Construire une ligne de sécurité de freinage: la composition et les détails d'entretien du système de freinage pneumatique

Quels sont les principaux composants du système de freinage pneumatique d’un camion ?

Le système de freinage pneumatique pour camion est une garantie importante pour la conduite sûre des gros véhicules. Il s'appuie sur l'air comprimé pour entraîner le dispositif de freinage afin d'obtenir un effet de freinage efficace et fiable. Le système a une structure complexe et est composé de divers composants professionnels. Les différentes pièces coopèrent les unes avec les autres pour garantir que le véhicule puisse freiner de manière stable dans différentes conditions de travail.
Compresseur d'air
Le air compressor is the power source of the entire air brake system. Its main function is to use the engine power to compress the air, compress the air in the atmosphere to a high pressure state, and provide the system with the air source required for braking. The air compressor is usually driven by the engine crankshaft belt, with a sturdy structure and high working efficiency. The compressed air has a high pressure and temperature and needs to be processed later before it can be used.
Sécheur d'air
Le air dryer is installed between the air compressor and the air tank. Its main function is to remove moisture and oil from the compressed air to prevent ice and corrosion inside the system. If the moisture in the air is not removed in time, it will cause the brake line to freeze in cold weather, seriously affecting the braking performance. The air dryer contains a desiccant inside, which can effectively absorb moisture, and is equipped with an automatic drainage device to keep the air dry and clean.
Réservoir d'air
Le air tank is used to store compressed air that has been dried to ensure that the brake system has a stable and continuous air supply when in use. The air tank is usually divided into a main air tank and an auxiliary air tank, and the capacity is determined according to the size of the vehicle and the braking demand. Condensation often accumulates inside the air tank and needs to be discharged regularly to prevent internal corrosion and blockage of the pipeline.
Valve de frein (valve de frein à pied)
Le brake valve is a key component for the driver to control air brakes. When the brake pedal is pressed, the brake valve adjusts the air pressure to the brake chamber, drives the brake mechanism to operate, and achieves vehicle deceleration or parking. The brake valve used in modern trucks usually integrates pressure feedback and multi-stage adjustment functions to ensure sensitive braking response and safety and reliability.
Chambre à air de frein
Le brake air chamber is the core component that converts air pressure into mechanical force. A diaphragm or piston is arranged in the air chamber, which pushes the connecting rod after receiving the air pressure from the brake valve, and drives the brake shoe or brake pad to press the brake drum or brake disc. Brake chambers are divided into service brake chambers and spring brake chambers. The service brake chamber is mainly responsible for braking when the vehicle is driving, while the spring brake chamber is used for parking and emergency braking.
Chambre de frein à ressort
Le spring brake chamber is equipped with a strong preload spring, which uses the mechanical force of the spring to maintain the braking state. This component is mostly used for parking brakes to ensure that the vehicle does not slip when parking. After the engine is started and inflated, the air pressure will compress the spring and release the braking state. The safety performance of the spring brake chamber is extremely important, and the integrity and air pressure of the spring need to be checked regularly.
Bielle et régulateur de frein
Le brake connecting rod transmits the thrust of the brake chamber to the brake mechanism to complete the conversion of air pressure to mechanical force. The regulator is responsible for automatically or manually adjusting the gap between the brake shoe and the brake drum to compensate for the wear of the brake shoe and maintain the braking efficiency. The automatic regulator can reduce the frequency of manual adjustment and improve the stability and safety of the system.
Conduite de frein
Le brake line includes the air pipeline connecting the compressor, air tank, brake valve and air chamber. The pipeline material must be resistant to high pressure, corrosion and cold, and is usually made of a combination of rubber hoses and steel hard pipes. Reasonable pipeline design can prevent air pressure leakage and mechanical damage, and is the basis for ensuring the air tightness and stability of the brake system.
Soupape de sécurité
Le safety valve is installed at the air tank and key pipeline positions to prevent the system air pressure from exceeding the set upper limit. When the system air pressure rises abnormally, the safety valve automatically opens to release excess gas to avoid bursting of the air tank or pipeline and ensure system safety. The safety valve must be inspected regularly to ensure its reliability.
