JP2010048130A - Engine starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve durability of an engine starter by reducing impact upon meshing of a pinion gear and a ring gear and lessening wear of both gears. <P>SOLUTION: The engine starter 1 includes the pinion gear 6 which axially moves on a drive shaft 4 and meshes with the ring gear 8 of an engine, a motor 2 for rotation-driving the pinion gear 6, and a switch unit 42 operated by a magnet switch 7 arranged coaxially with the drive shaft 4 and controlling the operation of the motor 2. A switch stroke Ls when the switch unit 42 is changed from an Off state to an ON state is larger than a distance Lp between the pinion gear 6 and the ring gear 8 when the switch unit 42 in the Off state, or a distance for which the pinion gear 6 moves until it contacts with the ring gear 8 (Ls>Lp). The pinion gear 6 rotates after contact with the ring gear 8 and both gears 6, 8 smoothly mesh with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an engine starting device that starts an engine by meshing a pinion gear driven by an electric motor with a ring gear of the engine, and in particular, an engine of a type in which the pinion gear moves in the axial direction by the rotational force of the motor and meshes with the ring gear. It relates to a starting device.

  An engine used for an automobile, a motorcycle, a large generator, or the like is generally started by an engine starter (starter) using an electric motor. For example, Patent Document 1 describes an engine starting device of a type in which a pinion gear moves in an axial direction by a rotational force of a motor and meshes with an engine ring gear. FIG. 2 is a cross-sectional view showing the configuration of such an engine starting device. The engine starting device 101 of FIG. 2 includes a pinion gear 103 that meshes with the ring gear 102 of the engine, and is driven by an electric motor 104.

  In the engine starter 101, the rotation of the motor 104 is transmitted to the output shaft 106 via the speed reducer 105 using a planetary gear. An overrunning clutch 109 having a clutch outer 107 and a clutch inner 108 is attached to the output shaft 106. The clutch outer 107 is attached to the output shaft 106 via a helical spline portion 111. A roller 112 is interposed between the clutch outer 107 and one end of the clutch inner 108, so that the overrunning clutch 109 transmits only rotation in one direction. The clutch inner 108 is attached to the output shaft 106 so as to be movable in the axial direction, and a pinion gear 103 is formed on the other end side.

When the motor 104 is operated, the clutch outer 107 is rotated together with the output shaft 106. As the clutch outer 107 rotates, the clutch outer 107 moves to the left in the figure by the action of the helical spline portion 111. As the clutch outer 107 moves, the clutch inner 108 also moves to the left in the figure while rotating. As a result, the pinion gear 103 moves in the axial direction while rotating, and meshes with the ring gear 102 to start the engine as shown in the lower half of FIG.
Japanese Patent Laid-Open No. 10-318105 Japanese Unexamined Patent Publication No. 2005-2860

  However, in such an engine starter, the pinion gear 103 contacts and meshes with the ring gear 102 while rotating, so that there is a problem that the impact force applied to both gears during engagement is large. When a large impact force is applied to both gears when the gears are engaged, there is a problem that not only a gear impact sound is generated when the engine is started, but also the wear of both gears is increased due to the impact force at the time of engagement.

  An object of the present invention is to alleviate an impact when a pinion gear and a ring gear are engaged with each other, suppress wear of both gears, and improve durability of the engine starter.

  An engine starter according to the present invention includes a pinion gear that meshes with a ring gear of an engine by moving in an axial direction on a drive shaft, a motor for rotationally driving the pinion gear, and the engine arranged coaxially with the drive shaft. A magnet switch that operates in accordance with ON / OFF of the ignition switch, and a switch unit that is operated by the magnet switch and controls the operation of the motor, and the pinion gear is axially interlocked with the operation of the switch unit. A moving engine starting device, wherein the switch portion has an operating distance of an electrical contact when the switch portion is changed from an OFF state to an ON state, and the pinion gear and the ring gear when the switch portion is OFF. It is characterized by being larger than the distance between them.

  In the present invention, since the operating distance of the electrical contact of the switch part is larger than the moving distance until the pinion gear and the ring gear abut, the switch part does not close before the pinion gear abuts the ring gear, and the pinion gear The motor rotates after contacting the ring gear. For this reason, the pinion gear meshes with the ring gear without being driven to rotate, and both gears mesh smoothly without generating a large impact force.

