A drive system for an aircraft landing gear, the drive system including a pinion gear, a drive shaft arranged to rotate the pinion gear about a drive axis, a driven gear arranged to mesh with the pinion gear to be rotatable by the pinion gear, the driven gear being connectable to a wheel of the landing gear to be capable of rotating the wheel about a wheel axis; and a flexible interface. The flexible interface includes a plurality of driven gear coupling members, each driven gear coupling member having a first connection portion attached to the driven gear, a second connection portion adapted to be attached to the wheel at an offset distance from the wheel axis, and a joint between the first connection portion and the second connection portion, the joint permitting relative movement between the first connection portion and the second connection portion.

Driving arrangement for a heavy-duty grinding mill (50) having a horizontal tube with a circumferential girth gear (51), comprising a driving assembly, comprising a motor (10); at least two engaging pinions (42, 44) configured to engage the girth gear (51) for driving the grinding mill (50); at least one gearbox (20) comprising an input shaft (22) for coupling the motor (10) with the at least one gearbox (20), at least two output shafts (31, 32) for coupling the gearbox (20) with the at least two engaging pinions (42, 44) and a torque split arrangement being configured to transmit torque of the input shaft (22) to the at least two output shafts (31, 32); and at least one frame (48) for supporting the at least two engaging pinions (42, 44) separate from the gearbox (20), and a heavy-duty grinding mill.

A flexible gear coupling includes two external gears and two internal gears meshing with the respective two external gears. A tooth root crowning radius of each external gear is smaller than a tooth tip crowning radius of the external gear. The external gear is formed such that a reference tooth height that is a tooth height at a tooth width direction middle position is smaller than an end tooth height that is a tooth height at a tooth width direction end position. A ratio of the end tooth height to the reference tooth height is set to 1.21 or more, and/or a ratio Rc/Rb of the tooth root crowning radius to the tooth tip crowning radius is set to 0.37 or less.

A flexible gear coupling includes two external gears and two internal gears meshing with the respective two external gears. A tooth root crowning radius of each external gear is smaller than a tooth tip crowning radius of the external gear. The external gear is formed such that a reference tooth height that is a tooth height at a tooth width direction middle position is smaller than an end tooth height that is a tooth height at a tooth width direction end position. A ratio of the end tooth height to the reference tooth height is set to 1.21 or more, and/or a ratio Rc/Rb of the tooth root crowning radius to the tooth tip crowning radius is set to 0.37 or less.

A method for generating a tooth space profile between two teeth of a wheel engaging with a roller pinion in a reference plane perpendicular to a central axis (X1) whose intersection with the reference plane defines a centre (C). The method comprises defining a nominal tooth space with symmetrical first and second profiles so that the space is suitable for receiving a roller which comes into contact, without clearance, with the facing active portions of the first and second profiles at the level of a primitive diameter. The method further comprises the steps of deforming the bottom portion of the first profile so that the bottom point is brought nearer to the centre by an amount equal to a given radial clearance, and moving the first profile angularly through a given angular half-clearance around the centre to shift it away from the radial axis.

A method for generating a tooth space profile between two teeth of a wheel engaging with a roller pinion in a reference plane perpendicular to a central axis (X1) whose intersection with the reference plane defines a centre (C). The method comprises defining a nominal tooth space with symmetrical first and second profiles so that the space is suitable for receiving a roller which comes into contact, without clearance, with the facing active portions of the first and second profiles at the level of a primitive diameter. The method further comprises the steps of deforming the bottom portion of the first profile so that the bottom point is brought nearer to the centre by an amount equal to a given radial clearance, and moving the first profile angularly through a given angular half-clearance around the centre to shift it away from the radial axis.

Driving arrangement for a heavy-duty grinding mill (50) having a horizontal tube with a circumferential girth gear (51), comprising a driving assembly, comprising a motor (10); at least two engaging pinions (42, 44) configured to engage the girth gear (51) for driving the grinding mill (50); at least one gearbox (20) comprising an input shaft (22) for coupling the motor (10) with the at least one gearbox (20), at least two output shafts (31, 32) for coupling the gearbox (20) with the at least two engaging pinions (42, 44) and a torque split arrangement being configured to transmit torque of the input shaft (22) to the at least two output shafts (31, 32); and at least one frame (48) for supporting the at least two engaging pinions (42, 44) separate from the gearbox (20), and a heavy-duty grinding mill.

PTO systems having reduced gear rattle are disclosed. Embodiments include a PTO having an input gear and an intermediate gear engaging the input gear. The intermediate gear rotates about fixed rotational axis. The input gear is attached to the intermediate gear by a support whereby the rotational axis of the input gear is capable of pivoting about the rotational axis of the intermediate gear at a fixed distance, following an arcuate path. The input gear is configured to engage a transmission gear, and biased to pivot toward the transmission gear, thereby reducing or eliminating gear rattle from overly loose engagement between meshing teeth on the intermediate and transmission gears.

PTO systems having reduced gear rattle are disclosed. Embodiments include a PTO having an input gear and an intermediate gear engaging the input gear. The intermediate gear rotates about fixed rotational axis. The input gear is attached to the intermediate gear by a support whereby the rotational axis of the input gear is capable of pivoting about the rotational axis of the intermediate gear at a fixed distance, following an arcuate path. The input gear is configured to engage a transmission gear, and biased to pivot toward the transmission gear, thereby reducing or eliminating gear rattle from overly loose engagement between meshing teeth on the intermediate and transmission gears.

The invention relates to a bevel gear box for use as part of the steering mechanism of a commercial vehicle. The invention may be suited to use where the controlled axles of the vehicle are located below the passenger compartment. The bevel gear box may comprise box housing, which in turn houses two separate bevel gear barrel assemblies. The exemplified bevel gear barrel assemblies each comprise a bevel gear, the bevel gear further comprising a gear head incorporating teeth and a gear shaft. Shaft housing surrounds a circumference of gear shaft. To enable the bevel gear to rotate within the shaft housing, bearings may be placed between surfaces of the bevel gear and the shaft housing. The face of the gear head may comprise a gear head recess for location of a center dowel therein.