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Valve train for internal combustion engine

一种阀机构、润滑油的技术，应用在机器/发动机、阀细节、阀装置等方向，能够解决阀杆与阀导管摩擦的降低、磨损阀面、难以进一步降低阀杆与阀导管空隙等问题

Inactive Publication Date: 2005-02-16
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In addition, the valve mechanism, especially the engine valves and their surroundings, has the following problems: (1) it is difficult to further reduce the gap between the valve stem and the valve guide, (2) if the lubrication of each valve stem is insufficient, Then sticking or oil loss via the valve guide will occur, (3) the reduction of friction between the valve stem and the valve guide is almost limitless, and (4) the hammering of the valve on the cylinder head seat will wear the valve face

Method used

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  • Valve train for internal combustion engine
  • Valve train for internal combustion engine
  • Valve train for internal combustion engine

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Embodiment Construction

[0017] The present invention will be described in detail below. In the following descriptions, all percentages (%) are expressed by mass unless otherwise specified.

[0018] A valve train including a camshaft of the present invention will be discussed with reference to the drawings.

[0019] like figure 1 and 2 As shown, a camshaft 1 made of iron-based material includes a cam lobe 10 and a camshaft journal 20 . The camshaft 1 rotates by receiving a driving torque of an internal combustion engine (not shown) via a crankshaft (not shown) and a chain (not shown). Each cam lobe 10 pushes each valve lifter 30 downward along the rotation of the camshaft 1 to realize the opening and closing operation of each valve 50 .

[0020] The camshaft 1 rotates while the camshaft journals 20 of the camshaft 1 are supported by cylinder head brackets 120 , respectively. Lubricating oil is applied to a small gap formed between each camshaft journal 20 and each cylinder head bracket 120 to smo...

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Abstract

A valve train for an internal combustion engine is comprised of a lubricating oil, and a camshaft which is made of an iron-based material and comprises a cam lobe and a camshaft journal. The camshaft slidingly moves on a counterpart thereof through the lubricating oil. A hard carbon film is formed on at least one of a sliding portion of the camshaft and the counterpart made of an iron-based material. A hydrogen amount of the hard carbon film is 10 atomic percent or less.

Description

technical field [0001] The present invention relates to a valve mechanism for an internal combustion engine, and more particularly to a valve mechanism in which the sliding parts of the camshaft and the valve and / or its opposing parts are coated with a hard carbon film (coating) such as diamond-like carbon (DLC) film, the mechanism exhibits excellent low-friction properties with the help of specific lubricating oils (lubricants). Background technique [0002] Global environmental problems such as global warming and the destruction of the ozone layer are imminent. Global warming is said to be mainly caused by CO 2 emissions impact. reduce CO 2 emissions, especially to set CO 2 Emission standards have become a major concern of every country. [0003] reduce CO 2 One of the emissions challenges is to improve vehicle fuel efficiency, which primarily involves the sliding parts of the vehicle's engine and its lubricating oil. [0004] The material used for the sliding membe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/04C10M101/02C10M129/70C10M133/06C10M133/56C10M137/10C10M139/00C10M169/06C10N10/04C10N30/06C10N40/25C10N60/14F01L1/047F01L1/14F01L1/18
CPCF01L2101/00F01L1/047F01L2301/00
Inventor 野村绅三浦敬浩加纳真马渕丰浜田孝浩山田美纪
Owner NISSAN MOTOR CO LTD