阅读说明：本技术 车辆用报警器 (Alarm for vehicle ) 是由 土井聪士 前桥祐哉 于 2018-12-10 设计创作，主要内容包括：车辆用报警器(1)在具有开口部(112a)的外壳(11)内具有：通过通电而产生磁力的线圈(20)、固定铁芯(22)、以及可动铁芯(4),该可动铁芯通过向线圈(20)通电所产生的磁吸引力沿轴向朝向固定铁芯(22)位移。车辆用报警器(1)具有振动板(3),该振动板以覆盖开口部(112a)的方式固定于外壳(11)和可动铁芯,并随着可动铁芯(4)的轴向的位移而振动、从而使空气振动。在振动板(3)上设置有作为通孔的通气孔(30)。在振动板(3)上设置有从外部覆盖通气孔(30)的过滤器(6)。能够抑制水膜在连通外壳内外的通气孔上的形成。(A vehicle alarm device (1) is provided with, in a housing (11) having an opening (112 a): the permanent magnet motor comprises a coil (20) which generates magnetic force by electrification, a fixed iron core (22), and a movable iron core (4) which is displaced toward the fixed iron core (22) in the axial direction by magnetic attraction force generated by electrification of the coil (20). The alarm device (1) for a vehicle has a vibration plate (3) which is fixed to a housing (11) and a movable iron core so as to cover an opening (112a), and vibrates in accordance with the axial displacement of the movable iron core (4) to vibrate air. A vent hole (30) is provided as a through hole in the diaphragm (3). A filter (6) for covering the ventilation hole (30) from the outside is provided on the vibration plate (3). The formation of a water film on the vent hole communicating the inside and outside of the case can be suppressed.)

1. An alarm for a vehicle, comprising:

a housing (11) having an opening (112 a);

a coil (20) which is accommodated in the housing and generates a magnetic force by being energized;

a fixed core (22) accommodated in the housing;

a movable iron core (4) that is displaced in the axial direction toward the fixed iron core by a magnetic attraction force generated by energizing the coil;

a vibration plate (3; 103) which is fixed to the housing and the movable core so as to cover the opening, and vibrates in accordance with the axial displacement of the movable core, thereby vibrating air; and

and a filter (6) provided on the vibration plate so as to cover a vent hole (30) penetrating the vibration plate from the outside.

2. An alarm for a vehicle, comprising:

a housing (11) having an opening (112 a);

a coil (20) which is accommodated in the housing and generates a magnetic force by being energized;

a fixed core (22) accommodated in the housing;

a movable iron core (4) that is displaced in the axial direction toward the fixed iron core by a magnetic attraction force generated by energizing the coil;

a vibration plate (203) that is fixed to the housing and the movable core so as to cover the opening, and vibrates in accordance with the axial displacement of the movable core, thereby vibrating air; and

and a filter (106) provided on the vibration plate so as to fill a vent hole (30) penetrating the vibration plate in the entire axial direction.

3. The alarm device for a vehicle according to claim 1 or 2, wherein the vibrating plate has a shape having at least an inner flat plate portion (31b) provided near a fixed portion (31a) that contacts the movable core, an outer flat plate portion (31d) provided radially outward of the inner flat plate portion, and an intermediate bent portion (31c) that connects the inner flat plate portion and the outer flat plate portion;

the vent hole and the filter are provided in the outer flat plate portion.

4. The vehicle alarm device according to claim 3, wherein the vent hole and the filter are provided in the outer flat plate portion at a position closer to an outer peripheral edge of the outer flat plate portion than the intermediate bent portion.

5. The vehicle alarm according to claim 3 or 4, wherein the outer flat plate portion is a flat plate portion having a longest radial length in a longitudinal section of the vibration plate along the axial direction.

6. The alarm for a vehicle according to claim 1, wherein the vent hole and the filter are provided in the vibration plate at an outer peripheral edge side bent portion (31e) located on an outermost peripheral edge side than a fixing portion (31a) that contacts the movable iron core.

7. The alarm for a vehicle according to claim 1 or 2, wherein the vent hole and the filter are provided on a longest flat plate portion (31 d; 131b) having a longest radial length in a longitudinal section of the vibration plate along the axial direction.

8. The alarm device for a vehicle according to claim 7, wherein the vibrating plate has a shape having at least an inner flat plate portion (131b) provided near a fixed portion (31a) that contacts the movable iron core, an outer flat plate portion (131d) provided radially outward of the inner flat plate portion, and an intermediate bent portion (131c) that connects the inner flat plate portion and the outer flat plate portion;

the inner flat plate portion is the longest flat plate portion.

9. The alarm for a vehicle according to claim 8, wherein the vent hole and the filter are provided in the inner panel portion closer to a fixing portion (31a) that contacts the movable iron core than the intermediate bent portion.

10. The alarm for a vehicle according to any one of claims 1 to 9, comprising a soundboard (9) that amplifies a sound generated when the movable core collides with the fixed core;

the filter is located radially inward of an outer peripheral edge (90) of the soundboard.

11. The alarm for a vehicle according to any one of claims 1 to 10, wherein the filter has water repellency.

Technical Field

The present disclosure relates to a vehicle alarm device that generates a warning sound.

