JP3867391B2 - AC generator for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicular AC generator attached to a bracket of an engine and having a side mount structure.
[0002]
[Prior art]
BACKGROUND ART An AC generator for a vehicle generates power by rotating a rotor at a high speed by an engine rotational driving force transmitted through a belt, and is often directly attached to a bracket of an engine body and fixed. As one of methods for attaching the vehicle alternator to the engine body, a side mount structure is known in which a stay is fastened in a direction perpendicular to the rotation axis direction of the vehicle alternator. For example, an automotive alternator disclosed in Japanese Patent Application Laid-Open No. 9-191595 has a side mount structure, and a mounting surface to a housing is formed in a direction perpendicular to the rotation axis. It is fixed directly to the bracket of the engine body.
[0003]
This side-mounted AC generator for a vehicle has a housing mounting surface in which the bracket mounting surface at the tip of the stay protruding from the front housing and the bracket mounting surface at the tip of the stay protruding from the rear housing are on the same surface. It is necessary to align the circumferential direction. If the circumferential position of the housing is shifted, the bracket mounting surface of each housing will not be placed on the same plane. Therefore, when the vehicle alternator is mounted on the bracket of the engine body, either housing mounting stay Excessive stress is applied to the housing to cause distortion in the housing, which may cause a loud vibration noise or, in the worst case, damage to the housing.
[0004]
Positioning methods are as follows: (1) Positioning holes parallel to the rotation axis are formed in each of the front housing mounting stay and the rear housing mounting stay, and these positioning holes are used for positioning. There are a method of inserting the rod-shaped member in the circumferential direction and (2) a method of processing the bracket mounting surface with high accuracy after assembling using any one end surface of the mounting stay as a reference surface.
[0005]
[Problems to be solved by the invention]
By the way, in the method of positioning the housing by forming a positioning hole in the mounting stay (method (1)), it is difficult to obtain the positioning accuracy or the assembling work when each stay is separated. As a result, the positioning of the housing was not easy. For example, in consideration of assembly work efficiency, if the inner diameter of the positioning hole is made somewhat larger than the outer diameter of the rod-shaped member inserted into the positioning hole, the rod-shaped member and the rotating shaft of the vehicle alternator become parallel. It becomes difficult and positioning accuracy worsens. On the other hand, if you want to increase the positioning accuracy, make the inner diameter of the positioning hole and the outer diameter of the rod-shaped member almost coincident and eliminate the gap between them, it will be difficult to insert the rod-shaped member into the positioning hole during assembly , Work efficiency worsens.
[0006]
In addition, in the method of processing the bracket mounting surface using the end surface of any of the mounting stays as a reference surface (method (2)), it is desirable to process the bracket mounting surfaces of each stay simultaneously. Since the housing protrudes between the two, it is difficult to simultaneously process each bracket mounting surface with a lathe or the like, and the positioning of the housing is not easy.
[0007]
The present invention was created in view of the above points, and an object of the present invention is to provide an automotive alternator in which the housing can be easily aligned in the circumferential direction.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the vehicle alternator according to the present invention has positioning protrusions having mating surfaces that are brought into contact with each other at the time of assembly, and are integrally formed in a part of each of the front housing and the rear housing. Is formed. Therefore, by aligning these mating surfaces and assembling the front housing and the rear housing, it is possible to easily align the respective housings in the circumferential direction.
[0009]
In particular, the mating surfaces of the above-described positioning convex portions are preferably formed in a direction that can restrain the relative circumferential movement of the front housing and the rear housing. By having the mating surfaces in such a direction, the circumferential movement of each housing is restrained only by bringing the mating surfaces of the positioning convex portions into contact with each other, so that the circumferential alignment becomes easy.
[0010]
In addition, it is preferable that a positioning hole that communicates with each other is formed in each of the pair of positioning convex portions, and a restraining member that presses the mating surfaces is attached through the positioning hole. By bringing the mating surfaces into pressure contact with each other through the positioning holes, the contact state between the mating surfaces can be reliably maintained, so that highly accurate positioning is possible.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An alternating current generator for a vehicle according to an embodiment to which the present invention is applied (hereinafter referred to as an “alternator”) is formed with positioning convex portions opposed to each other in a part of each of a front side housing and a rear side housing, A characteristic is that the alignment surfaces of the positioning projections are brought into contact with each other at the time of assembly to align the front side housing and the rear side housing in the circumferential direction. Hereinafter, an alternator according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings.
[0012]
FIG. 1 is a front view of an alternator according to an embodiment to which the present invention is applied. FIG. 2 is a side view of the alternator of the present embodiment shown in FIG. The alternator 1 of the present embodiment shown in these drawings has a side mount structure that is attached to the engine bracket 90 by being fastened in a direction perpendicular to the rotation axis. The alternator 1 includes a stator as a stator and a rotor as a rotor (both not shown) included in a front side housing 10 and a rear side housing 12. A pulley 14 for transmitting the rotational force from the engine is fastened and fixed to the exposed end of the rotating shaft of the rotor. A rear cover 16 is attached to the rear housing 12 by tightening a nut or the like, and a rectifier, a brush device, and a regulator (both not shown) as rectifiers are mounted therein.
