transmission assembly introduce

The function of the gearbox is to: 1. change the transmission ratio to meet the traction needs of different driving conditions; 2. Implement reverse driving; 3. When the engine is started, idling, shifting gears, or stopping for power output, interrupt the power transmission to the drive wheels. The maintenance method for the gearbox is: 1. Regularly replace the gearbox oil; 2. Regularly check the oil level; 3. Avoid sliding in neutral gear; 4. Regularly clean the gearbox; 5. Avoid forcefully shifting gears; 6. Shorten the time it takes to idle and warm up the car. The signs of transmission failure are: 1. During driving, the vehicle shifts gears and experiences shockwaves; 2. Refueling engine idling without accelerating; 3. The oil temperature is too high, emitting a strange odor; 4. Shift time is too long or too short)

Replacement method for gearbox assembly

1. First remove the universal joint screws to separate the universal joints of the transmission and transmission shaft; Remove the clutch cover screws again to separate the transmission and clutch; If it is a remotely operated transmission, separate the control mechanism from the transmission body and finally remove the transmission from the car. 2. Clean the external oil and dirt of the transmission, pay attention to protecting the front and rear axle heads. Unscrew the oil drain plug, drain the lubricating oil in the transmission, and then tighten the oil drain plug. 3. Find a clean and dust-free area, use disassembly tools and copper rods, Start disassembling the transmission. The disassembly sequence is generally: transmission cover, first shaft, second shaft, intermediate shaft, and reverse shaft. 4. When disassembling parts, first check the original direction and position of the parts before disassembling, and if necessary, make a record; The dismantled parts should be arranged neatly in order of disassembly, and if necessary, the parts can be strung together in sequence using wire or iron wire; Gears can be fitted onto the shaft in their original direction and position to prevent installation or omission. All disassembled parts should be cleaned and inspected accordingly, and those that cannot be used anymore should be replaced; Dismantled oil seals and gaskets should generally not be used anymore and should be replaced. Before assembly, all bearings, oil seals, keyways on the shaft, inner holes of the gears, and bearing holes in the transmission case should be coated with gear oil or engine oil, and the paper gasket to be replaced should be soaked in engine oil. The assembly sequence is opposite to the disassembly sequence, that is, the parts to be removed should be installed first, so that all parts are installed in their original positions. During the installation process, the mating parts should be rotated frequently, Pay attention to the direction of the oil seal and there should be no damage. Before installing the transmission cover, check the site for any missing parts, whether there is axial displacement of each shaft and fixed gear, whether the paper pads are intact in all places, and whether each pair of meshing gears is meshing within the full tooth width; Move the sliding gear by hand to see if it can move axially to full tooth width meshing; Rotate the first shaft by hand and try each gear separately. It should be able to rotate flexibly and smoothly without jamming. 9. Install and fix the shift fork onto the corresponding shift fork shaft, and then install the shift fork shaft into the corresponding hole on the transmission cover. When installing the shift fork shaft, pay attention to installing the self-locking mechanism and interlock mechanism into the corresponding hole. The side of the shift fork shaft with three grooves should be aligned with the direction of the self-locking mechanism steel ball, There is a groove on one side of the shift fork shaft that aligns with the interlocking mechanism. After each shift fork shaft is installed in place, it is placed in the neutral position, and the sliding gears in the variable speed transmission mechanism are also placed in the neutral position. The transmission cover is installed on the transmission case. At this time, each shift fork is installed in the corresponding gear groove, and the connecting bolts are installed. Tighten the bolts in the specified order and torque, and use the gear lever to shift into different gears, Check in sequence whether the gear can be smoothly engaged. If it cannot be engaged, gently rotate the first shaft back and forth by hand. If it still cannot be engaged, remove the box cover for inspection

