Method and device for producing a friction or rubbing element

• US 4,883,638 A
• Filed: 05/10/1988
• Issued: 11/28/1989
• Est. Priority Date: 05/20/1987
• Status: Expired due to Term

• Current Assignee: Hoerbiger Antriebstechnik GmbH (Hoerbiger-Stiftung)
• Original Assignee: Enfo Grundlagenforschungs AG
• Inventors: Putz, Hermann, Blankenhagen, Fred
• Primary Examiner(s): Lechert, Jr., Stephen J.
• Assistant Examiner(s): Bhat, Nina
• Application Number:
  US07/192,700
• Time in Patent Office: 567 Days
• Field of Search: 419/9, 419/13, 419/6, 428/548
• US Class Current: 419/9
• CPC Class Codes: B29L 2031/16 Frictional elements, e.g. brake or clutch linings
• CPC Class Codes: F16C 2220/20 by sintering pulverised material, e.g. powder metallurgy
• CPC Class Codes: F16C 2220/44 by rolling
• CPC Class Codes: F16C 2220/60 by removing material, e.g. machining
• CPC Class Codes: F16C 2223/42 by spraying the coating material, e.g. plasma spraying
• CPC Class Codes: F16C 2226/34 by brazing
• CPC Class Codes: F16C 2226/36 by welding
• CPC Class Codes: F16C 2361/43 Clutches, e.g. disengaging bearing
• CPC Class Codes: F16C 2361/45 Brakes
• CPC Class Codes: F16C 33/14 Special methods of manufacture; Running-in
• CPC Class Codes: F16D 2023/0681 Double cone synchromesh clutches
• CPC Class Codes: F16D 2065/024 the braking surface being inclined with respect to the rotor's axis of rotation at an angle other than 90 degrees, e.g. comprising a conical rotor
• 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 2069/0458 metallurgic, e.g. welding, brazing, sintering
• CPC Class Codes: F16D 2069/0483 Lining or lining carrier material shaped in situ
• CPC Class Codes: F16D 2069/0491 Tools, machines, processes
• CPC Class Codes: F16D 2250/00 Manufacturing; Assembly
• CPC Class Codes: F16D 23/025 Synchro rings
• CPC Class Codes: F16D 65/10 Drums for externally- or internally-engaging brakes
• CPC Class Codes: F16D 65/127 characterised by properties of the disc surface; Discs lined with friction material
• 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 69/027 : Compositions based on metals or inorganic oxides
• CPC Class Codes: F16D 69/04 : Attachment of linings
• CPC Class Codes: Y10T 428/12028 : Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]

Abstract

A friction or rubbing element for clutches, brakes, bearings or the like consists of a metal ring element with at least one uneven friction or rubbing surface which is substantially rotationally symmetrical about the ring axis and comprises a spray-sintered lining directly sintered thereon. To produce this lining the ring element is arranged in a level position together with a sinter mould disposed substantially concentrically to the side of the friction or rubbing surface in such a manner as to maintain an annular gap. After filling the annular gap with sinter powder, the complete assembly is heated to sintering temperature. The sinter mould material has a coefficient of thermal expansion which in the case of an internal sinter mould is greater than and in the case of an external sinter mould is less than that of the ring element, pressure being applied during sintering by virtue of the different temperature expansion.

Claims

1. A method for producing a friction or rubbing element for clutches, brakes, bearings or the like, which consists of a metal ring element with at least one uneven friction or rubbing surface which is substantially rotationally symmetrical about the ring axis and to which a spray-sintered lining is applied, the ring element being placed in an at least largely level position together with a sinter mould disposed substantially concentrically to the side of the friction or rubbing surface in such a manner as to maintain an annular gap, the annular gap being filled with sinter powder, sintering being carried out at sintering temperature, and the spray-sintered lining being compacted, characterised in that in order to compact the the sinter powder contained in the annular gap (10) at sintering temperature, a sinter mould (7) is used of a material having a coefficient of thermal expansion which is different from that of the ring element (2), and which in the case of an internal sinter mould (7) is greater than and in the case of an external sinter mould is less than that of the ring element (2).

2. A method as claimed in claim 1, characterised in that in order to vary the applied pressure at sintering temperature sinter moulds (7) of materials with different coefficients of thermal expansion are used.

3. A method as claimed in claim 1 or 2, characterised in that in the case of steel, sintered steel or brass ring elements (2), interior sinter moulds (7) of X 12 CrNi 188 steel and/or exterior sinter moulds of X 20 Cr 13 steel or ceramic are used.