US 5,626,532 AGranted

Drive assembly with interference-fit mounted lightweight non-ferrous pulley

AssigneeTesma International Inc.

InventorZdenek Cerny

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Abstract

A drive assembly for rotating a shaft of a pulley-driven device is disclosed together with a method of making the drive assembly. The method includes the steps of forming a pulley of lightweight non-ferrous metal having a web portion, forming a radially inward portion of the web portion into an axially extending annular portion, mounting a connecting ring of ferrous metal having an annular groove in an interior end surface thereof over the axially extending portion of the web portion so that a free end of the axially extending portion extends adjacent the annular groove, cold-forming the free end to fill the annular groove, welding a hub of ferrous material to the connecting ring and machining a central axial bore through the web portion and the axially extending portion thereof and the hub.

Claims17

Dependent claims

A drive assembly for rotating a shaft of a belt driven device comprising

a hub in the form of an annular body of ferrous metal having a radially outwardly projecting annular portion,
a pulley made of light weight non-ferrous metal, and
a connecting ring of ferrous metal,
said pulley having a web portion formed with an axially extending annular portion at a radially inward position thereon,
said connecting ring being disposed in surrounding relation with said axially extending annular portion and having a connection therewith constructed and arranged to rigidify said connecting ring and said pulley,
said hub having a connection with said connecting ring constructed and arranged to rigidify said hub with said pulley through said connecting ring,
said web portion including the annular extension thereof and said hub having a bore therethrough defining a single machined annular shaft-engaging surface,
said shaft-engaging surface being constructed and arranged to engage a periphery of the shaft in an interference-fitted manner so as to maintain torque transfer between the pulley and shaft in the event of the failure of either or both of said connections,
said hub and said connecting ring being constructed and arranged with respect to said axially extending annular portion to provide an annular space adjacent the radially outwardly projecting annular portion of said hub of a size to allow a pulling tool to enter the annular space and act upon said radially outwardly projecting annular portion to remove said pulley from the periphery of the shaft.

6 more elements

A drive assembly in combination with a vehicle hydraulic power steering pump, the power steering pump including a drive shaft, said drive assembly comprising

a hub in the form of an annular body of ferrous metal having a radially outwardly projecting annular portion,
a pulley made of light weight non-ferrous metal, and
a connecting ring of ferrous metal,
said pulley having a web portion formed with an axially extending annular portion at a radially inward position thereon,
said connecting ring being disposed in surrounding relation with said axially extending annular portion and having a connection therewith constructed and arranged to rigidify said connecting ring and said pulley,
said hub having a connection with said connecting ring constructed and arranged to rigidify said hub with said pulley through said connecting ring,
said web portion including the annular extension thereof and said hub having a bore therethrough defining a single machined annular shaft-engaging surface,
said shaft-engaging surface being constructed and arranged in engagement with a periphery of the shaft in an interference-fitted manner so as to maintain torque transfer between the pulley and shaft in the event of the failure of either or both of said connections,
said hub and said connecting ring being constructed and arranged with respect to said axially extending annular portion to provide an annular space adjacent the radially outwardly projecting annular portion of said hub of a size to allow a pulling tool to enter the annular space and act upon said radially outwardly projecting annular portion to remove said pulley from the periphery of the shaft.

6 more elements

Dependencies are inferred from the claim text.