US 7,427,171 B2Granted

Pressure vessel formed by joining two members made of different materials

AssigneesAoyama Seisakusho Ibaraki Plant Co., Ltd., Nagano Keiki Co., Ltd., Akihisa Inoue

InventorsAkira Tokairin, Katsumi Ose, Ryo Tominaga, Hiroshi Nagasaka, Naoki Yoshida, Akihisa Inoue

Life of this patent

Estimating the term…

Loading patent…

Abstract

A cylindrical joining member is fitted into a member to be joined that is made of a material different from the joining member. Plastic deformation is effected in a soft material of the member to be joined to hermetically join the two members together. Joining faces are provided to the two members that face and are joined to each other by the plastic deformation and with an elastic deformation pressure in an axial direction. The soft material of the member to be joined, which is located in a circumferential direction of the member, bites into a joining portion of the joining member by the plastic deformation and with the elastic deformation pressure.

Claims28

Dependent claims

A pressure vessel comprising:

a pair of members made of different materials and fitted together, said pair of members including:
a first one of said pair of members defining an outer cylinder of the pressure vessel and having a joining face;
and
a cup-shaped second one of said pair of members having a closed end and a joining face;
wherein said first one of said pair of members is made of a plastically deformable metal material;
wherein said second one of said pair of members is made of a material having a greater hardness than said plastically deformable metal material of said first one of said pair of members, said second one of said pair of members having an annular protrusion on an axial end surface portion of said joining face of said second one of said pair of members, and having an annular groove on an outer circumferential surface portion of said joining face of said second one of said pair of members;
wherein said pair of members are fitted together such that:
said annular protrusion of said second one of said pair of members bites into said joining face of said first one of said pair of members so as to be held by elastic deformation pressure of said first one of said pair of members;
and
said plastically deformable metal material of said first one of said pair of members extends into said annular groove of said second one of said pair of members so as to hold said second one of said pair of members by the elastic deformation pressure.

7 more elements

A joint structure of a pressure vessel, comprising:

a pair of members made of different materials and to be fitted together, said pair of members including:
a first one of said pair of members defining an outer cylinder of the pressure vessel and having a joining face;
and
a cup-shaped second one of said pair of members having a closed end and a joining face;
wherein said first one of said pair of members is made of a plastically deformable metal material;
wherein said second one of said pair of members is made of a material having a greater hardness than said plastically deformable metal material of said first one of said pair of members, said second one of said pair of members having an annular protrusion on an axial end surface portion of said joining face of said second one of said pair of members, and having an annular groove on an outer circumferential surface portion of said joining face of said second one of said pair of members;
wherein said pair of members are shaped and arranged to be fitted together such that:
said annular protrusion of said second one of said pair of members is formed to bite into said joining face of said first one of said pair of members so as to be held by elastic deformation pressure of said first one of said pair of members;
and
said plastically deformable metal material of said first one of said pair of members is formed to extend into said annular groove of said second one of said pair of members so as to hold said second one of said pair of members by the elastic deformation pressure.

7 more elements

A pressure vessel comprising:

a pair of members made of different materials and fitted together, said pair of members including:
a cup-shaped first one of said pair of members having a closed end and a joining face;
and
a second one of said pair of members defining an outer cylinder of the pressure vessel and having a joining face;
wherein said first one of said pair of members is made of a plastically deformable metal material;
wherein said second one of said pair of members is made of a material having a greater hardness than said plastically deformable metal material of said first one of said pair of members, said second one of said pair of members having an annular protrusion on an axial end surface portion of said joining face of said second one of said pair of members, and having an annular groove on an inner circumferential surface portion of said joining face of said second one of said pair of members;
wherein said pair of members are fitted together such that:
said annular protrusion of said second one of said pair of members bites into said joining face of said first one of said pair of members so as to be held by elastic deformation pressure of said first one of said pair of members;
and
said plastically deformable metal material of said first one of said pair of members extends into said annular groove of said second one of said pair of members so as to hold said second one of said pair of members by the elastic deformation pressure.

7 more elements

A joint structure of a pressure vessel, comprising:

a pair of members made of different materials and to be fitted together, said pair of members including:
a cup-shaped first one of said pair of members having a closed end and a joining face;
and
a second one of said pair of members defining an outer cylinder of the pressure vessel and having a joining face;
wherein said first one of said pair of members is made of a plastically deformable metal material;
wherein said second one of said pair of members is made of a material having a greater hardness than said plastically deformable metal material of said first one of said pair of members, said second one of said pair of members having an annular protrusion on an axial end surface portion of said joining face of said second one of said pair of members, and having an annular groove on an inner circumferential surface portion of said joining face of said second one of said pair of members;
wherein said pair of members are shaped and arranged to be fitted together such that:
said annular protrusion of said second one of said pair of members is formed to bite into said joining face of said first one of said pair of members so as to be held by elastic deformation pressure of said first one of said pair of members;
and
said plastically deformable metal material of said first one of said pair of members is formed to extend into said annular groove of said second one of said pair of members so as to hold said second one of said pair of members by the elastic deformation pressure.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/947,165Filed 23 Sep 2004
Priority: JP 2003-33417725 Sep 2003
Published: US 2005/0067831 A131 Mar 2005
Granted: 23 Sep 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B23P 11/02
Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for: by first expanding and then shrinking…
B21D 39/04
Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating ; Tube expanders: of tubes…
B21J 1/006
Selecting material: amorphous metal
B21K 1/16
Fittings: parts of pipe or hose couplings