WO2012175186A1 - Lever spring - Google Patents
Lever spring Download PDFInfo
- Publication number
- WO2012175186A1 WO2012175186A1 PCT/EP2012/002557 EP2012002557W WO2012175186A1 WO 2012175186 A1 WO2012175186 A1 WO 2012175186A1 EP 2012002557 W EP2012002557 W EP 2012002557W WO 2012175186 A1 WO2012175186 A1 WO 2012175186A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spring
- force
- lever
- lever spring
- clutch
- 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
- F16D13/00—Friction clutches
- F16D13/58—Details
- F16D13/583—Diaphragm-springs, e.g. Belleville
Definitions
- the invention relates to a lever spring for a clutch, in particular for a friction clutch with a wear adjustment device, for a motor vehicle comprising lever elements for transmitting a force for opening or closing the clutch, and a force edge connected to the lever elements.
- the lever spring can be arranged in a compressed friction clutch, wherein the
- Friction clutch may be a partial clutch, for example, a dual clutch or hybrid clutch.
- the friction clutch comprises a counterplate and at least one pressure plate axially displaceable relative to the counterplate.
- the pressure plate can be displaced in the axial direction via the lever spring, which is supported on a housing and radially inwardly in the axial direction can be acted upon by an actuating element with a force. Due to the axial displacement of the pressure plate relative to the counter-plate, a frictional engagement of friction linings, which can be arranged between the counter-plate and the pressure plate, are controlled.
- the friction linings may comprise a pad spring, wherein the Pad spring, in particular in a closed state in which an operating torque is transferable, causes a pad spring force, which acts substantially opposite to the force of the lever spring.
- the friction clutch may have a wear adjusting device, which can compensate for wear of the friction linings, for example by broadening the pressure plate in the axial direction. Thereby, a change in the path-dependent spring characteristics, in particular the lever spring can be avoided, whereby the operating point of the lever spring over the life can be kept substantially constant.
- the lever spring may be in the form of an axially clampable disc spring, for example as a stamped sheet metal part, wherein the lever spring has a resilient, annular base body, the force edge, and from this radially inwardly extending, the lever elements forming tongues.
- the lever spring in particular the force edge and / or the lever elements, have a thickness s which, for example, corresponds to the thickness of the material, for example a spring plate, from which the lever spring has been made.
- the lever spring for example in the form of a plate spring, has an installation height h 0 .
- the installation height h 0 corresponds to the distance by which the lever spring, for example, measured from radially outside to radially inside, increases in the axial direction.
- the lever spring may be mounted on the housing in such a way that, when the lever elements are subjected to an axial force, for example an engagement force in the direction of the counterplate, the force edge of the lever spring will move in an opposite direction to the axial force and thereby connect to the force edge Pressure plate can be moved away in the axial direction of the counter plate or weghebelt. As a result, the friction engagement of the friction clutch can be separated and the clutch can thus be opened. In an unbiased position, with a closed friction clutch, the forces of the lever spring and the pad spring are in balance.
- an axial force for example an engagement force in the direction of the counterplate
- the force with which the lever spring radially outward on the force of the force applied to the pressure plate must be reduced, which can be effected by an axially inwardly directed force on the lever elements.
- the pad spring can spring down substantially completely, the force of the edge must travel a corresponding way, so that the pressure plate can perform a corresponding axial movement away from the counter-plate.
- the force, the engagement force, with which the lever elements must be acted upon to open the friction clutch, at the beginning of the opening process substantially corresponds to the difference between the force of the lever spring and the force of the pad spring. Due to the inventive design of the lever spring, the spring force of the lever spring does not increase steadily with increasing actuation.
- the lever spring Due to the design of the lever spring as a snap spring, which folds down or snap over from a certain travel, wherein the umschnappte lever spring a spring force in the fore generated ago direction opposite direction, the lever spring force, in particular on the force edge, act in the direction of the pad spring force.
- the lever spring may at least partially have a degressive spring characteristic, which is adjustable in dependence on the installation height h 0 to the thickness s of the lever spring, wherein the spring characteristic of a snap spring is at least partially in a negative spring force range.
- the lever spring By snapping the lever spring, in particular the force edge, the lever spring can support the engagement process by means of an internal force compensation, whereby the required engagement force for actuating the lever spring and to open the friction clutch, especially at a predetermined actuation path, can be significantly reduced.
- Snap spring is a cost effective way to reduce the engagement forces.
- the spring characteristic of the lever spring is adjustable in particular as a function of the installation height h 0 and the thickness s of the lever spring.
- the ratio a of the installation height h 0 to the thickness s of the lever spring is adjustable such that the lever spring at least partially has a degressive spring characteristic.
