GB2219832A - Annular seal - Google Patents

Annular seal Download PDF

Info

Publication number
GB2219832A
GB2219832A GB8814186A GB8814186A GB2219832A GB 2219832 A GB2219832 A GB 2219832A GB 8814186 A GB8814186 A GB 8814186A GB 8814186 A GB8814186 A GB 8814186A GB 2219832 A GB2219832 A GB 2219832A
Authority
GB
United Kingdom
Prior art keywords
seal
face
axial
body portion
bearing assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8814186A
Other versions
GB8814186D0 (en
Inventor
Simon Brown
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
West & Son
Original Assignee
West & Son
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by West & Son filed Critical West & Son
Priority to GB8814186A priority Critical patent/GB2219832A/en
Publication of GB8814186D0 publication Critical patent/GB8814186D0/en
Priority to PCT/GB1989/000657 priority patent/WO1989012761A1/en
Priority to AU38484/89A priority patent/AU3848489A/en
Priority to ZA894523A priority patent/ZA894523B/en
Publication of GB2219832A publication Critical patent/GB2219832A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3436—Pressing means
    • F16J15/3456—Pressing means without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/30—Angles, e.g. inclinations

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)

Abstract

An annular seal (20) for providing a seal between the inner and outer race of a roller or ball bearing assembly, the seal being a unitary moulding of a suitable plastics material and including a body portion (21) having an axial inner face (23) for abutment with an axial face of one of said races, and a lip portion (22) extending radially from the body portion and having a terminal face (24) for abutment with an axial face of the other of said races.

Description

ANNULAR SEAL The present invention relates to an annular seal, in particular an annular seal for sealing a roller or ball bearing assembly.
In the context of the present invention, a roller or ball bearing assembly includes an inner and outer race separated by a plurality of balls or rollers. In use lubricating grease is applied to the space between the inner and outer races which is also occupied by the balls or rollers. It is a particular aim of the present invention to provide an annular seal which is able to create a seal between the inner and outer races of the bearing assembly in order to retain lubricating grease therein and prevent ingress of contaminants such as dirt.
According to one aspect of the present invention there is provided an annular seal for providing a seal between the inner and outer race of a roller or ball bearing assembly, the seal being a unitary moulding of a suitable plastics material and including a body portion having an axial inner face for abutment with an axial face of one of said races, and a lip portion extending radially from the bod portion and having a terminal face for abutment ith an axial face of the other of said races.
Reference is now made to the accompanying dris, in which:- Figure 1 is an axial section through a bearing assembly sealed by a pair of seals according to the present invention; and Figure 2 is an axial section through an alternate seal according to the present invention.
Referring initially to Figure 1 there is shown a bearing assembly 10 having an inner race 11 and an outer race 12. Located betteen the races 11, 12 are a plurality; of balls 14 which are spaced circumferentially about the races 11, 12. An annular gap 16 is defined between the inner and outer races 11, 12 and. this gap 16 is filled with a lubricating grease (not shown) in accordance with conventional practice.
The inner race 11 is located on a shaft 17 and outer race 12 is located in a bore 18 formed in a supporting body 19. Thus the shaft 17 is rotatably supported relative to body 19 br the bearing assembly 10. It will be appreciated that the shaft 17 may be intended to rotate whilst the body 19 remains stationary, or that the shaft 17 may be intended to be stationary whilst the body 19 rotates about the shaft 17.
A pair of seals 20 are provided, one on either axial side of the bearing assembly 10. Each seal 20 includes a body portion 21 and a radially inwardly directed lip portion 22. The radial dimension of the seal 20 is sufficient for the seal 20 to bridge the gap 16. The body portion 21 has an axial inner face 23 which as shown in Figure 1 abuts against the opposed axial face of the outer race 12. The lip portion 22 extends from the opposite axial outer side of the bod portion 21 to abut with its terminal face 24 against the opposed axial face of the inner race 11.
In the relased condition of the seal 20, the terminal face 24 of the lip portion 22 extends axially in'wardly beyond the axial face 23 of the body portion 21 so that when the axial face 23 abuts against the outer race 12, the lip portion 22 is placed under an axial loading. This axial loading of the lip portion 22 causes the terminal face 24 to be biased into contact with the inner race 11.
In order to maintain the axial face 23 of the body portion 21 in face to face contact with the outer race 12, the seal 20 is provided with an axially extending annular flange 28 located at the outer periphery of the seal 20. The flange 28 has a radially inwardly directed barb-like formation 29 which is seated in a complementary shaped annular groove 30 formed in the outer periphery of the outer race 12, the flange 28 and groove 30 cooperating with one another to restrain axial separation.
Preferably, the outer periphery of the seal body portion 21 is slightly conical having a greater diameter at the outer axial side of the seal 20. The smaller diameter of the conical outer periphery is substantially the same as the outer diameter of the outer race 12 so that the larger diameter of the conical outer periphery is greater than the outer diameter of the outer race 12.
Thus when the seal 20 is located in bore 18 it is radially compressed by a progressively greater amount from its axially inner to its axially outer side. This has the effect of creating a twisting loading about the outer edge 25 of the outer race thereby urging the axial inner face 23 into abutment with the outer race. The outer peripheral edge 36 of the seal 20 is preferably chamfered to facilitate entry of the seal 20 into bore 13.
If desired, the seal 20 may be bonded to the bearing assembly 10 by, for example, the provision of a suitable adhesive between the axially inner face 23 and the opposed axial face of the outer race 12. The provision of adhesi;-e assists in providing a seal between the body portion 21 and the outer race. In addition the conical outer periphery of the seal may be dispensed with when adhesive is used.
It is envisage that the annular flange 28 may be dispensed with and that the axial inner face 23 be maintained in abutment with the opposed axial face of the outer race 12 either by bonding, as indicated above, or b mechanically sandwiching the bearing assembly 10 between a pair of seals 20. A seal 20 of this type is illustrated in Figure 2 wherein the reference numerals used in Figure 1 have been used to indicate like parts in Figure 2.
In Figure 2, the seal 20 is illustrated in a relaxed condition and it will be clearly seen that the terminal face 24 of the lip portion 22 extends axially inwardly beyond the axial inner face 23 of the body portion.
The seal 20 is preferably moulded by an injection moulding process from a suitable plastics material, preferably an elastomer, such as polyester elastomer.
The degree of inwardly directed bias on the lip portion 22 may be altered to suit specific applications by altering the radial length of the lip portion and/or its axial thickness.
It will be appreciated that, if desired, the radial positions of the body portion 21 and lip portion 22 may be reversed so that the body portion 21 abuts against the inner race 11 and the lip portion 22 abuts against the outer race 12.
The above described seal 20 provides an effective seal even if the shaft 17 undergoes lateral displacement relative to the body 19 since the lip portion 23 seals against the axial face of the inner race (or outer race) and therefore remains in sealing contact. In addition, the axial bias of the lip portion 22 serves to accommodate axial displacement of the shaft 1; relatIve to the body 19 and thereby maintains sealing contact.
The seal 20 also provides little resistance to relative rotation of the races 11, 12. This arises since the resistance against such rotation results from sliding contact of the terminal face 24 over the opposed axial face of the inner race 11. The terminal face 24 has a relatively small contact area with the inner race 11 and thereby generates little friction.

