JPH0374201A - Automstive wheel - Google Patents

Abstract

PURPOSE:To enhance cooling performance of a brake in a light-weight wheel by projecting the outer end in the vehicle's width direction of a radial fin, which is provided on a disc part, more outward in the width direction than an opening part of a rim part, together with attaching a disc-type member to the projecting end. CONSTITUTION:An end part 4a of each of many fins 4, which are radially formed on a disc part 3 from a wheel center part 1 toward a rim part 2, is projected more outward by a distance A than an opening part of the rim part 2 in the width direction of an automobile. This distance A is set at about 10 to 40mm. A disc-type member 5, which is situated concentrically with an axle, is brought in contact with the fin-end 4a and fixed thereto by a bolt 6. With this constitution, an air flow, which otherwise flows into the wheel from the outside in the width direction of the automobile, is hindered by the disc-type member 5, thereby increasing both flow rate and flow velocity of the air passing from inside to outside. Accordingly, the cooling performance of a brake can be enhanced.

Description

[Detailed description of the invention] (Industrial application field) TECHNICAL FIELD The present invention relates to an automobile wheel.

(Conventional technology) In recent years, lightweight wheels such as Algo wheels and magnesium wheels, which were exclusive to sports cars and racing cars, have been adopted for general vehicles. By adopting lightweight wheels, the unsprung load can be reduced compared to steel wheels, improving driving performance. In the case of such a lightweight wheel, weight reduction can be achieved not only by changing the material, but also by changing the shape of the disc part that connects the center wheel part and the rim part, for example, by configuring it from a plurality of fins instead of a plate shape. I'm trying.

It is known that the disk part is made up of meshes, spokes, etc. in addition to fins, and these are described in, for example, Motor Fan Magazine 1986. It is described on pages 183-214 of the April issue. Furthermore, since aesthetic requirements are strong in general vehicles, the shape of the disc portion is designed to not only reduce weight but also satisfy aesthetic requirements.

(Problem to be Solved by the Invention) However, in conventional automobile wheels such as this, the aim was to reduce weight and improve aesthetics, so the brake located inside the wheel was moved through the inside of the wheel, that is, through the disc part. The problem was that it could not be used for automobiles that need to be cooled by airflow, such as sports cars and racing cars.

That is, in sports cars and racing cars, sudden braking is frequently applied from high-speed driving conditions, so the brakes are always in a high temperature state and the braking force tends to decrease. This reduction in braking force can be prevented by cooling the brakes with an airflow that passes through the wheel through 1ffi, but in the case of conventional automobile wheels, where the aerodynamics of the flow within the wheel have been insufficiently considered, the brake It was not possible to generate enough air flow within the wheel to provide sufficient cooling.

To explain in detail, when a car is running, the inner side of the wheel in the vehicle width direction is inside the wheel house, so air is more likely to stagnate than the outside. Since the pressure tends to increase, the airflow flowing from the inside to the outside in the vehicle width direction is blocked, and the actual airflow inside the wheel tends to flow as shown by the arrow L in the wheel shown in Figure 9.10. The flow rate and velocity were both very small.

Therefore, in the case of conventional automobile wheels, the ability to cool the brakes is extremely low, making them unsuitable for sports cars and racing cars.

(Purpose of the Invention) Therefore, the present invention aims to prevent the airflow from flowing into the wheel from the outside in the vehicle width direction near the center of the wheel with a disc-shaped member, and to pass through the inside of the wheel from the inside in the vehicle width direction to the outside. The object of the present invention is to provide an automobile wheel that increases the flow rate and flow velocity of airflow and is compatible with automobiles that require high brake cooling performance.

(Means for Solving the Problems) In order to achieve the above object, the automobile wheel according to the present invention has the following features:
It has a wheel center part, a rim part on the outer periphery of the wheel, and a disc part connecting both parts, and the disc part forms a plurality of fins radially from the wheel center part toward the rim part. In the automobile wheel, the fin end, which is located outside in the vehicle width direction, is made to project outward in the vehicle width direction from the opening surface of the rim portion, and a disc-shaped member is attached to the projected fin end. It is something.

(Function) In the present invention, the disk-shaped member blocks the airflow flowing into the wheel from the outside in the vehicle width direction near the center of the wheel, and the airflow flowing into the wheel from the inside in the vehicle width direction is prevented by the disk-shaped member. It flows smoothly to the outside of the wheel in the vehicle width direction through the gap between the member and the rim part.

Therefore, the flow rate and flow velocity of the airflow passing through the wheel are increased, and the cooling performance of the brakes cooled by this airflow is improved.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1 to 7 are diagrams showing an embodiment of an automobile wheel according to the present invention.

First, the configuration will be explained.

ML In Figure 2, 1 is the wheel center part, and the wheel center part 1 is the wheel mounting hub (not shown).
installed on. A rim portion 2 is provided on the outer periphery of the wheel, and a tire (not shown) is attached to the rim portion 2. The wheel center part 1 and the rim part 2 are connected by a disc part 3, and the disc part 3 has a large number of fins 4 formed radially from the wheel center part 1 toward the rim part 2.
It consists of M is a brake disc connected to the wheel mounting hub, and the brake disc M is located within the wheel.

Here, the fin end 4a on the outside in the vehicle width direction of each fin 4 protrudes outward in the vehicle width direction from the opening surface of the rim portion 2 by a dimension A, and the six dimensions are 10n+n+~4 according to the experimental results described below.
A range of 0 mm is preferred. Further, a disc-shaped member 5 provided coaxially with the axle is in contact with the fin end 4a, and the disc-shaped member 5 is attached to the fin end 4a with bolts 6. The disc-shaped member 5 has an outer diameter that is approximately equal to the rim diameter, which is the nominal dimension of the wheel, and the 8 dimensions in Fig. 1 are approximately 15 mm in this case, but according to the experimental results described below, the A dimension Similarly, a range of 1 On+n+ to 40 mm is preferable.

