JP2017039452A - Loudspeaker system for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve flexibility in shape of a main duct while reducing the number of manufacturing steps and a manufacturing cost.SOLUTION: A main duct 13 is formed by jointing a first half split body 13a having a concave cross section being opened in one direction to a second half split body 13b having a concave cross section being opened in the other direction, with each open side being faced each other, and a first through hole 19 and a second through hole are formed at the first half split body 13a. A first sub duct 25 is formed in tube, being protruded integrally with a peripheral edge part of the first through hole 19 of the first half split body 13a. Further, a second sub duct 35 is formed in tube, being protruded integrally with a peripheral edge part of the second through hole of the first half split body 13a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle speaker system including an instrument panel and an acoustic device having a tubular main duct extending in the vehicle width direction inside the instrument panel.

  Patent Document 1 discloses a vehicle speaker system including an instrument panel and an acoustic device having a tubular main duct extending in the vehicle width direction inside the instrument panel. In this vehicle speaker system, the instrument panel has a first sound outlet and a second sound outlet, while the main duct has a first through hole and a second through hole inside the main duct. A through-hole is formed so as to communicate with a common communication space. A first sub duct projects from the peripheral edge of the first through-hole toward the outer peripheral side so as to communicate the inner space with the first sound outlet of the instrument panel. The speaker is disposed with the front side facing outward. On the other hand, a second sub duct is integrally extended at the peripheral edge of the second through hole so as to communicate the internal space with the second sound outlet of the instrument panel. Then, pipe resonance occurs in the communication space of the main duct and the internal space of the second sub duct, and bass is generated from the second sub duct.

JP 2005-96630 A

  By the way, in the vehicle speaker system as in Patent Document 1, it is conceivable that the main duct is made of a single metal, but in this case, the main duct usually has a flat steel strip and a plurality of rolls. Therefore, it is difficult to form a deformed portion such as a bulging portion in the midway portion in the longitudinal direction of the main duct, and the degree of freedom in shape is limited.

  In addition, since it is necessary to separately form the base end portion of the first sub duct and the base end portion of the second sub duct and attach them to the main duct, the manufacturing man-hour and the manufacturing cost are increased.

  This invention is made | formed in view of this point, The place made into the objective is to reduce the manufacturing man-hour and manufacturing cost while improving the freedom degree of the shape of a main duct.

  In order to achieve the above object, the present invention is characterized in that a main duct is formed by joining two halves having a concave cross section.

  Specifically, the present invention includes an instrument panel and an acoustic device having a tubular main duct extending in the vehicle width direction inside the instrument panel. The instrument panel includes a first sound outlet and A second sound emission port is formed, and the main duct is formed with a first through hole and a second through hole so as to communicate with a common communication space inside the main duct, and a peripheral edge of the first through hole. The first sub-duct protrudes toward the outer peripheral side so that the internal space communicates with the first sound emission port of the instrument panel, and a speaker is located on the front side of the first sub-duct. The outer periphery of the second through hole is disposed on the outer periphery of the second through hole so that the second sub duct communicates with the second sound emission port of the instrument panel. Intended for protruding from a speaker system for a vehicle towards and taken solutions as follows.

  That is, according to the first aspect of the present invention, the main duct is configured such that a first half body having a concave cross section that opens in one direction and a second half half body having a concave cross section that opens in the other direction are opposed to each other. The first through hole and the second through hole are formed in the first half body, and at least a base end portion of the first sub duct is formed in a cylindrical shape. The second half-duct is formed integrally with the peripheral edge of the first through hole of the first half body, and at least the base end of the second sub-duct is formed in a cylindrical shape, and the second through hole of the first half body It is characterized by projecting integrally with the peripheral edge of the.

  According to a second aspect of the present invention, in the vehicle speaker system according to the first aspect of the present invention, a partition portion that partitions the internal space of the main duct into a pair of divided spaces in the middle in the longitudinal direction is provided on the inner surface of the first half body. The first through hole and the second through hole are formed as a single unit, and the pair of divided spaces are formed in pairs so as to constitute the communication space.

