JP2008151164A - Seal for bearing, bearing and forming die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal for bearing capable of improving dust-proof and water-proof properties by seal better than former seals irrespective of finish of working of a seal groove and the like of a bearing side, a bearing using the seal, and a forming die for forming the seal. <P>SOLUTION: The seal 10 for bearing is arranged between an outer ring and an inner ring of the bearing and is provided with a projection projecting from a circumferential seal end part in a concentric circle shape. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seal used for a bearing used in various rotating machine devices, a bearing including the seal, and a molding die for molding the seal.

  The following Patent Document 1 includes a shield plate made of a relatively soft synthetic resin in the outer ring or an engagement portion between the outer ring and the inner ring, and the other portion is made of a relatively hard synthetic resin. A bearing sealing device is disclosed that can be reliably engaged with an elastically deforming engaging portion even if there is any other portion, and that other portions have an appropriate rigidity so that they are not deformed or curved (see summary).

FIG. 7 shows an example in which a conventional bearing seal is arranged on the bearing. As shown in FIG. 7, the seal 50 is rigid due to the cored bar 50b, the fitting portion 50a is fitted in the seal groove 51a on the inner surface side of the outer ring 51, and the end portion 50c on the opposite side of the fitting portion 50a. Is attached in contact with the inner surface 52 a of the inner ring 52.
Japanese Utility Model Publication No. 06-6752

  The conventional type of bearing seal of FIG. 7 and the shield plate of Patent Document 1 have the following problems. That is, even if the outer diameter dimension of the conventional bearing seal 60 having the fitting portion 60a and the cored bar 60b as shown in FIG. 8 is as specified, the processing result of the seal groove 61a of the outer ring 61 and the influence of deformation due to heat treatment are affected. When the dimensions such as the inner diameter of the seal groove 61a of the outer ring 61 are reduced, the fitting portion 60a of the seal 61 does not fully enter the seal groove 61a of the outer ring 61 as shown in FIG. The diameter portion 60c is deformed.

  In addition, as shown in FIG. 10, when the dimension such as the inner diameter of the seal groove 61a of the outer ring 61 becomes large, the interference of the fitting portion 60a of the seal 60 becomes insufficient, and unfitting occurs. As a result, the dustproofness and waterproofness are reduced as the sealing performance is lowered, and the problem of causing grease leakage is likely to occur. Further, when the seal groove 61a becomes large and the groove portion becomes deep, the frequency of occurrence of the above problems increases. The same problem occurs when the outer diameter of the seal 60 varies.

  In view of the above-described problems of the prior art, the present invention provides a bearing seal that can improve the dust resistance and waterproofness of the seal over the conventional product regardless of the finished processing of the seal groove on the bearing side. An object of the present invention is to provide a bearing used and a molding die for molding the seal.

  In order to achieve the above object, a bearing seal according to the present invention is a bearing seal disposed between an outer ring and an inner ring of a bearing, and has a protrusion protruding concentrically from a circumferential seal end. It is characterized by providing.

  According to this bearing seal, since the bearing seal can be securely fitted into the seal groove on the bearing side by the projection protruding concentrically from the end of the circumferential seal, it is possible to process the seal groove on the bearing side. Regardless of the workmanship, the dust-proof and waterproof properties of the seal can be improved compared to the conventional product, and the leakage prevention of lubricant such as grease filled in the bearing can be improved compared to the conventional product.

  In the bearing seal, the thickness of the protrusion is preferably thinner than the thickness of the seal end.

  Moreover, it is preferable that the said seal end part has a fitting part fitted to the seal groove | channel provided in the said outer ring | wheel or the said inner ring | wheel, and the said protrusion protrudes in the circumferential form from the vicinity of the said fitting part.

  Moreover, it is preferable to set the size of the fitting portion small with respect to the seal groove, the fitting portion can be reliably fitted into the seal groove, and the space between the small fitting portion and the seal groove is loose. Even if it becomes, it can be reliably fitted and sealed by the protrusion.

