CN113202610A - Front mudguard and motor vehicle - Google Patents

Abstract

The invention relates to a front fender and a motor vehicle. The front fender includes a roof main body in the shape of an arc groove. The roof main part includes the guide part, and the guide part is used for establishing in the contained angle within range between front fork central line and the perpendicular line through preceding wheel center perpendicular to ground. The guide part in the longitudinal section is in an arc shape with continuous curvature radius, and at least one tangent line passing through the outer surface of the guide part in the longitudinal section can penetrate through the air inlet of the cooling air duct of the engine cylinder head. Therefore, the flow velocity of the cooling air channel close to the wall surface can be improved, the heat convection of the outer surface of the top of the combustion chamber of the engine is enhanced, the heat load of the engine is reduced, and the engine can stably work within a proper temperature range. Besides, the front fender can guide the windward airflow into a cooling air duct of the engine and can enable the rest of the air to directly wash radiating fins on the side part of the engine. The front fender can not only increase the flow speed of a cooling air duct in the engine, but also cool the side part of the engine, and reduce the heat load of the engine.

Description

Front mudguard and motor vehicle

Technical Field

The invention relates to the technical field of engine cooling, in particular to a front fender and a motor vehicle.

Background

When the motor vehicle runs, the radiating fins of the engine cool the engine by capturing the windward airflow to carry out convective heat transfer. The engine is ensured to work at a reasonable temperature. If the thermal load of the engine is high, the mechanical property of engine parts is reduced, the thermal deformation is excessive, and the engine is unstable in operation. Further, the lubricating performance of the engine is also degraded. These increase the friction losses of the engine and ultimately the fuel consumption and emissions of the vehicle.

In order to reduce the fuel consumption and emissions of motor vehicles, the engine tends to be small and light, however, the small design requires that the cooling fins are not too large and the engine is strong, which increases the risk of high thermal load on the engine. In addition, the fuel consumption and the emission can be reduced by adopting a lean combustion mode, but one of the constraint conditions for restricting the lean combustion is high thermal load of an engine. Therefore, the high heat load caused by the method can improve oil consumption and increase emission, and the problems of oil consumption and emission of the engine cannot be fundamentally solved.

Disclosure of Invention

Therefore, the front mudguard and the motor vehicle are needed to be provided, the convection heat exchange of the engine is enhanced, the heat load of the engine is reduced, and the oil consumption and the emission of the engine are effectively reduced.

A front fender comprising:

arc slot-shaped's roof main part, the roof main part includes the guide part, the guide part is arranged in establishing at the front fork central line and through the contained angle within range between the perpendicular of front wheel center perpendicular to ground, in the longitudinal section the guide part is the continuous arc of curvature radius, and in the process longitudinal section at least one tangent line of guide part surface can run through to the air intake of the cooling air duct of engine cylinder head.

The mudguard can be applied to the motor vehicle, and particularly, the front mudguard is arranged above the front wheel of the motor vehicle. In the advancing process, the windward airflow can enter the cooling air duct of the engine under the guidance of the guide part, the flow velocity of the cooling air duct close to the wall surface is improved, the convective heat transfer of the outer surface of the top of the combustion chamber of the engine is enhanced, the heat load of the engine is reduced, and the engine can work stably within a proper temperature range. Besides, the front fender can guide the windward airflow into a cooling air duct of the engine, and can enable the rest of the air to directly flush the radiating fins on the side part of the engine, so that the airflow and the radiating fins exchange heat. Therefore, the front fender can increase the flow speed of a cooling air channel inside the engine, and can cool the side part of the engine, so that the heat load of the engine is effectively reduced, the engine works at the optimal temperature, the thermal deformation of parts is small, the working temperature of lubricating oil is proper, the friction loss of the engine is favorably reduced, and the oil consumption and the emission of the whole vehicle are favorably reduced. In addition, because the guide part in the longitudinal section is in an arc shape with continuous curvature radius, the guide part can control the position of a separation point of the outer surface of the front fender along which the windward airflow flows, so that the windward airflow is guided by the front fender to just flush the cylinder head and the cylinder body with the highest engine thermal load.

In one embodiment, the head plate main body is provided with a first cross section and a second cross section, the first cross section is a plane passing through a vertical line perpendicular to the ground through the center of the front wheel and the axis of the front wheel, and the second cross section is a plane passing through the center line of the front fork and the axis of the front wheel; the intersection line of the first cross section and the outer surface of the top plate main body is a first contour line, the intersection line of the second cross section and the outer surface of the top plate main body is a second contour line, and the curvature radius of the first contour line and the curvature radius of the second contour line are continuous.

