CN113212311A - Automobile external rearview mirror and noise reduction method thereof - Google Patents
Automobile external rearview mirror and noise reduction method thereof Download PDFInfo
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- CN113212311A CN113212311A CN202110582757.6A CN202110582757A CN113212311A CN 113212311 A CN113212311 A CN 113212311A CN 202110582757 A CN202110582757 A CN 202110582757A CN 113212311 A CN113212311 A CN 113212311A
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- 238000002474 experimental method Methods 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/02—Rear-view mirror arrangements
- B60R1/06—Rear-view mirror arrangements mounted on vehicle exterior
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D35/00—Vehicle bodies characterised by streamlining
- B62D35/008—Side spoilers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D37/00—Stabilising vehicle bodies without controlling suspension arrangements
- B62D37/02—Stabilising vehicle bodies without controlling suspension arrangements by aerodynamic means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/82—Elements for improving aerodynamics
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- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Multimedia (AREA)
- Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
Abstract
The invention discloses an automobile outside rear-view mirror and a noise reduction method thereof, the automobile outside rear-view mirror comprises a plurality of fins which are arranged in a direction vertical to the moving direction of an automobile, when noise reduction is needed, the fins rotate and extend out of a rear-view mirror shell, and an inclined comb tooth structure similar to the outer edge of primary flying feathers of birds is formed above a lens, so that large air vortexes flowing through the surface of the outside rear-view mirror are filtered into small finely-broken vortexes, and the generation of turbulent noise is inhibited; the fins are rotated and moved through the rotating unit and the moving unit, so that the fins extend out of the rearview mirror shell when a noise reduction scene is needed, and the fins retract into the rearview mirror shell when the noise reduction scene is not needed, so that the appearance smoothness of the outer rearview mirror is kept; when the automobile outside rearview mirror implements noise reduction work, the driving speed is set as a switch for starting and ending the noise reduction work scene; the whole process is automatically finished without manual operation, and the driving habit of a driver is not influenced.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to an automobile outside rearview mirror and a noise reduction method thereof.
Background
With the increase of the moving speed of the automobile, the proportion of the external aerodynamic wind noise is gradually increased, and the external aerodynamic wind noise becomes a main factor influencing the noise of the passenger compartment during high-speed running. The main source of the external aerodynamic wind noise of the passenger car is generated by the action of wake vortex flow and front windshield glass caused by the A column and the rearview mirror of the car, so that the external aerodynamic wind noise of the whole car can be reduced when the car runs at high speed by improving the wake vortex characteristic of the A column or the rearview mirror; at present, a part of groove structures are added at the position of a rearview mirror/A column to break up large eddy currents so as to achieve the purpose of noise reduction; in the practical use process, the groove structure breaks up large eddy currents to a lower degree, and the large eddy currents still exist to generate wind noise; on the other hand, in a scene where the vehicle is stopped or running at a low speed and noise reduction is not required, the appearance of the rearview mirror cannot be maintained.
Disclosure of Invention
In order to solve the problems, the invention provides an automobile outside rearview mirror and a noise reduction working method thereof, wherein the noise reduction device is arranged to reduce the whole automobile outside aerodynamic wind noise during high-speed running by improving the wake vortex characteristic of the outside rearview mirror during high-speed running of an automobile.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
an exterior rear view mirror for a vehicle, comprising a mirror housing and a lens, wherein the mirror housing is hollow inside and has an open end at a front end thereof, and the lens is rotatably mounted in the open end of the mirror housing, and further comprising:
the noise reduction device is arranged in the rearview mirror shell and is positioned above the lens; the noise reduction device comprises a plurality of fins, a rotating unit and a moving unit; the fins are in a thin plate shape, and a plurality of fins are arranged along a direction perpendicular to the movement direction of the automobile; the rotating unit controls the fins to rotate synchronously, the rotating shafts of the rotating units are parallel to the moving direction of the automobile, and the rotating angles of the rotating units are the same, so that a skewed comb-shaped structure is formed; the moving unit controls the plurality of fins to extend out along the opening direction of the opening end and retract to the rearview mirror housing.
