JP2009126384A - Mounting structure for vehicular horn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular horn, in which flexibility in its mounting position to a car body is improved, and sound pressure reduction or actuation voltage rise due to mounting is reduced. <P>SOLUTION: The vehicular horn 1 is provided with a vibration generating unit H housed in a casing 2, and a resonance unit S. A horn stay 4 fixed on the car body is composed of a long plate member. In the horn 1, a bent curvature part 4c is formed between a base end part 4a to which the horn 1 is fixed in an overhanging way and a tip end part 4d fixed to the car body. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention belongs to the technical field of a mounting structure for a vehicle horn mounted on a vehicle such as a motorcycle or a passenger car.

  In general, when a vehicle horn having a vibration generating portion accommodated in a casing is attached to a vehicle casing (vehicle body), a stay for mounting the vehicle body is provided on the casing, and the stay is fixed to the vehicle body side by a fixing means such as a screw. It is fixed.

As such, the base end portion of the stay formed in the long plate-like body is screwed to the portion that is provided in the casing in a penetrating manner and exposed to the outside of the fixed iron core that constitutes the vibration generating portion, The thing fixed to the vehicle body through the screw hole established in the front-end | tip part is proposed.
JP-A-11-143475

By the way, the horn blows when the diaphragm vibrates at a predetermined frequency (frequency) in accordance with the vibration of the vibration generating portion, and the horn is attached to the base end portion of the flat plate-like stay like the conventional one. In a case where the cantilever is supported and the tip of the stay is screwed and fixed to the vehicle body, when the horn is blown (vibrated) by supplying power, the vibration of the horn propagates to the stay. In this case, the stay has a vibration frequency (resonance frequency) set by the plate thickness, the plate width, and the distance between the casing fixing portion and the vehicle body fixing portion. When the vibration frequency approximates the frequency caused by blowing, the stay resonates due to the blowing of the horn, and the vibration energy of the horn itself is absorbed by the resonance of the stay. This causes problems.
On the other hand, when the horn is fixed to the vehicle body, depending on the installation conditions such as the mounting direction of the horn and the mounting space of the vehicle body, the stay may not be attached in the form of a flat plate like the conventional one. On the other hand, by bending the stay in the longitudinal direction, the attachment direction with the horn and the attachment direction with the vehicle body can be changed, and attachment corresponding to installation conditions may be possible. In this case, it is assumed that the bent portion bends at an angle of approximately 90 degrees. However, in this case, the stay is bent based on the vibration frequency with respect to the overall length of the stay and the bent portion. Vibration frequency with respect to the flat plate-like portion extending on both sides of the portion, that is, having a plurality of vibration frequencies, and is likely to be in a resonance state with respect to the frequency of the horn (diaphragm). Become. In such a case, as described above, problems such as a decrease in sound pressure and an increase in operating voltage occur, and there are problems to be solved by the present invention.

The present invention has been made in view of the above-described circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is directed to a vehicle horn in which a vibration generating portion is accommodated in a casing. In order to fix to the vehicle body via the above, the stay is made of a long plate material, one end portion where the horn is fixed in a cantilevered manner, the other end portion fixed to the vehicle body, the one end portion and the other end The vehicle horn mounting structure is characterized in that the connecting portion is connected to the portion at an angle of approximately 90 degrees, and the connecting portion is formed in a curved bent portion.
According to a second aspect of the present invention, in fixing a vehicle horn having a vibration generating portion in a casing to a vehicle body via a stay, the stay is constituted by a long plate material, and the horn is fixed in a cantilever manner. One end portion that is fixed to the vehicle body, and a connecting portion that offsets the one end portion and the other end portion in the plate thickness direction of the stay and connects them in a crank shape, the connecting portion being curved It is the attachment structure of the vehicle horn characterized by being formed in the shape bent part.
The invention according to claim 3 is characterized in that the bending radius of the bent portion is set to be at least four times the plate thickness of the stay, and the vehicle horn mounting structure according to claim 1 or 2 It is.

  By making it invention of Claim 1, 2, 3, it can prevent that the sound pressure of a horn is reduced, and can prevent the raise of an operating voltage.

