US1312991A

US1312991A - Starting system for engines

Info

Publication number: US1312991A
Authority: US
Publication date: 1919-08-12
Anticipated expiration: 1936-08-12

Description

A. KAZENMAIER AND E. BAUER.

STARTING SYSTEM FOR ENGINES.

APPLICATION FILED FEB. I2. IQIGI 1 3 1 2, 99 1 Patented Aug. 12, 1919.

w (L'WIIOW UNITED STATES PATENT OFFICE.

AUGUST mammmn AND EUGEN BAUER, or STUTTG-AB'I, emm, assrenons, BY MESNE ASSIGNMENTS, To AMERICAN BOSCH unonn'ro conronn'rron, or new YORK, a. Y., A oonrommon or NEW YORK.

s'rm'rme SYSTEM r012. aromas;

Specification of Letters Patent.

Application filed February 12, 1916. Serial 1T0. 78,058.

To all whom it may concern:

Be it known that we, AUGUST KAzaN- MAIER and EUGEN BAUER, both subjects of the Emperor of Germany, residing at and whose postofiice addresses are, respectively, Pfeiiferstrasse 4 and I-Iirschstrasse 37, n Stuttgart, Germany, have invented certain new and useful Improvements in Starting Systems for Engines;-and we 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.

In motor starting systems for engmes, wherein speed reducing gearing of comparative] large ratio is generally used, there is considerable back lash or play between the motor and the engine, so that upon connecting the source of power supply to the starting motor, the absence of load in the initial eriocl in which the play is taken up results in the fact that the motor starts with a rush, especially since. a series electric motor or other motor having the same characteristic high starting torque is used. The speed developed in this initial period-is such that when the play is taken up, the momentum of the parts then in rotation, together with the starting torque of the motor, is suddenly applied to the engine, with the result that severe strains may be developed in the apparatus and a noisy and unsatisfactory operation necessa'rily ensues. This is particularly true if the gearing between the motor and engine includes an over-running clutch to automatically disengage them at the proper time. 1 4

Our invention overcomes the objections due to the rush of the motor in the initial starting period and the sudden application of an excessive starting torque to the engine when the play has been taken up, and we do this by supplying in the initial starting period an amount of power sufficient to turn the motor at "slow speed and develop the small torque'required for overcoming the resistance encountered in takingup the play in the gearing, but not sufficient to start the engine from rest, and then increasing the supply of power-to the full value necessary to start the engine from rest. .The rotating members of the over-runnin clutch are connected in this initial perio or revious thereto, so that the play in the clutc also is entirely taken up before'the motorstarts to develop the Increased power. In case the starting system is applied to an internal Patented Aug. 12, 1919.

combustion engine wherein a supplementary ignition system is provided for furnishing lgnitlon-voltages during the starting period of the engine, the arrangement is, in its preferred form, such that the ignition system is started into operation at the time the supply of power is increased. We use a controller for compelling the sequence of opera tions pointed out above, and in the preferred arrangement, the controller is operated in a single stroke from its inoperative position. For instance, in the case of an electric" starting system, a normally open switch has a succession of positions. In the first position, the rotating members of the clutch are 'connected by an electro-magnetically-operated brake supplied with current from a battery. In the same position or the next one, as desued, the motor is supplied from the battery with current limited by a resistance to an amount sufficient for developing the small torque required to turnthe motor slowly to take up the play in the gearing, but insufificient to start the engine from rest. In the final position of the switch, full power for the motor is supplied from the battery and the supplementary ignition system is started into operation with current from the battery. n all these positions, the flow of current the brake ismaintained so that the rotating members are connected during the entire starting period.

The accompanying drawing illustrates the preferred embodiment of our invention in application, as an example, to an electric starting system for an internal combustion engine, wherein an over-running clutch is included in the motor gearing. In this system, the storage battery a has one terminal grounded and the other terminal connected to the central conducting segment 5 of a foot switch suitable for use on an automobile or motor boat. The switch shaft 0 carries two conducting bridge members (1,, d, insugaged by the bridge member al whereas the segmental: and Z are arranged in line on the mem opposite side of segment b so as to be engaged by the bridge member d The segment h is connected to the insulated terminal of the grounded winding 0 of the electromagnet 1), Whereas the segment Z is connected through the resistance m to the segment is and also to the insulated terminal of the grounded series motor n. The segment i is connected to the supplementary ignition system embodying an electromagnetic interrupter 1' of high periodicity suitable for generating sparking voltages in the armature winding 8 of the magneto at each period of interruption of the mechanical interru ter 00.

he starting motor a drives the gear 14 which is meshed with the rotatable member 11 of the over-running clutch, the rotatable member 13 being permanently connected to the crank shaft 16 of the engine and being disengageably connected with the rotatable member 11 through the connecting element 12 carried by the rotatable intermediate member 10. This over-running clutch is similar in construction and operation to the one illustrated in Fi 3 and 4 of Patent No. 1,259,876, issued arch 19, 1918. In the construction shown herein, the brake 15 is applied to the member 10 when the winding 0 of the electromagnet p is energized, and when so applied, the connecting element 12 is moved into position to positively connect the two

rotatable members

11 and 13.

