JP2017132350A - Air resistance reducing member of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air resistance reducing member of a vehicle capable of reducing air resistance during travel.SOLUTION: An air resistance reducing member 20 of a vehicle includes: a fitting part 21 that is attached to drive members 52, 60 which rotate as a vehicle travels; and a floating rotation part 22 which is supported by the fitting part 21 by being independent of the fitting part 21 for free rotation, and is driven to rotate, coaxially with the drive members 52, 60 in the same direction, according to fluid movement present between the drive members 52, 60 and an immobile member 80 as a vehicle 100 travels, with one end of the floating rotation part 22 facing the immobile member 80.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle air resistance reducing member.

In order to reduce the air resistance when the vehicle travels, a technique for changing the shape of wheels and tires provided in the vehicle is known.
Moreover, in order to suppress the resistance of fluid, the structure which suppresses power loss by attaching the member rotated coaxially with a rotating shaft is known (refer patent document 1 etc.).

However, such a shape of the wheel or tire has a great influence on the overall appearance of the vehicle, and also affects the operational stability and braking performance, so that there is a limit to a large change.
On the other hand, although there is a relatively large space inside the wheel, particularly between the drive shaft and the wheel, it has not been used so far to reduce air resistance.

JP 2004-162559 A

  The present invention has been made based on the above problems, and an object thereof is to provide a vehicle air resistance reducing member that reduces air resistance during traveling.

  An air resistance reducing member for a vehicle according to the present invention is attached to a mounting member attached to a drive member that rotates as the vehicle travels, and is supported by the mounting member so as to be freely rotatable independently of the mounting member. A floating rotating part that is driven to rotate in the same direction coaxially with the driving member in accordance with the movement of a fluid between the stationary member and the driving member that does not move as the vehicle travels, and one end of the floating rotating part is It is opposed to the immovable member.

  ADVANTAGE OF THE INVENTION According to this invention, the air resistance reduction member of the vehicle which reduces the air resistance at the time of driving | running | working can be provided.

1 is an example of an overall configuration diagram of a vehicle as a first embodiment of the present invention. It is sectional drawing which shows an example of a structure of the air resistance reduction member shown in FIG. FIG. 3 is a side view of the air resistance reducing member shown in FIG. 2. It is a schematic diagram which shows an example of operation | movement of the air resistance reduction member shown in FIG. It is a figure which shows an example of a structure of the air resistance reduction member concerning the 2nd Embodiment of this invention. It is a figure which shows an example of a structure of the air resistance reduction member concerning the 3rd Embodiment of this invention.

Hereinafter, a vehicle 100 having the air resistance reducing member shown in FIG. 1 will be described as a first embodiment of the present invention. In FIG. 1, the vehicle width direction of the vehicle 100 is defined as the Y direction, the longitudinal direction is defined as the X direction, and the vertical direction perpendicular to the X direction and the Y direction is defined as the Z direction.
The vehicle 100 includes an engine 300 as a drive source, four tires 50 arranged below the vehicle 100 to support the vehicle 100, a wheel 51 that supports the tire 50 from the inside, and power from the engine 300 to the tire 50. And an axle 60 for transmitting to the vehicle.
The vehicle 100 includes a hydraulic brake 10 that is a friction braking force generator that generates friction braking force by applying friction to the tire 50 or the axle 60, and a transmission 49 that transmits the driving force generated by the engine 300 to the axle 60. Have.
The vehicle 100 is disposed on the front end side of the axle 60 relative to the hydraulic brake 10, a hub 52 that connects the wheel 51 and the axle 60, a suspension 80 that is attached to the periphery of the axle 60 and reduces vibration of the vehicle 100, have.

Here, it is assumed that the axle 60, the wheel 51, and the hub 52 are driving members that are rotationally driven as the vehicle 100 travels, and the suspension 80 and the like are stationary members that do not move as the vehicle 100 travels.
As shown in FIG. 2, the vehicle 100 is an air resistance reducing member that is attached to the inside of the wheel 51 and reduces air resistance generated between a driving member such as a tire 50 and a stationary member such as a suspension 80. A resistance reduction unit 20 is provided.

