JPH0323639U

JPH0323639U -

Info

Publication number: JPH0323639U
Application number: JP8363089U
Authority: JP
Priority date: 1989-07-17
Filing date: 1989-07-17
Publication date: 1991-03-12

Description

[Brief explanation of drawings]

第１図は、本考案装置の全体構成図であり、第
２図は、動弁装置の全体構成図であり、第３図及
び第４図は、それぞれ動弁装置の要部断面図であ
り、第５図は、気化器の模式的な構成図である。
第６図〜第８図は、本考案装置の作動要領を示す
フローチヤートである。第９図は、本考案が適用
されるエンジンのトルク特性線図である、第１０
図は、動弁装置の作動領域線図であり、第１１図
は、従来形式の気化器の特性線図である。１……エンジン本体、２……吸気マニホールド
、３……気化器、４……エアクリーナ、５ａ，５
ｂ……ソレノイド装置、６……動弁装置、７……
オイルポンプ、８……電磁弁、９……切換制御弁
、１０……電子制御回路、１１……ロツカシヤフ
ト、１２〜１４……ロツカアーム、１５……カム
軸受、１６……カム軸、１７ａ，１７ｂ……低速
用カム、１８……高速用カム、１９ａ，１９ｂ…
…吸気弁、２０……シリンダヘツド、２１……リ
フタ、２２……連結切換装置、２３〜２５……ガ
イド孔、２６〜２８……連結ピン、２９……油路
、３０……給油孔、３１……給油路、３２……リ
ターンスプリング、３３，３４……給油管、３５
……噴出孔、３６……潤滑油路、３７……噴出孔
、３８……油路、３９……リターンスプリング、
４０……スプール弁、４１……オイルフイルタ、
４２……流入ポート、４３……流出ポート、４４
……オリフイス孔、４５……ドレンポート、４６
……オイルパン、４７……環状溝、４８……パイ
ロツト油路、４９……油圧スイツチ、５１……吸
気バレル、５２……ベンチユリ部、５３……チヨ
ーク弁、５４……スロツトル弁、５５……フロー
ト室、５６……導入管、５７……フロート、５８
……フロート弁、５９……ベント通路、６０……
メイン燃料ジエツト、６１……メイン燃料通路、
６２……メインノズル、６３……メインエア通路
、６４……メインエアジエツト、６５……スロー
燃料ジエツト、６６……スロー燃料通路、６７…
…アイドルアジヤストスクリユー、６８……アイ
ドルポート、６９……バイパスポート、７０……
スローエアジエツト、７１……スローエア通路、
７２……バイパス燃料通路、７３……バイパス燃
料弁、７４……バイパスエア通路、７５……バイ
パスエア弁。 FIG. 1 is an overall configuration diagram of the device of the present invention, FIG. 2 is an overall configuration diagram of the valve train, and FIGS. 3 and 4 are sectional views of main parts of the valve train, respectively. , FIG. 5 is a schematic diagram of the structure of the vaporizer.
6 to 8 are flowcharts showing the operation procedure of the device of the present invention. FIG. 9 is the 10th torque characteristic diagram of the engine to which the present invention is applied.
The figure is an operating range diagram of the valve train, and FIG. 11 is a characteristic diagram of a conventional type carburetor. 1... Engine body, 2... Intake manifold, 3... Carburetor, 4... Air cleaner, 5a, 5
b... Solenoid device, 6... Valve gear, 7...
Oil pump, 8...Solenoid valve, 9...Switching control valve, 10...Electronic control circuit, 11...Rock shaft, 12-14...Rock arm, 15...Cam bearing, 16...Cam shaft, 17a, 17b ...Low speed cam, 18...High speed cam, 19a, 19b...
...Intake valve, 20...Cylinder head, 21...Lifter, 22...Connection switching device, 23-25...Guide hole, 26-28...Connection pin, 29...Oil passage, 30...Oil supply hole, 31... Oil supply path, 32... Return spring, 33, 34... Oil supply pipe, 35
...Blowout hole, 36...Lubricating oil path, 37...Blowout hole, 38...Oil path, 39...Return spring,
40...Spool valve, 41...Oil filter,
42...Inflow port, 43...Outflow port, 44
... Orifice hole, 45 ... Drain port, 46
. . . Oil pan, 47 . ...Float chamber, 56...Introduction pipe, 57...Float, 58
...Float valve, 59...Vent passage, 60...
Main fuel jet, 61... Main fuel passage,
62...Main nozzle, 63...Main air passage, 64...Main air jet, 65...Slow fuel jet, 66...Slow fuel passage, 67...
...Idol Asian Screw, 68...Idol Port, 69...Bypass Port, 70...
Slow air jet, 71... slow air passage,
72...Bypass fuel passage, 73...Bypass fuel valve, 74...Bypass air passage, 75...Bypass air valve.

Claims

[Scope of Claim for Utility Model Registration] A carburetor equipped with an air-fuel ratio variable means, and at least one of the intake valve and the exhaust valve in a relatively low speed range according to the operating state of the engine including the rotational speed. and a valve operation state switching means for switching between a first state adapted to a relatively high speed range and a second state adapted to a relatively high speed range, wherein the intake air amount in the first state and the first state 2
The switching operation of the valve operating state switching means is performed at a point when the amount of intake air in the state of An engine control device characterized in that when the air-fuel ratio variable means is controlled to be rich, the air-fuel ratio variable means is controlled to be rich.