US2065688A

US2065688A - Port valve and pump construction for internal combustion engines

Info

Publication number: US2065688A
Application number: US705317A
Authority: US
Inventors: Hewitt A Gehres
Original assignee: Cooper Bessemer Corp
Current assignee: Cooper Bessemer Corp
Priority date: 1934-01-05
Filing date: 1934-01-05
Publication date: 1936-12-29
Anticipated expiration: 1953-12-29

Description

Dec. 2 9, 1936. H. A. GEHRES PORT VALVE AND PUMP CONSTRUCTION FOR INTERNAL COMBUSTION ENGINES 2 Sheets-Sheet 1 Filed Jan. 5, 1934 INVENTOR BY Hewitt A. Gehres Ufa/u W1 71m )Akv ATTORNEYS H. A. GEHRES 2,065,688

PORT VALVE AND PUMP CONSTRUCTION FOR INTERNAL COMBUSTION ENGINES Filed Jan. 5, 1934 .2 Sheets-Sheet 2 INVENTOR Hewitt A. Gelu'es H ATTORNEY$ Patented Dec. 29, 1936 2,065,688

' UNITED STATESPATENT- oFFlcE PORT VALVE AND PUMP CONSTRUCTION FOR INTERNAL COMBUSTION ENGINES Hewitt A. Gehres, Mount Vernon, Ohio, assignor to Cooper-Bessemer Corporation, Mount Vernon, Ohio, a corporation of Ohio Application January 5, 1934, Serial No. 705,317

4 Claims. (Cl. 123-59) The invention relates to internal combustion partly open to admit air under pressure into the engines of the two cycle type, wherein an inlet cylinder;

port is employed in connection with the usual Fig. 8 shows my invention applied to a double exhaust port, for scavenging and/or supercharg acting engine, with the single piston employed on ing p rposes. I the lower end of its stroke and full scavenging of The present invention provides an inlet port of the upper end of the cylinder taking place; and

the above character which is valve controlled, and Fig. 9 shows the same arrangement as shown with the valve is coordinated a pump member or in Fig. 8 with the piston at the upper end of itsv vane which supplies air under pressure for the stroke and the full scavenging of the lower end port and which may be connected to move with of the cylinder taking place. 10 the valve, resulting in a simple, economical and The drawings disclose a preferred type of valve compact construction wherein air under pressure and pump construction, as applied to two-cycle may be supplied for scavenging or supercharging Si e acting a double a g tWO cylinder purposes, and wherein the valve and pump may. gines 0f the Diesel typ be easily and conjointly driven and timed, th In Figs. 1 to 7 I have illustrated my invention as 15 avoiding the complication and large expense appli to a w y le ine with two cylin erswhich has been involved in prior constructions Fi s- 1 a d 2 show t usual crank a crank for similar purposes. As another possible feature Shaft i i, Piston rod i2 and piston Operating in of the invention I disclose a construction of the Cy 0f the P Of Cylinders and above character wherein one pump is enabled to The intake peril of h Cylinder I4 is Shown 20 supply two cylinders. at I6, Fig. l, and the exhaust port at H. It

Other objects and advantages of the invention Should be understood that the above mentioned will'be apparent from th following description port and valve construction with its associated taken in connection with the drawings, in which P y b used for scavenging p I have shown a. preferred form of valve and pump Charging purposes in j t on Wit othe 25 in connection with single acting and double actmeans for supplying fuel and air, or may act as ing engines for the purpose of illustrating the the Primary Supply of Combustion p prlnciples of my invention, and in which poses, and that fuel may be supplied in whole or Fig. 1 shows a vertical section through a two in part y th pu p and t d into the yl cylinder two-cycle engine with th inv t apder through the port if desired. References here- 30 plied thereto, and showing th position of t inafter to the above port as an air inlet port are parts when one piston is at thenottom limit of to be understood a comprehending t e above posits stroke; sibilities of the invention in its broader aspects.

