JPS6221142Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disc brake rotor for a vehicle, and more particularly to a ventilated disc brake rotor that can suppress noise during braking.

An unpleasant noise may occur when the disc brake is activated. This is called brake squeal, and a major cause of this is resonance vibration of the disc brake rotor due to frictional vibration between the disc brake rotor and the friction pads pressed against it. Countermeasures have been taken to address this problem, such as changing the rigidity and material of the disc brake rotor, but their effectiveness is inconsistent depending on the model, usage history, etc., and there is still no realistic and definitive means to prevent squealing. unknown.

The inventor of the present invention has conducted extensive research against the background of the above circumstances, and has found that when disc brake squeal occurs, the ventilated disc rotor is affected by nodes in the circumferential direction (the nodes themselves are located along the circumferential direction). It was discovered that the diametrical nodes vibrate in most of the vibration modes, and do not include circumferential nodes. The present invention was made based on the above findings.

That is, the gist of the present invention is that the inner friction plate part and the outer friction plate part are arranged so that ventilation is possible between the inner friction plate part and the outer friction plate part from the inner peripheral edge to the outer peripheral edge. In a disc brake rotor equipped with a connecting wall that connects the friction plate part, the connecting wall is formed on one circle around the rotation center of the disc brake rotor at an intermediate position between the inner peripheral edge and the outer peripheral edge. , a peripheral wall portion provided with a ventilation hole that communicates the inner peripheral edge side with the outer peripheral edge side, an outer wall portion extending approximately radially from the peripheral wall portion toward the outer peripheral edge side, and an inner wall portion extending approximately radially from the peripheral wall portion toward the inner peripheral edge side. The purpose is to include the following.

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

In FIGS. 1 and 2, reference numeral 2 denotes a ventilated type disc brake rotor, which includes a cylindrical part 6 with a mounting hole 4 on one end surface, and the other parts of the cylindrical part 6. It consists of a flange-shaped friction plate portion that protrudes radially outward at the end. The friction plate portion consists of an inner friction plate portion 8 and an outer friction plate portion 10 superimposed on the inner friction plate portion 8 at a constant interval. are combined.

The connecting wall is the inner peripheral edge 12 of the friction plate parts 8, 10.
and an outer circumferential edge 14, a circumferential wall portion 16 formed on one circumference centered on the rotation center of the disc brake rotor 2, and a circumferential wall portion 16 formed in a radial direction from this circumferential wall portion 16 toward the outer circumferential edge 14. It is composed of a plurality of outer wall parts 18 and an inner wall part 20 formed in a radial direction from the peripheral wall part 16 toward the inner peripheral edge 12. This inner wall portion 20 is provided asymmetrically with respect to the outer wall portion 18 with respect to the peripheral wall portion 16. That is,
The outer wall portions 18 are formed at 12 locations at equal intervals along the outer circumferential edge 14, whereas the outer wall portions 18 are formed at 12 locations at equal intervals, but differ from the circumferential position and shape (thickness of the wall in the circumferential direction) of the outer wall portions 18. Thick inner wall portions 20 are formed at three locations along the inner wall edge 12. Note that three ventilation holes 22 are formed in the peripheral wall portion 16 at equal intervals on the circumference, and the peripheral wall portion 16 between the ventilation holes 22
Since the length in the circumferential direction matches the thickness of the inner wall portion 20, these walls 16 and 20 appear to form a thick circular arc-shaped wall in the radial direction.

The effects of this embodiment will be explained below.

An inner side friction plate part 8 and an outer side friction plate part 1 of the disc brake rotor 2 which rotates together with the wheel.
When a friction pad (not shown) is pressed, frictional vibrations are generated in the frictional part, and the disc brake rotor 2 is caused to vibrate by the frictional vibrations. However, unlike conventional rotors, the disc brake rotor 2 is less likely to generate vibration in a mode having diameter nodes, and the noise caused by the resonance of the disc brake rotor 2 itself is extremely small. That is, the inner side friction plate part 8 and the outer side friction plate part 1
The connecting wall portions where the friction plate parts 8 and 10 are connected serve as nodes in the vibration of the friction plate parts 8 and 10 because mutual free vibration is suppressed. For this reason, the friction plate portions 8, 1
0 resonates in a vibration mode having a circumferential node that coincides with the peripheral wall portion 16 portion. In other words, the friction plate parts 8 and 10 subjected to frictional motion are configured to vibrate in a vibration mode consisting of circumferential nodes and almost no diametrical nodes due to the action of the coupling wall, and in this vibration mode, The vibrations of the disc brake rotor 2 hardly contain vibrations in the audible frequency band. Since such an effect is based on the peripheral wall portion 16, it can be obtained regardless of the type or material of the disc brake rotor.

Further, the friction plate parts 8 and 10 are connected to each other by an outer wall part 18 on the outer peripheral edge side of the peripheral wall part 16, and by an inner wall part 20 on the inner peripheral edge side. Because the friction plate parts 8 and 10 extend in the radial direction, that is, in the direction orthogonal to the peripheral wall part 16, the rigidity of the entire friction plate parts 8 and 10 is increased compared to the conventional one. is less likely to occur, and the noise prevention effect is enhanced.

