Патент USA US2407158код для вставки
sept.3,194s. ~ , BWJQNES l 2,407,158 ENGINE STARTER DRIVE , Filed April 2, 1945 “kvm dat@ _ ’ IN VEN TOR. Byßwyv/¿U @Zones _ A TOBNEY ' Patented sept. 3, 194s 2,407,158 UNITED STATES PATENT oEFlCE;¥ Burr W. Jones, Elmira, N. Y., assig'nor to Bendix Aviation Corporation, South Bend, Ind., a cor poration of Delaware ’ ‘ Application April 2, 1945, Serial N0. 586,199 I aclantis. (o1. vi-n l l . This invention relates to engine starters of the i class in which a starting motor is automatically coupled to an engine member for cranking the engine. 1 ` It is an object of the present invention to pro vide a novel starter for internal combustion en gines which is dimensionally small without sacri ñcing sturdiness and long life. - It is a further object to provide a simple, com pact starter of clean design,`the parts` of which can be manufactured by low-cost machining op- ` erations and be easily assembled. It is a further object to provide such a device . 2 t ing the sleeve ‘and crimped in place as indicated at 9. An anti-frictionv thrust bearing I0 is pref erably interposed between the bushing Ii and the motor frame 3. A thimble II having a smooth cylindrical interior surface I2 is threaded Within the sleeve 4 for longitudinal movement therein toward and away from the bushing 6. A cranking member in the form of a pinion I3 is mounted coaxially with the sleeve 4 for trav ersal into and out of engagement with an engine member such‘as a flywheel gear I4. The end of the pinion is reduced in diameter so as to ñt slidably within the thimble II, and a yielding in which the pinion traversing element is formed driving connection between the thimble and Din as a protective enclosure for the pinion and its ion is provided in the form of a cylindrical block I5 of elastically deformable material such as rub associated parts. ` . ber, fitting loosely within said thimble in abut ting relation tothe pinion. It it is deemed de journalled pinion in axial alignment therewith sirable, the rubber block I5 may be bonded to the and spaced therefrom to permit location of the 20 adjacent surface of the pinion IB. The mounting A further object is to provide such a device em bodying a short motor shaft and a separately yielding member therebetween, thus aiding in ` reducing the overall diameter to the minimum. It is a further object of such a device to pro vide unitary means for assisting in the disen gagement of the starter pinion and preventing the pinion from drifting against the engine member means for the pinion comprises an extension thereof in the form of a stub shaft I'I fixed in tegrally therein in any suitable manner, as by brazing _or Welding, and slidably journalled in 25 a bearing I8 provided in an outboard housing I9 rigidly mounted on the motor frame 3. A spring 20 is seated in a cylindrical recess 2l of the stub shaft I'I bearing at its other end on a fixed clo sure disc 22 to assist in demeshing the pinion and maintaining the pinion in demeshed posi tion. .A disc 23 of non-metallic material, prefer ' to facilitate the traversal oi the pinion member. ably fiber, is set into the bushing 6 of sleeve 4 A further object of such a device is lto provide for the purpose of preventing. noise when the a starter pinion of small size and driving and supporting means for the pinion wherein bending pinion member and .its associated parts are moments are reduced to a minimum. 35 thrown back to idle position,V The longitudinal movement of the pinion into engagement with Further objects and advantages will be appar While in the inoperative position. A further obje’ct is to provide such a device comprising traversing means having a thread of comparatively large diameter and low helix angle ent from the following description taken in con the .engine gear is limited by an anti-friction thrust bearing 24 seated against the housing I9 and slidably receiving the stub shaft I1. Fig. 1 is a side elevation of the device partly in vertical section, the parts being shown in inop 40/ In the operation of this device, rotation of the power shaft I and the sleeve 4 by the starting erative position; motor causes thimble II, by virtue of its inertia, Fig. 2 is a view similar to Fig. 1 showing the to be threaded to the left in Fig. 1, which motion parts in operative position; and is transmitted through the `rubber block I5 to the Fig. 3 is an expanded view in perspective of the pinion I3, causing it to move into mesh with pinion and the actuating means therefor. engine member until stopped by the thrust bear In Fig. 1 of the drawing, there is illustrated a ing 24. Further movement of the thimble causes power shaft I, journalled in a bearing 2 in the the elastic block I5 to be placed under compres frame 3 of a starting motor. A traversing and sion and thereby expands it‘ radially into frie power transmitting member in the form of a nection with the accompanying drawing in which: sleeve, and a pin ‘I passing diametrically through the sleeve, bushing and shaft. The pin is retained tional Contact with the inner surface I2 of the thimble. When the rotation of the thimble is thus arrested, it is compelled to rotate with the sleeve 4, which rotation is transmitted through the rubber block I5 to the pinion member I 3. In by any suitable means such as a ring 8 surround asmuch as the stub shaft I'I is solidly anixed to sleeve 4, interiorly threaded as shown at 5, is , ñxedly mounted on the end of the power shaft by means of a bushing 6 ñxed in the end of the 2,407,158 3 4 the pinion and the pinion is forcibly pressed ing member by unthreading movement thereof, against the thrust bearing 24 when power is ap plied to crank the engine, it is obvious that the pinion will be very rigidly supported in its bearing i8. During the traversal of the pinion into full 5 one of said screw-threaded members being formed as a housing for the cranking member when in idle position, and a yielding driving con nection between the other