Furthermore, the noise reduction device also comprises a control unit, wherein the control unit is connected with a speed sensor of an automobile; the control unit is used for controlling the motion states of the rotating unit and the moving unit.
Further, the rotating unit comprises a first connecting rod, a first rotating wheel and a motor; the first connecting rods and the first rotating wheels are arranged in plurality and are arranged corresponding to the fins; the first connecting rod is connected with the first rotating wheel, a rotating shaft of the first rotating wheel is parallel to the moving direction of the automobile, the motor is in transmission connection with the first rotating wheel, and the motor drives the first rotating wheel to rotate.
Further, the rotating unit is connected with a plurality of fins; the mobile unit comprises a driver and a linear telescopic unit; the linear telescopic unit is connected with the rotating unit, and the driver drives the linear telescopic unit to do linear reciprocating motion along the motion direction of the automobile.
Further, the rotation angle of the plurality of fins ranges from 20 degrees to 60 degrees.
Further, the fins are made of a hard material.
A noise reduction method for an automobile outside rear-view mirror, further, using an automobile outside rear-view mirror as described above; the method comprises the following steps:
step 1-1, determining the rotation angles of a plurality of fins in the automobile exterior mirror through experiments and simulation;
step 1-2, inputting the numerical value of the rotation angle into the control unit;
step 2-1, installing the automobile rearview mirror to a corresponding position of an automobile; after the automobile is started, the control unit is started; when the control unit detects that the speed per hour of the automobile is continuously lower than 100km/h, the rotating unit and the moving unit are not started, and the fins are mutually contacted and positioned in the rearview mirror shell;
2-2, when the control unit detects that the speed per hour of the automobile is continuously higher than 100km/h, the control unit starts the mobile unit, and the mobile unit stops moving after the plurality of fins completely extend out of the rearview mirror shell along the opening direction of the opening end of the rearview mirror shell; starting the rotating unit, synchronously rotating the plurality of fins to the rotating angle determined in the step 1-1, enabling the rotating shaft of the plurality of fins to be parallel to the moving direction of the automobile to form a skewed comb-shaped structure, and stopping the rotating unit from moving;
2-3, in the process of continuously driving, when the control unit detects that the speed per hour of the automobile is continuously lower than 100km/h, the control unit starts the rotating unit, and the rotating unit stops moving after the fins synchronously rotate in the opposite direction until the fins are contacted with each other; the moving unit is started, the plurality of fins retract into the rearview mirror shell, and the moving unit stops moving.
Further, in the step 1-1, the experiment and simulation method is completed based on the external shape of the vehicle, the shape of the rearview mirror and the structure of the door and window of the vehicle; and analyzing and simulating by using NVH analysis and control technology and pneumatic and acoustic principles.
The invention has the beneficial effects that:
firstly, through the implementation of the scheme, a plurality of fins which are arranged in a direction vertical to the moving direction of the automobile are arranged, when noise reduction is needed, the fins rotate by an angle and extend out of a rearview mirror shell, and an inclined comb tooth structure similar to the outer edge of primary flying feathers of birds is formed above the lenses, so that large air vortexes flowing through the surface of the rearview mirror are filtered into small crushed vortexes, and generation of turbulent noise is inhibited; through rotating element and mobile unit, realize the rotation and the removal of fin, realize when the scene of making an uproar falls in needs, the fin stretches out the rear-view mirror casing, when the scene of making an uproar does not need to fall, the fin retracts back to the rear-view mirror casing, keeps outer rear-view mirror outward appearance smooth and straight.
Secondly, the rotating angle range of the control fins is 20-60 degrees, so that the noise reduction device can realize filtering of vortex and noise reduction, and the whole fluid trend of the vehicle is not damaged as far as possible.
