Source: https://patents.google.com/patent/JP2008037396A/en
Timestamp: 2020-08-15 09:04:00
Document Index: 41387464

Matched Legal Cases: ['art 18', 'art 20', 'art 24', 'art 24', 'art 24', 'art 24', 'art 26', 'art 26', 'art 26', 'art 26', 'art 24', 'art 26', 'art 26', 'art 28']

JP2008037396A - Automobile rear part structure - Google Patents
Automobile rear part structure Download PDF
JP2008037396A
JP2008037396A JP2006218252A JP2006218252A JP2008037396A JP 2008037396 A JP2008037396 A JP 2008037396A JP 2006218252 A JP2006218252 A JP 2006218252A JP 2006218252 A JP2006218252 A JP 2006218252A JP 2008037396 A JP2008037396 A JP 2008037396A
JP2006218252A
JP4380670B2 (en
Ken Tsuruta
孝夫 伊藤
晴彦 山本
宏明 岩本
憲 鶴田
2006-08-10 Application filed by Toyota Motor Corp, トヨタ自動車株式会社 filed Critical Toyota Motor Corp
2006-08-10 Priority to JP2006218252A priority Critical patent/JP4380670B2/en
2008-02-21 Publication of JP2008037396A publication Critical patent/JP2008037396A/en
2009-12-09 Publication of JP4380670B2 publication Critical patent/JP4380670B2/en
<P>PROBLEM TO BE SOLVED: To suppress an air stream under a vehicle body floor from being disturbed by an exhaust gas discharged from a muffler. <P>SOLUTION: The exhaust gas discharged from between a front end of a diffuser 20 and a body part 18A of the muffler 18 toward below is guided in a direction downward inclined toward a rear side of the vehicle body by an inclination part 20D and a first guide part 24A of a first flow-regulation plate 24. Thereafter, it is guided in a direction along the air stream U flowing under the floor of the vehicle body 14 by an outer periphery 20E of a front end of the diffuser 20 and a second guide part 24B of the first flow-regulation plate 24 and is merged to the air stream U. <P>COPYRIGHT: (C)2008,JPO&INPIT
The present invention relates to an automobile rear structure.
Conventionally, a muffler having a substantially flat cross section is horizontally placed under the floor lower surface near the rear overhang portion located above the floor lower surface of the wheel base portion, and the lowermost surface of the muffler is disposed on the wheel lower surface. There has been proposed an under-floor structure at the rear of an automobile positioned above the floor lower surface of the base portion and above the lower end of the rear bumper (see, for example, Patent Document 1). In this underfloor structure, the muffler functions as an aerodynamic component, thereby preventing a decrease in the flow velocity and separation of the air flowing under the floor of the vehicle body and improving the aerodynamic performance of the automobile.
By the way, a part of the exhaust gas discharged from the muffler may enter between the rear bumper cover and the vehicle body, but the exhaust gas and the pressure entering between the rear bumper cover and the vehicle body are downward from both sides. And may merge vertically with the airflow under the vehicle floor. In this case, the airflow under the vehicle body floor is disturbed, which causes the aerodynamic performance of the automobile to deteriorate.
JP-A-7-165126
In view of the above fact, an object of the present invention is to obtain an automobile rear structure capable of suppressing the air flow under the vehicle body floor from being disturbed by the exhaust gas discharged from the muffler.
The rear structure of the automobile according to the first aspect of the present invention is disposed on the rear side of the muffler and interferes with the exhaust gas exhausted from the muffler and causes a part of the exhaust gas to be directed downward. An arrangement member, and a rectifying means provided on the lower side of the muffler for guiding the exhaust gas going downward to a direction along the air flow under the floor of the vehicle body and joining the air flow are characterized.
In the rear structure of the vehicle according to claim 1, a part of the exhaust gas that is discharged from the muffler and interferes with the rear-side arrangement member and goes downward is rectified by a rectifying means provided on the lower side of the muffler. It is guided in a direction along the air flow and merges with the air flow. Therefore, the air flow under the vehicle body floor can be prevented from being disturbed by the exhaust gas discharged from the muffler.
