Gear wheel - an indispensable part of the machine

Transmitting or converting motion in variousmechanisms and devices is carried out by means of gear or worm gears. This is the most common method in modern engineering and the design of various devices.

The main element of the worm or geartransmission is a cogwheel. A more simple and economically viable alternative to such a design invention, modern engineers have not yet found. Motion converters, in which the gear wheel is used, are reliable and durable in operation, compact and have a high coefficient of efficiency. This type of transmission can transmit significant power for all its ease of use.

However, the manufacture of gears requireshigh accuracy. In case of incorrect calculations and errors in the design or incorrect installation of these parts, operation leads to rapid wear and breakdown of the equipment, excessive noise and destructive vibrations.

In modern instruments and engineering inAs a basic material for the production of parts, various types of improved, specially processed steels are commonly used, which have long proven to be durable, wear-resistant materials. However, advanced technologies of Western and domestic manufacturers allow replacing metal alloys with lighter plastics and composites.

Gear wheel in the manufacture of whichused textolite, polyurethane, nylon or laminated plastic, will facilitate the construction, will avoid vibration or additional noise and rumbling. In mechanisms where high loads are not required, the plastic will be more reliable and durable. The use of cogwheels from these materials will cost considerably less. And excellent anti-corrosion properties will extend the life of the part.

Classification of these elements is carried out independing on the location of their axes, the method of engagement, structural design and profile shape. Distinguish spur, helical and chevron wheels, with external or internal gearing, conical, cylindrical, worm and screw gears.

Each gear of the mechanism can rotateas in one, and in the opposite direction, to transform the rotation of the shaft into translational motion by means of rack and pinion transmission. The choice and calculation of a particular part is carried out depending on the purpose, technical characteristics and types of movement.

For the exact design of the gear wheelit is necessary to conduct mathematical calculations on certain formulas, using information from regulatory documents and directories for engineering. The main parameters of the part necessary for the design include the number of teeth, the diameter of the wheel along the outer protrusions and valleys, the pitch diameter of the wheel, the height of the tooth that is composed of the height of the head and the tooth foot, and the pitch of the engagement.

When choosing the material for the gear wheel, the flexural strength in the dangerous sections at the base and at the tooth engaging pole is calculated.

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