JP2009112068A - Leading device of connection conductor of starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leading device of a connection conductor of a starter, preventing moisture from entering the inside of a starter motor by preventing the deformation of a portion of a grommet for covering a portion of the connection conductor inserting into a housing. <P>SOLUTION: The leading device 30 of a connection conductor of a starter has a structure in which one end is inserted into an insertion hole 10 provided on a housing 3 of the starter motor and the other end is coupled to a terminal of a magnet switch. The leading device 30 is provided with: a grommet 31 in which at least both ends of the connection conductor 22 are exposed to cover the connection conductor 22 and a cylindrical gap 36 provided on the one end is formed between the one end including the insertion portion to the insertion hole 10 of the connection conductor 22 and the other end; and a bush 35 disposed on the gap of the grommet 31 so as to surround the insertion portion to the insertion hole 10 of the connection conductor 22, and pressurizing the grommet 31 toward the inner wall surface of the insertion hole 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lead-out device for a connection conductor of a starter used for connecting a starter motor and a magnet switch, and more particularly to a waterproof structure between the starter motor and the connection conductor.

The conventional method for assembling the lead wire of the starter is to connect the starter motor and the magnet switch that supplies power to the starter motor with the lead wire, and attach the lead wire to one end of the lead wire and lead the lead at a portion away from the one end of the lead wire. The sleeve that covers the wire with a predetermined gap is formed using a structure integrally formed with the lead wire, and the sleeve on the side farther from the one end side is inserted into the housing of the starter motor, and the sleeve There is a step of sealing between the outer peripheral portion of the housing and the insertion portion of the housing (for example, see Patent Document 1).
At this time, rubber or the like is used for the material of the sleeve, and the portion of the sleeve inserted into the housing is fluid-tightly fitted into the insertion portion of the housing, so that there is a gap between the outer periphery of the sleeve and the insertion portion of the housing. It was sealed.

JP 2002-262510 A

However, in the conventional starter lead wire assembling method, a gap is formed between the portion of the sleeve inserted into the housing and the lead wire. For this reason, for example, when a force to deform the portion of the sleeve inserted through the housing is exerted toward the hole center of the sleeve due to secular change, the sleeve is easily deformed toward the hole center side. End up.
Therefore, since the force with which the sleeve tries to press the insertion portion of the housing is weakened by the elastic force of the rubber, the liquid tightness between the outer peripheral portion of the sleeve and the insertion portion of the housing is reduced, and in the worst case, the starter motor There was a risk of moisture getting inside.

  The present invention has been made to solve the above-described problem, and prevents deformation of the grommet portion covering the insertion portion of the connection conductor to the housing, thereby preventing moisture from entering the starter motor. An object of the present invention is to obtain a lead-out device for a connecting conductor of a starter that can be prevented in advance.

  The starter connecting conductor lead device according to the present invention has one end inserted into an insertion hole provided in the starter motor housing and connected to the internal conductor of the starter motor, and the other end connected to the terminal of the magnet switch. A connecting conductor outlet device, at least both ends of the connecting conductor connected to the magnet switch terminal and the inner conductor are exposed to cover the connecting conductor, and a cylindrical gap opened at one end is inserted into the connecting conductor. A grommet formed between the grommet formed between the one end side including the insertion site for the hole and the insertion site for the insertion hole of the connecting conductor is disposed in the grommet gap, and the grommet is added to the inner wall surface of the insertion hole. And a pressure member for pressing.

  According to the present invention, it is possible to prevent the grommet part covering the insertion part of the connecting conductor through the insertion hole of the housing from being deformed, and to prevent moisture from entering the starter motor.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a front view of a main part of a starter having a lead conductor connecting device for a starter according to the present invention. FIG. 2 is an exploded perspective view of the starter connecting conductor lead device and grommet seal portion according to the present invention. 3 is a cross-sectional view of the periphery of the grommet seal portion of the lead conductor connecting device of the starter according to the present invention, and FIG.

1 to 4, the starter 1 includes a starter motor 2, a magnet switch 20, and a starter connecting conductor outlet device 30.
The magnet switch 20 is for supplying power to the starter motor 2, and is disposed at a predetermined position in the vicinity of the starter motor 2. The starter motor 2 and the magnet switch 20 are connected by a connection conductor 22 whose main part is covered with a grommet 31 described later in detail.

