Abstract: In accordance with an example embodiment, a friction disk may include friction material positioned on a first side of the disk. The friction material may include a first plurality of grooves extending from an inner diameter of the friction material to an outer diameter of the friction material, and a second plurality of grooves extending in a radial direction from the inner diameter and ending prior to the outer diameter. The second plurality of grooves may have a substantially uniform width. The second plurality of grooves may be both deeper and wider than the first plurality of grooves. The first and second plurality of grooves may be interconnected so that fluid can flow from the second plurality of grooves into the first plurality of grooves.

Abstract: A hydraulic actuating pin system is disclosed with an actuating pin, clutch drum, spring and hydraulics. The clutch drum has a scalloped annulus with raised and lowered sections. The spring pushes the pin towards the scalloped annulus. When the pin extends into the lowered section, it prevents the clutch drum from rotating. The hydraulics can compress the spring and extract the pin to allow the clutch drum to rotate. The proximal end of the pin can include a head, and hydraulic pressure can move the head to compress the spring. When the pin is fully extended into the lowered section, the end of the pin can not touch the bottom of the lowered section. The hydraulics can include a one-way valve allowing flow from a pump source to the pin, and a pressure release orifice allowing controlled release of hydraulic pressure from the pin.

Abstract: A hydraulic actuating pin system is disclosed with an actuating pin, clutch drum, spring and hydraulics. The clutch drum has a scalloped annulus with raised and lowered sections. The spring pushes the pin towards the scalloped annulus. When the pin extends into the lowered section, it prevents the clutch drum from rotating. The hydraulics can compress the spring and extract the pin to allow the clutch drum to rotate. The proximal end of the pin can include a head, and hydraulic pressure can move the head to compress the spring. When the pin is fully extended into the lowered section, the end of the pin can not touch the bottom of the lowered section. The hydraulics can include a one-way valve allowing flow from a pump source to the pin, and a pressure release orifice allowing controlled release of hydraulic pressure from the pin.

Abstract: A differential locking device (10) includes a differential (12) having a differential housing (13) coaxial with a pair of axle shafts (30,32). The differential housing (13) includes a pair of side gears (26, 28) splined to the pair of axle shafts (30, 32) and a plurality of pinion gears (22) which engage the side gears (26,28). A locking collar (44) splined to one of the axle shafts (30) is sildable between an unlocked position and a locked position. A hydraulic piston (54) applies pressure to the locking collar (44) to actuate the locking collar (44) to the locked position, wherein teeth (46) on the locking collar (44) engage corresponding teeth (50) on the differential housing (14) thereby fixing the differential housing (14) for rotation with the locking collar (44) and thus the side gears (26,28). The resulting differential locking device is compact and can be engaged or disengaged quickly.

Abstract: A washer includes at least one tooth interlocked with a spline of a shaft in order to retain the washer from rotating relative to the shaft. A snap ring is positioned in a groove of the shaft. The washer includes a stop nested in a gap of the snap ring in order to retain the snap ring from rotating relative to the shaft. Preferably, the washer includes at least one catch that flanks the stop and overlaps the snap ring in order to retain the snap ring in the groove.