JPS62283261A - Combined seal - Google Patents

Abstract

PURPOSE:To enable water in the inside to be promptly discharged, by forming an outer peripheral end internal shoulder part of sealing elements, which form a labyrinth clearance, into a tilt surface and performing the strong action of sealing force. CONSTITUTION:A labyrinth clearance B is formed in the outside peripheral part by the first sealing element 1 and the second sealing element 2, and an internal shoulder part of their end parts 1', 2' forms a diagonal tilt surface C. Consequently, the tilt surfaces C are constructed so as to be arranged in axial and diametric directional internal shoulder parts of the sealing elements 1, 2, and both the surfaces are formed into constitution facing diagonally to the outside. While the tilt surfaces C, which are opposed to each other interposing the labyrinth clearance B and enabling it to be widely formed, generate also the strong action of sealing. Accordingly, infiltrating water further even muddy water or the like containing a foreign material can be smoothly discharged to the outside.

Description

[Detailed Description of the Invention] 6. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an improvement in a combination seal that combines annular bodies to seal the inside and outside of two mutually rotating members. This invention relates to improving the shape of the end portion of the ring body.

[Conventional technology]

Conventionally, many combination seals of this type have been developed and put into practice, and an example of such a combination seal is as shown in FIG.
and an auxiliary ring body 5 to be combined with the ring body 4, and a combination seal D is made by either integrally caulking a part of these or by assembling them as is. At this time, if the outer ends 4' and 5' of the ring body 4.5 are crimped, they will face inward or protrude toward the inner circumference,
If it is simply assembled, it will be put into practical use with many rough parts remaining after processing.

[Problem that the invention seeks to solve]

However, the combination seal D, which is integrated by caulking,
As mentioned above, since the outer ends 4' and 5' have a dam shape that does not allow liquid to flow out from inside, if moisture enters the inside, it will remain in the combined seal part forever and weaken the sealing force extremely. There are drawbacks to this.

On the other hand, in the combination seal D' (not shown), which has a simple structure and is assembled as is after modeling, there are many rough parts such as burrs and bends at the edges, and there is moisture in the rough parts. A smooth discharge effect cannot be expected. Also,
When forming a small gap B that acts as a labyrinth seal at this end, the rough portion as described above has a major drawback in that a sufficient sealing effect cannot be achieved.

The present invention eliminates these drawbacks and provides a combination seal that has excellent sealing and drainage properties and can be formed at low cost.

[Means for solving problems]

As shown in FIG. 1, the present invention consists of a first sealing element 1 having an oval-shaped cross section, and a second sealing element 2 having an approximately ]-shaped cross section, and a plurality of elastic bodies are disposed inside one of them. A combination seal A in which a seal lip 6 is disposed and assembled to form a cavity inside; a labyrinth gap B is provided at the outer circumference.
The end portions 1' and 2' of the first sealing element 1 and the second sealing element 2 have inner shoulder portions formed into oblique inclined surfaces C.

(Function) The combination seal A of the present invention has an excellent effect of suppressing a trace amount of water that is about to enter the seal space, and yet allowing the water that has entered, as well as muddy water containing foreign substances, to be smoothly discharged to the outside. .

That is, when normally providing a discharge function to a combination seal, the labyrinth gap B on the outside side had to be widened as much as possible, knowing that the sealing force would be reduced, but in the present invention, the first
As shown in the figure, the inner shoulders 1' and 2' of the outer peripheral ends of the first sealing element 1 and the second sealing element 2, which form the labyrinth gap B, are made into inclined surfaces C, so that the muddy water inside the combination seal A is To rapidly remove moisture or foreign matter such as without reducing sealing force.

In other words, the inclined surfaces C are arranged on the inner shoulders of the axial and radial portions of the sealing elements 1 and 2, and both constitute surfaces facing diagonally outward, so rotation is applied to them. It has a shape that provides a large shake-off effect, and exhibits a high draining effect on muddy water etc. inside.

Further, the inclined surfaces C are assembled so as to face each other with the labyrinth gap B in between, so that the labyrinth gap B can be formed wide, providing a large resistance to the flow of fluid, and also exerting a high sealing effect.

〔Example〕

There are various methods for forming the inclined surface C of the present invention.
In addition to simply compressing and molding, as shown in Figure 2, there is a chamfering process Oa that shaves off the corners, which is commonly used in structures.
Alternatively, it can be formed by bending the ends 1' and 2' of the sealing element outward Ck+.Also, if the inclination angle to be formed is less than 90°, it can be formed at the required angle. It may be formed accordingly.

〔Effect of the invention〕

As explained above, the present invention has a simple structure that exerts a strong sealing force and exhibits an excellent effect of draining the moisture inside, thereby preventing the risk of moisture containing foreign substances such as muddy water from entering. This is a revolutionary combination sticker that can be used in certain locations.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a combination seal of the present invention. FIG. 2 is an enlarged sectional view showing another embodiment of the combination seal of the present invention. FIG. 3 is a sectional view showing a conventional combination seal. A... Combination seal of the present invention B... Labyrinth gap C... Inclined surface Ca... Chamfering ab...
・Bending processing 1...First sealing element 2...Second sealing element 6...Seal lip

Claims (3)

[Claims] (1) A first sealing element 1 having a substantially L-shaped cross section;
A combination seal A comprising a second sealing element 2 having a letter-shaped cross section, and a plurality of elastic seal lips 3 disposed inside one of the second sealing elements; End 1 of sealing element 1 and second sealing element 2
A combination seal characterized in that the inner shoulder portions of ' and 2' are sloped surfaces C. (2) The combination seal according to claim 1, wherein the inclined surface C is formed by chamfering Ca. (3) The inclined surface C is formed at the end 1' of the sealing element 1.2.
The combination seal according to claim 1, characterized in that the seal 2' is formed by bending Cb outward.