DE102014218398A1 - Disc spring with centrifugal tongues - Google Patents

Abstract

The invention relates to a plate spring for a clutch of a motor vehicle, wherein at the edge of the plate spring at least one centrifugal tongue to provide a force acting on the plate spring rotational speed-dependent compensation force is present, wherein the centrifugal tongue surrounds the edge of the plate spring.

Description

The invention relates to a plate spring for a clutch of a motor vehicle, wherein at the edge of the plate spring at least one centrifugal tongue is provided to provide a force acting on the plate spring rotational speed-dependent compensation force.

Such elements are already out of the EP 1 387 104 A2 known. There is a friction clutch, in particular for motor vehicles, comprising a fixed to the flywheel of an internal combustion engine clutch housing known. A rotatably with the clutch housing, but axially displaceable pressure plate is presented there, one between a flywheel and a pressure plate rotatably mounted on a transmission shaft clutch disc, a plate spring for applying the friction linings of the clutch disc on the pressure plate and arranged in the outer edge region of the plate spring at least one mass element is.

From an earlier application of the applicant, a clutch for a drive train of a motor vehicle is known, comprising a clutch plate, an axially displaceable pressure plate and a diaphragm spring for producing a frictional connection between a flywheel of an internal combustion engine and the clutch plate, wherein at a force edge of the diaphragm spring at least one by a spring-biased mass is arranged and wherein the at least one mass is displaceable in a radial direction against the spring bias under the influence of centrifugal force. The force border is also called edge.

Diaphragm spring clutches with flyweights are also from the DE 43 42 361 known. This is a special form of couplings.

In the DE 10 2011 086 085 A1 Furthermore, a self-adjusting coupling is disclosed. There is a friction clutch, comprising a clutch housing and a pressure plate, which is axially displaceable relative to the clutch housing by means of a lever spring, vorgesellt, wherein between the lever spring and the pressure plate, a ramp ring is arranged, which forms a ramp device with the pressure plate, which upon rotation of the Rampenringes circumferentially relative to the pressure plate changes the axial distance of a contact region between the pressure plate and the lever spring, wherein the relative rotation of the ramp ring is effected by means of a spindle device which is driven by a pinion, which cooperates with a cover-firm driving pawl, wherein the engagement between the Drive pawl and the pinion speed-dependent automatically solved.

The relevant for disc springs components and geometric arrangements of said older documents should be considered integrated here.

Unfortunately, in solutions of the prior art, the disengagement force of the clutch and the centrifugal force changes as a function of the rotational speed. Due to a characteristic change of the plate spring, going back to the action of the speed, the Ausrückkraftminimum is significantly reduced. This can in some circumstances lead to pedal hangers or other drawbacks.

It is the object of the present invention to eliminate the disadvantages of the prior art and in particular to minimize the dependence of the release force on the rotational speed, or at least to keep the Ausrückkraftminimum as constant as possible.

This object is achieved according to the invention in a generic disc spring in that the centrifugal force tongue engages around the edge of the plate spring. In this way, a particularly inexpensive and easy to produce Belleville spring copy is possible.

A diaphragm spring is thus provided on the outer diameter with centrifugal force tongues. The centrifugal force tongues on the plate spring exert an additional moment on the plate spring as the speed increases. This moment counteracts the moment as it builds the diaphragm spring, so that the release force remains almost constant.

This effect can be controlled by the length, height and number of centrifugal tongues. In addition, it would also be conceivable to mount additional weights in the centrifugal force tongues, such as rivets, in order to increase the mass and thus the effect. Ultimately, the Ausrückkraftminimum is kept constant in a solution according to the invention in all cases.

The principle can be applied to all clutch pressure plates with disc springs. A constant despite speed change characteristic, especially at high speed components is achieved. There are cost advantages, especially in terms of additional function, obtained without additional components.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

Thus, it is advantageous if the centrifugal force tongue is designed as a supplementary mass-producing sheet metal component.

It is also advantageous if the centrifugal force tongue is formed as a one-piece, approximately integral component. The centrifugal force tongues or several centrifugal force tongues could themselves be configured in one piece or, alternatively, also formed in one piece with the plate spring and / or produced by punching and forming technology.

It is advantageous if the diaphragm spring on one side has a recess in which engages a portion of the centrifugal force tongue, and on the other side has a projection which engages in a recess of the centrifugal force tongue.

It is expedient if a force and / or form fit is present between the centrifugal force tongue and the diaphragm spring.

An excellent embodiment is also characterized in that a plurality of centrifugal force tongues are evenly distributed over the circumference, about 3, 4, 5, 6, 7, 8, 9 or more centrifugal tongues are used.

Be particularly advantageous if the centrifugal force tongue engages in a bead of the plate spring. The assembly can then be simplified.