Appareils auxiliaires
Le air brake system is equipped with a variety of auxiliary devices, such as barometers, air pressure alarms and pressure sensors. The barometer provides the driver with real-time air pressure information, and the air pressure alarm sounds an alarm when the air pressure is lower than the safety threshold, reminding the driver to deal with it in time. The pressure sensor provides data support for the vehicle's electronic control unit to ensure intelligent management of the system.

Comment le récepteur de frein convertit-il la pression de l’air en force mécanique ?

Le brake chamber is a key actuator in the truck air brake system. Its core function is to convert the air pressure energy of compressed air into mechanical force, thereby driving the brake mechanism to slow down or stop the vehicle. The design structure and working principle of the brake chamber are directly related to the response speed of the brake system and the stability of the braking force.
Structure de base du récepteur de frein
Le brake chamber is mainly composed of a chamber shell, a diaphragm (or piston), a push rod and a spring. The chamber shell is made of solid metal material, and the interior is divided into two main spaces: the air pressure chamber and the spring chamber. The diaphragm is usually made of wear-resistant rubber material, with good sealing performance and can withstand repeated changes in air pressure. The push rod connects the diaphragm or piston to transmit the thrust generated by the air pressure to the brake mechanical part.
Distinction fonctionnelle entre la chambre à pression d'air et la chambre à ressort
Le air pressure chamber is the part of the brake chamber that receives compressed air. Air enters the air pressure chamber from the brake valve through the pipeline, and the air pressure increases, pushing the diaphragm or piston outward. The spring chamber is equipped with a preloaded spring to provide reverse force and is used for parking brakes. When the air pressure is low, the spring force pushes the push rod back to the initial position and releases the brake state.
Principe de fonctionnement de la conversion de la pression atmosphérique en force mécanique
Lorsque le conducteur appuie sur la pédale de frein, la valve de frein introduit de l'air comprimé dans la chambre de pression d'air de la chambre à air de frein. La pression de l'air dans la chambre de pression d'air augmente rapidement, agissant sur la surface du diaphragme pour générer une poussée. L'ampleur de la poussée est proportionnelle à la pression de l'air et à la surface du diaphragme. Le diaphragme se dilate vers l'extérieur sous l'action de la pression de l'air, poussant la tige de poussée connectée à se déplacer axialement. Le mouvement de la tige de poussée entraîne la bielle et le mécanisme de réglage pour convertir l'énergie de la pression de l'air en force mécanique, qui est appliquée au segment de frein ou à la plaquette de frein pour obtenir le serrage du tambour de frein ou du disque de frein.
Transmission mécanique du mouvement de la tige de poussée
Le end of the push rod is usually connected to the brake connecting rod through a pin or a ball head. The axial movement of the push rod drives the brake mechanism to work. The brake connecting rod converts the linear motion of the push rod into the clamping motion of the brake shoe, forming friction and generating braking force. The distance the push rod moves determines the magnitude of the braking force, and a reasonable push rod stroke design ensures the linearity and sensitivity of the braking effect.
Le difference between diaphragm and piston and their influence
Le diaphragm structure in the brake chamber uses a flexible diaphragm to transmit air pressure thrust. It has a simple structure and light weight, and is suitable for light and medium trucks. The piston chamber uses a rigid piston instead of a diaphragm, which has better sealing and is suitable for heavy vehicles. The piston structure reacts faster to changes in air pressure, and the mechanical force transmission is more stable, which improves braking performance and reliability.
Fonctions spéciales des vases de frein à ressort
Le spring brake chamber is equipped with a large preload spring outside the air pressure chamber, which is often used for parking brakes. During normal operation, the air pressure compresses the spring, the push rod is in a loose state, and the brake is released. When parking or emergency braking, the system air pressure is cut off, the spring releases energy to push the push rod, and the mechanical force acts on the brake mechanism to lock the wheel and achieve parking brake. The spring brake chamber ensures that the vehicle can remain in a safe parking state even if the air source is interrupted.
