| 摘要 |
973,420. Friction clutches; change speed control. TWIN DISC CLUTCH CO. Oct. 3, 1961 [March 13, 1961], No. 35645/61. Headings F2C and F2D. In a multiplate friction clutch 28, wherein pressure oil is supplied to cylinder chambers 57, 66 on opposite sides of a reaction piston 16 secured to a driving (or driven) shaft 10 to axially move a cylinder 22 integral with a presser plate 20 into clutch engaging and disengaging positions, cooling oil is supplied to the inner edges of the friction plates through a passage 70 comprising a valve closure ring 74 which when the cylinder 22 is in its disengaged position is held by a shoulder 75 thereon to substantially close the passage 70 outlet thereby minimizing clutch drag and excessive floating of the disengaged plates, and when the cylinder is moved towards, and is in, its engaged position is freed to open the passage 70. Oil leakage past the valve ring 74 is sufficient for lubrication of the friction plates when disengaged, such leakage being increased, if necessary, by grooving the ring (Fig. 5, not shown). In the double clutch 28, 29 shown, for a forward and reverse or change-speed gear, clutch driven members 31, 36 are integral with gears 32, 37. The cylinders 22 are coupled for rotation with the pistons 16 by pins 26. Oil is fed to actuate and cool the clutches through a fixed manifold 41. A pump 81 draws from a sump 80 and delivers oil to a manual distributer valve 85 at a pressure, say 100 p.s.i., regulated by a valve 84 the outlet oil from which is regulated, by a further valve 91, to a lower pressure, say 20 p.s.i., and is continually supplied to the disengaging chambers 66 through pipes 50 and passages 43, 64, and to the inner edges of the friction plates through the passages 70 and arcuate slots 73. Rightward (or leftward) shift of the distributer valve 85, from the midway position, in which both clutches are disengaged, supplies 100 p.s.i. pressure oil to the engaging chamber 57 of the clutch 28 (or 29) through a pipe 49 (or 51) and passages 52, 54, 55, 56, the engaging chamber of the disengaged clutch 29 (or 28) exhausting through a pipe 90 (or 89). |
