The seizure resistance of aluminium-based materials for engine bearings

to fi\-c layshafts. Low circumfcrcntial speeds in the toothings and, therefore, low dynamic teeth forces as well as reduced noise result from the relatively small gca.r \vhccl5. Load Capacity Calculation of Spur Gears and Bevel Gears According to DIN 3990. H. G’inter and T. Htjsel, 1.. D. 1.-Z., I I I (.l) (1969) 2099218; 10 figs., 2 tables, 20 refs The German standard DIS 3990 covers the calculation method for the flank and root loadcarrying capacity. The treatment includes an explanation of the basic ideas of the calculation procedure and a representation of the starting solutions for the evaluations with their influencing parameters. The state of knowledge is still insufficient for the standardisation of some of the influencing parameters. Therefore, proposals are forwarded for these to enable the designer to estimate all influencing parameters in accordance with the experience gained by the gear manufacturers. It is shown how one can considerably simplify the general evaluation method for limited fields of application especially for design calculations. 4.3. Filtevs Centrifuge, Surface and Depth-type Filters. Anon., Izd. Luh. Tribology, zr (2) (1968) -j%qC,; 2.3 figs h review of equipment available 5. MATERIALS

_4ND WEAR

Materials for Tribology-1. Introduction. n. Scott, Tribology I (I) (1968) 14-16. This article outlines the series of articles intended to aid designers in the choice of materials. The articles deal with all types of materials and those design aspects in which tribology plays a significant part. Each article reviews material properties, applications and potential uses with the object of drawing the designer’s attention to the wide variety of materials available to solve any given problem Materials for Plain Bearings. P. T. Holligan, Tribology, I (I) (1968) 16-20; 8 figs., 2 tables, 6 refs. The article summarises the attributes and the common bearing shortcomings of materials, white metals, aluminum and coppcrbase alloys currently used. Load-carrying capacity, oil-film thickness, wear and corrosion resistance are discussed. These materials possess certain characteristics, technical and economic which are likely to offer the designer the best solution for many years yet despite the increasing competition from plastics and other special materials. Wenv, 13 (1969)

‘35-1.+3

The Seizure Resistance of Aluminium-based Materials for Engine Bearings. (; c. Pratt, Tribolop. I (2) (I@%) IO() I I -1, 13 figs., 3 tables. i ref. Of current engine bearing alloys only certain aluminium-based alloys approach whitt metal in compatibility or seizure resistance zo”‘& tin/aluminium and so/o zinc/aluminium arc outstanding in this respect but the al)sence of a soft phase in the latter restricts embeddability. ,\luminium/lead has outstanding compatibility, equal to that of white metal and offers a solution to the current engine bearing problem of high inertia loads and thin oil films. Plastic Bearing Materials. I’. T. Holligan, Tribology, I (3) (1968) 16% 172; g figs., 5 tables, ro refs. ,4 short review of the types of plastic materials suitable for plain bearings, their advantages, disadvantages and properties of use to the dcsigncr. Application of Hard Surfaces to Steel. Anon., Metalluvgia, 79 (471) (1969) I ~--II; I fig. .1 hard welding process which is both successful and economic and has unique advantages is described. It can produce surfaces which will withstand corrosion as well as abrasion, provide long life and has no pick up. It is claimed that the working surface of the reclaimed component will give at least three times the life of a new component. Examples arc quoted such as steel mill rollers. Bearing Steels. I,. E. Herm, Low alloy steels---l..‘i.l. Publ. 114. (1968) 97-103; IO figs., 7 refs. The paper describes the production of material for anti-friction bearings. Two types of steel, through hardening and carburizing arc considered; the heat treatment, properties, recent and future developments are discussed. Influence of Oxide Inclusions on Quality of l”/OC-l$o/OCr Bearing Steels. J. 1, Norwood and Ii. Cummings, Lo-w alloy steels-I.S.I. Publ. 114, (1968) ro5-rro; 7 figs., 3 tables, 4 refs. The paper discusses the effect of different steel-making variables on the bearing fatigue properties. The method of deoxidation has a direct influence upon the bearing fatigue properties. Vacuum degassing reduces the size of inclusions present and improves fatigue properties of aluminium-killed steels. For these steels only, a relationship exists between total length of B type inclusions and fatigue quality. Complex deoxidation using calcium-bearing deoxidants results in apparently cleaner steel, but it is detrimental to fatigue resistance