  According to a third aspect of the present invention, in the vehicular speaker system according to the first or second aspect of the present invention, a tubular space that is continuous with the second sub-duct is formed at the peripheral portion of the second through hole of the first half body. The projecting wall portion is provided so as to project inward.

  According to a fourth aspect of the present invention, in the vehicle speaker system according to any one of the first to third aspects, the second half body is made of a material having rigidity higher than that of the first half body. Steering shaft support brackets for supporting the steering shaft are attached to the middle part in the longitudinal direction of the split body, and car body mounting brackets connected to the side panels on both sides of the car body are attached to both ends in the longitudinal direction of the second half part. It is attached.

  According to the first invention, since the first half and the second half can be formed by the mold, it becomes easy to form a deformed portion such as a bulging portion in the longitudinal middle portion of the main duct. The degree of freedom of the duct shape is improved.

  Further, the base end portion of the first sub duct and the base end portion of the second sub duct can be formed integrally with the first half body, and the base end portion of the first sub duct and the base end portion of the second sub duct are separately formed. This eliminates the need for attaching to the main duct, thereby reducing the number of manufacturing steps and manufacturing costs.

  According to the second invention, since the partition portion is formed integrally with the first half body and the partition member as a separate member does not have to be attached to the main duct, the number of parts and the number of manufacturing steps can be reduced.

  According to the third aspect of the invention, the continuous tubular space can be lengthened and the Helmholtz resonance frequency can be lowered without increasing the protruding height of the second sub-duct, so that the sound reproduction capability can be reduced without increasing the size of the acoustic device. It can be improved.

  According to the fourth invention, the main duct serves as a reinforcing member for supporting the steering shaft, and it is not necessary to separately provide a reinforcing member for supporting the steering shaft, so that space saving can be realized, and the weight and the number of parts can be realized. Can be reduced.

  In addition, since the force applied to the second halved body from the steering shaft support bracket is distributed to the vehicle body via the vehicle body mounting bracket and is not easily transmitted to the first halved body, the first half body is made of an inexpensive material with low rigidity. Can be configured.

1 is a perspective view showing a vehicle speaker system according to an embodiment of the present invention. It is a disassembled perspective view of an audio equipment. It is sectional drawing corresponding to the III-III line of FIG. It is sectional drawing corresponding to the IV-IV line of FIG. It is sectional drawing corresponding to the VV line | wire of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show a vehicle speaker system 1 according to an embodiment of the present invention provided on the front side of a passenger compartment of a right-hand drive specification vehicle. The vehicle speaker system 1 includes an instrument panel 3 and an acoustic device 5 disposed inside the instrument panel 3.

  The instrument panel 3 includes an instrument panel main body 7 that forms the main body. The instrument panel body 7 is formed in a substantially L-shaped cross section by an upper panel portion 7a extending substantially horizontally in the vehicle width direction and a lower panel portion 7b extending downward from the entire rear end width of the upper panel portion 7a. A console portion 7c that bulges rearward of the vehicle body is formed at the vehicle width direction central portion of the lower panel portion 7b.

  In the vicinity of both ends in the vehicle width direction of the upper panel portion 7a of the instrument panel body 7, circular first sound emission ports 9 are formed. Further, a second sound emission port 11 having a long hole shape extending in the vehicle width direction is formed through the central portion of the upper panel portion 7a in the vehicle width direction. The first sound emission opening 9 and the second sound emission opening 11 are covered from above by a speaker grill (not shown).

  The acoustic device 5 includes a main duct 13 having an elliptical cross section that is long in the vertical direction and extends in the vehicle width direction inside the instrument panel 3. The main duct 13 opens downward (in one direction) and has a substantially U-shaped cross section and extends in the vehicle width direction, and opens upward (in the other direction) and has a substantially U-shaped cross section. And a second half 13b extending in the vehicle width direction. The first half 13a is made of a resin such as polypropylene or ABS (acrylonitrile / butadiene / styrene), and the second half 13b is more rigid than the resin constituting the first half 13a. It is a press-formed product made of a metal as a material. The length of the second half 13b in the longitudinal direction is set shorter than that of the first half 13a.

