A rolling bearing makes use of a porous rolling element and a selected kind of lubricant to impregnate with; is usable in various conditions; does not discharge foreign objects; and features low dust generation and long life. The rolling bearing includes an outer ring 2; an inner ring 1; and a plurality of rolling elements 3 assembled between mutually opposed outer ring track surface 2a and inner ring track surface 1a. The plurality of rolling elements 3 is provided by a combination of a porous rolling element 3a impregnated with a lubricant and a non-porous rolling element 3b.

The present invention proposes a deep groove ball bearing, having an outer ring, an inner ring, spherical rollers located between the inner ring and outer ring, and a cage for holding the spherical rollers. In an axial direction, the inner ring has a first inner ring shoulder at a first side, and a second inner ring shoulder at a second side opposite the first side; and a first inner ring shoulder diameter of the first inner ring shoulder is configured to be larger than a second inner ring shoulder diameter of the second inner ring shoulder. The present invention further proposes a differential including the deep groove ball bearing.

An assembly has a radial ball bearing including a bearing inner ring, and a rotatable shaft with a shaft end region with a bearing seat. The bearing seat has a shoulder on one side, on which the bearing inner ring of the radial ball bearing is seated for supporting the shaft. The bearing seat is shortened in the longitudinal direction relative to the radial ball bearing, and extends toward a height of the radial ball bearing. The bearing seat terminates at a distance (L) from an orthogonal projection from the proximalmost points of a distalmost row of balls onto the bearing seat surface such that L=k*D, wherein k is in a range between 0.7 and 0.5.

A sealing device for a bearing unit that includes an inner ring, an outer ring, a plurality of rolling bodies interposed between the inner ring and the outer ring, the sealing device having a radially outer anchoring portion, an intermediate portion, and a radially inner sealing portion distal to the radially outer anchoring portion, the sealing device being made of a single polymer plastic material.

A bearing unit having a stationary radially outer ring; a radially inner ring rotatable around a central rotation axis (X) of the bearing unit and provided with at least one raceway and, in a terminal portion thereof, with at least one through hole; at least one row of rolling elements interposed between the radially outer ring and the radially inner ring; and at least one clamping element, which is accommodated in the through hole, to lock the radially inner ring on to a rotating shaft. A first radially outer cylindrical surface of the terminal portion of the radially inner ring has a diameter smaller than the diameter of a second radially outer cylindrical surface of a second terminal portion of the radially inner ring.

A universal joint is provided, including: a seat, including a receiving room extending in an axial direction and at least one through hole in communication with the receiving room; a connecting member, including a ball head rotatably received within the receiving room; and an assembling mechanism, including at least one blocking member and a sleeve member sleeved around the seat, the at least one blocking member being received within the at least one through hole and blockable with the ball head in the axial direction, the sleeve member covering the at least one through hole; wherein the seat has a first hardness, the sleeve member has a second hardness smaller than the first hardness, an outer circumferential wall of the seat is partially embedded within an inner circumferential wall of the sleeve member.

A sealing arrangement having a rod seal for sealing a cavity for a flowable medium in the region of a rod includes an output apparatus for discharging the flowable medium. The rod is movably supported in a housing to be displaced in an axial direction. The housing has a bearing portion, wherein the rod seal is supported in a fixed manner and wherein the rod extends through the bearing portion and the rod seal so that a first rod portion and a second rod portion are arranged at different sides of the bearing portion. The first rod portion is located at a side facing the cavity and the second rod portion is located at a side facing away from the cavity. The rod seal is arranged at the side of the bearing portion facing the first rod portion and has a first sealing lip and a second sealing lip that are spaced apart from each other in the axial direction and circumferentially contact the rod. The bearing portion facing the cavity has a discharge structure having a support face which circumferentially surrounds the rod. The rod seal is in abutment with the support face and the support face has a diameter which increases in the direction of the second rod portion.

A bearing cage is used for accommodating the rolling elements of a rolling bearing; wherein, the bearing cage comprises an annular cage base; when the bearing cage is inserted and installed in the rolling bearing, there is a first circumferential radial clearance between an outer circumferential surface of the cage base and an inner circumferential surface of an outer ring shoulder of an outer ring, and a second circumferential radial clearance between an inner circumferential surface of the cage base and an outer circumferential surface of an inner ring shoulder of an inner ring; the first circumferential radial clearance is smaller or larger than the second circumferential radial clearance. A rolling bearing comprises the bearing cage as described above.

A hydrodynamic bearing includes a main body. The main body has an inner hole. The inner hole includes a first space and a second space at either end of the first space. An inner wall of the second space is formed with 9-16 hydrodynamic grooves. The hydrodynamic grooves each have a V shape and are arranged at equal intervals. The hydrodynamic grooves each have a bend angle of 30°-50°. The hydrodynamic bearing effectively improves the pressure generating effect of the product and enhances the rotation accuracy of a rotary shaft, meeting the needs of customers.

An outer ring case includes an annular guide groove housing an end of each of a plurality of inner rollers. A groove width representing a radial length of the guide groove is greater than a diameter of each inner roller. A radius representing a distance from a bearing axis to an inner wall face of the guide groove that is radially outer is smaller than a distance from the bearing axis to an axial center of each of rollers plus a radius of each inner roller.