Double wrap brake band
AssigneeBorg-Warner Corporation
InventorsJohn C. Blinks, Lauri J. Kivisto
Life of this patent
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Abstract
An improved double wrap brake band for an automatic transmission and the method of making the band wherein the band is lightweight and heat set round at the released open position with the utilization of thinner strap material at higher hardness ranges. The band is formed from a preslotted and preformed strap and a stamped one-piece bracket member secured to the strap. The band subassembly is heat treated and heat set, the interior surface is acid etched and a preslotted friction lining applied to the interior treated surface, the subassembly is sized, and the connecting ties for both the strap and bracket member are removed to provide the final band assembly.
Claims29
A double wrap brake band comprising three substantially parallel curved bands joined by a sheet metal bracket member to form a substantially round double wrap band, the bracket member including a transverse connecting bar portion joined to the ends of all three bands, an anchor portion joined to the ends of the outside bands and having a raised central bridging section to allow the central band to pass thereunder, and an apply portion joined to the end of the central band;
- the outside bands extending from the connecting bar portion in one direction and the central band extending from the bar portion in the opposite direction of rotation, said apply portion having a lip adapted to receive the end of an actuating piston, and said anchor portion having at least one ridge extending at least partially across the anchor portion with at least one upwardly bent locating member.
An intermediate assembly in the process of forming a double wrap brake band including an elongated curved sheet metal strap having longitudinally extending elongated parallel slots separated by transverse ties and generally defining three parallel bands, said slots opening into both ends of the strap, and an anchor bracket member secured to the opposite ends of the strap, said bracket member including a transverse connecting bar portion, a transverse anchor portion joined to the connecting bar portion by parallel ties, and a central apply portion on the opposite side of the connecting bar portion and attached thereto by a longitudinally extending tie.
A one-piece bracket member adapted for use in the manufacture of a double wrap brake band, said one-piece bracket member being formed from sheet metal and having a transverse connecting bar portion, an anchor portion and an apply portion connected by longitudinally extending ties, said anchor portion having a ridge extending transversely across the bracket member, the bracket member portions being adapted for welding to the opposite ends of an elongated flat strap.
A one-piece bracket member adapted for use in the manufacture of a double wrap brake band, said one-piece bracket member being formed from sheet metal and having a transverse connecting bar portion, an anchor portion and an apply portion connected by longitudinally extending ties, a pair of generally parallel ties joining the transverse connecting bar and anchor portions and a single tie joining the transverse connecting bar and apply portions, said anchor portion having a ridge extending transversely across the bracket member, the bracket member portions being adapted for welding to the opposite ends of an elongated flat strap.
Dependencies are inferred from the claim text.