GB2134994A - A sealing boot - Google Patents

A sealing boot Download PDF

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Publication number
GB2134994A
GB2134994A GB08401678A GB8401678A GB2134994A GB 2134994 A GB2134994 A GB 2134994A GB 08401678 A GB08401678 A GB 08401678A GB 8401678 A GB8401678 A GB 8401678A GB 2134994 A GB2134994 A GB 2134994A
Authority
GB
United Kingdom
Prior art keywords
boot
ofthe
shaft
muff
component
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.)
Granted
Application number
GB08401678A
Other versions
GB2134994B (en
GB8401678D0 (en
Inventor
Leslie George Fisher
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.)
BRD Co Ltd
Original Assignee
BRD Co Ltd
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
Priority claimed from GB838302892A external-priority patent/GB8302892D0/en
Application filed by BRD Co Ltd filed Critical BRD Co Ltd
Priority to GB08401678A priority Critical patent/GB2134994B/en
Publication of GB8401678D0 publication Critical patent/GB8401678D0/en
Publication of GB2134994A publication Critical patent/GB2134994A/en
Application granted granted Critical
Publication of GB2134994B publication Critical patent/GB2134994B/en
Expired legal-status Critical Current

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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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
    • F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
    • F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the cover
    • 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
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • 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
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows
    • F16J3/041—Non-metallic bellows
    • 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
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows
    • F16J3/048—Bellows with guiding or supporting means
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
    • F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
    • F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the cover
    • F16D2003/846—Venting arrangements for flexible seals, e.g. ventilation holes
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
    • F16D3/06—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted to allow axial displacement

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Diaphragms And Bellows (AREA)

Abstract

A flexible sealing boot 13 for a rotary component such as a sliding spline assembly or a universal joint, has an annular attachment portion 15 which seals by its own resilience on a part of the component and is arranged to lift therefrom under centrifugal force in use to provide a vent passage to the interior of the boot. The boot may have an additional mass 19 of the same material as the boot provided at one place on its annular portion to lift under centrifugal force. If the attachment portions of the boot are of different diameters, it is usually preferable for the one of smaller diameter to lift under centrifugal force. <IMAGE>

