Engine iscarIts layout is the most important part of the overall layout of the car. In order to meet different requirements, the overall structure and layout of the car are different. The position of the modern automobile engine in the automobile can be divided into three types: front, middle and rear.
As far as trucks are concerned, the front engine is currently the most widely adopted form of arrangement. Its advantage lies in the versatility of the engine, both in-line and horizontal can be installed, and V-type engine can be used, which is also convenient for maintenance. In addition, the floor height of the cargo box is relatively low, and the requirements of the whole vehicle on the road surface are relatively low. Compared with the front-mounted engine, the mid-mounted and rear-mounted engines have poor versatility; only horizontal engines can be used, which is also very inconvenient for maintenance. The floor of the cargo box is relatively high and the requirements on the road surface are relatively high.
The advantage of the mid-engine engine is that the axle load distribution is reasonable, the noise and vibration in the cab are light, and the height of the driver's seat is low. The most prominent advantage of the rear engine is that because the cab is far away from the engine, the room is hardly affected by the noise and vibration of the engine. At present, rear-mounted engines are not widely used in trucks. They are only used when cars with rear-mounted engines are transformed into trucks. At present, most cars adopt the front-mounted form. The advantages of car engines using the preface form are the simple operating mechanism and the cooling of the engine. The conditions are good, the defrosting and heating mechanism is simple, and the suitcase size is large.
In order to meet different requirements, the overall structure and layout of modern cars are different, according to the engine and each ass
Engine iscarIts layout is the most important part of the overall layout of the car. In order to meet different requirements, the overall structure and layout of the car are different. The position of the modern automobile engine in the automobile can be divided into three types: front, middle and rear.
As far as trucks are concerned, the front engine is currently the most widely adopted form of arrangement. Its advantage lies in the versatility of the engine, both in-line and horizontal can be installed, and V-type engine can be used, which is also convenient for maintenance. In addition, the floor height of the cargo box is relatively low, and the requirements of the whole vehicle on the road surface are relatively low. Compared with the front-mounted engine, the mid-mounted and rear-mounted engines have poor versatility; only horizontal engines can be used, which is also very inconvenient for maintenance. The floor of the cargo box is relatively high and the requirements on the road surface are relatively high.
The advantage of the mid-engine engine is that the axle load distribution is reasonable, the noise and vibration in the cab are light, and the height of the driver's seat is low. The most prominent advantage of the rear engine is that because the cab is far away from the engine, the room is hardly affected by the noise and vibration of the engine. At present, rear-mounted engines are not widely used in trucks. They are only used when cars with rear-mounted engines are transformed into trucks. At present, most cars adopt the front-mounted form. The advantages of car engines using the preface form are the simple operating mechanism and the cooling of the engine. The conditions are good, the defrosting and heating mechanism is simple, and the suitcase size is large.
In order to meet different requirements, the overall structure and layout of modern cars are different, according to the engine and each assembly phase a. Front-engine and rear-wheel drive (FR): Most trucks at home and abroad, some cars and some passenger cars adopt this traditional driving mode.It is front-wheel steering, rear-wheel drive, and the engine output power passesclutch——transmission——transmission shaftDelivered toDrive axleTo the left and right after deceleration and increase in torqueHalf shaftOn the upper side, the rear wheels are driven to make the car run, and the front and rear wheels perform their own duties. The steering is separated from the driving, and the load distribution is relatively even.
b. All-wheel drive (NWD): a unique form of off-road vehicles. (Such as BJ2020 Cherokee, etc.).Usually the engine is front-mounted, and it is installed behind the transmissionSplitter, In order to transmit the power to all wheels separately. All-wheel drive has good power, strong climbing and off-road capabilities. However, compared with separate front and rear wheel drives, the structure is complicated, the cost is high, and the transmission efficiency is low. car repairMaintenance net
c. Front-engine, front-wheel drive (FF): It is an arrangement that became popular on domestic and foreign cars in the 1990s. In order to shorten the length of the vehicle and reduce the quality of the car, the engine is often placed before the front axle, and everything after the transmission is moved forward. The transmission and the drive axle are integrated and fixed next to the engine. The power is directly transmitted to the front wheels to reduce The height of the chassis improves the handling stability at high speeds.For example, the common Audi 100 cars and mini cars (Xiali, Alto, etc.) all use the front-engine, front-wheel drive drive train arrangement. The common front-engine, front-axle drive cars also have two configurations: one is Engine axis andFront bridgeParallel horizontal type (such as Xiali cars); the second is the engine vertical type (such as Santana, Audi and other cars).
d. Rear-mounted engine, rear-wheel drive (RR): It seems to be a replica of the FF car, but the "internal organs" in the front of the car are moved to the rear of the car. This kind of vehicle maintains the advantages of the FF vehicle and eliminates the disadvantages of the FF vehicle. As the interior layout of the vehicle tends to be reasonable, and the noise and temperature inside the vehicle have been improved, it has been favored by users with its unique structure and good performance. welcome.
2. Front-engine front-wheel drive
The advantages of the structure: a. The front engine and front-wheel drive increase the front axle load, the car has obvious under-steer performance, and improves the excellent high-speed driving maneuverability and stability. The front axle load is increased by nearly 60%, and there is a clear trend of understeer. . In addition, because the front wheels have driving force, the lateral deviation rigidity of the front wheels is reduced, and the tendency of the car to understeer is increased, thereby ensuring the safety of high-speed driving.
b.The engine is front-mounted, the front-wheel-drive horizontal engine has a short transmission line, and the front engine compartment is compact in size, which can improve the utilization of the space in the car;CrankshaftIt is parallel to the front drive shaft of the car, eliminating the need for spiral bevel gear transmission (the main transmission gear of the main drive can be cylindrical gear), reducing transmission noise and simplifying the process. Reduced parts and costs; high transmission efficiency, coupled with the small mass of the whole vehicle, make the car have good fuel economy.
c. The clutches, transmissions, and driving wheels of the front and front-wheel drive transmission devices are all arranged on the front of the car, making the front of the car relatively shorter. Due to the elimination of the longitudinal transmission shafts, the height of the chassis is reduced and the vibration is reduced. There is no need to set up a raised drive shaft channel, which maximizes the inner volume of the cabin; reduces the floor of the luggage box, increases the space of the luggage box, reduces the height of the body floor, makes the floor flat, the interior is spacious, and the rear seat position is more Quiet and comfortable, it helps to improve the comfort of passengers.
![Advantages and disadvantages of car driving methods and maintenance[汽车维修知识]](/view/img/nopic.png)
