In the main core element of China construction machinery parts, only the component parts of the domestic transmission system supporting the most perfect market to meet the highest rate, and is also the most relevant intellectual property rights Key Accessories. Components made of one of the core Hydraulic Components From the value of speaking, to meet domestic supporting rate of only 30%, especially high-value variable Hydraulic pressure Components, almost all imported. The transmission components of the core element of domestic component parts to meet the rate of 70% to 75%, and only a few high-end component parts and large-sized drive transmission element components still need to import.
In the gearbox, the world has always been two schools, one is like the ZF of Germany and the United States as the fixed-axis box Dana, and the other as the most currently used in China and Carter, Komatsu and other planetary gearbox used. Planetary gearbox, like our current row only two planets, called planetary simple, manufacturing, maintenance is relatively easier. Another kind of like Jimmy Carter, Komatsu and other complex planetary, manufacturing process more complicated. Both schools have their own advantages and disadvantages, so the two schools have been co-exist in the world. However, the actual situation in China, complex planetary manufacturing more difficult to introduce Carter Sichuan tooth technology, the end product is not formed an example. Old simple planetary gearbox, although still the most widely used, but has some fundamental flaws can not be overcome, the technology is no breakthrough. Therefore, transmission in the entire industry technology develo pment, aimed at the world-class ZF box. Hang both the introduction of ZF gear technology foundation and Liugong ZF joint venture with the technological base and, widespread use, maintenance and basic accessories. Also supporting the punch with its welded torque converter has been developed in Shaanxi Aerospace Power, and has been supporting large quantities. So China is now the new mainstream dual-change technology has been under the direction of the ZF-based development. Main accessories company produced high levels of tooth Hangzhou ZF dual variable in volume into the market through the change from the loader gearbox design has been developed to the rollers, graders and other construction machinery products. Host enterprise Liugong, Long workers, building workers, such as workers, have developed to varying degrees or are developing the series gearbox. And type from the 3t, 5t 6t type to type, has gradually started to form a series of new dual-medium model change system. Th e key technology of the dual variable is microcomputer controlled electro-hydraulic control system. One of the most critical part of the microprocessor core and electro-hydraulic Control Valve. Currently China scored two key core technology has reached the final crucial stage. Once fully capture these core technologies, our generation and updating of technology will soon be double-wide variable to achieve.
The drive axle, the current bridge construction machinery in China the development of new technologies, changes to mature than the new double. At present, China construction machinery drive axle and the main direction of technological development with a differential lock to the bridge direction wet. Wet the basic structure of the bridge there are two types, one is integral axle housing, a bridge is three shell. Integral main drive axle in the middle, and wet brake wheel reducer on both sides. The three bridge, bridge shell is divided into three sections, the middle part is a box-type structure, primary drive, wet brake, wheel reducer all concentrated in the middle part. Which two structures are not an absolute good than the other, or absolutely bad, advantages and disadvantages. Therefore, these two structures will coexist, as a structure with which good, according to their own situation to be. As things stand, the overall style is more suited to our current situation and the manufacturing level. Professional bridges the current one plant every month Fenyi drive axle Limited quantities of wet bridge must provide to the market. Liugong overall wet bridge, into the work of three wet bridge series basically has begun mass production, and exports have begun with the host. Host of other business enterprises and professional support to varying degrees, have launched a wet bridge.
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