WO2008131464A1 - A seal - Google Patents

A seal Download PDF

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Publication number
WO2008131464A1
WO2008131464A1 PCT/ZA2008/000032 ZA2008000032W WO2008131464A1 WO 2008131464 A1 WO2008131464 A1 WO 2008131464A1 ZA 2008000032 W ZA2008000032 W ZA 2008000032W WO 2008131464 A1 WO2008131464 A1 WO 2008131464A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal
receiving portion
ring
groove
along
Prior art date
Application number
PCT/ZA2008/000032
Other languages
French (fr)
Inventor
Jurie Johannes Stephanus Kruger
Original Assignee
Jurie Johannes Stephanus Kruger
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 Jurie Johannes Stephanus Kruger filed Critical Jurie Johannes Stephanus Kruger
Publication of WO2008131464A1 publication Critical patent/WO2008131464A1/en

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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
    • 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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
    • 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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering
    • F16J15/121—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement
    • 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
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3268—Mounting of sealing rings
    • F16J15/3276—Mounting of sealing rings with additional static sealing between the sealing, or its casing or support, and the surface on which it is mounted

Definitions

  • This invention relates to seals and, more particularly, to a seal that can be used as a static or a dynamic seal in hydraulic and non-hydraulic environments.
  • Seals such as hydraulic seals are used in machinery where static seals are located in grooves, thereby acting like a gasket and where dynamic seals are exposed to movement either on their inner diameter (rod seal) or their outer diameter (piston seal).
  • Hydraulic seals can be exposed to high pressures and are vital in providing a means for converting fluid power into linear motion by blocking or separating fluid in reciprocating motion applications.
  • the invention seeks to provide a seal for use in low and high pressure non- hydraulic and hydraulic applications and which can be used as a static or a dynamic seal.
  • a seal including an axially mountable receiving portion, wherein the receiving portion defines at least one O-ring receiving groove along its outer circumference and at least one O-ring receiving groove along its inner circumference.
  • each groove may be dimensioned to allow a portion of the O-ring to be received therein to stand proud of the groove in a received condition.
  • Each groove is dimensioned to snugly receive an O-ring therein so that the O-ring is retained in the groove even when pressure is exerted thereon.
  • the receiving portion may define two O-ring receiving grooves along its outer circumference and one O-ring receiving groove along its inner circumference.
  • the receiving portion may define three O-ring receiving grooves along its outer circumference and two O-ring receiving grooves along its inner circumference.
  • the receiving portion may define two O-ring receiving grooves along its outer circumference and two O-ring receiving grooves along its inner circumference.
  • O-rings are provided, the more pressure the seal is able to withstand and the more effective it is in acting as a barrier to particulate matter, such as dust.
  • the receiving portion may be in the shape of a flat ring.
  • the inner diameter of the receiving portion is 30.2 mm (measured from the base of the groove) and the outer diameter is 44.6 mm (measured from the base of the groove) with a thickness of 10.1mm.
  • two grooves are defined along the outer and one along the inner circumference of the receiving portion.
  • the receiving portion may be any other shape depending on the shape of the area it is to seal.
  • the shape of the inner and outer circumferences of the receiving portion may be the same or they may be different.
  • the dimensions of the receiving portion are selectable according to the area in which it is to be applied.
  • the receiving portion may be manufactured from a material capable of withstanding pressures and fluids found in systems such as hydraulic system and other systems where the seal may find application e.g., in the vicinity of bearings.
  • the receiving portion may be manufactured from a material selected from the group including: aluminium, polyethylenterephtalat (PET), and suitable synthetic plastics materials.
  • the O-rings receivable in the grooves of the receiving portion may be conventional O-rings and may be round in cross-section.
  • At least one of the O-rings receivable in the groove(s) along the outer circumference of the receiving portion may be square in cross-section.
  • At least one of the O-rings receivable in the groove(s) along the outer circumference of the receiving portion may square in cross-section with a lip extending from an operatively outer circumference of the O-ring.
  • a user is able to select a combination of O-rings most suitable for the particular area in which the seal is to be used.
  • the number of grooves defined along the outer and inner circumferences of the receiving portion may be selected according to the maximum pressure that the seal must be able to withstand in use.
