Hydraulic device

US6843508B2 · kind B2 · utility

Assignee

• Bosch Rexroth Corporation · DE

Inventors

• Karl Cords · Partenstein, DE
• Frank Hofmann · Solingen, DE
• Peter Lauer · Albany, US
• Gotz-Dieter Machat · Lohr am Main, DE
• Karl Meyer · Rieneck, DE
• Konrad Schneider · Fellen, DE
• Hans Wolfges · Lohr, DE

Key dates

• Filing date: Apr 27, 2001
• Grant date: Jan 18, 2005
• Expiry date: Apr 27, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16B33/02
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hydraulic device having a nut part with a threaded hole which has an internal screw thread with a defined nominal diameter and with a defined, uniform pitch, and having a screw part which has an external screw thread with the same nominal diameter as the threaded hole and with a defined, uniform pitch, which is screwed into the threaded hole. (In hydraulic devices, screw parts, in particular nozzle bodies, are generally adhesively bonded in place, in order to prevent them from becoming detached. Adhesive bonding has certain drawbacks, since the screw threads have to be free of grease, and in the case of nozzles there is a risk of blockages, adhesive can enter the hydraulic circuit and also process reliability is not ensured during application.) There is provided a slight difference between the pitch of the internal screw thread of the nut part and the pitch of the external screw thread of the screw part. This slight difference in pitch while the screw part is being screwed in leads to an elastic deformation of a plurality of thread turns, with the result that the screw part is secured so that it cannot become detached.