JPH06313436A - Seal for roller bearing - Google Patents

Abstract

PURPOSE: To provide seal for a rolling bearing easily manufactured at low cost, being light-weight, and prevented from causing permanent deformation, thermal expansion, etc., under a high temperature. CONSTITUTION: This seal 5 for a rolling bearing comprises a circumferential part of a relatively soft elastic synthetic plastic material and a relatively hard intermediate part. This seal is so formed that the intermediate part has a stiff annular insert formed of synthetic plastic polymer, the relatively soft elastic synthetic plastic circumferential part is simultaneously molded with the annular insert, the circumferential part is fixed to a first circumferential outer end 11 and a second circumferential inner end 12 of the annular part respectively, and the circumferential part is formed of mixture between elastomer and the synthetic resin polymer same as the material used for forming the annular insert.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a rolling bearing seal.

[0002]

2. Description of the Related Art In order to protect a rolling element of a rolling bearing, a rubber or metal seal having a strong support at the center and soft seals on both sides is mounted between rings.
The inner side of the seal is a labyrinth seal and the outer side is a static seal connecting the inner seals. A synthetic resin material is used as a sealing member that forms a strong support at the center. However, these materials are damaged by heat during use or are permanently deformed and the inner side of the sheet is crushed, and one of the sheets is lost during cold weather, and in any case, an effective sealing action cannot be obtained.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to obtain an inexpensive and easy-to-manufacture seal for a rolling bearing, which is lightweight and does not cause permanent deformation thermal expansion at high temperatures.

[0004]

Simultaneous molding with an annular insert and a relatively stiff intermediate portion having a perimeter of a relatively soft elastic material and a tough annular insert formed from a synthetic plastic polymer. And a peripheral portion of a relatively soft elastic synthetic resin material, the peripheral portion being a first portion of the annular insert.
The problem is solved by a seal fixed to the outer edge of the peripheral part and the inner edge of the second peripheral part, respectively, and formed from a mixture of an elastomer and a synthetic resin polymer of the same material forming the annular insert.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 in FIG. 1 denotes an outer ring 2, an inner ring 3, and a plurality of balls 4 provided between the outer ring 2 and the inner ring 3 (only one ball is shown in the figure for simplicity). ) And at least one seal 5 between the rings 2 and 3 for protecting the balls 4 is shown in its entirety. Although not limited to the one shown, the seal 5 has a relatively soft outer elastic seal member 6, 7 and a relatively stiff intermediate member 8 connecting the members 6, 7. According to the invention, the intermediate member 8 has one tough annular insert made of plastic and, on both sides, an independent peripheral part formed simultaneously with the members 6, 7. More specifically, the peripheral portions of the members 6, 7 are preferably made of individual components, such as the first peripheral edge 1
1 and a second inner peripheral end 12 which form the intermediate member 8 from a mixture of elastomer and synthetic plastic polymer of the same material. The intermediate member 8 in the present invention is preferably formed from one of the group of synthetic plastics including polypropylene, polyamide, polyethylene. On the other hand, the members 6 and 7 are made of EPD in addition to the above materials.
M-based trefsin (TREFSIN, registered trademark), Santoprene (SANTOPREN, registered trademark), nitrile rubber (NBR) -based geolast (GEOLAST, registered trademark), Kelprox (KELPROX, registered trademark) EPDM It is preferable to be selected from the group including VESTOPREN (registered trademark) and Telcar (registered trademark) and FKM-based materials manufactured by 3M, which are not yet trade names. The intermediate member 8 has a hollow cross section in the radial direction, and has projections 13 and 14 at both ends 15 and 16 at the long side end portions 17, respectively,
The peripheral portions of the members 6 and 7 are fixed to the first outer peripheral end 11 and the second inner peripheral end 12 formed by the inclined surfaces 21 and 22 of the brim-shaped member 18 of the intermediate member 8. The protrusions 13 and 14 are the inner surface 2
3, 24 and the intermediate member 8 having long side portions 17 facing the balls 4 and covered by the protrusions 25, 26 of the members 6, 7.
The adhesive surfaces of the members 6 and 7 of FIG.

