JPS6132175Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rust-prevention cover for a disc rotor in a vehicle disc brake, and in particular to an invention which effectively improves the ease of removing the rust-prevention cover attached to the rotor of a disc brake, while effectively maintaining the rotation-prevention function of the cover after attachment.

In vehicle disc brakes, the disc rotor that rotates integrally with the wheel is usually made of cast iron and is therefore extremely susceptible to rust. In particular, when a vehicle equipped with such a disc rotor is transported by ship to a foreign country, the vehicle is left at the port for a while, and during this time it is exposed to outside air containing salt. Therefore, the possibility that rust will occur on the disc rotor becomes extremely large. Further, there is also the problem of rust occurring when vehicles are kept in stock for a long period of time.

When rust occurs on the disc rotor, the brake pads pressed by the disc rotor wear out quickly, and the coefficient of friction decreases, resulting in a reduction in braking performance. Therefore, as an effective measure to prevent the occurrence of rust, it has been considered to cover and protect the disc rotor with a rust-preventing cover.

In other words, a dust cover is generally fixed on the inside of the wheel to cover the inner surface of the disc rotor (center side of the vehicle body), but this dust cover is used to cover the inner surface of the disc rotor (center side of the vehicle body). Alternatively, a truncated cone-shaped rust-proof cover covers the outer surface of the disc rotor and is removably attached to the outer periphery of the dust cover, thereby making it possible to protect the disc rotor. This prevents the free flow of outside air containing salt and the like, thereby suppressing the rusting of the disc rotor.

However, the purpose of the above-mentioned anti-corrosion cover is to prevent the disk rotor from rusting during a temporary period when the vehicle is being transported by sea or in stock, and is not permanently attached to the vehicle. After being installed on the vehicle prior to inventory, it must be removed just before the vehicle is delivered to the user. To this end, various improvements have been made to conventional rust-proof covers, such as making them easier to install and remove, preventing them from rattling after being installed, and preventing them from rotating. However, none of them are perfect, and for example, in the case of the one that improves the removability of the rust-proof cover, it is not possible to sufficiently prevent the cover from rotating; If a mechanism was provided to prevent the cover from rotating, there were problems such as insufficient removability of the cover.

The present invention was developed against this background, and provides a rust-proof cover that effectively prevents the cover from rotating after being installed, while significantly improving workability when removing the cover. The purpose of this is to reduce the width of the anti-corrosion cover from the bridge part, which is formed by narrowing the part of the rust-proof cover that interferes with the annular or frusto-conical floating caliper, to the outside. The bridge portion also includes a rotation preventing portion that curves and protrudes toward the disk rotor surface and extends between the two claws of the caliper and prevents rotation of the rust-proof cover by coming into contact with the claws. In addition, a slit is provided in the bridge portion where the rotation stopper is provided, and extends from the inner circumferential edge of the bridge portion toward the rotation stopper.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

First, in FIG. 1 showing a cross section around the disc brake of a vehicle, a wheel includes a knuckle 1, a shaft 2 fixed to the knuckle 1, and a hub rotatably supported by the shaft 2 via a bearing 3. 4
, a disc rotor 6 fixed to the hub 4 with bolts 5, a wheel 8 fixed to the hub 4 with bolts 7, a caliper support 9 fixed to the knuckle 1, and a caliper support 9 fixed to the caliper support 9. It has a fixed floating caliper, generally indicated at 10. A pair of friction pads 12 and 13 are disposed between the disc rotor 6 and the floating caliper 10, and the caliper 10 has the function of pressing the friction pads 12 and 13 against the disc rotor 6. The piston 11 is fitted in a sliding manner.

Therefore, when pressure fluid is supplied into the cylinder 10b formed integrally with the caliper 10, the piston 11 built therein operates to move the friction pad (inner pad) 12 to one side of the disc rotor 6. While the caliper 10 is pressed against the surface, the caliper 10 moves due to the reaction force, and the other friction pad (outer pad) 1 is moved by the claw portion 10a.
3 is pressed against the other surface of the disc rotor 6, thereby braking the disc rotor 6.

