초록 ▼

A winch (10) is powdered by a motor (20) mounted at one end of a drum (12) through a three-stage planetary drive train (26) disposed adjacent the opposite end of the drum (12 ). The drive train (26) includes elongate drive shaft (25) which extends longitudinally through the interior of the drum (12)

A winch (10) is powdered by a motor (20) mounted at one end of a drum (12) through a three-stage planetary drive train (26) disposed adjacent the opposite end of the drum (12 ). The drive train (26) includes elongate drive shaft (25) which extends longitudinally through the interior of the drum (12) toward the motor (20). A brake-clutch assembly (24), disposed within the interior of the drum (12) operably interconnects motor (20) and drive shaft (25). The brake-clutch assembly (24) automatically operates in response to the magnitude and direction of the torque being transmitted between motor (20) and drive shaft (25). In operation, the brake-clutch assembly (24) permits the drive shaft (25) to rotate relative to and power the drum (12) to reel in the loaded drum cable and then frictionally locks the drive shaft (25) to the inside diameter of the drum (12) to hold the load on the drum cable when motor (20 ) is stopped. The brake-clutch assembly (24) also frictionally bears against the inside diameter of the drum (12) when motor (20) is operating in the reverse direction to reel out the load attached to the drum cable thereby controlling the rotational speed of the drum (12) to prevent it from overrunning the motor (20).

대표청구항 ▼

A winch comprising: (a) a hollow cable winding drum rotatable about a longitudinal axis; (b) reversible motor means disposed longitudinally of a first end of said drum; (c) power transmission means operably connected to said drum and disposed longitudinally of an opposite second end of said drum, sa

A winch comprising: (a) a hollow cable winding drum rotatable about a longitudinal axis; (b) reversible motor means disposed longitudinally of a first end of said drum; (c) power transmission means operably connected to said drum and disposed longitudinally of an opposite second end of said drum, said power transmission means including drive shaft means extending longitudinally through the interior of said drum toward said first end of said drum; (d) brake-clutch means disposed within said drum and operably interconnecting said motor means with said drive shaft means, said brake-clutch means including: (1) brake means automatically frictionally engageable directly against and disengageable from the inside diameter of said drum in response to the magnitude and direction of the torque load transmitted between said motor means and said drive shaft means; and (2) overrunning clutch means disposed between said drive shaft means and said brake means permitting relative rotation between said drive shaft means and said brake means in a first direction and preventing relative rotation between said drive shaft means and said brake means in the opposite direction; (e) wherein said brake means comprises: (1) at least one friction ring assembly, said friction ring assembly including a frustoconically-shaped mandrel coupled to said overrunning clutch means, a correspondingly shaped frustoconical expandable friction ring antirotationally coupled to said mandrel, and means for antirotationally coupling said friction ring to said mandrel to prohibit relative rotation while allowing relative longitudinal movement between said friction ring and said mandrel; and (2) actuator means responsive to the magnitude and direction of the torque acting on said drive shaft means for expanding said friction ring against the inside diameter of said drum and for contracting said friction ring away from the inside diameter of said drum depending on the magnitude and direction of the torque load transmitted between said motor means and said drive shaft means; and (f) wherein said actuator means includes a cam member antirotationally coupled with said motor means, said cam member having an axially facing cam surface, and a cam follower antirotationally coupled with and axially slidable along said drive shaft means, said cam follower coacting with said cam member to: (1) slide axially toward said friction ring assembly when the torque load is being transmitted between said motor means and said drive shaft in a first direction to thereby urge said friction ring and said mandrel towards each other to expand said friction ring against the inside diameter of said drum means; and (2) slide axially away from said friction ring assembly to allow said friction ring and said mandrel to shift longitudinally away from each other thereby to enable said friction ring to contract away from the internal diameter of said drum.