Bearings and Bearing Metals: A Treatise Dealing with Various Types of Plain Bearings, the Compositions and Properties of Bearing Metals, Methods of Insuring Proper Lubrication, and Important Factors Governing the Design of Plain Bearings

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Industrial Press, 1921 - Bearings (Machinery) - 120 pages

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Page 37 - A variation of 1 per cent. either way will be permissible in the tin, and .5 per cent. either way will be permissible in the antimony and copper. The use of other than virgin metals is prohibited. No impurity will be permitted other than lead, and that not in excess of . 25 per cent.
Page 95 - The longer the rubbing surfaces remain in contact, the greater is their friction. 4. Friction is, in general, proportional to the force with which the rubbing surfaces are pressed together, and is commonly equal to between one half and one quarter of that force. 5. Friction is not generally increased by augmenting the rubbing surfaces. 6. Friction is not increased by an increase of velocity ; at least it is not generally so ; and, in some cases, even decreases with an increase of celerity.
Page 1 - BEARINGS BEARINGS may be divided into two general classes: journal bearings and thrust bearings. In the journal bearing the load acts at right angles to the axis ; such bearings are also termed radial bearings. In the thrust bearing, the load acts parallel to the axis. Bearings may also be divided into two classes according to the manner in which the bearing surfaces are in contact with each other. Ordinary bearings have a sliding contact, whereas ball and roller bearings have a rolling contact.
Page 37 - No impurity will be permitted other than lead, and that not in excess of . 25 per cent. NOTE: This grade of babbitt is special owing to the large amount of copper contained therein. It is used for the connecting-rod linings of motor bearings, or any service where machinery designers are confronted with severe operating conditions.
Page 43 - An alloy of 80 per cent, copper, 10 per cent, tin, and 10 per cent, lead...
Page 29 - ... greater strength than the metal alone would have, etc. Alloys melt at a lower temperature than do the component metals and hence may be employed for solders, fusible plugs, etc. In view of the many engineering uses of alloys, their study is one which is well worth the time of the chemical engineer. BEARING METALS Bearings are usually composed of alloys of copper, lead, tin, antimony and zinc, and are known as Babbitt metal, white metal, brass, phosphor bronze, etc., and by various trade names....
Page 111 - Each section is 5 ft. 2 in. long; the adjacent sections are coupled together by means of a flexible leather disk or two straps connecting the two flange couplings. The flexible couplings prevent transmitting any part of the load applied on one shaft to either adjoining section, and also prevent binding between shafts and bearings due to possible lack of alignment.
Page 43 - ... in both rods and cross heads are to be semicylindrical. Connecting rods and main links must be provided with boxes lined with Babbitt metal, hammered in after being poured. The composition of the Babbitt metal shall be 85 per cent tin, 10 per cent antimony, and 5 per cent copper. Piston rods shall be packed with metallic packing, and valve stems with soft packing.
Page 111 - I-beam levers. The bearings and hangers for each section are symmetrically placed with respect to the middle of the section ; therefore, equal loads on the intermediate bearings produce equal pressures on the end bearings. The...
Page 112 - All bearings were for the same size shaft and the same pieces of shafting were used for all the tests, except that two sections bent during the tests were replaced.

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