EP0385726B1 - Coaxial engine starter - Google Patents

Coaxial engine starter Download PDF

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Publication number
EP0385726B1
EP0385726B1 EP90302081A EP90302081A EP0385726B1 EP 0385726 B1 EP0385726 B1 EP 0385726B1 EP 90302081 A EP90302081 A EP 90302081A EP 90302081 A EP90302081 A EP 90302081A EP 0385726 B1 EP0385726 B1 EP 0385726B1
Authority
EP
European Patent Office
Prior art keywords
pinion
armature
indicates
rotary shaft
electric motor
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
Application number
EP90302081A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0385726A1 (en
Inventor
Shuzoo C/O Himeji Seisakusho Of Isozumi
Shigeru C/O Himeji Seisakusho Of Shiroyama
Akira C/O Himeji Seisakusho Of Morishita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0385726A1 publication Critical patent/EP0385726A1/en
Application granted granted Critical
Publication of EP0385726B1 publication Critical patent/EP0385726B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • F02N15/066—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 being of the coaxial type

Definitions

  • This invention relates to a coaxial engine starter for use with automotive engines.
  • Fig. 1 is a sectional view illustrating a conventional coaxial starter disclosed in Japanese Patent Laid-Open No. 63-192962, for example.
  • the reference numeral 1 designates an armature of a d.c. electric motor
  • 2 an armature core
  • 3 designates a hollow armature rotary shaft having formed inside thereof a wedge-shaped cam surface 3a for providing an over-running clutch function, and the armature core is press-fit onto the outer circumference of the armature rotary shaft 3.
  • the commutator 4 designates a commutator of the face type mounted at the rear outer circumference of the rotary shaft 3, the surface against which brushes 5 contact and slide for commutation is defined by a surface perpendicular to the rotary shaft 3.
  • the commutator 4 is connected to an armature coil 6 wound on the core 2.
  • the brush 5 is urged forward by a spring 5a disposed at its rear side so that the tip of the brush 5 is brought into contact under pressure onto the sliding surface of the commutator 4.
  • the rear bracket 9 has formed in the outer circumferential flange portion of the recess for accomodating the bearing 11 thereof a plurality of openings corresponding in position and in number to the brushes 5.
  • roller 16 designates rollers disposed on the cam 3a formed in the inner surface of the rotary shaft 3, providing an over-running function together with roller springs.
  • 17a indicates helical splines formed in the inner surface of the clutch inner member 17, the helical splines 17a engaging the helical splines 20c formed in the outer circumference of the middle portion of a pinion shaft 20 having a pinion 20a at its front end and a flange 20b for dust and water resistance.
  • 21 indicates a stopper mounted on the rear portion of the pinion shaft 20
  • 22 indicates a bearing for supporting the rear portion of the pinion shaft 20 mounted in the inner surface of the clutch inner member 17, the bearing 22 supporting the front end of a return spring 23 of the pinion shaft 20.
  • the pinion shaft 20 is moved forward along the axis while compressing the spring 23 by the stopper 21 until the stopper 21 abut against the rear end face 17b of the clutch inner member 17 at which the forward movement is completed.
  • the solenoid switch has a function of forwardly moving the pinion shaft 20 and a switching function for turning on the contacts to allow the power supply from the battery to the electric motor upon the closure of the key switch.
  • 26 indicates a movable assembly for pushing the pinion shaft 20 from the behind and having a movable contact 28 supported by insulators 27a and 27b.
  • 26a indicates a plunger, 26b a rod, 26c a second holder, 26d a first holder secured between the plunger 26a and the rod 26b and having mounted thereon the movable contact 28 and the like.
  • the rod 26b is secured to the plunger 26a by caulking its rear end on the rear surface of the plunger 26a.
  • 34a is a rear core and 34b is a front core, constituting together with a case 35 a magnetic circuit.
  • the excitation coil 33 When key switch is turned on, the excitation coil 33 is energized to actuate the plunger 26a, causing the movable assembly 26 to move forward and the movable contact 28 to be brought into contact with the stationary contact 13.
  • the armature coil 6 is energized through the brush 5 and the commutator 4 thereby to start the electric motor.
  • the pinion shaft 20 is pushed forward by the springs 29, 31 of the movable assembly 26, whereby the pinion 20a is brought into engagement with the ring gear formed around a fly wheel of an engine at the same time the d.c. motor is started.
  • the armature winding 6 has generally two turns in order to obtain requisite torque as the d.c. motor, making unable to make the outer diameter of the rotary shaft 3 large, so that the assembly of the over-running clutch within the rotary shaft 3 is difficult and disadvantageous in performance because it is necessary to use small-diameter long rollers or a plurality of small-diameter rollers axially arranged in series.
  • one object of the present invention is to provide a coaxial engine starter free from the above-discussed problems.
  • Another object of the present invention is to provide a coaxial engine starter in which the requisite d.c. motor torque is ensured.
  • Another object of the present invention is to provide a coaxial engine starter in which the over-running clutch can be easily assembled and which has a superior performance.
  • the number of the teeth of the pinion is made equal to or less than seven, thereby making the gear ratio between the engine ring gear and the pinion greater than that of pinion having the teeth number of eight which is the smallest number in the conventional design, a sufficient torque can be obtained even with a single turn armature winding, and by making the armature winding single-turn, the outer diameter of the rotary shaft can be made large, improving the easiness of assembly of the over-running clutch within the rotary shaft.
  • Fig. 2 the same reference numerals used in Fig. 1 designate the same components.
  • 1 designates an armature of a d.c. electric motor
  • 2 an armature core
  • 3 designates a hollow armature rotary shaft having formed inside thereof a wedge-shaped cam surface 3a for providing a function of an over-running clutch 7, and the armature core 2 is press-fit onto the outer circumference of the armature rotary shaft 3.
  • the commutator 4 designates a commutator of the face type mounted at the rear outer circumference of the rotary shaft 3, the surface against which brushes 5 contact and slide for commutation is defined by a surface perpendicular to the rotary shaft 3.
  • the commutator 4 is connected to an armature coil 6a wound on the core 2.
  • the armature coil 6a is a single turn coil.
  • the brush 5 is urged forward by a spring 5a disposed at its rear side so that the tip of the brush 5 is brought into contact under pressure onto the sliding surface of the commutator 4.
  • the rear bracket 9 has formed in the outer circumferential flange portion of the recess for accomodating the bearing 11 thereof a plurality of openings corresponding in position and in number to the brushes 5.
  • roller 16 designates rollers disposed on the cam 3a formed in the inner surface of the rotary shaft 3, providing an over-running function together with roller springs.
  • 17a indicates helical splines formed in the inner surface of the clutch inner member 17, the helical splines 17a engaging the helical splines 20c formed in the outer circumference of the middle portion of a pinion shaft 20 having a pinion 20d at its front end and a flange 20b for dust and water resistance.
  • the number of gear teeth of the pinion 20d is equal to or less than seven.
  • 21 indicates a stopper mounted on the rear portion of the pinion shaft 20
  • 22 indicates a bearing for supporting the rear portion of the pinion shaft 20 mounted in the inner surface of the clutch inner member 17, the bearing 22 supporting the front end of a return spring 23 of the pinion shaft 20.
  • the pinion shaft 20 is moved forward along the axis while compressing the spring 23 by the stopper 21 until the stopper 21 abut against the rear end face 17b of the clutch inner member 17 at which the forward movement is completed.
  • the solenoid switch has a function of forwardly moving the pinion shaft 20 and a switching function for turning on the contacts to allow the power supply from the battery to the electric motor upon the closure of the key switch.
  • 26 indicates a movable assembly for pushing the pinion shaft 20 from the behind and having a movable contact 28 supported by insulators 27a and 27b.
  • 26a indicates a plunger, 26b a rod, 26c a second holder, 26d a first holder secured between the plunger 26a and the rod 26b and having mounted thereon the movable contact 28 and the like.
  • the rod 26b is secured to the plunger 26a by caulking its rear end on the rear surface of the plunger 26a.
  • 29 indicates a spring for urging the pinioin shaft 20, the spring 29 being disposed at the outer circumference of the rod 26b between the first holder 26d and the second holder 26c.
  • 34a is a rear core and 34b is a front core, constituting together with a case 35 a magnetic circuit.
  • the excitation coil 33 When the key switch is turned on, the excitation coil 33 is energized to actuated the plunger 26a, causing the movable assembly 26 to move forward until the movable contact 28 engages the stationary contact 13.
  • the armature coil 6 is energized through the brush 5 and the commutator 4 thereby to start the electric motor.
  • the pinion shaft 20 is pushed forward by the springs 29, 31 of the movable assembly 26, whereby the pinion 20d is brought into engagement with the ring gear formed around a fly wheel of an engine at the same time the d.c. motor is started.
  • commutator 4 While the face-type commutator is employed as the commutator 4 in the above embodiment, a commutator of another type may equally be used.
  • the permanent magnet 7 is used for generating a motor magnetic field, this may be replaced with a magnetic pole with a coil wound on it.
  • the pinion shaft 20 and the pinion 20d are made integral, the pinion 20d may be spline-engaged with the pinion shaft 20 and mounted by a stopper.
  • the pinion shaft including pinion gear teeth in the inside of the clutch inner member of the over-running clutch may be separate members, and any arrangement for transmiting power between the pinion and the clutch inner member of the over-running clutch can be employed.
  • the size of the teeth of the pinion or the module is not discussed, the smaller module is preferred from the view point of overall engine arrangement because the engine ring gear needs not be made large-sized, and the present invention is effective when applied to the pinion having a module of equal to or less than 2.75.
  • the greater pressure angle of the gear is preferred because the number of teeth can be made as small as possible, the preferable pressure angle being equal to or larger than 14.5°and the more preferred pressure angle being equal to or larger than 20°.

Landscapes

  • 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)
EP90302081A 1989-02-27 1990-02-27 Coaxial engine starter Expired - Lifetime EP0385726B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1047526A JPH02223671A (ja) 1989-02-27 1989-02-27 同軸形スタータ
JP47526/89 1989-02-27

Publications (2)

Publication Number Publication Date
EP0385726A1 EP0385726A1 (en) 1990-09-05
EP0385726B1 true EP0385726B1 (en) 1995-09-13

Family

ID=12777567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90302081A Expired - Lifetime EP0385726B1 (en) 1989-02-27 1990-02-27 Coaxial engine starter

Country Status (4)

Country Link
EP (1) EP0385726B1 (ko)
JP (1) JPH02223671A (ko)
KR (1) KR940009055B1 (ko)
DE (1) DE69022263T2 (ko)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2793741B2 (ja) * 1992-05-29 1998-09-03 三菱電機株式会社 同軸形始動電動機
JP2002138931A (ja) * 2000-11-06 2002-05-17 Denso Corp エンジン始動装置
KR100870308B1 (ko) * 2001-06-29 2008-11-25 발레오 에뀝망 엘렉뜨리끄 모떼르 차량 시동기

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1435101A (en) * 1921-03-21 1922-11-07 Brisbois Odilon Starter for internal-combustion engines
FR2310009A1 (fr) * 1975-05-02 1976-11-26 N I Experiment Avtomobilnogo Enroulement a barres rigides pour machine electrique et machine-outil pour la fabrication dudit enroulement
KR910001693B1 (ko) * 1987-01-23 1991-03-18 미쯔비시 덴끼 가부시끼가이샤 엔진용 시동기

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
"Dyke's Automobile and Gasoline engine Encyclopedia", A. L. Dyke, 1950, The Goodheart-Willcox Company Inc., Chicago: page 326 *
"Elektrische Zündung, Licht und anlasser der Kraftfahrzeuge", pages 198 to 201, by E. Seiler, Wilhelm Knapp Verlag, Halle, 1938 *
"Elektrische Zündung, Licht und Anlasser der Kraftfahrzeuge", pages 52 to 55, by E. Seiler, Wilhelm Knapp Verlag, Halle, 1926 *
"Maschinenelemente" Band II, G. Niemann and H. Winter, Springer Verlag, Berlin, 1985: pages 36 to 39, 67 to 70, 273, 274, 368 and 369 *
Bosch, Technische Unterrichtung VDT-B6/3 (1.75), p. 2, 12, 15, 19, Bosch GmbH, Stuttgart, 1975 *
Bosch, Technische Unterrichtung VDT-U1/11 (2.84), p. 28, Robert Bosch GmbH, Stuttgart, 1984 *

Also Published As

Publication number Publication date
JPH02223671A (ja) 1990-09-06
EP0385726A1 (en) 1990-09-05
DE69022263D1 (de) 1995-10-19
KR900013199A (ko) 1990-09-05
KR940009055B1 (ko) 1994-09-29
DE69022263T2 (de) 1996-05-15

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