Distribution cam for internal combustion engine

A valve cam, internal combustion engine technology, applied in valve details, valve drive devices, etc., can solve the problems of limited cam performance, unfavorable profile optimization design, poor flexibility, etc. smooth effect

Active Publication Date: 2011-01-19
HYCET ENGINE SYST JIANGSU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the entire working section of the functional cam in the prior art is composed of a single functional formula, which is not conducive to the optimal design of the profile, and the flexibility is poor, which also limits the further improvement of the performance of the cam to a certain extent.

Method used

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  • Distribution cam for internal combustion engine
  • Distribution cam for internal combustion engine
  • Distribution cam for internal combustion engine

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Embodiment Construction

[0058] The invention optimizes the profile design of the cam, improves the performance of the engine, and has the following characteristics:

[0059] 1. The present invention adopts ISAC (subsection acceleration function), these functions are the first-selected method when the cam profile is optimized, and can be applied to any form of valve train cam.

[0060] 2. ISAC can be freely matched with any function, with good flexibility, such as convenient control of positive acceleration width, etc.

[0061] 3. Available acceleration function types: sine function, polynomial, straight line or transition arc.

[0062] 4. The rising edge (or falling edge) is generally divided into 6 to 10 segment functions to determine how to match the general speed value, jerk characteristics, torque characteristics, and the complexity and workload of matching curves.

[0063] image 3 The profile line of the intake cam working section shown is composed of 12 functional curves, which are sequentia...

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PUM

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Abstract

The invention discloses a distribution cam for an internal combustion engine, which is used for improving the performance of an engine. The technical scheme is that: the distribution cam comprises an admission cam and an exhaust cam, and the outline of the cam consists of a base circle and a working section, wherein the working section consists of an ascending section and a descending section; transition sections are arranged between the ascending section and the base circle and between the descending section and the base circle; after improvement, a working section line is a piecewise acceleration function curve; and an ascending value of the cam and corresponding values among lead angles of the cam are given in the piecewise acceleration function curve. In the distribution cam, an ISAC piecewise acceleration function design and an optimization cam line are adopted and the fullness coefficient of the cam is up to 0.54, so that a diesel engine has the characteristics of high air inflation performance, high power performance, low noise, stable operation and small vibration.

Description

technical field [0001] The invention relates to a diesel engine gas distribution cam with optimized profile design, which belongs to the technical field of engines. Background technique [0002] The profile design of the gas distribution cam of an internal combustion engine is extremely important in the design of the gas distribution mechanism, because the speed of the valve switch, the size of the opening, and the length of the opening time all depend on the shape of the gas distribution cam. That is, the fullness coefficient depends on the shape of the valve lift curve, and the shape of the valve lift curve depends on the design of the cam profile. [0003] The entire cam profile is composed of a base circle, an ascending section and a descending section, wherein the ascending section and the descending section are respectively divided into two parts: a transition section (buffer section) and a working section. The purpose of setting the transition section is to control t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/08
Inventor 柴晓娜高定伟刘刚
Owner HYCET ENGINE SYST JIANGSU CO LTD
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