CA1109501A - Thrust washer and combination seal and thrust washer method and apparatus - Google Patents
Thrust washer and combination seal and thrust washer method and apparatusInfo
- Publication number
- CA1109501A CA1109501A CA361,861A CA361861A CA1109501A CA 1109501 A CA1109501 A CA 1109501A CA 361861 A CA361861 A CA 361861A CA 1109501 A CA1109501 A CA 1109501A
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- Prior art keywords
- thrust washer
- housing
- seal
- shaft
- sealing
- Prior art date
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Abstract
THRUST WASHER AND COMBINATION SEAL AND
THRUST WASHER METHOD AND APPARATUS
ABSTRACT OF THE DISCLOSURE
A thrust washer having a backing layer of re-silient material such as rubber or other elastomers and having, for example, a polytetrafluoroethylene bearing surface, which can include one or more integral sealing lips formed from the polytetrafluoroethylene bearing material. Another aspect of this invention is a unitary article including said resiliently-backed thrust washer in combination with a seal. This unitary article can be purchased and installed as a unit taking the place of four separate prior art elements that had to be purchased and installed separately.
THRUST WASHER METHOD AND APPARATUS
ABSTRACT OF THE DISCLOSURE
A thrust washer having a backing layer of re-silient material such as rubber or other elastomers and having, for example, a polytetrafluoroethylene bearing surface, which can include one or more integral sealing lips formed from the polytetrafluoroethylene bearing material. Another aspect of this invention is a unitary article including said resiliently-backed thrust washer in combination with a seal. This unitary article can be purchased and installed as a unit taking the place of four separate prior art elements that had to be purchased and installed separately.
Description
~ "
THRUST WASHER AND COMBINATION SEAL AND TIIRUST
WASHER METHOD AND APPAR~rrUS
BACKGROUND OF THE INVENTION
This application is a division o~ Canadian Serial No.
286,109, filed 5eptember 6, 1977.
Field oE the Inventlon ; This inven~ion relates to thrust washers and to seals and in particulax to an lmproved thrust washer and also to : a unitary combination of said improved thru~t washer and a seal.
' ~ :
.: .
; Description of the Prior Art _ In many applications, seals are used in proximity to thrust washers which can be, for example, ~ ring made of treated nylon material. These parts are purchased separately and installed separately. In addition, some applica-tions require the four separate parts of: (1) a metal, seal-retaining ring, (2) a primary seal, (3) a thrust washer, and (4) a secondary seal, which separate parts must be purchased separately and installed separately.
It is an object of the present invention to overcome such problems in the prior art and to provide a uni-tary seal and thrust washer.
~In prior art applications requiring thrust washers and which are not under load at all times, the prior art thrust washers have a tendency to "pound out" (plastics have a tendency to "plastic flow" which means, for exc~mple, that f a plastic thrust washer is hit enough time~ with no yive, it has a tendency to deform and change its shape or extrude slightly).
It is another object o~ the present invention to over-come such problems in the prior art by providing a resiliently-backed thrust washer and to also prevent shock build-up between two axially movable members. I-t is another object of ~he present invention to provide a rubber-backed thrust washer having an integral sealing lip.
SUMMARY_OF T~IE INVENl'ION
One aspect of the invention in a broad sense pertains to an article comprising a unitary seal and thrust washer com-prising a seal and a thrust waS}I~r integrally connected to ~2-s~
said seal. The seal includes a mounting por-tion and an inte-gral sealing portion. The mounting portion includes a cylindrical portion and a radial flange The cylindrical portion has an O.D. surface adapted to form a pxess-fi-t in a housing bore, and the sealing portion extends axially away from the radially inner end of said radial flange. The thrust washer is integrally connected -to said mounting portion of said seal. The thrust washer has a pair of radial contact surfaces at least one of which is a radial bearing surface.
The thrust washer is adapted to be positioned between and in contact with a pair of opposed radial faces of a pair of relatively axially and rotatably movable members for carrying an axial load while accommodatiny rotary motion therebetwecn.
