US1909038A - Suction automatic timer - Google Patents

Description

May 16, 1933. J. L.- ARTHUR I 1,909,038

' sucnou AUTOMATIC TIMER Filed Sept. 19. 1928 an I z 33a.-- I I .60 l i 68- 1 g I i A Z 94 '75 80 if n" Qnwnkoo JAMES L. ARTHUR Patented May 16, 1933 UNITED STA ES PATENT OFFICE JAMES L. ARTHUR, OF ANDERSON, INDIANA, ASSIGIIOR TO DEICO-REMY CORPORATION,

' OF DAYTON, OHIO, A CORPORATION OF DELAWARE SUGTION AUTOMATIC TIMER Application filed September 19, 1928. Serial No. 306,959.

This invention relates to ignition apparatusfor internal combustion engines, and has among its objects to provide improved means for controlling the ignition in response to engine load conditions. More part cularly 1t is an object to provide a device WhlCh can easily attached to conventional forms of 1gn1- tion apparatus having either the manual or the speed responsive control of the lgnitlon timer, or both, said device providlnga control of ignition timing in response to engine load.

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

In the drawing:

Fig. 1 is a plan view of the apparatus with the distributor head removed andshowing diagrammatically the fluid pressure connection to the intake manifold of the internal combustion engine.

Fig. 2 is a sectional view of ignition apparatus provided with the present invention and is taken substantially on the line 2-2 of Fig. l.

Fig. 3 is a sectional view through the lgIlltion unit, taken on the line 33 of Fig. 2.

Fig. 4 is a sectional view taken substantial- 1y on the line 4-4 of Fig. 2. I

In the drawing, 20 designates an ignition timer housing provided with a cylindrical shank at 21 adapted to be received by an aperture in an engine frame. Housing 20 is divided by a partition 22 and by a breaker lever plate 23 into compartments '24, 25 and 26, the compartment 26 being covered by a distributor head 27. The shank 21 and the partition 22 providebearings for a hollow shaft 30, which supports at its upper end a speed responsive device 31 of the conventlona-l flat weight type, a type well known 1n the art. This device 31 is connected with a hollow sleeve 32 providing a timer cam 33 and a seat for a distributor rotor 34, and is connected with a shaft 36 which is located within the shaft 30 and capable of relative movement thereto. Sleeve 32 is rotatably mounted movement between the cam 33 and the shaft upon a reduced end 35 of shaft 36. Cam 33 cooperates with a breaker lever 33a.- to separate contacts 331).

The shaft 30 carries a driving gear 37 attached by pin 38. Shafts 30 and 36 are connected by means of'a pin 40 which extends through diametrically opposite spiral slots 41 in shaft 30 and through a longitudinally extending notch 42 adjacent the lower end of shaft 36. Pin 40 is supported at its end by means of a grooved collar 43 slidable axially along the shaft 30.

Motion is transmitted from the gear 37 and from shaft 30 to the shaft 36 by means of the pin and slot connections mentioned. From the shaft 36 motion is transmitted to the cam 33 and rotor 34 by means of the speed responsive device 31 in the usual manner. The device 31 functions to produce relative 36 in response to variations in engine speed. By shifting the collar 43 axially the shaft 36 can be moved relative to the shaft 30 in order to control the ignition timing by means other than in response to variations in engine speed.

The means for shifting the collar 43 includes a lever 50 mounted on a shaft 51 and attached thereto by means of a pin 52. Within the chamber 24 there is located a yoke 53 having its hub 54 attached by set screws 55 to the shaft 51 and having its branches provided with pins 56 for cooperating with the grooved collar 43. The lever 50 constitutes a movable member supported by the ignition housing or support 20', and lever 50 is adapted to be actuated manually or by other means for controlling the timing of the ignition. In conventional types of ignition apparatus such levers are generally connected with the spark lever on the, steering column of an auto mobile in any suitable fashion.

In one of its aspects the present invention provides an attachment for types of ignition apparatus which are provided with a movable member such as the lever 50 for controlling the ignition timing in response to engine 1 load conditions. This attachment includes the bracket 60 which is rigidl mounted or fixed upon the ignition timer housing 20 in any desirable manner. In the present instance the bracket 60 is provided with an arm 61 which is parallelly disposed with respect to the timer unit and forms a support for an expansion chamber 62, which is securely fixed to the arm 61 as by means of rivets 63 passing through the arm and through an end wall of the chamber, member 62. The expansion chamber 62 is preferably of cylindrical cup formation, as illustrated in Fig, 2, and when mounted upon the bracket has its open end normally disposed toward the ignition unit to be controlled.

