WO2020119586A1 - Caisson d'extrêmes graves de portière de véhicule - Google Patents

Caisson d'extrêmes graves de portière de véhicule Download PDF

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Publication number
WO2020119586A1
WO2020119586A1 PCT/CN2019/123498 CN2019123498W WO2020119586A1 WO 2020119586 A1 WO2020119586 A1 WO 2020119586A1 CN 2019123498 W CN2019123498 W CN 2019123498W WO 2020119586 A1 WO2020119586 A1 WO 2020119586A1
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WO
WIPO (PCT)
Prior art keywords
woofer
box
passive
wall
rear box
Prior art date
Application number
PCT/CN2019/123498
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English (en)
Chinese (zh)
Inventor
郑晗
郑全录
宋军辉
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深圳纽斯声学系统有限公司
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Publication of WO2020119586A1 publication Critical patent/WO2020119586A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means

Definitions

  • the invention relates to a car audio system, specifically a car door subwoofer.
  • the automobile bass produced by the existing technology has the following four structures:
  • Integrated car subwoofer one or two 4-inch to 12-inch woofers are installed on a box made of plastic or wood with a volume of 20 to 40 liters; the disadvantage is that the volume is large and the car It is difficult to set up inside and high cost.
  • Body car subwoofer install a 6.5-inch to 8-inch ultra-thin woofer on a 10-liter to 15-liter box surrounded by steel plates on the car body; its disadvantage is that it takes up a lot of space in the car body. The production process is complicated and the cost is high.
  • Car trunk subwoofer in the trunk 1 to 3 8-inch to 12-inch ultra-thin woofers are installed on the rear window platform separated from the trunk in the compartment, and the volume of the trunk is about 500 liters to make the subwoofer
  • the disadvantage is that the volume of the trunk is about 500 liters.
  • the volume is too large to meet the requirements of the subwoofer; and the air leakage can not be sealed, which can only play the role of an acoustic baffle and high cost.
  • the object of the present invention is to provide a car door subwoofer.
  • the car subwoofer is small (only about 1.3 liters), and it can directly replace the traditional car door woofer.
  • the original door structure can be directly installed at the lower part of each door without any change.
  • the bass effect is better than that of four traditional car door 6.5-inch woofer speakers, and the cost is reduced by 75%.
  • the invention includes a front box body, a rear box body, a crooked neck throat pipe, an active woofer and a passive woofer, wherein the front box body and the rear box body are independent sealed boxes, between the front box body and the rear box body Through the communication of the crutch throat pipe, the conduction of the acoustic airflow is achieved.
  • the part where the crutch throat pipe communicates with the front box and the part where the crutch throat pipe communicates with the rear box are inclined, namely There is a turning part on the turning neck throat between the part where the turning neck throat communicates with the front box body and the part where the turning neck throat pipe communicates with the rear box body;
  • An active woofer is installed on the front wall of the front box;
  • a passive woofer is arranged in the rear box, and the passive woofer is arranged in one or in pairs, when the passive woofer is one , Installed on the front box wall or the rear box wall of the rear box, when the passive woofers are arranged in pairs, they correspond to the front and rear, one passive woofer in each pair is installed on the rear box On the box wall, the other passive woofer in each pair is installed on the box wall of the rear box or on the box wall of the front box;
  • the front box body extends outward toward a side of the rear box body to form a mounting hole edge, one end of the crooked neck throat communicates with the mounting hole edge, and the other end communicates with the rear box body;
  • the shape of the outer surface along the mounting hole is the same as the shape of the mounting steel plate hole of the car door woofer, and smaller than the mounting steel plate hole of the car door woofer;
  • the perimeter of the rear box is less than or equal to the perimeter of the front box, the outer edge of the rear box is coplanar with the outer edge of the front box, or protrudes from the outer edge of the front box;
  • the diaphragm area of the passive woofer is larger than the diaphragm area of the active woofer;
  • the installation plane of the passive woofer is parallel or coplanar with the installation plane of the active woofer;
  • the two passive woofers in each pair are installed with the same wall, that is, the two passive woofers in each pair are respectively installed on the front wall of the rear box And on the back wall;
  • the walls of the two passive woofers in each pair are the same, that is, one passive woofer in each pair is installed in the front box where the active woofer is located On the box wall of the body, another passive woofer in each pair is installed on the box wall of the rear box;
  • the present invention adopts the structural design of the front and rear boxes and the crooked neck throat.
