Take the seven-speed wet dual-clutch transmission, for example. Although the two transmission models are different, the principle is roughly the same. The principle of the double-clutch structure and the internal gear transmission mechanism of the two transmissions is the same. The 1st, 3rd, 5th and 7th gears share the clutch K1, and the 2nd, 4th, 6th and R gears share the clutch K2, and the two clutches are installed in the same drum. The drive plate of the clutch is connected to the engine and is the power input shaft of the transmission. Both clutches K1 and K2 are composed of steel diaphragm, friction plate, inner diaphragm body and outer diaphragm body. The outer diaphragm body of the two clutches and the steel diaphragm are connected together under the action of hydraulic oil; the friction plate is connected with the inner diaphragm body under the action of hydraulic oil. The outer diaphragm bodies of the two clutches are welded with the clutch driving disc, and the inner diaphragms are connected with the transmission input shaft, so that the power can be transmitted to the transmission input shaft.
The hub of the clutch K1 is integrated with the input shaft 1 and is integrated with the 1st, 3rd, 5th and 7th gears on the input shaft 1 . After the clutch K1 works, the input shaft 1 and the 1st, 3rd, 5th and 7th gears on the input shaft rotate.
The hub of the clutch K2 is integrated with the input shaft 2 , and is integrated with the 2nd, 4th, 6th, and R gears on the input shaft 2 . After the clutch K2 works, the input shaft 2 and the 2nd, 4th, 6th and R gears on the shaft rotate.
(1) Working principle of clutch K1
When the oil enters the clutch K1 servo cylinder from the oil inlet of the wet dual-clutch transmission K1, the hydraulic oil pushes the piston of the clutch K1 to press the clutch plate, and the clutch drum is connected to the 1st, 3rd, 5th, and 7th gear clutch hubs. Connect into one, that is, connect the input shaft 1 with the 1st, 3rd, 5th, and 7th gear drive shafts into one, and transmit the engine torque to the drive shaft 1. The 1st, 3rd, 5th and 7th gears on the drive shaft 1 rotate. At this time, the 1st, 3rd, 5th and 7th gears on the output shaft 1 are idling. When a gear needs to be output, the electronically controlled hydraulic mechanism drives the engaging sleeve on the output shaft, and connects the idling gear of the gear with the output shaft to output the corresponding gear.
To sum up, if only the 1st, 3rd, 5th, and 7th gears of the automatic transmission clutch actuator are not working properly, the clutch K1 and its related oil, circuit and related shifting mechanisms should be checked. If only one of the gears is not working properly, focus on checking the shifting mechanism and its related oil and circuits involved in the work of that gear.
(2) Working principle of clutch K2
When the oil enters the clutch K2 servo cylinder from the oil inlet of the clutch K2, the hydraulic oil pushes the piston of the wet dual-clutch transmission K2 to compress the clutch plate, connecting the clutch drum with the 2nd, 4th, 6th and R clutch hubs. Integrate into one, that is, connect the clutch K2 and the input shaft 2 into one, so that the 2nd, 4th, 6th, and R gears on the input shaft 2 rotate. Then the gears on the driving shaft drive the 2nd, 4th, 6th, and R gears on the output shaft 2 which are in constant mesh with them to idle. When the sliding sleeve and the synchronizer connect the idling wheel with the shaft, the output gear on the output shaft is rotated, and the main reducer gear is driven to rotate to realize the output of the corresponding gear.
To sum up, if the wet dual-clutch transmission has only 2nd, 4th, 6th, and R gears, the focus should be on checking the clutch K2 and its related oil, circuit and related shift mechanisms. If only one of the gears is not working properly, focus on checking the shifting mechanism and its related oil and circuits involved in the work of that gear.
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