The invention relates to an in-line arrangement four-cylinder
diesel engine balance mechanism, which comprises a balance mechanism case and two balance shafts, wherein the two balance shafts are arranged inside the balance mechanism case through balance mechanism sliding bearings, the two balance shafts are both provided with balance blocks,
balance shaft gears which are mutually engaged are respectively arranged on the balance shafts, the two balance blocks are uniformly arranged on the two balance shafts, the two balance blocks have different
mass-
radius products, the
diameter of the balance block with large
mass-
radius product equals to the
diameter of a dedendum circle of the
balance shaft gear, both end surfaces of the
balance shaft gear in the axial direction are provided with grooves, and balance block
gravity center regulators are arranged in the grooves. Engine oil pumps are arranged on the
flange surface of the balance mechanism case and can move. The invention has the advantages of reasonable structure, small vibration of the mechanism per se,
low noise, convenient repairing and maintenance and long service life, and can realize the 100 percent balance of the secondary reciprocating
inertia of the engine and the 19.51 percent
inertia overturning moment counteraction. Through the test, the vibration intensity grade reaches grade B level, and the work
noise is reduced by 5.0 dB(A).