A universal joint includes a driving portion and a joint head. The driving portion includes a ball nest and a polygonal column disposed within the ball nest. The joint head includes a working end portion and a ball head portion, and the ball head portion is rotatably and swingably disposed within the ball nest. A shaped of the ball head portion corresponds to a shaped of the ball nest, and the polygonal column is co-rotatable with the ball head portion. The ball head portion including a polygonal groove, and the polygonal column is inserted within the polygonal groove.

A drivetrain for a vehicle, such as a commercial vehicle, may have an electric motor with a maximum output torque of at least 4000 Nm. The drivetrain may also have at least one constant velocity joint and an axle differential. The electric motor may be connected or connectable to the axle differential via the at least one constant velocity joint.

A centering structure is provided in a device including a first member with an inner peripheral surface and a second member with an outer peripheral surface opposed to the inner peripheral surface. The centering structure includes outer peripheral cam surfaces circumferentially aligned on the inner peripheral surface of the first member, inner peripheral cam surfaces opposed to the outer peripheral cam surfaces, and rolling elements. The inner peripheral cam surfaces form accommodation spaces together with the outer peripheral cam surfaces therebetween. The rolling elements are disposed in the accommodation spaces. Each rolling element rolls along each outer peripheral cam surface and each inner peripheral cam surface. The rolling elements move the first or second member in a direction to cause a center of the inner peripheral surface and a center of the outer peripheral surface to be matched when the first and second members are rotated relative to each other.

A steering assembly includes an outer housing and a drive shaft extended longitudinally within the outer housing and defining a plurality of pockets. A plurality of torque transfer features transfer torsional loads from the outer housing to the drive shaft, each torque transfer feature including a shank received within a corresponding one of the plurality of pockets. One or more elastic mounts positioned within each pocket interpose the shank and an inner wall of each pocket.

A universal join is provided, including a driving portion and a joint head. The driving portion includes a ball nest and a polygonal column disposed within the ball nest. The joint head includes a working end portion and a ball head portion, and the ball head portion is rotatably and swingably disposed within the ball nest. A shaped of the ball head portion corresponds to a shaped of the ball nest, and the polygonal column is co-rotatable with the ball head portion. The ball head portion including a polygonal groove, and the polygonal column is inserted within the polygonal groove.

A constant velocity joint boot assembly includes a flexible boot having a flexible portion extending between a first end and a second end along an axis. The first end is disposed about a portion of a constant velocity joint and the second end is disposed about a portion of a shaft assembly. The first end defines a skirt having an engineered portion that elastically absorbs and/or reflects impact energy.

A constant velocity joint boot assembly includes a flexible boot having a flexible portion extending between a first end and a second end along an axis. The first end is disposed about a portion of a constant velocity joint and the second end is disposed about a portion of a shaft assembly. The first end defines a skirt having an engineered portion that elastically absorbs and/or reflects impact energy.

The present invention provides a grease composition for constant velocity joints, which includes a lubricating base oil, a thickener including a nitrogen-containing compound, a triglyceride, a diester, and a boron nitride, wherein a total content of the triglyceride and the diester is 1 to 5 mass % based on a total amount of the grease composition, and a mass ratio of a content of the triglyceride to a content of the diester (triglyceride/diester) is 0.3 to 1.5.

The present invention provides a grease composition for constant velocity joints, which includes a lubricating base oil, a thickener including a nitrogen-containing compound, a triglyceride, a diester, and a boron nitride, wherein a total content of the triglyceride and the diester is 1 to 5 mass % based on a total amount of the grease composition, and a mass ratio of a content of the triglyceride to a content of the diester (triglyceride/diester) is 0.3 to 1.5.

A constant velocity joint boot assembly includes a flexible boot having a flexible portion extending between a first end and a second end along an axis. The first end is disposed about a portion of a constant velocity joint and the second end is disposed about a portion of a shaft assembly. The first end defines a skirt having an engineered portion that elastically absorbs and/or reflects impact energy.