JPH043160Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to the improvement of a sealing device that is inserted between two mutually movable members to seal the inside and outside of the two members. This invention relates to a combination seal aimed at improving sealing performance.

[Conventional technology]

If a conventional combination seal of this kind is explained with reference to a drawing, as shown in Fig. 3, it consists of a first reinforcing ring 1 and a second reinforcing ring 2, which are shaped so that they can be combined with each other to form a cavity. A combination seal is constructed by disposing one or more seal lips A that come into sliding contact with a mating member.

[Problem that the invention attempts to solve]

However, since the combination seals mentioned above have no relation to each seal lip A and are arranged in the order of desired performance, it is not only time-consuming to combine them, but there is also a lot of concern that the combination may be incomplete, and during operation, the seal lips A There were serious drawbacks such as mutual interference and poor sliding contact.

In order to compensate for this drawback and increase the tension of the seal lip A, an additional garter spring or the like is added to the outer periphery of the seal lip A, resulting in an undeniable cost disadvantage.

In view of these drawbacks, the present invention provides a combination seal that realizes easy assembly and installation, and has a seal lip A with strong tension that ensures reliable sliding contact.

[Means for solving problems]

As shown in Fig. 1, the present invention is used between two members that rotate with each other, and includes a first reinforcing ring 1 that is located on the inside thereof and has a substantially L-shaped cross section, and a first reinforcing ring 1 that is located on the outside between the two members. A combination seal in which a second reinforcing ring 2 having a substantially inverted L-shaped cross section is combined, and one or more seal lips A are arranged inside the two reinforcing rings 1 and 2; A main seal lip A1 having one end connected to the circumferential inner diameter portion 1a and extending in a substantially V-shape is provided at two locations on the inner circumferential outer surface 2a and the circumferential inner surface 2b of the second reinforcing ring 2. The other second reinforcing ring 2 is provided with a substantially <-shaped sub-seal lip A2 having one end connected to the circumferential outer diameter portion 2C and the other end facing outward.
It is characterized in that it is brought into sliding contact with the outer circumferential inner surface 1b of the reinforcing ring 1.

[Effect]

The present invention has the above-described structure and achieves many excellent functions as shown below.

That is, when assembling the combination seal of the present invention, as shown in FIG. A2 has an inclined surface in the grain direction that is convenient for fitting into each other, and has a highly flexible bent shape, so it can be assembled easily and accurately, and it fits perfectly with each other's reinforcing rings 1 and 2. or contact.

This contact state is caused by the fact that the sub-seal lip A2 is formed in a substantially <-shaped shape with the tip facing outward, so it generates elasticity with a long repulsion stroke, causing vibrations, distortion, etc.
The seal shape has high contact followability against eccentricity, etc.

On the other hand, the main seal lip A1 in contact with the second reinforcing ring 2 has a unique approximately V-shape, and the tip portion 3 and the approximately V-shaped lower end portion 4 of the main seal lip A1 are brought into contact at two points. This provides a characteristic sealing effect. In other words, the main seal lip A
The feature of 1 is that one piece can continuously contact two places in the circumferential and axial directions, and by having this shape, the axial repulsive stress against the contact of the tip 3 is transferred inward to the approximately V-shaped lower end 4. This creates a strong adhesion force by converting the stress as a tension force. This action allows a strong contact force to be obtained by the main seal lip A1 itself without installing a conventionally used garter spring or C-type spring for reinforcing tension force, and the contact force is equal to the mutual contact pressure. The stronger it is, the more its effect increases.

In addition, the approximately V-shaped valley of the main seal lip A1 is designed to prevent moisture leaking from the sub seal lip A2.
A secondary effect is also created that acts as a saucer-like dam against dust, preventing further intrusion.

〔Example〕

In carrying out the present invention, the shape of the main seal lip A1 provided on the first reinforcing ring 1 can be changed depending on the required contact pressure. It is also possible to form a substantially thin irregular V-shape 5, and it is possible to set the contact pressure according to the situation.

[Effect of idea]

As explained above, the present invention simplifies the structure, dramatically improves ease of assembly and formability, and achieves high sealing force by providing strong tension without using any additives. It is an ideal combination seal.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the combination seal of the present invention. FIG. 2 is a partial sectional view showing an embodiment of the combination seal of the present invention. FIG. 3 is a sectional view showing a conventional combination seal. A1...Main seal lip, A2...Sub seal lip, 1...First reinforcing ring, 2...Second reinforcing ring, 3...Tip, 4...Substantially V-shaped lower end.

Claims (1)

[Scope of utility model registration request] A first reinforcing ring 1 located on the inside and having a substantially L-shaped cross section
and a second reinforcing ring 2 which is located on the outside and has a substantially inverted L-shaped cross section, and a seal lip A made of an elastic body is arranged inside each of the reinforcing rings 1 and 2; 1. A main seal lip A1 extending in a substantially V-shape is provided on the circumferential inner diameter portion 1a of the second reinforcing ring 1, and one end thereof is connected to the inner circumferential outer surface 2a and the circumferential inner surface 2b of the second reinforcing ring 2. On the other hand, the second reinforcing ring 2 is provided with a substantially <-shaped sub-seal lip A2 having one end connected to the circumferential outer diameter portion 2c and the other end facing outward. A combination seal characterized in that it is brought into sliding contact with the inner surface 1b of the outer peripheral part of the reinforcing ring 1.