The-operation is as follows: In the position illustrated, the switch is open, the ro tatable elements of the over-running clutch are disengaged, and a considerable amount of play or back lash exists in the gearing between the motor and the engine. In order to start the engine from rest, the operator depresses the switch shaft 0. When the bridge members d d occupy the position shown in broken lines at I, current. flows from the battery a through the segment I and bridge member al to the segment h of the winding 0, whereupon the electroma et enga es the brake 15 with the interme iate r 10 of the clutch and thereb causes the rotatin running 0 utch to become positively connected and turn together as soon as the pla in the gearing is ta en up. When the switcii reaches the second position shown in broken lines at II, the bridge member d is in engagement with the segment is, and in addition to the current flowing to the winding 0 of the electroma et, current also flows from the battery a t rough the resistance m to the motor n. The resistance m is so calibrated that the current flowing through it at that time starts the motor into slow rotation and develops sufficient torque to take up the play in the gearing between the motor n and the crank shaft 16 of the engine, butnot sufiicient torque to start the

engine members

11 and 13 of t e over-'- over-running clutch between t from rest. For instance, if the switch is held in position II the motor will come to rest after the play has been taken up. However, the operator continues the stroke of the switch shaft 0 and finally depresses the bridge members (A, d to the position shown in broken lines at III. In this position the bridge member (1 connects the segment I) 'i 'motor then starts the engine from rest and brings it to a speed at which it develops its own power, the supplementary ignition system generating satisfactory ignition voltages to ignite the combustible mixtures drawn into the engine cylinders.

As soon as the speed of rotation of the engine shaft 16 exceeds the speed of rotation of the member 11, the connecting element 12 disconnects the clutch, whereu on the switch shaft 0 is released to its ralsed position, and all. the circuits from the battery are interru ted. The notches '0 'v, and '0 are engaged y the spring-pressed finger u to lightly hold the switch shaft at the three successive positions and to give an indication to the operator.

Inasmuch as the play in the gearing is entirely taken up in a part of a rotation of.the motor, the member 11 of the clutch moves but slightly when the switch reaches position II. Thus, if desired, the segments '6" and It could be shorter, and the stroke of the shaft 0 decreased, or the segment I: could be lengthened at the top, whereupon the positions I and II would be combined without the possibility of disengagement between the members of the clutch at the beginningof the initial starting period.

Having thus described .our invention, what we claim is: n p

1. In en ine starting apparatus, the combination with a' starting motor, a source of power supply therefor, gearing including an over-running clutch between the engine and motor, and a brake engageable with the clutch to connect the rotatin members thereof of a controller which rstcauses the brake to e age the clutch and the starting motor to ta *e up the play in the gearing, and then causes the flowof full ower from the source of power supply to t e motor to start the engine from rest.

2. In engine starting apparatus, the combination with a starting motor, a source of power supply therefor, gearin including an Ire engine and motor, and a brake engageable with the clutch to connect the rotating members thereof, of a controller which first causes the "brake to engage the clutch and the starting motor to take up the play in the gearing, and then causes the flow of full power from the source of power supply to the motor While maintaining the brake in engagement with the clutch 3. In engine starting apparatus, the combinetion with a starting motor, a source of power supply therefor. gearing including on over-running clutch between the engine and motor, 3- supplementury ignition system for the engine, ant it broke enga es-hie with the clutch to connect the rotating members thereof, of a controller which first causes the brake to engo-gethe clutch and the starting motor to take up the play in the gearing, an then causes the flow of full full power from the source of power supply to the motor and simultaneously starts the supplementary ignition system into operation.

t. In engine starting apparatus, the coin hination with on electric starting motor, a source of power supply therefor, geering including an ovenrunning clutch between the engine and motor electric connections including a resistance anal on electromagnetically operated brake engegeahle with the clutch to connect the rotating members thereof, of a, multi position switch. which first connects the winding of the electromagnet to the source of power supply to move the brake into engagement with the clutch and then connects the source of power sup ply to the motor through the resistance to take up the play in the gearing, and finally connects the source of power supply directly to the motor to start the engine from rest 5. In engine starting apparatus, the C0311- hinetion with an electric starting motor, a, source of power supply therefor, gearing ineluding en over-running clutch between the engine and motor, electric connections in cluding a resistance, a, supplementary ignition system for the engine, and an electromagnetically operated broke engsgee-hle with the clutch to connect the rotating nieinhers thereof of a multi-position switch which first connects the Winding 015 the elec troinegnet to the source of power supply to move broke into engagement with the clutch and then connects the source of power supply to the motor through the resistance to take up the ploy in the gearing, and fillally connects the source of power supply directly to the motor to start the engine from rest While maintaining the connection to the Winding of the electromegnet and simultaneously connects the source of power supply to the supplementary ignition system. to start it into operation.

in testimony whereof we alfix our sig-= natures.

AUGUElT KAZENMAIER EUGEN BAUER ii ii