The
Rocker Arm is an important part of the engine valve mechanism, and its structure design is exquisite, which is mainly composed of the arm body, fulcrum, contact end with the valve and contact end with the drive part. As the main part, the arm body is usually a slender lever, which provides mechanical support for the whole rocker arm. The pivot point is located in the center or near the center of the rocker arm, which is the key to realizing the rotation of the rocker arm. The shaft fulcrum passes through an axis of the rocker arm, so that the rocker arm can rotate smoothly around the axis; The pivot pivot is similar to a spherical joint, giving the rocker arm a certain degree of freedom to swing. The contact end with the valve directly acts on the top of the valve rod. The shape and material of the part should ensure a good fit with the valve and sufficient wear resistance. The design with flat contact and roller is common. The contact end with the roller can effectively reduce the friction and wear between the valve and the high speed engine is widely used. The contact end with the drive component receives the driving force from the
Camshaft or the push rod, and its structure will vary according to the different driving methods, for example, in the top rod engine, the end is usually a plane or with a specific groove to allow accurate fit with the push rod.
Maintenance essentials：
Check wear regularly: During long-term work, the parts of the rocker arm in contact with the valve and drive components are prone to wear. Check the wear degree of the rocker arm regularly, and observe whether the contact end has obvious wear marks, deformation or peeling phenomenon. If the wear is serious, the rocker arm should be replaced in time to avoid affecting the normal opening and closing of the valve, resulting in reduced engine performance, such as insufficient intake, poor exhaust, weakened power, increased fuel consumption and other problems.
Ensure good lubrication: The fulcrum of the rocker arm and the point of contact with other components require good lubrication to reduce friction and wear. According to the maintenance requirements of the engine, replace the oil regularly to ensure the quality of the oil and the normal oil level. The oil will lubricate the rocker arm during the flow process, forming an oil film and reducing the coefficient of friction between components. At the same time, pay attention to check whether the lubrication system of the engine has leaks and other faults to ensure that the rocker arm is always in a good lubrication environment.
Check the rocker arm clearance: The rocker arm and the valve need to maintain a proper clearance to compensate for the thermal expansion of the parts when the engine is working. If the clearance is too large, the valve will be closed loosely, resulting in air leakage and affecting the power output of the engine. Too small clearance may make the valve unable to close normally at high temperatures, and even cause serious accidents such as valve and piston collision. Periodically use tools such as feelers to check the rocker arm clearance, and adjust it according to the requirements of the engine maintenance manual to ensure that the clearance is within the normal range.
Pay attention to the abnormal sound of the engine: During the operation of the engine, pay attention to whether there is an abnormal knocking or friction sound. If the rocker arm is faulty, such as serious wear, loosening or breaking, it may produce abnormal noise. Once the abnormal sound is found, it should be stopped immediately to check, determine the cause of the fault and repair it in time to avoid further expansion of the fault and damage to other parts of the engine.
