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specific structure of the steering drive axle
about 2 years ago

With the development of automotive technology and the demand for automotive performance Steering Knuckle at Best Price in china, four-wheel drive systems and front-wheel drive systems have gradually been developed. This requires the front axle of the car to have both steering and driving functions. This kind of axle that can realize the two functions of wheel steering and driving is called steering drive axle (generally referred to as rigid integral bridge). This kind of axle is structurally equipped with the main reducer, differential, half shaft and other parts of the general drive axle, and also has the steering knuckle, steering king pin and wheel hub that the general steering axle has.


The difference is that due to the need for steering, the half shaft is divided into two sections, the inner half shaft (connected to the differential) and the outer half shaft (connected to the wheel hub), and the two are connected by a constant angular velocity universal joint; , The steering king pin is also divided into two upper and lower sections, which are respectively fixed on the ball bearing of the universal joint; the steering knuckle shaft is made hollow, and the outer half shaft passes through it. The connecting fork of the steering knuckle is a spherical shell, which can not only meet the needs of steering, but also adapt to the transmission force of the steering knuckle.


The specific structure of the steering drive axle is as follows:


1. Drive part: There are also main reducer, differential, half shaft and other parts on the steering drive axle. The half shaft is divided into inner and outer sections. The inner half shaft is connected with the differential to receive the power transmitted by the engine; The outer half shaft is connected with the wheel hub through a spline, and transmits power to the wheels to drive the car. The inner and outer half shafts are connected by constant angular velocity universal joints.


The key role here is the constant angular velocity universal joint that connects the inner and outer half shafts. This constant angular velocity universal joint has multiple forms such as double, triple pin, ball fork and ball cage. The double type is two common cross-shaft universal joints connected in series. It is larger in size and can transmit a larger torque. It is generally used on large off-road trucks, such as too pull off. The three-pin type is from The dual type evolved with a more compact structure and is generally used in medium-sized off-road trucks, such as Dongfeng EQ240. The ball fork type is equipped with five steel balls between the active fork and the passive fork to form a flexible The force transmission mechanism is used to transmit power. It is generally used in light off-road vehicles, such as BJ212, etc.; there is also a ball cage type, which is generally used in independent suspension vehicles.

2. Steering part: Since the half shaft needs to pass through the center of the steering knuckle, the steering king pin cannot be made into a whole. It needs to be divided into two upper and lower sections. The steering knuckle housing is connected to the upper king pin and the lower king pin, and can be placed on it. Free to swing from side to side. Then the steering control mechanism controls the deflection of the steering knuckle through the steering knuckle arm, thereby driving the deflection of the wheels, thereby realizing the steering of the car.


It should be noted that the axis of the upper and lower kingpins must be on a straight line, and the connection between the two must coincide with the center of the semi-axle constant angular velocity universal joint to ensure that the front wheel rotation and deflection do not interfere with each other. This is ensured by structural positioning. If the king pin sleeve is loose or the constant angular velocity universal joint is damaged during use, there will be failures such as steering jam, abnormal noise, and wheels not automatically returning to the center.

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