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Valve seat insert for long life natural gas lean burn engines

A technology of inserts and valve seats, which is applied to engine components, combustion engines, internal combustion piston engines, etc., can solve the problems of no disclosure and prolong the life of valve seats.

Pending Publication Date: 2021-02-23
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this reference does not disclose how to extend the life of the valve seat while maintaining desired engine performance

Method used

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  • Valve seat insert for long life natural gas lean burn engines
  • Valve seat insert for long life natural gas lean burn engines
  • Valve seat insert for long life natural gas lean burn engines

Examples

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Embodiment Construction

[0020] Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. In some cases, reference numerals will be indicated in this specification, and the drawings will show some reference numerals followed by a letter, for example, 100a, 100b, or followed by an apostrophe designator, such as 100', 100", etc. Should It is understood that the use of a letter or apostrophe immediately after a reference number indicates that these features are of similar shape and have a similar function, as is often the case, for example, when the geometry is mirrored about a plane of symmetry. For ease of explanation in this specification, the letters Or apostrophes are generally not included herein, but may be shown in the drawings, indicating repetition of features discussed in this written description.

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PUM

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Abstract

The invention relates to a valve seat insert for a long life natural gas lean burn engine. The valve seat insert of an engine has a valve seating surface including an outer curved segment forming a first wear crown for contacting the valve at an early wear state, an inner curved segment forming a second wear crown for contacting the valve at a later wear state, and a linear segment extending between the outer and the inner curved segments. A top flow crown is set off radially inward from the engine head, and a sloping segment extending from the top flow crown is oriented at an acute angle relative to the valve seat center axis.

Description

technical field [0001] The present invention relates generally to engine valves and associated hardware, and more particularly to a valve seat insert for an intake or exhaust valve configured to provide long life to an internal combustion engine natural gas lean burn. Background technique [0002] Gas exchange valves are used in internal combustion engines to control the fluid connection between a cylinder and the intake air or intake air and other gases such as recirculated exhaust gas, or between the cylinder and the exhaust manifold to discharge during operation products of combustion. Designs are known in which a single intake valve and a single exhaust valve are associated with each cylinder in the engine, as well as in which multiple gas exchange valves of each respective type are associated with each cylinder. The camshaft, which normally rotates at half the engine speed, is coupled with valve lifters, cross arms, rocker arms and / or other devices for controlling the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L3/22F01L3/06
CPCF01L3/22F01L3/06F16K1/42F16K47/00F01L2820/01F01L2303/00Y02T10/12F01L3/20
Inventor A·A·哈提亚加迪P·D·斯莫利奇R·瞿
Owner CATERPILLAR INC