DE1751612A1 - Distributor for motor vehicle engines - Google Patents

Description

VOLKSWAGENWERK Aktiengesellschaft '

Wolfsburg , June 25th, 1968

Our reference: K

1700-Sch / Pt ~

Besohrei b-u η g

Ignition distributors for motor vehicle engines

The invention relates to an ignition distributor for motor vehicle engines with a switch operated by the throttle valve linkage, through which a centrifugal adjuster is activated when the throttle valve is closed influenced and switched on in each open position of the throttle valve a different interrupter system influenced by a vacuum adjuster is according to patent application P 15 76 698.9 (V 33 715 Ia / 46c3). The basic ignition timing the centrifugal adjuster is selected relatively late compared to that of the vacuum adjuster in order to For the purpose of exhaust gas cleaning, good combustion when idling and overrun, but good driving behavior when accelerating and driving in the same direction reach.

If you were to operate the switch directly through the throttle valve lever, so would have to if the position of the throttle valve or the throttle valve lever is regulated by the idle speed limiting screw the distance of the throttle valve lever to the switch must be reset each time, so that either the Switch itself slidable or a slidable stop on the throttle valve lever would have to be provided.

The invention is based on the object of the actuating linkage so to train that only a single adjustment is necessary. It must be ensured that the switch is activated when accelerating from the idle position has already switched to a vacuum valve in each case, before the throttle starts to open. Since with a cold start, which today almost generally includes closing a special, mostly automatically operated starter flap and simultaneous slight opening of the

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Throttle valve takes place, an advance ignition is advantageous, includes the task also the further requirement that the linkage, when the starter flap closes, every time an immediate switch causes on the vacuum adjuster (advance ignition).

According to the invention the object is achieved in that to switch of the switch and for actuating the throttle valve lever an intermediate lever is provided with a free travel between the switch and the throttle valve lever, on which the throttle linkage on the one hand and ax throttle valve return spring act on the other, wherein the intermediate lever has an arm for switching the switch and a second arm for operating the throttle lever. The idle adjustment screw located in the throttle valve cover is equipped with a concentric stop plate for the second arm of the Provided intermediate lever.

Furthermore, with the arrangement of a per se known automatic Starter flap with stepped disc, the intermediate lever is provided with a third arm that engages behind the throttle valve hub.

In further training, the switch is firmly attached to the carburetor and the intermediate lever is arranged pivotably on the shaft of the throttle valve. Connects the intermediate lever and the throttle valve lever a weaker than the return spring trained Ausgleiohsfeder.

The invention is illustrated using an example in the drawing.

It shows

Fig. 1 shows a carburetor with the device according to the invention in the position for idling and thrust when the engine is warm,

Fig. 2 shows the carburetor in the position of tier parts Cold start,

Flg. 3 the carburetor in the full throttle position.

14ΑΜΙΌ8! ⁷ ·

On the carburetor I with the throttle valve 2 and the throttle valve lever 3, the usual 4 (for example in the magazine "Gute Fahrt" I965, Issue 1, pp. 24-27; Issue 4, ö. 64-67 and Issue 5, S. 18 and 19 described) automatic starter flap and 2 denotes the stepped disc of the starter flap 4. On the stepped pulley 5, one of the notches, which depends on the temperature of the engine, rests against the idle adjustment tube 6 at the end of the throttle valve lever 3, for example (Fig. 2) against the top notch when the engine is cold (cold start with the starter valve 4 closed) or (Fig. 1) with a warm machine at the bottom notch of the stepped pulley (warm idle and thrust, starter flap 4 fully open).

An ignition distributor 7, which is the subject of the main application P 15 76 698.9 (V 33 715 Ia / 46c3), has two superimposed, mutually independent interrupter systems, namely (Lm not shown individually) above the one influenced by a centrifugal force adjuster, in its basic setting to late ignition The breaker cable 8 leads to the breaker of which the breaker cable 8 leads, and the lower one, which is influenced by a vacuum adjuster and is set to pre-ignition, with the breaker cable 9 « Primary current when the throttle valve 2 is closed to the interrupter cable 8 of the centrifugal adjuster system, when the throttle valve is open. ¹ ^ throttle valve 2, however, leads to the interrupter cable 9 of the Unterui-ücKveEstellersystem.

