Elements of ED mechanical part

If electric motor or actuator mechanism is of rotational motion ED mechanical part in most cases comprises definite gear number. And when the actuator mechanism is of reciprocal or translational motion and the motor is of rotational motion, the mechanical part must also have the converting elements that convert the type of mechanical motion.

The basic MTD elements are:

- transmissions;

- converting links.

The gears don’t turn the type of mechanical motion (it is still rotational), but only change parameters of rotational motion.

Types of transmissions are:

- gears;

- worm gear;

- belt drives;

- chain drives;

- friction drives.

Types of converting links are:

- cable drum;

- crank-shaft mechanism;

- screw nut;

- steering gear;

- link gear;

- linkwork-leverage mechanism;

- cam mechanism.

Ratio of output velocity V of translational motion and input angular velocity  is typical for converting mechanism from the point of kinematic view.

Depending on all this all converting mechanisms are divided into 2 groups:

The 1^st group: :

- cylindrical cable drum;

- crank-shaft mechanism;

- screw and nut mechanism and other.

The 2^nd group: :

- steering gear;

- link gear;

- linkwork-leverage mechanism;

- cam mechanism and other.

For rotating ED with gears:

,

Where ωp – angular velocity of AM;

ωi - angular velocity of electric motor rotor or any element of kinematic link from motor to actuating mechanism.

The rarely application of so-called cross wheel can be an exception.

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