Corrugated Cylinders for Internal Combustion Engines.
Year: 1893

page_text: Date of Application, 14th Mar., 1893
Complete Specification Left, 6th Oct., 1893-Accepted, 18th Nov., 1893
PROVISIONAL SPECIFICATION.
Corrugated Cylinders for Internal Combustion Engines.
JOHN TREWHELLA, Marine Engineer, Wargrave, Berkshire, do hereby declare
the nature of this invention to be as follows:-
This invention relates to corrugated cylinders for heat engines of various kinds,
to decrease the cooling of the charge while expanding.
According to this invention the cylinder face is cast with, or has bored out a
number of corrugations, the prominent parts of which are bored to fit the piston,
and the recesses which may be of any shape, are filled with refractory material.
The action of this arrangement during the working stroke is as follows, the
prominent parts are kept at a working temperature by a water jacket or some other
means, then during the working stroke, part of the effective heat (which would
have been lost through the cylinder walls in ordinary cylinders) will be refracted
by the nonconducting material to give out work on the piston.
Dated this Fourth day of March 1893.
JOHN TREWHELLA.
COMPLETE SPECIFICATION.
Corrugated Cylinders for Internal Combustion Engines.
JOHN TREWHELLA of Wargrave in the County of Berkshire, Marine Engineer,
do hereby declare the nature of this invention and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement :-
This invention relates to corrugated cylinders for heat engines of various kinds.
The said invention consists of making the motor cylinder with corrugated walls
internally, and fitting refractory nonconducting material between each corrugation
to diminish the cooling of the charge while giving out useful work on the piston,
and vice versa for the cylinder to give less heat to the incoming charge, during the
charging stroke.
DESCRIPTION OF THE DRAWINGS.
The drawing is a side elevation in section, of the motor cylinder A, A, and
piston P, with the corrugations and refractory coil S, in position, T, represent a
covering of asbestos tape. In this drawing which illustrates my invention
A, A, represents the motor cylinder with a water jacket as usual, the piston P, and
the cylinder A, A, are turned and bored to a working fit to each other. The
cylinder has a coarse pitch thread cut through it which forms the corrugations.
The non-conducting spiral coil S, may be made of metal or other material, with
pitch and shape corresponding to the cylinder. When made of metal it is lapped
with asbestos tape T, and sprung into its place in the cylinder, as shown in the
drawing. The coil will stay itself when once in position, and by this arrangement
the coil can be easily withdrawn and renewed when required. The packing rings
of the piston are sufficiently wide to bear on two or more corrugations at any part
of the stroke, to keep them from catching and breaking. Another form is to bore
a series of circular recesses and fitting a separate refractory ring to each. The
action of these arrangements are as follows. When the charge is burning in the
cylinder, and the piston moving by its influence, the parts of the cylinder exposed
to the charge are absorbing heat, commonly known as waste heat to cylinder walls.
Price 8d.1

page_text: The refractory coil or rings refracts this heat to give out useful work on the
piston.
Having thus fully described my invention and the manner of performing the
same, I wish it understood that I claim―
Cylinders with internal corrugated walls, containing between each corrugation
nonconducting refractory material, for the purpose set forth, and as shown in the
accompanying drawing.
Dated this 29th day of September 1893.
JOHN TREWHELLA.