- the spring characteristic may at least partially have a negative spring force, for example in a snap spring.
- the ratio a of the installation height h 0 to the thickness s is to be set as high as possible.
- the invention further relates to a clutch, in particular a friction clutch, for a
- the invention further relates to a dual clutch for a motor vehicle with at least one lever spring which has been designed and developed as described above.
- the invention will be explained by way of example with reference to the accompanying drawings with reference to a preferred embodiment.
- Fig. 1 a schematic representation of a dual clutch with at least one
- Fig. 2 a force-displacement diagram with different spring characteristics of a normally open coupling
- Fig. 3 a force-displacement diagram with different spring characteristics of a normal
- Fig. 5 to 7 a force-displacement diagram of a lever spring with different installation heights.
- the double clutch 10 shown in FIG. 1 has two partial clutches, which each have a pressure plate 14 axially displaceable relative to a counter plate 12, wherein in a closed state of the partial clutches between the pressure plates 14 and the counter plate 12 friction linings 16 are clamped non-positively to transmit torque.
- the pressure plates 14 are axially displaceable by means of lever springs 18, wherein the lever springs 18 may be mounted on a housing (not shown).
- the lever springs 18 have a radially outwardly arranged force edge 20, which is annular. At the force edge 20 lever elements 22 are arranged, which extend tongue-like radially inward. In the region of the force edge 20, the lever spring can be movably mounted to be movable in a bearing 24.
- the force edge 20 can contact the pressure plate 14 for essentially axial force transmission from the force edge 20 to the pressure plate 14.
- the lever elements 22 can be acted on radially inwardly via an actuating element (not shown) with a substantially axial force, an engagement force.
- the lever elements 22 can execute an axial movement in the direction of the counterplate 12, wherein the force edge 20 of the lever spring 18 can move away from the counterplate 12 in the axial direction via the bearing 24.
- the pressure plate 14 in the axial direction be moved away on the friction linings 16 and the friction clutch or part clutch can be opened.
- the friction linings 16 may have a padding spring (not shown), wherein in particular in a closed state of the partial couplings, the forces of the pad springs and the lever springs 18 may be in equilibrium.
- the dual clutch 10 is shown in an open state, wherein the pressure plates 14 are moved away from the friction linings 16, whereby no torque via the partial clutches is transferable.
- the force-displacement diagram ( Figure 2) shows a lever spring characteristic 26 of a lever spring (not shown) and a pad spring characteristic 28 of a pad spring (not shown) of a normally open coupling.
- the pad spring characteristic 28 has a maximum value in a closed state of the clutch, when the friction linings are subjected to maximum force. With increasing opening, contrary to the illustrated actuating direction, the force of the pad spring is reduced until the pad spring is completely rebounded in an open state of the clutch, and thus the pad spring force is substantially zero.
- the lever spring characteristic 26, which can represent a force acting on the force edge of the lever spring has a region-wise substantially parallel course to the pad spring characteristic 28.
- the difference of the spring characteristics is the engagement force 30 required for actuating the clutch, which is represented by double arrows.
- the engagement force 30 has a substantially constant value.
- the lever spring characteristic curve 26 has a region with a negative lever spring force in the area of the almost completely spring-loaded pad spring, wherein the minimum of the lever spring characteristic curve 26 is also in the range of the negative lever spring force. This can be achieved by the design of the lever spring as a snap spring, which can reverse the direction of the spring force in certain areas.
- the force-displacement diagram ( Figure 3) shows a lever spring characteristic 26 of a lever spring (not shown) and a pad spring characteristic 28 of a pad spring (not shown) of a normally closed clutch.
- the pad spring characteristic 28 is below the lever spring characteristic 26, the characteristics close to the maximum of the lever spring characteristic 26 have an intersection in which the pad spring characteristic 28 can begin, for example, in a closed state clutch, in which the pad spring force and the lever spring force are in equilibrium, at the same time greatest acting spring force, which ensures a reliable torque transmission through the clutch.
- a release force 36 is required, which is indicated by double arrows as a difference between are represented by the lever spring force and the pad spring force.
- the lever spring characteristic 267 has a maximum and a minimum, both of which are in the range of a positive spring force.
- the force-displacement diagram (FIG. 4) shows the characteristic of a lever spring which is arranged in the form of a snap spring in a friction clutch.
- a fully engaged, closed clutch has an apply force 32 of approximately 8000 Newton (N) at an engagement travel of approximately 9 millimeters (mm).
- the engagement force 30, which is needed to open the clutch is about 1900 N. With increasing opening, a reduction of the engagement, the required engagement force 30 decreases to a region-wise substantially constant value of less than 1000 N, wherein the contact pressure 32 also decreases , and at about 3.5 mm engagement travel drops to zero.