Background

Patent document 1 discloses a horn for a vehicle. A through cylindrical hole is formed in a housing of a vehicle horn, and a mounting hole formed in a coil bobbin is fitted to the outside of the through cylindrical hole. The through cylinder hole also serves as a vent hole. A filter having a waterproof function is provided in a bent piece portion penetrating a cylindrical hole in a housing so as to seal the cylindrical hole.

Disclosure of Invention

In the vehicle horn of patent document 1, when the housing is exposed to water from the outside, a water film may be formed in the through-hole due to the surface tension of the water. On the other hand, if a water film is formed on the through-cylindrical hole, the air inside and outside the housing is obstructed, and the through-cylindrical hole cannot function as a vent hole.

An object of the present disclosure is to provide a vehicle alarm device capable of suppressing formation of a water film in a vent hole communicating the inside and outside of a housing.

Disclosed is an alarm for a vehicle, including: a housing having an opening; a coil which is accommodated in the housing and generates a magnetic force by energization; a fixed core accommodated in the housing; a movable iron core which is displaced toward the fixed iron core in the axial direction by a magnetic attraction force generated by energizing the coil; a vibration plate which is fixed to the case and the movable core so as to cover the opening, and vibrates in accordance with axial displacement of the movable core, thereby vibrating air; and a filter provided on the vibrating plate so as to cover the air hole penetrating the vibrating plate from the outside.

According to this alarm for a vehicle, the filter is provided on the vibrating plate so as to cover the vent hole penetrating the vibrating plate from the outside, so that when water comes into contact with the vent hole from the outside, the filter can suppress the water from entering the vent hole. Thus, since water is less likely to enter the vent holes, the water in the vent holes can be inhibited from forming a water film due to surface tension. Therefore, the vehicle alarm device can be provided that can suppress the formation of a water film on the vent hole that communicates the inside and outside of the housing.

Disclosed is an alarm for a vehicle, including: a housing having an opening; a coil which is accommodated in the housing and generates a magnetic force by energization; a fixed core accommodated in the housing; a movable iron core which is displaced toward the fixed iron core in the axial direction by a magnetic attraction force generated by energizing the coil; a vibration plate which is fixed to the case and the movable core so as to cover the opening, and vibrates in accordance with axial displacement of the movable core, thereby vibrating air; and a filter provided on the vibration plate so as to fill a vent hole penetrating the vibration plate in the entire axial direction.

According to this alarm for a vehicle, with the structure of the filter provided in the vibrating plate and filling the vent hole of the vibrating plate in the entire axial direction, when water comes into contact with the vent hole from the outside, the filter can prevent the surface tension of the water from acting on the entire vent hole. Thus, since a water film due to the surface tension of water cannot be formed in the vent hole, a vehicle alarm device capable of suppressing the formation of a water film in the vent hole communicating the inside and outside of the housing can be provided.

Drawings

Fig. 1 is a longitudinal sectional view showing the structure of a vehicle alarm device of a first embodiment.

Fig. 2 is a front view of the vehicle alarm device of the first embodiment as viewed from behind.

Fig. 3 is a partial longitudinal sectional view showing a vent hole and a filter provided on a vibration plate.

Fig. 4 is a schematic diagram of the relationship between the shape of the vibration plate and the stress distribution.

Fig. 5 is a diagram illustrating the shape of the diaphragm according to the second embodiment.

Fig. 6 is a partial longitudinal sectional view showing a filter provided on a vibration plate of a third embodiment.

Detailed Description

Hereinafter, a plurality of embodiments for implementing the present disclosure will be described with reference to the drawings. In each of the embodiments, the same reference numerals are used for portions corresponding to the matters described in the previous embodiment, and redundant description may be omitted. In the case where only a part of the structure is described in each embodiment, other embodiments described above may be employed for other parts of the structure. In each embodiment, combinations of parts that can be combined are not specifically specified, and combinations of parts between embodiments can be combined even if not specified, as long as the combinations are not particularly hindered.

(first embodiment)

A vehicle alarm device 1 according to a first embodiment will be described with reference to fig. 1 to 3. For example, the device is mounted on a vehicle such as an automobile or a motorcycle and generates a warning sound to the outside, and is also called an electromagnetic horn. The vehicle alarm device 1 emits a warning sound to the outside of the vehicle when a predetermined operation unit in the vehicle is operated. The predetermined operation portion is a horn switch provided on, for example, a steering device or a steering wheel, which is operated by the driver. The vehicle alarm 1 is an electromagnetic alarm that generates an alarm sound corresponding to an output voltage.

As shown in fig. 1, the vehicle alarm 1 is mounted on a front portion of a vehicle, for example, a vehicle-side member such as a front portion of a radiator, via a bracket 5. The vehicle alarm 1 is mounted on a vehicle in a state in which the movable iron core 4 is positioned further forward than the fixed iron core 22 and the axial directions of the movable iron core 4 and the fixed iron core 22 are aligned in the front-rear direction. The vehicle alarm 1 includes: the electromagnetic coil unit includes a housing 11 having a cylindrical shape, and an electromagnetic coil unit 2 accommodated and fixed in the vicinity of the center in the housing 11. The alarm device 1 for a vehicle is a plate-shaped member having a vibrating plate 3 fixed to a housing 11 so as to cover an opening of the housing 11 constituting an outer contour. The vibration plate 3 is also referred to as a diaphragm. The diaphragm 3 vibrates in accordance with the axial displacement of the movable iron core 4, and the air is vibrated by the vibration. The electromagnetic coil unit 2 includes a coil 20, a bobbin 21, and a fixed core 22. The coil 20 is formed by winding a coil around a bobbin 21 made of resin.

