BRAKE DRUM AND METHOD FOR PRODUCING SUCH A BRAKE DRUM

• US 20200132145A1
• Filed: 04/17/2018
• Published: 04/30/2020
• Est. Priority Date: 04/27/2017
• Status: Active Grant

• Current Assignee: KS Huayu Altutech GmbH
• Original Assignee: KS Huayu Alutech GmbH (Rheinmetall AG)
• Inventors: SCHRAMM, LEANDER, KLIMESCH, CHRISTIAN, MOEDING, HERBERT
• Granted Patent: US 11,149,812 B2
• Time in Patent Office: Days
• CPC Class Codes: F16D 2065/132 layered
• CPC Class Codes: F16D 2065/1324 carrying friction elements
• CPC Class Codes: F16D 2065/1344 permanent, e.g. by casting
• CPC Class Codes: F16D 2069/0441 Mechanical interlocking, e.g. roughened lining carrier, mating profiles on friction material and lining carrier
• CPC Class Codes: F16D 2200/0013 Cast iron
• CPC Class Codes: F16D 2200/0021 Steel
• CPC Class Codes: F16D 2200/003 Light metals, e.g. aluminium
• CPC Class Codes: F16D 2200/0047 Ceramic composite, e.g. C/C composite infiltrated with Si or B, or ceramic matrix infiltrated with metal
• CPC Class Codes: F16D 2200/0082 Production methods therefor
• CPC Class Codes: F16D 2250/0007 Casting
• CPC Class Codes: F16D 2250/0038 Surface treatment
• CPC Class Codes: F16D 2250/0046 Coating
• CPC Class Codes: F16D 65/10 Drums for externally- or internally-engaging brakes
• CPC Class Codes: F16D 69/00 Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces clutching elements F16D13/60; braking members F16D65/02
• CPC Class Codes: F16D 69/04 Attachment of linings

Abstract

A brake drum for a vehicle includes a friction ring and a drum body. The friction ring has grooves arranged on a radial outer surface along a circumference, and a coating formed on the grooves. The drum body is cast onto the radial outer surface of the friction ring so that the grooves are filled with a material of the drum body. The grooves include first grooves and second grooves. A first axial segment is formed at the friction ring in which the first grooves are introduced so that the first grooves are inclined relative to a first axial end of the friction ring. A second axial segment is formed at the friction ring in which the second grooves are introduced so that the second grooves are inclined in a direction which is opposite to that of the first axial segment. Each of the grooves have undercuts.

Claims

1-18. -18. (canceled)

19. :

A brake drum for a vehicle, the brake drum comprising;

a friction ring comprising,

grooves arranged on a radial outer surface along a circumference, and

a coating formed on the grooves on the radial outer surface; and

a drum body comprising a material, the drum body being cast onto the radial outer surface of the friction ring so that the grooves are filled with the material of the drum body,

wherein,

the grooves comprise first grooves and second grooves,

a first axial segment is formed at the friction ring in which the first grooves are introduced so that the first grooves are inclined relative to a first axial end of the friction ring,

a second axial segment is formed at the friction ring in which the second grooves are introduced so that the second grooves are inclined in a direction which is opposite to that of the first axial segment, and

the grooves each comprise undercuts as seen in a radial direction.

20. :

The brake drum as recited in claim 19, wherein,

an inclination angle of the first grooves relative to a center axis of the friction ring becomes smaller in the first axial segment with a decreasing distance to the first axial end, as seen in the direction of the first axial end, and

an inclination angle of the second grooves in the second axial segment becomes smaller with a decreasing distance to a second axial end which is opposite to the first axial end, as seen in the direction of the second axial end.

21. :

The brake drum as recited in claim 20, wherein the friction ring further comprises a third segment in which no grooves are formed, and which extends from the second axial segment to the second axial end.

22. :

The brake drum as recited in claim 20, wherein the grooves extend in a circumferential direction and have a depth of 0.03 to 2 mm.

23. :

The brake drum as recited in claim 22, wherein the first grooves in the first axial segment extend in an opposite direction to the second grooves in the second axial segment in a thread-type manner in the circumferential direction.

24. :

The brake drum as recited in claim 20, wherein

the first grooves in the first axial segment are arranged in an opposite direction to the second grooves in the second axial segment, and

the second grooves which are adjacent to each other are arranged at a constant distance to each other so that they are disposed one behind the other.

25. :

The brake drum as recited in claim 20, wherein,

each of the first grooves comprise defining flanks,

each of the second grooves comprise defining flanks, and

the first grooves and the second grooves each comprise an opening angle of 20°

to 40°

between their respective defining flanks.

26. :

The brake drum as recited in claim 25, wherein,

each of the defining flanks of the first grooves comprise a leading flank,

each of the defining flanks of the second grooves comprise a leading flank, and

an inclination angle between the center axis and each leading flank is 20°

to 60°

.

27. :

The brake drum as recited in claim 25, wherein,

each of the defining flanks of the first grooves further comprise a trailing flank,

each of the defining flanks of the second grooves further comprise a trailing flank, and

the inclination angle of the leading flank of each if the first grooves and the second grooves corresponds to an inclination angle of the trailing flank.

28. :

The brake drum as recited in claim 19, wherein,

the friction ring is made from a gray cast iron, steel, a metal-matrix compound material or a heavy-metal alloy, and

the drum body is made from an aluminum silicon or an aluminum magnesium alloy.

29. :

The brake drum as recited in claim 28, wherein the aluminum magnesium alloy of the drum body comprises a nickel fraction and a copper fraction which is <

0.05 wt.-%.

30. :

The brake drum as recited in claim 19, wherein the coating (40) has a layer thickness of from 0.01 mm to 0.8 mm and is made from zinc, a zinc-based alloy, nickel or an aluminum-based alloy.

31. :

A method for producing the brake drum as recited in claim 19, the method comprising;

casting a friction ring from a gray cast iron, steel, a metal-matrix compound material or a heavy-metal alloy;

mechanically machining a radial outer surface of the friction ring so as to introduce grooves, the grooves being introduced into the radial outer surface in a first segment and in a second segment of the friction ring so that the grooves are inclined in opposite directions to each other and form undercuts as seen in a radial direction;

coating the mechanically machined radial outer surface with zinc or a zinc-based alloy, nickel or an aluminum-based alloy; and

casting a drum body from an aluminum silicon alloy or an aluminum magnesium alloy onto the radial outer surface of the friction ring.

32. :

The method as recited in claim 31, wherein the coating is applied via a thermal spraying, via a galvanic process or via a zinc coating.

33. :

The method as recited in claim 32, wherein,

the coating is applied via the thermal spraying, and

prior to the thermal spraying, the method further comprises;

blasting the radial outer surface, or

chemically treating the radial outer surface.

34. :

The method as recited in claim 32, wherein,

the coating is applied via the galvanic process, and

prior to the galvanic process, the method further comprises;

etching or pickling the radial outer surface; and

then

treating the radial outer surface with electrolytes.

35. :

The method as recited in claim 34, further comprising;

applying a nickel layer to the radial outer surface prior to the galvanic process.

36. :

The method as recited in claim 31, wherein the casting of the drum body is performed via a pressure casting process.