JP3372222B2 - AC generator for vehicles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt fastening structure, and more particularly to a structure around an output terminal of an automotive alternator.

[0002]

2. Description of the Related Art As a conventional structure around an output terminal of an alternator for a vehicle, a resin insulating bush is fitted to an output terminal with a knurl that is press-fitted into a + side cooling fin of a rectifying device. A structure is known in which a nut that serves as a seating surface of a vehicle wiring terminal and a cover are sandwiched.

In this conventional structure, temperature change in the E / G room, temperature change due to self-heating of the vehicle alternator, loosening due to difference in linear expansion coefficient of each part, and stress relaxation of the insulating bush under high temperature occur. Therefore, it is not easy to prevent the nut from loosening by maintaining the tightening torque at the time of assembling.

For this reason, in Japanese Patent Laid-Open No. 165949/1992, a cylindrical portion into which an output terminal is inserted is provided in the + side cooling fin, and a hexagonal nut serving as a seating surface of a vehicle wiring terminal is directly attached to the end of the cylindrical portion. It has been proposed to prevent the hexagon nut from loosening by making it abut.

Further, Japanese Patent Laid-Open No. 9-107654 discloses
Insert the output terminal into the through hole of the + side cooling fin, tighten the output terminal to the + side cooling fin with the nut for tightening the output terminal, and then attach the output terminal to the pair of insulating bushes and the end frame sandwiched by these insulating bushes. It is proposed that the vehicle wiring terminal be inserted and held between the insulating bush and the vehicle wiring terminal tightening nut.

[0006]

However, in the conventional technique disclosed in Japanese Patent Laid-Open No. 4-165949, in consideration of thermal expansion of the output terminal, the output terminal is always tightened with a tightening torque such that axial thrust is generated. Although the hexagonal nut can be prevented from loosening, the end face of the hexagonal nut with a female screw surface formed on the entire fitting surface with the output terminal is used as the seating surface of the vehicle wiring terminal, so that axial thrust is generated at the output terminal. Therefore, it is difficult to prevent the loosening of the vehicle wiring terminal fixing nut due to the difference in linear expansion coefficient between the respective members due to temperature change and vibration.

That is, the axial tightening force of the vehicle wiring terminal fixing nut in this prior art is due to the initial tightening torque at room temperature, and at high temperature, this axial tightening force decreases due to thermal expansion of the output terminal. was there.

Further, in the prior art disclosed in Japanese Patent Laid-Open No. 9-107654, vehicle wiring is performed by axial thrust due to elastic deformation of a pair of insulating bushes by tightening nuts for tightening vehicle wiring terminals and end frames sandwiched by these insulating bushes. Although it is possible to prevent loosening of the terminal tightening nut,
As in Japanese Patent Laid-Open No. 4-165949, it is difficult to prevent the output terminal tightening nut from loosening due to a difference in linear expansion coefficient between members due to temperature change and vibration.

The object of the present invention has been made in view of the above-mentioned problems. Even if a condition of high vibration or large temperature change is used, the output terminal (male screw) for the locking member (for example, + side cooling fin) is used. and loosening of members), both the loosening of the engaged member with respect to the output terminals (eg vehicle wiring terminal), to provide a preventable car dual alternator with a simple structure, and its purpose.

[0010]

A vehicle communication system according to claim 1, wherein:
According to the flow generator, the male screw member having a large-diameter head is inserted into the locking member, the sleeve and the engaged member is fitted to the threaded portion of the male screw member, engaged member distal end surface of the sleeve The seated surface is formed and the nut is screwed onto the threaded portion of the male screw member so that the locked member is pressed and fixed to the seated surface of the sleeve.

In the present invention, in particular, the sleeve is located on the side of the locking member and is loosely fitted on the side of the locking member, and the sleeve is loosely fitted on the side of the locked member. It has a locked member side loose fitting part, and a female screw part located between both loose fitting parts and screwed to the screw part to fix the male screw member to the locking member.

