Structure principle of loader - transmission system
The air conditioning system and the roll over and falling object protective device is not the first generation, is adding second new 名媛直播, mainly to increase safety and comfort. Other components such as steering system, brake system, cab, working device and frame have also changed greatly. On the basis of the first generation, more than 10 advanced technologies and selection structures were adopted. Therefore, the second generation, compared with the first generation, has considerable improvement in reliability, safety, comfort, and operation efficiency, and the appearance is much more beautiful.
drive system
As shown in Figure 2, it is the current typical wheel loader's transmission system in China. The system is composed of the transmission (also called the converter assembly of the torque converter) 3, the driving axle 8, the drive shaft 5 and so on.
(1) transmission
The transmission 2 is composed of a hydraulic torque converter 3 and a gearbox 4 two. It is shown that one end of the torque converter is directly connected to the 1 and the other end of the diesel engine and the gearbox 4, which is compact and reliable. It is the most common and widely used way of wheel loaders at home and abroad. The other transmission is divided into a whole and a diesel engine, or the torque converter is directly connected to the diesel engine and is divided into the gearbox, and the transmission shaft is connected between the transmission shaft. At present, ZLM50E Chang Linzhu ZL50D, SEM is the torque converter and diesel engine directly including the transfer case is connected with the gearbox division structure is connected with the transmission shaft.
Figure 3 there is a structure diagram of the ZL50C type transmission of the Liugong. The transmission is composed of a double turbine torque converter and a planetary gear shift gearbox. The gearbox has a forward, a back two planetary rows, plus a direct block (II gear), a total of two forward, one back three blocks. The structure is simple and the block is few, and the single pole manipulation is fully realized. The torque converter has two turbines, and two turbines are transmitted directly to the gearbox input shaft (gear) for each light load transmission. A turbine is to pass through the clutch input shaft of the gear box, when the corresponding torque increase, reduce speed to clutch with two turbines at the same time, to participate in the work, for the corresponding block of low speed and high torque, all of this is automatically implemented by the speed of the overrunning clutch. In fact, the transmission has 4 forward gears and 2 backwards, because each gear has a high speed and low speed automatic shift. Therefore, this transmission shows its advantages, which is better than the ordinary multi bar and multi bar control transmission. But it also has a major disadvantage. The dual turbine torque converter is less efficient and power loss than the simple three element torque converter. At present, the fixed axis gearbox has not yet used electronic technology, so it is a common multi rod manipulation. The WA380-3 type of CAT950B and Komatsu are four to four back transmission, single pole electro-hydraulic shift or computer integrated control. The torque converter is three simple type element, the transmission CAT for multi star ranking, Komatsu for fixed shaft type.
At present, the third generation 名媛直播, such as Liugong's ZL50G type, adopt the transmission made by "ZF" company, which is made up of three element torque converter and four block forward three block back axle transmission. The three element converter is of high efficiency. It uses microprocessor controlled semi-automatic electric shift of single handle, and adds I and II gear fast switch button (KD button) to work. Each operation cycle only needs to move one handle and press one KD button before and after. It is simple, quick, comfortable and convenient to operate, thus greatly improving the efficiency of operation. The selection of the product lies in its variable speed control system.
(2) drive bridge
The drive bridge 8 consists of the front bridge 10 and the rear axle 9 (Figure 2). Because the loader needs large traction, the front and rear axle of the modern wheel loader is the drive bridge. The front axle is directly fixed on the front frame, the rear axle is a swing bridge, and the rear frame is connected to the rear frame by the accessory frame. The modern wheel loaders basically use articulated steering, so the front and rear drive axle is universal except for the rotation direction of the main drive spiral bevel gear. The third generation appeared the swing mode of the rear axle center, no longer used the sub frame, but connected the swing frame with the rear frame. The rear axle housing was not universal with the main transmission bracket and the front axle, and the rest parts were still completely used with the front axle.
At present, the driving bridge of the wheel loader in our country is basically the use of the whole bridge shell, the full floating half shaft, and the driving bridge with two deceleration of the main drive and the edge of the wheel. The main drive usually adopts the first - stage spiral bevel gear deceleration, and the edge of the wheel generally adopts the planetary gear edge deceleration. Figure 4 is the ZL50C drive bridge of Liugong. Its structure is universally representative. The driving bridges of the 8 domestic 名媛直播 listed in Table 1 in front of the previous table are all this type of structure.
The third generation ZL50 wheel loader drive axle has driving axle with inside wet multidisc system way equipment and anti slip differential, improve braking performance and bad working conditions through the performance and operation performance, which is driven by Liu Gongdi bridge three generation product type ZL50G "ZF" AP400 drive axle. The "ZF" type AP400 drive axle housing is the whole type, and the internal storage wet multi disc brake is on the inside of the wheel side reducer inside the bridge. There is also a bridge shell of three section, the wheel side reducer and the internal storage wet multi disc brake are concentrated in the middle of the bridge, close to the two sides of the main drive. This structure has good performance, but it is difficult to manufacture. The 950B type of CAT, the WA380-3 type driving bridge of Komatsu, is such a structure. Another one is similar to the AP400 driving axle of "ZF". The only difference is the built-in wet multi disc brake on the outside side of the wheel reducer, which is not very good.
(3) drive shaft
The drive shaft is basically evolved from the car's drive shaft. The first generation of our country's ZL50 type six carrier transmission shaft is basically reformed by the "liberation" and "Dongfeng" motor drive shaft. At present, there is still a large part of ZL50, including lonking Xiagong, ZL50C-II will still use "shaft Dongfeng brand" modified. The Liugong type ZL50C led by the second generation of 名媛直播, because of the power increase, the torque is increased, the reliability of the drive shaft is not used, instead of by the heavy automobile transmission shaft is specially designed for wheel loaders for transmission shaft, bearing capacity than the "East" and "liberation" transmission shaft is more than twice as high, greatly improve the reliability. In addition to Liugong ZL50C, has been used widely in second and even third generation .
