GB2078336A - U-type ring, or cup, seal - Google Patents

U-type ring, or cup, seal Download PDF

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Publication number
GB2078336A
GB2078336A GB8116553A GB8116553A GB2078336A GB 2078336 A GB2078336 A GB 2078336A GB 8116553 A GB8116553 A GB 8116553A GB 8116553 A GB8116553 A GB 8116553A GB 2078336 A GB2078336 A GB 2078336A
Authority
GB
United Kingdom
Prior art keywords
seal
sealing lip
lip
sealing
cup
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
GB8116553A
Other versions
GB2078336B (en
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.)
IHO Holding GmbH and Co KG
Original Assignee
FAG Kugelfischer Georg Schaefer KGaA
Kugelfischer Georg Schaefer and Co
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6104793&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB2078336(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by FAG Kugelfischer Georg Schaefer KGaA, Kugelfischer Georg Schaefer and Co filed Critical FAG Kugelfischer Georg Schaefer KGaA
Publication of GB2078336A publication Critical patent/GB2078336A/en
Application granted granted Critical
Publication of GB2078336B publication Critical patent/GB2078336B/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
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/236—Piston sealing arrangements
    • 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
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one 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
    • 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
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings

Abstract

A U-type ring, or cup, seal (4) for the fluid-tight separation of pressure spaces, for example in a wheel cylinder of a motor vehicle's hydraulic brake system comprises a main body (7) - fastenable, for example, to a piston reciprocating in the cylinder - and a sealing lip (8) tapering outwardly from the main body. In order to prevent the sealing edge, once the seal has been operationally mounted, from being compressed and thus abutting with too broad an area on the surface to be sealed, a further protrusion (10) is arranged at the end of the lip (8), which further protrusion (10) tilts in use so that its sealing edge (13) abuts only line-like on the surface to be sealed, thus ensuring smoother operation of the system in which the seal is mounted. <IMAGE>

