變速箱對汽車動力影響的直接點就是變速箱傳動比對動力的影響，那么變速箱在發動機動力傳遞過程中所起到的作用是如何的呢？下面就來了解下相關內容吧。

　　The direct point of gearbox's influence on vehicle power is the influence of gearbox's transmission ratio on power, so what is the role of gearbox in the process of engine power transmission? Let's get to know the relevant content.

　　汽車速度的影響因素在于單位時間內發動機的輸出功率。這是一個籠統的說法，但如果要更詳細一點，就是單位時間內發動機動力傳遞給車輪的車輪扭矩值。在變速箱的整個動力傳遞過程中，發動機的動力在變速箱和尾齒輪的主從傳動比減速的情況下，會大大降低傳遞給車輪的發動機轉速，因此傳遞給車輪的扭矩將大于發動機工作時的輸出的扭矩。

　　The speed of a car depends on the output power of the engine per unit time. This is a general statement, but if you want to be more specific, it is the value of wheel torque transferred from engine power to the wheels per unit time. In the whole process of transmission power transmission, the engine power in the case of gearbox and tail gear master-slave ratio deceleration, will greatly reduce the engine speed transmitted to the wheel, so the torque transmitted to the wheel will be greater than the output torque of the engine when working.

　　與手動變速箱、雙離合變速箱、AT變速箱一樣，它們工作的核心是齒輪嚙合，即從動齒輪與從動齒輪的比扭矩原理。很多人也喜歡用山地車的傳動原理來解釋這個原理，變速箱的原理真的大致是這樣的。

　　Like manual gearbox, dual clutch gearbox and AT gearbox, the core of their work is gear engagement, that is, the principle of specific torque between driven gear and driven gear. Many people also like to use mountain bike transmission principle to explain this principle, the principle of gearbox is really roughly like this.

　　在低速時，變速器用直徑較小的主動齒輪帶動直徑較大的從動齒輪轉動。這種“小帶大帶”的齒輪轉動結構，會使直徑較小的主動齒輪承受較大的嚙合阻力和轉動阻力。此時，小直徑主齒輪旋轉數周后，大直徑從動齒輪僅旋轉一次。

　　At low speed, a driving gear with a smaller diameter drives a driven gear with a larger diameter to rotate. The gear rotation structure of "small belt and big belt" will make the driving gear with smaller diameter bear larger meshing resistance and rotational resistance. At this point, after several weeks of rotation of the small-diameter main gear, the large-diameter driven gear rotates only once.

　　山東變速箱維修人員認為在這種情況下，變速箱傳遞給車輪的轉速將非常低。這時，我們可以在“功率=轉速×扭矩”的公式中看到，在發動機輸出功率不變的情況下，低檔狀態下轉速降低，扭矩自然增大，車輪扭矩傳遞到車輪也發生了變化。

　　Shandong transmission maintenance personnel think that in this case, the speed of transmission to the wheel will be very low. At this time, we can see in the formula of "power = speed × torque", in the case of constant engine output power, the speed decreases in low gear, the torque increases naturally, and the torque transfer from the wheel to the wheel also changes.

　　在高速檔時，變速箱的主從動齒輪是一個大直徑的主齒輪帶動一個小直徑的從動齒輪，這意味著當主齒輪旋轉一次時，從動齒輪已經旋轉了幾次，因此傳遞到車輪的轉速會自然增大，然后車輪扭矩自然會減小。

　　In high gear, the main slave gear of the gearbox is a large diameter main gear driving a small diameter driven gear, which means that when the main gear rotates once, the driven gear has already rotated several times, so the speed transmitted to the wheel will naturally increase, and then the wheel torque will naturally decrease.

　　變速箱在汽車中的作用也是有目共睹的。例如，汽車變速箱可以改變傳動比，擴大驅動輪扭矩和轉速的變化范圍，適應頻繁變化的行駛條件；使發動機在有利條件下工作；在發動機轉動方向不變的情況下，車輛可以倒車行駛。此外，變速器可以利用空檔來中斷動力傳遞，使發動機能夠啟動和怠速，便于變速器換檔和動力輸出。

　　Gearbox in the role of the car is also obvious. For example, the automobile gearbox can change the transmission ratio, expand the range of driving wheel torque and speed change, adapt to the frequently changing driving conditions; Make the engine work under favorable conditions; The vehicle can be driven in reverse with the engine turning in the same direction. In addition, the transmission can use neutral to interrupt power transmission, enabling the engine to start and idle, facilitating transmission shift and power output.

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