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Basic Continuously Variable Transmission explained with Legos

In recent years, the search for better fuel efficiency and smoother shifting has produced automatic transmissions with double-digit gears. Alternatively, the same quest has boosted the popularity and usage of a different type of automatic transmission without any fixed gears, the continuously variable transmission, or CVT. YouTuber Sariel's Lego Workshop recently took the time to build a CVT demonstration model out of Legos to help explain how they work. Sariel begins by showing the model's input and output shafts that are parallel to each other. Each shaft has a cone attached to it, and they are inversely placed so that the large part of one cone is next to the small part of the other cone. The two cones are connected using a rounded rubber band.  By shifting the rubber band up and down the cones, the machine changes the effective ratio between the cones. So, a 1:4 ratio can be smoothly transitioned to 4:1. No clutch is required to operate the mechanism, and it eliminates hitches or pauses between gear changes. CVTs are also advantageous over 9- or 10-speed automatics in that they are far less complex and weigh less.  To demonstrate how the CVT operates in a vehicle, Sariel used a joke about Top Gear. The original Top Gear is represented by a faster-moving car that has the rubber band around the large part of the cone on the input shaft. Top Gear without former hosts Richard Hammond, Jeremy Clarkson, and James May is represented by a slow-moving car with the rubber band around the large part of the cone on the output shaft.  For an even more detailed explanation of how CVTs work — albeit one that doesn't involve toys — you can click here. Technology Toys/Games Nissan Subaru

'Nothing is blocking' Nissan alliance talks, says Renault chairman

TOKYO — Nothing is blocking discussions between Nissan and Renault over the future of their alliance and the two companies will have "important talks" on Tuesday and Wednesday, the French automaker's chairman said in Tokyo. Speaking at an event on Tuesday, Renault SA chairman Jean-Dominique Senard touted the Franco-Japanese alliance, which has been discussing ways to revamp the relationship. The companies had initially set Tuesday as a deadline to hammer out a deal. However, the discussions have taken longer than originally expected due to Nissan's concerns about how its intellectual property rights can be protected as Renault forges new ties with China's Geely, sources have told Reuters. Renault last week unveiled a sweeping overhaul of its businesses, saying it would set up a joint venture with Geely for gasoline engines and hybrid technology and spin off its electric vehicles unit next year. It wants Nissan to invest in the new electric unit. The companies are also renegotiating their equity ties, which currently see Renault owning a controlling 43% of Nissan and the Japanese company holding only a 15% non-voting stake in Renault. "Nothing is blocking" the discussions, he told reporters after the event, declining to say when the alliance members would reach a deal and adding "you will be informed on time." "As the chairman of this alliance, I've never lived such a warm atmosphere within the alliance and this bodes well for the future."   Green Mitsubishi Nissan Renault

Nissan, Infiniti issue recall for replacement Takata air bags in older models

Nissan and Infiniti are recalling older vehicles that were repaired after collision damage to address problems with Takata replacement air bag inflators that were potentially installed. The overall campaign population is difficult for Nissan to pin down because the only vehicles impacted would be those that Nissan and Infiniti know to have been serviced with the replacement units in question. Officially, the recalled population numbers just 375, but Nissan says more than 18,000 cars could have the defective parts installed.  Drivers of 2001-2003 Nissan Maximas, 2002-2006 Nissan Sentras, 2007-2012 Nissan Versa Sedans/Hatchbacks, 2002-2003 Infiniti QX4s and 2006-2010 Infiniti M35s/M45s that had their vehicles repaired after a collision or theft should be aware that these deadly replacement parts may have been used.  "The potentially affected inflators may have been installed on vehicles after final remedy repair completion under the vehicle recalls as part of a subsequent theft or collision repair," Nissan's notice said. "Vehicles that received the subject parts prior to December 9, 2016, are not affected as they would have been subsequently included in the final remedy recalls and replaced with a final remedy driver and/or passenger air bag inflator. Nissan has identified 18,422 vehicles that may have had these parts installed during service." The air bag inflators in question were inadvertently shipped to service inventory between December 9, 2016 and November 12, 2021 — after the dangers of Takata's inflator design were known to the industry. Notices are already being mailed; owners will be asked to bring their cars in for inspection, and if defective parts are found, they will be replaced.  Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.