Tire "gurgling" sound

A "gurgling" or "bobbing" sound from tires when steering at low speed on a cold winter dayThere are times when(for example, when exiting a parking lot by making a right or left turn)Some owners ask their dealers, "Isn't this a glitch?" Some owners may ask their dealers, "Isn't this a defect?In conclusion, this is not a glitch.

The other day, my husband explained the reason for this, but as usual, I didn't really understand it... "I'm not good at physics, so I don't understand such theories (-_-)," I said, "This is not a physics problem, but general knowledge," and he started lecturing me using a radio-controlled car! (*_*)

Causes of tire "gurgling" sound

Porsche, with respect to the steering mechanismInstead of Ackermann steering geometry, parallel steering geometry is used."The company is doing so.

Ackermann steering geometry is what is used in many common passenger cars. When driving at very low speeds and attempting to make a turn by turning the steering wheel wide, the turning radii through which the left and right tires pass are different, soIf the left and right cutting angles of the front tires are the same, it will be difficult to turn.To prevent this, the Ackermann steering geometry is set up so that the front tires have different cutting angles.

However, with the Ackerman steering geometry, theWhen the steering wheel is turned at medium to high speeds, it is no longer possible to make smooth turns taking advantage of the characteristics of centrifugal force.For example, when turning a right-hand corner, centrifugal force causes a greater load on the left tire and a smaller load on the right tire. The lighter load on the inside tire allows the vehicle to turn more smoothly with better turning performance, but this characteristic is lost when Ackermann steering geometry is used.

thereforeSports and racing cars dare not adopt Ackermann steering geometry.Parallel Steering Geometry(Steering link mechanism in which the inside and outside cutting angles of the front tires are set approximately equal and parallel to each other.)The design of the new model employs a "M" (Mixed) design to enable smoother turning at medium to high speeds.

Therefore, when the steering wheel is turned wide at very low speeds, the inside and outside cutting angles of the front tires are almost the same, causing the front wheels to skid and the front wheels to slide sideways.Gurgling, bobbing.The noise is called "the noise.

Also, because Porsche tires are made of high-performance, heat-resistant materials (seeThe Meaning of the "N" (Number) in Porsche Certified Tires and Behind the Scenes of Approved Tire Development.)On the other hand, when the temperature is low in winter, the friction between the hard, cold tire blocks and the asphalt makes that sound.

In other words, this sound is"It's proof that Porsche is a sports car and a high-performance tire."It is.

The proof that it is a Porsche

I'm guessing why Porsche is using parallel steering geometry.

(1) Ensure smooth turning around curves at medium and high speeds
(2) Improved responsiveness when steering wheel is turned while driving
(iii) Reduce excess load and heat on inner tires at circuits, etc.

I guess that's what it means. And so my husband found himself writing it out on paper and explaining it to me.（I can't read it because the handwriting is too dirty.)

I used to hear this "gurgling sound" sometimes when I was driving.I'm making this noise because I'm a terrible driver and I'm putting a lot of stress on my tires."I had thought so. But I was a little relieved to learn that was not the case (laughs).

My husband, by the way.

."This gurgling, burbling sound is the proof of a Porsche.What? If you don't like this sound, don't ride a Porsche. You should ride a luxury domestic car or a general passenger car! Rather, I want you to brag about this sound! "

He said w

Wow, sports cars are really deep.