弹性流体静压轴承

ELASTO-HYDRAUSTATIC BEARING

The elasto-hydraustatic bearing is a new type of hydraustatic bearing. In action, it is similar to some conventional type of hydraustatic bearing The difference lies in the fact that in a Conventional hydraustatic bearing, the inside surface of the bearing shell must bs made to a certain configuration to prodvce the by dravstatic action. In this new type of bearing, the bearing shell is made to the form of a plain cylindrical bushing with a circumferential groove in the middle. (Fig 3-1) when the oil pressure is low, it will function as a plain sliding bearing. But when the pressure of oil is high, the bearing Shell, mostly made of some elastomer, will deform and the diameter of the bearing at the middle will be larger than the diameter at both ends. As is well known, this taper shaped bearing shell will have hydracstatic action, (Fig 3-2) Experiments show that the load carrying capacity of this kind of hrdravstatic bearing can be computed by the following empirical formula;W=0.12xDxL when the bearing bushing is made of metal, the outside of the bushing must be hollowed out(Fig3-3) to make it easier to deform.There are many advantage of this type of hydraustatic bearing. It is simple in form and very easy to make. When the pressure of the oil drops, it will foction as a plain bearing and hence is very safe and reliable. As there is no groove at the inside of the bearing shell, it will function as a squeeze film bearing under shock or vibrating load and has a high capacity.