| 摘要 |
<p>PURPOSE:To improve a manoeuvrability of speed-change-running, by locating a checking mechanism which prevents the occurrence of such a condition that supplies in series the fluids from one of pumps to both motors between a control valve and an operating tool for it. CONSTITUTION:A drum 13 having two cum grooves 11 and 12 is located being lined with an operating tool 10, and an operating part 14 of a control valve V1 and an operating part 15 of a control valve V2 are hooked at a No.1 cum groove 11 and a No.2 cum groove 12 respectively. Of the operating parts 14, 15 and the cum grooves 11, 12 is composed a checking mechanism 16 which prevents the occurrence of such a condition that supplies in series the fluids from one of pumps to both motors, i.e., the occurrence of a low torque condition at a middle speed running. And thus, a manoeuvrability of speed-change-running can be improved under such a condition that is free from any false operation.</p> |
