US1572918A

US1572918A - Internal-combustion engine

Info

Publication number: US1572918A
Application number: US745350A
Authority: US
Inventors: Geddes William Francis
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-10-23
Filing date: 1924-10-23
Publication date: 1926-02-16
Anticipated expiration: 1943-02-16

Description

` Feb. 16, 1926.

w. F. GEDnEs INTERNAL conusnou snows Filed Oct. 23, 1924 Patented Feb. ld, 1926..

UNEE) HQE..

WILLIAM FRANCS GEDBES, 0F SUBEAC, VJESTERN ATRALA, AUSTRALA, AS-

SIGNOR 0F THEEEEIGHTHS TO WALTER SGHGFELID, @E BASSENDEAN, YVESTERN AUSTRALIA.

NTERNALCGMBUSTEEI ENGNE.

Application :filed October 23, i924. Serial No. 745,350.

To all whom it may concern.'

Be it known that l, lViLLri-irr lFnANois Gnomes, a subject oil the King` ot Great Britain and ireland, and resident ot Subiaco, in the State of Western Australia, Commonwealth of Australia, have invented an lnr provenient in lnternal-Combustion Engines, of which the following description, in connection with the accompanying drawing, is a specilication, like characters on the drawing representing like parts.

rilhis invention relates to improvements concerning internal combustion engines.

ln internal combustion engines, hitherto constructed, connecting rods have been connected to cranks operating a crank shaft. rlhereiore, with a uniform speed of crank shaft, each stroke of the piston has had the same velocity. it is considered that the comparatively low eliiciency ot the internal combustion engine is largely due to too rapid piston velocity during the power stroke, which precludes adequate absorption of the explosive effort.

The varying torque due to the changing positions oi' the connecting rods and cranks also reduces the eiliciency.

The present invention discloses means whereby the explosion and intake piston strokes can be ot comparatively slow speed, whilst the scavenging and compression strokes will be ot higher speed.

To enable the invention to be more readily understood reiierence will now be made to the accompanying drawings, in which Fig. 1 is a side elevation partly sectional ot a unit constructed according to the invention.

Fig. 2 is a diagrammatic representation to indicate positions of the crank and connecting rod at various parts of the up and down strokes.

Referring more specifically to Fig. 1, the piston 10 can have a gudgeon pin 11 ot' the conventional form. A. connecting rod 12 at the big end is pivoted and ulcrumed to a lug 18 of a rocking and slotted inclined bent lever 14. This lever is inclined upwardly so as to be at an angle of 150 when the piston is at the top of the stroke and to be approximately horizontal when the piston is at the bottom of the stroke. Such lever extends laterally and is ulcrumed at 15. rl`he crank shaft 16 is approximately in horizontal alignment with the ulcrum 15 when the invention is applied to a. vertical engine.V Said crank shaft has a crank 17 supporting a crank pin 18, that is embraced by a shrouded roller 19 running in the slot ot the lever 14.-. itlternfu'ivcly, a sliding block could be used.

lleciprocation ot the connecting rod 12 results in the slotted lever 14e being rocked and in the roller 19 being rolled backwards and forwards in the slot thereof. lllieanwhile the crank pin 18 is being rotated in the path ci the dotted line shown in 1, whereby the crank shaft 16 carrying the ily wheel is also rotated. Relative movement between the piston and the crank shalt does not have the simple relationship that it does in the conventional mechanism. This statement will be explained by reference to the diagrammatic representation shown in Fig. 2. in this a, o represent respectively the centres of the gudgeon pin and the crank pin when the piston is at the starting point ior the downward stroke; b, b represent the aforesaid centres when the piston has travelled halt' ot its downward stroke; o, o represent the aforesaid centres when the piston is at the end of the downward stroke; al', CZ represent the aforesaid centres when the piston has travelled halt of the return stroke. This means that whilst the gudgeon pin and attached piston have travelled from o to o, the crank pin has travelled from a to o', or about 5/8 of a revolution. `Whilst the gudgeon pin and piston are travelling the return stroke from o to o, the crank pin will travel from c to o, or about '0X3 of a revolution.

rlranslated into terms of practice where there is a comparatively constant speed at the crank shaft the foregoing means that each piston stroke is relatively ot slow speed, whilst the return stroke is correspondingly faster.

The invention as applied to a four cycle engine results in the explosion and intake strokes, being comparatively slow, whilst the scavenging and compression strokes are correspondingly faster. lt should be noted that the lever 14 is ulcrumed laterally to the lett side ot the cylinder to obtain the e'ect peculiar to my invention when the crank rotates in a clockwise direction. Should it be necessary to apply my invention to an engine in which the crank normally rotates in an anti-clockwise direction, then the lever le will be ulcrumed laterally to the right of the cylinder.

lt should further be noted that should the engine be inverted as compared to the position which is conventional, the following relative positions will be necessary. The power stroke will move upwardly, Whilst the bent lever la will be inclined downwardly and will be ulcrumed to the right of the cylinder to 'obtain the results accruing from this invention when the crankis rotating in a clockwise direction. Usually it will be preferable to have a plurality o1 units operating the same crank shaft. The units will be positioned in such relative stroke positions as are adapted to give a well balanced power plant.

I claim 1. In an internal combustion engine, the combination of a cylinder, a piston working therein, a connecting rod, a slotted rocking lever itulcrumed laterally lett of the cylinder and pivoted-to the connecting rod, and a crank slidingly-connected to the slotted lever and rotated in a clockwise direction thereby.

2. In an internal combustion engine, the combination ot a cylinder, a piston Working therein, a connecting rod, a slotted upwardly inclined and bent rocking lever ulcrumed laterally lett of the cylinder and pivoted to the connecting rod, and a crank slldingly connected to the slotted lever and rotated in a clockwise direction thereby.

3. In an internal combustion engine, the combination of a slotted upwardly inclined and bent lever 'ulcrumed on the lett side, a crank slidingly connected to the slotted lever and rotated ina clockwise direction thereby, and a crank shaft approximately in horizontal alignment with the itulcrum of the inclined lever.

l. In an internal combustion engine, the combination with a cylinder, ot a piston working therein, a connecting rod, a crank shait having a crank and a slotted rocking lever fulcruined laterally of the cylinder at such a point that a line drawn through the tulcrum and the crank shaft is approximately perpendicular to the cylinder axis, the slotted portion of said lever receiving the crank and being inclined relative to the cylinder axis, the ulcrum point and inclination oi' the lever being such that duringl the power stroke and suction stroke the c 'ank' will be turned through a greater arc than during the compression stroke and scavenging stroke.

Dated this 18th day of September, 1924.

l/VILLIAM FRANCIS GEDDES.