{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
    "ref": {
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  "description": "A master cylinder includes: a cylinder housing; a piston which is movably disposed in the cylinder housing so as to form a pressure chamber and a hydraulic fluid supplying chamber; and a sealing member which is interposed between the cylinder housing and the piston. An indentation portion is…",
  "path": "/patents/922047",
  "publishedAt": "2017-08-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60T11/16",
    "ERAE AUTOMOTIVE SYSTEMS CO LTD [KR]"
  ],
  "textContent": "A master cylinder includes: a cylinder housing; a piston which is movably disposed in the cylinder housing so as to form a pressure chamber and a hydraulic fluid supplying chamber; and a sealing member which is interposed between the cylinder housing and the piston. An indentation portion is provided on an outer circumferential surface of the piston, and wherein a rear wall of the indentation portion is formed as a slanted surface. A plurality of first communication holes are formed on a bottom surface of the indentation portion and a second communication hole is formed on the rear wall of the indentation portion. According to the present invention, since the second communication holes which act as drag prevention passageway are formed on the rear walls which are slanted surfaces, an angle with which the sealing members collide with the edges of the second communication holes is reduced, so the damage of the sealing members can be reduced.",
  "title": "MASTER CYLINDER FOR VEHICLE"
}