Engine timing gear

Abstract

The invention provides a timing gear which can effectively reduce the vibration of an engine and has low cost. The periphery of the timing gear of the engine is provided with teeth; in particular the periphery of the timing gear consists of a semicircle and a minor arc. According to a specific vibrating position, the corresponding timing gear is designed so that a contact position between a timing chain (a timing belt) and the timing gear just corresponds to the minor arc part of the timing gear in the vibrating process when the timing chain (the timing belt) is tightened; as the minor arc part is close to the position of axle center of the timing gear, the minor arc needs a shorter chain than the semicircle part and can offset the tightening part of the timing chain (the timing belt) without needing a tensioner to adjust, thereby reducing vibration; and similarly, when the timing chain (the timing belt) is relaxed, the contact position between the timing chain (the timing belt) and the timing gear just corresponds to the semicircle part of the timing gear and the relaxing part of the timing chain (the timing belt) can be offset.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a timing system of an engine. Background technique [0002] At present, many engines at home and abroad, especially engines with large displacement and high power, due to their own reasons, their system vibration, especially resonance, cannot be avoided. The cost of the device itself, but also because of the increase in tension, the load on other system components also increases, resulting in an increase in cost. In addition, the vibration of the system will cause phase deviation, and the phase deviation will directly affect the overall performance and reliability of the engine. With the widespread use of some diesel engines with harsher working conditions and some high-tech technologies such as VVT, TCI, GDI, and TGDI, the vibration of the engine system, especially the vibration of the camshaft, has increased dramatically. In order to reduce system vibration and re...

AI Technical Summary

Problems solved by technology

In order to reduce system vibration and reduce phase deviation, manufacturers have adopted various new technologies, such as using devices such as crankshaft torsional vibration dampers on camshafts. These devices are not only expensive, but also more complicated to use, which will greatly increase engine Expenses for development, manufacturing, assembly, and maintenance

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