一、7DCT300 产品优势
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
GJT DCT300 transmission has been SOP customers: GWM\Brilliance\CTCS DCT300变速箱已投产客户：长城&华晨&CTCS
- Main models involved: H6 & H2 & H2S & V7 主要涉及车型：H6 & H2 & H2S & V7
- Initial SOP time December 2016 内部投产时间2016年12月
- Current market holding amount: 518,000 units 目前市场保有量：518000台
- 市场表现如下：
二、7DCT300产品详细描述
Max. input torque 300 Nm 最大输入扭矩300NmDry weight 67 kg (w/o DMF) 净重67千克（不含双质量飞轮）Wet nested dual clutch 湿式嵌套双离合器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8.5Mechanical or Electric park lock 可选机械或电子驻车机构Electro mechanical gear actuation 电子机械式换档执行系统Electro hydraulic clutch actuation 电子液压离合器执行系统Electrical on-demand cooling 适时电子冷却系统
三、电子控制部件
Stand-alone TCU mounted to transmission housing TCU安装于变速器壳体上External wiring harness mounted on transmission 线束安装在变速器外部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）2 pressure sensors 2个压力传感器1 oil temperature sensor 1 个油温传感器2 speed sensor (1 with direction) 2个速度传感器（其中一个包含方向）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 Wclutch 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 Wbase TCU is 10 W 基础TCU能耗是10Wtotal is 24-31 W 总能耗是24-31 W四、离合器硬件
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
五、冷却系统
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
七、换挡系统
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
八、集成式电子驻车
The basic concept idea is a gear train driven by the gear of the shift drum 2 which is then turning the park lock shaft.
基本概念为由换档毂2带动一个齿轮传动，然后带动驻车锁轴。
文章来源：智享新动力
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