Study On The Adjustable Two-output Impulse Generator And Its Design Of Self-adjustment

Innovative design is the basic way of improving the capability of products'self-exploitation. During the process of mechanical production designing, innovation in transmission and execution system is core of mechanical motion system design. Therefore, mechanism innovative design is the eternal subject of mechanism research. Actually, the development of science and technology puts forward a more advanced demand on the structural, kinematics and dynamic performance of the mechanical products, which urges people do more thorough and systematical research in order to recognize and discover its potential for the innovative design and application. The planar linkage mechanism is one of the most widely used mechanisms, which is not only the most simple but the most complicated, and there are much theories and methods to analyse and design this kind of mechanism. Planar linkage mechanism is the kind of traditional mechanism that people have done deep research on it and mature in its application. Practically, development of technology and manufacture makes it be adequately recognized with its shortage overcome and benefit utilized, so it can meet the higher requirement.Thus, the further cognition, research and application to the linkage mechanism still has a bright future and it is also an important research aspect.The mechanical continously variable transmission, with its unique advantage, from last 1960s, has always been paid close attention and was considered as a potential variable transmission with great future. The most important method of the innovative application to the structure and kinematical property of the linkage mechanism is the transmission form impulse mechanism to linkage mechanism. Not only fully utilized the advantage of the linkage mechanism, but uncovered the disadvantage of the linkage mechanism at the same time along with the higher request on the performance of the variable transmission. The main design requirement: (1) High transmission efficiency. (2) Adjustable infinite rotational speed output, outstanding speed regulation performance and minimum output functional characteristic variation. (3) Excellent dynamic characteristic and stability; (4) Multiple output but simple structure. It transcends the limit of normal linkage mechanism and needs further exploration,research and exploitation on a new way.This paper is exactly based on these needs and aimed at the specific requirement of high-performance and high-power variable pulse transmission and pulse generator. Planar linkage mechanism was thoroughly studied and double out-put function generator was exploited further to applied field of the linkage mechanism. Also, this thesis systematically studied its synthesizing theory and method of the structure, kinematics and dynamics.The main task:①A novel main transmission mechanism (impulse generation mechanism) of continously variable transmission was constructed—the full hinge coaxial out-put binary link function generator. Then the possible schemes of six-bar mechanism working as impulse generation mechanism was discussed based on the structural synthesizing theory according to the specific working requirement to the continously variable transmission. And a basic macroscopically judgment method for the characteristic of the linkage mechanism was proposed. Furthermore, a full hinge coaxial six-bar function generation mechanism (model Stephenson) as the new impulse generation mechanism was selected according to the objective of high efficiency, extremely stablity and simple structure. The most important, the novel mechanism can completely remede those shortages, which makes the current pulse infinite transmitting require a complex structure of many parallel.②For the convenience in analysis and designing, the concept of regarding the five-bar circuit of the mechanism as the equivalent four-bar mechanism of variable lenth in coupler was proposed according to the structural and characteristic of coaxial out-put binary link function generator (model Stephenson). Therefore, the six-bar double out-put function generation mechanism can be analyzed and studied as two sets of four-bar mechanism which have the same crank (basic and equivalent four-bar mechanism ).Then the parametric model of the coaxial double out-put function generator was constructed by using the ADMAS simulation software.The specific structure of the double out-put function generator was discussed in detail, which motion character, force transmitting character and laws are equal to those of six-bar mechanism's two out-put rockers with the positive and reverse installation modes of crank rocker mechanism. Furthermore, the basic motion character, laws and main influence factor of the five-bar circuit coaxial double rocker mechanism was analyzed (i.e. four-bar mechansim with variable length in link). And then the dynamics and kinematics character of basic4-6-bar mechanism was understanded thoroughly and systematically. The results provide a fundamental theory for the design and application of the double out-put function generation mechanism. ③Base on the purpose of improving the dynamical performance, enhancing the stability of the out-put and specific motion requirement of the six-bar double out-put function generator working as the impulse variable generation mechanism, the scheme of separate-synthetic was proposed. By using the combinative way of geometry diagram and analysis, a model of synthetic solution was constructed, which aim at the specific requirement of opposite instantaneous transmission ratio and two bit-parametric of the four-bar mechanism in order to build the synthetical-holistic model so as to solve the dimension parameters of five-bar loop (equivalent four-bar mechanism) with the similar motion laws to the basic four-bar mechanism. This scheme solved the problem of higher order of motion parameter and provided a reliable theory basis and original solution for the optimal synthesis of all parameter.④To optimize the movement of the double out-put function generation mechanism and kinematical performance to get the optimal solution (especially the five-border loop which has more variable parameter), the displacement matrix method was adopted to build the full-parameterized synthetic function. A request of the modified equivalent four-bar mechanism and gained the whole solution of mechanism was proposed by using Homotopy Continuation methods, and finally obtained the optimal solution which reached the anticipative target of comprehensive control.⑤To improve the stabilization, mechanical efficiency and lifespan of this multiple loop, multiple out-put and cycle structural system and reduce the manufacturing costs, the coaxial six-bar double out-put function generation mechanism (Stephenson model) has been innovatively designed on self-adjusting method. After the intensive analysis of over constraints,"basic link groups without overconstraint"planar linkage self-adjusting design method was proposed. Furthermore, the methods and principles of multiply-loop system were summarized thoroughly and systematically, especially including the design of self–adjusting structure with non-binary link as its middle component (link) and rationable displacement of working pair.⑥A novel overrunning clutch with wedge leveled assistant-ring was developed, which components are usually discoid, easy to remain balance and relatively sensitive with small dynamic load and face contact. Therefore, it has a stronger carrying capability and lifespan. Based on the analysis of the mechanism's principles, the condition about wedge-in and wedge-out was discussed thoroughly, and the structure design was carried out in detail. Then the machine was manufactured and tested with good properties. This research achievement not only provided an innovative way of exploiting the Pulse variable Transmission, and pointed out a new direction for the new requirements to the Planar Linkage Mechanism which made it to reach its limit. It is of great academic significance and applicable value.