JPS5942512Y2 - Rust-prevention cover for disc rotor in vehicle disc brake - 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. By forming a bent path or a curved path that projects further outward than the circular arc shape, the elasticity of the rust-proof cover is improved and its assemblability is improved, and the bent path is reliably formed when removing the cover. Or it relates to something that can be torn from a curved road portion to improve its workability.

In vehicle disc brakes, the disc rotor, which 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 will be left in the open port for a while, and during this time it will be exposed to outside air containing salt. The possibility of rust occurring on the disc rotor becomes extremely large.

When rust occurs on the disc rotor, the brake pads that are pressed against it wear out quickly, and the coefficient of friction decreases, resulting in a decrease in braking performance (5 problems).

In order to prevent the occurrence of rust, it is generally considered to apply anti-rust treatment to the surface of the disc rotor, but for example, if a rust preventive agent is applied to the surface of the disc rotor, the friction coefficient of this surface becomes smaller, and the above braking force becomes insufficient.

Therefore, it is not at all desirable that the rust preventive agent still remains on the surface of the disc rotor even when the vehicle is taken ashore from a ship and delivered to a user.

On the other hand, as described above, if the rust preventive agent is removed before the vehicle is delivered to the user, there is a problem that rust will form on the surface of the disc rotor.

For these reasons, it is not usual to use rust inhibitors to prevent rust from forming on disc rotors, and as an effective alternative, conventionally,
It has been considered to cover and protect the disc rotor with a rust-proof cover.

In other words, a dust cover is generally fixed to the inside of the wheel to cover the inner surface of the disc rotor (the 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). By covering the outer surface of the disc rotor with a rust-proofing cover and removably attaching it to the outer periphery of the dust cover, the dust cover and rust-proofing cover enclose the disc rotor and prevent the free passage of outside air containing salt. By preventing distribution, the closeness of the disc rotor is suppressed.

However, the purpose of the above-mentioned anti-corrosion cover is to prevent the disc rotor from rusting during a temporary period when the vehicle is being transported by sea, and is not permanently attached to the vehicle, so it must be installed on the vehicle prior to transportation. After that, it must be removed immediately before the vehicle is delivered to the user.

For this purpose, for example, a part of the annular part of the anti-rust cover is cut out to include the outer periphery, and a slit is provided in the narrowed bridge part, so that the anti-rust cover is pulled when removed. Efforts have been made to make certain parts more susceptible to breakage, but when such slits are provided, the size generally tends to vary, so the assembly is sometimes easy to break, and there are also problems with prevention. There are inherent problems in that the rust cover does not break as intended and it takes time and effort to remove it.

In addition, the anti-rust cover is placed inside the wheel and in the narrow gap between the wheel and the disc rotor, but there are various obstructions around it, so it is difficult to get between the two. It is not easy and extremely troublesome to try to remove the anti-corrosion cover by inserting the anti-rust cover, or by climbing under the vehicle and pulling the anti-rust cover.

If the vehicle is driven under severe conditions with the anti-rust cover remaining inside the wheel without being removed or even after being removed, the heat generated by the disc rotor during brake operation will be transferred to the inside of the anti-rust cover. This causes problems such as the disc rotor overheating and reducing the braking force, and the rust preventive cover itself overheating and catching fire.

Under these circumstances, the present invention was developed in consideration of the fact that the magnitude, direction, etc. of the force applied to the bridge portion that causes the rust-proof cover to break will be different when it is assembled and when it is removed. The purpose of this is to provide a rust-proof cover that improves the ease of assembly during assembly, while being easily ruptured and extremely easy to take out during disassembly.

Briefly, in order to achieve such an objective, the present invention provides that a part of the annular part of the rust-proof cover corresponding to the caliper of the disc brake is cut out to include the outer peripheral edge part thereof, and has a narrow width. A bending path or a curved path is formed in the arc-shaped bridge portion extending along the inner peripheral edge of the rust-preventing cover, which is curved, and protrudes further outward than the arc shape so as not to interfere with the caliper. It is characterized by this.

With such a configuration, the rigidity of the rust-proof cover is reduced and its elasticity is improved, making it more easily deformed.This makes it easy to assemble the rust-proof cover, and makes it easier to assemble the rust-proof cover when removed. By applying a tensile force of a certain amount or more, the bridge portion can be easily broken at the bending or curved path portion, and therefore, the breakage point is constant, and there is no need to take time to remove it. be.

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 a 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 by bolts 5, and a bolt 7 to the hub 4.
, a caliper support 9 fixed to the knuckle 1, and a caliper fixed to the caliper support 9 and generally indicated by 10.

