CN101420149B - The lead-out device of the connecting conductor of the starter - Google Patents

Abstract

The invention provides a lead-out device for a connecting conductor of a starter, which can prevent the deformation of the part of the connecting conductor sheath covering the connecting conductor to the insertion part of the casing, and can actively prevent water from entering the interior of the starter motor. The lead-out device (30) of the connecting conductor of the starter whose one end is inserted into the insertion hole (10) of the starter motor casing (3) and the other end is connected to the terminal of the magnetic switch includes: a connecting conductor sheath (31) , the connecting conductor sheath at least exposes both ends of the connecting conductor (22) and covers the connecting conductor (22), and between one end side of the connecting conductor (22) including the insertion part to the insertion hole (10) A cylindrical gap (36) opened on one end side is formed; and a bushing (35) is provided in the gap of the connection conductor sheath (31) to surround the connection conductor (22) to the insertion hole (10). The insertion part of the connecting conductor is pressurized toward the inner wall surface of the insertion hole (10).

Description

The lead-out device of the connecting conductor of the starter

technical field

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

Background technique

The existing lead wire assembly method of the starter is carried out by using the following structure when using the lead wire to connect the starter motor and the magnetic switch feeding it. The sleeve and the lead wire that cover the lead wire in a form that maintains a predetermined gap between the lead wire and the lead wire are integrated. The above-described lead wire assembly method further includes a step of inserting a bushing located away from the one end side through the starter motor casing to seal between the outer peripheral portion of the bushing and the insertion portion of the casing (see, for example, Patent Document 1).

At this time, the sleeve is made of a material such as rubber, and the part of the sleeve inserted into the housing is tightly fitted with the insertion part of the housing without leakage, so that the outer peripheral part of the sleeve and the insertion part of the housing are sealed. .

Patent Document 1: Japanese Patent Laid-Open No. 2002-262510

However, in the conventional starter lead wire assembly method, a gap is formed between the lead wire and the portion where the bushing of the case is inserted. Therefore, for example, due to aging, when a force intended to deform the portion of the sleeve inserted into the casing acts on the center of the bore of the sleeve, the sleeve is likely to deform toward the center of the bore. Therefore, the force with which the sleeve is pressed against the insertion portion of the housing due to the elastic force of the rubber is weakened, thereby reducing the liquid-tightness between the outer peripheral portion of the sleeve and the insertion portion of the housing. In the worst case, water will Get inside the starter motor.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a starter that can prevent the deformation of the connection conductor sheath (grommet) that covers the connection conductor to the insertion part of the housing, and can actively prevent water from entering the interior of the starter motor. Lead-out device for connecting conductors.

The lead-out device of the connecting conductor of the starter of the present invention is a connecting conductor of the starter whose one end is inserted into the insertion hole provided on the casing of the starter motor and connected to the inner conductor of the starter motor, and the other end is connected to the terminal of the magnetic switch. The lead-out device includes: a connecting conductor sheath, which at least exposes the terminals of the magnetic switch and the two ends of the connecting conductor connected to the inner conductor and covers the connecting conductor, and connects the connecting conductor including the insertion hole to the insertion hole. A cylindrical gap opened on one end side is formed between one end sides inside the part; It is arranged in the gap of the connecting conductor sheath to surround the insertion part of the connecting conductor to the insertion hole, and the shape of the pressing member is set to be larger than the gap between the connecting conductor and the connecting conductor sheath. The inner shape of the connection conductor sheath before the inside is large, and the pressing member provided in the gap between the connection conductor and the connection conductor sheath presses the connection conductor sheath toward the inner wall surface of the insertion hole.

According to the present invention, deformation of the sheath portion of the connecting conductor covering the insertion portion of the connecting conductor into the insertion hole of the case can be prevented, and water can be actively prevented from entering the interior of the starter motor.

Description of drawings

Fig. 1 is a front view of main parts of a starter having a lead-out device for a connecting conductor of the starter according to the present invention.

Fig. 2 is an exploded perspective view of the lead-out device of the connecting conductor and the surrounding of the sealing part of the connecting conductor sheath of the starter of the present invention.

3 is a cross-sectional view around the sealing portion of the connecting conductor sheath of the connecting conductor lead-out device of the starter according to the present invention.

Fig. 4 is a sectional view taken along the line IV-IV of Fig. 2 .

