A conveyor drive roller for a conveyor system. The conveyor drive roller has a hollow drum rotatably connected to a first stationary shaft and a second stationary shaft, and defines a sealed chamber. The chamber at least partially encloses means to rotate the hollow drum about the first and second stationary shafts. A pressure relief valve is positioned on the conveyor drive roller in fluid communication with the inside of the chamber. The pressure relief valve is configured to reduce a gas pressure increase inside of the chamber caused by a rise in a temperature of the conveyor drive roller during operation.

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.

A transmission mechanism includes: a drive shaft; and a stopper assembly, the stopper assembly including: a base, including a first thread; and a rotating component, positioned on the driving shaft, rotatable with the driving shaft, and including a second thread to engage the first thread, wherein at least one of the base and the rotating component is configured with a stopper; when the drive shaft rotates, the rotating component rotates with the drive shaft and slides relative to the base through an engagement of the first thread and the second thread; and when the stopper resists the base or the rotating component, a relative sliding between the base and the rotating component stops.

A drive device having a main drive device, a gearing, a switchable clutch, at least one hydraulic pump, and a gearing output shaft is started with low wear by providing an auxiliary drive to drive the gearing output shaft independently of the main drive device. A work machine device includes the drive device and a work machine which can be started accordingly in a low-wear manner and which enables longer-term operation in the reverse direction of rotation. Corresponding methods which are also provided in connection with the drive device and the work machine device, enable low-wear starting and the elimination of undesired operating states.

A casing includes an input-side casing part housing an input shaft and an output-side casing part housing an output shaft. In regard to a dimension in an axial direction of the output shaft, the dimension of the input-side casing part is smaller than the dimension of the output-side casing part. The output-side casing part includes an output-side bottom surface that serves as an installation surface when the casing is vertically installed; the output-side bottom surface includes mounting portions for vertical installation near four corners thereof; the input-side casing part includes an input-side back surface that serves as an installation surface when the casing is horizontally installed; the output-side casing part includes an output-side back surface that serves as an installation surface when the casing is horizontally installed; and mounting portions for horizontal installation are provided near four corners of the output-side back surface and on the input-side back surface.

A drive system for a conveyor system has an motor and a transmission. One or more clutches can be provided between the motor and transmission. The drive system can be mounted by way of a torque support. In order to reduce vibrations of the drive system, a damper is arranged on the axial motor-side end. If the motor, the transmission and, optionally, other components of the drive system are mounted on a rocker, the damper can be arranged on the motor-side axial end of the rocker.

A rotational coupling device may include a housing which may be coupled to a stationary coupler. The stationary coupler may be used to engage or couple the device to a machinery stand. A motivator shaft may be positioned on one side of the housing and a rotational drive shaft may be positioned on the other side of the housing. The motivator shaft and the rotational drive shaft may be operably connected together with a gear arrangement with rotation of the motivator shaft resulting in rotation of the rotational drive shaft that is of a reduced rate compared to the motivator shaft. The rotational drive shaft may be coupled or connected to the rotational assembly via a rotational coupler thereby allowing rotational motion provided by the motivator shaft to be transferred through the rotational drive shaft to the rotational assembly of the machinery stand to which the device is engaged.

A system includes a gear unit, the gear unit including at least one housing cover, a sensor unit, on which sensors are provided, being provided on the housing cover, the sensors being connected at least electrically to an evaluation unit.

A gearset includes a gearset housing, a drive shaft, and a radial fan fixed to the drive shaft. Disposed in surrounding relationship to the radial fan is an air-guiding cover which includes a gearset housing section to at least partially cover the gearset housing, a cylindrical section adjoining the gearset housing section and configured to receive an attachment for securement to the drive shaft, and a conical section adjoining the cylindrical section. The conical section of the air-guiding cover is disposed in surrounding relationship to the radial fan directly and without any dead space.

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.