[0013]
Mounting stays 20 and 22 as leg portions are formed on the front housing 10 so as to protrude on both sides across the rotation shaft. One mounting stay 20 is formed with a bolt insertion hole 24 as a mounting hole in a direction perpendicular to the rotating shaft of the alternator 1, and the other mounting stay 22 is mounted in a direction perpendicular to the rotating shaft of the alternator 1. Bolt insertion holes 26 are formed as working holes.
[0014]
The rear housing 12 is formed with a mounting stay 30 as a leg so as to protrude from a predetermined position. The mounting stay 30 is formed with a bolt insertion hole 32 as a mounting hole perpendicular to the rotating shaft of the alternator 1.
Screws formed in the engine bracket 90 by inserting bolts into a total of three bolt insertion holes 24, 26, 32 of the respective mounting stays 20, 22, 30 formed in the front housing 10 and the rear housing 12 described above. The alternator 1 is attached to the engine bracket 90 by tightening in the hole.
[0015]
When mounting the alternator 1 to the engine bracket 90, the bracket mounting surfaces of the mounting stays 20 and 22 on the front housing 10 side and the bracket mounting surface of the mounting stay 30 on the rear housing 12 side are accurately formed. Need to be. That is, when the alternator 1 is assembled, the bracket mounting surface of the mounting stay 30 of the rear housing 12 is shifted from the predetermined position in the circumferential direction when the bracket mounting surfaces of the mounting stays 20 and 22 of the front housing 10 are used as a reference. When the alternator 1 is attached to the engine bracket 90, an excessive stress is applied to the attachment stays 20, 22 or the attachment stay 30, which is not preferable. Therefore, it is necessary to devise a technique for matching the relative positions of the bracket mounting surfaces of the mounting stays 20 and 22 and the bracket mounting surface of the mounting stay 30 in the circumferential direction. For this reason, in the alternator 1 of the present embodiment, the front Positioning convex portions are formed on a part of each of the side housing 10 and the rear side housing 12 to restrict movement in one circumferential direction when assembled.
[0016]
FIG. 3 is an enlarged view of the vicinity of the positioning convex portion in the plan view of the alternator 1 shown in FIG. FIG. 4 is an enlarged view of the vicinity of the positioning convex portion in the side view of the alternator 1 shown in FIG. As shown in FIGS. 3 and 4, one positioning convex portion 40 is formed integrally with a part of the front housing 10, and the other positioning convex portion 42 is integrated with a part of the rear housing 12. Is formed. These two positioning convex portions 40 and 42 are formed along the rotation axis of the alternator 1 and are formed at positions that partially overlap in the circumferential direction.
[0017]
Therefore, when the positioning convex portion 40 formed on the front housing 10 and the positioning convex portion 42 formed on the rear housing 12 are brought into contact with the opposing surfaces (matching surfaces) overlapping in the circumferential direction. In addition, they interfere with each other in the circumferential direction, and the circumferential movement is restricted in one direction.
Note that the position of the mating surface of the positioning convex portion 40 is determined so that the distance of the mounting stay 20 or 22 from the bracket mounting surface falls within a predetermined tolerance when the front housing 10 is manufactured. The Similarly, when the rear housing 12 is manufactured, the position of the mating surface of the positioning convex portion 42 is determined so that the distance from the bracket mounting surface of the mounting stay 30 falls within a predetermined allowable error range. .
[0018]
The alternator 1 is assembled in a state where the mating surfaces of the two positioning convex portions 40 and 42 are in contact with each other. As described above, the circumferential positions of the front housing 10 and the rear housing 12 are constrained in one direction by bringing the mating surfaces of the two positioning protrusions 40 and 42 into contact with each other. In this state, the front housing 10 and the rear housing 12 are assembled and fixed so that their positions do not shift, whereby the bracket mounting surfaces of the mounting stays 20 and 24 of the front housing 10 and the rear housing 12 are fixed. The relative position of the mounting stay 30 to the bracket mounting surface is uniquely determined.
[0019]
As described above, the front housing 10 and the rear housing 12 can be easily aligned simply by assembling the alternator 1 with the mating surfaces of the positioning convex portions 40 and 42 being brought into contact with each other. For this reason, when the alternator 1 is attached to the engine bracket 90, it is possible to prevent an excessive stress from being applied to the respective attachment stays 20, 22, and 30 formed on the front housing 10 and the rear housing 12. . Therefore, it is possible to avoid a situation in which the front side housing 10 and the rear side housing 12 are distorted to increase the magnetic noise and vibration, or they are damaged.
