JP2017082720A - Starting device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a starting device for an internal combustion engine that can facilitate work efficiency for attaching a movement regulation member for regulating movement of a pinion gear to a ring gear side caused by an elastic member while inhibiting dropping of the movement regulation member due to rotational centrifugal force and can suppress an increase in the number of components.SOLUTION: In a starting device for an internal combustion engine, an energization pinion portion includes: a pinion member having a pinion tooth portion and a pinion extension portion; an intermediate connection member having a spline coupling portion and an expanded inner diameter portion; an elastic member for energizing the pinion member to an axial first side relative to the intermediate connection member; and a movement regulation member fitted into the pinion extension portion and abutting on a step surface between the spline coupling portion and the expanded inner diameter portion. The axial length of the expanded inner diameter portion is made shorter than the movable width of the pinion member in the state where the energization pinion portion is separated from a movement body base portion.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an internal combustion engine starter having a pinion gear that moves in an axial direction.

  A starter for an internal combustion engine meshes a pinion gear with a ring gear of the internal combustion engine, transmits the rotational driving force of the electric motor to the internal combustion engine, and starts the internal combustion engine. In the techniques of Patent Document 1 and Patent Document 2, an elastic member is provided on the moving body of the pinion gear, and the engagement between the pinion gear and the ring gear is improved by the elastic force of the elastic member.

JP 2006-161590 A Special table 2013-515910 gazette

  However, in the technique of Patent Document 1, a pinion stopper 26 for restricting movement of the pinion gear toward the ring gear by the elastic member is fitted to the outer peripheral surface of the inner tube 23 that rotates integrally with the output shaft. For this reason, depending on the material and shape of the pinion stopper 26, the diameter of the pinion stopper 26 is increased by the rotational centrifugal force of the output shaft, and the reliability of the coupling with the inner tube 23 may be reduced.

  In the technique of Patent Document 2, a position fixing member 76 for restricting the movement of the pinion gear toward the ring gear by the elastic member is inserted into the mounting position on the radially inner side of the hollow shaft 34. Therefore, the radial distance between the hollow shaft 34 and the mounting position of the position fixing member 76 is widened to facilitate the insertion of the position fixing member 76. On the other hand, in the technique of Patent Document 2, in order to prevent the position fixing member 76 from falling out of the mounting position due to the diameter of the position fixing member 76 being increased by the rotational centrifugal force of the output shaft, the position fixing member 76 and the hollow shaft 34 are prevented. A bush member is fitted into the gap. However, in the technique of Patent Document 2, a separate bushing member is required, and there is a problem that the manufacturing cost increases.

  Therefore, an internal combustion engine that can facilitate the assembly work of the movement restricting member and suppress the increase in the number of parts while suppressing the falling of the movement restricting member that restricts the movement of the pinion gear toward the ring gear by the elastic member due to the rotational centrifugal force. An engine starter is desired.

  An internal combustion engine starter according to the present invention includes an electric motor, an output shaft to which the rotational driving force of the electric motor is transmitted, a moving body base that is helically splined to the output shaft, and a one-way clutch. A pinion moving body portion coupled to the moving body base portion and having an urging pinion portion that urges a pinion gear to an axial first side that is one side of the axial direction by an elastic member; and The electric motor moves the pinion moving body portion to the first axial direction when energized, and moves the pinion moving body portion to the second axial side opposite to the first axial direction when de-energized. An internal combustion engine starter comprising: an extruding mechanism, wherein the urging pinion portion is a cylindrical member disposed radially outside the output shaft, and formed by external teeth of the pinion gear Pinion teeth and A pinion member having a pinion extending portion extending from the pinion tooth portion to the second axial side, and a cylindrical member disposed radially outside the pinion member and constituting an inner ring of the one-way clutch. A spline coupling portion that is spline coupled to the pinion extension portion, an intermediate coupling member that extends from the spline coupling portion to the second axial side, and has an enlarged inner diameter portion that has a larger inner diameter than the spline coupling portion, An elastic member that urges the pinion member toward the first axial direction with respect to the intermediate connecting member; and an annular member that is fitted in a circumferentially extending recess formed on the outer peripheral surface of the pinion extension. The intermediate connecting member is disposed on the second axial side of the step surface between the spline coupling portion and the enlarged inner diameter portion, the inner diameter of which changes, and comes into contact with the step surface And a movement restricting member for restricting movement of the pinion member toward the first side in the axial direction, and the axial length of the enlarged inner diameter portion disassembles the biasing pinion portion from the movable body base portion. In this state, the pinion member relative to the intermediate connecting member is shorter than the movable width of the pinion member toward the second axial direction.

