Method for making a through opening in a high-pressure fuel reservoir, and apparatus for performing the method

• US 6,684,480 B2
• Filed: 01/04/2002
• Issued: 02/03/2004
• Est. Priority Date: 01/15/2000
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Conrad, Wolf-Ruediger
• Primary Examiner(s): Vidovich, Gregory
• Assistant Examiner(s): Kenny, Stephen
• Application Number:
  US09/936,617
• Publication Number:
  US 20020157231A1
• Time in Patent Office: 760 Days
• Field of Search: 295/58, 295/57, 298/880.1, 298/880.11, 298/884, 298/884.3, 298/901.2, 298/901.22, 298/901.32, 409/143, 408/1.R, 408/87, 408/79, 279/241.R, 279/87
• US Class Current: 29/558
• CPC Class Codes: F02M 2200/40 Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
• CPC Class Codes: F02M 55/025 Common rails
• CPC Class Codes: F16L 41/04 Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor
• CPC Class Codes: Y10T 29/49231 I.C. [internal combustion] engine making
• CPC Class Codes: Y10T 29/49405 Valve or choke making
• CPC Class Codes: Y10T 29/49812 Temporary protective coating, impregnation, or cast layer
• CPC Class Codes: Y10T 29/49996 Successive distinct removal operations
• CPC Class Codes: Y10T 408/03 Processes
• CPC Class Codes: Y10T 408/34 Combined cutting means
• CPC Class Codes: Y10T 408/557 Frictionally engaging sides of opening in work
• CPC Class Codes: Y10T 408/561 Having tool-opposing, work-engaging surface

Abstract

A method for making a through opening in a high-pressure fuel reservoir that has an elongated, tubular jacket body, which body is provided in the longitudinal direction with a continuous recess, open on at least one end, that forms the interior of the high-pressure fuel reservoir, and the through opening is made in the jacket body in the form of a bore by a machining tool in such a way that this opening discharges into the continuous recess. In order to avoid burrs, before the through opening is made, a pressure part is pressed against the inner wall of the jacket body in the region of the expected outlet of the through opening, and with the machine an tool, drilling is done through the jacket body some distance into the pressure part.

Claims

1. A method for making a through opening in a high-pressure fuel reservoir that has an elongated, tubular jacket body (1), which body is provided in the longitudinal direction with a continuous recess (2), open on at least one side, that forms the interior of the high-pressure fuel reservoir, and the through opening (5) is made in the jacket body (1) in the form of a bore by a machining tool in such a way that this opening discharges into the continuous recess (2), the method comprising the steps of pressing a pressure part (13) against the inner wall (4) of the jacket body (1) in the region of the expected outlet of the through opening (5) before the through opening is made, then with the machine tool, drilling through the jacket body (1) some distance into the pressure part (13).

2. The method of claim 1, further comprising the step of rounding off or chamfering the encompassing edge (7) formed by the through opening (5) and the inner wall (4) of the continuous recess (2) after the through opening is made.

3. The method of claim 1, further comprising a chucking device (10, 11, 12, 13) that can be introduced into the continuous recess (2) by a first chucking jaw (10) having an interchangeable pressure part (13) and a second chucking jaw (11) and a chucking part (12) disposed between the first chucking jaw (10) and the second chucking jaw (11), by which chucking part the pressure part (13) and the second chucking jaw (11) can be pressed into contact with the inner wall (4) of the continuous recess (2).

4. The method of claim 3, wherein said pressure part (13) can be used as an insertion part into a recess (6) of the first chucking jaw (10).

5. The method of claim 3, wherein said pressure part (13) comprises metal or a very hard plastic.

6. The method of claim 3, wherein the radius of curvature of the face (14) of the pressure part (13) oriented toward the inner wall (4) of the continuous recess (2) is adapted precisely, at the point intended for making the through opening (5), to the radius of curvature of the inner wall (4) of the continuous recess (2).

7. The method of claim 2, further comprising a laser beam for rounding off an encompassing edge (7) formed at the intersection of the through opening (5) and an inner wall (4) of the continuous recess (2), said laser beam (20) being supported to shine axially into the applicable bore and being displaceable perpendicular to the axis of the bore, and a rotating deflection mirror (22) inclined relative to the laser beam (20), said mirror being mounted on a slide (21) that is provided with an annular gear (25) and can be introduced into the continuous recess (2).

8. The method of claim 2, further comprising a grinding device (30) provided for chamfering an encompassing edge (7) formed at the intersection of the through opening (5) and an inner wall (4) of the continuous recess (2), said grinding device having a conical grinding head (31) that can be introduced into the continuous recess.

9. The method of claim 8, wherein said grinding device (30) is disposed on a rod (33), and that the motion of the grinding head (31) in the continuous recess (2) is controllable in such a way, by a drive unit acting on the rod (33), that the grinding head (31) is moved along the edge contour (7) in accordance with a preset program.

10. The method of claim 9, wherein said grinding head (31) protrudes from the grinding device (30) approximately perpendicular to the rod (33) and is supported axially movably on the grinding device counter to the tensing force of a spring (34).