混合动力变速器高位轴承风冷散热的研究

Study on Air Cooling Heat Dissipation of High Position Bearing in Hybrid Transmission

基于混合动力变速器壳体的设计开发,分析了壳体轴承座表面无散热片和有散热片对高位轴承(处于变速器最高位置)散热功率的影响。通过理论计算表明:在车速为15 km/h时,轴承在运转过程中,摩擦力矩产生的最大热功率为104.89 W。壳体轴承座表面无散热片时,壳体与空气散热带走热功率为78.08 W,带走热功率小于产生热功率,不能保证轴承处于规定温度120℃以下热平衡状态工作。通过在轴承孔外围增加散热片,壳体与空气散热带走热功率为115.09 W,带走热功率大于产生热功率,满足散热需求。

Based on the design and development of hybrid transmission shell, the influence of the surface of shell bearing seat without heat sink and with heat sink on heat dissipation power of high position bearing(at the highest position of transmission)was analyzed.The theoretical calculation shows that when the speed is 15 km/h, the maximum thermal power generated by the friction torque is 104.89 W in the running process of the bearing.When there is no heat sink on the surface of the shell bearing seat, the heat dissipation power of the shell and the air is 78.08 W,and the heat dissipation power is less than the heat generation power, so the bearing cannot be guaranteed to work in a state of thermal balance under the specified temperature of 120 ℃.By adding heat sink around the bearing hole, the heat dissipation power of the shell and air is 115.09 W,and the heat dissipation power is greater than the heat generation power, which meets the heat dissipation demand.