  The engine 300 is an internal combustion engine that extracts fuel combustion energy as rotational kinetic energy, and transmits power to the axle 60 via the transmission 49.

  Two axles 60 are installed side by side in the X direction, which is the front-rear direction of the vehicle 100, and are drive shafts extending in the Y direction, which is the vehicle width direction of the vehicle 100. It is a drive member which performs rotational movement to.

The tire 50 is a hollow rubber tire. The tire 50 is filled with air of a predetermined pressure. The tire 50 is supported by a wheel 51 that is in contact with the inner peripheral side of the tire 50.
The tire 50 is a tubeless tire that keeps the air pressure constant by holding the air by the tire 50 itself, and is formed so that the air in the tire 50 is not leaked to the outside by the wheel 51 coming into contact with and closing the inner peripheral side. Has been.
Note that the tire 50 may be a so-called tube-type tire in which, for example, a hollow tube is filled with air and held in the tire 50.

The hydraulic brake 10 includes a disc-shaped brake disc 11 and a brake caliper 12 formed so as to surround at least a part of the brake disc 11.
The hydraulic brake 10 is a braking device that performs braking by frictional force when a brake pad is pressed from a stationary brake caliper 12 against a brake disc 11 that rotates integrally with the hub 52.

Two resistance reduction portions 20 are provided for each tire 50, and are respectively supported by a bearing 21 as an attachment portion attached to the hub 52, and attached to the bearing 21 so as to freely rotate with respect to the hub 52. And a floating rotation unit 22.
Each resistance reduction part 20 can be rotated independently of each other.
Each floating rotating part 22 is attached with a bearing 21, a mounting surface 22 a parallel to the X direction, a resistance suppression surface 22 b that rises from the mounting surface 22 a and is formed parallel to the Y direction, and a mounting surface of the resistance suppression surface 22 b. An end 22c opposite to the end 22a has a flange 22c extending in parallel to the X direction.
As illustrated in FIG. 3, the resistance reduction unit 20 includes an opening 23 formed in the attachment surface 22 a and a connecting portion 24 that connects the inner side and the outer side of the outer diameter direction of the opening 23. .

When the connecting portion 24 rotates in the A direction that rotates when the vehicle 100 travels in the X direction, the air in the wheel 51 is discharged from the inside to the outside in the vehicle width direction, that is, the -Y direction in FIG. It is inclined in the direction of discharging to
That is, when the connecting portion 24 is driven and rotated with respect to the hub 52 as will be described later, the air inside the wheel 51 is discharged to the outside of the vehicle 100 through the opening 23, so that the hydraulic pressure is reduced while reducing the air resistance. The cooling effect of the brake 10 is not impaired. Further, as shown in FIG. 3, by forming the opening 23 on the inner side in the outer diameter direction of the mounting surface 22a, it is possible to further contribute to the reduction of the air resistance of the vehicle and the improvement of the cooling effect of the hydraulic brake 10. Can do.

In the present embodiment, the vehicle 100 includes two resistance reduction units 20, but the configuration is the same, and thus the description thereof is omitted. When it is necessary to distinguish between the two resistance reduction units 20, the side away from the axle 60 in the outer diameter direction is particularly designated as the outer resistance reduction unit 20a, and the side closer to the rotation center is particularly designated as the inner resistance reduction unit 20b. .
The resistance reduction unit 20 is preferably formed of a metal material such as a high-tensile steel material (high-tensile material) or aluminum alloy having a thickness of about 2 mm to 3 mm, or a resin material such as PP or ABS in order to reduce weight. .
Further, the outer resistance reducing portion 20a on the side close to the tire 50 is preferably made of a highly rigid metal material because the rotational speed is high, and the inner resistance reducing portion 20b is reduced in weight because the rotational speed is smaller than that of the outer resistance reducing portion 20a. Therefore, a resin material is preferable.

