![](/assets/images/picto-drapeau-france-3a76576a5d60a512053b4612ab58dae5.png)
4. Conclusion
A vehicle with an internal combustion engine needs a transmission to adapt the available engine power to the power demand at the axle.
The power required by the axle depends on the driving conditions encountered. These vary, which is why a gearbox needs to have several ratios.
This article sets out the basis on which gear ratios can be objectively determined at first glance. In fact, other constraints, which are not driveability or traction constraints, can influence or modify the basic gear ratios, the number of ratios, or even the type of transmission chosen.
We're thinking in particular of environmental and energy constraints (pollutant emissions, CO 2 ) on which the transmission plays a role, through its own efficiency or the engine's operating point.
...
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
![](/assets/images/logo-eti-286623ed91fa802ce039246e516e5852.png)
The Ultimate Scientific and Technical Reference
This article is included in
Hydraulic, aerodynamic and thermal machines
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Conclusion
Bibliography
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
![](/assets/images/logo-eti-286623ed91fa802ce039246e516e5852.png)
The Ultimate Scientific and Technical Reference