With the internal combustion engine starter according to the present invention, in a state where the urging pinion portion is disassembled from the movable body base portion, the elastic member is contracted, and the pinion member is moved axially by the movable width relative to the intermediate connecting member. When moved to the two sides, the enlarged inner diameter portion is not disposed on the radially outer side of the concave portion formed on the outer peripheral surface of the pinion extension portion. Therefore, the annular movement restricting member can be fitted into the recess from the radially outer side, and the assembly workability of the movement restricting member can be facilitated.
On the other hand, in the state where the biasing pinion part is assembled on the movable body base part side and the elastic member is extended, the enlarged inner diameter part of the intermediate coupling member is disposed on the radially outer side of the movement restricting member. The expansion of the diameter of the movement restricting member can be suppressed, and the dropout of the movement restricting member can be suppressed. Further, since the enlarged inner diameter portion is a part of the intermediate connecting member that supports the second axial side of the elastic member and constitutes the inner ring of the one-way clutch, an increase in the number of parts can be suppressed.

1 is a partial cross-sectional view of an internal combustion engine starter according to Embodiment 1. FIG. It is sectional drawing of the urging | biasing pinion part when the elastic member is extended in the state which decomposed | disassembled the urging | biasing pinion part based on Embodiment 1 from the mobile body base part. It is sectional drawing of the urging | biasing pinion part at the time of shrinking | contracting an elastic member in the state which decomposed | disassembled the urging | biasing pinion part based on Embodiment 1 from a mobile body base part. FIG. 4 is a cross-sectional view of an urging pinion portion when a movement restricting member is attached and detached in the state of FIG. 3 according to the first embodiment. It is sectional drawing of the pinion moving body part in the state which assembled | attached the urging | biasing pinion part to the moving body base part based on Embodiment 1. FIG.

1. Embodiment 1
An internal combustion engine starter 1 according to Embodiment 1 (hereinafter simply referred to as starter 1) will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view of the starting device 1 cut along a plane passing through the rotational axis H of the electric motor 3. Although details of each part will be described later, FIGS. 2 to 4 are sectional views of the urging pinion part 30 in a state in which the urging pinion part 30 is disassembled from the movable body base part 25. FIG. 5 is a cross-sectional view of the pinion moving body portion 20 in a state where the biasing pinion portion 30 is assembled to the moving body base portion 25 via the one-way clutch 31.

  A direction parallel to the rotation axis H of the electric motor 3 is defined as an axial direction X, one side of the axial direction X is defined as an axial first side X1 (the right side in FIGS. 1 to 5), and the axial direction in the axial direction X The side opposite to the first side X1 is defined as the axial second side X2 (left side in FIGS. 1 to 5).

  The starter 1 includes an electric motor 3, an output shaft 7 to which the rotational driving force of the electric motor 3 is transmitted, a pinion moving body portion 20 that is helically splined to the output shaft 7 and includes a pinion gear 21 and a one-way clutch 31. And an electric pusher mechanism 4 that moves the pinion moving body 20 to the axial first side X1 when energized and moves the pinion moving body 20 to the axial second side X2 when de-energized. Hereinafter, each part will be described in detail.

  The electric motor 3 includes a cylindrical stator 40 fixed to the inner peripheral surface of the motor case 37, and a cylindrical rotor 41 that is disposed on the radial inner side of the stator 40 and is rotatably supported by a bearing. This is an electric motor. As the electric motor 3, a direct-current winding motor is used. The stator 40 is provided with a permanent magnet, and the rotor 41 is provided with a winding and a commutator. The motor case 37 is formed in a bottomed cylindrical shape that opens to the first axial side X1.

  A rotational driving force of the electric motor 3 is transmitted to the output shaft 7. In the present embodiment, the rotor shaft 42 that is the rotation shaft of the rotor 41 is connected to the output shaft 7 via the speed reducer 50. The electric motor 3, the speed reducer 50, and the output shaft 7 are arranged on the same axis as the rotation axis H, the speed reducer 50 is arranged on the first axial side X <b> 1 of the electric motor 3, and An output shaft 7 is disposed on one side X1. The speed reducer 50 is a single pinion type planetary gear mechanism, and includes a carrier 53 that supports a plurality of planetary gears 52, an externally toothed sun gear 51 that meshes with the planetary gears 52 from the inside in the radial direction, and a diameter of the planetary gear 52. And an internal ring gear 54 meshing from the outside in the direction. A sun gear 51 is formed on the rotor shaft 42, the carrier 53 is connected to the output shaft 7, and the ring gear 54 is fixed to the inner peripheral surface of the motor case 37.

