Method and apparatus for producing rotationally symmetrical valve seat faces of high surface quality in valves

US6178637A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Stefan Herold · Hallstadt, DE
• Oliver Kirsten · Kulmbach, DE

Key dates

• Filing date: Sep 19, 1997
• Grant date: Jan 30, 2001
• Expiry date: Sep 19, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49895
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

In known methods for producing rotationally symmetrical valve seat faces, the valve closing body is brought into contact with the valve seat face of the valve seat body, set into a rotary motion, and set parallel to the rotary axis into an oscillating motion of high frequency. When the valve is assembled, care must then be taken that this pairing of the valve closing body and the valve seat body is preserved. In the novel method, the valve seat body is inserted into a receiving body and fixed by means of a tappet. A spherical tool body engages the valve seat face of the valve seat body with a contact pressure force and rotates in a rotary direction that is opposite a rotary direction of the valve seat body. The valve seat body axis and the tool body rotary axis are inclined relative to one another, so that a lubricant introduced can constantly build up a film of lubricant between the tool body and the valve seat face, and an elastic deformation ensures in the valve seat face, producing a relatively broad smoothing trace without significant indentation. The method and the apparatus are especially well suited to machining valve seat faces of fuel injection valves for fuel injection s…