  In the engine starting device, the electrical contact of the switch unit includes a first plate connected to the motor side and a second plate connected to the power source side and separated from the first plate by an insulating unit. A switch disposed at a distance from the plate and the conductive plate and contacting the first and second plates to electrically connect the insulating portion and electrically connect the motor side and the power source side A plate may be provided.

  In the engine starter, the switch plate may be brought into contact with or separated from the conductive plate, or the pinion gear may be moved in the axial direction in conjunction with the operation of the magnet switch.

  Further, the magnet switch is provided with a fixed part including a coil electrically connected to the ignition switch and a bobbin in which the coil is accommodated, and is provided so as to be relatively movable with respect to the fixed part. A movable portion having a connected movable iron core, a gear plunger provided on the inner peripheral side of the movable iron core on the drive shaft and in contact with the movable iron core via a sliding iron core, and the drive shaft An overrunning clutch having a clutch outer disposed on the formed helical spline portion and in contact with one end side of the gear plunger and a clutch inner formed with the pinion gear is provided movably in the axial direction, and the ignition switch When it is turned on, the coil is energized and the movable And the gear plunger moves in the axial direction, and the movement of the gear plunger causes the pinion gear to move in the axial direction as the overrunning clutch moves along the axial direction on the helical spline portion. The pinion gear may come into contact with the ring gear before the electrical contact of the switch portion is closed. Thus, in the engine starting device, the magnet switch functions as an electromagnetic push-in mechanism that meshes the pinion gear with the ring gear.

  According to the engine starter of the present invention, a motor driven by a pinion gear that is rotationally driven by a motor and axially moves on the drive shaft and meshes with a ring gear of the engine, and a magnet switch arranged coaxially with the drive shaft. In the engine starter, in which the pinion gear moves in conjunction with the operation of the switch unit, the operating distance of the electrical contact of the switch unit is determined from the moving distance until the pinion gear and the ring gear abut. Therefore, the motor can be driven to rotate after the pinion gear and the ring gear come into contact with each other. For this reason, the pinion gear and the ring gear can be meshed without generating a large impact force, and wear of both gears due to the impact during meshing can be suppressed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of an engine starter according to an embodiment of the present invention, in which the upper side from the center line indicates a stationary state, and the lower side indicates an energized state. An engine starter (starter) 1 shown in FIG. 1 is used for starting an automobile engine, and includes an electric motor (hereinafter abbreviated as a motor) 2 as a drive source. The motor 2 is connected to a reduction gear 3, and the rotation of the motor 2 is transmitted to the drive shaft 4 via the reduction gear 3. An overrunning clutch 5 and a pinion gear 6 are provided on the drive shaft (output shaft) 4 so as to be movable in the axial direction. The engine starter 1 is a single-axis type starter in which a magnet switch 7 is arranged coaxially with the drive shaft 4, and the pinion gear 6 is axially moved together with the overrunning clutch 5 by the action of the magnet switch 7. It moves and meshes with the ring gear 8 of the engine.

  The motor 2 has a configuration in which an armature 22 is rotatably disposed in a cylindrical motor housing 21. The motor housing 21 also serves as the yoke of the motor 2 and is made of a magnetic metal such as iron. A metal end cover 23 is attached to the right end portion of the motor housing 21. On the other hand, the left end portion of the motor housing 21 is attached to a gear cover 24 in which the pinion gear 6 is accommodated. The end cover 23 is fixed to the gear cover 24 by a set bolt 25, and the motor housing 21 is fixed between the end cover 23 and the gear cover 24.

  A plurality of magnets 26 are fixed in the circumferential direction on the inner peripheral surface of the motor housing 21, and the armature 22 is disposed inside the magnets 26. The armature 22 includes an armature core 28 fixed to the motor shaft 27 and an armature coil 29 wound around the armature core 28. The right end portion of the motor shaft 27 is rotatably supported by a metal bearing 31 attached to the end cover 23. On the other hand, the left end portion of the motor shaft 27 is rotatably supported by the end portion of the drive shaft 4 to which the pinion gear 6 and the like are attached. A bearing portion 32 is recessed at the right end portion of the drive shaft 4, and the motor shaft 27 is rotatably supported by a metal bearing 33 attached thereto. As a result, the drive shaft 4 is arranged coaxially with the motor shaft 27 of the motor 2.

