GB2364354A

GB2364354A - Revolving shaft sealing structure

Info

Publication number: GB2364354A
Application number: GB0016607A
Authority: GB
Inventors: Chiang-Ling Chien
Original assignee: MAO SHUN OIL SEAL IND CO Ltd
Current assignee: MAO SHUN OIL SEAL IND CO Ltd
Priority date: 2000-07-07
Filing date: 2000-07-07
Publication date: 2002-01-23
Anticipated expiration: 2020-07-07
Also published as: GB0016607D0; GB2364354B

Abstract

A revolving shaft sealing structure includes a sleeve 10 sleeved onto a revolving shaft 200, a metal case 20 mounted around the sleeve, and a planar faceplace 30 fastened to the case at one side, wherein the parts of the revolving shaft sealing structure have respective elastomeric means 11, 21 of predetermined shapes, each elastomeric means having at least one lip 112, 221 pressed on another part of the revolving shaft sealing structure and wherein lubricating grease is employed to fill up the gaps in the contact area between the parts.

Description

2364354 REVOLVING SHAFT SEALING STRUCTURE

BACKGROUND OF THE INVENTION

The present invention relates to a leakage-proof sealing structure, and more particularly to a revolving shaft sealing 5 structure adapted for sealing the revolving shaft of a device.

The revolving shaft of a mechanical dev.ice is generally mounted with a sealing structure to stop lubricating oil from leaking out during rotary motion of the shaft, and to stop outside dust and solid matter from passing to the inside of the mechanical 10 device. Oil seal rings are commonly used for this purpose. However, oil seal rings cannot effectively stop internal fluid from leaking out and outside dust from passing to the inside of the mechanical device, thereby causing the internal parts of the mechanical device to be covered with rust quickly. In case the internal fluid of a 15 mechanical device leaks out during operation, an accident may occur. Further regular oil seal rings are not suitable for use in severe working environment.

SUMMARY OF THE INVENTION

It is one object of the present invention to provide a 20 revolving shaft sealing structure, which achieves satisfactory sealing effect. It is another object of the present invention to provide a revolving shaft sealing structure, which is practical for use in sever working environment. It is still another object of the present invention to provide a revolving shaft sealing structure, which is easy to install and dismount. To achieve these and other objects of the present invention, there is provided a revolving shaft sealing structure comprised of a sleeve, a metal case, and a planar 5 faceplate. The sleeve is mounted around a revolving shaft, comprising an inner end, an outer end, an- inner diameter, which receives said revolving shaft, an outer surface, a flange extending radially outward from and substantially perpendicular to the outer end, a circular elastomeric face lip extending coaxially from an 10 outer face of the sleeve flange, and an elastomeric perimeter lip extending radially outwardly from an outer end of the sleeve flange. The metal case is mounted around the sleeve, comprising an inner surface disposed in contact with the elastomeric perimeter lip, an outside surface, an outer end, an inner end, a skirt extending 15 radially outwardly from and substantially perpendicular to the outer end of the metal case, an inner flange extending radially inwardly from and substantially perpendicular to a body thereof and located between the outer end and inner end of the metal case, a stop lip, the stop lip having one end disposed in contact with an 20 outside surface of the inner flange and an opposite end disposed in contact with an inner surface of the sleeve flange, and at least one main sealing lip forced by a radial pressure into contact with the outer surface of the metal sleeve. The planar faceplate is fastened 2 to the skirt of the metal case in contact with the face lip, comprising an inner side substantially disposed in parallel to the skirt of the metal case and the flange of the sleeve and in contact with the circular elastomeric face lip, an outside surface, a hooked 5 portion extended from the periphery thereof and riveted to the skirt of the metal case, and a central aperture _greater. than the inside diameter of the sleeve.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. I is a sectional view of a revolving shaft sealing 10 structure according to the present invention.

FIG. 2 shows an application example of the present invention.

FIG. 3 is a sectional view of an alternate form of the revolving shaft sealing structure according to the present invention. 15 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1, a revolving shaft sealing structure 100 is shown comprised of a metal sleeve 10, a metal case 20, a planar faceplate 30, first elastomeric means 11 and second elastomeric means 21 respectively provided at the metal sleeve 10 and the 20 metal case 20. The sleeve 10 is preferably made of stainless steel. The first elastomeric means 11 and the second elastomeric means 21 are rubber members.

The sleeve 10 is sleeved onto a shaft 200, comprising an 3 inner end 12, an outer end 13, an inner diameter 14 adapted to receive the shaft 200, an outer surface 15, and a flange 16 extending radially outward from and substantially perpendicular to the outer end 13.

5 The first elastomeric means 11 is covered on the inside wall of the sleeve 10 around the inner diameter 14 and the outside surface of the sleeve flange 16, comprising a circular elastomeric face lip 111 extending coaxially from the outer face of the sleeve flange 16, an elastomeric perimeter lip 112 extending radially 10 outwardly from an outer end of the sleeve flange 16, two chanifered edges 113 and 114 respectively disposed at two distal ends relative to the inner end 12 and outer end 13 of the sleeve 10, and an inside annular groove 115 around the inside wall thereof between the chambered edges 113 and 114. The elastomeric face lip Ill 15 comprises two protruded portions Illa and lIlb of triangular cross section.

The metal case 20 comprises an inner surface 22 disposed in contact with the elastomeric perimeter lip 112 of the first elastomeric means 11, an outside surface 23, an outer end 24, an 20 inner end 25, a skirt 26 extending radially outwardly from and substantially perpendicular to the outer end 24, and a inner flange 27 extending radially inwardly from and substantially perpendicular to the body thereof and located between the case 4 outer end 24 and the case inner end 25.

The second elastomeric means 21 is covered on the outside surface 23 and inner flange 27 of the metal case 20, comprising a stop lip 211, a main sealing lip 212, a first dust protection lip 213, 5 and a second dust protection lip 214. The stop lip 211 has one end disposed in contact with the outside surface of the-inner flange 27, and an opposite end disposed in contact with the inner surface of the sleeve flange 16. The main sealing lip 212 is peripherally mounted with springy means, for example, an elastic band 40, 10 which imparts a radial compression force to the main sealing lip 212, causing the main sealing lip 212 to be maintained in close contact with the outer surface 15 of the metal sleeve 10. The first dust protection lip 213 and the second dust protection lip 214 extend radially inwardly from the second elastomeric means 21 15 between the stop lip 211 and the main sealing lip 212, and pressed on the outer surface 15 of the metal sleeve 10. The number of the dust protection lips 211 and 212 may be changed as desired. The second elastomeric means 21 further comprises a recessed portion 215 and a charnfered edge 216 respectively disposed at the 20 periphery corresponding to the outer end 24 and inner end 25 of the metal case 20.

The planar faceplate 30 comprises an inner side 31 substantially disposed in parallel to the case skirt 26 and the sleeve flange 16 and in contact with the circular elastomeric face lip Ill of the first elastomeric means 11, an outside surface 32, a hooked portion 33 extended from the periphery and riveted to the case skirt 26 of the metal case 20, a central aperture 34 slightly greater than 5 the inside diameter 14 of the metal sleeve 10, and a rubber ring 35 mounted around the central aperture 34. - When assembled, lubricating grease A is applied to gaps in between parts of the revolving shaft sealing structure 100.

The use and effect of the revolving shaft sealing structure 10 100 are outlined hereinafter with reference to FIG. 3. When in use, the revolving shaft sealing structure 100 is mounted in between the shell 300 and the shaft 200. The chamfered edges 113, 114 and 216 facilitate the installation of the revolving shaft sealing structure.

The inside annular groove 115 and the recessed portion 215 buffer 15 the pressure from elastomeric means 11 and 21 during installation.

Because the metal sleeve 10, metal case 20, planar faceplate 30, elastomeric means 11 and 21, lips 111, 112, 211, 212, 213 and 214, rubber ring 35 of the revolving shaft sealing structure 100 are pressed against one another and the gaps in the parts of the 20 revolving shaft sealing structure 100 is filled up with lubricating grease A, the gap between the revolving shaft 200 and the shell 300 is well sealed, outside dust is stopped from entering the control box, and inside lubricating oil is stopped from leaking out. Therefore, 6 the revolving shaft sealing structure effectively protects internal parts of the machine against oxidation and wearing, and keeps enclosed fluid from leaking out, enabling the machine to run safely.