In one embodiment, the highest point of the top plate main body is the highest point of the first contour line in the direction of the perpendicular line of the center of the front wheel perpendicular to the ground.

In one embodiment, the radius of curvature of the outer contour of the guide portion transverse section is continuous.

In one embodiment, the top plate body is symmetrically disposed on both sides.

In one embodiment, the front fender further comprises side plate main bodies installed at both sides of the top plate main body; the top plate main body is streamline, and the side plate main body is streamline.

A motor vehicle comprises a frame, a front fork, wheels, an engine and a front mudguard, wherein the wheels comprise front wheels which are rotatably supported on the front part of the frame through the front fork; the engine is fixed in the frame, the engine is equipped with the cooling duct, preceding fender install in the top of preceding wheel, the guide part of preceding fender can be with windward air current guide to the air intake of cooling duct.

In one embodiment, the tangent line passing through the outer surface of the guide portion in the longitudinal section includes at least a first tangent line and a second tangent line, the first tangent line is perpendicular to a perpendicular line passing through the center of the front wheel and perpendicular to the ground, and the second tangent line is perpendicular to the center line of the front fork of the frame; and the air inlet of the cooling air duct is positioned in the included angle range between the first tangent line and the second tangent line.

In one embodiment, the position where the first tangent line is tangent to the guide portion is a first tangent point, and an upper edge of the air inlet is located below the first tangent point in a direction perpendicular to a vertical line passing through the center of the front wheel and perpendicular to the ground.

In one embodiment, the position where the second tangent line is tangent to the guide portion is a second tangent point, and the lower edge of the air inlet is located above the second tangent point in the direction of the center line of the front fork.

In the process of advancing, the windward airflow can enter the cooling air duct of the engine under the guidance of the guide part, so that the flow velocity of the cooling air duct close to the wall surface is improved, the convective heat transfer of the outer surface of the top of the combustion chamber of the engine is enhanced, the heat load of the engine is reduced, and the engine can work stably within a proper temperature range. Besides, the front fender can guide the windward airflow into a cooling air duct of the engine, and can enable the rest of the air to directly flush the radiating fins on the side part of the engine, so that the airflow and the radiating fins exchange heat. Therefore, the front fender can increase the flow speed of a cooling air channel inside the engine, and can cool the side part of the engine, so that the heat load of the engine is effectively reduced, the engine works at the optimal temperature, the thermal deformation of parts is small, the working temperature of lubricating oil is proper, the friction loss of the engine is favorably reduced, and the oil consumption and the emission of the whole vehicle are favorably reduced. In addition, because the guide part in the longitudinal section is in an arc shape with continuous curvature radius, the guide part can control the position of a separation point of the outer surface of the front fender along which the windward airflow flows, so that the windward airflow is guided by the front fender to just flush the cylinder head and the cylinder body with the highest engine thermal load.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a front fender according to an embodiment of the invention;

FIG. 2 is a layout view of a front fender and an engine according to an embodiment of the invention;

FIG. 3 is a bar graph illustrating the effect of a front fender on the near wall flow rate of an engine cylinder head in accordance with an embodiment of the present invention;

FIG. 4 is a cross-sectional flow field distribution diagram of a motor vehicle under the action of a fender before modification;

FIG. 5 is a cross-sectional flow field distribution diagram of a motor vehicle under an improved fender action in accordance with an embodiment of the present invention.

The reference numbers illustrate: 10. a front fender; 11. a top plate main body; 111. a guide portion; 12. a side plate main body; 20. a front fork; 30. a front wheel; 40. an engine; 41. and an air inlet.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1 and 2, fig. 1 is a schematic structural view illustrating a front fender according to an embodiment of the present invention, and fig. 2 is a layout view illustrating the front fender and an engine according to an embodiment of the present invention. The front fender of an embodiment of the present invention includes a top plate body 11 having an arc-groove shape. The head plate main body 11 includes a guide portion 111, and the guide portion 111 is provided within an angle between a center line of the front fork 20 and a vertical line perpendicular to the ground through a center of the front wheel 30. The guide portion 111 in the longitudinal section is an arc with a continuous curvature radius, and at least one tangent line passing through the outer surface of the guide portion 111 in the longitudinal section can penetrate to the air inlet 41 of the cooling air duct of the cylinder head of the engine 40.

