CYLINDER HEAD GASKET

• US 20140265155A1
• Filed: 03/02/2012
• Published: 09/18/2014
• Est. Priority Date: 11/02/2011
• Status: Active Grant

• Current Assignee: NOK Corporation
• Original Assignee: NOK Corporation
• Inventors: Osawa, Namieki, Gushiken, Misaki
• Granted Patent: US 9,500,157 B2
• Time in Patent Office: Days
• US Class Current: 277/594
• CPC Class Codes: F02F 11/002 involving cylinder heads
• CPC Class Codes: F16J 15/064 the packing combining the sealing function with other functions
• CPC Class Codes: F16J 15/08 with exclusively metal packing
• CPC Class Codes: F16J 15/0818 Flat gaskets

Abstract

The purpose of the invention is to make it possible to perform pressurized leak tests on open loop chain case-side oil seal beads. The purpose is achieved with a cylinder head gasket, which is fitted between the cylinder block and the cylinder head and seals the three-surface sealing region obtained by combining the cylinder block, the cylinder head and the chain case, and in which an open-loop chain case-side oil seal bead that is open toward the chain case is provided in the chain case-side end of the gasket. The cylinder head gasket is characterized in that a closed-loop leak test bead is provided in the cylinder head gasket along a chain case-side oil seal bead and a leak test pressure supply path for supplying leak test pressure to the space enclosed by the leak test bead is provided.

Claims

1. A cylinder head gasket installed between a cylinder block and a cylinder head and sealing a three-surface sealing portion which is constructed by a combination of said cylinder block, the cylinder head and a chain case, comprising:

an open-loop chain case side oil seal bead which is provided in a chain case side end portion in said gasket and is open toward said chain case side,

wherein a closed-loop leak test bead is provided along said chain case side oil seal bead, and a leak test pressure supply path is provided so as to supply a leak test pressure toward a space area which is surrounded by said leak test bead.

2. The cylinder head gasket according to claim 1, wherein said leak test pressure supply path is constructed by a pressure supply hole which is provided so as to pass through said gasket in a thickness direction.