A passenger car and rear bumper assembly thereof

Abstract

The present invention relates to a bus and a rear bumper assembly thereof. The rear bumper assembly for a bus includes a rear bumper for forming a rear engine compartment with a door and a cabin, the rear bumper is provided with a leakage hole for connecting the inside and outside of the rear engine compartment, and the rear bumper is provided with a guide structure for guiding the air in the rear engine compartment toward a negative pressure area at the rear of the bus, or the leakage hole itself is provided with a guide structure for guiding the air in the rear engine compartment toward a negative pressure area at the rear of the bus. By providing the leakage hole on the rear bumper, the airflow in the rear engine compartment can be led out backward when the bus is running at high speed, thereby reducing the air pressure resistance caused by the airflow gathering in the rear engine compartment. Since a negative pressure area will be formed at the rear of the bus when the bus is running at high speed, the guide structure can guide the air in the rear engine compartment toward the direction of the negative pressure area, thereby increasing the air pressure value of the negative pressure area and reducing the negative pressure drag.

Description

Technical Field

[0001] The invention relates to a passenger car and a rear bumper assembly thereof. Background Art

[0002] As a means of transportation, buses are flexible and have a large passenger capacity. They are an important means to solve people's travel problems.

[0003] As buses are tall and have a straight shape, more than half of the fuel consumption is used to overcome aerodynamic resistance when driving at high speed (above 70km / h). Therefore, research on reducing aerodynamic resistance of buses is an important means to achieve energy conservation of buses. Usually, the engine compartment of a bus is located at the rear end of the bus, and the engine compartment is surrounded by the cabin on both sides, the rear door, and the rear bumper under the door.

[0004] The prior art method of reducing aerodynamic drag during bus driving is shown in a Chinese utility model patent with authorization announcement number CN203739999U. The Chinese utility model patent discloses a bus rear drag reduction structure, in which a rear spoiler is arranged at the rear of the bus body and can be opened automatically when the bus is driving at high speed. The rear spoiler can extend into the vortex generating area behind the bus to destroy the turbulent vortex in the vortex generating area and decompose the turbulent vortex into relatively small vortices, thereby reducing the turbulent loss caused by the large vortex and reducing the wind resistance of the whole vehicle.

[0005] The overall wind resistance can be reduced by installing a rear spoiler at the rear of the bus, but the overall structure is relatively complex, requiring a large cost investment, and also requiring a large installation space, which will also affect the rear spraying.

[0006] In the prior art, the wind resistance of the rear engine compartment is an important part of the wind resistance of the entire vehicle. When the bus is traveling at high speed, air enters the rear engine compartment from the chassis. Since the rear engine compartment is relatively closed, the air cannot pass through the rear engine compartment, resulting in increased resistance in the rear engine compartment. Summary of the invention

[0007] The purpose of the present invention is to provide a rear bumper assembly for a bus to reduce the wind resistance in a rear engine compartment; and also to provide a bus using the rear bumper assembly to reduce the wind resistance during the driving of the bus.

[0008] To achieve the above-mentioned purpose, the technical scheme of the rear bumper assembly for a bus of the present invention is: a rear bumper assembly for a bus, comprising a rear bumper for enclosing a rear engine compartment with a door and a cabin, the door is provided with a first leakage hole, the rear bumper is provided with a second leakage hole, the first leakage hole and the second leakage hole are both used to connect the inside and outside of the rear engine compartment, and both are long holes extending in the width direction of the bus, and the door is provided with a second leakage hole corresponding to the first leakage hole for guiding the air in the rear engine compartment toward the negative pressure area at the rear of the bus. A guide structure, wherein the first guide mechanism includes a first cover plate hinged on the inner side of a door, a driving mechanism for driving the first cover plate to reciprocate is installed on the inner side of the door, the first cover plate has a closed position for closing the first leakage hole in the swing stroke, the rear bumper is arranged corresponding to the second leakage hole or the second leakage hole itself has a second guide structure for guiding the air in the rear engine compartment toward the negative pressure area at the rear of the bus, the first cover plate guides the airflow to flow obliquely downward when in the non-closed position, and the second guide structure guides the airflow to flow obliquely upward.

