Cam with symmetrical profile lines
A shape and symmetrical technology, applied in the field of internal combustion engine parts, can solve the problems of unsatisfactory emission performance, high exhaust temperature, loud noise, etc.
Inactive Publication Date: 2010-10-20
DONGFENG CHAOYANG DIESEL ENGINE
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Problems solved by technology
At present, a certain type of diesel engine camshaft is installed on a naturally aspirated engine, and there are certain defects when installed on a supercharged diesel engine, mainly because the emission performance cannot meet the requirements well, and the noise is large, and the exhaust temperature is high.
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[0007] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and examples. Symmetric profile cams include intake cams and exhaust cams. The specific parameters of the two cams are: intake cam working section 1-1 is 54.2°, intake cam transition section 1-2 is 25°, intake cam circle The radius of the arc section 1-3 is 20.6±0.0625mm, the overall height of the intake cam profile 1-4 is 48.09±0.05mm, and the centerline of the intake camshaft keyway 1-5 is 3.5°. The working section 2-1 of the exhaust cam is 60.5°, the transition section 2-2 of the exhaust cam is 29°, the radius of the arc section 2-3 of the exhaust cam is 20±0.0625mm, and the overall height of the exhaust cam profile 2-4 is 47.916±0.05mm, the exhaust camshaft keyway centerline 2-5 is 107.5°. The first cylinder air intake lobe and the second, third, and fourth cylinder air intake lobe are separated by 90°, 180°, and 270° respectively. The sep...
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The invention relates to a cam with symmetrical profile lines, comprising an intake cam and an exhaust cam. The angle of the working section of the intake cam is 54.2 degrees, the angle of the transition section of the intake cam is 25 degrees, the radius of the arc section of the intake cam is 20.6 mm, the overall height of the profile of the intake cam is 48.09 mm, the angle from the central line of the intake cam to the central line of a key slot is 3.5 degrees, the angle of the working section of the exhaust cam is 60.5 degrees, the angle of the transition section of the exhaust cam is 29 degrees, the radius of the arc section of the exhaust cam is 20 mm, the overall height of the profile of the exhaust cam is 47.916 mm, and the angle from the central line of the exhaust cam to the central line of a key slot is 107.5 degrees. The performance indexes of a diesel engine are improved by improving the profile line of the cam. The rated power of a test diesel engine is 103Kw / 2800r / min, and the power is raised from 88Kw to 103Kw at the same rotating speed; the torque is raised from 343N.m to 385N.m at the same rotating speed and the fuel consumption rate under the rated power is less than or equal to 245g / (Kw.h). Accordingly, the cam with symmetrical profile lines obviously improves the performance of the diesel engine.
Description
technical field [0001] The invention belongs to internal combustion engine components, and in particular relates to the improvement of the cam profile in the diesel engine. Background technique [0002] During the working process of the diesel engine, the opening and closing movement of the valve is driven by the camshaft, and the reasonable design of the cam profile is related to the performance parameters of the diesel engine. Therefore, the cam not only determines the size of the time-section value of the valve, but also determines the loading and working conditions of the various components of the valve system. Therefore, the design of the cam shape must not only ensure the largest possible time-section value, but also make the distribution The gas mechanism works smoothly and reliably. Therefore, the four main parameters of the arc cam (the working section of the cam, the transition section, the radius of the arc section, and the overall height of the cam profile) can ...
Claims
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IPC IPC(8): F01L1/08
Inventor 郝付林
Owner DONGFENG CHAOYANG DIESEL ENGINE