What are the basic parameters of an English gear?
1, according to your description, is the helical gear2 there is no royal system for gears
First of all, notice that the "pitch path" and the "diametral pitch" (called pitch) are two different concepts.Also note that the following is the "pitch diameter", which is sometimes the same as the "pitch diameter" (that is, the pitch diameter). Sometimes it is different (the same as the gear).The British gear "DP" and the metric gear "modulus" (m) are the different methods of characterizing the same feature (size) of the gear tooth profile, and their conversion formulas are as follows:DP*m = 25.4As you know, for general spur gears, the metric circle diameter of metric gear is d (Z):D = ZM (unit mm)Therefore, the diameter of the pitch circle of the straight gear is d:D = (25.4z) / DP (mm)But in English, the unit of measurement is in inches in, so the formula is:D = Z / DP (in)In addition, most of the British gear tooth top coefficient is 1, such as DP8 of the spur gear, its addendum is 1/8, or 3.175mm.It can be seen that the bigger the modulus m of metric gear, the bigger the tooth shape, and the larger the pitch DP of the English gear, the smaller the tooth shape.Note: the "metric" and "English" above are informal, commonly known as "DP" in many standards. They are represented by "P".
3 bevel gears are complex and involve many parametersThe modulus of the 4 helical gear is hardly integer5 to the library to borrow "bevel gear design manual" look at it, understand, too much content, too many symbols
