Process and apparatus for producing a linkage of an air/fuel ratio detector holder to an exhaust pipe
AssigneeDaimlerChrysler AG
InventorsPierre Bonny, Thomas Huelsberg
Life of this patent
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Abstract
A process and a device produces a linkage of a hollow cylindrical air/fuel ratio detector holder to an opening for the impingement of the air/fuel ratio detector, which is fastened into the holder, to an exhaust pipe equipped with exhaust gas. A desired finished shape is given through internal high-pressure remodeling of a blank pipe. During this process, internal high-pressure remodeling creates a contact surface on the exhaust pipe which is formed by a buckling. The contact surface is created to in the inverted shape of the contact contour of the casing surface of the holder so that a dimensionally stable linkage of an air/fuel ratio detector holder to an exhaust pipe is achieved simply.
Claims5
Apparatus for producing a linkage between an exhaust pipe and a hollow cylindrical air/fuel ratio detector holder with an opening for receiving an air/fuel ratio detector in the holder, comprising means for providing a desired finished shape of the exhaust pipe through internal high-pressure on a buckling portion of the exhaust pipe so as to have an inverted contact contour shape complimentary to a convex casing surface of the detector holder, said means including:
- an internal high-pressure tool divided into an upper die and a lower die for forming a surface by inserting a blank pipe into the desired finished shape of the exhaust pipe, and
- a shaping device integrated into the tool with a contour facing the pipe corresponding to a contact contour of the casing surface of the holder at a location of intended contact surface at the exhaust pipe.
Dependencies are inferred from the claim text.