JP2004324617A - Starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide better assemble of a center case into a housing and restrict the compression of an elastic body to prevent the elastic body from being damaged. <P>SOLUTION: An open part of a housing 17 has a guide opening 17a which guides a center case to a cylinder opening 17b. Since the inside diameter of the guide opening 17a is greater than the inside diameter of the cylinder opening 17b including a recess 17c, the center case can be easily stored inside the cylinder opening 17b. If a relative rotation occurs between the center case and an internal gear, an impact absorption mechanism stops the relative rotation by a first movable protrusion of a resin molded member coming into contact with a second fixed protrusion of the center case. This restricts the compression of the elastic body to avoid the entire compression of the elastic body, thereby preventing early fatigue and damage of the elastic body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reduction starter having a planetary gear reduction device.
[0002]
[Prior art]
Conventionally, as a starter provided with a planetary gear reduction device, for example, Patent Document 1 is known. In this starter, a center case is arranged on the radially outer peripheral side of the internal gear, and an elastic body as a buffer member is arranged between the center case and the internal gear. Further, the center case is housed inside the housing, and the concave portion provided on the outer peripheral surface of the center case and the convex portion provided on the inner peripheral surface of the housing are fitted to each other, and the rotation of the center case is regulated. I have.
Thus, when excessive torque is applied to the internal gear due to rotation fluctuations at the time of engine start or the like, rotation of the internal gear is permitted by compression of the elastic body, and the impact force is absorbed.
[0003]
[Patent Document 1]
JP 62-218658 A
[0004]
[Problems to be solved by the invention]
However, in the starter described above, when assembling the center case in the housing, it is necessary to fit the concave and convex portions of the two from the opening end of the housing, and the fitting length is long in the axial direction. Therefore, it was difficult to attach the center case to the housing.
[0005]
Further, the elastic body disposed between the internal gear and the center case may be completely compressed when excessive torque is applied to the internal gear. That is, the starter has no mechanism for limiting the compression amount of the elastic body (the larger the torque applied to the internal gear, the larger the compression amount of the elastic body). If the elastic body is used repeatedly, the elastic body may be damaged or prematurely fatigued, so that the performance as a cushioning member is significantly reduced.
[0006]
The present invention has been made based on the above circumstances, and its object is to improve the assemblability of the center case inside the housing and to prevent the elastic body from being damaged by limiting the amount of compression of the elastic body. It is to provide a starter that can be used.
[0007]
[Means for Solving the Problems]
(Invention of claim 1)
The starter according to the present invention has a center case having a convex portion that protrudes radially outward from an outer peripheral surface of the starter and a center case that regulates rotation of an internal gear used in the planetary gear reduction device, and has an opening at an end surface on the axial motor side. And a housing in which a cylindrical hole for accommodating the center case is formed inside the opening in the axial direction, and a concave portion corresponding to the convex portion is formed on the inner peripheral surface of the cylindrical hole, When the center case is inserted into the housing from the opening and housed in the cylindrical hole, the protrusion is fitted into the recess, whereby the center case is positioned in the circumferential direction with respect to the housing.
The housing has an opening formed as a guide hole for guiding the center case to the cylindrical hole when the center case is stored in the cylindrical hole.
[0008]
According to the above configuration, when the center case is stored in the cylindrical hole from the opening of the housing, the center case is guided to the cylindrical hole by the guide hole formed in the opening. Easy.
[0009]
(Invention of claim 2)
In the starter according to claim 1,
In the opening of the housing, a guide hole is provided in a tapered shape.
In this case, the center case can be smoothly housed in the cylindrical hole along the tapered shape of the guide hole.
[0010]
(Invention of claim 3)
In the starter according to claim 1,
In the opening of the housing, the inner diameter of the guide hole is provided to be larger than the inner diameter of the cylindrical hole including the concave portion.
