Before the beginning of the text, first take DQ381-7A as an example to explain the naming of Volkswagen DSG products. The first letter indicates the type of gearbox, D=double clutch transmission, A=planetary gear automatic transmission; the second letter indicates Gearbox installation form, Q=horizontal, L=vertical, the 3rd and 4th figures indicate the maximum torque, 38 means the maximum load-bearing torque is 420Nm; the 5th figure means the product is the generation; the 6th figure means the gear Number of digits; the seventh letter indicates the drive type, A=four-wheel drive, F=front drive.
1, DQ381/DQ380/DQ500/DQ250 inheritance relationship
DQ381（0GC）
DQ The gearbox developed on the basis of DQ380 (0DE) has made some improvements to DQ380 (0DE) to improve transmission efficiency and reduce CO2 emissions. Compared with DQ380, it can save fuel by 9g/km.
DQ380（0DE)
DQ380 (0DE) gearbox is developed based on DQ500 (0DL), which is zero between DQ500 and DQ500 The component common rate reached 70%, as shown in the figure below:
DQ500（0DL)
DQ500 (0DL) is developed on the basis of the dual-clutch gearbox DQ250 (02E) technology, designed for the transmission of high torque and heavy vehicles. First applied to the Volkswagen T5 commercial vehicle, from March 2010, combined with the four-wheel drive 4motion.
Table 1: DQ381/DQ380/DQ500/DQ250 technical data comparison
2, DQ381 main technical features
0d9a0#
DQ381 structure (1)
DQ381 structure (2)
Compared with DQ380, DQ381 mainly made the following improvements:
1) The drive shaft and differential adopt low-friction bearings to reduce friction loss;
2) Use low-friction oil seals to reduce friction loss;
3) Equipped with an electronic oil pump to support shutting down the engine when coasting;
4) Use low-viscosity ATF to reduce the friction loss of the gear pair;
5) Horizontal pressure oil filter;
6) With front drive and four-wheel drive configuration options;
7) uses a smaller gear module, less transmission noise, and higher comfort;
8) upgrades the TCU software version to optimize the safety of control functions.
Fixed bearing
Floating bearing
Transmission oil seal
Oil distribution
Partition
Oil guide plate
Double pump system
In the hydraulic system, an electric auxiliary oil pump connected to the CAN bus can be added, which can realize the following functions through valve adjustment: 1. Support pressure hydraulic circuit, used to compress the clutch and manipulate the shift mechanism; 2. ATF can also be used To the low-pressure circuit, it is used for the lubrication and heat dissipation of shafts, gears and clutches K1\K2; the addition of an electric auxiliary oil pump makes the transmission operation not affected by the engine speed, and the electric oil pump can continue to be a component during start-stop work and coasting mode Fuel supply, and can also improve the responsiveness of clutch re-engagement when the engine restarts.
Electric oil pump V475
The electric auxiliary hydraulic pump V475 is composed of a double center pump and a motor. The pump is powered by a 4-pin plug. Its main function is: in intelligent start and stop conditions Provide ATF for clutch K1 and K2, provide ATF for clutch cooling, provide ATF for hydraulic switching system during coasting, and provide ATF for gear pair and shaft lubrication.
Mechanical oil pump
The mechanical oil pump is driven by gears directly connected to the dual clutch. The main function is to provide ATF for clutches K1 and K2, ATF for clutch cooling, and a hydraulic switching system Provide ATF, provide ATF for gear pair and shaft lubrication.
DQ381-7A four-wheel drive type
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