Claims (5)

1. An annular seal for providing a seal between the inner and outer race of a roller or ball bearing assembly, the seal being a unitary moulding of a suitable plastics material and including a body portion having an axial inner face for abutment with an axial face of one of said races, and a lip portion extending radially from the body portion and having a terminal face for abutment with an axial face of the other of said races.
2. A seal according to Claim 1 wherein the lip portion extends radially from the axially outer side of the body portion and, in the relaxed condition of the seal, extends axially inwardly of the body portion to project beyond the axial inner face of the body portion.
3. A seal according to Claim 1 or 2 wherein the body portion is positioned radially outwardly of the lip portion and is provided with an axially extending flange portion for attachment to the outer race of the bearing assembly.
4. An annular seal substantially as described herein with reference to the accompanying drawings.
5. In combination, a roller or ball bearing assembly and a pair of annular seals according to any preceding claim.
GB8814186A 1988-06-15 1988-06-15 Annular seal Withdrawn GB2219832A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB8814186A GB2219832A (en) 1988-06-15 1988-06-15 Annular seal
PCT/GB1989/000657 WO1989012761A1 (en) 1988-06-15 1989-06-13 Annular seal
AU38484/89A AU3848489A (en) 1988-06-15 1989-06-13 Annular seal
ZA894523A ZA894523B (en) 1988-06-15 1989-06-14 Annular seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8814186A GB2219832A (en) 1988-06-15 1988-06-15 Annular seal

Publications (2)

Publication Number Publication Date
GB8814186D0 GB8814186D0 (en) 1988-07-20
GB2219832A true GB2219832A (en) 1989-12-20

Family

ID=10638719

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8814186A Withdrawn GB2219832A (en) 1988-06-15 1988-06-15 Annular seal

Country Status (4)

Country Link
AU (1) AU3848489A (en)
GB (1) GB2219832A (en)
WO (1) WO1989012761A1 (en)
ZA (1) ZA894523B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2372886A (en) * 2001-04-02 2002-09-04 Minebea Co Ltd Bearing assembly for a brushless dc motor
WO2003095856A1 (en) * 2002-05-10 2003-11-20 Polymer Sealing Solutions Ltd Static seal between a bearing ring and a shaft

