Front shock absorber assembly introduce

Shock absorbers are mainly used to suppress the oscillation and impact from the road surface when the spring rebounds after absorbing vibration. When passing through uneven roads, although the absorbing spring can filter out the vibration of the road surface, the spring itself still has reciprocating motion, and shock absorbers are used to suppress this type of spring jumping. If the shock absorber is too soft, the body will jump up and down, and if the shock absorber is too hard, it will bring too much resistance, Obstructing the normal operation of springs. In the process of modifying the suspension system, hard shock absorbers need to be matched with hard springs, and the hardness of the springs is closely related to the weight of the vehicle. Therefore, heavier vehicles generally use harder shock absorbers. The device connected to the shock-absorbing crankshaft is used to counteract the torsional vibration of the crankshaft (i.e. the phenomenon of the crankshaft twisting due to the impact force of cylinder ignition). In the suspension system, vibration is generated due to the impact of elastic components, To improve the smoothness of car driving, shock absorbers are installed in parallel with elastic components in the suspension system. To attenuate vibration, hydraulic shock absorbers are commonly used in car suspension systems. Their working principle is that when relative motion occurs due to vibration between the frame (or body) and the axle, the piston inside the shock absorber moves up and down, The oil in the shock absorber chamber repeatedly flows into another chamber through different pores. At this time, the friction between the hole wall and the oil and the internal friction between the oil molecules form a damping force on the vibration, converting the vibration energy of the car into oil thermal energy, which is then absorbed and dissipated into the atmosphere by the shock absorber. When the cross-sectional area and other factors of the oil channel remain unchanged, the damping force increases or decreases with the relative motion speed between the frame and the axle (or wheel), And it is related to the viscosity of the oil [1]. Shock absorbers and elastic components bear the task of cushioning and shock absorption. If the damping force is too large, it will cause the suspension elasticity to deteriorate, and even damage the shock absorber connecting parts. Therefore, it is necessary to adjust the contradiction between elastic components and shock absorbers (1) During the compression stroke (when the axle and frame are close to each other), the damping force of the shock absorber is relatively small, in order to fully exert the elastic effect of the elastic element and alleviate the impact. At this time, the elastic element plays the main role (2) During the suspension extension stroke (the axle and frame are far away from each other), the damping force of the shock absorber should be large and quickly absorb shock (3) When the relative speed between the axle (or wheel) and the axle is too high, it is required that the shock absorber can automatically increase the fluid flow rate to maintain the damping force within a certain limit, in order to avoid bearing excessive impact loads. Tubular shock absorbers are widely used in automotive suspension systems, and they can provide shock absorption in both compression and extension strokes, which is called bidirectional shock absorbers. New shock absorbers are also used, It includes inflatable shock absorbers and resistance adjustable shock absorbers)

Fiat CROMA introduce

The new Croma station wagon has a more dynamic and modern exterior design, although only modified from the current model, the effect is indeed immediate. The new car incorporates the design elements of the new generation Fiat, and we can see the shadow of the new Punto and Brava. The engine hood of the new car has clear lines and a strong sense of power. The elongated front headlights are very dynamic, and the horizontal grille has been replaced by a chrome plated mesh. The tail light shade is darker and cooler than the old model, and the new design of the rear bumper is more dynamic. The cabin of the new car has also been decorated, full of Italian style luxury. The seats are made of leather and fabric. The newly designed instrument panel and steering wheel are very elegant. The standard configuration of the new Croma is already very rich, including rain sensors, reverse radar, tire pressure sensors, cruise control system, ABS anti lock braking system, EBD brake force distribution system, ESP body stability control system, front dual airbags, side airbags, air curtains, and knee airbags. In addition, the new car also has a large number of optional configurations, Including DVD audio and video system, navigation and information system with Bluetooth function, high fidelity audio system, etc. The second row seats can be fully folded, and when the passenger seat is folded down, it becomes a small coffee table. The cargo space can be conveniently increased from 500 liters to 1610 liters. Fiat provides five engines for users to choose from for the new Croma, including two gasoline engines and three Multijet turbocharged diesel engines. The entry-level power is a 1.8-liter gasoline engine with a 140 hp output, and the top-level power configuration is a 2.4-liter turbocharged diesel engine with a 200 hp output. The diesel engine comes standard with a six speed automatic transmission, while the gasoline engine comes standard with a five speed manual transmission. 2.2 A gasoline engine can be equipped with a six speed automatic transmission, while a 1.9-liter diesel engine can be equipped with a five speed manual transmission (Kevin Lee)