  A commutator 34 that is externally fitted and fixed to the motor shaft 27 is disposed adjacent to one end side of the armature core 28. A plurality of commutator pieces 35 formed of a conductive material are attached to the outer peripheral surface of the commutator 34, and the end of the armature coil 29 is fixed to each commutator piece 35. A brush holder 36 is attached to the left end portion of the motor housing 21. In the brush holder 36, a plurality of brush accommodating portions 37 are arranged at intervals in the circumferential direction. Each brush accommodating portion 37 is internally provided with a brush 38 that can be moved in and out. The protruding tip end (inner diameter side tip) of the brush 38 is in sliding contact with the outer peripheral surface of the commutator 34.

  A pigtail (not shown) is attached to the rear end side of the brush 38 and is electrically connected to the first plate 41 a of the conductive plate 41 provided in the brush holder 36. The conductive plate 41 includes the first plate 41a and a second plate 41b that is electrically connected to the power terminal 44. The insulating portion 41c that insulates the plates 41a and 41b from each other. Is provided. A switch plate 43 is disposed opposite to the insulating portion 41 c, and a switch portion 42 is formed by both electrical contacts of the conductive plate 41 (first and second plates 41 a and 41 b) and the switch plate 43.

  The switch plate 43 is attached to the switch shaft 45, and when the ignition switch of the engine is turned on and the magnet switch 7 is energized, the switch shaft 45 moves to the left. When the switch plate 43 comes into contact with the first and second plates 41a and 41b, the insulating portion 41c is conducted and the switch portion 42 is turned on. As a result, the power terminal 44 and the brush 38 are electrically connected, and power is supplied to the commutator 34. On the other hand, when the ignition switch is OFF, the insulating portion 41c is opened and the switch portion 42 is turned OFF, and the switch stroke Ls (operating distance of the switch plate 43) is between the conductive plate 41 and the switch plate 43. A minute gap is formed.

  The planetary gear mechanism 11 of the reduction gear 3 is provided with an internal gear unit 46 and a drive plate unit 47. The internal gear unit 46 is fixed to the right end portion of the gear cover 24, and an internal ring gear 48 is formed on the inner peripheral side thereof. A metal bearing 49 is housed in the center of the internal gear unit 46, and the right end side of the drive shaft 4 is rotatably supported. The drive plate unit 47 is fixed to the right end of the drive shaft 4, and planetary gears 51 are attached at equal intervals. The planetary gear 51 is rotatably supported by a support pin 53 fixed to the base plate 52 via a metal bearing 54. The planetary gear 51 meshes with the internal ring gear 48.

  A sun gear 55 is formed at the left end of the motor shaft 27. The sun gear 55 meshes with the planetary gear 51, and the planetary gear 51 revolves between the sun gear 55 and the internal ring gear 48 while rotating. When the motor 2 operates, the sun gear 55 rotates together with the motor shaft 27, and the planetary gear 51 revolves around the sun gear 55 while meshing with the internal ring gear 48 as the sun gear 55 rotates. As a result, the base plate 52 fixed to the drive shaft 4 rotates, and the rotation of the motor shaft 27 is decelerated and transmitted to the drive shaft 4.

  The overrunning clutch 5 transmits the rotation decelerated by the planetary gear mechanism 11 to the pinion gear 6 in one rotation direction. The overrunning clutch 5 has a configuration in which a roller 58 and a clutch spring (not shown) are arranged between a clutch outer 56 and a clutch inner 57. The clutch outer 56 includes a boss portion 56 a and a clutch portion 56 b, and the boss portion 56 a is attached to the helical spline portion 61 of the drive shaft 4. A spline portion 62 that meshes with the helical spline portion 61 is formed on the inner peripheral side of the boss portion 56a. As a result, the clutch outer 56 can move in the axial direction along the helical spline portion 61 on the drive shaft 4.

