DE112016004295T5 - Bearing gasket and extraction tool - Google Patents

Abstract

The present invention provides a seal for a bearing, the seal having a rubber part made of rubber, the sealing lips (1 and 2) and cover (13); and an annular metal core (4) to which the rubber member adheres, and having an annular plate portion (10) formed with holes (12) extending axially through the annular plate portion (10) and circumferentially spaced from each other are. The metal core has plate thickness surfaces (14) defining the respective holes (12). The lids (13) adhere to the respective plate thickness surfaces (14) over an entire circumference thereof and completely close the corresponding holes (12). An outer gap (15) is defined between each lid (13) and the corresponding plate thickness surface (14) so as to separate the outer surface of the lid (13) along the entire circumference of the plate thickness surface (14) from a portion of the rubber part of the seal. which differs from the lid (13). An inner gap (17) is defined between each lid (13) and the corresponding plate thickness surface (14) so as to separate the inner surface of the lid (13) along at least half of the entire circumference of the plate thickness surface (14) from the portion of the rubber part which differs from the lid (13).

Description

TECHNICAL PART

The present invention relates to a gasket used for sealing a rolling bearing and an extractor used to remove the gasket from a bearing race of the rolling bearing.

STATE OF THE ART

In general, gaskets for a bearing include a rubber part made of rubber and having a sealing lip and an annular metal core to which the rubber part adheres and which is press-fitted to a bearing bearing race of the bearing and mounted on the bearing.

There is proposed a gasket for a bearing that can be easily disassembled from the bearing and includes holes that extend axially through the annular plate portion of the metal core and are circumferentially spaced from each other; and lids that close the respective holes and partially form the rubber part of the seal. Such a seal can be pulled out of a bearing race of the bearing by opening holes from the outside of the bearing; Inserting the hook portions of an extractor through the respective holes; Hooking the hook portions on the seal from the inside of the bearing; and axially moving the hook portions. As such an extracting device, a puller for extracting a gear, a pulley, a bearing, etc. is used (refer to Patent Documents 1 and 2 below).

DOCUMENTS OF THE PRIOR ART

PATENT DOCUMENTS

• Patent Document 1: Publication of the Unexamined Japanese Patent Application No. H09-317897 (especially 6 , Paragraph 0039)
• Patent Document 2: Publication of Unexamined Japanese Patent Application No. 2008-281025 (especially 2 and 3 , Paragraph 0030)

OVERVIEW OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

When the holes of the annular plate portion are completely closed by the respective lids, as in the gasket for a bearing disclosed in Patent Document 1, it is possible to eliminate the risk that foreign matter gets into the bearing through the holes, and the To ensure sealing performance of the seal. However, it is necessary that the covers be pierced or cut out with a sharp-edged tool or blade tool to open / form holes. If holes are opened in this way, the internal components of the bearing, such as the holder or the rolling elements, may be damaged or destroyed.

On the other hand, when cutting lines are formed in advance in the respective covers, as in the gasket for a bearing disclosed in Patent Document 2, it is not necessary to open holes in the above manner. However, due to a change in pressure inside the bearing during operation, the cut lines could broaden so that foreign matter could be sucked into the bearing through the broadened cut lines.

In view of background, it is an object of the present invention to provide a gasket for a bearing capable of ensuring its sealing performance and preventing the bearing from being damaged or destroyed when opening holes for pulling out the gasket ,

MEANS OF SOLVING THE PROBLEMS

In order to achieve the above object, the present invention provides a gasket for a bearing, the gasket comprising: a rubber-made rubber member comprising a sealing lip and covers; and an annular metal core to which the rubber member adheres and having an annular plate portion formed with holes extending axially through the annular plate portion and circumferentially spaced from each other; characterized in that the annular metal core has plate thickness surfaces defining the respective holes, each of the lids being adapted to adhere to a respective one of the plate thickness surfaces over an entire circumference of the plate thickness surface and completely close a corresponding one of the holes, with an outer gap is defined between each of the lids and a corresponding one of the plate thickness surfaces so as to separate an outer surface of the lid along the entire circumference of the plate thickness surface from a portion of the rubber member different from the lid, and an inner gap between each of the lids and a corresponding one the plate thickness surfaces is defined so as to separate an inner surface of the lid along at least half of the entire circumference of the plate thickness surface from the portion of the rubber member which is different from the lid.

