针对矿用车辆在使用过程中出现的传动件损坏及溜车问题，对整车传动系统及制动系统的原理及组成进行了分析，并对车辆的使用状况进行了调研。为避免传动件损坏及溜车问题的再次发生，研制了一种减压装置，对液压制动系统的压力进行减压，进而实现制动过程中动力换挡变速箱动力的切断功能，减小制动过程中传动件的受力；并采用两位三通液控换向阀使发动机在熄火状态下整车能够自动实现制动功能。使用结果表明：采用减压装置后有效地减少了传动轴、变速箱离合器摩擦片等传动件的磨损，使用两位三通液控换向阀后整车从未发生过溜车现象。通过采取这些措施，可提高矿用车辆运行的可靠性和安全性。%For the problems of the transmission parts damage and sliding accident in using the mine vehicle,the principle and composition of the vehicle transmission system and the brake system were analyzed,and the behavior in the service of vehi-cles were investigated. In order to avoid from the transmission parts damage and sliding accident again,a pressure-relief device which could relieve the pressure of hydraulic braking system was developed to cut off the power in transmission and to realize the power cutoff in power gearshift gear-box,and then the load of transmission parts were reduced in the braking process. The 2-position 3-way hydraulic operated directional valve was used to realize the automatic braking function in the flameout of the engine. Results showed that:the damage on transmission parts including transmission shaft,transmission clutch friction plate and other parts were reduced effectively by using the pressure-relief device,and sliding accident never happened by adopting 2-position 3-way hydraulic operated directional valve. Through these measures,the safety and reliability in operating the mine ve-hicle were improved.
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