CN106536915B - High-voltage connection device - Google Patents
High-voltage connection device Download PDFInfo
- Publication number
- CN106536915B CN106536915B CN201580039640.6A CN201580039640A CN106536915B CN 106536915 B CN106536915 B CN 106536915B CN 201580039640 A CN201580039640 A CN 201580039640A CN 106536915 B CN106536915 B CN 106536915B
- Authority
- CN
- China
- Prior art keywords
- pressure connection
- flank
- pressure
- range
- receiving bore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 239000000853 adhesive Substances 0.000 description 12
- 230000001070 adhesive effect Effects 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 greases Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
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
Abstract
The invention relates to a high-pressure connection having a housing (1) in which a receiving bore (2) is arranged, into which a channel (3) extending in the housing (1) extends, a pressure connection piece (9) in which a high-pressure channel (11) extending at one end into an end face (13) of the pressure connection piece (9) is formed, and an external thread (10) formed on the pressure connection piece, which engages with an internal thread (5) formed in the receiving bore (2) in the form of a threaded connection, such that the pressure connection piece (9) rests with a sealing surface (15) formed on the end face (13) on a seat surface (4) of the receiving bore (2) when screwed into the receiving bore (2).
Description
Technical Field
The invention relates to a high-pressure connection having a housing, in which a receiving bore is arranged, into which a channel extending in the housing projects, a pressure connection pipe, in which a high-pressure channel projecting at one end into the end face of the pressure connection pipe is formed, and an external thread formed on the pressure connection pipe, which, when forming a threaded connection, engages with an internal thread formed in the receiving bore, so that the pressure connection pipe, when screwed into the receiving bore with a sealing surface formed on the end face, rests against a seat surface of the receiving bore.
Background
Such a high-voltage connection is known from DE 10125439 a 1. The high-pressure connection is arranged on an injector body of a fuel injection system for an internal combustion engine and also has a pressure connection pipe which can be screwed to the injector body. The high-pressure pipeline can be screwed on the pressure pipe connecting pipe. The internal thread of the injector body and the external thread of the pressure connection piece are designed as a buttress thread. In addition, a securing bolt is provided which engages with a threaded connection formed by an internal thread and an external thread and ensures that the pressure connection is locked in a rotational movement relative to the injector body.
Disclosure of Invention
The object of the present invention is to provide a high-pressure connection with an increased release torque in relation to the prior art with a simple construction.
This object is achieved in that at least one flank of the threaded connection has two flank angles β, γ which differ from one another, it has been found that in a threaded connection in which at least one flank has two or more flank angles β, γ which differ from one another, the loosening torque is significantly increased in comparison with a flank, for example, a threaded connection constructed as a symmetrical 60 ° flank.
The viscosity of the adhesive or of the adhesive charge, which in turn depends on the temperature and is possibly also influenced by external conditions during storage and transport of the adhesive,
wetting of the pitch of the threaded connection, of the surface properties of the threaded part to be wetted by means of the adhesive, of residues, traces or residues of all types of media, such as oils, greases, coolants, lubricants, detergents or preservatives, which may also be present on the surface.
Other characteristics of the binder charge, such as surface tension, storage time, ageing and other characteristics.
These effects, which cannot be completely controlled, may result in either too little or too much adhesive being applied to the threads during the manufacturing or assembly process. These are particularly the case: too little or too much adhesive is applied to all of the pitch of the threads.
Too little adhesive results in that the screw connection is not reinforced in the intended manner and the loosening torque of the screw connection is too low to be allowed. A further possible consequence is an unsealed threaded connection, as a result of which media under high pressure can escape. This is particularly dangerous because it is not possible to check the excessively low loosening torque occurring in this way without loosening after the adhesive has hardened and thereby destroying the threaded connection.
Too much adhesive results in that not all adhesive will be located in the gap of the threaded connection and a part of the adhesive will flow out on the end of the threaded connection. This adhesive which does not allow flow-off must be removed at great expense or may enter the channels or high-pressure channels internally and lead to blockages in the worst case.
The use of the securing pins described in the prior art can only be used with great effort in terms of design and production technology.
In contrast, the threaded connection according to the invention can be disassembled without damage, i.e., the pressure connection can be screwed out of the receiving bore with the application of an increased loosening torque (without adverse consequences). With the threaded connection according to the invention, a multiplicity of remountability of the pressure connection piece to the housing can be achieved. As a result, costs, components and materials are thereby saved.
