JPH06225485A - Ac power generator for vehicle - Google Patents

Abstract

PURPOSE:To set a stator core floating over a frame by depositing it on a third bracket via an elastic material so that vibration of the stator core is no longer transferred easily to the frame to reduce a level of magnetic noise. CONSTITUTION:A stator core 13 wound with a stator coil comprises a heat resistant rubber material 15 which is formed of an elastic material deposited at the external diameter of the core and a cylindrical third bracket 16. These stator cores 13, rubber material 15 and third bracket 16 constitute an integral structure and it is fixed at an inlow part provided at a front bracket 9 and a rear bracket 10, allowing insertion of the inlow portions at both ends of the third bracket 16. That is, the stator core 13 and the internal circumference of the third bracket 16 are concentrically arranged and clearance between the external and internal diameters of these is filled with a rubber material 15. Thereby, the stator core 13 is floated from the bracket 16 via the rubber material 15. Accordingly, the elastic member, etc., in the frame can be assembled or removed easily for the convenience of repair.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternator for a vehicle of a type that elastically supports a stator and is intended to improve the supporting structure of the alternator, and to improve assemblability and quality.

[0002]

2. Description of the Related Art As a means for reducing the noise of a vehicle AC generator, there is, for example, JP-A-61-258635.
In this, a stator core 13 is fixed to a thin cylindrical metal member by a rubber material 15 via an elastic member, and the metal member is press-fitted and fixed to the inner circumference of the frame on the main body side. However, since the rigidity of the metal member is low, a perfect circle before press-fitting into the frame cannot be secured, which makes work difficult. Also, the concentricity of the stator core inner diameter before press-fitting and the outer diameter of the metal member can be confirmed in advance, but there are drawbacks such as being unable to ensure concentricity with the rotor outer diameter after press-fitting into the frame, making it difficult to commercialize at low cost. Met.

[0003]

SUMMARY OF THE INVENTION In the present invention, basically, an elastic member such as a rubber material is interposed between a stator core and a frame, and it is extremely easy to insert the same into the frame as in the conventional assembly of the stator core. It is an object of the present invention to provide a vehicle AC generator having a simple structure.

[0004]

To this end, the present invention provides a stator core around which a stator coil is wound, a rotor rotating inside the stator core, and the stator core supported inside itself via an elastic member and In a vehicular AC generator including a frame that rotatably supports a rotor, the elastic member is fixed to the inside of a pair of frames different from the frame, and the inside of the elastic member is on the outer periphery of the stator core. It is fixed and is fitted and fixed to the spigot portion of the frame via the spigot portions provided at both ends of the third pair of the other pair.

[0005]

With this structure, the inner diameter of the stator core can be aligned with the pilot portion of the third bracket as a reference even after the stator core is assembled to the third bracket. Also, since the contact parts to the front bracket and the rear bracket are made of a metal member instead of a rubber material, it is extremely easy to fit the frame of the sub-assembly like the assembling of the normal inelastic support type stator. ， The disassembly is the same as the current one and the market serviceability does not change.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment will be described below with reference to FIG.
Reference numeral 1 denotes a rotor fixedly attached to a rotary shaft 2 and having a rotor coil 3 wound thereon, and cooling fins 4 and 5 fixed to both side surfaces thereof
The slip ring 6 is press-fitted into one of the rotating shafts of the above, and is electrically connected to the rotor coil. The rotating shaft is supported by a front bracket 9 and a rear bracket 10 via bearings 7 and 8. The exciting current to the rotor coil 3 is applied to the brushes 12 and 13 supported by the brush holder 11.
Supplied by The stator core 13 around which the stator coil 14 is wound has a heat-resistant rubber material 15 that is an elastic member fixed to the outer diameter portion thereof, and further has a third cylindrical bracket 16 having spigot portions 13a at both ends. Then, the stator core 13, the rubber material 15, the third bracket 1
6 is fitted as an integrated structure (sub-assembly) with the inlay portions 9a, 10a provided on the front bracket 9 and the rear bracket 10 and the inlay portions 16a at both ends of the third bracket 16 and tightened by several bolts (not shown). It is fixed. In the manufacture, the stator core 13 around which the stator coil 14 is wound and the inner peripheral surface of the third bracket 16 are concentrically arranged, and the rubber material 15 is filled in the gap between the outer and inner diameters of these. According to this configuration, if the stator is damaged, it can be attached / detached in sub-assembly units, and therefore service loss can be minimized. Also,
If the rubber material 15 is filled in the process prior to the insulation treatment of the stator coil 14, the fixing work can be performed by utilizing the preheating at the time of the insulation treatment, and there is an advantage that it is possible to cope with it without significantly changing the existing equipment configuration. is there. In addition, the stator core 13
In order to improve the accuracy of the inner diameter of the third bracket 16 and the concentricity of the inlay portion 16a of the third bracket 16, the outer diameter of the third bracket 16 is used as a reference in the final step, and after the inner diameter is processed, the inlay portion 16a of the third bracket 16 is used as the inner diameter. It can be easily secured by processing.

Next, the noise reduction mechanism in the configuration of the present invention will be described.

Since the rotor 1 and the inner diameter of the stator core 13 are rotated through a small gap (for example, 0.4 mm) and this air gap becomes non-uniform, pulsation also occurs in the rotor magnetic excitation force, and the thin plate When the number of rotations matches the resonance frequency of the laminated stator core 13, the stator core 13 resonates and is transmitted through the frame to generate noise. In the present invention, the stator core 13 is fixed to the third bracket 16 via the elastic member, is in a state of being floated from the frame, and has a damping effect of the elastic member.
Noise reduction of about 15% can be achieved at 000 to 4000 rpm.

[0009]

As described above, according to the present invention, since the stator core is floated from the frame, it becomes difficult to transmit the vibration of the stator core to the frame. As a result, not only the magnetic noise is greatly reduced but also the elastic member in the frame is reduced. Assembly,
Alternatively, there is an effect that it is easy to remove from the frame, and it is easy to repair and easy to produce.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vehicle AC generator that is an embodiment of the present invention.

FIG. 2 is a detailed sectional view of a subassembly.

[Explanation of symbols]

1 ... Rotor, 2 ... Rotating shaft, 3 ... Rotor coil, 4 ... Cooling fin (p), 5 ... Cooling fin (SR), 6 ... Slip ring, 7 ... Bearing (FR), 8 ... Bearing (S
R), 9 ... Front bracket, 10 ... Rear bracket, 11 ... Brush (F), 12 ... Brush (L), 13 ...
Stator core, 14 ... Stator coil, 15 ... Heat resistant rubber, 16 ... Third bracket.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Terumoto 2520, Takaba, Katsuta-shi, Ibaraki Hitachi, Ltd. Automotive Equipment Division (72) Inventor Susumu Sasaki 2520, Takata, Katsuta-shi, Ibaraki Hitachi, Ltd. Automotive Equipment Division

Claims (2)

[Claims] 1. A stator core around which a stator coil is wound, a rotor that rotates inside the stator core, and a frame that supports the stator core inside itself via an elastic member and rotatably supports the rotor. In the vehicular AC generator, the elastic member is fixed to the inside of a pair of frames different from the frame, and the inside of the elastic member is fixed to the outer periphery of the stator core, and is provided in the another pair. An alternator for a vehicle, characterized by being fitted and fixed to the spigot portion of the frame via spigot portions provided at both ends of the third frame. 2. The alternator for vehicles according to claim 1, wherein the third pair of the other pair is plastically worked from one steel plate into a cylindrical shape.