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
  • F02N15/067—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 the starter comprising an electro-magnetically actuated lever
• • 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
• • 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
  • F02N11/00—Starting of engines by means of electric motors
• • 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

Definitions

• Launcher for an electric starter comprising an operating ring secured to a pinion.
• an electric starter in particular for an internal combustion engine, comprises a mechanism, called a launcher, comprising a driving pinion (121) driven in rotation by the motor ( 1 10) electric starter, and free in translation relative to the shaft (1 1 1) of said motor (1 10) electric, according to a stroke c.
• This race c separates two positions of the drive pinion:
• start where the pinion (121) drive is meshing with the ring (150) of the starting engine of the internal combustion engine.
• the rotational connection of the driving pinion (121) with the shaft (1 1 1) of the electric motor is achieved by helical splines (not shown).
• the translation of the pinion (121), along the stroke c, is obtained by means of a fork (122), articulated between its two ends in a pivot connection axis (120) perpendicular to the axis of the shaft (1 1 1) of the electric fitter.
• Said fork is bonded to each of its ends according to combined links reproducing a pivot connection having as axis, the axis (120) of articulation of the fork relative to the body.
• the fork (122) is connected to the drive gear (121), and at its other end to a movable rod (131) moved via a solenoid (130) energized over there closing the ignition contact (160).
• the helical connection between the pinion (121) drive and the shaft (1 1 1) of the electric motor causes the rotation of said pinion (121) drive during its translation.
• the travel c of the drive gear is stopped against an axial stop (1 12) on the shaft (1 1 1) of the electric motor.
• a freewheel mechanism (140) and resilient axial linkage means (145) between the fork and the drive pinion facilitate meshing of said pinion with the starter ring (150) of the internal combustion engine.
• the size of the starter is determined, in particular, by the characteristics of the launcher:
• the size of the movable rod displacement device depends on its power, which power is in particular a function of the inertia of the parts whose displacement is necessary to achieve the starting race.
• the size of the displacement device is thus all the more important that the drive pinion is heavy and the fork is long and massive.
• the length of the fork is a function of the distance between the movable rod displacement device and the axis of the electric motor. Thus, this spacing, and therefore the length of the fork, increases with the size of the displacement device.
• launcher designates the assembly consisting of the drive gear, its guidance on the shaft of the electric motor, the fork, the movable rod and the displacement device of said movable rod.
• US Pat. No. 7,859,150 describes embodiments of a starter whose launcher comprises a lightened drive pinion, said pinion being made in two parts: a toothed part, adapted to mesh with the motor crown, made of steel, and a maneuver ring made of plastic material, connected to said part toothed and on which the fork acts, between two shoulders.
• This embodiment makes it possible to lighten the drive pinion but has several drawbacks, in particular:
• the length of the pinion is elongated which, for a given stroke, increases the length of the electric motor shaft, so the starter clutter;
• the plastic ring acts on a thick shoulder of the drive pinion.
• the presence of this shoulder makes complex the realization of the cutting of said pinion and increases the cost;
• the portion of the plastic ring on which the fork is acting is cantilevered and capable of deforming and degrading rapidly under the effect of the action of said fork, both during the free movement of the pinion when in contact with the toothing of the starter ring and especially at the end of the stroke, when in contact with the stop, thus degrading the reliability of the starter;
• the plastic ring is free to rotate relative to the pinion which implies the existence of a clearance between the two, with the risk of jamming or jamming, or the presence of additional parts such a bearing to balls between the ring and the drive pinion, which complicates the assembly and weighs the whole.
• a launcher comprising an operating ring in rotation with the drive sprocket and made of a material lighter than the material constituting the drive sprocket, wherein, the operating ring comprises: a. connecting means comprising an axial connection profile, mounted on a complementary connection profile of the drive pinion a complementary connection profile of the drive pinion;
• maneuvering means capable of making a connection with the launcher fork
• the radial superposition of the connecting means and the operating means makes it possible to considerably reduce the axial size of the operating ring and to increase the rigidity and reliability of the operating means, while reducing the displaced weight of the launcher. . These characteristics thus make it possible to reduce the size of the starter provided with such a launcher.
• the connecting means are elastic and that these means are able to snap by radial deformation on the complementary part of the pinion.
• the use of a snap means allows for a quick manufacturing process.
• the ring is integral in rotation with the pinion.
• the friction is between the ring and the fork and not between the pinion and the ring. This helps prevent premature wear.
• the friction between the material of the pinion and the material of the ring is more important than the friction between the material of the fork and the ring.
• the ring is integral in translation with the pinion. We hear that there is no play when the ring pushes or pulls the pinion. This improves the strength of the ring.
