JP5129658B2 - Starter motor with waterproof terminal structure - Google Patents

Description

  The present invention relates to a starter motor having a terminal waterproof structure suitable for a motorcycle.

  2. Description of the Related Art Conventionally, in automobile starter motors, there are those in which a bolt-shaped pin-shaped terminal protruding from the end surface in the axial direction of the starter motor is provided as a power supply terminal, and the pin-shaped terminal has a crimp terminal fixed to the power connection cable. It is fixed with a nut. Further, there is provided an anti-rotation member having an annular peripheral wall-shaped cylindrical peripheral portion surrounding the pin-shaped terminal and provided with a notched portion for pulling out the power connection cable by partially cutting the cylindrical peripheral portion. (See, for example, Patent Document 1).

The anti-rotation structure of the anti-rotation member may be formed by forming the cylindrical peripheral portion into a polygonal shape, providing similar polygonal ribs on the corresponding end surfaces of the motor casing, and fitting them together. And by fitting the crimp terminal of the power connection cable to the pin-shaped terminal and pulling out the power connection cable through the notch, and tightening the nut, it is possible to prevent the power connection cable from rotating together when tightening the nut. The
JP 2007-124844 A

  On the other hand, some motorcycles have a starter motor assembled in an exposed state. When the above-mentioned rotation preventing member is used for such a starter motor, the axial opening and the cutout portion of the above-described cylindrical peripheral portion of the rotation preventing member are opened outwardly, In addition, there is a risk of flooding into the cylinder periphery of the detent member when it rains. In order to prevent the flooding, a certain waterproof structure is applied to the anti-rotation member, but it is not only necessary to facilitate assembly but also to be difficult to come off against vibration.

In order to solve such a problem, in the starter motor, in order to realize a waterproof structure for a joint portion between the pin-like terminal and the external connection cable, which is easy to assemble and does not come off due to vibration. A pin-like terminal projecting on the outer surface of the starter motor and connected to an external connection cable; a detent member provided on the outer surface of the starter motor so as to surround the terminal; and the terminal A notch formed in a part of the detent member to pass the coupled external connection cable, and a terminal cover provided with a cap-shaped top plate covering at least the upper opening surface of the detent member. A first wall portion formed integrally with the top plate portion so as to cover the cutout portion; and an outer side from the rotation preventing member of the external connection cable. A tubular part integrally formed on the first wall part so as to protrude from the intermediate part of the first wall part to surround the extending part, and the first wall part together with the first wall part have a second wall portion formed in the top plate portion integrally so as to sandwich the detent member in close contact, the detent the notch and the wall surface that is provided with the second wall portion of the member The wall surfaces that are in close contact with each other are assumed to be parallel to each other .

  In particular, the terminal cover may have a wall portion provided over the entire circumference at the same height as the first wall portion. Moreover, it is preferable that the wall surface provided with the notch portion of the rotation preventing member and the wall surface that closely contacts the second wall portion are parallel to each other. In addition, it is preferable that a rib is provided on the outer peripheral surface of the anti-rotation member over the entire circumference, and a groove formed on the inner peripheral surface of the terminal cover is provided.

  As described above, according to the first aspect of the present invention, the shape of the terminal cover is set together with the first wall portion provided with the tubular portion surrounding the outwardly extending portion of the external connection cable, and the first wall portion. Since the second wall portion for sandwiching the anti-rotation member is formed integrally with the top plate portion, the anti-rotation member can be clamped by both wall portions in a state where the terminal cover is attached to the anti-rotation member. Since the first wall portion side is integrated with the external connection cable fixed to the pin-like terminal, the second wall portion on the opposite side is easily detached while it is difficult to come off from the annular wall portion even with strong vibration. On the other hand, because of the above structure, the anti-rotation member is sandwiched together with the first wall portion, and therefore the anti-rotation member of the second wall portion even if the first wall portion side is turned up. The contact portion with respect to is wide, it becomes a large resistance, can suppress the flipping, and can prevent the terminal cover from coming off.

