{
  "$type": "site.standard.document",
  "description": "A timing chain (5) is looped over a driving sprocket (2) attached to a crankshaft (1) and driven sprockets (4) attached to camshafts (3). A pivotable chain guide (A 1 ) having a plurality of rotatable rollers (41) for guiding movements of the timing chain (5) is provided on one side of the slack…",
  "path": "/patents/974234",
  "publishedAt": "2014-06-04T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02B67/06",
    "NTN TOYO BEARING CO LTD [JP]"
  ],
  "textContent": "A timing chain (5) is looped over a driving sprocket (2) attached to a crankshaft (1) and driven sprockets (4) attached to camshafts (3). A pivotable chain guide (A 1 ) having a plurality of rotatable rollers (41) for guiding movements of the timing chain (5) is provided on one side of the slack side of the timing chain (5). Adjustment force of a chain tensioner is applied to a remote end of the chain guide remote from the center of pivoting movement of the chain guide, thereby pressing the rollers (41) against the timing chain (5). The ratio (D 1 /D 2 ) between the pitch circle diameter D 1 of the driving sprocket (2) and the outer diameter D 2 of the rollers (41) is determined within the range of 5/3 to 5/1. This prevents insufficient lubrication of the chain guiding rollers (41), makes it easy to lay out the engine.",
  "title": "CHAIN DRIVE DEVICE FOR CAMSHAFT DRIVE"
}