  The output shaft 7 is formed in a cylindrical shape extending on the rotation axis H from the speed reducer 50 to the first axial side X1. The end of the output shaft 7 on the second axial side X2 is connected to the carrier 53, and the end of the output shaft 7 on the first axial side X1 is rotatably supported with respect to the front housing 38 via a bearing. Has been. The front housing 38 is a cover member that accommodates a portion on the first axial direction side X1 of the starting device 1 (the output shaft 7, the pinion moving body portion 20, the shift lever 66, and the like) inside. The output shaft 7 supports the pinion moving body 20 having a cylindrical shape from the inside in the radial direction.

  A portion on the first axial side X1 of the carrier connecting portion in the output shaft 7 is a cylindrical output shaft spline connecting portion 45 having a helical spline groove for helical spline connection formed on the outer peripheral surface. The helical spline grooves are a plurality of spiral grooves extending obliquely with respect to the axial direction X, and the plurality of spiral grooves are formed at equal intervals in the circumferential direction over the entire circumference.

  A portion on the first axial side X1 of the output shaft spline coupling portion 45 in the output shaft 7 is a moving body support portion 47 that supports a biasing pinion portion 30 of the pinion moving body portion 20 described later from the inside in the radial direction. . The moving body support portion 47 is formed in a columnar shape having a smaller diameter than the output shaft spline coupling portion 45. The urging pinion unit 30 moves in the axial direction X along the moving body support unit 47. A cylindrical stopper 8 that restricts the movement of the pinion moving body portion 20 (pinion gear 21) to the axial first side X1 is attached to the end portion of the moving body support portion 47 on the first axial side X1. .

The electric pushing mechanism 4 is an electric actuator that moves the pinion moving body portion 20 to the first axial side X1 when energized and moves the pinion moving body portion 20 to the second axial side X2 when not energized. In the present embodiment, the electric push-out mechanism 4 is disposed on the radially outer side of the electric motor 3. The electric push-out mechanism 4 includes a plunger 62 made of a magnetic material that can move in the axial direction X, a plunger spring 63 that urges the plunger 62 toward the axial first side X1, and the plunger 62 that moves toward the axial second side X2 when energized. And a shift lever 66 that reverses the movement of the plunger 62 in the axial direction X between the first side X1 and the second side X2 and transmits it to the pinion moving body portion 20. The shift lever 66 is a rod-shaped member that extends in the radial direction and is rotatable about a fulcrum portion 65 provided in the middle. The fork-shaped fork-shaped radially outer end is engaged with the plunger 62. The bifurcated fork-shaped radially inner end is engaged with the pinion moving body 20 (the engaging portion 36 of the moving body base 25). For example, when the start switch is turned on by the user, electric power is supplied to the electromagnetic coil 64 from a DC power source such as a battery and the energized state is established. When the start switch is turned off, the power supply to the electromagnetic coil 64 is stopped. Then, it becomes a non-energized state. In the present embodiment, the plunger 62 is made of a magnetic material and is inserted into the radially inner side of the plunger main body 68 and the bottomed cylindrical plunger main body 68 that is open on the first axial side X1. A cylindrical plunger pin 69 and a pin spring 61 that urges the plunger pin 69 toward the second axial direction X2 with respect to the plunger main body 68 are provided. The end of the plunger pin 69 that protrudes from the plunger main body portion 68 to the first axial side X1 is engaged with the shift lever 66.

  In the present embodiment, the electric push-out mechanism 4 includes a motor switch 67 that turns on and off the supply of DC power to the electric motor 3. The open / close contact of the motor switch 67 is disposed on the second axial side X2 of the plunger 62, and the amount of movement of the plunger 62 (plunger main body portion 68) to the second axial side X2 is a predetermined energized movement. When the amount exceeds the limit, the switching contact is configured to close.

  The pinion moving body part 20 is connected to the moving body base part 25 via a moving body base part 25 that is helically spline-coupled to the output shaft 7 and a one-way clutch 31, and the pinion gear 21 is connected to the first pin in the axial direction by an elastic member 22. An urging pinion portion 30 that urges the side X1 is provided. The movable body base portion 25 includes a helical spline coupling portion 35 (hereinafter referred to as a movable body spline coupling portion 35) and an engagement portion 36 with the electric push-out mechanism 4. The urging pinion unit 30 includes an elastic urging mechanism that urges the pinion gear 21 and the pinion gear 21 to the first axial side X <b> 1 by the elastic member 22.