Thirdly, when the automobile outside rearview mirror implements noise reduction work, setting the running speed as a switch for starting and ending the noise reduction work scene; when the speed is lower than 100km/h, the noise is approximately considered to be dominant by other noises such as road noise, and the noise is reduced without filtering the large air vortex flowing through the surface of the rearview mirror into small finely-broken vortex, and the fins are positioned in the rearview mirror shell; when the speed per hour is higher than 100km/h, the dominant effect of external aerodynamic wind noise on noise can be approximately considered, so that a noise reduction working scene is started, and the plurality of fins extend out of the rearview mirror shell and synchronously rotate at the same angle to form an oblique comb-shaped structure; the whole process is automatically finished without manual operation, and the driving habit of a driver is not influenced.
Drawings
FIG. 1 is a schematic structural diagram of the exterior rear view mirror of an automobile when the speed per hour exceeds 100 km/h;
FIG. 2 is a schematic structural view of a fin and a first connecting rod when the speed per hour of the automobile is lower than 100 km/h;
FIG. 3 is a schematic structural diagram of a fin and a first connecting rod when the speed per hour of the automobile exceeds 100 km/h;
description of the symbols:
1. the rearview mirror comprises a rearview mirror shell, 2. lenses, 3. fins and 4-1 first connecting rods.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
As shown in fig. 1, an exterior rear view mirror for an automobile comprises a rear view mirror housing 1, a lens 2 and a noise reduction device, wherein the rear view mirror housing 1 is hollow, the front end of the rear view mirror housing is provided with an opening end, and the lens 2 is rotatably installed in the opening end of the rear view mirror housing 1.
The noise reduction device is arranged in the rearview mirror shell 1 and is positioned above the lens 2; a noise reduction device including a plurality of fins 3, a rotation unit, and a movement unit; the fins 3 are thin plates, and the materials of the fins are hard materials including but not limited to plastics, metals and the like, and the fins 3 are not subjected to yield deformation under the action of aerodynamic force; a plurality of fins 3 are arranged along a direction perpendicular to the moving direction of the automobile, and preferably, a plurality of fins 3 are arranged along the upper edge line of the rearview mirror housing 1; the rotating unit controls the fins 3 to rotate synchronously, the rotating shafts of the rotating units are parallel to the moving direction of the automobile, the rotating angles are the same, and the range of the rotating angles is 20-60 degrees, so that the noise reduction device can realize filtering of eddy currents and noise reduction, and the whole fluid trend of the automobile is not damaged as far as possible; the mobile unit controls the plurality of fins 3 to extend out and retract to the rearview mirror shell 1 along the opening direction of the opening end, an access opening is formed in the side of the opening end of the rearview mirror shell 1 and located above the lens, and the access opening is used for the plurality of fins 3 to extend out and retract to the rearview mirror shell 1; when noise reduction is needed, a plurality of fins which are arranged in a direction perpendicular to the moving direction of the automobile rotate by angles and extend out of the rearview mirror shell, and an inclined comb tooth structure similar to the outer edge of primary flying feathers of birds is formed above the lenses, so that large air vortexes flowing through the surface of the rearview mirror are filtered into small crushed vortexes, and generation of turbulent noise is inhibited.
The control unit is connected with a speed sensor of the automobile; the control unit is used for controlling the motion states of the rotating unit and the moving unit and starting the rotating unit and the moving unit by detecting the running speed of the automobile; the movement of the rotating unit and the moving unit is stopped by a preset rotation angle and a movement distance.
Preferably, the rotating unit comprises a first connecting rod 4-1, a first rotating wheel and a motor; a plurality of first connecting rods 4-1 and a plurality of first rotating wheels are arranged and correspond to the fins 3; the first connecting rod 4-1 is connected with a first rotating wheel, preferably, the first connecting rod 4-1 is inserted into a wheel shaft of the first rotating wheel, the rotating shaft of the first rotating wheel is parallel to the moving direction of the automobile, a motor is in transmission connection with the first rotating wheel, and the motor drives the first rotating wheel to rotate; the first connecting rod 4-1 connected with the first rotating wheel synchronously rotates to drive the fin 3 to rotate.
