全文总字数：6682字
1. 研究目的与意义（文献综述）
The transmission is a mechanism used to change the speed and torque from the engine. It can change the output shaft and input shaft ratio by fixed or split gear, also known as the gearbox. The transmission consists of a variable speed drive and an operating mechanism, and some have a power take-off mechanism. Most of the transmission mechanisms are driven by ordinary gears, and some are driven by planetary gears. Ordinary gear transmission shifting mechanisms generally use a slip gear and a synchronizer. According to the general domestic positioning of the car, the medium-sized car has a wheelbase of between 2.7 meters and 2.9 meters, and the displacement is from 1.8 to 2.5 L, such as Mazda 6, Accord, Mondeo, Sonata, Audi A4, Passat, Toyota Camry. Many models are among the midsize sedan camps.
The model in this design is GAC Toyota Camry, Camry is a model of GAC Toyota. Over the past 35 years, Camry has continued to lead, winning the trust of 20 million owners worldwide, and becoming the king of the world's best cars in the real sense.
The main tasks of the transmission are as follows: 1. Change the transmission ratio, expand the range of variation of the drive wheel and the speed to adapt to the frequently changing form conditions, and at the same time make the engine work under favorable conditions; 2.Under the premise that the engine rotation direction is unchanged, the car can be driven backwards; 3. Use the neutral gear to interrupt the power transmission, so that the engine can start, idle, and facilitate transmission shifting or power output.
2. 研究的基本内容与方案
1 Basic Content
1.Structural selection (structure form analysis and solution selection) of Camry's automotive mechanical transmission.
2.Design and calculation of Camry's automotive mechanical transmission (determination of main parameters of the transmission).
3. 研究计划与安排
| 1-2 (19th-20th week of semester7) | Determine the graduation design topic, improve the graduation design task book (related parameters), school data collection |
| 3（1st week of semester8） | Project conception, literature search, completion of the opening report |
| 4-5(2nd and 3rd week of semester8) | Off-campus internship, off-campus data collection, foreign language translation, data collection |
| 6-8(4th-6th week of semester8) | Design calculation, sketch drawing (March 14 open question defense) |
| 9-11(7th-9th week of semester8) | Drawing drawing, writing design calculation manual (paper), (march 25 mid-term reply) |
| 12-14(10th-12th week of semester8) | Drawing and design calculation manuals, data bag sorting, and defense qualification review |
| 15(13th week of semester8) | The student submits a reply and prepares for the defense; the teacher reviews the drawings and instructions |
4. 参考文献（12篇以上）
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Zhao Dexiang, Qin Rui. Current Status and Development Trend of China's Automobile Transmission[J]. Highway and Motor Transport, 2014
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Han Hailong. Discussion on the scheme design of mechanical transmission for automobiles[J].Machinery Management Development, 2012
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Wu Gang. Application of Modern Design Method for Automotive Mechanical Transmission[J]. Industry and Technology Forum, 2017, 16
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