When pulling the steering wheel at low speed, is it troublesome that the tires of Porsche sound gorgorge?
Release date: 2018.10.02
"Gorigori" sound of the tire
When I cut the steering wheel at low speed on a cold weather day on the winter, the tires will sound "gorigori" "bolivoli"Sometimes.(For example, when going out from the parking lot to the left or right)There seems to be owner who inquires dealer, "Is this a problem?",In conclusion, this is not a problem.
My husband explained the reason for that the other day, but as I can not understand much like the example ... "Because I am not good at physics, I do not understand such theory (- _ -)", " This is not a physical problem but general common sense or w "and a lecture using a radio control began (* _ *)
Cause of tire "gorgorgi" sound
Porsche on the steering mechanism"Adopt Parallel steering geometry, not Ackermann steering geometry"are doing.
Ackermann steering geometry is what is commonly adopted in passenger cars. When traveling at ultra-low speed, when turning the handle large and trying to bend, the turning radius through which the left and right tires pass is different,When the front tire's right and left break angle are the same, it becomes difficult to bend.In order to prevent it, it is the Ackermann steering geometry that the setting of the front tire's breaking angle is set differently.
However, if you adopt Ackermann steering geometry,When turning the steering wheel during middle to high speed driving, it becomes impossible to make a smooth turn using the characteristics of the centrifugal force.For example, when turning to the right corner, the load to the left tire increases due to the centrifugal force and the load to the right tire decreases. By reducing the load on the inner tire, the turning performance improves more smoothly and it can be bent smoothly, but if you adopt Ackermann steering geometry, its characteristics will be lost.
thereSports cars and racing cars dare not adopt Ackerman steering geometry.Parallel steering geometry(Steering link mechanism in which the inside and outside turning angles of the front tire are set approximately equally in parallel)It is designed to be able to turn more smoothly when traveling at medium and high speeds.
Therefore, if you turn the steering wheel at a very low speed and turn it, the front wheel slips because the inside and outside angle of the front tire is almost the same"Gori Gori" "Boliv"An unusual noise is generated.
Also, because Porsche tires are made of high performance and heat resistant (Meaning of "N (number)" of Porsche certified tire and behind the scenes of approved tire development)Conversely, when the temperature in winter is low, it sounds like that due to the friction between a hardly cold tire block and asphalt.
In other words, this sound"Proof that Porsche is a sports car" "Proof that it is a high-performance tire"It is.
Proof that it is a Porsche
When I guess the reason why Porsche adopt parallel steering geometry,
① Enable to turn smoothly when turning the curve at medium and high speed
② The responsiveness improves when the steering wheel is turned off while driving
③ To suppress extra load and heat to the inner tire by circuit etc.
Is not that what it is. Her husband, when he noticed such a thing, wrote it on paper and explained it.(The characters are too dirty to read w)
While I was driving, I occasionally heard this "gorigori""Because my driving is bad, I hear a burden on the tires and this sounds like that."I thought. But I learned that it was not so, I was a little relieved (lol)
By the way,
"This gorigori, the sound of bolivar, is the proof of PorscheWhat If you don't like this sound, you'll get a Porsche. You should take a duck or a general passenger car! Rather, please boast about this sound! "
I was saying w
No, he's really deep inside.
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