JP5058937B2 - Starter - Google Patents

Description

  The present invention belongs to the technical field of starters mounted on vehicles such as motorcycles.

  Generally, among starters for starting an engine, when this is for a motorcycle, a plurality of planetary gears that revolve the sun gear formed on the motor shaft at the tip of the motor portion having the motor shaft, and these It is known that a support piece portion to which a gear shaft of a planetary gear is fixed is integrally formed, and a reduction mechanism configured by revolution of the planetary gear and an output shaft that rotates integrally is provided.

In such a case, the first and second reduction mechanisms are provided in parallel in the axial direction of the motor shaft, and the first stage reduction is performed by using the first reduction mechanism for the rotational force (power) of the motor shaft. It has been proposed that the first output shaft is transmitted to the first output shaft, and the driving force of the first output shaft is transmitted to the second output shaft by performing a second-stage deceleration through a second speed reduction mechanism.
JP 2006-118494 A

However, in the conventional first reduction mechanism, the output shaft (first output shaft) includes a shaft portion serving as a power take-out portion and a support piece portion integrally formed at the base end portion of the shaft portion. A plurality of planetary gears are provided on the base end side of the motor, and the armature core of the motor unit faces the base end side of these planetary gears. In this case, a predetermined gap is formed between the planetary gear and the armature core, and there is no member that restricts the thrust movement toward the base end side of the planetary gear. For this reason, the movement restriction plate is provided in a state where the movement restriction plate is supported by the yoke (case body), thereby restricting the movement of the planetary gear, which not only increases the number of parts but also makes the installation work troublesome. There is a problem of becoming.
Further, in this configuration, a cylindrical portion is recessed in the shaft core portion of the rotating body formed integrally with the first output shaft, and the tip portion of the motor shaft is supported by the cylindrical portion. Since the tip end portion of the motor shaft is supported only by the cylindrical portion, the cylindrical portion is supported via a center plate that is supported by a yoke (case body). For this reason, there is a problem that the assembling work of the speed reduction mechanism becomes more complicated and the workability is lowered, and there is a problem to be solved by the present invention.

The present invention has been created in view of the above-described circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is directed to a motor shaft including a motor shaft and a motor shaft. A plurality of planetary gears that revolve the formed sun gear and a support piece portion to which the gear shafts of these planetary gears are fixed are integrally formed, and a reduction mechanism is provided that includes an output shaft that rotates together with the planetary gear revolutions. In the starter, the output shaft has a cylindrical portion integrally formed between the base end portion of the shaft portion serving as a power take-out portion and the support piece portion, and a planetary gear is provided on the distal end side of the support piece portion. The planetary gear is partly located in the cylindrical hole through a notch formed in the cylindrical part, and a through hole communicating with the cylindrical hole of the cylindrical part is opened in the support piece part. The motor shaft is inserted into the cylindrical hole through the sun, and the sun gear and the planetary gear mesh. Configuration and was a starter.
The invention according to claim 2 is the starter according to claim 1, wherein the planetary gear is configured to be restricted in movement in the thrust direction by the support piece and the notch on the tip side of the notch.
According to a third aspect of the present invention, the motor shaft is rotatably supported by a bracket disposed at the tip end side cylinder end of the yoke constituting the motor portion, and the output shaft is provided in the through hole of the support piece portion. The starter according to claim 1 or 2, wherein the starter is supported by a motor shaft through a bearing so as to be relatively rotatable.

With the invention of claim 1, the number of parts can be reduced and the assembling work can be simplified.
With the invention of claim 2, the number of parts can be reduced, the configuration can be simplified, and the workability of the assembling work can be improved.
According to the invention of claim 3, the number of parts can be further reduced, and the starter can be made lighter and more compact.

Next, embodiments of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a starter mounted on a motorcycle. The starter 1 includes a motor part M provided on a base end side and a speed reduction mechanism part D provided on a half part on a front end side. ing. The motor part M is formed into a bottomed cylindrical shape by a cylindrical yoke 2 having a plurality of permanent magnets 2a fixed on the inner peripheral surface and a base end side bracket 3 that covers the base end side of the yoke 2. The armature 5 formed by winding the coil 5b around the outer periphery of the cylinder 4 that is formed and is fitted around the motor 4 in a non-rotating manner is provided inside the cylinder. The base end portion of the motor shaft 4 is rotatably supported by the base end side bracket 3 via a bearing 3a, while the tip end portion of the motor shaft 4 is a tip provided at the tube end on the tip end side of the yoke 2. The side bracket 6 is configured to be rotatably supported via a bearing 6a. Here, the front end side bracket 6 is formed to have a larger diameter than the outer diameter of the yoke 2, and a plurality of mounting pieces 3 b are projected on the outer periphery of the base end side bracket 3. The provided brackets 3 and 6 are configured to be integrated by a through bolt 7 disposed on the outer diameter side of the yoke 2.
Further, the motor shaft 4 of the motor part M penetrates the front end side bracket 6 and protrudes to the front end side, and gear teeth 4b are formed on the front end side of the protruding end portion 4a of the motor shaft 4.

