Input drum assembly for improving performance of 68RFE transmission, 68RFE transmission, and method

A 68RFE transmission, comprising:

• a transmission housing, a planetary gear set and an input drum assembly, wherein the input drum assembly is a new input drum assembly (200), the new input drum assembly (200) comprises a clutch retainer (12), an underdrive piston (13), clutch plates (14), clutch friction discs (15), an underdrive hold plate (16) and a clutch pressure plate (18);
• and further comprising:
• a piston cap (21), a piston body (27), and bolts (20) for fixedly connecting the piston cap (21) and the piston body (27), wherein the underdrive piston (13), the clutch plates (14), the clutch friction discs (15) and the underdrive hold plate (16) are arranged in the clutch retainer (12),
• wherein the piston cap (21) is provided with a cap body (21-1) attached to an end face of the clutch retainer (12);
• an edge of the cap body (21-1) extends circumferentially to form a lip (21-2) with a certain width and thickness;
• and the lip (21-2) is provided with a plurality of through-holes (21-3) for inserting the bolts (20), and
• wherein the piston body (27) comprises a cylindrical barrel (27-1);
• a plurality of hole slots (27-2) matched with the bolts (20) and the through-holes (21-3) are formed in an end face of one end of the barrel (27-1) close to the piston cap (21);
• a hold plate (27-3) is formed at one end of the barrel (27-1) away from the piston cap (21);
• and the hold plate is provided with a piston body slot (271).

A method for improving performance of a 68RFE transmission, comprising:

• applying a new input drum assembly (200) in the 68RFE transmission, wherein the new input drum assembly (200) comprises a clutch retainer (12), an underdrive piston (13), clutch plates (14), clutch friction discs (15), an underdrive hold plate (16) and a clutch pressure plate (18);
• the new input drum assembly further comprises a piston cap (21), a piston body (27) and bolts (20) for fixedly connecting the piston cap (21) and the piston body (27);
• and the underdrive piston (13), the clutch plates (14), the clutch friction discs (15) and the underdrive hold plate (16) are arranged in the clutch retainer (12);
• replacing a clutch piston (11), an overdrive hold plate (17) and a snap ring (19) with a piston cap (21) and a piston body (27) after the input drum assembly (200) in the 68RFE transmission is disassembled;
• arranging an underdrive piston (13), clutch plates (14), clutch friction discs (15) and an underdrive hold plate (16) in a clutch retainer (12) and mounting between the piston cap (21) and the piston body (27);
• and
• fixedly connecting the piston cap (21) and the piston body (27) by bolts (20),
• wherein a wall of the new transmission housing (300) is provided with a housing oil filling hole (31) for inputting lubricating oil into the transmission housing, and a housing oil outlet hole (32) for outputting the input lubricating oil from the transmission;
• and
• wherein a wall of the transmission housing (300) is provided with a speed detection hole (34) and a second speed detection hole (35);
• and a distance between the second speed detection hole (35) in an axial direction and the planetary gear set is greater than a distance between the speed detection hole (34) and the planetary gear set.