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
  • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
• • 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

Definitions

• the present invention relates to a device for testing fuel injection valves and related parts thereof.
• the pressures can be very high, even up to 6000 bars.
• a pressure test is applied to the fuel injection valve and its interior parts. A leakage in a fuel injection system causes a serious hazard both due to the high pressure of the fuel and the fire risk.
• the connection block in which the injector and related parts attached can be cracked due to the high stress occurred in the connection portions.
• the present invention relates to a testing device for parts to be tested of a fuel injection valve of an internal combustion engine, comprising: at least one connection block having a plurality of branch holes communicated with each other through a flow passage, said connection block further having an inlet port through which pressure medium enters and an outlet port through which said pressure medium exits; said inlet port and the outlet port in communication with the flow passage; at least one adaptor for holding the part to be tested of the fuel injection valve, said adaptor being arranged to be detachably attached to the branch hole.
• Said testing device further comprises an alignment member for alignment and self-centering the adaptor wherein said alignment member is placed between the connection block and the adaptor so as to transfer the pressure medium from the connection block to the adaptor through an interior passageway.
• Said alignment member substantially improves the connection of the adaptor and the connection block, thus, prevents cracking occurrence for a prolonged period of time.
• the alignment member helps for better alignment of the adaptor within the connection block and ensures a self-centering of the adapt
• the alignment member has a first portion in the form of a frusto-conical arranged to match a hollow taper surface of a connection block.
• the first potion has a taper angle (a) of about between 45° and 70°, preferably 55° and 65°. Thus, less stress concentration between the alignment member and the connection block is obtained.
• the alignment member has a second portion in the form of a frusto-conical arranged to match a corresponding inlet hole of the adaptor. Further, the second portion has a taper angle (a) of about between 45° and 70°, preferably 55° and 65°. Thus, less stress concentration between the alignment member and the adaptor is obtained.
• the first portion has a chamfered end formed on the periphery of the first portion as inclined.
• a lower stress concentration is provided at the chamfered end.
• connection block has four branch holes each in communication with the flow passage for testing more than one part of the fuel injection valve at the same time.
• an induced plastic transformation is generated on the hollow taper surface by autofrettage processing.
• the compression residual stress is decreased.
• the branch hole has at least a portion in the interior surface which is threaded that matches with a corresponding threaded portion of the adaptor.
• the adaptor can thus be safely connected to the connection block.
• FIG. 1 is a perspective view of an adaptor for attaching the fuel injector and related parts to a testing device according to the present invention.
• FIG. 2 is a cross-sectional view of the adaptor shown in FIG. 1
• FIG. 3 is a perspective view of an alignment member arranged to be used within an adaptor according to the present invention.
• FIG. 4 is a cross-sectional view of the alignment member shown in FIG. 3.
• FIG. 5 is a perspective view of a connection block according to the present invention.
• FIG. 6 is a cross-sectional view of the connection block shown in FIG. 5.
• FIG. 7 is a cross-sectional view of a testing device in which an adaptor and an alignment member are attached to a connection block according to the present invention.
• FIG. 8 is a perspective view of a testing device shown in Fig. 7.
• FIG. 9 is a cross-sectional view of a testing device in which an adaptor and an alignment member are attached to a connection block according to the present invention, showing a contact area of the alignment member to the connection block.
• FIG. 10 is a cross-sectional view of a testing device in which an adaptor is attached to a connection block according to the prior art, showing a contact area of the adaptor to the connection block.
• B-Detail shows the contact area of the adaptor to the connection block in detail which is taken from fig.10.
• the present invention proposes a testing device (40) for parts to be tested of a fuel injection valve of an internal combustion engine, comprising: at least one connection block (30) having a plurality of branch holes (32) communicated with each other through a flow passage (39), said connection block (30) further having an inlet port (36) through which pressure medium enters and an outlet port (34) through which said pressure medium exits; said inlet port (36) and the outlet port (34) in communication with the flow passage (39); at least one adaptor (10) for holding a part to be tested of the fuel injection valve, said adaptor (10) being arranged to be detachably attached to the branch hole (32).
• Said testing device (40) further comprises an alignment member (20) for alignment and self-centering the adaptor (10) wherein said alignment member (20) is disposed between the connection block (30) and the adaptor (10).
