EP3662162A1 - Dichtring einer kolbenpumpe - Google Patents
Dichtring einer kolbenpumpeInfo
- Publication number
- EP3662162A1 EP3662162A1 EP18750111.9A EP18750111A EP3662162A1 EP 3662162 A1 EP3662162 A1 EP 3662162A1 EP 18750111 A EP18750111 A EP 18750111A EP 3662162 A1 EP3662162 A1 EP 3662162A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing ring
- piston
- sealing
- ring portion
- facing
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0408—Pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0421—Cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0448—Sealing means, e.g. for shafts or housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/02—Packing the free space between cylinders and pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/143—Sealing provided on the piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
- F04B53/162—Adaptations of cylinders
- F04B53/164—Stoffing boxes
-
- 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
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
-
- 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
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/4031—Pump units characterised by their construction or mounting
Definitions
- the invention relates to a sealing ring of a piston pump, in particular for a vehicle brake system, which has a sealing surface for application to a
- Piston outer surface of an associated piston has.
- Sealing rings for hydraulic piston pumps for sealing a filled with a hydraulic fluid to be sealed space within a housing usually have a substantially smooth sealing surface which abuts a retractable in a cylinder interior and piston. This creates friction between the sealing surface of the sealing ring and the piston outer surface, which can lead to wear of the sealing ring.
- Hydraulic units are used to convey pressure medium within the hydraulic system of the vehicle brake system.
- These piston pumps are also referred to as pump elements.
- pump elements typically, these pump elements include a suction space in their housing
- Piston outer surface or piston running surface is often designed as a cylinder high pressure side.
- valves serve to control the fluid during the pumping movement of the piston.
- the inlet valve does not serve the liquid during the compression phase in the suction chamber
- the outlet valve prevents backflow of the liquid from the pressure side of the pump element into the pump interior.
- the piston guides are within the housing
- low pressure side formed with a guide ring, sealing ring and a support ring and is held by a pump filter in position.
- a hydraulic seal for pistons and rods with at least one sealing ring is known, which is urged by a clamping ring against the associated piston and designed on its sealing surface with a sealed space to a sealing edge and a side facing away from the sealed space flat sealing edge is. Between the two sealing edges, the actual sealing edge is formed.
- a sealing ring of a piston pump of a vehicle brake system having a sealing surface for application to a sealed piston outer surface of an associated piston and is formed from a first and a second sealing ring portion, which are integrally connected to each other, wherein the first sealing ring portion of the Piston outer surface facing side of the sealing ring arranged and made of a first material and the second sealing ring portion disposed on the side facing away from the piston outer surface of the sealing ring and is made of a second material.
- the invention initially provides advantages in terms of the dimensional accuracy of its outer dimensions, because the present invention of two sections integrally assembled sealing ring is to produce in its preparation as a whole unit with very small dimensional tolerances. Furthermore, the present invention of two sections integrally assembled sealing ring is to produce in its preparation as a whole unit with very small dimensional tolerances. Furthermore, the present invention of two sections integrally assembled sealing ring is to produce in its preparation as a whole unit with very small dimensional tolerances. Furthermore, the present invention of two sections integrally assembled sealing ring is to produce in its preparation as a whole unit with very small dimensional tolerances. Furthermore, the present invention of two sections integrally assembled sealing ring is to produce in its preparation as a whole unit with very small dimensional tolerances. Furthermore, the present invention of two sections integrally assembled sealing ring is to produce in its preparation as a whole unit with very small dimensional tolerances. Furthermore, the present invention of two sections integrally assembled sealing ring is to produce in its preparation as a whole unit with very small dimensional tolerances. Furthermore, the present invention of two
- the first sealing ring section can be designed and adjusted in a particularly targeted manner for the desired sealing function and the second sealing ring section can be specifically targeted to the desired adjustment function.
- the second sealing ring section can be specifically targeted to the desired adjustment function.
- the first material of the first sealing ring section advantageously has a greater degree of hardness than the second material of the second sealing ring section.
- the first sealing ring portion thus has a higher abrasion resistance, while the second sealing ring portion provides a higher elasticity for the readjustment of the sealing surface towards the piston outer surface.
- the first material is particularly preferably a thermoplastic, in particular polytetrafluoroethylene.
- Thermoplastics are plastics that consist of long linear molecules. By supplying energy, these materials become soft and malleable as often as desired and finally melt. They can be brought into the desired shape by various original and forming processes. After the workpiece cools, it retains its shape.
- thermoplastics polyblend.
- Polytetrafluoroethylene abbreviation PTFE, occasionally polytetrafluoroethene
- PTFE polytetrafluoroethylene
- Teflon Du Pont Teflon Du Pont.
- PTFE is one of the thermoplastics, although it also has properties that require a more typical for thermosetting plastics processing.
