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Exhaust valve seat for automobile engine

A technology for automobile engines and exhaust valves, applied to engine components, machines/engines, mechanical equipment, etc., can solve problems such as increased tool wear, increased scrap rate and cost, and reduced tool life, achieving production cost advantages and low cost Effect

Inactive Publication Date: 2010-05-12
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In response to this high requirement, copper-infiltrated exhaust valve seats are generally used, and the proportion of copper in the material reaches more than 10%. However, due to the influence of the copper-infiltrated process, the hardness of the exhaust valve seat will increase, and the hardness can reach 45HRC. , and the 3-blade combination tool generally used in machining to process the exhaust valve seat and the conduit hole, this high-hardness material will cause increased tool wear and reduce tool life, and the copper infiltration process also increases the scrap rate and cost

Method used

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  • Exhaust valve seat for automobile engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: adopt the material of following chemical composition content to make engine exhaust valve seat: (weight percentage)

[0015] C: 1.08%, Mo: 6.58%, Cr: 3.5%, Co: 5.51%, Ni: 2.28%, V: 0.72%, Cu0.56%, and the rest Fe.

[0016] The production process is:

[0017] Ingredients → forming → sintering → machining → external inspection → packaging.

[0018] 250 times the metallographic structure of the exhaust valve seat made by figure 1 shown.

Embodiment 2

[0019] Example 2: C: 1.12%, Mo: 6.6%, Cr: 3.55%, Co: 5.54%, Ni: 2.31%, V: 0.7%, Cu0.55%, and the rest Fe.

[0020] The manufacturing process is the same as example 1.

[0021] The above-mentioned exhaust valve seat is suitable for high-performance supercharged engines with a displacement of 1.8L and above, and has the characteristics of low cost and high performance.

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PUM

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Abstract

The invention relates to an exhaust valve seat for an automobile engine, which is made of a material containing chemical compositions. The material comprises the following chemical compositions in percentage by weight: 0.7 to 1.4 percent of C, 3.0 to 6.6 percent of Mo, 3.0 to 6.6 percent of Cr, 5.0 to 8.5 percent of Co, 1.2 to 3.0 percent of Ni, 0.2 to 1.0 percent of V, less than or equal to 1.0 percent of Cu, and the balance of Fe. The exhaust valve seat made of the material has high crushing strength and fatigue strength and reliable quality, has lower cost than a copper-infiltrated valve seat, and meets the requirements of high-performance engines.

Description

technical field [0001] The invention relates to an exhaust valve seat for an automobile engine. Background technique [0002] The exhaust valve seat is an important part of the engine. It must not only cooperate with the intake port to form an airflow that is conducive to combustion, but also form a seal with the valve and be resistant to high temperature, high pressure and wear. Especially for CNG gas engines and supercharged engines, the exhaust valve seat has higher requirements because there is no lubrication of fuel and volatilization and heat absorption. When the exhaust valve reaches 900°C, the temperature of the exhaust valve seat can reach 400°C. [0003] In response to this high requirement, copper-infiltrated exhaust valve seats are generally used, and the proportion of copper in the material reaches more than 10%. However, due to the influence of the copper-infiltrated process, the hardness of the exhaust valve seat will increase, and the hardness can reach 45HRC...

Claims

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Application Information

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IPC IPC(8): F01L3/02
Inventor 王锐韦颂陈彦成卫国
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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