{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "A damping force change mechanism (70) includes an on-off valve (71) located in the through hole (65) of a piston rod (19). The on-off valve (71) opens/closes a third hydraulic oil passage (72) that allows a first oil chamber (36) on a free piston side and a second oil chamber (37) between a first…",
  "path": "/patents/934870",
  "publishedAt": "2016-11-16T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60G21/073",
    "YAMAHA MOTOR CO LTD [JP]"
  ],
  "textContent": "A damping force change mechanism (70) includes an on-off valve (71) located in the through hole (65) of a piston rod (19). The on-off valve (71) opens/closes a third hydraulic oil passage (72) that allows a first oil chamber (36) on a free piston side and a second oil chamber (37) between a first piston (31) and a second piston (32) to communicate with each other. The on-off valve (71) includes an expanded diameter portion (74) extending in the first oil chamber (36) outward in the radial direction. The expanded diameter portion (74) is formed into a shape capable of facing the whole opening edge of the through hole (65) and tightly contacting an end face (19c) of the piston rod (19). The magnitude of a damping force can easily be changed, and a damping force characteristic in a case in which the damping force is large stabilizes.",
  "title": "VIBRATION DAMPING DEVICE FOR VEHICLE BODY"
}