JPH11155251A - Electric machine, especially generator without slip ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a generator into which water does not infiltrate, even when the generator is situated under the surface of the water. SOLUTION: An electric machine, especially an AC generator, is provided with a driving shaft 18 which is supported and borne by two ball bearings 13, 16 and which is integrated with a rotor 19, with a plurality of members which are combined in a sandwich shape, i.e., a bearing base 11, a so-called positive cooling body 28 and a connecting plate 32, and with a protective cap 34 which covers and wraps the members. The members are combined by a screw, and the inside space of the generator is kept absolutely tight toward the outside by a corresponding sealing member. Even when the generator is situated under water surface, the inside space of the generator is exhausted by a connected hose bundle through a pressure compensation passage 41 inside a regulator casing 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to an electric machine, in particular an electric generator with no slip ring of the conductive rotor type, which is connected to a fixed excitation coil and a drive shaft.
Preferably having a conductive piece and an integrated rotor,
The drive shaft is supported on both sides by ball bearings arranged in the generator casing, one of the ball bearings is supported by a drive-side bearing base acting as a so-called minus cooling body,
Outside the bearing stand, a so-called plus cooling body of a commutator having a minus diode and a plus diode,
A regulator for regulating the generator is arranged, with the outside of the bearing stand and the screwed connection plate fixed, and further with a plug base outside the bearing stand,
It relates to a type in which these members are surrounded by a protective cap fixed to the bearing stand.

[0002]

2. Description of the Related Art Such a known electric machine is especially mounted on an off-road vehicle, and if the vehicle can run underwater, water may enter the generator, resulting in a failure. In this case, the car can no longer run.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art.

[0004]

In order to solve the above-mentioned problems, according to the configuration of the present invention, the protective cap is water-tightly connected to the bearing base by a sealing member, and the protective cap is provided in the plug base of the adjuster. The pressure compensating passage reaching the space was formed.

[0005]

The electric machine according to the present invention having the above-described features can be used in a suitable manner even when the automobile absorbs moisture and is completely wet, that is, even when the generator is located below the water surface. It has the advantage that it cannot penetrate into the electric machine. This property is also called underwater traveling. The necessary measures are relatively inexpensive.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The alternating-current generator of the conductive single rotor type shown in FIG. 1 has a casing 10 composed of a substantially pot-shaped casing member. The casing 10 is closed by a bearing stand 11. The bearing stand 11 is also referred to as a minus cooling body for the minus diode of the commutator disposed thereon. A ball bearing 13 is disposed in a recessed hole 12 formed in the bearing stand 11. Casing 1
Another ball bearing 16 is seated coaxially with the ball bearing 13 in the protruding portion 15 formed to be zero. A drive shaft 18 of a rotor 19 (claw pole rotor) integrated with the drive shaft 18 is supported in the two ball bearings. A shaft end 18A of the drive shaft 18 protrudes from the bearing stand 11, and a belt pulley 20 for driving the generator is fixed thereon.

The generator has a normal structure, and the stator core 2
2, an iron core 23 having an exciting winding 24, and a rotating conductive piece 26. The conductive piece 26 is a diamagnetic ring 25
And is firmly connected to the rotor 19 through the

[0009] The gaps between the above members are normal and are not shown in detail as they are not essential to the present invention.

Coaxially with the bearing base 11, a so-called plus cooling body 28 for a plus diode of a commutator is provided with a screw 29.
It is fixed at. There is an insulating film 30 between the two members. The head 29A of the screw 29 faces outward, that is, toward the belt pulley. Inside the cooling body 28 in the radial direction is also a connection plate 32 coaxial with the cooling body 28.
The connection plate 32 is fixed to the bearing base 11 with a flat head screw 33. That is, the head of the flat head screw is also directed outward. The member is below the protective cap 34.
The protective cap 34 surrounds the disk 35 inside its diameter and fits into the annular groove 37 of the bearing stand 11 with its outer diameter. Hereinafter, this will be described in detail. First, however, reference is made to FIGS. FIG.
Is shown in a plan view, and FIG. 4 is shown in a side view (the arrow direction G in FIG. 2). The regulator casing is shown at 40.
The regulator casing 40 has a plug base 42 and a pressure compensation path 41 (see FIG. 4). The pressure compensating passage 41 connects the internal space of the generator to an outwardly extending hose bundle (not shown) inserted into the plug base 42. The hose bundle also serves for pressure compensation. Similarly, a plug, not shown, seals the plug joint at plug base 42. The purpose of this arrangement will be described in detail below. However, some important details will be described first.

As described at the outset, a vehicle equipped with the generator of the present invention may fall into a situation where the generator is located below the water surface when crossing underwater. Due to the above pressure compensation, no negative pressure is generated in the generator when the temperature changes,
It is therefore achieved that corrosion products cannot reach the generator. Such an arrangement is also called underwater traveling. In this case, the pressure compensation is performed by the volume of air in the hose bundle by the pressure compensating passage 41 extending into the internal space of the protective cap 34 and the hole in the bearing stand for passing the connecting member through the internal space of the generator. .