  A stopper 63 is attached to the drive shaft 4. The stopper 63 is restricted from moving in the axial direction by a circlip 64 attached to the drive shaft 4. One end of a gear return spring 65 is attached to the stopper 63. The other end side of the gear return spring 65 is in contact with the inner end wall 66 of the boss portion 56a. The clutch outer 56 is urged to the right by the gear return spring 65, and the clutch outer 56 is held at a position in contact with a clutch stopper 67 fixed to the gear cover 24 during normal operation (when power is not supplied). Is done.

  A clutch inner 57 formed integrally with the pinion gear 6 is disposed on the inner periphery of the clutch portion 56 b of the clutch outer 56. A plurality of sets of rollers 58 and clutch springs are disposed between the clutch outer 56 and the clutch inner 57. A clutch cover 68 is externally provided on the outer periphery of the clutch portion 56 b, and a clutch washer 69 is attached between the left end surface of the clutch portion 56 b and the clutch cover 68. By this clutch washer 69, the roller 58 and the clutch spring are accommodated on the inner peripheral side of the clutch portion 56b in a state where movement in the axial direction is restricted.

  The inner peripheral wall of the clutch portion 56b is a cam surface, and a wedge-shaped slope portion and a curved surface portion are formed. The roller 58 is normally pushed to the curved surface side by a clutch spring. When the clutch outer 56 rotates and the roller 58 is sandwiched between the wedge-shaped inclined surface and the outer peripheral surface of the clutch inner 57 against the urging force of the clutch spring, the clutch inner 57 is connected to the clutch outer via the roller 58. Rotate integrally with 56. As a result, when the motor 2 operates and the drive shaft 4 rotates, the rotation is transmitted from the clutch outer 56 to the clutch inner 57 via the roller 58, and the pinion gear 6 rotates.

  On the other hand, when the engine is started and the clutch inner 57 rotates faster than the clutch outer 56, the roller 58 moves to the curved surface side, and the clutch inner 57 is idled with respect to the clutch outer 56. That is, when the clutch inner 57 is in an overrun state, the roller 58 is not sandwiched between the wedge-shaped slope and the outer peripheral surface of the clutch inner, and the rotation of the clutch inner 57 is not transmitted to the clutch outer 56. Therefore, even if the clutch inner 57 is rotated at a higher rotational speed from the engine side after the engine is started, the rotation is interrupted by the overrunning clutch 5 and is not transmitted to the motor 2 side.

  A pinion gear 6 is integrally formed on the left end side of the clutch inner 57. The pinion gear 6 (clutch inner 57) is a steel member formed by cold forging, and chrome steel (for example, SCr 420H) subjected to carburizing treatment is used. A shaft hole 71 is formed on the inner diameter side of the pinion gear 6, and a pinion gear metal 72 is attached to the shaft hole 71. The pinion gear 6 is rotatably supported by the drive shaft 4 via the pinion gear metal 72. On the other hand, a spring accommodating portion 73 is formed on the inner diameter side of the clutch inner 57, and a stopper 63 and a gear return spring 65 are accommodated therein.

  The magnet switch 7 is arranged coaxially with the drive shaft 4 on the left side of the planetary gear mechanism 11 and is concentric with the motor 2 and the planetary gear mechanism 11. The magnet switch 7 includes a steel fixed portion 74 fixed to the gear cover 24 and a movable portion 75 that is movable in the left-right direction along the bobbin 78, that is, is movable relative to the bobbin 78. The fixed portion 74 is provided with a case 76 fixed to the gear cover 24, a coil 77 accommodated in the case 76, and a bobbin 78 attached to the inner peripheral side of the case 76. The coil 77 is electrically connected to an ignition switch (not shown). The movable portion 75 is provided with a movable iron core 79 to which the switch shaft 45 is attached. A gear plunger 81 is attached to the inner peripheral side of the movable iron core 79. A switch return spring 86 is attached to the outer peripheral side (lower end side in the figure) of the movable iron core 79. The other end side of the switch return spring 86 is in contact with the gear cover 24, and the movable iron core 79 is urged to the right.