And the speed-reduction mechanism part D is provided in the front end side of the front end side bracket 6 of the motor part M, The speed reduction mechanism part D of this Embodiment is the 1st speed reduction mechanism D1 provided adjacent to the front end side bracket 6, and The second reduction mechanism D2 provided on the front end side of the first reduction mechanism D1 is provided.
The first speed reduction mechanism D1 corresponds to the speed reduction mechanism in which the present invention is implemented, and the gear teeth 4b formed on the protruding end portion 4a of the motor shaft 4 that penetrates the front end side bracket 6 are used as the first sun gear. It is configured as follows. Reference numeral 8 denotes a first output shaft corresponding to the output shaft of the present invention. The first output shaft 8 has a stepped portion 8b having a diameter larger than that of the shaft portion 8b on the proximal end side of the shaft portion 8a. A cylindrical portion 8c extending to the base end side is integrally formed on the outer peripheral edge of the portion 8b, and a hook-shaped support piece portion extending to the outer diameter side at the base end side edge of the cylindrical portion 8c. 8d is formed. The support piece 8d is provided with through holes 8e penetrating in the axial direction at a plurality of places in the circumferential direction (two places in the present embodiment), and the first planetary gears 9 are respectively formed in the through holes 8e. The first gear shaft 9a is integrally inserted and supported.

Here, the two first planetary gears 9 are respectively supported by the first gear shaft 9a and the first gear shaft 9a so as to be rotatable, and gear teeth that mesh with the first sun gear 4a are formed on the outer peripheral surface. It is comprised by the 1st gear part 9b. And these 1st planetary gears 9 are provided so that it may be located in the front end side of the support piece part 8d, ie, the arrangement | positioning side of the axial part 8a, but the outer diameter of the 1st gear part 9b of the 1st planetary gear 9 is provided. Is set to a size that reaches the inside of the cylindrical portion 8c formed between the support piece portion 8d and the shaft portion 8a. For this reason, the notch part 8f is formed in the site | part facing the 1st gear part 9b of the cylindrical part 8c, and a part of each 1st gear part 9b passes through these notch parts 8f, and the cylindrical part 8c. It is arrange | positioned so that it may be located in a cylinder.
At this time, the first planetary gear 9 has the first gear portion 9b slidably disposed on the support piece portion 8d so that the support piece portion 8d is thrust toward the proximal end side in the axial direction of the first gear portion 9b. It is configured to restrict movement. Furthermore, the front end side surface of the first gear portion 9b is disposed in close proximity to the notch piece 8g on the front end side constituting each notch portion 8f, and the shaft of the first gear portion 9b is formed by the notch piece 8g. It is comprised so that the thrust movement to the direction front end side may be controlled. Thereby, the first output shaft 8 is configured so that the first planetary gear 9 can be supported and incorporated in a state in which the thrust movement is restricted, and it is not necessary to separately provide a movement restriction plate, and the number of parts can be reduced. It is configured to simplify the configuration. Further, the first output shaft 8 and the first planetary gear 9 can be incorporated in the motor unit M as the first reduction unit U in a state in which the first output shaft 8 and the first planetary gear 9 are incorporated, and the workability of the assembling work is improved. Yes.

Further, as described above, the support piece portion 8d of the first output shaft 8 is formed so as to protrude from the proximal end side edge of the cylindrical portion 8c in a bowl shape, and the shaft core portion of the support piece portion 8d has The through hole 8h communicates with the cylindrical hole of the cylindrical portion 8c. And the 1st sun gear 4b formed in the protrusion end part 4a of the motor shaft 4 is inserted from the through-hole 8h side of the support piece part 8d, and is inserted into the cylindrical hole of the cylindrical part 8c through the through-hole 8h. The first planetary gear 9 is engaged with the first gear portion 9b in the cylindrical hole. The first output shaft 8 is supported by the protruding end portion 4a of the motor shaft 4 so as to be relatively rotatable via a bearing 8i provided in the through hole 8h of the support piece portion 8d. At this time, the motor shaft 4 is configured such that a portion adjacent to the bearing portion of the support piece 8d is a bearing portion by the front end side bracket 6 of the motor portion M, and the first output shaft 8 can be reliably supported. ing. As a result, there is no need to prepare a separate support member as in the case of supporting the outer peripheral portion of the first output shaft 8, and the number of parts can be further reduced, and the bearing member is interposed in the through hole 8h. For example, the bearing 8i can have a small diameter like a needle bearing, and the starter 1 can be reduced in weight and size.
The shaft portion 8a of the first output shaft 8 has a power take-off gear 8j formed on the outer peripheral surface of the tip, which is the base end side of the shaft portion 8a, and the second outer peripheral surface of the step portion 8b has a second end surface. A second sun gear 8k constituting the speed reduction mechanism D2 is formed.

