Recently , Chengdu Trump Automotive Group Co., Ltd. and Zhejiang Changtai Machinery Co., Ltd. held a Delphi low-carbon transmission listing conference in Hangzhou and was the first to mass-promote 8-speed multi-function transmissions on Chinese and Canadian light trucks .

It is not uncommon to use a new transmission. Why has a low-key trump car organized a press conference for this purpose? "This year's joint promotion with Zhejiang Changtai's Defo Low-carbon Transmission is an innovative product." Zhou Yu, general manager of Ace Motors, highly praised this.

Multi-block box trend

The reason why this is said is that mid- and light-duty trucks have always been troubled by auxiliary transmissions. Medium and light dump trucks are evolved from tractors and agricultural vehicles. The auxiliary speed is a symbolic component.

He Yaohua, Professor of Automotive Research Institute of Wuhan University of Technology, said: "Due to the characteristics of overloading and complicated and changing working conditions, medium and light engineering dump trucks often require auxiliary transmission to increase traction and improve the passage of climbing and pitting. Capacity, but the primary and secondary transmissions are in series, but it is actually a backward product sign."

However, the use of auxiliary gears in the mid- and light-duty dump truck industry for more than 10 years is a deeply rooted historical issue. "Without auxiliary transmission, we do not dare to overload, climbing and other performance is also affected. It is more deadly for the engineering dump truck, and even many users will see if there is any auxiliary transmission."

However, there are many disadvantages of the auxiliary speed. The problems reflected are the lack of engine power, high fuel consumption, and frequent maintenance, resulting in low vehicle attendance and impaired user economic efficiency. “In addition, the auxiliary transmission can only increase one gear and become a 6-block vehicle. It is uneconomical and unreasonable in terms of manufacturing cost. It is a product of a certain period of time and it will inevitably require development and innovation.” said the original Dongfeng Motor Research Institute expert Chen Enting. .

At present, both light, medium and heavy trucks are pursuing much more clothing, running faster and eating less. To solve this problem, it is necessary to use a multi-speed transmission to integrate the two transmissions to realize full synchronization and multi-blocking. This is a practical and feasible technology direction for medium- and light-duty trucks in China for a long time to come.

No "deputy" burden on car purchases

Based on the various limitations of secondary transmissions, Ace Motors has been looking for opportunities to break through the "back box of the main box."

For trumps, the expected multi-speed transmission must have at least three major functions. The first is that the first grade climbing ability is stronger than the auxiliary speed; the second is that there is an overspeed gear, which can meet the needs of the engineering dump truck return empty car run; Third, the operation is better, need synchronizer.

After many investigations, ultimately, Ace Car Group and Zhejiang Changtai Machinery Co., Ltd. jointly carried out strategic cooperation and development, launched a low-carbon defoucal transmission, and decided to take the lead in the domestic light truck field implant 8T50 multi-function low-carbon transmission and vehicle matching .

In this regard, Chen Enting gave a high evaluation: "Defo low-speed transmissions have jumped out of the tradition of using four-speed transmissions and created a precedent for the use of multi-blocks. This requires courage." At present, the newly-matched Defu is low. The carbon transmission has 8 gears and the advantages are obvious. Defu low-speed transmission 1 block speed ratio of about 12, strong climbing ability. It completely replaces the auxiliary speed in function and has a good protection effect on the engine at the same time. At the same time, Defu low-carbon transmissions achieve overspeed gear while meeting the superior climbing ability, thus solving the problem of empty high-speed return. The transmission adopts main and auxiliary integrated structure, compact structure, high precision, and also adopts full synchronization, full helical gear structure, lock ring synchronizer, low noise, light and flexible shifting.

It is commendable that Defu low-carbon transmissions can also reasonably allocate various speed ratios, improve the matching performance with the engine, and make the engine work under optimal conditions and reduce fuel consumption. After testing, it can save 12% to 16% of oil and increase the user's profit margin.

Chen Enting said: “The 8-speed transmission has three major difficulties. First of all, the machining accuracy of the gears is very high. Second, the planetary gears used in the transmission require the positioning of the gears to be very accurate. If they are unevenly grounded, there will be system problems. The heat treatment process of the transmission has a high level of performance and the surface has good wear resistance. Defu's low-carbon transmission is worthy of recognition in these areas."

Competitive advantage is obvious

In addition to the technical advantages, the greater advantage of Defu's low-carbon transmission is its cost.

Heavy-duty multi-speed transmissions have long been popular, with the highest gear reaching 16 stops. There are few attempts on medium- and light-duty vehicles. The main historical difficulty is that the cost of multi-cases will increase significantly, while the sensitivity of users of medium- and light-duty trucks is relatively high. At the same time, the product quality has not been shut, and the reliability of medium and light truck multi-speed transmissions is not high, and users are unwilling to accept them. “We tried to use some brands of multi-speed transmission before, but the main problem is still poor reliability, or the use of synchronizer, the user is easy to hang gear difficult, after the trial, the user is still tend to choose to buy a car with auxiliary transmission.” Zhou Hao said.

The cost of purchasing the Defu low-carbon transmission jointly put forward by both parties is almost the same as the original “back box” of the main box, and some models are even cheaper. And because the reliability is significantly improved, the frequency of failures is reduced, and maintenance and use costs are also reduced.

For the service problems that users are worried about, Ace Car and Zhejiang Changtai have already considered it. Zhejiang Changtai promised that in addition to Xinjiang and Tibet provinces, spare parts will be available within 24 hours. Within two months, problems such as gears, transmission shafts, etc., can be directly replaced with new ones. In general, the use of planetary gear transmission as long as the stability of the first two months of the run-in period, the problem will be less late. Ace Motors and Zhejiang Changtai's confidence in Defu's low-carbon transmissions is evident.

“The company has already tested two dump trucks equipped with Defu low-carbon transmissions. After more than a month of use, users have reported that the transmission has better maneuverability and stability, and its synchronizer and high and low gear changeover technologies allow flexible operation. Convenient; 1 block high torque and overdrive design is closely linked to the needs of users. This transmission completely solves the history of 'deputy' responsibilities, there will be a good market prospects." Ace Sichuan Guangyuan dealer Xie said.

It is understood that Defu low-carbon multi-speed transmission has been applied for the registration of technical patents and trademarks to the relevant departments of the country and has built a firewall for property protection.

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