Next, a first embodiment of the present invention will be described with reference to the drawings.
In the drawings, 1 is an electric horn, and the horn 1 is generated by a vibration generating unit (corresponding to a vibration generating portion of the present invention) H in which vibration generating means is accommodated, and the vibration generating unit H. The resonance unit S that resonates the vibration sound and generates a warning sound is fixed integrally as a butt.
The casing 2 constituting the vibration generating unit H is formed in a bottomed cylindrical shape that opens downward, and the small-diameter cylindrical portion 2b located on the bottom 2a side and the small-diameter cylindrical portion 2b are opened via a stepped portion 2c. The large-diameter cylindrical portion 2d formed on the end side is integrally formed with a concentric shape, and a flange portion 2e that expands toward the outer diameter side is integrally formed at the open end. And the fixed iron core 3 is arrange | positioned in the state which penetrates the bottom part 2a in the axial center part of the small diameter cylinder part 2b. The fixed iron core 3 has a base end 3a in which a screw groove is engraved and protrudes from the bottom 2a. The base end 3a has a horn stay for fixing a vehicle body described later (corresponding to a stay of the present invention). ) Adjusting the position of the fixed iron core 3 in the axial direction (vertical direction) relative to the casing 2 by inserting the through hole 4b opened in the base end portion (one end portion) 4a of 4 and tightening the nut 3b. While being supported freely, the horn stay 4 is set to be fixed to the casing 2.

  The small diameter cylindrical portion 2b of the casing 2 accommodates an exciting coil C configured by winding a winding 6 around a resin coil bobbin 5, and the coil bobbin 5 has a cylindrical hole facing in the vertical direction. The cylindrical portion 5a is provided, and a pair of flange portions 5b extending from both cylindrical ends of the cylindrical portion 5a to the outer diameter side. The exciting coil C is housed in a state where the fixed iron core 3 is inserted into the cylinder of the cylinder part 5a of the coil bobbin 5 and one flange part 5b is in contact with the casing bottom part 2a.

The flange portion 5b on the opening side of the casing 2 of the coil bobbin 5 is integrally formed with a mounting piece portion 5c and a terminal fixing piece portion 5d projecting toward the outer diameter side in a state of facing the radial direction. The piece 5c is fixed to the casing step 2c via a pin 2f. The terminal fixing piece 5d is fixed to the casing step 2c by first and second pins 2g and 2h made of a conductive member. The second pin 2h is provided with a base end portion of a fixed plate 7 and a movable contact 8a, each of which is made of a conductive plate material and provided with a fixed contact 7a for switching on and off the energization to the exciting coil C. A base end portion of the movable plate 8 is provided. The fixed plate 7 is provided in a state of being electrically connected to the second pin 2h, the movable plate 8 is insulated from the second pin 2h, and the other end of the winding 6 is electrically connected. It is provided in the state. As a result, the fixed contact 7a and the movable contact 8a are brought into contact with each other, whereby the second pin 2h and the other end of the winding 6 are brought into conduction, and current is set to flow through the exciting coil C. The fixed contact 7a and the movable contact 8a are configured to come into contact with the exciting coil C in a natural state where no power is supplied.
Reference numeral 9 denotes an external coupler to which an external power source is connected. The external coupler 9 includes first and second terminal plates 9a and 9b and first and second pins 2g accommodated in the external coupler 9. 2h is fixed to the casing step portion 2c in a state where electrical connection is made.

  An outer peripheral edge portion of the diaphragm 10 having spring characteristics is integrally fixed to an opening edge portion of the casing 2. The base end portion of the movable iron core 11 is integrally provided on the shaft core portion of the diaphragm 10, whereby the movable iron core 11 and the fixed iron core 3 are arranged side by side in the axial core direction. Between the tip surface 11a, which is the end surface facing the fixed iron core 3, and the tip surface (inner tip surface, lower end surface) 3c protruding inside (downward) the casing 2 of the fixed iron core 3 is supplied with power. In a natural state that is not performed, they are arranged in close proximity to each other with a predetermined gap G formed.

When the fixed core 3 is magnetized by supplying power (energized) and exciting the exciting coil C, the movable core 11 is attracted to the fixed core 3 side based on the spring characteristics (flexibility) of the diaphragm 10. Thus, the front end surface 11a of the movable iron core 11 and the front end surface 3c of the fixed iron core 3 are configured to be close to each other. Further, a step portion 11b corresponding to the contact interrupting means of the present invention is formed on the outer peripheral surface of the movable core 11, and the step portion 11b is based on the displacement of the movable core 11 to the fixed core 3 side. The movable plate 8 is forcibly displaced in the direction away from the fixed plate 7 so that the contact between the movable contact 8a and the fixed contact 7a is released. In this state, the energization to the exciting coil C is cut off, the fixed iron core 3 is demagnetized, and the movable iron core 11 is displaced away from the fixed iron core 3 so that the fixed contact 7a and the movable contact 8a are again applied. In contact with each other, the exciting coil C is energized. By repeating such an operation, the movable iron core 11 vibrates with the diaphragm 10 in the axial direction at a predetermined amplitude and frequency. It is configured to generate a frequency warning sound.
Reference numeral 12 denotes a cover body that covers the outer side of the diaphragm 10, and the cover body 12 is set so as to be crimped to the flange portion 2 e together with the diaphragm 10. A sound outlet 12 a is formed in the shaft core portion of the cover body 12, and the base end portion of the movable iron core 11 is loosely fitted into the sound outlet 12 a, and is based on the vibration of the diaphragm 10. The generated warning sound is set to be emitted (sound) from the sound output port 12a toward the outside (downward) of the cover body 12.

