IP Library › Granted Patent US 12687228
Granted Patent B2
US 12687228 · App. 18/730,953 · Granted Jul 21, 2026

Sealing device

Inventors: Yusuke Kamiya (Fukushima, JP); Masayuki Tanida (Fukushima, JP); Kokichi Hamamoto (Fukushima, JP); Hiroka Yamada (Fukushima, JP)
Assignee: NOK CORPORATION
F16J15/3232F16J15/162F16J15/3212F16J15/3284
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Quick Facts
Patent No.
US 12687228
App. No.
18/730,953
Granted
Jul 21, 2026
Kind
B2
Abstract

A sealing device is arranged between two relatively displaceable members containing an object to be sealed, for example, a drive shaft of an electric vehicle, and a housing for the drive shaft. A sealing body made of conductive rubber provided in the sealing device is fixed in a state of contact with the housing by an outer peripheral seal, and brings a sealing surface provided on a conductive lip into surface contact with the drive shaft to seal the object. A grease groove is provided on the sealing surface to retain grease having conductivity. The grease is filled between the drive shaft and the sealing surface, and forms a conducting circuit along with the sealing body which makes the drive shaft acting as an antenna for electromagnetic noise and the housing conductive.

Claims (33)

1 . A sealing device, comprising: a sealing body made of conductive rubber, which is fixed in a state of contact with one of two relatively displaceable members containing an object to be sealed and integrally has an annular conductive lip having a tip brought into contact with the other of the two members to seal the object; a sealing surface provided at the tip of the conductive lip to be brought into surface contact with the other member; grease having conductivity, which is filled between the sealing surface and the other member;

grease grooves provided in the sealing surface to retain the grease;

a connecting groove that connects the grease grooves; and

wherein the grease grooves and the connecting groove are formed in the sealing surface of the conductive lip.

2 . A sealing device, comprising: a sealing body made of conductive rubber, which is fixed in a state of contact with one of two relatively displaceable members containing an object to be sealed and integrally has an annular conductive lip having a tip brought into contact with the other of the two members to seal the object;

a sealing surface provided at the tip of the conductive lip to be brought into surface contact with the other member;

grease grooves provided in the sealing surface and retaining grease having conductivity in advance so that the grease is capable of being filled between the sealing surface and the other member;

a connecting groove that connects the grease grooves; and

wherein the grease grooves and the connecting groove are formed in the sealing surface of the conductive lip.

3 . A sealing device, comprising: a sealing body made of conductive rubber, which is fixed in a state of contact with one of two relatively displaceable members containing an object to be sealed and integrally has an annular conductive lip having a tip brought into contact with the other of the two members to seal the object; a sealing surface provided at the tip of the conductive lip to be brought into surface contact with the other member;

a grease supply portion configured to retain grease having conductivity in advance in grease grooves provided in the sealing surface and to fill the grease between the sealing surface and the other member;

a connecting groove that connects the grease grooves; and

wherein the grease grooves and the connecting groove are formed in the sealing surface of the conductive lip.

4 . The sealing device according to claim 1 , wherein the conductive lip has the sealing surface at the tip.

5 . The sealing device according to claim 4 , wherein the grease grooves are provided along a circumferential direction of the sealing surface.

6 . The sealing device according to claim 1 , wherein the sealing body integrally has an annular sealing lip which contacts and seals the other member on an interior side from the conductive lip.

7 . The sealing device according to claim 6 , including a fluid return portion which returns fluid leaked from the interior side to a surface on the atmosphere side of the sealing lip to the interior side by a screw pumping action,

wherein the connecting groove connects a space on the sealing lip side and a space on the atmosphere side.

8 . The sealing device according to claim 7 , wherein the fluid return portion is a thread groove provided in the surface on the atmosphere side of the sealing lip.

9 . The sealing device according to claim 7 , wherein the fluid return portion is a thread protrusion provided on the surface on the atmosphere side of the sealing lip.

10 . The sealing device according to claim 1 , wherein the sealing body integrally has an annular dust lip closer to the atmosphere side than the conductive lip.

11 . The sealing device according to claim 2 , wherein the conductive lip has the sealing surface at the tip.

12 . The sealing device according to claim 11 , wherein the grease grooves are provided along a circumferential direction of the sealing surface.

13 . The sealing device according to claim 3 , wherein the conductive lip has the sealing surface at the tip.

14 . The sealing device according to claim 13 , wherein the grease grooves are provided along a circumferential direction of the sealing surface.

15 . The sealing device according to claim 2 , wherein the sealing body integrally has an annular sealing lip which contacts and seals the other member on an interior side from the conductive lip.

16 . The sealing device according to claim 15 , including a fluid return portion which returns fluid leaked from the interior side to a surface on the atmosphere side of the sealing lip to the interior side by a screw pumping action,

wherein the connecting groove connects a space on the sealing lip side and a space on the atmosphere side.

17 . The sealing device according to claim 3 , wherein the sealing body integrally has an annular sealing lip which contacts and seals the other member on an interior side from the conductive lip.

18 . The sealing device according to claim 17 , including a fluid return portion which returns fluid leaked from the interior side to a surface on the atmosphere side of the sealing lip to the interior side by a screw pumping action,

wherein the connecting groove connects a space on the sealing lip side and a space on the atmosphere side.

19 . The sealing device according to claim 2 , wherein the sealing body integrally has an annular dust lip closer to the atmosphere side than the conductive lip.

20 . The sealing device according to claim 3 , wherein the sealing body integrally has an annular dust lip closer to the atmosphere side than the conductive lip.