Next, details of the starter motor 2 will be described.
The starter motor 2 has a housing 3 and an internal conductor 9. The housing 3 includes a yoke 4, a front bracket 5A, and a rear bracket 5B.

  The yoke 4 is formed in a cylindrical shape and includes a yoke fitting portion 4a and a yoke main portion 4b. That is, as shown in FIG. 2, the yoke 4 is formed so that the wall thickness increases in a step shape at a predetermined distance from one end to the other end in the axial direction. The thin portion constitutes the yoke fitting portion 4a. Further, although not shown, a yoke fitting portion similar to the yoke fitting portion 4a is formed on the other end side in the axial direction of the yoke 4, and the yoke main portion 4b is formed on the wall between the two yoke fitting portions. It is comprised by the thick part.

  At this time, the radial positions of the inner peripheral surfaces of the yoke fitting portion 4a and the yoke main portion 4b coincide with each other, and the radial positions of the outer peripheral surfaces change in a step shape. The U-shaped notch recess 4 c is formed with the depth direction of the recess aligned with the axial direction of the yoke 4 so as to reach a part of the yoke fitting portion 4 a and the yoke main portion 4 b.

The front bracket 5A is formed in a bottomed cylindrical shape in which an opening on one end side of the cylindrical body portion 6 is closed. Furthermore, the cylindrical body portion 6 is constituted by a bracket fitting portion 6a and a bracket main portion 6b.
That is, as shown in FIG. 2, the cylindrical portion 6 is formed so that the wall thickness increases in a step shape at a predetermined distance from the other end in the axial direction to one end side. The thin part constitutes the bracket fitting part 6a, and the thick part of the wall constitutes the bracket main part 6b.
At this time, the radial positions of the outer peripheral surfaces of the bracket fitting portion 6a and the bracket main portion 6b coincide with each other, and the radial positions of the respective inner peripheral surfaces change in a step shape.
Further, the pair of positioning convex portions 7a and 7b are formed so as to be opposed to the outer peripheral surface on the other end side of the bracket main portion 6b with a predetermined distance in the circumferential direction and to protrude in the radial direction. .

The yoke 4 and the front bracket 5A are arranged such that the outer peripheral surface of the yoke fitting portion 4a is in close contact with the inner peripheral surface of the bracket fitting portion 6a, and the positions of the notch concave portion 4c and the positioning convex portions 7a and 7b. Are fitted so as to correspond to the respective circumferential directions of the yoke 4 and the cylindrical portion 6.
The rear bracket 5B has the same shape as the front bracket 5A and is fitted to the yoke fitting portion on the other end side of the yoke 4. At this time, the insertion hole 10 is formed by the notch recess 4c and the other end portion of the front bracket 5A facing the bottom of the notch recess 4c, and the insertion hole 10 is excluded between the inside and the outside of the housing 3. Is blocked.

  Further, the internal conductor 9 is connected to a field winding disposed inside the yoke 4 (not shown), and is disposed inside the yoke 4 as shown in FIG.

Next, details of the lead-out device 30 for the connection conductor of the starter will be described.
1 to 4, the starter connection conductor outlet device 30 includes a connection conductor 22, a grommet 31 as a covering member, and a bush 35 as a pressure member.
First, the details of the connection conductor 22 will be described.
The connection conductor 22 has a lead wire 23 and a main circuit terminal portion 24. The lead wire 23 is made of a copper stranded wire, and both ends thereof are hardened by welding to constitute a first terminal connection portion 23a and a second terminal connection portion 23b as shown in FIGS. .
The main circuit terminal portion 24 is formed in a rectangular flat plate shape, and the second terminal connection portion 23b is connected to one surface in the longitudinal direction of the main circuit terminal portion 24 by welding as shown in FIG. Yes. A bolt insertion hole 24 a is formed on the other end side in the longitudinal direction of the main circuit terminal portion 24.

As will be described later, one end of the lead wire 23 is inserted into the insertion hole 10 and drawn into the yoke 4, and the first terminal connection portion 23 a is connected to the internal conductor 9 by welding.
Further, as shown in FIG. 1, one end of a bolt 25 as a current supply terminal of the magnet switch 20 extends from the housing of the magnet switch 20 to the outside. The bolt 25 is inserted into the bolt insertion hole 24 a of the main circuit terminal portion 24 described above outside the housing of the magnet switch 20, and the main circuit terminal portion 24 is nuts 26 and 27 screwed to the bolt 25. It is pinched by. That is, the other end of the connection conductor 22 is connected to the current supply terminal of the magnet switch 20.
Thereby, the connection conductor 22 connects between the starter motor 2 and the magnet switch 20.

