JP2640320B2 - Hermetic seal for rolling bearings - 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]

The present invention relates to a hermetic seal for a rolling bearing.

[0002]

2. Description of the Related Art Between the outer ring and the inner ring of a rolling bearing, an outer periphery and an inner periphery of a strong support plate made of an annular thin plate are wrapped with a soft seal portion, and one surface of the support plate is made of a material of the same quality as the seal portion. A sealing seal made of metal and rubber in which the outer peripheral portion and the inner peripheral portion are connected to each other by being covered with a covering layer, and the outer peripheral sealing portion is fitted into the inner peripheral annular sealing groove of the outer ring, and attached. It is known to contact the outer periphery of the inner race with the outer ring of the inner race, thereby protecting the rolling elements rolling between the outer race and the inner race of the bearing with a hermetic seal.

[0003]

If the support plate is made of metal, the weight increases, and the manufacturing cost increases because the inner and outer peripheries and one side are wrapped with integral rubber. Further, the thermal expansion caused by the heat generated during operation is such that the metal is large and the rubber is small, so that during operation, the metal support plate has a larger thermal expansion than the rubber that wraps the outer and inner circumferences and one side integrally. Inflation swells toward the other side that is not covered by the rubber coating layer, causing the outer peripheral seal to be damaged in the seal groove of the outer ring or causing the support plate to undergo permanent deformation, causing cooling to stop. At times, the hermetic seal may come off from the seal groove or an effective hermetic action may not be performed due to permanent deformation of the support plate. This is the same even if the support plate is formed of a thin plate of a synthetic resin.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed to obtain a hermetic seal for a rolling bearing which is inexpensive, easy to manufacture, lightweight, and does not suffer from thermal expansion even at high temperatures. The hermetic seal of the rolling bearing according to the present invention comprises a relatively soft and elastic annular outer peripheral seal member (6), an inner peripheral seal member (7), and a relatively hard and strong annular intermediate member (8). (I) the intermediate member (8) is formed of a synthetic plastic polymer and has an outer periphery and an inner periphery; (ii) the outer peripheral seal member (6) and the inner peripheral seal member (7) are independent. The outer peripheral sealing member (6) is integrally fixed to the outer periphery of the intermediate member (8) without an adhesive, and the inner peripheral sealing member (7) is formed of the intermediate member (8). Adhered to the circumference without adhesive A peripheral sealing member (6) by an intermediate member (8),
A sealing seal for a rolling bearing coupled with an inner peripheral sealing member (7), wherein the outer peripheral sealing member (6) and the inner peripheral sealing member (7) form an elastomer and the intermediate member (8). Formed from a mixture with the same synthetic plastic polymer as described above, so that the adhesive-free integral fastening between the outer peripheral sealing member (6) and the inner peripheral sealing member (7) and the intermediate member (8) Is obtained by insert-molding an intermediate member (8) between an outer peripheral seal member (6) and an inner peripheral seal member (7) which are separately formed, and the intermediate member (8) is The cross-sectional shape in the radial direction is a trapezoid whose outer side and inner side have inclined surfaces (21, 22), and the long side (17) faces the inside of the bearing. , The inner circumference (16) of the annular projecting in the axial direction toward the inside of the bearing Protrusions (13, 14) are provided,
The outer peripheral sealing member (6) is an inclined surface (21) on the outer periphery of the trapezoid.
And an outer peripheral surface of a projection (13) projecting in the axial direction from an outer peripheral portion (15) of the long side (17), and an end surface of the projection (13) projecting from the outer peripheral portion (15). 23) has a radially inwardly extending annular projection (25) fixedly attached over the inner peripheral sealing member (7). The inner peripheral sealing member (7) has an inclined inner peripheral surface (22) of the trapezoid and a long side (17). Is fixed to the inner peripheral surface of the projection (14) projecting in the axial direction from the inner peripheral portion (16), and covers the end surface (24) of the projection (14) projecting from the inner peripheral portion (16). Radially outwardly projecting annular protrusions (26)
It is characterized by having.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The outer peripheral seal member (6) and the inner peripheral seal member (7) have an annular annular recess opened in a V shape toward the outside of the bearing. An outer peripheral lip (35) is provided on the outer periphery, which is separated from the main body (31) by the depression, and the inner peripheral seal member (7) is provided with an inner peripheral lip (3) separated from the main body (32) by the depression.
7) is provided on the inner periphery, and the annular outer peripheral lip (35) of the outer peripheral seal member (6) is attached to the annular seal groove (36) on the inner peripheral surface of the outer ring to attach the hermetic seal to the outer ring (2) of the bearing. Fitting
An outer peripheral lip (31) of the outer peripheral seal member (6) seals with the outer race, and an annular seal groove (36) on the inner periphery of the outer race for attaching the hermetic seal to the outer race (2) of the bearing. To seal the outer ring.

