Патент USA US2117230код для вставки
May 10, 1938. H. A. THORNBURG ET AL 2,117,230 ENGINE STARTING` .Í‘QPPARÀTUSl Filed July e, 1936 2 Sheets-Sheet l May ÍÜ» 1938- v H. A. THORNBURG ET AL 2,117,230 ENGINE STARTING APPARATUS Filed July 8, 1956 34( _ 2 Sheets-Sheet 2 /ZO ZZ 39 26a: /28 Patented May 10, 1938 2,117,230 UNITED STATES PATENT OFFICE 2,117,230 ` ENGINE STARTING APPARATUS Herbal A. Thornburg and James V. Brown, An derson, Ind., assignors to General Motors Cor poration, Detroit, Mich., a corporation of Del aware Application July 8, 1936, Serial No. 89,503 5 Claims. This invention relates to apparatus for starting an internal combustion engine and particularly to the type of apparatus which comprises an elec tric motor and a pinion driven by motor and mov able axially into mesh with the fly-wheel or other gear of the engine to be started. In this type of apparatus the pinion is withdrawn from the fly wheel gear after the engine has been started. It is one of the objects of the present invention ' to prevent engaging the motor-driven pinion with the engine gear in case the engine is running prior to moving the pinion into engagement there with. In the disclosed embodiment of this invention the present object is accomplished by providing a part adapted to make substantially noiseless contact with an end face of an engine flywheel and to be moved in response to contact with the moving ñywheel into such position as to positively 20 stop movement of the motor pinion into engage ment with the flywheel gear. ‘The present invention is adapted for any sort of motor vehicle propelled by an internal combus tion engine and is particularly useful on pas senger busses of the type where the engine is lo cated on the side or at the rear of the vehicle and (Cl. 123-179) tional View being taken on the line 1_1 of Fig ure 6. Referring now to Figure 1, numeral 29 desig nates the electric motor comprising afield wind ing 2 I , an armature 22 and brushes 23 and 24, the 5 latter of which is grounded at 25. This motor drives the shaft 26 which is supported by bear ings carried by the frame of the motor. The left end frame is not shown, but it will be understood to be attached to the left-hand end of the field 10 frame 21 which carries the field winding 2|. The right end frame or gear housing of the motor is designated by numeral 28, and it carries a bear ing 29 for the right-hand end of the shaft 26. ` The shaft 26 is provided with longitudinal splines l 3U which cooperate with longitudinal splines 3l provided in the sleeve 32 of the inner member or clutch cam 33 of an overrunning clutch.` This clutch comprises also a driven member or shell 34 and a series of rollers 35 eachl of which is located 20 between the inner cylindrical surfaces of shell 34 and a cam surface 33a which is not concentric with the shell. The surfaces 33d are so arranged with respect to the shell 34 that, as the clutch inner member 33 rotates clockwise as viewed by the arrow 36 in Figure '7, clockwise rotation will so far from the driver’s seat that the operation of be imparted to the shell 34. Obviously the shell the engine when idling is not audibly perceptible. 34 may overrun in a clockwise direction with re It occasionally happens that the operator, believ spect to the inner driving member 33 when one 30 ing that the engine _has stopped, whereas in fact Views it as shown in Figure '7. The clutch inner it is idling, will operate the starter control button ' member 33 carries a bearing bushing 31 which is causing the starter pinion to mesh with the fly journaled on the reduced end portion 26a. of the wheel gear. The engagement of the starter pin shaft 26. The portion 26a, supportsa bearing ion with the flywheel gear while the engine is bushing 38 press-fitted into the hub of a starting running produces a disagreeable noise and is motor pinion 39 which is adapted to move axially damaging to the gear teeth. Such noise or darn along the shaft portion 26a into mesh with the age is avoided by the use of the present invention. iiywheel gear 40 of the engine to be started. The Further objects and advantages of the present pinion 39 is drivingly connected with the shell 34 invention will be apparent from the following de by providing the latter with an annular boss 4| scription, reference being had to the accompany into which are provided a series of depressions, 40 ing drawings wherein a preferred embodiment of each adapted to receive an end portion of a tooth the present invention is clearly shown. of the pinion 39 when the pinion is fixed to the In the drawings: shell 34, as shown in Figure 1. To secure the Figure 1 is in part a longitudinal sectional View pinion 39 to the