JP2017070026A - Starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a starter with little vibrations and noises when an armature assembly rotates capable of reducing the length between armature shaft bearings of the starter.SOLUTION: The starter has a center plate 16 which covers a planetary gear reduction mechanism 2 in an axial direction. The center plate 16 has a concave part 16b at the inner diameter side. The shape of the end part of an armature coil in a motor 1 is a convex shape in which the outer diameter of the end part is smaller than the inner diameter of the concave 16b of the center plate 16. The center plate 16 and the end part of the armature coil are wrapped each other in an axial direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a structure suitable for low vibration, low noise, small size and light weight of a starter, particularly a coaxial reduction starter of an internal combustion engine.

  As a background art of this technical field, there is JP-A-2001-116089 (Patent Document 1). This publication describes the structure of a starter including a planetary gear reducer.

JP 2001-116089 A

  In the above prior art structure, the axial position between the armature coil tip of the starter and armature kumi and the center plate of the cover that restricts the planet gear in the axial direction at the planetary reduction gear is the most armature side of the center plate. Since it is necessary to dispose the armature kumi in a position that does not interfere with the surface, the distance between the armature shaft bearings of the armature kumi, which is the rotating body of the motor unit, cannot be shortened, and the length between the armature shaft bearings is long. As a result, there is a problem that the armature shaft is greatly shaken and deflected, and the vibration and noise at the time of armature kumi rotation using the armature shaft axis as a rotating body are large.

  Accordingly, an object of the present invention is to provide a starter that reduces the length between the armature shaft bearings of the starter and that has less vibration and noise when the armature is rotated.

  In order to solve the above problems, for example, the configuration described in the claims is adopted.

  The present application includes a plurality of means for solving the above-described problems. For example, a starter having a center plate that covers the planetary gear speed reduction mechanism portion in the axial direction, the center plate having a recess on the inner diameter side. And the shape of the end of the armature coil of the motor is a convex shape in which the outer diameter of the end is smaller than the inner diameter of the concave of the center plate, and the center plate and the end of the armature coil are in the axial direction. It is characterized by being wrapped.

  ADVANTAGE OF THE INVENTION According to this invention, the length between the armature shaft bearings of a starter can be shortened, and the starter with few vibration and noise at the time of armature kumi rotation can be provided.

  Problems, configurations, and effects other than those described above will become apparent from the description of the following examples.

It is sectional drawing of one Example which shows the starter structure by this invention, and operation | movement. It is sectional drawing of one Example which shows the structure of the starter motor part and reduction gear part by this invention of FIG. It is sectional drawing which shows the structure of the motor part and reduction gear part of the conventional starter.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 is a sectional view of a starter according to an embodiment including a motor unit 1 and a planetary gear reduction mechanism unit 2 according to the present invention. The operation of the starter will be described with reference to FIG.

  In FIG. 1, a starter includes a motor unit 1 that receives energization to generate a rotational force in an armature kumi 3, a pinion shaft 5 in which a pinion 4 is fitted on a shaft, and a planetary gear reduction mechanism that reduces the rotational speed of the motor unit 1. 2, a one-way clutch 6 that transmits rotational force from the planetary gear speed reduction mechanism unit 2 to the pinion shaft 5, and a magnet switch 7 that controls energization of the motor unit 1 and generates pushing force of the pinion 4. ing.

  The motor unit 1 is a direct current motor, and includes, in addition to the armature kumi 3, a magnet 8 disposed on the outer periphery of the armature kumi 3 and a cylindrical yoke 9 that fixes the magnet 8 to the inner peripheral surface, and is not illustrated. When the starter switch is turned on and a motor contact (not shown) built in the magnet switch 7 is closed, the armature kumi 3 is energized to rotate.

  The pinion shaft 5 is disposed on the same axis as the armature shaft 3a on the front side (pinion 4 side) of the motor unit 1, and a tip end portion thereof is rotatably supported by the gear case 10 via a bearing 10a. A hollow cylindrical recess is formed in the center of the rear end of the pinion shaft 5, and the tip of the armature shaft 3a is rotatably supported in the recess via a bearing 5a. A helical spline 5b is formed on the outer periphery of the pinion shaft 5, and the helical spline 6b of the clutch sleeve 6a is fitted to the helical spline 5b. Next, the clutch sleeve 6a is engaged with the pinion 4 via the roller 6c. The pinion 4 meshes with the ring gear 12 of the engine and transmits the rotational force of the motor unit 1 to the ring gear 12. The clutch sleeve 6 a is provided on the pinion shaft 5 along the helical spline 5 b so as to be able to advance and retreat. Yes.

  Next, the planetary gear speed reduction mechanism 2 is constituted by an armature gear 3b formed on the outer periphery of the tip of the armature shaft 3a, a plurality of planet gears 13 that mesh with the armature gear 3b, and an internal gear 14 that meshes with each planet gear 13. Is done. The planet gear 13 transmits the rotation of the armature shaft 3a to each planet gear 13 by rotating integrally with the armature shaft 3a. Each planet gear 13 is rotatably supported on the outer periphery of a pin 15 inserted and fixed to the pinion shaft 5 through a bearing 13a, meshes with the armature gear 3b and the internal gear 14, and rotates while rotating. Revolve around the perimeter. Therefore, when each planet gear 13 revolves around the outer periphery of the armature gear 3b, the revolving force is transmitted to the pinion shaft 5 through the pin 15, whereby the clutch sleeve 6a, the roller 6c, and the pinion 4 rotate. The internal gear 14 and the center plate 16 are sandwiched between the gear case 10 and the yoke 9 and are fixed in a non-rotatable state.

