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US006687968B2
(12) United States Patent (io) Patent No.: US 6,687,968 B2
Willerscheid et al. (45) Date of Patent: Feb. 10,2004
(54) FRICTION GENERATING DEVICE AND METHOD OF MAKING THE SAME
(75) Inventors: Heiner Willerscheid, Sasbach (DE); Karl Wurm, Buhl (DE)
(73) Assignee: LuK Lamellen und Kupplungsbau Beteiligungs KG, Buhl (DE)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 10/174,459
(22) Filed: Jun. 17, 2002
(65) Prior Publication Data
US 2003/0141164 Al Jul. 31, 2003
Related U.S. Application Data
(63) Continuation ol application No. 07/952,568, filed on Sep. 28, 1992.
(30) Foreign Application Priority Data
Sep. 28, 1991 (DE) P 41 32 421
May 26, 1992 (DE) P 42 17 358
(51) Int. CI.7 B23K 26/00
(52) U.S. CI 29/421.1; 83/53; 156/248;
156/272.8; 188/259; 192/107 R; 219/121.18;
228/160
(58) Field of Search 29/421.1; 83/53,
83/177; 156/247, 248, 272.8; 451/38; 192/107 R;
228/160; 188/259, 77 R, 77 W; 219/121.18
(56) References Cited
U.S. PATENT DOCUMENTS
3,231,058 A * 1/1966 Batchelor et al 192/107 R
3,526,162 A * 9/1970 Willcox 83/177
3,532,014 A * 10/1970 Franz 83/53
3,668,028 A * 6/1972 Short 156/272.8
3,893,225 A * 7/1975 Hamrick et al 228/173.6
4,406,394 A * 9/1983 Nels 228/170
5,097,731 A * 3/1992 Vives et al 83/53
5,934,435 A * 8/1999 Bauer 192/107 R
* cited by examiner
Primary Examiner—Rodney H. Bonck
(74) Attorney, Agent, or Firm—Darby & Darby
(57) ABSTRACT
A friction lining for use in the clutch plate of a friction clutch or a multiple wrap brake band for use in an automatic transmission is obtained by adhesively securing one side of a friction generating second layer to one side of a metallic first layer. The necessary incisions in the form of cuts, slots or slits are made from the exposed side of the second layer in a direction toward the exposed side of the first layer by resorting to one or more high-energy streams, such as laser beams, electron beams or liquid jets. Each incision can be made in one or more stages by a single stream or by a series of successively applied streams.
13 Claims, 4 Drawing Sheets
