DE19814145A1 - Elastic sealing ring in annular groove - Google Patents

Elastic sealing ring in annular groove

Info

Publication number
DE19814145A1
DE19814145A1 DE19814145A DE19814145A DE19814145A1 DE 19814145 A1 DE19814145 A1 DE 19814145A1 DE 19814145 A DE19814145 A DE 19814145A DE 19814145 A DE19814145 A DE 19814145A DE 19814145 A1 DE19814145 A1 DE 19814145A1
Authority
DE
Germany
Prior art keywords
sealing ring
annular
peripheral
cylinder
groove
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.)
Ceased
Application number
DE19814145A
Other languages
German (de)
Inventor
Yasuhito Sekihara
Tadao Saito
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.)
Aisin Seiki Co Ltd
Original Assignee
Aisin Seiki 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 to JP9081247A priority Critical patent/JPH10274335A/en
Application filed by Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
Publication of DE19814145A1 publication Critical patent/DE19814145A1/en
Ceased legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/32Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/56Other sealings for reciprocating rods

Abstract

The annular groove (21) containing the sealing ring is positioned on the outer peripheral surface of a hydraulic piston (20) moving in a cylinder (30) of the hydraulic appliance. The sealing ring seals a gap between an outer peripheral surface of the hydraulic piston and an inner peripheral surface of the cylinder. Two inner annular protuberances (11,12) are axially spaced apart on an inner periphery of the sealing ring (10) and are in elastic contact with a base surface (21a) of the groove. Two outer annular protuberances (13,14) are axially spaced apart on the outer periphery of the sealing ring and are in elastic contact with the inner peripheral surface of the cylinder.

Description

The invention relates to a sealing ring and in particular on a sealing ring made of an elastic material, such as for example rubber, which is made into an annular Groove is set on an outer peripheral surface of a Piston is formed, and one in a cylinder hydraulic device, such as one Hydraulic piston pump, is movable to seal a gap, that between the outer peripheral surface of the piston and one inner peripheral surface of the cylinder is formed.

A conventional, made of rubber sealing ring 1 A shown in Fig. 8, is arranged together with a support ring 4 in an annular groove 2a formed on an outer peripheral surface of a piston 2 movable in a cylinder 3 to seal a gap formed between an outer peripheral surface of the piston 2 and an inner peripheral surface of the cylinder 3 . The sealing ring 1 A has an inner peripheral surface which is shaped in the shape of a straight cylinder, the sealing ring 1 A in the groove 2 a being widened by the bottom surface of the groove 2 a in order to distribute the contact pressure between the inner peripheral surface of the sealing ring 1 A and to produce a bottom surface of the groove 2 a. The sealing ring 1 A is provided on its outer circumference with a single annular projection 1 a, which lies in a center in an axial direction of the sealing ring 1 A, and it is provided with a cross section in a trapezoidal shape, which is why a composition of the sealing ring 1 a is symmetrical to a radial line passing through an axial center of the seal ring 1A. The sealing ring 1 A in the groove 2 a of the piston 2 in the cylinder 3 is compressed in a radial direction by the piston 2 and the cylinder 3 to a contact pressure distribution between the annular projection 1 a of the sealing ring 1 A and the inner circumference of the cylinder 3 to generate.

The sealing ring 1 A shown in Fig. 8 has an advantage that there is no error in arranging the sealing ring 1 A in the groove 2 a, because the configuration of the sealing ring 1 A with respect to the through the axial center of the sealing ring 1 A extending radial direction is symmetrical. However, the sealing ring 1 A has a disadvantage that it is difficult to increase the contact pressure between the inner periphery of the sealing ring 1 A and the bottom surface of the groove 2 a to a value which is sufficient to prevent a flow of a strongly below Block hydraulic pressure over the inner circumference of the sealing ring 1 A without increasing the difficulty in arranging the sealing ring 1 A in the groove 2 a, because an increase in the contact pressure increases a force that is required to the sealing ring 1 A widen when inserting the sealing ring 1 A in the groove 2 a. The sealing ring 1 A has another disadvantage that it is difficult to increase the contact pressure between the annular projection 1 a of the sealing ring 1 A and the inner circumferential surface of the cylinder 3 to a value sufficient to flow the to block strong pressurized hydraulic fluid over the outer circumference of the sealing ring 1 a, without a frictional resistance against the movement of a raise of the piston 2, as a sealing angle of the high-pressure side (right side in Fig. 8) of the annular projection 1 a to a relatively narrow sealing angle is limited in order to keep the frictional resistance at a relatively low value.