The thrust washer extends radially inwardly from said radial flange of said seal.
another aspect of the invention pertains to a unitary seal and thrust washer comprising a seal including a mounting portion and an integral sealing portion, and a thrust washer integrally connected to said seal. The thrus-t washer has a pair o contact surfaces one of which is a radial bearing surface. The thrust washer includes an additional sealing lip separate from said sealing portion of~said seal and said thrust washer including a ring of resilient, elastomeric material and a liner of polytetra-fluoroethylene material on one radial surface thereof forming said bearing surface, and wherein said liner incl de, an ex-en-ion formiDg said additional sealing lip.
.
Another aspect o~ the invention pertains to an apparatus comprising a housing having a bore therethrough, a shaft extending through said bore and bein~ rotatably movable relative to said housing, and a unitary seal and thrust washer mounted on one of said housing and shaft for sealing the space between sald housing and shaf~ and comprising a seal including a moun~ng portion mounted on one of said housing and shaft and an integral sealing por-tion sealing against ~he other of said housing and shaft, and a thrust washer integrally connected to said seal and comprising a ring having a pair of con~act surfaces one of which is a bearing surface, The thrust washer is located between a radial fàce of said shaft and a relatively axially . movable radial face of said housing.
Another aspect of the invention pertains to an apparatus comprising a housing having a bore theret~rough, a shaft extending through said bore and being rotatably movable relative to said housing and a unitary seal ~ and thrust washer mounted sn one of said housing and shaft for s aling the space between said housing and shaft and comprising a seal including a mountin~ portion mounted on one o said housing and shaf~ and an integral sealing portion sealing against the other of said housing and shaft, and a thrust washer integrally connected to said seal and comprising a ring having a pair ~f contact surfaces one of which is a bearing sur~ace, The ~hrust washer is located between a radial face of ~aid shaE~ and a relativel.y axially movable radial acé o~ said housing wherein sald sea:ling ~ortion includes a pair o spaced-apart sea:lin~l lips, ~ncl wherein at least one of said sealing lips seals against a cylindrical surface of said shaft.
~l ,.. .
~r~
~ nother aspect of the invention pert~ins to an apparatus comprising a housing having a ~ore theret~rough, a shaft extending through said bore and being rotatably movable relative to said housing, and a unitary seal and thrust.washer mounted on one of said housing and shaft ~or sealing the space between said housing and sha~t and comprising a seal including a mounting portion mounted on one of said housing and sha~t and an integral sealing portion sealing against the other of said housin~ and shaft, and a thrust washer integrally connected to said seal and comprising a ring having a pair of contact surfaces one o~ which is a bearing surface. The thrust washer is located between a radial face o said shat and a relatively axially movable radial face of said housing and wherein said thrust washer i.ncludes an integral sealin~ lip separate from said sealing portion o~ said seal and wherein said thrust washe~ includes a backing layer ring of resilient elastomer and a bearing liner of polytetrafluoroethylene on one radial surface thereof and wherein said polytetra- .
fluoroethylene liner includes an extension forming said additional integral sealin~ lip.
. Another aspect o~ the invention pertains to a unitary seal and thrust washer comprising a seal including ~.
a mounting portion and an lntegral sealing portion and a thrust washer integrally connected to said seal. The thrust washer has a pair of con~act sur~aces one of whlch is a rad:Lal bearing surface~ and whereln said bearing surf~ce has - a low coefficient of rict;on and wherein ~ald thrust wahser includes a resilient backin~ layer and a llner bonded thereto having said bearing 6ur~ace of low coeficient of friction, and wheréin said unitary seal and thrust washer includes a resilient one-piece, molded bo~ly Eorming a~ least a rnaior portion o~ each of said mounting port-ion, .
said sealing portion, and said backl.n~ laye~ ~nd wherein said thrust washer ex~ends radially away Erom said seal and wherein said contact surfaces are substan~ially radial and are adapted to contact, respectively, a pair of substan~ially radial surfaces o~ a pair of relatively axially movable rnem-bers and to maintain said radial suraces o~ said members separated, and wherein said bearing surface is located on the same side of said thrus~ washer as is said sealing portion.
