US1941342A

US1941342A - Ignition apparatus

Info

Publication number: US1941342A
Application number: US580277A
Authority: US
Inventors: John B Dyer
Original assignee: Delco Remy Corp
Current assignee: Delco Remy Corp
Priority date: 1931-12-11
Filing date: 1931-12-11
Publication date: 1933-12-26
Anticipated expiration: 1950-12-26

Description

Dec. 26, 1933. J DYER I IGNITION APPARATUSF Filed Dec. 11, 1931 Qwww m 5 0 MM r0 24 piston toward the right for retarding the spark I Patented Dec. 26, 1.933 r PAT-Eur rem 1,941,342 I NI'rroN'APPARATUs ticn'of Delaware.

Application Decemberll, 1931 -ffSe'ria l No. 580,277

forms; (o1. 123 -117) This invention relatesto ignition apparatus forinternal combustion engines. Q f One of its objects is to control .the'timing of theignition in response to pressure in the engine 5 combustion chamber. f Morefparticularly it is an object of the invention to retardthe spark so as to prevent det'onaation and consequent lo'ssiof power'while maintaining'the greatest amount of spark advance. consistent with engine performance.

In order to accomplish this object the present invention provides cooperating cylinder and piston members, the former'being connected to an engine cylinder and the latter to the'interrupter support of the ignition timer." Movement of the is resisted by a spring which restrains movement of the piston from a spark advancing position to a spark retarding positionuntil the pressure too great spark advance I the" spark is retarded so as to prevent the occurrence-of detonation and loss of power.

invention will'be apparent f'rom the following description, reference being had to the accompanying drawing wherein a preferred embodi merit of ionejfer'm of the present. invention is clearly shown. I I I In the drawings W The figure of the drawing is' a diagram 11115 trating the present invention. a I Referring to the-drawing,- the ignition apparatus comprises a coil 20' having a primary winding 21 and a secondary winding 22, The primary 21 is connected by aswitch 23 with a battery 24 grounded at.-25 and is connected by a wire 26 with a terminal 27 of an ignition timer. The

terminal 27 is connected by aleaf spring con-.-

ductor 28 with a circuit breaker lever 29 pivoted at 30 upon plate 31'which is rotatable about the axis of a shaft 32'which drives theignition timer cam 33. The cam 33 cooperates with a rubbing block 34 attached togetherwith one end of the conductor 28, to the circuit breaker lever 29. Lever 29 carries a contact 35 cooperating with a grounded contact 36. The normal direction of the rotation of the cam 33 isclockwise as indicated by arrow 37. Hence, to advance the spark the circuit breaker lever plate 31 is rotated counter-clockwise, and clockwise to retard the spark. I

The means for controlling the angular relation 'tain the piston 42 substantially in the left-hand in the combustion chamber of the engine'riss substantially to the point of detonation. Thus I when the detonation would tend to occur. due'to' iFurther objects and advantages of the 'prese'nt .the spring 43.

between the p1ate31 and the cam 33 responsive to engine combustion pressures comprises a cylinder 40 extending from atirner housing 41 and cooperating with a piston 42 attached to'a rod 43 passing through athreaded bushing 44 and attached by a pin 45 witha link 46 connected; by pin 47 with the'circuit breaker plate 31.- A spring 48 is located between'the piston 42 and the bushing 44 and is of such strength as to mainposition shown in the figure until the engine cy1- inder pressure has increased substantially to a point where detonation would begin to occur. The cylinder 40 is connected by a pipe 49 with an engine cylinder or combustion chamber 50j The left-handwall of the cylinder 40 providesa seat 51 for a disc valve 52 having notches 53 at its periphery and a central bleed hole 54. A spring 55 located between the, piston 42 and the valve 52 tends to retain the valve upon its seat; Since the engine explosions occur intermittently the piston 42 is subjected intermittently to increases of pressure. As the pres'sure'fincreases in the engine cylindervalve 52 'opensto' admit combustion products under pressure to theleft-hand endflof thepiston 42, thus'tending to drive the piston toward the right; When the combustionpressure decreasesin the enginecylinder, the valve 52is closed by the spring 55. Since the bleedhole 54 in ,the valve'52. is relatively small, the pressure confined in the cylinder 7 40 is'substantially"retained during the period between explosions so that there is relatively little fluctuation of the piston 42. Hence the piston 42 tends to remain in the position .to which it was driven by a preceding explosion in the engine cylinder 50. 1' i i As the amount 0 workdone in the engine cylinder increases ,the'peak of the combustion pres sure increases; thereby "increasing the pressure upon the piston 42 and still further compressing So long as detonation does not occur there will be relatively little compression of spring 43, but when there a tendency for the explosive mixture to detonate, when explod- 1100 ing, the peak of detonation pressure is far in excess of peak pressure before detonation occurs. The peak pressure of detonation although of short duration, is transmitted to the piston 42 and that explosion will not detonate because the spark has been retarded. Then, since the spring 48 is not opposed by a detonating pressure the forms might be adopted, all coming .within the scope of the claims which follow.