  A bracket plate 82 is further fixed to the inner periphery of the movable iron core 79. One end of a plunger spring 83 is fixed to the bracket plate 82 by caulking. The other end of the plunger spring 83 is in contact with the gear plunger 81 when the ignition key switch is OFF (in the upper half state of FIG. 1). The gear plunger 81 is attached to the left by the plunger spring 83. It is energized. The gear plunger 81 is attached to the drive shaft 4 so as to be movable in the axial direction, and a sliding iron core 84 is interposed between the inner peripheral surface of the movable iron core 79.

  The gear cover 24 is formed by aluminum die casting, and the left end side of the drive shaft 4 is rotatably supported by a left end portion of the gear cover 24 via a metal bearing 85. A clutch stopper 67 made of a synthetic resin (for example, glass fiber reinforced polyamide), a case 76 and the like are fixed in the gear cover 24. Further, a motor housing 21 and an end cover 23 are fixed to the right end surface side of the gear cover 24 by a set bolt 25.

  Next, the engine starting operation using such an engine starting device 1 will be described. First, when the ignition key switch of the automobile is OFF, the clutch outer 56 is in contact with the clutch stopper 67 by the biasing force of the gear return spring 65 as shown in the upper half of FIG. At this time, the switch plate 43 is separated from the conductive plate 41, and power supply to the motor 2 is not performed. Further, the pinion gear 6 is in the right disengagement position and is not engaged with the ring gear 8.

  On the other hand, when the ignition key switch is turned on, first, a current flows through the coil 77 and an attractive force is generated in the magnet switch 7. When the coil 77 is excited, a magnetic path passing through the case 76 and the bobbin 78 is formed, and the movable iron core 79 is attracted to the left. When the movable iron core 79 moves to the left against the urging force of the switch return spring 86, the switch shaft 45 also moves to the left, the switch plate 43 contacts the conductive plate 41, and the contact is closed. As a result, the power supply terminal 44 and the brush 38 are electrically connected, power is supplied to the commutator 34, the motor 2 operates, and the armature 22 rotates.

  Here, in the conventional engine starter as shown in FIG. 2, the distance between the switch plate and the conductive plate is set to be approximately the same as the distance between the pinion gear and the ring gear (for example, both are about 3 mm). ) After the two plates are in contact with each other and the motor is operated, or almost simultaneously with the operation, the pinion gear meshes with the ring gear. For this reason, the pinion gear jumps into the ring gear while rotating, and there is a problem that a large impact force is generated when the two gears are engaged as described above.

  On the other hand, in the engine starting device 1 according to the present invention, the switch stroke Ls of the switch unit 42 is set to be larger than the moving distance Lp until the pinion gear 6 contacts the ring gear 8 (Ls = for example, 6 mm> Lp = For example, 3mm). That is, here, the operating distance of the electrical contacts when the switch unit 42 changes from the OFF state to the ON state (the distance between the switch plate 43 and the conductive plate 41) is the same as the pinion gear 6 when the switch unit 42 is in the OFF state. The distance is larger than the distance between the ring gear 8 and the motor 2 is operated after the both gears 6 and 8 come into contact with each other.

  That is, in the engine starting device 1, the switch portion 42 is set not to be closed until the pinion gear 6 contacts the ring gear 8, and the pinion gear 6 meshes with the ring gear 8 before being driven to rotate by the motor 2. And after the pinion gear 6 and the ring gear 8 contact | abut, the switch part 42 is closed and the motor 2 act | operates and the pinion gear 6 rotates. Therefore, the pinion gear 6 can be meshed with the ring gear 8 without being driven to rotate by the motor 2, and the pinion gear 6 and the ring gear 8 can be meshed smoothly without generating a large impact force. For this reason, wear of both the gears 6 and 8 due to the impact at the time of meshing is suppressed, and the durability of the device is improved as compared with the conventional engine starting device. Moreover, the impact sound at the time of meshing is suppressed, and the gear impact sound at the time of starting the engine is also reduced.

  Therefore, in the engine starter 1, when the coil 77 is excited and the movable iron core 79 is attracted to the left, the bracket plate 82 moves to the left, and the plunger spring 83 is first compressed. The repulsive force of the plunger spring 83 at this time is set to be larger than the repulsive force of the gear return spring 65, and the gear plunger 81 is moved to the left by the suction force applied to the sliding iron core 84 and the plunger spring 83. Pressed. As a result, the clutch outer 56 moves on the helical spline portion 61 along the axial direction, and the pinion gear 6 also moves to the left along with it and eventually meshes with the ring gear 8. That is, the magnet switch 7 acts as an electromagnetic push-in mechanism, and the pinion gear 6 is engaged with the ring gear 8.