Another aspect of the invention pertains to a unitary seal and thrust washer comprising a seal including a mounting portion and an integral sealing por~ion, and a thrust washer integrally connected to said seal. The thrust wa~her has a pair of contac~ sur~aces one of which is a radial bearing surface, and ~herein said thrust washer extends radially away ~rom said seal and has a pair of radial contact surfaces adapted to contact, respectively, a pair of radial surfaces o~ a pair of relatively axlally movable members and to maintain said radial surfaces of said members separated and wherein said thrust washer extends radially inwardly rom said seal and w~erein said bearing surface is located on the same side of said thrust washer as is said sealing portion.
A unitary seal and thrust washer which, in the preerred embodimentj includes a resilient, one-piece, nolded elastomeric body forming the major part o~ both the seal and the thrust washer. The seal includes a mounting portion, preferably with an annular metal shell bonded to the elastomeric body, and a sealing porkion with, in a preferred embodiment, a pair of sealing lips. The inte~ral tl~rust - 30 washer is ring shaped and includes, in a preferred embodiment a polytetrafluoroethylene bearlng surEace In a yreferre~l embodimen~, the thrust washer includes an additional poly-tetrafluoroethylene sealing llp, ormed as an extension oE
the material of ~he poly~traflwaroet~ylene bearing surface :
Another aspect of this invention is the rubber-backed thrust washer per se, with an in-tegral sealiny lip, if desired, formed, for example, as an extension of the polytetrafluoroethylene liner that forms the bearing surface.
BRI~F DESCRIPTION OF THE DRAWIN~, The presen-t invention will be more fullv understood by reference to the following detailed descrlption thereof, when read in conjunction with the attached drawinys, wherein like reference numerals reEer to like elements and wherein:
Fig. l is a partial cross-sectional view through a preferired embodiment of a unitary seal and thrust washer according to the present invention, and Figs~ 2 and 3 are partial cross-sectional views through two different embodiments of thrust washers according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference now to the drawing, Fig. 1 shows a preferred embodiment of a unitary seal and thrust washer 10 accordin~ to the present invention as used in the preferred application in a bore 12 between a housing 14 (such as a dead spindle on a front wheel drive vehicle) and a shaft 16 (such as an axle or drive sha~t~ which is both rotatably and axially movable (to the position shown by phantom line 48~ relative to the housing 14 (alternatively, of course, the shaft 16 can be one that is stationary and the housiny can be movable, or there can be a combination of such movement).
5~
The unitary seal and thrust washer 10 comprises a seal 20 and a thrust washer 22 inteyrally connected to -the seal 20 with both the seal 20 and thrust washer 22 belng made or formed from a resilient one-piece, mo1ded, body 30 of elasto-meric material. While any known type of seal can be used and made unitary with the thrust washer 22, a preferred one is shown comprising a moun-ting portion 24 and a sealing por-tion 26. The mounting portion 24 includes an annula~ metal re-inforcing shell 28 bonded to the elastomeric body 3~. The sealing portion 26 includes a pair of sealing lips 34 and 36.
The thrust washer 22 comprises a ring 38 of resilient, elastomeric material having a beariny surface 58 of reduced coe~ficient of friction on one radial surface thereof. In the preferred embodiment, the surface of reduced coefficient of friction is provided by an annular liner ~0 of ~olytetra~luoro-ethylene bonded to said body of elastomeric material (as is known in the art, for example, by etching the polytetrafluoro-ethylene layer and providing a layer of adhesive between it and the elastomer and applying heat and pressure). The liner 40 can include an extension 42 forming an additional sealing lip 44 in addition -to the sealing portion 26. The thrust washer 22 is located between a radial surface 46 of the housing 14 and a radial surface 48 of the shaft 16. These radial surfaces 46 and 48 can move axially relatiYe to each other and thus the thrust washer 22,is not under loacl at all -times (in this particular application). The resllient rubher backing ~the layer o~ elastomeric material 38) prevents the ~rior art 3~
"poundiny out", and instead "~ives" a little blt, preventing t~is "pounding out" and also cushioning the blow an~ preventincJ
the shock build up. While -the backing layer 38 is pre~erably resilient, this is not essential to all aspects of this invention.
