After disassembling the double transformer oil filter, it was found that its barrel was intact and the upper cover was damaged. The fracture surface is basically straight and perpendicular to the bolt axis. The fracture has no obvious plastic deformation. The two fractures of the broken bolt can be matched up and down, indicating that the bolt has high hardness.

(1)分析螺栓斷口

(1) Analysis of bolt fracture

螺栓正確安裝后，其螺紋連接處的1扣大約承受25%的總載荷，第2扣承受19%的總載荷，因此60%~65%螺栓斷裂均位于螺紋連接處1扣的根部。該雙變?yōu)V油器螺栓的斷裂就是發(fā)生在1扣螺紋根部，由此可知螺栓1扣螺紋位置確實(shí)承受了較大的載荷，載荷過(guò)大是引起螺栓斷裂的主要原因。小型裝載機(jī)

After the bolt is correctly installed, one buckle at the threaded connection bears about 25% of the total load, and the second buckle bears 19% of the total load. Therefore, 60% ~ 65% of the bolt fractures are located at the root of one buckle at the threaded connection. The fracture of the bolt of the double transformer oil filter occurred at the root of one thread. Therefore, it can be seen that the position of one thread of the bolt does bear a large load, and excessive load is the main reason for the fracture of the bolt. Small loader

(2)分析螺栓斷裂面

(2) Analysis of bolt fracture surface

我們從螺栓的斷裂面發(fā)現(xiàn)，該斷裂面形成的區(qū)域非常明顯，可清楚看到疲勞裂紋源、疲勞擴(kuò)展區(qū)和脆性斷裂區(qū)。據(jù)此分析認(rèn)為，螺栓長(zhǎng)期承受預(yù)緊力和雙變?yōu)V油器內(nèi)油液脈動(dòng)沖擊的交變載荷，在疲勞裂紋源處產(chǎn)生裂紋，并向疲勞斷裂區(qū)延伸。當(dāng)剩余部分不足以承擔(dān)預(yù)緊力及交變載荷時(shí)，終會(huì)導(dǎo)致螺栓發(fā)生斷裂。小型裝載機(jī)

The fatigue crack source and brittle fracture surface can be seen clearly. According to the analysis, the bolt bears the alternating load of preload and oil pulsation impact in the double variable oil filter for a long time, and the crack first occurs at the fatigue crack source and extends to the fatigue fracture zone. When the remaining part is insufficient to bear the preload and alternating load, the bolt will eventually break. Small loader

(3)確定斷裂原因

(3) Determine the cause of fracture

以上分析，雖然可以確定螺栓是由于疲勞斷裂引起，但是不能確切得出引起疲勞斷裂的原因。我們檢查了多個(gè)螺栓斷裂的雙變?yōu)V油器，對(duì)螺栓斷裂面研究后發(fā)現(xiàn)，不論哪個(gè)位置的螺栓斷裂，螺栓斷裂的疲勞裂紋源總是位于筒體近心端，疲勞擴(kuò)展區(qū)、脆性斷裂區(qū)總是位于筒體遠(yuǎn)心端。

Through the above analysis, although it can be determined that the bolt is caused by fatigue fracture, the cause of fatigue fracture cannot be determined. We checked several double variable oil filters with broken bolts. After studying the bolt fracture surface, we found that no matter where the bolt is broken, the fatigue crack source of bolt fracture is always located at the proximal end of the cylinder, and the fatigue growth zone and brittle fracture zone are always located at the distal end of the cylinder.

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