WO2013026435A1 - Sealing ring for a clutch release system having an annular hydraulic working cylinder - Google Patents
Sealing ring for a clutch release system having an annular hydraulic working cylinder Download PDFInfo
- Publication number
- WO2013026435A1 WO2013026435A1 PCT/DE2012/000777 DE2012000777W WO2013026435A1 WO 2013026435 A1 WO2013026435 A1 WO 2013026435A1 DE 2012000777 W DE2012000777 W DE 2012000777W WO 2013026435 A1 WO2013026435 A1 WO 2013026435A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sealing ring
- ring according
- sealing
- cylinder
- working cylinder
- Prior art date
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
- F16D25/00—Fluid-actuated clutches
- F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
- F16D25/082—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members co-inciding with the axis of rotation
- F16D25/083—Actuators therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
-
- 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
- F16D2300/00—Special features for couplings or clutches
- F16D2300/08—Details or arrangements of sealings not provided for in group F16D3/84
Definitions
- the invention relates to a sealing ring for a Kupplungsaus Wegsystem with an annular hydraulic cylinder for the clutch actuation.
- the working cylinder is preferably the slave cylinder of the clutch release system.
- Clutch release systems with annularly arranged hydraulic slave cylinders are known. This type of clutch release is also referred to as a "concentric slave cylinder” (CSC) .
- the slave cylinder comprises an annular piston, which is usually an injection-molded component.
- This type of clutch release requires an annular seal of the hydraulic slave cylinder, which is realized by a sealing ring made of an elastic material.
- a sealing ring made of an elastic material.
- vulcanized profile rings with different rubber formulations used.
- a synthetic rubber of an ethylene-propylene-diene monomer (EPDM) is preferred because of its material properties.
- EPDM ethylene-propylene-diene monomer
- EPDM sealing rings Such a sealing ring made of EPDM experiences during use large volume losses. In addition, very high frictional forces occur. Since they are susceptible to wear, EPDM sealing rings require very good or smooth surfaces on the running surfaces. Furthermore, EPDM sealing rings are temperature prone and relatively expensive.
- a particular disadvantage is the ever-increasing leakage rate, since the hydraulic fluid in the clutch housing and can contaminate the clutch in unfavorable operating conditions.
- the object of the present invention is to provide a sealing ring for a
- Hydrautch Release System includes the entirety of all components necessary to build such a system, which is operated by a hydraulic power cylinder.
- “Hydraulic working cylinder” here describes a structural unit which encloses with an annular piston, annular cylinder walls and a bottom wall an annular, dense cylinder space in which a pressure is built up by a flowing and pressurized medium, which causes a linear displacement of the piston
- a concentric passage for parts, for example a shaft, of a drive train is formed inside the working cylinder.
- “Sealing ring” describes a single component, which closes the concentrically arranged cylinder space from the environment, is linearly movable in this and has a firm connection to the annular piston of the hydraulic working cylinder.
- the present sealing ring consists of an elastomeric material which is thermoplastically processable;
- the present sealing ring can be produced by an injection molding process.
- the sealing ring according to the invention can therefore be produced from a material with properties already known prior to production. It is no longer necessary to wait for the result of a crosslinking reaction and the imponderables associated with it remain excluded.
- the sealing ring according to the invention can be produced with a desired outer shape, a high dimensional accuracy, a modulus of elasticity kept in narrow ranges of values and with small shrinkage values to be calculated in advance.
- an essential inventive step is the transition from crosslinking (vulcanization) to thermal processing of an elastomeric material.
- a preferred embodiment of the sealing ring is formed when a thermoplastically processable polyurethane (TPU) is used as the elastomer.
- TPU thermoplastically processable polyurethane
- a sealing ring with a Y-shaped profile cross-section in which the outer cylinder wall of the working cylinder facing leg is shorter or smaller than the inner cylinder wall facing legs. Taking into account that the surface pressure increases under the action of a hydraulic medium, the leg facing the inner cylinder wall is pressed more strongly against the cylinder wall.
