It is reported that gear pump coupling transmission industry belongs to the construction machinery parts industry, roughly divided into gear transmission, hydraulic transmission and hydrostatic transmission three categories. Next, Xiaobian focuses on the development trend of gear pump coupling gear, and gear pump coupling transmission as an example, describes the application of the situation. Analysis Gear Pump Coupling Transmission Industry Status and Development Situation 1, the classification of mechanical industrial transmission machinery Industrial transmission industry belongs to the construction machinery parts industry, mechanical industrial transmission can be divided into three categories: (1) gear transmission Mainly used in less demanding, the main part of the lower cost of shovel transport machinery, construction cranes, compaction machinery and internal combustion forklifts and other products of the transmission, drive the main drive and the wheel reducer gear transmission according to its structure Forms can be divided into fixed-axis and planetary types. The drive axle can be divided according to their function is rigid, steering and through drive axle. (2) The hydrodynamic transmission is mainly used for products such as shovel transport machinery and internal combustion forklifts with high requirements on the use and performance of the main engine. The torque converter and the power shift transmission are used as the continuously variable transmission components in the chassis power transmission , Can make the host have good automatic adaptability and operation performance. (3) Hydrostatic transmission is mainly used in hydraulic excavators and bulldozers, loaders, road machinery, road rollers and internal combustion forklifts and other products and hydrostatic variable speed, steering system and work equipment which require high performance of the host machine, so that the host machine has Good CVT and operating performance. 2, the current development trend of mechanical gear transmission (1) Due to the low level of mechanical gear transmission technology, has a larger space for development. We should vigorously promote the optimization of design methods and improve the materials and workmanship of the key parts such as gears, shafts and housings to further improve the service life, reduce the weight and reduce the volume. We should try our best to reduce driver's labor by adopting advanced gear shifting components and gear shifting methods Strength, shorten the power interruption time, improve the working efficiency of construction machinery. The advanced design and parts and components of the transmission that have been introduced in China should be vigorously popularized and adopted. (2) Because the torque converter and the power shift transmission make the shovel transport machinery have certain automatic adaptability, light and smooth shifting, good acceleration performance and the like, the production cost is relatively moderate, which has been accepted by most domestic manufacturers . However, due to the current domestic large and medium-sized tire-type construction machinery, many also use large torque ratio hydraulic transducer and two-speed transmission, the use of manual shift mode, so the operating efficiency and economic efficiency significantly lower. It is understood that in order to improve working conditions and improve operating rate, the domestic also introduced the United States CAT D6D, D7G and other single-stage hydraulic torque converter and the German ZF WG series shift shift gear and other advanced technology, to facilitate effective increase The efficiency and economical efficiency of construction machinery operation reduce the heat of the system and make it popularize and apply in the domestic construction machinery, and then replace the manual control system with electro-hydraulic control and electronic control system. Undeniably, one of the key issues in raising the level of hydromechanical transmission in China is to speed up the pace of joint mergers and acquisitions, introduce advanced technologies and build a professional competitiveness in the country with world-class technical standards as early as possible. Only in this way, In order to achieve the professional hydraulic machinery products, serialization and universalization, so that the series of products with strong vitality. (3) The popularization and application of self-locking anti-slip differential and wet brake in the driving axle of tire type construction machinery is one of the ways to improve the technical level of the drive axle products of construction machinery in our country. Self-locking slip differential can automatically achieve the unequal distribution of torque between the left and right wheels to take full advantage of the vehicle traction, but also can significantly improve the off-road performance and economy of the vehicle; wet brake with high durability and reliability Its service life is more than 1.5 times higher than the dry type caliper brake, and the braking capacity is large, the braking performance is good. In foreign large and medium-sized tire construction machinery has been widely used, it should be vigorously promoted. (4) Single-power flow steering clutches and brakes are commonly used in the rear axle of crawler-type construction machinery so that the vehicle turns to the left and right with only one turning radius of R = B, and the rest of the turning radius is achieved by means of slipping of friction elements. Resulting in a serious power loss, but also reduce the service life of friction components. In order to improve the steering performance and reduce the power loss, we should speed up the research and development of the power differential steering mechanism similar to the D8N track-type bulldozer of the U.S. CAT company in our country. Most of the engine power is transmitted to the central main transmission through the transmission system. The other part of the power is transmitted to the hydraulic pump-motor to the ring gear of the first planet row. Design power differential steering mechanism should ensure that: â‘ When the motor speed is not equal to zero, the left and right output speed equal to ensure that the bulldozer has a good linear driving performance. â‘¡ When the central main drive speed is equal to zero, turn the hydraulic motor so that the left and right output speed equal but opposite phase, then bulldozers around the center to achieve situ steering, that is, R = B / 2. â‘¢ As the hydraulic motor can be continuously variable speed and double and rotate, to achieve about the output speed difference stepless precise control, the bulldozer turning radius can be steplessly adjusted, and steering steady, improved steering performance, achieving no power loss. 3, the application of hydrostatic transmission Hydrostatic transmission with a continuously variable speed, wide speed range, constant torque or constant power speed can be achieved, easy to achieve the advantages of electronic control, the construction machinery has a good prospect. However, as the main transmission in shovel transport machinery and hoisting machinery, it is rarely used. The main problem is that the quality of domestic hydraulic components is poor, while that of foreign hydraulic components is too high, which will result in excessive cost of ownership. Since the 1990s, the domestic company has introduced the German Linde Hydrostatic forklift, as well as Liebherr hydrostatic bulldozer loaders, but the share of the domestic market is small. Based on the actual situation of domestic construction machinery market, this paper presents some suggestions on the popularization and application of hydrostatic transmission in China. (1) Hydrostatic transmission forklifts have been widely adopted in developed countries. Due to some domestic warehouses, terminals and factories The use of departments on the mobility of forklift (especially low speed performance), the noise has higher requirements, so these departments are becoming domestic hydrostatic forklift users. Domestic forklift and hydraulic components manufacturers should see the good prospect of hydrostatic forklift, joint research and development of forklift hydrostatic system suitable for China's national conditions, to provide advanced performance, reliable, affordable products. Can also be used with the international hydrostatic components manufacturing company jointly developed way to speed up the development speed. (2) Small and medium-sized multi-purpose construction machinery has been widely used in developed countries due to its multi-functions such as digging, loading, forklift and lifting. As China's economic construction, especially the development of urban construction, small and medium-sized multi-purpose construction machinery will also be popularized and applied in our country, and they will undoubtedly adopt the hydrostatic transmission as its main transmission at first. Domestic construction machinery enterprises should see the prospect of small and medium-sized multi-purpose construction machinery. Hydrostatic components manufacturing enterprises both at home and abroad jointly carry out their research and development to promote the development of small and medium-sized multi-purpose construction machinery in our country. (3) In the domestic large-scale shovel transportation and lifting machinery, due to the technical difficulty of supporting hydrostatic and electronic control components, the price is too high, which is unacceptable to domestic users. Therefore, in our country, we should not focus on the research and development of hydrostatic transmission for the time being with the support of large shoveling and lifting machinery, but should focus on the above two types of construction machinery. (Editor: Shuangling) Further reading: 2016 Xiamen Industry Fair 2016 Beijing Petroleum Exhibition Pumps Valves Pipe Fittings Exhibition Information 2016 Exhibition Information 2016 China World Expo
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