JP2012007689A - Dust cover fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust cover fixture which is light in weight and has sufficient mechanical strength without a problem of adhesive peeling or defective molding.SOLUTION: The dust cover fixture 3 is embedded in a fixing part of a dust cover made of a rubber-like elastic material to fix the fixing part to a mounting member and composed of a plate-like annular base 31 and a conical tooth part 32 extending toward the mounting member, inclined to the plate-like annular base 31 from an inner peripheral edge 311 of the plate-like annular base 31. A plurality of radially elongated ribs 33 are provided with the plate-like annular base 31.

Description

The present invention relates to a dust cover fixing bracket.
The present invention also relates to a fixing bracket embedded in a dust cover so as to fix a ball joint dust cover used in an automobile suspension device, a steering device or the like to a mounting portion.

Conventionally, as shown in FIG. 6, a dust cover 100 made of a rubber-like elastic material is used to protect the swing operation portion of the ball joint 600.
An annular fixing fitting 300 for fixing the dust cover 100 to the joint socket 200 which is a mounting counterpart component is embedded in one axial end portion of the dust cover 100.

  As shown in an enlarged view in FIG. 7, the fixing bracket 300 is formed by pressing a metal plate, and is attached to the joint socket 200 on the inner peripheral edge of the annular base portion 310 bent into a substantially U-shaped cross section. A conical surface-shaped tooth portion 320 for setting a fitting margin with respect to is integrally formed.

  Further, as shown in FIG. 6, the fixing bracket 300 is disposed in a molding die when the dust cover 100 made of a rubber-like elastic body is molded, and is embedded in the dust cover 100 simultaneously with the molding of the dust cover 100. The

Further, as shown in FIG. 7, in order to form a state in which the fixing bracket 300 is completely embedded in the dust cover 100, the fixing bracket 300 is formed on the inner surface of the mold so as to make the fixing bracket 300 float. A plurality of pins for regulating the height position are provided upright.
As a result, since the dust cover 100 is molded in a state where the fixing bracket 300 is placed on the pins provided on the inner surface of the mold, when the dust cover 100 after molding is removed from the mold, the dust cover 100 A plurality of dents 1101 that are pin traces are formed on the end surface (upper and lower surfaces in the figure). (Patent Documents 1 and 2)

However, the annular base portion 310 of the fixing bracket 300 is bent into a substantially U-shaped cross section so as to ensure a predetermined strength, and thus has a volume corresponding to two layers of metal plates. For this reason, there is an inconvenience that the weight of parts as a whole of the fixing bracket 300 is heavy.
In particular, in the field of the automobile industry and other general industrial machines, weight reduction of parts is rapidly promoted, which is not preferable.

  In addition, as described above, the pins are erected in order to create a state in which the fixing bracket 300 is floated in the mold, so that the mold structure is complicated and the mold maintenance requires a lot of labor and time. is there.

  Further, in order to improve the disadvantages of this type of prior art, a fixing bracket in which the thickness of the annular base portion of the fixing bracket is made thicker than the thickness of the tooth portion 320 has been proposed. Did not come. (Patent Document 3)

  Furthermore, any conventional dust cover fixing bracket of this type has a problem in that it is difficult to secure a sufficient flow path for the rubber-like elastic material when molding the dust cover, resulting in molding defects.

  In addition, since the annular base of the fixing bracket is a simple flat plate, the adhesive cover is peeled off from the rubber-like elastic material due to the intense swinging movement of the dust cover, or the two fixing brackets overlap each other during molding This also caused the problem of being loaded into the mold.

Japanese Utility Model Publication No. 1-92518 Japanese Utility Model Publication No. 4-34510 Japanese Utility Model Publication No. 62-56866

  The present invention has been made in view of such problems, and provides a fixing bracket for a dust cover that is light in weight, has sufficient mechanical strength, and has no problems of adhesion peeling and molding defects. For the purpose.

The fixing bracket for dust cover of the present invention is embedded in the fixing portion to fix the fixing portion of the dust cover made of rubber-like elastic material to the mounting member, and is formed from a flat plate-like annular base portion and an inner peripheral edge of the annular base portion. In the dust cover fixing bracket constituted by a conical tooth portion that is inclined with respect to the annular base portion and extends toward the mounting member,
The annular base portion is provided with a plurality of radially extending ribs.

The present invention has the following effects.
According to the dust cover fixing metal fitting of the first aspect of the invention, the weight of the fixing metal fitting is light and has sufficient mechanical strength, and there is no problem of adhesion peeling or molding failure.

Furthermore, according to the dust cover fixing bracket of the invention described in claim 2, a fixing bracket having sufficient mechanical strength can be provided at a low cost while the weight of the fixing bracket is suppressed.
Furthermore, according to the dust cover fixing bracket of the invention described in claim 3, since the mechanical strength of the protruding portion on which the most deformation stress acts when fitting to the mounting member can be increased, the deformation of the fixing bracket is prevented. It can be effectively suppressed.

Further, according to the dust cover fixing bracket of the invention of the fourth aspect, the rib reinforcing effect can be exhibited to the maximum.
Furthermore, according to the dust cover fixing bracket of the invention described in claim 5, the fixing bracket can be provided at low cost.

Sectional drawing with which the dust cover by which the metal fitting for dust covers concerning this invention was embed | buried was mounted | worn with the ball joint. The three-dimensional perspective view of the fixing metal fitting for dust covers concerning the present invention. AA sectional drawing of FIG. BB sectional drawing of FIG. The figure which showed the 2nd aspect of the metal fitting for dust covers concerning this invention similarly to FIG. Sectional drawing with which the dust cover by which the fixing metal fitting for dust covers concerning a prior art was embed | buried was mounted | worn with the ball joint. The elements on larger scale of FIG.

