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Patent Searching and Data


Title:
VALVE SEAT AND VALVE SEAT MATERIAL
Document Type and Number:
WIPO Patent Application WO/2019/151322
Kind Code:
A1
Abstract:
This valve seat is press-fit into a cylinder head for an internal combustion engine and comes into contact with a valve. The outer peripheral surface of the valve seat is provided with a rough surface region having a portion with recesses and protrusions. At least part of the rough surface region extends, starting from the end of the valve seat which is on the front side in the direction in which the valve seat is press-fit into the cylinder head (the end being hereinafter referred to as valve seat front-side end), in the press-fitting direction within a range having a length 4/5 the overall length of the valve seat in the press-fitting direction. As a result, even if a location where a structure which does not easily become dislodged from the cylinder head for the internal combustion engine is provided extends to the rear end side in the direction of press-fitting of the valve seat, the valve seat can be efficiently press-fit into the cylinder head.

Inventors:
SUWA KIYOSHI (JP)
NAGAOKA YUJI (JP)
Application Number:
JP2019/003158
Publication Date:
August 08, 2019
Filing Date:
January 30, 2019
Export Citation:
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Assignee:
NIPPON PISTON RING CO LTD (JP)
International Classes:
F01L3/02; F01L3/22
Foreign References:
JPS62261609A1987-11-13
US20130269647A12013-10-17
CN105065076A2015-11-18
Attorney, Agent or Firm:
SAHARA Masashi et al. (JP)
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