[0009] The beneficial effect of the present invention is that, in the present invention, by providing a first leakage hole on the door and a second leakage hole on the rear bumper, the airflow in the rear engine compartment can be led out backward when the bus is running at high speed, thereby reducing the air pressure resistance caused by the airflow gathering in the rear engine compartment. Since a negative pressure area will be formed at the rear of the bus when the bus is running at high speed, the guide structure can guide the air in the rear engine compartment toward the direction of the negative pressure area, thereby increasing the air pressure value of the negative pressure area and reducing the negative pressure drag force. A leakage hole is opened on the rear bumper. Although external dust will enter the engine compartment, since the rear bumper is at the lowest point of the rear engine compartment, the dust will directly fall on the bottom of the rear engine compartment after entering, and will not cause excessive dust pollution to the engine. The first leakage hole and the second leakage hole are designed to be long holes extending along the width direction of the bus, which can increase the leakage area and prevent the airflow from staying in the rear engine compartment. The first cover plate can open or close the first leakage hole, which can keep the rear engine compartment warm when the bus is started and reduce wind resistance during the driving of the bus. When the first cover plate is in the non-closed position, it guides the airflow to flow diagonally downward, and the second guide structure guides the airflow to flow diagonally upward. The two airflows decelerate after colliding in the negative pressure area, which can better improve the pressure boosting effect on the negative pressure area.

[0010] Furthermore, at least two of the first leakage holes and the second leakage holes are arranged at intervals in the up-down direction.

[0011] Providing at least two first leakage holes and at least two second leakage holes can further increase the leakage area.

[0012] Furthermore, the deflector structure includes a deflector plate fixedly mounted on the rear bumper, and the deflector plate is arranged obliquely from inside to outside and from bottom to top.

[0013] The inclined arrangement of the guide plate can guide the airflow toward the negative pressure area, accelerate the flow of air, and the airflow flowing into the negative pressure area can also increase the pressure in the negative pressure area and reduce the negative pressure drag force during the driving of the bus.

[0014] Furthermore, the angle between the guide plate and the horizontal plane is 30-60°.

[0015] According to the simulation analysis, the specific inclination angle of the guide plate can be obtained to achieve the best effect.

[0016] Furthermore, the guide plate is arranged at the inner upper end edge of the second leakage hole.

[0017] Arranging the deflector on the inner side of the rear bumper can ensure the overall flatness of the rear of the bus and improve the overall aesthetics of the rear of the bus.

[0018] Furthermore, a horizontal projection of the deflector plate on the rear bumper covers the second leakage hole.

[0019] The horizontal projection of the deflector can completely cover the second leakage hole, and the internal structure of the rear engine compartment cannot be directly seen from the rear of the bus, thereby improving the overall aesthetics.

[0020] Furthermore, the second air guide structure includes a second cover plate hinged on the rear bumper, and the rear bumper is also provided with a driving mechanism for driving the second cover plate to reciprocate. The second cover plate has a closing position for closing the second leakage hole in a controlled swinging stroke, and also has an opening limit position for opening the second leakage hole. The controlled swinging stroke of the second cover plate is an adjustment stroke that can adjust the air ejection angle of the rear engine compartment.

[0021] The second cover plate can open or close the second leakage hole, which can keep the rear engine compartment warm when the bus is started and reduce wind resistance when the bus is traveling.

[0022] Furthermore, the angle between the second cover plate in the open limit position and the horizontal plane is 30-60°.

[0023] According to the simulation analysis, the opening limit position of the second cover can be obtained to achieve the best effect.

[0024] The technical solution of the bus of the present invention is: a bus, comprising a rear engine compartment surrounded by a door, a cabin and a rear bumper, the door is provided with a first leakage hole, the rear bumper is provided with a second leakage hole, the first leakage hole and the second leakage hole are both used to connect the inside and outside of the rear engine compartment, and both are long holes extending along the width direction of the bus, the door is provided with a first guide structure for guiding the air in the rear engine compartment toward the negative pressure area at the rear of the bus corresponding to the first leakage hole, the first guide mechanism includes a first cover plate hinged to the inner side of the door, a driving mechanism for driving the first cover plate to reciprocate is installed on the inner side of the door, the first cover plate has a closing position for closing the first leakage hole in the swing stroke, the rear bumper is provided with a second guide structure for guiding the air in the rear engine compartment toward the negative pressure area at the rear of the bus corresponding to the second leakage hole, or the second leakage hole itself has a second guide structure, the first cover plate guides the airflow to flow obliquely downward when in a non-closed position, and the second guide structure guides the airflow to flow obliquely upward.