Next, the grommet 31 will be described.
The grommet 31 is made of rubber and is formed so as to cover only the one end side of the lead wire 23 and the other end side of the main circuit terminal portion 24 to cover the connection conductor 22. When the grommet 31 is molded, the connection conductor 22 is insert-molded, and the connection conductor 22 and the grommet 31 are integrated. At this time, as shown in FIG. 3, a cylindrical gap 36 is formed between the inner wall from the one end of the grommet 31 to the other end side of the insertion portion into the insertion hole 10 of the housing 3 to the predetermined portion and the lead wire 23. It is formed between. That is, a cylindrical gap that opens to one end side of the grommet 31 is formed between the grommet 31 and a portion on one end side including a portion where the connection conductor 22 (lead wire 23) is inserted into the insertion hole 10. The part on the other end side of the grommet 31 is in a close contact state so as to surround the other end side of the main circuit terminal portion 24 and the lead wire 23, and water enters the grommet 31 from the other end side of the grommet 31. There is no intrusion.

A grommet seal portion 32 is formed on one end side of the grommet 31.
The grommet seal portion 32 includes a seal base portion 32a, a first extended seal portion 32b, a second extended seal portion 32c, and a seal convex portion 32d.
The seal base portion 32a is closely fitted to the inner wall surface of the insertion hole 10 in a state where the yoke 4 and the front bracket 5A are fitted.

  At this time, each of the first extended seal portion 32b and the second extended seal portion 32c extends from the seal base portion 32a along the outer peripheral wall surface and the inner peripheral wall surface of the yoke 4, and the yoke 4 is cut. A first recess 34a is formed in cooperation with the seal base 32a to be fitted to a portion around the notch recess 4c. Further, the portion of the seal base 32a opposite to the bottom of the notch recess 4c is cut so as to form a second recess 34b between the first extension seal portion 32b and the bracket fitting portion 6a. It is mated. Further, the seal convex portion 32d protrudes from the first extending seal portion 32b side to the front bracket 5A side, and is disposed in a close contact state between the opposing wall surfaces of the pair of positioning convex portions 7a and 7b. The portion of the yoke 4 around the notch recess 4c fitted to the first recess 34a and the portion of the bracket fitting portion 6a fitted to the second recess 34b are referred to as seal insertion portions 8a and 8b, respectively.

The bush 35 is formed in a cylindrical shape from a material having rigidity such as iron. The bush 35 surrounds the insertion portion of the lead wire 23 into the insertion hole 10 and presses the inner wall of the seal base portion 32a outward, in other words, pressurizes the inner wall surface of the insertion hole 10. Are inserted into the gap 36 between the seal base 32 a and the lead wire 23. The outer diameter of the bush 35 is larger than the inner diameter of the seal base portion 32a when no force is applied to the seal base portion 32a, so that the seal base portion 32a and the inner wall surface of the insertion hole 10 are pressurized with each other. Is held stably.
As described above, one end side of the lead wire 23 is inserted into the insertion hole 10 and is exposed from the grommet seal portion 32 disposed so as to be fitted to the seal insertion portions 8a and 8b and disposed inside the yoke 4. The first terminal connection portion 23 a is welded to the inner conductor 9.

Next, assembly of the starter 1 will be described.
First, the bush 35 is inserted into the gap 36 from the opening on one end side of the gap 36 and pushed into the integrally formed product of the connection conductor 22 and the grommet 31 until it is disposed at a position included in the seal base 32a. At this time, since the outer shape of the bush 35 is formed to be slightly larger than the inner shape of the seal base portion 32 a, the seal base portion 32 a is deformed toward the radially outer side of the bush 35 according to the outer shape of the bush 35.

