Gm Global Technolgoy Operations, Inc.

Roger L Briggs

Martin Stephen Kramer

Steven J Ross

Ronald P Buffa

Matthew P Werner

A pulley for a continuously variable transmission and a method of creating an engineered surface on an outer surface of a pulley of a continuously variable transmission, with the engineered surface engaging with a belt or chain of the continuously variable transmission. The method comprising the steps of: determining an actual engineered roughness (Rpk) on the outer surface needed to obtain a predetermined friction between the engineered surface and the belt or chain; and etching microgrooves in at least a portion of the outer surface to create the engineered surface by employing a laser to etch the microgrooves, the microgrooves being formed to a depth that produces the actual engineered roughness (Rpk).

CVT pulley with engineered surface

A method of re-manufacturing a shaft-hub assembly to be used in a transfer case, the method including the steps of: determining an initial diameter of a journal bearing of a main shaft that has been used in the transfer case; comparing the determined initial diameter to a predetermined minimum threshold, and discarding the main shaft if the determined initial diameter is below the predetermined minimum threshold; if the determined initial diameter is above the predetermined minimum threshold, preparing the bearing surface of the journal bearing for a thermal spray process; thermally spraying an aluminum bronze material onto the bearing surface; and machining the aluminum bronze material to achieve an outside diameter that provides a desired running clearance with a corresponding finished inside diameter of a central bore for a hub to which the main shaft will be assembled in the transfer case.

Main shaft remanufacturing

A method is provided for repairing a cylinder head having corrosion and erosion of the gasket sealing surface around the coolant inlet. The engine is disassembled and the corroded material is machined to a selected depth and width creating a pocket having a bottom wall surface and an annular side wall surface surrounding the coolant inlet port. An annular insert is provided having an annular outer side wall, a top wall, a bottom wall, and a central opening. The insert has a thickness greater than the depth of the machined pocket. An adhesive is applied the insert is pressed into the pocket. After curing of the adhesive, the top wall of the insert is machined to a dimension flush with the sealing surface of the head thereby creating a proper sealing surface for the subsequent seating of a replacement gasket.

Repair method for corroded engine cylinder head

A shaft assembly comprises an annular hub with a shaft extending therefrom. The hub and the shaft are integrally formed from a single forging, thereby reducing stress concentration locations within the assembly. The hub includes a circumferential wall having a wall thickness. A plurality of teeth protrude from the circumferential wall. Each of the plurality of teeth has a tooth thickness, with the tooth thickness being greater than the wall thickness. Splines are formed on an outer surface of the shaft. Preferably, the splines are induction hardened. A method of manufacturing the shaft assembly includes forging a base member and flow forming the base member into the hub and the shaft to create the shaft assembly. Next, the plurality of teeth are formed within the hub. Finally, the splines are formed on the shaft, and preferably induction hardened.

Shaft assembly and method of manufacture thereof

A method is provided for remanufacturing a transmission assembly including an output shaft having an input end positioned adjacent an input sun gear. The method includes machining a pocket into the input end of the output shaft. A first roller needle bearing is positioned inside the pocket. The input sun gear is then replaced with a modified sun gear having a protruding center support hub configured to extend into the pocket and cooperate with the first roller needle bearing, thereby supporting the output shaft to prevent tilting of the output shaft to reduce wear.

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Lake Orion, MI, United States of America

Roger L Briggs