Bearing assembly having a slinger disk seal element

Details Bearing assembly having a slinger disk seal element Bearing assembly having a slinger disk seal element

1998-07-16

1999-12-28

LaBalle, Clayton

Electrical generator or motor structure

Dynamoelectric

Rotary

384135, H02K 516

Patent

active

060085576

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND INFORMATION

The present invention relates to a bearing for use with an electrical machine that includes a drive shaft mounted in a housing.
European Published Patent Application No. 698 956 describes a known bearing in which a spherical cap, which is made of sintered material and with which a repository for lubricant is associated in order to lubricate the bearing, is used to mount a driving shaft of an electrical machine. Located between the spherical cap and the commutator is a thrust washer or cover disk which consists of a first solid annular disk element and a second elastic disk element joined positively thereto. The solid disk element has two peripheral slinger edges facing the spherical cap. The sintered material used for the spherical cap has the property that because of the capillary effect of the interstices which are present, lubricant is stored and is delivered to the drive shaft during operation as a result of pressure differences. This results in lubrication of the driving shaft, so that it is mounted in a low-friction and low-wear manner in the spherical cap. Due to heating of the sintered bearing during operation of the electrical machine, however, an increase in the volume of the stored lubricant can occur, so that it can emerge laterally out of the sintered bearing. This lubricant emerging during operation is thrown onto the bearing housing via the slinger edges, and returns from there to the spherical cap. This arrangement allows reliable sealing of the bearing even with large assembly tolerances. The two-part configuration of the slinger disk nevertheless requires increased manufacturing and assembly outlay. Moreover, without additional sealing measures it is impossible to rule out completely the possibility that lubricant slung onto the housing wall may penetrate via the surrounding housing to the adjacent commutator.
U.S. Pat. No. 4,711,590 discloses a bearing device for mounting the driving shaft of an electrical machine, having a one-piece slinger disk made of a solid material. The bearing arrangement as a whole is separated by means of a housing from rotating parts arranged on the driving shaft.


SUMMARY OF THE INVENTION

An object of the present invention is to provide a bearing arrangement which is simple to manufacture and which reliably prevents lubricant from getting onto the rotating parts arranged on the driving shaft.
In order to achieve this object, the slinger disk of the present invention is made in one piece of an elastic material and can be manufactured economically and easily even with complex geometries. The flexibility of the slinger disk of the present invention facilitates the assembly thereof, so that the bearing as a whole is easy to assemble. Advantageously, a thermoplastic elastomer is used to manufacture the slinger disk.
It is particularly advantageous if the bearing is configured, toward the slinger disk, in such a way that any lubricant slung away by the slinger disk is thrown directly back onto the bearing.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a sectioned depiction through the bearing region of a continuous excited direct-current motor;
FIG. 2 shows a sectioned depiction through a bearing;
FIG. 3 shows a sectioned depiction through a seal element;
FIG. 4 shows an enlarged detail view of the seal element of FIG. 3; and
FIG. 5 shows a plan view of the seal element.


DETAILED DESCRIPTION

FIG. 1 shows, in a sectioned depiction, the commutator-side bearing region of a continuously excited direct-current motor 10. Direct-current motor 10 possesses a driving shaft 14, mounted within a housing 12, which carries a commutator 16 and a rotor 18. Driving shaft 14 is mounted in a sintered bearing 20. Sintered bearing 20 is arranged in a recess 22 of a bearing shell 24. Bearing shell 24 is immovably joined to housing 12. Additional details of direct-current motor 10 will not be discussed further in the context of the present description, since the construction and operation of a direct-current motor are commonly known. Only the parts essent

REFERENCES:
patent: Re35855 (1998-07-01), Blaettner et al.
patent: 3573510 (1971-04-01), Otto
patent: 3793543 (1974-02-01), Stokke et al.
patent: 3885176 (1975-05-01), Cunningham
patent: 4711590 (1987-12-01), Lakin
patent: 4781476 (1988-11-01), Uhen
patent: 4820948 (1989-04-01), Rogelein
patent: 5798589 (1998-09-01), Ohi et al.

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