Engine balance shaft mechanism and engine assembly

Abstract

An engine balance shaft mechanism comprises a balance shaft shell, a balance shaft, a rear balance weight, a balance shaft gar and a front balance weight. The balance shaft comprises a front end, a rear end, and a middle connecting segment connected between the front end and the rear end. The rear balance weight is fixed at the rear end of the balance shaft. The balance shaft gear and the front balance weight are fixed at the front end of the balance shaft. The front balance weight and the rear balance weight are disposed in an angular opposition form. The balance shaft shell covers the balance shaft, the rear balance weight, the balance shaft gear and the front balance weight. The side of the balance shaft shell is provided with a first mounting face used for being mounted on the side of a cylinder block of an engine; the side of the cylinder block is provided with a second mounting face; the first mounting face is in mounting fit with the second mounting face. The engine balance shaft mechanism is simple in structure, small in size, and convenient to arrange. The invention further relates to an engine assembly.

Description

technical field [0001] The invention relates to the technical field of automobiles, and in particular to an engine balance shaft mechanism and an engine assembly. Background technique [0002] Engine vibration and noise directly affect the comfort of the vehicle and the structural strength of the engine itself. Excessive vibration will lead to the service life and performance of related parts. Generally speaking, it is difficult to balance the reciprocating inertial force of the crank-link mechanism of an engine with an odd number of cylinders, and it is usually necessary to add a balance shaft to balance it, such as an engine with 3 cylinders and 5 cylinders. [0003] The existing engine balance shaft mechanism is arranged in the lower part of the engine, including parts such as balance shaft housing, balance shaft, counterweight, drive chain, gear, etc., and its working principle is that the crankshaft drives the chain usually to drive the balance shaft mechanism. This en...

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Problems solved by technology

This engine balance shaft mechanism itself has complex structure, many parts, high cost, and complicated manufacturing and assembly processes; moreover, because the balance shaft is arranged at the lower part of the engine, the height of the entire engine is increased, and the zero point far away from the center of the engine will be caused by the increase in height. The increased component amplitude increases the possibility of component damage, and the space utilization rate is low, which makes the engine structure not compact enough; in addition, the chain transmission mechanism is complicated, and the mechanical loss power caused by the chain tensioning mechanism is large, and the engine fuel consumption Affected

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