Since each floating rotating part 22 is supported by the bearing 21, the rotation is directly separated even when driving members such as the wheel 51, the hub 52, and the axle 60 are rotated by traveling of the vehicle 100.
However, it is known that the rotation of the driving member causes a movement of air as a fluid in the B direction, that is, an air flow, in the wheel 51 when the traveling direction of the vehicle 100 is the X direction. In accordance with the airflow, a rotational movement in the same direction as the rotation of the driving member such as the wheel 51, the hub 52, and the axle 60 is also induced in the floating rotation unit 22.
In other words, the floating rotating part 22 is driven to rotate coaxially and in the same direction as the driving member in accordance with the airflow generated between the driving member and the non-moving member.
As will be described later, the floating rotating portion 22 is driven to rotate coaxially with the hub 52 in the same direction, thereby reducing the air resistance of the vehicle 100.

In the present embodiment, the resistance suppressing surface 22b is formed on a surface parallel to the Y direction.
However, the present invention is not limited to this configuration, and the resistance suppression surface 22b is preferably formed so as to be parallel to the inner wall surface of the wheel 51 in order to enhance the air resistance reduction effect described later.

The effect of reducing the air resistance of the resistance reducing unit 20 will be described in detail.
When the wheel 51 rotates, a driving member such as the wheel 51, the hub 52, and the axle 60 that rotates at an arbitrary angular velocity ω, and a stationary member such as the brake caliper 12 and the suspension 80 that are not rotating (that is, ω = 0) Air resistance occurs between the two.
It is known that such air resistance increases in proportion to the square of the flow velocity difference of flowing air.

Such air resistance acts in the −B direction, that is, the direction in which the rotation of the wheel 51 is hindered, and thus becomes a running resistance to the running of the vehicle 100.
Therefore, in order to reduce such air resistance, a method of controlling by the shape of the wheel 51 or the shape of the tire 50 can be considered, but there is a limit to the improvement.
Further, since the hydraulic brake 10 generates frictional heat during operation, the cooling effect due to the air flow toward the outside in the Y direction is large, and it is difficult to reduce the flow velocity without hindering the air flow in the Y direction. .

Therefore, in the present embodiment, in order to reduce the air resistance, the resistance reducing unit 20 is attached to the hub 52 and supported so as to freely rotate.
Consider the case where the rotation of the wheel 51 generates an air flow having a flow velocity v _{1 in} the B direction that is the same as the rotation direction of the wheel 51.
At this time, as shown by the upper half in FIG. 4, fast flow velocity v ₁ in terms of the -X side of the resistance suppressing surface 22b, is slower flow speed v ₂ is a surface opposite to the + X side, the floating rotating portion 22 The force to rotate in the B direction works.
That is, the outer resistance reduction unit 20a rotates in the B direction. The rotational speed ω _a of the outer resistance reduction unit 20a does not become faster than the rotational speed ω of the wheel 51, and always satisfies ω> ω _a .

Considering next the inner resistance reducing portion 20b, as before, at the front and back surfaces of the resistance suppressing surface 22b of the inner resistance reducing portion 20b, occurs airflow velocity v ₂ in terms of the -X side, the + X side surface in airflow velocity v ₃ is generated. Fast flow speed v ₂ in the -X side face of the resistance suppressing surface 22b, is slower flow velocity v ₃ is the opposite side of the + X side, the force for rotating the floating rotating portion 22 in the direction B acts.
The rotation speed ω _b of the inner resistance reduction unit 20b is never higher than the rotation speed ω _a of the outer resistance reduction unit 20a, and always satisfies ω _a > ω _b .
As described above, the air resistance increases in proportion to the square of the flow velocity difference between the flowing air and the object. Thus, by providing the outer resistance reducing portion 20a and the inner resistance reducing portion 20b in this way, the flow velocity is increased. As a result of suppressing the difference, air resistance is reduced.