With this arrangement, since the lids adhere to the respective plate thicknesses, define holes over their entire peripheries and completely close the respective holes, sealing performance of the gasket is ensured, and the lids need not be connected to the portion of the rubber part of the gasket other than that shown in FIG differentiates the lids. In addition, since the outer surfaces of the lids are separated by the outer gaps along the entire peripheries of the respective plate thicknesses from the portion of the rubber part of the gasket other than the lids, and the inner surfaces of the lids are respectively along at least half of the entire circumference of the corresponding plate thickness surface from the portion of the rubber parts of the gasket other than the covers are separated by the corresponding inner gap, it is possible to easily find the positions of the caps from the outside of the bearing by confirming the outer gaps and the thin ones Sticking portions between the lids and the respective plate thickness surface of the plate thickness surfaces simply by slightly pressing the lid in the axial direction of the outside of the bearing to solve. Therefore, it is not necessary to pierce or cut the covers with a sharp-edged tool or a blade tool to open / form holes

EFFECTS OF THE INVENTION

As described above, in the gasket for a bearing of the present invention, the caps completely close the respective holes formed in the annular plate portion of the metal core, and it is not necessary to seal the caps using a sharp-edged tool or a blade tool to pierce or cut out to open / form holes, the sealing performance of the seal is ensured. Even if the gasket could be damaged if the caps were pierced or cut in this way, such a risk is eliminated in the gasket of the present invention.

list of figures

• 1A Figure 11 is a sectional view of a gasket used for a bearing and embodying the present invention.
• 1B is a sectional view of a portion of the seal, wherein the in 1A holes are open.
• 2A is an enlarged side view of a peripheral portion of the seal of 1A , seen from the outside of the camp.
• 2 B is an enlarged side view of the part of the seal of 1A near a lid, seen from the inside of the warehouse.
• 3 Figure 11 is a sectional view of an extractor embodying the present invention.
• 4 Figure 11 is a front view of one of the hook portions of the puller embodying the present invention.
• 5 is a top view of the in 3 shown extractor.
• 6 is a sectional view showing that the seal using the in 3 pulled extractor is pulled out.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will now be described with reference to the drawings. 1A FIG. 12 illustrates a gasket for a bearing embodying the present invention, which includes a rubber rubber part and sealing lips 1 and 2 and a waist section 3 includes; and a metal core 4 to which the rubber part adheres. In the embodiment, the seal for a rolling bearing 5 used that has an outer bearing race 7 and inner bearing races 6 having. In particular, the seal is at one end of the inner circumference of the bearing race 7 so attached, that the inside and outside space of the rolling bearing 5 separated by the seal. The sealing lips 1 and 2 of the seal cooperate with a sealing surface 8, which on one of the inner bearing races 6 is arranged, thereby allowing the seal as an oil seal for sealing the rolling bearing 5 serves.

The bearing seal is designed so that the center axis of the seal with the center axis of the bearing 5 coincides. The direction along the central axis of the rolling bearing 5 hereinafter simply referred to as "axial direction"; the direction perpendicular to the central axis of the rolling bearing 5 hereinafter simply referred to as "radial direction"; and the direction about the center axis of the rolling bearing 5 is hereinafter simply referred to as "circumferential direction". Although the rolling bearing 5 to which the seal is attached, in this embodiment a tapered roller bearing, the seal may be attached to any type of bearing, such as a cylindrical roller bearing or a ball bearing.

The metal core 4 the seal comprises an annular plate portion 10 which extends circumferentially over its entire circumference; and a flange 11 extending axially from the outer periphery of the annular plate portion 10 extends. Usually the metal core 4 an integral element formed by pressing.

The waist section 3 spans the annular plate section 10 of the metal core 4 and adheres to the annular portion 10 , The sealing lips 1 and 2 are tongue-shaped sections that extend from the waist section 3 extend to the sealing surface 8 out. Although two radial lips are shown, the number of lips is not limited and the single lip or lips may be either a radial lip or an axial lip and may be either in or out of contact with the sealing surface 8.

The flange 11 of the metal core 4 is at one end of the inner circumference of the bearing race 7 secured by press-fitting so that the seal on the bearing race 7 is appropriate.

As in 1B represented is the metal core 4 with holes 12 formed, extending axially through the annular plate portion 10 extend and are spaced apart in the circumferential direction. As in 1A and 2A shown, the rubber part of the seal continues to cover 13 made of the same rubber material as the sealing lips 1 and 2 and the waist section 3 forming rubber material are made, and the respective holes 12 close. The holes shown 12 are two elongated holes, each having a long central axis in the direction along the tangent to the outer periphery of the annular plate portion 10 at the point of the hole 12 corresponds, and are arranged at the same distance from each other in both circumferential directions.

