Sensor, in particular RPM sensor

US5254807A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Werner Pfander · Fellbach, DE
• Kristian Leo · Burgstetten, DE
• Klaus Heyer · Freiberg, DE
• Uwe Kohler · Kelkheim, DE
• Hans-Jurgen Herderich · Weingarten, DE

Key dates

• Filing date: Mar 16, 1992
• Grant date: Oct 19, 1993
• Expiry date: Mar 16, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B3/06
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An RPM sensor for anti-lock and/or traction control systems of motor vehicles or for engine speed governing or gasoline or Diesel injection control. The RPM sensor has a housing, receiving electrical components, with a first housing part of plastic that is at least partly enveloped by a second housing part, produced in an injection molding process, likewise from plastic. To attain a moisture-proof, material bond between the two housing parts, a melting element of a plastic having a lower melting point than that of the plastic of the housing parts is disposed in a contact zone between the two housing parts. When the second housing part is formed, the melting element is heated above its melting point, and a material bond of the two housing parts is attained which protects the RPM sensor against moisture dirt, stress, etc.