• the maneuver ring consists mainly of a plastic material, thus said ring is obtained economically by injection.
• the connecting means comprise tabs turned over with respect to the internal bore of the operating ring, the fold between said bore and each tongue constituting an elastic hinge for the radial deformation of said connecting means.
• the drive pinion comprises a reinforcement shoulder of the teeth, the internal bore of the operating ring bearing radially on the periphery of said reinforcement.
• said shoulder cooperates with the operating ring to increase the rigidity of the operating profile of said ring.
• the operating means comprise a groove profile between two shoulders, the groove bottom diameter being greater than the tooth crown diameter of the drive pinion.
• the action of the fork over a large diameter avoids any jamming, especially on the helical grooves, during the translation of the drive pinion.
• This feature also simplifies the coupling of the fork with the operating ring, particularly when the lever arm between the coupling and the pivot axis of said fork is of reduced length, and also avoids any interference between the fork and pinion, operating ring or electric motor shaft when performing the race.
• the drive pinion has at its axial end opposite to the operating ring, a guide ring adapted to slide on a smooth portion of the shaft of the electric motor.
• This guide ring makes it possible to center the drive pinion on a smooth part of the drive shaft and thus to avoid any jamming of the drive pinion during its travel, and this even if said drive pinion is of reduced length.
• This feature also makes it possible to simplify the machining of the internal bore of the drive pinion, by allowing, due to the absence of shoulder, the realization of the helical splines by broaching.
• said guide ring comprises a shoulder adapted to come into contact with the limit stop of the shaft of the electric motor.
• said shoulder plays a damping and noise reduction role.
• the guide ring consists mainly of a plastic material.
• said ring is lightweight and is obtained economically including injection techniques.
• the nature of the plastic material is advantageously selected for its friction characteristics.
• the sliding of the drive gear on the shaft of the electric motor is facilitated and the use of a rotary limit stop is not necessary, which helps to reduce the size of the starter.
• the guide ring is force-fitted into the guide bore of the drive pinion. This method of assembly is fast and compatible with a mass production.
• connection means between the fork and the operating ring consist of two diametrically opposite studs penetrating into the groove profile of the connecting means, the distance between the pivot pivot axis of the fork and the center of said pads being greater than the distance between the axis of said pivot connection and the axis of rotation of the electric motor shaft.
• the invention also relates to an electric starter, in particular for an internal combustion engine, which starter comprises a launcher according to this last embodiment.
• the combination of the different characteristics of the launcher thus makes it possible to produce a particularly compact starter with regard to the embodiments of the prior art.
• the stroke c of the drive gear of the starter of the starter object of the invention, between the rest position and the starting position is between 1 and 1, 2 times the length l cut of the toothed portion of said sprocket. 'training.
• the length of the electric motor shaft of the electric starter object of the invention, and on which the drive gear of the launcher moves in translation is between 2 and 2.5 times the stroke c.
• the invention also relates to a launcher comprising a drive sprocket having at an axial end a guide ring (230) adapted to slide on a smooth portion of the shaft (420) of the electric motor of the starter.
• This guide ring makes it possible to center the drive pinion on a smooth part of the drive shaft and thus to avoid any jamming of the drive pinion during its travel, and this even if said drive pinion is of reduced length.
• This feature also makes it possible to simplify the machining of the internal bore of the drive pinion, by allowing, due to the absence of shoulder, the realization of the helical splines by broaching.
• said guide ring comprises a shoulder adapted to come into contact with the limit stop of the shaft of the electric motor.
• said shoulder plays a damping and noise reduction role.
• the guide ring consists mainly of a plastic material.
• said ring is lightweight and is obtained economically including injection techniques.
• the nature of the plastic material is advantageously selected for its friction characteristics.
• the sliding of the drive gear on the shaft of the electric motor is facilitated and the use of a rotary limit stop is not necessary, which helps to reduce the size of the starter.
• the guide ring is force-fitted into the guide bore of the drive pinion. This method of assembly is fast and compatible with a mass production.
• the launcher further comprises the operating ring described above.
• FIGS. 1 to 6 The invention is explained below according to its preferred embodiments, in no way limiting, and with reference to FIGS. 1 to 6 in which:
• FIG. 1 shows in a schematic sectional view and profile, an embodiment of an electric starter comprising a launcher
• FIG. 2 is a perspective view in partial longitudinal section and exploded of a drive gear according to one embodiment of the launcher object of the invention
• Figure 3 shows the assembly of Figure 2 in a longitudinal sectional profile view
• FIG. 4 is a partial sectional view of an example of an electric starter comprising a launcher according to an exemplary embodiment of the invention, FIG. 4A in the so-called rest configuration and FIG. 4B in the so-called start-up position;
• said pinion consists of an assembly of a portion 221 toothed formed, for example steel, and two annular rings 230, 240, made of a material consisting predominantly of a plastic, said rings 230, 240 being clip on said toothed portion 221.