  Next, after the first terminal connection portion 23a is connected to the internal conductor 9 by welding, the seal base portion 32a is fitted into the notch recess 4c. As a result, the seal insertion portion 8a is fitted into the first recess 34a. Further, the front bracket 5A is turned around the front bracket 5A so that the opening of the front bracket 5A faces the opening on one end side of the yoke 4 and the seal convex portion 32d is disposed between the pair of positioning convex portions 7a and 7b in the circumferential direction. The bracket fitting portion 6a and the yoke fitting portion 4a are fitted so that the seal convex portion 32d is in close contact with the positioning convex portions 7a and 7b. Thereby, the seal insertion portion 8b is fitted into the second recess 34b.

  Next, the rear bracket 5 </ b> B is fitted to the other end side of the yoke 4. Although not described in detail, as shown in FIG. 1, the through bolt 37 is inserted through the projecting piece 5 a that protrudes radially outward from the rear bracket 5 </ b> B in a loosely fitted state. The tip is screwed into a protruding piece (not shown) protruding outward in the radial direction of the front bracket 5A. Accordingly, the front bracket 5A and the rear bracket 5B are attracted to each other so as to press the yoke 4 from both ends in the axial direction, and the housing 3 is stably held. At this time, the bush 35 inserts the seal base 32a into the insertion hole 10. Since the inner wall surface is pressurized, the seal base 32a and the inner wall surface of the insertion hole 10 are stably held so as to pressurize each other. Thus, the assembly of the starter motor 2 is completed.

  Next, the magnet switch 20 is disposed at a predetermined position near the starter motor 2, and the bolt 25 is inserted into the bolt insertion hole 24 a formed in the main circuit terminal portion 24. Then, the assembly of the starter 1 is completed by fastening and fixing the main circuit terminal portion 24 with the nut 26.

In the present invention, the grommet 31 has both ends of the connection conductor 22 connected to the bolt 25 and the internal conductor 9 as the current supply terminals of the magnet switch 20 (the other end of the main circuit terminal portion 24 and one end of the lead wire 23). Is formed so as to cover the connection conductor 22. The bush 35 is inserted into a gap 36 between the seal base 32 a and the lead wire 23 so as to surround a portion where the lead wire 23 is inserted into the insertion hole 10 of the housing 3. The rigid bush 35 pressurizes the seal base 32 a against the inner wall surface of the insertion hole 10, so that the seal base 32 a and the inner wall surface of the insertion hole 10 are stably held in a state where they are pressurized with each other. Thereby, the seal base 32a is stably maintained without its shape being deformed, and the pressurization state between the seal base 32a and the inner wall surface of the insertion hole 10 does not change due to secular change or the like. Further, when the first terminal connection portion 23a on one end side of the lead wire 23 is welded to the inner conductor 9, the one end side of the lead wire 23 is bent to correspond to the position of the inner conductor 9, etc. Even if a force for deforming the seal base 32a is applied, the shape of the seal base 32a does not change.
Therefore, it is possible to prevent moisture from entering the starter motor 2 from the portion where the lead wire 23 is inserted into the housing 3.

  Further, the connection conductor 22 is insert-molded in the grommet 31 so that the other end side of the main circuit terminal portion 24 and the intermediate portion of the lead wire 23 is surrounded in close contact with the grommet 31. Therefore, moisture that has entered the grommet 31 from the other end side of the grommet 31 passes through the lead wire 23 without performing a process for ensuring the liquid-tightness of the other end portion of the grommet 31 in a separate process. Intrusion into the housing 3 can be prevented.

In the above embodiment, the grommet seal portion 32 is fitted to the seal insertion portions 8a and 8b using the insertion hole 10 formed when the yoke 4 and the front bracket 5A are fitted. As described above, the grommet seal portion 32 may be fitted to a wall portion around another insertion hole with respect to another insertion hole formed in a predetermined portion of the wall of the housing 3, for example.
Further, the bush 35 has been described as being formed by inserting the connecting conductor 22 into the grommet 31 and then pushing the connecting conductor 22 to the portion of the seal base 32a. However, the bush 35 is sealed when the connecting conductor 22 is inserted into the grommet 31. It may be arranged integrally with the portion of the base 32a. As a result, forgetting to insert the bush 35 into the gap 36 can be prevented.

