| 摘要 |
<p>1,123,772. Reversing gearing; disc brakes. CATERPILLAR TRACTOR CO. 11 Jan., 1966 [3 Feb., 1965], No. 1187/66. Headings F2D and F2E. In a bevel forward-neutral-reverse gear, for raising and lowering the cutting blade of an earthmoving machine wherein a pair of continuously and oppositely-driven bevel wheels 12, 13, driving through spur gears 16, 17, are alternatively clutched to a driven shaft 11 by a pair of independently movable dogtoothed clutch members 22, 23 splined on the driven shaft 11 and arranged in a fixed cylinder 24 at each end of a stack of friction brake discs 28 splined alternately to the shaft 11 and cylinder 24, the clutch members 22, 23 are normally spring biased at 26, 27 out of engagement with the gears 16, 17 and compress the stack of brake discs to hold the driven shaft 11 stationary until fluid pressure, supplied from a pump 30 through ducts 32, is selectively directed by a manually operated valve 33 through ducts 39, 40 to one or other of the two piston-like clutch members 22, 23 releasing the brake stack 28 and connecting the driven shaft with either gear 16 or 17 for rotation in one or other direction, the application of the brake when passing through neutral facilitating clutch engagement.</p> |