  Moreover, it is preferable that the said protrusion is formed by the chamfering part formed in the metal mold | die mating surface of the molding die of the said bearing seal. Thereby, the bearing seal provided with the protrusions can be easily manufactured by molding.

  A bearing according to the present invention includes an outer ring, an inner ring, and a seal disposed between the outer ring and the inner ring, and the seal includes a protrusion protruding concentrically from a circumferential seal end. It is characterized by.

  According to this bearing, since the seal can be securely fitted into the seal groove on the bearing side by the protrusion projecting concentrically from the circumferential end of the seal, regardless of the processing performance of the seal groove or the like of the bearing. The dustproof and waterproof properties by the seal can be improved compared to the conventional product, and the leakage prevention of lubricant such as grease filled in the bearing can be improved compared to the conventional product.

  In the bearing, it is preferable that the seal end portion has a fitting portion that fits into a seal groove provided in the outer ring or the inner ring.

  Moreover, it is preferable to set the size of the fitting portion small with respect to the seal groove, the fitting portion can be reliably fitted into the seal groove, and the space between the small fitting portion and the seal groove is loose. Even if it becomes, it can be reliably fitted and sealed by the protrusion.

  When the fitting portion is small relative to the seal groove due to the above setting, seal and / or seal groove dimensional error, etc., the projection comes into contact with at least a part of the seal groove, thereby securely fitting. Can be sealed.

  In addition, when the fitting portion is larger than the seal groove due to a dimensional error of the seal and / or the seal groove, the protrusion protrudes from the seal groove so that the protrusion does not interfere with the fitting. Can be fitted. Moreover, it is preferable that the said protrusion is formed by the chamfering part formed in the metal mold | die matching surface of the molding die of the said seal | sticker. Thereby, the bearing seal provided with the protrusions can be easily manufactured by molding.

  Note that a lip portion that contacts a part of the inner ring or the outer ring can be provided at the seal end opposite to the fitting portion. Thereby, although the said bearing seal can be comprised in a contact seal, it is good also as a non-contact seal in which the seal edge part on the opposite side of a fitting part does not contact a part of an inner ring | wheel or an outer ring | wheel.

  A molding die according to the present invention is a molding die for molding the above-described bearing seal, and is characterized in that a chamfering process is performed on a die mating surface corresponding to the projection.

  According to this molding die, it is possible to easily obtain a molding die for a bearing seal having the above-described protrusions by chamfering the die mating surfaces, and the above-described protrusions can be used as bearing seals. Even if added, the processing cost of the molding die is not so much. In addition, when the above-mentioned bearing seal has a cored bar, insert molding in which molding is performed after the cored bar is loaded into the mold cavity is preferable.

  According to the bearing seal and the bearing of the present invention, it is possible to improve the dustproofness, waterproofness, and prevention of lubricant leakage by the seal over the conventional product regardless of the processing result of the seal groove on the bearing side.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a bearing seal according to the present embodiment. FIG. 2 is a cross-sectional view of the main part of the bearing showing a state in which the bearing seal of FIG. 1 is fitted in the seal groove of the outer ring. FIG. 3 is a cross-sectional view of the main part of the bearing showing another state in which the bearing seal of FIG. 1 is fitted in the seal groove of the outer ring.

  A bearing seal 10 shown in FIG. 1 includes a cored bar 14 made of a rigid metal plate such as steel to maintain its shape, and a peripheral part 15 formed of an elastic material such as a rubber material around the cored bar 14; And is configured in a substantially disc shape having a center hole c as a center and a center axis p indicated by a one-dot chain line.

  As shown in FIG. 1, the metal core 14 is bent to have a substantially L-shaped cross section, and the peripheral portion 15 has a seal groove 22 (FIGS. 2 and 3) formed on the inner surface 21a of the outer ring 21 of the bearing. And the fitting portion 11 provided at the outer peripheral end of the seal on the short side 14a side of the cross section of the cored bar 14 and the outer surface 23a of the inner ring 23 of the bearing on the opposite side of the fitting portion 11 And a lip portion 13 provided at the inner peripheral end of the seal. The fitting portion 11 is provided so as to bulge outwardly from the short side 14a of the cored bar 14 of FIG. 1, and constitutes a seal outer peripheral end portion.