Referring to fig. 1 and 2, for the sake of easy understanding, OA represents a vertical line perpendicular to the ground through the center of the front wheel 30, and OB represents a center line of the front fork 20. Also, an angle between the center line of the front fork 20 and a perpendicular line perpendicular to the ground through the center of the front wheel 30, that is, an angle between OA and OB is represented by θ. The longitudinal section line of the guide portion 111 is denoted by a-a.

The continuous radius of curvature of the guide portion 111 in the longitudinal section means that the change in the radius of curvature of the guide portion 111 in the longitudinal section is continuous and does not have a sudden change.

Referring to fig. 2 to 5, the front fender can be applied to a motor vehicle, and particularly, the front fender 10 is installed above a front wheel 30 of the motor vehicle. In the process of advancing, the windward airflow can enter the cooling air duct of the engine 40 under the guidance of the guide part 111, the flow velocity of the cooling air duct close to the wall surface is improved, the heat convection of the outer surface of the top of the combustion chamber of the engine 40 is enhanced, the heat load of the engine 40 is reduced, and the engine 40 can work stably in a proper temperature range. In addition, the front fender 10 can direct the rest of the air to flush the heat dissipation fins on the side of the engine 40, so that the air and the heat dissipation fins exchange heat, in addition to guiding the windward air flow into the cooling air duct of the engine 40. Therefore, the front fender 10 can not only increase the flow speed of the cooling air duct inside the engine 40, but also cool the side part of the engine 40, effectively reduce the heat load of the engine 40, so that the engine 40 works at the optimal temperature, the thermal deformation of parts is small, the working temperature of lubricating oil is proper, and the friction loss of the engine 40 is favorably reduced, thereby being favorable for reducing the oil consumption and emission of the whole vehicle. In addition, because the guide part 111 in the longitudinal section is in an arc shape with a continuous curvature radius, the guide part 111 can control the position of a separation point of the windward airflow around the outer surface of the front fender 10, so that the windward airflow just washes the cylinder head and the cylinder block with the highest heat load of the engine 40 under the guidance of the front fender 10.

Through research, under different vehicle speeds, when the front mudguard 10 is disturbed by the windward airflow, the separation points of the air separated from the outer surface of the roof main body 11 are different. Considering that the motor vehicle travels straight and without crosswind and travels at different speeds, the embodiment is limited in the range between the center line of the front fork 20 and the perpendicular line perpendicular to the ground through the center of the front wheel 30, and the roof main body 11 in the longitudinal section is an arc with a continuous curvature radius, so that the airflow can be guided to wash the cylinder head of the engine 40 obliquely downwards, and the good flow guiding effect of adapting to different traveling speed conditions is facilitated. Specifically, when the vehicle traveling speed is high, a point upstream of the guide portion 111 is separated; when the traveling vehicle speed decreases, the separation point of the gas gradually delays and advances downstream of the guide portion 111. Therefore, the front fender 10 can be guaranteed to have a good flow guiding effect under different running speed working conditions.

Note that, the upstream and downstream of the guide portion 111 are defined with respect to the flow direction of the windward airflow during the travel of the motor vehicle.

Referring to fig. 1 and 2, in the process of riding the motor vehicle, in addition to the working conditions of straight running and no crosswind, the working conditions of turning and crosswind need to be considered. Therefore, in order to capture the windward airflow by the engine 40 under various operating conditions and avoid premature separation of the air passing through the front fender 10, the transverse cross section of the front fender 10 is defined below. Wherein, for the convenience of understanding, the transverse section line of the front fender is represented by B-B.

In one embodiment, referring to fig. 1 and 2, the top plate body 11 is provided with a first cross section and a second cross section. The first cross-section is a plane passing through a perpendicular line perpendicular to the ground at the center of the front wheel 30 and the axis of the front wheel 30, and the second cross-section is a plane passing through the center line of the front fork 20 and the axis of the front wheel 30. The intersection line of the first cross section and the outer surface of the top plate main body 11 is a first contour line, the intersection line of the second cross section and the outer surface of the top plate main body 11 is a second contour line, and the curvature radius of the first contour line and the curvature radius of the second contour line are continuous. Therefore, under the working conditions of turning and crosswind of the motor vehicle, the engine 40 can capture windward airflow, premature separation of the airflow passing through the front fender 10 is avoided, and meanwhile, the airflow is guided to obliquely brush the cylinder head of the engine 40 downwards, and the good flow guiding effect of adapting to different running speed working conditions is facilitated.

