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Iron-based sintered alloy valve seat

An iron-based sintering and alloying technology, which is applied in the direction of lifting valves, valve devices, machines/engines, etc., can solve the problems of insufficient wear resistance and low strength of sintered body, so as to improve wear resistance and softening resistance performance, excellent wear resistance

Inactive Publication Date: 2013-09-25
RIKEN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in a valve seat made of a conventional iron-based sintered alloy in which a large amount of calcium fluoride is dispersed in the matrix as a solid lubricant, the strength of the sintered body becomes low, and the wear resistance in the low temperature range is insufficient. Problematic in applications over a wide operating temperature range
In addition, the wear resistance of the conventional iron-based sintered alloy valve seat containing only molybdenum-iron alloy as hard particles is insufficient in a wide operating temperature range.

Method used

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  • Iron-based sintered alloy valve seat
  • Iron-based sintered alloy valve seat
  • Iron-based sintered alloy valve seat

Examples

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Effect test

Embodiment 1～5

[0027] Examples 1-5 (E1-E5) and Comparative Examples 1-6 (C1-C6)

[0028] In the ratio (mass%) shown in Table 4, the pure iron powder having a peak at the particle size distribution of 150 to 200 mesh and / or including Mo: 2.5%, Si: 1%, C: 0.02%, and the remainder is The pre-alloy powder containing iron (including unavoidable impurities) contains the following substances, that is, Mo powder, Si powder, Ni powder, and graphite powder as shown in Table 1. Amount; the first hard particle of L~R of the Fe-Mo-Si alloy shown in Table 2 and the second hard particle of S~Y of the Fe-C-Cr-Mo-V alloy shown in Table 3; and the solid lubricant powder shown in Table 4 were mixed in a mixer to prepare a mixed powder.

[0029] [Table 1]

[0030]

[0031] * Use prefabricated alloy powder

[0032] [Table 2]

[0033]

[0034] [table 3]

[0035]

[0036] [Table 4]

[0037]

[0038] * The average particle diameter of the solid lubricant was 7 μm for MnS and 10 μm for BN.

[00...

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Abstract

The purpose of the present invention is to provide an iron-based sintered alloy valve seat that can be used in a DI-type internal combustion engine adapted for enhanced fuel economy, lower emissions, and higher output, the seat being highly wear-resistant across a wide temperature range. To achieve this purpose, the added amount of a solid lubricant dispersed in a base material for the iron-based sintered alloy valve seat is limited, and at least two types of hard particles of different hardness levels are dispersed in the base material, whereby high strength and self-lubricating properties are simultaneously obtained, and wear resistance is improved across a wide temperature range, even under no lubrication.

Description

technical field [0001] The present invention relates to a valve seat of an internal combustion engine, and more particularly to a valve seat made of iron-based sintered alloy used under conditions where the lubrication state is lean due to fuel injection in a cylinder. Background technique [0002] In internal combustion engines, in consideration of environmental response, improvement of fuel consumption, low emission, and high output are sought, and due to high loads of combustion states and high loads of engine specifications, the components constituting the combustion chamber are required to be in a wide range. The wear resistance is further improved in the operating temperature range. The valve seat of the intake valve and the exhaust valve, which has the function of keeping the combustion chamber airtight, is also exposed to the combustion pressure during combustion, and is repeatedly subjected to strong impact by the reciprocating motion of the valve. In addition, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L3/02B22F1/00B22F5/00C22C27/04
CPCC22C27/04F01L1/0532F01L1/143F01L2800/18F01L2810/02F01L2820/01B22F5/008C22C33/0207C22C33/0221C22C33/0228C22C38/02C22C38/08C22C38/12C22C38/22C22C38/24F01L3/02F01L2303/00
Inventor 高桥林太郎逸见浩二鹿内周一
Owner RIKEN CO LTD
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