  • the volume is only about 1.3 liters. It can easily replace the traditional car door woofer and be installed in the lower part of the car door, without the need to the original car door. Make any changes to the structure.
  • the invention utilizes the corresponding passive speaker resonance, the air spring effect of the acoustic airflow in the subwoofer box, the secondary bass boost of the door volume outside the box and the bass boost effect of the passenger's footrest, which can get perfect shocking heavy bass effect.
  • the present invention adopts the corresponding passive woofer settings.
  • the pair of passive woofer diaphragms have the opposite vibration direction, the vibration amplitude is equal, and the vibration force cancels, which greatly reduces the mechanical vibration of electroacoustic conversion and reduces the door. Vibration improves the life and reliability of the door.
  • the invention overcomes the shortcomings of the sharp drop of the bass effect of the traditional car subwoofer at a low volume, and achieves the reduction balance of the bass at a large volume and a small volume well.
  • the present invention uses 3.5-inch small-caliber speakers and uses only one car door subwoofer to obtain better sound quality than four 6.5-inch traditional car door woofer solutions, and the cost is reduced by 75%.
  • the present invention reduces the space occupied by the car woofer in the car and increases the available space in the car.
  • the invention reduces the installation components of the whole vehicle, and reduces the technical difficulty of the design and manufacture of the whole vehicle.
  • the present invention reduces bass sound delay and wind noise, and is more accurate and pure than traditional inverted car subwoofers.
  • the car door subwoofer of the present invention is an integrated plastic box structure, and the woofer speaker unit can obtain additional protection, extend the service life, and is more waterproof and not easily damaged.
  • the invention reduces the weight of the car speaker system by 70%, which will reduce the weight of the door and the weight of the whole car.
  • Embodiment 1A is a cross-sectional view of the structure of Embodiment 1 of the present invention.
  • FIG. 1B is a cross-sectional view of a three-dimensional structure of Embodiment 1 of the present invention.
  • Embodiment 2A is a structural cross-sectional view of Embodiment 2 of the present invention.
  • Embodiment 2B is a cross-sectional view of a three-dimensional structure of Embodiment 2 of the present invention.
  • Embodiment 3A is a structural cross-sectional view of Embodiment 3 of the present invention.
  • 3B is a cross-sectional view of a three-dimensional structure of Embodiment 3 of the present invention.
  • Embodiment 4A is a structural cross-sectional view of Embodiment 4 of the present invention.
  • Embodiment 4B is a cross-sectional view of a three-dimensional structure of Embodiment 4 of the present invention.
  • Embodiment 5A is a structural cross-sectional view of Embodiment 5 of the present invention.
  • Embodiment 5B is a cross-sectional view of a three-dimensional structure of Embodiment 5 of the present invention.
  • Embodiment 6A is a structural cross-sectional view of Embodiment 6 of the present invention.
  • FIG. 6B is a cross-sectional view of a three-dimensional structure of Embodiment 6 of the present invention.
  • 1 is the car door subwoofer
  • 2 is the front box
  • 3 is the rear box
  • 4 is the crooked neck throat
  • 5 is the active woofer
  • 6 is the passive woofer
  • 7 is the screw hole
  • 8 is the installation hole .
  • the invention includes a front box 2, a rear box 3, a crooked neck throat pipe 4, an active woofer 5 and a passive woofer 6, wherein the front box 2 and the rear box 3 are both independent sealed boxes.
  • the front box The body 2 and the rear box 3 communicate with each other through the crutch throat pipe 4 to realize the conduction of the acoustic airflow.
  • the communicating parts are inclined, that is, there is a bent part on the cranial throat tube 4 between the cranial throat tube 4 communicating with the front box 2 and the cranial throat tube 4 communicating with the rear box 2.
  • An active woofer 5 is placed in the front cabinet 2, and the active woofer 5 is installed on the front cabinet wall of the front cabinet 2.
  • the rear cabinet 3 is provided with a passive woofer 6, the passive woofer 5 is set in one or in pairs, and when the passive woofer 5 is one, it is installed on the front box wall or the rear box wall of the rear box 3 ;
  • the passive woofer 5 is set in pairs, it corresponds to the front and rear, one passive woofer 5 in each pair is installed on the wall of the rear cabinet 3, and the other passive woofer 5 in each pair is installed in The box wall of the rear box 3 or the box wall of the front box 2 is installed.
  • a plurality of screw holes 7 are evenly formed on the outer edge of the front box 2 in the circumferential direction for fixing the car door subwoofer on the car door.
  • the front box 2 extends outward toward the side of the rear box 3 to form a mounting hole edge 8.
  • One end of the crutch throat 4 communicates with the mounting hole edge 8, and the other end communicates with the rear box 3.