On the shaft of the throttle valve 2 and the throttle valve lever 3 an intermediate lever 13 ″ of one arm 14 is pivotably seated for actuation of the switch 12, a second arm 15 for actuating the for this purpose with a concentric stop plate 16 on the Leerlaufeinstellsciu- <a.uDe 6 provided throttle valve lever 3 as well as a third arm I7 gripping behind the throttle valve lever 5 in the shape of a hook having. Between the arm 15 and the AnscuXagplatte 16 or accordingly

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BATH ORIGINAL

between arm 14 and the La-uckknopf of the switch 12 is always a Match s .... S _x (an idle travel) available «whose size depends on which of the stages detent disk, the idle adjusting screw 6 is in the throttle lever. 3 There is also between the hook of the arm 17 and the throttle valve lever 3 a notch, which is also dependent on the position of the idle adjusting screw 6 in the throttle valve lever 3, the distance a ... ^ a _x , which is in the Cold start position, when the idle speed screw 6 is on one of the upper notches, is mistakenly indented, so that the intermediate lever 12 is taken along and the arm 14 is lifted from the switch 12 Direction the throttle linkage 19. To avoid rattling noises caused by the idle travel a, a compensating leather 20 which connects the throttle valve lever 3 and the intermediate lever 13 and is weaker than the return spring is provided.

When the engine is warm or the starter flap 4 (Pig I) is open, the idle setting screw 6 is on one of the lower notches of the stepped disk 5, which pulls the return spring 18 because the hook-shaped arm 17 of the intermediate lever 13 does not rest on the throttle valve lever 2 (distance a), the Arm Ik on the double lever 15 against the switch 12, whereby the interruption device operated by the centrifugal adjuster is switched on via cable 8 on the ignition distributor 7 (manual setting "late")

With a cold start (Pig · 2) the idle adjustment screw 6 steats while enlarging the idle travel to β _χ on the upper notch of the stepped disk 5, the throttle valve lever 3 has taken the intermediate lever xj with its hook-shaped arm 17 (4 * υ) »ο far that the Switch 12 over cable 9 has switched to the breaker system set to advance ignition.

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Is also switched via cable 9 to " ^{advance ignition 11"} in all open positions of the throttle valve 2 (acceleration and aieiohfahrt) up to the full throttle position (Pig. 3), but the arm 15 then rests on the stop plate 16 and has actuated the throttle valve lever 3, while against it the distance between the hook-shaped arm 17 and the throttle valve lever 3 has now increased _{to S x}

The inventive use of the intermediate lever 13 and The variable idle travel s is a setting for regulating the idling speed and the switching point of the switch 12 only in one place, namely on the idle screw required and at the same time ensured «that when accelerating from the idle position - to avoid a possibly jerky Jump in engine speed - always switch to the vacuum adjuster first and only then the throttle valve is opened.

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Claims (6)

Expectations 1. Ignition distributor for motor vehicle engines with a switch operated by the throttle valve linkage "by which, when the throttle valve is closed, an interrupter system influenced by a centrifugal adjuster and a different interruption system influenced by a vacuum adjuster is switched on according to patent application V 33 715 Ja / 46c3, in each open position of the throttle valve _{that an intermediate lever (13) is provided with a free travel (8 .... S x} ) between the switch (12) and the throttle valve lever (3) to switch the switch (12) and to operate the throttle valve lever (3) « on the one hand the throttle linkage (19) and on the other hand the throttle valve return spring (l8) engages. 2. Ignition distributor according to claim 1 «characterized in that the Intermediate lever (13) an arm (14) for switching over the switch (12) and a second arm (15) for operating the throttle valve lever (3). 3. Ignition distributor according to Claims 1 and 2, characterized in that the idle speed adjustment screw (6) located in the throttle valve lever (3) provided with a concentric stop plate (16) for the arm (15) of the intermediate lever (I3). 4. ignition distributor according to claim 1 to 3, characterized in that in the arrangement of a known automatic starter flap (4) with a stepped disc (5) the intermediate lever (13) with a third, The arm (17) engaging behind the throttle valve lever (3) is provided by which, when the throttle valve lever (3) is in position, it moves to the upper Latching (cold start) of the stepped pulley (5), the intermediate lever (13) is carried along and thereby the switch (12) on the to to advance ignition The set breaker system leading breaker cable (9) is switched. 109818/0576 5. Ignition distributor according to claim 1 fcfe 4, characterized in that that the switch (12) is attached to the carburetor (1). 6. Ignition distributor according to Claim 1 to 5, characterized in that the intermediate lever (13) is pivotable on the shaft of the throttle valve (2) is arranged. 7 * Ignition distributor according to Claims 1 to 6, characterized by a compensating spring (20) connecting the intermediate lever (13) and the throttle valve lever 0) which is weaker than the return spring (18). 109818/0576 Lee rs e it