Multi-section molded line cam

Abstract

The invention aims to provide a multi-section molded line cam, which comprises an actuating travel section and a return travel section. The actuating travel section corresponds to two forward uniform acceleration stages, three forward constant speed stages and two forward uniform deceleration stages of movement rules of a plunger driven part, and the return travel section corresponds to a backward uniform acceleration stage, a backward constant speed stage and a backward deceleration stage of the movement rules of the plunger driven part. A working section comprises the three constant speed stages, the second uniform acceleration stage and the first uniform deceleration stage of the actuating travel section. The speed of the first constant speed stage of the working section is v1, the speed of the second constant speed stage of the working section is v2, the speed of the third constant speed stage of the working section is v3, and the speed of the backward constant speed stage is v4. The oil injection pressure and oil injection speed of main injection are increased, different requirements of oil injection of each stage for the oil injection pressure and the oil injection speed during multiple injection are combined, and the aims of lowering the working noise of an engine, reducing the emissions of pollutants and improving an oil injection atomization effect are fulfilled.

Description

technical field [0001] The present invention relates to a cam, in particular to a cam of an engine. Background technique [0002] In the traditional technology, the fuel supply pump cam used in the electronic control fuel injection system of diesel engine is a constant velocity cam, and its thrust section corresponds to the positive constant acceleration, forward constant velocity and forward constant deceleration stages of the plunger follower movement law, and the return stroke The segment corresponds to the reverse constant acceleration, reverse constant velocity and reverse deceleration stages of the motion law of the cam plunger follower. Its working section is the positive constant velocity stage. The constant velocity cam has been widely used in the actual fuel injection system, and it has the advantage of being easy to control the injection law, but there are also disadvantages: with the increasingly stringent emission regulations and the increasing requirements for...

AI Technical Summary

Problems solved by technology

The constant velocity cam has been widely used in the actual fuel injection system, and has the advantage of being easy to control the injection law, but there are also disadvantages: with the increasingly stringent emission regulations and the increasing requirements for the economic performance of diesel engines, Multi-stage fuel injection technology has been widely used and easy to use. However, the traditional constant-velocity cam profile cannot simultaneously take into account the requirements of each stage for injection pressure and fuel injection rate during multi-stage fuel injection. The movement rate of the engine is relatively large, which leads to the excessive injection pressure and injection rate of the pre-injection and post-injection, which increases the difficulty of the control system in controlling the small injection volume, making it last too long and the injection volume is too large , can not achieve the purpose of reducing noise and reducing pollutant generation by pre-injection, and will also lead to incomplete combustion of too much fuel injected in post-injection, thus failing to meet the requirements of emission regulations and economic efficiency

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