With this configuration, the output terminal (male screw member) is loosened with respect to the locking member (for example, + side cooling fin) and the output terminal is not covered even though the high vibration or large temperature change condition is used. It is possible to realize the vehicle AC generator capable of preventing both the loosening of the locking member (for example, the vehicle wiring terminal) with a simple structure.

A more detailed description will be given below. (Fixing of Male Thread Member and Sleeve to Locking Member) By screwing the female thread portion of the sleeve onto the male thread member and tightening, the locking member side loose fitting portion of the sleeve is elastically deformed and compressed in the axial direction. The one end surface of the locking member side is pressed against the sleeve seating surface of the locking member by the axial thrust due to the compression of the locking member side loose fitting portion of the sleeve.

On the contrary, the engaging member side facing portion of the male screw member, which is the portion facing the engaging member side loose fitting portion of the sleeve in the radial direction, is elastically deformed in the axial direction and pulled, and the head of the male screw member is It is pressed against the head seating surface of the locking member by the axial thrust due to the pulling of the male screw member. Naturally, the axial thrust acting on the male screw member and the axial thrust acting on the loose fitting portion of the sleeve on the locking member side are equal in magnitude but opposite in direction.

Thus, the sleeve can be fastened to the male screw member within the elastic limit of the compression side of the sleeve and the elastic limit of the pull side of the male screw member, and the male screw member and the sleeve are fixed to the locking member with a large axial thrust. Will be. (Fixing of Male Thread Member and Sleeve to Locked Member) The locked member is fitted to the male screw member to be seated on the locking member seating surface of the sleeve, and the nut is screwed to the male screw member to The engaged member side loose fitting portion is elastically deformed and compressed in the axial direction, and the one end surface of the sleeve on the engaged member side is engaged by the axial thrust due to the compression of the engaged member side loose fit portion of the sleeve. It is pressed against the sleeve seating surface of the member.

On the contrary, the engaged member side facing portion of the male screw member, which is a portion radially facing the engaged member side loose fitting portion of the sleeve, is elastically deformed in the axial direction and pulled, and the nut is the male screw member. By the axial thrust force of the above-mentioned pulling, the nut seating surface of the locked member is pressed. Naturally, the axial thrust acting on the male screw member and the axial thrust acting on the loose fitting portion of the sleeve on the locking member side are equal in magnitude but opposite in direction. (Effect) By adopting the above-described structure in which the loose fitting portions are provided on both axial sides of the female thread portion of the sleeve, the loose fitting portion of the sleeve on the locking member side is elastically compressed and deformed in proportion to its elastic modulus and axial length. The male screw member and the engaging member-side facing portion of the male screw member are coupled in a state of being elastically stretched and deformed in proportion to the elastic modulus and the axial length thereof.

As a result, the male screw member, the sleeve, and the locking member always maintain their elastic reaction force and loosen the connection even under the circumstances where they are subjected to strong vibration and the axial length change of each member due to temperature change is large. Is prevented.

Further, the loose fitting portion of the sleeve on the engaged member side is
The male screw member is coupled in an elastic compression deformation state proportional to its elastic length and axial length, and the engaged member side facing portion of the male screw member is coupled in an elastic tensile deformation state proportional to its elastic modulus and axial length. To be done.

As a result, the male screw member, the sleeve, and the locked member always maintain an elastic reaction force and are coupled even under the environment of strong vibration and a great change in axial length of each member due to temperature change. It is prevented from loosening.

Further, since the both screw-fastened joints can maintain the screw-fastened state independently of each other, it is not necessary to loosen the male screw member and the sleeve from the locking member when mounting the locked member. It will be easy.

Furthermore, since the female screw portion of the sleeve is formed integrally with at least one loose fitting portion, an increase in the number of parts is suppressed and workability is improved.

A nut may be screwed on the screw to form the head of the male screw member.

Further, since both the loose fitting portion and the female screw portion of the sleeve are formed integrally, the increase in the number of parts is further suppressed and the workability is further improved.