  When the starting device 1 is assembled to the internal combustion engine, the ring gear 9 of the internal combustion engine is arranged on the first axial side X1 of the pinion gear 21. The pinion gear 21 is an external gear. The ring gear 9 is an external gear formed on the outer peripheral surface of the flywheel of the crankshaft of the internal combustion engine. When electric power is supplied to the electric pushing mechanism 4, the pinion gear 21 is moved to the first axial side X1 by the electric pushing mechanism 4 and meshes with the ring gear 9 of the internal combustion engine. On the other hand, when electric power is not supplied to the electric pushing mechanism 4, the pinion gear 21 is moved to the second axial side X2 by the electric pushing mechanism 4, and the meshing with the ring gear 9 of the internal combustion engine is released. Therefore, the first axial side X1 is the meshing side with the ring gear 9, and the second axial direction X2 is the non-meshing side with the ring gear 9.

  However, depending on the relative rotational angle state of the pinion gear 21 and the ring gear 9, the crests and troughs of the mutual gears do not coincide. Therefore, when the pinion gear 21 is moved to the first axial side X1, the pinion gear 21 does not mesh with the ring gear 9, and the end surface of the first axial side X1 of the pinion gear 21 is on the second axial side X2 of the ring gear 9. There is a case where it contacts the end face. In this case, an elastic biasing mechanism and a pin spring 61 of the plunger 62 are provided to rotate the pinion gear 21 and mesh with the ring gear 9. Specifically, after the end surface of the pinion gear 21 abuts on the end surface of the ring gear 9, the elastic member 22 and the pin spring 61 contract, whereby the plunger main body 68 continues to move to the second axial side X2, and the motor switch 67 is turned on. Then, electric power is supplied to the electric motor 3, the electric motor 3 starts to rotate, and a phase in which the pinion gear 21 and the ring gear 9 can mesh with each other is obtained. When the phases coincide, the pinion gear 21 and the pinion moving body 20 are further moved to the first axial direction X1 by the extension of the elastic member 22 and the pin spring 61, and the pinion gear 21 meshes with the ring gear 21.

  The one-way clutch 31 is a clutch mechanism that transmits the rotational force only in the direction in which the rotational force is transmitted from the output shaft 7 to the ring gear 9 of the internal combustion engine, and is an overrun prevention mechanism of the starter 1. That is, the one-way clutch 31 is connected when the rotation of the pinion gear 21 is equal to or higher than the rotation of the ring gear 9 of the internal combustion engine, and the rotation of the ring gear 9 becomes higher than the rotation of the pinion gear 21 due to the start of combustion of the internal combustion engine. Decouple to. In the present embodiment, the one-way clutch 31 has an outer ring 10, an inner ring 11, and a plurality of engaging members 12 disposed between the outer ring 10 and the inner ring 11. The engaging member 12 engages with the outer ring 10 and the inner ring 11 when the rotation speed of the outer ring 10 is equal to or higher than the rotation speed of the inner ring 11, and when the rotation speed of the outer ring 10 is lower than the rotation speed of the inner ring 11, The engagement with the inner ring 11 is released. In this example, the cam type one-way clutch 31 is used, and the engaging member 12 is a cylindrical roller, and is provided with a spring (not shown) that urges each roller to one side in the circumferential direction. Yes.

  The movable body spline coupling portion 35 of the movable body base portion 25 is disposed radially outside the output shaft spline coupling portion 45 of the output shaft 7 and is formed in a cylindrical shape. A helical spline groove that meshes with a helical spline groove formed on the output shaft 7 is formed on the inner peripheral surface of the moving body spline coupling portion 35. The movable body base portion 25 includes an annular plate-shaped flange portion 71 that extends radially outward from the end portion on the first axial side X1 of the movable body spline coupling portion 35, and a radially outer end portion of the flange portion 71. And a cylindrical basic cylindrical portion 72 extending on the first axial direction side X1. The basic cylindrical portion 72 is the outer ring 10 of the one-way clutch 31, and the roller 12 is disposed on the radially inner side of the basic cylindrical portion 72. The diameter of the inner peripheral surface of the basic cylindrical portion 72 is different in each circumferential portion in order to engage the roller 12.

