The role of off-road truck differential lock?
Automatic mechanical lock differential
The basic structure of this type of differential and mechanical lock differential is the same, the difference is that the mechanical lock differential lock and unlock, completely by the driver manual control; automatic mechanical lock differential It is locked and unlocked according to road conditions. Its locking detection mechanism is very sophisticated, there are two detection, one is the difference between the differential gear and the differential shell, and the other is the speed of the differential shell.
Locking conditions: differential housing speed does not exceed the set value (that is, the vehicle speed is lower than the set value), variable gear and differential shell speed difference exceeds the set value (left and right wheel speed difference is too large) If both conditions are met, the differential lock will be triggered and the normal steering will not cause it to lock. The entire locking process, the wheel idling angle difference of not more than 360 degrees.
Unlock condition: The speed of the differential shell exceeds the set value (the speed exceeds the set value). The torque of the left and right axles is reversed (the vehicle turns on), and any one of them will be unlocked immediately.
Advantages: Highway driving characteristics and open differential exactly the same. The off-road surface, exactly the same as the locked differential, does not twist the axle due to steering, and its locking and unlocking process is completely automatic and does not require human intervention. Reliability is very high.
Disadvantages: lock the noise is relatively large, the structure than the mechanical lock differential complex, each differential can only be applied to a model, not versatile.
Applicability: can directly replace the open differential, the precursor can be used after the drive, there is no applicability of the restrictions.
Electronic differential lock
Electronic differential lock compared with the above, did not change the structure and characteristics of the open differential, but the use of ABS or EBD system to perform unilateral brake sliding wheel action, limiting the speed of the two drive wheels Poor, to ensure that both drive wheels are powered.
Advantages: good security, will not damage the vehicle. Disadvantages: the need for ABS and EBD system, costly; in the harsh off-road environment, the reliability of electronic products as mechanical products; single-wheel drive force, as the lock-type differential.
This type of differential lock, due to cost reasons, generally only applies to high-end cars and high-end SUV.
Locked differential (mechanical lock, electric lock, pneumatic lock)
In order to ensure the vehicle in the complex off-road conditions under the driving performance, through a certain mechanical structure of the differential lock, to achieve the simultaneous rotation of the two axles. Through the planetary gear set analysis, is the planetary gear set of the transmission mechanism to lock, to ensure that between the planet carrier and the sun wheel, and the transmission between the two sun wheels are 1: 1. You can lock the sun wheel and planetary planes, you can put the planet carrier and planetary gear lock, you can also lock the two sun wheels.
Locked differential, in the absence of locking, the drive characteristics and open differential exactly the same, in the case of locking, the transmission ratio is fixed to 1: 1.
The advantage of this differential is self-evident, providing the greatest driving force on off-road pavement. The disadvantage is that the steering of the vehicle is extremely difficult when the differential is locked; there is a possibility that the bicycle will be 100% , The axle will be deformed or broken because of excessive torque; the vehicle in the process of steering, the two half of the bearing by the opposite torque, if the adhesion of both sides of the tire are large, will cut the axle. In addition, this differential, in the vehicle during the implementation of the lock action will produce relatively large noise.
The locking differential has all the structure and characteristics of the open differential. In the case of unlocking, the application range is the same as that of the open differential. In the case of locking, it is only suitable for low speed travel Pavement, can not travel on the pavement, otherwise it will lead to vehicle damage and steering out of control.
This type of differential is represented by ARB's pneumatic locking product and Eaton's electric locking product.
