JP3814802B2 - Vehicle wheel and vehicle tire - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle wheel and a vehicle tire.
[0002]
[Prior art]
When the vehicle is frequently braked, the braking force may be reduced due to the temperature increase of the brake disk due to friction. Such a temperature rise can be suppressed by positively flowing air in the vicinity of the brake disc, that is, by an air cooling action. For example, in the automobile wheel disclosed in Patent Document 1, a disk-shaped member is attached to the outer side in the width direction of the wheel, and air flowing into the wheel from the outer side in the width direction is blocked by this member, thereby allowing the air in the vicinity of the disk to flow. I am letting.
[0003]
Further, Patent Document 2 discloses a structure of drain fins that excludes rainwater collected in the inner peripheral groove of a reverse type wheel. Specifically, an inner peripheral groove is formed on the inner peripheral surface of the rim, and an inclined weir-shaped drain fin is attached to the inner peripheral groove. Rainwater collected in the inner circumferential groove of the wheel is scraped by the rotation of the drainage fins and is removed to the outside from the inner circumferential groove.
[0004]
Further, Patent Document 3 discloses a tire in which ribs are formed on the outer surface of the sidewall portion. The rib is curved and extends in the radial direction of the tire.
[0005]
[Patent Document 1]
JP-A-3-74201 [Patent Document 2]
No. 3018937 [Patent Document 3]
JP-A-2001-39129 [0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a wheel having an excellent cooling action for a disc brake.
[0007]
[Means for Solving the Problems]
In order to solve this problem, the first invention provides a vehicle wheel having a rim and a plurality of fins provided on the inner peripheral surface of the rim. In this vehicle wheel, each of the fins extends over substantially the entire region in the width direction of the rim. Further, the extending direction of each fin is inclined with respect to the width direction of the rim.
[0008]
Here, in the first invention, when the extending direction is defined as a direction in which the fin extends from the inner side to the outer side of the wheel, an angle formed by the extending direction and the rotating direction of the rim is an obtuse angle. Preferably there is. Further, it is desirable that each of the fins be provided point-symmetrically with respect to the central axis of the rim. Further, each of the fins may extend while being curved.
[0009]
In the first invention, the fins preferably have the same shape, and the extending direction of the fins is preferably the same direction.
[0010]
In the first invention, a fin member that is detachably attached to the edge of the rim and is integrally formed with an annular base and a plurality of fins attached to the edge of the rim may be further provided. In this fin member, each of the fins extends from the annular edge of the base so as to protrude in the axial direction of the rim. In addition, a plurality of types of fin members are prepared, and it is preferable that one type of fin member and another type of fin member have different fin extending directions or the number of fins.
[0011]
2nd invention provides the tire for vehicles which has a side wall part and the projection part formed in the outer surface of a side wall part. In this vehicle tire, the height of the protrusion is 1.0 cm or more and 2.0 cm or less. Moreover, it is preferable that the extending direction of the protrusion is inclined with respect to the radial direction of the vehicle tire.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
(First reference example )
FIG. 1 is a cross-sectional view of a vehicle wheel according to a first reference example . The vehicle wheel 1 (hereinafter referred to as wheel 1) includes a rim 2 to which a tire (not shown) is attached, and a spoke 3 (illustrated by a dotted line) that connects the rim 2 and an axle mounting hub. A plurality of fins 4 are provided on the inner peripheral surface 2 a of the rim 2, and each fin 4 extends while being inclined with respect to the width direction of the rim 2 over substantially the entire width direction of the rim 2. Exist. In this reference example , each fin 4 is inclined in the same direction and extends while curving. When the wheel 1 is attached to the axle, a brake disk 5 (illustrated by a dotted line) is disposed inside the wheel 1 in the width direction. Further, as shown in FIG. 3, when the direction in which the fin 4 extends from the inner side to the outer side of the wheel 1 (or the rim 2) is defined as the extending direction B, the extending direction B and the rotation of the rim 2 are determined. The angle θ formed with the direction A is an obtuse angle. This is because the airflow from the inner side to the outer side of the wheel 1 is positively formed to enhance the cooling effect of the brake disc 5 as will be described later.