[0006]

In the drawings, reference numeral 1 denotes a rolling bearing, 2 denotes an outer ring thereof, 3 denotes an inner ring, 4 denotes a plurality of balls arranged between the outer ring and the inner ring (only one of them is shown in the figure), Numeral 5 indicates at least one annular hermetic seal between the outer ring and the inner ring for protecting the ball 4. Although not limited to the illustrated one, the hermetic seal 5 is an annular, relatively soft and elastic outer peripheral seal member 6 and an inner peripheral seal member 7, and a relatively hard, strong annular intermediate member connecting the two seal members 6, 7. And a member 8.

According to the present invention, the intermediate member 8 is formed of a synthetic plastic polymer,
And the inner peripheral seal member 7.

The outer peripheral seal member 6 and the inner peripheral seal member 7 are independent members. The outer peripheral seal member 6 is located on the outer periphery 11 of the intermediate member 8, and the inner peripheral seal member 7 is located on the inner periphery 12 of the intermediate member 8. Are fixed respectively. The outer peripheral sealing member 6 and the inner peripheral sealing member 7 are molded from a mixture of the elastomer and the same material as the synthetic plastic polymer forming the intermediate member 8.

The intermediate member 8 is preferably molded from one of the group of synthetic plastics including polypropylene, polyamide and polyethylene. The outer peripheral seal member 6 and the inner peripheral seal member 7 are made of EPDM in addition to the same synthetic plastic as that for forming the intermediate member.
(TREFSIN (registered trademark)), Santoprene (SANTOPRENE (registered trademark)), and NBR-based geolast (GEOLAS).
T, registered trademark), Kelprox (KELPROX,
(Registered trademark), Vestprene based on EPDM (V
ESTOPEN (registered trademark), Telcar (TELC)
It is preferably molded from one of the group of FKM-based materials from AR, as well as the 3M company, which does not yet have a trade name. The above EPDM, NBR, FK
M is an abbreviation for rubber material established by the American Society for Testing and Materials (ASTM).

The intermediate member 8 has a trapezoidal shape whose radial cross section has inclined surfaces 21 and 22 on the outer periphery and the inner periphery, and has a long side 17 facing the inside of the bearing. The outer peripheral portion 15 and the inner peripheral portion 16 are provided with annular projections 13 and 14 projecting in the axial direction toward the inside of the bearing as shown in the figure. Therefore, the outer periphery 11 of the intermediate member is composed of the conical surface formed by the trapezoidal inclined surface 21 and the cylindrical surface of the outer periphery of the projection 13 from the outer peripheral portion.
2 and a cylindrical surface on the inner periphery of the projection 14 from the inner periphery.

For this reason, the outer peripheral sealing member 6 is fixed to the conical surface formed by the inclined surface 21 on the outer periphery of the intermediate member and the cylindrical surface on the outer periphery of the projection 13.
3 has a radially inward annular projection 25 which is also fixed to the end face 23. Thereby, the fixing area between the outer peripheral sealing member 6 and the intermediate member 8 increases, and strong fixing is performed.

Similarly, the inner peripheral sealing member 7 is fixed to the conical surface formed by the inclined surface 22 on the inner periphery of the intermediate member and the cylindrical surface on the inner periphery of the projection 14, and has a radius covering the end face 24 of the projection 14. Since the projection 26 has an annular projection 26 facing outward in the direction, and the projection 26 is also fixed to the end face 24, the fixing area between the inner peripheral sealing member 7 and the intermediate member 8 is increased, and strong fixing is achieved. Done.

