DE102019217105A1 - Lamella for a lamella switching element - Google Patents

Abstract

The invention relates to a lamella (14) for a lamellar switching element, comprising an annular support body (17) with axial end faces, the support body (17) being provided with a profile. In order to create a lamella (14), the application of which can reduce a drag torque in the open state of the lamellar switching element, the profile is in the form of at least one embossing (22, 23), each of which is axially formed by one opposite one axial end face protruding projection (24; 25) and is formed by a recess (26; 27) which is axially set back with respect to the other axial end face and which overlaps with the one projection (24; 25).

Description

The invention relates to a lamella for a lamellar switching element, comprising an annular support body with axial end faces, the support body being provided with a profile. Furthermore, the invention relates to a multi-leaf switching element with at least one of the aforementioned discs, a transmission and a method for producing a multi-disc.

In the case of transmissions, switchable, non-positive shifting elements are known in which a non-rotatable connection between components of the transmission to be coupled can be established by frictional engagement. Frequently, non-positive switching elements are designed as multi-plate switching elements, in which, in the actuated state, torque is transmitted through frictional engagement between the plates of a plate set. In order to improve the frictional engagement, either the inner disks or the outer disks are often equipped with friction linings on a respective disk-shaped carrier body. Apart from an actuated state, however, it is important that the inner disks and the outer disks of the disk pack are not in contact with one another as far as possible, since this would otherwise result in drag losses and accordingly worsen the efficiency. In addition to spring elements, which are each placed between the outer and inner disks, special designs of the disks are often made in order to bring about an axial pushing apart of the disks in the non-actuated state of the multi-disk switching element.

So is from the DE 10 2015 221 230 A1 a multi-disc switching element is known in which a disc pack is formed by outer discs and inner discs which are arranged alternately in the axial direction. The lamellae each have a disk-shaped carrier body, the respective carrier body in the case of the outer lamellas also being provided with a friction lining on each axial end face. In order to generate axially acting forces in the non-actuated state of the multi-disc switching element, via which the opposing discs are pushed apart, the friction linings of the outer discs and the carrier bodies of the inner discs are provided with profiles in the form of dent-shaped depressions. Air cushions are to be created via these depressions, through which axially acting forces are generated.

Furthermore, the EP 0 790 426 A2 a lamella of a lamellar switching element, with this lamella having a carrier body equipped with sintered friction linings on axial end faces. Profiling in the form of depressions is also made in each of the friction linings and the carrier body, this profiling serving to strengthen the carrier body in order to be able to dispense with additional calibration of the lamella after the friction linings have been sintered.

Starting from the prior art described above, the object of the present invention is to create a lamella for a lamella switching element, with the intention of reducing a drag torque in the open state of the lamella switching element when this lamella is used in a lamella switching element.

This object is achieved on the basis of the preamble of claim 1 in conjunction with its characterizing features. The subsequent dependent claims each reproduce advantageous developments of the invention. A lamellar switching element, which has at least one lamella according to the invention, is also the subject matter of claim 13. Claim 14 also relates to a transmission with at least one lamellar switching element and claim 15 to a method for producing a lamella.

According to the invention, a lamella comprises an annular support body with axial end faces, the support body being provided with a profile. A lamella according to the invention thus has a carrier body which is annular, i.e. has a disk-shaped configuration which is delimited in the radial direction by an outer diameter and an inner diameter. Depending on whether the lamella is to be used as an outer lamella or an inner lamella in a lamella switching element, the carrier body is also preferably equipped with driving teeth on an outer circumference defined by the outer diameter or on an inner circumference defined by the inner diameter. When installed in a multi-disc switching element, this driving toothing is used for the non-rotatable and axially displaceable guidance of the disc in a respective disc carrier. Furthermore, the carrier body of the lamella consists in particular of steel.

In the context of the invention, “axial” means an orientation in the direction of a central axis of the support body of the lamella, around which the support body can be rotated when the lamella is installed. “Radial” means an orientation starting from the central axis in the diameter direction, while “in the circumferential direction” means a course in the direction of a circumference of a circle whose center lies on the central axis.

The invention now includes the technical teaching that the profiling is in the form of at least one embossing, each by one with respect to the one axial end face axially protruding projection and is formed by a recess which is axially set back with respect to the other axial end face and which each overlaps a projection. In other words, the profiling of the carrier body is thus formed by at least one embossing. The at least one embossing is designed in such a way that there is an overlapping axial elevation on one axial end face of the support body and an axial lowering on the other axial end face of the support body.