Description

SPECIFICATION Sealing boot This invention relates to a flexible sealing boot for a rotary component.
Flexible sealing boots, usually made of a type of rubber or elastic plastics material, are commonly used to retain lubricant in and exclude dirtfrom rotary components. By way of example, the rotary component may be a sliding spline connection, in which case the boot has to accommodate relative axial movement between two members, or a universal joint which the boot has to accommodate, alternatively or in addition, relative articulation between two members. One problem associated with such use of a sealing boot is that if it is completely airtight it can inflate or collapse with temperature changes or the operational geometrical changes ofthe rotary component. If some form of vent is provided to overcome this problem, it is possible for lubricant to escape from the boot or dirt or waterto enter, particularly when the component is at rest and it lies in an unfavourable position.It has been proposed to provide a centrifugal breathervalvefor a rotarycomponent,which openstoprovideavent passage to the interior ofthe bootwhenthecompo- nent is rotating above a certain speed, when escape of lubricant or entry of undesirable matter should not be likely to occur. However, the provision of such a breather valve entails additional complexity and expense.
The present invention provides a flexible sealing boot for a rotary component, including an annular portion adapted by its own resilience to form a seal on a part of the component and having a formation adapted to liftfrom said part under centrifugal force when rotating above a predetermine speed, to provide a vent passage to the interior ofthe boot.
Thus, by suitably arranging for part ofthe annular portionofthebootto liftundercentrifugalforcefrom the component which it seals, the complication of providing a separate centrifugal valve for venting the interior of the boot is avoided.
Said formation preferably comprises an additional mass of the material ofthe boot at one place on said annular portion. This is easy to incorporate in the boot during a moulding process by which such boots are usually made.
The invention also provides a sliding splined joint having a sealing boot as above set forth.
The invention will now be described byway of example with reference to the accompanying drawing, which is a partial section through a sliding spline assembly provided with a boot according to the invention.
The illustrated assembly comprises a shaft 10 having an externallysplined end portion 11 .Thisfits within a muff 12 with internal splines which interfit with the splines of the shaft portion 11 such that the shaft and muffareconnectedfortorquetransmission and relative axial movement.
To retain lubricant in, and exclude dirtfrom,the splined connection between the shaft and muff, there is provided a flexible sealing boot 13 of a suitable rubber or other elastic material. The boot comprises a firstannularattachmentportion 14, a second annular attachment portion 15, and a bellows portion 16 therebetween. The portion 14 extends around and forms an airtight seal with the end ofthe muff 12, and has an inwardly extending annular protusion 17 which seats in a corresponding groove extending around the exterior of the muff. The portion 15 has an inwardly extending sealing lip 18 which engages the surface of shaft 10 to provide a seal therewith, at leastwhn.the assembly isstationary.
At one point around the periphery of portion 15, the boot has an additional mass 19. This is ofthe same material as the rest ofthe boot, and is incorporated therein during manofacturethereof, usually by a moulding process. tJndercentrifugal force,whenwhen the assembly is rotating akove a certain speed, this additional mass 19 will causethesealing lip 18to lift away from the shaft 10 and establish a vent passage to the interior of the boot. The problems above referred to, of inflation or collapse ofthe boot when the shaft and muff move axially relative to one another, are thus overcome. When the assembly is rotating, escape of lubricant or entry of dirt through the vent passage is not likely to be a problem.
Ifthe attachment portions ofthe boot are of different diameters, it is usually preferable that the one adapted to lift underthe centrifugal force is the one of smaller diameter, as any lubricant contained by the boot will tend to occupy the part ofthe boot which is ofgreater diameter, and is thus less likely to escape when the passage to the interior of the boot is established.
1. A flexible sealing boot for a rotary component, including an annular portion adapted by its own resilience to form a seal on a part of the component and having a formation adapted to liftfrom said part under centrifugal force when rotating above a predetermined speed, to provide a vent passage to the interior ofthe boot.
2. A sealing boot according to claim 1 wherein said formation comprises an additional mass provided at one part of said annular portion thereof.
3. Sealing boot substantially as hereinbefore described with reference to the accompanying drawing.
4. A sliding splinedjoint, comprising a shaft and a muff connected fortorque transmission and relative axial movementtherebetween, and having a sealing boot according to any one of the preceding claims.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Sealing boot This invention relates to a flexible sealing boot for a rotary component. Flexible sealing boots, usually made of a type of rubber or elastic plastics material, are commonly used to retain lubricant in and exclude dirtfrom rotary components. By way of example, the rotary component may be a sliding spline connection, in which case the boot has to accommodate relative axial movement between two members, or a universal joint which the boot has to accommodate, alternatively or in addition, relative articulation between two members. One problem associated with such use of a sealing boot is that if it is completely airtight it can inflate or collapse with temperature changes or the operational geometrical changes ofthe rotary component. If some form of vent is provided to overcome this problem, it is possible for lubricant to escape from the boot or dirt or waterto enter, particularly when the component is at rest and it lies in an unfavourable position.It has been proposed to provide a centrifugal breathervalvefor a rotarycomponent,which openstoprovideavent passage to the interior ofthe bootwhenthecompo- nent is rotating above a certain speed, when escape of lubricant or entry of undesirable matter should not be likely to occur. However, the provision of such a breather valve entails additional complexity and expense. The present invention provides a flexible sealing boot for a rotary component, including an annular portion adapted by its own resilience to form a seal on a part of the component and having a formation adapted to liftfrom said part under centrifugal force when rotating above a predetermine speed, to provide a vent passage to the interior ofthe boot. Thus, by suitably arranging for part ofthe annular portionofthebootto liftundercentrifugalforcefrom the component which it seals, the complication of providing a separate centrifugal valve for venting the interior of the boot is avoided. Said formation preferably comprises an additional mass of the material ofthe boot at one place on said annular portion. This is easy to incorporate in the boot during a moulding process by which such boots are usually made. The invention also provides a sliding splined joint having a sealing boot as above set forth. The invention will now be described byway of example with reference to the accompanying drawing, which is a partial section through a sliding spline assembly provided with a boot according to the invention. The illustrated assembly comprises a shaft 10 having an externallysplined end portion 11 .Thisfits within a muff 12 with internal splines which interfit with the splines of the shaft portion 11 such that the shaft and muffareconnectedfortorquetransmission and relative axial movement. To retain lubricant in, and exclude dirtfrom,the splined connection between the shaft and muff, there is provided a flexible sealing boot 13 of a suitable rubber or other elastic material. The boot comprises a firstannularattachmentportion 14, a second annular attachment portion 15, and a bellows portion 16 therebetween. The portion 14 extends around and forms an airtight seal with the end ofthe muff 12, and has an inwardly extending annular protusion 17 which seats in a corresponding groove extending around the exterior of the muff. The portion 15 has an inwardly extending sealing lip 18 which engages the surface of shaft 10 to provide a seal therewith, at leastwhn.the assembly isstationary. At one point around the periphery of portion 15, the boot has an additional mass 19. This is ofthe same material as the rest ofthe boot, and is incorporated therein during manofacturethereof, usually by a moulding process. tJndercentrifugal force,whenwhen the assembly is rotating akove a certain speed, this additional mass 19 will causethesealing lip 18to lift away from the shaft 10 and establish a vent passage to the interior of the boot. The problems above referred to, of inflation or collapse ofthe boot when the shaft and muff move axially relative to one another, are thus overcome. When the assembly is rotating, escape of lubricant or entry of dirt through the vent passage is not likely to be a problem. Ifthe attachment portions ofthe boot are of different diameters, it is usually preferable that the one adapted to lift underthe centrifugal force is the one of smaller diameter, as any lubricant contained by the boot will tend to occupy the part ofthe boot which is ofgreater diameter, and is thus less likely to escape when the passage to the interior of the boot is established. CLAIMS
1. A flexible sealing boot for a rotary component, including an annular portion adapted by its own resilience to form a seal on a part of the component and having a formation adapted to liftfrom said part under centrifugal force when rotating above a predetermined speed, to provide a vent passage to the interior ofthe boot.
2. A sealing boot according to claim 1 wherein said formation comprises an additional mass provided at one part of said annular portion thereof.
3. Sealing boot substantially as hereinbefore described with reference to the accompanying drawing.
4. A sliding splinedjoint, comprising a shaft and a muff connected fortorque transmission and relative axial movementtherebetween, and having a sealing boot according to any one of the preceding claims.
GB08401678A 1983-02-02 1984-01-23 A sealing boot Expired GB2134994B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08401678A GB2134994B (en) 1983-02-02 1984-01-23 A sealing boot

