Gear tooth damage is lighter than 138 gears. There are also sag marks on the top of the tooth from the middle to the small head about 3mm, but the dent is shallow, about 0.1-0.3mm, and there are also squeezed depressions on the tooth surface. The material that is pressed toward the tip of the tooth at the tip of the tooth forms a sharp excess. Two E704 bearings are mounted on the 138 gear shaft, and a distance sleeve of 8 mm width is installed between the inner rings of the two bearings. Due to the breakage of the cage, the bearing is loosened during the disassembly and the steel ball falls out. Five cage wrecks found in the cavity of the accessory drive: one with two ball pockets, both ends broken from the rivet holes on the cage lintel, and the rivets of the traverse between the two ball pockets There is also a broken rivet in the hole; the other two have only one pocket and both break from the rivet hole of the cage; there are two small wrecks, the length is 3~4mm, one of which has been It is pressed into a curved sheet. Another E704 bearing away from the gear end, but the rotation is not very good, no other problems were found. a. Two E7000105 bearings mounted on the 7717 gear shaft, no problems were found after inspection. b. Check the oil return pump of the Shanghai self-priming pump accessory transmission ,, and found that the wall of the return pump casing is seriously scratched and can no longer be used and scrapped. No fault was found in the return pump gear. c. Fuel-slide accessory SRC-19C, in the oil return filter, many small pieces of metal chips are poured out, some of which are pressed into curved sheets.
Due to the serious damage of the bearing cage failure condition, the initial failure residue can not be found, but can be analyzed according to the fault condition. The analysis of the faulted parts shows that the obvious dents of the 138 and 7717 gears in the middle of the tooth tip and the tooth surface are caused by the crushing of the bearing cage into the gear. The main basis of the analysis is as follows: First, since the cage of the gear end bearing has completely broken off, the width of the tooth recess is substantially consistent with the width of the cage; second, the wreckage of the partial cage is pressed into the shape of the curved sheet; From the assembly position of the centrifugal ventilator, the 138 gear position is below, and the E704 bearing position is on. When the cage is detached, the wreckage will naturally fall into the bevel gear. E704 bearing is a single row deep groove ball bearing (formerly known as radial ball bearing), which is composed of ferrule, steel ball and cage.
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