Such a design of a lamella has the advantage that when the lamella is installed and the lamella switching element is in an unactuated state, there is a small contact area between the lamella and the lamella opposite on this axial side via the one projection of the at least one embossing, which results in open state of the multi-leaf switching element reduces the friction surface contact and thus also a drag torque. At the same time, this also creates an axial intermediate area between the lamella and the opposite lamella, through which lubricant can pass radially. Furthermore, each of the protrusions prevents the lamella from sticking to the axially opposite lamella, which would otherwise occur due to wetting with lubricant. Finally, the wobbling behavior of the lamella is improved.

Overall, a lamella can be realized, when used in a lamella switching element, a drag torque is reduced.

In the context of the invention, an “embossing” is to be understood as a local change in the otherwise planar end faces of the carrier body, this change being produced in particular in the context of a forming process. The at least one embossing can preferably be designed in the shape of a sinusoid or a radius, in particular with a homogeneous transition into the respective axial end face. In the case of the at least one embossing, the respective protrusion and the respective recess overlap, which means that the respective protrusion and the respective recess at least overlap one another in the circumferential direction and in the radial direction. Furthermore, the respective protrusion and the respective depression of the at least one embossing have in their courses in particular a course that is essentially parallel to one another.

With the lamella of the DE 10 2015 221 230 A1 a drag torque should also be reduced by axially pushing the slats apart via air cushions. However, sticking can occur in particular when wetted with lubricant. The same problem also exists with a lamella of the EP 0 790 426 A2 .

According to one embodiment of the invention, several embossings distributed in the circumferential direction are provided. Advantageously, by providing several embossings, each of which extends over part of the circumference of the carrier body, minimal contact with a respective, axially opposite lamella can be achieved over the circumference with low manufacturing costs. In the circumferential direction between the projections of the embossments, intermediate spaces are also defined, through which the lubricant can easily flow radially past the lamella. The axially protruding projections and the axially recessed depressions preferably each have a maximum axial extent in the range from 0.05 to 0.3 mm, for example 0.15 ± 0.1 or 0.2 ± 0.1 mm.

In a further development of the aforementioned embodiment, at least one opening in each case is formed in the carrier body radially adjacent to the individual embossing. This has the advantage that lubricant can reach the level of the individual embossing via the opening from one axial side of the lamella to the other axial side. This enables lubricant to flow past in the circumferential direction even at the level of the embossments. This reduces the fluid permeability of the lamella in the contact area, which has a positive influence on the drag torque. The respective opening preferably runs in the circumferential direction at least over the complete extent of the respective embossing and is more preferably in the form of a slot. In particular, a radial dimension of a slot corresponds to at least the axial thickness of the carrier body, the radial dimension particularly preferably being 2 to 2.5 times the axial thickness of the carrier body, for example 1.5 to 2 mm.

As an alternative or in addition to the development described above, the embossments are distributed over at least one common diameter of the carrier body in the circumferential direction. Several of the embossments are located radially at the same height, with all embossments being able to be placed on one diameter, that is to say lie at a radial height and follow one another in the circumferential direction. In this way, the embossings can advantageously be arranged in a narrow radial area. In the context of the invention, however, it is also conceivable that there are several diameters on each of which several embossings are distributed in the circumferential direction. In particular, embossings are then provided in the circumferential direction at the same height, in that embossings are radially one above the other.

As an alternative or in addition, the embossings are distributed equidistant from one another in the circumferential direction. This has the advantage that it helps in the open state of the lamellar switching element over the circumference through the multiple punctual contacts with the axially opposite lamella can realize a uniform axial distance to this lamella. This reliably prevents a flat contact with the axially opposite lamella over the circumference of the lamella. An increment angle of the embossing can correspond to an increment angle of a driving toothing or differ from this, in that the incremental angle of the embossing preferably corresponds to a multiple of the incremental angle of the driving toothing.

According to a further embodiment, which is an alternative or a supplement to the aforementioned variants, the embossings are oriented differently with their respective protrusions in the direction of one or the other axial end face. Accordingly, axially protruding projections are defined on both axial sides of the carrier body, so that punctual contacts can be formed with lamellae lying axially on both sides. This makes the lamella suitable for use in an axial area in which the lamella is placed axially between two other lamellae. The embossings are particularly preferably oriented alternately with their respective protrusions in the direction of one or the other axial end face. If several embossings are arranged at the same height in the circumferential direction and on different diameters, i.e. radially one above the other, it is conceivable that the projection of one embossing is oriented in one axial direction and the projection of the other embossing is oriented in the other axial direction.