- a further improvement can be achieved in that the profile is designed sawtooth on the outer sides of the sealing lips and the resulting peaks are aligned in the direction of the cylinder interior.
- the sealing rings according to the invention since the proposed material has a better long-term behavior compared to previously used EPDM materials. Thus, if necessary, maintenance intervals can be extended.
- Base material in the basic material contains additives that reduce friction, such as oils, greases, graphite or other solid-state lubricants. This makes it possible on the one hand avoid greasing the seal ring in the assembly process, on the other hand, consistent friction conditions are ensured over a longer period.
- Figure 1 is a sectional view of a clutch release system with an inventive, ring-shaped hydraulic cylinder and
- FIG. 2 shows a preferred profile shape for the sealing ring according to the invention.
- a clutch release system 1 comprises a ring-shaped hydraulic working cylinder whose cylinder chamber 6 is preferably formed by an outer cylinder wall 2, an inner concentric inner cylinder wall 3 and a bottom wall 4 formed thereon.
- the bottom wall 4 is preferably via an annular seal 5 tightly connected to the outer cylinder wall 2 in connection.
- the cylinder wall 2 may be part of the housing of the clutch release system 1.
- An annular piston 7 is fixed on its side facing the bottom wall 4 with the present sealing ring 8 via a holding element 9.
- a recess 10 formed concentrically in the inner cylinder wall 3 serves to receive parts of the drive train, these parts not being essential to the invention and therefore not shown in FIG. It is also conceivable to form the cylinder chamber 6 by other elements.
- the sealing ring 8 has a substantially rectangular cross-section, wherein on its side facing away from the cylinder space 6 a rib 12 is arranged uniformly material, can be made by the according to Figure 1, a positive connection with the holding element 9.
- the sealing ring 8 On the cylinder side, the sealing ring 8 has a Y-shaped profile with an outer leg 13 and an inner, elongated The outer contour 15 of the sealing ring 8 is profiled, wherein the outer leg 13 preferably sawtooth-shaped sealing lips 16, 17 and 18 and the inner leg 14 preferably also sawtooth-shaped sealing lips 19, 20 and 21 are arranged. These sawtooth-shaped sealing lips reduce the existing contact surface in the area of the sealing surfaces and thereby ensure lower frictional forces.
- the sawtooth shape of the sealing lips 16, 17, 18, 19, 20 and 21 causes further, that these sealing lips erect when retracting the piston 7 in the cylinder chamber 6 and attachments of the hydraulic medium contained in the cylinder chamber 6 to the cylinder walls 2, 3 in a sense of scrape it off.
- a low leakage rate and also low frictional forces can be achieved by this profile form.
- the present sealing ring 8 consists of a thermoplastically processable elastomer (TPE) material.
- TPU thermoplastically processable polyurethane
- This material has excellent friction properties and is less susceptible to wear.
- TPU can be processed easily and inexpensively like a thermoplastic. It is stiffer than an EPDM material, which reduces volume uptake and allows higher pressures. It is particularly advantageous that the TPU material may include lubricants, which is why a lubrication is not required.
- the choice of material according to the invention also ensures that the marked decrease in the characteristic values present in the previously used material EPDM no longer occurs and the long-term stability is markedly improved.
- a further embodiment according to the invention of the sealing ring 8 consists in incorporating into the material the additives which reduce the coefficient of friction, such as oil, grease or solid lubricants, which the base material releases successively during the service life of the sealing ring 8.
- the sealing ring 8 can be dispensed with during assembly on greasing, which considerable time and cost savings can be achieved.
