Sealing unit for a fuel pressure sensor

• US 6,070,883 A
• Filed: 06/25/1997
• Issued: 06/06/2000
• Est. Priority Date: 12/21/1995
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Marto, Heinz-Arno
• Primary Examiner(s): Knight, Anthony
• Assistant Examiner(s): PEAVEY, ENOCH E
• Application Number:
  US08/860,375
• Time in Patent Office: 1,077 Days
• Field of Search: 277/587, 277/630, 277/637, 277/641, 277/609, 277/616, 277/939, 73/756, 73/726, 73/727, 73/724, 285/353, 285/347, 285/917, 285/379
• US Class Current: 277/609
• CPC Class Codes: G01L 23/26 Details or accessories
• CPC Class Codes: Y10S 285/917 Metallic seals

Abstract

The invention relates to a sealing unit for a fuel pressure sensor for sealing an at least virtually flat sealing joint between the sensor and a component that carries it via a screw connection, wherein a round sealing washer with a central bore is disposed between the threaded bolt-shaped end of the sensor housing with its central sensor bore and the bottom of the threaded bore of the component with its central pressure fluid opening. A pin is formed onto the threaded bolt-shaped end of the sensor housing, which pin centers the sealing washer, fixing it in a positive and/or frictional, non-positive manner, and rises above an end face that serves as a bearing surface for the sealing washer. The pin ends in an end face and has a length that is shorter than the thickness of the sealing washer. A sealing unit is produced that assures a reliable sealing function and permits a simple installation and disassembly of the sealing washer while reclaiming the sealing washer in a sealing position.

Claims

1. A sealing unit in combination with an end of a fuel pressure sensor housing, said fuel pressure sensor housing being secured to a fluid pressure carrying component which includes a central pressure fluid opening, said sensor housing includes a central unobstructed sensor bore (29) through which fuel flows, screw threads (22) along a bolt threaded end (21), a bearing end section (23) adjoining integral with said bolt threaded end and a centering pin (26) extends from said bearing end section, said bearing end section (23) including an end sealing face (24), said component includes a threaded bore (2) to which the sensor housing is secured via said threaded end (21), said sealing unit comprises a disk-type sealing washer (10) with a control bore, said sealing washer is permanently deformed and disposed on said centering pin between said sealing face (24) of the bearing end section (23) of said sensor housing in engagement with said end sealing face (24) and a bottom of the threaded bore of said component, said centering pin (26, 26'"'"') centers the sealing washer (10) fixing the sealing washer in a positive and frictional manner on said pin, wherein the pin (26, 26'"'"') has an axial length that is shorter than a thickness of the sealing washer (10).

2. The sealing unit according to claim 1, in which an outer contour of the pin (26) is cylindrical.

3. The sealing unit according to claim 1, in which the sealing washer (10) is fixed on the pin (26) by means of a lateral press fit.

4. The sealing unit according to claim 1, in which the pin (26'"'"') is embodied in the shape of a truncated cone, wherein the cone diameter in a region of the sensor end sealing face is smaller than at a free end of the pin (26'"'"').