According to the structure described in claim 2, in the vehicle alternator according to claim 1, the male screw member is further provided between the head portion and the screw portion, and is rotated in the through hole of the locking member. Since there is a fitting portion that fits while being regulated, such as a polygonal outer peripheral surface or knurling fitting, the sleeve does not have to be held unrotatably when the male screw member is attached to the locking member by the sleeve. The male screw member does not rotate together with the rotation, and the workability is improved.

According to the configuration of claim 3, claim 1 or
In the vehicle alternator described in 2, the axial length of the locking member side loose fitting portion of the male screw member is equal to or longer than the axial length of the through hole of the locking member, so that stable axial thrust can be obtained. The sleeve can be prevented from loosening.

According to the structure of claim 4 , in the vehicle alternator according to any one of claims 1 to 3 , further,
Since the axial length of the loose fitting portion of the sleeve on the locked member side is equal to or longer than the axial length of the through hole of the locked member, stable axial thrust can be obtained and loosening of the nut can be prevented. .

According to the structure of claim 5 , in the vehicular AC generator according to any one of claims 1 to 4 , further,
Since the axial length of the loose fitting portion of the sleeve on the locked member side is longer than the axial length of the loose fitting portion of the locking member side, even if an abnormal force acts on the locked member. The loosening occurs on the sleeve side, the nut can be prevented from falling off and the locked member can be removed, and safety can be ensured.

According to a sixth aspect of the present invention , in the vehicular AC generator according to any one of the first to fifth aspects, further, since the axial lengths of both loose fitting portions are made equal to each other, the sleeve can be attached in reverse. The assembly process can be facilitated.

According to the structure described in claim 7 , in the vehicle alternator according to any one of claims 1 to 6 ,
Since the sleeve has a polygonal outer peripheral surface, it is easy to screw the sleeve onto the male screw member.

According to the structure described in claim 8, in the vehicle alternator according to claim 7 , the polygonal outer peripheral surface is formed only on the outer peripheral surface of the engaging member side loose fitting portion. The average outer diameter can be reduced, and the material cost can be reduced due to the size reduction.

According to the ninth aspect of the invention, in the vehicular AC generator of the seventh aspect, further, since the outer peripheral surface of the sleeve is formed in a polygonal shape, a tool is required for screwing and rotating the sleeve. The outer peripheral surface of the sleeve can be easily gripped by.

According to a tenth aspect of the invention, in the vehicular AC generator according to any one of the first to ninth aspects, further, the female thread portion of the sleeve and the nut have male thread surfaces having the same diameter and pitch. Since it has, it becomes easy to manufacture the male screw member screwed to them. Further, the force for screwing the nut onto the male screw member acts in the tightening direction rather than in the loosening direction, which is advantageous.

According to the eleventh aspect, in the vehicular AC generator according to any one of the first aspect and the tenth aspect , the male screw member and the sleeve have the same coefficient of thermal expansion, so that the temperature change. Even in a large environment, loosening can be prevented satisfactorily.

According to a twelfth aspect, in the vehicle AC generator according to any one of the first to eleventh aspects, the locking member further comprises a high-order DC output terminal of the rectifier for rectifying the generated voltage. since connected thereto conductor pieces or Rannahli, the engaged member consists terminal member of a cable for electrically connecting the male screw member of + terminal and good conductivity of the in-vehicle battery, the vehicle with good anti-loosening properties AC generator can be realized.

According to the configuration of claim 13, claim 12
Further, in the vehicle alternator described above, since the sleeve is formed of a highly conductive metal material, the output resistance of the vehicle alternator can be reduced.

According to the configuration of claim 14, claim 13
The vehicle alternator described above further has an electrically insulating insulating cylinder portion having a polygonal hole that fits with the sleeve and covering a part or the whole of the sleeve. Therefore, leakage safety can be improved. And, it is possible to prevent the rotation of the insulating cylinder portion. Further, it is possible to avoid the problem that the sleeve is accidentally loosened instead of loosening the nut when the locked member is removed.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION A vehicle AC generator of the present invention will be described below with reference to the drawings.