  The peripheral portion 15 has a flat portion 15a formed flat between the inner peripheral end portion of the seal and the outer peripheral end portion of the seal corresponding to the long cross section 14b of the core metal 14, and further on the outer peripheral side of the flat portion 15a. An inclined surface 16 is formed. The inclined surface 16 is inclined toward the lower end 16a, and is connected to the upper portion 11a of the fitting portion 11 in the vicinity of the lower end 16a.

  The protrusion 12 extends concentrically around the central axis p from the boundary between the lower end 16a of the inclined surface 16 inclined from the outer peripheral side of the flat portion 15a in FIG. 1 and the upper portion 11a of the fitting portion 11 at the outer peripheral end of the seal. As shown in FIG.

  The projection 12 is thinner than the thickness of the fitting portion 11 (vertical direction in FIG. 1) and is configured in a knife edge shape, and the flat portion 12a extending in the horizontal direction in FIG. 1 from the lower end 16a of the inclined surface 16; And an inclined portion 12b that is inclined from the upper portion 11a of the fitting portion 11 toward the tip, and is made of an elastic material such as a rubber material and is made thin, so that it has flexibility and is easily elastically deformed. ing.

  The operation and effect when the bearing seal 10 of FIG. 1 is incorporated in a bearing will be described. The fitting portion 11 of the bearing seal 10 is inserted and fitted into the seal groove 22 of the outer ring 21 of the bearing, and the lip portion 13 is brought into contact with the outer surface 23a of the inner ring 23 to thereby bring the bearing seal 10 into the bearing 1 (FIGS. 2 and 3). The fitting portion 11 is elastically deformed and fitted into the seal groove 22 (see FIG. 7) to seal the inside of the bearing and prevent the leakage of lubricant such as grease filled in the bearing. Waterproof and dustproof properties can be obtained.

  When the bearing seal 10 is incorporated in the bearing 1 as described above, the relative magnitude relationship between the seal groove 22 of the bearing outer ring 21 and the fitting portion 11 of the bearing seal 10 is, for example, as shown in FIG. When the inner diameter of the seal groove 22 is large (the groove is deep), a gap 22a is generated between the fitting portion 11 and the seal groove 22. However, the protrusion 12 extends through the gap 22a and passes through the gap in the seal groove 22. It reaches the portion 22b and comes into contact with the seal groove 22 so that the tip is elastically deformed and bent. Thus, the bearing 1 incorporating the bearing seal 10 can maintain the sealing performance by the seal and seal the inside of the bearing even when the seal groove 22 is relatively large and the fitting portion 11 is small. The leak prevention effect, waterproofness and dustproofness can be obtained with certainty.

  In addition, when the relative size relationship between the seal groove 22 of the outer ring 21 of the bearing and the fitting portion 11 of the bearing seal 10 is, for example, when the inner diameter of the seal groove 22 is small (the groove is shallow) as shown in FIG. The protrusion 12 is bent to the inclined surface 16 side so as to protrude from the inside of the seal groove 22 so as to be retracted to the outside. Thus, even when the seal groove 22 is relatively small and the fitting portion 11 is large, the protrusion 12 of the bearing seal 10 does not interfere with the fitting between the fitting portion 11 and the seal groove 22, and the inside of the bearing is Can be sealed.

  As shown in FIGS. 2 and 3, in the bearing 1 incorporating the bearing seal 10, the relative size relationship between the seal groove 22 and the fitting portion 11 is produced in the manufacture of the bearing seal 10 and the seal groove 22. This is because of dimensional changes due to dimensional errors during processing, thermal deformation during heat treatment, etc., especially due to changes in the inner diameter of the seal groove 22 due to the completion of seal groove processing. Thus, the influence of the above dimensional change can be mitigated, and the lubricant leakage prevention effect, waterproofness, and dustproofness can be improved as compared with the conventional products.

