Wear Measurement on Chain Joint Components Using a Roundness Instrument

Abstract

Abstract

Precise Friction Measurement in Drive Chains Using a Chain Joint Tribometer

“…Irregularities are mainly visible on the chain sleeves B and C. However, the deviations are of a very similar order of magnitude, which is why no clear statement can be made here about the friction behavior. As previous measurements have shown, wound bushes show a clearly large contour deviation, for example at the sheet joint gap [24,25,43]. Further investigations can help to differentiate between differently manufactured sleeves and to improve the understanding of the friction behavior.…”

“…These parameters allow conclusions to be drawn about the interactions within the tribological system, such as how the wear processes change the component surfaces after defined operating times. Additional information on the measuring methods can be found in [24,25,35,42,43].…”

Timing chain wear investigation methods: Review

“…From the change of the distance, the total elongation of the chain or its projection on a single joint can be calculated [15]. Other chain elongation measuring devices are also used that grip only a segment of the chain and measure it in a prestressed state [29], [32]. The result can then be projected to full chain elongation [35].…”

“…The result can then be projected to full chain elongation [35]. More detailed information can be obtained using tactile measurement of the pins and the bores of the bushes [13], [29], [35], but this is quite timeconsuming and can only be achieved at the cost of final disassembly and destruction of the chain, so it is not suitable for wear monitoring during a test. Field tests are usually infrequent, as they test the complete product under real operating circumstances.…”

“…The chains are usually tested in pairs, mounting two chains at a time at the sprockets placed on the ends of the driving and the driven shafts (see Figure 4). Tensioning can be realized by moving one of the shafts [42], [43], rotating the two sprockets on the driven shaft relative to each other [29]9, [31], [35], [37], or by synchronous use of two electric motors when one motor drives and the other one brakes through the chains [31]. The main difference between the methods is that both spans of both chains are tight when having a steady force on the movable shaft (Figure 4/a), while one span of each chain will be tight and the other will have a slack by rotating the sprockets relative to each other (Figure 4/b) or using two synchronized electric motors (Figure 4/c).…”