Automobile hidden tail diffusion structure

Abstract

The application relates to a hidden tail diffusion structure of an automobile. The hidden tail diffusion structure of the automobile comprises a rear bumper, a bumper skin and a bumper cover, the bumper cover is fixed in cooperation with the bumper skin; a diffuser is fixed in cooperation with the bottom of the rear bumper, front mounting brackets and rear mounting brackets are arranged on the diffuser, the diffuser is connected and fixed with the rear floor of the automobile through the front mounting brackets, and the diffuser is connected and fixed with the rear wall of the automobile through the rear mounting brackets. The application provides the hidden tail diffusion structure of the automobile, which can reduce the rear lift and air resistance of the vehicle and improve the high-speed steering stability of the vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automotive aerodynamics and exterior trim manufacturing technology, and particularly relates to a hidden rear diffuser structure of a vehicle. BACKGROUND

[0002] With the continuous improvement of vehicle power performance and the continuous improvement of road infrastructure, the average speed of vehicle traffic is gradually increasing, which puts higher requirements on the high-speed handling stability of the vehicle. The rear diffuser has been increasingly used in various types of vehicles. The rear diffuser, which was commonly used in high-performance vehicles such as racing cars and sports cars in the past, is now gradually used in daily family vehicles as vehicle performance improves. This functional component is mainly installed on the rear bumper skin of the vehicle, and guides the airflow at the rear of the vehicle to reduce the air lift at the rear of the vehicle and improve the high-speed handling stability of the vehicle.

[0003] However, the design of the rear area of the vehicle needs to take into account many factors, such as vehicle maintenance economy, rear part space layout, sensor arrangement position, production cost and many other technical requirements, and also needs to take into account the appearance of the model. In order to reduce the lift of the rear of the vehicle by a large margin, a single-layer diffuser needs to occupy a larger space, which will affect the arrangement of the rear exhaust tailpipe, muffler, spare tire, sensor and other components of the vehicle, and will also affect the size of the trunk. At the same time, the large rear diffuser needs to change the rear structure of the vehicle body, resulting in an increase in production cost, and will also affect the vehicle modeling design. Through simulation analysis, it is found that the single-layer diffuser of a conventional size on a family car has a limited positive effect on the rear lift of the vehicle.

[0004] Taking an existing vehicle type as an example, in order to achieve better aerodynamic performance, a large single-layer rear diffuser is used, which occupies a lot of x-direction and z-direction space at the rear of the vehicle, greatly limits the arrangement of other rear components, has a large limitation on the modeling design, and also has a high production cost.

[0005] Taking another type of vehicle as an example, the diffuser is a double-layer structure, which can effectively reduce the lift at the rear of the vehicle and has excellent aerodynamic effect. However, this design requires the addition of diffuser parts, which increases the cost, and in addition, there are difficulties in part arrangement and high modeling limitations.

[0006] In addition, some SUV vehicle types make the rear space of the vehicle relatively ample, and the freedom of modeling and arrangement is relatively large. However, the rear diffuser of an ordinary car is still used, and the rear space is not fully utilized to improve the aerodynamic performance and handling stability of the vehicle. SUMMARY

[0007] Aiming at the above problems of the prior art, the application provides a hidden tail diffusion structure of an automobile, which can reduce the lift and air resistance of the rear part of the automobile, improve the high-speed steering stability of the automobile, reduce the energy consumption of the automobile and improve the cruising range.

[0008] Specifically, the application provides a hidden tail diffusion structure of an automobile, which comprises:

[0009] A rear bumper, which comprises a bumper skin and a bumper cover, and the bumper cover is fixed with the bumper skin in cooperation;

[0010] A diffuser, which is fixed with the bottom of the rear bumper, and a front mounting bracket and a rear mounting bracket are arranged on the diffuser, the diffuser is connected and fixed with the rear floor of the automobile through the front mounting bracket, and the diffuser is connected and fixed with the rear wall of the automobile through the rear mounting bracket.

[0011] According to one embodiment of the application, the tail of the diffuser has a bending structure, the diffuser comprises a body, a lower bending part and an upper bending part, and the lower bending part and the upper bending part form the bending structure.

