JP3567915B2 - Motorcycle anti-theft device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motorcycle anti-theft device, and more particularly to a motorcycle anti-theft device that controls driving and stopping of an engine ignition device depending on whether an appropriate key is used.
[0002]
[Prior art]
In motorcycles, anti-theft devices using various mechanical means are generally known, such as a so-called steering lock device in which rotation of a steering is prevented at a fixed position by performing a key operation. At present, in addition to these mechanical means, when an inappropriate key is used, a method of stopping the driving of the engine by electric control has been proposed and implemented.
[0003]
As an anti-theft device using this electric control, for example, there is one shown in FIG. In FIG. 8, a is a cylindrical ignition switch for instructing driving of the engine, and this switch a is provided on an upper bracket of a motorcycle (not shown), and has a specific shape at one end thereof. A key groove into which the key b can be inserted is formed. The key b has a built-in transmitter c for generating a predetermined code signal, and the ignition switch a has a built-in antenna d for receiving a signal from the transmitter c.
[0004]
When the key b is inserted into the ignition switch a, a radio wave from the transmitter c is received by the antenna d, and the control device e drives the engine ignition device f according to the received code signal and the rotation operation state of the key b. , Stop is controlled.
[0005]
That is, as shown in FIG. 9, the controller e has a receiving circuit e1 for receiving a predetermined radio wave with the antenna d, and whether the code signal output from the receiving circuit e1 is a preset code signal. A control circuit e2 that outputs a control signal in accordance with whether the signal is received, an interface circuit e3 that outputs a signal output from the control circuit e2 to the engine ignition device f, and the like are housed. If the set code signal matches a preset code signal, the engine ignition device f is made drivable via the interface circuit e3, and the engine is driven by rotating the key b only to a predetermined drive position. It is possible to do. If the two code signals do not match, the control circuit e2 disables the driving of the engine ignition device f. Therefore, even if the key b is rotated to the driving position, the driving of the engine is stopped. I have.
[0006]
[Problems to be solved by the invention]
In the above-described conventional anti-theft device, in addition to the key b and the ignition switch a conforming in shape, the encryption code output from the transmitter c and the encryption code set in the control device e are different. Since the coincidence is a condition for driving the engine, a superior anti-theft effect can be obtained as compared with a steering lock mechanism or the like relying only on the coincidence of the shape of the key b and the ignition switch a, and the usefulness is high. It has been evaluated, but on the other hand, there is a problem that malfunction, malfunction, breakage, and the like are likely to occur, and a solution to the problem is desired.
[0007]
That is, the anti-theft device is expected to have the effect of suppressing theft by making its surroundings aware of its existence. However, in the above-mentioned conventional anti-theft device, the control device e, which has the appearance of the device, is installed below the upper bracket. Therefore, there is a problem in that it is difficult for other people to recognize the existence, and the effect of suppressing theft is not sufficiently exhibited. For this reason, under the present circumstances, a situation where the steering lock device or the like is left behind after being damaged frequently occurs.
[0008]
The present invention has been made to solve the above problems, and has as its object to provide a motorcycle anti-theft device capable of suppressing the occurrence of theft.
[0009]
[Means for Solving the Problems]
The present invention relates to an ignition switch capable of fitting only a specific key that matches in shape, and a code signal transmission that is fixed to the key and outputs an encryption code signal set in advance to the key as a predetermined radio wave. Means, an antenna for receiving a radio wave output from the code signal transmitting means, a receiving means for extracting an encryption code signal from the radio wave received by the antenna, and the encryption code signal matching a predetermined encryption code. Control means for setting an engine ignition device mounted on the motorcycle to a drivable state or a non-driveable state in accordance with whether or not the motorcycle is stolen. A pair of left and right forks that rotatably support the front wheel at the lower end are inserted above and below the steering shaft inserted through the pipe. That the upper bracket and the lower bracket are inserted, controller having an ignition switch and an annular antenna and at least said receiving means to be fitted only the specific key includes a steering lock mechanism to the lower end, an ignition A motorcycle anti-theft device characterized in that an upper end of the switch is fitted and integrally connected to a housing of the control device and is integrally installed on the upper bracket.
[0010]
As described above, in the motorcycle anti-theft device according to the present invention, since the control device is integrally installed on the upper bracket, it is recognized at a glance that the motorcycle is equipped with the anti-theft device. Since it is possible to recognize the difficulty of theft, an excellent antitheft effect can be exhibited.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1 to 7 are views showing a motorcycle anti-theft device according to a first embodiment of the present invention. FIG. 1 is a side view of the motorcycle applied to the embodiment, and FIG. FIG. 3 is a perspective view showing the configuration around the upper bracket, FIG. 3 is an explanatory view showing the mounting state of the antenna and the circuit configuration of the control device in the embodiment, FIG. 4 is a plan view showing the embodiment, and FIG. 2 is a longitudinal sectional side view taken along line AA of FIG.
