Enhanced sealing arrangement for shaft assemblies

axial force A to the O-ring contact

force, depicted

O-ring

(28) and the O-ring

magnitude of

the

(26), but an actual

by an arrow B between the (26) will be larger in

than the axial force A. The magnitude contact

approximately

force

B

by a relationship

will

be

patent as gear

particular,

elements

one

Figure

1 shows the underlying and

environment

its

comprises

rotatable

shaft

housing.

(12),

concepts

a housing extending

The invention an annular

escape

into the fluid environment

sealing

movable

relationship ring

(20).

concentric

with

and

within

also

concentricahy

(21)

An O-ring retainer

an annular sealing

seals

Patent number: US 6293555

through

the housing

or driving 2001

Between

the retainer

is a plurality

equidistantly

extends

between

prevent

passage

retainer

(18) ring

(10).

space

between

housing

and

to abut the rotating is prevented

the seal. Such

that they may prevent the

housing

interior

to

to the lubricant

a lip seal may extend

radially

shaft so that passage from

either

direction

seals are advantageous escape of lubricant if

the

assembly

in from is

“I

the

(10).

(22) and the sealing ring springs

(24),

spaced

within

the

urge the sealing

ring

with

the sealing

10-3

ring

(26) seals the space between

ring (18) and an outer cylindrical

An O-ring

USA

regard,

to

across Llc,

contaminants

area and to prevent

inwards

a seal

and the shaft

In this

attach

of material

the

the housing of exterior

which a driven

Generally,

is

(22),

concentrically

(30) of the retainer

Ohio,

Technologies

interior

escaping.

pass.

(20)

retainer

(22). The springs

(20). An O-ring

Heights,

an

the housing

(18) into an engagement

sealing

Mayfield

Electric

from

and through may

in a

within

of

and

Enhanced sealing arrangement for shaft assemblies

shaft

rotatable

ring

sealing

(22) and the housing

a

a

annular

the

include

its

comprise

with

an

typically

the

ring (18)

The

mounted

arrangements.

shaft assemblies

at (16). The

sealing

the rotatable

in

these

to seal a fluid

of the invention

axially

sealing

(10) and

space (14) and to restrict

basic components

but to

This

through

is applied

within

annular,

of the

environment.

relates

Inventor: J. Sedy

Assignee: Reliance

of the sealing device.

invention

(18)

I

of the sealing

assemblies

pumps,

invention

and their sealing

Rotatable

housing’s

with

shaft

and

with at least one axial bore that extends

C

seal for cooperation

rotatable

reducers

the

assemblies

defined

B = A/cos(a).

covers

housing

Publication hte: 25 September

B

This such

the

surface

(22).

seal (38) precludes

leakage between

the sealing ring (20) and the shaft sleeve (34). An O-ring

seal (42) precludes

leakage

between

the

shaft sleeve (34) and the shaft (12). In operation, the radially

extending

(20) and the sealing relationship, clearance,

faces of the sealing ring

maintaining generated

groove pattern

a

by a shallow

view

invention. springs

of

Pictured

the retainer

onto the disc (32). Through the

disc

(32)

surface

force A is further O-ring

@

seal

crossof

this

is one of the pluralities

springs exert an axial force depicted

of

narrow

fragmentary

a secondary

(24), spaced within

cylindrical

very

and concentric

(44).

Figure 2 shows an enlarged sectiona

ring

(18) are in a sealing

and

of

(22). The

by an arrow A

a facing surface (48) through

an

internal

(50) of the disc (32) the axiaI transmitted

(28). The O-ring

to the non-sealing

(28) then transmits

this

Sealing Technology No. 98

inadvertently

shifted

The

shaft

rotating

seal and thereby Labyrinth one

or

or tilted

shipping.

wear the lip

limit its useful life.

seals typically seal

more

the labyrinth

during

may, however,

stages

have a longer life. The that

fully

form

during

recognizes

shipping.

contact

The present

and addresses

art constructions

the

disadvantages

an annular

seal

other

however,

a zero-clearance

a

variety

reducer,

this

exterror

to an interior

exterior

contaminants.

Referring secured

now

in housing

a

bearings

a housing

lubricant

to prevent

contacting

each shaft.

labyrinth within

an

within

the ingress

a the of

seal

(40)

form

4, shaft

(16) by a bearing

(12) is having

an

(38) secure

the bearing

axially

with

respect

to

interior

area (44) from

Each seal is attached

the exterior

to housing

Sealing Technology No. 98

the housing’s

the

a first

lubricant pass between an

and

seal

annular seal

stage

then

axially

of seal (40). The first labyrinth

and

seal

weeping

the pressure

interior (40).

area

(44) between

Therefore,

of lubricant

seal

of lubricant

there

is

between

the

Pizzichil,

D.

seal and the shaft. Patent number:

Two seals (40) and (42) protect

and

forms

into

labyrinth

from

minimal

the shaft.

(12) chamber

escapes

by bearing

clips (36) and

shaft The

the forms

seal between

may

and

that

shaft

This

migrating (44)

seal’s

until

(42)

(40)

(59).

reduces

the

balls (32). Retaining

and

time,

the

(58)

and

seal

area

stage further

outer race (28) and an inner race (30), separated

and

(40)

nitrile

wears

the shaft.

point,

a second

annular

Over

non-contacting

stage,

outwards to Figure

contact

interior

chamber

(56)

element

At this

rotating

of shaft

surfaces

seal

from

area. In these devices,

seal may be used to retain area and/or

be

cover

one or more

through

interior

should may

such as motors,

that include

extending

it

invention

of mechanisms,

and pumps, shafts

gear

that

material.

rotation

illustrates understood

(52) defined

ring (54) additionally

an hydrogenated

suitable

seals no longer

shaft

(50) that is defined channel

is a continuous

from

(12) extending through a bore (14) in a housing (16). Although the figure

an output

shoulder

(40)

lip seal made

(10) having

for

secures the carrier. Inner

of prior

means,

by a snap fit formed

in the carrier. A retaining

or

a gear reducer

by press fit and/or

between

invention

and methods.

Figure 3 illustrates

by any suitable

the carrier

in the bore and an annular

shaft. These seals may, however, permit leakage of lubricant

in bore (14). The bore may

capture example,

elements do not

(48) that is received

Inventors:

area (46).

Thompson

(16) by a carrier

Publication

F.

US 6290234 Eberle,

W.P

dzte: 18 September

200 1

0