Description

SPECIFICATION A U-type ring, or cup, seal for the fluid-tight separation of pressure spaces This invention relates to a U-type ring, or cup, seal, for the fluid-tight separation of pressure spaces, for example in a hydraulic brake system for a motor vehicle, the seal comprising a main body and a sealing lip for abutting on the surface to be sealed.
A sealing device of this kind is known from German Petty Patent No. 79 00 776. A disadvantage of this known device is that its high initial break away moment - which is due to the adsorption of the sealing lip to the surface to be sealed - requires high displacement forces for the cylinders or pistons, respectively, with the result that jerk-free operation cannot be ensured - the reason being that due to the high pressure in the cylinder, a face band of the sealing lip, (instead of only a face line), is caused to abut on the surface to be sealed. Moreover, in the event of vibrations occuring in the system a device of this design renders ingress of air into the cylinder bores easily possible.
It is an aim of the invention, therefore, to improve a U-type ring, or cup, seal, of the kind referred to in the opening paragraph to such an extent that the axial displacement forces for the cylinders or pis tons, respectively, can be decreased, that is to say that the initial break-away moment may be reduced and the possibility of ingress of air lessened.
Accordingly, the invention provides a U-type ring, or cup, seal for the fluid-tight separation of pressure spaces, for example in a hydraulic brake system for a motor vehicle, the seal comprising a main body and a sealing lip for abutting on the surface to be sealed, said sealing lip tapering outwardly from the main body and having at its outer end a sealing edge adjacent to which a further sealing lip is arranged.
The provision of a further sealing lip (nose lip) on the known lip results in a controlled line-like contact of the sealing lip with the counter surface, i.e. the surface to be sealed. Further, the resilience of the entire lip is increased so that vibrations occurring in the system can more easily be absorbed and, as a result, the possibility of ingress of air lessened. Thus, due to the lowered initial break-away moment resulting from the line-like abutment, in contrast to the band-like one, jerk-free operation is ensured.
The invention will now be explained in more detail with reference to one embodiment illustrated in the accompanying drawings, in which: Figure 1 is a front view, partly in cross-section, of a wheel cylinder of a motor vehicle's hydraulic brake system including a U-type ring, or cup, seal accord b ing to the invention mounted therein; Figure 2 is a partial cross-sectional view of the seal only in its unmounted state; Figure 3 is a partial cross-sectional view on an enlarged scale of the cylinder and the seal mounted therein.
Awheel cylinder casing of a hydraulic brake system of a motor vehicle in Figure 1 is denoted by the reference numeral 1. Two pistons 2 which displace respective plungers 3 in opposite directions are arranged in the bore of the wheel cylinder casing. A U-type ring, or cup, seal 4 is secured to each piston 2, which seal serves to separate in fluid-tight fashion pressure spaces in the cylinder and which abuts by its sealing lip - generally denoted by the reference numeral 5-on the wall 6 of the cylinder bore, the wall 6 being the wall to be sealed and surrounding the pressure spaces to be separated.
As will be seen more clearly from Figure 2, a sealing lip 8 tapers outwardly from the main body 7 of the seal 4. The lip 8 has at its outer end, that is at its free end remote from the main body, a sealing edge 9. According to the invention, a further sealing lip 10 is arranged adjacent to the sealing edge 9 of the lip 8. This further sealing lip 10 includes a face 11 remote from the lip 8 and its edge 9. The face 11, in the seal's unmounted state, extends parallel with the seal's longitudinal axis and is, in the embodiment illustrated, tiltable together with a portion of the lip 8 closest to it about a fulcrum 12 located in the lip 8.
However, it is also feasible to construct a seal according to the invention in such a way that the sealing lip 10 may be tilted on its own.
The sealing lip 8 abuts in both instances, once the seal 4 has been mounted, only by one edge 13 of the face 11 on the counter surface of the wall 6.
Figure 3 illustrates the seal 4 in its mounted state.
Its original shape (unmounted) is indicated by dash-dotted lines. It can clearly be seen that the further sealing lip 10 abuts only by the one edge 13 of its face 11 on the counter surface constituted by the wall 6 whereas the sealing lip 8 does not touch the counter surface.
The construction of the sealing lip 10 in such a way that its face 11 extends, in the seal's unmounted state, parallel with the axis thereof is advantageous from the manufacturing point of view since an exact sealing edge - in contrast to the known sealing band - may thus be manufactured by means of ordinary tools. However, other shapes of the sealing lip may also be used. It is also to be understood that although a seal according to the invention has been described with reference to a wheel cylinder of a hydraulic brake system of a motor vehicle, its application is not restricted to such a system.
1. A U-type ring, or cup, seal for the fluid-tight separation of pressure spaces, for example in a hydraulic brake system for a motor vehicle, the seal comprising a main body and a sealing lip for abutting on the surface to be sealed, said sealing lip tapering outwardly from the main body and having at its outer end a sealing edge adjacent to which a further sealing lip is arranged.
2. A seal according to claim 1, wherein the further sealing lip includes a face remote from the one sealing lip and its sealing edge which face is, in the seal's unmounted state, parallel with the longitu dinal axis thereof.
3. A seal according to claim 2, wherein at least the further sealing lip is tiltable about a fulcrcum, and wherein, when the seal is operationally