The plate thickness of the metal core 4 and the shapes and arrangements of the holes 12 are with respect to those for the metal core 4 required mechanical strength; the configuration of an extractor used to release the seal from the bearing; the amount of external force exerted on the gasket when it is pulled out of the bearing; and the difficulty in forming the lid 13 and the holes 12 suitably set, so that when the seal is pulled out of the bearing, the material of the seal around the holes 12 not overly deformed.

For example, the holes can 12 be round holes, square / rectangular holes or elliptical holes, or there may be three or more holes 12 be arranged in the circumferential direction.

The metal core 4 has plate thickness areas 14 that the respective holes 12 completely surrounded and defined. The lids 13 Adhere to the respective plate thickness surfaces 14 over the entire circumference of the plate thickness surfaces 14 and close the respective holes 12 Completely.

An outer gap 15 is between each lid 13 and the corresponding plate thickness area 14 defined so as to define the outer surface of the lid as defined below 13 along the entire circumference of the plate thickness area 14 from the portion of the rubber part of the gasket extending from the lid 13 different (eg the waist section 3 ) to separate. The above-mentioned outer surface of the lid 13 refers to the part of the surface of the lid that is exposed to the outside of the bearing when the hole 12 projected on an axial plane. The outer gap 15 has the shape of a slot that extends axially over the outer surface 16 of the annular plate portion 10 is also excluded.

As in 1A and 2 B shown is an inner gap 17 between each lid 13 and the corresponding plate thickness area 14 defined to the inner surface of the lid defined below 13 along at least half of the entire circumference of the plate thickness area 14 from the portion of the rubber part of the gasket extending from the lid 13 distinguishes, to separate. The above-mentioned inner surface of the lid 13 refers to the part of the surface that is exposed to the interior of the bearing when the hole 12 projected onto an axial plane. The inner gap 17 has the shape of a slot that extends axially over the inner surface 18 of the annular plate portion 10 is also excluded.

As in 1A is shown, the axial length (thickness) of the adhesive portion of the lid 13 , the at the plate thickness area 14 adheres to, smaller (thinner) than the axial length of the plate thickness surface 14 , The axial thickness of the adhesive portion of the lid 13 , and the axial depths of the outer and inner column 15 and 17 are adjusted to the adhesion of the lid 13 at the plate thickness area 14 can be maintained under a maximum pressure change inside the bearing, the rolling bearing 5 can withstand.

The rubber part of the seal further comprises connecting portions 19 that are integral with the inner surfaces of each lid 13 are connected and on the inner surface 18 of the annular plate portion 10 adhere. Every inner gap 17 is defined to be partially (not completely) the plate thickness area 14 surrounds, leaving the corresponding connection section 19 integral with the portion of the inner surface of the lid 13 is connected, which defines no inner gap. The connecting section 19 extends along one of the two straight sections of one of the two parallel sides of the plate thickness area 14 , Therefore, bends when the lid 13 is pressed axially from the outside of the seal and the adhesion between the lid 13 and the plate thickness area 14 is interrupted, as is in 1B is shown, the lid 13 toward the interior of the bearing around the connecting portion 19 while passing through the connecting portion 19 on the metal core 4 is attached.

The rubber part of the seal, which is made of the sealing lips 1 and 2 , the waist section 3, the lids 13 and the connecting sections 19 can be formed in a shape in which the metal core 4 is arranged so that when the rubber part is formed in the mold, the rubber part at the same time by vulcanizing with the metal core 4 can be connected. The rubber part of the gasket is made of rubber for oil seals such as nitrile rubber, silicone rubber or fluororubber.

3 FIG. 12 illustrates an extraction device embodying the present invention used to seal the above-described seal from the bearing race. FIG 7 to decrease. The puller comprises tie rods 100 by which tensile forces are exerted on the seal; a support element 101 for axially and radially positioning the tie rods 100 relative to the bearing race 7 ; and nuts 102 that are used to the respective tie rods 100 relative to the support element 101 and the bearing race 7 to move axially.

The tie rods 100 each consist of a hook portion 103; a coupling shaft portion 104; a screw 105 with which the hook portion 103 and the coupling shaft portion 104 are fixed to each other; and a male threaded portion 106 connected to the coupling shaft portion 104 and the corresponding nut 102 can be brought into threaded engagement.