Further, the bush 35 as the pressurizing member is formed in an iron cylindrical shape and is described as being disposed in the gap 36 so as to pressurize the seal base 32a and the inner wall surface of the insertion hole 10 of the housing 3. The member is not limited to the iron cylindrical bush 35, and any material and shape may be used as long as the pressurized state between the seal base 32a and the inner wall surface of the insertion hole 10 is maintained.
For example, the bush 35 may be formed of a metal such as brass or copper, or a resin having rigidity such as phenol, in addition to iron. However, if the bush 35 is made of iron, it is widely used, so that the starter connecting conductor extraction device 30 can be configured at low cost. Further, if the bush 35 is formed in a cylindrical shape having the same outer shape as the outer shape of the gap 36, the bush 35 can be easily inserted into the gap 36.

  Further, if the bush 35 is formed in a cylindrical shape having the same outer shape as the inner peripheral shape of the insertion hole 10, the seal base 32 a uniformly pressurizes the inner wall surface of the insertion hole 10 over the entire area. The pressurized state between the seal base 32a and the insertion hole 10 is further stably maintained. Thereby, the liquid-tightness between the seal base 32a and the inner wall surface of the insertion hole 10 can be maintained in a more stable state.

  Moreover, although the grommet 31 was demonstrated as what is formed with rubber | gum, the grommet 31 is not limited to what is formed with rubber | gum, You may form with the material which has elasticity, such as nylon and a polypropylene.

  Further, the connecting conductor 22 and the grommet 31 are integrally formed by insert molding so that the other end side of the grommet 31 is in close contact with the other end side of the main circuit terminal portion 24 and the lead wire 23. As explained. However, the connection conductor 22 and the grommet 31 may be integrally formed so that at least a part of the connection conductor 22 on the other end side from the insertion hole 10 is closely surrounded by the grommet 31. Thereby, the path between the gap 36 and the other end side of the grommet 31 is blocked, and it is easy for water that has entered the grommet 31 from the other end side of the grommet 31 to enter the inside of the housing 3 through the gap 36. Can be prevented.

  The connection conductor 22 has been described as being insert-molded in the grommet 31 so that the other end side of the intermediate portion between the main circuit terminal portion 24 and the lead wire 23 is in close contact with the grommet 31, but the connection conductor 22 is inserted. It suffices that at least a part of the main circuit terminal portion 24 and the lead wire 23 on the other end side from the insertion portion into the hole 10 is surrounded by the grommet 31 in a close state.

It is a principal part front view of the starter which has the lead-out device of the connection conductor of the starter concerning this invention. It is a disassembled perspective view around the lead-out device and the grommet seal portion of the starter connection conductor according to the present invention. It is sectional drawing of the grommet seal | sticker part periphery of the lead-out device of the connection conductor of the starter which concerns on this invention. FIG. 4 is a cross-sectional view taken along arrow IV-IV in FIG. 2.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Starter, 2 Starter motor, 3 Housing, 9 Inner conductor, 10 Insertion hole, 20 Magnet switch, 22 Connection conductor, 25 Bolt (terminal), 30 Connecting conductor outlet device, 31 Grommet, 35 Bush (Pressurizing member) 36 Clearance.

Claims (5)

One end is inserted into an insertion hole provided in the housing of the starter motor and connected to the inner conductor of the starter motor, and the other end is a lead conductor connecting device connected to a terminal of the magnet switch,
At least both ends of the connection conductor connected to the terminal of the magnet switch and the internal conductor are exposed to cover the connection conductor, and a cylindrical gap opened on one end side is inserted into the insertion hole of the connection conductor A grommet formed between one end side including the site;
A pressure member disposed in the gap of the grommet so as to surround the insertion portion of the connection conductor into the insertion hole, and pressurizing the grommet against the inner wall surface of the insertion hole;
A lead conductor connecting device for a starter, comprising:   2. The starter connecting conductor outlet device according to claim 1, wherein the pressure member is formed in a cylindrical shape having an outer shape identical to the outer shape of the gap.   The starter connecting conductor outlet device according to claim 1, wherein the pressure member is formed in a cylindrical shape having an outer shape that is the same as the inner peripheral shape of the insertion hole.   The lead-out device for a connection conductor of a starter according to any one of claims 1 to 3, wherein the pressure member is made of iron.   The connection conductor and the grommet are integrally formed so that at least a part of the connection conductor on the other end side of the insertion portion into the insertion hole is closely surrounded by the grommet. The lead-out device for the connection conductor of the starter according to any one of claims 1 to 4.

Images