Power take off gear with a hydraulic impact damper

A power take off gear, comprising:

• a flange forming an input for the device and including a radially outwardly extending protrusion;
• a ring gear at least partially rotatable with respect to the flange and including:
• first and second oppositely facing radial sides;
• and,
• first and second circumferentially disposed and circumferentially aligned slots;
• a curved piston circumferentially displaceable with respect to the ring gear and including:
• first and second radially inwardly extending protrusions at least partially circumferentially aligned with the radially outwardly extending protrusion;
• and,
• first and second circumferential ends disposed in the first and second slots, respectively;
• at least one elastic element engaged with the flange and the first and second cover plates;
• and,
• first and second cover plates:
• fixedly secured to the first and second radial sides, respectively;
• and,
• sealing the first and second slots in first and second axial directions, respectively, wherein:
• the first slot is bounded radially inwardly and outwardly and at a first circumferential end by material forming the ring gear;
• and,
• the second slot is bounded radially inwardly and outwardly and at a second circumferential end by material forming the ring gear.

A power take off gear, comprising:

• a flange forming an input for the device and including a radially outwardly extending protrusion forming a portion of a radially outer circumference of the flange;
• a ring gear including:
• first and second oppositely facing radial sides;
• and,
• first and second slots:
• bounded radially inwardly and outwardly by material forming the ring gear;
• and,
• including first and second openings, respectively, facing each other in a circumferential direction;
• a curved piston disposed in the first and second openings, respectively and with first and second radially inwardly extending protrusions;
• first and second cover plates:
• fixedly secured to the first and second radial sides;
• sealed to the ring gear at respective radially outer circumferences of the first and second cover plates;
• and,
• in contact with the curved piston;
• and,
• at least one elastic element engaged with the flange and the first and second cover plates, wherein:
• the first and second cover plates seal the first and second slots in first and second axial directions, respectively;
• for first torque applied to the flange in a rotational direction at a first magnitude, the flange is arranged to rotate with respect to the ring gear in the rotational direction such that:
• the radially outwardly extending protrusion contacts the first radially inwardly extending protrusion;
• the flange displaces the curved piston in the rotational direction;
• the first end of the curved piston displaces in the rotational direction in the first slot;
• and,
• the first end displaces fluid disposed in the first slot, by forcing the fluid between the curved piston and the ring gear, to dampen motion of the flange in the rotational direction;
• and,
• for second torque applied to the flange in the rotational direction and at a second magnitude, greater than the first magnitude, the flange is arranged to rotate with respect to the ring gear in the rotational direction such that:
• the radially outwardly extending protrusion contacts the ring gear;
• and,
• the flange displaces the ring gear in the rotational direction.