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Recently, the news of Hubei Shiyan Tongchuang Industry and Trade Co., Ltd. (hereinafter referred to as Tongchuang) producing 1.2 million sets of commercial vehicle dual-clutch automatic transmission (DCT) synchronizer assembly foundation projects has appeared in the headlines of some automobile media. Subsequently, a number of media reprinted. This news attracted the attention of many domestic commercial vehicle companies.
However, after several investigations, it was concluded that the commercial vehicle DCT has not been mass-produced domestically, and there is no manufacturer that can supply in bulk. Professor Chen Huiyan, deputy director of the Department of Vehicle Engineering at Beijing Institute of Technology, studied automobile transmissions for many years. As far as he knows, at least in China, commercial vehicles do not have the DCT installed. The output torque of the DCT is not large. The DCT's maximum output torque that can now be mass-produced is only 300 N·m. It can be installed on a passenger car, but it is mounted on a commercial vehicle and the output torque must be at least 500 N·m. To develop high-power DCT for energy production, breakthroughs must also be made in many basic research fields. Based on summarizing the existing information on various aspects, he speculated that even the well-known automotive transmission system suppliers in the world are using DCT for commercial vehicles only in the stage of trial production or small-scale use. They are used to test vehicles and there are still a few distances from mass production. A not-so-distant way to go.
Song Jian, deputy director of the State Key Laboratory of Automotive Safety and Energy and a professor at the Department of Automotive Engineering at Tsinghua University, said that if commercial vehicles refer to trucks and buses, there are currently no commercial vehicles installed with DCTs or manufacturers of commercial vehicle DCTs. He also believes that there is no need to install DCT for commercial vehicles, and that AMT and AT are used in commercial vehicles and have advantages over DCT.
So, for the 1.2 million commercial vehicle DCT synchronizer referred to in the above message for whom? The reporter was very puzzled and repeatedly contacted Tongchuang, but unfortunately the company’s project manager had no signal. As a result, the reporter turned to consult with some commercial vehicle companies, automatic transmission suppliers, and transmission experts and scholars. The conclusion is that domestic commercial vehicle DCT has not yet entered the production stage, and there are no domestic trucks or buses equipped with DCT. The 1.2 million commercial vehicle DCT synchronizer project appears to be unfounded but contains many possibilities.
As a result, the reporter sought the research and production of commercial vehicle DCT from domestic and foreign well-known automotive transmission suppliers Fast, Wan Liyang, ZF, Allison, BorgWarner and Eaton.
Both Fast and Wan Liyang stated that they have not yet entered the DCT field of commercial vehicles. According to relevant sources of Fast, the company has jointly invested in Caterpillar to produce automatic hydro-mechanical transmissions for commercial vehicles. This is the focus of the future development of Fast.
Jeff Zhang, Vice President of Commercial Vehicles and Special Drive Technologies Division of ZF, stated that ZF has never produced commercial vehicle DCT. There are rumors in the society that ZF is not true for the production of commercial vehicle DCT. He has never heard of it. Which company produces commercial vehicle DCT.
Li Yanjia, Corporate Communications Specialist, Eaton Greater China, told reporters that Eaton currently manufactures DCTs equipped with passenger cars, but has not produced commercial vehicle DCTs for the time being.
Allison is known as an expert in automatic transmissions for commercial vehicles. Chen Jing, general manager of Allison (China) Marketing Department, said that Allison does not produce DCTs for commercial vehicles and it is not clear whether it will be produced in the future.
Sun Shuqiang, marketing manager of BorgWarner, said that BorgWarner has produced passenger car DCTs in China, but has had little involvement in commercial vehicle business. So far no commercial vehicle DCT has been produced.
Judging from the feedback from automotive transmission suppliers, commercial vehicle DCT has not yet been mass-produced in China, which means that there is no commercial vehicle DCT in the domestic market.
The news obtained from the vehicle manufacturer further confirmed the above conclusions. Kang Zhijun, an engineer in the automatic transmission research department of the commercial vehicle department of FAW Group Technology Center, said that FAW did not install a commercial vehicle DCT, and other domestic manufacturers did not estimate it. As for whether or not companies in the world have developed this product, he said he could not be sure.
