US2167311A

US2167311A - Method of abrading crankshafts

Info

Publication number: US2167311A
Application number: US164390A
Authority: US
Inventors: Postma Frank
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-09-17
Filing date: 1937-09-17
Publication date: 1939-07-25
Anticipated expiration: 1956-07-25

Description

July 25, 1939.

F. POSTMA METHOD OF ABRADiNG CRANKSHAFTS,

Filed Sept. 17, 1937 gnaw 141cm Z72: Pasfmw WQ/M/MW v Patented July 2s, 1939 ,z,1e1,a11"

METHOD or masonic onanxsnms roman, Bidsewood, N. .i. mama September 11, 1931, Serial no. 164,390

2 Claims. (Cl. sh-@218) This invention relates to a method of abrading 1 crankshafts, and has more particular reference to an improved method of abrading the journals of engine crankshafts for the purpose of ,truing and/or polishing such journals after they have become unevenly worn and scored from any cause such as continued operation of the engine with defective or.burned out bearing liners.

In truing and polishing the journals of engine 10 crankshafts, as heretofore practiced, it hasbeen necessary to completely remove the-crankshaft from t e engine and subject the crankshaft iour-.

nals ,to the action of grinding or lapping and/or polishing, tools forming part ofv a; separate anddistinct lapping and polishingmachine. While efi'icient, such prior methods were extremely slow andcostly;

My method provides for abrading the journals of an engine'crankshaft without removing the same from the engine andwhile operatively associated with the main bearings of the engine block and with the connecting rod bearings of the engine. I accomplish this by substituting thinabrading liners of the type shown in my co-pending U. S. application Ser. No. 164 filed September 17, 1937, now lgatent No. ,1 ated Dec. 27, 1938, for the bearing liners of the main and connectingjiod bearings of the engine, and rotating the engine crankshaft so as to subject the journals ofthe latter-tn the action of said abrading liners for truing and/or polishing said journals In this way, I am able to accomplish eflicient and accurate truing and polishing. of the crankshaftjournals under the actual conditions of engine operation and in an expeditious and economical manner. As is the case with ordinary bearing liners, the abrading liners consist of a pair of semi-cylindrical members adapted to seat against the bore of thebearing and having secured or bonded to their inner surfaces ,suitable granular abrading. material, such as emery or carborundum, which engages the crankshaft journal. The abrading liner sections are preferably of the same width or lengthas the 5 bearing block and its cap? and are seated in con- 'tacting relation with each other at their end or longitudinal edges. -As withbearing liners, the; abrading liners are preferably provided with means to assure retention of the same in the 50- correct positions with-respect to each other and the bearing and against turning with the crankshaft journal, such as cooperating elements of the abrading liners and the bearings. The abrade ing liner sections are preferably constructed'of 55 relatively. stiff and strong material, such as steel or other suitable metal, which will efiectively resist distortion and destruction during the abrading operation.

Other objects and features of the invention will become apparent from the following descfip- 5 tion when considered in connection with the accompanying drawing, in which:

, Figure 1 is a fragmentary sectional view showing an engine whose crankshaft bearings are provided with abrading liners for abrading the 10 crankshaftjournals in accordance with the present method.

Figure 2 is an enlarged fragmentary section taken on line 2-2 of Figural at one side of a connecting rod bearing; and l5 Figure 3 is an. enlarged perspective view of one of the abrading liner sections employed in carrying out the present method as shown in Figures Referring in detail to the drawing, 5 indicates 20 an engine cylinder block having pistons 6 reciprocable' in the cylinders thereof. As usual, the engine crankshaft I has a plurality :of spaced journals lmounted in bearings 9 ofthe engine block 5, and the cranksof said crankshaft have 25 journals l0 engaged in bearings 9w provided on the lower ends of connecting rods ll, to the upper ends of which the pistons 6 are attached. As is well known in the art, each of the bearings 9 and 9:: includes a half hearing or hearing block 30 integral with thecylinder block- 5 and the connecting rod H as respectively indicated at l2 .and lid, and a separate, half bearing Onbearing cap l3 and "a, detachably bolted as at l4; and