Hereinafter, modes for carrying out the present invention will be described.
As shown in FIGS. 1 to 4, the dust cover fixing bracket 3 according to the present invention is for fixing the fixing portion 11 of the rubber elastic material dust cover 1 to a mounting member 2 such as a socket of a ball joint. Furthermore, it is embedded in the fixing portion 11 and has a flat plate-like annular base portion 31 and a conical tooth portion 32 inclined from the inner peripheral edge 311 of the annular base portion 31 to the annular base portion 31 and extending toward the mounting member 2. It is composed of.

The annular base portion 31 is provided with a plurality of ribs 33 extending radially.
As shown in FIG. 2, the rib 33 is formed from a single metal plate such as SPCC by forming the annular base 31 into an uneven shape by pressing.
Accordingly, sufficient mechanical strength can be obtained without making the annular base 31 particularly thick, so that the fixing bracket 3 can be reduced in weight and can be manufactured at low cost.
Furthermore, it is possible to avoid the problem that the two fixing brackets 3 are loaded into the mold in a state where they are overlapped during molding.

In the present embodiment, a single metal plate having a uniform thickness is manufactured by pressing. However, it is possible to provide the ribs 33 by cutting or welding, but from the viewpoint of cost and weight reduction, one sheet is used. It is preferable to manufacture from a metal plate having a uniform thickness by pressing.
Further, when the fixing portion 11 of the dust cover 1 is fixed to the mounting member 2, the tooth portion 32 is fitted to the outer peripheral surface of the mounting member 2 to prevent the dust cover 1 from being detached from the mounting member 2. Plays.

For this reason, the tooth | gear part 32 is exhibiting the cone shape extended toward the outer peripheral surface of the mounting member 2, and has a shape which converges toward the mounting side (upper side in FIG. 1).
As a result, the fixing portion 11 of the dust cover 1 is easy to insert into the mounting member 2 and exhibits an effect that is difficult to come off from the mounting member 2.

Further, the tooth portion 32 includes a notch portion 321 provided at 16 equidistant positions on the circumference and 16 protrusion portions 322 sandwiched between the notch portions 321.
Thereby, the fixing portion 11 of the dust cover 1 can be more easily inserted into the mounting member 2 and can exhibit a function that is difficult to be removed from the mounting member 2.
Note that the number of the notches 321 and the protrusions 322 is not limited to 16 and the optimum number is selected according to the application and the shape of the dust cover 1.

However, the provision of the notch portion 321 causes a problem that the mechanical strength of the tooth portion 32, particularly the strength of the projection portion 322, is lowered. In the embodiment of the present invention, the rib 33 is provided with the projection portion 322. By providing at a position corresponding to, the mechanical strength of the protrusion 322 can be increased.
In particular, by making the rib 33 extend from the vicinity of the outer peripheral edge 312 of the annular base 31 to the vicinity of the tip end 3211 of the protrusion 322, the effect of increasing the mechanical strength of the protrusion 322 can be maximized.

Next, a second aspect of the present invention will be described with reference to FIG.
FIG. 5 shows the second embodiment of the dust cover fixing bracket 3 according to the present invention in the same manner as FIG.
The difference from the first aspect described above is that a plurality of protrusions 34 (projecting downward in the figure) are provided on the annular base 31.

  Even in the case of the fixing bracket 3 of the first aspect, the flow path of the rubber-like elastic material can be secured by the unevenness provided in the annular base portion 31 without providing a pin for supporting the fixing bracket 3 in the mold, but the protrusion 34 is provided. Establishment

As a result, the flow path of the rubber-like elastic material can be ensured more reliably, and the fixing bracket 3 can be embedded in the fixing portion 11 of the dust cover 1 more completely.
By this, peeling and corrosion of the fixture 3 can be prevented more effectively.

  The material of the dust cover 1 is appropriately selected from rubbery elastic materials such as chloroprene according to the intended use.

  Further, the present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

  It can be used for a dust joint fixing bracket of a ball joint used for a suspension device and a steering device of an automobile.

DESCRIPTION OF SYMBOLS 1 Dust cover 2 Mounting member 3 Fixing metal fitting 11 Fixing part 31 Annular base 32 Tooth part 33 Rib 34 Protrusion 311 Inner periphery 312 Outer periphery 321 Notch 322 Protrusion

Claims (5)

In order to fix the fixing part (11) of the dust cover (1) made of rubber-like elastic material to the mounting member (2), it is embedded in the fixing part (11) and has a plate-like annular base part (31) and the annular part. Dust cover fixing composed of a conical tooth portion (32) inclined from the inner peripheral edge (311) of the base portion (31) to the annular base portion (31) and extending toward the mounting member (2). In bracket (3),
The annular base (31) is provided with a plurality of radially extending ribs (33), and a dust cover fixing bracket.   The dust cover fixing bracket according to claim 1, wherein the rib (33) is formed by making the annular base (31) into an uneven shape.   The tooth portion (32) is composed of a notch portion (321) provided on the circumference equally and a plurality of protrusions (322) sandwiched between the notch portions (321), The dust cover fixing bracket according to claim 1 or 2, wherein the rib (33) is provided at a position corresponding to the protrusion (322).   The dust according to claim 3, wherein the rib (33) extends from the vicinity of the outer peripheral edge (312) of the annular base (31) to the vicinity of the tip (3211) of the protrusion (322). Fixing bracket for cover.   The dust cover fixing bracket (3) according to any one of claims 1 to 4, wherein the dust cover fixing bracket (3) is formed by pressing from a single metal plate.

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