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Valve lifter for internal combustion engine

A technology for internal combustion engines and valves, which is applied to mechanical equipment, engine components, machines/engines, etc. It can solve problems such as increased pressure on the drive cam surface, wear, and affect the free rotation of valve tappets, so as to reduce friction and wear. Effect

Inactive Publication Date: 2012-04-18
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the valve lifter described in the above-mentioned patent document 2, if the crowning amount of the crown surface is too large, the free rotation of the valve lifter will be affected during the working process, and the driving cam is in the sliding position. Increased surface pressure and possible localized wear

Method used

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  • Valve lifter for internal combustion engine
  • Valve lifter for internal combustion engine
  • Valve lifter for internal combustion engine

Examples

Experimental program
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Embodiment Construction

[0025] Hereinafter, the implementation method of the valve lifter of the internal combustion engine of the present invention will be described in detail with reference to the accompanying drawings.

[0026] figure 2 Indicates main parts of an internal combustion engine to which the valve lifter of the present invention is applied, for example, the intake side and the exhaust side for a four-cylinder four-stroke gasoline engine.

[0027] In this internal combustion engine, an intake valve 4 and an exhaust valve 5 that open and close an intake port 2 formed inside a cylinder head 1 are slidably provided through valve guides 6a, 6b. And the valve of the air outlet 3, and each cylinder has two intake valves 4 and exhaust valves 5 respectively. In addition, drive cams for opening the intake valves 4 and exhaust valves 5 are integrally provided on the outer peripheral surfaces of the intake-side and exhaust-side camshafts 7, 8 supported on the upper end of the cylinder head 1 by c...

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PUM

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Abstract

A valve lifter for an internal combustion engine includes a skirt portion formed in a tubular shape; and a crown portion formed integrally with an axially one end side of the skirt portion. The crown portion includes a crown surface configured to slide in contact with an outer circumferential surface of a cam. An axis of the crown portion is eccentric from a center of the cam in a width direction of the cam. The crown surface is formed in a spherical protruding shape to have its uppermost portion at a center of the crown surface. A protruding amount of the spherical protruding shape is set to range from 11 [mu]m to 50 [mu]m.

Description

technical field [0001] The present invention relates to the improvement technology of the valve tappet of the internal combustion engine. Background technique [0002] As well known, as a valve lifter that transmits the rotation of the camshaft of a four-stroke internal combustion engine to the intake valve and the exhaust valve, for example, a valve lifter as described in Patent Document 1 is disclosed, which is formed approximately in a circle with a cover. On the flat crown surface of the crown part integrally formed on the upper end of the cylindrical skirt, the driving cam of the camshaft rotates and slides, and converts the rotational force into a reciprocating motion, and then transmits it to the The intake valve and exhaust valve. [0003] However, since the crown surface is formed flat, there arises a technical problem that the frictional force when the drive cam slides becomes large. [0004] Therefore, for example, a valve lifter described in Patent Document 2 h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/16
CPCF01L2820/045F01L3/085F01L1/143
Inventor 田中智也保阪宪臣鹤田诚次
Owner HITACHI AUTOMOTIVE SYST LTD