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Variable valve system

A valve train, variable technology, applied in mechanical equipment, combustion engine, engine control and other directions, can solve problems such as valve body action angle and lift amount changes, and achieve the effect of avoiding the effect of temperature changes

Inactive Publication Date: 2008-08-20
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned variable valve mechanism has disadvantages in that regardless of the state of the control shaft, the operating angle and lift amount of the valve body vary due to the influence of the temperature change around the valve body.

Method used

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  • Variable valve system
  • Variable valve system
  • Variable valve system

Examples

Experimental program
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Effect test

no. 1 example

[0049] [Overall structure of variable valve train]

[0050] Figure 1A and 1B shows the overall structure of the variable valve train according to the first embodiment of the present invention; more specifically, Figure 1A is a plan view representing the entire variable valve train, and Figure 1B is from Figure 1A The side view when viewed from the B direction.

[0051] Figure 1A and 1B The illustrated structure includes a cylinder head 10 of an internal combustion engine. The cylinder head 10 has a plurality of control shaft bearings 11 located on both sides of each cylinder. The control shaft bearing 11 holds the control shaft 12 so that the control shaft 12 can rotate. The internal combustion engine of the present embodiment has four cylinders arranged in series. The control shaft 12 is arranged longitudinally across the four cylinders.

[0052] Each cylinder of the internal combustion engine has an intake valve and an exhaust valve, which are opened / closed synchr...

no. 2 example

[0111] refer to Figure 1A to 5B describe the second embodiment of the present invention. The variable valve mechanism of the second embodiment has the same structure as that of the first embodiment. As far as the mechanism of the first embodiment is concerned, the components used to determine the distance between the control shaft 12 and the camshaft 72, that is, the distance L shown in FIG. The parts are made of materials with different linear expansion rates, and the angle of action can be corrected according to the ambient temperature of the cylinder head 10 to avoid the influence of thermal expansion and thermal contraction.

[0112] However, in the case of the variable valve mechanism of the second embodiment, the part for determining the distance L (that is, the cylinder head 10), and the part between the control shaft 12 and the camshaft 72 (that is, the first arm part) 44 and the second arm member 46) are made of materials with the same linear expansion rate to avoid...

no. 3 example

[0116] A third embodiment of the present invention is described with reference to FIGS. 8 to 10 . The variable valve mechanism of the third embodiment has the same structure as that of the first embodiment.

[0117] [Problems of the variable valve mechanism according to the present embodiment]

[0118] In order to properly operate the internal combustion engine, it is necessary to properly set the operating angle and the lift amount according to the operating state of the internal combustion engine. More specifically, when the internal combustion engine is started, it is necessary to set the operating angle and lift amount to be suitable for starting. However, when the internal combustion engine is stopped, the operating angle and the lift amount are not always set to a state suitable for starting the internal combustion engine. Therefore, for an internal combustion engine equipped with a variable valve train, it is necessary to correct the operating angle and lift amount wi...

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Abstract

A first arm member and a second arm member are provided. The first arm member is positioned between a cam and a valve body to oscillate in synchronism with the rotation of the cam. The second arm member changes the angle of the first arm member in accordance with the rotation angle of a control shaft. The temperature prevailing in the neighborhood of the control shaft and cam is detected. The rotation angle of the control shaft is corrected so as to avoid the influence of the detected temperature.

Description

technical field [0001] The present invention relates to a variable valve mechanism, in particular to a variable valve mechanism of an internal combustion engine capable of changing valve operating angle and lift, wherein the opening of the valve is synchronized with the rotation of the camshaft. Background technique [0002] For example, in Japanese Patent Laid-Open No. 63023 / 1995, there is disclosed a conventional variable valve mechanism that changes the lift amount of a valve body in an internal combustion engine equipped with a valve body whose opening / closing and The camshafts rotate synchronously. The variable valve mechanism is provided with a swing arm disposed between the cam and the valve body, and the swing arm swings synchronously with the operation of the cam. The swing arm is arranged in the internal combustion engine such that its substantially relative angle to the valve body is variable. Also, the mechanism includes a lost motion spring and an adjustment m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L13/00F02D13/02
CPCY02T10/18
Inventor 浅田俊昭江崎修一立野学
Owner TOYOTA JIDOSHA KK
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