On the outer peripheral surface of the center case, a convex portion that fits into the concave portion provided in the cylindrical hole of the housing is formed, so that the inner diameter of the guide hole of the housing is provided to be equal to the inner diameter of the cylindrical hole including the concave portion. When the center case is inserted into the housing, there is a high possibility that the projection of the center case interferes with the periphery of the guide hole, and it becomes difficult to assemble the center case. On the other hand, if the inner diameter of the guide hole is provided larger than the inner diameter of the cylindrical hole including the concave portion, the center case can be accommodated in the cylindrical hole with a margin.
[0011]
(Invention of Claim 4)
The starter according to any one of claims 1 to 3,
The center case and the internal gear are provided with opposing walls that oppose each other across the elastic body in the circumferential direction. The elastic body is elastically compressed between the opposing walls, so that the two are relatively rotatable. In addition, a regulating means for regulating the amount of compression of the elastic body is provided.
[0012]
In this configuration, when excessive torque is applied to the internal gear due to, for example, rotation fluctuations at the time of engine start, the elastic body is elastically compressed and the rotation of the internal gear is allowed. Power is absorbed.
Further, when the internal gear rotates with respect to the center case, the amount of compression of the elastic body is regulated by the regulating means, so that the elastic body can be prevented from being fully compressed, and the elastic body can be prevented from being fatigued and damaged at an early stage. .
[0013]
(Invention of claim 5)
In the starter according to claim 4,
The restricting means is composed of a projection provided on the center case and a projection provided on the internal gear. When relative rotation occurs between the center case and the internal gear, the two projections come into contact with each other. Due to the contact, the amount of compression of the elastic body is limited.
[0014]
In this configuration, when relative rotation occurs between the center case and the internal gear (when excessive torque is applied to the internal gear and the internal gear rotates with respect to the center case), the projections of the two come into contact with each other. This stops the relative rotation. As a result, the elastic body that elastically compresses in accordance with the relative rotation of the two is not further compressed, and the amount of compression is limited.
[0015]
(Invention of claim 6)
In the starter according to claim 5,
In the center case, a projection provided as a regulating means is arranged near the projection.
When relative rotation occurs between the center case and the internal gear, the projection provided on the center case comes into contact with the projection provided on the internal gear, so that the relative rotation stops. At this time, since a collision load occurs when the two projections come into contact with each other, a part of the collision load can be released to the projection side by disposing the projection of the center case near the projection. Therefore, a structure advantageous in strength can be obtained.
[0016]
(Invention of claim 7)
A starter according to any one of claims 1 to 6, wherein an output shaft to which the rotational force of the motor is transmitted via a planetary gear reduction device, a pinion gear on the side opposite to the motor in the axial direction, and a helical shaft on the output shaft. A pinion moving body provided to be movable on the output shaft by spline fitting, and a rotation restricting means for restricting rotation of the pinion moving body, and a pinion moving body whose rotation is restricted by the rotation restricting means is provided. In this method, the rotation of the output shaft moves on the output shaft in the direction opposite to the motor so that the pinion gear meshes with the ring gear of the engine.
[0017]
(Invention of claim 8)
A starter according to the present invention includes a planetary gear reduction device that reduces the rotation speed of a motor, and a center case that houses the planetary gear reduction device, and a stopper provided on an inner peripheral surface of a cylindrical portion of the center case. The rotation of the internal gear is regulated by the contact of the engaging portion provided on the outer peripheral surface of the annular body of the null gear.
In the center case, when the internal gear is inserted into the case, the opening of the cylindrical portion is formed as a guide hole for guiding the internal gear.
[0018]
According to the above configuration, when the internal gear is inserted into the center case, the internal gear is guided to the inside of the center case by the guide hole formed in the opening of the cylindrical portion. The internal gear can be easily assembled.
[0019]
(Invention of claim 9)
In the starter according to claim 8,
In the opening of the cylindrical portion, a guide hole is provided in a tapered shape.
In this case, the internal gear can be smoothly housed inside the center case along the tapered shape of the guide hole.
