When it comes to humanized design, people will think of a comfortable cab, ergonomic seats, steering wheel, gear lever, and so on. These designs greatly enhance our driving comfort, truly a user-friendly design that can be seen and touched. However, in my opinion, these designs are not as user-friendly as another classic design, which can flip the cab over. The cab overturning greatly simplifies the vehicle maintenance process and is one of the classic designs in the truck industry. At present, almost 100% of heavy trucks in the flat cab support flipping function, and even light trucks that rarely had this function before are now increasingly using flipping technology. However, flipping is convenient, but complex flipping mechanisms will inevitably bring some problems. Today, I will introduce some relevant knowledge and techniques of the truck cab steering system. The truck cab itself is relatively heavy, and it cannot be overturned solely by human labor, so a set of power assist devices is needed. From the perspective of working principle, boosters are divided into torsion bar type and hydraulic type. Simply put, the torsion bar relies on one or two elastic iron bars to provide auxiliary power and manually lift the cab.
If you don't know your card friends, you can imagine twisting a towel. The towel will have a certain elasticity after tightening. When you release it, the towel will return to its original state through elasticity. This is the working principle of the torsion bar cab overturning system. When the cab descends to the lowest position, the torsion bar twists, and when lifted, the elastic force is released, providing assistance. The torsion bar cab assisted flipping mechanism has the advantages of simple structure and good reliability, but with continuous use, the elasticity of the torsion bar will become lower and lower. If your cab uses this power assist system and the lifting process is heavy and difficult, you can open the doors on both sides of the cab. After opening, you can easily lift the heavy cab. But this method can cause certain damage to the hinge of the door and can only be used in emergency situations. The elasticity of the torsion bar should be adjusted as soon as possible. The hydraulic overturning system, as the name suggests, is a system that relies on hydraulic power to lift the cab. From the perspective of power source, the hydraulic flip system is also divided into manual and electric. Due to the limited number of times the driver's cab is overturned and sufficient manpower, most heavy trucks now use manual hydraulic overturning systems.
The biggest advantage of hydraulic overturning system is that the lifting force is large enough, and no matter how many cabs are lifted, it can be easily lifted, which is incomparable to torsion bar assisted systems. However, there are also drawbacks such as overly complex structure, higher failure rate than torsion bar type, and higher maintenance requirements. For example, in the northern part of winter, hydraulic lifting systems must use hydraulic oil with lower viscosity, otherwise it will be difficult to lift the cab. If this situation occurs, in addition to replacing the hydraulic oil, hot water can also be used to pour water into the manual pump for emergency use.