  • the shape of the outer surface of the mounting hole edge 8 is the same as the shape of the mounting steel plate hole of the car door woofer, and smaller than the mounting steel plate hole of the car door woofer.
  • the circumference of the rear case 3 is less than or equal to the circumference of the front case 2.
  • the outer edge of the rear case 3 is coplanar with the outer edge of the front case 2 or protrudes beyond the outer edge of the front case 2.
  • the installation plane of the passive woofer 6 is parallel or coplanar with the installation plane of the active woofer 5.
  • the diaphragm area sum of the passive woofer 6 is larger than that of the active woofer 5.
  • the active woofer 5 of the present invention When the active woofer 5 of the present invention is 3.5 inches, the sum of the volumes of the front box 2, the rear box 3 and the crooked throat 4 is about 1.3 liters, which is proportional to the diaphragm area of the active woofer 5. Because the installation structure of the car door woofer is a traditional 6.5-inch woofer, it is tailor-made. Although the 1.3-liter volume subwoofer of the present invention is already very small, it is still difficult to install it on the vehicle door without changing the structure.
  • the box body of the automobile door subwoofer 1 of the present invention is divided into a front box body 2 and a rear box body 3, and they realize the sound air flow through the crooked neck throat pipe 4; the whole of the present invention is in the shape of a letter "h", front Box 2 is located on the outside of the door woofer mounting steel plate, and rear box 3 is located on the inner side of the door woofer mounting steel plate, so that the car door subwoofer can be designed very flexibly according to the different door structures of different models.
  • this embodiment directly replaces the existing 6.5-inch woofer on the right front door of an original car with an "h" shaped car door subwoofer.
  • the front box 2 of the car door subwoofer of this embodiment is a cylindrical box, and the rear box wall extends outward to form a cylindrical mounting hole edge 8, the outer diameter of the mounting hole edge 8 is smaller than that of the original car woofer installation
  • the hole diameter of the steel plate, the hole diameter is about 145mm.
  • the diameter and height of the front box 2 should be such that they do not interfere with the trim panel in the door of the car.
  • the diameter of the front case 2 is ⁇ 165 mm
  • the diameter of the mounting hole edge 8 is ⁇ 130 mm.
  • the active woofer 5 is disposed on the front wall of the front cabinet 2.
  • the active woofer 5 may be round or oval. In this embodiment, a 3.5-inch circular cone woofer is used.
  • the rear box 3 should be prevented from interfering with the window lift glass. On the one hand, the volume of the box should be obtained, and on the other hand, it will not interfere with the window lift glass. When all the glass falls, keep a distance of 8mm or more.
  • the outer shape of the rear box 3 in this embodiment is partially cylindrical, and its radius is less than or equal to the radius of the front box 2.
  • the crooked neck throat tube 4 is a transparent tube used to connect the front cabinet 2 and the rear cabinet 3; this way, on the one hand, the volume is fully increased, and on the other hand, the strength of the entire subwoofer cabinet is ensured.
  • the cross-sectional area of the crutch throat tube 4 is greater than 1000 mm 2. This embodiment is a half-moon-shaped tube.
  • the end of the crutch throat tube 4 in this embodiment communicating with the front box 2 is a straight tube, which is connected to the rear box 3
  • the axial cross-section of the other end of the communication is a bevel; the cross-sectional area of the crutch throat pipe 4 of this embodiment is 5000 mm 2 .
  • the sum of the volume of the front cabinet 2, the rear cabinet 3 and the crutch throat pipe 4 of this embodiment is 1.3 liters.
  • the corresponding cabinet volume is about 1.3 liters, which is better than 1.3 It is difficult to install in the car door, and the bass effect less than 1.3 liters starts to deteriorate.
  • the passive woofer 6 may be one or a pair.
  • Passive woofer is also called bass radiator, it can be round, oval or rectangular, the shape can be flat or conical.
  • the passive woofer 6 has a diaphragm area 1.5 times larger than the active woofer 5 diaphragm area.
  • the passive woofer 6 is installed on the wall of the front cabinet 2 or the rear cabinet 3, and the installation plane of the passive woofer 6 and the active bass The installation planes of the speakers 5 are coplanar or parallel.
  • This embodiment uses a pair of circular flat passive woofers with a diameter of ⁇ 88mm, which are installed on the front and rear walls of the rear cabinet 3 one after the other, and the pair of passive woofer 6 installation plane and active The installation plane of the woofer 5 is parallel.
  • the outer edge of the rear case 3 is coplanar with the outer edge of the front case 2.
  • screw holes 7 are evenly arranged on the outer edge of the front box 2 in the circumferential direction.
  • the opening positions of the screw holes 7 are the same as the positions where the original car door woofer is installed on the door steel plate, and the fixing screws used are also the same .