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838302892A GB8302892D0 (en) 1983-02-02 1983-02-02 Sealing boot
GB08401678A GB2134994B (en) 1983-02-02 1984-01-23 A sealing boot

Publications (3)

Publication Number Publication Date
GB8401678D0 GB8401678D0 (en) 1984-02-22
GB2134994A true GB2134994A (en) 1984-08-22
GB2134994B GB2134994B (en) 1986-04-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08401678A Expired GB2134994B (en) 1983-02-02 1984-01-23 A sealing boot

Country Status (1)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3942701A1 (en) * 1988-12-28 1990-07-05 Ishikawa Tekko Kk PLASTIC CLOSURE, IN PARTICULAR FOR MOTOR VEHICLES AND METHOD FOR THE PRODUCTION THEREOF
US4981304A (en) * 1989-01-06 1991-01-01 Westinghouse Electric Corp. Reactor coolant pump auxiliary flexible vacuum seal for reactor coolant system vacuum degasification
US5077000A (en) * 1989-01-06 1991-12-31 Westinghouse Electric Corp. Method of preparing a reactor coolant pump for vacuum degasification of a reactor coolant system
GB2284398A (en) * 1993-12-06 1995-06-07 Dana Corp Combined seal and boot for a telescopic steering shaft assembly
FR2771148A1 (en) 1997-11-20 1999-05-21 Bosch Syst Freinage Sliding caliper disc brake rod cap
FR2771463A1 (en) 1997-11-24 1999-05-28 Bosch Syst Freinage Protection for small column of vehicle disc brake with floating stirrup
WO2006045362A1 (en) * 2004-10-28 2006-05-04 Gkn Driveline Deutschland Gmbh Seal for joints
DE102008034652A1 (en) * 2008-07-25 2010-02-04 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH On a guide rail of a disc brake arranged bellows
DE102009048326A1 (en) * 2009-10-05 2011-04-07 Bpw Bergische Achsen Kg Disc brake and guide bar of a disc brake

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3942701A1 (en) * 1988-12-28 1990-07-05 Ishikawa Tekko Kk PLASTIC CLOSURE, IN PARTICULAR FOR MOTOR VEHICLES AND METHOD FOR THE PRODUCTION THEREOF
DE3942701C2 (en) * 1988-12-28 1998-02-19 Ishikawa Tekko Kk Process for making a dust seal
US4981304A (en) * 1989-01-06 1991-01-01 Westinghouse Electric Corp. Reactor coolant pump auxiliary flexible vacuum seal for reactor coolant system vacuum degasification
US5077000A (en) * 1989-01-06 1991-12-31 Westinghouse Electric Corp. Method of preparing a reactor coolant pump for vacuum degasification of a reactor coolant system
GB2284398A (en) * 1993-12-06 1995-06-07 Dana Corp Combined seal and boot for a telescopic steering shaft assembly
US5525112A (en) * 1993-12-06 1996-06-11 Dana Corporation Combined seal and boot for steering shaft assembly
GB2284398B (en) * 1993-12-06 1997-07-23 Dana Corp Combined seal and boot for steering shaft assembly
AU682726B2 (en) * 1993-12-06 1997-10-16 Dana Corporation Combined seal and boot for steering shaft assembly
FR2771148A1 (en) 1997-11-20 1999-05-21 Bosch Syst Freinage Sliding caliper disc brake rod cap
FR2771463A1 (en) 1997-11-24 1999-05-28 Bosch Syst Freinage Protection for small column of vehicle disc brake with floating stirrup
WO2006045362A1 (en) * 2004-10-28 2006-05-04 Gkn Driveline Deutschland Gmbh Seal for joints
US8235395B2 (en) 2004-10-28 2012-08-07 Gkn Driveline Deutschland Gmbh Joint seal
DE102008034652A1 (en) * 2008-07-25 2010-02-04 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH On a guide rail of a disc brake arranged bellows
US8925691B2 (en) 2008-07-25 2015-01-06 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Bellows disposed on a guide member of a disc brake
DE102009048326A1 (en) * 2009-10-05 2011-04-07 Bpw Bergische Achsen Kg Disc brake and guide bar of a disc brake
DE102009048326B4 (en) * 2009-10-05 2020-10-15 Bpw Bergische Achsen Kg Disc brake and handlebar of a disc brake

Also Published As

Publication number Publication date
GB2134994B (en) 1986-04-09
GB8401678D0 (en) 1984-02-22

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee