JPH0416018Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a protective cover for a disk rotor.

PRIOR ART Disc brakes generally include a bottom wall parallel to the disc rotor and a peripheral wall extending from the outer periphery of the bottom wall toward the disc rotor, and are mounted inside the wheel so as to cover the disc rotor that rotates together with the wheel. On the other hand, a protective cover is provided with ventilation holes for introducing cooling air into the disk rotor. The circumferential wall of such a protective cover is usually formed so that its diameter increases with distance from the bottom wall, that is, it is opened at a predetermined angle, and the ventilation holes are formed on the outer periphery of the bottom wall or It is installed on the surrounding wall.

However, in order to further improve the cooling efficiency of the disk rotor, if we try to provide ventilation holes on both the outer circumference of the bottom wall and the peripheral wall of the protective cover, it is difficult to provide ventilation holes on only one side. In comparison, it requires more man-hours and equipment, so it is unavoidable that the cost of the protective cover increases. On the other hand, as shown in FIG. 4, by simultaneously punching out the outer peripheral part of the bottom wall 50 and a part of the surrounding wall 52 following it in a direction parallel to the axis, the bottom wall 50 and the surrounding wall 52 are punched out.
It is conceivable to form ventilation holes 54 that open in both directions at an acute angle with respect to the punching direction, as shown by the dashed lines in the figure, all at once without increasing the number of man-hours. As a result, the ends of the peripheral wall punching portion 58 punching out the peripheral wall 52 of the punch 56 and the fitting portion 62 of the die 60 into which the peripheral wall punching portion 58 is fitted both have a sharp shape, making it impossible to maintain strength. Therefore, it is extremely difficult to form the above-mentioned ventilation holes 54 opening in both walls 50, 52 by punching.

Means for Solving the Problems The present invention was developed against the background of the above-mentioned circumstances, and its gist is that the bottom wall parallel to the disk rotor and the outer periphery of the bottom wall be connected to the disk rotor. Openings are provided in a direction parallel to the axis of the disc rotor and in a radial direction, by punching the peripheral wall extending toward the rotor, and the part located between the bottom wall and the peripheral wall from a direction perpendicular to the bottom wall. A protective cover is provided with a ventilation hole, and is installed inside a wheel to cover the disc rotor rotating together with the wheel, while introducing cooling air from the ventilation hole to the disc rotor, A part of the outer circumferential side of the protective cover is made to have a stepped shape by bringing a part of the outer circumferential side of the bottom wall closer to the disk rotor side and forming a second bottom wall parallel to the bottom wall; The ventilation hole is formed by punching out a portion surrounded by a closed curve passing through the bottom wall and the second bottom wall.

Operation and Effect of the Invention By doing this, a part of the outer peripheral side of the bottom wall parallel to the disc rotor is brought closer to the disc rotor side, and a second bottom wall parallel to the bottom wall is formed. Since a part of the outer circumferential side of the protective cover is shaped like a step, both bottom walls are located at right angles to a direction parallel to the axis of the disc rotor (the punching direction). As a result, when punching a portion surrounded by a closed curve passing through both bottom walls in a direction parallel to the axis, it is avoided that a part of the punch and die become sharp as in the conventional case. It becomes possible to simultaneously punch out parts of both bottom walls and a part of the peripheral wall connecting them while maintaining the strength of the punch and die. As a result, ventilation holes that open in the direction parallel to the axis of the disk rotor and in the radial direction can be formed in the part located between the bottom wall and the peripheral wall without increasing the number of work steps, and the ventilation holes provide protection. The cooling efficiency of the disk rotor can be further improved without increasing the cost of the cover.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, 10 is a wheel that constitutes a part of the wheel. On the inner circumferential side of the wheel 10, a hub 1 is rotatably supported via a bearing on a shaft (not shown) of a knuckle 12 as a non-rotating member.
4 is fixed with bolts 16 and the like, and a disk rotor 18 that is rotated together with the wheel 10 is fixed to the hub 14 with bolts 20. A support member 22 that supports a caliper (not shown) is fixed to one end of the nutcle 12.
A protective cover 24 is fixed to the support member 22 for covering the disk rotor 18 and protecting it from muddy water and the like.