[0038]

Embodiment 1 A vehicle AC generator of this embodiment will be described below with reference to FIGS. 1 and 2. The vehicle alternator shown in FIG. 1 includes a rotor 2 that receives a rotational force from an engine through a belt and a pulley 1 and rotates, a pair of bearings 3A and 3B that rotatably support the rotor 2 in a housing 3, and a rotor. A stator 4 that is fixed to the inner peripheral wall of the housing 3 so as to include 2 and that induces an AC voltage by the rotating magnetic field generated by the rotation of the rotor 2, and a rectifier that rectifies the AC power of the stator 4 and converts it to DC power. 5 and rectifier 5
A regulator 6 that adjusts the DC output voltage rectified by the controller to a desired value, a brush 8 that supplies an exciting current to the field winding 7, a rectifier 5, a regulator 6, a metal cover 9 that covers the brush 8, and the like. Has been done. Reference numeral 10 is an output terminal with a knurl (male screw member in the present invention). (Structure of Main Part) FIG. 3 shows an enlarged cross section of the vicinity of the output terminal 10, which is a main part of this embodiment.

Output terminal (male screw member in the present invention) 10
Is press-fitted into the through hole 11a of the positive-side cooling fin (locking member in the present invention) 11 of the rectifying device 5. The output terminal 10 has a head portion 10a having a diameter larger than that of the through hole 11a and a screw portion 10b extending from the head portion 10a and inserted into the through hole 11a.

The output terminal 10 has a spacer (sleeve referred to in the present invention) 12 inserted therethrough, the base end surface of the spacer 12 is in contact with the cooling fin 11 on the positive electrode side, and the vehicle wiring terminal ( The locked member 13 in the present invention is seated.

A nut 1 is attached to the screw portion 10b of the output terminal 10.
4 is screwed, and the vehicle wiring terminal 13 is sandwiched between the nut 14 and the tip end surface of the spacer 12.

The spacer 12 has a through hole into which the screw portion 10b of the output terminal 10 is fitted, and the spacer 12 is a spacer.
A female screw surface is formed on the inner peripheral surface of the female screw portion 12c located substantially at the center of the shaft 12 in the axial direction. The spacer 12 is
The locking member side loose fitting portion 12a which is located on the positive electrode side cooling fin 11 side and is loosely fitted to the screw portion 10b, and the locked member side loose fitting which is located on the vehicle wiring terminal 13 side and is loosely fitted to the screw portion 10b. The fitting portion 12b and the female thread portion 12c located between the loose fitting portions 12a, 12b and screwed to the screw portion 10b of the output terminal 10 to fix the output terminal 10 to the positive electrode side cooling fin 11 are provided. . The locking member side loose fitting portion 12a and the locked member side loose fitting portion 12b are provided unless the output terminal 10 is axially biased.
You may contact the screw part 10b of the output terminal 10.

The output terminal 10 has a knurled portion (fitting portion) 10c which is interposed between the head portion 10a and the screw portion 10b and is knurled into the through hole 11a of the positive electrode side cooling fin 11. The rotation of the knurled portion 10c is restricted by the through hole 11a of the positive electrode side cooling fin 11.

The spacer 12 is provided with an insulating bush 15 made of resin, and the insulating bush 15 serves as the output terminal 1.
0 is electrically insulated from the metal cover 9. Spacer 12
The female screw portion 12c of the output terminal 10 has a male screw surface having the same diameter and pitch as the nut 14, and has a screw portion 10b of the output terminal 10.
It is screwed to the male thread surface of.

