the data of joint moment and joint power, three groups of design parameters have been raised to reduce the joint loading and enhance the pedaling efficiency. The enhancement of riding benefits compared to the traditional system would be investigated. This study could be applied in practice and promote the design and research on the non-circular sprockets for bicycles.