According to an alternative embodiment of the invention, the at least one embossing is formed circumferentially. This has the advantage that a small contact area with an axially opposite lamella is formed axially on the side of the projection of the at least one circumferential embossing, which results in a low friction surface contact and thus also entails a low drag torque. At the same time, due to the circumferential projection, there is a geometrical as well as a hydrodynamic separation effect on the axially opposite lamella here, since lubricant is practically forced into a lubricating wedge in the area of a maximum axial extension of the projection. On the other hand, on the axial side of the circumferential recess, an axial end face is reduced and an intermediate space is created for the flow of lubricant. The at least one circumferential projection is preferably designed to be convex. More preferably, the at least one circumferential depression runs essentially parallel to the at least one projection.

For the purposes of the invention, several circumferential embossments can be provided at different radial heights on the carrier body. In particular, however, only a circumferential embossing is designed. The at least one axially protruding projection and / or the at least one axially recessed recess preferably each have a maximum axial extension in the range from 0.1 to 0.4 mm, for example 0.2 ± 0.1 or 0.3 ± 0 ,1 mm.

In a further development of the aforementioned design option, a plurality of openings distributed in the circumferential direction are made in the carrier body radially at the level of the at least one embossing. Advantageously, lubricant can pass through these openings from one axial side to the other axial side, which simplifies the radial flow of the lubricant past the lamella. In particular, the openings each have a circular or oval cross section, a diameter of an opening in the case of a circular cross section preferably corresponding to at least the axial thickness of the carrier body. However, the diameter is particularly preferably 2.5 to 3 times the axial thickness of the carrier body, for example 2 to 2.5 mm. In particular, the openings are equidistant from one another in the circumferential direction, an increment angle of the openings here corresponding to an increment angle of a driving toothing of the lamella or being a multiple of this increment angle.

In a further development, the openings lie in the circumferential direction alternately radially inside and radially outside of an axially maximum extent of the at least one embossing. This improves the radial fluid permeability, since lubricant can flow past the lamella almost unhindered using the openings.

In a further development of one of the aforementioned variants, the at least one embossing is each designed to be resilient. Advantageously, when the associated switching element is actuated and the lamellae of the lamella set are axially pressed against one another as a result, the at least one embossing of the lamella according to the invention can be at least as flat as possible. As a result, a flat contact and thus the largest possible friction surface contact can be formed with the lamella axially opposite there in each case. If the actuation of the lamellar switching element is then terminated, the resiliently resilient embossing causes the lamella according to the invention to be axially pushed off the axially opposite lamella by springing back, whereby the contact is reduced again and thus the drag torque is also reduced.

A spring rate curve of the at least one embossing is furthermore preferably divided into two, in that a lower spring rate is effective after the respective projection is essentially flush with the respective axial end face. This has the advantage that, in the actuated state of the multi-leaf switching element, an axial holding force for the actuation of the multi-leaf switching element can be reduced. Because as soon as there has been a flat shift and thus a certain spring travel has been overcome, the lamellar switching element can be held in the actuated state with a lower force. In addition, this enables a more homogeneous distribution of pressure and more uniform wear behavior.

According to a further possible embodiment of the invention, a friction lining is applied to the carrier body on at least one of the axial end faces. Friction linings are preferably provided on both axial end faces in order to also be able to form frictional contact on both sides with lamellae that are axially opposite there. The individual friction lining can be in the form of a closed ring with any embossed groove or it can be formed by several pads which are then applied to the carrier body in such a way that corresponding grooves are defined between the pads. It is further preferred that the respective one friction lining is applied radially at the level of the at least one embossing on the carrier body, the friction lining following the respective projection or the respective depression in areas of overlap with the at least one embossing. Furthermore, it is conceivable within the scope of the invention to have the friction lining covered radially by 60 to 80% or 60 to 90% with the at least one embossing. Alternatively, no friction lining can be provided on the lamella.

The invention also relates to a lamella switching element which has at least one lamella designed according to one or more of the aforementioned variants. Specifically, this multi-disc switching element can be in the form of a multi-disc clutch or a multi-disc brake. In this case, all of the inner disks and / or all of the outer disks are preferably designed in the manner according to the invention.