In one embodiment of the invention, the flank has two partial flanks which enclose an angle γ <180 °. Such an angle γ <180 ° has proven to be particularly advantageous.
In a further embodiment of the invention, the flanks with the two flank angles β, γ are arranged on the internal thread of the housing, which has the advantage that during the machining of the housing which is machined as specified, flanks with the two flank angles β, γ can be produced without problems, while existing batches of parts can be used for the pressure connection pipe to be screwed in.
In a further embodiment of the invention, the flanks with the two flank angles β, γ are the outer flanks pointing away from the seat surface.
In a further embodiment of the invention, the flank angle β (outer flank) is in the range between 30 ° and 80 °, preferably between 40 ° and 70 °, particularly preferably between 45 ° and 65 °.
In a further embodiment, the flank angle γ (outer flank) is in the range between 130 ° and 170 °, preferably in the range between 135 ° and 165 °, particularly preferably in the range between 145 ° and 155 °. On the one hand, this configuration has proven to be able to be processed without problems, and on the other hand, it ensures the desired increase in the release torque.
In a further embodiment of the invention, the flank angle α of the internal flanks opposite the external flanks is in the range between 30 ° and 80 °, preferably between 40 ° and 70 °, particularly preferably between 45 ° and 65 °.
Meanwhile, the dimensional ratio of the lengths of the partial flanks x and y constituted by the flank angle γ is between 1/4 and 4, preferably between 1/2 and 2, particularly preferably (1:2) ± 0.2.
In a further embodiment of the invention, the housing is an injector body. Even if the subject matter of the invention can be implemented in any high-pressure connection, a preferred application in the injector body of an injection system of an internal combustion engine is given. The injector body has a receiving bore as described, to which the pressure connection piece is screwed. The pressure line connection piece has a second threaded flange opposite the threaded flange that is screwed to the injector body, to which second threaded flange the threaded connection of the high-pressure line is screwed. When the threaded connection is released, it must be ensured that the pressure connection piece cannot be screwed out of the receiving bore of the injector body. This is reliably achieved by the configuration according to the invention in that: with this configuration, the loosening torque is increased by approximately a factor of 2 with respect to a threaded connection with a high-pressure line.
Drawings
Further advantageous configurations of the invention can be taken from the description of the figures, in which the embodiments of the invention shown in the figures are further described.
The figures show:
figure 1 is a longitudinal section through a high-voltage connection,
FIG. 2 is an enlarged cross-sectional view of FIG. 1
Figure 3 is a detailed view of a threaded connection constructed in accordance with the present invention.
Detailed Description
Fig. 1 shows an exemplary embodiment of a high-pressure connection according to the invention, a housing 1 designed as an injector body has a receiving bore 2 into which a high-pressure duct 3 extending in the housing 1 projects, the housing 1 preferably being an injector body as part of a fuel injection system for an internal combustion engine, wherein the injector body is used for injecting fuel into an associated combustion chamber of the internal combustion engine, the receiving bore 2 is of cylindrical design, wherein a base surface of the receiving bore 2 is designed as a seat surface 4, the high-pressure duct 3 in the housing 1 projects centrally into the seat surface 4 in such a way that it has a ring-disk shape, an internal thread 5 is designed on an outer circumferential flank surface of the receiving bore 2, which internal thread has an internal flank surface 6 pointing in the direction of the seat surface 4 and an external flank surface 7 pointing away from the seat surface 4 (see fig. 2 and 3), the external flank surface 7 has two partial flank surfaces 8a, 8b (see fig. 3) with two mutually different flank angles β, γ, which configuration will also be described in more detail below.
A pressure connection piece 9, which is at least approximately cylindrical in its end region facing the receiving bore 2 and has an external thread 10 in this region that engages with the internal thread 5 of the receiving bore 2, is screwed into the receiving bore 2. The external thread 10 is configured as a conventional thread with, for example, two symmetrical 60 ° flanks. Pressure connection 9 has a continuous high-pressure channel 11, which connects a high-pressure connection 12, which is present in the end region of pressure connection 9, to an end face 13 of pressure connection 9 facing housing 1. The high-pressure connection 12 is connected here, for example, via a high-pressure line to a high-pressure fuel storage device or a high-pressure fuel source.
