JPS5910408Y2 - Bearing assembly with silver cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a bearing assembly for supporting an end of a shaft, and more particularly to a bearing assembly having a split housing and a sealing force bar following the housing for sealing a bearing held in the housing. The present invention relates to an improvement of a sealing body in a bearing assembly with a sealing force bar having a sealing body in a hole.

In this type of bearing assembly that has been known for a long time,
The seal body is made of metal and is attached to the housing with bolts, etc., or the outer periphery of the seal body is engaged with a seal groove provided on the inner surface of the hole in the sealing force bar (for example, in actual use). Publication No. 47-15878) is known, but in the former case, it is necessary to provide a plurality of screw holes in the housing, and installation of the seal body is also troublesome, and in the latter case, the seal Due to dimensional errors in the manufacturing of the outer periphery of the body and the seal groove, play may occur in the seal body after assembly, reducing the sealing performance of the fixed part, or the housing may have to be split because the seal body does not fit properly into the seal groove. There were drawbacks such as creating gaps on the surface.

This invention eliminates the above-mentioned conventional drawbacks by improving the sealing body held by the sealing force bar, and provides a bearing assembly with a sealing force bar that is easy to assemble and has good sealing performance.

Next, this invention will be explained with reference to the embodiment shown in FIGS. 1 and 2. 1 is a housing, 2 is a bearing, 3 is a support shaft, 4 is a hole, 5 is a sealing body, 6 is a sealing force bar, and 7 is a It is a seal groove.

In FIG. 1, the housing 1 has ten sides 11 including the central axis.
A support whose ends are supported by the bearing 2 in the center is on one side of the bearing 2 held in the housing 1 (the side where the support shaft 3, which will be described next, does not extend). It has a split-type sealing force bar 6 which has a hole 4 having a diameter larger than the diameter of the shaft 3 and is continuous with the housing 1 in which the hole 4 is sealed by a sealing body 5.

The inner peripheral surface of the hole 4 of the seal force bar 6 has a seal groove 7 having tapered surfaces 71 and 71 facing each other in a V-shape with a taper angle α.

As shown in FIG. 2, the seal body 5 has a closing wall 52, and the outer peripheral edge thereof is connected to the closing wall, and
A rubber-like substance having tapered surfaces 511, 511 that correspond to and closely engage with the tapered surfaces 71, 71 of the seal groove 7 at a position closer to the bearing 2 side (inner side in the axial direction) than the closing wall. The elastic enlarged portion 51 is shaped like e.

The enlarged portion 51 is provided with a seal lip 513 that is segmented by a circumferential groove 512 formed on its inner circumferential surface, and the seal lip 513 is connected to the corresponding seal groove 7 (see FIG. 2). It extends toward the bearing 2 side (inward), which has a larger angle than the taper angle α (shown by a chain line).

As mentioned above, this bearing assembly with a sealing force bar is
A split-type housing, and a split-type housing that has a hole in the center on one side of the bearing held in the housing with a diameter larger than the diameter of the support shaft, and the hole is sealed by a sealing body. A sealing force bar has a sealing force bar, and the inner circumferential surface of the hole of the sealing force bar has a sealing groove having a tapered surface facing in a V-shape, and the sealing body has a tapered surface of the sealing groove on its outer circumferential edge. Since it has an elastic bulge with a tapered surface that corresponds to and closely engages with the surface, a tapped hole in the housing is unnecessary.
The seal body is extremely easy to attach, and even if the manufacturing tolerances of the outer periphery of the seal body and the seal groove are increased, it can be easily assembled without any play.

In particular, when there is a gap between the maximum outer diameter part of the seal body and the maximum inner diameter part of the seal groove as in the embodiment, it goes without saying that the design becomes easier.
It is located on the bearing side (inner side) than the closing wall, is divided by a circumferential groove formed on the inner peripheral surface, and has a larger angle than the taper angle of the corresponding seal groove. Since the seal lip is formed with a seal lip that spreads out on both sides, during assembly, the seal lip easily bends and deforms with the circumferential groove as a boundary, making it possible to easily and reliably assemble the seal lip into the seal groove. Moreover, after assembly, it is possible to securely engage the seal groove without being affected by the machining accuracy of the seal groove, improving sealing performance, and improving the relationship with the seal lip. Therefore, there is no need to finish the seal groove and the enlarged portion with high precision, and manufacturing is easy.

In the example, the seal groove had a trapezoidal cross section and the seal body was made of rubber with a metal plate reinforcing body, but these are not limited to the above example and may be modified as appropriate within the scope of the claims. It is something.

In addition, as a matter of course, there are no particular limitations on the type of bearing, the detailed structure of the housing, etc.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of this invention, and FIG. 2 is a cross-sectional view of essential parts showing an embodiment of the seal body. In the drawings, 1 is the housing, 2 is the bearing, 3 is the support shaft, 4 is the hole, 5 is the seal body, 51 is the enlarged part, 512 is the circumferential groove, 513 is the seal lip, 6 is the seal force bar, and 7 is the seal groove. It is.

Claims (1)

[Scope of utility model registration request] A split housing and a shaft end side, which is one side of the bearing held in the housing, have a hole in the center with a diameter larger than the diameter of the support shaft, and the hole is sealed by a sealing body. In the bearing assembly with a sealing force bar, the inner circumferential surface of the hole of the sealing force bar has a sealing groove having a tapered surface facing in a V-shape. The body has a closing wall that closes the hole of the sealing force bar, and an enlarged portion made of a rubber-like material that closely engages with the sealing groove, and the enlarged portion is located closer to the bearing than the closing wall, and , a sealing force characterized by having a seal lip that is divided by a circumferential groove formed on the inner circumferential surface thereof and that widens toward the bearing side at an angle larger than the taper angle of the corresponding seal groove. Bearing assembly with bar.