US2337559A - Engine starter drive - Google Patents
Engine starter drive Download PDFInfo
- Publication number
- US2337559A US2337559A US450963A US45096342A US2337559A US 2337559 A US2337559 A US 2337559A US 450963 A US450963 A US 450963A US 45096342 A US45096342 A US 45096342A US 2337559 A US2337559 A US 2337559A
- Authority
- US
- United States
- Prior art keywords
- pinion
- nut
- engine
- screw shaft
- starter drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
- F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
- F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
- F02N15/06—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement
- F02N15/062—Starter drives
- F02N15/063—Starter drives with resilient shock absorbers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/13—Machine starters
- Y10T74/131—Automatic
- Y10T74/133—Holders
Definitions
- the present invention relates to an engine starter drive and more particularly to that type of drive which maintains the gear connection between the starting motor and engine until the engine is reliably self-operative.
- Fig. l is a side elevation partly broken away and in section of a preferred embodiment of the invention.
- Fig. 2 is a detail in side elevation and partly in section of the drive pinion and associated parts in cranking position
- Fig. 3 is a view similar to Fig. 2 showing the parts in the positions assumed durin overrunning of the pinion while held in cranking position.
- a power shaft I and a screw shaft 2 yieldably connected to rotate therewith by means of a drive spring 3 anchored to the power shaft at 4 and to the screw shaft at 5.
- a nut 6 is threaded on the screw shaft 2, and a pinion I is journalled on the nut in position to be carried thereby into and out of engagement with a gear 8 of an engine to be started.
- An abutment 9 on the screw shaft is adapted to be engaged by the end of the pinion 1 when in cranking position, and a flange II is formed on the nut for engaging the opposite end of the pinion and clamping it to the abutment by the screw jack action of the screw shaft and nut.
- Clutch teeth l2 and I3 are preferably provided on the pinion I and flange H' to form a positive driving connection therebetween during the cranking operation.
- centrifugal means are provided for preventing the nut 6 from returning to idle position while the screw shaft is rotating above a predetermined speed
- a spring [6 on the screw shaft is arranged to bear at one end against the abutment member 9 and at its other end against a thrust ring l'l within the bore of the pinion 1 whereby said spring holds the clutch teeth l2, [3 in initial engagement, and prevents the pinion from drifting away from idle position.
- said nut and pinion being formed as clutch 10 means which are closed by the longitudinal pressure of the nut on the pinion when the pinion engages said stop, and means preventing the nut from returning to idle position while the screw shaft is rotating above a predetermined speed.
- a nut having a radial flange formed with clutch teeth threaded on the shaft, a pinion slidably journalled on the nut having teeth adapted to cooperate with said clutch teeth, an abutment on the shaft defining the operative position of the pinion, and a centrifugal latch preventing return of the nut to idle position while the shaft rotates above a predetermined speed.
- a starter drive as set forth in claim 2 in cluding, further, spring means normally maintaining the pinion in idle position and holding the clutch teeth on the nut and pinion in engagement.
Description
Dec. 28, 1943. n. P. KEARNEY ENGINE STARTER DRIVE Filed July 15. 1942 I INVENTOR. Mimi 'oflalu'e Patented Dec. 28, 1943 U NITED ESTATES PATENT FEEQE T 2,337,559 :ENGINE'STARTERaDRIVE Daniel P. Kearney"; Birmingham,TMich.,- assignor to Bendix Aviation Corporation, South Bend, 11111., a corporation of Delaware Application July 15, 1942, Serial No. 450,963
3 Claims.
The present invention relates to an engine starter drive and more particularly to that type of drive which maintains the gear connection between the starting motor and engine until the engine is reliably self-operative.
It is an object of the present invention to provide a novel starter drive of this type which is reliable and efficient in operation and simple and economical in construction.
It is another object to provide such a device which is particularly well adapted for heavy duty installations.
It is another object to provide such a device which includes an overrunning clutch connection to the pinion.
It is a further object to provide such a device incorporating a unitary means for preventing the pinion from drifting away from its idle position and for holding the clutch in initial engagement.
Further objects and advantages will be apparent from the following description taken in connection with the accompanying drawing in which:
Fig. l is a side elevation partly broken away and in section of a preferred embodiment of the invention.
Fig. 2 is a detail in side elevation and partly in section of the drive pinion and associated parts in cranking position, and
Fig. 3 is a view similar to Fig. 2 showing the parts in the positions assumed durin overrunning of the pinion while held in cranking position.