The alarm 1 for a vehicle includes: a movable iron core 4 fixed near the center of the diaphragm 3 and disposed opposite to the fixed iron core 22; and a bracket 5 fixed to the bottom of the housing 11 and mounted on a vehicle or the like. The solenoid section 2 is disposed around the axis of the case 11. The case 11 and the diaphragm 3 are formed by press-molding a plate material of an iron-based magnetic material into a concave shape in order to constitute a part of a magnetic circuit of the electromagnetic coil unit 2. The center hole 3a of the diaphragm 3 is fitted into the center hole of the resonance plate 9 in the small diameter portion 41 located in the front portion of the movable core 4, and the movable core 4 is fixed to the diaphragm 3 and the resonance plate 9 by caulking.

The housing 11 has: a disk-shaped bottom portion 110 located at the rear end, an intermediate flat portion 111 formed by cylindrically rising from the periphery of the bottom portion 110 and having a disk-shaped protruding front end portion, and an outer peripheral edge portion 112 located at the front end are integrally formed. The outer peripheral edge 112 is formed by protruding from the peripheral edge of the intermediate flat portion 111 toward the front end portion formed by rising in a front cylinder shape. The outer peripheral edge of the diaphragm 3 is crimped so as to be crimped to the outer peripheral edge 112, and is fixed to the housing 11.

As shown in fig. 1 to 3, the diaphragm 3 is provided with a vent hole 30 penetrating in the thickness direction thereof. The vent hole 30 constitutes a communication passage that communicates the inside of the vehicle alarm 1 with the outside. A filter 6 covering the vent hole 30 is provided in front of, i.e., outside the diaphragm 3. The filter 6 is integrally fixed to the peripheral surface of the vent hole 30 of the diaphragm 3 with an adhesive 6a in a state of completely covering the vent hole 30 at the front.

The filter 6, for example, inhibits dust, dirt, sand, and the like from entering the inside from the outside of the housing 11. The filter 6 has air permeability and water repellency. The surface of the filter 6 is subjected to water repellent treatment. The water repellent treatment is provided by coating with a fluororesin or a silicone resin, for example. When the diaphragm 3 encounters water, the filter 6 plays a role of flicking water flowing into the vent hole 30 or blocking water from penetrating into the vent hole 30. The vent 30 and filter 6 allow air to enter and exit the housing 11. The air inflow and outflow occurs when the internal pressure of the case 11 fluctuates due to vibration of the diaphragm 3 accompanying axial displacement of the movable core 4, as will be described later.

As shown in fig. 1 and 4, the diaphragm 3 is formed by integrally providing a fixed portion 31a that contacts the movable core 4, an inner flat plate portion 31b that is radially outward of the fixed portion 31a, an outer flat plate portion 31d that is radially outward of the inner flat plate portion 31b, and an intermediate bent portion 31 c. The diaphragm 3 is further provided with an outer peripheral edge side bent portion 31e located on the outermost peripheral edge side. Therefore, the diaphragm 3 is a plate-shaped member integrally formed in this order from the center axis toward the radial outside with the fixing portion 31a, the inner flat plate portion 31b, the intermediate bent portion 31c, the outer flat plate portion 31d, the outer peripheral edge side bent portion 31e, and the outer peripheral edge portion of the diaphragm 3. The radially outer side means a direction closer to the outer peripheral edge or a side closer to the outer peripheral edge than the center axis of the diaphragm 3.

The fixing portion 31a is fixed to the movable core 4 by being sandwiched between the swaged small diameter portion 41 and a portion of the movable core 4 on the rear side of the small diameter portion 41. The fixing portion 31a is a disk-shaped portion integrally fixed to the movable core 4 together with a peripheral portion of the center hole portion of the sounding board 9. The fixed portion 31a is a portion that moves integrally with the movable core 4 by the axial displacement of the movable core 4. Therefore, the fixed portion 31a is a portion where stress generated by vibration of the movable iron core 4 is smaller than that of the inner flat plate portion 31b, the intermediate bent portion 31c, the outer flat plate portion 31d, and the like.

The inner flat plate portion 31b is an annular flat plate portion provided around the fixing portion 31a in the vicinity of the fixing portion 31a in the diaphragm 3. That is, the inner flat plate portion 31b is a flat plate portion of the diaphragm 3 located closer to the fixing portion 31a or the central axis than the outer peripheral edge portion. The inner flat plate portion 31b is a flat plate portion located radially inward of the outer flat plate portion 31d, among the flat plate portions provided to the diaphragm 3. The radially inner side is a side opposite to the radially outer side, and is a side closer to the central axis than the outer peripheral edge of the diaphragm 3 or a side closer to the central axis.

The inner flat plate portion 31b has a longitudinal sectional shape such that a radially inner portion thereof is located further forward of the vehicle alarm 1 or closer to the soundboard 9 than a radially outer portion thereof. The longitudinal sectional shape is a shape obtained when the diaphragm 3 is cut along a plane in the axial direction of the movable core 4. The inner flat plate portion 31b is shaped so as to be positioned further to the rear or further to the fixed core 22 side from the fixed portion 31a side toward the outer peripheral edge side.

Fig. 4 shows the relationship between the shape of the vibration plate 3 and the generated stress distribution. The solid line in the stress distribution diagram included in fig. 4 is a distribution of stress values when movable iron core 4 is attracted toward fixed iron core 22, and the broken line is a distribution of stress values when movable iron core 4 is repelled away from fixed iron core 22. As shown in fig. 4, in the inner flat plate portion 31b, the stress increases as the position closer to the fixed portion 31a, and the stress increases rapidly in the vicinity of the fixed portion 31 a. The intermediate bent portion 31c is a portion connecting the inner flat plate portion 31b and the outer flat plate portion 31 d. In the inner flat plate portion 31b, the stress increases as the position closer to the intermediate bent portion 31c, and the stress increases rapidly in the vicinity of the intermediate bent portion 31 c. The intermediate bent portion 31c has the largest stress at both the time of attraction and the time of repulsion in the entire vibration plate 3. In this way, the diaphragm 3 tends to have a higher stress as it is closer to a bent portion or a bent portion that is a changing portion in which the inclination of the adjacent flat plate portions changes.

The stress on the fixed portion 31a side tends to be smaller than the stress on the intermediate bent portion 31c side in the inner flat plate portion 31 b. This is because the fixed portion 31a is a portion that moves integrally with the movable core 4, and therefore, the stress becomes smaller than the intermediate bent portion 31c that easily moves freely. Therefore, from the viewpoint of securing the strength of the diaphragm 3, the vent hole 30 and the filter 6 are preferably provided in the inner flat plate portion 31b on the fixing portion 31a side of the intermediate bent portion 31 c. The vent hole 30 and the filter 6 are preferably provided in the middle of the middle bent portion 31c and the fixed portion 31a of the inner flat plate portion 31b, which are downwardly convex due to stress shown in fig. 4. The relationship between the stress and the stress in each portion described above can be said to apply to both the attraction and the repulsion.

The outer flat plate portion 31d is an annular flat plate portion provided around the inner flat plate portion 31b at the outer peripheral edge of the diaphragm 3 with respect to the fixing portion 31 a. The outer flat plate portion 31d is a flat plate portion located radially outward of the inner flat plate portion 31b, among flat plate portions provided in the diaphragm 3. The outer flat plate portion 31d is the longest flat plate portion having the longest radial length in a longitudinal cross section of the diaphragm 3 along the axial direction. The outer flat plate portion 31d is longer in radial length than the inner flat plate portion 31b in the longitudinal section described above. With this configuration, as shown in fig. 4, the stress acting on the outer flat plate portion 31d is relatively smaller than the stress acting on the inner flat plate portion 31 b. The outer flat plate portion 31d has a shape that is located further forward or further toward the outer peripheral edge side than the intermediate bent portion 31c side or further toward the soundboard 9 side.

In the outer flat plate portion 31d, the stress increases at a portion closer to the intermediate bent portion 31c, and the stress decreases rapidly when the outer flat plate portion advances radially outward from the intermediate bent portion 31c, both at the time of attraction and at the time of repulsion. The minimum value of the stress of the outer flat plate portion 31d is smaller than the minimum value of the stress of the inner flat plate portion 31 b. In this way, the vent hole 30 and the filter 6 are preferably provided in the outer flat plate portion 31d of the diaphragm 3 located radially outward of the inner flat plate portion 31 b.

In the outer flat plate portion 31d, the stress on the outer peripheral edge side bent portion 31e side tends to be smaller than the stress on the intermediate bent portion 31c side. This is because the outer peripheral edge side bent portion 31e is a portion close to the outer peripheral edge portion of the diaphragm 3 fixed to the outer peripheral edge portion 112 of the housing 11, and therefore the fluctuation thereof is small, and the stress is small compared to the intermediate bent portion 31c which is easily freely fluctuated. Therefore, from the viewpoint of securing the strength of the diaphragm 3, the vent hole 30 and the filter 6 are preferably provided in the outer flat plate portion 31d on the outer peripheral edge side bent portion 31e side of the intermediate bent portion 31c side. The vent hole 30 and the filter 6 are preferably provided in the outer flat plate portion 31d at a position intermediate between the intermediate bent portion 31c and the outer peripheral edge side bent portion 31e, and the stress at the time of repulsion and the stress at the time of attraction are reversed at the intermediate position as shown in fig. 4.

The bobbin 21 has a cylindrical portion 210, a flange portion 211 protruding from an end of the cylindrical portion 210 on the diaphragm 3 side in a disc shape, a first fixed portion 212 protruding outward from the flange portion 211, a second fixed portion, and the like, and is integrally formed. The coil 20 formed by winding a winding wire is provided on the outer peripheral surface of the cylindrical portion 210. A fixed core 22 is provided inside the cylindrical portion 210 concentrically with the bobbin 21 and the coil 20. In the bobbin 21, the flange portion 211 forms an end surface extending from the distal end of the cylindrical portion 210 to the periphery. The flange 211 covers the tip of the coil 20 and the end of the diaphragm 3.

