During the whole machine strengthening test of the mining loader, the chassis will have abnormal noise. The specific situation is: when the steering wheel is turned when the engine is running at idle speed, a part of the chassis will make a crisp metal impact sound, and it is uncertain where the steering wheel will make abnormal noise; When stepping on the accelerator to accelerate, the sound will become very weak or basically disappear.

根據(jù)該機(jī)故障現(xiàn)象和對(duì)其轉(zhuǎn)向系統(tǒng)結(jié)構(gòu)的分析，我們認(rèn)為其機(jī)架、轉(zhuǎn)向液壓系統(tǒng)、變速器出現(xiàn)故障的可能性非常小，該異響可能是來源于以下3方面：一是傳動(dòng)軸伸縮的時(shí)候會(huì)產(chǎn)生異響，二是主減速器和差速器出現(xiàn)異響，三是后橋擺動(dòng)架出現(xiàn)異響。

According to the failure phenomenon of the machine and the analysis of its steering system structure, we believe that the possibility of failure of its frame, steering hydraulic system and transmission is very small, and the abnormal sound may come from the following three aspects: first, the abnormal sound will occur when the transmission shaft is retracted, second, the abnormal sound of the main reducer and differential, and third, the abnormal sound of the swing frame of the rear axle.

1.排查傳動(dòng)軸

1. Check the transmission shaft

后橋在擺架上發(fā)生擺動(dòng)時(shí)，后橋的輸入法蘭也是會(huì)隨著后橋擺動(dòng)的，使后傳動(dòng)軸的長(zhǎng)度及空間位置發(fā)生改變。檢查發(fā)現(xiàn)裝載機(jī)在轉(zhuǎn)向過程中，后傳動(dòng)軸并不會(huì)有明顯的伸縮，該處不會(huì)存在異響可能性。

When the rear axle swings on the swing frame, the input flange of the rear axle will also swing with the rear axle, changing the length and spatial position of the rear transmission shaft. It is found that during the steering process of the loader, the rear transmission shaft will not expand significantly, and there will be no possibility of abnormal noise.

2.排查主減速器和差速器

2. Check the main reducer and differential

在后驅(qū)動(dòng)橋的輪邊減速器位置用手觸摸能感覺到有撞擊動(dòng)作。我們更換了主減速器和差速器總成，經(jīng)試機(jī)異響問題仍然沒有。

At the wheel reducer position of the rear drive axle, you can feel the impact action by touching it with your hand. We have replaced the main reducer and differential assembly, but the problem of abnormal noise still hasn't been solved after test.

3.檢查后橋擺架

3. Check the rear axle swing frame

為了模擬異響時(shí)候的工狀，并可以實(shí)時(shí)在觀察前、后擺動(dòng)架的實(shí)際運(yùn)行情況，我們會(huì)把該裝載機(jī)開到檢修平臺(tái)上。通過多次原地轉(zhuǎn)向、進(jìn)退行駛試驗(yàn)，仔細(xì)觀察擺架狀態(tài)，發(fā)現(xiàn)后擺動(dòng)架與橋殼之間存在3mm的相對(duì)竄動(dòng)。正是由于后連接法蘭在后擺動(dòng)架存在竄動(dòng)，引發(fā)了后擺動(dòng)架與后橋殼上的連接法蘭的相互撞擊，從而產(chǎn)生異響了。

In order to simulate the working state in case of abnormal noise and observe the actual operation of the front and rear swing frames in real time, we will drive the loader to the maintenance platform. Through many in-situ steering, forward and backward driving tests and careful observation of the swing frame state, it is found that there is a 3mm relative movement between the rear swing frame and the axle housing. It is precisely because of the movement of the rear connecting flange on the rear swing frame that the rear swing frame collides with the connecting flange on the rear axle housing, resulting in abnormal noise.

當(dāng)找到異響發(fā)生位置后，我們分析產(chǎn)生該間隙的原因。查看后橋圖紙，并從后橋的供應(yīng)商那里得到了相關(guān)情況。該型裝載機(jī)后橋橋殼與后擺動(dòng)架的理論設(shè)計(jì)間隙為1.1～2.15mm，安裝時(shí)的調(diào)整墊片只有厚度為6mm的1種規(guī)格。

After finding the location where the abnormal sound occurs, we analyze the cause of the gap. Check the rear axle drawing and get the relevant information from the supplier of the rear axle. The theoretical design clearance between the rear axle housing and the rear swing frame of this loader is 1.1 ~ 2.15mm. During installation, the adjusting gasket has only one specification with a thickness of 6mm.

實(shí)際拆檢出現(xiàn)異響的這臺(tái)裝載機(jī)，測(cè)量其調(diào)整墊片厚度只有5.1mm。再加上設(shè)計(jì)間隙，總共累積成了3mm的間隙

The thickness of the adjusting gasket of the loader with abnormal noise during the actual disassembly and inspection is only 5.1mm. In addition to the design gap, a total of 3mm gap is accumulated

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