1Bear the measurement of the hole
Bear measuring and can use the internal diameter scale to measure after checking the basis size on the outside micrometer of the hole, still need to measure round degree and cylinder degree which bear the hole at the same time. Burn out bearing make, bear hole open the intersection of place and diameter dwindle and round degree ultra and poor often, the normal work to the bearing is extremely unfavorable. If connecting rod localization of bolt Taxi cooperation loose and vast, connecting rod bearing build, will shift, make, bear the intersection of hole and round degree to be ultra and poor. The bearing should be controlled within dimensional tolerance while bearing the round degree of errors of the hole, but cylinder degree should be controlled strictly.
2Measurement of the bearing main size
Bearing thickness: Fixing outside micrometer and examining the head is changed system into the sphere by the level, can be used for measuring the bearing thickness. The intersection of bearing and thickness generally should control within the range of 0.005~0.010 millimetres, will enable ultra difference of internal diameter of the bearing. Bearing in near to open one’s mouth have trace make a reduction of thin, should notice at the time of measurement.
The bearing and tight degree of cooperation which bears the hole: It is to play turning on amount and a height of mine to guarantee to cooperate urgent degree by the freedom of the bearing. Measure it under a high-level method of mine: Install and shut the bearing according to the regulation, hand in the bearing to cover on the bolt and fasten after the fixed torsion to unclamp a bolt among them, measure the bearing and cover the interval of the interface by filling in chi, its value should be within range of 0.05~0.15 millimetres.
Bearing internal diameter: Need to hold the bearing according to the regulation to amalgamate and tighten the bearing to cover on the bolt according to the fixed torsion before measurement, use the internal diameter scale, check the basis size on the outside micrometer, measure, avoid reducing the thin district at the time of measurement. Bearing internal diameter and difference of the size of external diameter of corresponding to the journal are to cooperate with the interval.
Co-axle degree of the main bearing inner hole: Mainly it bore one degree of errors of hole co-axle to cause in one degree of errors of co-axle of the main bearing inner hole, and bear the deformation that the reason that one degree of errors produces of the hole co-axle is the cylinder block. When the radial round of main journal beats in the fixed public errand, check the eating and shutting the impression of main journal and bearing, if it is obviously inconsistent to eat and shut the position of impression every main bearing, prove one degree of errors of co-axle is great, can adopt the method of scraping, boring and paring the bearing or changing the cylinder block etc. to solve, otherwise it is difficult to guarantee the engine works normally.