In the present embodiment, the bearing 21 attached to the hub 52 and a floating rotation that is supported by the bearing 21 so as to be freely rotatable independently of the bearing 21 and is driven to rotate in the same direction coaxially with the hub 52 according to the movement of air. Part 22.
With this configuration, since the floating rotating part 22 rotates due to the air flow, the air resistance is reduced.

Further, in the present embodiment, when the vehicle 100 rotates in the A direction that rotates when traveling in the X direction, the connecting portion 24 that is inclined in the direction of discharging the air in the wheel 51 from the inner side to the outer side in the vehicle width direction is provided. doing.
With this configuration, when the connecting portion 24 is driven and rotated with respect to the hub 52 as will be described later, the air inside the wheel 51 is discharged to the outside of the vehicle 100 through the opening portion 23, so that the air resistance is reduced. However, the cooling effect of the hydraulic brake 10 is not impaired.

In the present embodiment, the resistance reducing portion 20 and the inner resistance reducing portion 20b, a outer resistance reducing portion 20a, the rotation speed omega _a of the outer resistance reducing unit 20a, the rotational speed of the inner resistance reducing portion 20b omega _b Bigger than. That is, the outer resistance reduction part 20a rotates at a faster speed than the inner resistance reduction part 20b.
With such a configuration, the difference in flow velocity between adjacent members is suppressed, so that the air resistance proportional to the square of the flow velocity difference is reduced.
In the above embodiment, the configuration in which the resistance reduction unit 20 includes the outer resistance reduction unit 20a and the inner resistance reduction unit 20b has been described. However, the resistance reduction unit 20 may include two or more, or any one of them. It is good also as a structure which has only.

Next, a resistance reduction unit 30 that is an air resistance reduction member of the vehicle 100 will be described as a second embodiment of the present invention.
In the following description of the embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

As shown in FIG. 5, the resistance reduction unit 30 is attached to the axle 60 on the inner side of the hydraulic brake 10, that is, on the + Y direction side, and on the + Y direction side of the outer resistance reduction unit 30a. Inner resistance reduction portion 30b.
Here, the configuration in which the resistance reduction unit 30 includes two of the outer resistance reduction unit 30a and the inner resistance reduction unit 30b will be described. However, the resistance reduction unit 30 may include two or more or only the inner resistance reduction unit 30b. It may be a configuration.

The inner resistance reduction portion 30b includes a bearing 31 that is an attachment portion attached to the axle 60, and an inner floating rotation portion 32 that is supported by the bearing 31 so as to be freely rotatable.
The inner floating rotating portion 32 includes a mounting surface 32a that rises in parallel to the XZ plane from the bearing 31, a cylindrical resistance suppression surface 32b that is parallel to the inner wall surface of the wheel 51 and has a height in the Y direction, and a resistance suppression surface 32b. And a flange portion 32c extending in parallel with the X direction at the end opposite to the mounting surface 32a.
An attachment surface 32a is fixed midway in the Y direction of the resistance suppression surface 32b.
That is, in the inner floating rotating portion 32, the mounting surface 32a is formed inside the outermost end portion in the vehicle width direction of the resistance suppressing surface 32b.
In other words, the inner floating rotating portion 32 has a bent portion 32d bent from the attachment surface 32a to the -Y direction, that is, the vehicle width direction outer side.

The outer resistance reducing portion 30a includes a bearing 31 that is an attachment portion attached to the axle 60, and an outer floating rotation portion 33 that is supported by the bearing 31 so as to be freely rotatable.
The outer floating rotating portion 33 has a mounting surface 33a that rises in parallel to the XZ plane from the bearing 31, and a concave wall surface 33d that is a first cylindrical surface that rises in parallel to the inner wall surface of the wheel 51 from the mounting surface 33a. ing.