[0020]
(Invention of claim 10)
In the starter according to claim 8,
In the opening of the cylindrical portion, the inner diameter of the guide hole is provided to be larger than the inner diameter of the inner peripheral surface provided with the stopper.
In this case, the internal gear can be inserted into the center case with a margin.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a starter according to the present invention will be described with reference to the drawings.
(1st Embodiment)
FIG. 1 is an overall side view including a partial cross section of the starter 1.
As shown in FIG. 1, a starter 1 according to the present embodiment includes a motor 2 that generates a rotational force in a built-in armature (not shown), a speed reducer (to be described later) that reduces the rotational speed of the armature, and this speed reducer. A one-way clutch 4 for transmitting the rotation decelerated to the output shaft 3, a pinion gear 5 disposed on the output shaft 3, a pinion regulating member 6 for regulating the rotation of the pinion gear 5, and an excessive force applied to the drive system of the starter 1. And a shock absorbing mechanism (described later) for absorbing a strong shock force.
[0022]
The motor 2 is, for example, a well-known DC motor, and when a start switch (not shown) is turned on, a motor contact (not shown) is closed by the operation of the electromagnetic switch 7 and a battery current is supplied to the armature. Generates rotational force.
The electromagnetic switch 7 is disposed at the rear part in the axial direction of the starter 1 (the right end in FIG. 1) to turn on / off the current supplied to the motor 2 and to connect a connecting member (not shown) such as a crank bar (not shown). The pinion restricting member 6 is driven through this.
[0023]
The speed reducer is a planetary gear speed reducer using a planetary gear mechanism including a sun gear 8, a planetary gear 9, and an internal gear 10 (see FIG. 2) described below.
The sun gear 8 is formed at an end of the armature shaft and rotates integrally with the armature.
A plurality (for example, three) of the planet gears 9 are arranged around the sun gear 8, and each mesh with the sun gear 8. The planetary gear 9 is rotatably supported via a bearing 12 on a gear shaft 11 press-fitted and fixed to an outer 4a of the one-way clutch 4.
[0024]
The internal gear 10 is formed on an annular resin molded member 13 that is arranged concentrically with the sun gear 8, is engaged with the plurality of planetary gears 9, and is connected to the center case 15 via an elastic body 14 that is a buffer member. The rotation is regulated.
When the sun gear 8 is driven by the motor 2 and rotates, the planetary gear 9 meshing with the sun gear 8 rotates (rotates) around the gear shaft 11 and engages with the internal gear 10 to rotate the sun gear 8. By revolving around the periphery, the revolving motion is transmitted to the outer 4a via the gear shaft 11.
[0025]
2, the rear end of the output shaft 3 is supported by a center case 15 via a bearing 16, and the center case 15, the resin molded member 13, the elastic body 14, and the one-way The output shaft Assy is integrally assembled with the clutch 4 and the like. The output shaft Assy is inserted into a housing 17 (see FIG. 1), and a front end (an end opposite to the motor) of the output shaft 3 is supported by the housing 17 via a bearing 18. A male helical spline 3a is formed on the outer peripheral surface of the intermediate portion of the output shaft 3 in the axial direction.
[0026]
The one-way clutch 4 includes an outer 4a to which the gear shaft 11 is press-fitted and fixed, an inner 4b integrally formed at the rear end of the output shaft 3, and a cam chamber formed on the inner peripheral surface of the outer 4a (see FIG. (Not shown) and the outer peripheral surface of the inner 4b. The power is transmitted from the outer 4a to the inner 4b via the roller 4c, and the rotational force of the motor 2 is applied to the output shaft 3. To communicate.
