JPS595253Y2 - Oil seal color - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an oil seal collar that cooperates with an oil seal to constitute a seal structure for a rotating part.

In general industrial machinery, a seal structure consisting of an oil seal 2 in contact with an oil seal collar 1 as shown in Fig. 5 is widely used to prevent oil leakage from rotating parts and to prevent foreign matter from entering from the outside. There is.

The surface of the conventional oil seal collar 1 is either polished or plated with hard chrome to further improve corrosion resistance and wear resistance. In this case, the surface roughness becomes too small and undulations remain on the surface, so after the hard chrome plating, the grinding wheel 3 is formed into a ring shape so that it is oriented perpendicular to the shaft center without being fed as shown in Fig. 1. It is said that it is most desirable to finish the outer diameter surface of the oil seal collar 1 with a grinder, but the reason why the grindstone 3 is formed perpendicular to the axis is that This is to prevent oil from leaking to the outside through the grinding wheel 3 by ensuring that the contact width a in the axial direction of the seal lip is not exceeded.

However, the grinding process for forming the grindstone mill 3 without feeding as described above has poor productivity and is therefore expensive.

In addition, if the threaded lead-shaped grindstone 4 is formed by grinding with feeding as shown in Fig. 2, each grindstone 4 will exceed the axial contact width a of the seal lip shown in Fig. 5. , oil leaks to the outside of the seal lip through this grindstone 4, which also accelerates the wear of the seal lip and reduces the interference, resulting in oil leakage or intrusion of foreign matter, resulting in an incomplete sealing effect. Therefore, in the past, there was a problem in that the grinding process without feeding as shown in FIG. 1 had to be performed.

This invention is an improvement on the above-mentioned conventional drawbacks, and the structure of this invention will be described below with reference to a specific embodiment shown in FIG. 3.

In this device, each groove of the threaded lead-shaped grindstone 6 discontinued on the outer diameter surface of the oil seal collar 5 is formed so that the groove does not exceed the axial contact width a of the seal lip in the axial direction. In order to form such an interrupted screw lead-like grindstone 6, the outside of the oil seal collar 5 is removed by a grinder process (centerless grinding) that applies a high feed rate, which is conventionally considered to be bad, as shown in Fig. 2. The radial surface is finished into a screw lead-like grindstone 4, and then the grindstone 4 is partially blinded by barrel polishing to form a grindstone 6 as shown in FIG. 3.

That is, in FIG. 3, the grindstone 6 has become smooth, and each groove of the grindstone 6 has been partially interrupted in its axial direction to a dimension not exceeding the axial contact width a of the seal lip. It is in a state.

In other words, in the barrel-ground product, the groove depth of the grinding wheel 4 shown in FIG. Since the state is partially interrupted with no dimension, oil leakage can be eliminated even when the long grindstone exceeding the axial contact width a of the seal lip of the oil seal disappears and the oil seal collar 5 rotates.

In addition, in the state shown in FIG. 4, which is a super-finished version of FIG. 2 which shows the grinder processing with feeding, the grindstones 4 and 8 whose dimensions exceed the axial contact axis a of the seal lip remain, so these grooves 4, This is not preferable because the oil that has entered the oil seal collar 8 will be carried outside as the oil seal collar rotates.

As explained above, this invention is an oil seal collar that cooperates with an oil seal to form a seal structure for a rotating part. Since each of the grooves is formed intermittently in the axial direction with a dimension that does not exceed the axial contact width of the seal lip, there is no possibility of oil leaking from the grindstone to the outside of the seal lip. Of course, it also prevents foreign matter from entering from the outside, and in particular, the above grindstone can be easily formed by performing glider finishing using the centerless method instead of the conventional plunge cut polishing method, and then closing it with barrel polishing, etc., and is highly productive. It can be processed at low cost.

[Brief explanation of drawings]

Figure 1 is a plan view of an oil seal collar with a grinding wheel applied using a conventional processing method that does not apply feed, Figure 2 is a plan view of an oil seal collar with a grinder applied using a processing method that applies Figure 3 is a plan view of an oil seal collar equipped with a grinding wheel according to this invention, Figure 4 is a plan view of an oil seal collar equipped with a super-finished grindstone after Figure 2, and Figure 5 is a plan view of an oil seal collar equipped with a grinding wheel according to this invention. FIG. 3 is a sectional view of a main part showing the relationship between an oil seal and an oil seal collar. 2...Oil seal, 1, 5...Oil seal collar, 6...Intermittent screw lead-shaped grindstone, a...Axis direction of seal lip contact width.

Claims (1)

[Scope of Claim for Utility Model Registration] Each of the grindstones in the form of an interrupted threaded lead is attached to the surface of the oil seal collar, which is in contact with the oil seal collar knob that cooperates with the oil seal to form the seal structure of the rotating part. An oil seal collar characterized in that a groove is formed intermittently in the axial direction with a dimension not exceeding the axial contact width of the seal lip.