The hermetic seal 5 has an inner surface 2 facing the inside of the bearing.
8 and an outer surface 27 facing out of the bearing. And
The outer peripheral seal member 6 and the inner peripheral seal member 7 each have an annular recess opened in a V shape toward the outer surface, and the outer peripheral seal member has an annular outer peripheral lip 35 separated from the main body 31 by the recess on the outer periphery. The inner peripheral sealing member is also provided with an annular inner peripheral lip 37 separated from the body 32 by the recess.
It has.

For use, the annular outer peripheral lip 3 of the outer peripheral seal member 6 is fitted into the annular seal groove 36 provided on the inner periphery of the outer ring 2.
5, the hermetic seal 5 is attached to the outer race, and the seal is formed between the outer race and the inner race 3. The annular inner peripheral lip 37 of the inner peripheral seal member 7 is brought into contact with the outer periphery of the inner race 3 to seal with the inner race. To protect the ball 4.

[0015]

As is clear from the above, the hermetic seal of the present invention has the following effects. (I) The annular outer peripheral sealing member 6 having a relatively soft elastic body and the inner peripheral sealing member 7 are separate bodies, and the outer peripheral sealing member is fixed to the outer periphery of the intermediate member 8 formed of a synthetic plastic polymer. The peripheral seal member is fixed to the inner periphery of the intermediate member. Therefore, the intermediate member is insert-molded between the outer peripheral seal member and the inner peripheral seal member that are separately molded,
The product can be easily manufactured and the product is lightweight. (Ii) Since the outer peripheral seal member 6 and the inner peripheral seal member 7 are molded from a mixture of the elastomer and the same synthetic plastic polymer that forms the intermediate member 8, the outer peripheral seal member and the inner peripheral seal member are formed. The member is strongly fixed to the intermediate member, and the difference in thermal expansion is small. The outer peripheral seal member and the inner peripheral seal member are separately and independently fixed to the outer periphery of the intermediate member and the inner periphery of the intermediate member, respectively, so that there is no adverse effect due to the difference in thermal expansion. (Iii) In addition, the intermediate member 8 has a radial cross-sectional shape having inclined surfaces 21 and 22 on an outer periphery and an inner periphery, and a long side 17.
Is a trapezoid facing the inside of the bearing, and its outer peripheral portion 15
And annular projections 13 and 14 projecting in the axial direction toward the inside of the bearing on the inner peripheral portion 16, and the outer peripheral sealing member 6 is provided.
Are the inclined surface 21 on the outer periphery of the trapezoid and the outer peripheral portion 1 on the long side 17.
5 has a radially inward annular projection 25 fixed to the outer peripheral surface of the projection 13 projecting in the axial direction from the outer periphery 5 and fixedly covering the end surface 23 of the projection 13 projecting from the outer peripheral portion 15. The inner peripheral sealing member 7 is fixed to the inclined surface 22 of the inner periphery of the trapezoid and the inner peripheral surface of the projection 14 projecting in the axial direction from the inner peripheral portion 16 of the long side 17. The radially outwardly extending annular projection 26 is fixed to cover the end surface 24 of the projection 14 projecting from the portion 16, so that the fixing area between the outer peripheral sealing member and the intermediate member and between the inner peripheral sealing member and the intermediate member are increased. I do. Therefore, even if the outer peripheral seal member and the inner peripheral seal member are separate, they do not separate from the intermediate member.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a part of a bearing equipped with a hermetic seal according to the present invention.

[Explanation of symbols]

Reference Signs List 1 bearing 2 outer ring of bearing 3 inner ring of bearing 4 ball 5 hermetic seal 6 outer peripheral seal member of hermetic seal 7 inner peripheral seal member of hermetic seal 8 intermediate member 11 outer peripheral of intermediate member 12 inner peripheral of intermediate member 13 outer peripheral portion of long side 14 Projection of inner peripheral portion of long side 18 Trapezoidal portion of intermediate member 17 Long side of trapezoidal portion 21 Inclined surface of trapezoidal outer periphery 22 Inclined surface of trapezoidal portion inner periphery 23 End face of projection 13 24 End face of projection 14 25 Projection of outer peripheral seal member fixed to end surface 23 Projection of inner peripheral seal member fixed to end surface 24 of projection

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-161119 (JP, A) JP-A-55-65725 (JP, A)

Claims (7)