Another conventional, made of rubber sealing ring 1 B shown in Fig. 9 is arranged together with a support ring 4 in an annular groove 2a, which is formed on an outer peripheral surface of a piston 2, movably in a cylinder 3 is to seal a gap formed between the outer peripheral surface of the piston 2 and an inner peripheral surface of the cylinder 3 . The sealing ring 1 B has an inner peripheral surface which is shaped in the shape of a straight cylinder, the sealing ring 1 B in the groove 2 a being widened by the bottom surface of the groove 2 a in order to distribute the contact pressure between the inner peripheral surface of the sealing ring 1 B and to produce a bottom surface of the groove 2 a. The sealing ring 1 B is provided on its outer circumference with a single annular projection 1 b, which is at a position offset in an axial direction of the sealing ring 1 B relative to a center of the sealing ring 1 B to a high-pressure side (right side in FIG. 9) . The annular projection 1 b is provided with a relatively large sealing angle on its high pressure side and with a relatively small sealing angle on its low pressure side, so that a configuration of the sealing ring 1 B is not symmetrical with respect to a radial line running through an axial center of the sealing ring 1 B. The sealing ring 1 B in the groove 2 a of the piston 2 in the cylinder 3 is compressed in a radial direction by the piston 2 and the cylinder 3 to a local contact pressure distribution between the annular projection 1 b of the sealing ring 1 B and the inner circumference of the To produce cylinder 3 .

The conventional sealing ring 1 B shown in Fig. 9 is sufficient to block a flow of highly pressurized hydraulic fluid over the outer periphery of the sealing ring 1 B, because the local contact pressure distribution between the annular projection 1 b of the sealing ring 1 B and inner peripheral surface of the cylinder 3 is generated. However, the sealing ring 1 B has a disadvantage that it is difficult to increase the contact pressure between the inner periphery of the sealing ring 1 B and the bottom surface of the groove 2 a to a value sufficient to accommodate the flow of the strongly Block pressurized hydraulic fluid over the inner circumference of the sealing ring 1 B. The sealing ring 1 B has a further disadvantage that the sealing ring 1 B fails to block the flow of the pressurized hydraulic fluid when the sealing ring 1 B is reversed in the groove 2 a.

Accordingly, it is an object of the invention to provide a sealing ring to create that solves the disadvantages mentioned above and thus provides excellent sealing properties.

To achieve the above-mentioned object is according to the invention a sealing ring is provided, which is made of an elastic material is produced and arranged in an annular groove, on an outer peripheral surface of a hydraulic piston is formed, the one in a cylinder Hydraulic device is movable to seal a gap, between the outer peripheral surface of the hydraulic piston and an inner peripheral surface of the cylinder is defined. He includes a pair of first and second inner annular ones Projections on an inner circumference of the sealing ring are provided. The first and second inner annular ones Projections are in an axial direction of each other Sealing rings spaced. The first and second inner annular projections are in elastic contact with one Bottom surface of the groove to a pair of local Contact pressure distributions between the first and second inner annular projection of the sealing ring and the bottom surface of the to produce an annular groove. The sealing ring also includes a Pair of first and second outer annular projections attached to an outer periphery of the sealing ring are provided and in the are axially spaced from each other. The first and second outer annular projections are elastic Contact the inner peripheral surface of the cylinder to make a pair local contact pressure distributions between the first and second outer annular projection of the sealing ring and the to produce the inner peripheral surface of the cylinder. Everyone who first and second outer annular projections has one first sealing angle on one side and a second Sealing angle on its other side, larger than the first Sealing angle is. The sealing ring has a configuration that with respect to an axial center of the sealing ring radial line is symmetrical.

The above task as well as other features and advantages of Invention will be preferred from the following description Embodiments with reference to the accompanying Drawings obvious.