Étanchéité à l'air et vitesse de réponse du vase de frein
Le air tightness inside the chamber directly affects the effective conversion and response speed of air pressure energy. Poor sealing will cause air pressure leakage, weaken the push rod pushing force, and increase the risk of brake failure. High-quality diaphragm materials and sealing design ensure that the brake chamber maintains good performance under extreme working conditions. The rapid air pressure charging and discharging process ensures rapid braking response and improves driving safety.
Maintenance et manifestations de défauts des vases de frein
Des défauts courants tels qu'une rupture des diaphragmes du récepteur de frein, un blocage de la tige de poussée ou une fatigue du ressort peuvent entraîner une défaillance des freins ou une défaillance du frein de stationnement. Vérifier régulièrement l'étanchéité de la chambre à air et détecter la course de la tige de poussée et l'état du ressort sont la clé pour garantir la fiabilité du système de freinage. Les tests de pression atmosphérique et la détection des fuites peuvent détecter à l'avance les dangers cachés et éviter les accidents de conduite.

Pourquoi les sécheurs d'air sont importants pour les systèmes de freinage pneumatique

Sécheur d'airs are an indispensable key component in truck air brake systems. Its main function is to remove moisture and impurities from compressed air to ensure the normal operation and long-term durability of the internal pipes and components of the brake system. The role of air dryers is directly related to the reliability, safety and maintenance cost of the brake system.
L'humidité dans l'air comprimé et ses dangers
Le air brake system relies on an engine-driven air compressor to supply high-pressure air. After the air is compressed, the temperature rises, and the water vapor in the air begins to condense into water droplets during the cooling process. If these moisture are not effectively treated, they will enter the air tank and pipeline with the air, causing a variety of serious problems. Condensed water accumulates inside the pipeline and may freeze in a low temperature environment, blocking the air path and causing brake failure. Moisture can also cause rust and corrosion of internal parts of the system, reduce equipment life and cause leaks. Excessive moisture can also affect air pressure stability and cause insensitive brake response.
Principe de fonctionnement du sécheur d'air
Sécheur d'airs are usually installed between the air compressor and the air tank. Its core part is a desiccant (such as silica gel or molecular sieve), which can efficiently absorb moisture from the air. When compressed air enters the dryer, moisture is absorbed by the adsorbent, and the air discharged after treatment remains dry and clean. Modern air dryers are mostly equipped with automatic drain valves to regularly discharge moisture and impurities accumulated in the adsorbent to prevent water accumulation and blockage, ensuring a long-lasting and stable drying effect.
Prévention des ruptures de glace dans le système de freinage
Dans les environnements à basse température, l'humidité présente dans la conduite d'air gèle très facilement, bloquant le robinet de frein et la chambre à air, provoquant une défaillance des freins ou même une perte de contrôle du véhicule. Les sécheurs d'air éliminent efficacement l'humidité et empêchent l'accumulation d'eau condensée, réduisant ainsi considérablement le risque de blocage par la glace. L'importance des sécheurs d'air est particulièrement importante pour les véhicules circulant dans des zones froides ou en hiver, car ils garantissent directement la sécurité et la stabilité du freinage du véhicule.
Protéger les composants clés du système de freinage
Le internal pipes, valves, air chambers and air tanks of the braking system are all precision machinery and sealing components, which are extremely susceptible to moisture erosion. Long-term water vapor intrusion can cause metal rust, aging of sealing rings, and valve jamming, affecting braking performance. Air dryers extend the service life of these key components by providing dry air, reduce failure rates and maintenance costs, and improve the overall operating efficiency of vehicles.
Améliorer la stabilité de la pression atmosphérique du système et la vitesse de réponse
Une humidité excessive peut provoquer des fluctuations et des fuites de pression d'air, affectant l'étanchéité à l'air et la stabilité de la pression d'air du système de freinage. Les sécheurs d'air peuvent garantir que l'air entrant dans le réservoir d'air et les canalisations est sec et pur, et assurer un approvisionnement stable en pression d'air. Une pression d'air stable soutient l'action efficace du récepteur de frein, améliore la vitesse de réponse et la force de freinage et améliore la sécurité de conduite.