In Fig. l of the drawing there is illustrated a power shaft I and a screw shaft 2 yieldably connected to rotate therewith by means of a drive spring 3 anchored to the power shaft at 4 and to the screw shaft at 5.
A nut 6 is threaded on the screw shaft 2, and a pinion I is journalled on the nut in position to be carried thereby into and out of engagement with a gear 8 of an engine to be started. An abutment 9 on the screw shaft is adapted to be engaged by the end of the pinion 1 when in cranking position, and a flange II is formed on the nut for engaging the opposite end of the pinion and clamping it to the abutment by the screw jack action of the screw shaft and nut. Clutch teeth l2 and I3 are preferably provided on the pinion I and flange H' to form a positive driving connection therebetween during the cranking operation.
According to the present invention centrifugal means are provided for preventing the nut 6 from returning to idle position while the screw shaft is rotating above a predetermined speed,
the screw shaft and normally maintained by a spring H3 in a retracted position as shown in Fig. 2 where it does not interfere with the travel of the nut on the screw shaft. Rotation of the screw shaft above a predetermined speed during 10 the cranking operation causes the latch to move out by centrifugal force to the position shown in Fig. 3 where it limits the return movement of the nut to an amount sufficient to release the pinion from its clutching engagement.
A spring [6 on the screw shaft is arranged to bear at one end against the abutment member 9 and at its other end against a thrust ring l'l within the bore of the pinion 1 whereby said spring holds the clutch teeth l2, [3 in initial engagement, and prevents the pinion from drifting away from idle position.
In operation, starting with the parts in the positions illustrated in Fig. 1, rotation of the power shaft l by the starting motor not illustrated is transmitted through the spring 3 to the screw shaft 2, whereby the nut 6 and its associated parts are caused to traverse to the right until the pinion 1 meshes with the engine gear 8 and engages the abutment 9. The pinion is then clutched positively to the screw shaft by the nut and is caused to rotate therewith to crank the engine.
When the engine starts, the acceleration of the engine gear 8 causes the pinion 'i to overrun the drive, thus threading the nut 6 back along the screw shaft until it engages the latch M as shown in Fig. 3. The clutch I2, 13 is thus opened permitting the pinion to overrun freely. If the engine should then fail to continue self-operative, cranking will be resumed as soon as the starting motor accelerates to a speed corresponding to the engine rotation. When the engine is reliably self-operative, deenergization of the starting motor by the operator permits the screw shaft to decelerate until the spring 15 withdraws the latch l4 whereupon the parts are returned to idle position.
Although but one embodiment of the invention 5 has been shown and described in detail, it will be understood that other embodiments are possible and that various changes may be made in the design and arrangement of the parts without departing from the spirit of the invention as defined in the claims appended hereto.
said nut and pinion being formed as clutch 10 means which are closed by the longitudinal pressure of the nut on the pinion when the pinion engages said stop, and means preventing the nut from returning to idle position while the screw shaft is rotating above a predetermined speed. 15
2. In an engine starter drive a shaft, a nut having a radial flange formed with clutch teeth threaded on the shaft, a pinion slidably journalled on the nut having teeth adapted to cooperate with said clutch teeth, an abutment on the shaft defining the operative position of the pinion, and a centrifugal latch preventing return of the nut to idle position while the shaft rotates above a predetermined speed.
3. A starter drive as set forth in claim 2 in cluding, further, spring means normally maintaining the pinion in idle position and holding the clutch teeth on the nut and pinion in engagement.
DANIEL P. KEARNEY.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US450963A US2337559A (en) | 1942-07-15 | 1942-07-15 | Engine starter drive |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US450963A US2337559A (en) | 1942-07-15 | 1942-07-15 | Engine starter drive |
Publications (1)
Publication Number | Publication Date |
---|---|
US2337559A true US2337559A (en) | 1943-12-28 |
Family
ID=23790233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US450963A Expired - Lifetime US2337559A (en) | 1942-07-15 | 1942-07-15 | Engine starter drive |
Country Status (1)
Country | Link |
---|---|
US (1) | US2337559A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2446458A (en) * | 1945-10-29 | 1948-08-03 | Bendix Aviat Corp | Engine starter |
-
1942
- 1942-07-15 US US450963A patent/US2337559A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2446458A (en) * | 1945-10-29 | 1948-08-03 | Bendix Aviat Corp | Engine starter |
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