A bobbin 21 having a fixed core 22 and a coil 20 is provided on the front side of the bottom portion 110 of the housing 11. The front end surface of the fixed iron core 22 faces the front end surface of the movable iron core 4. The fixed core 22 is present inside the cylindrical portion 210 of the bobbin 21. In other words, the side surface of the fixed core 22 is surrounded by the cylindrical portion 210.

When the coil 20 is not energized, a gap of a predetermined distance, that is, a so-called air gap, is formed between the front end surface of the fixed core 22 and the front end surface of the movable core 4 facing the front end surface. Therefore, when the coil 20 is not energized, the front end surface of the fixed core 22 is separated from the front end surface of the movable core 4.

The first fixed part 212, the movable contact support plate 7 made of a metal spring material having elasticity, and the conductive metal fixed contact support plate 8 are laminated on the intermediate flat part 111 of the housing 11. An insulating member is interposed between the movable contact support plate 7 and the fixed contact support plate 8. These laminated members are integrally fixed by caulking with a first metal rivet 91 fixed to the intermediate flat portion 111. One end portion of the winding wire extending from the coil 20 is disposed between the movable contact support plate 7 and the first fixed part 212 in a state where an insulating film covering the conductor is peeled off, and is pressed by the head of the first rivet 91 in accordance with the caulking fixation of the first rivet 91. Thus, one end portion of the winding wire is conducted to the movable contact support plate 7.

The second fixed portion is laminated on the other part of the intermediate flat portion 111. The second fixed portion is fixed to the housing 11 by caulking with a second metal rivet fixed to the intermediate flat portion 111. The other end portion of the winding wire extending from the coil 20 in the electromagnetic coil unit 2 is provided along the periphery of the shaft portion of the second rivet with the insulating film covering the conductor peeled off, and is crimped to the head portion of the second rivet in accordance with the caulking fixation of the second rivet. In this way, by the other end portion of the wire being crimped to the head of the second rivet, the conductor at the end portion of the wire is conducted with the second rivet. Here, the conductor of the winding is made of a copper wire, a conductive material other than a copper wire, or a material in which different conductive materials are combined. The bobbin 21 is fixed to the housing 11 at two positions, i.e., the first rivet 91 and the second rivet.

Also, the second rivet is insulated from the housing 11 by an insulating member. The second rivet is in conduction with the connector terminal inside the connector 13. The positive potential of the battery is directed to the connector terminal via the horn switch. Therefore, the second rivet is a rivet located on the current input side in the solenoid portion 2. The vehicle alarm 1 may further include a connector terminal that is electrically connected to a terminal end portion of the winding wire pressed against the movable contact support plate 7 by caulking of the first rivet 91.

The movable contact support plate 7 is provided with a movable contact portion protruding toward the fixed contact support plate 8. The fixed contact support plate 8 is provided with a fixed contact portion projecting toward the movable contact support plate 7 at a position corresponding to the movable contact portion. The movable contact portion and the fixed contact portion are disposed to be opposed to each other in the axial direction. When the coil 20 is not energized, the movable contact portion is pressed toward the fixed contact support plate 8 by the spring force of the movable contact support plate 7, and forms a normally closed contact which is in contact with the fixed contact portion.

A large diameter portion 42 protruding radially outward from the other portions is formed on the entire outer peripheral surface of the movable core 4. For example, the large diameter portion 42 is integrally formed by cold forging or the like. The fixed core 22 magnetized when the coil 20 is energized attracts the movable core 4, and the large diameter portion 42 is displaced rearward, that is, toward the fixed core 22. Therefore, the large diameter portion 42 constitutes a pressing portion that is brought into contact with the pressed portion of the movable contact support plate 7 near the horn center portion and presses the pressed portion rearward, that is, toward the fixed core 22. The pressed portion is pressed toward the fixed core 22 by the large diameter portion 42, so that the fixed contact portion 80 and the movable contact portion 70 are separated from each other, and the contact state therebetween is released.

The small diameter portion 41 of the front portion of the movable iron core 4 is caulked in a state of being inserted into the center portion of the diaphragm 3, whereby the movable iron core 4 is fixed to the diaphragm 3. The fixed core 22 is fixed to the mounting bracket 5 together with the center portion of the bottom portion 110 of the housing 11 by a fixing method such as caulking. The fixed core 22 may be fixed to the bracket 5 together with the center portion of the bottom portion 110 of the housing 11 by a method such as nut fastening.

Next, the operation of the vehicle alarm 1 will be described. When the horn switch is turned on, the current from the in-vehicle power supply flows through the second rivet, the other end portion of the winding, and the coil 20 in this order from the connection terminal. Further, the current flows through the one end portion of the winding, the movable contact support plate 7, the movable contact portion, the fixed contact support plate 8, the first rivet 91, the housing 11, the fixed core 22, the bracket 5, and the vehicle body (ground) in this order.