- the invention thus has the advantage that by replacing the known sealing rings made of EPDM by sealing rings of TPE, in particular TPU, and by an adapted profile Design of the sealing rings improved friction conditions at low leakage rate and long service life of the sealing rings can be achieved.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sealing Devices (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112012003477.5T DE112012003477A5 (en) | 2011-08-22 | 2012-08-02 | Sealing ring for a clutch release system with an annular hydraulic power cylinder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011081299 | 2011-08-22 | ||
DE102011081299.7 | 2011-08-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013026435A1 true WO2013026435A1 (en) | 2013-02-28 |
Family
ID=47665423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2012/000777 WO2013026435A1 (en) | 2011-08-22 | 2012-08-02 | Sealing ring for a clutch release system having an annular hydraulic working cylinder |
Country Status (2)
Country | Link |
---|---|
DE (2) | DE112012003477A5 (en) |
WO (1) | WO2013026435A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106678181A (en) * | 2017-03-08 | 2017-05-17 | 菲斯达排放控制装置(苏州)有限公司 | Clutch seal ring |
CN111051723A (en) * | 2017-09-01 | 2020-04-21 | 舍弗勒技术股份两合公司 | Piston seal assembly for clutch release system and clutch release system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014213622B4 (en) | 2013-08-07 | 2024-02-15 | Schaeffler Technologies AG & Co. KG | Seal, especially for a master cylinder |
DE102018116272A1 (en) * | 2018-07-05 | 2020-01-09 | Schaeffler Technologies AG & Co. KG | Slave cylinder with sealing ring carrier |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3833228A (en) * | 1973-07-19 | 1974-09-03 | Chenprene Inc | Stackable sealing mechanism |
GB1472925A (en) * | 1973-05-07 | 1977-05-11 | Chemprene | Packing |
US4053166A (en) * | 1975-12-08 | 1977-10-11 | Halogen Insulator & Seal Corporation | Two-piece seal |
GB2259346A (en) * | 1991-09-04 | 1993-03-10 | Fichtel & Sachs Ag | Hydraulically actuable releaser, with seal supporting ring, for a motor vehicle friction clutch |
DE19949205A1 (en) * | 1998-10-15 | 2000-04-20 | Luk Lamellen & Kupplungsbau | Carrier and seal with undercut section used in hydraulic declutching system between vehicle engine and gearbox, offers increased life and reduced friction with less wear and noise |
US20070278749A1 (en) * | 2006-06-01 | 2007-12-06 | Nakanishi Nobuhiro | U-packing and fluid pressure single acting cylinder |
-
2012
- 2012-08-02 WO PCT/DE2012/000777 patent/WO2013026435A1/en active Application Filing
- 2012-08-02 DE DE112012003477.5T patent/DE112012003477A5/en not_active Withdrawn
- 2012-08-02 DE DE102012213720A patent/DE102012213720A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1472925A (en) * | 1973-05-07 | 1977-05-11 | Chemprene | Packing |
US3833228A (en) * | 1973-07-19 | 1974-09-03 | Chenprene Inc | Stackable sealing mechanism |
US4053166A (en) * | 1975-12-08 | 1977-10-11 | Halogen Insulator & Seal Corporation | Two-piece seal |
GB2259346A (en) * | 1991-09-04 | 1993-03-10 | Fichtel & Sachs Ag | Hydraulically actuable releaser, with seal supporting ring, for a motor vehicle friction clutch |
DE19949205A1 (en) * | 1998-10-15 | 2000-04-20 | Luk Lamellen & Kupplungsbau | Carrier and seal with undercut section used in hydraulic declutching system between vehicle engine and gearbox, offers increased life and reduced friction with less wear and noise |
US20070278749A1 (en) * | 2006-06-01 | 2007-12-06 | Nakanishi Nobuhiro | U-packing and fluid pressure single acting cylinder |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106678181A (en) * | 2017-03-08 | 2017-05-17 | 菲斯达排放控制装置(苏州)有限公司 | Clutch seal ring |
CN111051723A (en) * | 2017-09-01 | 2020-04-21 | 舍弗勒技术股份两合公司 | Piston seal assembly for clutch release system and clutch release system |
CN111051723B (en) * | 2017-09-01 | 2022-01-21 | 舍弗勒技术股份两合公司 | Piston seal assembly for clutch release system and clutch release system |
Also Published As
Publication number | Publication date |
---|---|
DE102012213720A1 (en) | 2013-02-28 |
DE112012003477A5 (en) | 2014-04-30 |
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