According to a second aspect of the present invention, the rear structure of the vehicle according to the first aspect of the present invention is the rear structure of the first aspect, wherein the rear arrangement member is formed in a cylindrical shape and the muffler pipe of the muffler is disposed in the opening on the front end side. A diffuser for accommodating and exhausting exhaust gas discharged from the muffler pipe from an opening on a rear end side, and a part of the exhaust gas faces downward from between a front end portion of the diffuser and a main body portion of the muffler The rectifying means is provided at a lower portion of the front end portion of the diffuser.
In the automobile rear structure according to the invention of claim 2, the exhaust gas discharged downward from between the front end portion of the diffuser and the main body portion of the muffler is rectified by a rectifying means provided at a lower portion of the front end portion of the diffuser. It is guided in a direction along the air flow under the vehicle body floor and merges with the air flow. Accordingly, it is possible to suppress the air flow under the vehicle body floor from being disturbed by the exhaust gas discharged from between the front end portion of the diffuser and the main body portion of the muffler.
According to a third aspect of the present invention, there is provided a rear structure of the vehicle according to the first or second aspect of the present invention, wherein the rear side arrangement member has a rear bumper cover, and a part of the exhaust gas is It is discharged downward from between the rear bumper cover and the vehicle body, and the rectifying means is provided at a lower portion of the rear bumper cover.
In the vehicle rear structure according to the third aspect of the invention, the exhaust gas discharged downward from between the rear bumper cover and the vehicle body follows the air flow under the vehicle body floor by the rectifying means provided at the lower portion of the rear bumper cover. It is guided in the direction and joins the air flow. Therefore, it is possible to suppress the air flow under the vehicle body floor from being disturbed by the exhaust gas discharged from between the rear bumper cover and the vehicle body.
According to a fourth aspect of the present invention, there is provided a rear structure of the vehicle according to any one of the first to third aspects, wherein the rear-side arrangement member includes a rear bumper cover, A floor cover having a rear end overlapped with a lower end portion of the rear bumper cover and a discharge hole formed on the rear end side is attached under the floor, and a part of the exhaust gas is discharged downward from the discharge hole. In addition, the rectifying means has an inclined portion provided at a hole edge portion of the discharge hole.
In the rear structure of the automobile according to claim 4, the exhaust gas discharged downward from the exhaust hole of the floor cover is guided in the direction along the air flow under the vehicle body floor by the inclined portion provided at the hole edge of the exhaust hole. To join the air flow. Therefore, it is possible to suppress the air flow under the vehicle body floor from being disturbed by the exhaust gas discharged from the discharge hole of the floor cover.
According to a fifth aspect of the present invention, there is provided the rear structure of the vehicle according to any one of the first to fourth aspects, wherein the rectifying means is inclined downward toward the rear side of the vehicle body. It has a baffle plate provided with 1 guide part and the 2nd guide part extended toward the back of the body from the lower end of the 1st guide part.
In the rear structure of the vehicle according to claim 5, the exhaust gas that travels downward while interfering with the rear-side arrangement member is guided by the first guide portion of the rectifying plate in a direction inclined downward toward the rear side of the vehicle body. Later, the second guide portion of the current plate guides the vehicle in the direction along the air flow behind the vehicle body, that is, under the vehicle body floor. In this way, since the exhaust gas can be guided by providing the two guide portions on the rectifying plate, the rectifying means can be simplified.
As described above, in the automobile rear structure according to claim 1 of the present invention, it is possible to suppress the air flow under the vehicle body floor from being disturbed by the exhaust gas exhausted from the muffler.
In the automobile rear structure according to claim 2 of the present invention, it is possible to suppress the air flow under the vehicle body floor from being disturbed by the exhaust gas discharged from between the front end portion of the diffuser and the main body portion of the muffler.
In the vehicle rear structure according to claim 3 of the present invention, it is possible to suppress the air flow under the vehicle body floor from being disturbed by the exhaust gas discharged from between the rear bumper cover and the vehicle body.
In the automobile rear structure according to claim 4 of the present invention, it is possible to suppress the air flow under the vehicle body floor from being disturbed by the exhaust gas exhausted from the exhaust hole of the floor cover.
In the automobile rear structure according to claim 5 of the present invention, the rectifying means can be configured simply.
An embodiment of the present invention will be described with reference to FIGS. In the figure, the arrow FR indicates the vehicle front direction, the arrow UP indicates the vehicle upward direction, and the arrow W indicates the vehicle width direction.