In the alarm 1 for a vehicle, the other end portion of the winding wire is electrically connected to the second rivet, and the one end portion of the winding wire is electrically connected to the movable contact support plate 7. Thereby, the electromagnetic force of the electromagnetic coil unit 2 acts on the gap between the movable iron core 4 and the fixed iron core 22, and the movable iron core 4 is attracted to the fixed iron core 22. When the movable core 4 moves in the axial direction due to the magnetic attraction force generated by the fixed core 22, the diaphragm 3 moves and deforms in a state where the peripheral edge portion is fixed and the center portion moves integrally with the movable core 4. By such displacement of the movable iron core 4, the large diameter portion 42 of the movable iron core 4 presses the pressed portion of the movable contact supporting plate 7, and the movable contact portion is separated from the fixed contact portion. As a result, the current supply to the solenoid portion 2 is interrupted and the electromagnetic force disappears, so that the movable iron core 4 is returned to the original position by the elastic force of the diaphragm 3, and the closed state between the movable contact portion and the fixed contact portion is restored. When the voltage applied to the coil 20 increases, the movable iron core 4 approaches the fixed iron core 22 due to the magnetic attraction force from the fixed iron core 22. By repeating these operations, the movable core 4 repeatedly collides with the fixed core 22, and the diaphragm 3 and the soundboard 9 vibrate at high frequencies, whereby sound waves are emitted forward.

The operation and effect of the vehicle alarm device 1 according to the first embodiment will be described. The vehicle alarm 1 includes: a case 11 having an opening 112a, a coil 20 accommodated in the case 11 and generating a magnetic force by energization, and a fixed core 22 accommodated in the case 11. The alarm 1 for a vehicle further includes: a movable iron core 4 that is displaced in the axial direction toward the fixed iron core 22 by a magnetic attractive force generated by energizing the coil 20; and a diaphragm 3 fixed to the case 11 and the movable core 4 so as to cover the opening 112 a. The diaphragm 3 vibrates with the axial displacement of the movable core 4, and vibrates air. The vehicle alarm 1 further includes a filter 6 provided on the vibrating plate 3 so as to cover the vent hole 30 penetrating the vibrating plate 3 from the outside.

According to the vehicle alarm 1, the filter 6 is provided on the vibrating plate 3 so as to cover the ventilation hole 30 of the vibrating plate 3 from the outside, so that when water comes into contact with the ventilation hole 30 from the outside, the filter 6 can suppress the water from entering the ventilation hole. Since water is less likely to enter the vent holes 30, the surface tension of water is less likely to act in the vent holes 30. This can prevent the formation of a water film in the vent hole 30. According to the vehicle alarm 1, since the formation of a water film on the vent hole 30 communicating the inside and the outside of the housing 11 can be suppressed, the vent hole 30 and the filter 6 exhibiting desired air permeability can be provided. Further, when the filter 6 has water repellency, the water is repelled by the filter 6, and therefore the flow of the water that passes through the filter 6 and enters the vent hole 30 can be further inhibited.

The diaphragm 3 has a shape including at least an inner flat plate portion 31b, an outer flat plate portion 31d, and an intermediate bent portion 31c, the inner flat plate portion 31b being provided near a fixed portion 31a that contacts the movable core 4, the outer flat plate portion 31d being provided radially outward of the inner flat plate portion 31b, and the intermediate bent portion 31c connecting the inner flat plate portion 31b and the outer flat plate portion 31 d. The vent hole 30 and the filter 6 are provided in the outer flat plate portion 31 d. According to this configuration, since the vent hole 30 and the filter 6 are provided in the outer flat plate portion 31d away from the movable iron core 4 that fluctuates in the axial direction, they are provided in a portion where the displacement width is small and stress is suppressed compared to the inner flat plate portion 31 b. Therefore, according to this structure, the diaphragm 3 can be provided in which a decrease in strength due to the formation of the vent holes 30 can be suppressed.

The vent hole 30 and the filter 6 are provided in the outer flat plate portion 31d at a position closer to the outer peripheral edge of the outer flat plate portion 31d than the intermediate bent portion 31 c. According to this configuration, the vent hole 30 and the filter 6 are provided in the outer flat plate portion 31d on the outer peripheral edge side away from the middle bent portion 31c where the stress is increased, and therefore, are provided in the portion of the outer flat plate portion 31d where the stress is suppressed. Therefore, according to this structure, the diaphragm 3 can be provided in which the strength reduction due to the formation of the vent holes 30 can be further suppressed.

The vent hole 30 and the filter 6 are provided in the diaphragm 3 closer to an outer peripheral edge side bent portion 31e on the outermost peripheral edge side than a fixing portion 31a in contact with the movable iron core 4. According to this configuration, since the vent hole 30 and the filter 6 are provided closer to the outer peripheral edge side bent portion 31e of the diaphragm 3 than the movable iron core 4 that fluctuates in the axial direction, they are provided at a portion where the displacement width is small and stress is suppressed compared to the fixed portion 31a side. Therefore, according to this structure, by forming the vent hole 30 at the portion where the stress is suppressed, the diaphragm 3 can be provided in which the decrease in strength is suppressed.

The vent hole 30 and the filter 6 are provided in the longest flat plate portion having the longest radial length in the longitudinal section of the vibration plate 3 along the axial direction. According to this structure, the vent hole 30 can be provided at a position where a distance from the bent portion or the bent portion of the vibration plate 3 where stress is large can be secured. With this configuration, the strength of the diaphragm 3 and the suppression of the ventilation failure can be both achieved.

