US1759437A

US1759437A - Ignition apparatus

Info

Publication number: US1759437A
Application number: US210822A
Authority: US
Inventors: William A Chryst
Original assignee: Delco Remy Corp
Current assignee: Delco Remy Corp
Priority date: 1927-08-05
Filing date: 1927-08-05
Publication date: 1930-05-20
Anticipated expiration: 1947-05-20

Description

May 20, 1930.

W. A. CHRYST IGNITION APPARATUS Filed Aug. 5, 1927 Patented Ma go; 19 30 UNITED \STATES PATENT OFFICE wnzLrA'n A. CHBYST, or nAx'ron, OHIO, ASSIGNOR .ro DELCO-REMY coRPoRArIoN,

or DAYTON, OHIO, A CORPORATION or DELAWARE IGNITION AIPIARATUS Application filed August 5, 1927. Serial No. 210,822.

This invention relates to ignition apparatus for internal Combustion engines. I

One of its objects is to provide for the con: trol of ignition timing in response to englne operating'conditions, so that a timing of the ignition will be advanced as the engine speed increases and will be retarded as the engine load increases and vice versa.

A, further object is to provide an ignition timer and distributor unit including. a centrifugal device for controlling the angular relation of the timer cam to the drive shaft and also a device responsive to engine suctionfor controlling this relation, each device being operable independently and capable of operating cumulatively to control the tuning of ignition.

Further objects and advantages of the present invention will be apparent from the the accompan following description, reference being had to ing drawings, wherein a preferred form o embodiment of the present invention is clearly shown.

In the drawings:

Fig. 1 includes a longitudinal sectional view of an ignition timing apparatus embodying the present invention and a diagram ona smaller scale showing the manner of connecting the suction control with an engine intake fuel passage.

Fig. 2 is a plan view on the line 2-2 of- .Fig. 1, the timer housing and distributor being removed.

Fig. 3 is a plan view ofthe timer with the distributor rotor and head removed. Figs. 2 and 3 are drawn to a smaller scale than Fig. 1. y

In the drawing, 20 designates a cup-shaped housing having a bearing 21 for supporting a drive shaft 22 having a helically-splined portion 23 and a smooth portion of smaller diameter 24. The splined portion 23 is threadedly engaged by nut 25 drivingly connected with a dished plate 26 having a flange 27. The flange 27 supports studs 28 each providing a pivot for a weight 29. Each weight 29'com-prises a plurality of laininations 30 secured by rivets 31, one of which extends through aslot 32 in the flange 27. This rivet 31 is provided with an extension 33 for receiving one end of a spring 34 attached at its other end to an extension '35 of oneof the studs 28 as shown in Fig. 1'. The spring 34 yieldingly urges the weights 29 toward the axis of the shaft 22. Each weight includes a notched portion 36 for receiving a finger 37 extending from. a shaft 38 having a central bore 39 for receiving the smooth portion 24 of the shaft 22.

The shaft 38 has a portion of smaller diameter 4O journalled in a ball bearing 41 which is supported by a timer cup 42. The cup 42 insulatingly supports a breaker plate 43 having an upright car 44 for supporting an adjustable screw 45 carrying a contact 46. The contact 46 is engaged by a contact 47 carried by lever 48 pivoted at 49. The lever 48 carries a roller 50 for following the cam 51 attached to the shaft 40. A spring 52 hearing against the timer cup 42 and connected by a pin 53 with the lever 48 urges the lever toward the cam and also provides a ground connection between the contact 47 and the timer housing. The cam 51 drives a distributor rotor 54 cooperating in the usual manner ignition as the engine load increases or as the suction of the carburetor increases, comprisesa device which changes the angular relatlon between the nut 25 and the shaft 22 by moving the nut up and down along helicallysplined portion 23' of the shaft. This device therefore comprises a plate 60 which has a central aperture'for receiving the nut 25 and which fits loosely in an annular groove 61 between the nut 25 and the bottom of the cupshaped plate=26. The plate 60 is attached to an outer metal bellows 62 and an inner metal bellows 63 which in turn are attached to a bottom. plate 64 supported by the bottom of the housing 20. The space between the bellows 62 and 63 provides asuction chamber 65 which is connected by the

pipes

66 and 67 and passage 68 in the carburetor 69 with a fuel intake pasage 7 O of the carburetor. As 5 the engine load increases requiring the openingofthe carburetor throttle 71, the suction in the carburetor passage 70 willincrease and likewise the suction in the chamber 65. Therefore the plate 60 and nut willbe 14f moved downwardly to cause the nut and parts driven thereby including the we1ghts 2? to be moved in a counterclockwise directlon as -viewed in Fig. 2. Therefore the timing of the spark will be retarded with increase 1n suction in the'carburetor due to increasing engine load. 7 As the engine load decreases and the throttle 71 is moved nearer to closed posit on to govern the engine, the suction in the earburetor anterior to the throttle will decrease, thereby permitting the bellows to move the plate 60 upwardly due to their own reslhency. This action will cause the rotation of the weights relative to the shaft 22 to be clock- 5 wise as viewed inFigs. 2 and 3, in order to advance the spark as the load decreases:

