Design method of circular-free noncircular-noncircular three-wheel synchronous belt transmission
A technology of synchronous belt transmission and design method, which is applied in the direction of transmission, calculation, mechanical equipment, etc., and can solve the problems of inconvenient lubrication, inability to guarantee regular transmission ratio, low manufacturing cost, etc.
Active Publication Date: 2019-02-12
ZHEJIANG IND POLYTECHNIC COLLEGE
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Problems solved by technology
However, non-circular gear transmission is only suitable for non-uniform speed transmission occasions with small center distance and convenient lubrication, so non-circular flexible member (belt / chain) transmission suitable for large center distance, inconvenient lubrication and low manufacturing cost should be used born
Among them, the polygonal effect of non-circular chain transmission is obvious, so it is limited when there are strict requirements on the change law of non-uniform transmission ratio; at the same time, ordinary friction belt transmission cannot guarantee accurate transmission ratio law due to elastic sliding.
[0003] The current non-circular belt (chain) transmission has only 2 non-circular belt (chain) wheels - the driving wheel and the driven wheel. During the transmission process, because the pitch curve is non-circular, the slack of the belt (chain) is real-time. Therefore, it is impossible to guarantee the non-uniform transmission ratio change law and the real-time tension of the belt (chain) required by the work at the same time.
In practical application, in order to compensate the slack change of the belt (chain) in the transmission, the tension is realized by adding a spring, because the tension force changes in a movement cycle, and the tension force increases with the aggravation of the non-uniform velocity characteristic. The greater the range of change, this will in turn affect the accuracy of non-uniform speed transmission, and the dynamic characteristics will become worse; therefore, in actual engineering, non-circular belt (chain) transmission is rarely used in precise load high-speed transmission occasions
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[0062] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0063] The design method of circular-free noncircular-noncircular three-wheel synchronous belt drive, the specific steps are as follows:
[0064] Step 1. Given a circular active synchronous pulley pitch curve radius r = 30mm, three wheel center distance L1 = L 2 = L 3 =100mm, the three wheels are closed convex curves with equal perimeter, calculate the perimeter s=188.4956mm of the pitch curve of the circular active synchronous pulley according to the following formula:
[0065] s=2π×r (1)
[0066] Cutting radius p of pitch curve of circular active synchronous pulley 1 =r.
[0067] Step 2, calculating the pitch curve equation of the free non-circular driven synchronous pulley;
[0068] Determine the angle relationship between the circular active synchronous pulley and the free non-circular driven synchronous pulley:
[0069]
[0070] In the for...
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The invention discloses a design method for synchronous belt transmission of a circular wheel, a free non-circular wheel and a non-circular wheel. The design method disclosed by the invention comprises the following steps: establishing a pitch curve equation of a drive wheel and a driven wheel of the synchronous belt according to a given transmission ratio of the drive wheel and the driven wheel and by virtue of tangential polar coordinate theoretical calculation at first; and then calculating the perimeter of the synchronous belt, and obtaining a pitch curve of a non-circular tensioning synchronous belt wheel through an iterative algorithm and according to the slack quantity of the perimeter of the synchronous belt. According to the design method disclosed by the invention, a tensioning wheel is a non-circular synchronous belt wheel with a free pitch curve, and capable of compensating the slack variation quantity of the belt, which is generated during a transmission process of a circular drive synchronous belt wheel and a free non-circular driven synchronous belt wheel, in real time, and overcoming the problem that traditional two-wheel non-circular belt transmission cannot meet non-constant-speed transmission and real-time tensioning simultaneously. According to the design method disclosed by the invention, the pitch curve of the driven wheel is a free non-circular pitch curve, unconstrained by a specific curve form, flexible in design, and capable of meeting non-constant-speed transmission with more free transmission ratio change and a large centre distance.
Description
technical field [0001] The invention relates to a design method of a non-circular synchronous belt transmission, in particular to a design method of a circular-free non-circular-non-circular three-wheel synchronous belt transmission with variable slack self-compensation. Background technique [0002] The transmission mechanism changes the motion form and speed of the input and output components to meet the requirements of different working environments. Among them, the non-uniform transmission mechanism occupies a very important position, and the common ones are the connecting rod mechanism, the cam mechanism, and the non-circular gear mechanism. Compared with the connecting rod mechanism and the cam mechanism, the non-circular gear mechanism has the advantages of compact structure, stable transmission, large transmission power, and easy dynamic balance. Therefore, it has been successfully used in processing machine tools, automatic machinery, transportation, instrumentation,...
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IPC IPC(8): F16H7/02G06F17/50
CPCF16H7/02G06F30/17
Inventor 叶军陈建能
Owner ZHEJIANG IND POLYTECHNIC COLLEGE
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