A sealing device adapted to be disposed between an inner member and an outer member that rotate relative to each other includes a first sealing member including a cylindrical part adapted to be mounted to the outer member, and an annular part that extends radially inward from the cylindrical part; and a second sealing member including a sleeve adapted to be mounted to the inner member, and a flange. The first sealing member includes a lip that extends toward the flange of the second sealing member. An annular first clearance is provided between the flange and the cylindrical part of the first sealing member. The second sealing member includes a labyrinth lip extending from the flange radially outward and extending toward the atmosphere side more than the cylindrical part of the first sealing member, and a second clearance is provided between the labyrinth lip and the outer member.

Provided are a hollow drive shaft using an upsetting method and a method of manufacturing the same, in which hot forging and upsetting processes are applied to both ends of a workpiece so that an outer diameter at both ends of the workpiece is greater than an outer diameter of a middle part of the workpiece, thereby reducing a weight of the drive shaft and enabling the drive shaft to transmit higher driving power. According to the present invention, the upsetting process is applied during the hot forging process to manufacture the hollow drive shaft, portions to be substantially processed are limited to portions at both ends of the workpiece, and the number of upsetting processes is limited to a minimum number (2 or the like), such that initial investment costs and manufacturing costs are low because the number of processes is small.

A seal assembly configured to prevent/limit the entry of external contaminants into a motor compartment of a motorized wheel for vehicles is described. The seal assembly comprises a first support ring which is fixed, a second support ring which is rotatable and radially outermost of the first support ring, and an annular seal interposed between the support rings and including an anchor portion, attached to the second support ring and at least a first and a second annular sealing lip, protruding cantilevered from the anchor portion, mounted by interference between the support rings, defining a sealing configuration, wherein they cooperate with distinct portions of the first support ring along respective annular contact lines, and set by centrifugal effect in a detaching configuration from the respective portions of the first support ring at speeds of the motorized wheel greater than a predetermined non-zero value.

A photographing step of obtaining an original image by photographing a part or all of a sliding surface using a camera is performed and then an imaging process of detecting machining marks on the original image is performed; a detecting step of obtaining a detection image is performed; and an evaluating step of estimating a difference of a rotation torque of the raceway ring member with respect to another raceway ring member on the basis of the detection image in a direction of relative rotation between the raceway ring member and the other raceway ring member when a rolling bearing is constituted by combining a raceway ring member with the other raceway ring member is performed.

A sealing device for a bearing unit, having a stationary part, which is in turn provided with a first metal screen, an elastomer coating co-moulded on to the first screen, and a radially inner contact lip belonging to the elastomer coating, and a rotatable part provided with a second metal screen with which the contact lip makes a sliding contact, the sealing device being provided with at least one appendage which faces a radially inner flanged ring of the bearing unit and interacts with this flanged ring to form a barrier against the entry of contaminants.

A sealing device for a bearing unit, the device having a stationary part provided with: a first metal shield, an elastomer coating, co-molded on the first shield, at least one contacting lip, radially internal, belonging to the elastomer coating. The sealing device having a rotatable part provided with a second metal shield on which the contacting lip makes a sliding contact. The second metal shield is provided with a plurality of flow baffles positioned at least on an axially exposed surface of the shield, shaped as recesses realized through the axially exposed surface and distributed along a radially outer peripheral edge of the shield.

A wheel hub unit provided with a radially outer ring, which is stationary during use; a radially inner ring, which is rotating during use; at least one row of rolling elements interposed between the radially outer ring and the radially inner ring; and a sealing assembly, which is interposed between the radially outer ring and the radially inner ring. The sealing assembly defines, cooperating with the radially outer ring or with the radially inner ring, a shield of at least one labyrinth seal. The labyrinth seal does not have a circumferential symmetry, but comprises an upper portion and a lower portion with respect to an axis of symmetry (A) of the wheel hub unit and is provided with an angular interruption of the shield formed on its lower portion corresponding to the lower side of the wheel hub unit so as to increase an outflow section thereof from the said labyrinth seal. Thereby, facilitating gravity drainage of contaminants present inside the sealing assembly.

In a bearing device for a vehicle wheel (1), a large-diameter section (2i) is formed on an outer side of a fitting cylinder section (2h), and a small-diameter section (2j) is formed on an inner side of the fitting cylinder section (2h). A cap member (8) is formed by bending a metal steel plate, and has a cover plate section (81) which closes the inner open end of an outer member (2) and a fitting section (82) which is fitted over the small-diameter section (2j). A tapered portion (83) based on the spring back angle θ of the fitting section (82) is provided at the outer peripheral edge of the outer end section of the fitting section (82).

A wheel bearing assembly for rotatably mounting and supporting a wheel to a vehicle body may comprise a wheel hub; at least one inner ring;; an outer ring; and one or more rolling elements. An accommodation space in which a constant velocity joint is accommodated may be formed in a vehicle-body-side end portion of the wheel hub, and one or more recesses for accommodating rolling members of the constant velocity joint may be provided in an inner peripheral surface of the accommodation space along a circumferential direction. A boot fastening ring may be mounted on the wheel hub to mount a rubber boot configured to prevent foreign matters from flowing into the accommodation space. The boot fastening ring may comprise a spline portion on an inner peripheral surface thereof, the spline portion may be coupled to a corresponding spline portion formed on an outer peripheral surface of the wheel hub.

A seal assembly for a wheel bearing, may include a core facing an internal side of a wheel bearing assembly; a slinger disposed to face an external side of the wheel bearing assembly; a sealing member fixed to the core, and having a plurality of sealing lips selectively pressed against the slinger; and a deformation unit including a first spring and a second spring mounted on the slinger, and allowing the slinger to deform according to a vehicle speed, wherein the first spring and the second spring are disposed to be parallel to each other.