Study on Numerical Comparison Method of Four-bar Straight-line Guidance Mechanism

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In order to solve four-bar straight-line guidance mechanism synthesis problem for the arbitrarily given straight-line＇s ＂angle requirement＂ and ＂point-position requirement＂, a numerical comparison synthesis method for single and double straight-line guidance mechanism is presented, which is convenient to realize by computer program. The basic idea of this method is： to select a four-bar linkage whose relative bar length of crank is 1 as a basic four-bar linkage. Then the other three relative bars＇ length is changed, and a lot of basic four-bar linkage can be obtained. There are many single and double ball-points of each basic four-bar linkage. With the motion of a basic four-bar linkage, there is straight-line segment of each Ball-point＇ s path. The data of these basic four-bar linkages is saved to a database. When designing a four-bar straight-line guidance mechanism, the design data is compared with the data in database and a satisfactory four-bar linkage can be obtained. The method effectively solves the straight-line guidance mechanism synthesis problem.