Further, a dust cover 14 is attached to the caliper support 9, and is positioned so as to face the inner surface 6a of the disc rotor 6 and cover the inner surface 6a. In addition, this dust cover 14
serves to prevent dust and the like from adhering to the surface of the disc rotor 6. On the other hand, the wheel 8 is usually provided with an outside air introduction hole 15 for cooling the disk rotor 6, etc., so that when the vehicle is left at a port, salt etc. are removed from the outside air introduction hole 15. Rust had formed especially on the surface of the disc rotor 6 due to the intrusion of the outside air.

In order to prevent such intrusion of outside air, the rust prevention cover 16 is provided between the disc rotor 6 and the wheel 8 as described above, but one example of the rust prevention cover that has been used conventionally is As shown in FIGS. 2 to 4, the bridge portion 16a is provided with a narrow bridge portion 16a that is cut out at a portion corresponding to the caliper 10, and has a generally annular truncated cone shape with a gentle slope. There is. Further, this annular portion becomes the hat portion 16d. And the rust prevention cover 16
has an engaging convex portion 16b protruding inwardly as an inner engaging portion on the inner surface facing the dust cover 14, and an engaging convex portion 16b that is closer to the outer peripheral edge than the convex portion 16b and is spaced apart from the convex portion 16b by a predetermined distance. A plurality of sets (here, three sets) of back plates (outside engaging members) 17 attached to the cover 16 (opposed to each other in the radial direction) are provided with a predetermined phase difference maintained in the circumferential direction. By fitting and engaging the trough-shaped outer peripheral edge part (curled outwardly) 18 of the outer peripheral part of the dust cover 14 between the convex part 16b and the back plate 17, the dust cover 14 is It is designed so that it can be detachably attached. Furthermore, a slit 16c is provided in the bridge portion 16a.

Note that such a rust-preventing cover 16 is attached only until the vehicle is delivered to the user, and is preferably easy to attach and detach, inexpensive, and lightweight. In consideration of these conditions, the anti-rust cover 16 is generally made of synthetic resin such as polyvinyl chloride, polyethylene, polypropylene, cardboard (impregnated with wax if necessary), or the like.

Since such a conventional anti-rust cover 16 is held simply by fitting or engaging with the outer peripheral edge 18 of the dust cover 14, it is not easily damaged by vibrations when the vehicle is running. The rust prevention cover 16 is rotated, which causes the problem of the cover 16 falling off.

In contrast, the present invention has improved the anti-corrosion cover, especially the bridge part, as shown in Figures 5 to 7, which completely eliminates the above-mentioned problems. This problem has been solved, and the ease of removal work can also be maintained satisfactorily.

That is, the anti-corrosion cover 20 shown as an embodiment of the present invention has a substantially circular truncated cone shape, similar to the conventional cover shown in FIGS. 2 to 4. . Similarly, the rust prevention cover 20
, there is a narrowed portion of the annular hat portion 21, that is, an arcuate bridge portion 22 whose width is cut out so as not to interfere with the caliper 10 when the anti-rust cover 20 is assembled. It is provided. Then, the hat portion 21 transitions to the bridge portion 22.
Flat abutting portions 23, 23 are formed at each end of the torque plate 24, and as shown in FIG. The cover 20
As shown in FIG. 1, the engagement mechanism provided inside the outer periphery of the cover 20 and the outer periphery 18 of the dust cover 14 are engaged and fitted as shown in FIG. The rust cover 20 is firmly held by the dust cover 14. In other words, the rust-proof cover 20 is attached to the dust cover 14 while undergoing elastic deformation due to the contact of the contact portion 23 with the torque plate 24, thereby completely eliminating rattling. It had become a thing. In addition, rust prevention cover 2
Although only the inner engagement protrusion 25 formed on the rust-proof cover 20 is shown here, the outer engagement member combined with the protrusion 25 is Even if the back plate (17) is rectangular as in the past,
There is no problem with an engaging member such as an inverted T-shape as described in Japanese Patent Publication No. 42511).