• the testing device (40) can have a pressure sensor which sense the pressure of the medium that comes from the outlet port (34) of the connection block (30). Further, the testing device (40) may have a pressure supply device, which sends the medium to the connection block (30) from the inlet port (36).
• the connection block (30) has four branch holes (32) each in communication with the flow passage (39) for testing more than one part of the fuel injection valve at the same time.
• connection block (30) can include four fastening holes (33) as shown in Fig. 5.
• Said testing device (40) mainly comprises at least one connection block (30) with a plurality of branch holes (32) into which an adaptor (10) can be attached for holding parts to be tested of a fuel injector.
• the adaptor (10) allows attachment of the fuel injector parts and prevents the said parts from falling out of the connection block (30).
• the adaptor (10) can be used as a nut, which is attached to the connection block (30) by means of threads.
• the alignment member (20) is used for better alignment of the adaptor (10) within the connection block (30) and ensures a self- centering of the adaptor (10).
• the alignment member (20) has a first portion (23) as shown in Fig. 3 which serve for sealing against a hollow taper surface (31) of a branch hole (32) of the connection block (30).
• a sealing area is provided peripherally on the contact area of the alignment member (a) to the hollow taper surface (31) of the branch hole (32), especially sealing area is formed at an end of the first portion (23).
• the first portion (23) and the second portion (24) of the alignment member (20) are situated against the hollow taper surface (31) of the branch hole (32) and a taper inlet port (11) of the adaptor (10), respectively, as shown in FIG. 7.
• the alignment member (20) has a flattened portion (29) at the junction of the first and second portions (23, 24), as shown in Fig. 4.
• a non- autofrettage area is formed on the branch hole (32).
• the first portion (23) has a chamfered end (231) formed on the periphery of the first portion (23) as inclined. Thus, a lower stress concentration is provided at the chamfered end (231).
• the first portion (23) can be formed as a frusto-conical shape that matches the hollow taper surface (31), with a taper angle a of about between 45° and 70°, preferably 60°, as shown in Fig. 6.
• the alignment member (20) further comprises a second portion (24) which bears the taper inlet port (11) of the adaptor (10), when in use.
• the second potion (24) has a taper angle (a) of about between 45° and 70°, preferably 55° and 65°.
• the second portion (24) of the alignment member (20) is preferably in the form of the frusto-conical, which can be same as the first portion (23), which is shaped and dimensioned with respect to the taper inlet port (11) for sealing pressing the alignment member (20) against the connection block (30).
• the adaptor (10) comprises a first portion (13) and a second portion (14) with, preferably, screw threads formed on the outer surfaces thereof.
• the first portion of the adaptor (13) being arranged to be at least partly inserted into the branch hole (32) and the second portion of the adaptor (13) is arranged to hold a part of the fuel injection valve to be tested.
• the adaptor (10) can be screwed on to a male screw thread on the connection block (30) in the usual manner. Further, the adaptor (10) could also be a plate or a block or a similar part, which is attached to the connection block (30).
• the branch hole (32) has at least a portion in the interior surface which is threaded that matches with a corresponding threaded portion of the adaptor (10).
• the adaptor (10) has an inner channel (12) as a through hole which is in communication with the flow passage (39) of the connection block (30) through the interior passageway (22) of the alignment member (20) in which high pressure medium axially flows.
• Said interior passageway (22) of the alignment member (20) is formed as a channel with an inlet and outlet ports having chamfered entrance portions.
• the adaptor (10) is used without any alignment means that causes high stress on the connection block (30).
• the adaptor (10) is adapted to the connection block (30) with a 50-60 Nm torque in the prior art.
• the non- autofrettage area is the hollow taper surface (31).
• the hollow taper surface (31) has low strength, which is not exposed to high pressure during test by changing the sealing position according to the prior art.
• the sealing is provided away from the flow passage (39) in the prior art but in the present invention, the sealing is provided very close to the flow passage (39).
• connection block (30) At the branch holes (32) of the connection block (30) an induced plastic transformation can be generated on the hollow taper surface (31) by autofrettage processing, and the compression residual stress is decreased.
• the part to be tested shows excellent internal pressure fatigue resisting characteristic.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=64277664

Family Applications (1)

Country Status (3)

Family Cites Families (4)

• 2017
  • 2017-11-24 TR TR2017/18697A patent/TR201718697A2/tr unknown
• 2018
  • 2018-11-07 EP EP18800892.4A patent/EP3714155A1/en not_active Withdrawn
  • 2018-11-07 WO PCT/EP2018/080432 patent/WO2019101519A1/en unknown

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