[0025] The beneficial effect of the present invention is that, in the present invention, by providing a first leakage hole on the door and a second leakage hole on the rear bumper, the airflow in the rear engine compartment can be led out backward when the bus is running at high speed, thereby reducing the air pressure resistance caused by the airflow gathering in the rear engine compartment. Since a negative pressure area will be formed at the rear of the bus when the bus is running at high speed, the guide structure can guide the air in the rear engine compartment toward the direction of the negative pressure area, thereby increasing the air pressure value of the negative pressure area and reducing the negative pressure drag force. A leakage hole is opened on the rear bumper. Although external dust will enter the engine compartment, since the rear bumper is at the lowest point of the rear engine compartment, the dust will directly fall on the bottom of the rear engine compartment after entering, and will not cause excessive dust pollution to the engine. The first leakage hole and the second leakage hole are designed to be long holes extending along the width direction of the bus, which can increase the leakage area and prevent the airflow from staying in the rear engine compartment. The first cover plate can open or close the first leakage hole, which can keep the rear engine compartment warm when the bus is started and reduce wind resistance during the driving of the bus. When the first cover plate is in the non-closed position, it guides the airflow to flow diagonally downward, and the second guide structure guides the airflow to flow diagonally upward. The two airflows decelerate after colliding in the negative pressure area, which can better improve the pressure boosting effect on the negative pressure area.

[0026] Furthermore, at least two of the first leakage holes and the second leakage holes are arranged at intervals in the up-down direction.

[0027] Providing at least two first leakage holes and at least two second leakage holes can further increase the leakage area.

[0028] Furthermore, the deflector structure includes a deflector plate fixedly mounted on the rear bumper, and the deflector plate is arranged obliquely from inside to outside and from bottom to top.

[0029] The inclined arrangement of the guide plate can guide the airflow toward the negative pressure area, accelerate the flow of air, and the airflow flowing into the negative pressure area can also increase the pressure in the negative pressure area and reduce the negative pressure drag force during the driving of the bus.

[0030] Furthermore, the angle between the guide plate and the horizontal plane is 30-60°.

[0031] According to the simulation analysis, the specific inclination angle of the guide plate can be obtained to achieve the best effect.

[0032] Furthermore, the guide plate is arranged at the inner upper end edge of the second leakage hole.

[0033] Arranging the deflector on the inner side of the rear bumper can ensure the overall flatness of the rear of the bus and improve the overall aesthetics of the rear of the bus.

[0034] Furthermore, a horizontal projection of the deflector plate on the rear bumper covers the second leakage hole.

[0035] The horizontal projection of the deflector can completely cover the second leakage hole, and the internal structure of the rear engine compartment cannot be directly seen from the rear of the bus, thereby improving the overall aesthetics.

[0036] Furthermore, the guide structure includes a second cover plate hinged on the rear bumper, and the rear bumper is also provided with a driving mechanism for driving the second cover plate to reciprocate. The second cover plate has a closed position for closing the second leakage hole in a controlled swinging stroke, and also has an opening limit position for opening the second leakage hole. The controlled swinging stroke of the second cover plate is an adjustment stroke that can adjust the air ejection angle of the rear engine compartment.

[0037] The second cover plate can open or close the second leakage hole, which can keep the rear engine compartment warm when the bus is started and reduce wind resistance when the bus is traveling.

[0038] Furthermore, the angle between the second cover plate in the open limit position and the horizontal plane is 30-60°.

[0039] According to the simulation analysis, the opening limit position of the second cover can be obtained to achieve the best effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the rear engine compartment door in the first embodiment of the passenger car of the present invention;

[0041] Figure 2 for Figure 1 The cross-sectional view at A in the middle;

[0042] Figure 3 It is a schematic diagram of the inner side of the rear engine compartment door in the first embodiment of the passenger car of the present invention;

[0043] Figure 4 It is a schematic diagram of the rear bumper in the passenger car embodiment 1 of the present invention;

[0044] Figure 5 for Figure 4 Cross-sectional view of the drain hole in the center rear bumper.

