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Old 09-21-2018, 07:16 AM   #1
AVANTI R5
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Default Mazda Flips Rotary Engine, Shrinks It Down For Range Extender

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Mazda Flips Rotary Engine, Shrinks It Down For Range Extender
The compact, single-rotor engine sounds exactly like revived rotary that a Mazda exec is teasing.

A new patent from Mazda has the Japanese automaker describing a way to mount a rotary engine on its side for better packaging as an electric vehicle's range extender. The company registered for the patent in Japan on August 31, 2018, and the Japan Patent Office published it on September 19, 2018.

Mazda Rotary Engine Patent
The way Mazda sees it, the Wankel rotary engine's compact size is perfect to function as a range-extender. For even better packaging, the company wants to mount the powerplant horizontally under the rear cargo floor. However, an inherent issue with the Wankel is that it requires a small amount of oil injection into the combustion chamber in order to lubricate the spinning rotor. This patent describes what Mazda's engineers believe is the best way to orient the oil injector for this layout.

The Rotary Is Still Rolling:

The engineers create an angled, L-shaped passage for the oil injector (see the figures 31, 31a, 80, 81, and 82 in the image below). From this position, the lubrication shoots down diagonally (figure 88) and covers the entire inner wall (figure 64) of the combustion chamber to grease the corner of the rotor as it moves past.

Mazda says that putting the oil injector at the top of the chamber and have it shoot downward would also work. However, this setup would make the powerplant longer vertically, which is what the company is trying to avoid so as to maximize rear cargo space.

In March 2018, Martijn ten Brink, Vice President of Sales and Customer Service for Europe, confirmed that the company intended to revive the rotary as an optional range extender for an upcoming vehicle. Like the powerplant described in this patent, ten Brink said the engine had a single-rotor layout and no turbocharger. He indicated the mill would sit as low as possible for a better center of gravity and be "as big as a shoebox."

Source: Japan Patent Office

https://ipforce.jp/patent-jp-B9-6390553

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Old 09-21-2018, 04:31 PM   #2
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I've been advocating for tiny range extenders for over a decade. Design an ultra-quiet, ultra-damped little 0.5L single or twin, and stuff it in some corner of the car. Done.

Love that Mazda is toying with this idea!
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Old 09-21-2018, 05:25 PM   #3
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This.....might actually be a good application for a rotary; kudos to Mazda.
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Old 09-21-2018, 05:28 PM   #4
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I've always thought a serial hybrid with a small turbine running as necessary to charge the battery was a cool idea. Run the engine at maximum efficiency to charge when necessary, and shut it down when you have the specified battery charge.
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Old 09-21-2018, 09:57 PM   #5
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Unfortunately, maximum efficiency for a rotary is neither quiet or efficient, and the smaller it gets the worse the efficiency will be.
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Old 09-22-2018, 12:02 AM   #6
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Quote:
Originally Posted by Calamity Jesus View Post
Unfortunately, maximum efficiency for a rotary is neither quiet or efficient, and the smaller it gets the worse the efficiency will be.
Dude, you’ll tick off all the geniuses here at Nabisco with that talk. For the record I am not a genius, but I did stay at a HoJo last night.
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Old 09-22-2018, 12:50 AM   #7
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Quote:
Originally Posted by Calamity Jesus View Post
Unfortunately, maximum efficiency for a rotary is neither quiet or efficient, and the smaller it gets the worse the efficiency will be.
for its intended purpose here, it can spend all its time at peak efficiency so its not an issue. im quite sure mazda has it figured out.
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Old 09-23-2018, 05:36 PM   #8
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Can’t wait to hear more about this. Hope they bring it here too.
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Old 09-23-2018, 05:53 PM   #9
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Just kill the rotary already, there won't be room to create enough power to be effective and be silent. They could do the same thing with a micro turbine engine. I'm not sure why mazda won't just accept that design is a fail. Internal combustion engines are going to be phased out anyway, they need to focus on the transition.
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Old 09-23-2018, 06:02 PM   #10
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Quote:
Originally Posted by 2slofouru View Post
Just kill the rotary already, there won't be room to create enough power to be effective and be silent. They could do the same thing with a micro turbine engine. I'm not sure why mazda won't just accept that design is a fail. Internal combustion engines are going to be phased out anyway, they need to focus on the transition.
mazda will outlive tesla.
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Old 09-23-2018, 06:03 PM   #11
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Originally Posted by n2oiroc View Post
mazda will outlive tesla.


Only if Tesla renames the company and mazda decides to manufacture electric motors for them
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Old 09-23-2018, 08:19 PM   #12
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Originally Posted by 2slofouru View Post
Only if Tesla renames the company and mazda decides to manufacture electric motors for them
mazda makes more money in 1 minute than tesla has its entire existence. but hey, maybe next quarter.....
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Old 09-24-2018, 10:06 AM   #13
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We should withhold judgment on this until it comes to market. It could be good.
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