The invention also relates to a transmission, which can be a motor vehicle transmission. In this case, one or more multi-disc switching elements with discs according to the invention are provided in the transmission.

In a method according to the invention for producing a lamella, at least the process steps are run through that first an annular support body with axial end faces is produced and then a profile is introduced into the support body in the form of at least one embossing, the at least one embossing each by one opposite the an axial end face axially protruding protrusion and is formed by a recess which is axially set back with respect to the other axial end face and which covers one protrusion. This takes place in particular as part of a forming process. Then the carrier body is subjected to an axial contact pressure, so that the at least one embossing is in each case pressed essentially flat with the axial end faces. A friction lining is then applied to at least one of the axial end faces and the carrier body is then relieved. Specifically, the lamella is designed according to one or more of the variants described in advance.

The invention is not restricted to the specified combination of the features of the independent claims or of the claims which are dependent on them. In addition, there are possibilities of combining individual features with one another, also insofar as they emerge from the claims, the following description of preferred embodiments of the invention or directly from the drawings. The reference of the claims to the drawings through the use of reference signs is not intended to limit the scope of protection of the claims.

• 1 eine Schnittansicht eines Teils eines Getriebes im Bereich eines Lamellenschaltelements, welches entsprechend einer ersten Ausführungsform der Erfindung gestaltet ist;
• 2 eine Detailansicht des Lamellenschaltelements aus 1;
• 3 eine Einzelansicht einer gemäß einer ersten Ausgestaltungsmöglichkeit der Erfindung ausgeführten Lamelle des Lamellenschaltelements aus 1;
• 4 eine Schnittansicht der Lamelle aus 3;
• 5 eine perspektivische Ansicht eines Teils der Lamelle aus 3;
• 6 eine Schnittansicht eines Teils eines Getriebes im Bereich eines Lamellenschaltelements, das gemäß einer zweiten Ausgestaltungsmöglichkeit der Erfindung ausgeführt ist;
• 7 eine Detailansicht des Lamellenschaltelements aus 6;
• 8 eine Einzelansicht einer gemäß einer zweiten Ausführungsform der Erfindung ausgeführten Lamelle des Lamellenschaltelements aus 6;
• 9 eine erste Schnittansicht der Lamelle aus 8;
• 10 eine zweite Schnittansicht der Lamelle aus 8; und
• 11 eine perspektivische Ansicht eines Teils der Lamelle aus 8.

Advantageous embodiments of the invention, which are explained below, are shown in the drawings. It shows:

• 1 a sectional view of part of a transmission in the area of a multi-leaf switching element, which is designed according to a first embodiment of the invention;
• 2 a detailed view of the lamellar switching element 1 ;
• 3 a detailed view of a slat of the slat switching element designed according to a first embodiment of the invention 1 ;
• 4th a sectional view of the lamella from 3 ;
• 5 a perspective view of part of the lamella from FIG 3 ;
• 6th a sectional view of part of a transmission in the area of a multi-leaf switching element, which is designed according to a second embodiment of the invention;
• 7th a detailed view of the lamellar switching element 6th ;
• 8th a detailed view of a according to a second embodiment of the invention executed lamella of the lamellar switching element 6th ;
• 9 a first sectional view of the lamella from 8th ;
• 10 a second sectional view of the lamella 8th ; and
• 11 a perspective view of part of the lamella from FIG 8th .

1 Figure 11 shows a sectional view of a portion of a transmission 1 , which is in particular a motor vehicle transmission. Here is the transmission 1 in the area of a lamella switching element 2 shown, which is designed according to a first embodiment of the invention and is in particular as a multi-plate clutch. The lamellar switching element 2 comprises an outer disk carrier 3 and an inner disc carrier 4th , each with - not further illustrated here - components of the transmission 1 are connected via the lamellar switching element 2 are to be connected non-rotatably with each other. The outer disc carrier 3 and the inner disc carrier 4th take a disk pack radially between them 5 on.

The lamellar switching element 2 is a hydraulic actuator 6th assigned to an actuating piston 7th includes. This actuating piston 7th can thereby by pressurizing an actuating space 8th from an in 1 shown basic position against a spring element 9 are moved axially into an actuating position in which the actuating piston 7th the disk pack 5 of the lamellar switching element is applied with an axial force. This creates a frictional connection between the outer disk carrier 3 and the inner disc carrier 4th formed and made a rotationally fixed connection. The lamellar switching element 2 is then in a closed state.