[0012] The bottom of the lower bending part is connected with the tail of the body, a narrow gap is formed at the connection position of the bottom of the lower bending part and the body, the bottom of the upper bending part is connected and fixed with the top of the lower bending part, the top of the upper bending part is connected and fixed with the rear bumper, and a polygonal grid is formed in the upper bending part.

[0013] According to one embodiment of the application, the hidden tail diffusion structure of the automobile has three layers of airflow channels, which comprise an upper layer of airflow channels, a middle layer of airflow channels and a lower layer of airflow channels.

[0014] The bumper skin forms an extension part in the forward direction, an upper layer of airflow channels is formed between the extension part and the connection position of the upper and lower bending parts of the diffuser, and the gas passes through the upper layer of airflow channels and diffuses outward through the polygonal grid;

[0015] A middle layer of airflow channels is formed between the connection position of the upper and lower bending parts of the diffuser and the body, and the gas passes through the middle layer of airflow channels and diffuses outward through the narrow gap;

[0016] A lower layer of airflow channels is formed between the body and the ground.

[0017] According to one embodiment of the application, a flow guide structure is arranged on the surface of the body of the diffuser.

[0018] According to one embodiment of the application, the diffuser is a single injection molding part.

[0019] According to one embodiment of the present application, the top of the upper bent portion is snap-fit fixed with the bottom of the bumper skin.

[0020] According to one embodiment of the present application, the top of the upper bent portion is snap-fit fixed with the bottom of the bumper skin.

[0021] According to one embodiment of the present application, the top of the upper bent portion is snap-fit fixed with the bottom of the bumper skin.

[0022] According to one embodiment of the present application, the top of the upper bent portion is snap-fit fixed with the bottom of the bumper skin.

[0023] According to one embodiment of the present application, the top of the upper bent portion is snap-fit fixed with the bottom of the bumper skin.

[0024] The application provides a hidden tail diffusion structure of an automobile, which is matched with a rear bumper and a vehicle body through a diffuser, can effectively comb and guide air flow at a tail of the vehicle, reduce air lift at the tail of the vehicle, and improve high-speed steering stability of the vehicle.

[0025] It should be understood that the above general description and the following detailed description of the application are exemplary and illustrative, and are intended to provide further explanation of the application as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application, illustrate embodiments of the application, and together with the description serve to explain the principles of the application.

[0027] In the drawings:

[0028] Figure 1 A structural schematic view of a hidden tail diffusion structure of an automobile according to one embodiment of the application is shown.

[0029] Figure 2 is an assembly schematic view of Figure 1

[0030] Figure 3 A tail schematic view of a hidden tail diffusion structure of an automobile according to one embodiment of the application is shown.

[0031] Figure 4 is an AA-directional sectional view of Figure 3

[0032] Figure 5 is a BB-directional sectional view of Figure 3

[0033] Figure 6 Figure 3 ​​​​A cross-sectional view of the CC.

[0034] Figure 7 A flow simulation and velocity streamline diagram of a tail diffuser structure of a mass production vehicle in the prior art.

[0035] Figure 8 A flow simulation and velocity streamline diagram of a hidden tail diffuser structure of a vehicle according to an embodiment of the present application.

[0036] Figure 9 A surface pressure distribution diagram of a vehicle tail of a mass production vehicle in the prior art.

[0037] Figure 10 A surface pressure distribution diagram of a hidden tail diffuser structure of a vehicle according to an embodiment of the present application.

[0038] Wherein, the above-mentioned drawings include the following reference signs:

[0039] Tail diffuser structure 100

[0040] Rear bumper 101

[0041] Diffuser 102

[0042] Bumper skin 103

[0043] Bumper cover 104

[0044] Front mounting bracket 105

[0045] Rear mounting bracket 106

[0046] Body 107

[0047] Lower bend 108

[0048] Upper bend 109

[0049] Narrow slit 110

[0050] Polygonal mesh 111

[0051] Upper airflow channel 112

[0052] Middle airflow channel 113

[0053] Lower airflow channel 114

[0054] Extension 115

[0055] Rear wall 116 DETAILED DESCRIPTION

[0056] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0057] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the application and its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0058] It is to be noted that the terms used herein are merely for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular forms are intended to include the plural forms, unless the context clearly indicates otherwise, and it should be further understood that the terms "comprise" and / or "include" when used herein specify the presence of stated features, steps, operations, devices, components and / or combinations thereof.

