深度解读麦格纳7DCT300技术

• 高成熟度：

7DCT300 launched from 2015, until now, volume in market more than 1 million.自2015年量产以来， 7DCT300市场保有量已达百万级。

7DCT300 applied on lots of vehicle model. Such as premium brand BMW, Daimler.7DCT300在国内外匹配众多车型，并有奔驰、宝马等高端品牌。

• 高性能

7DCT300 has good performance for drivability, NVH and reliability.7DCT300在驾驶性能、NVH和可靠性方面都有着较佳的表现。

• 高效

Good fuel consumption 低油耗

High Efficiency(Comprehensive efficiency up to 97%) 极高的传递效率（综合效率高达97%）

• 高能量密度比
  

Best Power-Density 同级别最佳重量扭矩比

• 高质量

1. Max. input torque 300 Nm 最大输入扭矩300Nm

2. Dry weight 67 kg (w/o DMF) 净重67千克（不含双质量飞轮）

3. Wet nested dual clutch 湿式嵌套双离合器

4. 7-speed + R with a gear ratio span of >8.5 possible 7个前进档和1个倒档，速比范围有可能大于8.5

5. Mechanical or Electric park lock 可选机械或电子驻车机构

6. Electro mechanical gear actuation 电子机械式换档执行系统

7. Electro hydraulic clutch actuation 电子液压离合器执行系统

8. Electrical on-demand cooling 适时电子冷却系统

1. Stand-alone TCU mounted to transmission housing TCU安装于变速器壳体上

2. External wiring harness mounted on transmission 线束安装在变速器外部

3. 5 power stages for BLDC motors (shift/clutch/cooling) 5个功率驱动的无刷直流电机（换档/离合器/冷却）

4. 2 pressure sensors 2个压力传感器

5. 1 oil temperature sensor 1 个油温传感器

6. 2 speed sensor (1 with direction) 2个速度传感器（其中一个包含方向）

7. Transmission range sensor(no need for PBW) 变速箱档位位置传感器(电子驻车不需要)

Electric Power Consumption in NEDC: 在NEDC工况下的能耗

• shift actuation is 1-2 W 换挡驱动能耗1-2 W

• clutch actuation is 10-15 W (depending on combustion engine torque) 离合器驱动能耗10-15 W （取决

• 于发动机扭矩）

• clutch cooling is 3-4 W 离合器冷能耗是3-4 W

• base TCU is 10 W 基础TCU能耗是10W

• total is 24-31 W 总能耗是24-31 W

 Maximum engine speed 7500 rpm 最大引擎转速达7500rpm

 Friction surfaces C1=6 / C2=8 摩擦表面C1=6 / C2=8

 Torque capacity 300 Nm ~10bar 扭矩容量300 Nm ~10bar

 Similar clutch gain of 34 Nm/bar for both clutches 两个离合器的传递扭矩/压力比类似，即34 Nm/bar

 Stroke point of 1,5 bar 半接合点压力1.5 bar

 Weight 7,0 kg(with clutch support) 重7.0千克（含离合器支撑）

液压原理图

 Additional cooling system to increase thermal capacity 额外的冷却系统以提高热容量

 The integrated cooler is a water to housing cooler 集成冷却器原理是通过水流过壳体来制冷

 Engine cooling fluid is used within clutch housing 使用发动机冷却液来冷却

 Cooling power of ~150 W / K 冷却能力达到150 W / K

六、齿轮组

 Center distance中心距: 5 4 R

- 188 mm

- 197 mm (better for 4WD更好匹配四驱)

 Gear ratio span of > 8.5 possible 齿轮速比范围有可能大于8.5

- Shortest 1st gear: 18.5

最大一档速比：18.5

- Longest 7th gear: 1.87

最小七档速比: 1.87

 Max. output torque 4200 Nm 最大输出扭矩4200Nm

Odd and even gears are controlled by two shift drums respectively 奇偶档位分别由两个换档鼓控制

Two e-motors control two shift drums respectively 两个电机分别控制两个换档鼓

Double-cone rings for 1st and Rev gear 一档和倒档为双锥

Single-cone rings for all other gears 其它档为单锥

Carbon-lining for all cone rings 所有同步环为碳衬