FIG. 3 shows an alternate form of the present invention.

5 This alternate form of similar to the aforesaid embodiment with the exception of the size of the stop lip 2U1. According to this alternate form, the stop lip 211' has a relatively greater sectional area sufficient to cover over the outside surface of the inner flange 27 of the metal case 20 and the inner surface of the sleeve flange 16.

10 By means of this arrangement, the stop lip 211' stop the metal sleeve 10 from axial displacement due to the constraint of the first elastomeric means 11 during installation.

The revolving shaft sealing structure 100 is practical for use in construction and agricultural vehicles, more particularly the 15 vehicles to be used in muddy, dusty, swampy, weedy areas. The invention prevents oil from leaking out, and protects the internal parts against outside mud, dust, and weeds.

It is to be understood that the drawings are designed for purposes of illustration only, and are not intended for use as a 20 definition of the limits and scope of the invention disclosed.

7 What the invention claimed is:

1. A revolving shaft sealing structure comprising:

a sleeve mounted around a revolving shaft, said sleeve comprising an inner end, an outer end, an inner diameter, which 5 receives said revolving shaft, an outer surface, a flange extending radially outward from and substantially perpendicular to said outer end, a circular elastomeric face lip extending coaxially from an outer face of the flange of said sleeve, and an elastomeric perimeter lip extending radially outwardly from an outer end of the flange of 10 said sleeve; a metal case mounted around said sleeve, said metal case comprising an inner surface disposed in contact with said elastomeric perimeter lip, an outside surface, an outer end, an inner end, a skirt extending radially outwardly from and substantially 15 perpendicular to the outer end of said metal case, an inner flange extending radially inwardly from and substantially perpendicular to a body thereof and located between the outer end and inner end of said metal case, a stop lip, said stop lip having one end disposed in contact with an outside surface of the inner flange of said metal 20 case and an opposite end disposed in contact with an inner surface of the flange of said sleeve, and at least one main sealing lip forced by a radial pressure into contact with the outer surface of said metal sleeve; and 8 a planar faceplate fastened to the skirt of said metal case in contact with said face lip, said faceplate comprising an inner side substantially disposed in parallel to the skirt of said metal case and the flange of said sleeve and in contact with said circular 5 elastomeric face lip, an outside surface, a hooked portion extended from the periphery thereof and fastened to-the skirt of said metal case, and a central aperture greater than the inside diameter of said sleeve.

2. The revolving shaft seating structure of claim I wherein 10 said at least one main sealing lip each is respectively peripherally mounted with an elastic band, which imparts a radial compression force to the respective main sealing lip, causing the respective main sealing lip to be maintained in contact with the outer surface of said sleeve.

15 3. The revolving shaft sealing structure of claim I wherein said faceplate is made of metal, having a rubber ring mounted around the central aperture thereof.

4. The revolving shaft sealing structure of claim I wherein the hooked portion of said faceplate is riveted to the skirt of said 20 metal case.

5. The revolving shaft sealing structure of claim I wherein said metal case further comprises a first dust protection lip and a second dust protection lip extending radially inwardly between said 9 stop lip and said at least one main sealing lip and pressed on the outer surface of said sleeve.

6. The revolving shaft sealing structure of claim I wherein said circular elastomeric face lip comprises two protruded portions of triangular cross section.

7. A revolving shaft sealing structure includes a sleeve sleeved onto a revolving shaft, a metal case mounted around the sleeve, and a planar faceplate fastened to the case at one side, wherein the parts of the revolving shaft sealing structure have respective elastomeric means of predetermined shapes, each elastomeric means having at least one lip pressed on another part of the revolving shaft sealing structure and wherein lubricating grease is employed to fill up the gaps in the contact area between the parts.

8. A revolving shaft sealing structure substantially as hereinbefore described with reference to Figure 1, or Figure 3 of the accompanying drawings.