Automobile engine air distribution cam suitable for variable two-stage air valve lift

A technology of automobile engine and valve lift, applied in the direction of valve driving device, valve details, etc., can solve the problems of not being able to adapt to different requirements of valve lift, and achieve the effects of improving inflation efficiency, avoiding resonance, and improving power performance

Active Publication Date: 2011-05-25
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, only one cam profile is designed for one valve, and the lift and valve opening duration are fixed, which cannot adapt to the different requirements of the engine operating conditions on the valve lift.

Method used

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  • Automobile engine air distribution cam suitable for variable two-stage air valve lift
  • Automobile engine air distribution cam suitable for variable two-stage air valve lift
  • Automobile engine air distribution cam suitable for variable two-stage air valve lift

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Experimental program
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Embodiment Construction

[0019] see figure 1 , figure 2 , image 3 and Figure 4 , two high-lift cams 1, 2 and one low-lift cam 3 are designed for one valve, and the low-lift cam 3 is arranged between the two high-lift cams 1 and 2. The angle between high-lift cams 1 and 2 and low-lift cam 3 is 18°, the maximum deviation of valve lift is less than ±0.05mm, the width of high-lift cam is 7.1mm, and the width of low-lift cam is 9.2mm. The radius of the base circle 5 of the high-lift cam is different from the radius of the base circle 4 of the low-lift cam, the radius of the high-lift base circle is 17.745mm, and the radius of the low-lift base circle is 16.61mm.

[0020] see Figure 5 and Figure 6 , the two cam buffer sections are designed differently according to the structural needs, the height 6 of the buffer section of the high-lift opening section is 0.42mm, the opening speed is 0.01mm / deg, the height 7 of the buffer section of the closing section is 0.52mm, and the closing speed is 0.02mm / de...

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Abstract

The invention discloses an automobile engine air distribution cam suitable for variable two-stage air valve lift. An air valve is provided with two high-lift cams and a low-lift cam, and the low-lift cam is arranged between the two high-lift cams; and the molded lines of the cams are specially designed. The width of the high-lift cams is 7.1 millimeters, the width of the low-lift cam is 9.2 millimeters, the low-lift cam advances for 18 degrees compared with the high-lift cams, and the maximum lift deviation of the two-cam air valve is less than +/-0.05 millimeter; the base circle diameter of the high-lift cams is different from that of the low-lift cam; and the buffer sections of the two cams are respectively designed as follows: the height of the buffer section of the high-lift opened section is 0.42 millimeter, and the height of the buffer section of the closed section is 0.52 millimeter. The high and low cams are switched under different working conditions to meet the requirement for different air valve lift under different working conditions and improve the dynamic property, economic efficiency and discharge property of an engine.

Description

technical field [0001] The invention relates to a part structure of an internal combustion engine, in particular to a cam and its profile suitable for two-stage variable valve lift. Background technique [0002] The valve cam of the automobile engine makes the valve open and close in time according to a certain working sequence and valve phase, and ensures that the valve has sufficient lift. The design of the cam directly affects the power, economy and noise of the engine. The high-speed moving cam is subject to the periodic impact load of the intermittent opening of the valve. Therefore, not only the cam surface is required to be wear-resistant and the camshaft must have sufficient toughness and rigidity, but also the dynamics and dynamics of the valve system must be ensured when designing the cam profile. The kinematics results are superior, so as to ensure that the engine valve train works normally, the noise is small, and the reliability and durability are improved. Us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/08
Inventor 林灵詹樟松蓝军张晓宇王茂辉
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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