shell 34 the pinion is provided of the starting apparatus embodying the present with an annular flange 42 which is passed through 45 invention and in part a wirin-g diagram; a central orifice in the shell 34 and is riveted Figures 2 and 3 are sectional Views taken re spectively on the lines 2--2 and 3-3 of Figure 1; Figures 4, 5, and 6 are fragmentary side views partly in section of the engine starter drive, show ing the same in various positions; and Figure 7 is in part an end View of the pinion and clutch assembly and in part a sectional view of the clutch, the end view being taken in the ,A direction of the arrow A1ct of Figure 6, the sec over against the shell 34, as indicated at 43. ` This overrunning clutch and pinion assembly is moved along the shaft 26 by means of a pinion meshing means including shifter sleeve 50 pro 50 vided with an annular groove 5| for receiving pins or studs 52 located on diametrically opposite sides of the sleeve 50 and carried by spaced arms 53 of al lever 54 pivoted upon a rod 55 carried by the frame 28. The rod 55 is surrounded by a coil 55 2 2,117,230 spring 56, one end 51 of which bears downwardly against the frame 28, as indicated by the arrow 51a and the other end 58 of which bears in the direction of the arrow 59 against a pin 58 car ried by the lever 54. Counterclockwise rotation of the lever 54 causes the sleeve 58 to move toward the right, as shown in Figure 1. The sleeve 58 has a central bore 6| which has a sliding ñt with the shaft 26 and has a part 62 provided with a central 10 bore E3 having a sliding iit with respect to the sleeve 32. Between the right-hand end of part 52 and the left-hand end of a washer 64 sur rounding the sleeve 32 and bearing against the clutch cam 33, there is located a coil spring 65 which normally is somewhat compressed. Spring 65, therefore, forces the part 62 a deñnite distance an elongated slot |84 through which passes a pin |85 connecting the link |83 with the lever 54. The two windings 18 and 1| are connected with the battery 80 by push-button switch | |8. To start the engine, the operator closes the switch ||8 thereby causing the current to flow from the battery through the switch and through the windings 10 and 1| and back to the ground connection 18a. Current will also flow from the battery through the switch | I8, winding 1|, start ing motor 20, and back to the battery through the ground connections 25 and 8|. The electromag net will be energized suñiciently to cause the armature 13 to move toward the left in order to cause that counterclockwise rotation of the lever separation of the parts 62 from the parts 64 is limited by a wire split ring 66 which is snapped 54 and that axial movement of sleeve 58 which will move the motor pinion 39 into mesh with the engine gear 48. During this movement of the armature 13, it will engage the rod 81 to cause it 20 into a groove provided by the sleeve 32 and which to move toward the left and the contact 84 to be bears against a beveled surface 81 provided on the left-hand end of the part 62. The part 62 is joined with the main part of the sleeve 58 by an arcuate web 68 shown best in Figure 2. This web 25 68 is spaced from the shaft 26 suiiiciently to per engaged with the contacts 83 and 85 under yield ing pressure afforded by the spring 89. When away from the washer 64 and clutch cam 33. The this occurs the motor will receive current from the battery and the shaft 26 will rotate and the pinion 39 will drive the engine gear 48 in such mit assembling the split ring 66. Quite obviously, direction as to cause the engine to be started. motion of the sleeve toward the right as eiîected by counterclockwise rotation of the lever 54 will cause the motion to be imparted through the After the engine has been started the operator releases the push-button switch | I8 thereby caus ing the electromagnet to be deenergized, where upon the lever 54 is moved clockwise into its 30 original position due tol the action of the spring 56, and the pinion 39l is withdrawn from the en gine gear 48. The armature 13 having been with drawn from the rod 81, the spring 92 moves the rod 81 back to its normal position thereby dis engaging the contact 84 from the contacts 83 and 85, whereupon the motor 28 is disconnected from the battery 88 and the motor stops. When the contact 84 engages the contacts 83 spring 65 to the clutch and pinion assembly there by causing the pinion 39 to move into engage ment with the engine gear 48. The lever 54 is moved in a counterclockwise di rection by direct manual operation or by the 35 electromagnetic means shown diagrammatically in Figure 1. 