(Symbol Description)

1 starter

2 starter motors

3 shells

9 inner conductors

10 insertion holes

20 magnetic switch

22 connecting conductor

25 bolts (terminals)

30 Lead-out devices for connecting conductors

31 connection conductor sheath

35 bushing

36 gaps

Detailed ways

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

Fig. 1 is a front view of main parts of a starter having a lead-out device for a connecting conductor of the starter according to the present invention. Fig. 2 is an exploded perspective view of the lead-out device of the connecting conductor and the surrounding of the sealing part of the connecting conductor sheath of the starter of the present invention. 3 is a cross-sectional view around the sealing portion of the connecting conductor sheath of the connecting conductor lead-out device of the starter according to the present invention. Fig. 4 is a sectional view taken along the line IV-IV of Fig. 2 .

In FIGS. 1 to 4 , starter 1 has starter motor 2 , magnetic switch 20 , and lead-out device 30 for connecting conductors of the starter.

The magnetic switch 20 is used to feed power to the starter motor 2 and is installed at a predetermined position near the starter motor 2 . The starter motor 2 and the magnetic switch 20 are connected by a connection conductor 22, and the main part of the connection conductor 22 is covered by a connection conductor sheath 31 which will be described in detail later.

Hereinafter, the starter motor 2 will be described in detail.

The starter motor 2 has a housing 3 and an inner conductor 9 . The housing 3 includes a yoke 4, a front bearing frame 5A, and a rear bearing frame 5B.

The yoke 4 is cylindrical and includes a yoke fitting portion 4a and a yoke main body 4b. That is, as shown in FIG. 2 , the yoke 4 is formed to have a stepwise increase in thickness at a predetermined distance from one end in the axial direction to the other end, and the thinner portion constitutes the yoke fitting portion 4 a. In addition, although not shown in the figure, a yoke fitting portion similar to the yoke fitting portion 4a is also formed at the other axial end of the yoke 4 . The yoke main body 4b is composed of a thick portion between two yoke fitting portions.

At this time, the radial positions of the inner peripheral surfaces of the yoke fitting portion 4 a and the yoke main body 4 b are kept the same, and the radial positions of the respective outer peripheral surfaces are changed in a stepwise manner. The depth direction of the U-shaped notch recess 4c is consistent with the axial direction of the yoke 4, and is formed up to a part of the yoke fitting part 4a and the yoke main body 4b.

In addition, the front bearing frame 5A has a bottomed cylindrical shape, and the opening on one end side of the cylindrical body portion 6 is closed. The cylinder part 6 has the bearing frame fitting part 6a and the bearing frame main body 6b.

That is, as shown in FIG. 2, the wall thickness of the cylinder portion 6 is made stepwise from the other end in the axial direction to a predetermined distance from one end side, and the thinner portion forms the bearing frame fitting portion 6a, while the wall thickness The thick part constitutes the bearing frame main body 6b.

At this time, the radial positions of the outer peripheral surfaces of the bearing frame fitting portion 6a and the bearing frame main body 6b are kept the same, and the radial positions of the respective inner peripheral surfaces are changed in a stepwise manner.

In addition, a pair of positioning protrusions 7a, 7b are formed to face each other at a predetermined distance in the circumferential direction on the outer peripheral surface of the other end of the bearing frame main body 6b, and protrude radially.

And the yoke 4 is fitted with the front bearing frame 5A so that the outer peripheral surface of the yoke fitting part 4a is in close contact with the inner peripheral surface of the bearing frame fitting part 6a, and the notch concave part 4c and the positioning convex part 7a, 7b The positions correspond to the respective circumferential directions of the yoke 4 and the cylindrical portion 6 .

Also, the rear bearing frame 5B has the same shape as the front bearing frame 5A, and is fitted into 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 of the front bearing frame 5A opposite to the bottom of the notch recess 4c.

In addition, the inner conductor 9 is connected to an exciting coil arranged inside the yoke 4 (not shown), and is arranged inside the yoke 4 as shown in FIG. 3 .

Hereinafter, the lead-out device 30 of the connecting conductor of the starter will be described in detail.

In FIGS. 1 to 4 , the connection conductor lead-out device 30 of the starter has a connection conductor 22 , a connection conductor sheath 31 as a covering member, and a bush 35 as a pressurizing member.

First, the connection conductor 22 will be described in detail.

The connecting 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 its both ends are respectively reinforced by welding, and as shown in FIGS. 3 and 4 , a first terminal connection portion 23a and a second terminal connection portion 23b are formed.

In addition, the main circuit terminal portion 24 has a rectangular flat plate shape, and as shown in FIG. 4 , the second terminal connection portion 23b is connected to one surface of the main circuit terminal portion 24 on one end side in the longitudinal direction by welding. The bolt insertion hole 24 a is formed on the other end side of the main circuit terminal portion 24 in the longitudinal direction.