- the snap spring the required engagement force can be lowered, the theoretical efficiency is about 76%.
- FIGS. 5 to 7 the characteristic of a lever spring, which is designed in the form of a plate spring, is shown.
- the lever spring has a constant thickness s, for example of 1, 5 mm, and a constant width of force, for example, with an outer diameter of 200 mm and an inner diameter of 160 mm on.
- the altitude h 0 , or the slope were each varied.
- the lever spring can be designed as a snap spring.
- the characteristic of the lever spring has a pronounced maximum in the range of the negative travel and a pronounced minimum in the range of the positive travel.
- the minimum of the characteristic is also in the negative spring force range, whereby the lever spring has a snap spring characteristic, the region-wise reversal of the spring force.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112012002617.9T DE112012002617A5 (en) | 2011-06-24 | 2012-06-16 | lever spring |
CN201280031215.9A CN103620250B (en) | 2011-06-24 | 2012-06-16 | There is the clutch of arm spring |
EP12729002.1A EP2724043A1 (en) | 2011-06-24 | 2012-06-16 | Lever spring |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011105479.4 | 2011-06-24 | ||
DE201110105479 DE102011105479A1 (en) | 2011-06-24 | 2011-06-24 | lever spring |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012175186A1 true WO2012175186A1 (en) | 2012-12-27 |
Family
ID=46331215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2012/002557 WO2012175186A1 (en) | 2011-06-24 | 2012-06-16 | Lever spring |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2724043A1 (en) |
CN (1) | CN103620250B (en) |
DE (2) | DE102011105479A1 (en) |
WO (1) | WO2012175186A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112014004459B4 (en) * | 2013-09-26 | 2020-09-24 | Schaeffler Technologies AG & Co. KG | Lever spring mounted on two sides for push / pull activation with tie rod |
DE102017100036A1 (en) * | 2017-01-03 | 2018-07-05 | Schaeffler Technologies AG & Co. KG | friction clutch |
DE102022119995A1 (en) | 2022-08-09 | 2024-02-15 | Schaeffler Technologies AG & Co. KG | Torque transmission device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19507965A1 (en) * | 1994-03-12 | 1995-09-14 | Luk Lamellen & Kupplungsbau | Friction coupling for vehicle |
DE10316445A1 (en) * | 2002-04-10 | 2003-10-23 | Luk Lamellen & Kupplungsbau | Clutch for motor vehicle transmission has guide pin to selectively engage with clutch housing or pressure plate depending on engagement state |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100326408B1 (en) * | 1992-12-22 | 2002-10-31 | 룩라멜렌운트쿠플룽스바우베타일리궁스카게 | Friction clutch |
GB9518991D0 (en) * | 1995-09-16 | 1995-11-15 | Automotive Products Plc | Automatically adjusting clutch |
US6062365A (en) * | 1999-01-13 | 2000-05-16 | Eaton Corporation | Automatically adjusting friction clutch with over adjustment protection |
CN2460787Y (en) * | 2000-12-13 | 2001-11-21 | 桦霖工业股份有限公司 | Gap adjusting device of wet brake clutch |
CN2699049Y (en) * | 2004-05-19 | 2005-05-11 | 长春一东离合器股份有限公司 | Spring clutch with double diaphragm |
-
2011
- 2011-06-24 DE DE201110105479 patent/DE102011105479A1/en not_active Withdrawn
-
2012
- 2012-06-16 WO PCT/EP2012/002557 patent/WO2012175186A1/en active Application Filing
- 2012-06-16 CN CN201280031215.9A patent/CN103620250B/en not_active Expired - Fee Related
- 2012-06-16 EP EP12729002.1A patent/EP2724043A1/en not_active Withdrawn
- 2012-06-16 DE DE112012002617.9T patent/DE112012002617A5/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19507965A1 (en) * | 1994-03-12 | 1995-09-14 | Luk Lamellen & Kupplungsbau | Friction coupling for vehicle |
DE10316445A1 (en) * | 2002-04-10 | 2003-10-23 | Luk Lamellen & Kupplungsbau | Clutch for motor vehicle transmission has guide pin to selectively engage with clutch housing or pressure plate depending on engagement state |
Also Published As
Publication number | Publication date |
---|---|
EP2724043A1 (en) | 2014-04-30 |
CN103620250A (en) | 2014-03-05 |
DE112012002617A5 (en) | 2014-03-27 |
DE102011105479A1 (en) | 2012-12-27 |
CN103620250B (en) | 2016-10-12 |
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