Provided is a work machine capable of effectively discharging air from a hydraulic circuit of a winch unit capable of applying braking to a winch drum by receiving a working oil. The work machine includes: a winch unit having a winch drum, a winch motor, a cylinder portion and a clutch portion; a hydraulic sources; a braking operating unit; a brake valve; a connecting portion; and a throttle portion. The throttle portion includes an opening having an opening diameter that is set so as to hold a pressure in a positive oil chamber for generating a brake force applied to the winch drum and to discharge a working oil from the positive oil chamber.

The present invention is directed to a self-locking non-backdrivable gear system. The gear system may comprise a primary motor input and self-lubricating gear box. The primary motor input is for rotation of the gearbox about the axis of a drive shaft. The gearbox may comprise an input ring gear, one or more planet locking gears, fixed spur gear, and output spur gear. In operation, rotation of the primary motor input causes rotation of the ring gear which causes rotation of the planet locking gear which causes rotation of the output spur gear which causes rotation of the drive shaft. However, in the absence of rotation of the ring gear, a rotational force applied to the output spur gear causes the gear teeth on the fixed and output spur gears to lock the planet gear in place.

The present invention is directed to a self-locking non-backdrivable gear system. The gear system may comprise a primary motor input and self-lubricating gear box. The primary motor input is for rotation of the gearbox about the axis of a drive shaft. The gearbox may comprise an input ring gear, one or more planet locking gears, fixed spur gear, and output spur gear. In operation, rotation of the primary motor input causes rotation of the ring gear which causes rotation of the planet locking gear which causes rotation of the output spur gear which causes rotation of the drive shaft. However, in the absence of rotation of the ring gear, a rotational force applied to the output spur gear causes the gear teeth on the fixed and output spur gears to lock the planet gear in place.

A brake or a clutch includes a central shaft, an output-side threaded driver, an output brake plate, an input brake plate, and an input-side threaded driver. The output-side threaded driver and the input-side threaded driver are rotationally locked to the central shaft, such as by splines. The output-side threaded driver is threaded to the output brake plate and the input-side threaded driver is threaded to the input brake plate. The output brake plate is threaded to the input brake plate in a direction opposite the threaded engagement of the drivers to the brake plates. The brake or clutch may include two stator plates and three friction discs located between the output brake plate and the input brake plate.

A brake or a clutch includes a central shaft, an output-side threaded driver, an output brake plate, an input brake plate, and an input-side threaded driver. The output-side threaded driver and the input-side threaded driver are rotationally locked to the central shaft, such as by splines. The output-side threaded driver is threaded to the output brake plate and the input-side threaded driver is threaded to the input brake plate. The output brake plate is threaded to the input brake plate in a direction opposite the threaded engagement of the drivers to the brake plates. The brake or clutch may include two stator plates and three friction discs located between the output brake plate and the input brake plate.

An easily changeable assembly type power winch includes a power source, a deceleration device, an outer casing, a rope wheel, a first support frame and a second support frame. After the power winch and two cross plates are assembled to form a basic assembly, a rope outlet board and an electric control box are assembled with the basic assembly to form the power winch in a horizontal assembly mode or an upright assembly mode, and these two assembly modes can be switched quickly to achieve the effects of reducing the manufacturing cost, improving the convenience of assembling, and broadening the scope of application.

An easily changeable assembly type power winch includes a power source, a deceleration device, an outer casing, a rope wheel, a first support frame and a second support frame. After the power winch and two cross plates are assembled to form a basic assembly, a rope outlet board and an electric control box are assembled with the basic assembly to form the power winch in a horizontal assembly mode or an upright assembly mode, and these two assembly modes can be switched quickly to achieve the effects of reducing the manufacturing cost, improving the convenience of assembling, and broadening the scope of application.

This invention relates to a cable drive unit (1) for use with a free stall cleaning system (101). The cable drive unit (1) includes a base frame (3), a support frame (5) being displaceable with respect to the base frame (3) via a corresponding displacement assembly (7), and a drum (9) pivotably mountable about the support frame (5) and displaceable therewith for receiving a cable (11) to be wound about said drum (9). Also described is a kit for assembling a cable drive unit (1) and a free stall cleaning system (101). The invention further includes a method of winding a cable (11) of a free stall cleaning system (101) about a drum (9) via the present cable drive unit (1).

A trolley of a rope crane, comprising a trolley body, a transverse load beam of the trolley, a hoisting mechanism and comprises a rope drum, a hoisting motor for driving the rope drum, and a gear for coupling the hoisting motor to the rope drum, whereby the gear has a primary side and a secondary side, and whereby the rope drum is located, in the vertical direction of the trolley, between the hoisting motor and load beam parallel to the load beam. The hoisting mechanism is supported by a three-point support to a main beam, whereby the first support point and second support point are adjacent to the secondary side of a gear, and whereby the third support point is formed by a support of the rope from end facing away from the gear to the load beam at a lateral distance from the first and second support point.

A trolley of a rope crane, comprising a trolley body, a transverse load beam of the trolley, a hoisting mechanism and comprises a rope drum, a hoisting motor for driving the rope drum, and a gear for coupling the hoisting motor to the rope drum, whereby the gear has a primary side and a secondary side, and whereby the rope drum is located, in the vertical direction of the trolley, between the hoisting motor and load beam parallel to the load beam. The hoisting mechanism is supported by a three-point support to a main beam, whereby the first support point and second support point are adjacent to the secondary side of a gear, and whereby the third support point is formed by a support of the rope from end facing away from the gear to the load beam at a lateral distance from the first and second support point.