FIG. 1 is a side view showing a configuration of a rear portion of an automobile 12 configured by applying the automobile rear structure according to the embodiment of the present invention. FIG. 2 shows a rear view of the rear configuration of the automobile 12. As shown in FIGS. 1 and 2, a rear bumper cover 16 is attached to the rear portion of the vehicle body 14 of the automobile 12, and the rear bumper cover 16 is disposed at the rearmost end portion of the automobile 12 along the vehicle width direction. Cover body 16A, and side wall portions 16B extending from both ends of the cover body 16A in the vehicle width direction toward the front of the vehicle body.
In front of the cover body 16A, a pair of mufflers 18 are disposed on both sides in the vehicle width direction. These mufflers 18 have a main body portion 18A and a muffler pipe 18B protruding rearward from the main body portion 18A, and exhaust gas of an engine (not shown) is rearward from the muffler pipe 18B (cover main body 16A side). Discharge towards
As shown in FIG. 2, diffusers 20 are provided at both ends of the cover main body 16A in the vehicle width direction. These diffusers 20 are formed of a metal material in a substantially trumpet shape, and as shown in FIGS. 3 to 7, the front end side opening 20A disposed on the front side of the vehicle body is substantially circular. The rear end side opening 20B disposed on the rear side of the vehicle body has a substantially rectangular shape that is long along the vehicle width direction. As shown in FIG. 8, the diffuser 20 is fastened to the rear bumper cover 16 by a plurality of bolts with the rear end portion disposed in a through hole 22 formed in the cover body 16 </ b> A. The outer side (rear side of the vehicle body) and the inner side (front side of the vehicle body) of the cover main body 16A communicate with each other through the cylinder. A baffle portion 20 </ b> C that covers the hole edge of the through hole 22 is provided at the rear end portion of the diffuser 20.
A muffler pipe 18B of the muffler 18 is accommodated substantially coaxially inside the front end side opening 20A of the diffuser 20, and the exhaust gas discharged from the muffler pipe 18B passes through the inside of the diffuser 20 and the rear end of the diffuser 20. The vehicle is discharged from the side opening 20B to the rear of the vehicle body (see arrow A in FIG. 8). However, when the amount of exhaust gas discharged from the muffler pipe 18B increases, a high pressure is generated inside the diffuser 20, and a part of the exhaust gas may flow backward toward the front side of the vehicle body. The exhaust gas flowing backward and its pressure pass between the muffler pipe 18B and the inner surface of the front end opening 20A, and are discharged downward from between the front end of the diffuser 20 and the main body 18A of the muffler 18 ( (See arrow B in FIG. 8). Further, the exhaust gas flowing backward and its pressure enter between the cover main body 16A of the rear bumper cover 16 and the vehicle body 14 (lower back panel 14A), and exhaust downward from between the cover main body 16A and the lower back panel 14A. Is done.
Here, in this embodiment, as shown in FIGS. 4, 6, and 7, the lower portion of the front end portion of the diffuser 20 is bent inward in the radial direction and inclined downward toward the rear side of the vehicle body. An inclined portion 20D (rectifying means) is formed. Therefore, the exhaust gas discharged downward from between the front end portion of the diffuser 20 and the main body portion 18A of the muffler 18 passes between the inclined portion 20D and the main body portion 18A of the muffler 18, but this passage In this case, the exhaust gas is caused to flow toward the inclined portion 20D by the wind pressure of the air flow U (the wind of the automobile 12 that is rectified, see FIG. 8) flowing under the floor of the vehicle body 14. The exhaust gas flowed to the inclined portion 20D side is guided by the inclined portion 20D in a direction inclined downward toward the rear side of the vehicle body, and then along the air flow U by the outer periphery 20E (rectifying means) of the front end portion of the diffuser 20. It is guided in the direction and merges with the air flow U.
In the present embodiment, the lower end of the front end portion of the diffuser 20 is provided with a first rectifying plate 24 that constitutes a rectifying means. The first current plate 24 is formed by bending a metal plate material, and has a first guide portion 24A that is inclined downward toward the rear side of the vehicle body. A second guide portion 24B extends from the lower end of the first guide portion 24A toward the rear of the vehicle body, and the second guide portion 24B is disposed horizontally with respect to the vehicle body 14. A vertical wall portion 24C extends upward from the rear end of the second guide portion 24B, and a coupling portion 24D extends from the upper end of the vertical wall portion 24C toward the rear of the vehicle body. . The coupling portion 24D is coupled to the lower end of the front end portion of the diffuser 20 by welding or the like, whereby the first rectifying plate 24 is attached to the diffuser 20.
