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Machine Tool Gear Structure Oct 23, 2019

Machine tool gear structure

The main parameters of machine tool gear (including cylindrical gear and bevel gear), such as the number of teeth, modulus, tooth width, tooth height, spiral Angle, graduated circle diameter, etc., are confirmed through strength calculation, and the structural design is the first to confirm the spoke, hub way and scale.


In gear structure design, machining, installation, strength, reuse and other design principles should be considered. By changing the shape and size of wheel spokes and hub, the desired gear structure can be designed. The diameter of gear is the main factor that affects the shape and size of spokes and hub. In general, according to the diameter of the gear determine the appropriate structure form, and consider other factors to improve the structure. For detailed scale values for detailed structures, see the relevant manual.


There are four basic ways of dividend distribution in gear structure:


1 gear shaft


For gears with small diameter, the distance from the bottom of the keyway to the tooth root is less than 2.5, and the bevel gear is less than 1.6 meters. It is worth noting that although the installation of the gear shaft is simplified, the overall length of the gear shaft is larger, which brings inconvenience to the installation. Gear machining. In addition, after gear damage, the shaft will be scrapped, not conducive to reuse. Gears and shafts should be made separately. Therefore, when (cylindrical gear) x>2.5 or (bevel gear) xm>1.6, there may be insufficient strength, easy to crack. At this point, the gear and shaft should be one. The gear and shaft have the same data, called the gear shaft.


Two solid gears


When the spoke width and tooth width are usually solid gear structure, its structure is simple and easy to manufacture.


Applicable conditions:


(1) the diameter of the top circle is less than 200 mm;


(2) special requirements for reliability;


(3) high-speed noise reduction.


In order to facilitate installation and reduce the convergence of the edge stress, the bevel should be cut at the edge of the hole and the top edge of the tooth. For bevel gears, the hub width should be larger than the tooth width to facilitate the processing of fashionable jig.


Web gear


When the top circle is between 200 and 500 mm in diameter, a mesh structure can be made to save data and weight. To allow for clamping and handling during processing, usually 4 to 6 holes are cut symmetrically on the web. When the diameter is small, forging method is usually used to obtain the forging data of drum gear blank. Small batch adopts free forging, large batch adopts die forging. When the diameter is large or the structure is disordered, the blank is usually cast with cast iron, cast steel and other materials. For die forging and casting gears, the necessary drawing inclination and large transition roundness >200-500 shall be designed to facilitate mold lift.