{
  "$type": "site.standard.document",
  "description": "A hydraulic pressure control device (3) is provided which is capable of pressure reduction and pressure increase by electronic control without changing over hydraulic circuits, and which is reliable and simple in structure, and a vehicle brake device using it is provided. A pressure chamber (33)…",
  "path": "/patents/1096206",
  "publishedAt": "2003-05-07T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60T8/00",
    "SUMITOMO SEI BRAKE SYS INC [JP]"
  ],
  "textContent": "A hydraulic pressure control device (3) is provided which is capable of pressure reduction and pressure increase by electronic control without changing over hydraulic circuits, and which is reliable and simple in structure, and a vehicle brake device using it is provided. A pressure chamber (33) and an offset spring (34) are added to a hydraulic pressure control valve (3) in which by moving a spool valve (32) to a position corresponding to brake operating force, thereby changing over connections between the output port (31b) and the discharge port (31c) and between the output port (31b) and the input port (31a) and adjusting the degrees of opening of valve portions, thereby controlling the hydraulic pressure at the output port to a value corresponding to the brake operating force. By introducing a pressure P1 adjusted by a pressure-adjusting valve (5) into the pressure chamber (33) and lowering the hydraulic pressure in the pressure chamber (33) in the range of P1 to 0 for pressure reduction by electronic control. Also, by opening a valve (12) and increasing the pressure in the pressure chamber (33) to the range of P1 to Pmax, pressure increase by electronic control is possible.",
  "title": "Hydraulic pressure control valve and vehicle brake device using the same"
}