BMW 6 Series introduce

The BMW 6 Series is a car specially designed by BMW Germany for sophisticated drivers. It was introduced in 1976 and discontinued in 1989. During this period, its sales reached 86000 units, making it the most successful box car in BMW's history After a 14 year hiatus, BMW decided to revive the 6 Series and once again enter this large luxury sports car market, showcasing the core concept of the BMW 6 Series in GT racing, combining the advantages of sports cars and luxury RVs The previous models of BMW's sporty two door cars have also perfectly achieved this integration. In terms of exterior design, the 6 Series maintains the typical dynamic style of BMW Coupe, with a long hood, low roof lines, and front and side skirts giving the car a dynamic and elegant posture. To distinguish it from other models, the headlights, engine cover, radiator grille, and front air vents have all been redesigned. By introducing new elements such as LED brake lights in the tail light design, in addition to greatly reducing reaction time, the size and brightness can be adjusted according to different environments. The BMW v8 engine provides power for the 6 Series. BMW is known for its advanced technological development, and a series of LED brake lights have been introduced. The application of high-tech projects has maintained BMW's leading position in the automotive industry. The 6 Series has also adopted many advanced scientific research achievements. The new 6 Series has a body length of 4820mm and a width of 1800mm, which is even wider than the 5 Series. Such a large body shape will inevitably increase the weight of the body, and excessive body weight will greatly affect the acceleration and handling of the 6 Series. Therefore, BMW has used a large amount of aluminum alloy and composite materials on the body of the 6 Series, In order to achieve the goal of reducing weight, carbon fiber reinforced plastic materials are 50% lighter than steel and 35% lighter than aluminum, which can effectively reduce the weight of the vehicle body. The rigidity is three times that of other materials in the central control area (10 sheets), and the collision resistance and safety are quite good, which has always been an ideal material for the automotive industry. However, due to the lack of stamping equipment, carbon fiber used to be produced manually. BMW has developed a set of stamping equipment with a self weight of 200 tons and a pressure of 1800 tons, which is the world's first mass-produced carbon fiber roof, and has begun trial use on the new 6 series. The 6 series also uses an overhead display (hud) system that is only available on aircraft, which can directly display some important information. Projected onto the windshield of the car, including navigation direction, speed, and active cruise control display. The core functions related to driving in the car are operated through the i-drive controller and buttons attached to the steering wheel, but the i-drive control button is placed on the right side of the gear lever and requires arm extension to reach. Other secondary functions and comfort equipment control are arranged in a distance that is easily accessible to the other (2) cars and front seat passengers, Very convenient. Users can also choose a panoramic glass roof that is much larger than a regular electric sunroof, allowing more sunlight to enter the luxurious interior of the car. Dynamic driving and active steering systems are optional equipment for the 6 Series, which can greatly eliminate the body roll caused by vehicle turning and increase the comfort of passengers inside the car. The active steering system, on the other hand, changes the steering ratio based on the vehicle speed through a stepper motor. At lower speeds, the steering sensitivity increases, and larger wheel turns can be achieved by turning the steering wheel at a smaller angle. This situation is very useful for drivers driving on urban roads or parking and turning around. As the speed increases, the steering becomes more sensitive. Accurate, ensuring driving stability and comfort. The BMW 6 Series engine is equipped with Dynamic Stability Control (DSC) and Dynamic Traction Control (DTC) systems. In addition, the Driving Dynamics Control (DDC) technology used in the BMW M3 and M5 models is also used in the new 6 Series, which is controlled through a "SPORT" button located on the center console The DDC function can increase the sensitivity of the throttle response, improve acceleration ability, and provide a more direct response to the power assisted steering mechanism, thereby increasing the driving pleasure of the driver. In terms of power, there is also the option to choose a sequential manual transmission (SMG), which can be changed by the paddles on the steering wheel or the gear lever. As for the interior, we have always trusted BMW. The 6 Series adheres to BMW's consistent style, perfectly combining luxury and practicality. The bright colors are more in line with its sporty characteristics, and there are multiple configurations to choose from. As a representative of luxury cars, the BMW 6 Series [2] also has many commendable features. In terms of sound configuration, the new BMW 6 Series is equipped with 8 features. A hi fi sound system with speakers, 9 space seats, and 6 CDs create a home theater effect