JPS63135659A - Floating seal mechanism - Google Patents

Abstract

PURPOSE:To make a mechanical seal mechanism for a rotary machine compact, by making an one end side sealing seat ring in slide contact with the other end side seal surface of the axial end face of a bearing race. CONSTITUTION:A seal ring 4 disposed in a seat ring chamber P is pressed against the axial seal ring chamber side end face 13a of an outer race of a bearing 13 rotatably supporting a sprocket drum 16, through an O-ring 10 which is pressed by the tapered surface 8 of a sleeve part 6 of a flange 15 holding a motor 14, so as to effect sealing during the slide rotation thereof. Thus, it is possible to eliminate a seat ring for sealing one side of a conventional floating seal, and an O-ring, and therefore, the axial dimension of the floating seal mechanism may be made to be shorter. Thus, it is possible to reduce the number of required parts and to make the seam mechanism compact.

Description

[Detailed description of the invention] Demon! BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical seal mechanism that seals between two surfaces that perform relative rotational movement, a fixed part and a rotating part of a rotating machine.

Figure 2 is a partial enlarged view showing a conventional mechanical seal, which seals the relative rotation part 3 that occurs between the fixed part I and the rotation part 2, and prevents dust etc. from the relative rotation part 3. A sealing mechanism called a floating seal is used to prevent foreign matter from entering or oil leakage.

4.5 is a metal seat ring provided between the fixed part 1 and the relative rotating part 3 of the rotating part 2 supported by the radial bearing 13, and each sleeve part 6.5 of the fixed part 1 and the rotating part 2. The well-known O-rings 10 and 11 are loosely fitted into the seat ring chamber P formed by the inner diameter space portion of the seat ring chamber P and are pressed against the inner surface tapered portion 869 of the seat ring chamber P, and are pressed against each other. A space 12 between a pair of surfaces that undergoes rotational movement is sealed.

These seat rings 4 and 5 are tapered on their outer circumferential surfaces in a direction that generates an axial component force so that they approach each other relatively when pressed by the O-ring 10.11. These seat rings 10, 11 are not fixed to either side of the relative rotation part, but are only rotatably supported relative to each other via O-rings.

However, in the conventional floating seal mechanism, two seat rings are opposed to each other to perform the sealing action. Therefore, as mentioned above, a sleeve part is provided in the rotating part and the fixed part, and the inner diameter space of each sleeve is Because the seat ring chamber P is provided in the section, and the O ring and the seat ring are housed in each chamber, it is impossible to reduce the axial length beyond this point due to the design. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to solve such problems in the prior art and to provide a floating seal mechanism that is inexpensive and has a relatively short axial dimension.

1. In the present invention for divination, one of a pair of floating sheets used in a mechanical seal that seals between a pair of surfaces that rotate relative to each other is omitted, and the sealing surface of the omitted floating sheet is used instead. By using the axial end face of the bearing race that supports the rotating part, the axial length and number of parts can be reduced.

Mostly - Partly - ■ Hereinafter, the present invention will be described in detail using embodiments. The same components as those of the conventional example described above will be denoted by the same reference numerals, and a description of the structure will be partially omitted.

FIG. 1 is a sectional view showing the main parts of an embodiment of the present invention.

14 is connected to a drive motor held on a flange 15 for attachment to the frame of a construction crawler vehicle, for example.

Note that the drive motor 14 normally drives the sprocket drum via a reduction gear, but in this embodiment, the reduction gear is omitted from the drawing.

As shown in the figure, the sprocket drum 16 has a U-shaped cross section and a sprocket H7 is formed on the outer periphery of the drum, which meshes with the crawler of a construction vehicle and also serves as a protective case for the drive motor part. It is something.

The flange 15 holds the drive motor 14 by well-known means (not shown) and has a sleeve portion 6, with a tapered surface 8 formed in its inner diameter space.

The drive motor 14 held by the flange 15 is
A radial bearing 13 is provided on its outer periphery,
A sprocket drum 16 is rotatably supported via the bearing 13.

18 seals the sprocket drum 16 and the outer peripheral surface of the bearing 13 with an O-ring of a bearing race fitted into a ring groove of the sprocket drum.

Therefore, the sleeve part 6 of the flange 15 and the drive motor 14 and the radial bearing 1 for the sprocket drum
3 forms the seat ring chamber P.

The seat ring 4 in the seat ring chamber P is pressed by the tapered surface 8 of the sleeve portion 6 of the flange 15.
The ring 10 is pressed against the axial seat ring chamber side end surface 13a of the bearing race of the bearing 13, and the ring 10 slides into contact with and rotates, thereby achieving sealing.

According to the present invention, the sealing seat ring and the O-ring on one side of the floating seal can be omitted, so that the axial dimension of the structure can be shortened. Therefore, the present invention can obtain a compact sealing mechanism with a small number of parts, and also has the synergistic effect of killing two birds with one stone by using the axial end face of the bearing race as one of the sealing surfaces.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of an embodiment of the present invention, and FIG. 2 is a partially enlarged view showing a conventional mechanical seal. 4... Seal seat ring IO... 0 ring 12... Seal surface 13... Bearing

Claims (1)

[Claims] A mechanical seal that seals between a pair of surfaces that rotate relative to each other, characterized in that the sealing seat ring on one side is in sliding contact with the axial end surface of the bearing race as the other sealing surface. Floating seal mechanism.