Sealing device for a gear box

Details Sealing device for a gear box Sealing device for a gear box

2002-09-25

2004-04-27

Knight, Anthony (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Diverse and distinct dynamic seals

C277S351000, C277S549000, C277S576000, C277S577000, C277S572000, C384S489000

Reexamination Certificate

active

06726210

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a sealing device for a gear box and includes a cap mounted to the shaft, and the cap includes a receiving space in which a seal is engaged. The seal prevents oil flowing into the gap between the bearing frame and the bearing.
BACKGROUND OF THE INVENTION
A conventional gear box is shown in FIG.
4
and generally includes a worm rod
20
rotatably received in the box
10
. One end of the worm rod
20
is rotatably connected to an inside of the gear box
10
, and the other end of the worm rod
20
extends from an opening
11
of the gear box
10
. A bearing
60
is engaged with the opening
11
of the gear box
10
, and second end of the worm rod
20
is supported by the bearing
60
and connected with a driving shaft. A seal
61
is mounted to the second end of the worm rod
20
and prevents oil in the gear box
10
from leakage. In order to have a better result of sealing, the seal
61
has to be securely mounted to the worm rod
20
while allowing the worm rod
20
to rotate as desired. The friction between the seal
61
and the second end of the worm rod
20
is too large and consumes the energy for driving the worm rod
20
. The seal
61
is replaced frequently because of wearing.
FIG. 5
shows an improved sealing device which includes a plate
80
mounted to the rotatable shaft
72
in the gear box
70
. The plate
80
has a flange
81
which is mounted to a flange
71
extending from an inside of the box
70
. A bearing
90
is engaged with a hole defined through the wall of the box
70
and is covered by the plate
80
. A seal
91
is mounted to an end of the shaft
72
which extends from the hole of the box
70
. The plate
80
separates the oil in the box
70
to prevent the oil from entering the gaps between an inner periphery of the hole and the beating
90
when the rotatable shaft
72
is rotated. The arrangement of the plate
80
does not require the seal
91
to be secured to the rotatable shaft
72
, so that the friction between the rotatable shaft
72
and the seal
91
is less than that in the example shown in FIG.
4
. Sealing by the plate
80
is not satisfied when the rotatable shaft
72
is not rotated, because the oil may flow over the flange
81
of the plate
80
and then enter into the bearing
90
and the gap between the bearing
90
and the inner periphery of the hole of the box
70
.
The present invention intends to provide a sealing device for a gear box wherein a seal is received in a space of a cap so as to prevent the oil flowing into the gap between the bearing and the frame even when the worm rod is not rotated.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a sealing device for a gear box, and the device comprises a box having a hole defined through a wall thereof. A shaft has a first end rotatably engaged with an inside of the box, and a second end of the shaft extends through the hole. A frame is engaged with the hole of the box, and a bearing is engaged in the frame. The bearing is mounted to the second end of the shaft. A cap is connected to an end of the frame in the box, and a seal is located inside of the cap. The seal has a flexible plate which is engaged with the end of the frame in the box.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.


REFERENCES:
patent: RE24940 (1961-02-01), Stephens
patent: 3482844 (1969-12-01), McKinven, Jr.
patent: 4516783 (1985-05-01), Mitsue et al.
patent: 5004248 (1991-04-01), Messenger et al.
patent: 5024364 (1991-06-01), Nash
patent: 5944321 (1999-08-01), Niebling et al.
patent: 6471211 (2002-10-01), Garnett et al.
patent: 6497514 (2002-12-01), Maldera et al.
patent: 0337893 (1989-04-01), None

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