Automobile suspension part

• US 8,961,714 B2
• Filed: 03/08/2011
• Issued: 02/24/2015
• Est. Priority Date: 03/15/2010
• Status: Active Grant

• Current Assignee: Klaus Schmidt
• Original Assignee: Kobe Steel Limited
• Inventors: Inagaki, Yoshiya, Sakamoto, Shogo
• Primary Examiner(s): King, Roy
• Assistant Examiner(s): MORILLO, JANELL COMBS
• Application Number:
  US13/043,011
• Publication Number:
  US 20110221151A1
• Time in Patent Office: 1,449 Days
• Field of Search: 148/415, 148/417, 420/535, 280/124.1
• US Class Current: 148/415
• CPC Class Codes: B21J 1/06 Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations B21J5/063 takes precedence
• CPC Class Codes: B21J 5/02 Die forging; Trimming by making use of special dies ; Punching during forging
• CPC Class Codes: B21K 1/74 forked members or members with two or more limbs, e.g. U-bolts, anchors
• CPC Class Codes: B60G 2206/12 with two attachment points on the sprung part of the vehicle
• CPC Class Codes: B60G 2206/124 the arm having triangular or Y-shape, e.g. wishbone
• CPC Class Codes: B60G 2206/7102 Aluminium alloys
• CPC Class Codes: B60G 2206/8101 by casting
• CPC Class Codes: B60G 2206/81022 by forging
• CPC Class Codes: B60G 2206/84 Hardening
• CPC Class Codes: B60G 7/001 Suspension arms, e.g. constructional features B60G7/006 takes precedence
• CPC Class Codes: B60G 99/00 Subject matter not provided for in other groups of this subclass
• CPC Class Codes: C22F 1/04 of aluminium or alloys based thereon
• CPC Class Codes: Y10T 29/49622 Vehicular structural member making

Abstract

A lightweight automobile suspension part having high strength is an aluminum alloy automobile suspension part having a through-hole, which has a yield strength of a normal section as a region where a crystal grain is not coarsened being 270 MPa or larger, and a minimum length between a rib end as a predetermined region on a side of the through-hole in a rib and a through-hole end as a predetermined region on a side of the through-hole in a web is 6 mm or larger.

Claims

1. An aluminum alloy automobile suspension part formed by forging, and comprising a rib, a web formed at an end of the rib, and a through-hole in the web, wherein a coarsened recrystallized section with a recrystallization ratio of >

10% does not occur in the rib, wherein

the rib is part of a normal section where a recrystallization ratio is ≦

10%, a yield strength of said normal section is 270 MPa or larger, and

a minimum length between a rib end and a through-hole end is 6 mm or larger.

2. The aluminum alloy automobile suspension part according to claim 1 wherein the aluminum alloy is a 6000 series aluminum alloy.