Fig. 1 is a sectional view of a hydraulic piston pump with an inventive embodiment of a sealing ring;

Fig. 2 is an enlarged sectional view of part of Fig. 1;

Fig. 3 is a sectional view of the embodiment in a free state;

Fig. 4 is a sectional view showing the embodiment in use;

Fig. 5 is an enlarged sectional view of part of a sectional view of the hydraulic piston pump with another embodiment of the invention the sealing ring;

Fig. 6 is a sectional view of the second embodiment in a free state;

Fig. 7 is a sectional view showing a modified annular groove for receiving the seal ring shown in Figs. 1 to 4;

Fig. 8 is a sectional view showing a conventional sealing ring; and

Fig. 9 is a sectional view showing another conventional sealing ring.

Preferred embodiments of the invention are as follows described with reference to the accompanying drawings.

Referring now to FIG. 1, there is shown a brake pressure control unit for an anti-lock brake system that includes a hydraulic pump P driven by an electric motor M. The hydraulic pump F includes a pair of pistons 20 , 20 which are movably received in a cylinder 30 . As shown in FIGS. 1 and 2, each of the pistons 20 , 20 is provided with a sealing ring 10 according to the invention to seal a gap formed between an outer peripheral surface of each piston 20 and an inner peripheral surface 31 of the cylinder 30 . The seal ring 10 is made of an elastic material such as rubber and is arranged in an annular groove 21 formed on an outer peripheral surface of each piston 20 together with an annular support ring 40 . The arranged in the annular groove 21 sealing ring 10 is expanded by the bottom surface 21 a of the groove 21 and compressed in a radial direction by the piston 20 and the cylinder 30 . The sealing ring 10 is not compressed in an axial direction.

2-4 , the seal ring 10 has a pair of first and second inner annular protrusions 11 and 12 on its inner periphery and a pair of outer annular protrusions 13 and 14 on its outer periphery. The inner annular projections 11 and 12 are spaced from each other in an axial direction of the sealing ring 10 and in elastic contact with a bottom surface 21 a of the annular groove 21 to a pair of local contact pressure distributions A1 and A2, which are shown in Fig. 4, between the to produce inner annular projections 11 and 12 of the sealing ring 10 and the bottom surface 21 a of the annular groove 21 .

The outer annular protrusions 13 and 14 are spaced apart in the axial direction and in elastic contact with the inner peripheral surface 31 of the cylinder 30 by a pair of local contact pressure distributions B1 and B2 between the outer annular protrusions 13 and 14 of the seal ring 10 and the inner peripheral surface 31 to generate the cylinder 30 . The outer annular projection 13 has a first sealing angle C1 on its left side in FIGS . 2 and 3 and a second sealing angle C2 on its right side in FIGS . 2 and 3, which is larger than the first sealing angle C1. The outer annular projection 14 has a first sealing angle C1 on its right side in FIGS . 2 and 3 and a second sealing angle C2 on its left side in FIGS . 2 and 3, which is larger than the first sealing angle C1.

As clearly shown in FIG. 3, the sealing ring 10 has a configuration that is symmetrical with respect to a radial line L shown in FIG. 3 and runs through an axial center of the sealing ring 10 . There is therefore no possibility of error when arranging the sealing ring in the groove 21 .

When the piston 20 moves to the right in FIG. 4, an end portion of the sealing ring 10 , which is provided with the annular projections 11 and 13 , is expanded by frictional forces that exist between the outer annular projections 13 and 14 and the inner peripheral surface 31 of the Cylinder 30 and the high hydraulic pressure are generated, which is applied to a high-pressure side surface of the sealing ring 10 , so that the local contact pressure distribution A1 reduces its contact pressure, but the reduced contact pressure distribution A1 remains at a value which is sufficient to flow with the strongly Block pressurized hydraulic fluid over the inner circumference of the sealing ring 10 . The inner projections 11 and 12 can increase the contact pressure between the sealing ring 10 and the bottom surface 21 a of the groove 21 without increasing the difficulty in arranging the sealing ring 10 in the groove 21 .

The outer annular projections 13 and 14 , which produce the local contact pressure distributions B1 and B2, reduce the frictional force which is generated between the sealing ring 10 and the cylinder 30 , so that the piston 20 can be moved in the cylinder 30 without problems. The sealing angle B2 of the outer annular projection 13 can increase the contact pressure due to the high hydraulic pressure that is applied to the sealing ring 10 , so that the annular projection 13 can block a flow of the highly pressurized hydraulic fluid over the outer circumference of the sealing ring 10 .

