JPH06137357A - Assembling structure of bumper bound and dust cover - Google Patents

Abstract

PURPOSE:To eliminate the necessity of press-in fixation of a bumper bound and a dust cover without easy disconnection after the assembling, and facilitate the incorporation into a piston rod. CONSTITUTION:The peripheral surface of the upper end side of a bumper bound 7 is formed with a taper part 8, of which diameter is gradually increased toward the lower, and the lower surface 91 of a fitting part 9, which is formed from the end of the taper part 8 to the inside so as to go backward, is formed on the surface crossing the rod axial direction or on the inclined surface, of which peripheral end is directed downward. A fitting recessed part 11, in which the upper end side of the bumper bound 7 is fitted, is formed inside of a dust cover 10, and this fitting recessed part 11 is formed with an inclination part 12 corresponding to the taper part 8 and a part 13 to be fitted, to which the fitting part 9 is fitted and which has a receiver surface for receiving the lower surface 91. Furthermore, the bumper bound 7 is not pressed-fit into a piston rod 3 but suspended by the dust cover 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly structure of a bumper bound provided on a rod of a shock absorber for a vehicle and a dust cover.

[0002]

2. Description of the Related Art In a conventional shock absorber 1 for an automobile as shown in FIG. 5, for example, a flexible bumper bound 100 is attached to a piston rod 3 extending from a cylinder 2 and a low axial load is applied to the shock absorber 1. It was soft and hard when subjected to high loads. A dust cover 101 is attached to the piston rod 3 in order to prevent foreign matter such as water and stones from entering the bumper bound 100. Bumper bound 100
The dust cover 101 was also press-fitted and fixed to the piston rod 3. A dish-shaped member 4 is attached to the cylinder 2, an upper sheet 5 is attached on the dust cover 101 of the piston rod 3, and a spring 6 is attached between them.

[0003]

Both the conventional bumper bound 100 and the dust cover 101 are press fitted into the piston rod 3. Therefore, the work of press-fitting into the piston rod 3 is indispensable, and the work is troublesome.

Therefore, at least the bumper bound does not have to be press-fitted and fixed to the piston rod, and the bumper bound and the dust cover can be easily assembled. An object is to provide an assembly structure of a bumper bound and a dust cover that can be easily attached.

[0005]

In order to achieve the above-mentioned object, the present invention forms a taper portion having a diameter gradually increasing downward on the peripheral surface of the upper end side of a bumper bound, and from the end of the taper portion to the inside. The lower surface of the engaging portion formed by retreating is formed on a surface orthogonal to the rod axis direction or on an oblique surface where the outer peripheral end faces downward, and the upper end side of the bumper bound fits inside the dust cover. A mating recess is formed, and an inclined part corresponding to the taper part and an engaged part having a receiving surface part for receiving the lower surface of the engaging part are formed in the fitting recess. It was hung on a dust cover without being pressed into.

[0006]

In the present invention, when the bumper bound is fitted into the fitting recess of the dust cover, the engaged portion of the dust cover is pushed into the smooth part by the presence of the taper portion, and the engaged portion is inserted after entering the smooth portion. The bumper bound is difficult to come out due to the engagement with the engaged portion and the shape of the lower surface of the engaging portion. Further, the bumper bound does not need to be press-fitted into the piston rod, and the work of attaching to the piston rod becomes easy.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the first embodiment shown in FIG. 1, a tapered portion 8 having a gradually increasing diameter is formed on the peripheral surface of the upper end side of the bumper bound 7 and the tapered portion 8 is retracted inward from the end thereof. The lower surface 91 of the formed engaging portion 9 is formed on a surface orthogonal to the rod axis direction. The bumper bound 7 is formed of urethane foam resin or the like. A fitting recess 11 into which the upper end side of the bumper bound 7 is fitted is formed inside the dust cover 10. This fitting recess 1
1. The engaged portion 13 having the receiving surface portion 92 in which the inclined portion 12 corresponding to the tapered portion 8 and the engaging portion 9 engage with each other to receive the lower surface 91
And are formed.