[0027]
The pinion gear 5 has a female helical spline 5 a formed on its inner periphery, and the female helical spline 5 a meshes with the male helical spline 3 a formed on the output shaft 3 so as to be movable on the output shaft 3. Have been. In addition, the pinion gear 5 is integrally provided with a rotation restricting ring 19 at its rear end side (axial motor side), and further includes a rotation plate 21 that can rotate relative to the rotation restricting ring 19 via a bearing 20. It is assembled. On the outer diameter portion of the rotation restricting ring 19, an uneven portion 19a is formed continuously in the circumferential direction. The pinion moving body according to claim 7 of the present invention includes the pinion gear 5, the rotation restricting ring 19, the bearing 20, and the rotating plate 21.
[0028]
The pinion restricting member 6 is disposed radially outside the rotation restricting ring 19 so as to intersect with the rotation direction of the pinion gear 5, and when driven by the electromagnetic switch 7 via a crank bar or the like, is pulled down in the drawing, The rotation of the pinion gear 5 is restricted by engaging with the uneven portion 19 a of the rotation restricting ring 19.
After rotation of the pinion gear 5 is restricted, the rotation of the output shaft 3 causes the pinion gear 5 to move on the output shaft 3 in the direction opposite to the motor, and engage with a ring gear (not shown) of the engine. The rotation restriction of the pinion gear 5 is released by disengaging from the uneven portion 19 a of the pinion gear 19.
[0029]
The shock absorbing mechanism includes a center case 15, a resin molded member 13, and an elastic body 14.
As shown in FIG. 3A, the center case 15 is provided in a substantially disk shape as a whole, and six convex portions 15a are provided on a radially outer peripheral surface thereof at equal intervals in a circumferential direction. The convex portion 15a is for positioning the center case 15 with respect to the housing 17 (positioning in the circumferential direction), and protrudes from the radially outer peripheral surface in the outer peripheral direction.
Further, eight fixed protrusions are provided on the outer peripheral portion of the center case 15 so as to protrude in the axial direction from the end face on the motor side in the axial direction (see FIG. 3B).
[0030]
The eight fixed protrusions are four first fixed protrusions 15b, and the remaining four second fixed protrusions provided at a predetermined distance in the circumferential direction from the four first fixed protrusions 15b. 15c, and are arranged at 90-degree intervals in the circumferential direction.
Further, between the first fixed protrusion 15b and the second fixed protrusion 15c, there are two types of circular grooves having different circumferential lengths (a first circular groove 15d which is short in the circumferential direction and a circular groove which is long in the circumferential direction). Two circular grooves 15e) are formed (see FIG. 3C).
[0031]
As shown in FIG. 2, the resin molded member 13 has an internal gear 10 formed on an inner periphery of a ring shape on the axial motor side (right side in the figure), and has a non-motor side opposed to the center case 15 in the axial direction. Eight movable projections are provided to project from the end face in the axial direction (toward the center case 15).
The eight movable projections are, as shown in FIG. 4, four first movable projections 13a and a remaining portion provided at a predetermined distance in the circumferential direction from the four first movable projections 13a. It is formed of four second movable projections 13b, and is arranged at 90 ° intervals in the circumferential direction.
Furthermore, between the first movable protrusion 13a and the second movable protrusion 13b, two types of circular grooves having different circumferential lengths (a first circular groove that is short in the circumferential direction and A second arc groove that is long in the circumferential direction (not shown) is formed.
[0032]
As shown in FIG. 4, the center case 15 and the resin molding member 13 are connected to the first fixed projection 15b and the first movable projection 13a, and the second fixed projection 15c and the second movable projection 13b. Are combined so as to face each other in the axial direction while being adjacent to each other in the circumferential direction. Thus, the first movable protrusion 13a of the resin molded member 13 can move in the circumferential direction within the first arc groove 15d of the center case 15 within the movable range (when the first movable protrusion 13a is in the first position). (Between the position in contact with the fixing protrusion 15b and the position in contact with the second fixing protrusion 15c) so as to be rotatable with respect to the center case 15. In other words, the center case 15 allows the rotation of the resin molding member 13 (internal gear 10) within a range in which the first movable projection 13a can move in the first arc groove 15d.