[0045] In the attached drawings, 1-hatch; 2-hatch drain hole; 3-cover plate; 4-driving mechanism; 5-rear bumper; 6-rear bumper drain hole; 7-guide plate. DETAILED DESCRIPTION

[0046] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0047] Specific embodiment 1 of the passenger car of the present invention, as Figures 1 to 5 As shown, the engine compartment in the bus is rear-mounted. The rear-mounted engine compartment is formed by a cabin body, a door 1 at the rear, and a rear bumper 5 located below the door.

[0048] By simulating the condition of a bus driving at high speed, it can be concluded that the rear of the bus is mostly a negative pressure area when the bus is driving at high speed.

[0049] In order to reduce the wind resistance of the bus at high speed, the airflow in the rear engine compartment can be discharged in time to reduce the internal resistance of the rear engine compartment. Figure 1 and Figure 2 It can be seen that two door leakage holes 2 are arranged at intervals in the upper and lower directions on the door 1 of the rear engine compartment. The door leakage holes 2 are long holes extending in the width direction of the bus. The long holes can increase the flow area and avoid the airflow gathering on one side in the width direction of the bus. Among them, the door leakage holes 2 are generally opened in the middle of the door 1, preferably in the place with large negative pressure at the rear of the bus, and the best position is the area with the lowest pressure at the rear of the door. The door leakage holes 2 pass through the door 1 and connect the inside and outside of the rear engine compartment. The width b of the door leakage holes 2 in the upper and lower directions should be between 5-10 cm, and the spacing c between the two door leakage holes 2 should not be too small.

[0050] Depend on Figure 2 and Figure 3It can be seen that a cover plate 3 is also hinged on the inner side of the hatch 1, and the cover plate 3 is hinged at the inner upper end hole edge of the hatch drain hole 2. A driving mechanism 4 is also installed on the inner side of the hatch 1, and the driving mechanism 4 can drive the cover plate 3 to swing back and forth. Specifically, the driving mechanism 4 can be a rotating motor fixed on the hatch 1, and the rotating motor has two power output shafts. The two power output shafts are connected to the hinge shaft of the cover plate 3 through a bevel gear, and the two cover plates 3 can be driven to open and close at the same time by the rotating motor. Of course, in other embodiments, the driving mechanism 4 can also be other forms of mechanisms, such as the driving mechanism 4 can use a mechanism to drive the shutters to droop and swing up, etc. Of course, each driving mechanism 4 can only drive one cover plate 3 to rotate.

[0051] The driving mechanism 4 can drive the cover plate 3 to open the hatch door leakage hole 2, and can also close the hatch door leakage hole 2. When the cover plate 3 reaches the opening limit state, the angle d between the cover plate 3 and the horizontal plane is 30-60°, preferably 60°.

[0052] In the present invention, the hatch drain hole 2 is arranged in the negative pressure area. On the one hand, the negative pressure can guide the airflow in the rear engine compartment to flow out of the rear engine compartment smoothly; on the other hand, since the airflow is supplemented into the negative pressure area, the pressure in the negative pressure area increases, thereby reducing the dragging force on the entire vehicle.

[0053] In the present invention, when the cover plate 3 opens the hatch bleed hole 2, the cover plate can play a role in guiding the flow and form a guide structure, guiding the airflow to flow out smoothly and mix with the airflow at the rear of the bus at a certain angle, avoiding direct injection of the airflow and causing excessive interference with the rear airflow.

[0054] In the present invention, the swing of the cover plate is controlled by intelligent control. When the bus is stationary, the cover plate 3 can be closed to prevent dust from falling into the rear engine compartment. In winter, closing the cover plate 3 can reduce the convective heat exchange intensity in the rear engine compartment, improve the heat preservation capacity of the rear engine compartment, maintain the optimal working temperature of the engine, and enhance the heating effect.

