Method for bonding a valve seat with a cylinder head
Patent 5802716 Issued on September 8, 1998. Estimated Expiration Date: 
September 27, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 27, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3170452 Method of brazing an aluminum material Method of brazing an aluminum material Brazing flux Brazing flux Brazing flux Patent #: 5171377 InventorsAssigneeApplicationNo. 534611 filed on 09/27/1995US Classes:29/888.06, Cylinder, cylinder head or engine valve sleeve making29/888.46With assembly or composite article makingExaminersPrimary: Cuda, IreneAttorney, Agent or FirmForeign Patent References
International ClassB23P 015/00Foreign Application Priority Data1994-09-30 JPAbstractA method for bonding valve seats for intake and exhaust valves to an engine cylinder head. Valve seats are brazed to an aluminum cylinder head using an Al--Zn type brazing material and a fluoride type flux. The brazing material contains 70 to 90 % by weight of Zn. The brazing is preferably carried out at a temperature of 470° to 520° C. To allow the brazing material and flux to be present between the cylinder head and each valve seat, the cylinder head contains U-grooves formed around the opening of each intake or exhaust port. The U-groove consists of an annular step formed along the opening of the intake or exhaust port and a bank extended along the inner circumference of the step. The valve seats are placed in the U-grooves, which are then filled with the brazing material and flux, to carry out brazing of the valve seats onto the cylinder head. After completion of the brazing, the banks are removed to complete bonding of the valve seats to the cylinder head. In another method, a valve seat is directly bonded to a cylinder head by applying a fluoride type flux on the valve seat.Field of SearchCylinder, cylinder head or engine valve sleeve makingValve seat making With assembly or composite article making Assembling or joining And nonferrous metal member Applying preliminary bond facilitating metal coating Applying flux Flux affixed to or incorporated with filler Valve seat relation | |