• these rings 230, 240 consist of a composite comprising a filler of glass or carbon in a polymer matrix of polyacetal type, also known under the trade name of Delrin®. This material has both good impact resistance and good friction characteristics.
• the toothed portion 221 is preferably obtained by forging according to a so-called "net shape" method making it possible to obtain the external toothing in finished dimension, and comprises a shoulder 224 for reinforcing the teeth.
• the external toothing is obtained by cutting the mother burr, in this case, the outer toothing does not include such a shoulder reinforcement, to reduce the manufacturing cost, this embodiment remaining compatible with the invention.
• the bore of the toothed portion 221 comprises helical grooves 225, adapted to cooperate with complementary splines of the electric motor shaft of the starter (not shown) on which is mounted this pinion 220 drive.
• Said grooves 225 are advantageously made by broaching.
• the ring 230 at the axial end, referred to as the front end, of the drive pinion 220, is fitted into a bore 226 made in the toothed portion 221, the diameter of said bore 226 being greater than the diameter at the bottom of the groove of this same toothed portion.
• Said ring 230 is a guide ring whose bore 231 carries out the centering of the driving pinion 220 on the electric motor shaft of the starter (not shown).
• annular ring 230 on the front end of the toothed part, allows the realization of the grooves 225 by broaching, while ensuring the guiding function.
• the annular ring 240 assembled on the rear axial end of the toothed portion, is a so-called maneuver ring. Said operating ring is, according to this embodiment, clipped on the toothed portion 221 by means of tongues 241 resilient in rotation with respect to the bore of this annular ring.
• the tabs 241 comprise a locking profile 340, here female, adapted to cooperate with a complementary profile, here male, made at the end of the portion 221 toothed.
• Folding 341 reversing tabs 241 with respect to the bore of the annular operating ring 240 acts as an elastic hinge so that by thrusting the actuating ring 240 onto the toothed portion 221, said tabs 241 deviate and snap on the rear end of said toothed portion.
• the fold 341 is positioned at the rear of the operating ring in the direction of insertion of said ring on the end of the toothed portion.
• the fold is made in front of the operating ring in the insertion direction thereof on the end of the toothed portion.
• Said operating ring 240 comprises a maneuvering profile 345 comprising two cheeks 346 separated by a groove.
• the bottom diameter of said groove is greater than the outer diameter of the teeth of the toothed portion.
• the internal bore of the operating ring is supported on the periphery of the shoulder 224 for reinforcing the teeth of the toothed portion. This arrangement makes it possible to stiffen the form 345 of maneuver on the one hand and on the other hand secures the clipping of the operating ring on the end of the toothed part.
• the guide ring 230 comprises a shoulder forming an axial stop 330 at the front end of the drive pinion 220.
• a starter 400 according to an exemplary embodiment of a starter 400 according to the invention, the latter comprises a fork 440 articulated along a pivot axis 450 relative to said starter, said fork 440 being connected to one of its end to the 240 for driving the drive pinion 220 and at its other end to a movable rod 461, the displacement in translation of said movable rod 461 being controlled by a solenoid 460.
• the fork 440 acts on the ring 240 to maneuver in the form operating said ring.
• This ring being of large diameter relative to the toothed part of the drive pinion, this arrangement allows a large angular displacement of the fork during the displacement of the movable rod to achieve the start stroke c, without risk of interference between said fork and other items, including the drive sprocket.
• Said stroke c is equal to or slightly greater than the length l cut of the toothed portion of the drive pinion.
• the length of the shaft 420 of the electric motor projecting from said motor is only slightly longer than twice the stroke c and less than 2.5 times the length of this stroke, which also contributes to making said starter 400 more compact compared to the prior art.
• the shoulder 330 before the guide ring comes against the axial stop 431 of the shaft 420 for driving the electric motor starter 400.
• the majority plastic constitution of said guide ring makes it possible to dampen the shock against this stop and to limit the noise that results therefrom.
• the fork 440 is connected to the operating ring by means of two studs 540 in pivot connection with the fork 440 and which fit into the operating profile of said operating ring between the cheeks of said profile.
• a plastic constitution for example Delrin® of the operating ring promotes the sliding of said pads between the cheeks of the operating profile, so that a freewheeling mechanism between said fork and the drive pinion 220 is not necessary, which contributes to the compactness of the starter object of the invention.
• the axis 640 of the pads 540 connecting the fork 440 with the operating ring is advantageously placed under the axis 620 of the electric motor shaft. This arrangement allows, for a given fork length to reduce the distance d between the movable rod of the solenoid and the electric motor shaft and thus to reduce the compactness of the starter.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=49667373

Family Applications (1)

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• 2013
  • 2013-09-09 FR FR1358609A patent/FR3010459B1/fr not_active Expired - Fee Related
• 2014
  • 2014-09-08 KR KR1020167005879A patent/KR20160055143A/ko not_active Application Discontinuation
  • 2014-09-08 CN CN201480046951.0A patent/CN105492759B/zh not_active Expired - Fee Related
  • 2014-09-08 WO PCT/FR2014/052219 patent/WO2015033083A1/fr active Application Filing
  • 2014-09-08 EP EP14796158.5A patent/EP3044455A1/de not_active Withdrawn

Non-Patent Citations (1)

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