One of the basic requirements for the safety factor of a gear reducer is to make the gears have sufficient load-bearing capacity.Recently, although there are recognized (standard) calculation methods for the load-carrying capacity of the tooth surface, tooth root and gluing, there are many factors (commonly used coefficients or parameters) that affect the load-carrying capacity of gears, and some influencing factors are contradictory and mutually inconsistent. Therefore, for a general engineer who is initially involved in gear design, it may be difficult to complete the gear transmission design satisfactorily.newgear
In IS06336:1996, it is clearly pointed out in the calculation method of the bearing capacity of involute cylindrical spur gears and helical gears: ISO6336 is not used to guarantee the performance of the installed gear device, nor can it be used by general engineers, but for experienced provided by the gear designer.These designers can reasonably select the coefficient values in the formula based on similar design experience, and clearly understand the influence of these coefficients on the gear.In the United States ANSUAGMA2101-c95 'Basic Calculation Method of Involute Cylindrical Spur Gear and Helical Gear Strength and Determination of Main Coefficients', there are similar explanations.At the same time, it is pointed out that the knowledge and judgment required to calculate the different coefficients come from the accumulation of years of experience in design, processing and operation of gear units.For inexperienced gear designers, quantitative data will be helpful for analyzing and determining various influencing factors.The magnitude of various factors that affect the tooth surface (pitting) bearing capacity (torque, enduring strength).
In the calculation of the bearing capacity of the planetary reducer device, it is very important to choose an appropriate safety factor, because an excessively large safety factor will increase the overall size and weight of the transmission, and increase the manufacturing cost; Unexpected failure and danger.An appropriate safety factor should be at a reasonable manufacturing cost; enabling the device to meet the given reliability requirements.
When selecting the safety factor, the gear transmission should also be considered in the entire equipment. For example, in a rolling mill, there are motors, couplings, gear transmissions, racks and rolls, etc. The safety factors of each link must be Only by coordinating with each other can the production capacity of the rolling mill be fully utilized.The main basis for estimating the gear transmission safety factor is as follows. 1. The expected discreteness of machining accuracy and material quality of all structural elements in the gearbox. 2. The consequences caused by gear damage and failure, such as the consequences caused by the bending and breaking of gear teeth, are generally more serious than those caused by tooth surface fatigue (pitting corrosion), especially in occasions with personal safety, such as cranes and elevators. 3. Reliability of data concerning assembly, installation and service conditions. 4. The reliability of the calculation method.
