JPH0353057Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a fixing device for fixing a dust cover used in a disc brake to a non-rotating member.

PRIOR TECHNOLOGY Generally, in a disc brake, a dust cover having a disk shape as a whole is fastened to a non-rotating member at its inner periphery by a fixing device using a screw member, and this dust cover secures the disc. The rotor is covered from one side. Problems to be Solved by the Invention However, in such a disc brake, the dust cover is vibrated relatively largely in the axial direction due to vibrations when the vehicle is running, and the dust cover is not fastened by the fixing device. There was a risk that the dust cover could be damaged at its fastening points due to excessive stress being applied to the parts.

Means for Solving the Problems The present invention was developed against the background of the above-mentioned circumstances, and its gist is to provide dust which forms a disk shape as a whole and covers a disk rotor from one side. A fixing device for fastening and fixing the inner peripheral part of the dust cover to a non-rotating member using a screw member in the cover, the screw being between the screw member and/or the non-rotating member and the dust cover. An elastic member is provided which is preloaded with a predetermined pressing force when the dust cover is fastened and fixed to the non-rotating member and can be elastically deformed in response to vibrations of the dust cover.

Operation and Effect of the Invention With this arrangement, when the dust cover is fastened and fixed to the non-rotating member by the screw member,
An elastic member is preloaded with a predetermined pressing force between the screw member and/or non-rotating member and the dust cover, and the elastic member is elastically deformed in response to the vibration of the dust cover. It is possible to prevent excessive stress from being applied to the fastened portion, and to effectively damp vibrations of the dust cover due to elastic deformation of the elastic member.
Thereby, damage to the fastening portion of the dust cover can be effectively prevented.

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

FIG. 1 is a diagram showing the main parts of a disc brake equipped with a dust cover fixed to a non-rotating member by the fixing device of the present invention. In the figure, 10 is a nut, which constitutes a non-rotating member of this embodiment. A hub 12 is supported on the knuckle 10 through a bearing (not shown) so as to be relatively rotatable around the axis, and a flange portion 14 of the hub 12 is provided with a disk rotor 16 (in this embodiment, a disk rotor 16 has a hat-like shape as a whole). A rated type disc rotor) is fixed together with a wheel (not shown) by a plurality of bolts 18 and the like. A caliper (not shown) that is supported movably in a direction parallel to the axis of the disc rotor 16 by a support member (not shown) fixed to the nutcle 10 is installed over the outer circumference of the disc rotor 16. Braking is performed by a pair of pads (not shown) disposed inside the caliper with the disc rotor 16 in between, which are pressed against both sides of the disc rotor 16 as the caliper operates. There is.

The above-mentioned nuticle 10 has a plurality of dust covers 20 each having a disk shape as a whole (in this example It is fastened and fixed with three bolts 22. That is, as shown in FIG. 3, the dust cover 20 is formed with a caliper accommodating notch 24 that opens from the inner circumferential side to the outer circumferential side.
A total of three mounting holes 26 are provided at two nearby locations and one location located intermediate in the circumferential direction between these two locations. On the other hand, as shown in FIGS. 1 and 2, female screw holes 28 into which the bolts 22 are screwed are formed in the nutcle 10 at positions corresponding to the respective mounting holes 26 of the dust cover 20. , the bolt 22 is the dust cover 20
The inner periphery of the dust cover 20 is fastened to the knuckle 10 by being inserted through the mounting hole 26 and screwed into the female threaded hole 28 .

As shown in FIG. 2, the bolt 22 has a head 30 and a male threaded portion 32 having a smaller diameter than the head 30.
and a protruding part 34 having a diameter slightly smaller than the root diameter of the male threaded part 32 and protruding from the end of the male threaded part 32 on the opposite side to the head 30 side. An O-ring 38 is interposed between the dust cover 30 and the dust cover 20 via a flat washer 36.
This O-ring 38 constitutes the elastic member of this embodiment, and when the bolt 22 is screwed into the female threaded hole 28 to a position where the protrusion 34 contacts the bottom of the female threaded hole 28, A predetermined pressing force is applied between the head 30 and the dust cover 20. This predetermined pressing force is necessary and sufficient to make the O-ring 38 elastic enough to prevent damage to the fastening portion of the dust cover 20 in response to vibrations in the axial direction of the dust cover 20 caused by vibrations when the vehicle is running. In this embodiment, the depth of the female threaded hole 28 is set from the head 30 of the bolt 22 so that the dust cover 20 can be deformed and the inner peripheral part of the dust cover 20 can be fixed to the nutcle 10 in a necessary and sufficient manner. It is predetermined based on the protrusion dimension of the O-ring 38, the wire diameter and hardness of the O-ring 38, etc.

On the other hand, FIG. 8 is a diagram showing an example of the vibration mode of the dust cover 20 fixed to a non-rotating member by a conventional fixing device that is not provided with an elastic member such as an O-ring 38, and is surrounded by a dashed line. The shaded area represents the vibration mode. In the figure, the amplitude differs greatly in the circumferential direction of the dust cover 20, and the amplitude of the part corresponding to the mounting hole 26, which is the fastening part, is large, forming a so-called annular shape, and the amplitude of each mounting hole 26 is large. The amplitude of the portion located in between becomes smaller, forming a so-called node. As a result, in the past, as the dust cover 20 vibrates, excessive stress is applied to its fastened portion, causing cracks to occur at the outer peripheral edge of the mounting hole 26, as shown in FIG. 8, for example. There was a fear. In this case, the two fastening parts on the side of the caliper housing notch 24 are usually more likely to be damaged due to the relatively small distance between both mounting holes 26 and the caliper housing notch 24. .