The mounting portion 24 of the seal 20 is installed with an interference fit (see, ~or example, the O.D. 60 of the seal 20 as molded) in the counterbore 52 and is moved axially up against a radial wall 50 of the housing 14.
In another aspect of this invention as described below in more detail with respect to Figs. 2 and 3, the thrust washer 22 can be used alone, separate from ~he seal 20.
The thr.ust washer has particular application (although it is not limited to use in such application) as a light duty thrust bearing where the thrust washer i5 not under load at all times and is thus subject to pounding between two axially movable members. The additional sealing lip 44 can be used, if desired, similarly as when the thrust washer 22 is unitized with a seal 20.
The additional sealing lip 44 can be formed (bent) to the sh~pe shown in Fiy. l if desired! Other materials can be used for the bearing surface..58, such as nylon where friction is a lesser problem, for better abrasion resistance.
The sealing portion 26 shown in Fig. 1 is designed for dirt exclusion but the present invention is not limited to such type of seal. Either or both of the sealiny lip.5 34 and 36 may be spring loaded, as is well-known in the art.
Fig. 2 shows a thrus-t washer ~8 according to another embodiment of the present invention installed between adjacent spaced-apar-t, radial surfaces 70 and 72 of a housing 74 and a shaft 76, respectively~ The thrust washer 68 comprises a resilient backing layer 78 and a polytetrafluoroethylene liner 80 bonded to the backing layer and providing a bearing surface 82. The thrust washer 68 includes a sealing lip 84 in contact with a cylindrical surface 86 of the shaft 76. The entire lip 1(~ 84 can be bonded to the resilient backing layer 78, for support, or it can be spaced therefrom as shown in Figs.
1 and 3.
Fig. 3 shows another thrust washer 90 of the present invention, installed between the housing 74 and shaft 76. The thrust washer 90 comprises a resilient backing layer 92 and a bearing liner 94, preferably of polytetrafluoroethylene. The liner 94 incluaes an extension 96 forming an inner sealing lip 98 and also an outer sealing lip 100. To urge the lip 100 against 20 the surface 72 it is curved away from the sur~ace 72 and then back toward the surface 72 and the lip 100 is backed up, and thus biased toward the surface 72, by the backing layer 92.
The invention has been described in detail with particular reference to the preferred embodiments thereof, ~ut it will be understood that variations and modleiclations can be effected within the spirit and scope of the invention as described hereinabove and as defined in the appended claims.
; Tl~e :Invetltlon has been dcscribe(:l ln ~let~ ltj;) p~rticular rererence ~o kh~ preferred em~odiMent;s thereof, but it will be understood that variations and modif'icatlons can be ef'rectecl within ~he splrit and SCC~p2 of the lnvention as described ~lereinabo~/e and as derined in ~he appende~d claimsO
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THRUST WASHER AND COMBINATION SEAL AND TIIRUST
WASHER METHOD AND APPAR~rrUS
BACKGROUND OF THE INVENTION
This application is a division o~ Canadian Serial No.
286,109, filed 5eptember 6, 1977.
Field oE the Inventlon ; This inven~ion relates to thrust washers and to seals and in particulax to an lmproved thrust washer and also to : a unitary combination of said improved thru~t washer and a seal.
' ~ :
.: .
; Description of the Prior Art _ In many applications, seals are used in proximity to thrust washers which can be, for example, ~ ring made of treated nylon material. These parts are purchased separately and installed separately. In addition, some applica-tions require the four separate parts of: (1) a metal, seal-retaining ring, (2) a primary seal, (3) a thrust washer, and (4) a secondary seal, which separate parts must be purchased separately and installed separately.
It is an object of the present invention to overcome such problems in the prior art and to provide a uni-tary seal and thrust washer.
~In prior art applications requiring thrust washers and which are not under load at all times, the prior art thrust washers have a tendency to "pound out" (plastics have a tendency to "plastic flow" which means, for exc~mple, that f a plastic thrust washer is hit enough time~ with no yive, it has a tendency to deform and change its shape or extrude slightly).
