JPH024909U

JPH024909U -

Info

Publication number: JPH024909U
Application number: JP8258788U
Authority: JP
Priority date: 1988-06-22
Filing date: 1988-06-22
Publication date: 1990-01-12
Anticipated expiration: 2003-06-22
Also published as: JPH0634563Y2

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図は第２図の
―線断面図、第１２図は切換弁開弁時の第１
０図に対応した断面図である。１……シリンダブロツク、２……シリンダ、３
……シリンダヘツド、１０ｉ……吸気弁、１０ｅ
……排気弁、１８ｉ，１８ｅ……カムシヤフト、
１８ｉ′，１８ｅ′……カムジヤーナル部、１９
ｉ，１９ｅ，２０ｉ，２０ｅ……低速用カム、２
１ｉ，２１ｅ……高速用カム、２２ｉ，２２ｅ…
…ロツカシヤフト、２３ｉ，２３ｅ，２４ｉ，２
４ｅ，２５ｉ，２５ｅ……ロツカアーム、２６ｉ
，２６ｅ……連結切換機構、２９，３０……カム
ホルダ、５８ｉ，５８ｅ……給油路、６９……切
換弁、７８……低速用油圧供給路、８０……分岐
油路、８６……高速用油圧供給路、８７……給油
口、８８……連通路。 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
Figure 9 is a sectional view taken along the line - in Figure 8, Figure 10 is an enlarged sectional view taken along the line - in Figure 8 when the switching valve is closed, and Figure 11 is the view in Figure 2. Figure 12 is a cross-sectional view of
FIG. 2 is a sectional view corresponding to FIG. 1...Cylinder block, 2...Cylinder, 3
...Cylinder head, 10i...Intake valve, 10e
...Exhaust valve, 18i, 18e...Camshaft,
18i', 18e'...cam journal part, 19
i, 19e, 20i, 20e...Low speed cam, 2
1i, 21e...high speed cam, 22i, 22e...
...Lotsukashaft, 23i, 23e, 24i, 2
4e, 25i, 25e...Lotsuka arm, 26i
, 26e... Connection switching mechanism, 29, 30... Cam holder, 58i, 58e... Oil supply path, 69... Switching valve, 78... Hydraulic pressure supply path for low speed, 80... Branch oil path, 86... For high speed Hydraulic supply path, 87... Oil supply port, 88... Communication path.

Claims

[Scope of utility model registration request]

A plurality of cylinders are arranged in series in the cylinder block, and a pair of mutually parallel camshafts are rotatably supported on both sides of each cylinder along the cylinder arrangement direction by a cylinder head and a cam holder fastened to the cylinder head. A plurality of cams including a low-speed cam and a high-speed cam are fixed adjacent to each other and correspond to each cylinder,
A pair of rocker shafts fixedly supported by the cylinder head support a plurality of rocker arms corresponding to the intake valve and exhaust valve of each cylinder so as to be in sliding contact with each cam. A lubricating oil supply system for a DOHC multi-cylinder internal combustion engine is provided with a connection switching mechanism capable of switching mutual connection and disconnection according to oil pressure in order to change the operation mode of an intake valve and an exhaust valve according to the state, In the cylinder head, a low-speed hydraulic pressure supply path is provided approximately in the center along the direction in which each cylinder is arranged, and a high-speed hydraulic pressure supply path that opens at one end surface along the direction in which each cylinder is arranged serves as a low-speed hydraulic pressure supply path. are provided independently, and the cam holder located approximately in the center along the arrangement direction of each cylinder has a sliding contact portion between the cam including at least the low-speed cam of each cylinder on the intake side and the exhaust side and the rocker arm, and a cam of the camshaft. A branch oil path communicating with the low-speed hydraulic pressure supply path is provided to supply oil to the journal portion, and is divided into an intake side and an exhaust side,
Inside both rocker shafts, oil supply passages are provided coaxially to supply oil to each coupling switching mechanism and the sliding contact parts of the high-speed cam and rocker arm.Both oil supply passages are provided at the cylinder head near one end along the arrangement direction of each cylinder. At the same time, an oil supply port is provided that communicates with one of the oil supply passages and opens at one end surface of the cylinder head, and an opening for the high-speed hydraulic pressure supply passage and an oil supply port are provided at one end surface of the cylinder head. A lubricating oil supply system for a DOHC multi-cylinder internal combustion engine, characterized in that a switching valve capable of switching between communication and isolation between ports is installed.