A pair of friction pads 12.13 are disposed between the disc rotor 6 and the caliper 10, and a piston 11 is slidably fitted to the caliper 10 to press the friction pads 12.13 against the disc rotor. has been done.

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.

Note that the 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 intake hole 15 for cooling the disc rotor 6, etc., and therefore, when the vehicle is left at a port, air containing salt is released through the outside air introduction hole 15. Outside air may enter, especially the disc rotor 6.
Rust had formed on the surface.

In order to prevent such intrusion of outside air, the anti-corrosion cover 16 is provided between the disc rotor 6 and the wheel 8 as described above, but one example of the anti-rust cover that has been used in the past is As shown in FIGS. 2 to 4, a portion corresponding to the caliper 10 is cut out to have a narrow width.

It has an arcuate bridge portion 16a extending along the inner peripheral edge of the rust-proof cover, and has a generally annular truncated cone shape with a gentle slope.

Further, this annular portion becomes a knot portion 16d.

The rust-proof cover 16 has, on its inner peripheral surface, a convex portion 16b that protrudes inward, and a back plate 17 that is attached to the outer peripheral edge side of the convex portion 16b and at a predetermined distance from the convex portion 16b. The convex portion 16b is provided with a plurality of sets (three sets in this case) of
By fitting and engaging the trough-shaped outer peripheral edge 18 of the outer peripheral part of the dust cover 14 between the back plate 17 and the back plate 17, the dust cover 14 can be removably attached to the dust cover 14.

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 anticorrosion cover 16 is generally made of synthetic resin such as polyvinyl chloride, polyethylene, and polypropylene, cardboard (impregnated with wax if necessary), or the like.

The sling t16c provided on the bridge portion 16a of the rust-preventing cover 16 is provided so that this portion is easily broken when a force is applied to the rust-preventing cover 16 in the direction shown in FIG. However, it is not easy to provide a slit 16c of an appropriate size.

In other words, if the slit N6c is made larger to make it easier to break when removed, the installation will be more likely to break even if a slight force is applied, and conversely, if the slit 16c is made smaller, the installation will be made easier even if a slight force is applied. This is because if it were to be prevented from breaking, it would be necessary to apply a large force when removing it.

Furthermore, the size of the slit 16c tends to vary when the slit 16c is provided, so the amount of force applied when removing the anti-corrosion cover 16 is not constant, and even if a predetermined force is applied, a predetermined portion may break. As a result, the removal of the anti-rust cover 16 often takes longer than expected.

In contrast, in the present invention, the bridge portion of the rust-proof cover has a completely unique shape different from that of the conventional one, as examples thereof are shown in FIGS. 5 and 6. This meant that all of the problems that had occurred could be resolved.

That is, the anti-corrosion cover 16 shown in FIGS. 5 and 6 as an embodiment of the present invention has a truncated conical, approximately circular shape, similar to the conventional one shown in FIGS. 2 to 4. exhibits a ring shape,
Three sets of convex portions 16b and back plates 17 are provided on the inner surface.

The annular narrowed portion of the rust prevention cover 16, that is, the bridge portion 24 whose width is cut out so as not to interfere with the caliper 10 when the rust prevention cover 16 is assembled is , an arc-shaped bridge base 23 similar to the conventional one extending along the inner peripheral edge of the rust-proof cover 16, and the cover 1.
6, and a bent portion 22 located outward (upper in FIG. 6) from this bridge base 23 in the approximately radial direction of the bridge base 23, and here, the bent portion 22 is located approximately from the bridge base 23 to the rust-proof cover 16. A major feature is that it has a gate-like shape (a rectangular shape with an open side on the negative side) consisting of a pair of parallel protrusions 22a that protrude in the radial direction and a connecting part 22b in the tangential direction that connects these protrusions.

Incidentally, the installation of the rust-proof cover 16 is almost the same as that shown in FIG. 1.

Therefore, in this way, the bridge portion 24 of the rust-proof cover 16
Since the bending portion (bending path) 22 is provided, for example, the inner diameter may be smaller than the outer diameter of the hub (see Fig. 1) due to a center line error, or the bending portion may come into contact with surrounding members, etc. Assembling sometimes.

Even if a force acts on the bridge portion 24 of the anti-rust cover 16 in a direction that causes it to break (in the left-right direction in FIG. Since the rigidity is low against the force in the direction of increasing the distance, and this force is usually not very large, the deformation of the rust-proof cover 16 due to the application of this force is absorbed by the elastic deformation of the bent portion 220. Therefore, there is no need to worry about the bent portion 22 being easily broken during assembly.

