Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
  • F02M55/004—Joints; Sealings
  • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B39/00—Locking of screws, bolts or nuts
  • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
  • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
  • F16B39/30—Locking exclusively by special shape of the screw-thread

Definitions

• the invention relates to a high-pressure connection device with a housing in which a receiving opening is arranged, into which a channel extending in the housing opens, and with a pressure pipe socket, in which a
• High-pressure channel is formed, which opens at one end into an end face of the pressure pipe nozzle, and with a pressure on the pressure pipe socket
• Pressure pipe socket comes when screwing into the receiving opening with a formed on the end face sealing surface on a seat surface of the receiving opening to the plant.
• Such a high-pressure connection device is known from DE 101 25 439 AI.
• This high-pressure connection device is arranged on an injector body of a fuel injection system for an internal combustion engine and further has a pressure pipe socket which can be screwed to the injector body.
• a high-pressure line can in turn be screwed to the pressure pipe socket.
• the internal thread of the injector and the external thread of the pressure pipe socket is formed with a SAge leopardgewinde.
• an engaging in the screw thread formed by the internal thread and the external thread locking pin is provided, which ensures that the
• the invention has for its object to provide a high-pressure connection device, which has a relation to the prior art increased release torque in a simple structure.
• Screwing two mutually different flank angle ß, ⁇ has. It has been found that in a screw connection in which at least one flank has two or more mutually different flank angles ⁇ , ⁇ , the release torque is significantly increased compared to a screw connection whose flanks are designed, for example, as symmetrical 60 ° flanks. This makes it possible, for example, to dispense with the use of an adhesive which is added during the screwing of the pressure pipe socket into the receiving opening in the screw to increase the release torque. Indeed, in the practice of screwing using an adhesive, it has been found that the amount of adhesive actually present in the thread depends on a number of factors which are inaccessible to control. These are: the viscosity of the adhesive or the adhesive charge, which in turn is temperature-dependent and may also be influenced by external conditions during storage and transport of the adhesive charge, the wetting of the threads of the screw, the
• Manufacturing process or assembly process cause either too little adhesive or too much adhesive is applied to the thread. In particular, cases occur in which too little or too much adhesive is applied to all threads of the thread.
• Too little adhesive has the consequence that the screw is not reinforced in a planned manner, and the release torque of this screw is inadmissible low. Another possible consequence is a leaky one
• Gaps of the screwing takes place and a part of the adhesive emerges at the end of the screw connection. This inadmissibly escaping adhesive must be removed consuming or inside the channel or the
• Locking pin is only constructive and expensive to apply manufacturing technology.
• the fitting according to the invention can be dismantled non-destructively, i. the pressure pipe socket can with the application of an increased release torque - otherwise but without adverse consequences - from the receiving opening
• the flank has two partial flanks which enclose an angle ⁇ ⁇ 180 °. Such an angle ⁇ ⁇ 180 ° has proven to be particularly advantageous.
• the flank is arranged with two flank angles ß, ⁇ on the internal thread of the housing. This arrangement has the advantage that the flank with the two flank angles ß, ⁇ can be easily manufactured during the manufacture of the housing, which is manufactured according to individual specifications, while an existing series part can be used for the pressure pipe socket to be screwed.
• flank angle ß (the
• Outside edge in a range between 30 ° and 80 °, preferably between 40 ° and 70 °, more preferably between 45 ° and 65 °.
• the flank angle ⁇ (the outer edge) is in a range between 130 ° and 170 °, preferably between 135 ° and 165 °, more preferably between 145 ° and 155 °.
• this embodiment has proven to be easily manufacturable, but on the other hand, this embodiment ensures the desired increase in the release torque.
• a flank angle ⁇ of the inner flank opposite the outer flank lies in a range between 30 ° and 80 °, preferably between 40 ° and 70 °, particularly preferably between 45 ° and 65 °.
• Flank angle ⁇ formed partial flanks x to y between% and 4, preferably between 14 and 2, particularly preferably (1: 2) +/- 0.2.
• the housing is an injector body.
• High pressure connection device can be realized, is the preferred Application to an injector body of an injection system
• the injector body has the specified
• the pressure pipe socket has, opposite to the threaded flange bolted to the injector body, a second threaded flange onto which a screw connection of a high-pressure line is screwed.
