JP2598952Y2 - Pull-up inspection machine for fuel injector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pull-up inspection machine for a fuel injector for inspecting an axial sliding resistance between an injection nozzle of a fuel injector and a needle valve used in, for example, an automobile engine.

[0002]

2. Description of the Related Art FIGS. 10 and 11 show a conventional fuel injector.

In FIG. 1, reference numeral 1 denotes a stepped cylindrical injector main body, 2 denotes a casing constituting the injector main body 1, and the casing 2 is a hollow outer cylindrical portion having a fuel flow opening 3 formed in a radial direction. 2A, a lid 2B formed on the upper end side of the outer cylinder 2A in the axial direction, and a hollow cylindrical core 2C protruding through the center of the lid 2B.
It is composed of

[0004] Reference numeral 4 denotes a stepped cylindrical holder which constitutes the injector main body 1 together with the casing 2.
The upper end is fitted and fixed to the lower end of the casing 2, and a plate stopper 5 for regulating the opening position of a needle valve 8 described later and the injection nozzle 6 are fitted and fixed to the inner periphery of the lower end.

Reference numeral 6 denotes an injection nozzle which is fitted and fixed to the holder 4 with the upper end in the axial direction sandwiching the plate stopper 5 and is formed in a hollow cylindrical shape. A seat 6A and an injection port 6B are formed.

Reference numeral 7 denotes a nozzle plate fixed to the lower end of the injection nozzle 6 so as to cover the injection port 6B, and a plurality of injection holes 7A, 7A, 7A, ... (only two of them are shown).

Reference numeral 8 denotes a needle valve provided in the injection nozzle 6 so as to be slidable in the axial direction.
A, a large-diameter portion 8B formed on the upper end side of the valve shaft 8A and attached to an anchor 9 described below, and formed below the large-diameter portion 8B and spaced apart by a predetermined dimension in the axial direction. And a valve portion 8D formed at the lower end of the valve shaft 8A and detachably seated on the valve seat 6A of the injection nozzle 6.

An anchor 9 is located opposite the end face of the core 2C of the casing 2 and is fixed to the large diameter portion 8B of the needle valve 8 by welding or the like. An adjusting rod as a spring receiving member inserted in the adjusting rod 10 and an anchor 9 are shown.
A valve spring 11 for constantly urging the needle valve 8 in the valve closing direction is provided between them.

Reference numeral 12 denotes a solenoid fitted between the outer cylinder portion 2A and the core portion 2C of the casing 2. The solenoid 12 is excited when an injection signal is inputted via the terminal pin 13, whereby the solenoid is excited. This is to suck the anchor 9 against the spring force of the valve spring 11 and open the needle valve 8.

Reference numeral 14 denotes a protector provided outside the nozzle plate 7, 15 a connector provided outside the lid 2 B of the casing 2, and 16 a cover outside the casing 2 so as to cover the fuel flow opening 3. This is a filter fitted to the cylindrical portion 2A.

The fuel injector according to the prior art has the above-described configuration, and a needle valve 8 is assembled to an injection nozzle 6 to form a valve assembly. A valve assembly including the injection nozzle 6 and the needle valve 8 is connected to a solenoid. The injector main body 1 is formed by caulking and fixing to the lower end side of the outer cylindrical portion 2A of the casing 2 to which 12 and the like are attached. Then, the terminal pins 13 are attached to the injector main body 1 and resin-molded to form a connector 15, thereby manufacturing the injector.

Next, the operation of the fuel injector thus manufactured will be described.

First, the fuel delivered from the fuel pump is supplied into the casing 2 through a fuel pipe (not shown), a filter 16 and a fuel flow port 3, and flows through the outer peripheral side of the anchor 9 and the inside of the plate stopper 5. After that, it flows between the injection nozzle 6 and the needle valve 8.

An injection signal from a control unit (not shown) is supplied to the solenoid 12 through a terminal pin 13.
Is applied, the solenoid 12 is excited and attracts the needle valve 8 together with the anchor 9 against the spring force of the valve spring 11. As a result, the needle valve 8 moves the injection nozzle 6
The fuel in the injection nozzle 6 is injected from an injection port 6B into an intake manifold (not shown) through each injection hole 7A of a nozzle plate 7.