On the other hand, such bent portions 22 can be
By grasping the back plate 11 portion of No. 6 and applying force in the direction B in FIG. 6, it can be easily broken.

However, if a force is applied in the direction B when removing the rust-preventing cover 16, the inner circumferential portion of the rust-preventing cover 16 will come into contact with the outer circumferential portion of the hub 4 shown by the two-dot chain line in the figure, and As it is pulled out, a bending moment M is applied to both protrusions 22a of the bent portion 220 in a direction that actively widens the distance between the base parts, and as a matter of course, a tensile force is also applied, as shown in FIG. This is because the breakage occurs at at least one corner portion 25 (the connecting portion between both protruding portions 22a and the connecting portion 22b) where stress concentration is likely to occur.

Here, the shape and dimensions of the bent portion 22 are predetermined, and its strong deformation is approximately constant, so when a corresponding force is applied, it will surely break. This means that the size of the wire has almost no effect on the difficulty of removal.

Note that although the gate-shaped bent portion 22 in this example is designed to be easily broken at the corner portion 25, if necessary, as shown in FIG.
If 22c is provided, the bent portion 22 will be broken approximately symmetrically at the slit 22c portion.

Namely. Due to the presence of this sulin) 22c, stress concentration due to the above-mentioned bending moment) is likely to occur in the relevant portion.

Therefore, the slit 2 has a length that is more difficult to break than the slit formed in the bridge part of the conventional rust-proof cover.
Even if 2c is provided (assembly takes into account breakage over time)
The stress concentration makes it easy to break from the sulin (22c) portion.

In addition, in the conventional structure, such stress concentration based on the bending moment M is difficult to occur, so the dimensions of the slit provided in the bridge portion need to be controlled more strictly.

Further, in the above example, the gate-shaped bent portion 22 is formed in the bridge portion 24 to serve as a bent path, but there is no problem in forming the bent portion 22 in an inverted V-shape as shown in FIG. In addition, instead of these curved paths, for example, there may be a shape in which two parallel protrusions 22a protruding outward from the bridge base 23 are connected by an arcuate part 22d as shown in FIG. 10, or a shape as shown in FIG. Even if the bridge portion 24 is formed with a curved path, such as one in which the arc-shaped bridge base 23 is further provided with a circular arc portion 22e projecting outward, the object of the present invention can be sufficiently achieved. It is something.

Therefore, in the present invention, the shape of the bridge portion 24 preferably includes the gate-shaped portion 22, but the present invention is not limited to this in any way. Any bristles can be effectively employed as long as they have a bent or curved path that protrudes further outward from the arcuate bridge base 23 that extends in the circumferential direction at approximately the same distance as the bristles.

Further, in the above example, the protruding direction of the bent path or the curved path (gate-shaped portion 22) is approximately the radial direction of the rust-preventing cover 16; Figure 6) As long as it protrudes outward from the bridge part (base 23), the protrusion direction may be in any direction (angle) as long as it does not interfere with the caliper 10. For example, the direction of the protrusion may be in any direction (angle) It is also possible to make the bent path or curved path protrude from the bridge portion in the surface direction (conical surface direction) of the annular portion (hat portion).

Furthermore, in addition to the shape of the bridge portion as described above, the rust-proof cover according to the present invention may be provided with various measures to improve its removal workability.
The most desirable example is shown in FIGS. 12 to 15.

The rust-proof cover shown in FIG. 12 can be called an ideal rust-proof cover that satisfies all the conditions that this type of rust-proof cover is desirable to have.

That is, in FIG. 12, the rust prevention cover 16 has a gate-shaped bent portion (bending path) 2 similar to that shown in FIG.
It has a bridge part 24 having a number 2 formed therein, and has three tongue parts 20a to 20b protruding from its outer peripheral end.

Three tongues 20a, 20 protrude from the outer peripheral edge of this cover.
b is a part that is held by hand when removing the rust-proof cover 16, and thereby the rust-proof cover 16 is held and
This makes pulling and pulling operations easier.

Moreover, as shown in FIGS. 13 and 14, the largest tensile force is applied when it is gripped during tension.

At least a portion of the back plate 17a is located inside the tongue portion 20a facing the bent portion 22, so that only the tongue portion 20a portion may be damaged during such tensioning.

Moreover, the back plate 17a is attached in an inverted T-shape, and the outer peripheral edge of the dust cover is engaged between the T-shaped O leg end 17ae and the convex part 16b. , a gap 2T is created between the T-shaped head 17ah and the outer peripheral edge of the dust cover, so if the finger is placed in the gap 27.

