JPS6224610Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for preventing theft of a two-wheeled vehicle.

Unlike passenger cars, motorcycles cannot have their doors locked, so they can be easily approached near the ignition switch, and they can be started without an ignition key by simply connecting the power line directly to the ignition circuit. Therefore, compared to passenger cars, thefts are much more common.

By the way, statistically speaking, connecting the power line directly to the ignition circuit is the most common cause of theft. Normally, the direct connection method described above is to cut the ignition switch wire harness and connect the power line directly to the ignition coil, or pull out the ignition switch connector inside the headlamp housing, which is easy to remove, and connect the wire harness to the ignition switch. This was done by short-circuiting the connector terminals using lead wires.

This idea was created by focusing on the points mentioned above, and its purpose is that it can be installed with only slight modifications to the configuration of a conventional ignition switch, and that the circuit configuration is simple and can be manufactured at low cost. ,
Furthermore, it is an object of the present invention to provide a theft prevention device for a two-wheeled vehicle that consumes no current when the ignition switch is turned off.

Next, an embodiment of this invention will be described with reference to FIGS. 1 and 2. In Figures 1 and 2, the same parts are denoted by the same reference numerals.

1 is a battery mounted on a motorcycle, 2 is an ignition switch with two circuits and two contacts, 3 is a connector that connects the ignition switch 2 and a circuit to be described later, and 4 is an ignition coil including contact points. Its primary side 4a is connected to a normally open contact of the ignition switch 2 via the connector 3. The above are the parts common to Figures 1 and 2.

In Figure 1, 5 is a relay, and its contact 5
a is connected to the primary side 4a of the ignition coil 4. Further, the coil 5b is connected to a normally open contact of the ignition switch 2 via the connector 3 mentioned above.

In FIG. 2, 6 is a transistor 6a, a resistor 6
b, 6c, and the emitter is connected to the primary side 4a of the ignition coil 4.
, the base is connected to the ground via the resistor 6b and the resistor 6
c. Connected to the normally open contact of the ignition switch 2 via the connector 3.

7 is an alarm, and in the case of Figure 1, relay 5 is used.
In FIG. 2, the collector of the transistor 6a of the switching circuit 6 is connected to the contact 5a of the switching circuit 6.

Next, to explain the operation based on the above circuit,
In Figure 1, when ignition switch 2 is closed using the key, battery 1 → connector 3
→ Ignition switch 2 → Connector 3 → Current flows to the primary side of ignition coil 4, and the engine starts. Also, battery 1 → connector 3
→ Ignition switch 2 → Connector 3 → Since current flows to coil 5b of relay 5, contact 5
a is opened and the alarm 7 is not energized.

If the thief attempts to start the ignition coil 4 without the key and connects the primary side 4a of the ignition coil 4 directly to the power supply line, then the battery 1 → contact 5a
(Closed because coil 5b is not energized)
→The alarm device 7 is energized and an alarm is issued.

Next, as shown in Figure 2, turn on the ignition switch 2.
When closed using the key, battery 1 → connector 3 → ignition switch 2 → connector 3
→A current flows to the primary side of the ignition coil 4 and the engine starts. Also, battery 1 → connector 3 → ignition switch 2 → connector 3
→Since a positive potential is applied to the base of the transistor 6a via the resistor 6c, the base current does not flow and the off state is maintained. Therefore, the alarm device 7 is not energized.

If the thief tries to start the ignition coil 4 without the key and connects the primary side 4a of the ignition coil 4 to the power supply line, then the battery 1 → transistor 6
A current flows to the emitter of transistor 6a, and since the base is grounded, the base current flows and transistor 6a is turned on. Therefore, the alarm device 7 is energized and issues an alarm.

In the above embodiment, the coil 5 of the relay 5
b or transistor 6a of switching circuit 6
Ignition switch 2 connected to the base of
If the normally open contact is closed a little earlier than the other normally open contacts, the alarm 7 will not sound even when the engine is started using the key.

As mentioned above, this idea is based on the circuit configuration because when the primary side of the ignition coil is directly connected to the power supply line, the relay or switching circuit is energized, switching is performed, and the alarm is energized to issue an alarm. It is simple and can be installed by just changing the configuration of the ignition switch, and it consumes no current when the vehicle is not in use, so there is no risk of battery draining. It is something that you have.

[Brief explanation of the drawing]

1 and 2 are circuit diagrams showing an embodiment of the anti-theft device for two-wheeled vehicles according to this invention. 1... Battery, 2... Ignition switch, 4... Ignition coil, 5... Relay, 6... Switching circuit, 7... Alarm.

Claims (1)

[Scope of utility model registration request] Connect an alarm in parallel to the primary power supply terminal of the ignition coil via the normally closed contact of the relay or the emitter/collector of the transistor, and connect the non-grounded side of the coil of the relay or the base of the transistor to the ignition switch. It is connected to the normally open contact for the alarm circuit, which is circuit-wise independent of the normally open contact for the ignition circuit provided inside, and is linked to the normally open contact for the alarm circuit, so that both contact circuits are connected to the power supply at the same time when the ignition switch is turned on. An anti-theft device for a two-wheeled vehicle, characterized in that it is configured as follows.