April 19, 2019, sunny,Under the organization of Hunan Machinery Industry Association, the scientific and technological achievements evaluation and new product identification meeting of the above two projects of our company was successfully held on the fifth floor of Hengdong Hengrui International Hotel。Members of the expert group attending the meeting are: Hunan Machinery Industry Association President/researcher He Jianguo, senior engineer Li Yonghong ，Hunan University professor/doctoral supervisor Gong Jinke，Pan Qinglin, Professor/PhD supervisor, Central South University，Dai Yifan, professor/doctoral advisor, National University of Defense Technology，Changsha University of Science and Technology professor Wu Yihu，Hunan Institute of Technology professor Liu Anmin，Hunan internal combustion engine quality supervision and inspection authorized station head/senior engineer Liu Qian Gang，The user representative is Hunan Changfeng power Co., LTD. Qiu Yue engineer。

  DF727The transmission project uses a helical gear transmission structure with the following innovations and features:

  The inner rotor shaft hole and the drive shaft are designed for clearance coordination, and the floating rotor structure with flat key transfers torque.The problem that the axial force produced by the bevel gear causes the inner rotor to wear the pump body off-kilter is solved.The thrust bearing structure is designed between the thrust surface of the drive shaft and the pump body，Offset the axial force generated by the helical gear，Reduce the wear of the motion pair;The triangular unloading groove is designed，Reduce instantaneous peak high pressure，Reduce outlet pressure fluctuation;Adopts die-cast aluminum alloy pump cover and shaft hole without bushing structure，Lightweight design is realized。

 B07Variable displacement oil pump project has the following innovations and features:

 A variable displacement oil pump controlled by switching solenoid valve + control valve is developed，The speed and oil pressure stability are improved，Meet the engine oil pressure requirements;The sealing structure of sliding block and pump body R arc clearance with automatic compensation is designed，Pressure oil is introduced by compensating oil passage to provide support for rectangular seals，It automatically compensates under pressure oil，The problem of decreasing sealing performance caused by aging or wear of rectangular sealing strip is solved.Aluminum alloy + surface hard anodizing treatment to replace the engineering plastic control valve，It has good wear resistance and corrosion resistance，The reliability of the control valve movement is improved。

 The expert group listened to the project report, reviewed the project information, visited the production site, after questioning and discussion, the united opinion: the two results of the technology have reached the international advanced level, agreed to pass the scientific and technological achievements evaluation and new product identification。