GB2078336A - U-type ring, or cup, seal - Google Patents
U-type ring, or cup, seal Download PDFInfo
- 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
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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Braking Arrangements (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
- Sealing Devices (AREA)
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)
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.
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)
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)
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)
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 |
-
1980
- 1980-06-18 DE DE3022627A patent/DE3022627C2/en not_active Expired
-
1981
- 1981-05-25 FR FR8110327A patent/FR2485145B1/en not_active Expired
- 1981-05-29 GB GB8116553A patent/GB2078336B/en not_active Expired
Cited By (3)
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 |
---|---|
DE3022627A1 (en) | 1981-12-24 |
FR2485145B1 (en) | 1987-09-25 |
DE3022627C2 (en) | 1982-09-09 |
FR2485145A1 (en) | 1981-12-24 |
GB2078336B (en) | 1985-01-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4164893A (en) | Sealing device at pressure fluid cylinders | |
US3943717A (en) | Contaminant removal from a hydraulic cylinder | |
US4821627A (en) | Piston and cylinder assembly | |
FR2394716A1 (en) | SHOCK ABSORBER | |
KR920701725A (en) | Cold worked pistons for hydraulically actuated brakes | |
GB2078336A (en) | U-type ring, or cup, seal | |
US4303250A (en) | Sealing in an adapter for available sealing grooves | |
US3141303A (en) | Master cylinders for hydraulic transmission systems | |
ES2125640T3 (en) | ASSISTED BRAKING DEVICE WITH PROTECTED DISPLACEMENT AND IMPROVED SAFETY. | |
US4998459A (en) | Rodless fluid actuated motor with improved sealing characteristics | |
CN1129726C (en) | Sealing device of rodless action cylinder | |
AU1786888A (en) | Cylinder-piston combination actuated by a pressure medium | |
ITBO940311A1 (en) | QUICK SEAL CONNECTION FOR SAFETY VALVES FOR TIRES | |
GB1123598A (en) | Improvements in or relating to vehicle suspension units | |
KR850007767A (en) | Lock power steering | |
KR940002105Y1 (en) | Boots | |
US5022499A (en) | Axially slit pressure cylinder with brake means | |
KR100963535B1 (en) | Apparatus for preventing piston from abrasion in hydraulic cylinder | |
CN215567555U (en) | Hydraulic brake device and bicycle | |
KR100393116B1 (en) | Dust rip protecting apparatus of oil pressure cylinder for steering gear | |
CN214274322U (en) | Industrial oil pressure buffer | |
JPH0560986U (en) | Hydraulic cylinder | |
RU1809216C (en) | Hydraulic cylinder | |
KR830005496A (en) | Pump safety device | |
KR920000379Y1 (en) | Brake booster |
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 |