JPS621502Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a dust cover device for a joint mechanism such as a ball joint, and the present invention relates to a dust cover device for a joint mechanism such as a ball joint. The present invention relates to a dust cover device.

Conventionally, as this type of dust cover device, the one shown in FIG. 1 has been known, and a small hole 2 is provided in the upper end of the dust cover 1 to enable grease removal, but a grease filling device Air and grease flowing out from inside the dust cover 1 through the small hole 2 during grease replacement by the annular raised portion 4 provided at the opposing portion with the mounting ring 3 serving as the mounting support member.
Air and old grease do not easily flow out into the atmosphere due to the rigidity of the dust cover 1, increasing the internal pressure of the dust cover 1.
This was also a cause of abnormal deformation and breakage of the bellows portion, which is the center of the dust cover 1.

The present invention was developed by focusing on these conventional problems, and includes forming an annular oil groove on the underside of the retaining ring embedded in the fitting part of the ball joint socket at the bottom of the dust cover. A grease passage is formed by communicating this annular oil groove to the atmosphere through the through hole of the retaining ring and the slit of the dust cover, and when replacing the grease, the air and old grease are removed while maintaining the internal pressure of the dust cover constant. , the purpose is to make it easier to replace grease using a grease filling device.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 2 is a sectional view showing an embodiment of the dust cover according to the present invention. First, to explain the structure, the dust cover 10 has an upper fitting part 10a that fits with a ball stud, a boot part 10b provided in the center, and a lower fitting part 10c that fits into a ball joint socket. A metal mounting ring 11 is embedded inside the upper fitting part 10a, and a metal mounting ring 11 is embedded in the lower fitting part 10c for fitting into a ball joint socket. A retaining ring 12 is embedded therein. In the dust cover 10 having such a structure, in order to form a grease passage, an annular groove 13 is formed on the inner periphery of the lower part of the retaining ring 12 embedded in the lower fitting part 10c. provided, this annular groove 1
A predetermined number of communication holes 14 are formed at the locations of the retaining ring 12 corresponding to the positions 3, and slits 15 are formed in the part of the dust cover 10 facing the communication holes 14.
is formed, and has a passage consisting of an annular groove 13, a communication hole 14, and a slit 15, so that the inside of the dust cover 10 can be communicated with the atmosphere.

FIG. 3 shows a plan view of the slit 15 shown in FIG. 2, and shows a slit 15 having a predetermined width in the circumferential direction at a position opposite to the annular groove 13 and the communication hole 14 shown by broken lines. is formed.

FIG. 4 is an explanatory diagram of a ball joint using the dust cover of the present invention shown in FIG. 2. First, to explain the configuration, the spherical part of the ball stud 16 is rotatably supported inside the ball joint socket 17 by the interposition of ball seats 18 and 19 divided into upper and lower parts.
is fitted into the nutcle arm 20 and tightened with a nut 21. On the other hand, the ball joint socket 17 is fitted into and fixed to the transverse link 22, and an end cover is provided at the bottom of the ball joint socket 17. 23 is fitted, and a spring 24 provided inside the end cover 23 causes the lower ball seat 1 to
9 is pushed up to give a preload to the spherical part of the ball stud 16. Also, end cover 23
A grease inlet 25 is provided at the center of the lower end surface of the holder, and is closed by a bolt 26.

In a ball joint with this structure,
The dust cover 10 of the present invention has an upper fitting portion 1
0a is fitted into the ball stud 16 by caulking the mounting ring 11, and the lower fitting part 10c is fitted into the upper end of the ball joint socket 17 with a retaining ring 12.

Next, the effect will be explained.

In normal use, as shown in FIG. 4, the inner peripheral surface of the lower fitting part 10c of the dust cover 10 that is above the retaining ring 12 is flush against the ball joint socket 17. Even if the boot portion 10b of the dust cover 10 expands or contracts due to movement of the ball stud 16 in the axial direction due to vibration or the like, the lower fitting portion 10c remains securely in contact with the ball joint socket 17. , water, dust, etc. do not enter the inside of the dust cover 10 through the slit 15, the communication hole 14, and the annular groove 13.