The outer flat plate portion 31d in which the vent hole 30 and the filter 6 are provided is the longest flat plate portion having the longest radial length in the longitudinal cross section of the diaphragm 3 along the axial direction. According to this configuration, since the outer flat plate portion 31d is a flat plate portion having the longest radial length, the vent hole 30 can be provided at a position where a distance from the bent portion or the bent portion of the diaphragm 3 can be secured. Therefore, according to this configuration, the diaphragm 3 can be provided that achieves both the strength of the diaphragm 3 and the suppression of the ventilation failure.

The alarm 1 for a vehicle includes a soundboard 9 for amplifying a sound generated when the movable core 4 collides with the fixed core 22. The filter 6 is located radially inward of the outer peripheral edge 90 of the consoling plate 9. According to this structure, the front face of the filter 6 is covered with the soundboard 9. Thus, even if an external force acts on the filter 6, the filter 6 can be protected by the soundboard 9, and therefore, peeling, breakage, and the like of the filter 6 can be suppressed.

(second embodiment)

In a second embodiment, a diaphragm 103 according to another embodiment of the first embodiment will be described with reference to fig. 5. The second embodiment has the same configuration as the first embodiment, and the same reference numerals are given to fig. 5 to provide the same operational advantages, and only the differences from the first embodiment will be described below.

As shown in fig. 5, the diaphragm 103 is formed by integrally providing a fixed portion 31a, an inner flat plate portion 131b radially outward of the fixed portion 31a, an outer flat plate portion 131d radially outward of the inner flat plate portion 131b, and an intermediate bent portion 131 c. Therefore, the diaphragm 103 is a plate-shaped member integrally formed in this order from the central axis to the radially outer side, including the fixing portion 31a, the inner flat plate portion 131b, the intermediate bent portion 131c, the outer flat plate portion 131d, the outer peripheral edge side bent portion 31e, and the outer peripheral edge portion of the diaphragm 103. The fixed portion 31a is a portion where stress due to vibration of the movable core 4 is smaller than that of the inner flat plate portion 131b, the intermediate bent portion 131c, the outer flat plate portion 131d, and the like.

In the inner flat plate portion 131b, the stress is higher at a portion closer to the fixed portion 31a, and the stress rapidly increases in the vicinity of the fixed portion 31 a. The intermediate bent portion 131c is a portion connecting the inner flat plate portion 131b and the outer flat plate portion 131 d. In the inner flat plate portion 131b, the stress is higher at a portion closer to the intermediate bent portion 131c, and the stress rapidly increases in the vicinity of the intermediate bent portion 131 c. The middle bent portion 131c has the largest stress at both the time of attraction and the time of repulsion in the entire vibration plate 103. As described above, the diaphragm 103 also tends to have: the stress is higher as the stress is closer to a bent portion or a bent portion, which is a changing portion where the inclination of the adjacent flat plate portion changes.

The stress on the fixing portion 31a side tends to be smaller than the stress on the intermediate bent portion 131c side in the inner flat plate portion 131 b. Therefore, from the viewpoint of securing the strength of the diaphragm 103, the vent hole 30 and the filter 6 are preferably provided in the inner flat plate portion 131b on the fixing portion 31a side of the intermediate bent portion 131 c.

The inner flat plate portion 131b is the longest flat plate portion having the longest radial length in a longitudinal section of the vibration plate 103 along the axial direction. The inner flat plate portion 131b is longer in radial length than the outer flat plate portion 131d in the longitudinal cross section described above. With this configuration, the stress acting on the inner flat plate portion 131b is relatively smaller than the stress acting on the outer flat plate portion 131 d. Since the inner flat plate portion 131b is the longest flat plate portion having the longest radial length, the vent hole 30 and the filter 6 are located in the vibrating plate 103 closer to the fixing portion 31a than the radial center portion 131f located at the middle between the central axis and the outer peripheral edge side bent portion 31 e.

The outer flat plate portion 131d is an annular flat plate portion provided around the inner flat plate portion 131b at the outer peripheral edge of the diaphragm 103 with respect to the fixing portion 31 a. The outer flat plate portion 131d is a flat plate portion located radially outward of the inner flat plate portion 131b in the flat plate portion provided in the diaphragm 103. The outer flat plate portion 131d has a shape that is located further forward or further toward the outer peripheral edge side than the intermediate bent portion 131c side or further toward the soundboard 9 side.

In both the attraction and repulsion states of the outer flat plate portion 131d, the stress increases at a portion closer to the intermediate bent portion 131c, and the stress decreases rapidly as it advances radially outward from the intermediate bent portion 131 c.

The following describes operational effects of the vehicle alarm device according to the second embodiment. The vent hole 30 and the filter 6 are provided in the longest flat plate portion having the longest radial length in the longitudinal section of the vibration plate 103 along the axial direction. According to this structure, the vent hole 30 can be provided at a position where a distance from the bent portion or the bent portion in the vibration plate 103 where stress is large can be secured. Therefore, according to this structure, the vibration plate 103 can be provided that achieves both the strength of the vibration plate 103 and the suppression of the ventilation failure.

The diaphragm 103 has at least an inner flat plate portion 131b, an outer flat plate portion 131d, and an intermediate bent portion 131c, the inner flat plate portion 131b being provided near the fixing portion 31a, the outer flat plate portion 131d being provided radially outward of the inner flat plate portion 131b, and the intermediate bent portion 131c connecting the inner flat plate portion 131b and the outer flat plate portion 131 d. The inner flat plate portion 131b is the longest flat plate portion. According to this configuration, since the inner flat plate portion 131b is a flat plate portion having the longest radial length, the vent hole 30 can be provided at a position of the vibration plate 103 where the distance from the intermediate bent portion 131c having a large stress is most secured.

