Crankshaft oil hole structure for improving torsional fatigue strength of crankshaft and processing method
A technology of torsional fatigue and crankshaft oil hole, applied in the crankshaft and other directions, can solve the problem of not meeting the requirements of the crankshaft strength, reducing the torsional fatigue strength of the crankshaft, etc., to achieve reasonable structure, improve the torsional fatigue strength, and reduce torsional stress concentration. Effect
Inactive Publication Date: 2016-09-21
TIANRUN IND TECH CO LTD
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Problems solved by technology
This oil hole structure reduces the torsional fatigue strength of the crankshaft, which cannot meet the requirements of modern engine development for the strength of the crankshaft
Method used
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[0013] From figure 1 , figure 2 It can be seen from the figure that a crankshaft oil hole structure improves the torsional fatigue strength of the crankshaft. A main shaft straight oil hole 1 is drilled in the center of each main journal; a connecting rod straight oil hole 2 is drilled 5mm below the center line of each connecting rod journal. ;The straight oil hole 1 of the main shaft and the straight oil hole 2 of the connecting rod are perpendicular to the plane defined by the axial center line of the main journal and the connecting rod journal, and the diameter of the straight oil hole 1 of the main shaft is the same as that of the straight oil hole 2 of the connecting rod; The main shaft straight oil hole 1 on the upper shaft communicates with the connecting rod straight oil hole 2 on the adjacent connecting rod neck through a slanted oil hole 3, and the slanted oil hole 3 is located corresponding to the axial center line of the main journal and the connecting rod neck. ...
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The invention relates to a crankshaft oil hole structure for improving the torsional fatigue strength of a crankshaft and a processing method. A spindle straight oil hole is drilled in the central part of each main journal; a connecting rod straight oil hole is drilled 5mm beneath a center line of each connecting rod neck; each spindle straight oil hole and each connecting rod straight oil hole are perpendicular to a plane defined by axial center lines of the corresponding main journal and the corresponding connecting rod neck; the spindle straight oil hole in each main journal communicates with the connecting rod straight oil hole in the adjacent connecting rod neck through an inclined oil-hole; and each inclined oil-hole is located in a plane defined by axial center lines of the corresponding main journal and the corresponding connecting rod neck, and penetrates through a crank arm. The crankshaft oil hole structure for improving the torsional fatigue strength of the crankshaft provided by the invention is reasonable in structure, the stress concentration in the inclined oil-holes of connecting rods is greatly reduced, and the torsional fatigue strength of the crankshaft is improved. A tool for drilling the inclined oil-holes can enable the inclined oil-holes to be more accurate in positioning and positioning, and is simpler and more convenient to operate.
Description
technical field [0001] The invention relates to an engine crankshaft, in particular to a crankshaft oil hole structure and a processing method for improving the torsional fatigue strength of the crankshaft. Background technique [0002] The crankshaft is one of the most important parts in the internal combustion engine, and its strength is directly related to the reliability of the whole machine. Crankshaft failure modes mainly include bending fatigue failure and torsional fatigue failure. In recent years, with the development of internal combustion engines towards high power density, the volume of internal combustion engines has been continuously reduced and the power has been continuously increased. Some have reached 18-22MPa, far exceeding the traditional The internal combustion engine power of 8-12MPa, the ratio of torsional fatigue failure in crankshaft failure gradually increases accordingly. Therefore, higher requirements are placed on the torsional fatigue strength ...
Claims
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IPC IPC(8): F16C3/14
CPCF16C3/14
Inventor 丛建臣孙军倪培相于海明宋文友
Owner TIANRUN IND TECH CO LTD