Cylinder block manufacturing method and cylinder block

Patent metadata

Field	Value
Publication number	US-9494103-B2
Application number	US-201214366506-A
Country	US
Kind code	B2
Filing date	Nov 5, 2012
Priority date	Dec 22, 2011
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

A cylinder block manufacturing method including: machining an inner surface of a cylinder bore ( 3 ) of a cylinder block ( 1 ) into a first shape different from a target shape before a bearing cap ( 7 ) is attached to the cylinder block ( 1 ) so that the inner surface of the cylinder bore ( 3 ) is deformed into the target shape by attachment of the bearing cap ( 7 ) to the cylinder block ( 1 ); and forming a thermal spray coating ( 5 ) on the inner surface of the cylinder bore ( 3 ) having the first shape.

First claim

The invention claimed is:

1. A manufacturing method for a cylinder block of a V engine comprising:
a casting step of casting a cylinder block of a V engine;
a thermal spraying step following the casting step;
an attachment step of attaching a bearing cap to the cylinder block after the thermal spraying step; and
a finishing process step, after the attachment step, of performing a finishing process on a thermal spray coating formed on an inner surface of a cylinder bore having a target shape,
the thermal spraying step comprising:
machining the inner surface of the cylinder bore into a first shape different from the target shape; and
forming the thermal spray coating on the inner surface of the cylinder bore having the first shape.

2. The manufacturing method for a cylinder block of a V engine according to claim 1 , further comprising:
performing a rough finishing process on the thermal spray coating by using a rough-finishing tool which is rigidly connected to and driven and rotated by a driving unit.

3. The manufacturing method for a cylinder block of a V engine according to claim 1 , wherein
the target shape is a cylindrical shape having a predetermined cylindricity, and
the first shape is a shape having an elliptical or oval shape in a section thereof which is taken at a middle position of the cylinder bore in an axial direction thereof and perpendicular to the axial direction of the cylinder bore.

Assignees

• Nissan Motor

Inventors

• Miwa Hirotaka
• Watanabe Takafumi
• Sugiyama Kiyokazu
• Hayashi Mitsuo
• Terada Daisuke
• Noshi Yoshitsugu
• Shiotani Eiji
• Miyamoto Yoshiaki
• Taniguchi Kazuaki

Classifications

• C23C4/02 Primary

  Pretreatment of the material to be coated, e.g. for coating on selected surface areas · CPC title

• F02F7/0095

  Constructing engine casings (welded casings F02F7/0034) · CPC title

• F02F7/0053

  Crankshaft bearings fitted in the crankcase · CPC title

• F05C2253/12

  Coating · CPC title

• C23C4/18

  After-treatment · CPC title