US1185220A - Method of forming reinforced bearings. - Google Patents

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W. H. LUHRS METHOD OF FORMING REINFORCED BEARINGS. APPLICATION FILED APR. 23, I915. 1,185,220

Patented May 30, 1916.

; Snow doc 77222 2am J7, [V2225 Witueooen iiITEI STATES WILLIAM H. LUI IRS. OF D 'E METHOD OF FORMING Specification of Letters-Patent. I

Application filed April 23.

To all whom it may concern:

Be it l(ll()\\'ll that I. 'umn'ii ll. Ltfuns. a citizen of the Inited States of America. residing at Detroit. in the county of 'ayne and State of Michigan. have invented certain new and useful Improvements in Methods of Forming Reinforced Bearings. of which the following is a specification. reference being bad therein to the accompanying drawings.

The invention relates to the manufacture of bearings which are provided with babbitted or soft metal wearing surfaces. and it is the object of the invention to reduce the cost of manufacture and at the same time to obtain a product which is more durable than those heretofore used.

In the construction of babbitted bearings it is usual to produce sufficient depth of the Babbitt metal to con'ipensate for wear. but in addition to this it is also usual to provide a much greater depth to increase the strength of the bearing. This is for the reason that the friction upon the bearing surface will tend to displace the metal in relation to the outer case and unless there is sufficient body to resist these stresses the liabbitt lining may become detached. thereby destroying the bearing. \Yith certain coir structions the babbitt is mechanically united to its holder by perforating the latter so as to form interlocking studs. but the union is an imperfect one and sooner or later the soft metal becomes loosened and is eventually destroyed. Thus to guard against such a result the depth of the soft metal is made greater than would be required for merely compensating for wear. 'ith the present invention I have obtained a greatly improved bearing. first. by reinforcing the soft metal with a rigid metal, such as steel, and second. by integrating the contacting surfaces of the soft and harder metal so that they becon'ie in effect. a unit. and the depth of the soft metal may therefore be restricted to that necessary for wear. L

In (cu-r ng out my improved process for Ili5"'.ilu\'[li 'ing bearings it is essentiaLfirst. m prepare the surface of the reinforcing metal so that it will beintegrated with the soft or Babbitt metal. This I preferably accomplish by subjecting the reinforcing metal to a series of treatments preliminary to a mn oi 'r. MICHIGAN REINFORCED vBEARINGS.

Patented name. 1916. 1915. sci-m1 No. 23.315. 7

tinning process by which the surface is coatwlwith metallic tin. After the tinning process the reinforcement is heated to a predetermined temperature. and the Babbitt metal is then cast thereupon. with a result that it will be completely molecularly united with the reinforcement and will become a unit therewith. i i

In the drawings. I have illustrated a few of the specific forms of bearing resulting from my process, in which Figure l is a perspective view showing one construction. and Fig. 2 a longitudinal section through a modified construction and Fig. 3 shows in longitudinal section the most simple form of the invention.

is the metallic reinforcement. preferably formed of sheet steel. pressed or otherwise fashioned into the desired form. This reinforcement is first treated by dipping the same in a solution of substantially the following composition: 100 pounds of IIIIIII? atic acid.l ounce of salamnroniac,cut with 2 ounces of aluminum. The reinforcement being first heated to a tempe atnre of 200 F.. is then plunged into this solution and is allowed to cool. The next-treatment is the immersing of the pre-heated metal in a solution composed of substantially: 100 pounds of muriatic acid. cut with 5 ounces of zinc. After immersing in this solution the bearing is again allowed to .cool. The next treatment is the immersing of the pre-heated metal in a solution composed of: 100 pounds of muriatic acid and 8 ounces of zinc. and

after witlnlrawing from the solution the pletely coated with tin. The reinforcement is then-permitted to cool, after which it is re-heated to substantially 450" F.. and is then assembled in proper position fof casting the Babbitt metal thereon.

-\s shown in Fig. 1. the Babbitt metal is cast so as to have a portion 1) extending parallel to the reinforcement A. and portions and extending around the end of said reinforcement. Thus the wearing. surface for both radial and end thrust is formed of the softer metal.

In Fig. 2 a modified construction shown. in which fianges ll are united to the tin sur face of the ends of the reinforcement A, and

the babbitt Eds cast to extend parallel to manufacture of arious specific structures.

'hat I claim as my invention is 1. The process of forming reinforced Bahhitt orsoft metalbearings. comprising the treatmentof the reinforcing metal to a series of acid baths having small proportions of metallic salts therein, the plunging of the metal after treatment into a molten tin bath. and the casting of the hahhitt upon the tin. surfaceto become molecularly united thereto.

2. The process of forming reinforced Babbitt or soft metal hearings, comprising the treatment of the reinforcing metal by first innnersiug in a bath of 'muriatic acid and aluminum salt, second. in in'unersing in a bath of muriatic 101d and zinc. salt, third;

in immersing in a bath of muriatic acid with a greater proportion of zinc salt. fourth, in innuersing in molten tin. and fifth. in casting the Bahbitt metal upon the tin surface to become molecularly united thereto.

3. The process of forming reinforced Rab bitt or soft metal hearings, comprising the treatment of the reinforcing metal to a'series of acid baths containing metallic salts. the plunging of the metal after treatment into a bath of molten metal. such as will molecularl unite withthe hahbitt. and the casting of the hahhitt upon the coated surface.

In testimony whereof I afiix my signature in presence of two witnesses.

' \VILLIAM II. LUHRS.

'itncsses:

JAMES l. lhmn Au'rmiu I). Prm'uu.

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