In 2 is the lamella pack 5 of the lamellar switching element 2 shown in more detail. As can be seen here, are in the outer disk carrier 3 several slats 10 axially displaceable and rotationally fixed as outer lamellae by the individual lamella 10 on a respective outer circumference via driving teeth 11 with which the single lamella 10 in a corresponding drive toothing 12th of the outer disk carrier 3 running. Axially between two slats 10 is also each a spring element in the form of a corrugated spring 13th provided over the slats 10 in the unactuated state of the lamellar switching element 2 be pushed apart axially.

Next to the slats 10 of the outer disk carrier 3 becomes the plate pack 5 still through slats 14th of the inner disc carrier 4th formed, the slats 14th with the slats 10 are arranged alternately in the axial direction. The slats 14th of the inner disc carrier 4th are each axially displaceable and non-rotatably in the inner disc carrier 4th led to what the individual lamella 14th one driving toothing on each inner circumference 15th has, with which the single lamella 14th in a corresponding drive toothing 16 of the inner disc carrier 4th running. The slats 14th of the inner disc carrier 4th are designed according to a first possible embodiment of the invention, which will now be implemented in the following with the aid of the further 3 to 5 should be described.

As in 3 can be seen, comprises the individual lamella 14th an annular support body 17th , which consists of steel and also the driving teeth on an inner diameter 15th forms. On axial end faces 18th and 19th which of the individual slats 14th one lamella each 10 of the outer disk carrier is opposite, is on the carrier body 17th also a friction lining each 20th or. 21st upset. The friction linings 20th and 21st are in each case present as closed rings, in each of which a groove is embossed - not further illustrated here. The driving gearing 15th is interrupted in the circumferential direction by the omission of individual teeth in order to ensure that the friction linings are applied in a directed manner 20th and 21st to facilitate.

The carrier body is a special feature 17th provided with a profile that is created by several embossings 22nd and 23 is formed. The imprints 22nd all lie on a first diameter of the carrier body 17th and are arranged equidistant from one another in the circumferential direction. The same is also true for the embossing 23 arranged equidistantly from one another in the circumferential direction and on a second diameter of the carrier body 17th provided, the second diameter being smaller than the first diameter. There is an embossing in each case in the circumferential direction 23 at the height of one embossing 22nd provided, with the respective embossing 23 radially inside to the respective embossing 22nd is trained. The individual coinage 22nd or. 23 is designed in such a way that - as in particular in 4th can be seen - on one axial face 18th or. 19th of the carrier body 17th a head start each 24 or. 25th and in the same position on the other axial end face 19th or. 18th one deepening each 26th or. 27 is defined. There are with the embossing 22nd the protrusions 24 in the direction of the axial face 19th and with the embossing 23 the protrusions 25th in the direction of the axial face 18th oriented so that the radially superimposed embossings 22nd and 23 are oriented differently.

Radially adjacent to the respective embossing 22nd or. 23 is also a breakthrough 28 or. 29 in the carrier body 17th and also the friction linings 20th and 21st formed, wherein the respective opening is present as a slot running in the circumferential direction, which extends in the circumferential direction over the length of the respective embossing 22nd or. 23 extends.

As in 3 can be seen, is an increment angle 30th under which the embossing 22nd and 23 follow one another, a multiple of an incremental angle 31 the driving gearing 15th . In addition, the imprints are 22nd and 23 each with an axial height 32 or. 33 executed from 0.05 to 0.3 mm, ie the projections 24 and 25th are in an unloaded state of the lamella 14th with this axial height 32 or. 33 opposite the respective face 18th or. 19th in front. The embossings overlap radially 22nd and 23 complete with the friction linings 20th and 21st , with radial dimensions 34 and 35 of the imprints 22nd and 23 together here 60 to 80% of a covering width 36 the friction linings 20th and 21st corresponds to.

The protrusions 24 or. 25th and the wells 26th or. 27 of the imprints 22nd or. 23 are each sinusoidal and each have a homogeneous transition into the respective end face 18th or. 19th on. Furthermore, the breakthroughs 28 and 29 each with a radial width 37 executed having at least one axial thickness 38 of the carrier body 17th corresponds to, but preferably 2 to 2.5 times the axial thickness 38 amounts to.

