Abstract
Hydrostatic bearings are superior in terms of their friction and load carrying characteristics when compared to contact based bearings, but non-usable in applications with non-constant curvature counter surfaces. A possible solution to this limitation is the introduction of deformable hydrostatic bearings components that cope with these required deformations. To reduce the required deformation of a single bearing pad, multiple pads can be connected through a so-called whiffletree support system. In this work, a symmetric whiffletree based hydrostatic bearing embodiment is introduced. A 2D quasi-static model is introduced that allows for determining the kinetostatic and path following properties of such a type of bearing. Design considerations are given regarding the joint rotational-, normal-, and shear stiffness of each individual joint, as well as basic bearing layout. The potential of a whiffletree suspended bearing is presented through the use of a case study.
Highlights
Hydrostatic bearings have the property of obtaining a high load capacity while maintaining low friction
Please note that any rigid connection members do not have a dimension in this work and do not effect the total design dimension. Both kinematic and kinetostatic performance of all three embodiments are presented in Figure 12(a) and (b)
A case study has been presented to show how the design model can be implemented, and what kind of performance can be expected by adding a whiffletree as bearing support
Summary
Hydrostatic bearings have the property of obtaining a high load capacity while maintaining low friction. One approach to design compliant hydrostatic bearings, is to design the support to be elastic This has been used to counter waviness of the counter surface,[2,3] to maintain load capacity when the bearing is tilted[4] or to function as an elastic pivot.[5] these type of supports are generally limited to small deformations in the order of the bearing film height.[2,6] This results in an absence of hydrostatic slider bearing use in applications with non-constant curvature counter surfaces. This work will focus on the design of a large deforming hydrostatic bearing able to follow a non-constant curvature counter surface
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