| 摘要 |
The mixer drum driving device S includes a hydraulic motor 3, hydraulic pump 4, auxiliary hydraulic pump 5, and a direct current brush motor 6. The hydraulic motor 3 drives and rotates the mixer drum M. The hydraulic pump 4 supplies pressure oil to the hydraulic motor 3 via switching valve 20 and main hydraulic line 8 by being driven by the power of an engine E of the mixer truck. The auxiliary hydraulic pump 5 rotates the mixer drum M by supplying pressure oil to the hydraulic motor 3 independently of the hydraulic pump 4. The direct current brush motor 6 drives and rotates the auxiliary hydraulic pump 5. The mixer drum M is driven and rotated by driving only the auxiliary hydraulic pump 5 by the direct current brush motor 6 in the case of rotating the mixer drum M for mixing, and whilst the hydraulic pump 5 is supplying pressure oil to the hydraulic motor 3, the switching valve 20 is set to position 20c so that the hydraulic pump 4 is disconnected from the hydraulic motor 3. |
