The Simple Engineering Beauty of a Car’s Transmission.

Long time readers will know I’m something of a petrol head. It’s an obsession that grew out of my introduction to all things automotive at a young age when my parents let me ride around our property on our little Honda Z50 which continued on through multiple bikes and cars as I grew older. Since these cars were usually bound for the scrap heap keeping them running wasn’t something I (well my parents, really) had much interest in spending money on so I became intimately acquainted with the inner workings of late model Datsuns. Whilst I don’t bother diving under the hood of my current car very often the interest in the technology that drives them hasn’t faded as demonstrated by my fixation on this video:

The one area I never really wanted to touch was transmissions, mostly because they’re one of the hardest parts of the car to work on and taking them apart is fraught with danger for unqualified hacks like myself. Whilst I knew the basics of how transmission worked I didn’t know the complex dynamics of power transmission through the varying gears. Whilst this video might not be reflective of how current transmissions work (indeed that’s a world’s a worlds away from how an automatic works, to my understanding) the fundamentals are still there in beautiful 1930’s video glory.

What I’d really be interested to see is the gear work behind some of the advanced transmission schemes that power some of the more modern cars like Volkswagen’s Direct-Shift Gearbox (which is essentially 2 gearboxes working in tandem). There’s also the Continuously Variable Transmission which has the peculiar behavior of letting the engine rev itself out whilst it gradually gears up. This can allow a driver to peg the engine at its optimal RPM and keep it there until the desired speed is reached. Although this is typically undesirable as it feels like clutch slippage in a traditional transmission so many CVT based cars have “gears” that are essentially different response profiles. There’s even more exotic things on formula 1 cars but that’s whole other world to me.

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