  A plate-like first projecting portion 14 is integrally formed over the entire length in the longitudinal direction (vehicle width direction) at both open side edges of the first half 13a. The first projecting portion 14 has five plate-like first projecting portions 15 having screw holes projecting integrally in the projecting direction of the first projecting portion 14 with an interval in the vehicle width direction. It is installed. In addition, on the inner surface of the central portion in the longitudinal direction of the first halved body 13a, a plate-like partitioning portion 16 having an elliptical shape in plan view over the entire circumferential direction is downward (open) with the plate surface facing the longitudinal direction. Side). In addition, at both ends in the longitudinal direction of the first halved body 13a, a plate-like blocking portion 17 having an elliptical shape in a plan view over the entire circumferential direction is downward (open side) with the plate surface directed in the longitudinal direction. Projected integrally toward

Further, a first through hole 19 is formed through the center portion of the first half 13a in the longitudinal direction of the vehicle body in the vicinity of both ends in the longitudinal direction. At the peripheral edge of the first through hole 19, a cylindrical first sub-duct 25 extends upward (outer peripheral side), that is, the first inner space so that the inner space communicates with the first sound emission port 9 of the instrument panel 3. The halves 13a are integrally projected toward the non-opening side. The front end portion of the first sub duct 25 is integrated with the four attachment pieces 26 toward the inner peripheral side so as to form a screw hole that opens to the protruding side between the inner peripheral surface of the first sub duct 25. Projected to Further, a frame portion 27 is directed toward the inner peripheral side at the tip end portion of the first sub-duct 25 over the entire circumference except for the location where the mounting piece 26 is formed and the location where the wiring 34 of the speaker 31 described later is drawn out. Projected as a single unit. Inside the first sub duct 25, a speaker 31 is disposed with its front side facing outward. A flange portion 31a is integrally formed at the front end portion of the speaker 31 so as to project to the outer peripheral side of the first sub duct 25. The flange portion 31a, the tip end portion of the first sub duct 25, and the attachment piece portion 26 are provided. Fastened with four screws 33. In FIG. 4, a cross section around the wiring 34 connected to the speaker 31 is shown on the left side of the speaker 31. Effective diaphragm area of the speaker 31 ^is set to 38cm ² ~79cm 2.

  A pair of second through-holes 21 sandwiches the projecting portion of the partition 16 from both sides in the longitudinal direction at a location lower than the upper end at the longitudinal center of the first half 13a. It is formed through. At the peripheral edge of each second through-hole 21, a cylindrical second sub-duct 35 is integrally protruded upward (on the outer peripheral side), that is, toward the opposite side of the first half 13 a. A protruding wall portion 36 that forms a tubular space SP continuous with the second sub-duct 35 is integrally protruded inward. The internal space of the second sub duct 35 communicates with the second sound outlet 11 of the instrument panel 3. The first half 13a, the partitioning portion 16, the closing portion 17, the first sub duct 25, the second sub duct 35, and the protruding wall portion 36 are integrally formed.

  A plate-like second projecting portion 37 is integrally formed over the entire length in the longitudinal direction (vehicle width direction) at both ends of the open side of the second half 13b. On the second projecting portion 37, five plate-like second projecting portions 38 having screw holes are integrally projected toward the projecting direction of the second projecting portion 37 with an interval in the vehicle width direction. It is installed.

  The first half 13a and the second half 13b are opposed to each other on the open side, and the first overhanging portion 14 of the first half 13a and the second half 13b The main duct 13 is formed by joining the two overhang portions 37 and the second halved body over the entire circumference with a sealing material such as foam tape or silicon (not shown) interposed therebetween. The first protrusion 15 of the first half 13 a and the second protrusion 38 of the second half 13 b are fastened by screws 53. Furthermore, the front end surface of the partitioning portion 16 and the front end surface of the closing portion 17 are joined to the inner surface of the second half 13b with a sealing material (not shown) such as foam tape or silicon interposed therebetween. ing.