Furthermore, as will be described later, one end of the lead wire 23 is inserted into the insertion hole 10 to be drawn into the inside of the yoke 4, and the first terminal connection portion 23a is connected to the inner conductor 9 by welding.

In addition, as shown in FIG. 1 , one end of a bolt 25 serving as a power feeding terminal of the magnetic switch 20 protrudes outward from the case of the magnetic switch 20 . The bolt 25 is inserted through the bolt insertion hole 24 a of the main circuit terminal 24 outside the case of the magnetic switch 20 , and the main circuit terminal 24 is sandwiched by nuts 26 and 27 screwed to the bolt 25 . That is, the other end of the connection conductor 22 is connected to the power feeding terminal of the magnetic switch 20 .

Thereby, the starter motor 2 and the magnetic switch 20 are connected by the connecting conductor 22 .

Next, the connecting conductor sheath 31 will be described.

The connection conductor sheath 31 is made of rubber, and covers the connection conductor 22 in such a manner that only one end side of the lead wire 23 and the other end side of the main circuit terminal portion 24 are exposed. When forming the connection conductor sheath 31 with a die, the connection conductor 22 is insert-molded so that the connection conductor 22 and the connection conductor sheath 31 are integrally formed. At this time, as shown in FIG. 3 , between the lead wire 23 and the inner wall of the lead wire 23 are formed between the inner wall of the connecting conductor sheath 31 at a predetermined portion from one end to the insertion portion of the insertion hole 10 of the case 3 . Clearance 36. That is, a cylindrical gap opened on one end side of the connection conductor sheath 31 is formed between the connection conductor 22 (lead wire 23 ) and the connection conductor sheath 31 at one end side including the insertion portion to the insertion hole 10 . between. The part on the other end side of the connecting conductor sheath 31 is in close contact with the other end side of the main circuit terminal part 24 and the lead wire 23, so that water does not enter the inside of the connecting conductor sheath 31 from the other end side of the connecting conductor sheath 31. .

In addition, a connection conductor sheath sealing portion 32 is formed on one end side of the connection conductor sheath 31 .

The connecting conductor sheath sealing portion 32 has a sealing base portion 32a, a first extending sealing portion 32b, a second extending sealing portion 32c, and a sealing convex portion 32d.

In a state where the yoke 4 is fitted to the front bearing frame 5A, the seal base 32 a is fitted to the inner wall surface of the insertion hole 10 in a state of close contact.

At this time, the first protruding sealing portion 32b and the second protruding sealing portion 32c protrude from the sealing base 32a along the outer peripheral wall surface and the inner peripheral wall surface of the yoke 4 respectively, and form a gap with the yoke 4 together with the sealing base 32a. The first recess 34a fits in the area around the recess 4c. In addition, the portion of the seal base 32a opposite to the bottom of the notch recess 4c is cut to form a second recess 34b between the first protruding seal portion 32b and fit into the bearing frame fitting portion 6a. The sealing convex part 32d protrudes from the side of the 1st extension sealing part 32b toward the side of the front bearing frame 5A, and is arrange|positioned between the opposing wall surfaces of a pair of positioning convex part 7a, 7b in a state of close contact. The portion of the yoke 4 around the notch recess 4c that fits into the first recess 34a and the portion of the bearing frame fitting portion 6a that fits into the second recess 34b are respectively used as seal insertion portions 8a, 8b.

In addition, the bushing 35 is formed into a cylindrical shape using a rigid material such as iron. The bushing 35 surrounds the insertion portion of the lead wire 23 into the insertion hole 10 , and is inserted between the seal base 32 a and the lead wire 23 in such a manner that the inner wall of the seal base 32 a is pushed outward, that is, the inner wall surface of the insertion hole 10 is pressurized. In the gap 36 between. The outer diameter of the bushing 35 is larger than the inner diameter of the seal base 32a when no force is applied to the seal base 32a, whereby the mutual pressure between the seal base 32a and the inner wall surface of the insertion hole 10 is maintained stably.

Furthermore, as described above, one end side of the lead wire 23 is inserted into the insertion hole 10, exposed from the connection conductor sheath sealing portion 32 arranged to fit with the sealing insertion portions 8a, 8b, and arranged inside the yoke 4, the second The 1-terminal connection portion 23a is welded to the inner conductor 9 .

Hereinafter, a method of assembling the starter 1 will be described.