[0033]
The elastic body 14 is formed, for example, by molding synthetic rubber into an arc shape. The elastic body 14 is housed in the second arc groove 15 e of the center case 15 and the second arc groove of the resin molding member 13, and the first fixed projection 15 b and the second It is sandwiched between the movable projection 13b and the movable projection 13b while being compressed by a predetermined amount (see FIG. 4). Thereby, the resin molded member 13 receives the initial load of the elastic body 14, and the first movable protrusion 13 a and the second movable protrusion 13 b are respectively moved to the first fixed protrusion 15 b and the second fixed protrusion of the center case 15. It is pressed against the portion 15c, and the movement in the circumferential direction is suppressed.
[0034]
This shock absorbing mechanism allows the elastic body 14 to elastically compress and allow the rotation of the internal gear 10 (the resin molded member 13) when an excessive torque is applied to the internal gear 10 due to rotation fluctuation at the time of engine start or the like. Thereby, the impact force applied to the drive system of the starter 1 is absorbed. The rotation of the internal gear 10 is regulated by the first movable projection 13 a provided on the resin molded member 13 abutting on the second fixed projection 15 c provided on the center case 15.
[0035]
As shown in FIG. 5, the housing 17 into which the output shaft Assy is inserted has an opening formed in the axial motor side end surface, and the opening is used when the output shaft Assy is inserted into the housing 17. It is provided as a guide hole 17a for guiding the center case 15. A cylindrical hole 17b for accommodating the center case 15 is formed inside the guide hole 17a in the axial direction (leftward in the figure), and a convex portion provided on the center case 15 is formed on the inner peripheral surface of the cylindrical hole 17b. There are provided six recesses 17c at which the recesses 15a are fitted at equal intervals in the circumferential direction (see FIG. 6).
The inner diameter of the guide hole 17a is set larger than the inner diameter of the cylindrical hole 17b including the concave portion 17c.
[0036]
Next, the operation of the starter 1 will be described.
When the start switch is closed (ON operation), the electromagnetic switch 7 operates to drive the pinion restricting member 6, and the pinion restricting member 6 engages with the uneven portion 19 a of the rotation restricting ring 19 to rotate the pinion gear 5. regulate.
On the other hand, when the motor contact is closed by the electromagnetic switch 7, a battery current flows through the armature of the motor 2, and the armature rotates.
[0037]
The rotation of the armature is transmitted to the output shaft 3 via the one-way clutch 4 after being decelerated by the reduction gear, and the output shaft 3 rotates.
Due to the rotation of the output shaft 3, the pinion gear 5 whose rotation is restricted by the pinion restricting member 6 moves on the output shaft 3 in the direction opposite to the motor by the action of the helical splines 3a, 5a, and once moves in contact with the ring gear. Stop.
[0038]
Thereafter, when the pinion gear 5 receives the rotation of the output shaft 3 and rotates to a position where it can mesh with the ring gear and meshes with the ring gear, the pinion restricting member 6 is disengaged from the uneven portion 19 a of the rotation restricting ring 19 and is located behind the rotating plate 21. Side, the rotation restriction of the pinion gear 5 is released, and the retraction of the pinion gear 5 (return on the output shaft 3 toward the motor) is prevented.
[0039]
When the motor is transmitted from the pinion gear 5 to the ring gear to start the engine and the start switch is opened (turned off), the pinion restricting member 6 comes out of the rear side of the rotary plate 21 by a reaction force of a return spring (not shown). Thereby, the retraction control of the pinion gear 5 is released. As a result, the pinion gear 5 retreats on the output shaft 3 by the reaction force of the pinion spring (not shown) for urging the pinion gear 5 in the motor direction and the retreat force received from the ring gear, and the stationary position shown in FIG. Move to and stop.
