Bearings circumferential grooved

WOOLACOTT, R.G. and MACRAEP. The performance at high speeds of complete plain journal bearings with a circumferential groove oil inlet, NEL Report No 338,... 

A journal is supported by two two-lobed bearings, and is driven by an electric motor with speed controller. The test bearing, a circumferentially grooved journal bearing with 100mm diameter, 25mm each land length and 108.5um radial clearance, is mounted at the end... 

A study has been made of the effect of partial circumferential grooving at the downstream end of the load bearing oil film of a circular profile journal bearing. The design is simple and easy to manufacture accurately and posseses the following attributes ... 

This paper gives a comparison of theoretical and experimental orbits of a dynamically loaded journal bearing having a pressurised oil supply to a central 360° circumferential groove. The results of two theoretical analyses are presented Methods A and B. Method B, referred to as the Reaction Method, features oil film force prediction by means of pre - computed velocity coefficients, thus facilitating quicker computation. Satisfactory correlation of the experimental results with the predictions of both theoretical methods is shown. Comparisions are made for three examples including different relative phase and amplitude of the excitation components at both once and twice rotational frequency. 

Alignment between the journal and bearing was maintained for all conditions covered in this paper, and the bearing featured a pressurised oil supply to a centrally positioned full circumferential groove. Both theoretical methods took account of journal inertial forces, and Method A had an optional facility for modelling oil film history. 

The results given in this paper are for an aligned 360 circumferential groove bearing. For this type of bearing, the... 

Table P-12 compares important design parameters of conventional and new bearing design for back-to-back gears. The general design of the bearing is shown in Fig. P-48. The circumferential groove is important for reduction of thermal deformations due to temperatiu-e gradients over the face width of the bearing.

Since the exact shape of Che starting line is a function of bearing shape, the manner of lubricant delivery, and the oil groove geometry, it is not considered here and Che fluid film is assumed to start at a constant circumferential position. 

Recently, Ono et al. (6) analyzed the dynamic properties of a Journal bearing with a circumferential oil supply groove for the equivalent flow model. Since they employed perturbation method in the calculation of the dynamic coefficients, their result corresponds to FC in this paper. 

To make the plain cylindrical bearing practical for oil or other liquid lubricants, it is necessary to modify it by the addition of grooves or holes through which the lubricant can be introduced. Sometimes, a single circumferential... 

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