Réduire les difficultés et les coûts de maintenance
Les systèmes sans sécheurs d'air ou avec de mauvais effets de séchage nécessitent une vidange fréquente, un nettoyage des tuyaux et le remplacement des pièces corrodées et endommagées, ce qui augmente la fréquence et les coûts de maintenance. Les sécheurs d'air réduisent la charge de travail d'intervention manuelle et de maintenance en déshumidifiant et en évacuant automatiquement l'eau. Le taux de défaillance du système diminue, la durée de fonctionnement du véhicule augmente et les coûts d'exploitation sont considérablement réduits.
Types et scénarios applicables de sécheurs d'air
Les sécheurs d'air courants comprennent les sécheurs par adsorption et les sécheurs réfrigérés. Les sécheurs par adsorption absorbent l'humidité grâce à un déshydratant, ont une structure simple et sont largement utilisés dans les systèmes de freinage pneumatique des camions. Les séchoirs réfrigérés condensent et évacuent l'humidité en abaissant la température de l'air, ce qui convient aux exigences environnementales particulières. Différents types de séchoirs sont combinés avec l'environnement d'exploitation du véhicule et les conditions de travail pour sélectionner le modèle approprié afin de garantir le meilleur effet de séchage.
Points clés pour l’entretien des sécheurs d’air
Le déshydratant doit être remplacé régulièrement pour éviter une défaillance par saturation du déshydratant. La fonction de la vanne de vidange doit être maintenue normalement pour garantir l'élimination rapide de l'eau condensée et des impuretés. Le boîtier du sécheur d'air et l'interface doivent être vérifiés pour détecter les fuites et les bonnes performances d'étanchéité. Un entretien inapproprié entraînera une panne du sécheur, ce qui affectera les performances de sécurité de l'ensemble du système de freinage.

Comment le robinet de frein (clapet de pied) contrôle-t-il la pression de l'air de freinage ?

Le brake valve, also known as the foot brake valve, is a key component in the truck air brake system where the driver directly controls the brake air pressure. Its main function is to accurately adjust the air pressure according to the force and stroke of the driver's foot on the brake pedal, and drive the brake chamber to achieve vehicle braking. The design and working principle of the brake valve directly affect the response speed, stability and safety performance of the brake system.
Structure de base de la valve de frein
Le brake valve is mainly composed of a valve body, a piston or a sliding valve, a spring, a sealing ring and an adjustment mechanism. There are multiple air passages inside the valve body, which are responsible for guiding the air flow. The piston or sliding valve moves under the action of the spring force and air pressure to control the air flow interruption. The brake pedal drives the piston to move through a mechanical connecting rod or an electronic sensor to complete the air pressure regulation.
Principe de fonctionnement de la valve de frein
Lorsque le conducteur appuie sur la pédale de frein, le piston à l'intérieur de la valve de frein avance avec la course de la pédale. Le mouvement du piston modifie l'état d'ouverture et de fermeture du circuit d'air à l'intérieur du corps de vanne et contrôle l'air du réservoir d'air vers la chambre de pression d'air du récepteur de frein. Plus la pédale est enfoncée profondément, plus la valve s'ouvre et plus la pression de l'air entrant dans le récepteur de frein est élevée. L'augmentation de la pression d'air pousse le diaphragme ou le piston de la chambre de frein, générant une poussée mécanique pour réaliser le freinage. Relâchez la pédale, le piston se réinitialise, le circuit d'air est fermé, la pression d'air est relâchée et le frein est desserré.
Contrôle précis de la régulation de la pression d'air des freins
Le brake valve achieves continuous variable adjustment of air pressure through an internal adjustment mechanism. The valve body is designed with a pressure adjustment spring and a feedback device, which can finely adjust the output air pressure according to the pedal force. Accurate air pressure control ensures a smooth transition of braking force, avoids braking shock and vehicle shaking, and improves driving comfort and safety.