'I'his electromagnetic means com 30 prises an electromagnet having two windings 18 of relatively fine wire and 1| of relatively coarse wire. These windings surround a non-magnetic 40 tube 12 which provides a guide for the movement of a magnetizable armature 13 toward a sta tionary magnetizable core member 14 also located within the magnetic field which is created by cur rent passing through these windings. The core 14 is attached to the magnetizable discs 15 which are in contact with a magnetizable shell 16 and in contact also with m'agnetizable discs 11 and 18 which are h'eld by the sleeve 12 concentric with respect to the armature 13. and 85 the winding 1| of coarse wire will be ¿_ short circuited so that a greater amount of current will flow from the battery to the starting motor than before. At the time contact 84 engages with contacts 83 and 85 to short circuit the winding 1| the air gap between the core 14 and armature 13 45 is relatively small and, therefore, the magnetic force produced by the coil 18 alone is sufficient to hold the armature 13 in its attracted position. Should the pinion 33 collide with the end faces The starting motor 28 is energized by current of the teeth of the flywheel gear 48 before go from a storage battery 88 which is grounded at ' ing into mesh, motion of the armature 13 will not cease due to the fact there is yielding connection 8| and which is connected by wire 82 with a start er switch contact 83. Contact 83 is connected aiîorded by the spring 85 between the sleeve 58 and the pinion and clutch assembly. After the by a movable Contact 84 with a stationary con tact 85 which is connected with winding 1| and pinion 39 engages the end faces of the teeth of 55 with the series field 2| of the starting motor. The the flywheel gear 48, the armature 13 will con contact 84 is insulatingly supported by a tubular tinue to move toward the left and the sleeve 58 toward the right. While the spring 65 is being metallic rivet 88 which is slidable upon a rod 81 which extends through the core 14 and is guided compressed beyond its initial stage of compres 60 thereby. The rod 81 carries a washer 88 against sion, the switch contact is being engaged with 60 which the tubular rivet 86 is urged by spring 89 the contacts 83 and 85. When this engagement located between a washer 98 ñxed to the rod 81 occurs, the motor will be connected with the bat and a washer 9| loosely mounted on the rod 86. tery and will cause the pinion teeth to be brought The washer 98 is held against the left end face of into mesh registration with the spaces between the teeth of the engine gear 48. At the instant 65 core 14 by a spring 92 which surrounds a stud 93 carried by a fixed part 94 and projects into an meshing registration occurs, the spring 65 will be released quickly to move or “jump” the pinion 39 axial. bore 94 in the pin 81. The spring 92, there into mesh with the engine gear 48. fore, serves to maintain the contact 84 out of en Should the pinion 39 fail to come out of mesh gagement with contacts 83 and 85, and the right 70 >hand end of plunger 81 in such position as to be with the engine gear 48 after the engine starts, normally engaged by the left-hand end of core the spring 92 is still free to move the contact 84 away from the contacts 83 and 85 due to the fact 13. The winding 18 is grounded at 18. ‘ The armature 13 is centrally tapped to receive that the slots |84 in links |83 provide thelost the threaded shank |88 of a stud |8| which is motion connection between the lever 54 and the ` 75 75 >connected by cross pin |82 with a .link |03 having armature 13. 3 2,117,230 The means for preventing the meshing of the motor pinion with the engine gear after the engine becomes self-operative and the pinion has been demeshed therefrom, will now be described with particular reference to Figures 1, 4, 5, and 6. This means comprises a tubular cup-shaped part |20 having a tubular sleeve |2I/»journaled on the part 62 of the sleeve 59 of the pinion meshing -means, and having an annular flange |22 adapted 10 to engage the left end face of the flywheel |23 which carries the gear 40. The part 62 carries diametrically opposed screw pins |24, each of which is received by a somewhat T-shaped slot |25 provided in the tubular sleeve | 2| of the tubu 15 lar part |29. The head of this T-shaped slot |25 is a somewhat triangular opening deñned by wall ited` to a' position wherein the pinion 39 is still out of engagement with the left end faces‘of the gear teeth of the flywheel gear 40, as shown in Figure 6. In this way motion of the pinion into engagement with the engine ilywheel gear is positively arrested when the operator attempts to mesh these gears While the engine is running. Upon release of the operating lever 54 the spring 5E restores it and the other parts of the pinion meshing means to normal position shown 10 in Figure l. During this return movement, the end ñange |22 of the tubular part |29 leaves the portions |25 which are oblique or inclined to the axis of the pinion. The stem or elongated por« tion of the slot is indicated by numeral |21, and 20 is of a length such that the pinion may be meshed with the engine gear while part |20 is pressed against an end face of the engine gear, provided that the pin i2@ remains in alignment with the elongated slot portion |21. Where the stem or pressure exerted by the spring |30. 