First, with respect to the integral part of the connection conductor 22 and the connection conductor sheath 31, insert the bush 35 into the gap 36 from the opening on one end side of the gap 36, and push it until it is accommodated by the seal base 32a. At this time, since the outer shape of the bush 35 is slightly larger than the inner shape of the seal base 32 , the seal base 32 is deformed radially outward of the bush 35 corresponding to the outer shape of the bush 35 .

Next, after the first terminal connection portion 23a and the inner conductor 9 are connected by welding, the seal base portion 32a is fitted into the notch recess portion 4c. Thereby, the seal insertion part 8a will be in the state fitted with the 1st recessed part 34a. Then, the opening of the front bearing frame 5A is directed to the opening on the one end side of the yoke 4, and the front bearing frame 5A is rotated around the axis so that the sealing protrusion 32d is disposed between the pair of positioning protrusions 7a, 7b in the circumferential direction, And the bearing frame fitting part 6a is fitted with the yoke fitting part 4a, so that the sealing convex part 32d is in close contact with the positioning convex parts 7a, 7b. Thereby, the seal insertion part 8b will be in the state fitted with the 2nd recessed part 34b.

Then, the rear bearing frame 5B 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 loosely fitted through the protruding piece 5a protruding radially outward from the rear bearing frame 5B, and then the front end of the through bolt 37 is connected to the forward bearing frame. The protruding piece (not shown in the figure) protruding radially outward of 5A is screwed together. As a result, the front bearing frame 5A and the rear bearing frame 5B tighten each other in the form of pressurizing the yoke 4 from both ends in the axial direction, and hold the housing 3 stably. Since the inner wall surface of the insertion hole 10 is pressurized, the seal base 32a and the inner wall surface of the insertion hole 10 can be stably held in a state of being pressed against each other. Through the above steps, the assembly work of the starter motor 2 is completed.

Then, the magnetic switch 20 is arranged at a predetermined position near the starter motor 2 , and the bolt 25 is inserted through the bolt insertion hole 24 a formed in the main circuit terminal portion 24 . Next, the main circuit terminal portion 24 is screwed and fixed with the nut 26, and the assembly work of the starter 1 is completed.

In the present invention, the conductor sheath 31 is connected so that the bolt 25 serving as the power feeding terminal of the magnetic switch 20 and both ends of the connection conductor 22 connected to the inner conductor 9 (the other end of the main circuit terminal portion 24 and one end of the lead wire 23) The exposed form covers the connection conductor 22 . Further, the bushing 35 is inserted into the gap 36 between the seal base 32 a and the lead wire 23 so as to surround the insertion portion of the lead wire 23 into the insertion hole 10 of the housing 3 . Since the rigid bushing 35 presses the seal base 32a toward the inner wall surface of the insertion hole 10, the seal base 32 and the inner wall surface of the insertion hole 10 are stably held in a state of being pressed against each other. Accordingly, the shape of the seal base 32a is stably held without deformation, and the pressurized state between the seal base 32a and the inner wall surface of the insertion hole 10 does not change over time. In addition, when the first terminal connection portion 23a on the one end side of the lead wire 23 is welded to the internal conductor 9, bending processing or the like is performed so that the one end side of the lead wire 23 corresponds to the position of the internal conductor 9, even if the The shape of the sealing base 32a remains unchanged due to the force of the deformation of the sealing base 32a.

Therefore, it is possible to actively prevent moisture from entering the interior of the starter motor 2 from the portion where the lead wire 23 is inserted into the housing 3 .

In addition, the connection conductor 22 is insert-molded in the connection conductor sheath 31 so that the other end side of the main circuit terminal portion 24 and the intermediate portion of the lead wire 23 is closely surrounded by the connection conductor sheath 31 . Therefore, it is not necessary to carry out a process for ensuring the liquid-tightness of the other end of the connecting conductor sheath 31 in another process, and it is possible to prevent the water from entering the connecting conductor sheath 31 from the other end side of the connecting conductor sheath 31 smoothly. The lead wire 23 enters the inside of the housing 3 .

In addition, in the above-mentioned embodiment, the structure in which the connecting conductor sheath seal portion 32 is fitted to the seal insertion portions 8a, 8b using the insertion hole 10 formed when the yoke 4 is fitted to the front bearing frame 5A has been described. However, the connecting conductor sheath sealing portion 32 can also be fitted with other insertion holes formed on a predetermined portion of the wall surface of the housing 3 with the wall around the insertion hole.