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A U-type ring, or cup, seal for the fluid-tight separation of pressure spaces This invention relates to a U-type ring, or cup, seal, for the fluid-tight separation of pressure spaces, for example in a hydraulic brake system for a motor vehicle, the seal comprising a main body and a sealing lip for abutting on the surface to be sealed. A sealing device of this kind is known from German Petty Patent No. 79 00 776. A disadvantage of this known device is that its high initial break away moment - which is due to the adsorption of the sealing lip to the surface to be sealed - requires high displacement forces for the cylinders or pistons, respectively, with the result that jerk-free operation cannot be ensured - the reason being that due to the high pressure in the cylinder, a face band of the sealing lip, (instead of only a face line), is caused to abut on the surface to be sealed. Moreover, in the event of vibrations occuring in the system a device of this design renders ingress of air into the cylinder bores easily possible. It is an aim of the invention, therefore, to improve a U-type ring, or cup, seal, of the kind referred to in the opening paragraph to such an extent that the axial displacement forces for the cylinders or pis tons, respectively, can be decreased, that is to say that the initial break-away moment may be reduced and the possibility of ingress of air lessened. Accordingly, the invention provides a U-type ring, or cup, seal for the fluid-tight separation of pressure spaces, for example in a hydraulic brake system for a motor vehicle, the seal comprising a main body and a sealing lip for abutting on the surface to be sealed, said sealing lip tapering outwardly from the main body and having at its outer end a sealing edge adjacent to which a further sealing lip is arranged. The provision of a further sealing lip (nose lip) on the known lip results in a controlled line-like contact of the sealing lip with the counter surface, i.e. the surface to be sealed. Further, the resilience of the entire lip is increased so that vibrations occurring in the system can more easily be absorbed and, as a result, the possibility of ingress of air lessened. Thus, due to the lowered initial break-away moment resulting from the line-like abutment, in contrast to the band-like one, jerk-free operation is ensured. The invention will now be explained in more detail with reference to one embodiment illustrated in the accompanying drawings, in which: Figure 1 is a front view, partly in cross-section, of a wheel cylinder of a motor vehicle's hydraulic brake system including a U-type ring, or cup, seal accord b ing to the invention mounted therein; Figure 2 is a partial cross-sectional view of the seal only in its unmounted state; Figure 3 is a partial cross-sectional view on an enlarged scale of the cylinder and the seal mounted therein. Awheel cylinder casing of a hydraulic brake system of a motor vehicle in Figure 1 is denoted by the reference numeral 1. Two pistons 2 which displace respective plungers 3 in opposite directions are arranged in the bore of the wheel cylinder casing. A U-type ring, or cup, seal 4 is secured to each piston 2, which seal serves to separate in fluid-tight fashion pressure spaces in the cylinder and which abuts by its sealing lip - generally denoted by the reference numeral 5-on the wall 6 of the cylinder bore, the wall 6 being the wall to be sealed and surrounding the pressure spaces to be separated. As will be seen more clearly from Figure 2, a sealing lip 8 tapers outwardly from the main body 7 of the seal 4. The lip 8 has at its outer end, that is at its free end remote from the main body, a sealing edge 9. According to the invention, a further sealing lip 10 is arranged adjacent to the sealing edge 9 of the lip 8. This further sealing lip 10 includes a face 11 remote from the lip 8 and its edge 9. The face 11, in the seal's unmounted state, extends parallel with the seal's longitudinal axis and is, in the embodiment illustrated, tiltable together with a portion of the lip 8 closest to it about a fulcrum 12 located in the lip 8. However, it is also feasible to construct a seal according to the invention in such a way that the sealing lip 10 may be tilted on its own. The sealing lip 8 abuts in both instances, once the seal 4 has been mounted, only by one edge 13 of the face 11 on the counter surface of the wall 6. Figure 3 illustrates the seal 4 in its mounted state. Its original shape (unmounted) is indicated by dash-dotted lines. It can clearly be seen that the further sealing lip 10 abuts only by the one edge 13 of its face 11 on the counter surface constituted by the wall 6 whereas the sealing lip 8 does not touch the counter surface. The construction of the sealing lip 10 in such a way that its face 11 extends, in the seal's unmounted state, parallel with the axis thereof is advantageous from the manufacturing point of view since an exact sealing edge - in contrast to the known sealing band - may thus be manufactured by means of ordinary tools. However, other shapes of the sealing lip may also be used. It is also to be understood that although a seal according to the invention has been described with reference to a wheel cylinder of a hydraulic brake system of a motor vehicle, its application is not restricted to such a system. CLAIMS
1. A U-type ring, or cup, seal for the fluid-tight separation of pressure spaces, for example in a hydraulic brake system for a motor vehicle, the seal comprising a main body and a sealing lip for abutting on the surface to be sealed, said sealing lip tapering outwardly from the main body and having at its outer end a sealing edge adjacent to which a further sealing lip is arranged.
2. A seal according to claim 1, wherein the further sealing lip includes a face remote from the one sealing lip and its sealing edge which face is, in the seal's unmounted state, parallel with the longitu dinal axis thereof.
3. A seal according to claim 2, wherein at least the further sealing lip is tiltable about a fulcrcum, and wherein, when the seal is operationally mounted, one edge of the face of the further lip abuts on the surface to be sealed.
4. A seal according to claim 3, wherein the further sealing lip together with a portion of the one lip closest to it are tiltable, and wherein the fulcrum is located in the one lip.
5. A U-type ring, or cup, seal for the fluid-tight separation of pressure spaces, constructed, arranged and adapted to operate substantially as herein described with reference to the accompany ing illustrative drawings.
GB8116553A 1980-06-18 1981-05-29 U-type ring or cup seal Expired GB2078336B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3022627A DE3022627C2 (en) 1980-06-18 1980-06-18 U-ring or sealing collar

