A power tool includes a motor and a gear speed reducer. The motor has a motor shaft that is rotatable in a normal direction and in a reverse direction. The gear speed reducer is operably coupled to the motor shaft. The gear speed reducer is configured such that a reduction ratio of the gear speed reducer is changed in response to a change of a rotation direction of the motor shaft.

The present invention relates to a freewheel (2) having a first race (16), a second race (18), a clamping gap (20) formed between the first and second race (16, 18), at least one clamping element (30) in the clamping gap (20) and a pre-tensioning device (32) for pre-tensioning the clamping element (30) in a clamping position inside the clamping gap (20), wherein the pre-tensioning device (32) has a spring element (34) supported indirectly or directly on the first race (16). The pre-tensioning device (32) further has a spring support frame (36) that can be moved in relation to the first race (16), in which spring support frame the spring element (34) is arranged.

The invention relates to a refinement of a spindle drive (1), and to a louvered window or a louvered shutter having a spindle drive for moving louver elements such that applied return forces and return torques can be absorbed better, and in particular without placing a load on the drive motor. For this purpose, the spindle drive (1) has a specially designed return stop mechanism (6) arranged between a drive shaft of a drive motor (3) and a threaded spindle (4).

Provided is a turbo fan engine (TF) provided with a power transmission device that switches main shafts (MSs) connected to a starter generator (SG) so as to perform power transmission, between at startup and after the startup. The TF includes a first MS and a second MS. The power transmission device includes a first shaft, an intermediate shaft, and a second shaft that are coaxially disposed, and a clutch. The first shaft is connected to the first MS through bevel gears, the intermediate shaft is disposed outside of the first shaft and is connected to the SG through bevel gears, and the second shaft is disposed outside of the intermediate shaft and is connected to the second MS through bevel gears. When, out of any two adjacent shafts of the first shaft, the intermediate shaft, and the second shaft, an inner shaft tries to rotate at a speed higher than a speed of an outer shaft, the clutch causes the both shafts to engage with each other and to rotate at the same speed, and transmits power, whereas when the outer shaft tries to rotate at a speed higher than a speed of the inner shaft, the clutch causes the both shafts to disengage from each other, and does not transmit power.

Provided is a clutch unit in which an output-side outer ring member is attached to a base plate without welding. A clutch unit (100) includes an output-side clutch (60) and a housing (11) that accommodates the output-side clutch (60). The output-side clutch (60) includes an output-side outer ring member (62). The output-side outer ring member (62) and the housing (11) have an engagement protrusion (62s) and an engagement groove (11s) that engage with each other to restrict relative rotation therebetween.

A lubricated rotational connection system provided with a free-wheel having a driving part and a driven part as well as at least one rotational link member arranged in a linking space, the linking space being located radially between a driving linking section and a driven linking section. A lubrication device comprises a fluid circulation device constrained to rotate with a driven pumping section of the driven part. The fluid circulation device is set in rotation with respect to a driving pumping section when the driving speed of rotation of the driving pumping section is lower than the driven speed of rotation of the driven pumping section about the axis of rotation in order to generate a forced circulation of the lubricating fluid within the linking space.

A hand-propelled, self-driving, traveling machine that includes a clutch which enables transmission between a wheel and a transmission shaft. The clutch provides a drive state in which the transmission shaft drives the wheel to rotate and an unlocked state in which the wheel is rotatable relative to the transmission shaft. The clutch includes a driving member, combined with the transmission shaft, a movable pin, movable between a locked position in which the clutch is in the drive state and an unlocked position in which the clutch is in the unlocked state, a transmission member connected to the wheel, a movable friction member provided with a limiting slot, where the movable pin is partially disposed in the limiting slot, and a fixed friction member that is fixed to the chassis and that is in a frictional contact with the movable friction member.

Methods and systems are provided for an isolator. In one example, system may include an isolator comprising a flexible laminated membrane comprising a non-linear torsional stiffness for compensation of axial, lateral, and angular displacements between a drive shaft and a clutch.

A lubricated rotational connection system provided with a free-wheel having a driving part and a driven part as well as at least one rotational link member arranged in a linking space, the linking space being located radially between a driving linking section and a driven linking section. A lubrication device comprises a fluid circulation device constrained to rotate with a driven pumping section of the driven part. The fluid circulation device is set in rotation with respect to a driving pumping section when the driving speed of rotation of the driving pumping section is lower than the driven speed of rotation of the driven pumping section about the axis of rotation in order to generate a forced circulation of the lubricating fluid within the linking space.

A one-way clutch is designed to minimize parasitic drag in the over-running condition. Rollers are positioned radially between an inner ring and outer ring and rotate with the inner ring. Positioning pins push the rollers up ramps on the inner ring into contact with the outer ring. In the locked mode, the outer ring also tends to push the rollers up the ramps into tighter contact. In the over-running condition, the outer ring tends to push the rollers down the ramp, against the force of the positioning pins, and away from contact. Each positioning pin includes a ball which is rotatably held in a retainer via microspheres. The ball is in rolling contact with the roller, as opposed to sliding contact, thereby limiting parasitic drag.