  • the car door subwoofer 1 can be made of plastic, metal, etc. In this embodiment, it is made by open mold injection. First design the appearance and structure according to the original car door structure and the design principles described in this example; then make the box mold, the box is made of ABS and other materials by injection molding, and then install the active woofer 5 and passive woofer 6 in Corresponding to the front box 2 and the rear box 3. Then install the completed car door subwoofer 1 to the front passenger door. Of course, it can also be installed in the lower part of the front driving door or the lower part of the rear left and right doors. The whole car can be installed not only one, but also two (such as the lower part of the front and front passenger doors) or four (one for each of the four doors), so that the bass effect will be better.
  • the difference between this embodiment and the first embodiment is that a pair of passive woofer 6 of this embodiment, one of which is installed on the wall of the rear box 3 and the other On the front box wall of the front box body 2 and coplanar with the mounting plane of the active woofer 5. Therefore, the inner diameter of the end of the crutch throat tube 4 communicating with the front box 2 of this embodiment is larger than that of the first embodiment; furthermore, the shaft of the other end of the crutch throat tube 4 communicating with the rear box 3 of this embodiment
  • the cross-section is an inwardly concave arc. The rest are the same as in the first embodiment.
  • this embodiment differs from the first embodiment in that a pair of passive woofer 6 of this embodiment, one of which is installed on the front wall of the rear cabinet 3, and the other On the front box wall of the front box body 2 and coplanar with the mounting plane of the active woofer 5. The rest are the same as in the first embodiment.
  • the difference between this embodiment and the first embodiment is that the length of the crutch throat tube 4 of this embodiment is greater than the length of the crutch throat tube 4 of the first embodiment, and it communicates with the front box 2
  • One end is a straight pipe
  • the other end communicating with the rear case 3 is a curved pipe
  • the lines are perpendicular.
  • the outer edge of the rear box 3 of this embodiment protrudes from the outer edge of the front box 2, so that it can be more conveniently and flexibly designed under the already-constrained door structure to adapt to the installation environment of different door woofer speakers.
  • the rest are the same as in the first embodiment.
  • the passive woofer 6 in this embodiment is one, which is a circular flat passive woofer with a diameter of 120 mm, and this passive The woofer is installed on the front box wall of the rear box 3.
  • the inner diameter of the end of the crutch throat pipe 4 of this embodiment communicating with the front box 2 may be the same as that of the first embodiment.
  • the rest are the same as in the second embodiment.
  • the passive woofer 6 in this embodiment is one, which is a circular flat passive woofer with a diameter of ⁇ 120 mm, and this passive The woofer is installed on the front box wall of the rear box 3. The rest are the same as in the fourth embodiment.
  • the working principle of the present invention is:
  • the active woofer diaphragm vibrates to produce bass sound, which performs electroacoustic conversion.
  • the diaphragm of the active woofer 5 vibrates in the direction of the front box 2, the air in the front box 2 is compressed, making the air pressure in the front box 2 stronger than that of the neck throat 4 and the rear box 3 With the pressure, the air in the front box 2 will flow into the rear box 3 through the crutch throat 4.
  • the pressure of the front and rear cabinets 2 and 3 is stronger than the air pressure of the listening environment, causing the diaphragm of the passive woofer 6 to vibrate toward the outside of the respective cabinet; when the diaphragm of the active woofer 5 is forward of the cabinet 2
  • the pressure in the front box 2 is reduced, and the air in the rear box 2 flows through the neck throat 4 to the front box 2.
  • This flow produces the effect of an air acoustic spring, and the area of both the active diaphragm and the passive diaphragm is doubled, which greatly enhances the bass sound wave.
  • This bass sound wave is not directly radiated into the listening space, but firstly propagates into the cabin door, which further enhances the bass sound wave in the cabin door, and then propagates to the passenger's foot warehouse. It has been improved.
  • the door subwoofer with a 1.3-liter cabinet volume of 3.5-inch woofer has a thick, pure and powerful bass.
  • the unique design of the front box, rear box, double box and crooked throat of the 1.3-liter small box makes it easy to directly replace the original car without any changes to the original car door structure.
  • the car door has a 6.5-inch woofer, and the bass effect of such a car door subwoofer is better than that of four traditional car door 6.5-inch woofers, and the cost is reduced by 75%. In the case of a significant cost reduction, the car's bass is more good.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Mechanical Engineering (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

