What is the principle of Wuling automobile brake system exhaust

The landlord, the exhaust brake device is composed of an exhaust brake button valve, an exhaust gas working cylinder, an exhaust brake butterfly valve, and an air and gas stop cylinder. The exhaust brake is easy to operate, simple and effective. When driving on ice, snow and slippery muddy roads, the use of exhaust brakes can reduce side skidding; When going down a long slope, the use of exhaust brakes can reduce the number of service brakes, reduce the temperature rise of the brake drum, and improve the reliability of braking.

When using exhaust brakes, the supply of engine oil can be reduced and the fuel can be cut off, which can save fuel.

The exhaust brake of Steyr automobile adopts the method of closing the exhaust channel of the engine, so that the engine piston is subjected to the back pressure of the gas during the exhaust stroke, preventing the operation of the engine and producing braking effect, so as to achieve the purpose of controlling the vehicle speed. When the driver uses the exhaust brake, he presses the exhaust brake button valve on the lower left of the cab floor with his foot, and the button valve is forced to open the air channel, and the compressed air enters the exhaust gas working cylinder. The piston of the exhaust gas working cylinder moves under the pressure of compressed air, drives the push rod, and the push rod drives the exhaust brake butterfly valve, and the butterfly valve rotates to block the exhaust pipe.

At the same time, the compressed air enters the cylinder at the same time when the button valve is opened, the piston of the cylinder moves under the action of compressed air, and the push rod drives the governor handle through the linkage mechanism to stop the oil. Due to a blockage of the exhaust pipe, the engine stops exhausting, the fuel ** is interrupted, and the pressure in the exhaust pipe rises to 0 3 0 4MPa. The operating exhaust stroke of the engine piston has to overcome this pressure, which greatly increases the power of the engine braking.

Therefore, when exhaust braking is adopted, when the engine piston is in the engine exhaust stroke, the piston is subjected to the back pressure of the gas, and is transmitted to the wheel through the crankshaft and transmission system, which increases the rotational resistance of the wheel and reduces the vehicle speed.

When the pressure in the exhaust manifold reaches a certain value, it will overcome the resistance of the valve spring, open the exhaust valve, and compress the air into the cylinder and discharge from the intake pipe to ensure that the pressure in the exhaust manifold will not continue to rise. At this point, the engine emits a special sound, which is harmless to the engine. There is no scientific basis for the belief that exhaust brakes are harmful to the engine.

When exhaust brakes are used, the fuel supply is stopped, and the engine essentially becomes an air compressor to consume energy to control the speed. Although the supply of engine fuel is stopped, the engine lubrication and cooling system are working normally, but from the output energy to the consumption of energy, which is harmless to the engine. When operating, attention should be paid to the integrity of all parts of the exhaust brake device, and if there is damage, it should be repaired or replaced.

In the downhill or downhill driving, the transmission should be selected the appropriate gear, generally choose the gear, so that the engine speed is too high to cause engine damage failure. When using the exhaust brake, it is not allowed to hang neutral and disengage the clutch, otherwise the exhaust brake will be ineffective and there will be a driving accident.

Taking the service brake system as an example, the figure shows a schematic diagram of the working principle of the braking system (drum hoof type). The braking system is mainly composed of brakes, hydraulic transmission mechanisms, etc. As long as the wheel brake has a rotating part and a fixed part, the brake drum is composed of an inner circular surface as the working surface, which is fixed on the wheel hub and rotates with the wheel.

The support pins (two) are fixed on the immovable brake floor and are supported at the lower end of the two curved brake shoes. The outer surface of the brake shoe is equipped with a friction lining that is generally non-metallic. There is also a hydraulic brake wheel cylinder on the brake floor, which is connected to the hydraulic brake master cylinder mounted on the frame with an oil pipe.

The brake master cylinder piston is operated by the driver via the brake pedal. When the braking system is not working, a certain gap is maintained between the inner circle surface of the brake drum and the outer surface of the brake shoe friction lining, allowing the wheel and the brake drum to rotate relatively freely. When the car needs to slow down, the driver steps on the brake pedal, and the oil in the brake master cylinder flows into the wheel cylinder under a certain pressure through the push rod and the brake master cylinder piston, and the oil pushes the two brake wheel cylinder pistons, so that the two brake shoes rotate around the support pin, and the upper end is separated to both sides and pressed on the inner circle of the brake drum with its friction lining.

