Surfaces of the polygon or piston base stroke disc of...

Details Surfaces of the polygon or piston base stroke disc of... Surfaces of the polygon or piston base stroke disc of...

2006-08-08

2006-08-08

Lazo, Thomas E. (Department: 3745)

Expansible chamber devices

Abutment connection between working member and power...

C092S159000

Reexamination Certificate

active

07086324

ABSTRACT:
The invention relates to the surfaces of the polygon (2) and/or the plunger foot plate (3) of a high-pressure pump for a diesel motor, at least one of the surfaces having cavities at least in the contact area between the polygon (2) and the plunger foot plate (3). According to the invention the face of the plunger foot plate (3) lying opposite the polygon (2) is concave, at least in the load-free state and the cavities have a depth of between 5 and 50 μm, a width of between 30 and 100 μm and a length of at least 100 μm, or a diameter ranging between 30 and 100 μm. The edges of the cavities are rounded. The invention also relates to a method for producing said surfaces, according to which the cavities are first created in the surface by means of chemical etching, blasting using blasting agents or by means of a laser removal process, the surface is subsequently polished in a vibratory grinding process and the edges of the cavities are rounded.

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German codes of practice DIN 1494 Teil 3.

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