[0059] The relative arrangement of the components and steps, numerical expressions, and numerical values set forth in the embodiments are not intended to limit the scope of the present application, unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description, if appropriate. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as limiting. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0060] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of the components themselves.

[0061] For purposes of the description hereinafter, spatially relative terms, such as "above", "below", "up", "down", "between", "within", "left", "right", "rear", "front", "upper", "lower", "horizontal", "vertical", "above", "below", "top", "bottom", "under", and the like, can be used for ease of description to describe one element's or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The terms "first", "second", "third", etc., do not necessarily indicate any ordinal, chronological or other sequence unless expressly stated to do so.

[0062] In addition, it should be noted that the use of "first", "second", and the like, terminology to describe various components in the above disclosure is merely used to differentiate one component from another, and is not intended to or should be construed to special order, unless otherwise stated. In addition, although the terms used in the present application are selected from well-known and commonly used terms, some terms mentioned in the specification of the present application can be selected by the applicant according to his or her judgment, and the detailed meaning of each term is described in the relevant part of the description. In addition, the present application is not only understood by the actual terms used, but also by the meaning implied by each term.

[0063] Figure 1 The structural schematic diagram of the automobile hidden tail diffusion structure of one embodiment of the present application is shown. Figure 2 is Figure 1 The assembly schematic diagram. Figure 3 The tail schematic diagram of the automobile hidden tail diffusion structure of one embodiment of the present application is shown. As shown in the figure, the present application provides an automobile hidden tail diffusion structure 100, mainly including a rear bumper 101 and a diffuser 102.

[0064] The rear bumper 101 includes a bumper skin 103 and a bumper cover 104. The bumper cover 104 is fixed with the bumper skin 103.

[0065] The tail of the diffuser 102 is fixed with the bottom of the rear bumper 101. The front mounting bracket 105 and the rear mounting bracket 106 are provided on the diffuser 102. The diffuser 102 is connected and fixed with the rear floor of the automobile through the front mounting bracket 105, and the diffuser 102 is connected and fixed with the rear wall of the automobile through the rear mounting bracket 106.

[0066] Figure 4 isFigure 3 A sectional view along line AA. Figure 5 yes Figure 3 BB-direction sectional view. Figure 6 yes Figure 3 A cross-sectional view along the CC direction is shown. As shown, preferably, the tail of the diffuser 102 has a bent structure. The diffuser 102 includes a body 107, a lower bent portion 108, and an upper bent portion 109. The lower bent portion 108 and the upper bent portion 109 form the bent structure of the diffuser 102.

[0067] The bottom of the lower bend 108 connects to the tail of the main body 107, and a narrow slit 110 is formed at the connection point between the bottom of the lower bend 108 and the main body 107. Figure 3 As shown, the narrow slit 110 consists of multiple long, narrow rectangular gaps. Furthermore, the bottom of the upper bend 109 is connected and fixed to the top of the lower bend 108, and the top of the upper bend 109 is connected and fixed to the rear bumper 101. Combined Figure 3 As shown, a polygonal grid 111 is formed in the upper bend 109 to release the tail airflow. By way of example and not limitation, the polygonal grid 111 is a hexagonal grid.

[0068] Better, refer to Figure 4 The car's hidden rear diffuser structure 100 has three layers of airflow channels, including an upper airflow channel 112, a middle airflow channel 113, and a lower airflow channel 114.

[0069] The bumper skin 103 forms a forward extension 115. An upper airflow channel 112, a concealed airflow channel, is formed between the extension 115 and the upper and lower bends 108 of the diffuser 102. This upper airflow channel 112 is located approximately between the first and second dotted lines from top to bottom. Gas diffuses outward from left to right through the hexagonal grid of the upper bend 109 via the upper airflow channel 112. This structure maximizes the airflow area and improves aerodynamic performance.

