If the structure of the intake and exhaust cams is exactly the same, the valve spring parameters are the same. Assuming that the intake and exhaust valves are simultaneously opened or closed, the forces P1 and P2 of the intake and exhaust rocker arms on the rocker arm shaft should be exactly equal, and the resultant force P acts on the ideal bolt axis, so that the ideal bolt is only stretched. force. Positioning Accuracy Analysis of Locating Pin In order to facilitate the disassembly assembly and maintenance of the cylinder head, when the 16V280ZJ type is to be repaired, the rocker arm mechanism needs to be removed, and the rocker arm mechanism must be reassembled to the correct position on the cylinder head. pin. Since the height of the rocker arm is large, the position of the rocker arm and the cylinder head is adjusted, and the bolt is used for fastening. It is difficult to drill and align the pin hole from the top surface of the rocker arm. Therefore, the two positioning pins of the 16V280ZJ diesel engine are respectively drilled and reamed on the two joint surfaces of the cylinder head and the rocker arm body, so that the positioning pin positioning accuracy is not high. If the left and right errors of the positioning pin are too large, the action line of the tappet on the rocker arm force will not be in the same plane as the rocker arm symmetry plane, see Figure 3. If the line of action of the tappet force leaves the symmetry plane H of the rocker arm, the force P can be decomposed into: a vertical force P' (making the rocker arm open the valve) and a horizontal force P" (making the rocker arm mechanism occur along the rocker arm) The axis moves and rotates, and the center of the torque is the center of gravity of the triangle determined by the three bolt axes). Wherein the magnitude of the P′′ force is P′′=Psina, and the larger the angle a between the P and the symmetry plane of the rocker arm, the larger the P′′, and the greater the amplitude of the rocker arm mechanism swinging left and right. In addition, if the cylinder head Excessive deviation of the mounting position on the body will also cause the action line of the tappet to the rocker arm to deviate from the symmetry plane of the rocker arm. Due to the influence of the positioning pin positioning error, the remote arm mechanism has a tendency of displacement and rotation, and the strength and rigidity of the three fastening bolts are insufficient, and some displacement and rotation tendency are transmitted to the positioning pin, so that the positioning pin is damaged due to being squeezed, and is lost. The role of the positioning pin. If the positioning error is further expanded, the swinging of the rocker arm is aggravated, causing the positioning pin to be sheared off. The position error of the cylinder head mounted on the machine body also causes the rocker arm mechanism to swing left and right, thereby causing the rocker arm mechanism fixing bolt to break. It is recommended that the manufacturer manufacture the cylinder head of the diesel engine in the future: 1. When increasing the diameter of the fastening bolt, consider replacing the material of the manufacturing bolt. The bolt is made of a material having high strength and good bending resistance. 2. When installing the cylinder head, the position of the rocker arm and the push rod should be automatically positioned to minimize the position error. In addition, it is necessary to appropriately increase the diameter of the positioning pin. Outdoor Garden Light is typically used to illuminate areas such as gardens, lawns, pathways, and courtyards. They can be pole-mounted, wall-mounted, or ground-mounted and typically use LED or other energy-efficient bulbs to provide efficient lighting. Outdoor Garden Lights can also be equipped with sensors to automatically turn on or off when detecting people or animals, saving energy and increasing safety. Additionally, they can have different designs and colors to meet various outdoor design needs. Outdoor Garden Light,Farmhouse Style Steel Outdoor Lamp,Outdoor Wall Lamp Garden Lighting,Garden Pendant Lamp Zhengdong Lighting Co., Ltd. , https://www.sundint.com