Driving structure of four cylinder engine balance shaft

Abstract

The invention discloses a driving structure of a four cylinder engine balance shaft. The driving structure of the four cylinder engine balance shaft comprises two pairs of supporting bearings, two balance shafts, two transmission gears, one drive gear and one idle pulley, wherein the drive gear is installed at a first crank arm or formed directly by processing the first crank arm; two balance shafts are respectively installed at the left side and the right side of a four cylinder engine body; the front ends of the two balance shafts are respectively equipped with the transmission gears; one side, equipped with one transmission gear, of one balance shaft is provided with the idle pulley; the idle pulley is engaged with the transmission gears; the drive gear directly drives the transmission gears or drives the transmission gears through the idle pulley; the four cylinder engine body is provided with balance shaft mounting holes; the supporting bearings are installed in the mounting holes in an interference manner; the balance shafts are mounted from one end of the four cylinder engine body and thrust; each balance shaft is supported by two supporting bearings. The driving structure of the four cylinder engine balance shaft provided by the invention has the following advantages that a balance driving mechanism is arranged at the inside of the engine body, compared with the manner of being arranged at the outside, the structure, lubrication and sealing design of a front cover cap can be simplified.

Description

technical field [0001] The invention relates to the technical field of balance shafts, in particular to a drive structure for a balance shaft of a four-cylinder engine. Background technique [0002] With the continuous development of internal combustion engine technology, the requirements for NVH performance continue to increase. For an inline four-cylinder engine, one of the effective ways to improve NVH performance is to add a balance shaft mechanism to the engine to balance the second-order reciprocating inertial force of the engine. The balance shaft mechanism is installed on the engine body and is generally driven by the crankshaft through gears or sprockets. [0003] When designing a new engine, it is generally necessary to consider matching multiple models. Some models have lower requirements on NVH performance and generally do not have a balance shaft mechanism. When designing the engine, how to take into account the above-mentioned various models and realize the o...

AI Technical Summary

Problems solved by technology

When the engine does not need the balance shaft mechanism, this arrangement will lead to the rearrangement of the transmission mechanism and affect the work of other components on the same transmission chain.

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