FIG. 2 is a cross-sectional view showing the details of the engaging portion 9 and the engaged portion 13, showing an embodiment in which the lower surface 91 is located on the surface H orthogonal to the axial direction of the piston rod 3. . It is also possible to form the lower surface 91 on the outer peripheral edge of the lower surface 91, that is, on the obliquely intersecting surface where the right end in FIG. 2 faces downward (see FIG. 3). The engagement portion 9 and the engaged portion 13 are coupled in a wedge shape, and the bumper bound 7 fitted in the fitting recess 11 is formed.
Is designed so that it will not come out easily.

In the first embodiment shown in FIGS. 1 and 2, the dust cover 10 is press-fitted and fixed to the piston rod 3, and the bumper bound 7 is not pressed into the piston rod 3 and is preferably suspended on the dust cover 10. . In order to fit the bumper bound 7 into the fitting recess 11 of the dust cover 10, the shape of the tapered portion 8 makes it easy to get over the engaged portion 13 and fit the tapered portion 8 into close contact with the inclined portion 12. The bumper bound 7 once fitted cannot be easily removed due to the engagement between the engaging portion 9 and the engaged portion 13. Further, in this embodiment, the surface facing the inside of the engaged portion 13 is formed in the plane portion parallel to the axis of the piston rod 3, in other words, the engaged portion 13 is thick,
The engaged portion 13 is less deformed, and the engaging portion 9 of the bumper bound 7 once fitted is less likely to come off. The dust cover 10 is usually made of rubber, and when the bumper bound 7 is fitted, the engaged portion 13 escapes to the outside so that the engaging portion 9 can be easily inserted.

FIG. 3 shows an example in which the outer peripheral edge of the lower surface 91 of the engaging portion 9 is oriented downward from the surface H orthogonal to the axis of the piston rod 3.

FIG. 4 shows a second embodiment of the present invention, in which a piston rod 3 is provided with a flange portion 14 and the dust cover 10 is hooked on the flange portion 14, and other configurations are the same as the first embodiment. Is the same as.

In both the first and second embodiments, the bumper bound 7 and the dust cover 10 may be adhesively fitted. Further, since the engaged portion 13 of the dust cover 10 has a certain thickness, the rigidity of the dust cover 10 is improved, and the characteristics and durability of the bumper bound 7 are also improved.

[0014]

As described above, according to the present invention, a tapered portion having a gradually increasing diameter is formed on the peripheral surface of the upper end side of the bumper bounding, and the tapered portion is formed to recede inward. The lower surface of the engaging part is formed on the surface orthogonal to the rod axis direction or on the inclined surface such that the outer peripheral end faces downward, and there is a fitting recess inside the dust cover where the upper end of the bumper bound fits. In the fitting recess, an inclined portion corresponding to the taper portion and an engaged portion having a receiving surface portion that engages with the engaging portion and receives the lower surface are formed, and the bumper bound is not pressed into the piston rod to generate dust. Since it is suspended on the cover, the bumper bound does not have to be press-fitted and fixed to the piston rod, so the pressure input at the time of assembling the mating rod is reduced and assembly workability is improved. In addition, the bumper bound is easily fitted into the dust cover, and once fitted, it is difficult to remove it. Further, the dust cover is not necessarily press-fitted and fixed to the piston rod, and the dust cover can be hooked on the piston rod.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an engaging portion.

FIG. 3 is an explanatory view showing another shape of the lower surface of the engaging portion.

FIG. 4 is a sectional view showing a second embodiment.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Shock Absorber 3 Piston Rod 7 Bumper Bound 8 Tapered Part 9 Engaging Part 10 Dust Cover 11 Fitting Recess 12 Sloping Part 13 Engaged Part 91 Lower Surface 92 Receiving Area

Claims (1)

[Claims] 1. A structure for assembling a bumper bound and a dust cover provided on a piston rod of a vehicle shock absorber or the like, wherein a taper portion whose diameter gradually increases downward is formed on a peripheral surface of an upper end side of the bumper bound, and The lower surface of the engaging part formed by retracting inward from the end of the taper part is formed on the surface orthogonal to the rod axis direction or on the oblique surface with the outer peripheral end facing downward, and the bumper bounds inside the dust cover. Forming a fitting recess into which the upper end side fits, and forming an inclined portion corresponding to the taper portion and an engaged portion having a receiving surface portion that engages with the engaging portion and receives the lower surface in the fitting recess; An assembly structure of a bumper bound and a dust cover, wherein the bumper bound is suspended in the dust cover without being pressed into the piston rod.