  Further, the size (volume) of the fitting portion 11 of the bearing seal 10 may be set smaller than the seal groove 22 at the design stage. Thus, as in FIG. 2, when the fitting portion 11 of the bearing seal 10 is inserted into the seal groove 22 of the outer ring 21, even when the inner diameter of the seal groove 22 is large due to the processing result of the seal groove 22. Since the protrusion 12 can be fitted securely and the inside of the bearing can be sealed, the lubricant leakage prevention effect, waterproofness, and dustproofness can be reliably obtained. Even when the inner diameter or the like of the seal groove 22 is smaller than the work finish, the size of the fitting portion 11 is set smaller than the seal groove 22 so that the seal groove 22 is filled with the fitting portion 11. Since it can be mounted without difficulty and the inside of the bearing can be sealed, the lubricant leakage prevention effect, waterproofness and dustproofness can be reliably obtained.

  Next, a molding die for manufacturing the bearing seal 10 of FIG. 1 will be described with reference to FIG. 4 is a cross-sectional view schematically showing a molding die for molding the bearing seal of FIG.

  A molding die 80 shown in FIG. 4 is composed of an upper die 81 and a lower die 82, and the upper die 81 and the lower die 82 are integrated with each other at a mating surface 84 so as to be integrated into the die for the bearing shown in FIG. A cavity 83 corresponding to the outer shape of the seal 10 is formed.

  The protrusions 12 of the bearing seal 10 are formed at the time of molding in a portion 85 of the cavity 83 shown in a circle in FIG. That is, the flat portion 86 of the mating surface 84 on the upper die 81 side corresponds to the flat portion 12a of the protrusion 12 extending from the lower end 16a of the inclined surface 16 of the bearing seal 10 in FIG. 1, and the mating surface 84 on the lower die 82 side. The chamfered portion 87 corresponds to the inclined portion 12 b of the protrusion 12. The chamfered portion 87 of the lower mold 82 can be easily processed by chamfering the mating surface 84 on the lower mold 82 side, and processing on the upper mold 81 side is unnecessary.

  The bearing seal 10 shown in FIG. 1 is manufactured by using the molding die 80 as shown in FIG. 4 and placing the core metal 14 shown in FIG. 1 in the cavity 83 in advance (insert molding) and performing injection molding using an elastic material. it can. At this time, the protrusion 12 of the bearing seal 10 in FIG. 1 is formed in a part of the cavity 83 formed by the flat portion 86 on the upper die 81 side and the chamfered portion 87 on the lower die 82 side.

  As described above, by performing injection molding using the molding die 80 of FIG. 4, the bearing seal 10 having the protrusions 12 can be easily manufactured, and the special cost due to the addition of the protrusions 12 is as follows. This is unnecessary and does not increase the manufacturing cost.

  Next, two modified examples of the bearing seal 10 of FIG. 1 will be described with reference to FIGS. FIG. 5 is a cross-sectional view of a bearing seal according to a first modification. FIG. 6 is a cross-sectional view of a bearing seal according to a second modification. In the bearing seals shown in FIGS. 5 and 6, the same parts as those shown in FIG.

  The bearing seal 30 shown in FIG. 5 changes the shape of the outer peripheral end of the seal as compared with the bearing seal 10 of FIG. 1, and the outer surface shape of the fitting portion 11 is inclined.

  The bearing seal 40 shown in FIG. 6 changes the shape of the seal outer peripheral end as compared with the bearing seal 10 of FIG. 1, and the outer surface shape of the fitting portion 11 is concave.

  According to the bearing seals 30 and 40 shown in FIGS. 5 and 6, the fitting portion 11 is inserted into the seal groove 22 of the outer ring 21 of the bearing as shown in FIGS. It can be incorporated into the bearing in such a manner that it can be fitted, and the same effects can be achieved. The bearing seals 30 and 40 in FIGS. 5 and 6 can be manufactured by injection molding using the same molding die as in FIG. 4 in which cavities corresponding to FIGS. 5 and 6 are formed.

  As described above, the best mode for carrying out the present invention has been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. For example, the bearing seals of FIGS. 1, 5, and 6 are of a type that fits on the outer ring side of the bearing, but the present invention is not limited to this and may be fitted on the inner ring side. . In addition, although a lip portion is provided at the seal end opposite to the fitting portion to make contact with the bearing side, a non-contact type may be used.

  The bearing to which the present invention is applicable may be a rolling bearing such as various radial ball bearings.

It is sectional drawing of the seal for bearings by this Embodiment. It is principal part sectional drawing of the bearing which shows the state which fitted the seal | sticker for bearings of FIG. 1 in the seal groove of the outer ring | wheel. It is principal part sectional drawing of the bearing which shows another state which fitted the seal | sticker for bearings of FIG. 1 in the seal groove of the outer ring | wheel. FIG. 2 is a cross-sectional view schematically showing a molding die for molding the bearing seal of FIG. 1. It is sectional drawing of the seal | sticker for bearings by the 1st modification of this Embodiment. It is sectional drawing of the seal | sticker for bearings by the 2nd modification of this Embodiment. It is sectional drawing which shows roughly the example which has arrange | positioned the seal | sticker for conventional types of bearings to the bearing. It is sectional drawing which shows the conventional seal for bearings. It is sectional drawing which shows the state which fitted the conventional seal | sticker seal of FIG. 8 in the seal groove | channel (inner diameter is smaller than usual) of the outer ring | wheel of a bearing. FIG. 9 is a cross-sectional view showing another state in which the conventional bearing seal of FIG. 8 is fitted in a seal groove (inner diameter larger than usual) of the outer ring of the bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bearing 10 Bearing seal | sticker, seal 11 Fitting part 12 Protrusion 12a Plane part 12b Inclination part 13 Lip part 14 Core metal 15 Peripheral part 16 Inclined surface 21 Outer ring 21a Inner surface 22 Seal groove 23 Inner ring 23a Outer surface 30, 40 Bearing seal 80 Molding die 81 Upper die 82 Lower die 83 Cavity 84 Mating surface 86 Flat portion 87 Chamfered portion

Claims (12)

A bearing seal disposed between an outer ring and an inner ring of the bearing,
A bearing seal comprising a protrusion protruding concentrically from a circumferential seal end.   The bearing seal according to claim 1, wherein the protrusion has a thickness smaller than a thickness of the seal end portion.   The said seal | sticker edge part has a fitting part fitted to the seal groove | channel provided in the said outer ring | wheel or the said inner ring | wheel, and the said protrusion protrudes in the circumferential shape from the vicinity of the said fitting part. Bearing seal.   The bearing seal according to claim 3, wherein a size of the fitting portion is set smaller than the seal groove.   5. The bearing seal according to claim 1, wherein the protrusion is formed by a chamfered portion formed on a die mating surface of a molding die of the bearing seal. 6. An outer ring, an inner ring, and a seal disposed between the outer ring and the inner ring,
The bearing is characterized in that the seal includes a protrusion concentrically protruding from a circumferential seal end.   The bearing according to claim 6, wherein the seal end portion has a fitting portion that fits into a seal groove provided in the outer ring or the inner ring.   The bearing according to claim 7, wherein the size of the fitting portion is set smaller than the seal groove.   The bearing according to claim 7 or 8, wherein when the seal groove is larger than the fitting portion, the protrusion contacts at least a part of the seal groove.   The bearing according to claim 7, wherein the protrusion protrudes from the seal groove when the seal groove is small with respect to the fitting portion.   The bearing according to any one of claims 6 to 10, wherein the protrusion is formed by a chamfered portion formed on a die mating surface of a molding die of the seal.   A molding die for molding the bearing seal according to any one of claims 1 to 5 or the seal according to any one of claims 6 to 11, wherein the mold corresponds to the protrusion. A molding die characterized by chamfering the die-mating surface.

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