JPH0721783Y2 - Anti-theft device for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an anti-theft device for a motorcycle including a motorbike, for example.

[Prior Art] For example, in the case of a bicycle with a prime mover, which is usually called a motorcycle, having a displacement of about 50cc or 125cc, a kick starter is generally widely used in the past to simplify the structure. Further, the cover of the vehicle body is also lightened, so that it is easily damaged. In order to prevent theft, in many cases the handle is locked when the engine key is removed. However, even this handle lock is often easily broken if the handle is twisted with force. The conventional ignition system of a prime mover has a structure in which an output terminal of a generator connected to the prime mover is directly connected to an ignition coil. The capacitor for inducing a high voltage in cooperation with the ignition coil is configured so that both ends thereof are short-circuited when the engine key is in the off position. As a result, the charging of the capacitor is blocked, the engine is stopped, and the engine cannot be started.

[Problems to be solved by the invention] Since the conventional motorcycle has such a simple structure, if the handlebar lock is removed, the cover is broken, and the connector is removed from the engine key cylinder, the short circuit of both poles of the capacitor is released. Therefore, the engine can be easily started by stepping on the kick pedal.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above drawbacks of the prior art and to provide an antitheft device for a motorcycle in which the engine cannot be easily started by an illegal method.

[Means for Solving the Problems] The anti-theft device for a motorcycle according to the present invention includes a key cylinder having an engine key removably inserted therein and having at least two key operation positions of an on position and an off position, and a key cylinder detachable from the key cylinder. Connector means operatively engaged and having at least first to fourth connection terminals,
The second terminal is connected to both ends of the capacitor of the ignition system circuit of the engine, the third terminal is connected to the power circuit, the fourth terminal is connected to the ignition coil of the engine, and the key cylinder is always closed. And a normally-closed contact that opens in response to at least two key operation positions of the engine key, and a connection line that connects between the third and fourth terminals when the key cylinder is engaged with the connector means. The normally closed contact connects the first and second terminals in a state of being engaged with the connector means, inserts the engine key into the key cylinder, and rotates the engine key to the ON position. Open between terminals.

According to the present invention, it also has such an anti-theft device,
Provided is a motorcycle including a power supply circuit including a generator whose output terminal is connected to a third terminal.

[Operation] The anti-theft device for a motorcycle according to the present invention is configured such that the output of the power supply circuit is connected to the ignition system circuit of the prime mover via the engine key circuit. Therefore, for example, even if the connector is separated from the engine key circuit to start the engine, high voltage is not supplied from the ignition circuit to the spark plug of the engine, and therefore the engine cannot be started.

In the present specification, the term "motorcycle" is not limited to a normal motorcycle defined by the Road Traffic Act and the like,
It should be broadly interpreted to include any two-wheeled vehicle that runs on a prime mover, such as a motor vehicle.

[Embodiment] An embodiment of the anti-theft device for a motorcycle according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to the drawings, there is shown a block diagram of an embodiment in which the present invention is applied to an electric system of a motorbike. This motorcycle has a generator 10 connected to a prime mover (not shown), and has a rectifying diode 14 at a power output terminal 12 thereof.
Through the positive electrode 18 of the battery 16. The positive electrode of the battery 16 is housed in one terminal 28 of a connector 28 described later. The power supply circuit of this device is configured by these.

This device is equipped with a key cylinder 24 into which the engine key 20 can be inserted.
And a connector 26 as shown is detachably loaded therein. The key cylinder 24 has at least two operating positions as its switching positions when the engine key 20 is inserted. One of them is an off position that defines a state in which the engine is not driven, and the other is an on position that drives or is capable of driving the engine.

In a normal state, the key cylinder 24 mechanically engages with the connector 26, and unless the key cylinder 24 is forcibly removed, the key cylinder 24 and the key cylinder 24 are not separated from each other. The connector 26 is a 6-pin connector having 6-system connecting circuits as shown in the figure.
One is the above-mentioned terminal 28. The terminal 28 of the connector 26 is connected to the terminal 30 of the key cylinder 24 when engaged with the key cylinder 24.
A contact 32 is connected to 30 as shown. Contact 32
Is a normally open contact, and when the key 20 is inserted into the key ring 24 and turned on, in response to this, the terminal 30 is connected to the terminal 34.
Connect to. The terminal 34 is connected to the terminal 36 of the connector when engaged with the key cylinder 24. The connector terminal 36 is
It is connected to another electric device 40 such as a blinker or a headlamp via the operation switch 38.

The ignition system output terminal 42 of the generator 10 is connected to another terminal 44 of the connector 26. The connector terminal 44 is connected to its terminal 46 when engaged with the key cylinder 24, and the terminal 46 is permanently connected to the contact 50 by a connecting wire 48 as shown. The terminal 50 is connected to the terminal 52 of the connector when engaged with the key cylinder 24. Connector terminal
52 is connected to a common connection point 60 between the low-voltage side primary winding 56 and the high-voltage side secondary winding 58 of the ignition coil 54. The other terminal 62 of the high voltage secondary winding 58 is connected to a spark plug 64 of an engine (not shown). It goes without saying that, in the embodiment in which the engine has a plurality of cylinders, the distributor is interposed in the middle of the connecting line 62.