Due to the overlap and the connection with the carrier body 17th take the friction linings 20th and 21st at the level of the embossing 22nd and 23 also the courses of the projections 24 or. 25th and the depressions 26th or. 27 at. Because of the axially mutually oriented projections 24 and 25th arise when the lamellar switching element is not actuated 2 on the projections 24 and 25th selective contacts of the individual lamella 14th with the lamellae lying axially on both sides 10 of the outer disk carrier 3 a. As a result, the friction surface contact is correspondingly reduced, so that in the unactuated state of the multi-leaf switching element 2 results in a lower drag torque. In addition, lubricant can use the breakthroughs 28 and 29 radially outwards almost unhindered, as shown in 2 with the arrow 37 is indicated. In addition, the tumbling behavior of the individual lamellae 14th positively influenced.

The imprints 22nd and 23 are each designed to be resilient in the axial direction. This has when the lamellar switching element is actuated 2 via the actuation device 6th result in the imprints 22nd and 23 in the course of the axial pressing of the lamellas 10 and 14th via the actuating piston 7th essentially flat with the end faces 18th and 19th be pressed so that at the individual lamella 14th if possible over the entire surface of the respective friction lining 20th or. 21st effective surface contact with the respective opposite lamella 10 adjusts. As a result, the greatest possible friction surface contact is formed. The imprints 22nd and 23 are dimensioned in terms of their geometry in such a way that a two-part spring rate curve occurs for the individual embossing 22nd or. 23 adjusts. So a higher spring rate is effective up to the face turning, that after the face turning of the respective embossing 22nd or. 23 goes into a lower spring rate. This is about the actuator 6th to apply a lower axial holding force to the multi-leaf switching element 2 to keep in the closed state.

Is the actuation of the lamellar switching element 2 finished, so are the slats 10 of the outer disk carrier 3 about the wave springs 13th axially pushed apart. A springback of the embossing 22nd and 23 also ensures that the individual slats 14th from the slats 10 are pushed away axially so that the individual lamellae adhere 14th on one of the slats 10 is prevented. The extensions in the circumferential direction and the number of embossments 22nd and 23 are to be selected in such a way that an axial return force is sufficiently large.

A production of the single lamella 14th is implemented according to the invention in particular as follows: First, the annular carrier body 17th with the axial end faces 18th and 19th and the driving teeth 15th manufactured. Then the embossing 22nd and 23 and the breakthroughs 28 and 29 in the carrier body 17th introduced, the carrier body 17th is then applied with an axial contact pressure, so that the embossing 22nd and 23 each essentially flat with the axial end faces 18th and 19th be pressed. This is followed by the friction linings 20th and 21st on the front sides 18th and 19th applied, in particular glued, before the carrier body 17th relieved again and with it the embossing, now together with the friction linings 18th and 19th , spring back.

6th Figure 11 shows a sectional view of a portion of a transmission 1 , in which a lamellar switching element 40 according to a second possible embodiment of the invention is used. The lamellar switching element 40 which is in 7th is shown in more detail, corresponds essentially to the first embodiment according to the 1 and 2 , with the difference that with a plate pack 41 now inner disks of the inner disk carrier 4th as slats 42 are present, which are designed according to a second embodiment of the invention and of which in the 8th to 11 a single lamella 42 is shown in more detail. The gear 1 and also the lamellar switching element 40 otherwise correspond to the 1 and 2 Described, so that reference is hereby made.

The single lamella 42 comprises an annular support body 43 , which is particularly in 8th can be seen and a driving toothing on an inner circumference 44 forms over which the single lamella 42 non-rotatable and axially displaceable in the driving teeth 16 of the inner disc carrier 4th is led. The carrier body 43 consists of steel and has axial end faces 45 and 46 which of the individual slats 42 in the lamellar switching element 40 one lamella each 10 of the outer disk carrier are opposite. On the axial end faces 45 and 46 are also friction linings 47 and 48 applied, which are each present as closed rings and in each of which - not shown further here - a groove is embossed. As in 8th can be seen is the driving toothing 44 interrupted in the circumferential direction by the omission of individual teeth, in order to ensure that the friction linings are applied in a directed manner 47 and 48 to facilitate.