[0070] A mid-level airflow channel 113 is formed between the connection points of the upper and lower bends 109 and 108 of the diffuser 102 and the main body 107. The mid-level airflow channel 113 is located between the third and fourth dotted lines from top to bottom. Gas diffuses outward from left to right through the mid-level airflow channel 113 and the narrow slit 110.

[0071] A lower airflow channel 114 is formed between the main body 107 and the ground, located between the fifth and sixth dotted lines from top to bottom.

[0072] Preferably, the body 107 of the diffuser 102 has a guide structure on the surface thereof, which involves a fin design, for reducing the lift at the rear of the vehicle. More preferably, the diffuser 102 is a single injection molded part, which is easy to mass produce. The size of the space occupied by the diffuser 102 is basically the same as that of the single-layer diffuser in the prior art.

[0073] Preferably, the top of the upper bent portion 109 is snap-fitted with the bottom of the bumper skin 103. More preferably, the top of the upper bent portion 109 is snap-fitted with the bottom of the bumper cover 104 and is located adjacent to the position where the upper bent portion 109 is snap-fitted with the bumper skin 103. This structure is beneficial to improving the overall assembly efficiency. Figure 3 Figure 4 Preferably, the bottom of the front mounting bracket 105 and the rear mounting bracket 106 is bolted to the upper surface of the body 107. More preferably, the top of the front mounting bracket 105 and the rear mounting bracket 106 is welded to the rear floor and the rear wall 116 respectively, which is beneficial to improving the rigidity of the diffuser 102 and avoiding low-frequency flutter of the air flowing through the surface of the diffuser 102.

[0074] Preferably, the upper bent portion 109 has a reinforcing rib, which is beneficial to improving the part strength of the upper bent portion 109.

[0075] Preferably, the bottom of the front mounting bracket 105 and the rear mounting bracket 106 is bolted to the upper surface of the body 107. More preferably, the top of the front mounting bracket 105 and the rear mounting bracket 106 is welded to the rear floor and the rear wall 116 respectively, which is beneficial to improving the rigidity of the diffuser 102 and avoiding low-frequency flutter of the air flowing through the surface of the diffuser 102.

[0076] Under the condition that other parameters and designs of the vehicle remain unchanged, based on the data of a certain mass-produced vehicle, the flow field simulation of the vehicle with the hidden rear diffuser structure 100 of the application is carried out under the condition of 140 km / h. The simulation results are shown in the following table:

[0077] Production car solution The present solution Optimization effect Drag coefficient 0.323 0.314 -0.009 Lift coefficient 0.178 0.165 -0.013

[0078] Figure 7 is the flow simulation and speed flow diagram of the tail diffuser structure of a mass-produced vehicle in the prior art. Figure 8 shows the flow simulation and speed flow diagram of the hidden rear diffuser structure of the vehicle according to an embodiment of the application. Figure 9 is the surface pressure distribution diagram of the tail of a mass-produced vehicle in the prior art. Figure 10 shows the surface pressure distribution diagram of the tail of the hidden rear diffuser structure of the vehicle according to an embodiment of the application.

[0079] ​As shown in the figure, from the velocity flow field, it can be seen that in the mass production vehicle scheme, the airflow separates after passing through the muffler, reattaches at the diffuser, separates at the edge of the diffuser bottom into the wake region, and enters the wake region with a relatively gentle airflow direction. After replacing the scheme of the application, the airflow separates after passing through the muffler and quickly reattaches to the surface of the vehicle body at the diffuser 102 part, and the angle and speed of the airflow entering the wake region are significantly increased compared with the mass production vehicle scheme, guiding the bottom airflow to enter the wake region at a larger angle, and the bottom airflow affects the flow field at the tail vortex. Compared with the mass production vehicle scheme, the application scheme makes the automobile wake region smaller, and the tail vortex position is lifted. The change of the tail vortex brings the change of the back pressure of the vehicle body. The surface pressure distribution of the vehicle tail is shown in Figure 10

[0080] After adopting the scheme of the application, the static pressure coefficient of the tail part of the vehicle is significantly increased in the middle part, and the static pressure is also significantly increased at the left and right edges of the upper part of the tail, thereby increasing the aerodynamic thrust received by the vehicle in the driving direction, and reducing the air resistance coefficient.

