US1095421A - Reversing-gear for internal-combustion engines. - Google Patents

Description

J. ROMBYN. REVERSING GEAR FOR INTERNAL GOMBUSTION ENGINES. APIfLIUAT ION FILED SEPT. 2, 1913.

1 95,421 Patented May 5, 1914.

wiZmeJJ'e COLUMBIA PLAND'GRAPH 60.. WASHINGTON, D. c.

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JEAN ROMEYN, 0F BRUSSELS, BELGIUM.

REVERSING-GEAR FOR INTERNAL-COMBUSTION ENGIN ES.

Specification of Letters Patent.

Application filed. September 2, 1913.

Patented May 5, 1914. Serial No. 787,662.

To all whom it may concern:

Be it known that I, JEAN ROMEYN, engineer, a subject of the King of Belgium, and residing at (56 Avenue Jean Volders, Brussels, Belgium, have invented certain new and useful Improvements in Reversing- Gears for Internal-Combustion 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, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to an improved reversing gear for internal combustion engines of the type adapted to be changeably worked.

by means of air and fuel.

It is well known that with internal combustion engines having light fiy-wheels and adapted to be changeably worked by means of air and fuel there is, when changing from working with air to working with fuel, danger of an untimely stoppage of the engine due to spark failures, often produced at the first few revolutions and, to avoid this it is usual to divide the cylinders of the engine into two or more-groups in which the transition from working with air to working with fuel is effected at different times, this change being usually made, as is often done in the case of stationary engines, by shifting the point of suspension of the control levers gear by means of an eccentric. To allow the engine to revolve in either the one or the other direction it is usual to provide the cam shaftwith two sets of cams one for ahead the other for reverse, and by longitudinally shifting the cam shaft either the one or the other set of cams is brought into engagement with the levers and simultaneously the other set becomes inactive.

The object of the present invention is to provide a simple and efiicient gear by means of which all the eccent-ricscarrying the levers for all the cylinders of all the groups can be operated in essentially any desired sequence. For this purpose two or more cranks are keyed on the same shaft, and each drives a special lever for each group of cylinders, a connecting rod being jointed to each crank and a further connecting rod being jointed to each lever said connecting 13, are adapted for control ahead rods being pivotally connected together and guided at the point of junction by a link motion in a manner that the lever remains motionless during a part of the stroke of the crank.

In order that this invention may be clearly understood I have hereunto appended an explanatory sheet of drawings, wherein for the sake of clearness the device is shown as applied to an internal combustion engine having its cylinders divided into two groups each group "containing but one cylinder, these cylinders being represented by I and II. p

Figure 1 represents a longitudinal elevation of the valve gear. Fig. 2 is a section on the line A, A of Fig. 1 in the direction of the arrow B.- Fig. 3 is a section on the line A, A, of Fig. 1 in the direction of the arrow C. v

The cam shaft, 7 carried-by the bearings, 8, is common to all the cylinders of the motor and the shaft, 9, supporting the distributing levers and carried by the bearings, 10 is common to all the cylinders of the group I, while the shaft 9, analogous to the shaft, 9, is common to allthe cylinders of group II. The shaft, 7, carries, for each cylinder of group I cams, 11, 12, 13, 14:,and for each cylinder of group II cams, 12, 11', 14, 13, the cams, 11, 11, being adapted for control ahead on air, and the cams, 12, 12', for control reverse on air, while the cams, 13, on fuel and the cams, 14:, 14, for control reverse on fuel. The shaft, 7, may be shifted longitudinally by means of a lever, 15, and may be locked in either of two positions by means of the usual locking device, 16, adapted'to engage with either of two notches, 17 and 18.

19 represents the gear for actuating the shaft, 7.

The shaft, 9 carries, for each cylinder of the group I, an eccentric, 20, serving to support both a lever 21, intended to depress the rod 22 of the air valve, and a lever, 23, intended to lift the injection pin, 24, and'the shaft, 9, carries for each cylinder of the group II an eccentric, 20, shown in clottedlines Fig. 1 serving to support both a lever, 21, intended to depress the air valve, and a lever, 23, intended to lift'the injection pin. lVhen the eccentrics, 20, 20 are set along the line a, a, respectively, the rollers of the levers, 21., 21, and 23, 20, are sufliciently distant from the cams to avoid contacting with the same. If however, the eccentrics are turned to set along the lines, Z), 5, r c, c the levers 21, 21 or 23, 23, respectively come in contact with the path of travel of the corresponding cams according to the longitudinal position of the shaft, 7.

The cams are arranged in such a manner that, when the locking device 16 is in engagement with the notch 17, either the cams 11 and 11, for ahead on air operate the levers 21 and 21, or the cams 13 and 13, for

. ahead on fuel operate the levers 23 and 23,

according as the eccentrics 20 and 20 are set along the lines 6, b, or along the lines o, c. On the other hand, when the locking device 16 is in engagement with the notch 18, the cams, 12, 12', for reverse on air or the cams i l, 14 for reverse on fuel are brought into action.

The arrangements described above comprising the cam shaft with double set of cams, and levers carried by eccentrics, are well known.

