Abstract
Fixed axis mechanical transmissions today have the largest spread on the entire planet, being practically used in almost all areas. From the gearboxes of the vehicles to the stationary reducers, used in the electrical, electronic and electrotechnical equipment, in the heavy industry but also in the light industry, in energy and in transport, practically the transmissions with fixed axes meet today everywhere, being part of our daily life. For this reason, we want to present the kinematic and dynamic analysis at a classic, manual, three-axis gearbox, with six speeds, without a direct socket. With the help of the presented method, one can analyze the dynamics of such a gearbox in order to design it optimally, so as to achieve the highest yields in operation, especially in the most used speeds, so that the transmission losses are limited to up.
Highlights
The beginning of the use of bar and gear mechanisms must be sought in ancient Egypt at least a thousand years before Christ
The great advantage of such a system is that the input and output gears are practically welded, i.e., the input shaft is attached to the output shaft in the main direct socket, the transmission ratio becomes 1 and the power lost in this step is very low
There is an additional gear wheel 14 which reverses the direction of rotation of the output shaft but only in the reverse gear 6
Summary
Gear reducers with gear wheels are used in kinematic schemes along with other types of transmissions: By belts, chains, friction, screw-nut, speed variator, gearboxes, etc. The main parameters of a gearbox are: Nominal power The transmission report mad Input shaft speed Distance between axes (standardized). Due to the multiple uses in the machine-building industry and various devices, the gear speed parameters are standardized Depending on these requirements, the following types of gear units can be used: Cylindrical, conical, conical-cylindrical, screw, cylinder-screw, planetary. Gear units with inclined cylindrical gear wheels, for small and medium installed powers, high peripheral speeds, silent gears. Gearboxes with cylindrical V-toothed gears, for high installed powers and low peripheral speeds (Fig. 7). The classic gearboxes, manual, the most widespread and most used, are mainly of three types: With two axes (Fig. 8), with three axes with welding the input and output shafts in the direct socket (Fig. 9), with three axles without welding shafts (Fig. 10)
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