Land vehicles: wheels and axles – Wheel – With drive or brake attachment
Reexamination Certificate
1999-01-12
2001-07-10
Morano, S. Joseph (Department: 3617)
Land vehicles: wheels and axles
Wheel
With drive or brake attachment
C301S105100, C188S2640AA
Reexamination Certificate
active
06257674
ABSTRACT:
The present invention relates to a wheel hub for a vehicle wheel, comprising a bearing portion with an interior cylindrical opening, in which seats for bearing means are arranged, and a carrier portion which has means for non-rotatable mounting of a brake disc and which is joined to the bearing portion so that an annular gap open at one end of the hub is formed between an exterior cylindrical surface on the bearing portion and interior cylindrical surface on the carrier portion.
Disc brakes in trucks of the heaviest class, where the maximum braking torque is on the order of 20,000 Nm, produce extremely elevated temperatures in the brake discs. It is important to limit as much as possible the heat transfer from the disc via the hub to the components lying thereinside, which must not be subjected to heat expansion, for example, the hub bearing means.
SE-A-469 687 reveals as previously known a wheel hub of the type described by way of introduction, in which the annular gap limits the heat transfer to components lying radially thereinside by creating an axial heat transfer path and thereby substantially extending the path through the metal material from the brake disc to the bearings as compared to a solid hub in which the heat transfer path is entirely radial.
The purpose of the present invention is to farther develop such a previously known wheel hub to additionally reduce the heat transfer from the brake disc to the bearing portion with bearing seats of the wheel hub.
This is achieved according to the invention by virtue of the fact that the annular gap communicates with channels opening in a surface radially outside said bearing seats.
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Carlson Anders
Dagh Ingemar
Morano S. Joseph
Nguyen Long Bao
Volvo Lastvagnar AB
Young & Thompson
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