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Mazda patent shows rotary placement in complex AWD hybrid layout

If we were playing alt-powertrain Bingo, a recent Mazda patent application filed in Japan would be one or two letters from victory. What's exciting about the patent, discovered by Japanese outlet T's Media via Motor Trend, is that while it makes a case for an internal combustion engine of any configuration, one of the drawings showing a rotary engine. The wild bit is that the whole powertrain comprises the ICE, a transaxle, two tiny in-wheel electric motors turning the front wheels, a third electric motor in the driveline, a capacitor, a lithium-ion battery, and three inverters. Motor Trend parsed the mechanics, and the way it reads, Doc Brown couldn't have done a better job. The rotary engine at the front turns the rear wheels, but not directly. Instead of a flywheel on back of the engine, the drawing shows a 25-kW electric motor and an inverter, then a driveshaft running to the transaxle. Along the axis of the transmission tunnel in a normal car, between the inverter and the transaxle, lies a 3.5-kWh battery running at 48 volts. MT writes that the electric motor can add its output to the ICE output to drive the rear wheels, or the e-motor can turn the rear axle on its own. Up front, two inverters and a double-layer capacitor join the ICE in the engine bay. The capacitor and tiny hub motors in the front wheels run at 120 volts, a higher voltage than the rest of the electrical system, so that the small in-wheel motors can generate the same torque as a larger motor running at a lower voltage. The AWD system acts on-demand. Given the signal, the capacitors discharge their energy to the wheel motors, and recover energy from braking. When the capacitors are at full charge, they send excess regen energy to the lithium-ion battery; conversely, the battery can recharge the capacitors when they're low and the front hub motors need power. The patent explains that the ICE works with the rear e-motor to drive the rear wheels at low speeds, the front motors called on to "generate an output only when a large output is required in the high vehicle speed range." The rather complicated system is focused on providing the benefits of a hybrid system and all-wheel drive, but at lower weight than one would expect. A rotary serves due to its compactness, but one of the drawings shows an engine with a V layout. Hub motors get dinged for adding unsprung weight, hence the small motors here.

Mazda goes on engineer hiring binge as recovery picks up speed

Japan's larger automakers - companies like Toyota, Honda and Nissan - have tremendous engineering talent at their disposal. That's largely because, selling as many cars as they do, they've got more revenues to tap into. Logic might dictate, then, that smaller automakers like Mazda, which no longer has the deep pockets afforded to it by its former partnership with Ford, might have less of a budget and workforce for engineering. But Mazda has been raking in record profits, and it plans on cashing those revenues in by hiring a substantial new pool of engineers.
According to Automotive News, Mazda is preparing to hire as many as 185 new engineers over the next two years - almost four times as many as the 50 engineers it previously targeted. Many of those engineers will be put to work developing the second-generation, Skyactiv 2 technologies that are on the drawing board while the first round of Skyactiv features are still being rolled out.
The boost in recruitment is enabled by a positive fiscal year that ended last March, marking the first profits Mazda had logged in four years. Sources anticipate that the fiscal year culminating at the end of this month will mark the company's most profitable yet, netting over a billion dollars to eclipse the fiscal year that ended in 2008 when it recorded $872.5 million in profits.

Junkyard Gem: 2004 Mazda RX-8

You know when a type of vehicle has reached its value tipping point (where it's not worth fixing up a broken or crashed one) when examples of it begin showing up in the big American self-service wrecking yards. During 2016, the BMW Z3 and Mazda RX-8 reached that point and began to appear, just one at a time, here and there, but obviously they were the advance scouts for many to follow. Such cars usually get picked over in a hurry ... at first. Here's a well-stripped example of a first-year RX-8 I found earlier this year in a Denver yard. Some RX-7 owner probably nabbed the Renesis engine right away, and then the guys who grab late-model parts to flog on eBay were next. Still, plenty of interesting components remained on this car when I photographed it, and RX-8s that end up here in a year or two won't get swarmed by the vultures anywhere near as quickly. Does that mean that RX-8s are now cheap enough to race in the 24 Hours of LeMons? Could be! Related Video: Featured Gallery Junked 2004 Mazda RX-8 View 11 Photos Auto News Design/Style Mazda mazda rx-8