The open end of the cup member 62 is provided with a cover or closure 64, sealing the chamber 62 to outside air influence, and is retained thereon in any desirable manner. Within the expansion chamber 62 there is provided a pneumatic 65, which may be a bellows having a movable wall or head 66 connected to reentrant curved or folded wall 67, which terminates in a flange 68 securely fixed to the cover member 64. This provides a sealed passage within the cup 62 defined by the end and side Walls thereof joined by the annular portion of the closure 64, and the deformed wall of the pneumatic 65. Through a central aperture of the cover member there is provided a nut or double spring seating member 69 that has a threaded engagement with the cover member 64, as indicated at 70.

The spring seating member 69 is provided with a poly onal head 71 for engagement with a wrenc or other tool for adjusting the same, and has a longitudinal bore 72 enlarged at either end to form spring seats 73 and 7 4, for receiving one end each of the springs 75 and 76 respectively. An operating member is provided for connecting the movable wall of the pneumatic with the timer shifting lever 50, and in this instance takes the form of a link 77. The link 77 is provided at one end with a single nut 78 to engage the threaded end 79, and near the other end with a threaded portion 80 engaged by the abutment or lock nuts 81 and 82, and at the last mentioned end is bent as at 83 to engage an apertured ear 84 in the timer operating arm 50.

The springs 75 and 76 possess distinct features of motive force, and are so designed that their difi'erential capacity, when assembled with the fluid pressure unit and the ignition unit, will make for accuracy and efli'ciency in operation. The difference in their size and motive force will depend principally upon the size and resistance offered to movement by the elements to which they are to be attached. In the particular elements of the ilis obvious if the conditions so favored, the order of spring tensions and sizes might be reversed, but in any instance when in assembled relation the differential force exerted by the advance and the retard springs when coupled with the pneumatic would come to a normal state of rest similar to that illustrated in Fig. 2, and a slight variation in fluid pressure upon the walls of the bellows '65 would cause an adjustment of the spring and rod linkage, inaugurating a change in the" position of the lever '50 which advances or retards the spark delivered by the ignition unit, depending on whether the bellows head 66 moves one way or another.

In assembling the suction control unit, the nuts 81 and 82 are run upon the rod or link 77, then the timer retarding spring 75 is slipped over the rod to engage the stop nuts 8182, and over the rod is then placed the nut 69 so that the spring receiving recess 73 engages the opposite end of the spring 75,

and presents the spring recess 74 for the reception of the timer advancing spring 76 which is then passed over the end of the rod 77. The rod is then passed through the end wall 66 of the pneumatic and threaded with the nut 78 which is preferably secured to the end wall 66 of the pneumatic, as by solder, or other preferred means which will substantially seal the chamber 62 against leakage past the nut 78 and head 66. The nut 69 is then run into the cover 64 to any convenient point which may later be adjusted to suit the existing conditions of operation. The pneumatic 65 with its difi'erential spring assembly is then enclosed by the protective casing 62 and the closure sealed in place. The fluid pressure control unit is now ready to be attached to any of the conventional forms of ignition apparatus to be controlled, it being only necessary to attach the bracket to the unit and connect the rod 77 to the operating lever 50 of the ignition unit.

The suction provided within the cup or chamber 62 and about the pneumatic 65, is connected by a hole 90 through a nipple 91 and thence by the pipe 94 with a passage 95 which is provided by a carburetor 96 attached to an engine intake manifold 97. The nipple 91 is secured in the end wall of the chamber 62 as by the overturned or peened edge 92, and is provided with a coupling 93 which embraces the pipe 94 and clamps it to the nipple 91, making an air-tight connection therewith. The butterfly throttle valve 98 of the carburetor is provided with a shaft 99 operated by a lever 100 and a link 101, which leads to lustrated embodiment, I have shown the rethe manually controlled throttle member at tard spring 75 as the stronger and placed without the suction unit, tending to collapse the pneumatic. The timer advancing spring 76 is shown as the weaker, and is disposed within the suction unit and also within the pneumatic, tending to expand the same. It

the wheel or instrument board of the vehicle. The suction of the engine intake between the. engine and the throttle will be greatest 'when the'engine speed is greatest and the throttle is partly closed, corresponding to conditions driving an automobile at a relatively high speed over a relatively level road. The increase in suction or sub-atmospheric pressure in the intake 97 will result in the more or less expansion of the bellows 65, as viewed in Fig. 2. v

The operation of the invention is as follows: When the engine is operating under partial load, the throttle will be only partly open, therefore the engine intake suction will be higher than when the throttle is wide open. By reason of this, there will be a partial vacuum in the chamber 62 about the pneumatic 65, tending to adjust the linkage between the bellows 65 and the lever 50. The collar 43 will be moved upwardlyfor the purpose of advancing the spark as the engine load decreases; on the other hand, when the engine load increases, the throttle will be opened relatively wide and the suction to the engine intake will decrease, thereby relieving the vacuum of the chamber 62 about the bellows 65 and permitting the spring to adjust the linkage between the bellows head 66 and the timer operating lever 50. This action tends to move the collar 43 downward- ,ly to retard the spark. This action of the collar 43 is based upon the assumption that the rotation of the cam 33 is clockwise, as indicated by arrow A in Fig. 1. If the rotation of the cam 33 were counter-clockwise, it is obvious that the direction of the spiral slots 41 would need to be reversed.

