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Tesla points to better range and efficiency with compact power steering patent

The Tesla Model 3's minimalistic interior. (Credit: Tesla)

Published

6 years ago

October 3, 2019

Simon Alvarez

Tesla’s electric cars are already among the most efficient vehicles on the market, and this is shown by the immense gap between the range and efficiency of the company’s vehicles compared to their competitors from veteran automakers. Part of the reason behind this is Tesla’s continued improvements in its vehicles, which are rolled out and adopted as soon as they are refined and ready.

One of these improvements appears to have been teased in a recently-published patent application. Simply titled “Steering System for a Vehicle,” the document describes a smart, novel way of designing a power steering system that is more compact and less power-hungry. In the patent’s background, Tesla remarked that conventional power steering systems, which are usually hydraulically operated, are mostly bulky and space-consuming.

This is due to power steering systems utilizing a number of components that include cylinders, pumps, hoses, and control valves, to name a few. Hydraulic power steering systems also have complex designs, which add cost to a vehicle. Lastly, conventional power steering systems generally require a large amount of power to function. With this in mind, Tesla argues that there is a need for a new power steering system that is simpler, smaller, and more power-efficient.

Illustrations showing different perspective views of Tesla’s steering system patent. (Credit: US Patent Office)

Tesla’s novel power steering design involves fewer parts than the conventional system used in most vehicles. The electric car maker describes the design in its patent in the description below.

“The steering system includes a drive motor having a motor shaft. The steering system also includes a first gear reduction stage for receiving a first rotational input from the motor shaft and providing a first rotational output. A first gear meshes with a second gear of the first gear reduction stage via a helical gear mesh. The steering system further includes a second gear reduction stage for receiving the first rotational output from the first gear reduction stage and providing a second rotational output.

“The second gear reduction stage may include at least one of a strain wave gearing, a worm drive, and a planetary gearing. In case the second reduction stage is a strain wave gearing, the second gear reduction stage includes an ovular coupler, a flexible coupling, an outer spline, and a plurality of bearing members disposed between the ovular coupler and the flexible coupling. The steering system includes an output shaft for receiving the second rotational output from the second gear reduction stage.”

Tesla notes that its smaller, power-saving steering system, apart from being more power-efficient and compact, also includes several failsafes, which could, in turn, increase a vehicle’s safety. The company’s patent mentions “sacrificial or failsafe components,” which are designed to safeguard a vehicle’s sensitive components during the event of a breakdown. Such a design will likely contribute to Tesla’s electric cars and their already-stellar safety ratings.

An illustration of a steering system for a vehicle, according to certain embodiments of Tesla’s patent. (Credit: US Patent Office)

“In some embodiments, steering system 102 has been shown to provide a 10% improvement over a hydrolytic steering system. Additionally, steering system 102 is a compact unit that consumes lesser space as compared to other steering systems that are commercially available in markets. Further, steering system 102 does not require large amount of additional power for operation. FIG. 6 illustrates a failure mode of steering system 102 in which one or more bearing members 244 of steering system 102 fail. Bearing members 244 of steering system 102 are designed to withstand high loads so that they do not fail during normal vehicle operation. However, bearing members 244 may be designed to withstand only a predetermined threshold of load. As a result, bearing members 244 fail when they are loaded beyond the predetermined threshold.

“For example, a bearing member 258 may eventually fail along a shear plane 260 when loaded beyond the predetermined threshold. Alternatively, bearing members 244 may undergo a bending failure, or any other type of failure. In such a situation, one bearing member 244 is a sacrificial or failsafe components, thereby safeguarding other components of vehicle, for example, drive motor 204 or an engine, against breakdown or seizing. More particularly, the one bearing members 244 fails, ovular coupler 238 locks and rotates with flexible coupling 240. Thus, steering system 102 can still be operated to allow vehicle to be driven for a certain distance and parked at an appropriate location. Bearing member 244 fails according to a sheer mechanism or another failure mechanism. Further, failed bearing member 258 can be replaced and vehicle can be reinstated without incurring any additional losses.”

It remains to be seen if Tesla’s compact power steering system will be adopted for the company’s upcoming vehicles. That being said, such a system is a perfect match for EVs such as the Tesla Semi, the Tesla Pickup Truck, and the Model S and X Plaid Powertrain variants. These are all large vehicles, and their success in the market will likely be determined in no small part by their range and efficiency. In this light, every single innovation that could optimize these vehicles’ efficiency will most definitely be appreciated. After all, the less power is consumed by subsystems such as a vehicle’s power steering unit, the more power there is to turn an electric car’s wheels.

The full text of Tesla’s compact, efficient power steering system could be accessed here.

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Simon Alvarez

Simon is an experienced automotive reporter with a passion for electric cars and clean energy. Fascinated by the world envisioned by Elon Musk, he hopes to make it to Mars (at least as a tourist) someday. For stories or tips--or even to just say a simple hello--send a message to his email, simon@teslarati.com or his handle on X, @ResidentSponge.

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Tesla removed from Charlotte’s approved EV list due to ‘safety issues’

City reps say it’s not because of Elon Musk’s political involvement, but instead because of safety issues.

Published

3 hours ago

June 24, 2025

Joey Klender

Credit: Tesla

Tesla has been removed from the Charlotte, North Carolina, City Council’s list of pre-approved electric vehicles that the city can purchase.

It’s not because of Elon Musk, Democratic council member LaWana Mayfield said, who urged her colleagues to remove Tesla. Instead, she claims it is because of “safety issues.”

She said (via WFAE):

“So it is not just the particular owner of this product. It is the fact that this product has been in multiple lawsuits because of safety issues, and there are multiple concerns.”