In addition to the sealing action, the member 6 joins the seal 5 to the mechanical component (the outer ring 2 of the bearing 1 in the figure) and the member 7 to form a V-shaped lip which faces the inside and outside of the seal 5, 27. A concave portion is formed on the outside with respect to 28 and is arranged in the axial direction. That is, the members 6 and 7 are inclined surfaces 33 and 3 respectively.
The base portions 31 and 32 having the number 4 are formed to contact the inclined surfaces 21 and 22 of the brim-shaped member 18.

In use, the end portion 35 of the member 6 and the base portion 31 housed in the annular sheet 36 come into contact with the outer ring 2 to cooperate with each other to seal the seal 5 and the end portion 37 and the base portion 32 of the member 7 are While sliding on the surface 38 of the inner ring 3 parallel to the axis of symmetry (not shown) of the bearing 1, they cooperate to seal and protect the ball 4.

[0008]

In accordance with the construction of the present invention, the use of two synthetic resins having similar chemistries, and the use of a softer component than the other containing plastics, results in an intermediate annular insert. Is molded together with the peripheral members, so that it is lightweight, inexpensive, the degree of thermal expansion is acceptable, and the degree of deformation is always within the allowable range of elasticity,
You can get a seal that never interferes with driving. Further, in particular, by making the peripheral portion V-shaped, it is possible to obtain optimum seal contact by the outer peripheral portion accommodated in the inner annular sheet of the outer ring, and to cause thermal expansion due to the heat generated in the bearing. The effect peculiar to the present invention is that most of the deformation can be absorbed.

[Brief description of drawings]

1 is a partial cross-sectional view of a seal according to the present invention.

[Explanation of symbols]

 1 Partial cross-sectional view of bearing 2 Outer ring 3 Inner ring 4 Ball 5 Seal 6 Outer elastic seal member 7 Outer elastic seal member 8 Intermediate member 11 First outer peripheral end 12 Second inner peripheral end 18 Lag-shaped member 21 Inclined surface 22 Inclination Surface 23 Inner surface of protrusion 24 Inner surface of protrusion 25 Projection 26 Projection

Claims (7)

[Claims] 1. A seal for a rolling bearing comprising a peripheral portion of a relatively soft, elastic synthetic plastic material and a relatively rigid intermediate portion, said intermediate portion being a single tough ring formed from a synthetic plastic polymer. A peripheral portion of the relatively soft elastic synthetic resin material is molded at the same time as the annular insert, and the peripheral portion is fixed to an outer end of a first peripheral portion and an inner end of a second peripheral portion of the annular insert, respectively. , The peripheral part is an elastomer,
A seal formed from a mixture of the same material that forms the annular insert and a synthetic resin polymer. 2. The seal according to claim 1, wherein the annular insert is formed from one of the group of polypropylene, polyamide, polyethylene. 3. The seal of claim 2, wherein the peripheral portion is a separate component and the peripheral portion is EPD.
M-based trefsin (TREFSIN, registered trademark) or santoprene (SANTOPRENE, registered trademark), nitrile rubber (NBR) -based geolast (GEOLAST, registered trademark), KELPROX (registered trademark) EPDM as a base A seal containing an elastomer selected from the group including VESTOPREN® and TELLCAR®, and the FKM-based materials manufactured by 3M, which are not yet trade names. 4. The seal according to claim 3, wherein the annular insert has a radial cross section, and the radial cross sections have protrusions at opposite ends of the long sides, respectively. The seals are fixed to the inclined surfaces, and the protrusions are covered by the protrusions of the peripheral portion. 5. The seal according to claim 1, wherein each of the peripheral portions has a V-shaped lip, the lips corresponding to a first lip corresponding to the outer peripheral portion and the inner peripheral portion. A second lip that is axially disposed with respect to the two opposing surfaces of the intermediate member, the surfaces being respectively a first inner surface and a second inner surface, the lip being on an outer surface of the bearing. Seals that face each other and are formed as recesses. 6. The seal according to claim 5, wherein the first lip is an end portion that comes into contact with and cooperates with an annular seat formed on the outer ring of the bearing. 7. The seal according to claim 5, wherein the outer end of the second lip slides and cooperates with the surface of the inner ring of the bearing, respectively.