[0040]
(Operation and Effect of First Embodiment)
In the starter 1 described above, when the output shaft Assy is inserted into the housing 17, the center case 15 is guided to the cylindrical hole 17 b by the guide hole 17 a formed in the opening of the housing 17. The case 15 can be easily assembled. That is, since the inner diameter of the guide hole 17a is provided larger than the inner diameter of the cylindrical hole 17b including the concave portion 17c, the center case 15 can be accommodated in the cylindrical hole 17b with a margin. The guide hole 17a may have a tapered shape whose inner diameter gradually increases from the cylindrical hole 17b toward the opening end.
[0041]
The shock absorbing mechanism used in the starter 1 is used when the relative rotation occurs between the center case 15 and the internal gear 10 (excessive torque is applied to the internal gear 10 and the internal gear 10 When the first movable projection 13a of the resin molded member 13 abuts on the second fixed projection 15c of the center case 15, the relative rotation stops. As a result, the elastic body 14 that elastically compresses in accordance with the relative rotation of the two is not further compressed, and the amount of compression is limited, so that the entire compression of the elastic body 14 can be prevented, and Fatigue and damage can be prevented.
[0042]
Further, the center case 15 has a second fixed protrusion 15 c for regulating the rotation amount of the internal gear 10 (resin molding member 13) in a circumferential direction with respect to a protrusion 15 a protruding from the outer peripheral surface of the center case 15. , A part of the collision load generated when the first movable projection 13a provided on the resin molding member 13 comes into contact with the second fixed projection 15c provided on the center case 15 is reduced. The structure can be released to the convex portion 15a side, and a structure advantageous in strength can be obtained.
[0043]
(2nd Embodiment)
FIG. 7 is an overall side view including a partial cross section of the starter 1.
In the starter 1 of the present embodiment, as shown in FIG. 7, the pinion gear 5 is arranged on the output shaft 3 integrally with the one-way clutch 4, and the shift lever 22 is driven by using the attraction force of the electromagnetic switch 7. Then, the pinion gear 5 and the one-way clutch 4 are pushed out in the counter-motor direction (left direction in the figure) via the shift lever 22. As in the case of the starter 1 of the first embodiment, the speed reducer, the shock absorbing mechanism, and the like are used. It has.
Hereinafter, points different from the starter 1 described in the first embodiment will be mainly described. However, components and devices having the same names will be described with the same reference numerals.
[0044]
As shown in FIG. 8, the output shaft 3 has its rear end supported by a center case 15 via a bearing 16, and has a shock absorbing mechanism and a resin molding member 13 housed inside the center case 15. , And the one-way clutch 4 and the pinion gear 5 disposed on the output shaft 3 are integrally assembled as an output shaft Assy. At the rear end of the output shaft 3, a flange portion 3b that expands radially outward is provided, and a gear shaft 11 that supports the planetary gear 9 is press-fitted and fixed to the flange portion 3b.
As shown in FIG. 7, the output shaft Assy has a front end portion of the output shaft 3 supported by a housing 17 via a bearing 18, and an opening of the housing 17 has a spigot portion 15f of a center case 15 (see FIG. 8). Are fitted and assembled.
[0045]
As shown in FIG. 8, the center case 15 has an outer cylindrical portion 15A that covers the outer periphery of the resin molded member 13, and the inner cylindrical surface of the outer cylindrical portion 15A has the outer peripheral surface of the resin molded member 13 (internal gear 10). A stopper 15g for limiting the amount of rotation is provided. A guide hole 15h for guiding the resin molded member 13 when the resin molded member 13 is inserted into the inside of the outer cylindrical portion 15A is formed on the axial direction motor side of the stopper portion 15g of the outer cylindrical portion 15A. I have. The inner diameter of the guide hole 15h is larger than the inner diameter of the outer cylindrical portion 15A provided with the stopper 15g.
[0046]
The shock absorbing mechanism includes a rotating disk 23, a fixed disk 24, and a disc spring 25 described below.
The rotating disk 23 is sandwiched between a friction surface (see FIG. 8) of the center case 15 and the fixed disk 24, and its outer diameter portion is engaged with the resin molding member 13 so that the rotating disk 23 They are connected so that they cannot rotate relative to each other.