[0012]
The motorcycle shown in FIG. 1 is provided with a swing arm SA that rotatably supports a rear wheel H2 and a cradle-type frame FL that supports an engine E and the like. A head pipe FL1 through which the shaft is inserted is fixed. An upper bracket 1A and a lower bracket 1B are vertically opposed to each other at upper and lower ends of a steering shaft inserted through the head pipe FL1, and a pair of left and right forks are inserted into both brackets 1A and 1B. FO1 and FO2 are inserted and fixed, and a front wheel H1 is rotatably supported at the lower end thereof.
As shown in FIG. 2, left and right split steering wheels ST1 and ST2 are fixed to the upper bracket 1A, and an anti-theft device 10 according to the first embodiment is provided in the center of the front part. .
[0013]
As shown in FIGS. 3 to 5, the antitheft device 10 according to the first embodiment includes an ignition switch 2, a steering lock mechanism 3, a control device 4, and a key 6 in appearance. The anti-theft device 10 is provided with an ignition switch 2 that allows only the specific key to be fitted, a ring-shaped antenna 5, and a control device 4 including at least the transmission / reception circuit 41, which is integrally mounted on the upper bracket 1 </ b> A. It was done.
That is, the ignition switch 2 shown in FIGS. 3 to 5 has a cylindrical outer shape, and a steering lock mechanism 3 is integrally fixed to a lower end thereof, and a control device 4 is integrally fixed to an upper end thereof. The control unit 4 has its outer is formed by a rectangular shape in a plan view of the housing 4 a as shown in FIG. 4, the projecting step portion formed at the bottom thereof is formed on the front center of the upper bracket 1A fitted in the recess 1 A1, and is fixed by screws 1a.
[0014]
An annular antenna 5 is housed in the upper end of the ignition switch 2, and a lead wire 51 connected by the antenna 5 is connected to a joint 24 between the side wall of the ignition switch 2 and the control device 4. The lead wire 51 is introduced into the control device 4 through a communication hole (not shown) formed in the control device 4 and connected to a transmission / reception circuit 41 provided in the control device 4 as shown in FIG. Have been. In the control device 4, in addition to the transmission / reception circuit 41, a control circuit 42 for performing predetermined operations such as calculation, determination and control, and a control signal from the control circuit 42 for inputting the control signal to the engine ignition device 8 . It has an interface circuit 43 and the like.
[0015]
On the other hand, the key 6 is provided with a transponder 7 as a transmitter for outputting an encryption code signal corresponding to the outer shape of the key 6.
The transponder 7 receives a specific code signal, and superimposes a preset encryption code signal on a predetermined carrier wave and outputs it as a radio wave.
The steering lock mechanism 3 inserts a key 6 conforming in shape to the ignition switch 2 and rotates the key so that the engaging projection 3a moves forward and backward, and protrudes from the outer peripheral surface of the head pipe FL1. The engaging protrusion 3a is adapted to be disengaged from the engaged cylindrical portion FL2. In FIG. 4, reference numeral 43a denotes a lead wire connecting the interface circuit 43 and the engine ignition device 8 so as to be led out along a guide portion 4a1 provided at the front end of the housing 4a. Has become.
[0016]
In the motorcycle having the anti-theft device having the above-described configuration, in order for the motorcycle to run, the key 6 and the keyway 2a of the ignition switch 2 are set in the key transmitter in addition to the shape match. It is necessary to match the encryption code with the encryption code set in the control device.
That is, when the key 6 having a shape corresponding to this is inserted into the key groove of the ignition switch 2 and the key 6 is rotated to the release position of the steering lock mechanism 3, the engagement projection 3a of the steering lock mechanism 3 Then, the steering wheel is in a steerable state. In this state, the power is turned on, and the control circuit 42 causes the transmission / reception circuit 41 to output a predetermined radio signal via the antenna 5.
[0017]
This output radio signal is received by the transponder 7 of the key 6 located in the vicinity of the antenna 5, and if the received signal matches the signal set in the transponder 7 in advance, the transponder 7 responds to the received signal. A code signal representing a predetermined code number is superimposed on a predetermined carrier and output. The output signal from the transponder 7 is received by the antenna 5 and input to the transmission / reception circuit 41. The transmission / reception circuit 41 extracts a code signal from the input reception signal, and inputs the code signal to the control circuit 42.
[0018]
The control circuit 42 determines whether or not the input code signal matches the preset encryption code signal. If not, the control circuit 42 sends a stop signal to the engine ignition device 8 via the interface circuit 43. Send out. As a result, the engine E is in a driving disabled state, and the engine E is not driven even if a predetermined engine driving operation is performed. If the code signal input to the transmission / reception circuit 41 via the antenna 5 matches the encryption code signal set in the control circuit 42 in advance, the control circuit 42 transmits the signal to the engine ignition device 8 via the interface circuit 43. is drivable signal delivered engine E becomes drivable state, the engine E by a predetermined driving operation is driven.
