As advanced and moving Exposition, “After driving” is often at the top of the car contempt. As a car enthusiast who cannot be familiar with thousands of models, we should pass photos through photos, and the real train is to be a forefront or a back drive? Today, I will teach this little trick to everyone!
Judging the first method of the pre-drive or the back drive is through visual inspection The length between the front wheel and the door is also the “non-famous” code: L113 in the automotive design. This code refers to the distance between the front wheel axis to the driver’s foot, which can be simplified in the actual application, the wheel to the front end of the door. Among them, the L113 length of the rear drive will be significantly longer than the former driving type. So if the L113 distance of a car is longer, then it can be roughly inferred that it is a rear driver. 
Upper: Back Drive 1 Series: Pre-drive 1 Series
The L113 of the rear drive is long, which is mainly the cause of the engine. Because of the transverse engine of the typical front wheel drive model, the longitudinal to the longitudinal space will be large, and naturally, the length of the cabin will be submitted, and the L113 distance of the vehicle will eventually become longer.
The longer L113 distance can not only give the vehicle longer head, but also make the cab’s cockpit backward. In this way, the proportion of the whole car will be more coordinated and stretched. At the same time, the visual focus of the whole vehicle will be closer to the rear, so that the whole vehicle attitude seems to be more motion.
While using L113 as a basis for judgment, it can be guaranteed to drive without leakage. However, some front-drive platform models will have L113 as long as the L113 is as long as having a better-looking body side shape, and a more abundant collision zone. For example, Volvo’s S60, S90, and a new TLX in the song. Therefore, in order to ensure the accuracy of judgment, we need to look at the L113, and then look at the long-hit length of this car!
pre-hanging length, that is, the front wheel center to the front end of the vehicle bumper distance. In real life, the long-hanging length of the rear driver is to be significantly shorter than the former drive. The pre-hanging length of the former drive is longer, mainly because the front wheel position of the former front drive is limited by the transverse engine power transmission path.
In the automotive cabin, since the tank radiator must be left due to the front side of the cabin, no matter whether it is a horizontal front drive or a longitudinal drive type The actual position of the engine in the cabin is relatively relapsed. Among them, the power of the longitudinal engine model will be transmitted backwards. After the gearbox, the drive shaft finally reaches the rear wheel. In this process, since the relationship between the front wheel is not involved, it does not interfere with the placement position of the front wheel, and the front wheel can naturally be placed as much as possible to exchange better vehicle handling. And eventually present a short-hanging visual effect. It is like the four-wheel drive system that is mainly driven, as well as the Audi using longitudinally driven, will pass the power back to the front wheel in the gearbox position through a forward drive shaft, this form is not Will limit the placement position of the front wheel, and the short-hanging effect can also be achieved.
Former driving power transmission structure
can not do short-hanging effects in front of the front drive. To ensure maximum power transmission efficiency, all rails, gearboxes, and wheels are arranged on the same vertical level. Among them, the horizontal engine will be connected to the left and right gearbox, and the power is driven directly through the half-axis driven after the transmission. Although the entire power transmission is compact and efficient, due to the position of the engine in the cabinTherefore, the position of the front wheel must also move to the engine together, and the final length is naturally longer.
Through the figure above, we can find that although the new song TLX and Volvo’s S60 have a longer L113, but due to the horizontal layout Relationship, so their forward-hitting length does not do like the rear drown – BMW 3 Series is short. After mastering the identification method of L113 and the former hanging length, we can roughly determine that this car is the pre-drive or later. But if you want to guarantee that there is no loss, then we need to sacrifice the ultimate trick – through the position of the front wheel brake caliper, to judge before, after it is driven! 
Firstly, the conclusion, in the case of 99%, the rear driver The front brake caliper is installed behind the brake disc, and the front drive’s front calipers are installed in front of the brake disc. Therefore, by observing the front brake caliper position, the back drive is: After the driving is behind, the front drive is in front. The reason for this phenomenon is or is also in the form of an engine, that is, the transverse or vertical.
Before the front drum, the yellow is a steering pulley
If the model is transversible, due to the engine, the gearbox, the wheel must be kept in the same vertical On the horizontal plane, they will use the vertical space of the engine compartment to be exhausted in the mountains, and translatively plugged in front of the steering column coupled to the steering wheel. At this time, the steering column and the steering tie rod (such as the yellow) of the drive front wheel (such as the yellow color) can only be placed behind the engine, the “big mountain” of the gearbox. Plus the steering pulling rod will occupy a large part of the space on the suspension, so when the steering pulley is connected to the front wheel in the back position (as yellow), there is no margin to arrange the brake caliper. . Therefore, the front wheel brake calipers in front of the extension will be installed in front of the brake disc.
Mercedes-Benz C-stage, yellow, yellow as a steering pulley
After using a longitudinal engine, the caliper is installed behind the brake disc is because the vertical engine does not move like a transverse engine in the cabin, along with the gearbox. The space is covered, so the steering column of the vertical model is to avoid the longitudinal engine and the gearbox, and pass through the engine compartment with the steering tie rod located in front of the wheel (as shown in yellow). At this time, since the space around the front of the brake disc is occupied by the steering tensile rod, the caliper will naturally be moved to the position behind the brake disc. 
At this time, there may be a friend asked: For the longitudinally driver, the turning rod is placed in the engine like a front drive. Rear? The most important reason is that the gearboxes of the engine are not as compact like the engine, and are arranged left and right with the engine. The vertical gearbox is actually attached to the longitudinal engine (as shown in the figure above), and is placed behind the longitudinal engine. At this time, the volume of the vertical gearbox is usually very huge, so it is difficult to leave sufficient voids in the vertical space.
However, the front calipers of the driver are not without special cases, like the Infiniti Q50 and Nissan GT-R using the same chassis, and in addition to MC20 Maserati outside Maserati, the steering pulling rod has been rearward, and the final brake caliper moves to the front of the brake disc. However, this is also a price, in order to leave a sufficient position in order to give the rear shift rod, the longitudinal gearbox is raised up, and the engine must also be raised along with the gearbox. In this way, it will not only increase manufacturing cost, but also cause the center of gravity of the vehicle to become higher, equal to more spending money, there is a negative effect. Therefore, 99% vertical models will take the steering tensile rod, use the layout of the front wheel calipers.
When everyone eliminates from Nissan, Maserati, after the three special examples of Audi, it can use the method of the card position to determine the vehicle. The driver form is. Even the Porsche 911 after the rear rear drive, and the middle back driveLusters Evora applies to this method! 
through the front and rear positions of the front wheel, and the front of the head L113 and the front The visual measure of the suspension, we don’t need to judge a car or a back drive with a familiar configuration table. So here, I also congratulate all the readers reported by the radish, through this 10-minute reading, the useful knowledge is increased!