US1282831A

US1282831A - Motor.

Info

Publication number: US1282831A
Application number: US22080718A
Authority: US
Inventors: Edward R Hewitt; August H Leipert
Original assignee: International Motor Co
Current assignee: International Motor Co
Priority date: 1918-03-06
Filing date: 1918-03-06
Publication date: 1918-10-29
Anticipated expiration: 1935-10-29

Description

Patented Oat. 29, i918.

W/TNESS:

EDWARD R. HEWTTT, OF MIDVALE NEW JERSEY, ANI) AUGUST H. LEIPERT, OF BROOKLYN, NEW YORK, ASSIGNORS ITO INTERNATIONAL MOTOR COMPANY, 0F NEW YORK, N. Y., A CORPORATION DELAWARE'.

i Moron.

Maasai.,

Specication of Letters Patent.

Patented Oct., 29, ilm,

Applicationlled March l6, 1918. Serial No. 220,807 i and AUGUST H. Lnirnn'r, citizens Vof the' United States, residing, respectively, at Midvale, in theState of New Jersey, and in the borough of Brooklyn of the city of New York, in theState of New York, have invented certain new and useful Improvements in Motors, of which the following is a specification, reference being had to the accompanying drawings, forming apart hereof.

The use of forged steel, sheet steel or pressed steel inthe construction of internal combustion engines has long received attention, but as yet motors constructed of such material have not found their way on the market in large numbers and have not proved satisfactory underV conditions of actual operation, Cylinder heads, which carr inlet and exhaust valves and their seats, a though very desirable have not been satisfactory in use, when constructed of such ma` terial, because such material, when of the proper grade of steel for its purpose, does not maker-.a satisfactory, durable valve-seat. ln fact, there is no steel, workable at a reasonable expense for such purpose which will make a good valve-seat and cylinder heads made of such material quickl become useless because of trouble with t e valve-seats. It is known, however, that cast iron makes a good valve-seat and that the higher the proportion of combined carbon in the cast iron the harder and the more durable the seat becomes. It is further known that the amount of combined carbon which remains in cast iron, in the cold state, is dependent largely upon the rate of cooling, as well as upon chemical characteristics ofthe iron. The object of this invention is to make it possible to use forged steel, sheet steel or pressed steel in the construction of cylinder heads by combining therewith cast iron valve-seats in such manner that the content of combined carbon in the cast iron valveseat is very high. ln accordance with the invention rings of cast iron are welded upon the steel head and are thereafter machined to form the .valve-seats. The seats thus formed have perfect conductivity andV a high content of combined carbon, withY consequent great durability, since Vthe welding of the cast iron ring takes place directly on a sheet of steel which readily conducts the heat away as soon as the welding arc or flame is removed, so that the chilling of the cast ironie very rapid and, as pointed out above, the content of combined carbon is high. The invention will be more fully described hereinafter with reference tothe accompanying drawing in which it is illustrated and in which,-

Figure lis a view, in transverse section, through a cylinder head of suitable'construction which is provided with cast iron valve-seats.-

1 Fig. 2 is a detail view, in section, through one of the knees with which the valve-seat is combined.

Fig. 3 is a detail view, in section, of another part of the head'with which the valveseats are combined.

Fig. 4 is a detail view, in section, of one of the cast iron valve-seats.

Fig. 5 is an end view of the valve-seat shown in Fig. It.

The cylinder head, to which the invention is applied, is constructed of sheet steel or pressed steel or forged steehmade of any lsuitable configuration. The head indicated in the drawing has a body a which is substantially rectangular in cross-section, with an opening at a to receive a dome b which constitutes the compression chamber or a part of the compression chamberfor the corresponding cylinder, openings at a2 for communication with' the inlet manifold c andthe outlet manifold d respectively and for the knees which carry the valves, and, at

water-circulating pipe. ln each opening c2 is seated and secured, preferably by welding, a knee e which, in the construction shown, supports the valve-stem guide as well as the valve-seat and laces each valveseat in conununication with the corresponding inletfar-fexhaust manifold, as the case may be. "Eia'ch knee c is punched out, as at e', to receivethe corresponding valve-stem guide f, which passes through the to wall of the head and is preferably wel ed in place, 'as indicated at and f2. flach knee, which is made of pressed steel or sheet steel, is formed with a flange e2 which is preferably threaded interiorly, as indicated at cg. Each dome Z), welded in its seat in the bottom wall, cf the head, has formed therein a suitable pointpwith a connection d for the openings for registration with the corresponding knee c or d, as the case may be.

Each valveseat is formed by a ring g of cast iron, which is anged as at g and is preferably threaded exteriorl as indicated at g2.

When the knees e have been introduced through the openings in the sides of the head, the cast iron rings. g are introduced throughthe dome Z1 and are threadedlinto the flanges of the knees e, drawing the flanges snugly against the outer surface of the dome through the coaction of the ianges g With the under side of the dome.

Thereafter, by means of acetylene iame or electric are, the cast iron ring is fused or welded in place, as indicated at g3, and the flange e2 may also be Welded to the dome, as indicated at c".

The cast iron valveseats-are formed approximately to the desired shape before they are insertedfand Welded in place and after being so inserted and Welded they are machined so as to form proper valve-seats for -coaction with the valves indicated at :t by

broken lines.

Leanser By reason of the high conductivity of the steel Walls of the head, including the domes and the knees, the cast iron rings g are cooled ofi' quickly when the flame or arc has been removed and thereby the content of combined carbon is increased and the valveseat made thereby more durable.

It Will be understood that the form, proportion and arrangement of the several parts of the head may be varied to suit the requirements of each case and that the invention, therefore, except as pointed out in the claim, is not limited to the particular construction and narrangggement shown.

We claim as our invention:

The method of making valve-seats in pressed steel cylinder heads which consists in welding a cast iron valve-seat ring in place, permitting thering to cool quickly after Welding in order to increase the content of combined carbon, and thereafter finishing the valve-seat.

This specification signed this 23 'day of Februar 1918.

EDWD R. HET/NTT. AUGUST H. LEPERT.