The outer floating rotating portion 33 further includes a surface 33e that rises in parallel with the XZ plane from the concave wall surface 33d, and a resistance suppression surface 33b that is a second cylindrical surface parallel to the inner wall surface of the wheel 51.
The outer floating rotating portion 33 includes a resistance suppressing surface 33b and a flange portion 33c extending in parallel to the X direction at the end of the resistance suppressing surface 33b opposite to the surface 33e.
In other words, the outer floating rotating portion 33 has a concave portion 35 that is recessed toward the + Y direction, the hydraulic brake 10 occupies the concave portion 35, and the resistance suppression surface 32b of the inner floating rotating portion 32 is the outer floating rotating portion 33. It is arranged so that it can be stored inside.
Further, the resistance suppression surface 32b and the resistance suppression surface 33b are arranged to be parallel to each other.

That is, the outer floating rotating portion 33 has a concave wall surface 33d as a first cylindrical surface and a resistance suppression surface 33b as a second cylindrical surface, and the −Y direction end of the resistance suppression surface 33b, and the concave wall surface. The end portion of 33d in the -Y direction is held in a state of being connected via the surface 33e.
Further, the inner floating rotation unit 32 is held in a manner surrounded by the outer floating rotation unit 33.

  The inner floating rotating part 32 and the outer floating rotating part 33 have an opening 23 and a connecting part 24 having the same configuration as described in the first embodiment.

The outer floating rotation unit 33 and the inner floating rotation unit 32 are driven to rotate by the rotation of the wheel 51 in the A direction, as described in the first embodiment.
At this time, since the rotational speeds of the outer floating rotating part 33 and the inner floating rotating part 32 are smaller than the rotational speed of the wheel 51, the air resistance proportional to the square of the air flow rate difference is reduced.

Since the outer floating rotation portion 33 has a recess 35 that is recessed toward the + Y direction, and the hydraulic brake 10 is disposed so as to occupy the recess 35, the hydraulic brake 10 is disposed outside the resistance reduction portion 30. The cooling effect of the hydraulic brake 10 is high.
With this configuration, air resistance is reduced without impairing the cooling effect of the hydraulic brake 10.

Next, as a third embodiment of the present invention, a resistance reduction unit 40 that is an air resistance reduction member of the vehicle 100 will be described with reference to FIG.
As shown in FIG. 6, the resistance reduction unit 40 is attached to the axle 60 on the inner side of the hydraulic brake 10, that is, on the + Y direction side, and on the + Y direction side of the inner resistance reduction unit 40 b. An outer resistance reduction portion 40a.
The outer resistance reduction part 40a in this embodiment is attached by inverting the left and right of the outer resistance reduction part 30a described in the second embodiment.
Similarly, the inner resistance reduction part 40b in this embodiment is attached by inverting the left and right of the inner resistance reduction part 30b in the second embodiment.

The outer resistance reducing portion 40a includes a bearing 31 that is an attachment portion attached to the axle 60, and an outer floating rotation portion 43 that is supported by the bearing 31 so as to be freely rotatable.
The outer floating rotating portion 43 includes an attachment surface 43a that rises in parallel to the XZ plane from the bearing 31, a resistance suppression surface 43b that is parallel to the inner wall surface of the wheel 51, and an end portion of the resistance suppression surface 43b opposite to the attachment surface 43a. And a flange 43c extending in parallel to the X direction.
The outer floating rotating portion 43 has a concave portion 45 that is recessed in the −Y direction side, and the suspension 80 is disposed so as to occupy the concave portion 45.