On the other hand, according to this embodiment, when the dust cover 20 is fastened and fixed to the nutcle 10 by the bolt 22, the O-ring 38 is placed between the head 30 of the bolt 22 and the dust cover 20 with a predetermined pressure. Since the O-ring 38 is preloaded with pressure and is elastically deformed in response to the vibration of the dust cover 20, the vibration mode of the dust cover 20 is further expanded in the circumferential direction than in the past, as shown in FIG. 3, for example. As the dust cover 20 becomes uniform, there is almost no distinction between the antinode and the node, and the amplitude decreases as a whole.
Vibration of the dust cover 20 is effectively damped due to the elastic deformation of the dust cover 8. This effectively prevents damage to the fastened portion of the dust cover 20.

Here, FIG. 4 is a diagram showing an example of the resonance characteristics of the dust cover 20 fixed to the knuckle 10 by the fixing device of this embodiment, and FIG. 3 is a diagram showing an example of resonance characteristics of the dust cover 20. FIG.
As is clear from both figures, in Fig. 4 according to this embodiment, the resonance level is reduced by about 10 dB, especially in the frequency region shown in (a) in the figure, and the sharpness of the resonance is reduced compared to the conventional one. The so-called Q value, which indicates . Incidentally, when a vibration test was conducted on the dust cover 20 fixed by the fixing device of this embodiment, it was confirmed that the durability was significantly improved by 10 to 100 times compared to the conventional one.

Further, according to the present embodiment, simply the nuts 10
There is an advantage in that the O-ring 38 can be easily preloaded with a desired pressing force by simply screwing the bolt 22 until the protrusion 34 contacts the bottom of the female threaded hole 28.

In addition, in the above-mentioned embodiment, the O-ring 3 is placed between the head 30 of the bolt 22 and the dust cover 20.
8 is interposed, but it may be interposed between the dust cover 20 and the knuckle 10, or may be provided between the dust cover 20, the head 30, and the knuckle 10, respectively.

Further, in the above-mentioned embodiment, the protruding portion 34 is provided on the male threaded portion 32 of the bolt 22;
This is not necessarily necessary, and the tip of the male threaded portion 32 can be inserted into the female threaded hole 28 without providing such a protruding portion 34.
It may be made to come into direct contact with the bottom of the.

Further, the elastic member may be, for example, a spring member 40 bent from a spring steel plate as shown in FIGS. 5 and 6, or a compression coil spring 42 as shown in FIG. It's okay. In these cases as well, the spring member 40 and the compression coil spring 42 are preloaded with a predetermined pressing force, and the contact portions of the spring member 40 and the compression coil spring 42 with the dust cover 20 are both curved. By doing so, damage to the fastening portion of the dust cover 20 is effectively prevented.

In addition, in the above-mentioned embodiment, the nutkl 10
Although the male threaded portion 32 of the bolt 22 is configured to be screwed into the female threaded hole 28 formed in the nut, it is not necessary to do so, and the male threaded portion 32 is inserted into the through hole formed in the nutcle 10 and the nut is screwed into the female threaded hole 28 formed in the nut. It may be configured such that the two are screwed together,
Alternatively, it may be configured such that a predetermined female screw member is screwed into a male screw portion protruding from the knuckle 10. In these cases,
The bolt 22 and the nut or the female threaded member correspond to the threaded member in the claims; In this case, an elastic member is provided between the female thread member and/or the knuckle 10 and the dust cover 20.

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 partially sectional view showing the main parts of a disc brake equipped with a dust cover fastened to a non-rotating member by the fixing device of the present invention. FIG. 2 is an enlarged view of the main part of FIG. 1. FIG. 3 is a reduced view of the dust cover of FIG. 1 viewed from the disk rotor side, and is a diagram showing an example of its vibration mode. FIG. 4 is a diagram showing an example of the resonance characteristics of the dust cover shown in FIG. 1. Fifth
This figure shows another example of the present invention, and corresponds to FIG. 2. 6 is a plan view of the spring member of FIG. 5. FIG. FIG. 7 is a diagram showing still another example of the present invention, and corresponds to FIG. 2. 8th
This figure is a diagram showing an example of the vibration mode of a dust cover fastened to a non-rotating member by a conventional fixing device, and corresponds to FIG. 3. FIG. 9 is a diagram showing an example of the resonance characteristics of the dust cover of FIG. 8, and corresponds to FIG. 4. 10...Natsukuru (non-rotating member), 16...Disc rotor, 20...Dust cover, 22...
Bolt (threaded member), 28... Female threaded hole, 30...
... Head, 32 ... Male thread part, 38 ... O ring (elastic member), 40 ... Spring member (elastic member), 4
2... Compression coil spring (elastic member).

Claims (1)

[Claims for Utility Model Registration] (1) In a dust cover that is disk-shaped as a whole and covers a disk rotor from one side, the inner circumference of the dust cover is fastened to a non-rotating member using a screw member. A fixing device for fixing, wherein a predetermined pressing force is applied between the screw member and/or non-rotating member and the dust cover in a state where the dust cover is fastened and fixed to the non-rotating member by the screw member. 1. A fixing device for a dust cover for a disc brake, characterized in that an elastic member is provided which is preloaded with an elastic member and can be elastically deformed in response to vibrations of the dust cover. (2) The threaded member is a bolt having a head and a male threaded portion, and the non-rotating member is formed with a female threaded hole into which the male threaded portion of the bolt is screwed, and the depth of the female threaded hole is When the bolt is screwed together to a position where the tip of the bolt contacts the bottom of the female threaded hole, the elastic member is preloaded with the predetermined pressing force between the head of the bolt and the dust cover. A fixing device for a dust cover for a disc brake as set forth in claim 1 of the utility model registration claim, wherein the dimensions are determined.