Bearing seal and rolling bearing with seal

Patent metadata

Field	Value
Publication number	US-9765822-B2
Application number	US-201514794887-A
Country	US
Kind code	B2
Filing date	Jul 9, 2015
Priority date	Jan 10, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A bearing seal is fitted into a seal groove formed in an outer race, and firmly mounted to the outer race. First detent ribs and second detent ribs are formed on both surfaces of one side of a seal base plate made of rubber and having the shape of a strip. When one side of the seal base plate is fitted into the seal groove formed in an inner diameter surface of the outer race, the first detent ribs and second detent ribs come into elastic contact with the side surfaces of the seal groove, respectively, so as to prevent the bearing seal from being pulled out of the seal groove.

First claim

What is claimed is:

1. A bearing seal comprising a strip-shaped seal base plate made of rubber and having a rectangular section,
wherein one side of the seal base plate is configured to be fitted into a seal groove formed in an inner diameter surface of an outer bearing race or formed in an outer diameter surface of an inner bearing race so that the bearing seal is made annular-shaped along the seal groove,
whereby a bearing space is sealed which is defined between the outer bearing race and the inner bearing race opposed to the outer race,
wherein the one side of the seal base plate configured to be fitted into the seal groove constitutes a fitting portion having two side surfaces, wherein detent ribs are formed on at least an outer side surface of the two side surfaces which is located closer to an open end of the bearing space,
wherein the detent ribs are spaced apart from each other in a width direction of the seal base plate, wherein the detent ribs are configured such that due to fitting of the fitting portion into the seal groove, distal ends of the respective detent ribs come into elastic contact with a side surface of the seal groove,
wherein heights of the detent ribs in a natural state thereof are predetermined such that the more rearward the detent ribs are located with respect to a direction in which the fitting portion is fitted into the seal groove, the larger the heights of the detent ribs are, and
wherein interferences between the side surface of the seal groove and the respective detent ribs are predetermined such that, with the fitting portion fitted in the seal groove, the more rearward the detent ribs are located with respect to the direction in which the fitting portion is fitted into the seal groove, the larger the interferences are,
wherein a radial positioning rib is formed on a side surface of the seal base plate that constitutes an outer side surface of the seal base plate when the seal base plate is mounted to one of the outer bearing race and the inner bearing race that is formed with the seal groove, and the radial positioning rib is configured to abut a circumferential surface of the one of the outer bearing race and the inner bearing race so as to control a fitting depth of the fitting portion in the seal groove,
wherein an axial positioning rib is formed on a side surface of the seal base plate that constitutes an inner side surface of the seal base plate when the seal base plate is mounted to the one of the outer bearing race and the inner bearing race that is formed with the seal groove, and the axial positioning rib is configured to come into contact with an inner side surface of the seal groove so as to axially position the seal base plate, and
wherein, with the seal base plate fitted into the seal groove, the seal base plate is kept out of contact with one of the inner bearing race and the outer bearing race that is not formed with the seal groove.

2. The bearing seal according to claim 1 , wherein the detent ribs comprise annular lips having the distal ends and being configured such that due to the fitting of the fitting portion into the seal groove, the distal ends of the respective annular lips are elastically deformed so as to be bent rearward, with respect to the direction in which the fitting portion is fitted into the seal groove, by coming into contact with the side surface of the seal groove, and such that due to the elastic deformation, the distal ends of the respective annular lips come into elastic contact with the side surface of the seal groove.

3. The bearing seal according to claim 1 , wherein the detent ribs comprise annular protrusions each having a circular arc-shaped section or a quadrangular section, and wherein the annular protrusions are configured such that due to the fitting of the fitting portion into the seal groove, the annular protrusions are elastically deformed in an axial direction by coming into contact with the side surface of the seal groove.

4. A rolling bearing with a bearing seal, the bearing comprising:
an outer race;
an inner race incorporated inwardly of the outer race; and
rolling elements incorporated between opposed portions of the outer race and the inner race,
wherein a seal groove is formed at an end portion of an inner diameter surface of the outer race or at an end portion of an outer diameter surface of the inner race,
wherein the bearing seal is a strip member made of rubber and having a side portion configured to be fitted from an end of the side portion into the seal groove so that the bearing seal is made annular-shaped along the seal groove,
whereby the bearing seal seals an opening of a bearing space defined between the opposed portions of the outer race and the inner race, and
wherein the bearing seal is the bearing seal according to claim 1 .

5. A bearing seal comprising a strip-shaped seal base plate made of rubber and having a rectangular section,
wherein one side of the seal base plate is configured to be fitted into a seal groove formed in an inner diameter surface of an outer bearing race or formed in an outer diameter surface of an inner bearing race so that the bearing seal is made annular-shaped along the seal groove,
whereby a bearing space is sealed which is defined between the outer bearing race and the inner bearing race opposed to the outer race,
wherein the one side of the seal base plate configured to be fitted into the seal groove constitutes a fitting portion having two side surfaces,
wherein detent ribs are formed on at least an outer side surface of the two side surfaces which is located closer to an open end of the bearing space,
wherein the detent ribs are spaced apart from each other in a width direction of the seal base plate,
wherein the detent ribs are configured such that due to fitting of the fitting portion into the seal groove, distal ends of the respective detent ribs come into elastic contact with a side surface of the seal groove,
wherein a radial positioning rib is formed on a side surface of the seal base plate that constitutes an outer side surface of the seal base plate when the seal base plate is mounted to one of the outer bearing race and the inner bearing race that is formed with the seal groove, and wherein the radial positioning rib is configured to abut a circumferential surface of the one of the outer bearing race and the inner bearing race so as to control a fitting depth of the fitting portion in the seal groove, and
wherein the radial positioning rib is formed with an adhesive supplying hole extending through a radial portion of the radial positioning rib into an open end portion of the seal groove.

Assignees

• Kanamoto Takahiro
• Inoue Wakana
• Ntn Toyo Bearing Co Ltd

Inventors

• Kanamoto Takahiro
• Inoue Wakana

Classifications

• F16C33/783 Primary

  of the mounting region · CPC title

• F16C19/06

  with a single row or balls · CPC title

• F16C2300/14

  Large applications, e.g. bearings having an inner diameter exceeding 500 mm · CPC title

• F16J15/3276

  with additional static sealing between the sealing, or its casing or support, and the surface on which it is mounted · CPC title

• F16C33/7846

  with a gap between the annular disc and the inner race · CPC title