  On the other hand, the resonance unit S fixed in abutment manner below the vibration generating unit H is composed of a flat base body 13 and a frame body 14 that covers the base body 13 from the outside. The warning sound emitted from 12a reaches the sound path 14a formed between the base body 13 and the frame body 14 from the sound inlet 13a opened in the base body 13, and the sound path formed in a spiral shape. The sound is emitted to the outside from the sound emission opening 14b via 14a.

  The horn 1 formed in this way is fixed to the vehicle body via the horn stay 4, but in the present embodiment, the horn 1 has the resonance unit S positioned below and the vibration generating unit H positioned above. It is configured to be incorporated in the vehicle in a posture to do. The horn stay 4 includes a base end portion 4a on the base end side in the longitudinal direction of the long plate-like body, a tip end portion (the other end portion) 4d on the tip end side in the length direction, and a connecting portion therebetween. The bent portion 4c is formed. As described above, the longitudinal base end portion 4a is fixed and supported in a sandwiched manner between the casing bottom portion 2a and the base end portion 3a of the fixed iron core 3 penetrating the casing bottom portion 2a. The tip portion 4d is configured to be fixed to the vehicle body via a bolt (not shown), and a through hole 4e for inserting a bolt is formed in the fixing portion. As a result, the mounting direction of the horn 1 and the horn stay 4 (the direction in which the nut 3b is fastened) and the fixing direction to the vehicle body (the screwing direction of the bolt) are orthogonal to each other. It is comprised so that 1 can be fixed in the said attitude | position.

In this case, the bent portion 4c of the horn stay 4 is bent in a curved shape, and the curvature radius R of the inner portion of the bent portion 4c is a thickness when the thickness of the horn stay 4 is T. It is formed so as to have a curved shape set to be four times or more of T. In this case, the vibration frequency of the horn stay 4 includes the vibration frequency with respect to the entire length of the horn stay 4 and the vibration frequency with respect to the base side flat plate-like portion having a length L1 from the bent portion 4c to the through hole 4b of the base end portion 4a. The vibration frequency is set so as to have a vibration frequency with respect to the flat plate portion of the distal end side having a length L2 from the bent portion 4c to the through hole 4e of the distal end portion 4d.
By the way, the horn 1 of the present embodiment is adjusted to have a frequency of 400 Hz (Hertz). On the other hand, the horn stay 4 is bent at an intermediate portion in the longitudinal direction of a long plate material having a base end portion through hole 4b and a tip end through hole 4e having a length of about 60 mm, a plate thickness T of 2.3 mm, and a plate width of 22 mm. The portion 4c is formed. It is known that the horn stay 4 formed with such a plate thickness and plate width resonates with the frequency of the horn when the length of the flat plate portion becomes 35 mm.
And the horn stay 4 of this Embodiment makes the bending part 4c into the curved shape which makes the curvature radius R in an inner surface 10 mm or more of 4 times or more of board thickness T, The base end side of this bending part 4c The lengths L1 and L2 of the flat plate-like portions extending to the tip end side are configured to be shorter than the length that resonates with the frequency caused by the sound of the horn 1. Thereby, the vibration frequency which each of the base end side flat plate portion and the front end side flat plate portion has is set so as to be higher than the frequency due to the sound of the horn 1. Moreover, by shortening the lengths L1 and L2 of the base end side flat plate portion and the distal end side flat plate portion, the rigidity with respect to the vibration of each flat plate portion is increased, and the resonance with respect to the vibration due to the sound of the horn 1 is The vibration is weak and the sound pressure of the horn 1 is not impaired.

  In the present embodiment configured as described, the horn 1 is fixed to the base end portion 4a of the horn stay 4 in a cantilever manner, and is attached by fixing the tip end portion 4d of the horn stay 4 to the vehicle body. In the horn 1, since the stationary iron core 3 is intermittently magnetized by repeatedly exciting the exciting coil C and the diaphragm 10 is vibrated to generate a warning sound, the horn stay 4 also vibrates. In this case, the horn stay 4 has a bent portion 4c formed at the intermediate portion, and can be attached to a limited space of the vehicle body with good layout. In this way, when the bent portion 4c is formed in the horn stay 4, the proximal end side plate-like portion having the lengths L1 and L2 on the proximal end side and the distal end side of the bent portion 4 and the distal end side plate-like shape. When the horn 1 produces a sound, a specific vibration based on the lengths L1 and L2 is generated, but the bent portion 4c is formed in a curved shape, and the bent portion 4 is formed such that the inner radius of curvature R is at least four times the plate thickness T, the lengths L1 and L2 of the base side and the tip side flat plate-like portions can be set short, The vibration frequency in the part can be set to be higher than the frequency of the horn 1. Moreover, by increasing the radius of curvature R of the bent portion 4, the lengths of the base end side flat plate portion and the distal end side flat plate portion can be shortened, and the rigidity against vibration in these flat plate portions is increased. Therefore, the resonance with respect to the vibration caused by the sound of the horn 1 can be adjusted to a weak vibration, and a problem that the sound pressure of the horn 1 is impaired or the operating voltage is increased can be prevented.