The carrier body 43 has a profile in the form of a circumferential embossing 49 is present. As in particular in 9 can be seen is the embossing 49 executed so that on one axial end face 45 of the carrier body 43 a bulbous ledge 50 and radially at the same height on the other axial end face 46 a depression 51 results. In this respect, the embossing points 49 has a bead-like shape, the protrusion 50 and the indentations are substantially parallel to one another. Here is the embossing 49 in the present case with an axial height 52 executed from 0.1 to 0.4 mm, ie the projection 50 stands in an unloaded state of the lamella 42 with this axial height 52 opposite the front 45 in front. Radially covers the embossing 49 complete with the friction linings 47 and 48 , being a radial dimension 53 the embossing 49 in this case 60 to 90% of a respective covering width 54 the friction linings 47 and 48 corresponds to. The lead 50 and the depression 51 the embossing 49 are each sinusoidal and each have a homogeneous transition into the respective end face 45 or. 46 on.

Especially in 8th it can also be seen that the carrier body 43 and also the friction linings 47 and 48 with multiple breakthroughs 55 are interspersed, which are each designed with a circular cross-section. The openings are arranged one after the other equidistantly in the circumferential direction, the openings 55 radial at the level of the embossing 49 lie and thereby alternating radially inwardly and radially outwardly to a maximum axial extent of the projection 50 are placed. An incremental angle 56 under which the breakthroughs 55 follow one another, corresponds to an incremental angle 57 the driving gearing 44 . Furthermore, the breakthroughs 55 each with a diameter 58 executed at least one axial thickness 59 of the carrier body 43 corresponds, but preferably 2.5 to 3 times the axial thickness 59 amounts to.

Due to the overlap and the connection with the carrier body 43 take the friction linings 47 and 48 at the height of the embossing 49 also the course of the projection 50 or the deepening 51 at. On the part of the lead 50 arises when the lamellar switching element is not actuated 40 a linear contact of the individual lamellae 42 with the lamella located axially there 10 of the outer disk carrier 3 a. As a result, the friction surface contact is correspondingly reduced, so that in the unactuated state of the multi-leaf switching element 40 results in a lower drag torque. In addition, lubricant can use the breakthroughs 55 radially outwards almost unhindered, as shown in 10 with the arrow 60 is indicated.

Furthermore, the embossing 49 designed to be elastically resilient in the axial direction. This has when the lamellar switching element is actuated 40 via the actuation device 6th result in the embossing 49 of the individual lamella 42 when axially pressing the lamellae together 10 and 42 via the actuating piston 7th essentially flat with the end faces 45 and 46 is pressed so that the individual lamella 42 if possible over the entire surface of the respective friction lining 47 and 48 effective surface contact with the respective opposite lamella 10 adjusts. As a result, the greatest possible friction surface contact is formed. A geometry of embossing 49 is chosen so that there is a two-part spring rate curve. So a higher spring rate is effective up to the face turning, that after the face turning the embossing 49 goes into a lower spring rate. As a result, a lower axial holding force is necessary in order to move the multi-leaf switching element 40 to keep in the closed state.

At the end of the actuation of the lamellar switching element 40 become the slats 10 of the outer disk carrier 3 about the wave springs 13th axially pushed apart. A springback of the embossing 49 also ensures that the individual lamella 42 of each axially on the side of the projection 50 lying slat 10 is pressed axially so that the individual lamellae adhere 42 on this lamella 10 is prevented. The geometry of the embossing 49 is to be selected so that an axial resilience is sufficiently large.

When producing the individual lamella according to the invention 42 In particular, the following procedural steps are carried out: At the beginning becomes the ring-shaped support body 43 manufactured and also the axial end faces 45 and 46 and the driving teeth 44 educated. Then the embossing 49 in the carrier body 43 introduced and thereby the projection 50 and the depression 51 formed, this being done in particular in a deforming manner. In addition, the breakthroughs 55 intended. Then the carrier body 43 applied with an axial contact pressure, so that the embossing 49 essentially flat with the axial end faces 45 and 46 is pressed. This is followed by the friction linings 47 and 48 on the front sides 45 and 46 applied, in particular glued, before the carrier body 43 is relieved again. As a result, the embossing springs 49 , now together with the friction linings 47 and 48 , back.

By means of the embodiments according to the invention of a lamella for a lamellar switching element, a drag torque of the lamellar switching element in its open state can be reduced.

