Cangzhou Yuchi Auto Parts Co., LTD
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Working principle of gearbox
Release time:
2025-11-03
MT: By disengaging/combining engine power through the clutch, the gear lever operates the synchronizer to engage the gears and change the transmission ratio.
MT: By disengaging/combining engine power through the clutch, the gear lever operates the synchronizer to engage the gears and change the transmission ratio.
AT: The hydraulic torque converter transmits power, and the planetary gear set switches gears through hydraulic control. The computer automatically selects gears based on signals such as vehicle speed and throttle.
CVT: The pulleys change diameter under hydraulic pressure, and the steel strip moves between the pulleys to achieve continuous changes in transmission ratio.
DCT: Two sets of clutches work alternately, with one set transmitting power and the other pre selecting the next gear, switching instantly when shifting gears.
AMT: The electronic control system simulates manual shifting actions and controls the clutch and shifting mechanism.
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The premise of inspection should be accurate： Oil temperature requirement: Most automatic transmissions (AT/DCT/CVT) need to heat the oil to 40 ℃ -60 ℃ (idle for 5-10 minutes without turning off the engine), at which point the oil is at normal working viscosity and the liquid level measurement is most accurate; The manual gearbox can be inspected for cold driving.
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What are the symptoms of insufficient transmission oil in a car?
Transmission oil is the medium for power transmission and gear shifting execution. Insufficient oil can lead to insufficient hydraulic pressure (AT, DCT, CVT) or insufficient lubrication of gear meshing (MT). Manifesting as noticeable stuttering and impact during gear shifting, or requiring a delay of several seconds for power response after shifting, especially during low-speed upshifts.
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How often is the oil in the car gearbox replaced?
There is no unified standard for the replacement cycle of automotive transmission oil, which mainly depends on the type of transmission and the requirements of the vehicle manufacturer, and is also affected by driving conditions.
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Common faults and maintenance points of gearbox
Common faults: gear jerking, oil leakage, abnormal noise, gear failure, often caused by gear wear, aging clutch plates, hydraulic oil deterioration, etc.
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E-mail: yuchi@cntoptransmission.com
Add: Qianxiuluo Village, Xingbieying Township, Hejian City, Cangzhou City, Hebei Province, China