Publications (2)

Publication Number Publication Date
GB2078336A true GB2078336A (en) 1982-01-06
GB2078336B GB2078336B (en) 1985-01-30

Family

ID=6104793

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8116553A Expired GB2078336B (en) 1980-06-18 1981-05-29 U-type ring or cup seal

Country Status (3)

Country Link
DE (1) DE3022627C2 (en)
FR (1) FR2485145B1 (en)
GB (1) GB2078336B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4582366A (en) * 1984-11-02 1986-04-15 Burfield Peter C Lubricant seal for track linkage
EP0438285A2 (en) * 1990-01-19 1991-07-24 Butterworth Jetting Systems, Inc. Valve assembly for high pressure water shut-off gun

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4415731C2 (en) * 1994-05-04 2001-08-02 Continental Ag Sealing arrangement, especially in a dual-circuit brake cylinder
DE19505012A1 (en) * 1995-02-15 1996-08-22 Teves Gmbh Alfred Sealing sleeve for hydraulic systems

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB473449A (en) * 1935-11-05 1937-10-13 Mercier Jean Improvements in tight scraping packing devices for pistons, stuffing-boxes and the like
GB724341A (en) * 1952-07-31 1955-02-16 Garlock Packing Co Sealing device between relatively rotatable elements and method of making the same
US2815995A (en) * 1954-06-28 1957-12-10 Acushnet Process Company Lip type seal for sealing hydraulic and pneumatic pressure systems
AT193207B (en) * 1955-08-25 1957-11-25 Stabeg Appbau Gmbh Sealing body for piston pressurized with pressure medium
GB837814A (en) * 1955-09-24 1960-06-15 Renault Improvements in or relating to a fluid-tight packing of flexible material
US3072450A (en) * 1959-01-12 1963-01-08 Goshen Rubber Co Inc Hydraulic piston cup
FR1363879A (en) * 1962-05-11 1964-06-19 Bendix Corp Sealing cup
GB1072442A (en) * 1966-01-28 1967-06-14 Unisearch Ltd Improved piston-ring unit
GB1142265A (en) * 1967-02-14 1969-02-05 Trist Mouldings & Seals Ltd Improvements relating to sealing rings
US4166628A (en) * 1974-05-30 1979-09-04 Garlock Inc. Grease purgeable bushing seal
US4061346A (en) * 1977-01-24 1977-12-06 General Motors Corporation Cup seal for use in a master cylinder
JPS5854307B2 (en) * 1977-07-15 1983-12-03 アイシン精機株式会社 piston cup
DE7900776U1 (en) * 1978-01-13 1979-07-05 D.B.A. Bendix Lockheed Air Equipement S.A., Clichy, Hauts-De-Seine (Frankreich) Sealing device
ZA793885B (en) * 1978-08-16 1980-07-30 Lucas Industries Ltd Piston and cylinder seal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4582366A (en) * 1984-11-02 1986-04-15 Burfield Peter C Lubricant seal for track linkage
EP0438285A2 (en) * 1990-01-19 1991-07-24 Butterworth Jetting Systems, Inc. Valve assembly for high pressure water shut-off gun
EP0438285A3 (en) * 1990-01-19 1991-12-27 Butterworth Jetting Systems, Inc. Valve assembly for high pressure water shut-off gun

Also Published As

Publication number Publication date
GB2078336B (en) 1985-01-30
FR2485145A1 (en) 1981-12-24
FR2485145B1 (en) 1987-09-25
DE3022627A1 (en) 1981-12-24
DE3022627C2 (en) 1982-09-09

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19970529