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**0**

**5**

*Italy*

<sup>1</sup>*Politecnico di Milano*

<sup>2</sup>*Università degli studi di Brescia*

**The Role of the Gearbox in an Automatic Machine**

A *machine* is a system realized by many parts with different functions, linked each other to reach a defined task. Depending on the task, a classification of machines equipped with

• Drive machines (*motors*): these machines deliver mechanical power from other forms of energy. If their purpose is simply to make placements or generate forces/torques, they are

• Working machines (*users*): these machines absorb mechanical power to accomplish a specific task (machine tools, transportation, agricultural machinery, textile machinery,

• Mechanical transmissions: these machines transmit mechanical power by appropriately changing values of torques and speed. Mechanical transmissions are generally made up of *mechanisms* that have been studied (mainly from the point of kinematic view) to connect

The combination of a motor, a transmission and a mechanical user is the simplest form of

In servo-actuated machines, the choice of the electric motor required to handle a dynamic

The choice of the transmission plays an important role in ensuring the performance of the machine. It must be carried out to meet the limitations imposed by the motor working range and it is subjected to a large number of constraints depending on the motor, through its rotor inertia *JM* or its mechanical speed and on the speed reducer, through its transmission ratio *τ*,

This chapter critically analyzes the role of the transmission on the performance of an automatic machine and clarifies the strategies to choose this component. In particular, it is treated the general case of coupled dynamic addressing the problem of inertia matching and presenting a methodology based on a graphical approach to the choice of the transmission. The identification of a suitable coupling between motor and transmission for a given load has been addressed by several authors proposing different methods of selection. The most common used procedure are described in Pasch et al. (1984), Van de Straete et al. (1998), Van de Straete et al. (1999), Roos et al. (2006). In these procedures, the transmission is

load, is closely related to the choice of the transmission Giberti et al. (2011).

its mechanical efficiency *η* and its moment of inertia *JT*.

moving parts can be done. In particular, one can distinguish:

**1. Introduction**

called *actuators*.

motors and users.

machine.

machine packaging, etc.).

Hermes Giberti1, Simone Cinquemani1 and Giovanni Legnani<sup>2</sup>