[0047]
The fixed disk 24 presses the rotating disk 23 between the fixed disk 24 and the friction surface of the center case 15 by the elastic force received from the disc spring 25 to regulate the rotation of the rotating disk 23.
The disc spring 25 fits into the inner cylindrical portion 15B of the center case 15, is caulked and fixed to the inner cylindrical portion 15B, and presses the fixed disk 24 toward the rotating disk 23. The load of the disc spring 25 for urging the fixed disk 24 can also be adjusted by forming a male screw on the inner cylindrical portion 15B of the center case 15 and tightening the adjusting screw screwed onto the male screw. is there.
[0048]
As shown in FIG. 8, the resin molded member 13 has an internal gear 10 formed on an inner periphery of a ring shape on the axial motor side (right side in the figure), and an engagement portion 13c formed on a cylindrical outer peripheral surface on the side opposite to the motor in the axial direction. Is provided. The engaging portion 13c is disposed circumferentially opposite to the stopper portion 15g provided on the center case 15, and a predetermined distance is secured therebetween. Therefore, the resin molded member 13 (internal gear 10) is rotatable with respect to the center case 15 by a distance secured between the stopper portion 15g and the engaging portion 13c.
[0049]
When the internal gear 10 is subjected to excessive torque due to rotation fluctuations at the start of the engine or the like, the shock absorbing mechanism causes the rotating disk 23 to rotate (slip) against the frictional force, so that the drive system of the starter 1 is driven. Absorb the applied impact force. The rotation of the rotary disk 23 is stopped when the engaging portion 13c provided on the resin molding member 13 comes into contact with the stopper portion 15g provided on the center case 15.
[0050]
The one-way clutch 4 has a female helical spline 4e formed on the inner periphery of a spline tube 4d provided integrally with the outer 4a. It is provided so as to be meshed with and movable on the output shaft 3 (see FIG. 8).
The pinion gear 5 is arranged on the side opposite to the motor in the axial direction of the one-way clutch 4, is provided integrally with the inner 4 b, and the rotation of the output shaft 3 is transmitted from the outer 4 a to the inner 4 b via the roller 4 c. It rotates integrally with the inner 4b.
[0051]
(Effect of Second Embodiment)
In the starter 1 of the present embodiment, when the resin molded member 13 is inserted into the outer cylindrical portion 15A, the resin molded member 13 is inserted into the center case 15 by the guide hole 15h formed in the opening of the outer cylindrical portion 15A. Guided up to. That is, since the inner diameter of the guide hole 15h is provided to be larger than the inner diameter of the outer cylindrical portion 15A having the stopper portion 15g, the resin molded member 13 can be inserted into the center case 15 with a margin. .
The guide hole 15h may have a tapered shape whose inner diameter gradually increases from the stopper portion 15g side toward the opening end side.
[Brief description of the drawings]
FIG. 1 is an overall side view including a partial cross section of a starter (first embodiment).
FIG. 2 is a side view of an output shaft Assy (first embodiment).
3A is a front view of the center case as viewed from the side opposite to the motor, FIG. 3B is a cross-sectional view of the center case, and FIG. 3C is a front view of the center case as viewed from the side of the motor (first embodiment).
FIG. 4 is a sectional view showing the internal structure of the shock absorbing mechanism (first embodiment).
FIG. 5 is a sectional view of a housing (first embodiment).
FIG. 6 is a view as viewed from A in FIG. 5 (first embodiment).
FIG. 7 is an overall side view including a partial cross section of a starter (second embodiment).
FIG. 8 is a side view of an output shaft Assy (second embodiment).