It will be noted that each device controlling the timing of ignition may operate independent-1y of the other. The angular movement.

of the nut 25 relative to the shaft 22 does not affect the amountpf angular movement of the cam 51 relative to the nut 25. For example, if both speed and load increase, the centrif: ugal device could operate to advance the spark while the suction responsive device could operate to retard the spark. If the speed be increased as the load decreases, both devices will operate to advance the spark, and the total amount of advance will be the sum of amounts of advance effected by each device separately.

, Thus both control devices operate independently in order to effect a joint control of the spark timing. 1

While the form of embodiment of the present invention as'herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the'claims which follow.

What is claimed is as follows:

- 1. Ignition apparatus'com breaker operatedjby a rotata 1e cam, a drive shaft, an intermediate drive'element through which rotation istransmitted from theshaft member to the cam member, means comprising an annular expansion chamber responsive to engine loadconditions for varyin the angular relation between the interme 'ate element and one of the members, and means responsive to engine speed for varying the angular relation between the intermediate element and the other of said members.

- breaker operate shaft having a he 'cally splined portion, a

rising a circuit nut movable axially along said splined portion, speed responsive means for connecting the nut with the cam, while permitting the nut to move axially and to turn relative to the shaft, and means responsive to engine load conditions for moving said nut.

3. Ignition apparatus comprising a circuit breaker operated by a rotatable cam, a drive shaft having a helically splined portion, a nut movable axially along said splined por- 75 tion, means forv connecting the nut with the cam, while permitting the nut to move axially and to turn relative to the shaft, and means responsive to engine load conditions for moving said nut. T w

4. Ignition apparatus for internal combustion engines comprising, in combination, an interrupter, a cam for operating theinterrupter, a drive shaft, a member movable axially along the shaft, means for connecting the member with the shaft so as to turn the member relative to the shaft as it moves along the shaft, means responsive to engine intake suction for moving said member and including an annular displacement chamber substantiallycoaxial with the drive shaft and havinga movable wall connected with said axially movable member, said means being responsive to variations in engine load-conditions for moving'said member, and means responsive to variations in engine speed for connecting saidmemberand cam and forchanging the angular relation between them.

5. Ignition apparatus according to claim 4 in which the speed responsive means are 1 supported directly by the axially -movable memberand are movable therewith.

6. Ignition apparatus according to claim 4 in which the axially movable member is a nut threadedly connected with the drive shaft.

7 Ignition apparatus for internal combustion-engines comprising, in combination, an

interrupter, a cam for operating the interrupter, a drive shaft, a member mo vable alon the shaft, means connecting the member an cam, means for connecting the member and shaft and for causing the member to rotate relative to the shaft as it moves along the shaft, and means responsive to variations in 1 pressure in the engine intakefor moving the member, and including" as uction chamber provided by two spaced concentri metal belows and an annular disc to whiclt' the ends of the bellows are fixed anduto which the 1 2 v axially movable member is *connected.

8. Ignition apparatus for internal combustion' engines comprising, in combination, an r interrupter, a cam for operating the interrupter, a drive shaft, anintermediate drivemembersurrounding the drive shaft and supported thereby for rotation relative thereto, 2. Ignitionaplparatus comprising a circuit i b a rotata 1e cam, a. drive a cam-carrying shaft surrounding the drive shaft and supported thereby for-'rotationrelative thereto, means responsive to variations in engine intake suction for connecting the intermediate drive-member with one of the shafts and for changing the angular relation between them, and other means for connecting the intermediate drive-member with the other of said shafts and for changing the angular relation between them.

9. Ignition apparatus for internal combustion engines comprising, in combination, an interrupter, a cam for operating the interrupter, a drive shaft, an intermediate drive member surrounding the drive shaft and supported thereby for rotation relative thereto, a cam-carrying shaft surrounding the drive shaft and supported thereby for rotation relative thereto, means responsive to variations in engine intake suction for connecting the intermediate drive-member with one of the shafts and for changing the angular relation between them, and means responsive to variations in speed for connecting the intermediate drive-member with the other of said shaftsand for changing the angular relation between them.

10. Ignition apparatus comprising a circuit breaker operated by a rotatable cam, a drive shaft, an intermediate drive element through which rotation is transmitted from the shaft member to the cam member, means comprising an annular expansion chamber responsive to engine load conditions for varying the angular relation between the intermediate element and one of the members,'and means movable axially of said shaft and responsive to engine speed for varying the angular relation between the intermediate element and the other of said members.

In testimony whereof I hereto affix my signature.

WILLIAM A. CHRYST.