DE102013209761A1 - Arrangement for spacing lamellas of e.g. brake of eight gear-planetary automatic transmission in vehicle, has inner and outer lamellas arranged adjacent to each other, where inner or outer lamellas have elastic wave form to space lamellas - Google Patents

Abstract

The arrangement has inner lamellas (3) designed as lining lamellas, and outer lamellas (2) designed as steel lamellas. The inner and outer lamellas are arranged axially adjacent to each other and connected during operation of a lamella switching element. An elastic distance element i.e. ring-shaped corrugated spring (6), is arranged between the inner lamellas or between the outer lamellas and inserted into an outer lamella carrier (4) in a detachable manner. The inner lamellas or outer lamellas comprise an elastic wave form for spacing the adjacent inner and outer lamellas.

Description

The present invention relates to an arrangement for spacing lamellae of a lamellar switching element of a vehicle transmission according to the closer defined in the preamble of claim 1. Art.

Arrangements for spacing lamellas are known from automotive engineering. For example, from the document US 1,340,885 a multi-disc clutch is known in which corrugated lining plates are provided to provide a distance between a steel plate and an adjacent lining plate. Furthermore, from the document US Pat. No. 3,791,500 a further multi-plate clutch known in which between the steel plates a corrugated spring is arranged.

The aforementioned measures in the known multi-plate clutches serve to reduce drag torque between the slats when the slat switching element is open. However, it has been shown that the clearance created by each individual measure is insufficient to sufficiently reduce the power loss resulting from the drag torque. In addition, the use of corrugated fins in a lamellae switching element with high peripheral speed in the open state causes a so-called lamella wobble, which leads to vibrations in the gearbox and excessive pad wear.

The present invention is based on the object to propose an arrangement for spacing lamellae of the type described above, on the one hand to reduce the power loss caused by drag torque to a minimum and on the other hand to prevent a safety-critical lamellae.

This object is achieved by the features of claim 1, wherein advantageous embodiments of the dependent claims, the drawings and the description.

Accordingly, an arrangement for spacing lamellae of a lamellar switching element in a vehicle transmission is proposed, in which at least one elastic spacer element is provided between adjacent outer lamellae or between adjacent inner lamellae, and at least one outer lamella or at least one inner lamella has an elastic wave shape or the like.

Due to the combination of spacing adjacent slats of the same type and the additional spacing of adjacent slats of different types, on the one hand results in a desired sufficient Schleppmomentreduzierung and in addition, this reliably prevents the occurrence of lamellae.

With the provided elastic spacer element axial forces are exerted on both adjacent lamellae of the same kind, ie on the outer lamellae or on the inner lamellae to push them apart. By using corrugated outer plates, such. As steel fins, or corrugated inner fins such. B. lining slats, also results in a distancing between an outer plate and the adjacent lining plate. Only this combination of the aforementioned measures solves the problem of the invention.

In an advantageous embodiment of the invention it is provided that the spacer element is preferably arranged in the region of the outer diameter of the slats of the same type. In the provision of the spacer elements each between as z. B. steel plates adjacent outer plates is the respective spacer element radially outside of the z. B. lining blades running inner disks arranged. This results in a particularly simple design.

The proposed arrangement can be used in any vehicle transmission. A preferred use results in a multi-speed automatic transmission, preferably with eight gears, in which the arrangement is arranged on at least one designed as a clutch or brake disc switching element.

Hereinafter, the present invention will be further explained with reference to the drawings. Show it:

1 a schematic, sectional view of a possible embodiment of an inventive arrangement in a designed as a multi-plate clutch plate switching element;

2 a schematic view of a trained as a wave spring spacer element of the arrangement;

2A a schematic sectional partial view of the corrugated spring according to 2 ;

3 a schematic view of a corrugated lining plate of the arrangement; and

4 a diagram with different Schleppmomentverläufen depending on the drive speed.

In the figures, a possible embodiment of an inventive arrangement for spacing lamellae of a lamellar switching element of a vehicle, by way of example with reference to a multi-plate clutch 1 with several z. B. designed as steel plates outer plates 2 and several z. B. designed as lining plates inner plates 3 exemplified. The outer disks 2 and the inner plates 3 are arranged alternately in the axial direction next to each other. For actuating the multi-disc clutch 1 be on an outer disk carrier 4 held steel plates and on an inner disc carrier 5 held Belaglamellen brought into abutment.

