Flow control valve seal and flow control valve device

Patent metadata

Field	Value
Publication number	US-11828385-B2
Application number	US-201917417363-A
Country	US
Kind code	B2
Filing date	Dec 24, 2019
Priority date	Dec 25, 2018
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

To provide a flow control valve seal that is manufactured at a low cost, that makes wear damage of a rotor with which the flow control valve seal slidably contacts less, and that is superior in its low leak performance, low friction performance, and low wear performance. A seal ( 6 ) is installed in a flow control valve device ( 1 ) including a housing ( 2 ) having an introduction part ( 5 ) that receives a cooling water from an internal combustion engine, and a resin rotor ( 4 ) disposed in the housing ( 2 ) and having a spherical outer peripheral surface ( 4 a ), the rotor ( 4 ) being rotated relative to the housing ( 2 ). The seal ( 6 ) is disposed between the introduction part ( 5 ) and the rotor ( 4 ) in the housing ( 2 ) and slidably contacts with the outer peripheral surface ( 4 a ) of the rotor ( 4 ). The seal ( 6 ) is an injection molded body of a resin composition having injection-moldable fluororesin as a base resin. The fluororesin is at least one resin selected from among a tetrafluoroethylene-perfluoro alkylvinyl ether copolymer resin, a tetrafluoroethylene-hexafluoropropylene copolymer resin, and a tetrafluoroethylene-ethylene copolymer resin.

First claim

The invention claimed is:

1. A flow control valve seal that is installed in a flow control valve device comprising a housing having an introduction part that receives a cooling water from an internal combustion engine and a discharge part that discharges the cooling water, and a resin rotor disposed in the housing and having an outer peripheral surface formed in a spherical or cylindrical shape, the resin rotor being rotated relative to the housing, wherein:
the flow control valve seal is disposed between the introduction part or the discharge part and the resin rotor in the housing;
the flow control valve seal is formed in a ring-like shape that slidably contacts with the outer peripheral surface of the resin rotor;
the cooling water is antifreeze solution;
the flow control valve seal is an injection molded body of a resin composition having injection-moldable fluororesin as a base resin;
the fluororesin is at least one resin selected from among a tetrafluoroethylene-perfluoro alkylvinyl ether copolymer resin, a tetrafluoroethylene-hexafluoropropylene copolymer resin, and a tetrafluoroethylene-ethylene copolymer resin; and the resin composition does not contain a fibrous filler.

2. The flow control valve seal according to claim 1 , wherein the resin composition contains a non-fibrous filler.

3. The flow control valve seal according to claim 1 , wherein the non-fibrous filler is graphite or PTFE resin, and
the resin composition contains 3-30 vol % of the non-fibrous filler to a whole of the resin composition and a residual part of the fluororesin.

4. The flow control valve seal according to claim 1 , further comprising a circumferential projection that is continuously formed along a whole circumference of the seal, on a ring-like sealing surface that slidably contacts with the resin rotor.

5. A flow control valve device comprising:
a housing having an introduction part that receives a cooling water from an internal combustion engine and a discharge part that discharges the cooling water;
a resin rotor disposed in the housing and having an outer peripheral surface formed in a spherical or cylindrical shape, the resin rotor being rotated relative to the housing; and
a flow control valve seal disposed between the introduction part or the discharge part and the resin rotor in the housing, the flow control valve seal being formed in a ring-like shape that slidably contacts with the outer peripheral surface of the resin rotor,
wherein:
the cooling water is antifreeze solution;
the flow control valve seal is an injection molded body of a resin composition having injection-moldable fluororesin as a base resin;
the fluororesin is at least one resin selected from among a tetrafluoroethylene-perfluoro alkylvinyl ether copolymer resin, a tetrafluoroethylene-hexafluoropropylene copolymer resin, and a tetrafluoroethylene-ethylene copolymer resin; the resin composition does not contain a fibrous filler; and
the resin rotor is an injection molded body of a resin composition having a polyphenylene sulfide resin as a base resin.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Yasuda Ken
• Ishii Takuya

Classifications

• F16K5/0464 Primary

  in the housing · CPC title

• F16J15/20

  Packing materials therefor · CPC title

• F16J15/3204

  with at least one lip · CPC title

• F16K5/0471

  between housing and plug · CPC title

• F16K5/0668

  Single packings · CPC title