US Patent 7866875 Concrete agitating drum driving device
Patent 7866875 was granted and assigned to Kayaba Industry on January, 2011 by the United States Patent and Trademark Office.
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A variable capacity hydraulic pump (10) drives a concrete agitating drum (1) via a hydraulic motor (81). A hydraulic actuator (14) regulates a discharge flow rate of the hydraulic pump (10) depending on an actuator driving pressure. A load sensing valve (40) generates the actuator driving pressure by reducing a discharge pressure of the hydraulic pump (10) according to a differential pressure between the discharge pressure and a load pressure acting on the hydraulic motor (81). A shut-off valve (20) shuts off supply of the pressurized oil discharged from the hydraulic pump (10) to the hydraulic motor (81). Due to this action, when the differential pressure increases beyond a predetermined differential pressure, an unload valve (30) drains the discharged oil, thereby preventing the hydraulic pump (10) from generating noise due to an excessive increase in the discharge pressure.
US Patent 07866875 Concrete agitating drum driving device US Patent 7866875 Concrete agitating drum driving device
US Patent 07866875 Concrete agitating drum driving device
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