JPH0537654Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is particularly applicable to connection lugs in brush holders of vehicle generators in which serrated terminal bolts with a large pressing force are fitted and connected to the lugs. This relates to the mounting structure.

[Prior art and problems to be solved by the invention] In general, alternators for vehicles
In this case, it is necessary to form a brush holder for accommodating brushes that slides into contact with a slip ring provided on the rotating shaft.
In such a brush holder, a holder body into which the brush is removably mounted, a bolt insertion portion protruding from both sides of the holder body, and a lug to which a pigtail attached to the brush is connected. It has been proposed that the brush holder be integrally formed using an insulating resin in a state where the brush holder is embedded, and that the brush holder can be firmly fixed and supported via a bolt inserted through a bolt insertion portion.

By the way, when doing this, one of the bolts can be effectively used as a terminal, thereby simplifying the structure and reducing the number of parts, and electrically connecting the lug and the terminal bolt. In this case, in order to complete the electrical connection between the lug and the terminal bolt, the terminal fitting part of the terminal bolt formed on this lug is provided so as to be exposed on the end surface of the bolt insertion part. In addition, if the serrations cut into the terminal bolt are press-fitted into the fitting hole drilled in the terminal fitting part, the load during this press-fitting and the radial direction of the terminal fitting part will be reduced. There are problems such as the resin of the brush holder that holds the lugs broken or cracked due to the expansion and deformation of the lugs, and the lugs peeling off from the resin, which needs to be improved. Yes.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention has been devised for the purpose of providing a mounting structure for a connecting lug in a brush holder of a vehicle generator, which can eliminate these drawbacks. A brush holder for a vehicle generator for accommodating a brush that slides into contact with a slip ring provided on the rotating shaft side,
The brush holder includes a holder body into which a pair of brushes is mounted so as to be freely retractable, and bolt insertion portions protruding from both sides of the holder body, which are integrally formed using an insulating resin. Furthermore, a pair of lugs are embedded in the insulating resin to which the pair of pigtails implanted in each of the brushes are respectively connected, and further, one of these lugs is connected to the bolt insertion portion. conductive to the terminal bolt to be inserted, with a pigtail joint at one end of the lug protruding into the holder body;
The terminal fitting part, which is electrically connected to the terminal bolt, which is the other end of the lug, has an outer circumferential shape that is a wide plate that is approximately the same shape as the outer circumferential shape of the end of the bolt insertion part, and is exposed on the end surface of the bolt insertion part. The insulating resin of the brush holder is formed with a notch into which the insulating resin of the brush holder is fitted like a dovetail groove, and the serration formed on the outer circumferential surface of the terminal bolt is press-fitted into the center of the terminal fitting part. It is characterized by having a fitting hole formed therein.

With this configuration, the present invention is capable of reliably preventing cracking of the insulating base even when a terminal that has been subjected to a serration process is press-fitted.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, 1 is an alternator for a vehicle, and the generator 1 includes a rotor core 3 that is press-fitted and fixed to a core shaft 2, a coil bobbin 4 provided inside the rotor core 3, and a coil bobbin 4 that is wound around the coil bobbin 4. be done. A rotor coil 5, a stator 6 around which a stator coil 6a is wound, a brush 8 housed in a brush holder 7 (described later), a slip ring 9 with which the brush 8 comes into sliding contact in an elastic manner, and a stator 6 that is integrally fixed to the side surface of the rotor core 3. The components such as the cooling fan 10 that rectifies the generated alternating current, and the rectifier 11 that rectifies the generated alternating current are all the same as before. The outer shell is integrally constituted by a two-piece case structure including a front case 12 and a rear case 12a.

The brush holder 7 is integrally formed of an insulating resin material, and a pair of terminal bolts 1 which also serve as bolts, which will be described later, are connected to the support body 13.
A holder main body 7a which is detachably fixed by 6 and 18 and is mounted with a pair of brushes 8 removably retractable; Bolt insertion part 7
b, 7c. The present invention is implemented in one of the bolt insertion parts 7b and 7c. That is, a pair of corresponding lugs 14 and 15 are buried in each of the bolt insertion portions 7b and 7c, and one of these lugs 14 and 15 is buried in one of the bolt insertion portions 7b. 14 is as follows.

In other words, this one lug 14 is basically
A pigtail connecting portion 14a where a pigtail 8a extending from one brush 8 of the bullet is connected to the holder body 7a by welding, and a terminal fitting portion 14c to be described later.
, the pigtail coupling part 14a and the terminal fitting part 1
4c, these both parts 14a, 14c
It has a connecting part 14b that connects the
Then, it is integrally formed by press working, and to explain the details, as shown in FIG. The notch 14d and the part corresponding to the fitting hole 14e are punched out into a shape, and the part corresponding to the connecting part 14b is punched out at a substantially right angle to the A position when the part corresponding to the connecting part 14b is used as a reference. The lug 14 is folded into the shape shown in FIG. will be formed. And the terminal fitting portion 14c
The brush holder 7 is formed in a substantially cylindrical shape, and has a wide disc shape having approximately the same diameter as the outer diameter of one end of the bolt insertion portion 7b, and also has a notch on its outer periphery. 14d are formed at positions facing each other, and a fitting hole 14e is formed in the center portion into which a serration 16a of a terminal (terminal bolt) 16 which also serves as a fixing bolt is press-fitted. Moreover, the terminal fitting portion 14c is exposed on the end surface of one bolt insertion portion 7b, and is integrally attached with the resin material fitted into the notch 14d in a dovetail groove fit. Then, the terminal bolt 16 is inserted into the bolt insertion portion 7b installed in this way.
By press-fitting them, one lug 14 and the terminal bolt 16 are connected and assembled. Note that 17 is a regulator provided on the brush holder 7, and 18 is a terminal bolt that is fitted and assembled into the other bolt insertion portion 7c.