It is another object o~ the present invention to over-come such problems in the prior art by providing a resiliently-backed thrust washer and to also prevent shock build-up between two axially movable members. I-t is another object of ~he present invention to provide a rubber-backed thrust washer having an integral sealing lip.
SUMMARY_OF T~IE INVENl'ION
One aspect of the invention in a broad sense pertains to an article comprising a unitary seal and thrust washer com-prising a seal and a thrust waS}I~r integrally connected to ~2-s~
said seal. The seal includes a mounting por-tion and an inte-gral sealing portion. The mounting portion includes a cylindrical portion and a radial flange The cylindrical portion has an O.D. surface adapted to form a pxess-fi-t in a housing bore, and the sealing portion extends axially away from the radially inner end of said radial flange. The thrust washer is integrally connected -to said mounting portion of said seal. The thrust washer has a pair of radial contact surfaces at least one of which is a radial bearing surface.
The thrust washer is adapted to be positioned between and in contact with a pair of opposed radial faces of a pair of relatively axially and rotatably movable members for carrying an axial load while accommodatiny rotary motion therebetwecn.
The thrust washer extends radially inwardly from said radial flange of said seal.
another aspect of the invention pertains to a unitary seal and thrust washer comprising a seal including a mounting portion and an integral sealing portion, and a thrust washer integrally connected to said seal. The thrus-t washer has a pair o contact surfaces one of which is a radial bearing surface. The thrust washer includes an additional sealing lip separate from said sealing portion of~said seal and said thrust washer including a ring of resilient, elastomeric material and a liner of polytetra-fluoroethylene material on one radial surface thereof forming said bearing surface, and wherein said liner incl de, an ex-en-ion formiDg said additional sealing lip.
.
Another aspect o~ the invention pertains to an apparatus comprising a housing having a bore therethrough, a shaft extending through said bore and bein~ rotatably movable relative to said housing, and a unitary seal and thrust washer mounted on one of said housing and shaft for sealing the space between sald housing and shaf~ and comprising a seal including a moun~ng portion mounted on one of said housing and shaft and an integral sealing por-tion sealing against ~he other of said housing and shaft, and a thrust washer integrally connected to said seal and comprising a ring having a pair of con~act surfaces one of which is a bearing surface, The thrust washer is located between a radial fàce of said shaft and a relatively axially . movable radial face of said housing.
Another aspect of the invention pertains to an apparatus comprising a housing having a bore theret~rough, a shaft extending through said bore and being rotatably movable relative to said housing and a unitary seal ~ and thrust washer mounted sn one of said housing and shaft for s aling the space between said housing and shaft and comprising a seal including a mountin~ portion mounted on one o said housing and shaf~ and an integral sealing portion sealing against the other of said housing and shaft, and a thrust washer integrally connected to said seal and comprising a ring having a pair ~f contact surfaces one of which is a bearing sur~ace, The ~hrust washer is located between a radial face of ~aid shaE~ and a relativel.y axially movable radial acé o~ said housing wherein sald sea:ling ~ortion includes a pair o spaced-apart sea:lin~l lips, ~ncl wherein at least one of said sealing lips seals against a cylindrical surface of said shaft.
~l ,.. .
~r~
~ nother aspect of the invention pert~ins to an apparatus comprising a housing having a ~ore theret~rough, a shaft extending through said bore and being rotatably movable relative to said housing, and a unitary seal and thrust.washer mounted on one of said housing and shaft ~or sealing the space between said housing and sha~t and comprising a seal including a mounting portion mounted on one of said housing and sha~t and an integral sealing portion sealing against the other of said housin~ and shaft, and a thrust washer integrally connected to said seal and comprising a ring having a pair of contact surfaces one o~ which is a bearing surface. The thrust washer is located between a radial face o said shat and a relatively axially movable radial face of said housing and wherein said thrust washer i.ncludes an integral sealin~ lip separate from said sealing portion o~ said seal and wherein said thrust washe~ includes a backing layer ring of resilient elastomer and a bearing liner of polytetrafluoroethylene on one radial surface thereof and wherein said polytetra- .
fluoroethylene liner includes an extension forming said additional integral sealin~ lip.