  • three grooves may be defined along the outer circumference and two along the inner circumference of the receiving portion.
  • the seal may be able to withstand a pressure of about 500 bar.
  • a seal according to the invention is believed to find application in any hydraulic system or other mechanical system in which static or dynamic seals are required, for example, in power assisted steering rack-and-pinions, power-assisted steering boxes, shock absorbers, gearboxes, differentials, camshafts and crankshafts (front and rear), and braking system.
  • the seal may be used as a static seal in which case the entire seal is located in a groove configured and dimensioned to snugly receive the seal.
  • the seal may be a hydraulic seal.
  • the seal may be used as a dynamic seal, for example as a rod seal wherein the seal is axially mounted on a rod so that its inner circumference is exposed to movement and/or as a piston seal wherein the seal is received in a tube or bore of a hydraulic cylinder so that its outer circumference is exposed to movement.
  • Advantages of the seal of the present invention include that it can be put into place with little force, thereby minimising damage to the O-rings, that it does not include moving parts that can suffer from material fatigue, that the 0-rings are retained in place by the grooves even when pressure is exerted on them, and that the O-rings can be replaced should they become worn and/or brittle.
  • Figure 1 shows a side view of a first embodiment of a seal in accordance with the present invention excluding O-rings;
  • Figure 2 shows a front view of the seal of Figure 1 ;
  • Figure 3 shows a sectioned side view along line A-A of Figure 2 of the seal of Figure 1 ;
  • Figure 4 shows a side view of the seal of Figure 1 including O-rings
  • Figure 5 shows a side view of a second embodiment of a seal in accordance with the present invention excluding O-rings;
  • Figure 6 shows a sectioned side view of the seal of Figure 5.
  • Figure 7 shows an exploded view of a portion of a power-assisted steering rack indicating the areas in which a seal according to the present invention can be used in practice.
  • reference numeral 10 generally indicates an embodiment of a seal in accordance with the present invention.
  • the seal 10 includes an axially mountable receiving portion 12, wherein the receiving portion 12 defines at least one O-ring receiving groove 14 along its outer circumference and at least one O-ring receiving groove 16 along its inner circumference.
  • the seal 10 is a hydraulic seal.
  • each groove 14, 16 is dimensioned to allow a portion of the O-ring 18 to be received therein to stand proud of the groove 14, 16 in a received condition as shown in Figure 4.
  • Each groove 14, 16 is dimensioned to snugly receive an O-ring 18 therein so that the O-ring 18 is retained in the groove 14,16 even when pressure is exerted thereon.
  • the receiving portion 12 shown in Figures 1 to 4 defines two O-ring receiving grooves 14 along its outer circumference and one O-ring receiving groove 16 along its inner circumference.
  • the receiving portion 12 defines two O-ring receiving grooves 14 along its outer circumference and two O-ring receiving grooves 16 along its inner circumference.
  • the receiving portion 12 is typically in the shape of a flat ring.
  • the inner diameter of the receiving portion is 30.2 mm and the outer diameter is 44.6 mm with a thickness t of 10.1mm.
  • the receiving portion 12 can any other shape depending on the shape of the area it is to seal.
  • the shape of the inner and outer circumferences of the receiving portion 12 can be the same or they can be different.
  • the dimensions of the receiving portion 12 are selectable according to the area in which it is to be applied.
  • the receiving portion 12 is typically manufactured from aluminium or polyethylenterephtalat (PET) as these materials are capable of withstanding pressures and fluids found in hydraulic system.
  • PET polyethylenterephtalat
  • the O-rings 18 receivable in the grooves 14, 16 of the receiving portion 12 can be conventional O-rings that are round in cross-section.
  • At least one of the O-rings 18 receivable in the groove(s) 14 along the outer circumference of the receiving portion 12 can be square in cross-section as shown in Figure 4.
  • a user is able to select a combination of O-rings 18 most suitable for the particular area in which the seal 10 is to be used.
  • the number of grooves 14, 16 defined along the outer and inner circumferences of the receiving portion 12 can be selected according to the maximum pressure that the seal 10 must be able to withstand in use.
  • the seal 10 can be used as a static seal in which case the entire seal is located in a groove configured and dimensioned to snugly receive the seal. (See arrow A in Figure 7.)
  • the seal 10 can also be used as a dynamic seal, for example as a rod seal wherein the seal 10 is axially mounted on a rod so that its inner circumference is exposed to movement and/or as a piston seal wherein the seal 10 is received in a tube or bore of a hydraulic cylinder so that its outer circumference is exposed to movement.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Sealing Devices (AREA)