Fig. 2 shows an enlarged sectional view of the end region of pressure connection tube 9 facing housing 1. On the end face 13 of the pressure connection piece 9, a circumferential annular web 14 is formed, which surrounds the opening of the high-pressure channel 11 on the end face 13. A sealing surface 15 is formed on the annular web 14, which surface abuts against the seat surface 4 of the receiving bore 2 when the pressure connection piece 9 is screwed in. The sealing surface 15 is pressed into the seat surface 4 by the screwing tension of the pressure connection tube 9, so that the high-pressure channel 11 is connected in a sealing manner to the channel 3.
Fig. 3 shows a detail view of a threaded connection according to the invention with five thread turns with the total axial force distributed to the individual thread turns, wherein the individual thread turns receive between 17% (left) and 24% (right) of the axial force.
This tight distribution or the small difference between the minimum and maximum values results in that the threaded connection according to the invention can be designed towards the load limit and can receive more axial forces than a threaded connection of the same dimensions corresponding to the prior art. The force vector is schematically shown in the force diagram on the right (24%). Short vector FRAD-60°Forces are depicted in the radial direction (acting upwards in the drawing) which can be received by a threaded connection having two symmetrical 60 ° flanks (corresponding to the lower shaded thread in fig. 3).
Long vector FRAD-30°Forces in the radial direction (acting upwards in the drawing) are described, which the threaded connection according to the invention with two flank angles can receive.
In the axial direction FAXI-30°And FAXI-60°Under the same premise:
different radial forces FRAD-60°And FRAD-30°Causing different normal forces FN-60°And FN-30°. This results in the magnitude, i.e. the vector length in the case of 30 ° according to the invention, being almost the vector FN-60°Twice the magnitude of (c). Vector FN-60°And FRAD-30°Represents the difference between the normal forces that each threaded connection is able to receive. To loosenOpening the corresponding threaded connections requires a loosening moment in the normal direction against these forces, respectively. Overall, therefore, to loosen a threaded connection constructed according to the invention, the loosening torque required is almost twice as great as in the case of a threaded connection having two symmetrical flanks of 60 ° corresponding to the prior art.
The enlarged sectional view according to fig. 3 shows an external thread 10 of pressure connecting piece 9 with symmetrical 60 ° flanks, internal flanks 6 of external thread 10 likewise have flanks with a particularly preferred angle α of 60 ° ± 5 °, opposing external flanks 7 of internal thread 5 are divided into two partial flanks 8a, 8b, the dimensional ratio of which is particularly preferably (1:2) ± 0.2, partial flanks 8a, 8b enclose an angle γ of particularly preferably 150 ° ± 5 °, and angle β of partial flanks 8a particularly preferably has an angle β of 60 ° ± 5 °.
The two partial flanks 8a, 8b with different angular influences can each be embodied as shown on the internal thread 5 or also on the external thread 10. Preferably, the two partial flanks 8a, 8b are arranged on the flank which is loaded the most in the tightened state. In a further embodiment according to the lower part of fig. 3, the upper thread (without shading) is therefore embodied as a pressure pipe thread (bolt thread) and the lower thread (with shading) is embodied as an internal thread (nut thread). In a further embodiment according to the lower part of fig. 3, the upper thread (without shading) is embodied as an internal thread (nut thread) and the lower thread (with shading) is embodied as a pressure pipe thread (bolt thread).
Claims (11)
1. A high-pressure connection device having a housing (1), in which a receiving bore (2) is arranged, into which a channel (3) extending in the housing (1) extends, a pressure connection piece (9), in which a high-pressure channel (11) extending at one end into an end face (13) of the pressure connection piece (9) is formed, and an external thread (10) formed on the pressure connection piece, which external thread, in the form of a threaded connection, engages with an internal thread (5) formed in the receiving bore (2), wherein the pressure connection piece (9), when screwed into the receiving bore (2), rests with a sealing surface (15) formed on the end face (13) on a seating surface (4) of the receiving bore (2),
characterized in that at least one flank on the internal thread (5) of the threaded connection has two partial flanks (8a, 8b) which enclose an angle γ <180 ° and two mutually different flank angles β, γ, wherein the flank having the two partial flanks (8a, 8b) is an external flank (7) which points away from the abutment face (4).
2. A high-pressure connection according to claim 1, characterized in that the flank angle β is in the range between 30 ° and 80 °.
3. A high-pressure connection according to claim 1 or 2, characterized in that the flank angle γ is in the range between 130 ° and 170 °.
