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公开(公告)号：US10107368B2
公开(公告)日：2018-10-23
申请号：US15325539
申请日：2015-07-13
Applicant: NTN CORPORATION
Inventor： Kouichi Onimaru , Tasuku Furukawa
Abstract: A chain tensioner is provided which is configured such that the air remaining in a pressure chamber can be discharged to the outside through a helical gap defined between a screw and a threaded hole, and through between circumferentially separate radial ends of a spring washer mounted between the screw and a housing. The chain tensioner includes an air discharge groove or grooves formed in the seat surface of the head of the screw such that an annular space defined between the neck of the screw and the inner diameter surface of the spring washer communicates with the outside through the air discharge groove or grooves. Even if foreign objects clog the space between the separate radial ends so as to hinder air from being discharged through between the separate radial ends, the air remaining in the pressure chamber can be discharged to the outside through the air discharge groove or grooves.
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公开(公告)号：US12064993B2
公开(公告)日：2024-08-20
申请号：US17618738
申请日：2020-06-16
Applicant: NTN Corporation
Inventor： Tasuku Furukawa , Shun Tamaki
IPC: B60B27/00 , F16C19/18 , F16J15/3232
CPC classification number: B60B27/0094 , B60B27/0005 , F16C19/183 , F16J15/3232 , B60B2380/12 , B60B2380/75 , F16C2326/02
Abstract: A bearing device for a wheel, which has improved axial assembly accuracy of a sealing member by reducing the amount of springback. The bearing device for a wheel comprises an inner sealing member that blocks an inner opening end of an annular space formed by an outer ring and an inner ring. A sealing ring of the inner sealing member has a core metal fitting in the outer ring and an elastic member joined to the core metal. The elastic member has: a pressing part that is pressed inward in the axial direction when the sealing ring is press-fitted into the outer ring; and a non-pressing part that is not pressed inward in the axial direction when the sealing ring is press-fitted into the outer ring, wherein the axial thickness of the pressing part is thinner than the axial thickness of the non-pressing part.
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公开(公告)号：US10550916B2
公开(公告)日：2020-02-04
申请号：US15514960
申请日：2015-09-28
Applicant: NTN CORPORATION
Inventor： Tasuku Furukawa , Seiji Sato
Abstract: A chain tensioner includes an oil supply passage for supplying hydraulic oil into a pressure chamber defined by a cylinder and a plunger, and a check valve provided at the end of the oil supply passage. A leak gap is defined between the sliding surfaces of the cylinder and the plunger. The plunger is biased by a return spring in the direction in which the plunger protrudes out of the cylinder. A plug is press-fitted in a cylindrical inner periphery of a through hole formed in the plunger to extend from a protruding end surface of the plunger to the pressure chamber to define an air vent passage. It is possible to change the hydraulic damper force simply by replacing the plug with another different type of plug to define a different air vent passage.