  In this state, the internal space of the main duct 13 is closed from both sides in the vehicle width direction by the closing portion 17 and is divided by the partitioning portion 16 as a pair of left and right communication spaces in the middle (midway) portion in the longitudinal direction. It is partitioned into spaces S1 and S2. Therefore, the volumes of the divided spaces S1 and S2 are equal to each other. The total of the volume of the left divided space S1 and the volume of the first sub duct 25 communicating with the divided space S1 is set to 3L to 6L. Similarly, the total of the volume of the right divided space S2 and the volume of the first sub duct 25 communicating with the divided space S2 is also set to 3L to 6L. The left first through hole 19 and the second through hole 21 communicate with the left divided space S1, and the right first through hole 19 and the second through hole 21 communicate with the right divided space S2. Yes. That is, the first through hole 19 and the second through hole 21 are formed in pairs corresponding to the divided spaces S1 and S2.

The area of the cross section perpendicular to the longitudinal direction of the internal space of each second sub-duct 35 (the cross-section perpendicular to the longitudinal direction of the annular space SP) is equal to the divided space S 1 of the main duct 13 communicating with the second sub-duct 35. It is set to be smaller than the area of the cross section perpendicular to the longitudinal direction of S2 and 20% to 50% of the effective diaphragm area of the speaker 31. The length l (cm) of each annular space SP is set so that the Helmholtz frequency is a predetermined frequency f selected by the user from 30 Hz to 70 Hz. That is, the area of the cross section perpendicular to the longitudinal direction of the internal space of the second sub duct 35 is S (cm ² ), the radius of the cross section perpendicular to the longitudinal direction of the internal space of the second sub duct 35 is r (cm), 2 The sum of the volume of the divided spaces S1, S2 of the main duct 13 communicating with the sub-duct 35 and the volume of the first sub-duct 25 communicating with the divided spaces S1, S2 is V (cm ³ ), and the speed of sound is c (cm / cm s), the length l (cm) of each annular space SP is set so as to satisfy the following expression. Here, the volume of the divided spaces S1, S2 of the main duct 13 is the volume of the space excluding the portion occupied by the protruding wall portion 36 and the annular space SP, and the volume of the first sub-duct 25 is the portion occupied by the speaker 31. The volume of the excluded space.

  The area of the cross section perpendicular to the longitudinal direction of the internal space of the second sub-duct 35 is set to 20% to 50% of the effective diaphragm area of the speaker 31. This is because the output sound becomes weak and the low-pitched sound reproduction capability is not sufficiently secured, while if it exceeds 50%, the leakage of medium and high sounds from the second sub duct 35 becomes large.

  In addition, the Helmholtz frequency is set to 30 Hz to 70 Hz. If the frequency is less than 30 Hz, the sound of less than 30 Hz outside the human audible range is intensified, and the bass reproduction ability cannot be effectively improved, but exceeds 70 Hz. This is because a sound exceeding 70 Hz that a person does not recognize as a low tone is strengthened and the bass reproduction ability cannot be effectively improved.

  A steering shaft support bracket 43 that supports a steering shaft (not shown) is attached to the outer peripheral surface of the second half 13b on the right side (longitudinal direction in the longitudinal direction) from the longitudinal center.

  In addition, plate-like vehicle body mounting brackets 47 are attached to both ends in the longitudinal direction of the second half 13b by welding from the outside in the vehicle width direction with the plate surfaces facing the vehicle width direction. It is connected to the side panels on both sides of the vehicle body by fastening. That is, the second half 13 b is attached to the vehicle body via the vehicle body mounting bracket 47.

  A support bracket 49 is attached to the outer peripheral surface of the second halved body 13b slightly to the right (longitudinal direction in the longitudinal direction) by welding so as to support the main duct 13 from below. 49 is fastened to the floor panel of the vehicle body and the console portion 7 c of the instrument panel body 7.