On the other hand, a cylindrical gear bracket 10 is provided adjacent to the front end side bracket 6 of the motor part M. The gear bracket 10 is positioned on the outer diameter side of the first planetary gear 9, and a first internal gear 10a is formed. Note that, on the inner peripheral surface of the gear bracket 10, a second internal gear 10b that forms the second reduction mechanism D2 is formed on the tip side of the first internal gear 10a.
The first planetary gear 9 revolves around the outer periphery of the first sun gear 4b along the first internal gear 10a by rotating in response to the rotational force (power) input from the first sun gear 4b. Thus, the rotational force (power) of the motor shaft is transmitted to the shaft portion 8a of the first output shaft 8 as the rotational force (power) subjected to the first-stage deceleration.

  Further, an end bracket 11 that houses the second speed reduction mechanism D2 is provided on the distal end side of the gear bracket 10, and the distal end side bracket 6, the gear bracket 10, and the end bracket 11 are in a circumferential direction at the outer peripheral portions thereof. They are integrated by screwing through bolts 12 provided at a plurality of locations. In addition, the through-bolt 7 arrangement position, which is the means for integrating the base end side bracket 3 and the tip end side bracket 6 of the motor part M, becomes the means for integrating the tip end side bracket 6, the gear bracket 10 and the end bracket 11. The through bolt 12 is set so as to be located on the inner diameter side of the position where the through bolt 12 is disposed, whereby the outer diameter of the motor part M and the outer diameter of the speed reduction mechanism part D can be set to different dimensions. Without changing the outer diameter, the diameter of the planetary gears 9 and 14 of the speed reduction mechanism portion D is made large so that the reduction ratio can be set large.

And the end bracket 11 becomes a structure which supports the axial part 13a of the cylindrical 2nd output shaft 13 which comprises the 2nd deceleration mechanism D2 rotatably via the bearing 11a. The second output shaft 13 is integrally formed with a hook-shaped support piece portion 13b on the proximal end side of the shaft portion 13a, and a plurality of (two in this embodiment) are provided on the proximal end side of the support piece portion 13b. The second gear shaft 14a of the second planetary gear 14 is fixed. The second gear portion 14b rotatably supported by the second gear shaft 14a is slidably supported on the base end side surface of the support piece portion 13b, and the second planetary gear 14, the first planetary gear 9, Are arranged adjacent to each other in the axial direction with a predetermined gap. The second gear portion 14b of the second planetary gear 14 is configured to mesh with the second internal gear 10b and the second sun gear 8k, respectively.
Here, the first and second planetary gears 9 and 14 are disposed adjacent to each other in the axial direction, and for supporting the output shaft on the case body (yoke) between them, as in the prior art. The member is not disposed. For this reason, the internal gears 10a and 10b meshing with the first and second planetary gears 9 and 14 can be formed together in one gear bracket 10 arranged on the outer periphery thereof, thereby reducing the number of parts. It is configured so that it can be reduced.
The second planetary gear 14 rotates when the rotational force output from the first output shaft 8 is transmitted through the second sun gear 8j and rotates along the second internal gear 10b. Is transmitted to the shaft portion 13a of the second output shaft 13 as a rotational force subjected to second-stage deceleration.
Reference numeral 13 c denotes a power take-out gear formed at the tip of the shaft portion 13 a of the second output shaft 13.

  Here, in the present embodiment, the first output shaft 8 protrudes toward the distal end side of the second output shaft 13, and the power take-out gears 8j and 13c of the first and second output shafts 8 and 13 respectively end. It is exposed outside the bracket 11. Thereby, it is comprised so that the rotational force decelerated in each 1st, 2nd step can be taken out outside. In this case, the power take-off gear 8k formed at the tip of the first output shaft 8 is meshed with a gear (not shown) on the engine side, whereby the engine is accompanied with the rotation of the first output shaft 8. It is configured to be started. Further, the power take-out gear 13c formed at the tip of the second output shaft 13 can be connected to, for example, a reverse gear. In this case, the motor portion M of the starter 1 is used as a reverse drive member. It is comprised so that it can be combined.