  Next, an example of the structure of the motor unit 1 and the planetary gear speed reduction mechanism unit 2 configured as described above will be shown.

  FIG. 2 is a cross-sectional view of the motor unit 1 and the planetary gear speed reduction mechanism unit 2 of the present invention. The center plate 16 is connected to the planet gear 13 and the pinion shaft 5 and the pin 15 arranged in the internal gear 14. The configuration covers the axial direction. Further, the center plate 16 has an inner diameter shape of the outer diameter portion 16 a sandwiched between the gear case 10, the yoke 9 and the internal gear 14. A recess 16b having a shape recessed toward the front side to the end surface 13b of the gear 13 is formed. The armature coil angle θ is provided at the tip of the armature coil of the armature kumi 3 so as not to interfere with the center plate 16 in accordance with the recessed portion 16b that is recessed from the outer diameter portion 16a of the center plate 16. In other words, the center plate 16 has the concave portion 16b on the inner diameter side, and the shape of the end portion of the armature coil of the motor unit 1 is a convex shape in which the outer diameter of the end portion is smaller than the inner diameter of the concave portion 16b of the center plate 16, The concave portion 16b of the center plate 16 and the end portion of the armature coil wrap in the axial direction (the end portion of the armature coil is accommodated in the concave portion 16b of the center plate 16). At this time, the armature shaft 3a is supported by a bearing 11a that is press-fitted into the rear cover 11 of the motor unit 1 and a bearing 5a that is press-fitted into the pinion shaft 5 of the planetary gear reduction mechanism unit 2, and the distance between the bearings of the armature shaft 3a is L1. It becomes.

  Next, an example of the structure of the motor unit 1 and the planetary gear reduction mechanism unit 2 having a conventional configuration will be described.

  FIG. 3 is a cross-sectional view of the conventional motor unit 1 and planetary gear speed reduction mechanism unit 2. The center plate 16 has a planet gear 13, a pinion shaft 5 and a pin 15 arranged in the internal gear 14, and the center plate 16 has an axis. The outer diameter portion 16 a of the center plate 16 is sandwiched between the gear case 10, the yoke 9 and the internal gear 14. The armature coil tip portion of the armature kumi 3 is positioned so as not to interfere with the surface of the outer diameter portion 16a of the center plate 16. At this time, the distance between the bearings of the armature shaft 3a is L2.

  As described above, according to the present invention, the center plate recess for covering the planetary reduction gear housing component in the axial direction has an angle at the end of the armature coil and a convex shape, and the center plate and the end of the armature coil are wrapped in the axial direction. I let you. That is, the armature coil 3 is moved forward and the armature kumi 3 is moved forward and wrapped with the center plate 16 in the axial direction, so that the distance between the bearings of the armature shaft 3a can be reduced from L2 to L1.

  As described above, according to the present invention, the shaft length between the motor portion and the speed reducer portion is shortened, and the length between the armature shaft bearings is shortened, so that vibration and deflection during rotation of the armature shaft are reduced, and the armature The rotational vibration and noise of the kumi can be reduced, and the starter shaft length can be shortened to reduce the size and weight of the starter.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

DESCRIPTION OF SYMBOLS 1 ... Motor part 2 ... Planetary gear reduction mechanism part 3 ... Armature kumi 3a ... Armature shaft 3b ... Armature gear θ ... Armature coil angle 4 ... Pinion 5 ... Pinion shaft 5a ... Bearing 5b ... Helical spline 6 ... One-way clutch 6a ... Clutch sleeve 6b ... helical spline 6c ... roller 7 ... magnet switch 8 ... magnet 9 ... yoke 10 ... gear case 10a ... bearing 11 ... rear cover 11a ... bearing 12 ... ring gear 13 ... planet gear 13a ... bearing 13b ... end face 14 ... internal gear 15 ... Pin 16 ... Center plate 16a ... Outer diameter part 16b ... Recess

Claims (2)

A starter having a center plate that covers the planetary gear reduction mechanism in the axial direction,
The center plate has a recess on the inner diameter side,
The shape of the end portion of the armature coil of the motor is a convex shape in which the outer diameter of the end portion is smaller than the inner diameter of the concave portion of the center plate,
A starter in which the center plate and an end of the armature coil are wrapped in the axial direction. The starter according to claim 1,
The planetary gear speed reduction mechanism is composed of an armature gear provided on the outer periphery of the tip of the armature shaft, a plurality of planet gears that mesh with the armature gear, and an internal gear that meshes with the planet gear,
The planet gear transmits the rotation of the armature shaft to the planet gear by rotating integrally with the armature shaft,
The planet gear is rotatably supported on the outer periphery of a pin provided on the pinion shaft via a bearing, and meshes with the armature gear and the internal gear,
The center plate covers the planet gear, the pinion shaft, and the pin arranged in the internal gear in the axial direction,
A starter in which the concave portion of the center plate is recessed toward the pinion shaft with respect to an outer diameter portion sandwiched between the yoke of the motor and the internal gear.

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