The inner resistance reducing portion 40b includes a bearing 31 attached to the axle 60 and an inner floating rotating portion 42 supported by the bearing 31 so as to be freely rotatable.
The inner floating rotating portion 42 also has an attachment surface 42a rising parallel to the XZ plane from the bearing 31, a resistance suppression surface 42b parallel to the inner wall surface of the wheel 51, and an end of the resistance suppression surface 42b opposite to the attachment surface 42a. And a collar portion 42c extending in parallel with the X direction.
The attachment surface 42a is attached in the middle of the resistance suppression surface 42b.
That is, in the inner floating rotating portion 42, the mounting surface 42a is formed inside the outermost end portion in the vehicle width direction of the resistance suppressing surface 42b.
In other words, the inner floating rotating portion 42 has a bent portion 42d bent from the mounting surface 42a in the + Y direction, that is, inward in the vehicle width direction.

The outer floating rotating portion 43 and the inner floating rotating portion 42 are driven to rotate by the rotation of the wheel 51 in the A direction, as described in the first embodiment.
At this time, since the rotational speeds of the outer floating rotating part 43 and the inner floating rotating part 42 are smaller than the rotational speed of the wheel 51, the air resistance proportional to the square of the air flow rate difference is reduced.

The outer floating rotating portion 43 has a concave portion 45 that is recessed in the −Y direction side, and the suspension 80 is disposed so as to occupy the concave portion 45. With this configuration, since the suspension 80 is disposed on the inner side of the resistance reducing unit 40, the air resistance is further reduced.
With this configuration, air resistance is reduced without impairing the cooling effect.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and the present invention described in the claims is not specifically limited by the above description. Various modifications and changes are possible within the scope of the above.

For example, you may combine the outer side resistance reduction part shown in 1st Embodiment, and the inner side resistance reduction part shown in 2nd Embodiment.
Or you may combine the inner side resistance reduction part shown in 1st Embodiment, and the inner side resistance reduction part shown in 2nd Embodiment.

  In the embodiment, the vehicle has an internal combustion engine. However, the vehicle may be an electric vehicle using only a motor as a power source, or a hybrid vehicle using a motor and an internal combustion engine as power sources.

  The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

DESCRIPTION OF SYMBOLS 10 ... Hydraulic brake, 20, 30, 40 ... Air resistance reduction member (resistance reduction part), 21, 31 ... Mounting part (bearing), 22, 32, 42 ... Floating rotation part, 22a, 32a, 42a ... Supported Surface (mounting surface), 23 ... Opening portion, 24 ... Connecting portion, 45 ... Recess, 50 ... Tire, 51 ... Drive member (wheel), 52 ... Drive member (hub), 60 ... Drive member, drive shaft (axle) , 100 ... vehicle, 300 ... engine, A ... rotation direction, V ... flow velocity, X ... running direction (front-rear direction), Y ... vehicle width direction

Claims (6)

An attachment portion attached to a drive member that rotates as the vehicle travels;
It is supported by the mounting portion so as to be freely rotatable independently of the mounting portion, and is coaxial with the driving member in the same direction according to the movement of the fluid between the stationary member and the driving member that does not move as the vehicle travels. A floating rotating part that rotates following rotation,
An air resistance reducing member for a vehicle, wherein one end of the floating rotating portion faces the stationary member. The vehicle air resistance reducing member according to claim 1,
The air resistance reducing member of a vehicle, wherein the floating rotating portion has an opening formed on a surface side supported by the mounting portion. The air resistance reducing member for a vehicle according to claim 2,
A connecting portion that connects the inside and the outside of the opening;
When the vehicle rotates when the vehicle moves forward, the connecting portion is inclined in a direction in which the fluid is discharged toward the outside in the width direction of the vehicle. An air resistance reduction member for a vehicle according to any one of claims 1 to 3,
The vehicle air resistance reducing member according to claim 1, wherein the attachment portion is attached to a hub that contacts a wheel provided at a tip of a drive shaft of the vehicle. An air resistance reduction member for a vehicle according to any one of claims 1 to 3,
The vehicle air resistance reducing member according to claim 1, wherein the attachment portion is attached to a drive shaft of the vehicle. An air resistance reducing member for a vehicle according to any one of claims 1 to 5,
An air resistance reducing member for a vehicle, comprising a plurality of the floating rotating parts.

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