Fig. 2 shows a horizontal cross section through A Valve Seat Communicating With t O er the two cylinders taken approximately on the ends of the ports 0f the Cylinders i4 and I5 s 35 line 2-2 of Fig. 1. preferably formed in the cylinder casting, and in Fig. 3 shows the relative positions of the parts this is mounted a Valve member to which is when the piston is on upper dead e t connected a pump blade 20 which operates in a Fig. 4 shows the relative positions of parts housing D p Chamber also preferably in- 40 when the same piston is on its down-stroke and teglel With e Cylinder eeSting- The Valve 9 is 40 just about to uncover the intake port; preferably cylindrical at points adjacent to the Fig. 5 shows the same piston still farther down ports 16 a s d at i ts opp ite said on its down-stroke, in a position where it has unports, as indicated clearly in Figs- 1 and The 2 covered a part of the exhaust port and more than housing or pump chamber 2| is. provided with half opened the intake port, the valve or hub of L Suitable forms of Suction intake Valves 22 45 the oscillating blade pump starting to u v and 23.

the lower edge of the intake port; The housing 2| may be provided with a remov- Flg. 6 shows the same piston at the end of it able endsection 24, as indicated in Fig. 2, to facildown-stroke with both the i tak a exhaust itate mounting and dismounting of the valve and ports fully uncovered and with the pump blade pump. The v v 9 s preferably pr vided with so still traveling to'compress air in the lower part of reduced P r bearing in the movable end the pump chamber; 24 and in the fixed end of the pump chamber 2|,

Fig. '7 shows the same piston on theupstroke in the reduced p n projecting th ough said lata position where it has just covered the exhaust r end being provided with suitable driving means port and in which the scavenging port is still such as a crank arm 25 which may be operated byalinklt connectedtoaerankarmi'lmounted on the crank shaft II, as indicated in Figs. 1 and 2.

In Fig. 3 I have-shown the piston II of one of the cylinders, such as the cylinder I, at the upper end of its stroke and the intake port closed on by the valve ll. As the piston moves down,

the pump blade It continues its counterclockwise movement and draws air into the lower end of the pump chamber below the blade and then moves clockwise, compressing the air in the lower end of the pump chamber. When the piston in its downward. stroke reaches the position shown in Fig. 4 the blade has compressed the air in the lower end of the pump chamber preparatory to scavenging the cylinder, and the valve is still closing the intake port so that no transfer of air tained if desired.

shown in Fig. 6 causes both the intake and exhaust ports to open, and as the valve is uncovers the intake port the scavenging action proceeds. Fig. 6 shows the piston at'the end of its down-stroke with the intake and. exhaust ports wide open andvalve I! open, full scavenging taking effect and continuing until the parts assume the position shown in Fig. 7.

Fig. 7 shows the piston on the up-stroke at a point where it has just covered the exhaust port. The intake port may be still open and the scavenging blade, which has moved from the position shown in Fig. 6 to the position shown in Fig. 7, is Just completing its full travel and is charging the last remaining part of the air into the cylinder of the engine in the form of a super-charge.- The use of valve I! for controlling port It instead of relying on piston llfor this purpose. may keep'the auxiliary port It openafter the exhaust port II has closed (as indicated in Fig.

'1) whereby a supercharging effect may be ob- The same cycle of events takes place in the adjacent cylinder Ii, except that it is scavenged and supercharged by air compressed in the upper end of the pump housing by the upper side of the blade, the upper side of the valve i9 being cut away, as shown in Fig. 2, to control the intake port of this cylinder. With this arrangement for single acting engines, one of these double acting scavenging pumps will furnish the supply of air -'for two adjacent cylinders for scavenging and supercharging purposes. In a multiple cylinder engine, each pair of cylinders would preferably have one double acting pump, each side of which scavenges and supercharges the adjacent cylinder.

The illustrative embodiment of my invention that I have described in connection with the single acting engine can be applied with slight variation to a double acting engine, in which case there is one pump for each double acting cylinder. I have shown such a construction in Figs.

