| Popis: |
A review of sources regarding classification of the gear trains with toothed wheels on fixed axes is given. A variety of classification systems and criteria are under consideration, which relate to the type of gears and gear pairs, meshing systems, axes position, etc. These specific characteristics overtake the variations in the type of initial surface and the angle of inclination of the tooth at the designed point; in the form of initial body on which tooth surface should be formed; by the relative position of initial bodies; according to the tooth shape and the types of tooth profile (involute, cycloid, epy- or hypocycloid, complete of circle arcs and straight lines), accordingly with relative positions of the axes. Gear pairs with the flat gear wheels are distinguished in the shape-generated surfaces. Involute gears are classified by the virtual number of teeth, different for spur, helical, crossed helical, straight bevel, etc. Hyperboloid gears are differentiated by the number of meshing zones and location of them relatively to the line of centers, as well as in according to the shape of initial surfaces of the conjugate links and type of meshing. Orthogonal worm gear pairs are classified in the form of the original body of the worm—cylindrical worm, globoid worm, flat worm gear pairs—with flat worm, with shifted axes; hypoid gear pairs; spiroid gear pairs—properly spiroid one and cylindrical spiroid gear pair—helicon. |
