How to check the oil clearance of the main bearing of the sprinkler?
the oil clearance of the main bearing of the sprinkler
How to check the oil clearance of the main bearing of the sprinkler?Install the main bearing to the cylinder block and the main bearing cap, and use the main shaft arm to tighten the main bearing cap bolts to the specified torque; use an inner diameter gauge to measure the inner diameter of the main bearing; bearing clearance main bearing inner diameter crankshaft main journal diameter; the main bearing of the sprinkler if the calculated value If the limit is exceeded, select the appropriate main bearing according to the inner diameter of the main bearing and the diameter of the crankshaft main journal to obtain the specified bearing oil layer clearance.
Measure with a plastic feeler gauge Thoroughly remove oil and dirt from the crankshaft main journal and each bearing surface; lightly cut the plastic feeler gauge shorter than the bearing width and place it axially on the crankshaft, the main bearing of the sprinkler avoiding oil holes;the main bearing of the sprinkler place the main bearing Install the bolts to the cylinder block and main bearing cap to the specified torque, do not rotate the crankshaft at this time.
Remove the main bearing cap and bearing, and measure the width of the plastic feeler gauge with the scale on the ruler. This width is the main bearing oil layer clearance.
The following methods can be used for the detection of bearing radial clearance: 1. Detection method of feeler gauge For bearings with larger diameter, the clearance is larger, so use a narrower feeler gauge to directly detect. the main bearing of the sprinkler For bearings with smaller diameters, the clearance is small, which is inconvenient to measure with a feeler gauge, but the side clearance of the bearing must be measured with a feeler gauge with appropriate thickness.
The bearing clearance detection by the press lead method is more accurate than the feeler gauge detection,the main bearing of the sprinkler but it is more troublesome. The aluminum wire used for testing should be soft, the main bearing of the sprinkler and the diameter should not be too large or too small. The ideal diameter is 1.5 to 2 times the gap. In practice, soft lead wire is usually used for testing. 8 j1 T9 c; x) ^ When testing, first open the bearing cover, select a lead wire with an appropriate diameter, cut it into 15~40 mm long pieces, put it on the journal and at the interface between the upper and lower bearings, and cover the bearing. Cover,
tighten the fixing bolts according to the specified torque, then loosen the bolts, remove the bearing cover, use a micrometer to detect the thickness of the flattened lead wire, the main bearing of the sprinkler and obtain the average value of the bearing top clearance. If the top clearance is too small, pads can be added to the joint surfaces of the upper and lower tiles.If it is too large, reduce the pad, scrape and grind or re-tiling. 4 ~1 + f3 q) Q2 T3 m Adjustment of bearing bush tightening force: In order to prevent the possible rotation and axial movement of the bearing pad during the working process, in addition to the interference and stop parts, the main bearing of the sprinkler the bearing pad must also use a bearing cover.
Compression, the measurement method is the same as the method of measuring head clearance. In addition to measuring the thickness of the soft lead wire,the main bearing of the sprinkler the bearing bush tightening force (represented by the amount of elastic deformation after compression of the bearing bush) can be calculated. Generally, the main bearing of the sprinkler the bearing bush pressing force is 0.02~0.04 mm.