In order to keep the liquid from penetrating into the generator, several other measures are required, in addition to the sealing of the interior of the generator casing. For this purpose, the protective cap 34 is
It is important that they are sealed against. For this purpose, a sealing 44 is provided in the groove 37, and an annular edge 45 is fitted in the groove 37 on the outer periphery of the protective cap 34. Furthermore, the sealing 49 in the outer race of the ball bearing 13 between the disk 35 and the bearing stand 11 and the sealing 56 in the regulator casing are important. In the outer flange 51 of the casing 10, a seal ring 53 is also provided in the annular groove 52, and seals the generator casing toward the internal combustion engine. Therefore, care was taken that all generator sections were thoroughly sealed against liquid ingress. The temperature changes mentioned above, i.e. the pressure fluctuations in the generator as the vehicle enters the water with the generator and cools, and the pressure fluctuations caused thereby, require pressure compensation, which is regulated as described above. Pressure compensating passage 4 in vessel casing 40
1 and a hose bundle.

For completeness, reference is further made to FIGS. FIG. 2 shows the sealing member 55 between the bearing stand 11 and the protective cap 34, the adjuster casing 4
0 shows the sealing member 56 and the sealing member 57 of the anti-jamming capacitor 59 (not shown in detail). The rear ball bearing 16 is supported in the generator casing 10 via a ring 58. The disk 35 in the front bearing 13 is a hexagonal bolt 61 in the bearing base 11.
It is fixed by. As shown in FIG. 3, the hexagon bolt 61 is sealed by a sealing 60.

[Brief description of the drawings]

FIG. 1 is a sectional view of an AC generator without a slip ring according to the present invention.

FIG. 2 is a plan view of a bearing stand of the generator shown in FIG.

3 is a sectional view of a detail of the bearing stand shown in FIG. 1;

FIG. 4 is a side view seen in the direction of the arrow shown in FIG. 2;

[Explanation of symbols]

Reference Signs List 10 generator casing, 11 bearing stand, 13 ball bearing, 18 drive shaft, 18A drive shaft, 19 rotor, 24 excitation coil, 26 conductive piece, 32 connection plate, 34 protective cap, 35 disk,
37 annular groove, 39 regulator, 41 pressure compensation path,
42 plug base, 44 sealing member, 45 annular collar, 49 sealing member, 51 flange, 52 annular groove, 53 seal ring

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Gerhard Pfluger Germany Marc Groningen Schillerstraße 23 (72) Inventor Erich Wolff Germany Weichingen Göteststraße 68 (72) Inventor Jürgen Lechner Germany Weichingen / Enz Farzanenstrasse 27 (72) Inventor Wolfgang Gottfried Germany Obersulm Ukskullstrasse 1 (72) Inventor Rainer Brachert Germany Federal Republic Niederstadtzigung Lerchienbuhr 6/1 (72) Inventor Oliver Eckert United Kingdom Cowbridge Hillside Dora Vu 51 (72) inventor Thomas Astragalus down Felder UK Kajifu Misukin Ponte Ikuran (no address)

Claims (6)

[Claims] 1. An electric machine, in particular a non-slip ring alternator of the conductive rotor type, which is coupled to a fixed excitation coil (24) and a drive shaft (18, 18A), preferably The rotor (1) integrated with the conductive piece (26)
9), said drive shaft being mounted on both sides by ball bearings (13, 16) arranged in the generator casing (10), one of which acts as a so-called minus cooling body. It is supported by the bearing stand (11) on the drive side,
A so-called plus cooling body (28) of a commutator having a minus diode and a plus diode and a connection plate (32) screwed to the outside of the bearing stand (11) are fixed to the outside of the bearing stand (11). And a plug base (42) outside the bearing stand (11).
An adjuster (39) for adjusting the generator is arranged, and these components are surrounded by a protective cap (34) fixed to the bearing stand (11). ) Are water-tightly connected to the bearing stand (11) by means of a sealing member, and in the plug base (42) of the adjuster (39), a pressure compensating channel (41) reaching into the space of the protective cap (34). An electric machine, in particular an alternator without a slip ring, characterized by the formation of: The protective cap (34) is provided on the bearing stand (1).
1) having an annular collar (45) projecting into an annular groove (37) provided in 1), said annular collar (45) being surrounded on both sides and on both sides by a sealing member (44). Item 7. The machine according to Item 1. 3. The ball bearing (13) and the bearing stand (11)
3. The machine according to claim 1, wherein the disk (35) surrounded by the protective cap (34) is sealed by a sealing member (49). 4. The plug base (42) of the regulator (39).
4. The pressure compensation in the generator by means of a pressure compensation channel (41) provided in the generator via a hose bundle of corresponding length extending outwardly to be attached thereto. The machine according to claim 1. 5. The machine according to claim 1, which is liquid-cooled. 6. A seal ring (53) is arranged in an annular groove (52) at a flange (51) located outside the casing (10) of the generator.
The machine according to any one of claims 1 to 5, wherein (3) seals the generator against the internal combustion engine when the generator is assembled to the internal combustion engine.