[0019]
For Thus, in this first embodiment, when the encryption code signal set by each transponder 7 and the control device 4 is a mismatch, it is not possible to drive the engine E, the key 6 Even if the outer shape of the motorcycle is illegally copied, it is impossible to steal the motorcycle because the engine E does not operate.
Further, since the antenna 5 and the control unit 4 is provided integrally with the lead wire 51 for connecting the two can be prevented noise pickup for greatly reducing, moreover, lead 51 is the external space , The occurrence of disconnection and the like is greatly reduced, and the safety is greatly improved.
[0020]
Further, the control device 4 according to the first embodiment is fixed to the upper bracket 1, and its housing 4a is exposed to the outside, and a display that clarifies its presence is displayed on the upper surface (here, “electronic lock”). System)), it is possible for anyone to understand at a glance that the anti-theft device is installed, and it is possible to recognize the difficulty of theft. Obtainable.
[0021]
Next, a second embodiment of the present invention will be described with reference to FIGS. In the drawings, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the second embodiment, a through hole 1A2 is formed in the bottom surface of the concave portion 1A1 of the upper bracket 1A, from which a lead wire 43a connecting the control device 4 and the engine ignition device 8 is led out. A plate 4b made of a rigid body is fixed to an upper surface of a housing 4a forming an outer shell of the device 4 with screws 1b, and a display indicating the presence of the anti-theft device 10 is provided on the upper surface of the plate 4b (here, “Electronic lock system”). According to this, it is possible to obtain the same effect as in the first embodiment, since the can avoid exposure to the outside also lead 43 a connected to the engine ignition device 8, the disconnection of the lead wire 43a Can also be prevented. Further, the protection of the control device 4 and the improvement of the strength of the entire device can be achieved by the plate body 4b.
[0022]
In each of the above embodiments, the transponder 7 is provided on the key 6 and the transmission / reception circuit 41 is provided on the control device 4, and the encryption code signal is output only when the output from the transmission / reception circuit 41 is a predetermined radio signal. Therefore, whether the key 6 and the ignition switch 2 match in shape, whether the radio wave from the transmission / reception circuit 41 matches the transponder 7 , and the code signal from the transponder 7 And a code signal set in the control device 4 to determine whether or not they match, and the engine E can be driven only when the determination in all the steps is appropriate. Although it is possible to obtain very good anti-theft effect, as shown by the aforementioned prior art, provided with a transmit-only device to a key 6, received by the control unit dedicated Also the present invention for those providing the vessel is applicable, it is not limited to the above embodiment.
[0023]
【The invention's effect】
As described above, in the motorcycle anti-theft device according to the present invention, the appearance of the anti-theft device can be recognized at a glance by the housing exposed on the upper surface of the upper bracket. The effect of suppressing theft is obtained in addition to the effect of prevention.
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle applied to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a configuration around an upper bracket shown in FIG.
FIG. 3 is an explanatory diagram showing an attached state of an antenna, a circuit configuration of a control device, and the like in the embodiment.
FIG. 4 is a plan view showing the embodiment.
5 is a vertical sectional side view taken along line AA of FIG.
FIG. 6 is a plan view according to a second embodiment of the present invention.
FIG. 7 is a vertical sectional side view taken along the line BB in the embodiment.
FIG. 8 is an explanatory side view showing a conventional motorcycle anti-theft device.
FIG. 9 is an explanatory diagram showing a circuit configuration and the like of a control device in the above device.
[Explanation of symbols]
1 A upper bracket
1B Lower bracket 2 Ignition switch
3 Steering lock mechanism 4 Control device
4a Control device housing 5 Antenna 6 Key 7 Transponder (code signal transmitting means)
8 Engine ignition device 10 Anti-theft device 41 Transmission / reception circuit (receiving means)
42 control circuit (control means)
E Motorcycle engine
FL motorcycle frame
FL1 Head pipe
FO1, FO2 fork
H1 front wheel

Claims (1)

An ignition switch that allows only a specific key that matches in shape to be fitted,
Code signal transmitting means fixed to the key and outputting an encryption code signal set in advance to the key as a predetermined radio wave,
An antenna for receiving a radio wave output from the code signal transmitting means,
Receiving means for extracting an encryption code signal from radio waves received by the antenna,
Control means for setting an engine ignition device mounted on the motorcycle to a drivable state or a non-driveable state in accordance with whether or not the encryption code signal matches a predetermined encryption code. A prevention device,
Above and below the steering shaft inserted into the head pipe of the motorcycle frame, an upper bracket and a lower bracket that insert and support a pair of left and right forks that support the front wheel rotatably at the lower end are inserted.
A control device including an ignition switch, a ring-shaped antenna, and at least the receiving means, which includes a steering lock mechanism at a lower end thereof so that only the specific key can be fitted , fits an upper end portion of the ignition switch into a casing of the control device. A motorcycle anti-theft device, wherein the anti-theft device is integrally connected to the upper bracket.

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