In addition, as the bushing 35, the structure in which the connecting conductor 22 is insert-molded in the connecting conductor sheath 31 and then the bushing 35 is pushed to the position of the sealing base 32a has been described, but the bushing 35 may also be placed The connecting conductor 22 is arranged integrally with the portion of the sealing base 32 a when the connecting conductor sheath 31 is insert-molded. Thereby, forgetting to insert the bush 35 into the gap 36 can be prevented.

In addition, the bushing 35 as the pressurizing member is made into an iron cylinder and is arranged in the gap 36 to pressurize the inner wall surface of the sealing base 32a and the insertion hole 10 of the housing 3. However, the pressurizing member is not limited to the cylindrical bush 35 made of iron, and any material and shape may be used as long as it can maintain the pressurized state between the seal base 32a and the inner wall surface of the insertion hole 10 .

For example, the bush 35 may be made of metal such as brass or copper, or rigid resin such as phenol, other than iron. However, if the bush 35 is made of iron, it can be widely used, and the lead-out device 30 for the connection conductor of the starter can be configured at low cost. In addition, if the bush 35 is formed into a cylindrical shape having the same outer shape as that of the gap 36 , it becomes easy to insert the bush 35 into the gap 36 .

Furthermore, if the bushing 35 is made into a cylindrical shape having the same outer shape as the inner peripheral shape of the insertion hole 10, the seal base 32a will uniformly press the inner wall surface of the insertion hole 10 over the entire wall surface, so that the inner wall surface of the insertion hole 10 can be further stabilized. The pressurized state between the seal base 32a and the insertion hole 10 is maintained reliably. Accordingly, the liquid-tightness between the seal base 32 a and the inner wall surface of the insertion hole 10 can be maintained in a more stable state.

In addition, the connection conductor sheath 31 has been described as being made of rubber, but the connection conductor sheath 31 is not limited to being made of rubber, and may be made of an elastic material such as nylon or polypropylene.

In addition, the connection conductor 22 and the connection conductor sheath 31 have been insert-molded in such a manner that the other end side of the connection conductor sheath 31 closely surrounds the main circuit terminal portion 24 and the other end side of the lead wire 23. The integrally formed structure is described. However, the connection conductor 22 and the connection conductor sheath 31 may be integrally formed in such a manner that at least a part of the connection conductor 22 on the other end side of the insertion hole 10 is closely surrounded by the connection conductor sheath 31. . Thus, the passage between the gap 36 and the other end side of the connecting conductor sheath 31 can be cut off, and water entering the connecting conductor sheath 31 from the other end side of the connecting conductor sheath 31 can be easily prevented from penetrating into the housing 3 through the gap 36. internal.

The connection conductor 22 has been described so that the other end of the main circuit terminal part 24 and the other end of the middle part of the lead wire 23 is tightly surrounded by the connection conductor sheath 31. The structure is embedded in the connection conductor sheath 31, but as long as the connection At least a part of the main circuit terminal portion 24 and the lead wire 23 on the other end side of the conductor 22 than the insertion portion into the insertion hole 10 is closely surrounded by the connection conductor sheath 31 .

Claims (3)

1. the ejector of the bonding conductor of a starter, an end are inserted in the patchhole that the starting motor shell is provided with and are connected with the inner conductor of this starting motor, and the other end is connected with the terminal of magnetic switch, it is characterized in that, comprising:

The bonding conductor sheath, this bonding conductor sheath makes the two ends of the terminal of described magnetic switch and the described bonding conductor that is connected with described inner conductor expose at least and covers this bonding conductor, and this bonding conductor comprise that leading to one of position to described patchhole slotting is formed with the tubular gap of side opening at one end between distolateral; And

Pressing element, this pressing element is made the tubular with profile identical with interior all shapes of described patchhole, this pressing element is arranged in the described gap between described bonding conductor and the described bonding conductor sheath, with around described bonding conductor to the logical position of inserting of described patchhole

The profile of described pressing element is configured to bigger than the interior shape of the described bonding conductor sheath before in the described gap that described pressing element is arranged between described bonding conductor and the described bonding conductor sheath, and the described pressing element that is arranged in the described gap between described bonding conductor and the described bonding conductor sheath pressurizes to the internal face of described bonding conductor sheath towards described patchhole.

2. the ejector of the bonding conductor of starter as claimed in claim 1 is characterized in that, described pressing element is by having the metal of rigidity.

3. the ejector of the bonding conductor of starter as claimed in claim 1 or 2, it is characterized in that, described bonding conductor and described bonding conductor sheath are shaped integratedly, so that center on than more being close to by described bonding conductor sheath by at least a portion of another distolateral described bonding conductor to the logical position of inserting of described patchhole.

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