Flap valve apparatus
AssigneePiolax, Inc.
InventorTomotaka Masaki
Life of this patent
Estimating the term…
Abstract
A flap valve apparatus includes a main body; a valve body; and a spring member. The main body includes support shafts, and the valve body includes bearing portions. When viewed from the axial direction of the support shaft, the bearing portions has a bearing hole with an inner diameter larger than the outer diameter of the support shaft; and an introduction groove being in communication with the bearing hole from the seal surface side of the valve body. A width of the introduction groove is smaller than the outer diameter of the support shaft, but is expandable to receive the support shaft. When viewed from the axial direction of the support shaft, an opening portion of the introduction grove is positioned near the axial center of the main body.
Claims17
A flap valve device including:
- a cylindrical-shaped main body including a liquid flow passage formed thereinside;
- a flap-shaped valve element attached in an openable and closable manner to a one-end opening portion of the cylindrical-shaped main body;
- and
- a spring member arranged to normally urge the valve element in a closing direction toward the one-end opening portion of the cylindrical-shaped main body,
- wherein the cylindrical-shaped main body includes
- a supporting shaft arranged to pivotally support the valve element in an openable and closable manner,
- wherein the valve element includes
- a bearing portion into which the supporting shaft is inserted,
- wherein the bearing portion includes
- a bearing hole into which the supporting shaft is inserted to be supported, and which has an inside diameter larger than an outside diameter of the supporting shaft, when seen from an axial direction of the supporting shaft, and
- a lead groove having an opening portion open to a seal surface side of the valve element, and being in communication with the bearing hole via a passage, the passage having a width smaller than the outside diameter of the supporting shaft and being elastically expandable to thereby allow the supporting shaft to be introduced into the bearing hole, and
- wherein the opening portion of the lead groove for the bearing hole is positionally shifted toward an axial center of the cylindrical-shaped main body with respect to an axial center of the bearing hole when seen from the axial direction of the supporting shaft in a state where the one-end opening portion of the cylindrical-shaped main body is closed with the valve element,
- wherein one end of the bearing portion around the opening portion of the lead groove is coupled to a main body of the valve element, and the other end of the bearing portion around the opening portion of the lead groove is disposed so as to be separated from the main body of the valve element rather than the one end of the bearing portion,
- wherein there is provided a band-shaped portion that extends from the one end of the bearing portion or the main body of the valve element and is coupled to the other end of the bearing portion, and
- wherein the band-shaped portion extends from the bearing portion outward in a radial direction of the valve element so as not to obstruct an insertion of the supporting shaft into the lead groove when seen from the seal surface side of the valve element.
Dependencies are inferred from the claim text.