The costs of production are particularly low if the centrifugal tongue is designed as a thermoforming or forming part.

It is advantageous if the centrifugal force tongue has a crimping section, against which two sections of the centrifugal force tongue lie directly against each other.

If the centrifugal tongue is clicked or clipped into the bead, the assembly is simplified.

The invention also relates to a friction clutch / friction clutch with a plate spring according to the invention. A clutch with such a diaphragm spring is particularly suitable for high-speed internal combustion engines to minimize the changes in the Ausrückkraftkennlinie at high speeds. The coupling can also be designed as a double clutch.

The invention will be explained in more detail with the aid of a drawing, wherein a first embodiment is shown. Show it:

1 a perspective view of a plate spring with six located thereon Federfederfliehkraftzungen, and

2 a longitudinal section through a plate spring with attached centrifugal tongue.

The figures are merely schematic in nature and are only for the understanding of the invention. The same elements are provided with the same reference numerals.

In 1 is a disc spring according to the invention 1 with a force margin / edge 2 , a central opening 3 and radially inwardly projecting spring tongues 4 shown. On the force edge / edge 2 or an inner edge may act on an actuating unit, such as an actuator, or act on a reaction element, such as a pressure plate.

At the edge of force / edge 2 are six equally distributed centrifugal force tongues / diaphragm spring centrifugal tongues 5 attached.

The centrifugal tongues 5 have an investment area 6 on, from which transversely / angularly, approximately orthogonally projecting, a beading portion extends away. The beading section has the reference numeral 7 and is characterized in particular in that there / there two sections of the centrifugal tongue 5 lie directly and flat against each other.

The diaphragm spring has a bead 8th on, which interrupted the force near the outside of the plate spring 1 is trained. The bead 8th is circumferential or isolated at the edge of the force 2 appropriate. Preferably, it is slightly longer than the centrifugal tongue 5 , seen in the circumferential direction.

Ultimately, the bead forms 8th a depression 9 and a lead 10 out, like in 2 easy to recognize. There is the centrifugal tongue 5 positively and / or positively fastened, for example, clicked on, crimped or pressed.

LIST OF REFERENCE NUMBERS

1

 Belleville spring

2

 Force boundary / border

3

 central opening

4

 spring tongue

5

 centrifugal tongue

6

 plant area

7

 Umbördelabschnitt

8th

 Beading

9

 deepening

10

 head Start

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1387104 A2 [0002]
• DE 4342361 [0004]
• DE 102011086085 A1 [0005]

Claims (10)

Disc spring ( 1 ) for a clutch of a motor vehicle, wherein at the edge ( 2 ) the diaphragm spring ( 1 ) at least one centrifugal force tongue ( 5 ) to provide one on the plate spring ( 1 ) acting rotational speed-dependent compensation force is present, characterized in that the centrifugal force tongue ( 5 ) the edge ( 2 ) the diaphragm spring ( 1 ) surrounds. Disc spring ( 1 ) according to claim 1, characterized in that the centrifugal force tongue ( 5 ) is formed as an additional mass-producing sheet metal component. Disc spring ( 1 ) according to claim 1 or 2, characterized in that the centrifugal force tongue ( 5 ) is formed as a one-piece component. Disc spring ( 1 ) according to one of claims 1 to 3, characterized in that the plate spring ( 1 ) on the one side a depression ( 9 ) into which a portion of the centrifugal force tongue ( 5 ) and on the other side a projection ( 10 ), which is in a recess ( 9 ) of the centrifugal force tongue ( 5 ) attacks. Disc spring ( 1 ) according to one of claims 1 to 4, characterized in that between the centrifugal force tongue ( 5 ) and the diaphragm spring ( 1 ) A force and / or positive connection is present. Disc spring ( 1 ) according to one of claims 1 to 5, characterized in that a plurality of centrifugal tongues ( 5 ) over the circumference of the diaphragm spring ( 1 ) is equally distributed. Disc spring ( 1 ) according to one of claims 1 to 6, characterized in that the centrifugal force tongue ( 5 ) in a bead ( 8th ) the diaphragm spring ( 1 ) attacks. Disc spring ( 1 ) according to one of claims 1 to 7, characterized in that the centrifugal force tongue ( 5 ) is designed as a deep-drawn or formed part. Disc spring ( 1 ) according to one of claims 1 to 8, characterized in that the centrifugal force tongue ( 5 ) a beading section ( 7 ), on which two sections of the centrifugal tongue ( 5 ) lie directly against each other. Disc spring ( 1 ) according to one of claims 7 to 9, characterized in that the centrifugal force tongue ( 5 ) in the bead ( 8th ) is clicked or clipped.

Images