. Another aspect o~ the invention pertains to a unitary seal and thrust washer comprising a seal including ~.
a mounting portion and an lntegral sealing portion and a thrust washer integrally connected to said seal. The thrust washer has a pair of con~act sur~aces one of whlch is a rad:Lal bearing surface~ and whereln said bearing surf~ce has - a low coefficient of rict;on and wherein ~ald thrust wahser includes a resilient backin~ layer and a llner bonded thereto having said bearing 6ur~ace of low coeficient of friction, and wheréin said unitary seal and thrust washer includes a resilient one-piece, molded bo~ly Eorming a~ least a rnaior portion o~ each of said mounting port-ion, .
said sealing portion, and said backl.n~ laye~ ~nd wherein said thrust washer ex~ends radially away Erom said seal and wherein said contact surfaces are substan~ially radial and are adapted to contact, respectively, a pair of substan~ially radial surfaces o~ a pair of relatively axially movable rnem-bers and to maintain said radial suraces o~ said members separated, and wherein said bearing surface is located on the same side of said thrus~ washer as is said sealing portion.
Another aspect of the invention pertains to a unitary seal and thrust washer comprising a seal including a mounting portion and an integral sealing por~ion, and a thrust washer integrally connected to said seal. The thrust wa~her has a pair of contac~ sur~aces one of which is a radial bearing surface, and ~herein said thrust washer extends radially away ~rom said seal and has a pair of radial contact surfaces adapted to contact, respectively, a pair of radial surfaces o~ a pair of relatively axlally movable members and to maintain said radial surfaces of said members separated and wherein said thrust washer extends radially inwardly rom said seal and w~erein said bearing surface is located on the same side of said thrust washer as is said sealing portion.
A unitary seal and thrust washer which, in the preerred embodimentj includes a resilient, one-piece, nolded elastomeric body forming the major part o~ both the seal and the thrust washer. The seal includes a mounting portion, preferably with an annular metal shell bonded to the elastomeric body, and a sealing porkion with, in a preferred embodiment, a pair of sealing lips. The inte~ral tl~rust - 30 washer is ring shaped and includes, in a preferred embodiment a polytetrafluoroethylene bearlng surEace In a yreferre~l embodimen~, the thrust washer includes an additional poly-tetrafluoroethylene sealing llp, ormed as an extension oE
the material of ~he poly~traflwaroet~ylene bearing surface :
Another aspect of this invention is the rubber-backed thrust washer per se, with an in-tegral sealiny lip, if desired, formed, for example, as an extension of the polytetrafluoroethylene liner that forms the bearing surface.
BRI~F DESCRIPTION OF THE DRAWIN~, The presen-t invention will be more fullv understood by reference to the following detailed descrlption thereof, when read in conjunction with the attached drawinys, wherein like reference numerals reEer to like elements and wherein:
Fig. l is a partial cross-sectional view through a preferired embodiment of a unitary seal and thrust washer according to the present invention, and Figs~ 2 and 3 are partial cross-sectional views through two different embodiments of thrust washers according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference now to the drawing, Fig. 1 shows a preferred embodiment of a unitary seal and thrust washer 10 accordin~ to the present invention as used in the preferred application in a bore 12 between a housing 14 (such as a dead spindle on a front wheel drive vehicle) and a shaft 16 (such as an axle or drive sha~t~ which is both rotatably and axially movable (to the position shown by phantom line 48~ relative to the housing 14 (alternatively, of course, the shaft 16 can be one that is stationary and the housiny can be movable, or there can be a combination of such movement).
5~
The unitary seal and thrust washer 10 comprises a seal 20 and a thrust washer 22 inteyrally connected to -the seal 20 with both the seal 20 and thrust washer 22 belng made or formed from a resilient one-piece, mo1ded, body 30 of elasto-meric material. While any known type of seal can be used and made unitary with the thrust washer 22, a preferred one is shown comprising a moun-ting portion 24 and a sealing por-tion 26. The mounting portion 24 includes an annula~ metal re-inforcing shell 28 bonded to the elastomeric body 3~. The sealing portion 26 includes a pair of sealing lips 34 and 36.