Conception de circuits d'air multivoies et garantie de sécurité
Le brake valve is equipped with multiple air circuits, which lead to different air tanks and air chambers to ensure stable air pressure supply. Some brake valves are equipped with a dual-circuit design, one circuit controls the front axle air chamber and the other controls the rear axle air chamber to improve braking safety. Some advanced brake valves also have an air pressure protection function. When the system air pressure is lower than the set value, the braking force is automatically limited to prevent brake failure.
Vitesse de réponse et performances d'étanchéité de la valve de frein
Le internal sealing ring and air circuit design of the brake valve directly affect the response speed of air pressure changes. Efficient sealing prevents air leakage and ensures stable air pressure. The brake valve with a compact structure and reasonable spring force can quickly respond to the driver's braking command, achieve rapid braking response, and enhance driving safety.
Coordination de la valve de frein à pied et du système de frein de stationnement
Le foot brake valve is mainly responsible for service braking during driving. The brake valve of some models integrates the parking brake function or is linked with the parking brake valve. The spring brake chamber is controlled by air pressure changes to realize the opening and release of the parking brake. The system design ensures that the parking brake and foot brake work together to meet different driving needs.
Manifestations de maintenance et de défaillance des valves de frein
Le vieillissement des joints de valve de frein, le blocage du piston ou la rupture des ressorts sont des causes courantes de défaillance. Cela conduit à une régulation insensible de la pression d'air, à des fuites d'air ou à un freinage irrégulier. Vérifiez régulièrement l'étanchéité à l'air, la course de la pédale et l'état des composants internes de la valve de frein pour garantir ses performances normales. Si un défaut est détecté, il doit être réparé ou remplacé à temps pour éviter les risques pour la sécurité.

Quel rôle joue la soupape de sécurité dans le système de freinage pneumatique ?

Le safety valve is a vital protective component in the air brake system. It is responsible for releasing excess air pressure when the system pressure rises abnormally, preventing system components from being damaged by overpressure, and ensuring the safety and stable operation of the entire brake system. Although the safety valve does not directly participate in the braking action, it plays an important role in the operation of the system.
Le basic structure and principle of the safety valve
Le safety valve is usually composed of a valve body, a valve seat, a spring, a valve core and an adjustment mechanism. The valve core seals the valve seat under the action of the spring force to maintain the closed state of the system. The spring preload sets the maximum safe air pressure of the system. When the system air pressure exceeds the set value, the air pressure overcomes the spring force to push the valve core open, and the overpressure gas is released through the exhaust port. After the air pressure drops to a safe range, the spring resets the valve core, reseals the valve seat, and the system returns to normal working state.
Contrôler la limite supérieure de la pression de l'air pour éviter la surpression du système
Le air brake system is supplied with air by an air compressor. If the control system fails or the compressor continues to work without stopping, the air pressure may continue to rise. Overpressure can damage and even burst components such as air reservoirs, brake valves, pipelines, and air chambers. The safety valve opens the exhaust in time before the air pressure reaches a dangerous level through the set opening pressure (usually 10%~15% of the upper limit of the system working pressure), playing the role of "the last line of defense" to avoid system damage and accidents.
Protéger le compresseur d'air et les composants du circuit d'air
Le air compressor is a high-frequency component in the brake system, and it is very easy to be damaged due to excessive back pressure during long-term operation. The safety valve releases excess air pressure in the system compression chamber or the main air tank, effectively reducing the compressor load and preventing problems such as shaft seal damage and cylinder jamming caused by back pressure. At the same time, the safety valve also protects the pipeline interface and air circuit valve to avoid impact rupture caused by sudden pressure changes and extend the service life of the system.
Assurer le fonctionnement stable du système de freinage du véhicule
Le air brake system must operate in a stable air pressure environment. Excessive air pressure not only damages the components, but also causes excessive braking response and excessive braking force, causing tire locking and vehicle loss of control. The safety valve limits the peak pressure and keeps the system pressure within a safe range, ensuring that the braking response is linear and controllable, and enhancing the driver's sense of safety and predictability.