By means of the ignition setting device just described, the degree of spark advance will depend, first, upon the differential tension of the compound spring structure 75 and 76, and secondly, upon the degree of vacuum or suction acting upon the bellows 65 within the chamber 62. A greater vacuum in that chamber will cause a greater advance, and a decrease in vacuum therein will allow the spring assembly to retard the spark. The degree of advance will therefore depend at all times upon the degree of suction in the chamber 62 and about the bellows 65, if one disregards the differential action of the compound springs.

By this structure I have provided a fluid pressure controlling unit which is simple in design, eflicient in operation and that is adaptable to work upon any of the conventional ignition units as. illustrated. The chamber 62 providesaprotective casin for the delicate pneumatic 65, and provi es a unit more responsive to fluid pressure changes than has heretofore been defined. The springs 75 and 76 being-of differential capacity in their motive forces, and the adjustable abutment members 81 and 82 providing a sensitive and sure adjusting feature, that readily adapts the fluid pressure unit to any of the existing timer units. Through the adj ustable spring seat 69, provisionis made for close assignment of the differential values of the springs 7 5 and 76 in relation to the pneumatic 65 as a whole, and enables the operator to condition the apparatus to the degree of sensitivity demand by the circumstances.

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. A fluid pressure controlling unit for attachment to and for controlling the timing lever of an ignition unit, comprising a case; a bracket attached to said case; an expansion chamber mounted on the bracket and having a closure member facing said ignition unit; a bellows within said chamber and mounted on the closure member; a double spring cup adjustably secured to the closure member, and provided with a central aperture; means passing through the spring cup and adapted to operatively connect the bellows with a movable member of the ignition unit; a helical spring about said means within the bellows and seated against the cup tending to expand the bellows; and a helical spring of differential tension embracing said means exterior of the chamber, tending to collapse the bellows.

2. A fluid pressure controlling unit, for attachment to and for controlling the timing lever of an ignition unit, comprising a case;

a bracket attached to said case; an expansion chamber mounted on the bracket and having a closure member facing said ignition unit; a bellows within said chamber and mounted on the closure member; a double spring cup adjustably secured to the closure member, and rovided with a central aperture; means passing through the spring cup and adapted tooperativel connect the bellows with a movable mem r of the ignition unit; differential tensioned helical springs surrounding said means and engaging the bellows andspring cup within the chamber, and the spring cup and an abutment on said means without the chamber.

3. A fluid pressure controlling unit, for attachment to and for controlling the timing lever of an ignition unit, comprising a case;

a bracket attached to said case; an expansion chamber mounted on the bracket and having a closure member facing said ignition unit; a bellows within said chamber and mounted on the closure member; a-double spring cup adjustably secured to the closure member, and provided with a central aperture; springs of differential capacity seated in said cup, one within the bellows to expand the same, and another without the bellows, tending to collapse the said bellows; and means for operatively connecting the bellows with a movable part of the ignition unit.

4. A fluid pressure controlling unit, for attachment to and for controlling the timing lever of an ignition unit, comprising a case;

all

a bracket attached to said case; an expansion chamber mounted on the bracket and having a closure member facing said ignition unit; a bellows within said chamber and mounted on the closure member; a double spring cup adjustably secured to the closure member, and provided with a central aperture; differential spring mechanism within and Without the bellows for resiliently supporting a movable wall of the bellows against the spring cup; and means for operatively connecting the bellows-with a movable part of the ignition unit.

5. A fluid pressure controlling unit, for attachment to and for controlling the timing lever of an ignition unit, comprising a case; a bracket attached to said case; an expansion chamber mounted on the bracket and having a closure member facing said ignition unit; a bellows within said chamber having a movable wall parallelly disposed to said closure member; spring seating means adjustably secured to said closure member; spring means within the chamber tending to expand the bellows; spring means without the cham ber tending to collapse the bellows; and means for operably connecting the movable wall of the bellows with a movable part of the ignition unit.

6. A fluid pressure controlling unit, for attachment to and for controlling the timing lever of an ignition unit, comprising a case; a bracket attached to said case; an expansion chamber mounted on the bracket and having a closure member facing said ignition unit; a bellows within said chamber and mounted on the closure member; and differential means connecting the bellows to control the ignition unit 7. A fluid pressure controlling unit, for attachment to and for controlling the timing lever cl an ignition unit, comprising a case; a bracket attached to said case; an expansion chamber mounted on the bracket and having a closure member facing said ignition unit; a bellows within said chamber and mounted on the closure member, and differential spring means operating with said bellows to control the ignition unit.

