WIA Corporation Patent applications |
Patent application number | Title | Published |
20100216558 | FIXED TYPE CONSTANT VELOCITY JOINT - A fixed type constant velocity joint comprises: an outer race having an inner spherical surface, and a plurality of guide grooves formed in an axial direction in the inner spherical surface of the outer race, each guide groove having a circular shape in a longitudinal cross section thereof; an inner race having an outer spherical surface, and a plurality of guide grooves formed in an axial direction in the outer spherical surface of the inner race, each guide groove having a circular shape in a longitudinal cross section thereof, said guide grooves of the outer race and said guide grooves of the inner race together forming a plurality of ball guide tracks arranged around the circumference of the joint; a plurality of balls disposed in the ball guide tracks; and a cage installed between the inner spherical surface of the outer race and the outer spherical surface of the inner race, said cage having a plurality of windows for retaining the balls therein. The ball guide tracks include first tracks and second tracks with different groove configurations and having dual, multiple, or differentiated center offsets with smaller offsets applied to the tracks having relatively large ball movements and larger offsets applied to the tracks having relatively small ball movements as the joint is articulated for assembling. | 08-26-2010 |
20100190558 | FIXED TYPE CONSTANT VELOCITY JOINT - A constant velocity joint for a drive system comprises: an outer race having an inner spherical surface, and a plurality of guide grooves formed in an axial direction in the inner spherical surface of the outer race; an inner race having an outer spherical surface, and a plurality of guide grooves formed in an axial direction in the outer spherical surface of the inner race, said guide grooves of the outer race and said guide grooves of the inner race together forming a plurality of ball guide tracks; a plurality of balls disposed in the ball guide tracks; and a cage installed between the inner spherical surface of the outer race and the outer spherical surface of the inner race, said cage having a plurality of windows for retaining the balls therein; wherein each of the guide grooves of the outer race is shaped to have a longitudinal cross section formed with two circular regions with different centers, a first circular region disposed at a first lateral side of the outer race and a second circular region disposed at a second lateral side of the outer race, and a linear region tangentially extending between these two circular regions; and wherein each of the guide grooves of the inner race is shaped to have a longitudinal cross section formed with two circular regions with different centers, a first circular region disposed at a first lateral side of the inner race and a second circular region disposed at a second lateral side of the inner race, and a linear region tangentially extending between these two circular regions. | 07-29-2010 |
20090312108 | CONSTANT VELOCITY JOINT OF TRIPOD TYPE - A constant velocity joint for a drive system with a first rotating shaft and a second rotating shaft, comprises: a hollow housing having a plurality of guide grooves therein, the guide grooves extending in an axial direction of the housing and spaced equally apart in a circumferential direction of the housing; a tripod having a plurality of trunnions, each trunnion positioned in a corresponding one of the guide grooves of the hollow housing; and a roller assembly disposed on each trunnion, the roller assembly including an outer roller for rollably receiving in the corresponding guide groove; wherein the outer roller includes a convex outer surface, the convex outer surface having a first radius (Rry) seen from a cross section taken in an orthogonal direction relative to a central axis of the outer roller, the convex outer surface having a second radius (Rrx) seen from a cross section taken along the central axis of the outer roller, a center of the second radius (Rrx) displaced outwardly from a center of the first radius (Rry), and the second radius (Rrx) being shorter than the first radius (Rry). Each of the guide grooves of the housing includes a concave surface for mating with the convex outer surface of the outer roller, and the guide groove further includes a plurality of recess areas respectively recessed from the concave surface of the groove, and thereby defining widened spaces between the guide groove of the housing and its corresponding upper and lower portions of the convex outer roller. | 12-17-2009 |
20090143149 | Constant Velocity Joint of Tripod Type - A constant velocity joint for a drive system with a first rotating shaft and a second rotating shaft, comprises: a hollow housing having a plurality of guide grooves therein, the guide grooves extending in an axial direction of the housing and spaced equally apart in a circumferential direction of the housing; a tripod having a plurality of trunnions, each trunnion positioned in a corresponding one of the guide grooves of the hollow housing; and, a roller assembly including an inner roller, the inner roller having a spherical inner face for receiving a corresponding one of the trunnions therein, and an outer roller mounted on an outer face of each inner roller, the roller assembly for transmitting a load between the first and second rotating shafts to drive the driving system. Each trunnion includes two opposing spherical contact surfaces disposed in the directions subject to the load, and two opposing side surfaces disposed between the two opposing spherical contact surfaces and in the directions perpendicular to the spherical surfaces and not subjecting to the load. A cross sectional shape of the trunnion, the cross section taken in a direction perpendicular to the longitudinal axis of the trunnion, has a thickness at one or both lateral sides of the trunnion the same as or slightly less than a maximum non-interfering thickness of the trunnion, the maximum non-interfering thickness measured with the inner roller inclined by a predetermined degree relative to the longitudinal axis of the trunnion to assemble the trunnion into the inner roller. Preferably, a groove of circular or oval shape is formed on each of the two opposing spherical contact surfaces, the groove for retaining grease therein to lubricate contact surfaces between the inner roller and the trunnion. | 06-04-2009 |
20090011843 | Constant Velocity Joint of Tripod Type - A constant velocity joint for a drive system of a vehicle comprises: a spider trunnion for transmitting torque between first and second shaft of the drive system, the spider trunnion including a spherical outer surface; and a roller assembly operatively attached on the spider trunnion, the roller assembly including an inner roller, an outer roller, and a plurality of needle rollers engaged between the inner and outer rollers, wherein the inner roller includes a tapered outer surface with a taper angle (θt), and the outer roller includes a tapered inner surface with the same taper angle (θt). The taper angle (θt) is preferably in a range from about 0.23° and to about 1.17°, and selected in consideration of both accommodating the inner roller to move without jamming in an entire effective movement range under presence of a maximum joint angle of the drive system, and preventing self separation of the roller assembly by jamming stop between the inner, outer and needle rollers due to the tapered structure of the rollers. The inner roller is preferably configured to have a ratio LL/RR | 01-08-2009 |
20090008206 | Transfer Case With Clutch Actuator - A transfer case for selectively coupling a secondary driveline with a primary driveline comprises: a first output shaft; a second output shaft; a clutch assembly disposed at the second output shaft, the clutch assembly including inner and outer drum members, one of the inner and outer drum members rotatable in association with rotation of the first output shaft and the other one of the inner and outer drum members coupled with the second output shaft, the clutch assembly further including a plurality of frictional clutch plates, the frictional clutch plates formed of at least one frictional clutch plate coupled with the inner drum member and at least one frictional clutch plate coupled with the outer drum member; an actuator shaft rotatably coupled with an actuator; and a clutch actuator means coupled with the actuator for applying axial force to the frictional clutch plates to transmit a drive torque of the first output shaft to the second output shaft. The clutch actuator means can be a pivot lever pivotally moveable in association with rotation the actuator shaft coupled with the actuator for said applying the axial force to the frictional clutch plates, or can be a sliding lever moveable in an axial direction of the actuator shaft in association with rotation the actuator shaft coupled with the actuator. | 01-08-2009 |