Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Tham khảo tài liệu 'advanced vehicle technology episode 1 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Converter Fig. 5.10 Hydraulic control system D reverse gear lock-up is only permitted to be implemented when the transmission is in either third or fourth gear. The advantages of bypassing the power transfer through the circulating fluid and instead transmitting the engine s output directly to the transmission input shaft eliminates drive slippage thereby increasing the power actually propelling the vehicle. Due to this net gain in power output fuel wastage will be reduced. Lock-up clutch description The lock-up clutch consists of a sliding drive plate which performs two functions firstly to provide the friction coupling device and secondly to act as a hydraulic con- 132 Fig. 5.11 a and b Lock-up torque converter trolled piston to energize or de-energize the clutch engagement facings. The lock-up drive plate piston is supported by the turbine hub which is itself mounted on the transmission input shaft. A transmission damper device similar to that used on a conventional clutch drive-plate is incorporated in the lock-up plate to absorb and damp shock impacts when the lock-up clutch engages. Lock-up control The automatic operation of the converter lock-up is controlled by a speed cut valve and a lock-up control valve. The function of these valves is to open and close fluid passages which supply and discharge fluid from the space formed between the torque converter casing and the lockup drive plate piston. Lock-up disengaged Fig. 5.11 a With the vehicle driven in either first or second gear at relatively low speeds low governor pressure permits the speed cut and lock-up control valve return springs to push their respective plunger to the right. Under these conditions pressurized fluid from the torque converter flows into the space separating the lockup plate piston from the turbine. At the same time fluid from the oil pump is conveyed to the space formed between the torque converter s casing and the lock-up plate piston via the lock-up control valve and the central .