8. A fluid pressure controlling unit, for

attachment to and for controlling the tim-.

ing lever of an ignition unit, comprising a case; a bracket attached to said case; an exansion chamber mounted on the bracket and aving a closure member facing said ignition unit; a pneumatic within said chamber and mounted on the closure member, and dif ferential resilient means operating upon the pneumatic to control the ignition unit.

9. A fluid pressure control unit for igni-.-

tion apparatus comprising, in combination, a case; a bracket attached to said case; an expansion chamber; an apertured closure for the chamber; a bellows within the chamber attached to the said closure; a recessed nut tion apparatus comprising, in combination, I

an expansion chamber; an apertured closure for the chamber; a bellows within the chamber attached to the said closure; a recessed nut threaded into the aperture of said closure; an operative for said-bellows carried by said nut, and spring means differentially connected to the bellows and operative for modifyin the control thereof.

'11. A uid pressure control unit for ignition apparatus comprising, in combination, an expansion chamber; an apertured closure for the chamber; a bellows within the chamber attached to the said closure; a recessed nut threaded into the aperture of said closure; an operative for said bellows carried by said nut; a spring bearing against said nut and bellows for expanding the same; and a spring bearing against said nut and a portion of the operative for collapsing the bellows.

12. A fluid pressure control unit for ignition apparatus comprising, in combination, an expansion chamber; an apertured closure for the chamber; a bellows within the chamber attached to the said closure; an operative attached to the bellows and passing through the aperture in the closure member; a recessed nut adjustably received by the said operative and surrounding the operative; spring means between the nut and either end of the operative for differentially applying the fluid pressure exerted in the bellows to the operative.

13. A fluid pressure control unit for ignition apparatus comprising, in combination, an expansion chamber; an apertured closure for the chamber; a bellows within the chamber attached to the said closure; an operative attached to the bellows and passing through the aperture in the closure member; a recessed nut adjustably received by the said operative, and surrounding the operative, and differential spring mechanism engaging the nut, the bellows and the operative.

'14. A fluid pressure controlling unit for attachment and for controlling an ignition timer, comprising in combination an expansion chamber; a pneumatic within the chamber havingits base ortion fixed to an apertured wall of the chamber; means supporting the chamber so as to face the said timer; an operating member attached to the movable wall of the pneumatic and extending through the aperture of said chamber wall for connection to said timer; spring seating means reciprocably engaging said member and threadedly engaged by said chamber wall; an expansion spring within the pneumatic seated against the movable pneumatic wall and the said means; and a collapsing spring without the pneumatic seated against the said means and an abutment on said member.

15. The mechanism recited in claim 14, in which the expansion and collapsing springs are of differential capacity.

16. The mechanism recited in claim 14, in which the spring seating means is ad'ustable to vary the diflerential relation of tiev fluid pressure unit.

17. Themechanism recited in claim 14, in which the collapsing spring is characterized by the greater motive force.

18. llhe mechanism recited in claim 14, in which the abutment of the collapsing spring is adjustable to vary the differential relation of the fluid pressure unit.

19. Ignition apparatus comprising, in combination, an ignition circuit interrupter including a circuit breaker lever and an engine driven cam for operating the lever, means responsive to engine suction for effecting an angular adjustment between the cam and lever, said means including a. suction chamber and a displacement member therein, differentially acting springs for controlling the displacement member, and means for concurrently adjusting said springs.

20. Ignition apparatus comprising, in combination, an ignition circuit interrupter including a circuit breaker lever and an engine driven cam for operating the lever, means responsive to engine suction for efre cting an angular adjustment between the cam and lever, said means including a suction chamber and a displacement member therein, means supporting said chamber so as to face said interrupter, a linkage between the displacement member and said lever, (lif ferentiaiiy acting springs for controlling the dispiacement member, and means for concurrently adjusting said springs.

Q1. ignition apparatus comprising, in combination, an ignition circuit interrupter including circuit breaker lever and an engine driven cam for operating the lever, means responsive to engine suction for eifecting an angular adjustment between the cam and lever, said means including a suction chamber and a. displacement member therein, an adjustable nut carried by the chamber, difierentially acting s rin seated on the nut for controlling t e displacement member, said nut providing means for concurrently adjusting said springs.

22. Ignition apparatus comprising, in combination, an ignition circuit interrupter including a circuit breaker lever and" an engine driven cam for operating the lever, means responsive to engine suction for effecting an angular adjustment between the cam and lever, said means including a suc- JAMES L. ARTHUR.

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