JPH0453469Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a disc rotor for a disc brake, and in particular, to prevention of squeal.

2. Description of the Related Art A disc rotor for a disc brake is equipped with a disc-shaped braking part having a center hole, and rotation is suppressed by sliding brake pads on the braking part. Disc brakes equipped with such a disc rotor may produce an unpleasant noise (squeal) during braking.The cause of this is that the brake components such as the brake pads and calipers are damaged when the brake pads are in sliding contact with the disc rotor. It is believed that this is due to resonance.

Japanese Utility Model Application Publication No. 54-52576 describes that a squeal prevention ring (hereinafter referred to as ring) is attached to the disk rotor to suppress the vibration of the disk rotor and reduce the occurrence of squeal. . The ring is formed in an annular shape from a material having elastic deformability, such as metal, and is attached to the outer periphery of the disc rotor braking part so as to elastically tighten the braking part. A ring attached in this way is
When the disc rotor vibrates, it frictionally engages with the disc rotor due to its elastic force and vibrates separately from the disc rotor, causing minute relative vibrations between the ring and the disc rotor, converting kinetic energy into thermal energy. This dampens the vibrations of the disc rotor and reduces noise.

Problem to be Solved by the Invention However, for example, when forming a simple circular ring using metal wire and tightening the outer periphery of the disc rotor under a condition where a predetermined tension is generated, it is necessary to create an appropriate gap between the ring and the disc rotor. It is difficult to maintain frictional force. In order to obtain the anti-squeal effect, it is necessary to cause the ring and disc rotor to vibrate relative to each other under appropriate frictional force. This is because the tension varies greatly due to the difference in thermal expansion with the disc rotor.

Furthermore, it is difficult to prevent a simple circular ring from rotating relative to the disk rotor, and wear due to relative rotation is severe, and proper frictional force is likely to be lost due to this wear as well.

The present invention has been made with the object of providing an anti-squeal disc rotor that can solve all at once the problems of the excessive elastic modulus of the anti-squeal ring and the relative rotation with respect to the disc rotor.

Means to solve the problem And the gist of this invention is that the disk rotor
The brake part is of a ventilated type with multiple ventilation holes passing through it in the radial direction, and
The anti-squeal ring has at least one convex portion where a portion corresponding to at least one of the plurality of ventilation holes is curved convexly toward the center of the brake part, and the anti-squeal ring is attached to the disc rotor. The second feature is that the convex portion engages with each partition wall forming the ventilation hole to prevent relative rotation with respect to the disk rotor.

In addition, if the disc rotor has a plurality of ventilation holes formed at equal angular intervals, the convex portions may be formed at angular intervals that are an integral multiple or a fraction of the angular interval at which the ventilation holes are formed. . In addition, if the ventilation holes are formed at unequal angular intervals rather than at equal angular intervals, and if the ring has one convex part for one ventilation hole, the convex part If the ring is provided to engage with the partition wall forming the hole, and if the ring has a plurality of convex portions for one ventilation hole, among the convex portions, in the circumferential direction of the disc rotor, The convex portions at both ends are provided so as to engage with the partition walls, respectively.

Function and Effect The ring is extended from the state before being attached to the brake part and is attached to the outer periphery of the brake part,
The convex portion is fitted into the ventilation hole. The convex portion is formed to be located within the ventilation hole when the ring is attached to the brake portion, and engages with the partition wall to prevent relative rotation with the disc rotor.
Therefore, there is less wear on the ring, and good anti-squeal effects can be obtained over a long period of time.

In addition, since the convex part deforms elastically relatively easily when tension is applied to the ring, the elastic modulus of the entire ring decreases, and it is easy to attach it to the disc rotor while generating an appropriate tension. Ring manufacturing errors are absorbed. Therefore, an appropriate frictional force is maintained between the ring and the partition wall, and when the disc rotor vibrates, the disc rotor and ring repeat minute relative vibrations under this frictional force, causing the disc rotor to vibrate. Vibrations are attenuated and the occurrence of squeals is reduced.

Furthermore, the presence of the convex portion increases the elastic deformability of the ring, which has the advantage that stress changes during heating and cooling can be reduced. The disc rotor and ring are heated and cooled by repeated braking, but the state of temperature change is not necessarily the same for both, resulting in a difference in the amount of thermal expansion. At this time, if there were no convex parts and the elastic deformability was small, stress exceeding the elastic limit would be applied to the ring, causing it to break or be plastically deformed, but this ring has a large elastic deformability. Such a situation does not occur, and the braking section can be kept elastically tightened with an appropriate tension at all times.
In addition, since the ventilation hole is provided through the brake part, the height of the convex part (dimension in the radial direction of the brake part) is not limited, and the elastic deformability of the ring can be freely set.

As described above, in the present invention, the ring has a convex portion, and is attached to the disk rotor so that it cannot rotate relative to the ring using the ventilation holes and partition walls, which are essential components in a ventilated disk rotor. Furthermore, since the curved convex portion has the effect of increasing the elastic deformability of the ring, it is possible to create a low-cost disc rotor that has a long ring life and always provides a good squeal prevention effect regardless of temperature changes. and can be easily obtained.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 2, numeral 10 indicates a rotor body of a disc rotor which is an embodiment of the present invention. The rotor body 10 includes a bottomed cylindrical portion 12 and a cylindrical portion 1 thereof.
The flange portion 14 extends outward in the radial direction from the open end of the flange portion 2, and is cast from gray cast iron (JIS FC20). Bottomed cylindrical part 1
2 is fitted into the boss part of the axle hub in the fitting hole 16 formed at the bottom thereof, and the flange part 14
is sandwiched by the friction members from both sides in the direction of the rotor's rotational centerline, and its rotation is suppressed, thereby functioning as a braking section.