The support element 101 consists of a receiving plate section 108 that with openings 107 provided that they are the respective holes 12 facing the seal and through which the respective male threaded portions 106 axially insertable; holder sections 109 which are adapted to receive the receiving plate portion 108 relative to the bearing race 7 hold; and screws 110 with which the holder sections 109 and the receiving plate portion 108 attached to each other.

As in 3 and 4 1, each hook portion 103 includes an axially extending flat plate portion and a distal end surface bent radially from the axially extending flat plate portion, as shown in FIG 3 shown, the flat plate portion at the lower end portion in 3 of the coupling shaft portion 104 is fixed by the screw 105. As in 1B and 3 As shown, the distal end surfaces of the hook portions 103 are arcuate surfaces axially into the respective holes 12 can be used. Since the distal end surfaces of the hook portions 103 are arcuately curved surfaces, even if the hook portions 103 are too deep in the holes 12 are introduced, the distal end faces not the inner components of the bearing, such as the holder.

As in 3 shown, the coupling shaft portions 104 each at its upper end (in 3 ) has a female threaded portion into which the lower end of one of the male threaded portions 106 , which are threaded bolts, can be screwed in such that the male threaded portion 106 is fixedly connected to the coupling shaft portion 104.

The external thread sections 106 are axially through the respective openings 107 of the receiving plate portion 108 Inserted so that they are up over the top of the receiving plate section 108 protrude out. The nuts 102 are in 3 on the respective external thread sections 106 screwed from their upper ends.

As in 3 and 5 shown are the holder sections 109 a pair of legs that are designed to fit with the bearing race 7 come into contact, whereby the receiving plate section 108 relative to the bearing race 7 is held radially and axially. The holder sections 109 have ends (lower ends in 3 ) arranged and arranged by fitting the ends to the mating surface of the bearing race 7 the ends with both the mating surface and the side surface of the bearing race 7 may be in abutment with the circumferential centers of the respective ends located on a common diametrical line of the mating surface. By thus placing the lower ends of the legs in abutment, the legs are radially and axially relative to the bearing race 7 positioned.

The openings 107 through which the respective male threaded sections 106 are introduced, are radially elongated holes. The receiving plate section 108 is further provided with openings 111 through which the respective bolts 110 for fixing the receiving plate portion 108 at the holder sections 109 are inserted, and the openings 111 are also radially elongated holes along the openings 107 , Because the openings 107 and 111 are radially elongated holes, it is possible the support positions of the tie rods 100 and the Legs (holder sections 109 ) relative to the receiving plate portion 108 adjust. Therefore, the extraction device of the present invention can be used for gaskets differing in major dimensions from each other and / or gaskets attached to rolling bearings different in main dimensions from each other

To the seal of the rolling bearing 5 using the puller of the present invention, for example, the rolling bearing 5 arranged horizontally, as in 3 shown. Thereafter, using only the hook portions 103, the lids 13 (please refer 1A ) are axially pressed from the outside of the bearing by their distal end faces, so that the adhesion between the covers 13 and the respective panel thickness area 14 is interrupted and, as in 1B shown the lids 13 to the interior of the bearing around the connecting sections 19 be bent so that the holes 12 are open and the hook sections 13 be inserted into the opened holes 12. Subsequently, the support element 101 on the bearing race 7 from the top of the bearing race 7 placed. Thereafter, the coupling shaft portions 104 and the hook portions 103, which are now in the opened holes 12 are fastened by the screws 105 attached to each other, wherein the tie rods 100 on the receiving plate portion 108 with / through the nuts 102 are held. After that, the tie rods 100 as needed along the respective openings 107 moved so that the hook portions 103 are hooked in a suitable manner to the seal. If then the nuts 102 are rotated due to the axial forces at that time on the external thread sections 16 be exercised as in 6 shown, the tie rods 100 in their entirety relative to the support element 101 and the bearing race 7 moved axially upward so that the seal axially through the hook portions 13 is pulled. If then the nuts 102 continues to be gradually turned, the seal is out of the bearing race 7 pulled out.

There, as in 1A shown the lids 13 at the respective plate thickness surfaces 14, the holes 12 define over the entire circumference of the plate thickness surfaces 14 cling and the respective holes 12 completely close, the sealing performance of the seal is ensured according to the present invention.

