公开(公告)号：US20240011572A1

公开(公告)日：2024-01-11

申请号：US18213357

申请日：2023-06-23

Applicant: TSUBAKIMOTO CHAIN CO.

Inventor： Yuichiro Ishikawa ,  Shogo Matsushita

IPC: F16K27/02 ,  F16K15/04

CPC classification number: F16K27/0209 ,  F16K15/044 ,  F16K27/0245

Abstract: To provide a simple-structured check valve unit that allows for retention of a seat relief in an attachment part of a plunger bore, facilitates production without increasing components, and prevents deformation of the plunger. The check valve unit includes the seat relief and a cap member. The plunger has an outlet relief hole in the attachment part for communication between the inside and outside of the plunger. The cap member includes a cap top, an oil flow portion, and a skirt wall. The skirt wall includes a plurality of outwardly raised contact surfaces and a plurality of inwardly raised contact surfaces. The circumscribed circle of the outwardly raised contact surfaces has a larger radius than the inside radius of the attachment part, and the inscribed circle of the inwardly raised contact surfaces has a smaller radius than the outside radius of an engaging part of the seat relief.

公开(公告)号：US12196334B2

公开(公告)日：2025-01-14

申请号：US18213357

申请日：2023-06-23

Applicant: TSUBAKIMOTO CHAIN CO.

Inventor： Yuichiro Ishikawa ,  Shogo Matsushita

IPC: F16K27/02 ,  F16K15/04

Abstract: To provide a simple-structured check valve unit that allows for retention of a seat relief in an attachment part of a plunger bore, facilitates production without increasing components, and prevents deformation of the plunger. The check valve unit includes the seat relief and a cap member. The plunger has an outlet relief hole in the attachment part for communication between the inside and outside of the plunger. The cap member includes a cap top, an oil flow portion, and a skirt wall. The skirt wall includes a plurality of outwardly raised contact surfaces and a plurality of inwardly raised contact surfaces. The circumscribed circle of the outwardly raised contact surfaces has a larger radius than the inside radius of the attachment part, and the inscribed circle of the inwardly raised contact surfaces has a smaller radius than the outside radius of an engaging part of the seat relief.