DE102015213116A1 - synchronizer ring - Google Patents

Abstract

In a synchronizer ring for a transmission, it is provided that the synchronizer ring is made entirely of a friction material, wherein in the ring metallic carriers are embedded in particular made of steel and completely surrounded by the friction material. To produce this synchronizer ring, a thermoset debris grouting mass is highly compressed together with the carriers in a tool and subsequently heat treated.

Description

The invention relates to a synchronizer ring in a transmission for adjusting the rotational speeds of the engine side to the transmission side during a switching operation and a method for its preparation. Synchronizer rings generally have friction linings, which are each applied either on a synchronous inner ring, a synchronous intermediate ring or synchronous outer ring.

The DE 10203019 A1 shows a multi-part synchronizer ring of a synchronizer with a friction surface and drivers for positive engagement in a synchronizer body carrier. The synchronizer ring is made entirely of metal and is intended to be formed by drawing, stamping or punching.

The DE 10028472 A1 shows a synchronizer ring or coupling ring for a synchronizer with a shaped sheet metal ring body.

The DE 102008045593 A1 shows a friction body for a synchronizer of a transmission, wherein the friction body has Reibkörner, which are mixed with a composite material. As a method for producing and shaping such a friction body, this is injected or pressed.

The invention has for its object to provide a synchronizer ring of low weight and to provide a method for producing the synchronizer ring.

The object is achieved by the features of claims 1 and 4.

It is a particular advantage of the invention that the synchronizer ring is made of a low cost material and has a low weight with sufficient strength. To reinforce the synchronizer ring and thus to ensure a secure torque transmission provided driver of the synchronizer ring are made of metal.

Further advantages are described in the subclaims. Embodiments of the invention are illustrated in the drawings and will be described below. Show it

1 a synchronizing ring in perspective view in a schematic representation

2 the synchronizer ring with a first alternative embodiment of a driver

3 the synchronizer ring with a second alternative embodiment of the driver

4 the synchronizer ring with a third alternative embodiment of the driver

5 the synchronizer ring with a fourth alternative embodiment of the driver.

A synchronizer ring 1 , in particular a synchronizer intermediate ring, has, as in 1 show a cone-shaped structure with a small diameter D1 and a large diameter D2 (D2> D1). Over a rim with the large diameter D2 protruding are a number, preferably three, driver 2 evenly on the circumference of the synchronizer ring 1 arranged distributed.

The drivers 2 are made of a metal, z. B. a curable or thermosetting or nitrocarbonierbaren steel and in the ring body 3 of the synchronizer ring 1 stored. The stored part of the carriers 2a to 2e each has a relation to the protruding part larger volume to a good grip of the driver 2a to 2e in the ring body 3 to reach. The ring body 3 is made of a thermosetting rubble compound with very good friction properties.

The debris press mass forms the ring body on the one hand 3 of the synchronizer ring 1 and on the other hand surrounds the drivers 2 so put these on their over the ring body 3 outstanding parts are completely coated with the debris grout.

The thermoset debris compact preferably has the following composition:
20-30% phenol novolac (possibly modified with cashew nut shell oil CNSL),
5-15% carbon fibers,
30-60% carbon particles (soot, coke, graphite),
0-10% Armidfasern.

In 2 is an alternative driver 2 B shown, which for enlarging the surface of the stored part a number of downwardly directed projections 4 having.

In 3 is a driver 2c shown, which on the embedded part laterally formed projections 6 having.

In 4 is a driver 2d shown, which at the embedded part a conical tip 7 having.

In 5 is a driver 2e shown, which has a cross-sectionally T-shaped design on the embedded part.

For the production of the synchronizer ring 1 For example, the thermoset rubble compound in powder form is preferably enriched with carbon fibers and then into one, the conical shape of the synchronizer ring 1 appropriate, filled tool.

Thereupon, any number of preferably three drivers 2 introduced into the filled powder.

In the next step, the powder in the tool is highly compressed so that the drivers 2 positively connected with the thermoset rubble compact.

After the pressing process, the synchronizer ring 1 subjected to a temperature treatment and crosslinked in a kiln cycle at temperatures between 160 ° and 250 °.

It is also proposed to carry out the temperature treatment already in the tool, in which this is heated accordingly.

LIST OF REFERENCE NUMBERS

1

 synchronizer ring

2

 takeaway

2a

 takeaway

2 B

 takeaway

2c

 takeaway

2d

 takeaway

2e

 takeaway

3

 ring body

4

 head Start

5

6

 head Start

7

 apex

8th

 T-molding

D1

Small diameter ( 3 )

D2

Large diameter ( 3 )

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

• DE 10203019 A1 [0002]
• DE 10028472 A1 [0003]
• DE 102008045593 A1 [0004]

Claims (4)

Synchronizer ring for a transmission with a Reibmaterialbeschichtung and drivers, characterized in that the synchronizer ring ( 1 ) from a duroplastic debris grout ( 3 ) and metallic drivers ( 2 ), which in the debris press mass ( 3 ) are embedded and surrounded by this. Synchronizer ring according to claim 1, characterized in that the duroplastic debris press mass ( 3 ) Comprises carbon fibers. Synchronizer ring according to claim 1 or 2, characterized in that the thermoset debris comprises a composition of 20-30% phenol novolac, 5-15% carbon fibers, 30-60% carbon particles and 0-10% Armidfasern. Method for producing a synchronizer ring from a thermoset rubble compact with embedded metallic carriers, characterized in that first the powdered thermosetting rubble compact ( 3 ) is filled in a tool, that is the metallic driver ( 2 ) are introduced into the powder and that in a further step for producing a positive connection, the thermosetting debris press mass ( 3 ) and the synchronizer ring ( 1 ) is then crosslinked by a temperature treatment in a kiln cycle with temperatures between 160 ° and 250 ° degrees.

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