Further, referring to fig. 1 and 2, the highest point of the top plate main body 11 is the highest point of the first contour line in the direction perpendicular to the vertical line of the center of the front wheel 30. Further, both sides of the top plate main body 11 are symmetrically arranged.

In one embodiment, referring to fig. 1 and 2, the radius of curvature of the outer contour of the guide 111 in the transverse section is continuous. Therefore, under the working conditions of turning and crosswind of the motor vehicle, the engine 40 can capture windward airflow, premature separation of the airflow passing through the front fender 10 is avoided, and meanwhile, the airflow is guided to obliquely brush the cylinder head of the engine 40 downwards, and the good flow guiding effect of adapting to different running speed working conditions is facilitated.

In one embodiment, referring to fig. 1 and 2, the front fender 10 further includes a side plate body 12, and the side plate body 12 is installed at both sides of the roof plate body 11. Thus, by providing the side plate main body 12, the molding need is considered on the one hand, and on the other hand, the front fender 10 is facilitated to achieve a better mud-blocking effect.

Alternatively, the radius of curvature of the side plate body 12 both upstream and downstream is less than the radius of curvature of the side plate body 12 within the range of the angle between the center line of the front fork 20 and the perpendicular to the ground through the center of the front wheel 30. Wherein, the upstream and the downstream of the lateral plate main body 12 are defined with respect to the flowing direction of the windward airflow during the traveling of the motor vehicle.

In one embodiment, referring to fig. 1, the front fender 10 is streamlined. Specifically, the top plate body 11 is streamlined, and the side plate body 12 is streamlined. Thus, the front mudguard 10 is streamline, so that the appearance of the vehicle is not influenced, and the running resistance of the whole vehicle can be reduced.

Referring to fig. 1 and 2, a motor vehicle according to an embodiment of the present invention includes a frame, a front fork 20, a wheel, an engine 40, and a front fender 10 according to any one of the embodiments. The wheels include a front wheel 30, and the front wheel 30 is rotatably supported to the front portion of the frame by a front fork 20. The engine 40 is fixed to the frame, and the engine 40 is provided with a cooling air duct. The front fender 10 is mounted above the front wheel 30, and the guide portion 111 of the front fender 10 can guide the windward airflow to the air inlet of the cooling air duct.

In the present embodiment, the motor vehicle is in particular a motorcycle.

In the process of traveling of the motor vehicle, the windward airflow can enter the cooling air duct of the engine 40 under the guidance of the guide part 111, so that the flow velocity of the cooling air duct close to the wall surface is improved, the convective heat transfer of the outer surface of the top of the combustion chamber of the engine 40 is enhanced, the heat load of the engine 40 is reduced, and the engine 40 can work stably in a proper temperature range. In addition, the front fender 10 can direct the rest of the air to flush the heat dissipation fins on the side of the engine 40, so that the air and the heat dissipation fins exchange heat, in addition to guiding the windward air flow into the cooling air duct of the engine 40. Therefore, the front fender 10 can not only increase the flow speed of the cooling air duct inside the engine 40, but also cool the side part of the engine 40, effectively reduce the heat load of the engine 40, so that the engine 40 works at the optimal temperature, the thermal deformation of parts is small, the working temperature of lubricating oil is proper, and the friction loss of the engine 40 is favorably reduced, thereby being favorable for reducing the oil consumption and emission of the whole vehicle. In addition, because the guide part 111 in the longitudinal section is in an arc shape with a continuous curvature radius, the guide part 111 can control the position of a separation point of the windward airflow around the outer surface of the front fender 10, so that the windward airflow just washes the cylinder head and the cylinder block with the highest heat load of the engine 40 under the guidance of the front fender 10.

