JPH0343857B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved structure of a vehicle alternator,
More specifically, the present invention relates to an improvement in the structure of a stay attached to an engine.

A conventional vehicular alternator has a frame consisting of a front frame and a rear frame to support its stator and rotor, the frame has at least two stays, and one of the two stays is connected to the engine. The other stay is attached to the adjuster bar on the engine side and adjusts the tension of the generator drive belt.

In the conventional structure as shown in Fig. 1, each stay 2a of the rear frame 2 and front frame 1,
The engine-side mounting member 8 is sandwiched between the stays 1b and tightened with bolts 9 and nuts 10. At this time, the distance between the stays 2a and 1b and the width of the engine-side mounting member 8 are determined. In order to absorb the difference, the bush 11 fitted into the hole of one of the stays 2a was slid in the axial direction when the nut 10 was tightened, so that the end surface of the bush 11 and the side surface of the mounting member 8 were brought into contact. .

Furthermore, in another conventional structure as shown in FIG. 2, one stay 1b provided on the front frame 1 is
between the mounting members 8 on the engine side, bend or slide the mounting members 8 to adjust the dimensional difference between the width of the stay 1b and the distance between the mounting members 8, and tighten the bolts 9 and nuts 10. It was tightened and fixed.

In the conventional structure shown in Figure 1, the dimensional difference between the width of the engine mounting member and the distance between the stays of the generator is adjusted by a sliding bush fitted into the stay hole. If the fitting is made loose, the bush will easily slide in the axial direction when the nut is tightened, but vibration will cause looseness in the fitting portion, and the entire generator will therefore vibrate greatly.
Also, if the fitting is made tighter, it will be difficult for the bush to slide in the axial direction, and when the nut is tightened, an abnormally large stress will be applied to the stay, which may damage the aluminum frame or cause distortion in the frame bearing. Furthermore, since the end face of the bush and the side face of the mount do not come into perfect contact with each other, the entire generator cannot be securely fixed to the mounting member and is therefore subject to strong vibrations from the engine. For this reason, until now, the generator has been used with a compromise of an appropriate interference fit, resulting in high vibration of the entire generator.
The problem was that the vibration resistance was poor.

In addition, in another conventional structure shown in Fig. 2, the stay provided on the outer periphery of the front frame is held between mounting members, and the dimensional difference between the distance between the mounting members and the width of the stay is compensated by bending the mounting member. , adjust,
Because it is fastened with bolts and nuts, an abnormally large amount of stress is placed on the aluminum frame. Although this does not cause distortion of the bearing, it has the following disadvantages. In other words, only the front stay is fixed to the mounting member, and the rear frame is not fixed to the mounting member, so when vibrations from the engine are received, it is possible to suppress the shaking of the rear bearing that surrounds the rear side of the rotor in the generator. Therefore, the generator as a whole had the problem of high vibration and poor vibration resistance.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to obtain an alternator for a vehicle that has low vibration and excellent vibration resistance.

In one embodiment of the present invention, the stay of the generator attached to the mounting member of the engine is composed of two stays provided on the outer periphery of the front frame and the outer periphery of the rear frame, and further, the facing end surfaces of the two stays are By holding both stays on the engine mounting member and bending the engine mounting member, the dimensional difference between the distance between the mounting members and the stay width is absorbed, and the bolt and nut By tightening and fixing, the generator is firmly fixed to the engine mounting parts without applying any abnormal stress to the generator frame or causing distortion to the bearings, resulting in low vibration and excellent vibration resistance. This constitutes a vehicle alternator that has the following characteristics.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, the two opposing frames 1 and 2 of the generator are molded from aluminum die-casting and have a pair of roughly bowl-shaped shapes. The shaft 5a of the field section 5 is supported by bearings 4, 4' which are fitted together and provided at the center of the side surfaces of each frame 1, 2. The outer cylindrical part of the frame 1 has stays 1a, 1
b are attached to each other at an appropriate angle, and one stay 1a is formed at a position where it is tightened and fixed to an adjustment bar 7 of the engine by a bolt 6. The other stay 1b has a reinforcing rib (not shown) attached to the bearing part 1c.
By providing between the other stay 1
b is formed on the outside of the frame 1 in a shape that strengthens the connection between the bearing part 1c and the bearing part 1c. 1d,
2d is an end face located between the stays 2a and 1b and in face-to-face contact with each other; one end face 1d of the stay 1b;
is processed simultaneously with the machining of the dowel 1e formed at the peripheral end of the frame 1, and therefore the end face 1d and the dowel 1e are on the same plane. In other words, the end surface 1d is formed as an extension of the solder die 1e. Further, a stay 2a is attached to the outer peripheral cylindrical portion of the other frame 2 at the same angle as the other stay 1b of the front frame 1, and the stay 2a and the rear frame 2 are attached in the same way as on the front side.
By providing a reinforcing rib between the stay 2a and the rear bearing portion 2b, the stay 2a is firmly connected to the rear bearing portion 2b, and one end surface 2d of the stay 2a is connected to the dowel 2c of the rear frame. are processed at the same time, so that the end face 2d is
It is located in the extension of c.