Abstract

The seal 10 includes an axially mountable receiving portion 12, wherein the receiving portion 12 defines at least one O-ring receiving groove 14 along its outer circumference and at least one O-ring receiving groove 16 along its inner circumference. The depth of each groove 14, 16 is dimensioned to allow a portion of the O-ring 18 to be received therein to stand proud of the groove 14, 16 in a received condition.

Description

A SEAL
Field of the Invention
This invention relates to seals and, more particularly, to a seal that can be used as a static or a dynamic seal in hydraulic and non-hydraulic environments.
Background to the Invention
Seals, such as hydraulic seals are used in machinery where static seals are located in grooves, thereby acting like a gasket and where dynamic seals are exposed to movement either on their inner diameter (rod seal) or their outer diameter (piston seal).
Hydraulic seals can be exposed to high pressures and are vital in providing a means for converting fluid power into linear motion by blocking or separating fluid in reciprocating motion applications.
The invention seeks to provide a seal for use in low and high pressure non- hydraulic and hydraulic applications and which can be used as a static or a dynamic seal.
Summary of the Invention
Thus, according to the invention, there is provided a seal including an axially mountable receiving portion, wherein the receiving portion defines at least one O-ring receiving groove along its outer circumference and at least one O-ring receiving groove along its inner circumference.
The depth of each groove may be dimensioned to allow a portion of the O-ring to be received therein to stand proud of the groove in a received condition. Each groove is dimensioned to snugly receive an O-ring therein so that the O-ring is retained in the groove even when pressure is exerted thereon.
The receiving portion may define two O-ring receiving grooves along its outer circumference and one O-ring receiving groove along its inner circumference.
In an alternative embodiment, the receiving portion may define three O-ring receiving grooves along its outer circumference and two O-ring receiving grooves along its inner circumference.
In yet a further embodiment, the receiving portion may define two O-ring receiving grooves along its outer circumference and two O-ring receiving grooves along its inner circumference.
The more O-rings are provided, the more pressure the seal is able to withstand and the more effective it is in acting as a barrier to particulate matter, such as dust.
The receiving portion may be in the shape of a flat ring. In one embodiment of the invention, the inner diameter of the receiving portion is 30.2 mm (measured from the base of the groove) and the outer diameter is 44.6 mm (measured from the base of the groove) with a thickness of 10.1mm. In this embodiment, two grooves are defined along the outer and one along the inner circumference of the receiving portion.
It is to be appreciated, that the receiving portion may be any other shape depending on the shape of the area it is to seal. The shape of the inner and outer circumferences of the receiving portion may be the same or they may be different. The dimensions of the receiving portion are selectable according to the area in which it is to be applied. The receiving portion may be manufactured from a material capable of withstanding pressures and fluids found in systems such as hydraulic system and other systems where the seal may find application e.g., in the vicinity of bearings.
The receiving portion may be manufactured from a material selected from the group including: aluminium, polyethylenterephtalat (PET), and suitable synthetic plastics materials.
The O-rings receivable in the grooves of the receiving portion may be conventional O-rings and may be round in cross-section.
At least one of the O-rings receivable in the groove(s) along the outer circumference of the receiving portion may be square in cross-section.
At least one of the O-rings receivable in the groove(s) along the outer circumference of the receiving portion may square in cross-section with a lip extending from an operatively outer circumference of the O-ring.
A user is able to select a combination of O-rings most suitable for the particular area in which the seal is to be used.
The number of grooves defined along the outer and inner circumferences of the receiving portion may be selected according to the maximum pressure that the seal must be able to withstand in use.
For a high pressure environment, three grooves may be defined along the outer circumference and two along the inner circumference of the receiving portion. The seal may be able to withstand a pressure of about 500 bar.
For a low pressure environment, two grooves may be defined along the outer circumference and one along the inner circumference of the receiving portion. A seal according to the invention is believed to find application in any hydraulic system or other mechanical system in which static or dynamic seals are required, for example, in power assisted steering rack-and-pinions, power-assisted steering boxes, shock absorbers, gearboxes, differentials, camshafts and crankshafts (front and rear), and braking system.