Then, the bridge portion 2 of the rust-proof cover 20 is
2, the bridge portion 2
A tongue-shaped detent portion 26 protruding outward from 2
is provided integrally with the bridge portion 22. More specifically, the tongue-shaped detent portion 26
The two claws 10a, 10a of the caliper 10 project outward from the bridge portion 22 at a slight angle toward the side where the hat portion 21 extends, and press the friction pad 13 as shown in FIGS. 6 and 7. The anti-rust cover 20 is prevented from rotating as a whole by abutting the side portion of the anti-rotation portion 26 with the claw portions 10a, 10a.

Furthermore, the bridge portion provided with the rotation prevention portion 26 is provided with a first slit 27 extending from the inner peripheral edge side toward the rotation prevention portion 26, thereby preventing rust as described later. cover 2
0 has become much easier to remove, and there is no longer any possibility that pieces of the cover 20 remain inside the wheel 8. This first slit 27 extends from the inner circumferential edge of the bridge portion to the curved portion of the base of the inclined protruding portion of the detent portion 26. Further, a second slit 28 for cutting the bridge is provided between the portion of the bridge portion 22 where the detent portion 26 is arranged and the hat portion 21 (abutting portion 23).

Therefore, the rust preventive cover 20 having such a configuration has the first
Dust cover 1 like rust prevention cover 16 in the figure
After being attached to the disc rotor 4 and used for rust prevention of the disc rotor 6, which is the intended purpose, it is removed before the vehicle is delivered to the customer.
The removal work is performed by removing the leg portion 2 provided so as to protrude outward from the hat portion 21 of the rust-proof cover 20.
This is done by grasping and pulling the cover 20 downward (direction A in FIGS. 1 and 5), thereby causing the cover 20 to break at the second slit 28 of its bridge portion 22. This is how it has become.

However, in order to prevent rotation of the rust-proof cover 20, if a rotation prevention part 26 is provided on the bridge part 22 that protrudes outward and comes into contact with the caliper claw part 10a, the rotation prevention part 26 will reversely prevent the caliper from rotating when removed. Once it gets caught in the claw part 10a, it becomes impossible to pull it out (see the two-dot chain line in Figure 7), and when it is forcibly pulled out, both ends of the bridge part 22 (connection part to the hat part 21: Q) are cut, and the rotation becomes impossible. Stop part 2
There is a risk that the bridge portion 22 portion including 6 may be left behind in the disc brake (wheel). According to the present invention, since a predetermined slit 27 is formed from the inner circumferential side of the bridge portion provided with the detent portion 26, the above-mentioned fear does not occur at all. A breaking load is effectively applied to the second slit 28, and after the cover 20 is cut at the slit 28, the cover 20 can be taken out of the wheel without remaining.

That is, the pulling force B acting on the arc-shaped bridge portion 22 in the arc direction causes the bridge portion 22 and the rotation stopper 26 to come into contact with the hub 4, the back surface of the friction pad 13, and the caliper claw portion 10a. , and when a further pulling force B is applied to the bridge portion 22, the bridge portion having the detent portion 26 deforms through a process as shown by the broken line in FIG. , the direction of curvature is reversed, making it easier for the bridge portion to pass through the gap between the torque plate 24 and the hub 4. More specifically, as shown in FIGS. 8 to 10 a and b, respectively, the rotation stopper 2 is in the assembled state as shown in FIGS. 8 a and b.
When the shape of the slit 27 is pulled in the left-right direction by the action of the forced pulling force B, the slit 27 opens, and then the arcuate direction of the bridge part 22 is bent at the end of the slit 27, and the slit 27 is bent in the arcuate direction of the bridge part 22. The stop portion 26 is bent (FIGS. 9a and 9b), thereby causing the curved direction of the curved portion of the base of the stop portion 26 to be reversed. This state corresponds to that in FIG. Then, by further applying the pulling force B, the detent portion 26 is significantly curved in the pulling direction as shown in FIGS. 10a and 10b, and the shape after deformation becomes smaller as a whole ( state), the degree of freedom within the wheel increases, and as a result, the breaking load (pulling force B) is effectively applied to the bridge cutting slit 28, and the cutting is ensured at this location. The bridge portion 22 does not remain inside the wheel and can be pulled out smoothly.

