F - Mech Eng,Light,Heat,Weapons – 16 – C
Patent
F - Mech Eng,Light,Heat,Weapons
16
C
64/3, 18/689
F16C 3/02 (2006.01) B29C 45/14 (2006.01) B29C 65/54 (2006.01)
Patent
CA 1292126
END CONNECTION FOR COMPOSITE SHAFTS Abstract An end connection for a shaft made of fiber reinforced plastic, or structural composite material, to another member, such as an output shaft from a motor, gear box or other transmission, which accommodates for differences in stiffness, thermal expansion, chemical resistance between the composite shaft and the other member and operates under oscillating torque, thrust, and bending loads, and also provides for manufacturing flexibility in enabling the shaft and connection to be produced as separate parts which are formed when final assembly is to occur. The connection has a male insert which is connectable to the output shaft, and is inserted into the end of the composite shaft. Axial and circumferential grooves are cut in the surfaces of the male insert and the inside surface of the structural composite shaft, which define the interface therebetween. These grooves are aligned to form circumferential and axial keyways which intersect each other. A resin, or a mixture of resins and reinforcement material is injected into the keyway and permitted to polymerize to form structural keys which transmit the thrust and torque, while locking the insert member and the shaft permanently together. The bending loads are transmitted through the tight fit extending axially between the composite shaft, insert member and keys. The radial thickness of the end of the shaft, the amount and orientation of the reinforcing fibers therein and the insert are matched so that their stiffness index (related to the product of their Young's modulus and their area moments of inertia) approximately match. The composite shaft may be connected to a mixing impeller to provide a reliable support and drive therefor.
531022
Blakley Robert A.
Mcdermott Keith T.
Salzman Ronald N.
Schutte Marlin D.
Borden Ladner Gervais Llp
General Signal Corporation
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