[0015]

In the fuel injector according to the prior art described above, the needle valve 8 is assembled in the injection nozzle 6, but the inner surface of the injection nozzle 6 and each chamfered portion 8C of the needle valve 8 are connected to each other. Is only 4 to 6 μm, for example, so if the injection nozzle 6 and the needle valve 8 have burrs, flaws, etc., the axial sliding between the injection nozzle 6 and the needle valve 8 is not performed smoothly, Fuel injection characteristics, responsiveness, etc., are significantly reduced.

For this reason, in the prior art, the worker manually assembles the needle valve 8 to the injection nozzle 6 and pulls up the needle valve 8 in the axial direction as shown by the arrow in FIG. By examining the sensation, it is determined whether the sliding resistance in the axial direction is normal or defective with a delicate skin feeling, so the work efficiency of assembly work and inspection work is low, and the manufacturing cost increases significantly There is a problem of doing.

Also, since the sensory test relies on the individual senses of the operator, the inspection standards differ depending on the level of skill, making it difficult to stabilize the quality. In addition, since the inspection process is manual, the entire fuel injector is assembled. There is a problem that work cannot be automated.

The present invention has been made in view of the above-mentioned problems of the prior art, and can automatically inspect the sliding resistance between the injection nozzle and the needle valve in the axial direction, thereby greatly improving the efficiency of the inspection work. An object of the present invention is to provide a pull-in inspection machine for a fuel injector which can be improved.

[0019]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention employs a structure in which a needle valve is mounted on an injection nozzle and a transfer means is provided, and the injection means transferred by the transfer means. Fixing means for fixing the nozzle, pulling means for pulling up the needle valve in the axial direction in a state where the injection nozzle is fixed by the fixing means, and an axial direction applied to the needle valve when the needle valve is pulled up by the pulling means. And an axial torque detecting means for detecting torque.

[0020]

When the injection nozzle to which the needle valve is assembled is transported by the transport means, and the fixing means fixes the injection nozzle, the pulling means pulls up the needle valve from the injection nozzle in the axial direction, and the axial torque detecting means moves. An axial torque applied to the needle valve when the needle valve is pulled up is detected.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those in the prior art shown in FIGS. 10 and 11 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 21 denotes a valve assembly inspection apparatus for inspecting the sliding resistance and the like of a valve assembly comprising the injection nozzle 6 and the needle valve 8 to which the anchor 9 is fixed. Comprises a gantry 22 in which a motor (not shown) and the like are housed, an index table 23 as a transport means rotatably provided on the gantry 22,
An inner diameter inspection machine 26 and a first pull-up inspection machine 3, which will be described later, which are arranged apart from each other in the circumferential direction of the index table 23.
0, a second pulling inspection machine 31, a rotation inspection machine 32, and the like.
, And a plurality of inner pockets 23B, 23B,... Which are located on the inner peripheral side and into which the needle valve 8 is inserted, are spaced apart in the circumferential direction.

A parts feeder 24 supplies the injection nozzles 6 to the outer pockets 23A of the index table 23 via a carry-in machine (not shown). A blower 25 blows air into each of the injection nozzles 6 supplied by the parts feeder 24. The air sprayers 26 and 26 respectively indicate inner diameter inspection machines for inspecting the inner diameter of the injection nozzle 6 blown by the air sprayer 25. The inner diameter inspection machine 26 is composed of, for example, a laser type dimension measuring device or the like. I have. The inner diameter inspection device 26 inspects the inner diameter of each injection nozzle 6 and outputs the result to a control unit 36 described later.

Reference numeral 27 denotes a needle valve supply chute for supplying the needle valve 8 to each of the inner pockets 23B of the index table 23. Reference numeral 28 denotes air blowing by blowing air to the outside of each needle valve 8 supplied by the needle valve supply chute 27. The other air blowing device 29 is an assembling machine that takes out the needle valve 8 cleaned by the air blowing device 28 from each inner pocket 23B, inserts the needle valve 8 into the injection nozzle 6 of each outer pocket 23A, and assembles the same. The assembling machine 29 includes a driving mechanism such as a cylinder and a motor, and a chucking mechanism (both not shown). The needle valve supply chute 27 is supplied with the needle valves 8 which are classified into a plurality of ranks according to the respective outer diameters, and adjusts the inner diameter of the injection nozzle 6 based on the inspection result of the inner diameter inspection machine 26. Needle valve 8 according to
Is selected and supplied.

