JPH0224013U

JPH0224013U -

Info

Publication number: JPH0224013U
Application number: JP10210988U
Authority: JP
Priority date: 1988-08-01
Filing date: 1988-08-01
Publication date: 1990-02-16

Description

[Brief explanation of drawings]

図面は本考案の一実施例を示すもので、第１図
は内燃機関の要部縦断面図であつて第２図の―
線断面図、第２図は第１図の―線矢視図、
第３図は第２図の―線断面図、第４図は第１
図の―線断面図、第５図は第２図の―線
断面図、第６図は連結切換機構を示すための横断
面図、第７図は給油系統を示す図、第８図は第２
図の―線矢視図、第９図は第８図の―線
断面図、第１０図は第８図の―線に沿う切換
弁閉弁時の拡大断面図、第１１図はハウジングお
よびスプール弁体間のクリアランスの作動速度に
及ぼす影響を示すグラフ、第１２図は上記クリア
ランスの給油路油圧に及ぼす影響を示すグラフ、
第１３図は温度変化による給油路油圧に及ぼす影
響を示すグラフ、第１４図は本考案に従う材質選
定に伴うクリアランスの温度による変化を示すグ
ラフ、第１５図は第２図の―線断面図、
第１６図は切換弁開弁時の第１０図に対応した断
面図である。１０ｉ……機関弁としての吸気弁、１０ｅ……
機関弁としての排気弁、１７ｉ，１７ｅ……動弁
装置、２２ｉ，２２ｅ……ロツカシヤフト、２３
ｉ，２３ｅ，２４ｉ，２４ｅ，２５ｉ，２５ｅ…
…ロツカアーム、２６ｉ，２６ｅ……油圧式連結
切換機構、５８ｉ，５８ｅ……給油路、６４……
油圧供給源としてのオイルポンプ、６９……切換
弁、９１……ハウジング、９２……スプール弁体
、９５……作動油圧室。 The drawings show one embodiment of the present invention, and FIG. 1 is a vertical sectional view of the main part of an internal combustion engine, and FIG.
Line sectional view, Figure 2 is a - line arrow view of Figure 1,
Figure 3 is a cross-sectional view taken along the line - in Figure 2, and Figure 4 is a cross-sectional view of Figure 1.
Figure 5 is a cross-sectional view taken along the line - in Figure 2, Figure 6 is a cross-sectional view showing the connection switching mechanism, Figure 7 is a diagram showing the oil supply system, and Figure 8 is a cross-sectional view taken along the line - in Figure 2. 2
Fig. 9 is a sectional view taken along the - line in Fig. 8, Fig. 10 is an enlarged sectional view taken along the - line in Fig. 8 when the switching valve is closed, and Fig. 11 shows the housing and spool. A graph showing the effect of the clearance between the valve bodies on the operating speed, FIG. 12 is a graph showing the effect of the clearance on the oil supply passage oil pressure,
Fig. 13 is a graph showing the influence of temperature changes on oil supply passage oil pressure, Fig. 14 is a graph showing changes in clearance due to temperature due to material selection according to the present invention, Fig. 15 is a cross-sectional view taken along the line - - in Fig. 2,
FIG. 16 is a sectional view corresponding to FIG. 10 when the switching valve is open. 10i... Intake valve as engine valve, 10e...
Exhaust valve as engine valve, 17i, 17e...Valve train, 22i, 22e...Rock shaft, 23
i, 23e, 24i, 24e, 25i, 25e...
...Lotsuka arm, 26i, 26e...Hydraulic connection switching mechanism, 58i, 58e...Oil supply path, 64...
Oil pump as a hydraulic pressure supply source, 69... switching valve, 91... housing, 92... spool valve body, 95... working hydraulic chamber.

Claims

[Scope of utility model registration request]

A fixed locking shaft supports multiple locking arms to open and close the engine valve, and these locking arms are equipped with a hydraulic connection switching mechanism that can connect and disconnect each other according to the operating state of the engine. An oil supply passage leading to the hydraulic connection switching mechanism is provided in the rock shaft, and a passageway is provided between the oil supply passage and the hydraulic pressure supply source, with one end facing the working hydraulic pressure chamber and biased by a spring toward the other end. In a valve train for an internal combustion engine in which a switching valve is provided, the switching valve has a spool valve body slidably fitted into a housing, and the housing of the switching valve has a coefficient of thermal expansion larger than that of the material forming the spool valve body. A valve train for an internal combustion engine, characterized in that it is formed of a material having: