2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16
Transmission or transformation of movement in various mechanisms and devices is carried out using gear or worm gears. This is the most common method in modern mechanical engineering and the design of various devices.
The main element of a worm or gear drive is a gear wheel. Modern engineers have not yet found a simpler and more cost-effective alternative to such a design invention. Motion converters, in which a gear wheel is involved, are reliable and durable in operation, compact and have a high efficiency. This type of transmission can transmit significant power for all its ease of use.
However, the manufacture of gears requires high precision. In case of incorrect calculations and design errors or incorrect installation of these parts, operation leads to rapid wear and tear of equipment, excessive noise and destructive vibrations.
In modern devices and mechanical engineering, various types of improved,specially treated steels, which have long established themselves as a durable, wear-resistant material. However, advanced technologies of Western and domestic manufacturers make it possible to replace metal alloys with lighter plastics and composites.
A gear wheel, in the manufacture of which textolite, polyurethane, nylon or wood-laminated plastic was used, will facilitate the design, avoid vibration or additional noise and rumble. In mechanisms where the transmission of large loads is not required, plastic will be more reliable and durable. The use of gears made of these materials will be much cheaper. And excellent anti-corrosion properties will extend the life of the part.
The classification of these elements is made depending on the location of their axes, the method of engagement, design and profile shape. There are spur, helical and herringbone gears, with external or internal gearing, bevel, cylindrical, worm and screw gears.
Each gear wheel of the mechanism can rotate both in one direction and in the opposite direction, convert the rotation of the shaft into translational motion using rack and pinion. The choice and calculation of a particular part is carried out depending on the purpose, technical characteristics and types of transmission of movement.
For the precise design of a gear, it is necessary to carry out mathematical calculations according to certain formulas, using information from normative documentation and manuals for mechanical engineering. ToThe main parameters of the part required for design include the number of teeth, the diameter of the wheel in terms of external projections and cavities, the pitch diameter of the wheel, the height of the tooth, which is the sum of the height of the head and the root of the tooth, and the engagement pitch.
When choosing a material for a gear wheel, bending strength is calculated in dangerous sections at the base and in the gearing pole of the teeth.
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