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1 clutch housing
The clutch housing and the transmission housing adopt a split structure, which focuses on the adaptability of the transmission, that is, through the change of the front end interface of the clutch housing, to realize the need of the transmission to match various types of vehicles and different engines, which will be beneficial to the subsequent zero. The mass production of components and their versatility, and can effectively improve the overall economics of this series of transmissions. However, the split structure increases machining and installation errors relative to the overall structure. In order to ensure the overall performance of the transmission assembly, it is necessary to minimize the influence of such machining and installation errors, so the machining accuracy requirements of the split housing and the transmission housing are relatively high. high.
Whether it is used from the assembly or during the processing of the clutch housing, the first is the flatness of the connection surface with the engine. If the flatness is not good during the machining process, a large positioning error will occur, during the measurement process ( Using a three-coordinate measuring machine) will produce measurement errors during the establishment of the reference process; (with the gage) there is a problem that the measurement datum and the positioning datum are not uniform, the measurement datum and the positioning datum are unified, and the misjudgment of the part pass or fail may occur. . Followed by pin hole processing, how to ensure position accuracy is the key to this process.
The manufacturing of the product can adopt several process schemes. The parts processing can also adopt different equipments, different processing methods and different technological schemes. In addition to technically meeting different requirements, there are different economic effects. Select the process plan, and under the premise of ensuring the quality of the product, it is necessary to analyze and compare various programs economically. In choosing a solution, it is necessary to conduct a technical and economic analysis of various programs, comprehensively compare technical and economic indicators, and select an optimal solution. The optimal process plan should be to complete the assembly or processing of the product or part with faster time and less labor consumption while ensuring the quality of the product. Therefore, high efficiency, good quality and low cost are important criteria for measuring the quality of the process.
2 rear body components
The rear body of the automotive transmission is an important part of the modular design of the transmission. It not only has a good supporting effect on the output shaft of the transmission, but also ensures the normal output of the transmission. It also takes into account the sealability, lubricity and noise of the transmission assembly. , odometer output and other requirements, and in many cases it is the carrier of the transmission's operating mechanism (especially the floor-mounted direct-operated transmission), so its structure is quite complex and diverse, and usually it gradually The contracted tubular structure has a relatively long longitudinal dimension, so that a small lumen space is disadvantageous for processing. In particular, the transmission of the three-support structure has bearings installed in the rear body, and these bearings are over-positioned support for the output shaft and the intermediate shaft of the transmission. Therefore, if the position deviation of the rear bearing hole is large, not only the installation of the corresponding shaft will be caused. Difficulties will also directly affect the gear engagement and the sealing effect of the oil seal at the rear end of the output shaft. This invisibly increases the difficulty of the processing of the rear body, and also puts high demands on the design of the process plan.
3 Manipulating the cover parts
Manipulating the cover parts is the connection hub between the internal control parts of the transmission and the vehicle control system. Usually, the driver's manipulation action is transmitted to the box through the selection and shift lever mounted thereon to realize the control of the vehicle gear position and speed. Moreover, in order to prevent the lubricating oil from leaking from the upper selection and the shifting shaft hole, a position for installing the oil seal is also provided thereon. For some long-distance cable-operated transmissions, the general five-reverse interlocking mechanism is also mounted on the operating cover. The structure of the control cover is complicated and difficult to process. In particular, some transmissions are equipped with different models, and the left and right interchange of the control system is required, which makes the structure of the control cover more complicated.
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