On the other hand, during vehicle inspection etc., the end cover 23
If the bolt 26 screwed into the ball joint 1 is removed and grease is press-fitted from the grease inlet 25 using a grease filling device, the ball joint 1
The old grease contained inside the dust cover 7 was pushed out into the dust cover 10, and as a result, the internal pressure of the dust cover 10 increased, and as shown in Figure 5, they were in contact as shown by the broken line. The surface contact state of the dust cover 10 is pushed out as shown by the solid line due to the increase in internal pressure, and the ball joint socket 17 and the dust cover 10 that are formed in this way are
The annular groove 13 of the dust cover 10 passes through the gap.
A passage is formed in the dust cover so that the air and old grease inside the dust cover are discharged from the annular groove 13 to the communication hole 14 of the retaining ring 12 and further to the outside through the slit 15 provided on the outside of the dust cover. Become. In addition, in the state shown in Fig. 5, the retaining ring 1
The ball joint socket 17 of the retaining ring 12 is shown as being in contact with the outer periphery of the ball joint socket 17 and blocking the passage from the inside of the dust cover 10 to the annular groove 13. The fitted state of the ball joint is not completely tight around the entire circumference, and there is always a slight gap, so even if the retaining ring 12 is interposed, the retaining ring 12 and the ball joint Air and old grease within the dust cover are easily pushed out against the annular groove 13 through the gap with the butt 17.

In the above embodiment, the annular groove, communication hole, and slit are provided in the lower fitting part of the dust cover 10 to form a grease passage, but the upper fitting part of the dust cover 10, that is, the ball stud Similar effects can be obtained by providing an annular groove, a communication hole of the attachment ring, and a slit that connects the communication hole of the attachment ring to the outside in the fitting portion.

As explained above, according to the present invention, a ball stud fitting part is formed in the upper part, and a fitting part with a ball joint socket is formed in the lower part following the central cylindrical boot part. In a ball joint dust cover device that has a dust cover and a metal retaining ring embedded in the fitting part at the bottom of the dust cover, an annular oil groove is provided below the retaining ring. At the same time, a predetermined number of communication holes are provided in the retaining ring that communicate with this oil groove, and a communication passage made of a slit or the like is provided at the bottom of the dust cover to connect the communicating hole of the retaining ring to the atmosphere, so that it is easier to replace the grease when replacing the grease. When the pressure inside the dust cover reaches a predetermined value, the deformation of the dust cover forms a passage for the annular oil groove, allowing air and old grease to be pushed out while keeping the internal pressure of the dust cover constant. or,
Grease removal hole consisting of an annular oil groove, communication hole and slit is provided in the lower fitting part of the dust cover where the boot part is removed, which is the center of the dust cover, that is, in the fitting part with the ball joint socket, making it easy to remove grease. Even if holes are provided, the effect of sufficiently increasing the mounting strength of the dust cover can also be obtained.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional dust cover.
Fig. 2 is a sectional view showing one embodiment of the dust cover of the present invention, Fig. 3 is a plan view showing the slit forming portion of Fig. 2, and Fig. 4 is a cross-sectional view showing an embodiment of the dust cover of the present invention. Ball joint and explanatory diagram, 5th
The figure is an explanatory diagram showing the operation of the present invention. DESCRIPTION OF SYMBOLS 10... Dust cover, 10a... Upper fitting part, 10b... Boot part, 10c... Lower fitting part, 11... Mounting ring, 12... Retaining ring, 13... Annular groove, 14... Communication hole, 15...
Slit, 16... Ball stud, 17... Ball joint socket, 18, 19... Ball seat, 20... Nuttle arm, 21... Nut, 22... Transverse link, 23... End cover, 24... Spring, 25... Grease inlet, 26... Bolt.

Claims (1)

[Scope of Claim for Utility Model Registration] A rubber dust cover that has a fitting part with a ball stud in its upper part and a fitting part with a ball joint socket in its lower part following the central cylindrical boot part. In a ball joint dust cover device having a metal retaining ring embedded in the fitting portion of the lower part of the dust cover, an annular groove is provided below the retaining ring, and A dust cover device for a ball joint, characterized in that a retaining ring is provided with a predetermined number of communicating holes that communicate with the groove, and a communicating path is provided in the lower part of the dust cover that connects the communicating holes of the retaining ring to the atmosphere.