In addition to the brake master cylinder, wheel cylinder and brake pipeline, there are also air pump (connected to the engine by belt), air reservoir, high-pressure controller (adjust the pressure, the vehicle can reach 8 atmospheres), relay valve and other components, which need large installation space and complex structure. In order to ensure safety, the rear brake sub cylinder is now AIR-OFF brake (increasing cost and complicated structure).
Therefore, due to these reasons, most of the oil brakes are used in small and medium-sized vehicles, which are small in size, simple in structure and light in themselves, and do not need too much effort. In recent years, there is a trend towards medium-sized vehicles (oil brakes are used for medium-sized buses with a load of less than 10 tons and some medium-sized buses with less than 19 seats). Most of the air brakes are used on large trucks, buses and concrete mixers. The vehicles have large space, need large braking force, long service distance, and fast response speed. The increased cost is reflected in the proportion of the whole vehicle.
Next, let's talk about the difference between the air brake and the oil brake of the fully automatic feeding and mixing vehicle.
1. The parking brake of ordinary air brake can only be used when the truck is still, because its braking torque acts on the transmission shaft. If it is used in the driving of small mixer, it is easy to cause serious overload on the transmission shaft and the rear axle, and the rotation direction of the left and right wheels may be opposite due to the locking of the differential case, resulting in the deviation or even U-turn of the truck during braking.
However, the energy storage spring brake is not. On the contrary, because the parking brake stroke of the energy storage spring is greater than that of the service brake, the energy storage spring can be used to assist the emergency braking when the service braking force is insufficient. Therefore, the energy storage spring brake can be used not only for parking brake, but also for emergency braking. Therefore, compared with the ordinary air brake, the air brake system has a better braking stability and safety.
2. The structure of the oil brake is simple and the installation space is small. It only needs the brake master cylinder, sub cylinder, oil cup and connecting pipeline, and no other auxiliary equipment is needed; The air brake is much more complicated. In addition to the brake master cylinder, slave cylinder and brake pipeline, there are also air pump, air reservoir, high-pressure controller, relay valve and other components. The installation space is large and the structure is complex. In order to ensure safety, the rear brake sub cylinder is now air cut brake.
3. The conventional brake is that the hand brake locks the transmission shaft, and the compressed air enters the brake chamber to lock the wheels when foot brake. In case of mechanical failure of the hand brake or transmission shaft, the hand brake fails; when any part of the air pump, pipeline, air reservoir and brake valve fails, the foot brake fails. The air brake can effectively avoid these dangers
4. There is a strong spring in the brake air chamber of the air brake, and the compressed air will jack up the spring when driving. The handbrake is to let the air out and let the spring lock the brake. When the air pressure is too low, the brake effect will be produced to ensure safety.
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