For this reason, exhaust gas (see arrow B in FIG. 8) discharged downward from between the front end portion of the diffuser 20 and the main body portion 18 </ b> A of the muffler 18 is used for the first rectifying plate 24 and the main body portion 18 </ b> A of the muffler 18. The exhaust gas is caused to flow toward the first guide portion 24A by the wind pressure of the air flow U flowing under the floor of the vehicle body 14 during the passage. The exhaust gas flowed to the first guide portion 24A side is guided by the first guide portion 24A in the direction of inclining downward toward the rear side of the vehicle body, and then, in the direction along the air flow U by the second guide portion 24B. It is guided to join the air flow U (see arrow C in FIG. 8).
As shown in FIG. 9, the length dimension L1 of the first guide part 24A of the first rectifying plate 24 and the length dimension L2 of the second guide part 24B are preferably set to 5 mm or more. The inclination angle θ of the first guide portion 24A with respect to the second guide portion 24B is preferably set as small as possible within the range of 30 degrees to 45 degrees. This also applies to the first guide portion 26A and the second guide portion 26B of the second rectifying plate 26 described below.
Further, in the present embodiment, as shown in FIGS. 3 and 4, a second rectifying plate 26 constituting a rectifying unit is provided below the diffuser 20. As shown in FIGS. 10 and 11, the second rectifying plate 26 is formed in a long plate shape, and is attached to the lower end of the cover main body 16 </ b> A in a state where the longitudinal direction is along the vehicle width direction. As shown in FIG. 12, the second rectifying plate 26 includes a first guide part 26A that is inclined downward toward the rear side of the vehicle body, and a first guide part 26A that extends from the lower end of the first guide part 26A toward the rear side of the vehicle body. 2 guide part 26B. As shown in FIG. 4, the first guide portion 26 </ b> A has a cutout portion 26 </ b> F formed at a portion disposed directly below the diffuser 20.
An attachment piece 26C is provided at the rear end portion of the second guide portion 26B, and the second guide portion is inserted in a state where the lower end portion of the cover body 16A is inserted into the attachment groove 26D formed in the attachment piece 26C. The second straightening plate 26 is attached to the lower end of the cover main body 16A by fastening the bolt inserted into the through hole 26E (see FIG. 10) formed in the 26B to the cover main body 16A.
Therefore, the exhaust gas (see arrow D in FIG. 12) discharged downward from between the cover main body 16A and the lower back panel 14A passes between the second rectifying plate 26 and the lower back panel 14A. However, during this passage, the exhaust gas is caused to flow toward the first guide portion 26 </ b> A by the wind pressure of the air flow U flowing under the floor of the vehicle body 14. The exhaust gas that has flowed toward the first guide portion 26A is guided in a direction that inclines downward toward the rear of the vehicle body by the first guide portion 26A, and then in the direction along the air flow U by the second guide portion 26B. It is guided to join the air flow U (see arrow E in FIG. 12). No member other than the cover main body 16A is arranged behind the second rectifying plate 26, and the cover main body 16A is arranged above the second rectifying plate 26. Exhaust gas that has passed through the plate 26 does not interfere with the components of the automobile 12.
Furthermore, in the present embodiment, as shown in FIG. 2, a floor cover 28 is attached to the bottom of the rear part of the vehicle body 14 at the center in the vehicle width direction, and as shown in FIG. The rear end portion of the cover 28 and the lower end portion of the cover main body 16A are overlapped. A plurality of discharge holes 28A, which are elongated holes along the vehicle width direction, are formed in the rear end portion of the floor cover 28 on the front side of the vehicle body from the overlapped portion, and the cover body 16A and the lower back panel 14A are formed. Exhaust gas that has entered between the two is discharged downward from these discharge holes 28A (see arrow F in FIG. 13). A hole edge portion on the vehicle body rear side of each discharge hole 28A is an inclined portion 28B (rectifying means) inclined downward toward the vehicle body rear side, and the exhaust gas discharged from each discharge hole 28A is the vehicle body 14. Is caused to flow toward the inclined portion 28B by the wind pressure of the air flow U flowing under the floor. The exhaust gas flowed to the inclined portion 28B side is guided by the inclined portion 28B in a downwardly inclined direction toward the rear side of the vehicle body and merges with the air flow U (see arrow G in FIG. 13). ).
