| The computer aided design procedure and relative software development about double-speed winch will be mainly described in this paper.The winch on automobi le crane is a transmission mechanism in mini and medium size provided with great transmission ratio in low speed range. As a result of being convenient for locating it in hoist roller,its reducer must satisfy request of light and compact structure. Ordinary gear transmission is hard to do so,the suitably multistage spur gear transmission that adopts 2K-H and NGW model planetary machine should be considered and in order to make machine further miniaturization,the closed planetary gear train should be adopted. In addition for raising rise-and-fall-speed of goods when crane is in empty load and light load situation we need a improved double-speed-type transmission based on the original single-speed winch. Using the differential planetary gear train that can do movement synthesis precisely can achieve this goal. Therefore if the closed planetary gear train and the differential plahetary gear train set up a multistage mixed gear train,we will obtain a winch on automobile crane which satisfy the request of double speed,great transmission ratio and small volume. Then through reasonable planetary transmission design based on mechanism analysis,machine design optimization and Finite Element method,smaller volume structure will be obtained,which produces remarkable economic benefit because of the reducing of machining material and wasted time. Due to full-scale application of planetary transmission,machine efficiency is higher than ordinary gear transmission. So such double-speed winch will certainly be widely applied to shipping,port,building and so on.Now,under the Microsoft MFC work frame using the object oriented high-grade programming language C++ to develop the Windows-based software has already been very popular,and this technology is being developed continuously. Developing the computer aided design procedure software of double-speed winch under such frame,we willeasy to get a set of software which is wieldy,extensible,being convenient for migrating and maintaining,it make entire software development more practical.Prime study content in the paper are described in the following. (1) Comparing solutions to the double-speed planetary winch design after the status quo on development of winch gear transmission is summarized,(2) Design optimization for multistage gear transmission of double-speed planetary winch,(3) Software development about double-speed winch design system,(4) Analyzing planetary gear transmission in full gear with Finite Element method in software I-DEAS,(5) Experiment on double-speed planetary gear transmission and Relative study . |
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