The present invention relates to the device described hereafter and which is intended to control the combined workings of the shafts, 9 and 9. A shaft 28 carried in bearings 27 has mounted thereon two cranks, 29, 29, and a worm wheel 25, and is adapted to be rotated by means of a worm, 26, engaging said worm wheel. The free ends to the cranks, 29, 29, are connected to rods, 31, 31, which are pivotally connected with connecting rods, 32, 32, which latter are also connected with the levers, 30, 30. The pivot joints connecting the rods 31 and 32 and 32 and 32 are adapted to move in suitably shaped slots in fixed guides 34 and 34. i

Let a, a, b, b, 0, c, be the center lines for the positions of the levers 30, 30, when set to start to work with air, and to work with fuel respectively, and let R be the length, from center to center, of the connecting rods 32, and 32, and a a points in the slots of the guides 34L, 34:, respectively situated at a distance It from the points a a,.

The circle described by the extremity of the crank 29 is divided into 6 equal parts in such manner that two points of division, 5 and 2, the center of the shaft 28 and the point a fall on the same straight line. The length of the rod 31, is such that the roller 33 occupies the position a when the crank pin is found at the point 06. It will be observed that the roller will return to the same point (4 when the pin of the crank assumes the position 4. At the end nearest the shaft, 28, the slot in the guide 34, causes the roller 33 to move along an arc of a circle 0 traced with 0,, as center and R as radius, while at the other end, it causes the roller 33 to move along the arc of a circle 5 traced with 6,, as

center and R as radius. The lengths of two portions of the slot coinciding respectively with the arcs of the circles 0 and b are such that the end of the lever 30 is brought into 5,, while the crank pin traverses the are 1., 2, 3, and it is brought into 0,, when the crank pin is found in 5. It is to be observed that, in the positions 3, 1., 2 and the gear is non-reversible. The circle described by the extremity of the crank 29', is divided into 6 equal parts so that two points of division 1., and. t, the center of the shaft 28 and the point (4,. fall in the same straight line. The length of the rod 31', is such that the roller 33 occupies the position a,, when the crank m1 is found in 0-6. It will be observed that the roller 33 will return to the same point. a, when the crank pin assumes the position 2. At the end nearest the shaft 28, the slot in the guide 34: causes the roller 33 to move along the arc of a circle a, traced with c, as center and R as radius, while at the other end, it causes the roller 33 to move along the are of circle 6, traced with Z), as center and R as radius. The lengths of the two portions of the slot 34 coinciding re spectively with the arcs of the circles 0' and I), are such that the extremity of the lever 30 is brought back into Z), when the crank pin is found in I, while it is maintained in a, during the time that the crank pin traverses the are 3 --4: -5 It is to be observed that in the positions 1 3 4E and 5, the gear is non-reversible.

The internal combustion engine comprising essentially the previously described parts is erected with the cranks 29 and 29' set the one with regard to the other so that the crank 29 is found in 06 when the crank 29 is found in 06', and in a manner that in this position, all the levers are remote from the cams.

The shaft 7 may be shifted at will by means of the lever 15 in order to reverse. If, starting from the position 06--0-6, the shaft 28 is turned in the direction of the arrow, the effect is in the position 1-1: the starting with air of all the cylinders; in the position 2-2: the starting with air by means of the group I and the inaction of the group H; in the position 3-3: the starting with air by means of the group I and the working with fuel in the cylinders of the group H; in the position Mr the inaction of the group I and the working with fuel in the cylinders of the group II; in the position 5-5: the working with fuel in all the cylinders.

To stop the machine it is suflicient to continue the rotation in the same direction in order to come back to the position 0-6- 06. A similar effect, only with engine reversed, can be obtained by moving the shaft longitudinally toward the right.

Of course if desired it can be arranged,

without departing from the spirit of my invention, to efiect the change in essentially any other desired sequence.

Claims:

1. In a reversing gear for internal combustion engines, the combination with two or more groups of cylinders adapted to be worked alternately by gas and air and an operating lever for each group of cylinders, of a crank for each group, articulated rods connecting the cranks and operating levers, and means to so guide the connecting rods at their point of connection that the operating levers remain motionless during a por tion of the stroke of the cranks.

2. In a reversing gear for internal combustion engines, the combination with two or more groups of cylinders adapted to be worked alternately by gas and air, and a separate operating lever for each group of cylinders, of a shaft, two or more cranks keyed on said shaft, pivotally connected rods connecting the levers to the cranks, and

guides for the pivots of said rods adapted to render the levers motionless during a portion or the stroke of each crank.

3. In a reversing gear for internal combustion engines, the combination with two or more groups of cylinders adapted to be worked alternately by gas or air, and a separate operating lever for each group of cylinders, of a shaft, two cranks keyed on the latter, a connecting rod jointed to each crank, a connecting rod jointed to each lever, a pivot connecting each pair of rods, fixed guides having a slot therein to receive the pivots and arranged to render the levers motionless during a portion of the stroke of each crank.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

J EAN ROMEYN.

Witnesses:

FELIX Dn COsMAN, JosErH CUTERs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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