Note that traveling wind also enters between the cover main body 16A and the lower back panel 14A, but the entering traveling wind is inclined in a direction inclined downward toward the rear side of the vehicle body by the inclined portion 28B of each discharge hole 28A. It is guided to join the air flow U.
In the automobile 12 having the above-described configuration, exhaust gas discharged downward from between the front end portion of the diffuser 20 and the main body portion 18A of the muffler 18 is caused by the inclined portion 20D and the first guide portion 24A of the first rectifying plate 24. After being guided in a direction inclined downward toward the rear side of the vehicle body, the outer circumference 20E of the front end portion of the diffuser 20 and the second guide portion 24B of the first current plate 24 follow the air flow U flowing under the floor of the vehicle body 14. It is guided in the direction and merges with the air flow U. Therefore, the air flow U under the floor of the vehicle body 14 can be prevented from being disturbed by the exhaust gas discharged from between the front end portion of the diffuser 20 and the main body portion 18A of the muffler 18.
Further, the exhaust gas discharged downward from between the cover main body 16A and the lower back panel 14A is inclined downward toward the rear of the vehicle body by the first guide portion 26A of the second rectifying plate 26. After being guided, the second guide portion 26B of the second rectifying plate 26 guides in the direction along the air flow U flowing under the floor of the vehicle body 14 and joins the air flow U. Therefore, it is possible to suppress the air flow U under the floor of the vehicle body 14 from being disturbed by the exhaust gas discharged from between the cover main body 16A and the lower back panel 14A.
Further, the exhaust gas discharged from the discharge hole 28A of the floor cover 28 is guided in a direction inclined downward toward the rear side of the vehicle body by the inclined portion 28B provided at the hole edge of the discharge hole 28A. 14 is guided in a direction along the air flow U flowing under the floor 14 and joins the air flow U. Accordingly, it is possible to suppress the air flow U under the floor of the vehicle body 14 from being disturbed by the exhaust gas discharged from the discharge hole 28A of the floor cover 28.
Moreover, in the present embodiment, the exhaust gas can be guided by providing two guide portions on the first rectifying plate 24 and the second rectifying plate 26, so that the rectifying means can have a simple configuration.
In the above embodiment, the first rectifying plate 24 and the second rectifying plate 26 are provided with the first guide portions 24A and 26A and the second guide portions 24B and 26B and are formed in a bent cross-sectional shape. However, the present invention is not limited to this, and the rectifying plate may have a circular cross section. In this case, the rectifying plate is configured to guide the exhaust gas in a direction in which the exhaust gas is inclined toward the rear side of the vehicle body by the portion where the arc tangent is inclined.
In the above embodiment, the first rectifying plate 24 and the second rectifying plate 26 are formed separately from the diffuser 20 and the rear bumper cover 16, but the present invention is not limited thereto, and the first rectifying plate 24 is not limited thereto. May be formed integrally with the diffuser 20, and the second rectifying plate 26 may be formed integrally with the rear bumper cover 16.
1 is a side view of a rear portion of an automobile configured by applying an automobile rear structure according to an embodiment of the present invention. It is a bottom view of the rear part of the automobile shown in FIG. FIG. 2 is a front view showing the rear bumper cover of the automobile shown in FIG. 1 as viewed from the rear side of the vehicle body. FIG. 2 is a rear view showing the rear bumper cover of the automobile shown in FIG. 1 as viewed from the front side of the vehicle body. It is a perspective view which shows the structure of the diffuser attached to the rear bumper cover shown by FIG.3 and FIG.4. It is a perspective view which shows the structure of the diffuser attached to the rear bumper cover shown by FIG.3 and FIG.4. It is a perspective view which shows the structure of the diffuser attached to the rear bumper cover shown by FIG.3 and FIG.4. FIG. 8 is a sectional view taken along line 8-8 in FIG. 3. It is an expanded sectional view which shows the partial structure of the 1st baffle plate attached to the diffuser shown by FIG. It is a top view which shows the structure of the 2nd baffle plate attached to the rear bumper cover shown by FIG.3 and FIG.4. It is a side view which shows the structure of the 2nd baffle plate attached to the rear bumper cover shown by FIG.3 and FIG.4. FIG. 11 is a sectional view taken along line 11-11 in FIG. 3. FIG. 12 is a sectional view taken along line 12-12 of FIG.
