Car timing gear cover action.
Timing gears are introduced in the intake and exhaust systems in internal combustion engines, in clocks and other local systems that have a sequential relationship to complete mechanical functions.
Three transmission modes of timing gear: chain drive, tooth belt drive, gear drive.
The positive and negative gears of the car engine are driven by toothed belt, which has the advantages of simple structure, low noise, smooth operation, high transmission accuracy, good synchronization, etc., but its strength is low, and it is easy to age, stretch deformation or fracture after long-term use. The toothed belt is in a closed state in the outer cover, which is inconvenient to observe its working condition. There is a Mitsubishi car, no start symptoms, after oil, circuit investigation, the fault still exists, and then open the valve chamber cover, found that the valve rocker arm does not work, determined that the timing tooth belt is broken. After the replacement of the new product, the engine still won't start. Because, once the tooth belt is broken in operation, the camshaft stops running, and the crankshaft will continue to rotate a certain Angle or number of turns under the action of the rotation inertia of the flywheel or the inertia of the transmission device. At this time, the engine can not work, and more seriously, the valve phase is destroyed, and the piston will top bend the valve rod in the open position, resulting in the valve being closed loosely. Therefore, some engines with broken toothed belts, even if the timing gear mark is re-corrected, and the new timing toothed belt is replaced, the engine is still not easy to start, or barely able to start, but the work is not normal, and the phenomenon of "tempering", "firing", insufficient power, and increased noise occurs. In this case, only by removing the cylinder head and replacing the valve can the engine technical condition be completely restored. The moment and state of the action of the valve must be consistent with the state and time of the movement of the piston, and the crankshaft and camshaft are not on an axis, they must be connected by a transmission system, the transmission system is completed by two gears and a chain or belt, then the two gears are called timing gear, the two gears are marked, After fitting the chain or belt according to the mark, it can ensure that the moment and action of the valve action are accurate.
The function of the timing gear cover is to protect the timing gear from some dust and water. The role of the timing gear is to position the time scale for the completion of the relevant control functions in the mechanical device.
Timing gear is a gear that plays a time scale positioning for the completion of relevant control functions in a mechanical device. Timing gears are introduced in the intake and exhaust systems in internal combustion engines, in clocks and other local systems that have a sequential relationship to complete mechanical functions.
The role of the timing gear: it can play a time scale positioning role in the completion of the relevant control functions in the mechanical device.
Three transmission modes of timing gear: chain drive, tooth belt drive, gear drive. The positive and negative gears of the car engine are driven by toothed belt, which has the advantages of simple structure, low noise, smooth operation, high transmission accuracy, good synchronization, etc., but its strength is low, easy to aging, tensile deformation or fracture after long-term use, and it is inconvenient to observe its working condition.
The moment and state of the action of the valve must be consistent with the state and moment of the piston movement, and the crankshaft and camshaft are not on an axis, and there must be a transmission system between them to connect, the transmission system is completed by two gears and a chain or belt, then the two gears are called timing gears.
Car engine timing gear failure
When the engine is running, it makes a continuous or rhythmic sound at the front of the engine. Under normal circumstances, the higher the speed, the greater the sound; The sound does not change when the temperature changes; The sound of single cylinder breaking fire does not weaken.
Possible causes of abnormal sound of timing gear
(1) The gap of the gear combination is too large or too small
(2) The center distance between the crankshaft main bearing hole and the camshaft bearing hole changes during use or repair, becoming larger or smaller; The center lines of the crankshaft and camshaft are not parallel, resulting in poor meshing of the gears.
(3) The tooth shape of the gear is not processed, the deformation during heat treatment or the tooth surface is too worn;
(4) The gnawing gap is not tight or root cutting occurs during the gear rotation;
(5) the tooth surface has scars, delamination or tooth fracture;
(6) The gear is loose or out on the crankshaft or camshaft;
(7) gear face circular runout or radial runout is too large;
(8) crankshaft or camshaft axial clearance is too large;
(9) Gears are not replaced in pairs.
(10) After replacing the crankshaft and camshaft bearing bush, the gear meshing position is changed.
(11) camshaft timing gear fixing nut loose.
(12) camshaft timing gear tooth loss, or gear radial rupture.
Timing gear abnormal sound performance characteristics
1) The sound is more complex, sometimes rhythmic, sometimes no rhythm, sometimes intermittent, sometimes continuous.
2) When the engine is idling or the speed changes, there is a messy and slight noise at the cover of the gear chamber at the timing, and the noise disappears after the speed is increased, and the noise appears when the engine is rapidly decelerated.
3) Some sounds are not affected by temperature and single cylinder fire break test, and some are affected by temperature, there is no sound when the temperature is low, and when the temperature rises to normal, the sound appears.
4) Some sounds are accompanied by vibration of the timing gear chamber cover, and some sounds are not accompanied by vibration.
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