产品概述：

    东风4B型客运机车是交一直流电力传动内燃机车。机车可满足气温在-40℃～40℃、长大隧道、多风砂地区等条件下的运用要求。机车车体为框架式承载，设置双司机室；采用两台可互换的三轴、无心盘轴箱拉杆式转向架，牵引力及制动力的传递采用低位牵引杆机构；制动机型号为JZ-7型。

主要技术参数：

                                      标称功率（kW）                                                1985kW

                                      轴式                                                           Co－Co

                                      轮径（mm）                                                     1050

                                      轴重（t）                                                      23±3％

                                      机车整备重量（t）                                              138±3％

                                      燃油箱容积（L）                                                9000

                                      机油储备量（kg）                                               1200

                                      冷却水储备量（kg）                                             1200

                                      砂储备量（kg）                                                 800

                                      通过最小曲线半径（m）                                          145

                                      电阻制动功率（kW）                                             ≥2490kW

                                      牵引齿轮传动比                                                 71:21

                                      最大运用速度（km/h）                                            120

                                      持续速度（km/h）                                                29.3

                                      最大起动牵引力（kN ）                                           345

                                      持续牵引力（kN ）                                               230

                                      机车外形尺寸（长×宽×高）（mm）                                21100×3309×4755