What is claimed is as follows:

1. Ignition apparatus for internal combustion engines comprisingin combination, a circuit interrupter for controllingan ignition coil, an engine driven camjfor operating the interrupter, and. means- .responsive to engine combustion chamber pressure .for controlling the angular relation between .the'interrupter and cam, said meanscomprisinga .cylinder connected with an engine cylinder, a piston in said cylinder, a spring establishing an .alterable predetermined spark advance relation between the 'iinterrupter and cam, and -restraim'ng movement of the piston from .the'spark advancing position to a spark retarding position until the engine cylinder pressure risessubstantially to the point of detonation and .means effective .just after detonation tending to restore the predetermined spark advance relation, whereby the ignition will be timedto effect engineperformance atcombustion pressures below the detonating' point.

2. Ignition apparatus for internal combustion engines comprisingin combination, a circuit interrupter for controlling'an ignition coil, an engine driven cam for operating the interrupter, and means responsive to engine combustion chamber pressure for controlling the angular relation between the interrupter and cam, said means comprising a-cylin'der connected with. an engine cylinder, a piston in said cylinder and a spring restraining movement of thepiston from 1 a spark advancing position to a spark retarding position until the engine cylinder pressure rises substantially to the point of detonation whereby the ignition will be timed to eiiect engineperformancev at combustionpressures below the detonating point; and mwns for damping movements of the piston due tointermittent application of pressures to the cylinder.

3. Ignition apparatus for internal combustion engines comprising, in combination, a circuit interrupter for controlling, an ignition coil, an

ya, sparkadvancing position to a spark retarding position until the engine cylinder pressure rises substantially to the point of detonation whereby the ignition will be timed to effect engine performance at combustion pressures below the detonating pointyand a check valve for controlling the passage between the control cylinder and engine cylinder, said check valve having a bleeder passage. 7

4. Ignition apparatus for internal combustion engines comprising, in combination, a circuit interrupter 'for controlling an ignition coil, an engine driven cam for operating the interrupter, and means responsive to engine combustion chamber pressure 'for "controlling the angular relation between the "interrupter; and" cam, said means comprising a cylinder "connected with an engine cylinder, 2, piston in said cylinder and a spring restraining movement or the piston from a spark advancing position'to aspark retarding position until'the engine cylinder pressure rises substantially to the point of detonation whereby the ignition will'be timedto 'effect'engine performance at combustion pressures below the detonating'point; and a check valve for'controlling, the passage between the control cylinder and the engine cylinder, said valve including a'valve disc having a'bleederpassage, and a spring located between the control piston and valve disc for urging the "disc against its seat.

5. Ignition apparatus 'for internal "combustion engines "comprising; in combination, a circuit" in terrupter" for controllingan ignition coil, an en gine driven cam for operating the interrupter, means responsive to engine combustion chamber pressure for controlling the. angular relation between' the interrupterand cam, saidm-eans comprising a pressure responsive element, means for communicating thepressure ofthe en'gi'ne-cylinderto said element, a spring restraining move-- ment of "said element from a spark advancing position to a'spark retarding positionuntil'the' engine cylinder pressure rises substantially to the point of detonation and meansacoelertzting the return movementof said element from a spark retarding posit-ion toward'a spark-advancing position duringthe-intervalbetween successive'detonations, whereby, the ignition will be timed to effectengine performance at-combustion pressures below the 'deton atin'g point.

JOHN B. DYER.

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