8 and 9. r

Fig. a shows the piston at the lower end of its stroke in the double-ended cylinder 3|, full scavenging of the upper end 32 of the cylinder .port 35 and a single intake port 36 which communicates with a cylindrical opening receiving the valve 31 which carries the pump blade 33.

The valve'iscut away on both sides of the blade in alignment with the port 36, as indicated clearly. on Figs. 8 and 9. The pump casing II and the suction valves 38 and ill may be of any suit able construction, as indicated diagrammatically.

It will be noted from Figs. 8 and 9 that the upper and lower ends of the intake port 36 are so arranged with respect to the upper and lower ends of the exhaust port 35, that scavenging air may be admitted through the intake port before the exhaust port is open and that supercharging air may be admitted through the intake port after the exhaust port has been closed. The solid portion of the valve 31 functions to close communication between the, upper and lower sides of the pump chamber with the port so that air drawn into the lower end, as shown in Fig. 8, will be confined therein and will be later compressed as the blade moves downwardly to compress and force the air into the lower end SI of the cylinder 3|. The pump shown in Figs 8 and 9 operates in all respects the same as the pump shown in Figs. 1. to '7.

' It will now be apparent that I have provided as simple, compact, economical and efliclent device for scavenging and supercharging cylinders of internal combustion engines. It is to be understood, however, that the specific mechanism illustrated and described constitutes but one embodiment of the principles of my invention, and that words of description. imported from the specification into the claims are to be considered as such and not words of limitation, as it is my intention to cover all devices which fall within the principles of myinvention, as defined in the appended claims. a 4

I claim:

1. An internal combustion engine of the two cycle type having cylinders each provided with an exhaust port and an inlet port located near one limit of the piston stroke, a common pump chamber located adjacent said inlet ports, valve valves and pump members in unison, whereby said pump member operates during a given phase of its movement to draw in air for one inlet port into one part of said pump chamber when its valve is, closed and supply air under. pressure from another part of said pump chamber to the other inlet port when its respective valve is open.

2. An internal combustion engine of the two cycle type having alined cylinders and a piston member reciprocating therein, inlet port means for each of said cylinders located intermediate the same, a-common pump chamber located adjacent said inlet port means, a valve member interposed between said pump chamber and inlet port means, adapted selectively to open and close communication between different parts of said (6 pump chamber and portions of the inlet port means leading respectively to said cylinders, a pump member within said chamber dividing said chamber into difierent parts and connected to 'said valve member to move therewith, and common means for driving said pump-member. and valve in unison, whereby said pump and valve members operate during a given phase of movement to draw in air for one cylinder into one of said parts of the pump chamber when the valve member closes communication to the corresponding cylinderand to supply air under pressure for the other cylinder from another part of the pump chamber when said valve member opens. communication between said last mentioned cylinder and part of the pump chamber.

3. An internal combustion engine of the two cycle type, having adjacent cylinders provided .with inlet port means located near one limit of ried by said valve member-and dividing said chamber into two parts, means for admitting air to each of said parts of the pump chamber, and means for moving said valve member angularly through successive phases in which it alternately opens and closes communication between said parts of the pump chamber and the respective cylinders while the pump blade acts alternately to draw air into the respective parts of the pump chamber and supply air under pressure therefrom to the respective cylinders.

4. An internal combustion engine of the two cycle type, having cylinders disposed side by side and inlet ports both located near one limit of the piston stroke, a common angularly movable valve member extending between said inlet ports and controlling communication to both of them, a pump chamber located adjacent said valve member, a pump blade carried by said valve member and dividing said pump chamber into parts respectively serving said cylinders; means for admitting air to each of said parts of the chamber, and means for. moving said valve member angularly through successive phases in which it alternately opens and closes communication betweensaid parts of the pump chamber and the respective cylinders while the pump blade acts alternately to draw air into the respective parts of the pump chamber and supply air under pressure therefrom to the respective cylinders.

HEWI'I'I' A. GEHREB.