25 elongated portion |21 joins the head portion de fined by oblique wall portions |29, the metal of sleeve |2| provides stop shoulders |28 each of which is adapted to receive pin |24 depending on which direction the sleeve |20 is rotated with respect to the sleeve `59. Normally each pin |24 rests in the apex of the head portion of the slot |25 and between the oblique wall portions |26, and is caused to be moved into that position by spring |30 located between a shoulder |3| of the sleeve 59 and a washer |32 surrounding the sleeve 59 and bear ing against the left end of the sleeve | 2 |. There fore, while the engine is at rest, the pinion 39 may be meshed with the engine gear 40 without 40 hindrance by the cup-shaped member |20 since, during this meshing movement, the pin |24 will move into the stem portion |21 of the slot | 25 and finally into the position shown in Figure 5, when the pinion 39 is fully meshed with the 45 engine gear 40. During the cranking of the engine the flange |22 of the cup~shaped mem~ ber |20 will bear against the left face of the end face of the engine gear | 23 and each slot part |21 returns to alignment with each pin |24 due to the camming action between each pin |24 15 and each inclined wall surface |26 caused by ` While the embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be 20 adopted, all coming within the scope of the claims which follow. What is claimed is as follows: 1. Engine starting apparatus comprising, in combination, an electric motor, a pinion driven 25 by the motor and slidab-le axially into mesh with a gear of the engine to be started, means to move the pinion into mesh with the engine gear, and means responsive to rotation of the engine gear for positively> blocking movement of the 30 pinion into mesh with the engine gear while- the engine is running, said last mentioned means comprising a locking sleeve adapted to be rotated by the engine gear into locking position to pre vent movement of the pinion toward the engine 35 gear. 2. Engine starting apparatus comprising, in combination, an electric motor, a pinion driven by the motor and slidable axially into mesh with a gear of the engine to be started, means to move 4.0 the pinion into mesh with the engine gear, a part movable against an end face of the engine gear and adapted to be rotated thereby, means for transmitting movement from the pinion meshing means to said part to cause the latter 45 to be pressed against an end face of the engine gear before the pinion starts to mesh with the engine flywheel |23, but such engagement will be practically noiseless. If the operator attempts to mesh the motor engine gear, and devices for interconnecting the pinion meshing means and said part, said devices being so constructed and arranged as normally 50 pinion 39 with the engine gear 40 while the en to permit such a relative movement between the pinion and part that the pinion may be meshed with the engine gear while the part is pressed against the engine gear and to prevent said rela tive movement in case the engine gear is rotating 55 before the pinion is meshed therewith` gine is running the tubular, cup-shaped part |28 will be rotated due to the frictional engagement of the end face of the ñywheel |23 and flange |22 of the part |20 thereby causing the slots |25 in the sleeve | 2| to be shifted relative to the pins |24 carried by the sleeve y5|), one way or the other depending on the direction of the rotation of the cup-shaped member |29. Figure 6 shows the condition which will obtain if, looking in the direction of the arrow 'la in Figure 6, the rota tion of the ñywheel |23 is counterclockwise. Quite obviously, the rotation of the tubular, cup shaped part |29 will be clockwise. Therefore, the slot |25 nearest the observer of the view shown in Figure 4 will move upwardly into the position shown in Figure 6, and the lowermost portion of the two shoulders |28 provided by the metal of the sleeve |2| adjacent the slot |25 will provide a stop for the pin |24. Since the pin |24 can move no further toward the right than is shown