(57) [Claims] 1. An outer peripheral sealing member (6) and an inner peripheral sealing member (7), which are relatively soft and elastic, and an annular intermediate member (8), which is relatively hard and strong, are provided. The intermediate member (8) is formed of a synthetic plastic polymer and has an outer periphery and an inner periphery. (Ii) The outer peripheral sealing member (6) and the inner peripheral sealing member (7) are formed as separate and independent members. The outer peripheral seal member (6) is integrally fixed to the outer periphery of the intermediate member (8) without an adhesive, and the inner peripheral seal member (7) has no adhesive to the inner periphery of the intermediate member (8). And an outer peripheral sealing member (6) by an intermediate member (8);
A hermetic seal for a rolling bearing coupled with an inner peripheral seal member (7), wherein the outer peripheral seal member (6) and the inner peripheral seal member (7)
Are formed from a mixture of an elastomer and the same synthetic plastic polymer that forms said intermediate member (8), whereby the outer peripheral sealing member (6), and the inner peripheral sealing member (7) and the intermediate member (8) are formed. ), The intermediate member (8) is provided between the outer peripheral sealing member (6) and the inner peripheral sealing member (7) which are separately formed.
The intermediate member (8) has a cross section in the radial direction having an outer peripheral surface and inclined surfaces (21, 22) on the inner peripheral surface, and a long side (17) having a long side (17). It has a trapezoidal shape facing the inside of the bearing, and has an outer peripheral portion (15) on its long side and annular projections (13, 14) projecting in the axial direction toward the inside of the bearing on the inner peripheral portion (16). Outer circumference seal member (6)
Are fixed to the inclined surface (21) of the outer periphery of the trapezoid and the outer peripheral surface of the projection (13) projecting in the axial direction from the outer periphery (15) of the long side (17). ) Has a radially inwardly extending annular projection (25) secured over the end surface (23) of the projection (13) projecting therefrom, and the inner peripheral sealing member (7) has a slope of the inner periphery of the trapezoid. Face (22) and long side (17)
Is fixed to the inner peripheral surface of the projection (14) projecting in the axial direction from the inner peripheral portion (16), and covers the end surface (24) of the projection (14) projecting from the inner peripheral portion (16). A hermetic seal for a rolling bearing, characterized by having a radially outwardly projecting annular projection (26) fixedly secured thereto. 2. The hermetic seal of a rolling bearing according to claim 1, wherein the intermediate member (8) insert-molded between the outer peripheral seal member (6) and the inner peripheral seal member (7) is polypropylene or polyamide. A hermetic seal of a rolling bearing formed from any one of the group of polyethylene. 3. The hermetic seal for a rolling bearing according to claim 2, wherein the outer peripheral seal member (6) and the inner peripheral seal member (7) are made of an EPDM-based material, an NBR-based material, or an FKM-based material. A hermetic seal for a rolling bearing comprising an elastomer selected from any one of the groups. 4. The hermetic seal of a rolling bearing according to claim 1, wherein the outer peripheral sealing member (6) and the inner peripheral sealing member (7) are formed in an annular shape in an axial direction that opens in a V shape toward the outside of the bearing. The outer peripheral sealing member has a concave outer peripheral lip (35) separated from the main body (31) by the concave, and the inner peripheral sealing member (7) is separated from the main body (32) by the concave. Hermetic seal for rolling bearings with an annular inner lip (37) on the inner circumference. 5. The hermetic seal of a rolling bearing according to claim 4, wherein the annular outer peripheral lip (35) of the outer peripheral seal member (6) attaches the hermetic seal to the outer ring (2) of the bearing. A hermetic seal for rolling bearings that fits in the peripheral annular seal groove (36) and seals with the outer ring. 6. The hermetic seal of a rolling bearing according to claim 4, wherein the annular inner peripheral lip (37) of the inner peripheral sealing member (7) comes into contact with the outer periphery of the inner ring (3) of the bearing to contact the inner ring. Hermetic seal for rolling bearings, which is designed to seal between. 7. The hermetic seal for a rolling bearing according to claim 3, wherein the outer peripheral seal member (6) and the inner peripheral seal member (7) are TREFSIN (registered trademark), SANTOPRENE (registered trademark). ), GEOLAST (registered trademark), KELPROX (registered trademark), VESTPREN (registered trademark), Telker (TE)
A hermetic seal for a rolling bearing comprising an elastomer selected from any one of the groups of LCAR®.