The seal may be used as a static seal in which case the entire seal is located in a groove configured and dimensioned to snugly receive the seal.
The seal may be a hydraulic seal.
The seal may be used as a dynamic seal, for example as a rod seal wherein the seal is axially mounted on a rod so that its inner circumference is exposed to movement and/or as a piston seal wherein the seal is received in a tube or bore of a hydraulic cylinder so that its outer circumference is exposed to movement.
Advantages of the seal of the present invention include that it can be put into place with little force, thereby minimising damage to the O-rings, that it does not include moving parts that can suffer from material fatigue, that the 0-rings are retained in place by the grooves even when pressure is exerted on them, and that the O-rings can be replaced should they become worn and/or brittle.
Detailed Description of the Invention
The invention will now be described by way of the following non-limiting examples with reference to the accompanying drawings.
In the drawings:-
Figure 1 shows a side view of a first embodiment of a seal in accordance with the present invention excluding O-rings; Figure 2 shows a front view of the seal of Figure 1 ;
Figure 3 shows a sectioned side view along line A-A of Figure 2 of the seal of Figure 1 ;
Figure 4 shows a side view of the seal of Figure 1 including O-rings;
Figure 5 shows a side view of a second embodiment of a seal in accordance with the present invention excluding O-rings;
Figure 6 shows a sectioned side view of the seal of Figure 5; and
Figure 7 shows an exploded view of a portion of a power-assisted steering rack indicating the areas in which a seal according to the present invention can be used in practice.
In the drawings, reference numeral 10 generally indicates an embodiment of a seal in accordance with the present invention.
The seal 10 includes an axially mountable receiving portion 12, wherein the receiving portion 12 defines at least one O-ring receiving groove 14 along its outer circumference and at least one O-ring receiving groove 16 along its inner circumference. In the embodiment show, the seal 10 is a hydraulic seal.
The depth of each groove 14, 16 is dimensioned to allow a portion of the O-ring 18 to be received therein to stand proud of the groove 14, 16 in a received condition as shown in Figure 4.
Each groove 14, 16 is dimensioned to snugly receive an O-ring 18 therein so that the O-ring 18 is retained in the groove 14,16 even when pressure is exerted thereon. The receiving portion 12 shown in Figures 1 to 4 defines two O-ring receiving grooves 14 along its outer circumference and one O-ring receiving groove 16 along its inner circumference.
In the embodiment shown in Figures 5 and 6 the receiving portion 12 defines two O-ring receiving grooves 14 along its outer circumference and two O-ring receiving grooves 16 along its inner circumference.
The receiving portion 12 is typically in the shape of a flat ring. For the embodiment shown in Figures 1 to 4, the inner diameter of the receiving portion is 30.2 mm and the outer diameter is 44.6 mm with a thickness t of 10.1mm.
It is to be appreciated, that the receiving portion 12 can any other shape depending on the shape of the area it is to seal. The shape of the inner and outer circumferences of the receiving portion 12 can be the same or they can be different. The dimensions of the receiving portion 12 are selectable according to the area in which it is to be applied.
The receiving portion 12 is typically manufactured from aluminium or polyethylenterephtalat (PET) as these materials are capable of withstanding pressures and fluids found in hydraulic system.
The O-rings 18 receivable in the grooves 14, 16 of the receiving portion 12 can be conventional O-rings that are round in cross-section.
At least one of the O-rings 18 receivable in the groove(s) 14 along the outer circumference of the receiving portion 12 can be square in cross-section as shown in Figure 4.
A user is able to select a combination of O-rings 18 most suitable for the particular area in which the seal 10 is to be used. The number of grooves 14, 16 defined along the outer and inner circumferences of the receiving portion 12 can be selected according to the maximum pressure that the seal 10 must be able to withstand in use.
The seal 10 can be used as a static seal in which case the entire seal is located in a groove configured and dimensioned to snugly receive the seal. (See arrow A in Figure 7.)
The seal 10 can also be used as a dynamic seal, for example as a rod seal wherein the seal 10 is axially mounted on a rod so that its inner circumference is exposed to movement and/or as a piston seal wherein the seal 10 is received in a tube or bore of a hydraulic cylinder so that its outer circumference is exposed to movement.
It is to be appreciated, that the invention is not limited to any particular embodiment or configuration as hereinbefore generally described or illustrated.