  A connection member 74 for connecting the urging pinion portion 30 (connection plate 80) is fitted and snap-engaged with the outer peripheral surface of the basic cylindrical portion 72. The connecting member 74 is fitted to the outer peripheral surface of the basic cylindrical portion 72 and is snap-engaged, and an annular ring extending radially inward from the end portion of the first axial side X1 of the cylindrical portion. And a plate-like portion. The connecting plate 80 is sandwiched and fixed from both sides in the axial direction by the annular plate-like portion and the basic cylindrical portion 72 of the connecting member 74. By removing the connecting member 74 from the basic cylindrical portion 72, the urging pinion portion 30 can be disassembled from the movable body basic portion 25 as shown in FIGS. On the contrary, as shown in FIGS. 1 and 5, the urging pinion portion 30 can be assembled to the movable body base portion 25 by attaching the connecting member 74 to the basic cylindrical portion 72.

  An annular recess recessed radially inward is formed in the central portion of the outer peripheral surface of the moving body spline coupling portion 35 in the axial direction X, and an annular plate-like lever stop member 73 is fitted in the recess. ing. A bifurcated fork-like end portion of the shift lever 66 is inserted into a cylindrical space between the lever stopper member 73 and the flange portion 71. That is, the lever stopper member 73 and the flange portion 71 form an engaging portion 36 with the electric push-out mechanism 4.

  As shown in FIGS. 1 to 4, the biasing pinion portion 30 includes a pinion member 29, an intermediate connecting member 23, an elastic member 22, and a movement restricting member 24. The pinion member 29 is a cylindrical member disposed on the radially outer side of the output shaft 7, and includes a pinion tooth portion 28 on which external teeth of the pinion gear 21 are formed, and a second axial direction from the pinion tooth portion 28. It has a pinion extension 27 extending to the side X2. The intermediate coupling member 23 is a cylindrical member that is disposed on the radially outer side of the pinion member 29 and constitutes the inner ring 11 of the one-way clutch 31, and is a spline coupling portion 85 that is spline coupled to the pinion extension portion 27, And it has the expansion inner diameter part 32 extended from the said spline coupling | bond part 85 to the axial direction 2nd side X2, and an internal diameter larger than the spline coupling | bond part 85. FIG. The elastic member 22 biases the pinion member 29 toward the first axial side X1 with respect to the intermediate connecting member 23. The movement restricting member 24 is an annular member fitted into a circumferentially extending recess 33 formed on the outer peripheral surface of the pinion extending portion 27, and includes a spline coupling portion 85 and an enlarged inner diameter portion 32 that change in inner diameter. A first axial side of the pinion member 29 with respect to the intermediate connecting member 23 by being disposed on the second axial side X2 of the step surface 34 (hereinafter referred to as the movement restricting step surface 34) and contacting the movement restricting step surface 34. Restrict movement to X1.

  According to this configuration, as shown in FIGS. 1 and 2, in the state where the elastic member 22 is extended, the enlarged inner diameter portion 32 of the intermediate connecting member 23 is arranged on the radially outer side of the movement restricting member 24, and the rotary centrifuge The expansion of the diameter of the movement restricting member 24 due to force is suppressed, and the movement restricting member 24 can be prevented from falling off. Moreover, since the enlarged inner diameter portion 32 is a part of the intermediate connecting member 23 that supports the second axial side X2 of the elastic member 22 and constitutes the inner ring 11 of the one-way clutch 31, an increase in the number of components can be suppressed. When the pinion gear 21 meshes with the ring gear 9, the rotational speed of the electric motor 3 increases, and the rotational centrifugal force increases, the elastic member 22 is extended, so that it is reliably expanded radially outward of the movement restricting member 24. An inner diameter portion 32 is disposed.

  The inner peripheral surface of the pinion member 29 is formed in a cylindrical shape. Two cylindrical bush members 81 are fitted and fixed to the inner peripheral surface of the pinion member 29. The inner peripheral surface of the pinion member 29 is slidably in contact with the outer peripheral surface of the movable body support portion 47 of the output shaft 7 via the bush member 81. A portion of the pinion member 29 on the first axial direction side X <b> 1 is a pinion tooth portion 28, and outer teeth of the pinion gear 21 are formed on the outer peripheral portion of the pinion tooth portion 28. The outer diameter of the pinion tooth portion 28 is made larger than the outer diameter of the pinion extension portion 27. An annular planar stepped surface 83 (hereinafter referred to as the axial second side X2) is provided at the end of the second axial side X2 of the pinion tooth portion 28 that protrudes radially outward from the pinion extending portion 27. , Referred to as a pinion step surface 83). The pinion step surface 83 is a support surface that supports the elastic member 22 from the first axial side X1. In addition, the external tooth of the pinion gear 21 is not formed in the edge part of the axial direction 2nd side X2 in the protrusion part of the radial direction outer side of the pinion tooth part 28. FIG.