The axial length L of the engaging member side loose fitting portion 12a of the spacer 12 is set to be equal to or larger than the plate thickness T1 of the positive electrode side cooling fin 11 which is equal to the axial length of the through hole 11a of the positive electrode side cooling fin 11. The loose fitting portion 12b of the spacer 12 on the locked member side
The axial length L'of is equal to or larger than the plate thickness T2 of the vehicle wiring terminal 13 which is equal to the axial length of the through hole 13a of the vehicle wiring terminal 13. Further, in this embodiment, the axial length L'of the locked member side loose fitting portion 12b is made longer than the axial length L of the locking member side loose fitting portion 12a, but even if both are made equal. Good.

The output terminal 10 and the spacer 12 are made of ferrous metal having substantially the same thermal expansion coefficient, and both have good conductivity. A radial cross section of a portion 12d located in the vicinity of the positive electrode side cooling fin 11 including at least a portion fitted into the through hole 11a of the positive electrode side cooling fin 11 of the spacer 12 is formed in a regular hexagonal shape. (Assembly method) The knurled portion (fitting portion) 10c of the output terminal 10 is press-fitted into the through hole 11a of the positive electrode side cooling fin 11, the spacer 12 is fitted into the output terminal 10, and the spacer 12 of the spacer 12 is inserted. The regular hexagonal portion is rotated to fasten the output terminal 10 and the spacer 12 to the positive electrode side cooling fin 11.

Next, the vehicle wiring terminal 13 is fitted to the output terminal 10 and seated on the tip end surface of the spacer 12, and the nut 14 is attached.
Is fastened to the output terminal 10 to fix the vehicle wiring terminal 13 to the output terminal 10 and the spacer 12.

According to the vehicle alternator of this embodiment described above, the locking member side loose fitting portion 12a of the spacer 12 is elastically deformed in the compression direction and the locking member side loose fitting portion 12a.
The strong axial thrust generated by the elastic deformation of the portion of the output terminal 10 corresponding to a in the pulling direction strengthens the coupling between the output terminal 10 and the spacer 12 and the positive electrode side cooling fin 11.

In addition, elastic deformation of the loosely fitted portion 12b of the spacer 12 on the engaged member side in the compression direction and pulling of the portion of the output terminal 10 corresponding to the loosely fitted portion 12b of the engaged member side are pulled. The strong axial thrust generated by the elastic deformation of the vehicle strengthens the connection between the output terminal 10 and the spacer 12 and the vehicle wiring terminal 13.

[0050]

Second Embodiment Another embodiment will be described with reference to FIG. In this embodiment, the outer circumference of the spacer 12 is formed into a regular hexagonal column shape in the first embodiment described above, and the inner peripheral surface of the insulating bush 15 is also formed into the same shape accordingly.

By doing so, since the rotation of the insulating bush 15 can be prevented, the contact surface between the metal cover 9 and the insulating bush 15 and the groove 16 for the wiring terminal provided in the insulating bush 15 are formed. It is possible to prevent abrasion with the vehicle wiring terminal 13 and facilitate positioning of the insulating bush 15 when assembling.

Further, in this embodiment, the loose fitting portion 1 on the locking member side is provided.
Since the axial length L of 2a and the axial length L'of the locked member side loose fitting portion 12b are made equal, there is no restriction on the mounting direction, and erroneous mounting can be prevented.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a vehicle AC generator according to a first embodiment.

FIG. 2 is a rear view of the vehicular AC generator shown in FIG. 1 seen from the rear side.

FIG. 3 is a cross-sectional view taken along the line AA of the vehicle alternator shown in FIGS. 1 and 2.

FIG. 4 is a sectional view of the vicinity of an output terminal of the vehicular AC generator according to the second embodiment.

