US1343142A - Internal-combustion engine - Google Patents

Description

E. T. KERSHAW. INTERNAL COMBUSTION ENGINE. APPLICATION FILED MAR 1 ,4'919.

Patented June 8, 1920.-

2 SHEETS-SHEET l.

Edwin E's haw 3 11mm! E. T. KERSHAW. FNTERNAL COMBUSTION ENGINE. APPLICATION FILED MAR. 11, 1919.

Patented June '8, 1920.

2 SHEETS-SHEET 2- earliest FHCE,

EDWIN T. KERSHAW, OF DENVER, COLORADO, .ASSIGNOR TO THE HUNTER GAS ENGINE AND DEVELOPMENT COMPANY, A CORPORATION OF COLORADO.

INTERNAL-(IQMBUfiTION ENGINE.

To cllwhom it may concern: v

Be it known that I, EDWIN T. Knnsi-mw, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in InternaLCombustion Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to internal combustion engines, and more particularly to that type of engines of the two-cycle or double stroke type.

It is one of the objects of the present invention especially to improve the construction of engines of that type in which there is mounted within the piston, but independently thereof, a compression or abutment member and between which and the tubular piston there is formed a compression space in which a charge of combustible fuel is compressed when the piston is in its lowermost position. Particularly it is an object of the present invention to improve the means for admitting the combustible charge into the compression space between the tubular piston and the abutment head and to facilitate the discharge of the compressed combustible fuel into the combustion chamber to increase the efliciency of the engine by improving the scavenging action as the gases or fuel are in troduced. A further object of the invention is to provide, in combination with a moving member or piston, a head structure on which is mounted an inlet valve designed to be posi tively actuated when the piston is in its lowermost position so as to release a compressed charge of fuel into the combustion chamber, and, further. to so design the parts that the burnt fuel and residue gases are discharged rapidly from the combustion ch amber and yet with a minimum loss of the newly introduced combustible .or fresh charge.

With the above and other objects in view as will be readily manifest to those versed in the art, the invention consists in the combination, the construction, and in details and arrangements of the parts as are more particularly hereinafter described relative to Specification of Letters Patent.

Patented June 8, 1920.

Application filed March 11, 1919. Serial No. 282,030.

to the embodiment of the invention illustrated in the accompanying drawings, in which Figure 1 is a central longitudinal section through the upper portion of a single cylinder motor,

Fig. 2 is a central view with the piston in its lowermost or charge-compressing position,

Fig. 3 is a detail sectional view of the upper portion of the improved piston; and

Fig. 4 is a planview of the elements in Fig. 3.

The invention asshown is embodied in a type comprising a suitable exterior casing or cylinder 2, shown as mounted upon a portion of the crank casing 3, the cylinder having a removable head a (omitted from Fig. 2); Fixedly mounted on the casing is a transverse bar or other suitable support 5, extending. diametrically across the casing 2 and passing through diametrically opposite slots 6 (indicated in dotted lines) in a piston 7 which reciprocates in the casing 2 and is ,slidably fitted upon a cup or compression element 8, the base of which is secured by suitable means to the transverse bar or support 5 thereof. The upper end of the piston 7 is provided with a removable head 9 appropriately held in position on the piston,

and one side of which is provided with an upwardly proyectm'g and arcuate deflector 10,

designed to divert an incoming fresh charge of gas and to direct outwardly through an exhaust port 11 the burnt gases in the com bustion chamber above the head 9 of the piston.

One of the important features of the present invention resides in the provision of means for releasing a compressed charge of .fuel which is admltted through the casing 2 and the piston 7 and into the cup-shaped compression member 8, by coordinating ports 12, 12 in these members, when the same are in the position clearly illustrated in Fig. 1.

In the present case the means for controlling the admission of the compressed fuel into the combustion chamber is shown as comprising a valve 13, having a stem 14 ex tending downwardly through the head 9 and into the piston-7, the valve adapted to seat when closed, upon a bushing 14; (Fig. 3), and is normally maintained in its closed position by an extension spring 15, resting against one end of the bushing 14:, and a spring seat or collar 16 fastened upon the stem 14'.