Now, 5 and 6, reference is made to Fig. Withdrawn, showing a sealing ring 110 according to the invention. A difference of the sealing ring 110 from the sealing ring 10 shown in FIGS. 1 to 4 is that the first and second outer annular projections 13 and 14 , which are provided on an outer circumference of the sealing ring 110 , in an axial direction of the sealing ring 110 are closer to the axial center of the seal ring 110 than the first and second inner annular projections 11 and 12 , which are on the left and right sides in Figs. 5 and 6, respectively, thereby causing the highly pressurized hydraulic fluid to flow through an outer one The circumference of the sealing ring 110 is blocked by the projection 13 which is arranged on the left (on the low-pressure side).

Reference is now made to FIG. 7, which shows a modified annular groove 211 for receiving the sealing ring 10 shown in FIG. 3. A portion on the left side of a bottom surface 211 a of the groove 211 has a greater depth in order to reduce a contact pressure between the outer annular projection 14 and the cylinder 3 , so that a lubricating hydraulic fluid layer is created between the projection 13 and the cylinder 3 , whereby the piston 20 can be moved in the cylinder 3 without interference.

While the invention is described with reference to that what is currently their preferred embodiments are understood to be understood that the invention is not based on the disclosed embodiments are limited. in the In contrast, the invention is intended to be numerous modifications and equivalent arrangements included within the scope of protection of the appended claims are included.

The invention relates to a sealing ring with a pair of first and second inner annular projections 11 , 12 which are provided on an inner circumference of the sealing ring 10 at an axial distance and are in elastic contact with a bottom surface 21 a of a groove 21 to a Generate a pair of local contact pressure distributions A1, A2; a pair of first and second outer annular projections 13 , 14 which are axially spaced on an outer periphery of the sealing ring 10 and are in elastic contact with an inner peripheral surface of a cylinder 30 to form a pair of local contact pressure distributions B1; Generate B2; each of the first and second outer annular projections 13 , 14 has a first sealing angle C1 on one side and a second sealing angle C2 on its other side which is larger than the first sealing angle C1; and wherein the sealing ring 10 has a configuration that is symmetrical with respect to a radial line passing through an axial center of the sealing ring 10 .

Claims (5)

1. Sealing ring made of an elastic material and arranged in an annular groove ( 21 ; 211 ) which is formed on an outer peripheral surface of a hydraulic piston ( 20 ) which is movable in a cylinder ( 30 ) of a hydraulic device to to seal a gap formed between an outer peripheral surface of the hydraulic piston ( 20 ) and an inner peripheral surface of the cylinder ( 30 ) with
a pair of first and second inner annular projections ( 11 , 12 ) provided on an inner periphery of the sealing ring ( 10 ; 110 ), the first and second inner annular projections ( 11 , 12 ) facing each other in an axial direction of the sealing ring ( 10 ; 110 ) are spaced, wherein the first and second inner annular projections ( 11 , 12 ) are in elastic contact with a bottom surface ( 21 a; 211 a) of the groove ( 21 ; 211 ) to a pair of local contact pressure distributions (A1, A2) between the inner annular projections ( 11 , 12 ) of the sealing ring ( 10 ; 110 ) and the bottom surface ( 21 a; 211 a) of the annular groove ( 21 ; 211 );
a pair of first and second outer annular projections ( 13 , 14 ) provided on an outer periphery of the sealing ring ( 10 ; 110 ), the first and second outer annular projections ( 13 , 14 ) being spaced apart in the axial direction, wherein the first and second annular projections ( 13 , 14 ) are in elastic contact with the inner peripheral surface of the cylinder ( 30 ) by a pair of local contact pressure distributions ( 31 ; 32 ) between the outer annular projections ( 13 , 14 ) of the sealing ring ( 10 ; 110 ) and the inner peripheral surface of the cylinder ( 30 );
each of the first and second outer annular projections ( 13 , 14 ) has a first sealing angle (C1) on one side and a second sealing angle (C2) on its other side which is larger than the first sealing angle (C1); and
wherein the sealing ring ( 10 ; 110 ) has a configuration that is symmetrical with respect to a radial line passing through an axial center of the sealing ring ( 10 ; 110 ).
2. Sealing ring according to claim 1, characterized in that the one side of the first outer annular projection ( 13 ) to the one side of the second outer annular projection ( 14 ).
3. Sealing ring according to claim 1, characterized in that the other side of the first outer annular projection ( 13 ) to the other side of the second outer annular projection ( 14 ).
4. Sealing ring according to claim 3, characterized in that a low-pressure-side portion of the bottom surface ( 211 a) of the annular groove ( 211 ) of the hydraulic piston ( 20 ) has a greater depth to a contact pressure between one of the outer annular projections ( 13 , 14 ) which is in the annular groove ( 211 ) on a low pressure side, and to reduce the inner peripheral surface of the cylinder ( 30 ).
5. Sealing ring according to claim 1, characterized in that the piston ( 20 ) is a piston of a hydraulic pump.
DE19814145A 1997-03-31 1998-03-30 Elastic sealing ring in annular groove Ceased DE19814145A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9081247A JPH10274335A (en) 1997-03-31 1997-03-31 Seal ring