[Explanation of symbols]
1 Starter
2 motor
3 Output shaft
5 Pinion gear
6 Pinion regulating member (rotation regulating means)
8 Sun gear
9 Planetary gear
10 Internal gear
13a First movable projection (projection provided on internal gear: regulating means)
13b Second movable projection (opposing wall provided on internal gear)
13c engaging part
14 Elastic body
15 Center case
15A Outer cylindrical part (Center part cylindrical part)
15a convex
15b First fixing protrusion (opposing wall provided on center case)
15c Second fixing protrusion (protrusion provided on center case: regulating means)
15g stopper
15h Center case guide hole
17 Housing
17a Guide hole (opening) in housing
17b Cylindrical hole in housing
17c recess

Claims (10)

A motor for generating rotational force;
A planetary gear reducer for reducing the rotation speed of the motor;
A center case having a projection that protrudes radially outward from its own outer peripheral surface, while controlling rotation of an internal gear used in the planetary gear reduction device;
An opening is formed in the end face on the axial motor side, and a cylindrical hole for accommodating the center case is formed inside the opening in the axial direction. A housing having a recess formed therein,
When the center case is inserted into the housing from the opening and housed in the cylindrical hole, the protrusion fits into the recess, so that the center case is circumferentially moved with respect to the housing. A starter positioned at
The starter is characterized in that the opening is formed as a guide hole for guiding the center case to the cylindrical hole when the center case is stored in the cylindrical hole. In the starter according to claim 1,
The starter according to claim 1, wherein the guide hole is provided in the opening of the housing in a tapered shape. In the starter according to claim 1,
The starter according to claim 1, wherein the opening of the housing has an inner diameter of the guide hole larger than an inner diameter of the cylindrical hole including the recess. The starter according to any one of claims 1 to 3,
The center case and the internal gear are provided with opposing walls that oppose each other with an elastic body therebetween in the circumferential direction. The elastic body is elastically compressed between the opposing walls, so that the two rotate relative to each other. A starter characterized in that the starter is provided so as to be capable of regulating the amount of compression of the elastic body. In the starter according to claim 4,
The regulating means includes a projection provided on the center case and a projection provided on the internal gear. When relative rotation occurs between the center case and the internal gear, the two parts are restricted. A starter characterized in that the amount of compression of the elastic body is limited by the contact between the projections. In the starter according to claim 5,
The starter according to claim 1, wherein the center case has the protrusion provided as the restricting means disposed near the protrusion. The starter according to any one of claims 1 to 6,
An output shaft to which the rotational force of the motor is transmitted via the planetary gear reduction device;
A pinion gear disposed on the side opposite to the motor in the axial direction, and a helical spline fitted on the output shaft and a pinion moving body provided movably on the output shaft;
A rotation restricting means for restricting the rotation of the pinion moving body,
A starter, wherein the pinion moving body whose rotation is restricted by the rotation restricting means moves on the output shaft in a direction opposite to the motor by rotation of the output shaft, and the pinion gear meshes with a ring gear of an engine. A motor for generating rotational force;
A planetary gear mechanism comprising a sun gear, a planetary gear and an internal gear, wherein when the sun gear is driven by the motor, a planetary gear reduction device that reduces the rotation speed of the motor;
A center case for accommodating the planetary gear reduction device,
In the internal gear, an annular body is formed on the side opposite to the motor in the axial direction of the gear section that meshes with the planetary gear, and an engagement portion is provided on an outer peripheral surface of the annular body.
The center case has a cylindrical portion that covers the outer periphery of the internal gear, and a stopper that is circumferentially opposed to the engaging portion is provided on an inner peripheral surface of the cylindrical portion. A starter in which rotation of the internal gear is regulated by contacting the part,
The starter is characterized in that the opening of the cylindrical portion is formed as a guide hole for guiding the internal gear when the internal gear is inserted into the case. In the starter according to claim 8,
The starter according to claim 1, wherein the guide hole is provided in an opening of the cylindrical portion in a tapered shape. In the starter according to claim 8,
The starter according to claim 1, wherein the opening of the cylindrical portion has an inner diameter of the guide hole larger than an inner diameter of an inner peripheral surface on which the stopper is provided.

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