As the core component for controlling the opening and closing of the valves, the manufacturing precision of the passenger car engine camshaft is closely related to fuel economy. The high-precision manufacturing process enables the camshaft to more accurately control the movement of the valves and optimize the intake and exhaust processes of the engine, thereby effectively reducing fuel consumption while improving power performance.
The manufacturing precision of the passenger car engine camshaft directly affects the opening and closing timing of the valves. The precise manufacturing process ensures that the camshaft profile is highly consistent with the design parameters, so that the valves can be opened and closed at the best time for the engine to work. If the intake valve is opened too early or too late, fresh air cannot fully enter the cylinder, and the combustion process cannot get enough oxygen, resulting in incomplete combustion of the fuel and wasting energy. If the opening and closing timing of the exhaust valve is not accurate, the residual exhaust gas cannot be discharged in time, which will affect the entry of the new mixture and also reduce the combustion efficiency. The high-precision camshaft ensures that the valves act strictly in accordance with the requirements of the engine working cycle, creating good conditions for the full combustion of the fuel.
The camshaft with high manufacturing precision can achieve precise control of the valve lift. The valve lift determines the amount of air that enters the cylinder per unit time. Precise valve lift control can flexibly adjust the intake volume according to the needs of different engine working conditions. When the engine is running at low load, a small and precise valve lift can reduce the intake resistance, reduce pumping loss, and avoid unnecessary fuel consumption; under high load conditions, sufficient and precise valve lift can ensure sufficient air supply, so that the fuel can be fully burned and release maximum energy. This precise control ability allows the engine to operate in the best state under various working conditions and improve the efficiency of fuel utilization.
During the processing of high-precision camshafts, a good matching clearance between the journal and the bearing can be ensured. The appropriate matching clearance can ensure the smooth rotation of the camshaft and reduce friction loss. If the manufacturing precision is insufficient and the clearance between the journal and the bearing is too large, it will cause oil leakage, reduce the lubrication effect, increase friction resistance, and require the engine to consume more energy to overcome these additional resistances, thereby increasing fuel consumption; if the clearance is too small, it may cause jamming between components, which will also cause power loss and increased fuel consumption. Only camshafts manufactured with high precision can achieve ideal matching clearance, making the engine run more smoothly and efficiently and reducing energy loss.
Manufacturing precision is also reflected in the surface quality of the camshaft. High-precision machining can make the camshaft surface smoother and flatter, reducing friction with components such as valve tappets. When there are tiny unevenness or roughness defects on the camshaft surface, greater friction will be generated in the relative movement with other components, which will not only increase mechanical wear, but also consume more engine power. The smooth surface can effectively reduce the friction coefficient and reduce the loss of energy during the friction process, so that the power output of the engine can be used more to drive the vehicle forward, indirectly improving fuel economy.
The passenger car engine camshaft manufactured with high precision can achieve more precise matching during the assembly process with other engine components. The precise positional relationship and movement coordination between the components help optimize the overall working performance of the engine. For example, the timing matching accuracy between the camshaft and the crankshaft directly affects the ignition and injection timing of the engine. High-precision camshafts can ensure more accurate cooperation with the crankshaft, so that fuel injection and ignition occur at the best time, promote full combustion of fuel, improve combustion efficiency, and reduce fuel consumption.
From the perspective of long-term use, high-precision manufactured camshafts have better dimensional stability and reliability. During the long-term operation of the engine, the high-precision camshaft can maintain its shape and size stability and continuously ensure the accuracy of valve control. There will be no loss of valve control due to wear, deformation and other problems, which will affect engine performance and fuel economy. This stability extends the service life of the camshaft and reduces the additional fuel consumption caused by the decline in component performance, providing a guarantee for the long-term energy-saving operation of the vehicle.
The manufacturing accuracy of passenger car engine camshafts has an important impact on fuel economy from multiple aspects such as valve control, matching clearance, surface quality, component assembly and long-term stability. High-precision camshafts can ensure that the engine can achieve efficient intake, exhaust and combustion processes under various working conditions, reduce energy loss, improve fuel utilization efficiency, bring better fuel economy performance to the vehicle, and also help reduce the cost of use and reduce exhaust emissions.
