{
  "$type": "site.standard.document",
  "description": "It is an object of the present invention to improve responsiveness in valve opening and valve closing of an electromagnetically-driven intake valve unit (200) in which a valve (203) is provided on a pressurizing chamber side of a valve seat (214S). The valve includes an annular abutting surface…",
  "path": "/patents/1003248",
  "publishedAt": "2012-04-18T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02M37/0023",
    "HITACHI AUTOMOTIVE SYSTEMS LTD [JP]"
  ],
  "textContent": "It is an object of the present invention to improve responsiveness in valve opening and valve closing of an electromagnetically-driven intake valve unit (200) in which a valve (203) is provided on a pressurizing chamber side of a valve seat (214S). The valve includes an annular abutting surface (203R) that abuts the valve seat (214S) to shut off a fuel intake passage and a bottomed cylindrical part (203F,203H) provided at an inner peripheral part of the annular abutting surface (203R). The bottomed cylindrical part (203F,203H) is inserted into a fuel introduction hole (214P) formed in the valve housing (214) inside the valve seat (214S), and the outer surface of an end part of the bottomed cylindrical part (203F,203H) is exposed to fuel in a low pressure fuel chamber (10A) provided upstream of the fuel introduction hole (214P). Thus, a low pressure is less produced upstream of the valve seat (214S) and thereby a static or dynamic fluid force of the fluid for biasing the valve (203) toward the valve opening direction is exerted on the entire outer surface of the valve (203), so that it is possible to provide a fast and stable valve opening speed of the valve (203).",
  "title": "High-pressure fuel supply pump having electromagnetically-driven intake valve"
}