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The selection of the universal reducer
Source: China Bearing Network Time: 2018-03-26
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The selection of the universal reducer includes the process of proposing the original condition, the selection type, and the determination specification. In contrast, the type selection is relatively simple; and the condition of the gear unit is precisely supplied; the characteristics of the description, production and application of the reducer are The universal reducer correctly and rationally selects the key points of the specification.
Standard selection should be satisfactory for the strength, thermal balance, and the radial extension of the shaft extension.
1. Select specifications by mechanical power or torque (strength check)
The biggest difference between the general reducer and the special reducer is that the former is suitable for each occupation; but the deceleration can only be depicted according to a specific working condition; therefore, the user needs to think differently according to their respective needs. Correction coefficient; the factory should use the motor power (not the rated power of the reducer) in practice, and the latter should be labeled according to the user's special conditions; the coefficient of thinking; usually considered when drawing; only the power should be used satisfactorily. Less than or equal to the rated power of the reducer; the method is relatively simple.
The rated power of the universal reducer is usually according to the operating (working condition) coefficient KA=1 (motor or steam turbine is the prime mover; the load of the working machine is stable; 3~10h per day; ≤5 times per hour; the starting torque is 2 times the working torque); the touch strength safety factor SH≈1, the failure probability of a single pair of gears ≈1%, and other conditional accounting.
The rated power of the selected reducer should be satisfactory
PC=P2KAKSKR≤PN
Where PC calculates power (KW),
The rated power ( KW ) of the PN reducer,
P2 work machine power (KW),
KA application coefficient; think about the impact of working conditions,
KS launch coefficient; think about the impact of the number of launches,
KR reliability factor; think different security requirements.
The application coefficients used in countries all over the world are basically the same. Although many samples do not reflect the two coefficients of KS KR, they are due to the intersection (clear demand for their own working conditions), knowing each other (the functional features of the reducer are clear); The type usually has a large amount of good amount; the equivalent of thinking about the influence of KR KS.
Because the application is different, the degree of importance is different, the loss of personal safety and production is not the same, and the repair is difficult; the demand for the reliability of the reducer is also different. The coefficient KR is required for practice. The degree of reliability corrects the reliability of the original depiction. It fits the rules of ISO6336, GB3480 and AGMA2001 B88 (American Gear Manufacturers Association specification) for the calculation of gear strength. At present, some domestic users are not sure about the reliability of the reducer. The specific amount of demand; can be drawn according to the usual special reducer drawing rules (SH ≥ 1.25; failure probability ≤ 1 / 1000); more important occasions take KR = 1. 252 = 1. 56 or so.
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Previous:The National Development and Reform Commission agreed to the six bearing specifications. The following is a note on the use and selection of bearings.
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