4. A high-pressure connection according to claim 1 or 2, characterized in that the flank angle α of the internal flank (6) opposite the external flank (7) lies in the range between 30 ° and 80 °.
5. A high-pressure connection according to claim 1 or 2, characterized in that the housing (1) is an injector body.
6. A high-pressure connection according to claim 2, characterized in that the flank angle β is in the range between 40 ° and 70 °.
7. A high-pressure connection according to claim 2, characterized in that the flank angle β is in the range between 45 ° and 65 °.
8. A high-pressure connection according to claim 3, characterized in that the flank angle γ is in the range between 135 ° and 165 °.
9. A high-pressure connection according to claim 3, characterized in that the flank angle γ is in the range between 145 ° and 155 °.
10. A high-pressure connection according to claim 4, characterized in that the flank angle α is in the range between 40 ° and 70 °.
11. A high-pressure connection according to claim 4, characterized in that the flank angle α is in the range between 45 ° and 65 °.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014214110.9A DE102014214110A1 (en) | 2014-07-21 | 2014-07-21 | High-pressure connection device |
| DE102014214110.9 | 2014-07-21 | ||
| PCT/EP2015/065351 WO2016012224A1 (en) | 2014-07-21 | 2015-07-06 | High-pressure connection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106536915A CN106536915A (en) | 2017-03-22 |
| CN106536915B true CN106536915B (en) | 2020-03-20 |
Family
ID=53539699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580039640.6A Expired - Fee Related CN106536915B (en) | 2014-07-21 | 2015-07-06 | High-voltage connection device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3172427A1 (en) |
| CN (1) | CN106536915B (en) |
| DE (1) | DE102014214110A1 (en) |
| WO (1) | WO2016012224A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10920817B2 (en) | 2016-04-29 | 2021-02-16 | Infastech Intellectual Properties Pte. Ltd. | Anti-vibration thread form |
| DE102017220675A1 (en) | 2017-11-20 | 2019-05-23 | Robert Bosch Gmbh | Device for connecting a high-pressure line to a fuel injector, fuel injector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4171012A (en) * | 1975-11-25 | 1979-10-16 | Holmes Horace D | Locking thread construction |
| GB2148439A (en) * | 1983-10-19 | 1985-05-30 | Vetco Offshore Ind Inc | Pipe connector |
| US4983084A (en) * | 1989-09-26 | 1991-01-08 | Northrop Corporation | Double locked threaded fastener |
| DE102012100976A1 (en) * | 2012-02-07 | 2013-08-08 | Franz Haimer Maschinenbau Kg | Screwing tool and tool holder for such a screw-in |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5931511A (en) * | 1997-05-02 | 1999-08-03 | Grant Prideco, Inc. | Threaded connection for enhanced fatigue resistance |
| DE10125439A1 (en) | 2001-05-25 | 2002-11-28 | Bosch Gmbh Robert | High pressure connecting device comprises two breech block threads having thread flanks formed perpendicular to the longitudinal axis of the internal thread and lying against each other in a force-locking manner |
-
2014
- 2014-07-21 DE DE102014214110.9A patent/DE102014214110A1/en not_active Withdrawn
-
2015
- 2015-07-06 WO PCT/EP2015/065351 patent/WO2016012224A1/en active Application Filing
- 2015-07-06 CN CN201580039640.6A patent/CN106536915B/en not_active Expired - Fee Related
- 2015-07-06 EP EP15735923.3A patent/EP3172427A1/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4171012A (en) * | 1975-11-25 | 1979-10-16 | Holmes Horace D | Locking thread construction |
| GB2148439A (en) * | 1983-10-19 | 1985-05-30 | Vetco Offshore Ind Inc | Pipe connector |
| US4983084A (en) * | 1989-09-26 | 1991-01-08 | Northrop Corporation | Double locked threaded fastener |
| DE102012100976A1 (en) * | 2012-02-07 | 2013-08-08 | Franz Haimer Maschinenbau Kg | Screwing tool and tool holder for such a screw-in |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014214110A1 (en) | 2016-01-21 |
| EP3172427A1 (en) | 2017-05-31 |
| WO2016012224A1 (en) | 2016-01-28 |
| CN106536915A (en) | 2017-03-22 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200320 Termination date: 20210706 |
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| CF01 | Termination of patent right due to non-payment of annual fee |