[0020]
By the way, the alternator 1 of the above-described embodiment is assembled while maintaining the state in which the positioning convex portion 40 of the front side housing 10 and the positioning convex portion 42 of the rear side housing 12 are in contact with each other. You may make it ensure reliably the contact state of a mutual mating surface by restraining the one positioning convex parts 40 and 42 using another restraining member.
[0021]
5 and 6 are diagrams showing modifications of the positioning convex portion. FIG. 5 shows the shape of the positioning convex portion viewed from the pulley side, and FIG. 6 shows the shape of the positioning convex portion viewed from the side surface of the alternator.
As shown in FIGS. 5 and 6, positioning holes 150 and 152 are formed at corresponding positions in the positioning convex portion 140 of the front housing 10 and the positioning convex portion 142 of the rear housing 12, respectively. Yes. One positioning hole 152 is formed with a thread groove, and is screwed with a screw 154 as a restraining member through the other positioning hole 150, so that the alignment surfaces of the positioning convex portions 140 and 142 are aligned with each other. Press.
[0022]
In this way, by tightening the positioning convex portions 140 and 142 using the screws 154, the alternator 1 can be assembled by bringing the alignment surfaces into contact with each other in a constantly pressurized state. The relative circumferential alignment of the housing 10 and the rear housing 12 can be performed with high accuracy and reliability.
[0023]
Further, the alternator 1 according to the above-described embodiment is configured so that the mating surfaces of the positioning convex portion 40 of the front side housing 10 and the positioning convex portion 42 of the rear side housing 12 are brought into contact with each other. The positioning of the rear housing 12 in the circumferential direction is restrained along one direction for alignment, but one positioning convex portion is sandwiched between the other positioning convex portions and restrained in the circumferential direction. May be.
[0024]
7 and 8 are diagrams showing another modification of the positioning convex portion. FIG. 7 shows the shape of the positioning convex portion as viewed from the pulley side, and FIG. 8 shows the shape of the positioning convex portion as viewed from the side of the alternator.
As shown in FIGS. 7 and 8, the positioning convex portion 242 of the rear side housing 12 is formed so as to sandwich the positioning convex portion 240 of the front side housing 10 along the circumferential direction. Since the other positioning convex portion 240 is sandwiched from both sides by one positioning convex portion 242, the relative positions in the circumferential direction of the positioning convex portions 240 and 242 are fixed, and the front side is formed integrally with each other. The housing 10 and the rear housing 12 can be aligned. In addition, the front housing 10 and the rear housing 12 can be reliably aligned without using a restraining member such as a screw 154 as shown in FIG.
[0025]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the positioning convex portions 140 and 142 shown in FIG. 5 and FIG. 6 use the screw 154 as a restraining member to restrain the movement in the circumferential direction of each other, but use a combination of a bolt and a nut, Other restraint members may be used.
[0026]
Further, in the above-described embodiment, the alignment surfaces of the positioning convex portion 40 of the front housing 10 and the positioning convex portion 42 of the rear housing 12 are formed so as to be included in a plane including the rotation axis of the alternator 1. However, since it is sufficient that the movement in the circumferential direction can be restricted when the two alignment surfaces are brought into contact with each other, an alignment surface inclined so as to have a predetermined angle with the plane including the rotation axis of the alternator 1 is formed. It may be.
[Brief description of the drawings]
FIG. 1 is a front view of an alternator according to an embodiment to which the present invention is applied.
FIG. 2 is a side view of the alternator of the present embodiment shown in FIG.
FIG. 3 is an enlarged view of the vicinity of a positioning convex portion of the alternator shown in FIG. 1;
4 is an enlarged view of the vicinity of a positioning convex portion of the alternator shown in FIG. 2. FIG.
FIG. 5 is a diagram showing a modification of the positioning convex portion.
FIG. 6 is a view showing a modified example of the positioning convex portion.
FIG. 7 is a view showing another modification of the positioning convex portion.
FIG. 8 is a view showing another modification of the positioning convex portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Alternator 10 Front side housing 12 Rear side housing 20, 22, 30 Mounting stay 24, 26, 32 Bolt insertion hole 40, 42 Positioning convex part

Claims (2)

A pair of positioning members having a front housing and a rear housing each having a mounting hole or groove formed in a direction intersecting with the rotation shaft and each having a bracket mounting surface, and having mating surfaces that come into contact with each other during assembly A convex portion is formed integrally with each of the front side housing and the rear side housing , and
The vehicle alternator according to claim 1, wherein the mating surfaces of the pair of positioning projections are formed in a direction capable of restraining relative movement of the front housing and the rear housing in the circumferential direction . Oite to claim 1,
A positioning hole communicating with each other is formed in each of the pair of positioning convex portions, and a restraining member that presses the mating surfaces of the pair of positioning convex portions is attached through the positioning hole. A featured AC generator for vehicles.

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