Recent data from Tesla shows that its vehicles are about half as likely to be involved in an accident when being driven normally. When Autopilot technology is used, it is about ten times safer than the average driver in the U.S., statistically.

Tesla Vehicle Safety Report shows Autopilot is 10x better than humans

Republican City Council member Ed Driggs stood up for Tesla, saying that:

“I think we just set a dangerous precedent if we have reasons that aren’t related to the cost and the performance of purchased items for excluding them. We already have Teslas in the fleet.”

If they’re so dangerous, why are they already in the fleet?

The NHTSA also shows that Ford is the most recalled car company in 2025, with 81 total recalls. Tesla has just five for the year.

Driggs said to Mayfield during the meeting:

“We are not identifying names on this list. You are singling out one name on this list for political reasons. You don’t have enough data on Tesla compared to the other car companies to suggest they shouldn’t be here. I object to trying to disguise this as anything other than a politically motivated desire to not have this name on this list.”

Tesla was successfully removed by a 6-3 vote. Democrats Danté Anderson, Malcolm Graham, Renee Johnson, Victoria Watlington, and Tiawana Brown supported Tesla’s removal. Republican Edwin Peacock, along with Driggs and Democrat Dimple Ajmera, all voted no on removing Tesla.

The City of Charlotte will buy 45 new electric vehicles, and Teslas would likely be the best option. Many local law enforcement agencies across the U.S. have utilized them and have shown that the vehicles contribute to massive maintenance and cost of ownership reductions due to the lack of overall upkeep.

Tesla police fleet is saving taxpayers $80k per year on fuel costs: report

This is not the first time that a city in the U.S. has chosen to go in a different direction with its EV fleet plans. Tesla was chosen over Ford by the City of Baltimore for a $5 million expenditure that would bolster its fleet with EVs.

However, earlier this year, Baltimore said it “decided to go in a different direction,” and although it was not directly confirmed, the move seemed to be political.

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Tesla threatened in France with claims of ‘deceptive’ practices

Tesla has been threatened by the Competition, Consumer Affairs, and Fraud Control Office in France after the agency said it is participating in “deceptive business practices” related to its semi-autonomous driving capabilities.

Published

5 hours ago

June 24, 2025

Joey Klender

(Credit: Tesla)

Investigators in the government office said that Tesla has engaged in deceptive commercial practices over the capabilities of its cars. In the past, other agencies and even some skeptics have said that Tesla’s use of the phrases “Autopilot” and “Full Self-Driving” is inaccurate in terms of its capabilities.

Tesla Autopilot gets stone cast in its direction by Pete Buttigieg

However, Tesla has been transparent with consumers and regulatory agencies that its cars are not yet fully autonomous, meaning drivers could sleep, play on their phones, or pay no attention to the road. The car would take care of steering and speed.

Tesla has never maintained that its cars are capable of this. On its website and in its Owner’s Manuals, it says that drivers are required to pay attention and be prepared to take over in case of an emergency.

The office began the investigation back in 2023 and, this week, ordered Tesla to comply with regulations within the next four months. If it does not, it will face fines of €50,000 per day.

This is not the first time Tesla has had some pushback from regulators regarding the naming of its semi-autonomous driving platforms. Back in 2023, then Secretary of Transportation in the United States, Pete Buttigieg, said the name “Autopilot” was not accurate because it is still a hands-on system:

“I don’t think that something should be called, for example, an Autopilot, when the fine print says you need to have your hands on the wheel and eyes on the road at all times. We call balls and strikes. I view it as something where it’s very important to be very objective. But anytime a company does something wrong or a vehicle needs to be recalled or a design isn’t safe, we’re going to be there.”

He then said that Autopilot and its interaction with the person operating the car is a “real concern.”

Elon Musk

Tesla Robotaxi launch draws attention from regulators, mainstream media milks it

The Tesla Robotaxi launch has resulted in some questions from the NHTSA, a typical thing for early launches. Media is milking it as a huge thing.

Published

7 hours ago

June 24, 2025

Joey Klender

Credit: @AdanGuajardo/X

Tesla launched its Robotaxi platform in a limited capacity earlier this week in Austin, Texas, and after hundreds of rides have been taken, some instances have caught the attention of the National Highway Traffic Safety Administration (NHTSA).

However, the information the NHTSA is requesting is routine and totally normal for the early stages of a rollout of this magnitude. But that did not stop mainstream media from milking it into something controversial, when it really is not.

Tesla Robotaxi riders tout ‘smooth’ experience in first reviews of driverless service launch

Various outlets reported on the NHTSA’s request to Tesla for additional information regarding things seen in videos online.

The NHTSA said it is “aware of the referenced incidents and is in contact with the manufacturer to gather additional information.” Bloomberg initially reported on the NHTSA’s request for information.

The thing is, the NHTSA has often reached out to companies right after it launches a driverless vehicle service. Both Waymo and GM’s Cruise, as well as Amazon’s Zoox, have had the NHTSA reach out to them regarding the launch of their driverless ride-hailing services.

The headlines for Tesla are significantly different:

Reviews from riders in Austin have stated the Robotaxi platform is “smooth” and “comfortable,” with many ranting and raving about the advantages the new ride-hailing service has over others. Not only is it being monitored by a safety monitor in the passenger seat, but there are also other things that make it unique.

One of the most notable is that your Robotaxi will automatically sync entertainment and streaming settings.

The sensationalism that the media tends to use with Tesla is a big reason the company did not invite mainstream outlets to the event. Instead, reporters were seen waiting for Early Access invitees to exit their cars to ask them questions.

Many denied the inquiries: