JPH0596549U - Sealing ring for bearing - Google Patents

Abstract

(57) [Summary] [Object] To provide a sealing ring for a bearing, which can be easily and surely assembled and which can maintain a sufficient sealing effect for a long period of time. [Structure] In the sealing ring, the main body (1) is made of synthetic resin having heat resistance and oil erosion resistance, and the central portion (1b) along the circumference includes a reinforced resin plate (2) or other portions. It is made thicker and the circumferential edge portion (1c) is configured to have greater flexibility than the outer circumferential edge portion (1a).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a bearing sealing ring that seals an annular space defined between an inner ring and an outer ring of a bearing.

[0002]

[Prior Art]

 Bearings, especially small rolling bearings, are often used in various small precision equipment and office equipment. In this case, it is necessary to prevent lubricant from leaking from the bearings to the outside. For this reason, conventionally, a method has been used in which the annular space defined between the inner ring and the outer ring of the bearing is sealed with a sealing ring made of rubber or synthetic resin.

[0003]

[Problems to be solved by the device]

 By the way, it is said that the outer edge of this kind of sealing ring must be surely engaged with the inner peripheral wall of the outer ring of the bearing and the inner edge thereof with the outer peripheral wall of the inner ring of the bearing over the entire circumference. However, it must be easy to assemble, have excellent heat resistance and oil erosion resistance, and be able to flexibly deal with bearing dimensional errors, that is, dimensional errors between the inner and outer rings. The conventional sealed ring has a problem that it cannot fully meet the above-mentioned requirements.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to reliably absorb the dimensional error of the bearing and to install the bearing. It is easy and can maintain a sufficient sealing effect for a long period of time. It seeks to provide this type of sealed ring.

[0005]

[Means for Solving the Problems]

 To achieve the above object, the bearing seal ring according to the present invention is configured such that the central portion along the circumference has greater rigidity than the inner and outer peripheral edge portions, and the inner peripheral edge portion has a greater rigidity than the outer peripheral edge portion. Is also configured to have great flexibility.

The entire sealing ring is made of a synthetic resin having excellent heat resistance and oil erosion resistance, and the central portion along the circumference includes a reinforced resin plate or is made thicker than other portions, The peripheral portion is formed to have a wavy cross-sectional shape.

[0007]

[Action]

 The sealing ring is fixed by being press-fitted into the annular space between the inner and outer rings of the bearing. In this case, the dimensional error of the width of the annular space is absorbed by the inner peripheral edge portion of the corrugation, and the outer peripheral edge is attached to the inner wall of the outer ring of the bearing and the inner peripheral edge is attached to the outer wall of the inner ring of the bearing by appropriate rigidity of the central portion. The annular space is sealed together.

[0008]

【Example】

 1 to 3 show a first embodiment. In the figure, 1 is a sealing ring body made of a heat-resistant and oil-erosion resistant synthetic resin having an outer peripheral edge portion 1a, a central portion 1b along the circumference, and an outer peripheral edge portion 1c, and 2 is an outer peripheral edge portion 1a. The reinforced resin plate integrally molded so as to be covered with the central portion 1b and 3 is the outer ring of the bearing, and 4 is the inner ring of the bearing. The inner peripheral edge portion 1c includes a thin portion and is formed to have greater flexibility than the outer peripheral edge portion 1a. The inner peripheral wall of the outer ring 3 is formed with an annular groove 3a into which the outer peripheral edge of the sealing ring is fitted, and the outer peripheral wall of the inner ring 4 is formed with an annular groove 4a into which the inner peripheral edge of the sealing ring is fitted.

Since the sealing ring of the present invention is configured as described above, if the sealing ring is press-fitted into the annular space defined by the outer ring 3 and the inner ring 4 of the bearing from above, the inner peripheral edge thereof The portion 1c is appropriately bent outward, and the outer peripheral edge is fitted into the annular groove 3a and the inner peripheral edge is fitted into the annular groove 4a to seal the annular space. Although not shown, the lower annular space defined by the inner and outer rings 3, 4 of the bearing is also sealed from below by a sealing ring which is similarly press-fitted. Therefore, the lubricating oil inside the bearing will not leak out. In this case, since the inner peripheral edge portion 1c of the sealing ring has a soft flexibility, the distance between the inner peripheral surface of the outer ring 3 and the outer peripheral surface of the inner ring 4 is the entire circumference due to processing errors of related parts. Even if they are not the same, the inner peripheral edge portion 1c expands and contracts correspondingly, and the inner peripheral edge is securely fitted into the groove 4a over the entire circumference. Further, since the reinforced resin plate 2 having high rigidity is embedded in the central portion 1b of the seal ring, the seal ring may be disengaged from the bearing due to the vibration generated during the operation of the bearing or the distortion of the inner and outer rings. However, the central part of the bearing does not bulge outward and can be stably held in the bearing at all times.