[Explanation of symbols]

10 is an output terminal (male screw member) with a knurl, 10a
Is a head part, 10b is a screw part, 10c is a knurled part (fitting part), 11 is a positive-side cooling fin (a locking member in the present invention), 11a is a through hole, 12 is a spacer (sleeve),
12a is a loose fitting portion on the locking member side, 12b is a loose fitting portion on the locked member side, 12c is a female screw portion, 13 is a vehicle wiring terminal (locked member), 14 is a nut, 15 is an insulating bush (insulating tubular portion). )

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-4-165949 (JP, A) JP-A-7-250450 (JP, A) JP-A-7-213004 (JP, A) Actual development Sho-58- 196450 (JP, U) Actual development 56-164672 (JP, U) Actual development Hei 5-95169 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 5/00 H02K 5 / 22 H02K 19/36

Claims (14)

(57) [Claims] 1. A locking member having a through hole, a head portion having a diameter larger than that of the through hole, and a male screw member having a screw portion extending from the head portion and inserted into the through hole, and fitted to the screw portion. One or a plurality of sleeves that are attached to the locking member so that the base end surface is in close contact with the locking member, a nut that is screwed to the screw portion, and a through hole into which the screw portion is inserted. A locked member that is clamped by a nut; the sleeve is a locking member-side loose fitting portion that is located on the locking member side and that is loosely fitted to the screw portion; and a position that is on the locked member side. Then, the locked member side loose fitting portion that is loosely fitted to the screw portion, and screwed to the screw portion located between the both loose fitting portions,
Has a female screw portion for fixing the male screw member with the locking member, wherein both loosely fitted portion and the internally threaded portion of said sleeve, one
AC power generation for vehicles characterized by being formed on the body
Machine . 2. The vehicle alternator according to claim 1 , wherein the male screw member is interposed between the head portion and the screw portion and pivots in a through hole of the locking member. An alternator for a vehicle having a fitting portion that fits while being regulated. 3. The vehicle alternator according to claim 1 or 2 , wherein an axial length of the engagement member side loose fitting portion is an axial length of a through hole of the engagement member. Vehicle communication characterized by the above
Flow generator . 4. A vehicle according to any one of claims 1 to 3 .
In alternator, axial length of the engaged member side loosely fitted portion, characterized in that the are more axial length of the through-hole of the locked member vehicle
AC generator . 5. A vehicle according to any one of claims 1 to 4 .
In alternator, axial length of the engaged member side loosely fitted portion, characterized in that it is longer than the axial length of the locking member side loosely fitted portion vehicles
AC generator . 6. A vehicle according to any one of claims 1 to 4 .
In alternator, axial length of the engaged member side loosely fitted portion, characterized in that it is equal to the axial length of the locking member side loosely fitted portion vehicles
AC generator . 7. A vehicle according to any one of claims 1 to 6 .
In the AC generator , the sleeve has a polygonal outer peripheral surface, and the AC generator for a vehicle is characterized in that. 8. The vehicular AC generator according to claim 7 , wherein the polygonal outer peripheral surface is formed only on the outer peripheral surface of the engaging member side loose fitting portion. AC generator for vehicles . 9. Te claim 7 automotive alternator smell <br/> according outer peripheral surface of the sleeve, automotive alternator, characterized in that all formed in a polygonal shape. 10. The vehicle according to any one of claims 1 to 9.
AC generator for vehicle , characterized in that the female screw portion and the nut of the sleeve have male screw surfaces having the same diameter and pitch .
AC generator . 11. A vehicle according to any one of claims 1 to 10.
In dual alternator, the male screw member and the sleeve, the vehicle AC generator characterized in that it has an equal thermal expansion coefficient. 12. The method of claim 1 to an automotive alternator according to any one of 11, the locking member is made of a conductor piece which is connected to the high DC output ends of the rectifier for rectifying the generated voltage, the object The vehicle alternator, wherein the locking member comprises a terminal member of a cable for electrically connecting the + terminal of the vehicle-mounted battery and the male screw member having good conductivity. 13. The vehicle alternator according to claim 12 , wherein the sleeve is made of a highly conductive metal material. 14. The vehicle alternator according to claim 13 , further comprising an electrically insulating insulating tubular portion having a polygonal hole fitted with the sleeve and covering a part or the whole of the sleeve. Characteristic vehicle alternator.