Vehicle hood

Patent metadata

Field	Value
Publication number	US-9415812-B2
Application number	US-201514678387-A
Country	US
Kind code	B2
Filing date	Apr 3, 2015
Priority date	Apr 9, 2014
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

An inner panel of a vehicle hood has a 0.2% proof stress of 70 MPa or more and 120 MPa or less after assembling of the inner panel and completion of bake coating. An outer panel has a 0.2% proof stress of 150 MPa or more. The outer panel is made of JIS 5000 or 6000 series aluminum alloy plate material, and the inner panel is made of a JIS 3000 series aluminum alloy plate material. The inner panel has hat-shaped main beads arranged in a center portion. An elongation amount (L−L0)/L0 determined by cross-section line length L of a concave or convex portion of the main bead projected from the surface of the center portion and a line length L0 of a line segment linearly connecting ends of the portion is 0.4 δ to 0.6 δ to a breaking elongation δ in uniaxial tensile deformation.

First claim

What is claimed is:

1. A vehicle hood comprising:
an outer panel; and
an inner panel connected to the outer panel at an edge of the panels, to provide a space therebetween,
wherein a 0.2% proof stress of a material of the inner panel is 70 MPa or more and 120 MPa or less after completion of bake coating of the inner panel subsequently executed after assembling of the vehicle hood, and
wherein a 0.2% proof stress of a material of the outer panel is 150 MPa or more.

2. The vehicle hood according to claim 1 , wherein the outer panel is made of a JIS 5000 or 6000 series aluminum alloy plate material, and the inner panel is made of a JIS 3000 series aluminum alloy plate material.

3. The vehicle hood according to claim 1 ,
wherein the inner panel has a plurality of hat-shaped main beads arranged in a center portion except for an edge thereof,
wherein the main beads are projected in a vehicle upward or downward direction and are arranged in parallel.

4. A vehicle hood comprising:
an outer panel; and
an inner panel,
wherein a 0.2% proof stress of a material of the inner panel is 70 MPa or more and 120 MPa or less after completion of bake coating of the inner panel subsequently executed after assembling of the vehicle hood, and
wherein a 0.2% proof stress of a material of the outer panel is 150 MPa or more,
wherein the inner panel has a plurality of hat-shaped main beads arranged in a center portion except for an edge thereof,
wherein the main beads are projected in a vehicle upward or downward direction and are arranged in parallel,
wherein in a cross-sectional shape orthogonal to each main bead, an elongation amount (L−L0)/L0 determined by a cross-section line length L of a concave portion or a convex portion projected from the surface of the center portion and a line length L0 of a line segment linearly connecting ends of the concave portion or the convex portion is 0.4 δ to 0.6 δ with respect to a breaking elongation δ in uniaxial tensile deformation of the material of the inner panel.

5. The vehicle hood according to claim 4 , wherein the inner panel is made of a JIS 3104 material with a plate thickness of 1.0 mm or less, and
wherein the elongation amount (L−L0)/L0 of the cross section of the concave portion or the convex portion forming the main bead is 0.08 to 0.12.

6. The vehicle hood according to claim 4 , wherein the outer panel is made of a JIS 5000 or 6000 series aluminum alloy plate material, and the inner panel is made of a JIS 3000 series aluminum alloy plate material.

Assignees

• Kobe Steel Ltd

Inventors

• Yoshida Masatoshi
• Ishitobi Hideki
• Oishi Koji
• Yamazaki Tsuyoshi
• Kobori Masao

Classifications

• B62D25/105 Primary

  for motor cars · CPC title

• B60R2021/343

  using deformable body panel, bodywork or components · CPC title

• B62D29/008 Primary

  predominantly of light alloys, e.g. extruded · CPC title