A drawworks gearbox includes additional braking on the input side of the gearbox to provide a redundant emergency brake and, optionally, a separate parking brake with the drum-side brakes being the emergency brake. An air-cooled brake disc is attached to a high speed coupling connected to the gearbox input pinion. A hydraulic-apply, spring-release brake is mounted to the gearbox housing at each pinion location and arranged to act on its respective disc.

Winches with axially aligned, mechanically actuated brakes, and associated systems and methods are disclosed. A representative winch includes a cable drum rotatable in a winding direction and an unwinding direction, a drive motor, a drive shaft coupled to the drive motor and rotatable about a shaft axis, a gear train coupled to the drive shaft and the cable drum, and a mechanically actuated brake. The brake can include a first element coupled to the drive shaft and rotatable about the shaft axis, a second element coupled to the cable drum and rotatable about the shaft axis, and a friction element positioned between the first and second elements and rotatable about the shaft axis. At least one of the first and second elements can be movable toward and away from the other between an engaged position with the friction element clamped between the first and second elements, and a disengaged position with the friction element unclamped.

A chain hoist with a chain wheel and a load chain looped around the chain wheel has a shaft rotatably mounted in the housing for driving the chain wheel. A threaded disc with internal thread is connected to an external thread of the shaft and has a drive gear tooth system engaged by a force element actuated manually or motorized. A brake disc rotatable relative to shaft and threaded disc has a braking surface facing a drive surface of the shaft and a braking surface facing the threaded disc. The brake disc has locking teeth engaging a safety catch of the housing. A freewheel device is provided to increase an axial distance between threaded disc and drive surface. Centrifugal elements with outward friction surface are fixed to the threaded disc and expand outwardly against a spring force to contact a braking surface of the housing with their friction surface.

A chain hoist with a chain wheel and a load chain looped around the chain wheel has a shaft rotatably mounted in the housing for driving the chain wheel. A threaded disc with internal thread is connected to an external thread of the shaft and has a drive gear tooth system engaged by a force element actuated manually or motorized. A brake disc rotatable relative to shaft and threaded disc has a braking surface facing a drive surface of the shaft and a braking surface facing the threaded disc. The brake disc has locking teeth engaging a safety catch of the housing. A freewheel device is provided to increase an axial distance between threaded disc and drive surface. Centrifugal elements with outward friction surface are fixed to the threaded disc and expand outwardly against a spring force to contact a braking surface of the housing with their friction surface.

In a brake device configured to perform braking and releasing of a disc by moving a rod having a lining at a leading end of the rod by a spring device, a cylinder tube of a pressure control unit is arranged adjacent to a pressure storage unit configured to store a compressed fluid. When the disc is to be released, a pressure-receiving piston is moved to a releasing position. When the disc is to be braked, the pressure-receiving piston is returned to braking position.

A winch is provided that includes a frame and a winch drum mounted for rotation relative to the frame; a gearing via which the winch drum can be rotated by a drive motor attached to the winch, wherein the gearing includes a gear shaft; a first brake that includes a first brake body and a second brake body which is non-rotationally connected to the gear shaft. The first and second brake bodies can be pressed against each other in order to achieve a braking effect based on frictional engagement. A second brake is also provided that includes a third brake body and a fourth brake body which is non-rotationally connected to the gear shaft and/or the second brake body. The third and fourth brake bodies can be pressed against each other in order to achieve a braking effect based on frictional engagement.

A winch is provided that includes a frame and a winch drum mounted for rotation relative to the frame; a gearing via which the winch drum can be rotated by a drive motor attached to the winch, wherein the gearing includes a gear shaft; a first brake that includes a first brake body and a second brake body which is non-rotationally connected to the gear shaft. The first and second brake bodies can be pressed against each other in order to achieve a braking effect based on frictional engagement. A second brake is also provided that includes a third brake body and a fourth brake body which is non-rotationally connected to the gear shaft and/or the second brake body. The third and fourth brake bodies can be pressed against each other in order to achieve a braking effect based on frictional engagement.

This disclosure relates to an electromagnetic brake configured to slow a deceleration rate of a passenger conveyer, such as an elevator car, during braking. In particular, this disclosure relates to a passenger conveyer system including the electromagnetic brake and a corresponding method. An example system includes a controller and an electromagnetic brake. The electromagnetic brake includes a disc configured to interface with a drive shaft, a spring, and a plate biased in a first direction into engagement with the disc by a bias force of the spring. The electromagnetic brake further includes an electromagnet selectively activated in response to a command from the controller to produce a magnetic field attracting the plate in a second direction opposite the first direction to partially offset the bias force of the spring. Further, when the electromagnet is activated, the plate engages the disc.

This disclosure relates to an electromagnetic brake configured to slow a deceleration rate of a passenger conveyer, such as an elevator car, during braking. In particular, this disclosure relates to a passenger conveyer system including the electromagnetic brake and a corresponding method. An example system includes a controller and an electromagnetic brake. The electromagnetic brake includes a disc configured to interface with a drive shaft, a spring, and a plate biased in a first direction into engagement with the disc by a bias force of the spring. The electromagnetic brake further includes an electromagnet selectively activated in response to a command from the controller to produce a magnetic field attracting the plate in a second direction opposite the first direction to partially offset the bias force of the spring. Further, when the electromagnet is activated, the plate engages the disc.

A system includes a first transmission having a first planetary gearset, a first drive shaft, and a first annular sleeve. The first annular sleeve is positioned circumferentially about the first drive shaft, and the first annular sleeve is configured to move axially relative to the first drive shaft and the first planetary gearset from a first axial position in which the first annular sleeve engages a first sun gear of the first planetary gearset to a second axial position in which the first annular sleeve engages a first ring gear of the first planetary gearset to adjust a gear ratio of the first transmission.