  Further, a plurality of instrument panel mounting brackets 51 are attached to the outer peripheral surfaces of the first half 13a and the second half 13b by welding or the like, and these instrument panel mounting brackets 51 are attached to the instrument panel body 7 from the back side. It is concluded.

  In FIG. 3, the instrument panel mounting bracket 51 is not shown.

  Therefore, according to the present embodiment, since the first half 13a and the second half 13b can be molded by a mold, a deformed portion such as a bulging portion is formed in the midway portion of the main duct 13 in the longitudinal direction. It becomes easy and the freedom degree of the shape of the main duct 13 improves.

  Further, the first sub-duct 25 and the second sub-duct 35 can be formed integrally with the first half 13a, so that it is not necessary to separately form the first sub-duct 25 and the second sub-duct 35 and attach them to the main duct 13. Therefore, manufacturing man-hours and manufacturing costs can be reduced.

  Moreover, since the partition part 16 is integrally formed in the 1st half body 13a, and the partition member as another member does not need to be attached to the main duct 13, the number of parts and a manufacturing man-hour can be reduced.

  Furthermore, since the closing portion 17 is also formed integrally with the first half 13a and a closing member as a separate member does not have to be attached to the main duct 13, the number of parts and the number of manufacturing steps can be reduced.

  In addition, since the protruding wall portion 36 protrudes inside the first half 13a, the continuous tubular space SP can be lengthened and the Helmholtz resonance frequency can be lowered without increasing the protruding height of the second sub-duct 35. . Therefore, the bass reproduction capability can be improved without increasing the size of the acoustic device 5.

  Further, since the internal space of the second sub duct 35 is narrower than the corresponding divided spaces S1 and S2 of the main duct 13, the Helmholtz resonance frequency can be lowered as compared with the case where the thicknesses of both are made equal. Therefore, the bass reproduction capability can be improved without increasing the size and weight of the acoustic device 5.

  Further, since the low sound can be output from the second sub-duct 35 regardless of the diameter of the speaker 31, cost and weight can be reduced by downsizing the speaker 31.

  Moreover, since the speaker 31 is arrange | positioned inside the instrument panel 3 and the waterproof cover which covers the speaker 31 is unnecessary, cost and weight can be reduced.

  Further, since the area of the cross section perpendicular to the longitudinal direction of the internal space of the second sub-duct 35 is 20% or more of the effective diaphragm area of the speaker 31, the sound output from the second sub-duct 35 is strengthened and the bass sound is reduced. Reproduction ability is improved. Further, since the area of the cross section perpendicular to the longitudinal direction of the internal space of the second sub duct 35 is 50% or less of the effective diaphragm area of the speaker 31, leakage of medium and high sounds from the second sub duct 35 is prevented. .

  Further, the main duct 13 serves as a reinforcing member for supporting the steering shaft, and it is not necessary to separately provide a reinforcing member for supporting the steering shaft, so that space can be saved and the weight and the number of parts can be reduced.

  Further, since the force applied to the second half 13b from the steering shaft support bracket 43 is distributed to the vehicle body via the vehicle body mounting bracket 47 and the support bracket 49 and is not easily transmitted to the first half 13a, the first half The body 13a can be made of an inexpensive material with low rigidity.

  Furthermore, since the Helmholtz resonance frequency is 30 Hz to 70 Hz and the sound of 30 Hz to 70 Hz that humans recognize as a low tone is strengthened, the bass reproduction capability can be effectively improved.

  In the above-described embodiment, the entire first sub duct 25 is formed in a cylindrical shape and integrally protrudes from the first half 13a. However, a separate member constituting the tip of the first sub duct 25 is provided, Only the base end portion of the sub duct 25 may be formed in a cylindrical shape and protruded integrally with the first half 13a. Similarly, the second sub-duct 35 may also be provided with another member constituting its distal end, and only the base end thereof may be formed in a cylindrical shape so as to project integrally with the first half 13a.