- the thermoplastic is dimensionally stable, provides high seal quality, and ensures that the seal between adjacent components can not be damaged by compression or jamming due to shear forces between the piston and seal. In such a sealing ring according to the invention can then be dispensed with an adjacent support ring.
- the second material is preferably an elastomer. Due to pressure or elongation, elastomers can change their shape for a short time. Upon completion of compression or stretching, the elastomer quickly returns to its original shape. The elastomers are cross-linked and therefore flexible.
- Elastomers include all types of crosslinked rubber.
- the crosslinking takes place, for example, by vulcanization with sulfur, by means of peroxides, Metal oxides or irradiation.
- Preferred elastomers are natural rubber (NR), acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), butadiene rubber (BR) and ethylene-propylene-diene rubber (EPDM).
- NR natural rubber
- NBR acrylonitrile-butadiene rubber
- SBR styrene-butadiene rubber
- CR chloroprene rubber
- BR butadiene rubber
- EPDM ethylene-propylene-diene rubber
- At the first sealing ring section is particularly preferably at least one
- the first sealing ring section is preferably annular and the at least one through opening is formed on the radially outer part of the first sealing ring section.
- a plurality of circumferentially uniformly distributed through holes arranged on the circumference of the first sealing ring portion are provided for a permanently positive connection between the two sealing ring portions according to the invention, which then advantageously extend in the axial direction.
- the surface according to the invention initially protrudes slightly with respect to the outer surface of the piston when the piston is not mounted, and is therefore urged against the piston during and after assembly of the piston by the particularly elastic second sealing ring section.
- This leakage can advantageously be adjusted so that it provides a defined lubricating film on the sealing surface, so that the
- the leakage can be set so low or a recovery of the fluid from the sealing surface in the pressure chamber to be sealed, that no significant leakage occurs, which is adjacent to functional impairments
- the contour of the sealing surface can thus also be adapted to the speed of the piston on the sealing ring according to the invention.
- the retraction speed of the piston may be different to the
- the extension speed of the piston can be adjusted via an asymmetry of an eccentric driving the piston.
- a ratio in which the retraction speed is greater than the retraction speed is set if no or only a slight leakage or a reclamation of the fluid is desired.
- a ratio in which the running-in speed is less than the running-out speed is set when a higher leakage, for example, for forming a lubricating film, is desired.
- the contour of the sealing surface according to the invention is always adapted in relation to the ratio of retraction to extension speed such that a defined leakage is provided.
- the first sealing ring section is preferably designed with a piston guide adjacent the sealing surface also for application to the piston outer surface.
- the piston guide is preferably at the sealed from the
- the piston guide is designed in particular with a flexible elastomer base, the second Sealing ring portion is formed, and a stable, applied to the piston plastic superstructure, which is formed by the first sealing ring portion.
- the first sealing ring portion is also advantageously designed with a radially outwardly facing, concave pan.
- the tub stabilizes the
- first sealing ring portion with their radially outward and thus directed towards the surrounding housing tub edges the first sealing ring portion within the housing in addition.
- the second sealing ring section is preferably designed with a pressure groove facing a space to be sealed.
- the pressure groove leads to an additional pressure support from the space to be sealed against the second
- 1 is a partial longitudinal section of a piston pump with a
- FIG. 2 shows a partial longitudinal section of a piston pump with a sealing ring according to the invention
- FIG. 3 shows a longitudinal section of the sealing ring according to FIG. 2, FIG.
- Fig. 4 shows the section IV - IV of FIG. 3 and
- FIG. 5 shows the longitudinal section of the sealing ring of FIG. 3 in an enlarged
- a piston pump 10 is a vehicle brake system with her
- Housing 12 and a displaceably mounted therein piston 14 is shown.
- the piston 14 is to be moved by means of an eccentric 16 within a piston bore 18 formed in the housing 12.
- Dichtungsanorndung 20 arranged on the one hand rests radially on the outside of the housing 12 and on the other hand radially inwardly on the piston 14.
- the seal assembly 20th thereby separates a space 24 to be sealed, in which a pump pressure arises during operation of the piston pump 10, from a space 24
- the piston 14 is displaceable for pressure build-up along its piston axis 26 in the space to be sealed 24.
- the seal assembly 20 is designed with a guide ring 28, a support ring 30 and a sealing ring 32. From a pump filter 34 is the
- Seal assembly 20 retained in the housing 12 in the axial direction.
- the guide ring 28 is located on the side facing the space 24 of the seal assembly 20.
- the guide ring 28 is radially outwardly supported on the housing 12 and is located radially inwardly on a cylindrical piston outer surface 36 of the piston 14 at. In this way, the piston 14 is guided deliberately during its movement and supported transversely to the piston axis 26.