In this way, the non-rotating brake shoe acts a frictional moment on the rotating brake drum in the opposite direction to the direction of rotation of the wheel. After the brake drum transmits the torque to the wheel, due to the adhesion between the wheel and the road surface, the wheel acts on the road surface with a forward tangential force, and the road surface acts on the wheel with a backward reaction force, that is, the braking force. The braking force is transmitted from the wheels to the frame and body through the axle and suspension, forcing the car to slow down to a certain extent.

The greater the braking force, the greater the deceleration of the car. When the brake pedal is released, the return spring pulls the brake shoe back into place. The frictional torque and braking force disappear and the braking is terminated.

Automobile braking methods mainly include: disc drum brake braking, eddy current braking (truck optional), exhaust brake (exhaust brake), of which the exhaust brake has poor efficiency and belongs to auxiliary braking.

There is a disc valve at the junction of the engine exhaust manifold and the exhaust pipe, and the solenoid switch is activated to turn it off, causing the engine to suffocate to achieve the braking effect, and it will automatically open when the accelerator is stepped on. The structure is simple, but it damages the engine.

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The working principle of the brake valve is: when the brake pedal is pressed, the pull arm of the brake valve is pulled, the hairspring upper seat is pushed down, the hairspring is pushed down through the hairspring, the lower seat and the steel ball, and the push rod and the steel ball push the two-cavity diaphragm assembly down. After the gap is removed, close the exhaust valve port first, and then open the intake valve port.

The compressed gas in the gas storage tank enters each brake chamber through a brake valve. The push rod pushes the adjusting arm to rotate the cam, and the brake shoe presses on the brake drum to produce a braking effect. Cars fitted with exhaust brake valves have the following advantages:

1.When the car is going down a long hill, you can significantly reduce the number and time of the service brakes to prevent the brakes from overheating and the braking force from decreasing, and keep the brakes in good condition at all times. It prolongs the service life of the shoes and reduces the fatigue of the driver when braking.

2.Exhaust braking is braking that is created by compressing the gas in the engine and exhaust pipe. Therefore, the braking is soft and impactless, which reduces the impact load of the parts, prolongs the service life of the related parts, and reduces the number of maintenance; 3.

The exhaust brake is transmitted to the drive wheels through the drivetrain. The differential of the drive axle evenly distributes braking torque to the left and right wheels. It reduces the tendency of the car to slide sideways, has a sense of security when driving, and can increase the average speed of the car; 4.

The oil stop switch of the exhaust brake has a certain fuel-saving effect.

The emergency shut-off valve is a control component in the fluid transfer system, which has the functions of shut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief. Classification by role and use.

1) Cut-off valves: such as gate valves, globe valves, plug valves, ball valves, butterfly valves, needle valves, diaphragm valves, etc. Cut-off valves, also known as closed-circuit valves and globe valves, are used to connect or cut off the medium in the pipeline.

Check valve, check valve is also known as check valve or check valve, check valve belongs to a kind of automatic valve, its function is to prevent the medium in the pipeline from backflowing, to prevent the pump and drive motor from reversing, and the leakage of container medium. The foot valve of the suction off of the water pump also belongs to the category of check valves. Explosion-proof valves, accident valves, etc., the function of safety valves is to prevent the medium pressure in the pipeline or device from exceeding the specified value, so as to achieve the purpose of safety protection.

Regulating valves, throttle valves and pressure reducing valves, their functions are to regulate the pressure, flow and other parameters of the medium.

2) Vacuum: such as vacuum ball valves, vacuum baffle valves, vacuum inflation valves, pneumatic vacuum valves, etc. Its function is in the vacuum system, the vacuum system element used to change the direction of the air flow, adjust the air flow volume, cut off or connect the pipeline is called the vacuum valve.

3) Special purpose: such as pig valve, vent valve, sewage valve, exhaust valve, filter, etc. Exhaust valve is an indispensable auxiliary component in the pipeline system, which is widely used in boilers, air conditioners, oil and gas, water supply and drainage pipelines.

It is often installed at the commanding height or elbow to remove excess gas in the pipeline, improve the efficiency of pipeline use and reduce energy consumption.