The vent hole 30 and the filter 6 are provided in the inner flat plate portion 131b closer to the fixing portion 31a than the intermediate bent portion 131 c. According to this structure, the vent hole 30 and the filter 6 are provided closer to the fixing portion 31a than the intermediate bent portion 131c where the stress tends to be the largest in the vibration plate 103, and therefore, are provided at a portion where the displacement width is small and the stress is suppressed. Therefore, according to this structure, the diaphragm 103 can be provided with suppressed strength reduction by forming the vent hole 30 at the portion where stress is suppressed.

(third embodiment)

In a third embodiment, a filter 106 according to another embodiment of the above-described embodiment will be described with reference to fig. 6. The third embodiment has the same configuration as the above-described embodiment, and the same operational advantages are provided by the same reference numerals as those in fig. 5, and only the differences from the above-described embodiment will be described below.

As shown in fig. 6, the filter 106 provided on the vibrating plate 203 according to the third embodiment is different in structure from the filter 6 according to the first embodiment. The structure, the longitudinal sectional shape, and the operational effects of each portion of the diaphragm 203 are described in the first and second embodiments.

As shown in fig. 6, the filter 106 is provided on the vibrating plate 203 so as to occupy the inside of the vent hole 30. The filter 106 is integrally fixed to the inner peripheral edge of the vibrating plate 203 in which the vent hole 30 is formed by welding or by an adhesive in a range occupying the entire vent hole 30.

The filter 106 can prevent dust, dirt, sand, and the like from entering the ventilation hole 30 from the outside of the housing 11, for example. The filter 106 has air permeability and water repellency, similar to the filter 6. The surface of the filter 106 is subjected to the same water repellent treatment as that of the filter 6. When the vibration plate 203 is in contact with water, the filter 106 plays a role of bouncing water off before the water enters the ventilation hole 30, or a role of forming water droplets to prevent the water from entering the ventilation hole 30. The filter 106 prevents the cross section in the vent hole 30 from being filled with water and from forming a water film, and allows air to enter and exit from the housing 11.

The operation and effect of the vehicle alarm device according to the third embodiment will be described. The alarm device for a vehicle according to the third embodiment includes a filter 106, and the filter 106 is provided on the vibrating plate so as to fill the vent hole 30 penetrating the vibrating plate 3 in the entire axial direction.

According to this vehicle alarm, since the filter 106 is configured to fill the vent hole 30 of the vibrating plate 203 in the entire axial direction, when water comes into contact with the vent hole 30 from the outside, the interior of the vent hole 30 can be prevented from being filled with water by the filter 106. Since the filter 106 does not allow water to easily enter the ventilation hole 30, the surface tension of water may be hard to act in the ventilation hole 30. This can prevent the formation of a water film in the vent hole 30. According to this vehicle alarm, since the formation of a water film in the vent hole 30 communicating the inside and outside of the housing 11 can be suppressed, the vent hole 30 and the filter 106 exhibiting desired air permeability can be provided. In addition, when the filter 106 has water repellency, the water is repelled by the filter 106, and therefore, the flow of the water that attempts to enter the vent hole 30 through the filter 106 can be further inhibited.

(other embodiments)

The inventive content of the present specification is not limited to the embodiments listed. The summary includes the embodiments listed and variations thereof based on them by those skilled in the art. For example, the present disclosure is not limited to the combinations of the components and elements disclosed in the embodiments, and can be implemented by various modifications. The inventive content can be implemented in various combinations. The inventive content may also have additional parts that can be added to the embodiments. The summary of the invention includes embodiments in which components and elements are omitted from the embodiments. The summary includes permutations and combinations of parts and elements between one embodiment and other embodiments. The technical scope of the disclosure is not limited to the description of the embodiments. The technical scope of the present disclosure is defined by the description of the claims, and all changes that come within the meaning and range of equivalency of the claims are to be embraced therein.

In the above embodiment, the first fixed part 212, the second fixed part, and the like of the bobbin 21 are fixed to the case 11 by rivets, but the number and the positions of the bobbin 21 fixed to the case 11 are not limited to these.

The vehicle alarm device that can achieve the object disclosed in the present specification may include a vibrating plate that is not limited to the longitudinal sectional shape of the vibrating plate 3 or 103 described in the above embodiment. For example, the vibrating plate provided in the vehicle alarm may have a longitudinal cross-sectional shape without a flat plate portion.

The vibrating plate provided in the vehicle alarm device that can achieve the object disclosed in the present specification is not limited to the number of flat plate portions and the number of intermediate bent portions described in the above embodiment. For example, the number of the flat plate portions may be 3 or more, or may be 1. For example, the number of the intermediate bent portions may be 2 or more, or may be 0.

Although the present invention has been described with reference to the embodiments, it is to be understood that the present invention is not limited to the above embodiments and structures. The present invention also includes various modifications and modifications within an equivalent range. In addition, while the various elements of the disclosure have been illustrated in various combinations and forms, other combinations or forms, including more, less or only a single element, are also within the scope and spirit of the invention.