  After the pinion gear 6 and the ring gear 8 mesh with each other in this way, the switch plate 43 and the conductive plate 41 come into contact with each other, and the motor 2 operates. When the motor 2 operates and the armature 22 rotates, the drive shaft 4 rotates through the planetary gear mechanism 11. As the drive shaft 4 rotates, the clutch outer 56 attached to the helical spline portion 61 also rotates. The helical spline portion 61 has a twisting direction set in consideration of the rotational direction of the drive shaft 4. When the rotational speed of the clutch outer 56 increases, the inertial mass causes the clutch outer 56 to move along the helical spline portion 61. Move to the left.

  When the clutch outer 56 jumps to the left along with the rotation of the motor 2, the pinion gear 6 also moves to the left together with the clutch outer 56, and the pinion gear 6 engages with the ring gear 8 more deeply. As a result, the pinion gear 6 moves to the operating position as shown in the lower half of FIG. 1, the rotation of the motor 2 is transmitted to the ring gear 8, and the ring gear 8 rotates. The ring gear 8 is connected to the crankshaft of the engine. As the ring gear 8 rotates, the crankshaft rotates and the engine is started. When the engine is started, the pinion gear 6 is rotated at a high speed by the ring gear 8, but the rotation is not transmitted to the motor 2 side due to the action of the overrunning clutch 5.

  When the clutch outer 56 moves leftward, the gear return spring 65 is also pushed by the clutch outer 56 and contracted. Further, the plunger spring 83 pushes the gear plunger 81 to the left, and is released when the pinion gear 6 and the ring gear 8 are completely engaged with each other, so that a natural length state is obtained. Therefore, a slight gap is generated between the gear plunger 81 and the plunger spring 83 in contact with the clutch outer 56 as in the lower half state of FIG.

  When the engine is started, the pinion gear 6 is rotated at a high speed, and the overrunning clutch 5 is rotated in the idling direction. When the overrunning clutch 5 is rotated in the idling direction, idling torque is generated in the clutch, and a rotational force called cutting torque acts on the clutch outer 56. Due to this rotational force, a rightward thrust force is generated in the clutch outer 56 via the helical spline portion 61, and the clutch outer 56 may move to the right and the pinion gear 6 may be disengaged from the ring gear 8. Therefore, in the engine starting device 1, the gear plunger 81 is held at the moving left end position (see the lower half of FIG. 1) by the electromagnetic attractive force applied to the sliding iron core 84, and the movement of the clutch outer 56 is restricted. Thereby, the rightward movement of the pinion gear 6 is restricted, and the detachment of the pinion gear 6 is suppressed.

  On the other hand, when the engine is started and the ignition key switch is turned off, the energization to the magnet switch 7 is stopped and the attractive force disappears. Then, the bracket plate 82 is pushed rightward by the urging force of the switch return spring 86, and the movable iron core 79 that has been held leftward by the suction force by the bobbin 78 is moved rightward. When the movable iron core 79 moves to the right, the switch shaft 45 also moves to the right, the switch plate 43 is separated from the conductive plate 41, and the contact is opened. Thereby, the power supply to the motor 2 is interrupted, the rotation of the drive shaft 4 is stopped, and the rotation of the clutch outer 56 is also stopped.

  When the rotation of the clutch outer 56 stops, the moving force in the axial direction due to the inertia mass disappears. For this reason, the clutch outer 56 moves to the right from the operating position to the stationary position along the helical spline portion 61 by the biasing force of the gear return spring 65 that has been compressed. At this time, the gear plunger 81 is also pushed by the clutch outer 56 to be in the upper half of FIG. The urging force of the gear return spring 65 is set to be larger than the urging force of the plunger spring 83 at this time. When the clutch outer 56 moves to the right, the pinion gear 6 also moves to the right, disengages from the ring gear 8, and returns to the upper half state of FIG.

