| According to the need of practical engineering, this project is to design a set of eccentric lever with bevel gear of a set of servo mechanism,implemented by the motor to rotate as the input end, output end along the line moves up and down movement. Swing angle of plus or minus20degrees, resistance moment output can bear Nm. Asked Sifu institution overall length and width, size of not more than200mm,90mm,80mm,requires agencies can within the prescribed conditions of use high efficiency and stable operation does not occur resonance.According to the engineering requirement, composition and transmission scheme of applying mechanical principle and mechanical design theory to design the PW mechanism. The PW mechanism design by bevel gear as input, via a bevel gear planetary rotation and revolution, connected by an eccentric lever, an eccentric lever output around a support point to complete the rotation and swing up and down in a straight line. By the power0.75KW, speed of910r/min AC motor as a power input, there duction ratio of reducer12/1is connected with the eccentric lever bevel gear PW mechanism.Through the design and the calculus of several agencies, the research roup selected bevel gear and the eccentric lever combined to establish mechanical PW mechanism, calculation of eccentric lever bevel gear PW mechanism freedom in determining the motion transmission mode and transmission mechanism. Through calculation, the output end of the PW mechanism for1degrees of freedom, meets the design objective. The design requirements of comprehensive transmission mechanism, for the convenience of manufacturing process and structure assembly, determine the PW mechanism casing by a rectangular cuboid shape, divided into left,right, in the three section assembly. According to the Handbook of mechanical design to calculate the bevel gear, planetary gear, an eccentric lever and other parts size, and to determine the size of each component assembly. In determining the size of parts and assembly, the application of Solidworks software to establish the three-dimensional model of each part and complete the assembly eccentric lever bevel gear PW mechanism.Will build good eccentric lever bevel gear PW mechanism assembly model into the finite element analysis software Workbench on the main rotating parts for no-load should analyze the modal force analysis and casing. The output end of the eccentric lever load, stress analysis. Analysis showed that the eccentric rod output mainly for the upper and lower line swing, existing in the movement process of the inertial motion of stress distribution on the lever, input and output terminals of the upper and lower sides, the maximum value was0.024MPa. Little impact on the eccentric lever strength. Through the modal analysis, the casing of first-order natural frequency is1715HZ,with the power0.75KW, speed of910r/min AC motor and reduction ratio for the reducer of12/1as a power input, the input speed is75r/min,resonance will not occur, an eccentric lever bevel gear PW mechanism capable of stable running.According to the design scheme of PW mechanism and parts size calculation, prepare two sets of bevel gear eccentric lever PW mechanism prototype of no-load test,1hours of work in accordance with the conditions of the experiment project requirements. The use of power0.75KW, speed of910r/min AC motor via a reduction ratio of the speed reducer is connected with a bevel gear eccentric lever PW12/1mechanism. Under the drive of the motor, private institutions operate freely, vibration and noise are very small, eccentric lever on the output end, swinging up and down37.5r/min,swing error can be controlled within1.0mm, swing track linear deviation does not exceed2%. Planetary gear train starting torque was measured to be0.4N.m, in the small starting torque can start running smoothly. Verification of the PW mechanism is stable and reliable, consistent with the expected. |
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