The protective cover 24 is press-molded from a single sheet of plate material, and as shown in FIG.
A peripheral wall 28 extends from the outer peripheral edge of the disc rotor 18 to cover the outer peripheral part of the disc rotor 18 and becomes larger in diameter toward the disc rotor 18.
A through hole 30 is formed in the center of the bottom wall 26, through which the hub 14, the shaft, etc. pass. The outer peripheral portion of the protective cover 24 and the bottom wall 26
In a part of the corner formed by the and peripheral wall 28 (on the front side of the vehicle and slightly lower side), there is a ventilation hole 32 that opens in two directions, parallel to the axis and in the radial direction. It is formed. In addition, 34
is a duct for guiding cooling air toward the ventilation hole 30 when the vehicle is running, and is appropriately arranged as necessary.

FIG. 2 is a diagram showing the protective cover 24 before the ventilation holes 32 are formed. The bottom wall 26 is recessed in a direction parallel to the axis at the corner of the protective cover 24 to form a concave portion 36, and a part of the outer circumferential side of the protective cover 24 is stepped. A second bottom wall 38 parallel to the second bottom wall 26 and a second peripheral wall 40 that curves radially inward from the peripheral wall 28 are formed. Therefore, both the bottom walls 26 and 38 are located at right angles to the direction parallel to the axis of the disk rotor 18 (the punching direction), so the bottom wall 26 of the protective cover 24 and the second peripheral wall 40 , and the part surrounded by the closed curve 42 passing through the second bottom wall 38, in a direction parallel to the axis (downward in the figure) as shown in FIG. 44 and the die 46 are prevented from being formed with a peripheral wall punched portion 58 and a fitting portion 62 having a sharp tip as in the conventional case. As a result, while maintaining the strength of the punch 44 and the die 46, it is possible to simultaneously punch out parts of both bottom walls 26 and 38 and a part of the second peripheral wall 40.
Ventilation holes 32 that open in two directions, parallel to the axis and in the radial direction, are formed at once in a portion located between the bottom wall 26 and the peripheral wall 28 of the protective cover 24 without increasing the number of man-hours and equipment. It is possible. As a result, the cooling air introduced through the duct 34 as the vehicle travels in the direction A in FIG. The cooling efficiency of the disk rotor 18 can be further improved without increasing the cost of the disk rotor 24.

Furthermore, according to the embodiment described above, the punching of the ventilation holes 32 can be performed simultaneously with the punching of the through holes 30, etc., and there is no need to provide a separate process for forming the ventilation holes 32. Therefore, it is possible to further avoid an increase in the cost of the protective cover 24 due to the formation of the ventilation hole 32 having the above-described effect.

In the above-mentioned embodiment, the case where the circumferential wall 28 is formed to have a larger diameter as it becomes farther away from the outer circumferential edge of the bottom wall 26 has been described, but in the present invention, the circumferential wall is formed parallel to the axis of the bottom wall. It can also be applied to cases where the structure is formed in any direction.

In addition, various changes may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view showing the main parts of a wheel equipped with a disk rotor protective cover to which the present invention is applied. FIG. 2 is a perspective view of a main part of the protective cover before the ventilation holes of FIG. 1 are formed. FIG. 3 is a diagram showing a step of forming ventilation holes in the protective cover of FIG. 2 by punching, and is a sectional view showing the main part. FIG. 4 is a diagram corresponding to FIG. 3, showing a process of forming ventilation holes opening in the bottom wall and the peripheral wall by punching in a conventional protective cover. 18... Disc rotor, 24... Protective cover, 26... Bottom wall, 28... Peripheral wall, 32... Ventilation hole, 38... Second bottom wall, 42... Closed curve.

Claims (1)

[Claims for Utility Model Registration] A bottom wall parallel to the disc rotor, a peripheral wall extending from the outer peripheral edge of the bottom wall toward the disc rotor, and a portion located between the bottom wall and the peripheral wall perpendicular to the bottom wall. A ventilating hole is provided by punching from a certain direction and opens in a direction parallel to the axis of the disc rotor and in a radial direction, so as to cover the disc rotor rotating together with the wheel inside the wheel. The protective cover is of a type in which cooling air is introduced into the disk rotor from the ventilation hole, and a part of the outer circumferential side of the bottom wall is brought closer to the disk rotor side so as to be connected to the bottom wall. By forming a parallel second bottom wall to make a part of the outer peripheral side of the protective cover step-like, and punching out a portion surrounded by the bottom wall and a closed curve passing through the second bottom wall. A protective cover for a disc rotor, characterized in that the ventilation hole is formed therein.