4 to 6 show a second embodiment. In this embodiment, substantially the entire sealing ring is made of a synthetic resin having heat resistance and oil erosion resistance, and the central portion 1b along the circumference is made thicker than other portions so as to have rigidity. The present embodiment differs from the first embodiment in that the inner peripheral edge portion 1c is formed in a corrugated sectional shape. However, since the function and effect are the same as those in the first embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

7 to 9 show a third embodiment. In this embodiment, a plurality of radially extending ridges 1b 'are arranged at equal intervals as shown in FIG. 9 in order to give rigidity to the central portion 1b along the circumference of the sealing ring. Although different from the second embodiment in this point, the operation and effect are the same as in the case of the second embodiment, so similar parts are designated by the same reference numerals and description thereof is omitted.

10 to 12 show a fourth embodiment. This embodiment differs from the second embodiment in that the inner peripheral edge portion 1c of the sealing ring is formed so as to taperly extend straightly toward the annular groove 4a formed in the inner ring 4 of the bearing. However, since the operation and effect are the same as in the case of the second embodiment, similar parts are designated by the same reference numerals and the description thereof is omitted.

13 to 15 show a fifth embodiment. This embodiment is different from the fourth embodiment in that the inner peripheral edge portion 1c of the sealing ring is formed in a thickened shape and the outer peripheral edge is slightly curved downward, but the operation and effect are the same. Therefore, similar parts are designated by the same reference numerals and the description thereof is omitted.

16 to 18 show a sixth embodiment. This embodiment is different from the fifth embodiment in that the inner peripheral edge portion 1c of the sealing ring extends horizontally with a uniform thickness, but since the operation and effect are the same, the same parts are designated by the same reference numerals. Is attached and its description is omitted.

[0015]

[Effect of the device]

 As described above, according to the present invention, even if there is some variation in the width between the inner and outer races of the bearing, the bearing can be easily and reliably assembled, and after assembly, a sufficient sealing effect can be exerted for a long period of time. Since a sealed ring having excellent heat resistance and oil erosion resistance, which is particularly suitable for a very small bearing, can be manufactured by an injection molding method, it can be provided in large quantities and at low cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a first embodiment of a bearing sealing ring according to the present invention.

FIG. 2 is a plan view of the sealing ring shown in FIG.

3 is a bottom view of the sealing ring shown in FIG. 1. FIG.

FIG. 4 is a partially cutaway side view of a second embodiment of the bearing sealing ring according to the present invention.

FIG. 5 is a plan view of the sealing ring shown in FIG.

FIG. 6 is a bottom view of the sealing ring shown in FIG.

FIG. 7 is a left half sectional view of a third embodiment of the bearing seal ring according to the present invention.

FIG. 8 is a plan view of the sealing ring shown in FIG.

9 is a bottom view of the sealing ring shown in FIG. 7. FIG.

FIG. 10 is a sectional view of a left half of a fourth embodiment of the bearing sealing ring according to the present invention.

11 is a plan view of the sealing ring shown in FIG.

12 is a bottom view of the sealing ring shown in FIG.

FIG. 13 is a left half sectional view of a fifth embodiment of the bearing seal ring according to the present invention.

FIG. 14 is a plan view of the sealing ring shown in FIG.

FIG. 15 is a bottom view of the sealing ring shown in FIG.

FIG. 16 is a sectional view of the left half of a sixth embodiment of the bearing sealing ring according to the present invention.

FIG. 17 is a plan view of the sealing ring shown in FIG.

FIG. 18 is a bottom view of the sealing ring shown in FIG. 16.

[Explanation of symbols]

 1 Sealing Ring Main Body 1a Outer Edge Part 1b Central Part 1c Inner Edge Part 2 Reinforced Resin Plate 3 Outer Ring of Bearing 4 Inner Ring of Bearing 3a, 4a Annular Groove

Claims (4)

[Scope of utility model registration request] 1. A bearing seal ring for sealing an annular space defined between an inner ring and an outer ring of a bearing, wherein a central portion along a circumference has a rigidity greater than those of inner and outer peripheral portions. A sealing ring, wherein the inner peripheral edge portion is configured to have greater flexibility than the outer peripheral edge portion. 2. The synthetic resin sealing ring according to claim 1, wherein a reinforced resin plate is integrally molded in a central portion along the circumference. 3. The synthetic resin seal ring according to claim 1, wherein a central portion along the circumference is formed thicker than the inner and outer peripheral edge portions. 4. The synthetic resin seal ring according to claim 1, wherein the inner peripheral edge portion is formed to have a corrugated cross-sectional shape.