Cummins Rocker Arm Shaft 3176772

Under the action of the rotating blades of the camshaft, one end is raised or lowered (either directly or through a gear follower (lifting rod) and push rod to achieve this), while the other end acts on the valve stem. When the blades of the camshaft raise the outer rod arm, the force generated inside will press on the valve stem, thereby opening the actuating valve. When the outer arm rod allows to return due to the action of the camshaft, the inner arm rod rises, allowing the valve spring to compress and close the actuating valve.

The driving cam operates through the drive of the camshaft. It can push the rocker arm to move up and down near the gun barrel axis or the rocker shaft. This can reduce the wear at the contact point of the driving cam with the valve stem under the action of the roller follower of the cam. At the same time, through the action of another cam roller follower, a similar movement is transmitted to the second rocker arm. Thus, the rotating of the rocker shaft is achieved, and the action is transmitted upward to the valve through the gear follower. In this case, the intake valve opens, and the gas rushes towards the cylinder head.

Power is transmitted through the meshing part between two gears. It is a device that transmits motion and power by means of a gear pair. It is the most widely used mechanical transmission method in modern various equipment. Its transmission is accurate, has high efficiency, has a compact structure, and is reliable in operation, with a long service life.

1. High transmission accuracy. The transmission ratio of the commonly used involute gears in modern times is accurate and constant. This is not only a key requirement for precision machinery and instruments, but also an important condition for reducing dynamic loads and achieving smooth transmission under high-speed and heavy-load conditions.

2. Wide application range. The power transmission range of gear transmission is extremely wide, ranging from 0.001W to 60,000kW; the circumferential speed can be very low or as high as 150m/s. Belt transmission and chain transmission are difficult to compare.

3. It can achieve transmission between any two axes in space, such as parallel axes, intersecting axes, and crossed axes, which is beyond the reach of belt transmission and chain transmission.

4. Long service life and high transmission efficiency.

5. Relatively strict requirements for environmental conditions. Except for a few cases of low speed and low precision, generally it needs to be installed in a box to prevent dust and dirt, and lubrication should also be given attention.