The thrust washer 22 comprises a ring 38 of resilient, elastomeric material having a beariny surface 58 of reduced coe~ficient of friction on one radial surface thereof. In the preferred embodiment, the surface of reduced coefficient of friction is provided by an annular liner ~0 of ~olytetra~luoro-ethylene bonded to said body of elastomeric material (as is known in the art, for example, by etching the polytetrafluoro-ethylene layer and providing a layer of adhesive between it and the elastomer and applying heat and pressure). The liner 40 can include an extension 42 forming an additional sealing lip 44 in addition -to the sealing portion 26. The thrust washer 22 is located between a radial surface 46 of the housing 14 and a radial surface 48 of the shaft 16. These radial surfaces 46 and 48 can move axially relatiYe to each other and thus the thrust washer 22,is not under loacl at all -times (in this particular application). The resllient rubher backing ~the layer o~ elastomeric material 38) prevents the ~rior art 3~
"poundiny out", and instead "~ives" a little blt, preventing t~is "pounding out" and also cushioning the blow an~ preventincJ
the shock build up. While -the backing layer 38 is pre~erably resilient, this is not essential to all aspects of this invention.
The mounting portion 24 of the seal 20 is installed with an interference fit (see, ~or example, the O.D. 60 of the seal 20 as molded) in the counterbore 52 and is moved axially up against a radial wall 50 of the housing 14.
In another aspect of this invention as described below in more detail with respect to Figs. 2 and 3, the thrust washer 22 can be used alone, separate from ~he seal 20.
The thr.ust washer has particular application (although it is not limited to use in such application) as a light duty thrust bearing where the thrust washer i5 not under load at all times and is thus subject to pounding between two axially movable members. The additional sealing lip 44 can be used, if desired, similarly as when the thrust washer 22 is unitized with a seal 20.
The additional sealing lip 44 can be formed (bent) to the sh~pe shown in Fiy. l if desired! Other materials can be used for the bearing surface..58, such as nylon where friction is a lesser problem, for better abrasion resistance.
The sealing portion 26 shown in Fig. 1 is designed for dirt exclusion but the present invention is not limited to such type of seal. Either or both of the sealiny lip.5 34 and 36 may be spring loaded, as is well-known in the art.
Fig. 2 shows a thrus-t washer ~8 according to another embodiment of the present invention installed between adjacent spaced-apar-t, radial surfaces 70 and 72 of a housing 74 and a shaft 76, respectively~ The thrust washer 68 comprises a resilient backing layer 78 and a polytetrafluoroethylene liner 80 bonded to the backing layer and providing a bearing surface 82. The thrust washer 68 includes a sealing lip 84 in contact with a cylindrical surface 86 of the shaft 76. The entire lip 1(~ 84 can be bonded to the resilient backing layer 78, for support, or it can be spaced therefrom as shown in Figs.
1 and 3.
Fig. 3 shows another thrust washer 90 of the present invention, installed between the housing 74 and shaft 76. The thrust washer 90 comprises a resilient backing layer 92 and a bearing liner 94, preferably of polytetrafluoroethylene. The liner 94 incluaes an extension 96 forming an inner sealing lip 98 and also an outer sealing lip 100. To urge the lip 100 against 20 the surface 72 it is curved away from the sur~ace 72 and then back toward the surface 72 and the lip 100 is backed up, and thus biased toward the surface 72, by the backing layer 92.
The invention has been described in detail with particular reference to the preferred embodiments thereof, ~ut it will be understood that variations and modleiclations can be effected within the spirit and scope of the invention as described hereinabove and as defined in the appended claims.
; Tl~e :Invetltlon has been dcscribe(:l ln ~let~ ltj;) p~rticular rererence ~o kh~ preferred em~odiMent;s thereof, but it will be understood that variations and modif'icatlons can be ef'rectecl within ~he splrit and SCC~p2 of the lnvention as described ~lereinabo~/e and as derined in ~he appende~d claimsO
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Claims (10)
1. Apparatus comprising a housing having a bore therethrough, a shaft extending through said bore and being rotatably movable relative to said housing, and a unitary seal and thrust washer mounted on one of said housing and shaft for sealing the space between said housing and shaft and comprising a seal including a mounting portion mounted on one of said housing and shaft and an integral sealing portion sealing against the other of said housing and shaft, and a thrust washer integrally connected to said seal and comprising a ring having a pair of contact surfaces one of which is a bearing surface, said thrust washer being located between a radial face of said shaft and a relatively axially movable radial face of said housing.
