Abstract:
A wheel mounting (A, B, C, D) includes a wheel (W), a hub (4), a spindle (2) and a pair of indirectly mounted tapered roller bearings (6) and (8) between the hub (4) and the spindle (2). A seal carrier (100) and an end cover plate (122) close the end of the hub (4) and form one end of a sealed chamber (128) at the end of the spindle (2). A seal (130, 136) carried by the seal cover (100) bears against a seal surface (94) which, in effect, is carried by the spindle (2) and defines the other end of the chamber (128). A first passageway (26, 60, 64, 70, 96) connects a source of pressurized air (28) remote from the bearings (6, 8), along the spindle (2) to the chamber (128). A second passageway (44, 110, 118) connects the interior of the tire (T) through the hub (4) and end ring (100) to the chamber (128). Thus, the mounting (A, B, C, D) permits the transfer of air to or from the tire (T) while the wheel (W) is rotating.
Abstract:
A bearing actuator module comprises a support bearing assembly having a mounting ring (1) adapted to be mounted to an application support structure; a rotatable gear (G2) received within the mounting ring for rotation relative to said mounting ring. A drive subassembly (DS) which rotates said rotatable gear (G2) is removably received in the support bearing assembly. The drive subassembly comprises a stationary gear (G1), a plurality of pinion assemblies, each of which comprises a first pinion P1 which meshes with the gear G1 and a second pinion which meshes with the gear G2. The pinion assemblies are mounted in a carrier (10), which is rotated by a motor (M). A brake assembly (B) is provided to prevent rotation of the rotatable gear (G2) when the motor is not activated. Additionally, a feed back or position sensor is provided which indicates the relative rotational position of the carrier (and hence of the rotatable gear (G2)).
Abstract:
A transmission for a wind turbine includes a housing (20) in which two shafts (26, 28) rotate, each being supported on a locating bearing (50, 60) which transmits thrust loads to the housing as well as radial loads and on a nonlocating bearing (48, 58) which transmits only radial loads to the housing. The shafts carry helical gears (52, 52, 62) which induce thrust loads in the shafts when the shafts transmit torque. The locating bearings are unitized single row tapered roller bearings which are oriented to transmit thrust loads in the primary direction through their raceways (132, 138) and in the secondary direction through ribs (134, 144) at the ends of their rollers (146). The nonlocating bearings take the form of single row cylindrical roller bearings which accommodate differential thermal expansion and contraction between the shafts and housing.
Abstract:
A bearing cage assembly (100) comprises a plurality of discrete bridge elements (206) disposed between adjacent rolling elements (1 12) and coupled between first and second axially spaced cage support wire rings (1 02, 1 04) which are appropriately tensioned. Spacers (1 10) are disposed between adjacent bridge elements and engage the bridge elements in a piloted engagement. The bridge elements maintain a separation between rolling elements, retain the rolling elements within the bearing assembly, and function as a lubrication reservoir for grease lubricated bearings. Profiled surfaces on the bridge elements position the bearing cage assembly on at least one axial end of the rolling elements.
Abstract:
A flexpin assembly (B) for an epicyclic gear system (A) includes a flexpin (20) that at one end is cantilevered from a carrier end wall (12) and a sleeve (22) that surrounds the flexpin and is cantilevered from the flexpin at the other end of the flexpin. In addition, the assembly has an antifriction bearing (24) for supporting a planet pinion (6) around the sleeve. The flexpin has a base (30) that is configured to be anchored to a carrier wall, a head (32) to which the sleeve is attached, and a shank (34) located between the base and head. The sleeve has a mounting segment (78) that is connected to the head of the flexpin without a weld. Both may have tapered surfaces secured in contact by a plate (66) clamped against the mounting portion with screws (68) that thread into the head, thus enabling the sleeve to be detached from the pin. The head may have a cylindrical surface (72) over which the mounting segment of the sleeve fits with an interference fit exists. The bearing may have rolling elements (106, 108) that surround raceways (86, 88) on the sleeve and a rib ring (94) that confines the rolling elements axially, but can be detached. The flexpin assembly is easily disassembled to facilitate servicing of the gear system.