in Figure 6, the shifter sleeve 5U and the clutch and pinion assembly can be moved no further toward the right. The clutch and pin 75 assembly is arrested in its movement and is lim 3. Engine starting apparatus comprising, in combination an electric motor, a pinion driven by the motor and slidable axially into mesh with a gear of the engine to be started, means to move 60 the pinion into mesh with the engine gear, a tubu lar part surrounding the pinion and pinion mesh ing means and movable against an end face of the engine gear to be rotated thereby, means for transmitting motion from the pinion meshing means to said port to cause the latter to be pressed against an end face of the engine gear before the pinion starts to mesh with the engine gear, and devices for interconnecting the pinion meshing means and said part and provided respectively by said means and part, one of said devices being a laterally extending pin and the other a mem ber having a slot for receiving the pin, said slot having an elongated portion extending longitudi nally of the axis of the pinion whereby normally 75 4 2,117,230 pin to alignment with the elongated portion of to permit such a relative movement between the pinion and tubular part that the pinion may be meshed with the engine gear while the part is the slot when the pinion meshing means returns to normal position. pressed against the engine gear, said slot provid ing a stop shoulder which is moved into align combination, an electric motor, a pinion driven ment with the pin in case the tubular part is rotated by the engine gear face prior to the meshing of the pinion With the engine gear. 4. Engine starting apparatus comprising, in 10 combination, an electric motor, a pinion driven by the motor and slidable axially into mesh with a gear of the engine to be started, means to move the pinion into mesh With the engine gear, a tubu lar part surrounding the pinion and pinion mesh 5. Engine starting apparatus comprising, in by the motor and slidable axially into mesh with` a gear of the engine to be started, means to move the pinion into mesh with the engine gear, tubu lar part surrounding the pinion and pinion mesh ing means and movable axially against an end face 10 of the engine gear to be rotated thereby, a slot provided by the tubular part including an elon gated portion extending longitudinally of the axis of the pinion a pin extending laterally from the pinion meshing means and into said slot, a spring 15 for transmitting motions from the pinion meshing 15 ing means and movable against an end face of the engine gear to be rotated thereby, yielding means for transmitting motion from the pinion meshing means to said part to cause the latter means to the tubular part thereby causing one to be pressed against an cnd face of the engine normally against said pin whereby normally to 20 gear before the pinion starts to mesh with the maintain an end of the tubular part closer to the engine gear than the pinion, said elongated slot engine gear, and devices for interconnecting the pinion meshing means and said part and provided 'respectively by said means and part, one of said devices being a laterally extending pin and the 25 other a member having a slot for receiving the pin, said slot having an elongated portion ex tending longitudinally of the axis of the pinion . whereby normally to permit such a relative move ment between the pinion and tubular part that 30 the pinion may be meshed with the engine gear While the part is pressed against the engine gear, said slot providing a stop shoulder which is moved into alignment with the pin in case the tubular part is rotated by the engine gear face 35 prior to the meshing of the pinion with the engine gear, said slot having a surface oblique to the axis of the pinion whereby said surface and said yielding means may cooperate to restore the end wall of the slot of the tubular part to bear portion permitting the pinion to be meshed with the engine gear while the tubular part is pressed against an end face of the engine gear, said slot providing a stop portion which is moved into align 25 ment with the pin in case the tubular part strikes the engine gear while rotating whereby to prevent contact between the pinion and engine gear while the engine is running, and said slot providing a surface inclined to the axis of the pinion and lo 30 cated between the stop shoulder and an end of said slot, said inclined slot portion cooperating with the pinion under pressure exerted by said spring to restore the alignment between the pin and the elongated portion of said slot when the 85 pinion meshing means returns to normal position. HERBAL A. THORN‘BURG. JAMES- V. BROWN.