Reference numeral 5 denotes a field section, which, as is well known, is composed of a rotor coil 5b and a rotor core 5c with claws, and this field section 5 is rotated by both frames 1 and 2 via a rotating shaft 5a and bearings 4 and 4'. It can be installed freely. Reference numeral 3 denotes a stator section, which includes a stator coil 3a (also referred to as an armature coil) and a stator core 3b.

At the stage of assembling the generator, both end frames 1 and 2 come into contact and fit together at their dowels 1e and 2c. At this time, since the opposing end faces 1d and 2d of the stays 1b and 2a are substantially on the same plane as the mark on the frame, they come into contact with each other without any gaps, so that one stay can be formed on the outer periphery of the generator frame. . Then, the one stay 1b, 2a is inserted between the mounting members 8 of the engine and mounted, and then tightened and fixed with bolts 9 and nuts 10. Furthermore, the stay 1a is fastened and fixed to an adjuster bar 7 extending from the engine by bolts 6, so that the generator is firmly fixed to the engine.

Note that the dimensional difference between the width of the stays 1b and 2a and the distance between the mounting members 8 is adjusted by bending the mounting member 8, but the distortion of the mounting member 8 caused by the bending of the mounting member 8 is Due to the strong rigidity of No. 8, no problems arise.

FIG. 5 shows the results of a vibration test of the generator of the above embodiment. In this graph, A is the characteristic of the conventional generator shown in FIG. 1, B is the characteristic of the conventional generator shown in FIG. 2, and C is the characteristic of the embodiment of the present invention shown in FIG.

In the above embodiment, the stays 1b and 2a of the generator are clamped and fixed from both sides by the mounting member 8, but by increasing the rigidity of the bolt 9, the stay of the generator can be attached to one side of the engine. It may be tightened and fixed by a structure in which it is pressed against a member.

Alternatively, it may be configured as shown in Fig. 4, and this fourth
The difference between the figure and the embodiment shown in FIG.
This is because it is clamped and fixed by 2.

As described above, the present invention has the following effects.

When fixing the stay to the mounting member, the generator can be firmly fixed to the mounting member without applying abnormal stress to the frame due to tightening.

It also suppresses the vibration of the entire generator and has excellent vibration resistance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional generator, FIG. 2 is a sectional view of another conventional generator, FIG. 3 is a sectional view of an embodiment of the generator of the present invention, and FIG. 4 is a sectional view of another generator of the present invention. FIG. 5 is a graph showing a comparison of the vibration modes of the present invention and the conventional generator. 1, 2... Frame, 5... Field part, 3... Stator part, 1d, 2d... End face, 1b, 2a... Stay, 8... Mounting member, 9... Bolt, 1e, 2
c... Let's mark it.

Claims (1)

[Claims] 1. Two substantially bowl-shaped frames 1 and 2 facing each other, a field section 5 rotatably provided within the frames 1 and 2, and a field section 5 surrounding the field section 5; a stator section 3 attached to the frames 1 and 2; a pair of stays 1b and 2a that are integrally formed on each of the frames 1 and 2 and have end surfaces 1d and 2d that face and contact each other; one of the stays 1b and 2a; Or an alternator for a vehicle, comprising mounting members 8 on the vehicle engine side provided on both sides, and fixing means 9 for tightening and fixing the mounting members 8 and the stays 1b, 2a. 2. Both the frames 1 and 2 are connected to each other by fitting the dowels 1e and 2c formed on the peripheral ends thereof, and the end faces 1d and 2d of the stays 1b and 2a that come in face-to-face contact are connected to the dowels 1e and 2c, respectively. 2c. The vehicle alternator according to claim 1, which is an extension of 2c.