US 5,704,121 AGranted

Method of making a valve seat retainer

AssigneeBriggs & Stratton Corporation

InventorJohn D. Santi

Life of this patent

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Abstract

A valve seat retainer is formed having a flange that extends over the valve seat and that applies both a radial and a longitudinal force to the valve seat. The flange extends an order of magnitude further than typical prior art valve seat retaining flanges. The flange is created by a rolling method with a roller having a unique surface profile. The roller surface has a pair of spaced ridges with a groove in between, and a curved convex surface adjacent to one of the ridges. When a downward force is applied to the roller, the curved surface on the roller causes the roller to move radially inward while at the same time material from the upper surface of the engine block is disposed in the groove and is moved to create the flange.

Claims6

Dependent claims

A method of manufacturing a valve seat retainer for an internal combustion engine having a block, comprising:

providing a roller, including
providing first and second spaced ridges on said roller;
providing a groove disposed between said first and second ridges;
providing a curved surface adjacent to said first ridge and radially outward from said groove with respect to said longitudinal axis;
placing a valve seat in a recess of said block, said valve seat having a longitudinal axis;
applying said roller to a surface of said block;
rotating said roller and changing the relative position between said roller and said block to move material from said block surface;
moving said roller in a radial direction toward said valve seat longitudinal axis during said rotating step;
and
creating a flange using said moved material, said flange extending over said valve seat.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/547,952Filed 25 Oct 1995 · division
Priority: 17 May 1995
Granted: 6 Jan 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F01L 3/22
Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the…:…
Y10T 29/49231
Prime mover or fluid pump making: i.C. [internal combustion] engine making
Y10T 29/4927
Prime mover or fluid pump making: cylinder, cylinder head or engine valve sleeve making
Y10T 29/49306
Poppet or I.C. engine valve or valve seat making: valve seat making

Family

Serial443,378Parent of this division · filed 17 May 1995
US 5,522,353 AParent of this division
US 5,704,121 AThis patent

From the US filing history. Foreign family members aren’t listed.

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