of said threaded mem bers and the cranking member. mesh with engine gear Ill, the combination anti drift and demeshing spring 20 is compressed and is held in the compressed position until the en 5. In a starter drive for internal combustion engines, a motor shaft, a housing member ñxed thereon, an outboard-mounted pinion for crank gine starts. When the engine ñres, the accel eration of the engine gear causes the pinion and: 10 ing engagement with a member of an engine to be started and located substantialh7 within said its associated parts tooverrun the sleeve 4, where; housing member when in idle position, a block by the thimble l I is threaded back to idle position of elastic material contacting said pinion, and a with the assistance of the spring 20 which de meshes the pinion and holds it in- demeshed posi-_ tion. - As shown in Fig. l, the sleeve 4 encloses the movable parts oi' the drive sor as to preventU foreign matter such as dust, dirt and grease from` n <member substantially enclosing said block and having means cooperating with the housing member for traversing the pinion into engage ment with the engine member. 6. In an engine starter, a bearing, a cranking *member having an extended bearing portion l1 for mounting the pinion I3 is solid with the 20 slidably journalled therein and adapted to en fouling the Working parts. Since the stub shaftf - pinion, no interior bearing is necessary which permits an absolute minimum root diameter of the pinion teeth. This feature improves the gage and crank an engine member, a power shaft, means for actuating the cranking member from the power shaft including an elastically deform able member adjacent said cranking member, an “leverage” of the starting motor on the engine. It will be seen that there is here provided a 25 exteriorly threaded thimble enclosing said elastic member, and a housing member ñxed to the sturdy and simple engine starter drive which is power shaft vand having a threaded engagement compact and easily assembled, small in size and of low helix angle with said thimble for traversal sure in its operation. Although but one em of said cranking member toward said bearing bodiment of the invention has been shown and described in detail, it will be understood that 30 upon acceleration of the power shaft. 7. _An engine starter drive comprising a pinion other embodiments are possible and the parts member journalled by an extended portion there may be rearranged or altered in proportion with of in an outboard bearing t0 mesh and demesh out departing from the spirit of the invention as with a member of the engine to be started, said disclosed in the appended claims. What is claimed is: 35 pinion extension having a recess, a spring hav ing one end seated in said recess and maintained l. In an engine starter drive, a power shaft, a under initial compression, tending to demesh the sleeve extension fixed thereon, a thimble threaded pinion, a motor shaft and a housing sleeve ñxedly in the sleeve, a block of elastically deformable mounted thereon, means including a thimble material in the thimble, a pinion normally housed within the sleeve and engaging said block, a bear 40 within the sleeve having an inclined connection therewith, and cushioning means in the thimble ing in which the pinion is slidably journalled for, adapted to engage and transmit the longitudinal movement by said thimble out of said sleeve into movement of the thimble to the pinion to mesh mesh with a gear of an engine to be started, and the .pinion upon acceleration of the motor shaft. means for limiting the yprojection of the pinion 8. .An engine starter drive including an inboard from the sleeve. ’ andan outboard bearing, a power shaft jour 2. An engine starter drive as set forth in claim nalled in said inboard bearing, a hollow sleeve 1 in which the compression of the block, due to open at one end and provided with threads of the screw-jack action of the sleeve and thimble, low helix angle on its interior surface, said sleeve expands the block into frictional engagement being ñxed t0 said power shaft, a pinion mem with the interior of the thimble, and. further in ber journalled in said outboard bearing having cluding yielding means for returning the pinion an axial recess, a closure of the outboard bear ing, and a helical spring seated at one end in said recess and bearing at its other end against 3. In_ an engine starter, a power shaft, a pinion adapted to be driven thereby mounted for move 55 the closure, a block of elastic material attached to said pinion member, and a thimble in fric ment away from the shaft to engage and crank tional engagement with said block, threaded a member of an engine to be started, and means within said hollow sleeve. for actuating the pinion from the shaft includ 9. An engine starter _drive characterized by an ing a pair of threaded sleeves. one of which is inboard and an outboard bearing, said bearings connected to rotate with the shaft and encloses 60 to idleA position within the sleeve when the pinion overruns the power shaft. said pinion when in idle position, and torque cushioning means for said pinion in the form of a yielding driving connection between the other of said threaded sleeves and thev pinion. 4. An engine starter drive for internal com being. adapted to carry axial and radial thrust, a power shaft journalled in said inboard bearing, a pinion member slidably journalled in said out board bearing and means actuated by the power 65 shaft including concentric sleeves having an in bustion engines including a cranking member clined connection therebetween and an elastic adapted to engage and crank a member of an engine to be started, a motor shaft, means actu Said outboard bearing _and subsequently com block forinitially thrusting said pinion against pressing said elastic block to apply driving torque ated thereby including a pair-of interthreaded ‘ members for causing engagement of Isaid crank 70. to the pinion. BURR W. JONES.