  A portion on the second axial side X2 of the pinion member 29 is a cylindrical pinion extending portion 27. The outer peripheral surface of the pinion extending portion 27 is for spline coupling that can slide in the axial direction X. A spline groove 82 is formed. The spline grooves 82 are a plurality of grooves extending in the axial direction X, and the plurality of grooves are formed at equal intervals in the circumferential direction over the entire circumference. In this example, the spline groove 82 is a sawtooth groove. The spline groove 82 is formed up to the end surface on the second axial side X2 of the pinion extending portion 27.

  On the outer peripheral surface of the pinion extending portion 27, a recess 33 is formed that is recessed inward in the radial direction and extends in the circumferential direction. The recess 33 is formed in the vicinity of the end of the second axial side X2 of the pinion extension 27 and extends over the entire circumference. In the recess 33, the crest of the spline groove 82 is cut off. An annular movement restricting member 24 is fitted in the recess 33. The movement restricting member 24 is a C-shaped snap ring, and is an annular member having a part cut off in the circumferential direction. When the movement restricting member 24 is fitted into the recess 33, the diameter of the movement restricting member 24 is enlarged.

  The intermediate connecting member 23 includes a cylindrical spline coupling portion 85. A spline groove 84 that meshes with a spline groove 82 formed on the outer peripheral surface of the pinion extending portion 27 is formed on the inner peripheral surface of the spline coupling portion 85. The spline grooves 84 of the spline coupling portion 85 are a plurality of grooves extending in the axial direction X. At the end of the spline coupling portion 85 that protrudes radially inward from the enlarged inner diameter portion 32, an annular planar movement restriction step surface 34 that faces the second axial side X <b> 2 is provided. Is formed. The movement restricting step surface 34 is disposed on the first axial side X1 of the movement restricting member 24. When the movement restricting member 24 moves to the first axial side X1 by the biasing force of the elastic member 22, the movement restricting step surface 34 is restricted. Abutting on the member 24, the movement of the movement restricting member 24 to the first axial direction X1 is restricted. The end surface on the first axial side X1 of the spline coupling portion 85 is a support surface that supports the elastic member 22 from the second axial side X2.

  A cylindrical plate recess 86 that is recessed radially inward and extending in the circumferential direction is formed on the outer peripheral surface of the spline coupling portion 85, and the above-described annular plate-like shape is formed in the plate recess 86. The radially inner end of the connection plate 80 is fitted. A gap is provided between the plate recess 86 and the connection plate 80 so as to be relatively rotatable.

  The enlarged inner diameter portion 32 extends from the end on the second axial side X2 of the spline coupling portion 85 to the second axial side X2, and is formed in a cylindrical shape whose inner diameter is larger than that of the spline coupling portion 85. The portion of the outer peripheral surface of the spline coupling portion 85 on the second axial side X2 from the plate recess 86 and the outer peripheral surface of the enlarged inner diameter portion 32 are formed in a cylindrical shape with the same diameter, and the inner ring 11 of the one-way clutch 31. This constitutes the outer peripheral surface.

  The intermediate connecting member 23 includes a cylindrical spring cover portion 87 that extends radially outward from the end portion of the spline coupling portion 85 on the first axial side X1 and then extends to the first axial side X1. . The spring cover portion 87 is a protective cover that covers the radially outer side of the elastic member 22. The inner diameter of the spring cover portion 87 is slightly larger than the outer diameter of the pinion tooth portion 28. Therefore, as shown in FIG. 3, when the elastic member 22 is contracted, the spring cover portion 87 is disposed on the radially outer side of the pinion tooth portion 28 and does not contact the pinion step surface 83 of the pinion tooth portion 28. . Therefore, as shown in FIG. 2, the spring cover portion 87 can be extended to the axial first side X <b> 1 to the axial position of the pinion stepped surface 83 of the pinion tooth portion 28 with the elastic member 22 extending most. It is possible to cover and protect the radially outer side of the entire elastic member 22.

  The elastic member 22 is a coil spring. The elastic member 22 is between the axial direction between the end surface on the first axial side X1 of the spline coupling portion 85 and the pinion step surface 83 of the pinion tooth portion 28, and the outer peripheral surface of the pinion extension portion 27 and the spring cover portion. It arrange | positions in the cylindrical space between radial directions with the 87 inner peripheral surface. The elastic member 22 biases the pinion step surface 83 of the pinion tooth portion 28 toward the first axial side X1 with respect to the end surface of the spline coupling portion 85 on the first axial side X1.

  As shown in FIGS. 1 and 2, when the movement regulating step surface 34 is in contact with the movement regulating member 24, the movement amount of the pinion member 29 relative to the intermediate coupling member 23 to the first axial side X <b> 1 is maximized. The elastic member 22 is in the maximum extended state in which it has extended most. In this maximum extended state, the enlarged inner diameter portion 32 is disposed on the radially outer side of the recess 33 of the pinion extension portion 27, so that it is difficult to attach and detach the movement restricting member 24 to the recess 33 from the radially outer side.

  Therefore, in order to facilitate the attachment / detachment of the movement restricting member 24, the elastic member 22 is contracted in the state in which the biasing pinion portion 30 is disassembled from the movable body base portion 25 as shown in FIGS. In the minimum extension state in which the pinion member 29 is moved most to the axial second side X2 with respect to the connecting member 23, the enlarged inner diameter portion 32 is not disposed on the radially outer side of the concave portion 33 of the pinion extension portion 27. ing.

  Specifically, as shown in FIG. 3, the length B in the axial direction X of the enlarged inner diameter portion 32 is the pinion member with respect to the intermediate coupling member 23 in a state where the urging pinion portion 30 is disassembled from the movable body base portion 25. 29 is made shorter than the movable width D to the second axial side X2. The movable width D is a change width (= A−) from the axial length A of the elastic member 22 in the maximum extended state shown in FIG. 2 to the axial length C of the elastic member 22 in the minimum extended state shown in FIG. Equal to C). In the present embodiment, the state in which the elastic member 22 is completely compressed is the minimum extension state.

  On the other hand, as shown in FIG. 5, in a state where the urging pinion portion 30 is assembled to the movable body base portion 25 side, the movable body base portion 25 moves toward the second axial side X2 of the pinion member 29 with respect to the intermediate connecting member 23. It is comprised so that movement of may be controlled. That is, in the assembled state of the urging pinion part 30, the amount of movement of the pinion member 29 toward the second axial side X <b> 2 reaches the movable width D of the pinion member 29 in the disassembled state of the urging pinion part 30. The movement of the pinion member 29 is restricted by the movable body base portion 25. Therefore, the movable width G of the pinion member 29 in the axial direction second side X2 with respect to the intermediate coupling member 23 in the assembled state of the biasing pinion part 30 is movable of the pinion member 29 in the disassembled state of the biasing pinion part 30. It is narrower than the width D.

  Specifically, the moving body spline coupling portion 35 of the moving body base portion 25 is disposed on the second axial side X2 of the pinion extending portion 27, and before the elastic member 22 is completely compressed, the pinion The end surface on the second axial side X2 of the extending portion 27 abuts on the end surface on the first axial side X1 of the movable body spline coupling portion 35 to restrict the movement of the pinion member 29. As shown in FIG. 5, the axial width G between the end surface on the second axial side X2 of the pinion extension portion 27 and the end surface on the first axial side X1 of the mobile spline coupling portion 35 in the maximum extension state is as follows. This is the movable width G of the pinion member 29 in the assembled state of the urging pinion portion 30.

  Further, the length B in the axial direction X of the enlarged inner diameter portion 32 is such that the pinion member 29 with respect to the intermediate coupling member 23 due to the movement restriction of the movable body base portion 25 in the state where the biasing pinion portion 30 is assembled to the movable body base portion 25. It is made longer than the movable width G to the axial direction second side X2. According to this configuration, after the urging pinion portion 30 is assembled to the moving body base portion 25, the elastic member 22 contracts and the pinion member 29 is restricted from moving by the moving body base portion 25 in the second axial direction. Even when moved to X 2, the enlarged inner diameter portion 32 is arranged on the radially outer side of the movement restricting member 24. Therefore, after the urging pinion portion 30 is assembled, the state in which the enlarged inner diameter portion 32 is disposed on the radially outer side of the movement restricting member 24 can be maintained regardless of the expansion and contraction of the elastic member 22. Thereby, the expansion of the diameter of the movement restricting member 24 due to the rotational centrifugal force can be suppressed. Moreover, since the movement to the axial direction 2nd side X2 of the pinion member 29 can be controlled using the mobile body base part 25, it can suppress that a number of parts increases for movement control.