Publications (1)

Publication Number Publication Date
DE19814145A1 true DE19814145A1 (en) 1998-10-15

Family

ID=13741078

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19814145A Ceased DE19814145A1 (en) 1997-03-31 1998-03-30 Elastic sealing ring in annular groove

Country Status (2)

Country Link
JP (1) JPH10274335A (en)
DE (1) DE19814145A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010015438A1 (en) * 2008-08-05 2010-02-11 Robert Bosch Gmbh Seal arrangement
WO2011060984A1 (en) * 2009-11-23 2011-05-26 Robert Bosch Gmbh Sealing ring, in particular for a hydraulic piston pump
US8474829B2 (en) 2009-02-24 2013-07-02 Nok Corporation Sealing device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4520729B2 (en) * 2003-11-25 2010-08-11 Nok株式会社 Sealing device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010015438A1 (en) * 2008-08-05 2010-02-11 Robert Bosch Gmbh Seal arrangement
US8474829B2 (en) 2009-02-24 2013-07-02 Nok Corporation Sealing device
WO2011060984A1 (en) * 2009-11-23 2011-05-26 Robert Bosch Gmbh Sealing ring, in particular for a hydraulic piston pump
CN102656394A (en) * 2009-11-23 2012-09-05 罗伯特·博世有限公司 Sealing ring, in particular for a hydraulic piston pump
US20120279388A1 (en) * 2009-11-23 2012-11-08 Robert Bosch Gmbh Sealing Ring, in Particular for a Hydraulic Piston Pump
US9109705B2 (en) 2009-11-23 2015-08-18 Robert Bosch Gmbh Sealing ring, in particular for a hydraulic piston pump
CN102656394B (en) * 2009-11-23 2015-11-25 罗伯特·博世有限公司 Seal ring, especially for the seal ring of hydraulic piston pump

Also Published As

Publication number Publication date
JPH10274335A (en) 1998-10-13

Similar Documents

Publication Publication Date Title
US4172599A (en) Pressure-balanced packing
CA2380795C (en) Primary rod and piston seal
EP0396441B1 (en) Bi-Directional, non-contact face seal
EP0922891B1 (en) Rotary, reciprocating seals with internal metal band
EP2492551B1 (en) Hydrodynamic rotary seal with opposed tapering seal lips
EP0670444B1 (en) Sealing arrangement
CA2391838C (en) Symmetrical gasket for a pipe joint with increased surface contact
US5921555A (en) Uni-directional seal for use on a shaft
US2420104A (en) Seal guard ring
US3305241A (en) Packing ring structure
CA1274864A (en) Seal
EP0112959B1 (en) Seal
US6209882B1 (en) Lip seal for sealing cylindrical surfaces
US6685194B2 (en) Hydrodynamic rotary seal with varying slope
DE60306883T2 (en) Backlash-free support ring for elastomer seal and flange
US7052020B2 (en) Hydrodynamic rotary seal
EP0125896B1 (en) Shaft seals
US2862736A (en) Sealing assembly of packing rings of different qualities
US7134671B2 (en) Lip seal having increased contact force at interface and apparatus incorporating the same
US4566702A (en) Seal assembly with improved low pressure sealing ring
RU2309316C2 (en) Distance ring
DE4333244C2 (en) Rod or piston seal
US3275331A (en) Seal and method of manufacture
US4840379A (en) Split sealing ring having a bias cut
EP2385278B1 (en) Low breakout friction energized gasket

Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8131 Rejection