The Rover-designed two-speed transfer box shares a common case with the four-speed manual gearbox and has a vacuum-operated centre differential .

Rover设计的双速 转移系统与四速手动 变速 箱一样使用同一个箱子，并有一个真空操作中心的细微差别。

The thermal module of the finite element software ANSYS is used to analyze the heat transfer of the gearbox .

该研究使用ANSYS有限元软件的热分析模块进行 变速 箱热 传导分析计算。

Based on principles of gear engagement hydrodynamics and the theory of heat transfer the flow field in the gearbox with oil-bath lubrication the convective heat transfer and temperature field of gears are studied by numerical simulation method .

基于齿轮啮合原理、流体动力学和 传 热学理论，运用数值仿真方法，研究油浴润滑的 齿轮 箱内部流场、齿轮对流换热及齿轮温度场。