  In particular, according to the second aspect, since the wall portion having the same height as the first wall portion is provided over the entire periphery of the top plate portion of the terminal cover, the outer peripheral surface of the rotation preventing member is entirely covered with the terminal cover. It can be covered deeply by the wall part provided in the periphery, and even if the terminal cover is likely to come off due to vibration, a large resistance can be exerted. According to the third aspect, it is possible to resist the turning up of the second wall portion side by the surface contact between the second wall portion and the anti-rotation member, and a large resistance force can be exhibited. According to the fourth aspect of the present invention, the rotation preventing member and the terminal cover are more unlikely to come off because the rib and the groove are engaged.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view showing a starter motor for a motorcycle to which the present invention is applied, with a main portion of the starter motor having a terminal waterproof structure cut away. A starter motor 1 shown in the figure includes a cylindrical yoke 2 and a bowl-shaped end bracket 3 that covers one axial opening of the yoke 2. In the end bracket 3, a commutator 4 integrally provided at an axial end of an armature (not shown), a brush holder 5 fixed to the bottom wall (inner end surface) of the end bracket 3, and the commutator 4 The brush 6 supported by the brush holder 5 so as to be slidable to the brush 6, the terminal member 7 connected to the pigtail for connection with the brush 6 and provided in the brush holder 5, and the terminal member 7 and the brush holder 5 A bolt-type pin-like terminal 8 is provided so as to penetrate both members so as to be tightened and to protrude outward from the bottom wall of the end bracket 3.

  A fixing nut 9 is screwed into the pin-shaped terminal 8 outside the end bracket 3. The terminal member 7, the brush holder 5, and the insulating member 11 are arranged between the outward flange portion formed at the end in the axial direction inside the end bracket 3 of the pin-shaped terminal 8 and the fixing nut 9. By screwing, the terminal member 7, the brush holder 5, and the insulating member 11 are sandwiched so that the pin-like terminal 8 is fixed to the end bracket 3.

  Moreover, the bottomed cylindrical rotation prevention member 12 which has the cyclic | annular surrounding wall part which encloses the part which protrudes in the outward of the end bracket 3 in the pin-shaped terminal 8 is provided. The pin-like terminal 8 passes through the bottom of the rotation prevention member 12, and the bottom of the rotation prevention member 12 is sandwiched and fixed between the collar formed on the insulating member 11 and the end bracket 3.

  As shown in FIG. 2, the rotation-preventing member 12 has a bottomed cylindrical shape formed by a bottom 12b provided in the center with a hole 12a through which the pin-shaped terminal 8 passes, and a deformed hexagonal annular peripheral wall 12c. Is formed. A cable insertion recess 12d is provided in a portion corresponding to one side of the hexagonal shape in the annular peripheral wall portion 12c. The bottom portion 12b has a plurality of drain grooves 12e that are cut outward in the radial direction.

  The pin-shaped terminal 8 is connected to a power supply cable 13 as an external connection cable connected to a power supply circuit (not shown). A crimp terminal 14 is fixed to the end of the power supply cable 13. The crimp terminal 14 is fitted into the pin-shaped terminal 8, and a nut 15 is screwed into the male thread portion on the protruding side of the pin-shaped terminal 8, so that the crimp terminal 14 is pinned. The terminal 8 is fixed. As shown in the drawing, a terminal cover 16 according to the present invention is temporarily attached to the power supply cable 13 in advance.

  The terminal cover 16 may be formed of an insulating elastomer material. As shown in FIGS. 3 and 4, the terminal cover 16 has a bottomed tube having an inner peripheral surface shaped to match the outer shape (deformed hexagonal shape) of the rotation preventing member 12. And a tube-shaped portion 16b having an inner diameter through which the outer cover portion of the external connection cable 13 can be inserted in close contact. The cap portion 16 a is formed by integrally molding a top plate portion 16 c that covers the opening surface of the anti-rotation member 12 and a skirt portion 16 d that surrounds the annular peripheral wall portion 12 c of the anti-rotation member 12.

  The skirt portion 16d is formed to have a deformed hexagonal outer shape corresponding to the annular peripheral wall portion 12c. The illustrated skirt portion 16d is formed at the same height (depth) D from the bottom surface of the top plate portion 16a shown in FIG. Further, the size between the inner peripheral surfaces of the skirt portion 16d may be set so that the terminal cover 16 can be brought into close contact with the outer peripheral surface of the annular peripheral wall portion 12c with an elastic force when the terminal cover 16 is attached to the anti-rotation member 12. As a result, the terminal cover 16 is attached to the anti-rotation member 12 with an inwardly close contact force in the radial direction over the entire circumference, so that it does not come off with a small degree of vibration.