On the other hand, the cross-sectional shape of the fin 4 taken along the line X-x in FIG. 1 may be a thin shape as shown in FIG. 3, or may have a hollow portion 4b as shown in FIG. It may be something like a spoke shape. In both the image shapes shown in Fig. 3.4, both end surfaces 4c and 4d of the fin 4 are surfaces substantially parallel to the vehicle width direction, and by setting the dimensions of the end surfaces 4c and 4d in the vehicle width direction to 30 mm or more, The effect of the invention is demonstrated.

Next, the action will be explained.

When the car is running and the wheels rotate, the pressure near the rim part 2 is lower than the pressure near the wheel center part 1 due to the speed difference between the inner and outer circumferences of the wheel, and the pressure near the opening surface of the rim part 2 on the outside in the vehicle width direction is lowered than the pressure near the wheel center part 1. The pressure is lower than the pressure near the opening surface of the rim portion 2 on the inner side in the vehicle width direction, which is the wheel house side.

Therefore, in a conventional wheel, an air flow flows into the wheel from the center on the outside in the vehicle width direction and flows out to the outer circumference on the outside in the vehicle width direction, but in this example, this air flow is circular. This is completely blocked by the plate member 5. As a result,
As shown by arrow W in Fig. 1.5, the airflow flowing in from the inside in the vehicle width direction smoothly flows to the outside in the vehicle width direction from the gap between the rim portion 2 and the disc-shaped member 5 without being obstructed by other flows. leak. Furthermore, compared to the conventional system in which the airflow inside the wheel was stagnant due to mutual interference, the flow rate of the airflow passing through the wheel is significantly increased.

Therefore, in this embodiment, the brake disc M can be sufficiently cooled by the airflow passing through the inside of the wheel, and can be applied to sports cars, racing cars, etc. that require high brake cooling performance.

Here, as a result of an experiment conducted to confirm the effect of this example, the wheel was rotated at 2000 rpm and the brake was repeatedly applied 0N10 F F. Part 5
The graph in Figure 6.7 shows the results of measuring the discharge flow rate from the gap between the two. The solid line graph in Figure 6.7 shows 8 dimensions as 3
These are the measurement results when dimension A is varied while keeping 0 mm constant, and the dotted line graph in Figure 6.7 is the measurement results when dimension 6 is kept constant at 35 mm and dimension 8 is varied. Figure 6.7 also shows the measurement results for a conventional spoke type wheel, and the brake fluid temperature in Figure 6 is 200.
℃ or less satisfies the specifications. From the above experimental results, it has been confirmed that both A dimension and 8 dimension have a brake cooling effect in the range of 10 mm to 40 mm, and within this range, the brake fluid temperature of the conventional wheel is NG. Of course, the lower temperature is 200, which is the specified temperature.
℃, and the discharge flow rate is approximately twice that of conventional wheels.

On the other hand, if the dimensions A and 8 are 10 mm or less, the opening area of the interval between the rim part 2 and the disc-shaped member 5 is 2π×]] - 1
1- decreases and ventilation resistance increases, a flow that circulates only in the vicinity of the gap between the rim portion 2 and the disc-shaped member 5 as shown by the arrow N in FIG. 8 occurs. It was determined that the cooling effect of the brakes decreases rapidly.

The optimum range of dimensions A and 8 varies depending on the size of the wheel, the number of revolutions of the wheel, etc., but for general automobile wheels, it is preferable to set it within the above-mentioned range of 1 On+n+ to 40 mm.

Further, the present invention is of course applicable not only to vehicles using disc brakes as brakes but also to vehicles using drum brakes.

(Effect) According to the present invention, the outer fin end in the vehicle width direction is made to protrude beyond the opening surface of the rim portion, and the disc-shaped member is attached to the protruding fin end, so that the vehicle width near the center of the wheel is The disk-shaped member can block the airflow that is about to flow into the wheel from the outside in the direction, and the flow rate and flow velocity of the airflow passing through the wheel from the inside to the outside in the vehicle width direction can be increased. Therefore, the brake can be sufficiently cooled, and the cooling performance of the brake can be improved.

[Brief explanation of drawings]

1 to 8 are diagrams showing one embodiment of the automobile wheel according to the present invention, in which FIG. 1 is a sectional view thereof, FIG. 2 is a front view thereof, and FIG. XX cross-sectional view, FIG. 5 is a schematic diagram for showing air flow, FIG.
Figure 7 is a graph showing the measurement results of the fluid temperature of the playing cow, Figure 7 is a graph showing the measurement results of the protruding flow velocity at the outer circumference of the wheel, Figure 8 is a schematic diagram showing the air flow, and Figure 9.1.
FIG. 0 is a schematic diagram showing the air flow of a conventional automobile wheel. 1...Wheel center part, 2...Rim part, 3...Disc part, 4...Fin, 4a...Fin end, 5...Disk-shaped member.

Claims (1)

[Claims] It has a wheel center part, a rim part on the outer periphery of the wheel, and a disc part connecting both parts, and the disc part forms a plurality of fins radially from the wheel center part toward the rim part. In the automobile wheel, the fin end, which is located outside in the vehicle width direction, is made to project outward in the vehicle width direction from the opening surface of the rim portion, and a disc-shaped member is attached to the projected fin end. Automotive wheels.