[0081] The simulation results show that the hidden tail diffuser structure 100 can effectively improve the airflow at the rear of the vehicle. The simulation data shows that the lift (rear lift) coefficient of the rear of the vehicle is reduced by 0.013, from 0.178 of the mass production vehicle scheme to 0.165; the air resistance coefficient is reduced by about 0.009, from 0.323 of the mass production vehicle to 0.314. Therefore, the hidden tail diffuser structure 100 provided by the application can effectively reduce the lift at the rear of the vehicle, significantly improve the high-speed handling stability of the vehicle; and reduce the air resistance of the vehicle and reduce fuel consumption.

[0082] The hidden tail diffuser structure for a vehicle provided by the application has the following advantages:

[0083] 1. Under the same size, compared with the single-layer diffuser of the prior art, the lift can be reduced more, the aerodynamic performance of the vehicle can be improved, and the handling stability can be improved;

[0084] 2. The diffuser occupies a smaller space in the x direction and the z direction, and has a smaller influence on the arrangement of sensors, mufflers, exhaust tail pipes and other rear parts of the vehicle;

[0085] 3. The hidden design has a small restriction on the vehicle modeling;

[0086] 4. The modification range of the existing vehicle parts is small, and the production cost is effectively reduced;

[0087] 5. The lift at the rear is reduced while the resistance is reduced.

[0088] ​As will be apparent to those of ordinary skill in the art, various modifications and variations can be made to the above-described exemplary embodiments of the present application without departing from the spirit and scope of the present application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A hidden tail diffuser structure of a vehicle, comprising: a rear bumper comprising a bumper skin and a bumper cover, the bumper cover being fixedly engaged with the bumper skin; a diffuser fixedly engaged with a bottom of the rear bumper, the diffuser being provided with a front mounting bracket and a rear mounting bracket, the diffuser being fixedly connected with a rear floor of the vehicle through the front mounting bracket, and the diffuser being fixedly connected with a rear wall of the vehicle through the rear mounting bracket; a tail of the diffuser having a bending structure, the diffuser comprising a body, a lower bending portion and an upper bending portion, the lower bending portion and the upper bending portion forming the bending structure; a bottom of the lower bending portion being connected with a tail of the body, a connection position of the bottom of the lower bending portion with the body forming a narrow gap, a bottom of the upper bending portion being fixedly connected with a top of the lower bending portion, and a top of the upper bending portion being fixedly connected with the rear bumper, a polygonal grid being formed in the upper bending portion; the hidden tail diffuser structure of the vehicle having three layers of airflow channels, comprising an upper layer of airflow channels, a middle layer of airflow channels and a lower layer of airflow channels; the bumper skin forming an extension in a forward direction, an upper layer of airflow channels being formed between the extension and a connection position of the upper and lower bending portions of the diffuser, and gas being diffused outwardly through the upper layer of airflow channels and the polygonal grid; a middle layer of airflow channels being formed between the connection position of the upper and lower bending portions of the diffuser and the body, and gas being diffused outwardly through the middle layer of airflow channels and the narrow gap; a lower layer of airflow channels being formed between the body and the ground.

2. The automobile hidden rear diffuser structure of claim 1, wherein, a flow guide structure being provided on a surface of the body of the diffuser.

3. The automobile hidden rear diffuser structure of claim 1, wherein, the diffuser being a single injection molding part.

4. The automobile hidden rear diffuser structure of claim 1, wherein, the top of the upper bending portion being fixedly engaged with a bottom of the bumper skin in a snap-fit manner.

5. The automobile hidden rear diffuser structure of claim 4, wherein, the top of the upper bending portion being fixedly engaged with a bottom of the bumper cover in a snap-fit manner.

6. The automobile hidden rear diffuser structure of claim 1, wherein, bottoms of the front and rear mounting brackets being fixedly screwed on an upper surface of the body.

7. The automobile hidden rear diffuser structure of claim 6, wherein, tops of the front and rear mounting brackets being fixedly welded with the rear floor and the rear wall, respectively.

8. The hidden underbody diffuser of claim 1, wherein, the upper bending portion being provided with a reinforcing rib.

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