Hydraulic hybrid accumulator shut-off valve

An accumulator for a hydraulic vehicular drivetrain comprising:

• a tank;
• a bladder mounted within said tank and containing a fluid, said tank defining a fluid space surrounding said bladder;
• and
• a shut-off valve in communication with said fluid space and comprising:
• a valve body having a cylindrical hollow and a valve seat surrounding one end of said cylindrical hollow;
• a main piston including a piston head having a central opening and slidably at mounted within said cylindrical hollow;
• a poppet valve including a valve head, mating with said valve seat in a closed position, and a valve stem extending from said valve head into said central opening to guide said valve member in axial movement relative to said main piston;
• a spring mounted between said valve and said main piston for urging said valve toward an open position;
• and
• piston operating means for moving said main piston relative to said valve body between open and closed positions.

A hydraulic hybrid accumulator shut-off valve comprising:

• a valve body having a cylindrical hollow and a valve seat surrounding one end of said cylindrical hollow;
• a poppet valve including a valve head, mating with said valve seat in a closed position, a valve stem extending from said valve head and a guide member having a central opening receiving said valve stem to guide movement of said poppet valve;
• a first spring mounted between said poppet valve and said guide member for urging said poppet valve toward an open position;
• a ball valve rotatably mounted between open and closed positions and in fluid communication with said cylindrical hollow;
• a second spring biasing said ball valve toward rotation in one direction;
• a fluid actuator for rotating said valve in a second direction, opposite said one direction;
• and
• a control valve in communication with said fluid actuator for selectively supplying a high pressure fluid to said fluid actuator.

An accumulator for a hydraulic vehicular drivetrain comprising:

• a tank;
• a bladder mounted within said tank and containing a fluid, said tank defining a fluid space surrounding said bladder;
• a shut-off valve in communication with said fluid space and comprising:
• a poppet valve including a valve head, mating with said valve seat in a closed position, a valve stem extending from said valve head and a guide member having a central opening-receiving said valve stem to guide movement of said poppet valve;
• a first spring mounted between said poppet valve and said guide member for urging said poppet valve toward an open position;
• a ball valve rotatably mounted between open and closed positions and in fluid communication with said cylindrical hollow;
• a second spring biasing said ball valve toward rotation in one direction;
• a fluid actuator for rotating said valve in a second direction, opposite said one direction;
• and
• a control valve in communication with said fluid actuator for selectively supplying a high pressure fluid to said fluid actuator.