Principle and Type Analysis of Limited Slip Differential——Type

1. Torsen differential: The so-called Torsen differential is to use worm gear to achieve self-locking, which can work continuously like ordinary differentials, and has no delayed response, and does not interfere with the total torque The adjustment of the output, at this time, there is no loss of torque. Compared with the traction control and body stability control systems, it has a greater advantage in performance and is heavier in weight.

2. Helical gear differential: In fact, the principle is no different from the former, but the helical gear is parallel to the half shaft, and the helical gears are meshed with each other, which means that there will be a certain amount of wear and tear. But it will be slightly lighter in weight.

3. Mechanical differential: It mainly uses two sets of left and right pressure plate groups and clutch plates. The limited slip percentage function can be achieved by the arrangement and combination of clutch plates and pressure plates, and the response speed is very fast, but the difference between the differential oil The fluidity is relatively poor and the heat dissipation performance is not very good, so the durability is not very good.

4. Eaton differential: In fact, this differential is also a mechanical differential, but it is slightly simpler in structure than a mechanical differential. A flyweight is set in the differential housing. When the speed difference reaches When a certain value is reached, the flyweight will be locked, and the wheels on both sides will be connected linearly, so as to achieve the purpose of getting out of trouble.

The difference between Torsen differential and ordinary differential

The Torsen differential achieves slip-limiting by cleverly using a pair of worm gears and a worm gear. Its characteristic is that the driving torque is transmitted from the worm gear to the worm gear, and cannot be transmitted in the reverse direction. It will lock up. It is through this feature that limited slip is achieved. In normal cornering, that is, all tires do not slip, the Torsen differential behaves like a normal differential. The additional worm drive and worm gear do not A speed difference is affected between the output shafts. For example, if the car is turning left, the drive shaft of the right wheel rotates faster than the differential housing, and the drive shaft of the left wheel rotates slower than the differential housing. The speed difference between the left and right worm gears can be exactly matched in a synchronized gear drive . Note that the worm gear and worm drive are not locked because torque is transferred from the worm gear to the worm drive. Assuming that if the right wheel loses its grip and slips, it will have an effect on the worm gear and worm drive. In the moment when there is no effect, it is necessary to know that the ordinary differential principle is that the torque will not be sent to the left wheel that has the ability to grip all. The torque of the worm is sent to the slipping and idling right wheel. In this way, the fast rotating right worm wheel drives its worm drive, which drives the left worm drive through the synchronous gear. Remember the characteristics of the worm/worm drive mentioned earlier? When the worm drive drives the worm gear, they lock up. As a result, the worm drive on the left and the worm drive on the right lock together, so that the left and right wheels rotate at the same speed to restore the car’s grip.

Torsen differential. Costs a lot. However, there are many advantages to using Torsen’s 4WD. First, its purely mechanical differential intervenes almost as soon as the tires slip. Second, its locking is linear. That is, it is strictly a full-time four-wheel drive. Under normal conditions, the torque distribution between the front and rear wheels is 50:50 (other distribution ratios are also possible, depending on the gears of the worm drive). Pros: Fast response, permanent 4WD Cons: High cost, torque distribution cannot be changed.