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Variable valve actuation mechanism for an internal combustion engine

A driving mechanism and internal combustion engine technology, applied in the direction of machine/engine, engine components, engine control, etc., can solve the problems of large installation space, variable valve drive mechanism size increase, etc., and achieve the effect of improved compactness

Active Publication Date: 2011-06-29
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a relatively large installation space is required, resulting in an increase in the size of the variable valve drive mechanism.

Method used

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  • Variable valve actuation mechanism for an internal combustion engine
  • Variable valve actuation mechanism for an internal combustion engine
  • Variable valve actuation mechanism for an internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] An exemplary embodiment will be described below with reference to the drawings.

[0047] FIG. 1 is a perspective view showing a variable valve drive mechanism 1 in a simplified manner. The variable valve drive mechanism 1 represents a lift angle variable mechanism. This mechanism opens and closes the respective intake valves 11 in association with the rotational mechanical operation of the crankshaft 50 . Other engine components typically associated with timing belt 52 and crankshaft 50 have been omitted for brevity. Also, the mechanism continuously changes the lift characteristics of the respective intake valves 11 including the valve lift amount and the operating angle thereof. Since the variable valve drive mechanism 1 is a known technology such as JP-A-2005-226543 mentioned above, only an outline description will be given below.

[0048] The variable valve drive mechanism 1 includes a drive shaft 2 , an eccentric drive shaft portion 3 , a control shaft 12 , an ec...

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PUM

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Abstract

A variable valve actuation mechanism for an internal combustion engine includes a drive shaft that rotates in operative association with rotation of a crankshaft, thereby to drive an intake or exhaust valve to open or close by way of a rocker arm; and a control shaft that is rotated by driving of a control shaft actuator and that causes variation of the position of the rocker arm, thereby to cause a lift characteristic of the intake or exhaust valve to be continuously variable. The control shaft includes a flange portion protruding from an outer circumferential surface of the control shaft tothereby regulate movement in an axial direction of the control shaft. A cylinder head rotatably supporting the control shaft includes a flange bearing portion that contacts the flange portion. The flange portion includes a stopper protrusion that protrudes from the flange portion and that contacts the flange bearing portion, thereby to regulate a rotation range of the control shaft.

Description

technical field [0001] The invention relates to a variable valve driving mechanism of an internal combustion engine. Background technique [0002] Generally, a variable valve drive mechanism opens and closes an intake valve or an exhaust valve in association with a rotating mechanical operation of a crankshaft of an internal combustion engine, and changes the lift characteristics of the intake or exhaust valve in combination with the rotation of a control shaft. A variable valve drive mechanism positions a control shaft relative to the orientation of a cylinder bank of an internal combustion engine. Thus, the mechanism includes axial positioning means to maintain the position of the control shaft relative to the cylinder bank of the internal combustion engine. [0003] Japanese Patent Application Publication (JP-A No. 2005-226543) discloses a variable valve drive mechanism. The mechanism includes a stop mechanism for mechanically adjusting the range of rotation of the cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L1/00F01L13/00F02D13/02
CPCF01L13/0026F01L13/0021F01L2001/0476F01L2820/032
Inventor 有马和贵
Owner NISSAN MOTOR CO LTD