[0055] In the present invention, each cover plate can be controlled individually, and the air resistance and engine water temperature requirements can be taken into account. For example, when starting a bus in winter, all cover plates 3 are closed to accelerate the engine warm-up; when the engine warm-up is completed, some cover plates 3 can be opened to take into account the water heating performance and the requirements for reducing the resistance of the whole vehicle. Specifically, a controller can be set in the vehicle to collect signals such as vehicle speed, water temperature, and water heating switch, and output the swing angle of the cover plate after comprehensive analysis, and the drive mechanism 4 controls the opening of the cover plate.

[0056] Depend on Figure 4 and Figure 5It can be seen that in order to further guide the airflow in the rear engine compartment, two rear bumper leakage holes 6 are arranged at intervals in the upper and lower directions on the rear bumper 5. The rear bumper leakage holes 6 are long holes extending along the width direction of the bus. A deflector 7 is also fixed on the inner side of the rear bumper 5. The deflector 7 is fixed at the inner upper hole edge of the rear bumper leakage hole 6. The angle between the deflector 7 and the horizontal plane is 30-60°, preferably 30°. The deflector 7 is arranged obliquely from the inside to the outside and from the bottom to the top. The rear bumper leakage hole 6 can guide the airflow in the rear engine compartment. The deflector 7 can guide the airflow to spray upward, spray to the negative pressure area at the rear of the bus, and reduce the negative pressure drag force. The height e of the rear bumper leakage hole 6 is generally 10-15 mm. Of course, in other embodiments, the height of the rear bumper leakage hole 6 and the number of the rear bumper leakage holes 6 can be increased or decreased according to actual conditions.

[0057] The extension length of the guide plate 7 or the cover plate 3 mentioned above exceeds the vertical height of the corresponding leakage hole, and the projection in the horizontal direction can cover the leakage hole, so that the engine cannot be directly seen from the outside, thereby enhancing the aesthetic effect.

[0058] In this embodiment, the guide plate 7 constitutes a guide structure for guiding the rear bumper leakage hole 6. In other embodiments, if the length of the rear bumper leakage hole 6 in the front-to-back direction is large enough, an additional guide structure may not be provided. In this case, the inner wall of the long hole of the rear bumper leakage hole constitutes the guide structure.

[0059] The specific embodiment 2 of the passenger car of the present invention is different from the embodiment 1 in that in the embodiment 1, since the rear bumper is arranged below the hatch, although dust will enter through the leakage hole of the rear bumper, the dust will directly fall on the bottom plate of the rear engine compartment, and will not cause significant dust pollution to the engine. However, in order to further prevent the engine from being polluted by dust, the diversion structure in this embodiment can be designed as a cover plate that can swing up and down, and a driving mechanism is further provided to drive the cover plate. The specific structure can refer to the various structures at the hatch of the engine compartment in the embodiment 1. The cover plate can close the leakage hole of the rear bumper and have a closed position, and can also open the leakage hole of the rear bumper and have an open limit position. When in the open limit position, the angle between the cover plate and the horizontal plane is 30-60°, preferably 30°. The swing stroke of the cover plate between the two positions is the adjustment stroke, which can adjust the angle of the air ejection.

[0060] The specific embodiment of the rear bumper assembly for a passenger car of the present invention comprises a rear bumper, a leakage hole is arranged on the rear bumper, and the rear bumper assembly also comprises a flow guide structure, the structure of which is consistent with that in the above embodiment, and its content is not repeated here.

Claims

1. A rear bumper assembly for a passenger car, comprising a rear bumper for forming a rear engine compartment with a door and a body, characterized in that: The hatch is provided with a first leakage hole, and the rear bumper is provided with a second leakage hole. The first leakage hole and the second leakage hole are both used to connect the inside and outside of the rear engine compartment and both are long holes extending along the width direction of the bus. The hatch is provided with a first guide structure corresponding to the first leakage hole for guiding the air in the rear engine compartment toward the negative pressure area at the rear of the bus. The first guide structure includes a first cover plate hinged on the inner side of the hatch, and a driving mechanism for driving the first cover plate to reciprocate is installed on the inner side of the hatch. The first cover plate has a closed position for closing the first leakage hole in the swing stroke. The rear bumper is provided with a second guide structure corresponding to the second leakage hole or the second leakage hole itself has a second guide structure for guiding the air in the rear engine compartment toward the negative pressure area at the rear of the bus. When the first cover plate is in a non-closed position, the airflow is guided to flow obliquely downward, and the second guide structure is guided to flow obliquely upward.

