A friction clutch with a clutch plate having a hub member, a rim portion and a plurality of rib members. The hub member has a plurality of female hub teeth. The rim portion is disposed concentrically about the hub member and has a rim member and a friction material that is coupled to the rim member. Each of the rib members extend radially between the hub member and the rim member to couple the hub member and the rim member to one another. Each one of the rib members is intersected by at least three of the other rib members. Each of the other rib members intersecting the one of the rib members at a distinct location such that the distinct locations are spaced apart from one another along the one of the rib members.

To provide a rotating member that allows formation of protrusions to be dug into an opposite surface with a simple configuration, and that can prevent a direction-dependent reduction of anti-slip effect and provide sufficient slip prevention in the direction of torque as well as in the radial direction, and a method of forming this rotating member. The rotating member has a boss and an anti-slip surface on at least one of both axial end faces of the boss. The anti-slip surface includes a plurality of crater-like depressions each having a peripheral protrusion. At least some of the plurality of crater-like depressions are arranged serially to form a plurality of crater chains.

A universal joint or other vehicle driveline assembly includes an inner race, an outer race, and bearings positioned between the races. In some embodiments, the components of the universal joint that are in contact with the bearings are selectively processed to be harder than the other non-contact surfaces of the component.

Provided are a wet friction plate and a wet multiplate clutch device capable of reduction drag torque while suppressing a decrease in the area of a friction member. A wet multiplate clutch device 100 includes wet friction plates 110 at positions facing clutch plates 103 rotatably driven by rotary drive force of an engine. The wet friction plate 110 includes multiple friction members 112 through oil grooves 115 on a flat plate annular core metal 111. The friction member 112 has first fine grooves 113 opening at an inner peripheral edge 112a of the friction member 112 and extending to an outer peripheral edge side 112b and second fine grooves 114 opening at an outer peripheral edge 112b of the friction member 112 and extending to an inner peripheral edge side 112a. The first fine groove 113 and the second fine groove 114 are formed to have a groove width of equal to or greater than 0.1 mm and equal to or less than 0.8 mm, and overlap portions 113c, 114c overlapping with each other in a circumferential direction at the same position in a radial direction of the core metal.

A multi-plate clutch transmission includes an arrangement for selectively engaging the clutch by moving the sleeve to cause one or more friction disks on a sleeve connected to a shaft to move into contact with one or more friction disks on a clutch basket connected to a gear driven by another gear and another shaft driven by a prime mover. An arrangement for selectively disengaging the clutch is provided that uses prime mover torque to move the one or more friction disks on the sleeve out of contact with the one or more.friction disks on the clutch basket.

In a power transmission apparatus, a centrifugal clutch includes a holder, a press, and springs to urge masses from a radially outer position to a radially inner position. The masses are each housed in an associated one of housing portions arranged in a circumferential direction of the holder such that the masses are radially movable. More than one spring is provided in the circumferential direction between an inner peripheral wall surface of each of the housing portions and an associated one of the masses to urge the associated mass from the radially outer position to the radially inner position.

A method may produce an axially movable connection between two components with a plastic as a sliding material arranged therebetween. The method may involve providing the two components and either at least one of the two components has a plastic coating or a plastic sleeve is provided between the components, joining the two components to form a unit via a pressing force in an axial direction, clamping the unit in a device in which the two components are clampable and subjectable to a displacement force in the axial direction, pressing a sonotrode against an outer of the two components and bracing the outer component against a counter-holder, injecting an ultrasound signal into the sonotrode and moving the two components back and forth in the axial direction until a displacement force or a displacement velocity reaches a target, and ending the ultrasound signal and removing the unit from the device.

A tool for driving a component with a knurling pattern around an outer surface of the component is provided. A shaft, with a first end, is in the form of at least a partial cylinder, where the at least partial cylinder has a first inner diameter that is less than an outer diameter of the knurling pattern. Serrations in the shaft have a pattern that matches the knurling pattern, which allow the serration in the shaft to engage with the knurling pattern so that when the shaft is rotated, the component is rotated.

A toothed shaft can be installed in a hollow shaft that has an internal toothing such that the toothed shaft is coupled in a positively locking fashion so as to be telescopic in a direction of a longitudinal axis. The toothed shaft may include a toothing region with teeth on an outer circumference and extending in an axial direction. In the toothing region a shaft core may be overmolded by way of an injection molding process with a sliding coating comprised of thermoplastic material. The sliding coating may have at least three impressions, with each of the at least three impressions featuring an aperture that extends through the sliding coating to a surface of the shaft core.

An actuating device for a coupling/braking device is provided with at least one actuating piston that is axially slidable relative to a shaft and, in an actuating state, exerts an axially acting contact pressure on coupling/braking parts of the coupling/braking device. At least one control piston is provided that axially displaces the at least one actuating piston into the actuating position. A coating is provided in a contact region between the actuating piston and the control piston, wherein the coating is disposed at the actuating piston or at the control piston or at both the actuating piston and the control piston. The actuating piston can also be designed as a control piston that interacts immediately with the coupling/braking parts of the coupling/braking device.