Furthermore, in this embodiment, since the outer wall portion 18 and the inner wall portion 20 are arranged at different positions with the peripheral wall portion 16 as a boundary, the vibrations are less likely to include the diameter nodes that tend to generate noise.

Next, another embodiment of the present invention will be described.

In FIGS. 3 and 4, the connecting wall includes a peripheral wall portion 36 formed on one circumference at an intermediate position between the inner peripheral edge 32 and the outer peripheral edge 34, and a peripheral wall portion 36 that extends radially from the peripheral wall portion 36 toward the outer peripheral edge 34. It is comprised of a plurality of outer wall parts 38 formed in the direction, and an inner wall part 40 formed in the radial direction from the peripheral wall 16 toward the inner peripheral edge 32. The outer wall portion 38 is the outer wall portion 18 described above.
Similarly, 12 holes are formed at equal intervals along the outer peripheral edge 34, and ventilation holes 42 are provided at intermediate positions of the outer wall part 38 of the peripheral wall part 36 to allow ventilation from the inner peripheral edge 32 side to the outer peripheral edge 34 side. It is being Further, the inner wall portion 40 is provided at an asymmetrical position with respect to the outer wall portion 38 with respect to the peripheral wall portion 36. That is, three pairs of inner wall portions 40 are provided along the inner peripheral edge 32 with each fourth ventilation hole 42 in between.

Therefore, according to this embodiment, in addition to the same effects as the above-mentioned embodiments, the cooling efficiency is high due to the large number of ventilation holes 42, and in particular, the volume of the inner wall portion 40 is small, making the disc brake rotor lightweight. There are advantages.

The above-mentioned embodiment is merely one embodiment of the present invention, and various modifications may be made to the present invention without departing from the spirit thereof.

For example, the outer peripheral edges 14, 34 and the inner peripheral edges 12, 3
Peripheral wall portion 1 formed on one circumference at an intermediate position between 2 and 2.
6 and 36 can be provided not only at the center position but also at a position within a range of intermediate positions where the noise is most effectively prevented, depending on the characteristics of various types of disc brake rotors.

In addition, the outer wall portions 18, 38 and the inner wall portions 20, 40
Various changes can be made to the shape, position, and number of arrangements.
40, if they are arranged differently with the peripheral wall portions 16 and 36 as boundaries, even greater effects can be obtained.

As detailed above, in the disc brake rotor of the present invention, the inner side friction plate part and the outer side friction plate part are connected to each other at the radially intermediate part by the circumferential wall part extending in the circumferential direction. Therefore, vibration modes with diameter nodes are less likely to occur.
The generation of vibrations in the audible frequency range is effectively prevented,
Regardless of the shape or material of the disc brake rotor, the effect of reducing noise during braking can be obtained.

Further, in the disc brake according to the present invention, the inner side friction plate part and the outer side friction plate part are connected to each other on the outside and inside of the peripheral wall part by the outer wall part and the inner wall part extending approximately in the radial direction. As a result, the rigidity of the friction plate part is increased, and it can be used not only in the radial intermediate part connected by the peripheral wall part but also in
It is also difficult to vibrate on the outer peripheral edge side and the inner peripheral edge side, and from this point as well, the noise prevention effect is enhanced.

Moreover, ventilation holes are formed in the circumferential wall to allow ventilation from the inner circumferential side to the outer circumferential edge, and the combined wall consisting of the circumferential wall, outer wall, and inner wall increases the heat dissipation area of the disc brake rotor. Since it is also effective for cooling, the inherent cooling performance of ventilation type disc brakes can be maintained well.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a partially cutaway front view and longitudinal sectional view showing an embodiment of the present invention. FIGS. 3 and 4 are views corresponding to FIGS. 1 and 2 showing other embodiments of the present invention. 2: Disc brake rotor, 8: Inner side friction plate part, 10: Outer side friction plate part, 12, 32:
Inner peripheral edge, 14, 34: outer peripheral edge, {16, 36: peripheral wall portion, 18, 38: outer wall portion, 20, 40: inner wall portion} (joining wall), 22, 42: ventilation hole.

Claims (1)

[Scope of Claim for Utility Model Registration] The inner friction plate portion and the outer friction plate portion are designed to allow ventilation from the inner peripheral edge to the outer peripheral edge between the inner friction plate portion and the outer friction plate portion. A ventilated disc brake rotor comprising a connecting wall that connects the disc brake rotor with the disc brake rotor, wherein the connecting wall is located on one circumference around the center of rotation of the disc brake rotor at an intermediate position between the inner circumferential edge and the outer circumferential edge. a peripheral wall portion that is formed to have a ventilation hole that communicates the inner peripheral edge side and the outer peripheral edge side; an outer wall portion that extends approximately radially from the peripheral wall portion toward the outer peripheral edge side; and an approximately radial portion from the peripheral wall portion to the inner peripheral edge side A disc brake rotor for preventing noise, comprising an inner wall portion extending in the direction.