| 摘要 |
<p>1317647 Controlling variable speed gears; fluid pressure brakes CATERPILLAR TRACTOR CO 6 July 1970 [16 July 1969] 32676/70 Headings F2D and F2E A vehicle has a transmission 61, an air controlled (e.g. spring applied, air released) parking brake 34 and an air actuated valve 56 so connected to a source 20 of air pressure that when the brake 34 is applied, the valve 56 places the transmission 61 into neutral. As shown when a manual valve 26 vents lines 28, 30 to apply the brake 34 the spools 44, 50 of another valve 42 are raised to pressurize the valve 56 via lines 24, 54 to interrupt fluid flow from a pump 58 to the transmission control 60. When the manual valve 26 pressurizes the lines 28, 30 the spools 44, 50 are lowered and the valve 56 vented via lines 54, 62, 64.</p> |