List of reference symbols

1

transmission

2

Lamella switching element

3

Outer disc carrier

4th

Inner disc carrier

5

Disc pack

6th

Actuator

7th

Actuating piston

8th

Operating room

9

Spring element

10

Lamella

11

Driving gearing

12th

Driving gearing

13th

Wave spring

14th

Lamella

15th

Driving gearing

16

Driving gearing

17th

Carrier body

18th

Front side

19th

Front side

20th

Friction lining

21

Friction lining

22nd

Embossing

23

Embossing

24

head Start

25th

head Start

26th

deepening

27

deepening

28

breakthrough

29

breakthrough

30th

Increment angle

31

Increment angle

32

axial height

33

axial height

34

dimension

35

dimension

36

Covering width

37

width

38

thickness

39

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40

Lamella switching element

41

Disc pack

42

Lamella

43

Carrier body

44

Driving gearing

45

Front side

46

Front side

47

Friction lining

48

Friction lining

49

Embossing

50

head Start

51

deepening

52

axial height

53

dimension

54

Covering width

55

breakthrough

56

Increment angle

57

Increment angle

58

diameter

59

thickness

60

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QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 102015221230 A1 [0003, 0013]
• EP 0790426 A2 [0004, 0013]

Claims (15)

Lamella (14; 42) for a lamellar switching element (2; 40), comprising an annular carrier body (17; 43) with axial end faces (18, 19; 45, 46), the carrier body (17; 43) being provided with a profile , characterized in that the profiling is in the form of at least one embossing (22, 23; 49), each of which is formed by a projection (24; 25; 50) protruding axially with respect to the one axial end face (18; 19; 45) and by a recess (26; 27; 51) is formed which is axially set back with respect to the other axial end face (19; 18; 46) and which overlaps a projection (24; 25; 50). Lamella (14) Claim 1 , characterized in that several embossings (22, 23) distributed in the circumferential direction are provided. Lamella (14) Claim 2 , characterized in that at least one opening (28, 29) is formed in the carrier body (17) radially adjacent to the individual embossing (22, 23). Lamella (14) Claim 2 or 3 , characterized in that the embossments (22, 23) are distributed in the circumferential direction on at least one common diameter of the carrier body (17). Lamella (14) according to one of the Claims 2 to 4th , characterized in that the embossments (22; 23) are equidistant from one another in the circumferential direction. Lamella (14) according to one of the Claims 2 to 5 , characterized in that the embossments (22, 23) are oriented differently with their respective protrusions (24, 25) in the direction of one (18) or the other axial end face (19). Lamella (42) after Claim 1 , characterized in that the at least one embossing (49) is formed circumferentially. Lamella (42) after Claim 7 , characterized in that a plurality of openings (55) distributed in the circumferential direction are made in the carrier body (43) radially at the level of the at least one embossing (49). Lamella (42) after Claim 8 , characterized in that the openings (55) lie in the circumferential direction alternately radially inside and radially outside of an axially maximum extent of the respective projection (50) of the at least one embossing (49). Lamella (14; 42) according to one of the preceding claims, characterized in that the at least one embossing (22, 23; 49) is each designed to be elastically resilient. Lamella (14; 42) after Claim 10 , characterized in that a spring rate curve of the at least one embossing (22, 23; 49) is divided into two parts, after a substantially flat pressing of the respective projection (24; 25; 50) with the respective axial end face (18; 19; 45) lower spring rate is effective. Lamella (14; 42) according to one of the preceding claims, characterized in that a friction lining (20, 21; 47, 48) is placed on each of the carrier bodies (17; 43) on at least one of the axial end faces (18, 19; 45, 46) ) is applied. Lamella shift element (2; 40) for a transmission (1), comprising at least one lamella (14; 42) according to one or more of the Claims 1 to 12th . Transmission (1), in particular a motor vehicle transmission, comprising at least one multi-leaf switching element (2; 40) according to Claim 13 . A method for producing a lamella (14; 42), comprising the following method steps: - Production of an annular carrier body (17; 43) with axial end faces (18, 19; 45, 46), - Introduction of a profile in the support body (17; 43) in the form of at least one embossing (22, 23; 49), each of which is formed by a projection (24; 25; 50) and is formed by a recess (26; 27; 51) which is axially set back with respect to the other axial end face (19; 18; 46) and which overlaps one projection (24; 25; 50), - applying an axial contact pressure to the carrier body (17; 43) so that the at least one embossing (22, 23; 49) is pressed essentially flat with the axial end faces (18, 19; 45, 46), - applying a friction lining (20, 21; 47, 48) to at least one of the axial end faces (18, 19; 45, 46), - Relief of the carrier body (17; 43).

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