Abstract:
A locating bearing assembly (10) is provided that optimizes load distribution between bearing rows and for all rolling elements within the rows in either positive or negative torque conditions, by combining a single row tapered roller bearing with an angular contact ball bearing. The outer race (60) for the ball bearing is preloaded by a spring element (72) to prevent the balls (26) from floating freely between the ball bearing's inner and outer raceways (16, 64). This will insure that the balls (26) are always sufficiently loaded to roll along a single axis which is off set from the radial direction. The use of the single row tapered bearing and the preloaded angular contact ball bearing provides for a locating bearing assembly ("LBA") in which the ball bearing supports only reversing axial loads. All radial loads are borne by the tapered roller bearing and transmitted to the bearing assembly housing (30).
Abstract:
An epicyclic gear system (A) has a sun gear (2), a ring gear (4) located around the sun gear (2), and planet gears (6) located between and engaged with sun (2) and ring (4) gears. In addition, it has a carrier (8) including a carrier flange (32) that is offset axially from the planet gears (6), and carrier pins (34) that project from the carrier flange (32) into the planet gears (6), each with a shank (40) anchored to the flange (32) and a head (42) remote from the flange (32). Between the planet gears (6) and the carrier pins (34) are double row tapered roller bearings (50), so that the planet gears (6) rotate on the pins (34). Each bearing (50) includes an inner race (52) having tapered raceways (64 and 66) presented away from the carrier pin (34), opposing tapered raceways (64 and 66) on the planet gear (6), and tapered rollers (58) organized in two rows between the raceways (64 and 66). Whereas the carrier pin (34) is cantilevered from the carrier flange (32), the inner race (84) is cantilevered from the head (42) of carrier pin (34). In operation, the pins (34) will deflect in one direction under torque applied to the carrier (8) and resisted by the planet gears (6), and the inner races (52) will deflect in the opposite direction, so that the axes about which the planet gears (6) rotate remain parallel to the central axis of the system (A). The pins (34) may have grooves (46) to enhance their deflection.
Abstract:
A bearing assembly (A) having stationary inner races (2) and a rotating outer race (3), is configured with rolling elements (RE) disposed between the inner and outer races, and axially enclosed by seals (4) supported on seal carriers (5) which are secured to, and rotate with, the rotating outer race. A lubrication passage (12) is provided radially through each bearing stationary inner race to open into an outer portion (17) of the bearing chamber, at an axial face (14) of an outboard flange (2A) of the inner race. The outer diameter of the outboard flange (2A) is enlarged in a radial direction, to accommodate the lubrication passage opening on the axial face, while an axial width of the outboard flange, and therefore, the overall axial width of the bearing, remains unchanged.
Abstract:
A bearing cage assembly consisting of a plurality of discrete bridge elements coupled between first and second cage support wire rings having selected tensions, and conforming to the surfaces of associated rolling elements. The discrete bridge elements maintain rolling element in separation, provide rolling element retention within the bearing assembly, and function as a lubrication reservoir for grease lubricated bearings. The discrete bridge elements may be disposed between adjacent rolling elements, or may be configured to pass through axial bores of hollow rolling elements
Abstract:
A compact modular assembly of a geared power train (100) and generator (400) suitable for use in a wind turbine application to maximize a step-up ratio between an input and output within a limited radial space. The power train is configured as a hybricyclic split-compound planetary gearing system with a grounded closed carrier flex pin system in a high torque stage (A), and an open carrier flex pin system in a low torque stage (B), having a step up ratio of approximately 30:1. To facilitate modular assembly and disassembly of the power train and generator, each component is mounted independently to opposite sides of a common support structure (500) anchored to a bedplate (502).