2. The rear bumper assembly for a passenger car according to claim 1, characterized in that: At least two of the first leakage holes and the second leakage holes are arranged at intervals in the up-down direction.

3. The rear bumper assembly for a passenger car according to claim 1 or 2, characterized in that: The second air guide structure comprises an air guide plate fixed on the rear bumper, and the air guide plate is arranged obliquely from inside to outside and from bottom to top.

4. The rear bumper assembly for a passenger car according to claim 3, characterized in that: The angle between the guide plate and the horizontal plane is 30-60°.

5. The rear bumper assembly for a passenger car according to claim 3, characterized in that: The guide plate is arranged at the inner upper end hole edge of the second leakage hole.

6. The rear bumper assembly for a passenger car according to claim 3, characterized in that: The horizontal projection of the deflector plate on the rear bumper covers the second leakage hole.

7. The rear bumper assembly for a passenger car according to claim 1 or 2, characterized in that: The second air guide structure includes a second cover plate hinged on the rear bumper. The rear bumper is also provided with a driving mechanism for driving the second cover plate to reciprocate. The second cover plate has a closing position for closing the second leakage hole in a controlled swinging stroke, and also has an opening limit position for opening the second leakage hole. The controlled swinging stroke of the second cover plate is an adjustment stroke that can adjust the air ejection angle of the rear engine compartment.

8. The rear bumper assembly for a passenger car according to claim 7, characterized in that: The angle between the second cover plate in the open limit position and the horizontal plane is 30-60°.

9. A passenger car, comprising a rear engine compartment formed by a door, a body and a rear bumper, characterized in that: The hatch is provided with a first leakage hole, and the rear bumper is provided with a second leakage hole. The first leakage hole and the second leakage hole are both used to connect the inside and outside of the rear engine compartment and both are long holes extending along the width direction of the bus. The hatch is provided with a first guide structure corresponding to the first leakage hole for guiding the air in the rear engine compartment toward the negative pressure area at the rear of the bus. The first guide structure includes a first cover plate hinged on the inner side of the hatch, and a driving mechanism for driving the first cover plate to reciprocate is installed on the inner side of the hatch. The first cover plate has a closed position for closing the first leakage hole in the swing stroke. The rear bumper is provided with a second guide structure corresponding to the second leakage hole or the second leakage hole itself has a second guide structure for guiding the air in the rear engine compartment toward the negative pressure area at the rear of the bus. When the first cover plate is in a non-closed position, the airflow is guided to flow obliquely downward, and the second guide structure is guided to flow obliquely upward.

10. The passenger car according to claim 9, characterized in that: At least two of the first leakage holes and the second leakage holes are arranged at intervals in the up-down direction.

11. The passenger car according to claim 9 or 10, characterized in that: The second air guide structure comprises an air guide plate fixed on the rear bumper, and the air guide plate is arranged obliquely from inside to outside and from bottom to top.

12. The passenger car according to claim 11, characterized in that: The angle between the guide plate and the horizontal plane is 30-60°.

13. The passenger car according to claim 11, characterized in that: The guide plate is arranged at the inner upper end hole edge of the second leakage hole.

14. The passenger car according to claim 11, characterized in that: The horizontal projection of the deflector plate on the rear bumper covers the second leakage hole.

15. The passenger car according to claim 9 or 10, characterized in that: The second air guide structure includes a second cover plate hinged on the rear bumper. The rear bumper is also provided with a driving mechanism for driving the second cover plate to reciprocate. The second cover plate has a closing position for closing the second leakage hole in a controlled swinging stroke, and also has an opening limit position for opening the second leakage hole. The controlled swinging stroke of the second cover plate is an adjustment stroke that can adjust the air ejection angle of the rear engine compartment.

16. The passenger car according to claim 15, characterized in that: The angle between the second cover plate in the open limit position and the horizontal plane is 30-60°.

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