  It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

It is sectional drawing which shows the structure of the engine starting apparatus which is one Example of this invention, the upper side from the centerline has shown the stationary state, and the lower side has shown the energized state. It is sectional drawing which shows the structure of the conventional engine starter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine starter 2 Electric motor 3 Reduction gear 4 Drive shaft 5 Overrunning clutch 6 Pinion gear 7 Magnet switch 8 Ring gear 11 Planetary gear mechanism 21 Motor housing 22 Armature 23 End cover 24 Gear cover 25 Set bolt 26 Magnet 27 Motor shaft 28 Armature core 29 Armature coil 31 Metal bearing 32 Bearing portion 33 Metal bearing 34 Commutator 35 Commutator piece 36 Brush holder 37 Brush housing portion 38 Brush 41 Conductive plate 41a First plate 41b Second plate 41c Insulating portion 42 Switch portion 43 Switch plate 44 Power supply terminal 45 Switch Shaft 46 Internal gear unit 47 Drive plate unit 48 Internal ring gear 49 Meta Bearing 51 Planetary gear 52 Base plate 53 Support pin 54 Metal bearing 55 Sun gear 56 Clutch outer 56a Boss part 56b Clutch part 57 Clutch inner 58 Roller 61 Helical spline part 62 Spline part 63 Stopper 64 Circlip 65 Gear return spring 66 Inner end wall 67 Clutch stopper 68 Clutch cover 69 Clutch washer 71 Shaft hole 72 Pinion gear metal 73 Spring accommodating portion 74 Fixed portion 75 Movable portion 76 Case 77 Coil 78 Bobbin 79 Movable iron core 81 Gear plunger 82 Bracket plate 83 Plunger spring 84 Sliding iron core 85 Metal bearing 86 Switch return Spring Lp Movement distance Ls until the pinion gear contacts the ring gear Ls Distance of
101 engine starter
102 Ring gear
103 Pinion gear
104 Electric motor
105 Reduction gear
106 Output shaft
107 Clutch outer
108 Clutch inner
109 Overrunning clutch
111 Helical spline section
112 Laura

Claims (4)

A pinion gear that meshes with the ring gear of the engine by moving in the axial direction on the drive shaft, a motor for rotationally driving the pinion gear, and coaxially arranged with the drive shaft to turn on / off the ignition switch of the engine An engine starter comprising a magnet switch that operates together with a switch unit that is operated by the magnet switch and controls the operation of the motor, wherein the pinion gear moves in the axial direction in conjunction with the operation of the switch unit. ,
The switch part is characterized in that the operating distance of the electrical contact when the switch part is turned from the OFF state to the ON state is larger than the distance between the pinion gear and the ring gear when the switch part is in the OFF state. Engine starting device. The engine starting device according to claim 1, wherein the electrical contact of the switch portion is
A conductive plate comprising: a first plate connected to the motor side; and a second plate connected to the power supply side and separated from the first plate by an insulating portion;
A switch plate disposed at a distance from the conductive plate and contacting the first and second plates to electrically connect the insulating portion to electrically connect the motor side and the power source side; An engine starter comprising: The engine starting device according to claim 2,
The switch plate contacts and separates from the conductive plate in conjunction with the operation of the magnet switch,
The engine starter characterized in that the pinion gear moves in the axial direction in conjunction with the operation of the magnet switch. The engine starter according to claim 2, wherein the magnet switch includes:
A fixed portion comprising a coil electrically connected to the ignition switch, and a bobbin in which the coil is accommodated;
A movable part provided with a movable iron core provided to be movable relative to the fixed part and connected to the switch plate;
A gear plunger provided on the inner peripheral side of the movable iron core and in contact with the movable iron core via a sliding iron core on the drive shaft, and a gear plunger disposed on a helical spline portion formed on the drive shaft. An overrunning clutch having a clutch outer abutting on one end of the shaft and a clutch inner on which the pinion gear is formed is movably provided in the axial direction.
When the ignition switch is turned on, the coil is excited accordingly, and the movable part and the gear plunger move in the axial direction, and the movement of the gear plunger causes the overrunning clutch to pivot on the helical spline part. As the pinion gear moves in the axial direction, the pinion gear moves in the axial direction. At this time, the pinion gear contacts the ring gear before the electrical contact of the switch portion is closed.

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