The invention discloses a pneumatic gear shifting
control system assembly for an auxiliary box of a multi-
gear transmission, and belongs to the technical field of automobile transmissions. The problem that at present, when main and auxiliary box
interlocking and post-gear-shifting neutral prevention are achieved through a high and low gear pneumatic gear shifting
system of an auxiliary box of a domestic double-intermediate-shaft multi-
gear transmission by means of a mechanical structure, because a certain period of time is needed in the pneumatic gear shifting
gas pressure establishing and pneumatic driving process, the mechanical structure and a pneumatic element frequently
impact on each other during use and wear is caused is solved. According to the pneumatic gear shifting
control system assembly, a gas inlet of a
reversing valve is connected with a gas source filter pressure reducing valve all the time, it is ensured that gas exits in a high-gear gas outlet or a low-gear gas outlet of the
reversing valve all the time, and therefore gas exists on the high-gear and / or low-gear side of a gear shifting cylinder all the time and the aim of post-gear-shifting neutral prevention is achieved. In addition, a
check valve in the pneumatic gear shifting
control system assembly is arranged between a gas source and a gear shifting switch, the
check valve is controlled to be opened and closed through a
check valve electric shock thumbing head which is connected with a main box gear shifting mechanism, the check valve cannot be opened until a main box is at the neutral gear, and
interlocking of the main box and the auxiliary box is achieved.