In the present embodiment configured as described, the starter 1 includes a motor part M and a speed reduction mechanism part D, and the first output shaft 8 of the first speed reduction mechanism D1 constituting the speed reduction mechanism D is: A first planetary gear 9 is provided on a support piece 8d provided on the base end side of the shaft 8a, and rotates integrally with the revolution of the first planetary gear 9. In this case, since the first planetary gear 9 is arranged on the distal end side of the support piece portion 8d, the support piece portion 8d can regulate the thrust movement of the first planetary gear 9 toward the motor portion M, When the output shaft incorporating the planetary gear is incorporated in the motor unit, as in the case where a conventional planetary gear is provided on the base end side of the support piece, the restriction plate that restricts the movement of the planetary gear is supported on the yoke in advance. This eliminates the need for such work, reduces the number of parts, and simplifies the assembly work.
In the present embodiment, the first and second reduction mechanisms D1 and D2 are provided as the reduction mechanism D, but the first planetary gear 9 of the first reduction mechanism D1 provided on the axial base end side is supported. The second planetary gear 14 of the second speed reduction mechanism D2 provided on the distal end side of the piece portion 8d and provided on the axially distal end side is provided on the proximal end side of the support piece portion 13b, and the first and second planetary gears are provided. Since the first and second planetary gears 9 and 14 mesh with the first and second planetary gears 9 and 14 from the outer periphery, the first and second internal gears 10a and 10b mesh with the first and second planetary gears 9 and 14, respectively. There is also an advantage that it can be provided.

As described above, in the embodiment in which the present invention is implemented, the thrust movement toward the base end side of the first planetary gear 9 is performed by the support piece portion 8d of the first output shaft 8, In this configuration, the meshing portion between the first gear portion 9b of the first planetary gear 9 and the first sun gear 4b of the motor shaft 4 is provided between the base end portion of the shaft portion 8a of the first output shaft 8 and the support piece portion 8d. A cylindrical portion 8c having a cylindrical hole is formed. For this reason, the 1st gear part 9b becomes a structure which is located in a cylinder hole via the notch part 8f of the cylindrical part 8c, and meshes | engages with the 1st sun gear 4b, and comprises the notch part 8f. By forming the notch piece 8g on the distal end side so as to be close to and opposed to the first planetary gear 9, the thrust movement of the first planetary gear 9 toward the distal end side is restricted. Accordingly, the first planetary gear 9 can be provided on the first output shaft 8 without providing any movement restricting members on both sides in the thrust direction, and the number of parts can be reduced and the configuration can be simplified.
Moreover, the first output shaft 8 and the first planetary gear 9 are incorporated in the motor unit M as the first reduction unit U incorporated in the first output shaft 8 in a state where the thrust movement of the first planetary gear 9 is restricted. As a result, it is possible to improve the workability of the assembly work.

  Further, in this case, the first output shaft 8 does not support the outer peripheral portion on the case body (yoke) like the conventional one, but rather on the base end side (motor portion) than the first planetary gear 9. The through hole 8h of the support piece portion 8d located on the M side is supported by the protruding end portion 4a of the motor shaft 4 supported by the front end side bracket 6 via a bearing 8i so as to be relatively rotatable. As a result, a member for supporting the first output shaft 8 can be supported without being separately provided, and the number of parts can be further reduced, and a small-diameter bearing 8i provided in the through hole 8h can be used. 1 can be reduced in size and weight.

It is a partial cross section side view of a starter. It is a perspective view of a 1st output shaft. It is a perspective view of a 1st deceleration unit. It is sectional drawing of a 1st deceleration unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Starter 2 Yoke 3 Base end side bracket 4 Motor shaft 4b 1st sun gear 6 Front end side bracket 8 1st output shaft 8c Cylindrical part 8d Support piece part 8f Notch part 8g Notch piece 8k Second sun gear 9 1st Planetary gear 9b First gear part 10 Gear bracket 11 End bracket 13 Second output shaft 14 Second planetary gear

Claims (3)

  A plurality of planetary gears that revolve the sun gear formed on the motor shaft and a support piece portion to which the gear shafts of these planetary gears are fixed are integrally formed on the front end side of the motor unit including the motor shaft. In a starter provided with a speed reduction mechanism provided with a revolution and an output shaft that rotates integrally with the output shaft, a cylindrical portion is integrally formed between a base end portion of a shaft portion serving as a power take-out portion and a support piece portion. A planetary gear is provided on the front end side of the support piece, and a part of the planetary gear is positioned in the cylindrical hole through a notch formed in the cylindrical part, and the support piece is tubular. A starter having a configuration in which a through hole communicating with the cylindrical hole of the part is opened, a motor shaft is fitted into the cylindrical hole through the through hole, and the sun gear and the planetary gear are engaged.   2. The starter according to claim 1, wherein the planetary gear is configured to be restricted in movement in a thrust direction by a support piece and a notch on a tip side of the notch.   The motor shaft is rotatably supported by a bracket disposed at the end of the yoke that constitutes the motor portion, and the output shaft is connected to the motor shaft via a bearing provided in the through hole of the support piece. The starter according to claim 1, wherein the starter is configured to be relatively rotatable with respect to each other.

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