To minimize an unwanted drag torque and to prevent a safety-critical lamella wobble is provided that in each case between adjacent steel plates or outer plates 2 at least one elastic spacer element in the form of a corrugated spring 6 is provided and additionally each lining plate or inner plate 3 an elastic waveform for spacing a steel plate from an adjacent lining plate. Only when the multi-plate clutch is actuated 1 become the corrugated springs 6 between the outer plates 2 and the corrugated inner fins 3 deformed accordingly, so that the outer plates 2 with the inner plates 3 be planted.

In 2 and 2A are detailed views of the wave spring 6 shown. From these views it becomes clear that the corrugated spring 6 a plurality of circumferentially distributed in the axial direction protruding wave peaks to produce a predetermined gap between adjacent steel plates. Preferably, for example, eight peaks may be formed over the circumference of the wave spring 6 be arranged distributed.

In 3 is an example of a lining plate as an inner plate 3 represented, which has an elastically corrugated shape. The corrugated lining plate comprises distributed over the circumference a plurality of wave crests, which also protrude in the axial direction, so that a predetermined clearance between a steel plate and an adjacent lining plate is realized.

How out 1 can be seen, the corrugated springs 6 on the outer disk carrier 4 or the steel blades 2 even the multi-plate clutch 1 be attached. Alternatively, the corrugated springs 6 loose axially between the steel plates 2 be inserted. Furthermore, the corrugated springs 6 in the range of the outer diameter, ie radially outside of the lining blades 3 axially between the steel plates 2 arranged.

In the illustrated embodiment, the arrangement is at a as a multi-plate clutch 1 executed slats switching element of an eight-speed automatic transmission arranged in planetary design.

In 4 is a diagram with several Schleppmomentverläufen at differently shaped slats about the input speed exemplified in third gear at 40 ° C.

The characteristic of the drag torque marked with diamonds results in an arrangement in which planar lining blades are used. The course marked with triangles results in separate or spaced steel plates. Finally, the course marked by circles shows the combination according to the invention of the proposed arrangement, in which corrugated lining disks and separated steel disks are provided.

It becomes clear from the various courses that a significant reduction of the drag torques is achieved only when the combination of separated steel disks and corrugated lining disks according to the invention is used.

LIST OF REFERENCE NUMBERS

1

multi-plate clutch

2

Outer plate or steel plate

3

Inner plate or lining plate

4

External disk carrier

5

Inner disk carrier

6

Well spring

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

• US 1340885 [0002]
• US 3791500 [0002]

Claims (9)

Arrangement for spacing lamellae of a lamellar switching element of a vehicle transmission, with a plurality of outer lamellae ( 2 ) and a plurality of inner disks ( 3 ), which are arranged alternately axially next to one another and which can be brought into contact when the vane switching element is actuated, characterized in that between adjacent outer fins ( 2 ) or between adjacent inner disks ( 3 ) at least one elastic spacer element is provided and that at least one inner plate ( 3 ) or at least one outer fin ( 2 ) an elastic waveform for spacing of adjacent outer and inner plates ( 2 . 3 ) having. Arrangement according to claim 1, characterized in that as a resilient spacer element, a corrugated spring ( 6 ) is provided. Arrangement according to claim 2, characterized in that the corrugated spring ( 6 ) is designed approximately annular and over its circumference a predetermined waveform for spacing of adjacent outer plates ( 2 ) having. Arrangement according to one of the preceding claims, characterized in that spacer elements in each case axially between adjacent designed as steel plates outer plates ( 2 ) are arranged. Arrangement according to claim 4, characterized in that each spacer element with respect to the inner plates ( 3 ) is arranged radially on the outside. Arrangement according to one of claims 1 to 5, characterized in that each spacer element on the outer disk carrier ( 4 ) or on the outer plates ( 2 ) is attached. Arrangement according to one of claims 1 to 5, characterized in that axially in each case between two outer plates ( 2 ) each loose a spacer element in the outer disk carrier ( 4 ) is inserted. Arrangement according to one of the preceding claims, characterized in that each lining plate designed as an inner plate ( 3 ) has an elastically corrugated shape. Arrangement according to one of the preceding claims, characterized in that the arrangement in a as a multi-plate clutch ( 1 ) or brake running lamellae switching element of an eight-speed automatic transmission is arranged in planetary construction.

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