As described above, according to the configuration of the present invention, the rotation of the anti-rust cover 20 is effectively prevented when it is attached to the dust cover 14, while the rotation prevention mechanism ( The bridge part is effectively deformed and the breaking load is effectively applied to the bridge cutting slit 28 to cut the bridge without being adversely affected by the rotation stopper 26), and the cut bridge part is not left inside the wheel. As a result, the removal workability has been significantly improved.

Note that the present invention is by no means limited to the specific examples illustrated above, and various changes and modifications may be made based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Also,
The length and width of the slit 27 provided in the bridge portion in which the detent portion 26 is integrally formed are determined as appropriate to the extent that the deformation of the bridge portion as described above can be achieved, and may be changed as necessary. It is also possible to break the bridge portion 22 from the slit 27 so that the bridge portion 22 is divided into two.

[Brief explanation of drawings]

Figure 1 is a cross-sectional explanatory diagram of a wheel equipped with a rust-proof cover, Figure 2 is a perspective view of a conventional rust-proof cover, Figure 3 is a front view of a conventional rust-proof cover, and Figure 4 is the same as in Figure 3. It is a directional view (partial). Fig. 5 is a perspective view showing an example of the anti-rust cover according to the present invention, and Fig. 6 is an enlarged explanation of the caliper portion of the figure corresponding to Fig. 1 when the anti-rust cover according to the present invention is attached to a disc brake. Figure 7 is an X-direction view (part) in Figure 6, and a and b in Figures 8 to 10.
These are a Y-direction view (portion) in FIG. 6 showing the deformation process of the bridge portion, and -, -, - cross-sectional views at a of the same figure number, respectively. 6: Disc rotor, 8: Wheel, 10: Floating caliper, 10a: Claw, 11: Piston, 12, 13: Friction pad, 14: Dust cover, 16: Rust prevention cover, 20: Rust prevention cover,
21: hat part, 22: bridge part, 23: contact part, 26: rotation stop part, 27: first slit,
28: Second slit.

Claims (1)

[Claims for Utility Model Registration] A disc rotor that rotates integrally with a wheel, and a pair of friction pads consisting of an inner pad and an outer pad formed by a built-in piston and two claws on each surface of the disc rotor. a floating caliper that presses the two claws, a torque plate that is located below the two claws and bridged in the chord direction of the disc rotor for the outer pad, and a dust cover that covers the inner surface of the disc rotor. and an annular or truncated cone-shaped rust-preventing cover that covers the outer surface of the disc rotor and whose outer periphery is removably attached to the outer periphery of the dust cover, the rust-preventing cover comprising: curvedly protrudes outward and toward the disk rotor surface from a bridge portion formed by narrowing the annular or truncated cone-shaped portion that interferes with the caliper, and extends between the two claw portions of the caliper. A rotation stopper that extends and prevents rotation of the rust-proof cover by contacting the claw part is integrally provided on the bridge part, and a rotation stopper is provided on the inner peripheral edge side of the bridge part where the rotation stopper is provided. A rust-proofing cover for a disc rotor in a vehicle disc brake, characterized in that a slit is provided that extends further toward the rotation stopper.