La présente invention concerne des systèmes audio de véhicule, en particulier un caisson d'extrêmes graves de portière de véhicule, dont les boîtiers avant et arrière sont des boîtiers étanches discrets, le boîtier avant et le boîtier arrière sont en communication l'un avec l'autre par l'intermédiaire d'un tuyau en forme de col-de-cygne à col incurvé afin de mettre en oeuvre la conduction de flux d'air acoustique, et, la partie du tuyau en forme de col-de-cygne à col incurvé en communication avec le boîtier avant et la partie du tuyau en forme de col-de-cygne à col incurvé en communication avec le boîtier arrière sont inclinées l'une par rapport à l'autre. Un haut-parleur de graves actif est monté sur une paroi de boîtier avant du boîtier avant. Un haut-parleur de graves passif est logé à l'intérieur du boîtier arrière. Le haut-parleur de graves passif est fourni soit de manière discrète soit sous la forme d'une paire. Lorsque le haut-parleur de graves passif est discret, celui-ci est monté sur une paroi de boîtier avant ou une paroi de boîtier arrière du boîtier arrière. Lorsque le haut-parleur de graves passif est apparié, la paire correspond à l'avant-arrière, l'un dans la paire étant montée sur la paroi de boîtier du boîtier arrière, et l'autre est monté sur la paroi de boîtier du boîtier arrière ou monté sur la paroi de boîtier du boîtier avant. La présente invention réduit de manière significative l'encombrement du caisson d'extrêmes graves, permettant ainsi un remplacement facile et direct d'un haut-parleur de graves de 6,5 puces de portière de véhicule d'origine sans modification de la structure d'origine d'une portière de véhicule.
PCT/CN2019/123498 2018-12-14 2019-12-06 Caisson d'extrêmes graves de portière de véhicule WO2020119586A1 (fr)

Applications Claiming Priority (2)

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CN201811529963.5A CN111327992A (zh) 2018-12-14 2018-12-14 一种汽车门低音炮
CN201811529963.5 2018-12-14

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WO2020119586A1 true WO2020119586A1 (fr) 2020-06-18

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CN1051654A (zh) * 1990-11-27 1991-05-22 樊兆伟 水晶音箱及其制造方法
US20040141625A1 (en) * 2002-09-27 2004-07-22 Kurt Leipold Sound system for a vehicle
CN106034270A (zh) * 2015-03-19 2016-10-19 深圳纽斯声学系统有限公司 一种封闭式多腔体低音箱及内置该低音箱的电视机
CN209120474U (zh) * 2018-12-14 2019-07-16 深圳纽斯声学系统有限公司 基于车门低音炮的汽车音响系统
CN209120453U (zh) * 2018-12-14 2019-07-16 深圳纽斯声学系统有限公司 汽车门低音炮

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