| 摘要 |
An arrangement including a portion of a radially outer lateral surface of an inner ring of wheel hub on which an annular step is formed on the side of a constant velocity joint. The step is an L-shaped fold of a sleeve portion of a first shield that is protrudingly mounted, a flange portion of which shield radially extends so as to protrude towards an outer ring of a wheel hub, in front of a flange portion of a second shield; the L-shaped fold defines, with a wing thereof, a tubular element arranged straddling wheel hub and an outer ring of the constant velocity joint, which has a free end supporting an annular seal; an annular signal generating insert completely covers a face of the flange portion where it is provided with a shallow recess defining, together with the L-shaped fold, a thrust shoulder for mounting the first shield. |
| 主权项 |
1. An arrangement of a wheel hub (3) connected to constant velocity joint (6) provided with a seal device (1), comprising:
a sealing assembly (14) disposed between an inner ring (5) and an outer ring (8) of the wheel hub (3) and extends straddling between the wheel hub (3) and an outer ring (10) of the constant velocity joint (6); wherein the sealing assembly (14) comprises a first shield (16) and a second shield (21) anchored by means of their respective sleeve portions (17, 117) to the inner ring (5) and to the outer ring of the wheel hub, respectively, and having each a respective flange portion (18, 118) that radially extends to protrude from the sleeve portion and towards the other shield, and an annular sealing element (11) supported by one of the first and second shields and having a plurality of annular sealing lips (22, 23, 24) that cooperate with the other shield; the flange portion (18) of the first shield (16) externally carrying towards the constant velocity joint (6) a signal generating element (19) consisting of an annular insert (19b); and the sleeve portion (17) of the first shield comprising a first portion defined by a first L-shaped fold (40) that axially extends to protrude from the flange portion and towards the second shield (21), and a second portion defined by a U-shaped fold (41), radially overlapping in contact with the portion defined by the first L-shaped fold (40) on the side of the inner ring (5) and axially extends backwards with respect to the first L-shaped fold (40), towards the constant velocity joint (6) and beyond the flange portion (18), the second portion ending, on a side opposite to the first portion, with a second L-shaped fold (43), which extends radially towards the interior of the sleeve portion (17) and axially protrudes from the inner ring (5) and with respect to the flange portion (18) towards the constant velocity joint (6), thus forming a tubular element (32) adapted to straddle between the wheel hub (3) and the constant velocity joint (6), concentric with the inner ring (5); wherein the annular insert (19b) forming the signal generating element (19) is provided as an annular insert having predetermined thickness, measured in the axial direction, of a magnetizable elastomeric or synthetic plastic material, which axially protrudes from the first face (20) of the flange portion of the first shield (16) to which the annular insert has been chemically anchored, and is shaped to completely cover the first face (20) and extend onto the second L-shaped fold (43); and wherein, in combination, i) the seal device (1) comprises a portion (30) of a radially outer lateral surface (26) of the inner ring on which an annular step (25) is obtained on the side of the constant velocity joint (6) and at an end (31) of the inner ring facing the constant velocity joint; ii) the second L-shaped fold (43) is accommodated with axial clearance into the annular step (25) and is shaped to define with a first wing (44) thereof, parallel to the flange portion (18) of the first shield, a first axial and annular shoulder (27), facing the constant velocity joint (6) and arranged axially spaced apart from a second axial shoulder (28), defined by the annular step (25), the first axial shoulder (27) axially protruding into the annular step (25) with respect to a first face (20) of the flange portion of the first shield (16) facing the side opposite to the first portion of the sleeve portion of the first shield; and iii) the sleeve portion (17) of the first shield is fluid-tightly fitted onto the radially outer lateral surface (26) of the inner ring, outside the annular step (25) and in a position immediately adjacent to the annular step; iv) the annular insert (19b) extending onto the second L-shaped fold (43) to also cover the first axial shoulder (27) defined by the first wing (44) of the second L-shaped fold. |
