How to choose crankshaft bearings
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How to choose crankshaft bearings
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When replacing the bearing; it is necessary to select the bearing; the skill requirements of the matching are as follows: (l) Select the bearing according to the journal. According to the grinding scale of the crankshaft; the same grade of bearing is selected.
(2) Bearing length rules. The new bearing is installed in the hole of the seat; each end of the upper and lower pieces should be higher than the plane of the bearing seat 0. 03 ~ 0. 05mm. To ensure that the bearing and the seat hole are closely fitted;
The experience of viewing the bearing length is: install the bearing. Install the bearing cap; tighten one end bolt according to the regular torque value; between the other end cover and the bearing seat plane, the thickness of the gasket is 0. 05mm; when the torque of the end bolt is 10~20N0é¹ ; Can not extract; clarify the length of the bearing is suitable for the edge gasket can be extracted; clarify that the bearing length is too long; the end of the non-positioning bulge should be lowered, if the gasket is not screwed to the regular torque value, the bearing is too short; Should be selected from the beginning.
(3) The reverse lubrication is good. The reverse side of the bearing should be free of mottle; the surface roughness Ra is 0. 8μm; the meditation can prevent the bearing from changing; the positioning effect; if the meditation is too low; the height can be rushed out by the sharp milling; if the zen is damaged; the bearing should be selected from the beginning .
(4) The elasticity is suitable and there is no dumb sound. After the new bearing is placed on the bearing seat; the radius of curvature of the required bearing is larger than the radius of curvature of the seat hole; when the bearing is installed in the seat hole; the elastic force of the bearing itself and the bearing seat hole can be tight Fit; to facilitate heat dissipation. Check whether the bearing has a dumb sound; it can be tapped on the opposite side of the bearing to check; there is a dumb sound to clarify that the alloy is not in good contact with the bottom plate; it should be selected from the beginning.
(5) The cooperation gap between the bearing and the journal should be appropriate. When selecting a bearing, it is necessary to check the cooperation gap. When viewing; the cylinder table and the micrometer measure the bearing and the journal; the difference is the cooperation gap. The experience of the cooperation gap of the bearing is as follows: about the connecting rod bearing; a thin layer of oil on the bearing, will be connected The rod is mounted on the corresponding journal; tighten the bolt according to the regular torque value; then swing the connecting rod by hand; can change 1~1/2 turn; pull the connecting rod along the axis direction; no gap feeling. That is, in line with the demand, about the main bearing; oil on each journal and bearing surface; tighten the bolt according to the regular torque value; crank the crankshaft with both hands; The retardation image is suitable (6) The seat hole should be coaxial. The center line of each main bearing should be on the same axis. The way to view is to check the gap of the main bearing; remove the main bearing cover; lift the crankshaft View the touch parts of each bearing should be common to each other; if the touch conditions are not common; but the difference is not big; can be repaired, if the difference is too large; or one bearing piece does not touch; the other piece is too heavy; should be from scratch View the coaxiality of the main bearing housing bore or select the bearing from the head
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