A carrier assembly includes a first portion having a cover flange. A second portion is coupled with the cover flange. A first trunnion is coupled with the first portion, and a second trunnion coupled with the first portion opposite the first trunnion. A first trunnion rib is coupled with the first portion, wherein the first trunnion rib projects outward from the first portion. A second trunnion rib is coupled with the first portion, wherein the second trunnion rib projects outward from the first portion. The first and second trunnion ribs are offset from a trunnion centerline.

A wind turbine gear box arrangement having one or more bearings located in a single region along the longitudinal axis and arranged to provide support between an input shaft and a non-rotating support component. The one or more bearings are arranged to at least partially restrict non-rotational movement between the input shaft and the non-rotating support component. A portion along the longitudinal axis between said input shaft and the non-rotating support component is bearingless outside the single region.

A differential case is comprised of: an outer peripheral wall cylindrical about a first axis; a first side wall being perpendicular to the first axis and having a flange; a second side wall having an outer side surface perpendicular to the first axis and being opposed to the first side wall; and an opening opened on the outer peripheral wall so as to allow side gears to be brought in the opening, the opening being so shaped that outlines of pinion gears do not touch a periphery of an oval as an outline of the opening in a case where an axis of the pinion gears is aligned with the center of the oval.

A case component of a transaxle includes: a bearing unit having a through-hole through with a shaft member is to be inserted; a matching surface unit having a matching surface on which another member is to be overlapped; bolt hole portions formed on the matching surface unit; bent wall portions, each having a V-shaped or U-shaped cross-section cut in a direction orthogonal to a straight line connecting a shaft center of the bearing unit and a shaft center of the bolt hole portions, each having a valley portion positioned on the straight line, and connecting the bearing unit and the respective bolt hole portions; and V-shaped portions, connected with the respective bent wall portions, provided on an outer circumference of the respective bolt hole portions, and protruding toward the bearing unit.

An object of the present invention is to decrease the size of a torque difference amplification mechanism to decrease the size and weight of a vehicle driving wheel apparatus which includes the torque difference amplification mechanism. The invention includes a gear unit 30, which is provided between electric motors (2L, 2R) each having an outer rotor (5) and left and right driving wheels and is constituted by two planetary gear mechanisms (3L, 3R) each having three elements and two degrees of freedom assembled coaxially with each other. The planetary gear mechanisms include: input outer gears (R.sub.L, R.sub.R) coupled to the outer rotors (5) of the electric motors (2L, 2R); output planetary carriers (C.sub.L, C.sub.R) coaxial with the outer gears (R.sub.L, R.sub.R); sun gears S.sub.L, S.sub.R which are coaxial with the outer gears (R.sub.L, R.sub.R); and planetary gears P.sub.L, P.sub.R serving as revolution gears. One planetary carrier (C.sub.L) of the two planetary gear mechanisms (3L, 3R) is joined to the sun gear (S.sub.R) in the other by a first joint member (31); the sun gear (S.sub.L) is joined to the planetary carrier (C.sub.R) in the other by a second joint member (32) and these joint members are disposed coaxially with each other. The planetary carriers (C.sub.L, C.sub.R) of the planetary gear mechanism (S.sub.L, S.sub.R) are coupled to output gear shafts (14L, 14R) of the driving wheels.

A power transmission unit in which a size, a weight, a manufacturing cost, and a noise are reduced. A transaxle case includes a casing a housing and a center support defining an internal space of the transaxle case. In the casing, one end of a rotor shaft of a motor is supported by an outer wall and a stator of the motor is fixed to the outer wall. The center support is attached to the casing or the housing in the transaxle case while supporting an other end of the rotor shaft and an other end of the rotary shaft; and the casing and the housing are fastened to each other.

In an oil passage structure for a power transmission device including a case provided to accommodate a power transmission device, a baffle plate attached to an inner wall of the case, and an oil pump, the oil passage structure includes a supply oil passage through which oil is pumped from the oil pump to an oil supply destination via the baffle plate. A plate oil passage, which constitutes a portion of the supply oil passage, a supply port, which allows the oil discharged from the oil pump to flow into the plate oil passage through the supply port, and a first discharge port, which allows the oil supplied to the oil supply destination to be discharged through the first discharge port, are formed in the baffle plate.

A housing for a gear unit includes a housing top part mounted on a housing bottom part, a first bearing mounting for a first bearing of a shaft being formed by a first bearing carrier of the housing top part and a first bearing carrier of the housing bottom part, a second bearing mounting for a second bearing of a shaft being formed by a second bearing carrier of the housing top part and a second bearing carrier of the housing bottom part, a first end area of a first bearing carrier of the housing bottom part and a first end area of a second bearing carrier of the housing bottom part being joined by two end plates set apart from each other.

In an oil passage structure for a power transmission device including a case provided to accommodate a power transmission device, a baffle plate attached to an inner wall of the case, and an oil pump, the oil passage structure includes a supply oil passage through which oil is pumped from the oil pump to an oil supply destination via the baffle plate. The baffle plate has a structure in which two members of a plate body and a plate-shaped auxiliary member are superposed and integrated with each other. The baffle plate is provided with a plate oil passage that constitutes a portion of the supply oil passage and passes through the inside of the baffle plate. The plate oil passage is formed by a recess provided in at least one of a surface of the plate body and a surface of the auxiliary member which face to each other such that the auxiliary member is interposed on the plate body.

A planetary gear train of an automatic transmission for a vehicle improves power delivery and fuel efficiency by applying six control elements to four planetary gear sets to achieve forward nine speed stages and one reverse speed stage. The planetary gear train includes: an input shaft; an output shaft; first to fourth first planetary gear sets each having three rotational element: four clutches and two brakes as the six control elements; and first to ninth shafts. In particular, the first shaft connects a first rotational element and the input shaft; the second shaft is connected with a second rotational element and selectively connected with the first shaft; the third shaft connects third and fifth rotational elements; the fourth shaft is connected with a fourth rotational element and fixed to a transmission housing; and the fourth shaft is connected with the fourth rotational element and fixed to the transmission housing.