Claims

Claims
1. A seal including an axially mountable receiving portion, wherein the receiving portion defines at least one O-ring receiving groove along its outer circumference and at least one O-ring receiving groove along its inner circumference.
2. A seal as claimed in claim 1 , wherein the depth of each groove is dimensioned to allow a portion of the O-ring to be received therein to stand proud of the groove in a received condition.
3. A seal as claimed in claim 1 or claim 2, wherein the receiving portion defines two O-ring receiving grooves along its outer circumference.
4. A seal as claimed in claim 3, wherein the receiving portion defines one O- ring receiving groove along its inner circumference.
5. A seal as claimed in claim 1 or claim 2, wherein the receiving portion defines three O-ring receiving grooves along its outer circumference.
6. A seal as claimed in claim 5, wherein the receiving portion defines two O- ring receiving grooves along its inner circumference.
7. A seal as claimed in any one of the preceding claims, wherein the receiving portion is in the shape of a flat ring.
8. A seal as claimed in any one of the preceding claims, wherein the receiving portion is manufactured from a material capable of withstanding pressures and fluids found in hydraulic system.
9. A seal as claimed in claim 8, wherein the receiving portion is manufactured from a material selected from the group including: aluminium, polyethylenterephtalat (PET), and suitable synthetic plastics materials.
10. A seal as claimed in any one of the preceding claims, wherein the O-rings receivable in the grooves of the receiving portion are round in cross- section.
11. A seal as claimed in any one of claims 1 to 9, wherein at least one of the O-rings receivable in the groove(s) along the outer circumference of the receiving portion is square in cross-section.
12. A seal as claimed in any one of claims 1 to 9, wherein at least one of the O-rings receivable in the groove(s) along the outer circumference of the receiving portion is square in cross-section with a lip extending from an operatively outer circumference of the O-ring.
13. A seal as claimed in any one of the preceding claims, wherein the seal is a hydraulic seal.
14. A seal according to the invention as hereinbefore generally described.
15. A seal according to the invention substantially as hereinbefore described or exemplified.
16. A seal as specifically described with reference to or as illustrated in any one of the accompanying drawings.
17. A seal including any new and inventive integer or combination of integers substantially as herein described.
PCT/ZA2008/000032 2007-04-18 2008-04-18 A seal WO2008131464A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200608684 2007-04-18
ZA2006/08684 2007-04-18

Publications (1)

Publication Number Publication Date
WO2008131464A1 true WO2008131464A1 (en) 2008-10-30

Family

ID=39747113

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2008/000032 WO2008131464A1 (en) 2007-04-18 2008-04-18 A seal

Country Status (2)

Country Link
WO (1) WO2008131464A1 (en)
ZA (1) ZA200908199B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103056617A (en) * 2012-12-28 2013-04-24 宁波新宏液压有限公司 Method for manufacturing and assembling hydraulic pressure motor oil-sealing ring

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331609A (en) * 1965-04-07 1967-07-18 Edwin W Plumb Rotary fluid seal
GB2023256A (en) * 1978-06-19 1979-12-28 Double E Co Expanding mandrels
US4406463A (en) * 1980-07-16 1983-09-27 Herbert Hanchen Kg Low-friction seal
US20030047879A1 (en) * 2001-09-10 2003-03-13 Bowen Willard L. Rotary sealing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331609A (en) * 1965-04-07 1967-07-18 Edwin W Plumb Rotary fluid seal
GB2023256A (en) * 1978-06-19 1979-12-28 Double E Co Expanding mandrels
US4406463A (en) * 1980-07-16 1983-09-27 Herbert Hanchen Kg Low-friction seal
US20030047879A1 (en) * 2001-09-10 2003-03-13 Bowen Willard L. Rotary sealing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103056617A (en) * 2012-12-28 2013-04-24 宁波新宏液压有限公司 Method for manufacturing and assembling hydraulic pressure motor oil-sealing ring

Also Published As

Publication number Publication date
ZA200908199B (en) 2010-07-28

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