2.2.26. Check of a bent shaft

Using the indicator of hour type, measure a beating of the central radical neck of a bent shaft. Rotate a bent shaft slowly. If the beating exceeds extreme value, replace a bent shaft.

Fig. 2.164. Check of a beating of a bent shaft

Extreme value of a beating: 0,04 mm.

At measurement of size of an axial free wheeling the bent shaft has to be installed in the block of cylinders as usual, that is the persistent bearing 1 and covers of radical bearings have to be on the places.

Fig. 2.165. Persistent bearing

Nominal thickness of the persistent bearing of a bent shaft: 2,470–2,520 mm.

The increased size of 0,125 mm: 2,533–2,583 mm.

Gradually tighten bolts of a cover of the bearing No. 1 1-10 and a cover of the bearing No. 2 11-20 as follows.

Fig. 2.166. Order of tightening of bolts of fastening of covers of bearings No. 1 and No. 2

Tighten bolts 1–10 moment of 30 N · m in the order specified in the figure 2.166.

In the same way, as well as when performing operation (1) tighten bolts the moment of 50 N · m.

In the same way, as well as when performing operation (1), tighten bolts on 60 °.

Tighten bolts 11–20 moment of 22 N · m in the order specified in the drawing.

Bolt of fastening of a cover of the radical bearing of a bent shaft No. 1 (1-10): tighten the moment 30 N · m, 50 N · also tighten m on 60 °

Bolt of fastening of a cover of the radical bearing of a bent shaft No. 2 (11-20): tighten the moment 22 N · m.

Fig. 2.167. Measurement of axial shift of a bent shaft

Use the indicator of hour type for measurement of shift in the axial direction of a bent shaft.

If the result of measurement exceeds extreme value, replace the persistent bearing new the nominal size or the increased size to normalize an axial gap.

Nominal rate: 0,11–0,31 mm.

Extreme value: 0,35 mm.

NOTE After check of an axial free wheeling, make sure that deformation of bolts of a cover of the bearing No. 1 does not exceed extreme value.

Fig. 2.168. Measurement of diameter of a neck of a bent shaft: "A" - "B" – ovality; "a" - "b" – conicity

Unevenness of wear of a neck of a bent shaft is determined by a difference of diameters in cross section or by section length. This difference is determined by indications of a micrometer. If any of radical necks of a bent shaft has damages or traces нерав№ного wear, that is, excess of extreme value takes place, to a proshlifuyta a neck or replace a bent shaft.

Extreme value on ovality and conicity of 0,01 mm.