In electronic technology, aviation and navigation of precision instruments, often use modular less than or equal to 1 mm of tooth small modulus gear wheel, generally known as small modulus gear.
Because of the use of pitchgear is different, the form of its rotation and the type of gear are also different. The general classification of gear is divided into three categories according to the relative positions of the two gear axes configured in the mechanism: the two axes are parallel to each other, two axes intersect and two axes are staggered (neither parallel nor intersection).
For parallel shaft drive with straight gear, oblique gear cylindrical gear; straight gear, oblique gear inside gear; straight gear, oblique gear, these gears are generally known as "plane gear".
For intersection shaft transmission with straight, oblique and arc conical gear, straight face gear. Used for staggered shaft transmission are spiral gear, worm gear, hyperbolic gear and quasi-hyperbolic gear. These gears are often known as "space gears".
Definition of the gear modulus
"Mous" refers to the ratio of the distance t to the PI π (m=t / π) in millimeters. Modulus is a ^ basic parameter of modular gear. The larger the modulus number, the higher the wheel teeth and the thicker. If the number of teeth of the gear is certain, the radial size of the wheel will be larger. The modular number series standards are formulated according to the requirements of design, manufacturing and inspection. For gears with non-straight teeth, the modulus has normal modulus mn, end face modulus ms and axial modulus mx, They are the ratio of their respective tooth distance (normal tooth distance, end face tooth distance and axial tooth distance) and PI, which are also measured in mm. For bevel gear, the modulus has large end modulus me, average modulus m and small end modulus m1. For tools, there are corresponding tool moduli mo, etc. Standard moduli are widely used. In the metric gear transmission, worm drive, synchronous tooth belt drive and ratchet, gear coupling, spline and other parts, the standard module is a basic parameter of ^. It plays a basic role in the design, manufacture and maintenance of the above parts (see cylindrical gear transmission, worm transmission, etc.).
