Automotive Practical Manual (8) Precautions for Manual Gear Reversing
[Car Guide] Recently, a friend of mine just bought a new car with manual transmission. After driving for a while, he told me that sometimes you can’t put it in reverse when you reverse, and you can often hear the sound of "honk". I don’t know why. I looked it up on the Internet and found that many netizens also have many problems in the use of manual gear reverse. Today, we will talk about the precautions for the use of manual gear reverse.
● Reverse gear structure
If we want to know what we need to pay attention to when shifting the reverse gear, we should first understand the structure of the reverse gear. I believe that friends who have driven manual transmission vehicles know that many manual transmission vehicles will have reverse gear locking devices, which need to be unlocked before they can be engaged in reverse gear. This is to prevent the vehicle from being engaged in reverse gear by mistake when moving forward, which will cause great impact on the transmission gear and cause parts damage. The locking mechanism of the reverse gear is generally locked by the error-proof baffle. The following video is to introduce the working principle of the error-proof baffle for everyone:
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● The way of hanging reverse gear.
The operating modes of gears on different models also have different designs. At present, there are three ways to unlock gears in reverse, namely:Traditional unlocking, lifting unlocking and pressing unlocking.There are also some special unlocking methods, such as Angola’s reverse gear unlocking method is similar to the automatic gear button, and there is also a manual transmission, which shifts to the left of the first gear. If you need to shift the reverse gear, you must shift the shift lever to the left, and then dial one square to the left hard after stopping.
After introducing the locking mechanism, let’s talk about the reverse gear. For family cars,Reverse gears are generally straight tooth gear structures.The main reason is that the structure is simple and the manufacturing cost is low, because the car is completely at rest when the gear is reversed, and there is no speed difference between gears, so it is unnecessary to use the helical gear and these parts; In addition, the chances of using reverse gear are much less than that of forward gear, so it is not a big problem to use straight gear. Of course, the reverse gear of the manual gearbox equipped with some high-end models is also designed with synchronizer and helical gear, which is to improve the comfort when reversing.
● Pay attention to reverse gear!
At the beginning of the article, I mentioned that my friend often made a "rattle" noise when he engaged the reverse gear, which was caused by his irregular movement when he engaged the reverse gear, resulting in a poor engagement between the shift fork (the position indicated by the red arrow A in the picture) and the reverse gear lock ring (the position indicated by the blue arrow B in the picture).
If the teeth are frequently punched, the crown of the gear will be rounded, and the meshing between the gears will not be complete. Moreover, if this operation is often done, the baldness will become more and more, resulting in a vicious circle. The gear meshing will not be complete, which will easily lead to the phenomenon of gear shift after a slight vibration. At this time, it is necessary to overhaul the transmission.
So how to avoid gear beating? We have summarized the methods to avoid gear beating when shifting gears at three o’clock. Let’s introduce them one by one:
(1) Stop and hang again.
The car has not stopped completely, but it is put into reverse gear. This is a bad habit that many "old drivers" love to make. It seems that they are very skilled in driving. In fact, this is very harmful to the gearbox. As mentioned above, most family cars have no synchronizer in reverse gear, so it is inevitable to put into reverse gear if they don’t stop the car stably. Therefore, when putting the car in reverse gear, we need to pay attention to stepping on the brake to stop the car and then put it on. This does not mean that you are driving meat, but a professional.
Step on the bottom
Secondly, when you step on the clutch in gear, you must step on the clutch to the end. Never put the clutch in reverse gear when it is still half-linked, which will also cause the phenomenon of tooth-beating. In addition, when you put the gear in reverse gear, you should be gentle and not too hard, so that you will occasionally hear the painful gear crash.
③ Back up and wait.
Finally, don’t reverse the car too fast, and don’t step on the accelerator to accelerate it, which will cause great damage to the spur gear. In addition, the transmission of the spur gear is very direct and the ride comfort is poor, so the people in the car will feel very uncomfortable and the sound is not very good.
After sharing the precautions for using the reverse gear, I have another trick to share with you: on many vehicles, the teeth of the reverse gear are bigger than those of the first gear, so the transmission is bigger than that of the first gear. If you encounter a ramp or road tooth that you can’t get up, you can try using the reverse gear.
Summary of the article:
That’s the end of the introduction of the precautions for using manual gear reverse. In fact, I just summarized some common preventive measures. I hope that if the majority of netizens have any experience about using manual gear reverse, they can post it in their comments or my editing blog. We can learn from each other and share our good experiences with more people. (Text/Figure car home Zhang Xin)
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