JPS6342045Y2 - - Google Patents

Description

[Detailed description of the invention] This invention consists of a generator coil of an alternator driven by the engine, an excitation coil of the horn, and a current-carrying path connecting these two coils, and the horn is activated by the output of the generator coil. This invention relates to a horn circuit for a vehicle such as a motorcycle, which makes a sound.

In recent years, in motorcycles and the like, there has been a trend toward multipolar alternating current generators due to an increase in various electrical loads.
When an AC generator becomes multi-polar, the frequency of its AC output current naturally increases, so as in the past,
In the case where the horn is blown by exciting the excitation coil with the full wave of the AC output, the natural frequency of the normally used diaphragm does not match the frequency of the above current, and the horn cannot be blown, especially in the high rotation range of the engine. It may become.

The purpose of the present invention is to provide a simple and effective horn circuit that eliminates such inconveniences, and its features include half-wave rectification of the alternating current output of the generating coil and feeding it to the excitation coil. A means is provided in the current-carrying path.

Hereinafter, an embodiment in which the present invention is applied to a motorcycle will be described with reference to the drawings.

First, starting with the first embodiment shown in FIG.
G is a multi-pole magnet alternator that is driven by the engine and serves as a power source for all the electrical loads of the vehicle, and H is a horn, including the generating coil 1 of the generator G and the excitation coil 2 of the horn H. An ignition switch 4, a horn switch 5, and a diode 6 of the engine are inserted in series with each other in a current-carrying path 3 connecting the two. Although the forward direction of the diode 6 may be directed in either direction, in the illustrated example, the forward direction is the direction from the power generation coil 1 to the excitation coil 2.

When the horn switch 5 is closed while the generator G is being driven by the engine (the ignition switch 4 is already closed), an AC output is output from the generator coil 1 to the current carrying path 3. However, this is half-wave rectified by the diode 6, and in the illustrated example, only a positive wave current is passed through the excitation coil 2 of the horn H to intermittently excite it. Therefore, the number of times the excitation coil 2 is excited is 2 compared to the conventional case where the excitation coil 2 is excited by the full wave of the AC output of the generator coil 1.
Even if the frequency of the output current of the generating coil 1 increases considerably, the diaphragm of the horn H resonates well and can generate an alarm sound.

An example of the specific structure of the horn H will be explained with reference to FIGS. 2 and 3. The housing 7 accommodates an iron core 9 attached to a support plate 8 and the excitation coil 2, and the diode 6 is attached to the support plate 8 at this time. This support plate 8 is fixed to the housing 7 together with a diaphragm 10 disposed facing the iron core 9 and a cover 11 covering the outer surface of the diaphragm 10 . By doing so, there is an advantage that not only the structure becomes simple since a special support plate for mounting the diode 6 is not required, but also the diode 6 can be protected by the housing 7.

Next, a second embodiment of the present invention will be explained with reference to FIG. 4, in which the diode 6 of the previous embodiment is replaced with
Short-circuit path 12 in which a diode 16 is inserted in the current-carrying path 3
In this case as well, the forward direction of the diode 16 may be directed in any direction. The rest of the structure is the same as that of the previous embodiment, and the same reference numerals are given to the parts in FIG. 4 that correspond to those of the previous embodiment.

Therefore, while the generator G is operating, the horn switch 5
When closed, the half-wave current of one polarity of the alternating current output of the generator coil 1 is passed through the current-carrying path 3 to the excitation coil 2, while the half-wave current of the other polarity is guided by the diode 16 to the short-circuit path 12 to excite it. Since the current does not flow to the coil 2, the number of times the excitation coil 2 is excited is one-half of the number of times the excitation coil 2 is excited by the full wave of the AC output of the generator coil 1, as in the previous embodiment.

In the above two embodiments, the diode 6 and the short-circuit path 12 with diode 16 each constitute a half-wave rectifier of the present invention.

As described above, according to the present invention, the alternating current output of the alternator is half-wave rectified and applied to the excitation coil of the horn, so the number of times the excitation coil is excited can be halved compared to the conventional method. Even if the frequency of the AC output current increases excessively due to the multipolarity of the AC generator, it is possible to match the number of excitations of the excitation coil to the natural diaphragm of the normal diaphragm of the horn. The diaphragm can be reliably blown without replacing the diaphragm with one having a high natural frequency, and can be provided at a low price as a whole.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an electric circuit diagram of the first embodiment, FIG. 2 is a longitudinal sectional side view of the horn, FIG.
The figure is an electrical circuit diagram of the second embodiment. G...Alternator, H...Horn, 1...Generating coil, 2...Exciting coil, 3...Electrifying path, 6...
...Diode as half-wave rectifier, 12, 16
...A short circuit and a diode that constitute half-wave rectification means.

Claims (1)

[Scope of utility model registration request] In a vehicle's horn circuit, which consists of a generator coil of an AC generator driven by the engine, an excitation coil of the horn, and a current-carrying path connecting these two coils, the AC output of the output coil is half-wave rectified. A horn circuit for a vehicle, characterized in that the energizing circuit is provided with half-wave rectification means for applying to the excitation coil.