[0013]
FIG. 2 is a schematic side view of the wheel 1 viewed from the side in the width direction in FIG. In the figure, the spoke 3 is omitted for easy understanding of the drawing. Each fin 4 is provided point-symmetrically with respect to the central axis of the rim 2 on the inner peripheral surface 2a. That is, the four fins 4 existing on the upper, lower, left and right sides of the inner peripheral surface 2 a are provided at equal intervals in the circumferential direction of the rim 2. Each fin 4 has substantially the same shape, and specifically has a cross-sectional shape protruding from the inner peripheral surface 2a in a substantially inverted V shape.
[0014]
FIG. 3 is an explanatory diagram of air flow (airflow) in the wheel 1 during vehicle travel. When the wheel 1 is rotated in the direction of the arrow A, the air existing in the inner space of the wheel 1 flows in the direction of the arrow C, that is, from the inside to the outside of the wheel 1. When the wheel 1 is rotated, the pressure in the vicinity of the inner peripheral surface 2a decreases. Therefore, the air existing in the inner space of the wheel 1 flows toward the outer side in the radial direction of the wheel 1, in other words, the vicinity of the inner peripheral surface 2a. The air flow direction is uniquely specified by the relationship between the rotation direction of the wheel 1 and the inclination direction of the fins 4. The air that flows in the vicinity of the inner peripheral surface 2a is guided to the fins 4 provided on the inner peripheral surface 2a, and is discharged to the outer side in the width direction (outer side in the axle direction).
[0015]
Thus, in this reference example , when the wheel 1 is rotated in the direction of arrow A in FIG. 3, the rotation of the fins 4 provided on the inner peripheral surface 2 a causes the wheel 1 to move outward in the width direction. An air flow indicated by an arrow C is generated. Since the air in the vicinity of the brake disk 5 is forced to flow by such an air flow, the brake disk 5 can be cooled. Further, when a vehicle with the wheel 1 attached as in the present reference example is run, the air force is discharged from the wheel 1 to the outside in the width direction, and downforce acts on the vehicle. This down force is a downward force on the vehicle, and is generated when the airflow on the side surface of the vehicle is attracted to the airflow discharged outward from the wheel 1. When the downforce is applied to the vehicle, it is necessary to provide the right and left wheels 1 in the opposite direction of the inclination of the fins 4 because of the relationship between the rotation direction of the wheel 1 and the inclination direction of the fins 4 as described above. .
[0016]
Further, by curving and extending the fins 4, the air can flow smoothly along the fins 4. Further, the fins 4 have substantially the same shape, are provided point-symmetrically with respect to the central axis of the rim 2 on the inner peripheral surface 2a, and are inclined in the same direction. For this reason, an undisturbed airflow can be generated in the internal space of the wheel 1, and the flow rate of the airflow can be increased.
[0017]
In the reference example described above, the form in which the fins 4 are provided on the wheel 1 whose cross-sectional shape in the width direction of the rim 2 is linear has been described. However, the fin 4 can be similarly provided on a wheel in which the center of the rim 2 is recessed inward in the axial direction (the same applies to the wheel of this embodiment described later).
[0018]
In the reference example described above, the fins 4 are provided integrally with the wheel 1. However, the wheel 1 and the fin 4 may be provided separately and used in combination. FIG. 4 is a diagram showing the wheel of the present embodiment . As shown in the figure, a fin member 6 in which a plurality of fins 4 'are formed is attached to a wheel 1' in which no fins are provided. The fin member 6 is detachably attached to the edge of the rim 2 and has a plurality of fins 4 ′ and an annular base 7. Each fin 4 ′ extending in a comb shape protrudes in the axial direction from the base portion 7. Further, each fin 4 ′ is inclined in the circumferential direction of the base portion 7 with respect to the axial direction of the base portion 7, similarly to the above-described reference example . Thus, by providing the wheel 1 ′ and the fin member 6 separately, the user can select a fin member 6 having a desired performance from among a plurality of types of fin members 6 prepared. Therefore, by using the fin member 6 having the desired performance and the wheel 1 ′ in combination, the user can ensure the optimum performance of the disc brake according to the frequently used speed zone.