DESCRIPTION OF SYMBOLS 12 Car 14 Car body 14A Lower back panel 16 Rear bumper cover 16A Cover main body 18 Muffler 18A Main body 18B Muffler pipe 20 Diffuser 20A Front end side opening 20B Rear end side opening 20D Inclined part (rectifying means)
20E outer circumference (rectifying means)
24 First rectifying plate (rectifying means)
24A 1st guide part 24B 2nd guide part 26 2nd baffle plate (rectifier means)
26A 1st guide part 26B 2nd guide part 28 Floor cover 28A Discharge hole 28B Inclined part (rectifying means)
A rear-side arrangement member disposed on the rear side of the muffler and interfering with exhaust gas exhausted from the muffler and directing a part of the exhaust gas downward;
Rectifying means provided on the lower side of the muffler, for guiding the exhaust gas directed downward to the direction of the air flow under the floor of the vehicle body and joining the air flow;
Automobile rear structure having
The rear arrangement member has a diffuser that is formed in a cylindrical shape, accommodates the muffler pipe of the muffler in an opening on the front end side, and discharges exhaust gas discharged from the muffler pipe from the opening on the rear end side. A part of the exhaust gas is discharged downward from between a front end portion of the diffuser and a main body portion of the muffler, and the rectifying means is provided at a lower portion of the front end portion of the diffuser. The automobile rear structure according to claim 1.
The rear arrangement member has a rear bumper cover, a part of the exhaust gas is discharged downward from between the rear bumper cover and the vehicle body, and the rectifying means is provided at a lower portion of the rear bumper cover. The rear structure of an automobile according to claim 1 or 2, characterized by the above.
The rear arrangement member has a rear bumper cover, and a floor cover having a rear end portion overlapping with a lower end portion of the rear bumper cover and a discharge hole formed on the rear end side is attached under the floor of the rear portion of the vehicle body, 4. A part of the exhaust gas is discharged downward from the discharge hole, and the rectifying means has an inclined portion provided at a hole edge of the discharge hole. The automobile rear structure according to any one of the above.
The rectifying means includes a rectifying plate including a first guide portion that is inclined downward toward the rear side of the vehicle body, and a second guide portion that extends from the lower end of the first guide portion toward the rear of the vehicle body. The automobile rear structure according to any one of claims 1 to 4, characterized in that
JP2006218252A 2006-08-10 2006-08-10 Car rear structure Expired - Fee Related JP4380670B2 (en)
JP2006218252A JP4380670B2 (en) 2006-08-10 2006-08-10 Car rear structure
US11/882,838 US7891452B2 (en) 2006-08-10 2007-08-06 Automobile rear structure
DE200710037599 DE102007037599B8 (en) 2006-08-10 2007-08-09 Rear construction of a motor vehicle
CN2007101357139A CN101121381B (en) 2006-08-10 2007-08-10 Automobile rear structure
JP2008037396A true JP2008037396A (en) 2008-02-21
JP4380670B2 JP4380670B2 (en) 2009-12-09
ID=39049985
JP2006218252A Expired - Fee Related JP4380670B2 (en) 2006-08-10 2006-08-10 Car rear structure
US (1) US7891452B2 (en)
JP (1) JP4380670B2 (en)
CN (1) CN101121381B (en)
DE (1) DE102007037599B8 (en)
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2006-08-10 JP JP2006218252A patent/JP4380670B2/en not_active Expired - Fee Related
2007-08-06 US US11/882,838 patent/US7891452B2/en active Active
2007-08-09 DE DE200710037599 patent/DE102007037599B8/en not_active Expired - Fee Related
2007-08-10 CN CN2007101357139A patent/CN101121381B/en active IP Right Grant
DE102007037599B4 (en) 2014-01-23
US7891452B2 (en) 2011-02-22
DE102007037599B8 (en) 2014-04-10
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