Le rationality of the set pressure value and the system match
Le opening pressure of the safety valve should be higher than the normal working pressure of the brake system (usually 0.81.0 MPa), but lower than the maximum pressure bearing capacity of the system. It is generally set to 1.11.2 MPa. If the pressure is set too low, it is easy to open frequently and cause unstable air pressure; if it is set too high, it loses its protective effect. Reasonable setting requires comprehensive consideration of factors such as vehicle air path volume, braking frequency, and compressor air output to ensure that the safety valve intervenes only under real overpressure conditions, taking into account safety and system efficiency.
Emplacement d'installation et champ d'action de la soupape de sécurité
Le safety valve is usually installed on the main air tank or the main line of the total air path, giving priority to releasing the total pressure of the system. Some systems are also equipped with local safety valves on branch air tanks or independent air paths to protect branch circuit components. The installation location should ensure smooth exhaust and stay away from high temperature or flammable areas to prevent secondary risks caused by exhaust. The multi-level protection design enhances the robustness of the system and improves the safety level of the vehicle.
Exigences de matériaux et de durabilité des soupapes de sécurité
Soupape de sécurités are subjected to high-pressure gas for a long time, and key components such as valve cores, springs, and valve seats must have high strength, corrosion resistance, and fatigue resistance. Common materials include stainless steel, chromium-molybdenum alloy, engineering plastics, etc. The sealing part must have high temperature resistance and pressure change resistance to ensure that the valve remains sealed reliably during high-frequency opening and closing to avoid air pressure leakage or malfunction.
Inspection de maintenance et risque de défaillance des soupapes de sécurité
Soupape de sécurités are passive action devices. Long-term non-operation is prone to problems such as spring fatigue, valve core jamming, and seal aging. Regular opening and closing tests, cleaning of carbon deposits and foreign matter, and testing of opening pressure are necessary means to maintain its functional reliability. A failed safety valve may not be able to open when overpressure occurs, resulting in system damage or accidents; it may also open prematurely, affecting the inflation speed and efficiency of the brake system.
Coopération entre la soupape de sécurité et le système de régulation de pression
Les systèmes de freinage pneumatique sont généralement équipés de régulateurs de pression, de pressostats et de soupapes de sécurité qui fonctionnent ensemble. Le régulateur de pression contrôle le démarrage et l'arrêt du compresseur, le pressostat surveille le retour de pression d'air et la soupape de sécurité est utilisée comme dispositif de protection redondant pour garantir l'efficacité de plusieurs mécanismes de sécurité. La conception et le réglage de la soupape de sécurité doivent être coordonnés avec l'ensemble du système de contrôle de la pression d'air pour éviter les faux déclenchements ou les chevauchements de fonctions et améliorer la sécurité globale du système.

Quelles sont les priorités d’entretien quotidiennes du système de freinage pneumatique ?

En tant que dispositif de sécurité essentiel dans les véhicules lourds (tels que les camions, les bus et les remorques), la stabilité de fonctionnement du système de freinage pneumatique est directement liée à l'effet de freinage et à la sécurité routière de l'ensemble du véhicule. Le système se compose d'un compresseur d'air, d'un réservoir d'air, d'un sécheur, d'une valve de frein, d'une chambre à air de frein, d'un tuyau d'air et d'une variété de composants de commande. Il a une structure complexe et fonctionne fréquemment. Un entretien quotidien scientifique et standardisé peut non seulement prolonger la durée de vie du système, mais également prévenir efficacement les défaillances soudaines des freins.
Vérifier l'étanchéité à l'air du système
Le air tightness of the system is the core of ensuring stable air pressure. During maintenance, it is important to check whether there is air leakage at various pipe joints, hoses, connectors, welds of air reservoirs, and valve body interfaces. Use soapy water smearing method or a special leak detector to detect subtle leaks. For rubber hoses, check whether they are aging, cracked, or falling off. Good air tightness can prevent the system air pressure from dropping too quickly, ensuring the reliability of emergency braking and parking brakes.
