JPH0547900Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is based on a plurality of members arranged between two members such as mutually rotating bearings in order to seal the inside and outside of the space between the two members. The present invention relates to a sealing device assembly.

[Prior Art] Conventionally, this type of sealing device assembly has been constructed by combining an L-shaped seal ring B1 and an inverted L-shaped seal ring B2, as shown in FIG. One or more seal lips 3 are provided on B1 and B2 to form a sealed body B, which prevents lubricant from leaking from inside the bearing.
It was also used as a sealing material to prevent dust, muddy water, etc. from entering from the outside.

[Problems to be solved by the invention] However, such a sealing body B prevents dust, muddy water, etc. from entering from the outside into the seal lip 3.
However, when the bearing is stopped and when the bearing is started from a stopped state, the seal lip 3a has no protective means on its sliding surface, so it is easy to catch accumulated foreign matter, and when this happens, the amount of wear increases. This has the drawback that it not only increases the heat resistance but also generates heat, which has a serious negative effect on sealing performance and durability.

Further, since the sliding surface utilizes a smooth circumferential surface, the space capable of sealing is limited to the circumferential portion, resulting in poor sealing efficiency.

The present invention eliminates these drawbacks and provides a sealing device assembly that dramatically improves the sealing performance and also has a clean lip sliding section, greatly improving durability.

[Means for Solving the Problems] As shown in FIG.
A sealing device assembly A for sealing the inside and outside of the device, which comprises an annular element A1 having a substantially L-shaped cross section fixed to the inner ring 1 and an annular element A2 having a substantially L-shaped cross section fixed to the outer ring 2. , these annular elements A
A seal lip 3 formed of an elastic body a that slides on one or both of the seal lips 1 and A2 is provided, and the lip contact portion of the mating annular element A1 (or A2) with which the radial lip 3a of the seal lip 3 slides is formed into an annular groove. It is characterized by being formed into 4.

[Function] With this structure, the present invention exhibits many excellent functions as shown below.

In other words, the sealing device assembly A used here, which achieves sealing by combining multiple parts, has excellent finishing accuracy and assembly accuracy of the individual parts, and is expected to have high sealing performance due to the seal lip 3 provided inside. It is possible.

In the present invention, an annular groove 4 is formed in the sliding portion of the seal lip 3 on the other side of the radial lip 3a, as shown in FIG.・A wide narrow space is formed outside. This narrow space is a long maze-like labyrinth gap that is extremely effective for sealing, and it prevents the internal lubricant from leaking and also prevents foreign matter from entering from the outside. A reliable sealing effect can be expected.

In particular, when the annular groove 4 is combined with the radial lip 3a located on the outside as shown in FIG.
The other parts are also provided with seal lips 3, each of which performs a given function, resulting in a strong sealing performance as a whole.

[Embodiment] In carrying out the present invention, the annular groove 4 to be combined with the radial lip 3a is not limited to one location as shown in FIG. 1, but may be formed in a plurality of locations.
A desirable structure is to provide both on the circumferential surfaces in the axial direction of the annular elements A1 and A2 from the viewpoint of sealability and ease of assembly.

In forming this annular groove 4, it can be formed by engraving or pressure welding, or if a sufficient groove depth cannot be obtained, as shown in Fig. 2, both peripheral edges near the lip contact area can be formed. It can also be made to protrude to form an annular groove 4, and if the elastic body a forming the seal lip 3 is extended into the annular groove 4 and the radial lip 3a is brought into contact with this interface,
The conformability of the sliding portion is greatly improved, and the sealing force can be further increased.

[Effects of the invention] As described above, the present invention forms many labyrinth spaces to obtain low rotational torque, high sealing force, and strong durability, exhibits stable sealing performance over a long period of time, and is resistant to harsh conditions. However, it is an ideal sealing device assembly with a satisfactory sealing force.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the sealing device assembly of the present invention. FIG. 2 is an enlarged sectional view showing another embodiment of the present invention. FIG. 3 is a sectional view showing a conventional sealed body. A... Sealing device assembly, A1, A2... Annular element, B... Sealing body, a... Elastic body, 3... Seal lip, 3a... Radial lip, 4... Annular groove.

Claims (1)

[Claims for Utility Model Registration] 1. A sealing device assembly A installed between an inner ring 1 and an outer ring 2 that are movable relative to each other and sealing the inside and outside of the two members 1 and 2; A seal lip consisting of two annular elements A1 and A2 having a substantially L-shaped cross section and a substantially inverted L-shaped cross section fixed to the outer ring 2, and formed of an elastic body a that slides on one or both of the annular elements A1 and A2. 3, and an annular groove 4 is formed in the seal lip contact portion of the mating annular element A1 (or A2) with which the radial lip 3a of the seal lip 3 slides. 2. An annular groove 4 in which the radial lip 3a slides.
Utility model registration claim No. 1 characterized in that the elastic body a is extended from the inside to the contact line of the
Sealing assembly as described in Section 1.