• FIG. 1 shows a longitudinal section through a high-pressure connection device
• Figure 2 is a detail enlargement II of Figure 1 and
• FIG. 3 is a detail view of the invention formed
• Figure 1 shows an embodiment of an inventive
• a housing 1 designed as an injector body has a receiving opening 2 into which a high-pressure passage 3 extending in the housing 1 opens.
• the housing 1 is preferably an injector body as part of a fuel injection system for internal combustion engines, wherein the injector body is used to inject fuel into an associated combustion chamber of the internal combustion engine.
• the receiving opening 2 is cylindrical, wherein the base of the receiving opening 2 is formed as a seat surface 4.
• the high-pressure passage 3 in the housing 1 in this case opens centrally into the seat surface 4, so that it has an annular disk-shaped form.
• an internal thread 5 is formed, which has a facing the seat surface 4 inner edge 6 and a direction away from the seat surface 4 outer edge 7 (see Figure 2 and 3).
• the outer flank 7 has two partial flanks 8a, 8b (see FIG. 3), which are two to one another
• flank angles ß, ⁇ have different flank angles ß, ⁇ . This embodiment will be described in detail below.
• a pressure pipe socket 9 is screwed, which at its end facing the receiving opening 2 at least
• the external thread 10 is as conventional thread with
• Pressure pipe socket 9 has a continuous high-pressure channel 11, which is located in an end region of the pressure pipe socket 9
• High-pressure connection 12 with the housing 1 facing end face 13 of the pressure pipe connecting piece 9 connects.
• the high pressure port 12 is included
• FIG. 2 shows an enlarged detail II of the end region of the pressure pipe connecting piece 9 facing the housing 1
• Mouth of the high-pressure passage 11 surrounds the end face 13.
• a sealing surface 15 is formed, which comes with screwed pressure pipe socket 9 on the seat surface 4 of the receiving opening 2 to the plant.
• Figure 3 shows a detailed view of the fitting according to the invention with a distribution of the total axial forces on the individual turns in the case of five turns, the individual turns between 17% (left) and 24% (right) absorb the axial forces.
• This narrow distribution or the small difference between the minimum value and maximum value has the consequence that the fitting according to the invention can be designed to the load limits and can absorb more axial forces, as a screw connection of the same dimensions corresponding to the prior art.
• the force vectors are shown schematically.
• the short vector F RA D-60 ° describes the forces in the radial direction (acting upwards in the drawing), which is capable of accommodating a screw connection with two symmetrical 60 ° flanks (corresponding to the lower hatched thread in FIG. 3).
• the long vector F RA D-3O ° describes the forces in the radial direction (acting upwards in the drawing), which is able to receive the screw connection according to the invention with a second flank angle. Assuming equal axial forces F A xi-3o ° and F A xi-6o °, the following applies:
• FIG. 3 shows the external thread 10 of the pressure pipe connecting piece 9 having the symmetrical 60 ° flanks
• Inner edge 6 of the external thread 10 also has an edge with a particularly preferred angle ⁇ of 60 ° +/- 5 °.
• the opposite outer flank 7 of the internal thread 5 is subdivided into the two partial surfaces 8a, 8b whose dimension ratio is particularly preferably between (1: 2) +/- 0.2.
• the partial surfaces 8a, 8b include the angle ⁇ , which is particularly preferably 150 ° +/- 5 °, while the angle ß of the partial surface 8a has an angle ß of particularly preferably 60 ° +/- 5 °.
• the two partial edges 8a, 8b with the different angle impact can each - as shown - on the internal thread 5 or also on the
• the two partial edges 8a, 8b are arranged on the most heavily loaded flanks in the screwed state. Consequently, in an unillustrated embodiment according to FIG. 3, lower part, the upper thread (without hatching) can be designed as a pressure pipe thread (bolt thread) and the lower thread (with hatching) as an inner thread (nut thread). In a further embodiment according to FIG. 3 lower part, the upper thread (without hatching) can be formed as an internal thread (female thread) and the lower thread (with hatching) as a pressure pipe thread (bolt thread).

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)
• Joints With Pressure Members (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=53539699

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (1)

Citations (4)

Family Cites Families (2)

• 2014
  • 2014-07-21 DE DE102014214110.9A patent/DE102014214110A1/de not_active Withdrawn
• 2015
  • 2015-07-06 WO PCT/EP2015/065351 patent/WO2016012224A1/de active Application Filing
  • 2015-07-06 EP EP15735923.3A patent/EP3172427A1/de not_active Withdrawn
  • 2015-07-06 CN CN201580039640.6A patent/CN106536915B/zh not_active Expired - Fee Related

Patent Citations (4)

Non-Patent Citations (1)

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