Preferably, the moving unit comprises a driver and a linear expansion unit; preferably, the driver is an electromagnetic valve, and the linear telescopic unit is an air cylinder; the linear telescopic unit is connected with the rotating unit, and the driver drives the linear telescopic unit to do linear reciprocating motion along the motion direction of the automobile; because the rotating unit is connected with the plurality of fins, when the linear telescopic unit drives the rotating unit to do linear reciprocating motion, the plurality of fins synchronously do linear reciprocating motion to complete the motion of extending and retracting to the rearview mirror shell; through rotating element and mobile unit, realize the rotation and the removal of fin, realize when the scene of making an uproar falls in needs, the fin stretches out the rear-view mirror casing, when the scene of making an uproar does not need to fall, the fin retracts back to the rear-view mirror casing, keeps outer rear-view mirror outward appearance smooth and straight.
1-3, a noise reduction working method of an automobile outside rear-view mirror, using an automobile outside rear-view mirror as described above; the method comprises the following steps:
step 1-1, determining the rotation angles of a plurality of fins in the automobile exterior mirror through experiments and simulation; the method is completed based on the external shape of the vehicle, the shape of a rearview mirror and the structure of a vehicle door and a vehicle window; and analyzing and simulating by using NVH analysis and control technology and pneumatic and acoustic principles.
Step 1-2, inputting the numerical value of the rotation angle into a control unit;
step 2-1, installing the automobile rearview mirror at a corresponding position of an automobile; after the automobile is started, the control unit is started; when the control unit detects that the speed per hour of the automobile is continuously lower than 100km/h, the rotating unit and the moving unit are not started, and the fins are mutually contacted and positioned in the rearview mirror shell;
step 2-2, when the control unit detects that the speed per hour of the automobile is continuously higher than 100km/h, the control unit starts the mobile unit, and the mobile unit stops moving after the plurality of fins completely extend out of the rearview mirror shell along the opening direction of the opening end of the rearview mirror shell; starting the rotating unit, synchronously rotating the fins to the rotating angle determined in the step 1-1, enabling the rotating shaft of the fins to be parallel to the moving direction of the automobile to form a skewed comb-shaped structure, and stopping the rotating unit;
2-3, in the process of running continuously, when the control unit detects that the speed per hour of the automobile is continuously lower than 100km/h, the control unit starts the rotating unit, and the rotating unit stops moving after the fins synchronously rotate in the reverse direction until the fins are contacted with each other; the moving unit is started, the plurality of fins retract into the rearview mirror housing, and the moving unit stops moving.
When the automobile outside rearview mirror implements noise reduction work, the driving speed is set as a switch for starting and ending the noise reduction work scene; when the speed is lower than 100km/h, the noise is approximately considered to be dominant by other noises such as road noise, and the noise is reduced without filtering the large air vortex flowing through the surface of the rearview mirror into small finely-broken vortex, and the fins are positioned in the rearview mirror shell; when the speed per hour is higher than 100km/h, the dominant effect of external aerodynamic wind noise on noise can be approximately considered, so that a noise reduction working scene is started, and the plurality of fins extend out of the rearview mirror shell and synchronously rotate at the same angle to form an oblique comb-shaped structure; the whole process is automatically finished without manual operation, and the driving habit of a driver is not influenced.
The above-mentioned embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention, and any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention; accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. The utility model provides an automobile exterior rear-view mirror, includes rear-view mirror housing and lens, wherein, the inside cavity of rear-view mirror housing, front end are provided with the open end, the lens is rotatory to be installed in the open end of rear-view mirror housing, its characterized in that still includes:
the noise reduction device is arranged in the rearview mirror shell and is positioned above the lens; the noise reduction device comprises a plurality of fins, a rotating unit and a moving unit; the fins are in a thin plate shape, and a plurality of fins are arranged along a direction perpendicular to the movement direction of the automobile; the rotating unit controls the fins to rotate synchronously, the rotating shafts of the rotating units are parallel to the moving direction of the automobile, and the rotating angles of the rotating units are the same, so that a skewed comb-shaped structure is formed; the moving unit controls the plurality of fins to extend out along the opening direction of the opening end and retract to the rearview mirror housing.
