Wobble piston and seal assembly for oil free compressor

Details Wobble piston and seal assembly for oil free compressor Wobble piston and seal assembly for oil free compressor

F - Mech Eng,Light,Heat,Weapons

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F04B 53/14 (2006.01) F04B 39/00 (2006.01) F04B 39/04 (2006.01) F04B 53/02 (2006.01)

Patent

CA 2296259

An improved wobble piston and seal assembly for an oil free air compressor. The piston has a seal support surface which is provided with an upwardly directed curve adjacent its perimeter. A flat annular seal is secured to the piston to be supported by the support surface. The curve imparts a limited bend to the seal adjacent the perimeter of the piston. The piston and seal are then inserted into a cylinder which increases the bend to substantially 90°. The region of the bend in the seal adjacent the top of the piston is supported by the curved top to reduce flexing during operation at high air pressures. By preventing a reduction in the bend radius at high air pressures, stress in the seal at the bend is reduced, permitting use of a harder more durable seal material.

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