JPH0243471U

JPH0243471U -

Info

Publication number: JPH0243471U
Application number: JP12119188U
Authority: JP
Priority date: 1988-09-17
Filing date: 1988-09-17
Publication date: 1990-03-26

Description

[Brief explanation of drawings]

図面はこの考案の実施例に関し、第１図及び第
２図はクランク軸に対するフライホイールの相対
回転角が異なる状態においてクランク軸の軸方向
からフライホイールを見た図、第３図はクランク
軸とフライホイールとの結合部の縦断面図、第４
図は二サイクルエンジンの全体概略図。第５図は
二サイクルエンジンの点火回路図、第６図は二サ
イクルエンジンの別の点火回路図である。１４……二サイクルエンジン、３４……クラン
ク軸、４８……フライホイール（ロータ）、４９
……ナツト（止着具）、５８……磁極、６２……
一次コイル（一次電流生成コイル）、６８……ト
ランジスタ（しや断手段、スイツチング手段）、
７０……ソースコイル（一次電流生成コイル）、
７６……ピツクアツプコイル（しや断手段）、８
０……サイリスタ（しや断手段）、８２……キー
溝、８４……キー挿通孔、８６……キー。 The drawings relate to an embodiment of this invention, and FIGS. 1 and 2 are views of the flywheel viewed from the axial direction of the crankshaft with different relative rotation angles of the flywheel to the crankshaft, and FIG. 3 is a view of the flywheel viewed from the axial direction of the crankshaft. Longitudinal cross-sectional view of the connection part with the flywheel, No. 4
The figure is an overall schematic diagram of a two-stroke engine. FIG. 5 is an ignition circuit diagram of a two-stroke engine, and FIG. 6 is another ignition circuit diagram of a two-stroke engine. 14...Two-cycle engine, 34...Crankshaft, 48...Flywheel (rotor), 49
... Nut (fastening tool), 58 ... Magnetic pole, 62 ...
Primary coil (primary current generating coil), 68...transistor (shutdown means, switching means),
70... Source coil (primary current generating coil),
76...Pick-up coil (shrinking means), 8
0... Thyristor (shrink cutting means), 82... Key groove, 84... Key insertion hole, 86... Key.

Claims

[Scope of claims for utility model registration] (1) Crankshaft 34 of two-cycle engine 14
a rotor 48 that rotates integrally with the rotor 48 and has a magnetic pole 58 on its periphery; a primary current generating coil 62 that generates a primary current as an induced current in relation to a change in distance between the rotor 48 and the magnetic pole 58 as the rotor 48 rotates; 70
and damping means 68, 76, 80 for cutting off the primary current in relation to the rotational angle of the rotor 48, the rotor 48 is connected to the crankshaft. An ignition timing control device for a two-cycle engine, characterized in that it is fixed to the crankshaft 34 so that the relative rotation angle with respect to the shaft 34 can be adjusted. (2) a key groove 82 formed at the end of the crankshaft 34 into which the key 86 is inserted; and the rotor 48
a key insertion hole 84 into which the key 86 is inserted so as to be able to freely adjust the position of the key 86 with respect to the rotational direction of the rotor 48; and a fastener that removably fastens the rotor 48 to the crankshaft 34. 4
9. The ignition timing control device for a two-stroke engine according to claim 1, characterized in that it comprises: (3) The damping means 68 includes a switching means 68 that opens and closes depending on the value of the primary current and cuts off the primary current when the primary current exceeds a predetermined value. Item 3. Ignition timing control device for a two-cycle engine according to item 1 or 2. (4) The shearing means 80 includes a pickup coil 76 for detecting a predetermined rotation angle of the rotor 48.
2. The ignition timing control device for a two-stroke engine according to claim 1, further comprising: a thyristor 80 which is opened and closed by the pickup coil 76 to control on/off of the primary current.