US 2016/0256965 A1 · METHOD OF MANUFACTURING A HOLLOW POPPET VALVE

Abstract

A method of manufacturing a hollow poppet valve capable of storing a large amount of a coolant in an internal cavity (S) of the valve, which cavity extends from within its valve head (14) into a valve stem portion (12) and is filled with a coolant (19) together with an inert gas. The method comprises steps of: (i) forming a coolant rod (19a) of a predetermined length from a linear clayish coolant (19) to extruded from an extruder (20); (ii) inserting a coolant-rod into a cavity formed in an intermediate valve product (11) through its opening; and (iii) sealing the opening of the hole (S). In the step (ii), a coolant-rod may be divided into a shorter and thicker multiple pieces (19a, 19b) for divisional insertion into the cavity (S) in multiple times, so that they have little interference with the inner periphery of the cavity (S).

Claims7

Dependent claims

1-7. (canceled)

A method of manufacturing a hollow poppet valve having an internal cavity that extends from within a valve head into a stem portion of the hollow poppet valve and is filled with a coolant, the method comprising:

a coolant-rod forming step for extruding from a nozzle of an extruder linear clayish coolant and cutting the linear coolant into coolant rods of a predetermined length;
a coolant-rod inserting step for inserting the coolant rod into a hole of an intermediate valve product that corresponds to the internal cavity of the hollow poppet valve, through an open end of the hole;
and
a sealing step for sealing the open end of the hole,
the method characterized by comprising;
a multiplicity of the coolant-rod insertion steps for inserting more than one coolant-rods into the hole of the intermediate valve product;
and
a coolant-rod pressurizing step for pressurizing each of the coolant rods in the hole with a pressing rod following insertion of each coolant rod.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/035,955Filed 21 Nov 2013

Published

8 Sep 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

B23P 15/002
Valves or valve housings: poppet valves
B21K 1/22
Valve parts: poppet valves, e.g. for internal-combustion engines
F01L 3/14
Cooling of valves: by means of a liquid or solid coolant, e.g. sodium, in a closed chamber in a valve
F01L 3/08
Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the…:…

Method of manufacturing a hollow poppet valve

Life of this patent

Method of manufacturing a hollow poppet valve

Life of this patent

Abstract

Claims7