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intake valve of internal combustion engine

An internal combustion engine and intake valve technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problems of intake valve accumulation, small self-cleaning function, and limited deposit reduction effect.

Active Publication Date: 2020-07-07
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if there is a step in the valve head where deposits may adhere and accumulate, deposits tend to accumulate on the stepped part, so the effect of reducing deposits by coating is limited
Especially in an internal combustion engine using gaseous fuel, the so-called self-cleaning function is small compared to the inhaled fuel as liquid fuel, so deposits tend to accumulate on the intake valve

Method used

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  • intake valve of internal combustion engine
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  • intake valve of internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0059] refer to figure 1 and figure 2 , the intake valve of the internal combustion engine according to the first embodiment of the present invention will be described. figure 1 It is a sectional view of the intake valve of the internal combustion engine of the first embodiment. figure 2 It is an enlarged sectional view of main parts of the intake valve of the first embodiment.

[0060] Such as figure 1As shown, the intake valve 10 of the internal combustion engine 1 is provided to open and close the intake port 2m of the intake port 2 of the cylinder head 1a. The intake valve 10 has a valve head 15 and a valve shaft portion 11, the valve head 15 corresponds to the intake port 2m, the intake port 2m communicates with the combustion chamber 5 of the internal combustion engine 1, and the valve shaft portion 11 is arranged to cross the intake port 2 And protrude outward from the cylinder head 1a. The valve shaft portion 11 is supported by the shaft guide 4 so as to recipro...

no. 2 approach

[0071] image 3 It is an enlarged cross-sectional view of main parts of the intake valve of the second embodiment. The intake valve 10A of the second embodiment differs from the intake valve 10 of the first embodiment in the structure of the stepped portion 14A and the coating 20A. Except for this point, similar to the first embodiment, in image 3 in, right with figure 1 or figure 2 The same reference signs are assigned to common components.

[0072] Such as image 3 As shown, the step portion 14A of the present embodiment is formed in a two-stage step shape, and has a first boundary portion 14a, a second boundary portion 14b, a third boundary portion 14c, and a fourth boundary portion 14d. On the step portion 14A, between the first boundary portion 14a and the third boundary portion 14c, an inclined flat surface 14f having an inclination angle smaller than that of the umbrella-shaped inclined portion 12 is formed, and between the fourth boundary portion 14d and the sec...

no. 3 approach

[0077] Figure 4 It is an enlarged cross-sectional view of main parts of an intake valve according to a third embodiment. The intake valve 10B of the third embodiment differs from the intake valve 10 of the first embodiment in the structure of the umbrella-shaped inclined portion 12B and the coating 20B. Except for this point, similar to the first embodiment, in Figure 4 in, right with figure 1 or figure 2 The same reference signs are assigned to common components.

[0078] Such as Figure 4 As shown, the entire surface of the umbrella-shaped inclined portion 12B in this embodiment other than the stepped portion 14 is formed as a curved surface that is concave toward the front end surface side of the valve head 15 . In this embodiment, as in the first embodiment, an oil-repellent coating is formed on the umbrella-shaped inclined portion 12B including the stepped portion 14 and a part of the surface of the valve shaft portion 11 connected to the umbrella-shaped inclined ...

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PUM

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Abstract

An intake valve 10 of an internal combustion engine, eg a gas-fuelled engine, has an uneven portion 14 formed on a flared slope portion 12 having a slope which gradually expands from the valve stem (11, fig.1) toward the valve seat portion13, and in which a slope angle of the flared slope portion 12 changes at the uneven portion 14. An oil-repellent coating layer 20, eg with fluorine, is formed on at least part of the flared slope portion 12 including the uneven portion 14 to level unevenness at the uneven portion 14 to reduce deposits where they might otherwise adhere or accumulate. The coating layer 20 may be applied also to part of the valve stem 11. The thickness of the coating layer 20 may change between the uneven portion 14 and the valve stem. The uneven portion (14A, fig.3) may comprise two steps. The flared slope portion (12B, fig.4) may be concave.

Description

technical field [0001] The invention relates to an intake valve of an internal combustion engine. Background technique [0002] It is known that, in an intake valve of an internal combustion engine, deposits adhere to or accumulate on a valve tip portion that opens and closes a combustion chamber. Deposits are deposited due to the adhesion of engine oil and the like to the valve shroud, which increases in viscosity in the high-temperature environment of engine combustion, etc., and solidifies and accumulates over time. If deposits accumulate on the intake valve, not only the air intake performance associated with the reduction of the surface of the valve will be reduced, but also the deposits peeled off due to the reciprocating action of the valve will adhere to the valve sealing part to reduce the sealing performance and cause The engine output is lowered, so it is not preferable. [0003] In the valve described in Patent Document 1, in order to reduce deposits that adher...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L3/04F01L3/20
CPCF01L3/04F01L3/20F01L3/00
Inventor 丸山胜巳石川武由利信行清水元寿
Owner HONDA MOTOR CO LTD
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