US1252319A

US1252319A - Internal-combustion-engine cylinder.

Info

Publication number: US1252319A
Application number: US15438617A
Authority: US
Inventors: Granville E Bradshaw
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-03-12
Filing date: 1917-03-12
Publication date: 1918-01-01
Anticipated expiration: 1935-01-01

Description

Patented Jan 1,1918.

G.- E. BRADSHAW.

INTERNAL CDMBUSHON NGINE CYLINDER APPLICATION FILED MAR. 12. IBM. 1,252,319.

alumna n. tanans'naw, or nnnsn'm, waL'roN-oN-rnms, ENGLAND.

. I m'rnnnAL-coxnosrIon-nuamn cYLmnan.

Specification of Letters Patent.

Patented Jan. 1, 1918.

- Application filed lurch 12, 1917. Serial No. 154,388.

To all whom it may concern: 1

Be it known that I, GRANVILLE Easrwoon BRADSHAW, a subjectof the King of Great Britain and Ireland;j ;of A. B. 0. Motor Works, Hershanl,WaltonJni-Thames, in the county of Surrey, England, have invented new and useful Improvements in Internal- Combu stion-Engine Cylinders, of which the following is a specification.

y invention relates to the design or.

manufacture of internal. combustion engine cylinders for use on petrol, oil, and gas engines, of all types, but partipularly for aeronautical engines, motor car and motor cycle engines, light stationary engines, and the like, where it is desirable to cool the cylinders Without the necessity of using water circulation.

Made according to my present invention, the cylinders are very light, cheap to manu-- facture, and they secure the advantages obtained by" the use of materials of high heat conductivity...

Formerly, cylinders have been made of cast iron, and other materials with fins or gills madeof sheet or cast copper, aluminium, and the like, fitted by suitable means to the outside, but such arrangements have the disadvantage of insufiicient. metallic contact bawe the cylinder walls and the gills,

or-the necessity of brazing or otherwise attaching these satisfactorily.

The best known form of air cooled cylinder is that in which the cylinder is made of cast iron, with the cooling fins or gills cast around the outside, but thishas the disad vantage that cast iron is a very poor-conductor of heat, and a sufficient number of fins or lgllls to give the maximum amount of coo 1 ng cannot be cast on the cylinder on account of the difiiculties encountered in the manufacture of the casting and the necessity for comparatively thick fins or ,gills, in order to render casting easy.

.In the drawing, I

igure 1 is a central vertical section through an engine cylinder having my inag. 21s a sectional view taken at 'zright angles to Fig. 1 taken between two adjacent ribs or'fins.

.In my invention I employ a cylinder A machinedfrom a steel bar or tube, or other material of high heat conductivity, on the outside of which are machined fins or gills v deposited, and a C of the correct size, shape and s 0 acing to give the most ,efiectlve cooling.

op eris then electrically deposited on the outslde of the cylinder to form a layer B over both the cylinder and fins sides of the fins.

materials for conducting heat, but any other metal that is a satisfactory heat conductor may be used where it is possible to deposit same. Any such deposit may be applied either to individual cylinders or to cylinders assembled in a group.

- The advantages obtained by my invention are that the cylinders are 0 cap to manufacture, most scientifically correct spacing and shape of fins, etc, can be obtained, there is an excellent support for the copper when maximum amount .of heat can be dissipated by the fins owin to the conduction of heat by the layer B f cylinder body to the tips of the fins.

I claim:

1. As an'article of manufacture an engine cylinder having radiating fins integral therewith, said cylinder and fins having a strength, rigidity, and heat conductivity of the order of steel, and a continuous exposed layer of copper of substantially unlform thickness adhering to the sides of said -fins and the outer surface of said cylinder.

2. An engine cylinder provided with in tegral radiating fins. and an adherent coat ing of metal of high heat conductivity of substantially uniform thickness on the cylinder and fins whereby heat from the cylinder barrel is conducted toward the tips of the fins bysaid metal of high thereby providing a cylinder of greater radiation capacity than that obtained by one having fins made of the same material as the cylinder. and of greater strength than one having fins of high heat conducting metal only.

3. An engine cylinder having integral fins tially uniform thickness of metalof high heat conductivity as compared with the heat conductivity oftlie body of the cyl nder 1n adhesive contact in said cylinder and fins over substantially the entire surface them.

in order to assist in con-' ducting the heat from the cylinder along the rom the I heat conductivity,

lot

of whereby greater radiation capacity of he cylinder is obtained and also strength of the cylinder as compared with cylinders havin separately attached fins.

4. 11 engine cylinder with integral fins, said cylinder and fins being of homogeneous steel to provide high strength and heat conductivity, and a la er of copper of substantially uniform thic ness in adhesive contact with said cylinder and fins over substantiall the entire surface thereof, whereby hig heat conductivity of the fins is obtained and also whereby greater strength for the bined cylinder and fins is obtained than would be obtained with separate fins.

5. An engme cylinder having'integral fins homogeneous therewith, said cylin er and fins being of a material of high strength and heat oonductivitfv asoompared with cast iron, and a layer 0 metal of substantially uniform thickness and of hi%)h heat conductivity as'compa-red with the ody of the cylinder in adhesive contact with said cylinder and fins over substantially the entire surface thereof.

GRANVILLE E. BRADSHAW.