What are the differences between cylindrical bearing shells and elliptical bearing shells? What are they used for?
Thread Content
As the title suggests: what are the differences between cylindrical bearing shells and elliptical bearing shells? What are they used for? Why are there separate cylindrical bearing shells and elliptical bearing shells?
With different rotational speeds and loads, the main difference is that the elliptical bearing shells can form an oil wedge more effectively.
Cylindrical tiles: Can only form one oil wedge, and are commonly used in low-speed, high-load applications. Elliptical wafers: Can create two oil wedges, and are commonly used in applications with high speeds (fast enough to generate oil wedges) and moderate loads. Sliding bearing shells are classified by load (from heavy to light): cylindrical bearings → elliptical bearings → four-lip bearings (four oil wedges) → five-piece tilting bearings. By speed (low to high): cylindrical bearing shells → elliptical bearing shells → four-lip bearings (four oil wedges) → five tilting bearing shells.
Could you draw a sketch to illustrate it? Thank you!
How to measure the gap between five tilting tiles? Please give some advice.
The clearance of the bearing shells can be measured using five tiles, through methods such as lifting the shaft, lifting the tiles, or using lead compression. When measuring using the shaft-lifting method, the actual value = measured shaft-lifting height (displayed value) / 1.1 ； The minimum average gap x1.1 for the tile-lifting method and the lead-pressing method = actual value.
The shaft-lifting method is still the most commonly used; the lead wire compression method requires multiplying by a factor of 1.1, which is rather cumbersome, so it is used less frequently. It can be used in two ways to compare and verify whether the measurement values are accurate
When using the shaft-lifting method, if there is a gauge on the shaft, should there also be a gauge placed on the bearing housing? Prevent errors from occurring. That is, the reading on the gauge on the shaft during measurement – the reading on the gauge on the bearing housing. Then divide by the 1.1 coefficient.