In operation of the parts, when the piston 7 is moved upwardly to the position shown in Fig. 1, a quantity of fresh combustible mixture is taken through the inlet ports 12,

12, when these are registered, and on the downward stroke of the piston 7 to the position shown in Fig. 2, the charge is compressed in the compression space between the head 9 of the piston 7 and the cup-shaped compression element 8, and when the piston reaches its lowermost position, the end of the stem 14 engages an adjacent portion (as at 5, Fig. 2) of the transverse wall of the member 8, and this causes the valve to be lifted from the seat 14 and the compressed fuel charge admitted into the combustion chamber. Preferably the inlet valve 13 is arranged adjacent to the upper surface of the head 9 and within the arc of the curve or arcuato face of the deflectorl 0, so that an incoming vapor charge is directed vertically upward into the combustionchamber to assist in scavenging the burnt gases as the piston opens the exhaust port 11.

Fromthe above it will be seen that the usual lateral by-pass or outlet ports from the compression chamber and through the casing to the combustion chamber have been eliminated, and a simple and practicable form of automatically controlled and quickly acting valve has been utilized.

It will be understood that the particular method or means of supporting the compression head or member within the piston is no part of the present invention, and that so far as the present'invention is concerned the said compression head or member may be mounted or supported within the piston in any manner that may be found suitable and practicable.

What I claim is: 7

I 1. In an internal combustion motor having separate compression and combustion chambers, the combination of a sleeve valve inlet into said compression chamber, a puppet valve between said chambers, and a member surrounding the compression cham ber performing the dual function of opening both said valves.

2. In an internal combustion motor having separate compression and combustion chambers with a 'piston wall carrying a puppet valve between said chambers, a sleeve valve inlet to said compression chamber, the said sleeve valve comprising an extension of' said piston wall together with an extension of the means for opening said puppet valve. i

3, In an internal combustion motor having separate compression and combustion chambers separated by a piston wall and a sleeve valve inlet into said compression chamber, a cup-shaped piston head telescoping an opposed cup-shaped sleeve valve member, the two cups apertured to produce the said sleeve valve, and the piston head cup apertured for a puppet valve.

4. In an internal combustion motor having combustion and compression chambers separated by a piston wall carrying a puppet valve between said chambers and extended to'form apart of a sleeve valve into the compression chamber, a telescoping member of said sleeve valve operative of said puppet valve.

5. In an internal combustion motor having compression and combustion chambers separated by a piston wall carrying a puppet valve, the said piston wall extended into said combustion chamber as a baffle and also extended into said compression chamberas a member of a slide valve inlet into saidcompression chamber, said wall recessed in said compression chamber in contour conforming to said bafiie.

6. In an internal combustion motor having compression and combustion chambers separated by a piston wall carryinga puppet valve in its combustion chamber, the said wall extended cup-shaped to telescope with an interior fixed cup, the two said cups operative to perform the triple function of forming the compression chamber forming a sleeve valve and opening the puppetvalve.

.7. In an internal combustion engine having separate compression and combustion chambers, a piston performing the five functions of separating said chambers, of carrying a valve governing the fuel supply between said chambers, of a baflle in the combustion chamber, of forming a side wall to said compression chamber, and of forming a member of a sleeve valve inlet into said compression chamber. p

8. In an internal combustion engine having separate combustion and compression chambers, a piston wall separating said chambers and extended to form the .side walls of the compression chambers'and also extended to form a bafl'le into the combustion chamber and telescoping with an opposed cup-shaped member to form a complete compression chamber. 7

9. In an internalcombustion engine, the combination of triple telescoped cups, the outer of said cups forming the head and walls of an explosion chamber, the inmost of said cups forming walls and the head of a compression chamber and theintermediate cup perforated for a valve and forming complementary walls of the said compression chamber and action also as a-piston.

10. In an internalcombustion motor hav ing a piston between its compression and combustion chambers, a triple Wall sleeve valve inlet to the compression chamber, a cup forming one of said Walls of said valve forming also a piston head.

11. In an internal combustion engine having a separate compression chamber, composed of opposed telescoping cups; a puppet valve outlet to said compression chamber, said puppet valve operable by the closing of 10 said cups.

In testimony whereof I aflix my signature.

EDWIN T. KERSHAW.

Images