The flange portion 14 has a disk shape with a center hole, and a plurality of ventilation holes 18 passing through the flange portion 14 in the radial direction are formed at equal angular intervals, and adjacent ventilation holes 18 are separated by the partition wall 22. It is partitioned off. Grooves 26 having a semicircular cross section are formed in the outer peripheral end surface of each partition wall 22, and squeal prevention rings 28 are fitted into these grooves 26. The ring 28 is elastically deformable and is formed of a metal wire with a circular cross section.
4, the diameter is slightly larger than that shown in Figure 1, and it forms a circular ring that is open at one point.After fitting it into the groove 26 while pulling it in the circumferential direction, both ends are welded. are combined to form a circular ring. This ring 28 has convex portions 30 formed by convexly curving toward the center of the rotor at portions having an angular interval that is an integral multiple (1 times in this embodiment) of the angular interval at which the ventilation holes 18 are formed in the attached state. has been done. These convex portions 30
is formed to have a length shorter than the circumferential dimension of the ventilation hole 18 before the ring 28 is attached to the flange portion 14, and is stretched to a length that is approximately equal to the circumferential dimension of the ventilation hole 18 in the attached state. 2 that fit into the ventilation holes 18 and form each ventilation hole 18.
It is in a state where it engages with each partition wall 22. Therefore, the ring 28 elastically tightens the flange portion 14 with the elastic force based on the stretching of the convex portion 30.

In the disc rotor configured as described above, the friction member contacts the flange portion 14 during braking, and when the disc rotor vibrates together with the friction member and brake component members such as the caliper, the ring 28 moves toward the flange portion 14 (partition wall 22). ) and vibrates while engaging with the appropriate frictional force, causing the flange portion 14 and ring 28 to
A minute relative vibration is generated between the disc rotor and the disc rotor, thereby damping the vibration of the disc rotor. Further, the ring 28 has the convex portion 3
0 and the partition wall 22 prevents relative rotation with respect to the flange portion 14, resulting in less wear and vibration damping effect over a long period of time.

In the above embodiment, the ring 28 had the convex portion 30 at a portion that is one times the angular interval between the ventilation holes 18, but it has a convex portion 30 at a portion that is three times the angular interval of the ventilation holes 18, as in the ring 34 shown in FIG. one protrusion 3 on each
6.

Further, in addition to a portion that is an integer multiple other than 1 or 3 times the ring, a portion that is an integer fraction may be used as a convex portion. In the latter case, a plurality of protrusions will fit into one ventilation hole.

Furthermore, in the above embodiment, the ring 28 is
6, both ends were joined by welding, but by reducing the depth of the groove and the height of the convex part (dimension in the radial direction of the rotor),
The ring may be joined in advance by welding and then fit into the groove while being elastically deformed. Also,
A convex portion is provided on the outer periphery of the rotor braking portion between the convex portions to increase the elastic deformability of the ring, and after the ring is joined by welding, the ring can be elastically deformed and fitted into the groove. Good too.

Further, in the above embodiment, the ring 28 was fitted into the groove 26 formed in the partition wall 22, and the position in the rotor axial direction was accurately determined, but the provision of the groove is not essential. The partition wall 22 is normally provided at a position recessed toward the center from the outer peripheral surface of the flange portion 14, and by using this recessed portion as a groove, the groove can be omitted.

Furthermore, although the cross-sectional shape of the ring is circular, it may also be rectangular.Furthermore, it is not limited to metal, but may be made of other materials such as synthetic resin or composite material as long as it has elastic deformability and heat resistance. You can also use

In addition, the disk rotor of the above embodiment has a ventilation hole 1.
Although the ventilation holes 8 are formed at equal angular intervals, the present invention can also be applied to a disc rotor in which a plurality of ventilation holes are formed at unequal angular intervals.

Although not illustrated in detail, the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a cross section of a flange portion of a ventilated disk rotor according to an embodiment of the present invention. FIG. 2 is a side sectional view of the disc rotor. FIG. 3 is a front view showing a part of the flange portion of the ventilated disk rotor in section, to which a different type of anti-squeal ring is attached. 10... Rotor body, 14... Flange portion, 1
8... Ventilation hole, 22... Partition wall, 28... Squeal prevention ring, 30... Convex portion, 34... Squeal prevention ring, 36... Convex portion.

Claims (1)

[Claims for Utility Model Registration] A state in which a disc-shaped brake part with a center hole is provided, and a ring-shaped anti-squeal ring made of an elastically deformable material around the outer periphery of the brake part elastically tightens the brake part. In the disc rotor that is attached to the disc rotor, the disc rotor is of a ventilated type in which a plurality of ventilation holes are formed that penetrate the braking part in a radial direction, and the anti-squeal ring is attached to one of the plurality of ventilation holes. The anti-squeal ring is attached to the disc rotor, and the anti-squeal ring is attached to the disc rotor.
A ventilated disk rotor with anti-squeal characteristics, characterized in that the convex portion is attached in such a manner that it engages with each partition wall forming the ventilation hole to prevent relative rotation with respect to the disk rotor.