2. The apparatus according to Claim 2 wherein said combination seal and thrust washer includes a resilient one-piece molded body forming at least a major portion of each of said mounting portion and said sealing portion and forming a backing layer o said thrust washer, and including a layer of polytetrafluoroethylene bonded to one radial surface of said ring and forming said bearing surface.
3. The apparatus according to Claim 1 wherein said sealing portion includes at least one sealing lip for sealing against a cylindrical surface of said shaft.
4. Apparatus comprising a housing having a bore there-through, a shaft extending through said bore and being rotatably movable relative to said housing and a unitary seal and thrust washer mounted on one of said housing and shaft for sealing the space between said housing and shaft and comprising a seal including a mounting portion mounted on one of said housing and shaft and an integral sealing portion sealing against the other of said housing and shaft, and a thrust washer integrally connected to said seal and comprising a ring having a pair of contact surfaces one of which is a bearing surface, said thrust washer being located between a radial face of said shaft and a relatively axially movable radial face of said housing wherein said sealing portion includes a pair of spaced-apart sealing lips, and wherein at least one of said sealing lips seals against a cylindrical surface of said shaft.
5. The apparatus according to Claim 1 wherein said thrust washer includes an additional integral sealing lip separate from said sealing portion of said seal.
6. The apparatus according to Claim wherein said thrust washer includes a backing layer ring of resilient elastomer and a bearing liner of polytetrafluoroethylene on one radial surface thereof.
7. Apparatus comprising a housing having a bore there-through, a shaft extending through said bore and being rotatably movable relative to said housing, and a unitary seal and thrust washer mounted on one of said housing and shaft for sealing the space between said housing and shaft and comprising a seal including a mounting portion mounted on one of said housing and shaft and an integral sealing portion sealing against the other of said housing and shaft, and a thrust washer integrally connected to said seal and comprising a ring having a pair of contact surfaces one of which is a bearing surface, said thrust washer being located between a radial face of said shaft and a relatively axially movable radial face of said housing and wherein said thrust washer includes an integral sealing lip separate from said sealing portion of said seal and wherein said thrust washer includes a backing layer ring of resilient elastomer and a bearing liner of polytetrafluoroethylene on one radial surface thereof and wherein said polytetrafluoro-ethylene liner includes an extension forming said additional integral sealing lip.
8. The article according to Claim 1 wherein said bearing surface has a low coefficient of friction and wherein said thrust washer includes a resilient backing layer and a liner bonded thereto having said bearing surface of low coefficient of friction.
9. The article according to Claim 8 wherein said unitary seal and thrust washer includes a resilient one-piece, molded body forming at least a major portion of each of said mounting portion and seal sealing portion.
10. The article according to Claim 9 wherein said thrust washer extends radially inwardly from said seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA361,861A CA1109501A (en) | 1976-10-19 | 1980-10-08 | Thrust washer and combination seal and thrust washer method and apparatus |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/733,890 US4166627A (en) | 1976-10-19 | 1976-10-19 | Thrust washer and combination seal and thrust washer |
| CA286,109A CA1107313A (en) | 1976-10-19 | 1977-09-06 | Thrust washer and combination seal and thrust washer method and apparatus |
| CA361,861A CA1109501A (en) | 1976-10-19 | 1980-10-08 | Thrust washer and combination seal and thrust washer method and apparatus |
| US733,890 | 1991-07-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1109501A true CA1109501A (en) | 1981-09-22 |
Family
ID=27165267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA361,861A Expired CA1109501A (en) | 1976-10-19 | 1980-10-08 | Thrust washer and combination seal and thrust washer method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1109501A (en) |
-
1980
- 1980-10-08 CA CA361,861A patent/CA1109501A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |