| 摘要 |
PROBLEM TO BE SOLVED: To enable the high speed rotation of a mixer drum without substantially increasing the number of revolutions of an engine. SOLUTION: A concrete mixer truck has a main pump 7 driven in response to a power supply from an engine 16 for traveling the truck, and a hydraulic motor 12 receiving hydraulic pressure supplied from the main pump 7 to drive a mixer drum 4. When raw concrete is charged and kneaded in the mixer drum 4, hydraulic pressure is further supplied to the hydraulic motor 12 from a sub- pump 10 driven in response to the power supply from the engine 16. COPYRIGHT: (C)2003,JPO
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