Vidangez régulièrement l'eau et les impuretés du réservoir d'air
Le air tank is a gathering place for compressed air and is also the main area for condensed water and impurities to deposit. If it is not discharged in time, the water will corrode the cylinder, block the valve, and seriously affect the braking response. The air tank drain valve should be opened every day after parking to drain manually, especially in an environment with high humidity or low temperature. Some vehicles are equipped with automatic drainage devices, and their drainage function should also be checked regularly to prevent water accumulation.
Vérifier l'état de fonctionnement du sécheur d'air
Le air dryer is the first line of defense to prevent moisture from entering the brake system. It is necessary to regularly check whether the dryer filter element or adsorbent is saturated and ineffective. If it is found that the drying effect has deteriorated or a large amount of water is discharged from the air tank, the dryer filter element should be replaced in time. Note that the dryer exhaust port should be unobstructed and the exhaust valve should be sensitive to prevent water accumulation or freezing.
Gardez la valve de frein réactive
Le brake valve is the most directly related component of the air brake system to the driver's control. The brake valve pedal stroke should be checked regularly to see if it is appropriate, if the action is smooth, and if there is any jamming, air leakage or poor return. Check if the air chambers respond consistently during braking to avoid brake deflection or tail swinging due to asynchronous braking of the front and rear wheels. Disassemble and clean or replace seals if necessary.
Vérifier l'état du vase de frein et de la tige de poussée
Le brake chamber converts air pressure into mechanical braking force, and its reliability directly affects the braking effect. Focus on checking whether the air chamber shell is deformed, rusted or cracked, whether the push rod is freely retracted, and whether the dust cover is intact and undamaged. The spring mechanism of the parking brake spring chamber must function normally and the exhaust channel must be unobstructed. The push rod stroke must meet the manufacturer's standards to avoid insufficient braking force or damage to the air chamber.
Maintenir fermement le tuyau d'air et le raccord de joint
Le air pipe connecting the various components in the brake system needs to have sufficient pressure resistance and heat resistance. Check the pipeline for looseness, detachment, rupture, expansion or wear on a daily basis. In particular, the hoses at the chassis or active parts of the vehicle are susceptible to vibration and dust. The connection joints should be tightened reliably, and the quick-connect joints should be cleaned of foreign objects regularly to prevent leakage. Pipes used for a long time should be replaced according to the degree of aging.
Vérifier le système de freinage d'urgence et de frein de stationnement
Le frein d'urgence et le frein de stationnement sont des mécanismes importants pour garantir que le véhicule peut toujours s'arrêter de manière fiable lorsque le gaz est coupé ou que le moteur est arrêté. L'entretien quotidien doit vérifier si la chambre à air du frein à ressort peut appliquer automatiquement le frein lorsque le gaz est coupé. Le levier ou l'interrupteur de stationnement doit être précis et sensible. La capacité de maintien de la pression de stationnement après la coupure du système doit être conforme à la norme pour empêcher le véhicule de glisser en raison d'une fuite de pression d'air.
Détection du manomètre et du dispositif d'alarme
Le pressure gauge on the instrument panel is an important basis for the driver to understand the system status. It is necessary to confirm that the pressure gauge display is accurate and without deviation on a daily basis. The high-pressure and low-pressure alarm indicators and buzzers should alarm in time when the air pressure is abnormal. If necessary, check the working status of the electrical circuit and sensor to avoid blind driving caused by the failure of the alarm system.
Effectuer un test de stabilité de la pression d'air du système
Observez la vitesse de montée en pression de l'air en faisant tourner le moteur au ralenti et vérifiez si la puissance du compresseur est suffisante. Le système doit maintenir la vitesse de chute de pression après l'arrêt du moteur pour répondre à la norme. Le temps de réponse des freins et le taux de chute de pression peuvent être observés en appuyant manuellement sur la pédale de frein pour juger de la capacité de réponse du système et de la capacité de stockage d'air.