In one embodiment, referring to fig. 1 and 2, the tangent lines passing through the outer surface of the guide portion 111 include at least a first tangent line and a second tangent line. The first tangent is perpendicular to a vertical line through the center of the front wheel 30 to the ground and the second tangent is perpendicular to the center line of the front fork 20. The air inlet 41 of the cooling air duct is located in the included angle range between the first tangent line and the second tangent line. Specifically, for ease of understanding, OC is used to denote a first tangent line and OD denotes a second tangent line. Therefore, the mounting height of the front fender corresponds to the position of the air inlet of the engine cooling air duct, so that in the advancing process of the motor vehicle, windward airflow can enter the cooling air duct of the engine 40 under the guidance of the front fender 10, the flow speed of the cooling air duct close to the wall surface is improved, the convection heat transfer of the outer surface of the top of the combustion chamber of the engine 40 is enhanced, the heat load of the engine 40 is reduced, and the engine 40 can work stably within a proper temperature range.

Further, referring to fig. 1 and 2, a position where the first tangent line is tangent to the guide portion 111 is a first tangent point, and an upper edge of the intake port 41 is located below the first tangent point in a direction perpendicular to a vertical line passing through a center of the front wheel 30 and perpendicular to the ground. Specifically, for ease of understanding, P is used to denote the first tangent point. Therefore, in the process of moving the motor vehicle, the front fender 10 is used for guiding the windward airflow into the cooling air duct of the engine 40, the heat convection of the outer surface of the top of the combustion chamber of the engine 40 is enhanced, and the heat load of the engine 40 is reduced.

Further, referring to fig. 1 and 2, the position where the second tangent line is tangent to the guide portion 111 is a second tangent point, and the lower edge of the air inlet 41 is located above the second tangent point in the direction of the center line of the front fork 20. Specifically, for ease of understanding, Q is used to denote the second tangent point. Therefore, in the process of moving the motor vehicle, the front fender 10 is used for guiding the windward airflow into the cooling air duct of the engine 40, the heat convection of the outer surface of the top of the combustion chamber of the engine 40 is enhanced, and the heat load of the engine 40 is reduced.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The front mudguard is characterized by comprising an arc-groove-shaped top plate main body, wherein the top plate main body comprises a guide part, the guide part is used for being arranged in an included angle range between a center line of a front fork and a perpendicular line perpendicular to the ground through the center of a front wheel, the guide part in a longitudinal section is arc-shaped with continuous curvature radius, and at least one tangent line passing through the outer surface of the guide part in the longitudinal section can penetrate through an air inlet of a cooling air duct of an engine cylinder head.

2. The front fender of claim 1, wherein the top plate body is provided with a first cross section and a second cross section, the first cross section being a plane for passing through a perpendicular line to the ground through a center of the front wheel and an axis of the front wheel, the second cross section being a plane for passing through a center line of the front fork and the axis of the front wheel; the intersection line of the first cross section and the outer surface of the top plate main body is a first contour line, the intersection line of the second cross section and the outer surface of the top plate main body is a second contour line, and the curvature radius of the first contour line and the curvature radius of the second contour line are continuous.

3. The front fender of claim 2, wherein the highest point of the top board main body is the highest point of the first contour line in a direction perpendicular to a vertical line of the center of the front wheel with respect to the ground.

4. The front fender of claim 1, wherein the guide portion transverse cross-section outer contour line has a continuous radius of curvature.

5. The front fender of claim 1, wherein the roof body is symmetrically disposed on both sides.

6. The front fender of claim 1, further comprising side plate bodies mounted on both sides of the top plate body; the top plate main body is streamline, and the side plate main body is streamline.

7. A motor vehicle comprising a frame, a front fork, a wheel including a front wheel rotatably supported at a front portion of the frame by the front fork, an engine, and the front fender according to any one of claims 1 to 6; the engine is fixed in the frame, the engine is equipped with the cooling duct, preceding fender install in the top of preceding wheel, the guide part of preceding fender can be with windward air current guide to the air intake of cooling duct.

8. The motor vehicle of claim 7, wherein a tangent to the outer surface of the pilot portion in a longitudinal cross-section includes at least a first tangent and a second tangent, the first tangent being perpendicular to a perpendicular to the ground through a center of the front wheel, the second tangent being perpendicular to a centerline of the front fork; and the air inlet of the cooling air duct is positioned in the included angle range between the first tangent line and the second tangent line.

9. The motor vehicle of claim 8, wherein the first tangent line is tangent to the guide portion at a first tangent point, and an upper edge of the air inlet is located below the first tangent point in a direction perpendicular to a vertical line of the ground through a center of the front wheel.

10. The motor vehicle of claim 8, wherein the position at which the second tangent line is tangent to the guide portion is a second tangent point, and the lower edge of the air inlet is located above the second tangent point in the direction of the center line of the front fork.

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