SU1399554A1 - Sealing unit - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to construction, road and lifting machines, and can be used in the working equipment of single-bucket excavators, namely hinged joints. The purpose of the invention is to improve the tightness and durability. The V-shaped cross-section of the annular cuff 5 is made of an elastic material and is mounted with tension on the shaft 1. There is a gap b between the outer diameter of the cuff 5 and the body. The end surfaces of the cuff 5 are pressed against the end surfaces of the sleeve 3 and the cover 7, and on the end surface of the cuff 5, channels for exhaust lubrication are provided on the external side of the sleeve. During wear, the coupling of the shaft 1 with the sleeve 3 of the jaws of the cuff 5 moves along the end surfaces of the sleeve 3 and the cover 7 in the radial direction. 1 hp ff, 2 ill. S

Description

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The invention relates to mechanical engineering, in particular to construction, road and lifting machines, and can be used in the working equipment of single-bucket excavators, namely, in hinged joints.

The purpose of the invention is to improve the tightness and durability of the sealing assembly by preventing axial mixing of the sleeve and at the same time ensuring radial mixing of the shaft axis relative to the axis of the sleeve.

FIG. 1 schematically shows the proposed sealing unit, a section; in fig. 2 is a view A of FIG. one.

The swivel assembly of the working equipment of the earthmoving and transporting machinery comprises a shaft 1 fixed in the frame 2 (Fig. 1), for example, a handle of an excavator boom with respect to which the sleeve 3 performs a rotational movement. The sleeve 3 is installed in the housing 4. The annular cuff 5 of elastic material has a Y-shaped cross section and is placed in a groove with a clearance of 6 relative to the housing 4. In order to remove the used lubricant, channels 6 are made on the end surface of the outer sponge of the cuff. that the sleeve 3 does not move relative to the shaft 1 in the axial direction, install the cover 7 of adjustable thickness.

The deformations that occur in a cuff that is planted with tension on the shaft, due to its K-shape, ensure that the jaws of the cuff are pressed against the end surfaces of the sleeve 3 and the cover 7 and seal the seal. In the process of wearing

The sponge shaft sleeve mates are moved along the end surfaces of the sleeve and the cover in the radial direction. The cover 7 is mounted in an annular recess of the body 4 of the sleeve along a sliding fit. The lid absorbs axial load and forms a labyrinth preventing the abrasive from entering the contact area of the jaws of the cuff with the sleeve 3 and the lid 7 and further on the surface of the shaft 1 and the sleeve 3. Periodically, the lubricant is removed under pressure through the channels on the end surface of the sleeve.

Claims (2)

1. Sealing assembly, preferably of a hinge shaft-sleeve type, comprising a housing, an annular collar mounted with a tension on the shaft, made of an elastic material, characterized in that, in order to increase tightness and durability by preventing axial movement of the sleeve and simultaneously providing a radial displacement of the shaft axis relative to the axis of the sleeve, it provided with a lid installed in the housing., and the surfaces of the sleeve, the housing and the cover. A groove is formed in which an annular cuff is placed with a gap relative to the housing and is made in a K-shaped cross section with jaws in contact with the end surfaces of the sleeve and the lid. 2. Sealing assembly according to claim I, characterized in that channels are made on the end surface of the outer lip of the cuff in order to remove the used lubricant.