a tothe-bearing block I! andila, respectively. 5 i

As is also well known in the art, the bearings 9 and aa are usually provided with thin bearing liners which are seated loosely in the bearings and clamped therein by the bolts. or Illa by n which the several sections of the bearings are 40 clamped together. Each of these bearing liners usually consists oi! a pair of semi-cylindrical members composed of a thin outer shell adapted to s'eatsagainst the bore of thebearing and having bonded to its inner surface suitable anti-friction material which engages the crankshaft journal. The bearing liner sectionsare usualls the same width or length as the bearing and are seated vin contacting relation with each other at their' end or lqngitu a1 edges. In accorda oe with the present invention, the

bearing line s of the bearings 9 and 9a are re-.

' moved and abrading liners ccnforining in general size and shape to said bearing liners are substituted for. the latter,such abru'ding liners each consisting of a pair of semi-cylindrical members 15 composed of a thin outer shell adapted to seat against the bore ofthe bearing and having secured or bonded to its inner surface granular abrading material l6 such as emery or carborundum which bears upon the crankshaftjournal. These abrading liner sections are the same width or length as the bearing and are seated in contacting relation with each other at their end or longitudinal edges. Some suitable means such as is usually provided in connection with the bearing liners, is provided to assure retention of the abrading liner sections in the correct positions with respect to each other and the bearing. In

the construction illustrated by way of example,

this means consists of a lug I! struck outwardly from an end of each abrading liner section and adapted to engage in a recess l8 of the associated bearing member and to abut the adjacent end of the coacting bearing member as shown clearly in Figure 2. In this way the abrading liner sections are also held against turning with the crankshaft the journals of the, crankshaft to the abradingaction of the .abrading liners. As the abrading operation proceeds, the abrading liners may be' adjusted by means of suitable shim plates interposed between the bearing and the abrading liners, or thickerabrading liners may be substituted for those initially placed in the bearings, if found necessary. In the initial steps of the method, comparatively coarse abracling elements orliners are employed, and after the crankshaft rotate the crankshaft for a sufllcient length of time after the abrading liners are placed in the bearings. Upon completing the polishing operation, the abrading liners are removed and the bearings are ready for reception of new bearing liners. All of these operations are performed without removing the crankshaft from the engine and without the necessity of, a separate and distinct lapping and polishing means of expensive, construction. By truing and polishing the crankshaft journals in the engine block and connecting rod bearings, accurate and efficient truing of the bearings is insured in a most expeditious and economical manner. The abrading linersmay be individually manufactured in proper sizes and grades, or'they may be formed at the point of operation by cutting suitable blanks from sheet abrading material especially manufactured for the purpose.

From the foregoing description, it is believed that the nature of the present invention, as well as its advantages, will be readily understood and appreciated by those skilled in the art.

What I claim as new is:

- 1. The method of abrading the main journal of an engine crankshaft without removing the latter from the engine, which consists in substituting in the actual main engine bearing and for the bearing liner sections of said bearing, thin abrading liner sections composed of thin outer shells of stiff strong sheet material having abrading material bonded to their inner surfaces and correspending in formand size to said bearing liner sections, securing said abrading liner sections in the hearing by the means which secures the bearing sections together so that the abrading material thereof contacts the surface of the crankshaft journal, and rotating the crankshaft while in the engine so as to subject its journal to the action of said abrading liner sections. I

2. The method of abrading the journal of an engine crankshaft, which consists in substituting in the actual crank pin bearing of the actual engin'e connecting rods-and for the bearing liner sections of said bearing without removing said connecting rod or its piston from the engine, thin abrading liner sections composed of thin outer shells of stiff strong sheet material having abrading material bonded to their inner surfaces and corresponding in form and size to said hearing liner sections, securing said abrading liner sections in the hearing by the meanswhich secures the bearing sections together so that their abrading material contacts the surface of the crankshaft journal, and rotating the crankshaft so as to subject its journal to the action of said abrading liner sections.

FRANK POSTMA.