US1207429A

US1207429A - Means for equalizing piston displacement.

Info

Publication number: US1207429A
Application number: US7022316A
Authority: US
Inventors: James Currie Morison
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-01-04
Filing date: 1916-01-04
Publication date: 1916-12-05
Anticipated expiration: 1933-12-05

Description

J; C. MORISON.

MEANS FOR EQUALIZING PlSTON DISPLACEMENT.

APPLICATION FILED 1AN.4, l9l5. Q

' Patented Dec. 5,1916.

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MEANS FOR EQUALIZING PISTON DISPLACEMENT.

APPLICATION FILED 1AN.4.1916.

LQUTYAQWU Patented Dec. 5,1916.

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MEANS FOR EQUALIZING PISTON DISPLACEMENT.

APPLICATION FILED 1AN.'4, l9l6.

1 .QWYAWW Patented Dec. 5, 1916.

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MEANS FUlEt JEQUALIEING- PISTON DISPLACEMENT.

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Application filed January 4-, 1916.

Z'oall whom it may concern: r Be it known that l, JAMES C. Monrson, a citizen of the United States, and a resident of Memphis, in the county of Shelby and State of Tennessee, have invented a new and llmproved Means for Equalizing Piston Diswhich the following is a full, clear, and exact description.

My invention relates to means for equalizing the piston displacement during each half engine stroke, and the object thereof is to eliminate vibration in reciprocating engines, particularly those of high speed.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists of the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of theiapplication, similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a longitudinal vertical section through an engine provided with an embodiment of my invention; Fig. 2 is a transverse vertical section of the engine; Fig. 3 is a diagrammatic view of the piston displacement and the eccentric whereby the displace ment is rendered uniform; Fig. 4 is a diagram illustrating the relative position of' two adjacent cranks and eccentrics carried thereby; Fig. 5 is a modified structure of the means for equalizing the piston displacement;'Fig. 6 is a section on the line 66 of Fig. 5; and Fig. 7 is a diagram showing the relative position of two adjacent cranks and the eccentrics provided thereupon.

It is a well-known fact that piston displacment is not uniform through the'stroke thereof and it is dependent upon the length of the stroke and the length of the connecting rod. To obviate the difierence in the displacement of stroke it is necessary to unduly increase the length of the connecting rod, which is not desirable in engines of the type used in automobiles, flying machines and motor boats, or it is impracticable, due to the desire for economy of space. the piston displacement, vibration sets up in. the engine, and the object of this invention is to overcome such vibration.

Referring to the drawings, 8 is a balanced tpecification of Letters Patent.

' with a pinion 12 that the eccentric 8 is of the piston for each twenty degrees displacement of crank in the same different position of the .quently, the speeds of two adjacent Due to the variation in- .lPate-nted Dec. 5, ltitti. Serial No. 70,223.

eccentric interposed between the connecting rod 9 and the corresponding crank 10 of the crank shaft 11. The eccentric is provided meshing in an interior gear 13 mounted within and secured to the crank casing 14. The ratio between the

gears

12 and 13 is such that the eccentric will revolve twice during a single revolution of the crank, as shown in Fig.

It will be noted from Fig. 3 that, as the crank 10' moves degrees from A to B, the eccentric 8 will move through an angle of one hundred and eighty degrees, thus increasing the distance between the crank and piston to compensate for the displacement of the connecting rod from the axis of the. cylinder due to the displacement of the crank 10. is displaced from B to 0 through an additional angle of ninety degrees, the eccentric 8 is revolved through an angle of one hundred and eighty degrees, thus shortening the distance between the crank and piston as the connecting rod moves toward the axis of the cylinder. The movement of the connecting rod from C to A is-similar to what has been stated from A to C. It is self-evident a proper size to obtain the desired compensation to eliminate the inequality of displacement of a piston 15 during each half of its stroke:

In Diagram 4, D is the position of the eccentric of one of the engine cylinders, and E is the position of the eccentric of an ad jacent cylinder of the engine. The angle formed by the connecting rod with the corresponding axis of its cylinder will be d and e. l) and F/ illustrate the relative position of the eccentrics after the crank shaft has revolved through ninety degrees, the change in angles being represented by d and c. From this diagram it will be seen that the angle (Z is larger than the angle 6 at a certain position of the crank shaft, and at a gle d is less than the angle e; Consepistons are not equal through the strokes'thereof. However, the difference in the rate of speeds of the two adjacentpistons is so slight that the vibration which may result will be practically m'l.

In cases where it is perfect equality cent pistons, the

desired to obtain a of speed between two adjaadjacent eccentrics of the through an angle of ninety As the crank crank shaft the anrangement. F indicates the position of an eccentric ofone cylinder, whileGr indicates the position of the eccentric of the adjacent cylinder of the engine. It will be noted that the two eccentrics revolve in opposite directions, F and G indicating the position of the said eccentrics after the crank shaft has revolved through an angle of ninety degrees. The angle f formed by the cylinder axis with the connecting rod cooperating with the eccentric F is equal to the angle 9, and the angle f also equals the angle 9 at a different position of theeccentries. Therefore, with suchnn arrangement the speeds of the two adjacent pistons at any point are equal, and thus a perfect balance betweenany'two adjacent pistons is obtained. To reversethe direction of an eccentric S the pinion 12 associated therewith is not meshed to the stationary interior gear 13, but an idler 16 is interposed between the pinion and the stationary gear, which idler is carried by the crank shaft 11.

From the foregoing description taken in connection with the accompanying drawings, the advantages of the construction and method of operation will be readily understood by those skilled in the art to whichthe invention appertains, and while I have described the principle of operation, together with the apparatus which I now consider to be the best embodiment thereof, I desire to have it understood that-the apparatus shown is merely illustrative and that such changes may be made when desired as fall within the scope of the appended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. Means for equalizing piston displacement in. engines, comprising, incombination, a piston, a crank shaft, and an oscillating connecting rod connecting the piston to the shaft, with eccentric means interposed between the crank and rod to compensate for the variation in distance between the crank shaft and piston by the oscillation of the rod.

2. Means for equalizing piston displacement in engines, comprising, in combination, a piston, a crank shaft, and an oscillating connecting rod from the shaft to the piston, with an eccentric interposed between the shaft and rod, and means for revolving the eccentric through an angle twice that of the shaft.

3. Means for equalizing piston displacement in engines, comprising, in combination, a piston,-a crank shaft, an oscillating eonfleeting rod from the shaft to the piston, with an eccentric interposed between the shaft and rod, apinion revoluble with said eccentric, and a stationary gear meshing with said pinion, whereby said eccentric is caused to revolve during the revolution of the shaft, the ratio of said pinion and gear being such that said eccentric is caused to revolve twice during a single revolution of the shaft.

4. Means for equalizing piston displacement in engines, comprising, in combination, a crank shaft, oscillating connecting rods from the shaft, pistons'associated with said connecting rods, with an eccentric interposed between each crank of the shaft and the connecting rod, and means for revolving, the eccentrics of the adjacent cranks in opposite directions and through two revolutions for each revolution of the crank shaft.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES CUR-RIE MORISON.

Witnesses:

ALLEN HUGHES, E. S. BELL.