  In FIG. 2, in the horn stay made of the same plate material as in the present embodiment, the radius of curvature of the inner surface of the bent portion is formed to be 1 time, 2.5 times, 5 times, and 10 times the plate thickness. FIG. 5 is a graph plotting acceleration in the vicinity of 400 Hz (horn frequency) when impulsive vibration is applied by providing cantilever-like loads on the base end of each horn stay. As is apparent from the graph, it is confirmed that by increasing the radius of curvature on the inner surface of the bent portion, the acceleration at a frequency near 400 Hz is reduced and the resonance state is reduced. It was confirmed that the characteristics became remarkable when the ratio was 5 times or more.

Of course, the present invention is not limited to the above-described embodiment, and the stay formed of a long plate material cantilever the horn at one end and fix the other end to the vehicle body. Any configuration may be used as long as the bent portion serving as a connecting portion for connecting the one end portion and the other end portion is formed in a curved shape, and the second and third embodiments shown in FIGS. it can.
The horns 15 and 16 of the second and third embodiments are configured in the same manner as the first embodiment except for the shape of the horn stays 17 and 18, and are the same as those of the first embodiment. The description is omitted by attaching the reference numeral. Further, the horn stays 17 and 18 of the second and third embodiments are formed with bent portions 17a, 18a, and 18b as connecting portions for connecting one end side and the other end side in the middle portion in the longitudinal direction, respectively. However, when each of the horn stays 17 and 18 is formed into a flat plate shape, the shape is the same as that of the first embodiment.
In the second embodiment, the radius of curvature R2 of the inner surface of the bent portion 17a of the horn stay 17 is set to 10 times the plate thickness T. In this case, the length L3 of the base side flat plate portion with respect to the bent portion 17a and the length L4 of the tip side flat plate portion can be further shortened, and are shown in the graph of FIG. As described above, the resonance state of the horn stay 15 is reduced, and a decrease in sound pressure based on resonance can be further reduced as compared with the horn 1 of the first embodiment, and an increase in operating voltage can be suppressed.
Further, the horn stay 18 of the third embodiment has first and second bent portions 18a and 18b at two locations so that the connecting portion of the middle portion in the longitudinal direction has a crank shape offset in the plate thickness direction. Is formed. The first and second bent portions 18a and 18b are set so that the radius of curvature R3 and R4 of the inner surface is set to four or more times the plate thickness T, respectively, and the length L5 of the base end side plate-like portion, In this case, the resonance state of the horn stay 18 can be reduced, the sound pressure drop can be further reduced, and the operating voltage rise can be suppressed.

It is sectional drawing of an electric horn. It is a graph which shows the relationship between the curvature radius of the inner surface in the bending part of a horn stay, and the acceleration in 400HZ when the impulse vibration of this horn stay is provided. It is sectional drawing of the electric horn in 2nd embodiment. It is sectional drawing of the electric horn in 3rd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Horn 2 Casing 3 Fixed iron core 4 Horn stay 4a Base end part 4c Bending part 4d Tip part 7 Fixed plate 8 Movable plate 10 Diaphragm C Excitation coil H Vibration generating unit S Resonance unit

Claims (3)

  In fixing a vehicle horn having a vibration generating part accommodated in a casing to a vehicle body via a stay, the stay is constituted by a long plate material, one end portion where the horn is fixed in a cantilever shape, and the vehicle body And a connecting portion that connects the one end portion and the other end portion at an angle of approximately 90 degrees, and the connecting portion is formed in a curved bent portion. A mounting structure for a vehicle horn, characterized by comprising:   When fixing a vehicle horn formed by excluding a vibration generating portion to a casing to a vehicle body via a stay, the stay is composed of a long plate material, one end portion where the horn is fixed in a cantilever shape, and the vehicle body And a connecting portion that connects the one end portion and the other end portion in the plate thickness direction of the stay and connects them in a crank shape. The connecting portion is formed in a curved bent portion. The mounting structure of the vehicle horn characterized by the above-mentioned.   The vehicle horn mounting structure according to claim 1 or 2, wherein the bent portion has a radius of curvature at an inner surface set to at least four times the plate thickness of the stay.

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