2. The exterior rearview mirror of claim 1, wherein the noise reducing device further comprises a control unit connected to a speed sensor of the automobile; the control unit is used for controlling the motion states of the rotating unit and the moving unit.
3. The automobile exterior rear view mirror according to claim 1, wherein the rotation unit includes a first link, a first wheel, and a motor; the first connecting rods and the first rotating wheels are arranged in plurality and are arranged corresponding to the fins; the first connecting rod is connected with the first rotating wheel, a rotating shaft of the first rotating wheel is parallel to the moving direction of the automobile, the motor is in transmission connection with the first rotating wheel, and the motor drives the first rotating wheel to rotate.
4. The automobile exterior rear view mirror according to claim 1, wherein the rotating unit is connected with a plurality of the fins; the mobile unit comprises a driver and a linear telescopic unit; the linear telescopic unit is connected with the rotating unit, and the driver drives the linear telescopic unit to do linear reciprocating motion along the motion direction of the automobile.
5. The exterior rear view mirror for automobiles according to claim 1, wherein the plurality of fins are rotated by an angle in the range of 20 ° -60 °.
6. The exterior rearview mirror of claim 1, wherein the fin is made of a hard material.
7. A method of reducing noise of an exterior mirror for an automobile, characterized by using an exterior mirror for an automobile according to any one of claims 1 to 6; the method comprises the following steps:
step 1, a preparation stage;
step 1-1, determining the rotation angles of a plurality of fins in the automobile exterior mirror through experiments and simulation;
step 1-2, inputting the numerical value of the rotation angle into the control unit;
step 2, implementation stage:
step 2-1, installing the automobile rearview mirror to a corresponding position of an automobile; after the automobile is started, the control unit is started; when the control unit detects that the speed per hour of the automobile is continuously lower than 100km/h, the rotating unit and the moving unit are not started, and the fins are mutually contacted and positioned in the rearview mirror shell;
2-2, when the control unit detects that the speed per hour of the automobile is continuously higher than 100km/h, the control unit starts the mobile unit, and the mobile unit stops moving after the plurality of fins completely extend out of the rearview mirror shell along the opening direction of the opening end of the rearview mirror shell; starting the rotating unit, synchronously rotating the plurality of fins to the rotating angle determined in the step 1-1, enabling the rotating shaft of the plurality of fins to be parallel to the moving direction of the automobile to form a skewed comb-shaped structure, and stopping the rotating unit from moving;
2-3, in the process of continuously driving, when the control unit detects that the speed per hour of the automobile is continuously lower than 100km/h, the control unit starts the rotating unit, and the rotating unit stops moving after the fins synchronously rotate in the opposite direction until the fins are contacted with each other; the moving unit is started, the plurality of fins retract into the rearview mirror shell, and the moving unit stops moving.
8. The noise reduction method for the outside rearview mirror of the automobile according to claim 7, wherein in the step 1-1, the experiment and simulation method is completed based on the external shape of the automobile, the shape of the rearview mirror and the structure of the door window; and analyzing and simulating by using NVH analysis and control technology and pneumatic and acoustic principles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110582757.6A CN113212311A (en) | 2021-05-26 | 2021-05-26 | Automobile external rearview mirror and noise reduction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110582757.6A CN113212311A (en) | 2021-05-26 | 2021-05-26 | Automobile external rearview mirror and noise reduction method thereof |
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| CN113212311A true CN113212311A (en) | 2021-08-06 |
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| CN202110582757.6A Pending CN113212311A (en) | 2021-05-26 | 2021-05-26 | Automobile external rearview mirror and noise reduction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113670586A (en) * | 2021-08-18 | 2021-11-19 | 河南科技大学 | Noise and sound insulation detection device for automobile outer rearview mirror |
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2021
- 2021-05-26 CN CN202110582757.6A patent/CN113212311A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113670586A (en) * | 2021-08-18 | 2021-11-19 | 河南科技大学 | Noise and sound insulation detection device for automobile outer rearview mirror |
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