Reverse gear intermediate shaft supporting structure of transmission

A supporting structure for a reverse countershaft of a transmission, comprising a transmission case, a partition wall and a boss, wherein the transmission case is partitioned by the partition wall into a main case and an auxiliary case, the partition wall comprises a first side facing the main case and a second side facing the auxiliary case, a cylindrical body is provided in the main case and protrudes from the first side of the partition wall into the main case, the transmission case, the partition wall and the boss are formed integrally, and the boss is located at a front side, away from the first side of the partition wall, of the cylindrical body;

• a reverse idler gear installation space is provided between the first side of the partition wall and the boss;
• and the partition wall is provided with a stepped hole comprising a second reverse countershaft supporting hole at a front side facing the main case and an auxiliary case countershaft supporting hole at a rear end facing the auxiliary case, and a diameter of the second reverse countershaft supporting hole is smaller than a diameter of the auxiliary case countershaft supporting hole;
• the second reverse countershaft supporting hole is configured to support the reverse countershaft, and the auxiliary case countershaft supporting hole is configured to support an auxiliary case countershaft and install an auxiliary case countershaft front bearing of the auxiliary case countershaft, and the second reverse countershaft supporting hole and the auxiliary case countershaft supporting hole are not concentric;
• and
• a step formed between the second reverse countershaft supporting hole and the auxiliary case countershaft supporting hole is configured to position the auxiliary case countershaft front bearing to further limit the position of the auxiliary case countershaft.