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3039602B1 (en) * 2015-07-29 2018-01-26 Aktiebolaget Skf BEARING ASSEMBLY

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB811357A (en) * 1956-07-25 1959-04-02 Burtonwood Engineering Company Improvements in seals for bearings
GB811356A (en) * 1956-05-12 1959-04-02 Burtonwood Engineering Company Improvements in seals for bearings
GB852993A (en) * 1958-03-01 1960-11-02 Burtonwood Engineering Company Improvements in seals for bearings
GB1014593A (en) * 1963-02-15 1965-12-31 Koyo Seiko Company Ltd Improvements in relating to bearings
GB1113449A (en) * 1964-06-16 1968-05-15 Riv Officine Di Villar Perosa Sealing means for ball or roller bearings
GB1138193A (en) * 1965-02-23 1968-12-27 Angus George Co Ltd Improvements in and relating to bearing seals
US3519316A (en) * 1967-06-16 1970-07-07 Skf Svenska Kullagerfab Ab Rolling bearing unit
GB1228971A (en) * 1967-06-29 1971-04-21
GB1391921A (en) * 1971-03-29 1975-04-23 Forsheda Ideutveckling Ab Locking and sealing device
GB1530987A (en) * 1976-11-02 1978-11-01 Koyo Seiko Co Antifriction bearing including a seal assembly
US4191432A (en) * 1977-09-26 1980-03-04 Koyo Seiko Company Limited Seal assembly for bearing
GB2173866A (en) * 1985-04-18 1986-10-22 Torrington Co Improvements in and relating to seals for bearings

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2549465A1 (en) * 1975-11-05 1977-05-18 Acla Werke Ag Annular seal for rolling bearing - deforms on assembly of one portion to impart sealing force to other portion
DE2824687A1 (en) * 1978-06-06 1979-12-13 Thyssen Aufzuege Gmbh Clamping ring for roller bearings - has supporting shoulder and sealing lip for inside race
FR2479374A1 (en) * 1980-03-28 1981-10-02 Nippon Seiko Kk Seal for ball or roller bearing - has intermediate lip with divided contact region arranged between inner and outer lips
GB8333985D0 (en) * 1983-12-21 1984-02-01 Skf Uk Ltd Seals for bearings

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB811356A (en) * 1956-05-12 1959-04-02 Burtonwood Engineering Company Improvements in seals for bearings
GB811357A (en) * 1956-07-25 1959-04-02 Burtonwood Engineering Company Improvements in seals for bearings
GB852993A (en) * 1958-03-01 1960-11-02 Burtonwood Engineering Company Improvements in seals for bearings
GB1014593A (en) * 1963-02-15 1965-12-31 Koyo Seiko Company Ltd Improvements in relating to bearings
GB1113449A (en) * 1964-06-16 1968-05-15 Riv Officine Di Villar Perosa Sealing means for ball or roller bearings
GB1138193A (en) * 1965-02-23 1968-12-27 Angus George Co Ltd Improvements in and relating to bearing seals
US3519316A (en) * 1967-06-16 1970-07-07 Skf Svenska Kullagerfab Ab Rolling bearing unit
GB1228971A (en) * 1967-06-29 1971-04-21
GB1391921A (en) * 1971-03-29 1975-04-23 Forsheda Ideutveckling Ab Locking and sealing device
GB1530987A (en) * 1976-11-02 1978-11-01 Koyo Seiko Co Antifriction bearing including a seal assembly
US4191432A (en) * 1977-09-26 1980-03-04 Koyo Seiko Company Limited Seal assembly for bearing
GB2173866A (en) * 1985-04-18 1986-10-22 Torrington Co Improvements in and relating to seals for bearings

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2372886A (en) * 2001-04-02 2002-09-04 Minebea Co Ltd Bearing assembly for a brushless dc motor
GB2372886B (en) * 2001-04-02 2003-12-03 Minebea Co Ltd A bearing assembly
WO2003095856A1 (en) * 2002-05-10 2003-11-20 Polymer Sealing Solutions Ltd Static seal between a bearing ring and a shaft
GB2388409B (en) * 2002-05-10 2005-08-31 Polymer Sealing Solutions Ltd Seal
CN100380008C (en) * 2002-05-10 2008-04-09 特雷勒伯格密封溶液英国有限公司 Static seal between a bearing ring and a shaft

Also Published As

Publication number Publication date
WO1989012761A1 (en) 1989-12-28
ZA894523B (en) 1990-03-28
AU3848489A (en) 1990-01-12
GB8814186D0 (en) 1988-07-20

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)