EP0385726B1 - Coaxial engine starter - Google Patents
Coaxial engine starter Download PDFInfo
- 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
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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
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- 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°.
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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)
Description
- 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. In Fig. 1, the reference numeral 1 designates an armature of a d.c. electric motor, 2 an armature core, and 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 armaturerotary shaft 3. - 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 therotary shaft 3. Thecommutator 4 is connected to anarmature coil 6 wound on thecore 2. - The
brush 5 is urged forward by aspring 5a disposed at its rear side so that the tip of thebrush 5 is brought into contact under pressure onto the sliding surface of thecommutator 4. - 7 indicates permanent magnets mounted at the inner circumference of the
yoke 8 defining a magnetic circuit for generating a magnetic field in the armature 1. The rear end of theyoke 8 is fitted onto therear bracket 9 and the front end of theyoke 8 is fitted onto thefront bracket 10. - 11 indicates a bearing fitted onto the rear end of the
rotary shaft 3 and is supported by therear bracket 9. Therear bracket 9 has formed in the outer circumferential flange portion of the recess for accomodating thebearing 11 thereof a plurality of openings corresponding in position and in number to thebrushes 5. - 12 designates a plastic brush holder which houses therein the
brush 5 and thespring 5a and hasstationary contacts 13 for connection to an unillustrated terminal insert-molded at its rear portion, thestationary contacts 13 having secured thereto, by ascrew 15, aterminal 14 on which alead wire 5b of thepositive side brush 5 is welded. - 16 designates rollers disposed on the
cam 3a formed in the inner surface of therotary shaft 3, providing an over-running function together with roller springs. - 17 designates a clutch inner member of the over-running clutch mechanism having a
bearing 18 mounted on the outer circumference of the middle portion thereof to support the front end of therotary shaft 3. - 19 indicates a bearing mounted within the
front bracket 10 and supports the front end of the clutchinner member 17. - 17a indicates helical splines formed in the inner surface of the clutch
inner member 17, thehelical splines 17a engaging thehelical splines 20c formed in the outer circumference of the middle portion of apinion shaft 20 having apinion 20a at its front end and aflange 20b for dust and water resistance. - 21 indicates a stopper mounted on the rear portion of the
pinion shaft pinion shaft 20 mounted in the inner surface of the clutchinner member 17, thebearing 22 supporting the front end of areturn spring 23 of thepinion shaft 20. - The
pinion shaft 20 is moved forward along the axis while compressing thespring 23 by thestopper 21 until thestopper 21 abut against therear end face 17b of the clutchinner member 17 at which the forward movement is completed. - 24 indicates a solenoid switch attached to the
rear bracket 9 bybolts 25, the solenoid switch has a function of forwardly moving thepinion 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 amovable contact 28 supported byinsulators - 26a indicates a plunger, 26b a rod, 26c a second holder, 26d a first holder secured between the
plunger 26a and therod 26b and having mounted thereon themovable contact 28 and the like. Therod 26b is secured to theplunger 26a by caulking its rear end on the rear surface of theplunger 26a. - 29 indicates a spring for urging the
pinioin shaft 20, thespring 29 being disposed at the outer circumference of therod 26b between the first holder 26d and thesecond holder 26c. - 30 indicates a third holder which urges the
pinion shaft 20 by acompression spring 31. - 32 indicates a steel ball disposed between the front end of the
third holder 30 and a recessed portion of the rear end of thepinion shaft 20 and having a function of supporting a thrust force. - 33 indicates an excitation coil wound on the
bobbin 33a of a plastic material for energizing theplunger 26a. 34a is a rear core and 34b is a front core, constituting together with a case 35 a magnetic circuit. - 36 indicates a plate of a nonmagnetic material, which is a rear wall of the
solenoid switch 24 serving as a stopper for theplunger 26a when it is rearwardly returned. - 37 indicates a packing disposed between the
case 35 and theplate 36 and having a water resisting function. - 38 indicates a spring disposed between the
plunger 26a and thefront core 34b for returning themovable assembly 26 to its home position when the key switch is turned off. - 39 is a through bolt connecting the
rear bracket 9 and thefront bracket 10. - The operation will now be described. First, in the state in which key switch is off, the
excitation coil 33 is not excited because it is in the non-conductive state, and since only the spring force of thespring 38 acts on theplunger 26a, themovable assembly 26 is positioned at the rear portion and theplunger 26a is brought into abutment with theplate 36. - In this state, the
stationary contact 13 and themovable contact 28 are in the separated state, so that the electric motor is stopped and thepinion shaft 20 is also located at the rear portion by thespring 23 and stand still with the rear surface of theflange 20b brought into abutment with the front surface of the clutchinner member 17. - When key switch is turned on, the
excitation coil 33 is energized to actuate theplunger 26a, causing themovable assembly 26 to move forward and themovable contact 28 to be brought into contact with thestationary contact 13. - Therefore, the
armature coil 6 is energized through thebrush 5 and thecommutator 4 thereby to start the electric motor. - On the other hand, the
pinion shaft 20 is pushed forward by thesprings movable assembly 26, whereby thepinion 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. - Immediately after the starting of the engine, the
pinion shaft 20 and the clutchinner member 17 are moved together with the ring gear due to the uni-directional over-running function, idling relative to the armature 1. - When the key switch is turned off when the starting has been completed, the electrical power is disconnected, the
movable assembly 26 rearwardly returns due to the function of thespring 38 within thesolenoid switch 24, and thepinion shaft 20 rearwardly returns by the function of thespring 23. - Since the conventional coaxial starter is constructed as above described, the number of teeth of the pinion is eight at the smallest, and with such the starter, 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 therotary 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. - Accordingly, 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.
- With the pinion according to the present invention, 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.
- The present invention will become more readily apparent from the following detailed description of the preferred embodiment of the present invention taken in conjunction with the accompanying draings, in which
- Fig. 1 is a sectional view of the conventional coaxial engine starter; and
- Fig. 2 is a sectional view of the coaxial engine starter of one embodiment of the present invention.
- In 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, and 3 designates a hollow armature rotary shaft having formed inside thereof a wedge-
shaped cam surface 3a for providing a function of an over-runningclutch 7, and thearmature core 2 is press-fit onto the outer circumference of the armaturerotary shaft 3. - 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 therotary shaft 3. Thecommutator 4 is connected to anarmature coil 6a wound on thecore 2. - According to the present invention, the
armature coil 6a is a single turn coil. - The
brush 5 is urged forward by aspring 5a disposed at its rear side so that the tip of thebrush 5 is brought into contact under pressure onto the sliding surface of thecommutator 4. - 7 indicates permanent magnets mounted at the inner circumference of the
yoke 8 defining a magnetic circuit for generating a magnetic field in the armature 1. The rear end of theyoke 8 is fitted onto therear bracket 9 and the front end of theyoke 8 is fitted onto thefront bracket 10. - 11 indicates a bearing fitted onto the rear end of the
rotary shaft 3 and is supported by therear bracket 9. Therear bracket 9 has formed in the outer circumferential flange portion of the recess for accomodating thebearing 11 thereof a plurality of openings corresponding in position and in number to thebrushes 5. - 12 designates a plastic brush holder which houses therein the
brush 5 and thespring 5a and hasstationary contacts 13 for connection to an unillustrated terminal insert-molded at its rear portion, thestationary contacts 13 having secured thereto, by ascrew 15, a terminal 14 on which alead wire 5b of thepositive side brush 5 is welded. - 16 designates rollers disposed on the
cam 3a formed in the inner surface of therotary shaft 3, providing an over-running function together with roller springs. - 17 designates a clutch inner member of the over-running clutch mechanism having a bearing 18 mounted on the outer circumference of the middle portion thereof to support the front end of the
rotary shaft 3. - 19 indicates a bearing mounted within the
front bracket 10 and supports the front end of the clutchinner member 17. - 17a indicates helical splines formed in the inner surface of the clutch
inner member 17, thehelical splines 17a engaging thehelical splines 20c formed in the outer circumference of the middle portion of apinion shaft 20 having apinion 20d at its front end and aflange 20b for dust and water resistance. - According to the present invention, 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 pinion shaft 20 mounted in the inner surface of the clutchinner member 17, the bearing 22 supporting the front end of areturn spring 23 of thepinion shaft 20. - The
pinion shaft 20 is moved forward along the axis while compressing thespring 23 by thestopper 21 until thestopper 21 abut against therear end face 17b of the clutchinner member 17 at which the forward movement is completed. - 24 indicates a solenoid switch attached to the
rear bracket 9 bybolts 25, the solenoid switch has a function of forwardly moving thepinion 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 amovable contact 28 supported byinsulators - 26a indicates a plunger, 26b a rod, 26c a second holder, 26d a first holder secured between the
plunger 26a and therod 26b and having mounted thereon themovable contact 28 and the like. - The
rod 26b is secured to theplunger 26a by caulking its rear end on the rear surface of the plunger 26a. 29 indicates a spring for urging thepinioin shaft 20, thespring 29 being disposed at the outer circumference of therod 26b between the first holder 26d and thesecond holder 26c. - 30 indicates a third holder which urges the
pinion shaft 20 by acompression spring 31. - 32 indicates a steel ball disposed between the front end of the
third holder 30 and a recessed portion of the rear end of thepinion shaft 20 and having a function of supporting a thrust force. - 33 indicates an excitation coil wound on the
bobbin 33a of a plastic material for energizing theplunger 26a. 34a is a rear core and 34b is a front core, constituting together with a case 35 a magnetic circuit. - 36 indicates a plate of a nonmagnetic material, which is a rear wall of the
solenoid switch 24 serving as a stopper for theplunger 26a when it is rearwardly returned. - 37 indicates a packing disposed between the
case 35 and theplate 36 and having a water resisting function. - 38 indicates a spring disposed between the
plunge 26a and thefront core 34b for returning themovable assembly 26 to its home position when the key switch is turned off. - 39 is a through bolt connecting the
rear bracket 9 and thefront bracket 10. - The operation will now be described. First, in the state in which key switch is off, the
excitation coil 33 is not excited because it is in the non-conductive state, and since only the spring force of thespring 38 acts on theplunger 26a, themovable assembly 26 is positioned at the rear portion and theplunger 26a is brought into abutment with theplate 36. - In this state, the
stationary contact 13 and themovable contact 28 are in the separated state, so that the electric motor is stopped and thepinion shaft 20 is also located at the rear portion by thespring 23 and stand still with the rear surface of theflange 20b brought into abutment with the front surface of the clutchinner member 17. - When the key switch is turned on, the
excitation coil 33 is energized to actuated theplunger 26a, causing themovable assembly 26 to move forward until themovable contact 28 engages thestationary contact 13. - Therefore, the
armature coil 6 is energized through thebrush 5 and thecommutator 4 thereby to start the electric motor. - On the other hand, the
pinion shaft 20 is pushed forward by thesprings movable assembly 26, whereby thepinion 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. - Immediately after the starting of the engine, the
pinion shaft 20 and the clutchinner member 17 are moved together with the ring gear due to the uni-directional over-running function, idling relative to the armature 1. - When the key switch is turned off when the starting has been completed, the electrical power is disconnected, the
movable assembly 26 rearwardly returns due to the function of thespring 38 within thesolenoid switch 24, and thepinion shaft 20 rearwardly returns by the function of thespring 23. - While the face-type commutator is employed as the
commutator 4 in the above embodiment, a commutator of another type may equally be used. - Also, while 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. - Also, although the
pinion shaft 20 and thepinion 20d are made integral, thepinion 20d may be spline-engaged with thepinion shaft 20 and mounted by a stopper. - Further, while the above embodiment has been described as having the pinion shaft including pinion gear teeth in the inside of the clutch inner member of the over-running clutch, the pinion gear teeth and the shaft 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.
- Moreover, in the above description, although 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. Also, 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°.
Claims (2)
- A coaxial engine starter comprising an electric motor having armature windings (6a) provided in an armature core (2) which is mounted on a hollow armature rotary shaft (3) for generating a rotational force for starting an engine; an over-running clutch mechanism (17) disposed within said hollow armature rotary shaft for preventing the occurrence of an excessive-speed of said armature and having a pinion (20) having gear teeth for engaging with a ring gear of an engine upon starting of said electric motor; and a solenoid switch (24) disposed behind said electric motor for moving a pinion shaft (20, 26) forward and supplying electric power to said electric motor, characterised in that the number of gear teeth of the pinion (20) is equal to or less than seven; the armature windings (6a) are single turn coils thereby reducing the armature core (2) thickness; and the outer and inner diameter of the rotary shaft is resultingly relatively large, thereby to enable the clutch mechanism (17) to be relatively large.
- A coaxial engine starter according to claim 1, wherein the pinion has a module of 2.75 or less and a pressure angle equal to or larger than 14.5°.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP47526/89 | 1989-02-27 | ||
JP1047526A JPH02223671A (en) | 1989-02-27 | 1989-02-27 | Coaxial type starter |
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 (en) |
JP (1) | JPH02223671A (en) |
KR (1) | KR940009055B1 (en) |
DE (1) | DE69022263T2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2793741B2 (en) * | 1992-05-29 | 1998-09-03 | 三菱電機株式会社 | Coaxial starting motor |
JP2002138931A (en) * | 2000-11-06 | 2002-05-17 | Denso Corp | Engine starter |
KR100870308B1 (en) * | 2001-06-29 | 2008-11-25 | 발레오 에뀝망 엘렉뜨리끄 모떼르 | Motor vehicle starter with improved drive assembly |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1435101A (en) * | 1921-03-21 | 1922-11-07 | Brisbois Odilon | Starter for internal-combustion engines |
FR2310009A1 (en) * | 1975-05-02 | 1976-11-26 | N I Experiment Avtomobilnogo | Electric motor core windings - comprises single winding coils from rectangular cross section wire |
EP0277566B1 (en) * | 1987-01-23 | 1992-09-02 | Mitsubishi Denki Kabushiki Kaisha | Engine starter |
-
1989
- 1989-02-27 JP JP1047526A patent/JPH02223671A/en active Pending
-
1990
- 1990-01-09 KR KR1019900000174A patent/KR940009055B1/en not_active IP Right Cessation
- 1990-02-27 EP EP90302081A patent/EP0385726B1/en not_active Expired - Lifetime
- 1990-02-27 DE DE69022263T patent/DE69022263T2/en not_active Expired - Fee Related
Non-Patent Citations (6)
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 * |
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Also Published As
Publication number | Publication date |
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KR940009055B1 (en) | 1994-09-29 |
EP0385726A1 (en) | 1990-09-05 |
KR900013199A (en) | 1990-09-05 |
DE69022263D1 (en) | 1995-10-19 |
JPH02223671A (en) | 1990-09-06 |
DE69022263T2 (en) | 1996-05-15 |
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