JPH0317207U

JPH0317207U -

Info

Publication number: JPH0317207U
Application number: JP7724589U
Authority: JP
Priority date: 1989-06-30
Filing date: 1989-06-30
Publication date: 1991-02-20
Anticipated expiration: 2004-06-30
Also published as: JPH077524Y2

Description

[Brief explanation of drawings]

第１図は、本考案を適用した内燃機関の動弁機
構を示す側面図である。第２図は、連結切換装置
の構造及び動弁機構の給油系統を示す回路図であ
る。第３図は、本考案の第２実施例を概略的に示
す第２図と同様の回路図である。１…シリンダヘツド、２ａ，２ｂ…吸気弁、３
…カム軸、４ａ，４ｂ…低速用カム、５…高速用
カム、６…ロツカシヤフト、７〜９…ロツカアー
ム、７ａ〜９ａ…カムスリツパ、１０ａ，１０ｂ
…タペツトねじ、１１ａ，１１ｂ…リテーナ、１
２ａ，１２ｂ…バルブスプリング、１３…管路部
材、１４…低速用潤滑路、１５…高速用潤滑路、
１６，１７ａ，１７ｂ，１８…潤滑油噴出孔、２
１…連結切換装置、２２…第１ガイド孔、２３…
第１切換ピン、２４…第２ガイド孔、２５…第２
切換ピン、２６…第３ガイド孔、２７…ストツパ
ピン、２８…リターンスプリング、３１…第１給
油通路、３２…第２給油通路、３３，３４…油路
、３５…リーク孔、３６…第１切換制御弁、３７
…第２切換制御弁、３８…メインオイルギヤラリ
、３９…オイルパン、４０…オイルポンプ、４１
…リリーフ弁、４２…第１流量調整手段、４３…
第２流量調整手段、４４…カムジヤーナル、４５
，４６…通路、４７…潤滑油噴出孔。 FIG. 1 is a side view showing a valve mechanism for an internal combustion engine to which the present invention is applied. FIG. 2 is a circuit diagram showing the structure of the connection switching device and the oil supply system of the valve mechanism. FIG. 3 is a circuit diagram similar to FIG. 2 schematically showing a second embodiment of the present invention. 1...Cylinder head, 2a, 2b...Intake valve, 3
...Camshaft, 4a, 4b...Low speed cam, 5...High speed cam, 6...Rock shaft, 7-9...Rock arm, 7a-9a...Cam slipper, 10a, 10b
... Tappet screw, 11a, 11b ... Retainer, 1
2a, 12b...Valve spring, 13...Pipe line member, 14...Low speed lubrication path, 15...High speed lubrication path,
16, 17a, 17b, 18...Lubricating oil jet hole, 2
1... Connection switching device, 22... First guide hole, 23...
First switching pin, 24...Second guide hole, 25...Second
Switching pin, 26... Third guide hole, 27... Stopper pin, 28... Return spring, 31... First oil supply passage, 32... Second oil supply passage, 33, 34... Oil passage, 35... Leak hole, 36... First switching control valve, 37
...Second switching control valve, 38...Main oil gear gallery, 39...Oil pan, 40...Oil pump, 41
...Relief valve, 42...First flow rate adjustment means, 43...
Second flow rate adjustment means, 44... cam journal, 45
, 46...Passage, 47...Lubricating oil spout hole.

Claims

[Claims for Utility Model Registration] (1) A cam that rotates in synchronization with a crankshaft to open and close an intake valve or an exhaust valve, and a cam that is arranged adjacent to each other so as to be relatively displaceable in order to transmit the lift of the cam to the valve. A valve operating mechanism for an internal combustion engine, comprising a plurality of cam followers, a valve operating state switching device that changes the valve operating state by the action of hydraulic pressure according to the operating state of the engine, and a refueling passage for supplying hydraulic pressure to the switching device. The oil supply passage includes a first oil supply passage that supplies a hydraulic pressure for switching the switching device from a low speed mode to a high speed mode, and a second oil supply passage that supplies a hydraulic pressure for switching the switching device from a high speed mode to a low speed mode.
A valve operating mechanism for an internal combustion engine, characterized in that the first oil supply passage and the second oil supply passage are selectively connected to a hydraulic pressure supply source depending on the operating state of the engine. (2) A lubricating oil passage for lubricating the sliding contact portion between the cam and the cam follower is connected to the first oil supply passage or the second oil supply passage through a flow rate adjusting means whose opening and closing are controlled according to the operating state of the engine. The valve operating mechanism for an internal combustion engine according to claim 1, which is connected to a passage. (3) The cam includes a low-speed cam and a high-speed cam, and the lubricating oil passage includes a first lubricating oil passage and a second lubricating oil passage that respectively lubricate sliding contact portions between each of the cams and the corresponding cam followers. and the first lubricating oil passage is connected to the first oil supply passage via a first flow rate adjusting means that is fully closed when the switching device switches from the low speed mode to the high speed mode, Registration of a utility model characterized in that the second lubricating oil passage is connected to the second oil supply passage through a second flow rate adjusting means that is fully closed when the switching device switches from the high speed mode to the low speed mode. A valve mechanism for an internal combustion engine according to claim 2. (4) The cam includes a low-speed cam and a high-speed cam, and the lubricating oil path includes a first lubricating oil path that lubricates the sliding contact portion between each cam and the corresponding cam follower, and the high-speed cam. and a second lubricating oil passage that lubricates a corresponding sliding contact portion with the cam follower, and the first lubricating oil passage restricts the flow rate when switching from the high speed mode to the low speed mode of the switching device. The second lubricating oil passage is connected to the first oil supply passage through a flow rate adjustment means, and the second lubricating oil passage is fully closed when the switching device is switched from the low speed mode to the high speed mode. The valve operating mechanism for an internal combustion engine according to claim 2, which is connected to the second oil supply passage.