| Automatic Transmission (AT) is a sign of the new automobile technology, and it has a lot of merits that other transmissions don't have. This thesis expounds the design of the hydraulic automatic transmission system for TN518 tractors because there isn't homemade serial tractor-model with AT in china at this time, It is significant that our country realize the domesticization of tractor with AT. The design consists of the matching of torque converter and engine, AT design, chassis assignment, etc. The AT will improve the tractor's stability, power, overpass, economy and operating life, etc., consequently improves the whole performance of it.The AT improves the performance and synthetic techno-economy of tractor. This thesis has important theory meaning and practice basis to the research and development of hydraulic AT system for vehicles, and offer good reference for the popularization of AT in various vehicles. |
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