Pronunciation: [pˈɪni͡ən wˈiːl] (IPA) 
The correct spelling of the word "pinion wheel" is /ˈpɪnjən/ /wiːl/. The first part, "pinion", is spelled with an "i" after the "n" instead of an "o" to represent the short "i" sound. The second part, "wheel", is spelled as expected, but with a long "e" sound due to the double "e". The pinion wheel is a gear wheel that meshes with a larger gear wheel, typically found in machinery and vehicles for power transmission.
A pinion wheel, also known as a gear wheel or a pinion gear, refers to a type of mechanism used in machinery that is responsible for transmitting motion between two rotating components. It is an integral part of a gear system and is typically meshed with another gear or an arrangement of gears known as a rack.
The pinion wheel is characterized by its toothed structure, which is designed to engage and rotate the larger gear or rack it interfaces with. This interaction allows for the transfer of torque and speed from one component to another, enabling the efficient transmission of power within a mechanical system.
Pinion wheels are commonly found in various applications, such as in automobiles and machines, where they play a crucial role in transmitting power and facilitating movement. They are widely used in steering systems, differentials, and other mechanisms that involve mechanical power transmission.
The design, size, and number of teeth on a pinion wheel often vary depending on its specific application. The teeth are typically aligned in such a way that they ensure a smooth and efficient meshing with the gear or rack it engages with, minimizing friction and slippage.
Overall, the pinion wheel serves as an essential component in gear systems, allowing for the transfer of motion and power between rotating components, and enabling the efficient functioning of various mechanical devices and equipment.
The word "pinion" comes from the Old French word "pignon", which means "small cogwheel". It originated from the Latin word "pinnulus", which refers to a small feather or a quill. The term "pinion wheel" is used to describe a gear with small teeth or cogs that meshes with a larger gear or rack. The "wheel" part of the term refers to the circular shape of the gear.