  Moreover, in the said embodiment, although the said 1st half-divided body 13a was comprised with resin, reinforcement | strengthening materials, such as what mixed the adhesive agent with the crushed piece of wood, and carried out heat compression molding, or glass fiber, carbon fiber, etc. are mixed. You may comprise by fiber reinforced resin, such as the made polypropylene.

  Moreover, in the said embodiment, although the said 2nd half-divided body 13b was comprised with the metal, you may comprise with resin etc. to which rigidity was improved with reinforcement materials, such as carbon fiber.

  Moreover, in the said embodiment, although the said 1st half body 13a and the 2nd half body 13b were made into cross-sectional substantially U shape, as long as cross-sectional concave shape, it is good also as other shapes, such as cross-sectional substantially U-shape.

  The present invention is useful as a vehicular speaker system including an instrument panel and an acoustic device having a tubular main duct extending in the vehicle width direction inside the instrument panel.

1 Vehicle speaker system
3 Instrument panel
5 sound equipment
9 First sound outlet
11 Second sound outlet
13 Main duct
13a First half
13b Second half
16 Partition
19 First through hole
21 Second through hole
25 First sub-duct
31 Speaker
35 Second sub-duct
36 Protruding wall
43 Steering shaft support bracket 47 Car body mounting bracket S1, S2 Divided space (communication space)
SP tubular space

Claims (4)

An instrument panel (3) and an acoustic device (5) having a tubular main duct (13) extending in the vehicle width direction inside the instrument panel (3),
The instrument panel (3) has a first sound outlet (9) and a second sound outlet (11),
A first through hole (19) and a second through hole (21) are formed through the main duct (13) so as to communicate with a common communication space (S1, S2) inside the main duct (13). The first sub-duct (25) is disposed on the outer peripheral side of the first through hole (19) so that the inner space communicates with the first sound outlet (9) of the instrument panel (3). A speaker (31) is disposed inside the first sub-duct (25) with the front side facing outward, and at the periphery of the second through hole (21). A speaker system for a vehicle in which the second sub-duct (35) protrudes toward the outer peripheral side so as to communicate its internal space with the second sound outlet (11) of the instrument panel (3),
The main duct (13) has a first half (13a) having a concave cross section that opens in one direction and a second half (13b) that has a concave cross section that opens in the other direction. And the first through hole (19) and the second through hole (21) are formed in the first half (13a),
At least a base end portion of the first sub duct (25) is formed in a cylindrical shape, and integrally protrudes from a peripheral portion of the first through hole (19) of the first half body (13a).
At least the base end portion of the second sub-duct (35) is formed in a cylindrical shape, and protrudes integrally with the peripheral portion of the second through hole (21) of the first half body (13a). A vehicle speaker system characterized by the above. The vehicle speaker system according to claim 1,
A partition part (16) that partitions the internal space of the main duct (13) into a pair of divided spaces (S1, S2) in the middle in the longitudinal direction integrally projects on the inner surface of the first half (13a). Established,
The first through hole (19) and the second through hole (21) are formed in pairs such that the pair of divided spaces (S1, S2) constitute the communication spaces (S1, S2), respectively. A vehicle speaker system characterized by comprising: The vehicle speaker system according to claim 1 or 2,
At the periphery of the second through hole (21) of the first halved body (13a) is a protruding wall portion (36) that forms a tubular space (SP) continuous with the second sub duct (35). The speaker system for vehicles characterized by projecting toward the vehicle. The vehicle speaker system according to any one of claims 1 to 3,
The second half (13b) is made of a material having higher rigidity than the first half (13a).
A steering shaft support bracket (43) for supporting the steering shaft is attached to a middle portion in the longitudinal direction of the second halved body (13b).
A vehicle speaker system, characterized in that vehicle body mounting brackets (47) connected to side panels on both sides of the vehicle body are attached to both ends in the longitudinal direction of the second halved body (13b).

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