(19)
(11) EP 0 740 055 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.11.1996 Bulletin 1996/48

(43) Date of publication A2:
30.10.1996 Bulletin 1996/44

(21) Application number: 96106675.0

(22) Date of filing: 26.04.1996
(51) International Patent Classification (IPC)6: F01L 3/22
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 26.04.1995 JP 101998/95
26.04.1995 JP 102004/95

(71) Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
Iwata-shi Shizuoka-ken, 438 (JP)

(72) Inventors:
  • Adachi, Shuhei
    Iwata-shi, Shizuoka-ken (JP)
  • Inami, Junichi
    Iwata-shi, Shizuoka-ken (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)

   


(54) Method of bonding a valve seat


(57) A method for producing a valve seat within a cylinder head unit provided with valve openings associated with respective valve guide holes for receiving valve guides for associated intake or exhaust valves opening and closing said valve openings, respectively, comprises the steps of: (a) placing a valve seat base material onto a surface of said openings of said cylinder head unit, (b) pushing an electrode against the end face of said valve seat base material opposite to said cylinder head unit with a pushing direction matched with an axis of said intake or exhaust valve, whereby said electrode being adapted to apply electricity to said cylinder head unit through said valve seat base material, and (c) applying a finishing treatment to said bonded pieces to receive the desired valve seat.






Search report