  In addition, as FIG. 4 shows, the part corresponding to the tubular part 16b in the skirt part 16d is formed as the 1st wall part 17a, and the opposite side is a symmetrical position of the 1st wall part 17a, and the 2nd wall part 17b. Both wall portions 17a and 17b are provided in parallel to each other. The annular peripheral wall portion 12c can be clamped between these wall portions 17a and 17b. FIG. 6 shows an enlarged cross-sectional view of a main part in a state where the feeding cable 16 is fixed to the pin-shaped terminal 8 by the nut 15.

  In the illustrated starter motor for a motorcycle or the like, the terminal cover 16 may come off when strong vibration is applied not only during traveling but also during transportation. Since the tube-shaped portion 16b integrated with the power supply cable 13 fixed to the pin-shaped terminal 8 can be regarded as a fixed state, as shown in FIG. 5, the second end is set with the height direction end A of the first wall portion 17a as a fulcrum. A force acts to remove the wall 17b side in the direction of arrow B.

  On the other hand, it is possible to resist the load in the detaching direction of the arrow B by sandwiching the annular peripheral wall portion 12c in the both wall portions 17a and 17b. In particular, by setting the wall thickness of the terminal cover 16 and the shape of the rib so as to increase the rigidity for maintaining the parallelism of the both wall portions 17a and 17b, it is possible to promote the difficulty of disengagement.

  Further, the deviation in the direction of the arrow B is a rotational motion centered on the fulcrum (A), and the rotational radius is R in FIG. On the other hand, when the radial maximum length L from the fulcrum (A) to the end in the height direction of the second wall portion 17b is close to the rotation radius R, the second wall portion 17b is easily detached from the annular peripheral wall portion 12c. On the other hand, specifically, the height D of both the wall portions 17a and 17b is the same, and since it is sufficiently deep, the radial maximum length L is sufficiently short with respect to the rotation radius R. The disengagement of 17b is prevented.

  Further, as shown in FIG. 7, radially outward outward projecting ribs 18 are provided on the annular peripheral wall portion 12 c over the entire circumference, and the terminal cover 16 is received in close contact with the outward projecting ribs 18. A circumferential groove 19 is provided which is formed in a size to be formed. The other parts may be the same as those in the above illustrated example, and the same reference numerals are given and detailed description thereof is omitted. Thereby, since the outward projecting rib 18 and the circumferential groove 19 are engaged with the detachment in the direction of the arrow B, the detachment can be further prevented.

1 is an overall view showing a main part of a starter motor for a motorcycle to which the present invention is applied, broken away. It is a top view which shows a rotation prevention member. It is a top view which shows a terminal cover. FIG. 4 is a cross-sectional view showing a terminal cover mounted state seen along the arrow IV-IV line in FIG. 3. It is explanatory drawing with respect to removal of a terminal cover. It is a principal part expanded sectional view which shows the connection state of an electric power feeding cable. It is a figure corresponding to FIG. 4 which shows a 2nd example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Starter motor 3 End bracket 8 Pin-shaped terminal 12 Anti-rotation member 12c Annular peripheral wall part 13 Feeding cable 14 Crimp terminal 16 Terminal cover 16a Cap part 16b Tubular part 17a First wall part 17b Second wall part 18 Outward protruding rib 19 Circumference Direction groove

Claims (3)

A pin-like terminal protruding from the outer surface of the starter motor and connected to an external connection cable, a detent member provided on the outer surface of the starter motor so as to surround the terminal, and the terminal coupled to the terminal A notch formed in a part of the detent member to pass an external connection cable, and a terminal cover provided with a cap-shaped top plate covering at least the upper opening surface of the detent member;
The terminal cover encloses a first wall portion formed integrally with the top plate portion so as to cover the notch portion, and a portion of the external connection cable that extends outward from the rotation preventing member. Therefore, the tube-shaped portion integrally formed with the first wall portion so as to protrude from the intermediate portion of the first wall portion with a predetermined length, and the detent member are held in close contact with the first wall portion. and said top plate portion and a second wall portion integrally formed so as to possess,
A starter motor provided with a terminal waterproof structure, wherein a wall surface provided with the notch portion of the rotation preventing member and a wall surface which closely contacts the second wall portion are parallel to each other .   2. The starter motor having a terminal waterproof structure according to claim 1, wherein the terminal cover has a wall portion provided over the entire circumference at the same height as the first wall portion. Ribs are provided on the outer circumferential surface of the anti-rotation member over the entire circumference,
The starter motor having a terminal waterproof structure according to claim 1, wherein a groove formed in an inner peripheral surface of the terminal cover is provided.

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