Furthermore, the operation for removing the rust-proof cover 16 can be performed more reliably.

It should be noted that the number of such tongues is small (a small number is sufficient, and the shape of the back plate is not limited to an inverted T-shape, but can also be formed into an L-shape, a U-shape, a U-shape, etc.). A similar effect can be achieved as long as it has a shape that can be formed to serve as a finger rest.

The rust-proof cover 16 also has a bridge portion 24.
A first slit 16c is provided in the connecting portion 22b constituting the bent portion 22 of the bridge portion 24, and the first slit 16c is located between the tongue portions 20a and 20b of the hat portion 16d facing the bridge portion 24. A second slit 21 is provided in the direction.

These two slits 16c and 21 allow the cover 16 to be divided into three pieces as shown in FIG. 15 when the anti-rust cover 16 is removed, so that each divided piece can be taken out separately. As a result, the workability of taking out the material can be further improved.

These five slits H6c, 21 may be through holes or grooves, and if necessary, three or more slits may be provided in three or more pieces of the cover 1.
It is also possible to have 6 divided and taken out.

Note that the first slit 16c provided in the bridge portion 24 is inserted into the bridge portion 2 when the rust prevention cover is removed as described above.
The second slit 21 provided in the hat portion 16d is intended to allow effective stress concentration due to the bending moment (M) caused by the bridge portion 24 as described above. This is provided in order to divide the cut portion 16d into two after being broken and to facilitate pulling out from between the wheel 8, dust cover 14, and disc rotor 6.

Therefore, even if the size of the second slit 21 varies, it has no effect on the fracture of the bridge portion 24.

In this way, the anti-rust cover 16 shown in FIG.
In addition to the advantages provided by the bent portion 22, the tongue portions 20a, 20b,
The back plate 17a and the two slits t6cs 21 provide a number of advantages, and the workability of removing the cover is further improved.

Of course, it goes without saying that even if the bent portion 22 is appropriately combined with one or two of the tongue, back plate, and slit, a better effect than the bent portion alone can be obtained.

The examples given above are only some of the embodiments of the present invention, and the present invention should not be interpreted as being limited to these, and may be modified without departing from its spirit. Changes and improvements may be made as appropriate.

As described in detail above, the bent part or curved path formed in the bridge part of the rust-proof cover according to the present invention can sometimes be assembled to prevent the cover from breaking due to dimensional errors due to elastic deformation. , it has the excellent effect of easily breaking when subjected to bending moment and tensile force when removed, and is of great significance in that the workability of assembling and removing the rust-proof cover can be significantly improved. It has the following.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory diagram showing the vicinity of a disc brake with a rust prevention cover attached, Fig. 2 is a perspective view of a conventional rust prevention cover attached to a disc brake, Fig. 3 is a front view, and Fig. 4 is a front view. The figure is a view from the ■ direction in FIG. 3. 5 is a perspective view corresponding to FIG. 2 showing an embodiment of the present invention, FIG. 6 is a front view, and FIG. 1 is an explanatory diagram showing a broken state of the rust-proof cover shown in FIG. 6, 8 to 11 are partial front views showing modified examples of the bridge portion. Fig. 12 is a front view corresponding to Fig. 6 showing another embodiment of the present invention, Fig. 13 is a view taken in the direction of X in Fig. 12, and Fig. 14 is a cross section along FIG. 15 is an explanatory view showing the fracture state of the embodiment shown in FIG. 12. 1: Knuckle, 2: Shaft, 4: Hub, 6: Disc rotor, 8: Wheel, 10: Caliper 12/13:
Friction pad, 14: Dust cover, 16: Rust prevention cover,
16a bridge part, 16b: convex part, 16c=21
, 22c Nisrit, 17° 17a: Back plate, 22.22
': Bent path, 22a: Projection, 22b: Connecting portion, 23 Nibridge base, 24 Nibridge portion.

Claims (1)

[Scope of utility model registration request] The dust cover includes a dust cover that covers the inner surface of a disc rotor that rotates integrally with the wheel, and a rust-proof 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. In a disc brake, an annular part of the rust-preventing cover corresponding to the caliper of the disc brake is cut out to include the outer periphery of the annular part to narrow the inner periphery of the rust-preventing cover. A disc rotor in a disc brake for a vehicle, characterized in that an arcuate bridge portion extending along the caliper is formed with a bending path or a curved path that projects further outward than the arcuate shape so as not to interfere with the caliper. Rust-proof cover