- the support ring 30 is located between the guide ring 28 and the sealing ring 32 and prevents the sealing ring 32 could be clamped when moving the piston under the guide ring 28.
- the sealing ring 32 establishes the actual fluid seal between the space 22 and the space 24.
- an inventive sealing ring 32 is shown as it is installed on such a piston pump 10.
- the sealing ring 32 also surrounds the cylindrical piston outer surface 36 of a piston 14 and supports itself radially on the outside on a housing 12.
- the direct ring 38 is formed from a first sealing ring portion 40 and a second sealing ring portion 42.
- the sealing ring portions 40 and 42 are integrally connected to each other.
- the second sealing ring section 42 has been applied externally to the first sealing ring section 40 by means of an injection molding process.
- the first sealing ring portion 40 is located on the piston outer surface 36 facing radially inner side of the sealing ring 38 and is made of a first material, namely a thermoplastic.
- the second sealing ring portion 42 is located on the side remote from the piston outer surface 36, radially outer side of the sealing ring 32 and is made of a second material, namely an elastomer.
- the thermoplastic has a higher degree of hardness than the elastomer.
- the first sealing ring portion 40 has a radially outer portion 44 in the form of an annular disc, in the distributed over the circumference at equal angular intervals a total of twelve through holes 46 each in the direction of the piston axis 26, ie in the axial direction, are formed.
- the passage openings 46 are filled with material of the second sealing ring portion 42 and thus create a stable, positive connection between the sealing portions 40 and 42.
- the first sealing ring portion 40 is also radially outward with a in the
- first sealing ring portion 40 projects relatively far at its axial end portion radially outward. This results in a particularly stably supported in the housing 12 for the comparatively stiff designed first sealing ring portion 40 at this end
- Sealing ring portion 42 is a concave pressure groove 50, by means of which the second sealing ring portion 42 is additionally urged radially against the housing 12 at pressure increase in the space to be sealed 22 radially outward.
- a sealing surface 52 configured sealingly abuts the piston outer surface 36.
- the sealing surface 52 is designed with a facing the space to be sealed 22 steep sealing flank 54 and to the space 24 with ambient pressure flat sealing flank 56. Between the two sealing flanks 54 and 56 is the actual, abutting the piston outer surface sealing edge 58th At the space 24 facing the axial region adjacent to the sealing surface 52 is located on the sealing ring 32, a piston guide 60.
- the piston guide 60 is viewed in cross section as a block designed with a
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017213320.1A DE102017213320A1 (de) | 2017-08-02 | 2017-08-02 | Dichtring einer Kolbenpumpe, insbesondere für eine Fahrzeugbremsanlage |
PCT/EP2018/069647 WO2019025202A1 (de) | 2017-08-02 | 2018-07-19 | Dichtring einer kolbenpumpe |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3662162A1 true EP3662162A1 (de) | 2020-06-10 |
Family
ID=63108517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18750111.9A Withdrawn EP3662162A1 (de) | 2017-08-02 | 2018-07-19 | Dichtring einer kolbenpumpe |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3662162A1 (de) |
DE (1) | DE102017213320A1 (de) |
WO (1) | WO2019025202A1 (de) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3606886C2 (de) | 1986-03-03 | 1993-12-09 | Busak & Luyken Gmbh & Co | Dichtung für hydraulische Kolben und Kolbenstangen |
DE10123038A1 (de) * | 2001-05-11 | 2002-11-14 | Bosch Gmbh Robert | Führungsring-Anordnung |
DE102005045937B4 (de) * | 2005-09-26 | 2014-10-30 | Robert Bosch Gmbh | Kolbenpumpe für eine Schlupfregelung aufweisende Fahrzeugbremsanlage |
PL1847736T3 (pl) * | 2006-04-19 | 2009-02-27 | Freudenberg Carl Kg | Układ uszczelniający |
DE102009045634A1 (de) * | 2009-10-13 | 2011-04-14 | Robert Bosch Gmbh | Dichtungsanordnung eines Pumpenkolbens einer Kolbenpumpe |
DE102013224832A1 (de) * | 2013-12-04 | 2015-06-11 | Robert Bosch Gmbh | Dichtungseinrichtung, Kolbenpumpe |
DE102015105933B4 (de) * | 2015-04-17 | 2018-04-26 | Schwäbische Hüttenwerke Automotive GmbH | Pumpe |
-
2017
- 2017-08-02 DE DE102017213320.1A patent/DE102017213320A1/de active Pending
-
2018
- 2018-07-19 EP EP18750111.9A patent/EP3662162A1/de not_active Withdrawn
- 2018-07-19 WO PCT/EP2018/069647 patent/WO2019025202A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
DE102017213320A1 (de) | 2019-02-07 |
WO2019025202A1 (de) | 2019-02-07 |
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