Structural unit, universal joint bearing and assembling procedure
A structural unit for assembly to a trunnion of a universal joint bearing providing a cup, a sealing ring, which is fixed to the cup, and a shield, which is connected to the cup in a state in which the structural unit is not assembled to the trunnion. The cup includes a bottom and the sealing ring provides at least one sealing lip that points in a direction with an axial component towards the bottom.
1. A structural unit for assembly to a trunnion of a universal joint bearing, the structural unit comprising:
a cup,
a sealing ring fixed to the cup,
a metal ring disposed on the sealing ring and having a first end,
a shield connected to the cup in a state in which the structural unit is not assembled to the trunnion,
the cup comprises a bottom and, on an opposite axial cup side, a radially extending axial portion,
the sealing ring comprises a first end and at least one sealing lip that points in a direction with an axial component pointing towards the bottom; and
wherein the first end of the metal ring and the radially extending portion of the cup abut a first side of a portion of the sealing ring; the shield abutting a second side, opposite from the first side, of the portion of the sealing ring.
2. The structural unit according to claim 1 , wherein the cup comprises a region located at an axial end of the cup and which is spaced as far away from a central axis of the cup, which intersects the bottom, as a region of the shield a central axis which intersects the bottom, the cup further comprises a region which is located at an axial end of the cup and spaced as far away from the central axis as a region of the shield.
3. The structural unit according to claim 1 , wherein the elastomeric ring also contacts an axially extending portion of the shield.
4. The structural unit according to claim 1 , wherein a portion of the shield extends axially outwardly from the cup past the opposite axial cup side such that the portion of the shield is configured to engage the trunnion.
5. A universal joint bearing comprising:
a structural unit for assembly to a trunnion of a universal joint bearing, the structural unit comprising:
a cup,
a sealing ring fixed to the cup, and
a shield connected to the cup in a state in which the structural unit is not assembled to the trunnion, wherein
the cup comprises a bottom, and wherein
the sealing ring comprises at least one sealing lip that points in a direction with
an axial component pointing towards the bottom, wherein an elastomeric ring of the sealing ring contacts the shield at a radially inner surface of the shield.
6. The universal joint bearing according to claim 5 , wherein the shield is directly fixed at the trunnion of the universal joint bearing.
7. The universal joint bearing according to claim 5 , wherein the sealing ring comprises exactly one metal ring and/or exactly one elastomeric ring.
8. The universal joint bearing according to claim 7 , wherein the elastomeric ring encompasses one or both ends of the metal ring in an axial section.
9. The universal joint bearing according to claim 5 , wherein the elastomeric ring also contacts an axially extending portion of the shield an elastomeric ring of the sealing ring contacts the shield at a radially inner surface of the shield and/or at a surface of a portion of the shield which extends in an axial section mainly radially.
10. An assembly procedure for a universal joint bearing, in particular for a universal joint bearing according to claim 5 , wherein the cup comprising the bottom and the sealing ring comprising the at least one lip is pushed onto the trunnion.
11. A universal joint bearing comprising:
a structural unit for assembly to a trunnion of a universal joint bearing, the structural unit comprising:
a cup,
a sealing ring fixed to the cup, and
a shield connected to the cup in a state in which the structural unit is not assembled to the trunnion, wherein
the cup comprises a bottom, and wherein
the sealing ring comprises at least one sealing lip that points in a direction with an axial component pointing towards the bottom, The universal joint bearing according to claim 5 , wherein the sealing ring comprises a metal ring that, when viewed in cross-section, has an S-shape is S-shaped in an axial section and the shape, the S-shape of the metal ring in the axial section is built formed by two end limbs and one intermediate limb, and wherein at least one of the two end limbs comprises a tip that is bent parallelly to the intermediate limb towards the other end limb.
12. A universal joint bearing comprising:
a structural unit for assembly to a trunnion of a universal joint bearing, the structural unit comprising:
a cup,
a sealing ring fixed to the cup, and
a shield connected to the cup in a state in which the structural unit is not assembled to the trunnion, wherein
the cup comprises a bottom, and wherein
the sealing ring comprises at least one sealing lip that points in a direction with an axial component pointing towards the bottom, The universal joint bearing according to claim 5 , wherein a first sealing lip of the sealing ring contacts a radially outer surface of the trunnion in a region that is a straight extension of a raceway of the trunnion for rolling elements of the universal joint bearing, or the first sealing lip of the sealing ring has a maximal distance of one millimeter (1 mm) 1 mm, preferably 0.8 mm, from the radially outer surface of the trunnion in the region that is a straight extension of a raceway of the trunnion for rolling elements of the universal joint bearing.