Because the outer column 15 the outer surfaces of the lid 13 along the entire circumference of the respective plate thickness surfaces 14 separate from the portion of the rubber part of the gasket extending from the lids 13 different, and every inner gap 14 the inner surface of the corresponding lid 13 along at least half of the entire circumference of the corresponding panel thickness area 14 separates from the portion of the rubber part of the gasket extending from the lid 13 It is possible to change the positions of the lids 13 from the outside of the bearing easy to determine by the outer column 15 visually confirmed, and the thin adhesion between the lids 13 and the respective panel thickness area 14 simply by lightly pressing the lid 13 to release in the axial direction from the outside of the bearing. This eliminates the need to pierce or cut the lids by using a sharp-edged tool or a blade tool to open / form holes for pulling out the seal, thereby preventing damage to the bearing if the lids were pierced or cut out in this manner.

Because the connecting sections 19 the seal of the present invention, which on the inner surface 18 of the annular plate portion 10 Adhere, made of rubber and integral with the inner surfaces of the respective lid 13 are connected, it is when the lids 13 pressed and the holes 12 be opened, possible to prevent the lid 13 completely from the metal core 4 be separated and fall into the interior of the camp (see 1B ).

Since the extraction device of the present invention, as in 3 and 4 shown, tie rods 100 , the hook sections 103, which are in the respective holes 12 the seal can be used, and male threaded sections 106 has, which are axially movable together with the respective hook portions 103; a support element 101 Having a mounting plate section 108 that with openings 107 is formed, which are arranged opposite to the respective holes 12 and through which the respective external thread sections 106 axially insertable, and holder sections 109 which are designed to be in contact with the bearing race 7 come to which the seal is attached, whereby the receiving plate section 108 radially and axially relative to the bearing race 7 is held; and nuts 102 includes, with the respective male threaded sections 106 from the bearing race 7 remote / remote side of the receiving plate portion 108 can be screwed, in contrast to a conventional puller, the puller according to the present invention, the seal from the bearing race 7 even if the bearing race 7 inside the bearing race 7 does not include a shaft member that can receive the extractor.

Since the holder sections 109 of the support element 101 the puller according to the present invention using the mating surface of the outer bearing race 7 can be held, in contrast to an extractor, using the mating surface of the inner bearing race 6 held, the extraction device of the present invention are also used for rolling bearings with smaller diameters.

The above embodiments are merely examples in all respects, and the present invention is not limited to the above embodiments. Therefore, the scope of the present invention is indicated not by the above description but by the claims, it being understood that all modifications are included within the scope and meaning which come within the scope of the claims.

LIST OF REFERENCE NUMBERS

1, 2:

sealing lip

3:

waist section

4:

metal core

5:

roller bearing

6, 7:

Bearing race

10:

annular plate section

12:

hole

13:

cover

14:

Plate thickness surface

15:

outer gap

16:

outer surface

17:

inner gap

18:

inner surface

19:

connecting portion

100:

pull bar

101:

supporting member

102:

mother

106:

Externally threaded section

107:

opening

108:

Receiving plate section

109:

holder section

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP H09317897 [0003]
• JP 2008281025 [0003]

Claims (3)

A gasket for a bearing, the gasket comprising: a rubber-made rubber member comprising a sealing lip and a lid; and an annular metal core to which the rubber member adheres and having an annular plate portion formed with holes extending axially through the annular plate portion and circumferentially spaced from each other; characterized in that the annular metal core has plate thickness surfaces defining the respective holes, each of the lids being adapted to adhere to a respective one of the plate thickness surfaces over an entire circumference of the plate thickness surface and completely close a corresponding one of the holes, with an outer gap is defined between each of the lids and a corresponding one of the plate thickness surfaces so as to separate an outer surface of the lid along the entire circumference of the plate thickness surface from a portion of the rubber member different from the lid, and an inner gap between each of the lids and a corresponding one the plate thickness surfaces is defined so as to separate an inner surface of the lid along at least half of the entire circumference of the plate thickness surface from the portion of the rubber member which is different from the lid. Seal after Claim 1 wherein the rubber part further comprises connecting portions which are integrally connected to the inner surfaces of the respective lids and adhere to an inner surface of the annular plate portion. An extraction device comprising: tie rods, the hook portions following into the respective holes of the seal Claim 1 or 2 insertable, and externally threaded portions which are axially movable together with the respective hook portions; a holding member having a receiving plate portion provided with openings adapted to oppose the respective holes and through which the respective male threaded portions are axially insertable, and holder portions adapted to radially and radially engage the receiving plate portion holding axially relative to a bearing race of a bearing to which the bearing seal is attached when the holder portions are brought into contact with the bearing race of the bearing; and nuts that can be screwed to the respective male threaded portions of one of the two sides of the female plate portion opposite to the bearing race.

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