Zhu Linxuan, vice president of the Shaanxi Automobile Engineering Research Institute, said Shaanxi Automobile is developing a truck equipped with an automatic mechanical transmission (AMT), but no DCT products have been installed.
China National Heavy Duty Truck Group told reporters that the company's trucks installed automatic transmission is mostly exported, but there is no heavy truck installed DCT.
Yutong and Shaolin coach companies also confirmed to reporters that although more and more buses have been installed with automatic transmissions in recent years, DCT products have not yet been installed. According to their understanding, there is no domestic passenger car company that produces DCT-equipped passenger cars.
1.2 million sets of commercial vehicle DCT synchronizer project why production, for whom?
From reports and on-site photos of 1.2 million commercial vehicle DCT synchronizer assembly projects of Tongchuang Co., Ltd. and the company’s staff member Li Xing’s reply to the reporter’s questions, the project does have something to do. The strange thing is that since well-known auto transmission suppliers at home and abroad do not produce DCTs for commercial vehicles, domestic OEMs do not produce products equipped with DCTs. Who then produces the 1.2 million commercial vehicle DCT synchronizers?
According to the analysis of the reporter, the biggest possibility is that an enterprise already has or will soon have the capability to produce commercial vehicle DCT, and plans to put it into production in the near future. It is still in a secrecy period. The DCT synchronizer project that has just started construction is for this purpose. Supplied. Taking into account the need for a synchronizer for each gear of the DCT, the 1.2 million DCT synchronizer can at least meet the demand for the production of 100,000 commercial vehicle DCTs, and such a large production capacity can not help but make people speechless. An insider of Tongchuang, who declined to be named, said that after the completion of the project, it is estimated that it will be delivered to a company of Datong, but it is not yet fully determined. The accuracy of this news is doubtful, but if it is true, the company most likely to produce commercial vehicle DCT in Datong District should be Datong Gear Factory under China National Heavy Duty Truck.
The second possibility is "commercial vehicles" in the "Commercial Vehicle DCT Synchronizer Project". It refers not to trucks and buses, but to commercial vehicles, SUVs, or MPVs. Then, this commercial vehicle DCT synchronizer is actually a passenger car DCT synchronizer. There are many enterprises that produce DCT passenger cars, and 1.2 million sets of synchronizers should not be sold out. Song Jian also believes that commercial vehicles in the narrow sense refer to trucks and buses, and commercial vehicles in the broad sense refer to all vehicles used for commercial purposes and for production materials.
The third possibility is that the news itself is misplaced, such as mistakenly interpreting an ordinary commercial vehicle transmission synchronizer as a DCT synchronizer.
Of course, the above three possibilities are all based on the current reasoning of the reporter. In any case, mass production of DCTs for commercial vehicles is certainly an eye-catching event in the field of commercial vehicles. The newspaper will continue to liaise with the project managers of Tongchuang, and strive to clarify the reasons as soon as possible.
Extensive reading:
Dual Clutch Transmission DCT is different from the general automatic transmission system. It is based on a manual transmission and is not an automatic transmission. Besides having the flexibility of a manual transmission and the comfort of an automatic transmission, it also provides uninterrupted power. Output. The traditional manual transmission uses a clutch. When the gear is shifted, the driver must step on the clutch pedal to make the gears of different gears engage in the meshing action, and the power is interrupted during the gear shift, causing the output performance to be intermittent. .
Synchronizer: As the transmission input shaft and output shaft rotate at their respective speeds, there is a "synchronous" problem when shifting gears. The two gears with different rotational speeds forcibly engaged will inevitably impact and damage the gears. Therefore, the shifting of the old transmission should adopt the “two-leg clutch†method. The upshift should stay in the neutral position for a while, and the downshift should be added to the neutral position to reduce the gear speed difference. However, this operation is complicated and it is difficult to grasp the accuracy. Therefore, the designer created a "synchronizer" and smoothly meshed with the synchronizer to achieve a uniform rotation speed of the gear to be meshed.
The shift operation of the double clutch transmission, especially the shift operation from the high gear to the low gear, is relatively complicated, and it is easy to generate the impact between gear teeth or spline gears. In order to simplify the operation and avoid the interdental impact, a synchronizer may be provided in the shift device.
Why 1.2 million commercial vehicle DCT synchronizer projects are produced and for whom?