[0019]
(Second reference example )
FIG. 5 is a perspective view of a tire according to a second reference example . The tire 10 includes a tread portion 11, a pair of left and right bead portions 12, and a pair of left and right sidewall portions 13 that are interposed between the tread portion 11 and the bead portion 12 to connect them. A protrusion 14 is formed on the outer surface of the sidewall 13. From the viewpoint of protecting the wheel, the inventors have studied through experiments, simulations, and the like, and as a result, the height of the protrusion 14 is set in the range of 1.0 cm to 2.0 cm. As shown in FIG. 6, the extending direction of the protrusions 14 may be inclined with respect to the radial direction of the tire 10.
[0020]
Thus, in this reference example , by forming the protrusion 14 on the outer surface of the sidewall portion 13, it is possible to prevent the edge of the wheel to which the tire 10 is attached from coming into contact with the curbstone. FIG. 7 is an explanatory diagram of wheel protection by the protrusion 14. That is, when the tire 10 is attached to the wheel 15, the height of the protrusion 14 formed on the sidewall 13 is higher than the protruding length of the edge of the wheel 15 protruding from the sidewall 13. Therefore, the protrusion 14 can prevent the edge of the wheel 15 from contacting a curbstone or the like, and can protect the edge of the wheel 15.
[0021]
Further, by inclining the extending direction of the protruding portion 14 with respect to the radial direction of the tire 10, noise is generated by the protruding portion 14, and air on the outer surface of the sidewall portion 13 flows along the protruding portion 14. And can flow smoothly. When the tire 10 according to this reference example is attached to the wheel 1 according to the reference example described above, there is a possibility that the noise generated by the fins 4 on the wheel 1 side can be offset by the noise of the protrusions 14. Furthermore, there is a possibility that the flow rate of the airflow discharged from the wheel 1 can be increased by the airflow generated on the outer surface of the sidewall portion 13.
[0022]
【The invention's effect】
According to the present invention, by providing the fin on the inner peripheral surface of the rim, an air flow is generated in the wheel when the wheel rotates. As a result, the brake disc can be effectively cooled by the air cooling action of the generated airflow.
[Brief description of the drawings]
[1] in the wheel according to the first cross-sectional view Figure 2 is a schematic side view of the vehicle wheel according to a first reference example of the vehicle wheel according to a reference example FIG. 3 the first reference example according to the perspective view FIG. 6 a second reference example of the tire according to the second reference example perspective view Figure 5 showing a WHEEL for a vehicle according to diagram 4 shows the embodiment of the flow of air FIG. 7 is a perspective view showing a modified example of a tire. FIG. 7 is an explanatory diagram of vehicle wheel protection by a protrusion according to a second reference example .
1, 1 ', 15 Vehicle wheel 2 Rim 2a Inner peripheral surface 3 Spoke 4, 4' Fin 5 Brake disk 6 Fin member 7 Base 10 Tire 11 Tread part 12 Bead part 13 Side wall part 14 Projection part

Claims (1)

In vehicle wheels,
With the rim,
One having a desired performance is selected by the user from those prepared in plural types, and has a fin member that is detachably attached to the edge of the rim,
The fin member selected by the user is
An annular base;
A plurality of fins integrally formed on the annular base portion, each projecting in a comb shape in the axial direction of the rim from the annular base portion;
Of the fin members prepared in the plurality of types, one type and another type have different extending directions of the fins or the number of fins.

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