The other terminal 66 of the low voltage side primary winding 58 of the ignition coil 54 is connected to a common connection point of the capacitor 68 and the interrupter contact 70. As is well known, the interrupter 70 is a contact that makes an interrupt in synchronization with the rotation of the engine, by which the spark plug 64 is connected.
The ignition system is configured. Primary winding of ignition coil 54
Terminal 66 of 56 is also connected to terminal 72 of connector 26. The terminal 72 is connected to the terminal 74 when the key cylinder 24 is engaged, and the contact 74 is connected to the terminal 74 as illustrated. The contact 76 is a normally closed contact, and when the key 20 is inserted into the key cylinder 24 and turned on, the terminal 74
Disconnect from terminal 76. The terminal 78 is connected to the terminal 72 of the connector when engaged with the key cylinder 24. The connector terminal 72 is grounded as shown. By this grounding, the circuit of the ignition system turns the engine key into the key cylinder 24.
Both ends of the capacitor 68 are short-circuited when removed from the
Therefore, even if the kick pedal (not shown) is used, the engine will not start.

Under normal equipment conditions, the key cylinder 24 is engaged with the connector 26. Therefore, the engine key 20 is a key cylinder
When it is inserted into 24 and turned to the ON position, one contact 32 of the key cylinder 24 closes and the other contact 76 opens. This allows other electrical devices 40 to connect from battery 16 to switch 38.
Power can be supplied via the. Also, when the kick pedal is depressed, the interrupter contact 70 opens and closes, which causes the battery
High pressure is supplied from 16 to the ignition plug 64 via the ignition coil 54, and the engine is started.

By the way, when the connector 26 is separated from the key cylinder 24, all the six connection circuits of the connector 26 are separated from each other. Of particular note is that the connector terminal 44, to which the ignition system output terminal 42 of the generator 10 is connected, is released from the connection state with the mating connector terminal 52 by separating the connector 26. When the key cylinder 24 is engaged with the connector 26, the connector terminal 26 is
It is connected to the contact 52 by a permanent connection 48 on the key cylinder 24. Connector terminal by separating connector 26
Since 44 is disconnected from the mating connector terminal 52, the ignition output terminal 42 of the generator 10 is wound by the winding of the ignition coil 54.
Separated from 56 and 58. Therefore, even if the crank pedal of the engine is rotated by stepping on the kick pedal, high pressure is not supplied to the ignition plug 64.

In the conventional ignition system circuit, the ignition output terminal 42 of the generator 10 is directly connected to the terminal 60 of the ignition coil 54, as shown by the dotted line 82. In other words, unlike the embodiment of the present invention, the connector 28 and the cylinder 24 are not used. When the key is inserted into the key cylinder 20 and turned to the ON position, the contact 76 is opened, and when the kick pedal is depressed to rotate the crankshaft of the engine, high voltage is supplied from the output 42 of the generator 10 to the spark plug 64. And the spark plug 64 is discharged. This worked well even with the connector 26 separated from the key cylinder 24. That is, the short circuit due to the contact point 76 of the capacitor 68 is released only by disconnecting the connector 26, and the ignition coil 54
The circuit of the ignition system including is normally formed. Then, I could start the engine normally by stepping on the kick pedal.

However, according to the present invention, the output terminal 42 of the generator 10 is not directly connected to the terminal 60 of the ignition coil 54 and the key cylinder
24, even if the connector 26 is separated from the key cylinder 24 to start the engine, the ignition coil 54 is not supplied with high voltage and therefore the engine cannot be started.

According to the present invention, the output terminal of the generator is directly
It is configured not to be connected to the ignition system circuit of the prime mover but through the engine key circuit. Therefore, even if the connector is separated from the engine key circuit to start the engine, high voltage is not supplied from the ignition circuit to the spark plug, and the engine cannot be started.

The present invention is particularly effectively applied to a kick starter type motorbike and a motorcycle. In such a motorcycle, in the conventional system, the ignition system circuit is normally formed only by separating the connector from the key cylinder and opening the short circuit of the ignition system circuit including the ignition coil. Therefore, if the present invention is applied to such a vehicle, it can be prevented from being stolen. The present invention is effectively applied not only to such vehicles but also to vehicles having other prime movers such as ships and aircraft.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to an electric system of a motorbike. Explanation of symbols of main parts 10 …… Generator 16 …… Battery 24 …… Key cylinder 26 …… Connector 44, 52 …… Connector terminal 48 …… Connection wire 54 …… Ignition coil 76 …… Contact

Claims (2)

[Scope of utility model registration request] 1. A key cylinder into which an engine key is removably inserted and which has at least two key operation positions of an on position and an off position, and a key cylinder which is removably engaged with the key cylinder and which has at least a first position.
To connector means having a fourth connection terminal, the first and second terminals are connected to both ends of the capacitor of the ignition system circuit of the engine, the third terminal is connected to the power supply circuit, and the fourth A terminal is connected to an ignition coil of the engine, the key cylinder is in a normally closed state, and a normally closed contact which opens in response to at least two key operation positions of the engine key, and the key cylinder serves as the connector means. A connection wire connecting between the third and fourth terminals when engaged, the normally closed contact connecting between the first and second terminals when engaged with the connector means. Then, when the engine key is inserted into the key cylinder and rotated to the ON position, the space between the first and second terminals is opened, and the antitheft device for a motorcycle. 2. A motorcycle having the anti-theft device according to claim 1, wherein the power supply circuit includes a generator having an output terminal connected to a third terminal.