In the embodiment of the present invention constructed as described above, when the terminal bolt 16 is press-fitted into one of the bolt insertion portions 7b to which one of the lugs 14 is attached, it is possible to reliably prevent the occurrence of cracks in the resin of the bolt insertion portion 7b.

That is, in the present invention, the terminal fitting portion 14c of one lug 14 into which the serration 16a of the terminal bolt 16 is press-fitted is a wide plate having approximately the same diameter as the bolt insertion portion 7b. Therefore, the terminal fitting portion 14
The strength of the terminal fitting portion 14c due to the press-fitting of the serration 16a increases significantly.
Not only can the radial expansion and deformation effect of the bolt insertion part 7b be effectively avoided from affecting one bolt insertion part 7b, but also the contact area with the resin of the terminal fitting part 14c can be increased. As a result, the terminal bolt 16
Even if the terminal fitting portion 14c of one lug 14 expands and deforms in the radial direction due to the press-fitting of the serrations 16a, the deformation remains in the vicinity of the periphery of the fitting hole 14e and does not affect the outer periphery. This can be effectively avoided, and since the notch 14d is formed on the outer periphery, the resin of the bolt insertion part 7b enters therein in a dovetail groove shape and is integrated. Bolt insertion part 7b
This prevents the resin forming the terminal fitting part 14c from cracking and the terminal fitting part 14c from peeling off from the bolt insertion part 7b, and ensures the integration of the terminal fitting part with the bolt insertion part 7b, resulting in high reliability. You can make it into something.

It should be noted that the present invention is of course not limited to the above embodiment, but the notches formed in the lugs are not located at symmetrical positions as in the above embodiments, but at asymmetric positions as shown in FIG. If provided in this manner, it is possible to further eliminate cracking and deformation of the resin when the lug is expanded and deformed in the radial direction, albeit slightly.

[Operations and Effects] In short, the present invention is constructed as described above, so that the terminal fitting portion of one lug into which the serrations of the terminal bolt are press-fitted is a wide plate having approximately the same diameter as the bolt insertion portion. It is becoming. For this reason,
The strength of the terminal fitting part itself is significantly increased, so that it is possible to effectively avoid the radial expansion deformation of the terminal fitting part caused by press-fitting of serrations from affecting the outer periphery. Of course, the contact area of the terminal fitting portion with the resin also increases.
As a result, even if the terminal fitting portion of one lug expands and deforms in the radial direction due to the press-fitting of the serrations, the deformation remains in the vicinity of the periphery of the fitting hole, and only occurs in the outer periphery far away in the radial direction. In addition, a notch is formed on the outer periphery where there is almost no influence on the bolt, and the resin from the bolt insertion part enters into this dovetail shape and is integrated. This prevents the resin forming the bolt insertion part from cracking and the terminal fitting part from peeling off from the bolt insertion part, ensuring that the terminal fitting part is integrated with the bolt insertion part. ,
This means that it can be made highly reliable.

[Brief explanation of the drawing]

The drawings show an embodiment of the attachment structure of the connection lug in the brush holder of a vehicle generator according to the present invention, in which FIG. 1 is a cross-sectional side view of the main part of the alternator, and FIG. 3 is a front view and a bottom view of the brush holder, respectively. FIG. 4 is a front view of the lug, and FIG. Z arrow view, FIG. 5
6 is an exploded perspective view of the main parts, and FIG. 7 is a front view of the lug in an unbent state. In the figure, 7 is a brush holder, 7b is a bolt insertion part,
14 is a lug, 14c is a terminal fitting part, 14d is a notch, 14e is a fitting hole, 16 is a terminal bolt, 16a
is a serration.

Claims (1)

[Scope of utility model registration request] In a brush holder 7 of a vehicle generator for accommodating a brush that slides in contact with a slip ring provided on the rotating shaft 2 side, the brush holder 7 is mounted in such a manner that a pair of brushes are elastically loaded so as to be freely retractable. The holder body 7a and bolt insertion portions 7b and 7c protruding from both sides of the holder body are integrally formed using an insulating resin, and the insulating resin includes a pair of bolt insertion portions implanted in each of the brushes. A pair of lugs 14 and 15 are buried therein, to which the pigtails of the lugs 14 and 15 are respectively connected, and one of the lugs 14
The terminal bolt 16 inserted into the bolt insertion portion 7b is electrically connected, and the pigtail joint portion 14a at one end of the lug 14 is made to protrude into the holder body, and the terminal bolt 16 at the other end of the lug 14 is connected to the terminal bolt 16, which is inserted into the bolt insertion portion 7b. The terminal fitting portion 14c that is electrically connected to the bolt insertion portion 7b has an outer peripheral shape that is a wide plate that is approximately the same shape as the end outer peripheral shape of the bolt insertion portion 7b, and is exposed on the end surface of the bolt insertion portion 7b. , brush holder 7
Notch 14 into which the insulating resin fits in a dovetail shape
d, and a fitting hole 14e for press-fitting a serration 16a formed on the outer peripheral surface of a terminal bolt 16 is formed in the center of the terminal fitting part 14c. Installation structure for connection lugs in brush holders of commercial generators.