  As shown in FIG. 3, the radial gap E between the inner peripheral surface of the enlarged inner diameter portion 32 and the portion of the outer peripheral surface of the pinion extension portion 27 on the second axial side X2 of the recess 33 is a movement restriction. It is narrower than the thickness F of the member 24 in the radial direction. According to this configuration, even if the movement restricting member 24 is pressed against the second axial side X2 by the movement restricting step surface 34, the enlarged inner diameter portion 32 and the pinion extending portion 27 on the axial second side X2 of the recess 33 are provided. Is narrower than the thickness F of the movement restricting member 24, it is possible to prevent the movement restricting member 24 from slipping out of the recess 33 to the second axial side X2. The gap E is a radial difference between the radius of the inner peripheral surface of the enlarged inner diameter portion 32 and the radius of the crest of the spline groove 82 formed on the outer peripheral surface of the pinion extension portion 27.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  The present invention can be suitably used for a starter for an internal combustion engine having a pinion gear that moves in the axial direction.

DESCRIPTION OF SYMBOLS 1 Starter of internal combustion engine, 2 Pinion moving body part, 3 Electric motor, 4 Electric extrusion mechanism, 7 Output shaft, 9 Internal combustion engine ring gear, H Rotating shaft center, B Axial length of enlarged inner diameter part, D The movable width of the pinion member, E The gap between the enlarged inner diameter portion and the pinion extending portion, G The movable width of the pinion member when assembled, X axis direction, X1 axial first side, X2 axial second side 11 Inner ring of one-way clutch, 20 pinion moving body part, 21 pinion gear, 22 elastic member, 23 intermediate connecting member, 24 movement restricting member, 25 moving body base part, 2
7 Pinion extending portion, 28 Pinion tooth portion, 29 Pinion member, 30 Energizing pinion portion, 31 One-way clutch, 32 Enlarged inner diameter portion, 33 Recessed portion, 34 Step surface (movement regulating step surface), 35 Moving body spline coupling portion 36, moving body base part engaging part, 45 output shaft spline coupling part, 47 moving body support part, 50 speed reducer (planetary gear mechanism), 74 connecting member, 80 connecting plate, 82 spline groove, 83 pinion step surface, 85 Spline joint, 87 Spring cover

Claims (3)

An electric motor;
An output shaft to which the rotational driving force of the electric motor is transmitted;
A movable body base portion that is helically splined to the output shaft, and connected to the movable body base portion via a one-way clutch, and a pinion gear is urged to an axial first side that is one side in the axial direction by an elastic member. A pinion moving body having an urging pinion that
Engage with the moving body base, move the pinion moving body portion to the first axial direction when energized, and move the pinion moving body portion in the axial direction opposite to the first axial direction when de-energized An internal combustion engine starter comprising: an electric push-out mechanism that moves to the second side;
The biasing pinion part is
A cylindrical member disposed on the radially outer side of the output shaft, the pinion tooth portion on which the external teeth of the pinion gear are formed, and a pinion extension extending from the pinion tooth portion to the second axial direction A pinion member having a portion;
A cylindrical member that is disposed radially outside the pinion member and constitutes an inner ring of the one-way clutch, the spline coupling portion being spline coupled to the pinion extending portion, and the axial direction from the spline coupling portion An intermediate connecting member extending to the second side and having an enlarged inner diameter portion having an inner diameter larger than the spline coupling portion;
The elastic member for urging the pinion member toward the first axial direction with respect to the intermediate connecting member;
An annular member fitted in a circumferentially extending recess formed on the outer peripheral surface of the pinion extending portion, wherein the stepwise surface of the stepped surface between the spline coupling portion and the enlarged inner diameter portion having a change in inner diameter A movement restricting member that is disposed on two sides and restricts movement of the pinion member relative to the intermediate coupling member to the first axial direction by contacting the step surface;
The axial length of the enlarged inner diameter portion is greater than the movable width of the pinion member toward the second axial direction with respect to the intermediate connecting member in a state in which the biasing pinion portion is disassembled from the movable body base portion. The internal combustion engine starter is also shortened. In the state where the movable body base portion is assembled with the biasing pinion portion on the movable body base portion side, the movement of the pinion member relative to the intermediate connecting member to the second axial side is restricted,
The axial length of the enlarged inner diameter portion is the axial direction of the pinion member relative to the intermediate coupling member due to movement restriction of the movable body base portion in a state where the biasing pinion portion is assembled to the movable body base portion. The starter for an internal combustion engine according to claim 1, wherein the starter is longer than a movable width to the second side.   The radial gap between the inner peripheral surface of the enlarged inner diameter portion and the second axial side portion of the recess in the outer peripheral surface of the pinion extension portion is larger than the radial thickness of the movement restricting member. The starter for an internal combustion engine according to claim 1 or 2, which is also narrow.

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