Reference numerals 30 and 31 denote a first pulling inspection machine and a second
Respectively, and each of the pulling inspection machines 3
Reference numerals 0 and 31 denote the injection valve 6 and the needle valve 8 as described later.
Is pulled out in the vertical direction, and the axial torque applied to the needle valve 8 at that time is output to the control unit 36 as a pulling torque.

Reference numeral 32 denotes a rotation inspection machine provided between the pull-up inspection machines 30 and 31. The rotation inspection machine 32 rotates the injection nozzle 6 while fixing it, as will be described later, thereby rotating the needle valve 8. It detects the torque in the direction and outputs it to the control unit 36.

Numerals 33 and 34 denote a first defective stock chute and a second defective stock chute provided at a position downstream of the second pulling inspection machine 31, respectively. Reference numerals 33 and 34 denote defective injection nozzles 6 determined by the inner diameter inspection machine 26 as defectives, injection nozzles 6 and needle valves 8 determined as defectives by the pull-up inspection machines 30 and 31 and the rotation inspection machine 32. Are sent according to the type of defect, and non-defective products are conveyed to the next process via the non-defective product delivery chute 35.

Numeral 36 denotes a control unit provided on the gantry 22 and composed of a sequencer or the like. The control unit 36 reads the inspection results by the inspection machines 26, 30, 31, 32 while rotating the index table 23, It sorts good and defective products.

Next, the first pulling-up inspection machine 30 will be described with reference to FIGS. Since the second pulling inspection machine 31 has the same configuration as the first pulling inspection machine 30, the description thereof is omitted.

In FIG. 2, reference numeral 37 denotes a support plate fixedly provided on the upper surface side of the gantry 22, and reference numeral 38 denotes an index table 23.
The support portion 39 is mounted on the support plate 37 and located on the outer pocket 23A, and a pressing bar 39 is provided on the support portion 38 so as to be movable up and down. An upper end is connected to a piston rod 40A of a fixing cylinder 40 fixed to a support plate 37, and a lower end thereof has a plurality of claw portions 39A, 39A,. ) Are provided integrally and spaced apart in the circumferential direction. Further, a fixing spring 41 is provided between the presser bar 39 and the support portion 38 to constantly urge the presser bar 39 downward, and a guide that moves up and down together with the presser bar 39 is provided above the presser bar 39. The rod 42 is connected.

When the piston rod 40A of the fixing cylinder 40 is extended, the pressing rod 39 is urged downward by the fixing spring 41, and presses the injection nozzle 6 to the index table 23 through each claw 39A. And the piston rod 4 of the fixing cylinder 40
When 0A is reduced, it is displaced upward against the spring force of the fixing spring 41, and each claw 39A is separated from the injection nozzle 6 to release the fixing.

Reference numeral 43 denotes another supporting portion which is located outside the outer pocket 23A of the index table 23 and is provided above the supporting plate 37. Reference numeral 44 denotes a vertical moving portion of the supporting portion 43 via guide rods 45, 45. Each of the frames is provided with a downwardly-facing U-shaped frame, and a pull-up torque meter 56 and the like described below are attached to the lower side of the frame 44.

Reference numeral 46 denotes a pulling motor which is located above the support portion 43 and is attached to the support plate 37, and 47 is provided between the pulling motor 46 and the frame 44. Pulling torque meter 56
And a vertical movement mechanism that constitutes a pulling means together with the measuring shaft 56A of the above. The vertical movement mechanism 47 is connected at its upper end to an output shaft 46A of a pulling motor 46 via a coupling 48 and a support unit 49. A ball screw 51 whose lower end is rotatably attached to a substantially central portion of the support plate 37 via a bearing 50 and a screw fixedly provided on the upper side of the frame 44 and screwed with the ball screw 51 on the inner peripheral side. And a movable portion 52 in which a groove (not shown) is formed. The vertical movement mechanism 47 displaces the frame 44 together with the movable part 52 up and down when the ball screw 51 rotates forward and backward by the lifting motor 46.

Reference numerals 53, 53 denote guide rods provided in the radial direction of the index table 23, provided below the frame 44, and reference numeral 54 denotes a mounting bracket slidably provided on each of the guide rods 53. The mounting bracket 54 is connected to a piston rod 55 </ b> A of a meter position adjusting cylinder 55 fixed to the frame 44. The mounting bracket 54 moves forward and backward as the piston rod 55A of the meter position adjusting cylinder 55 expands and contracts.

Reference numeral 56 denotes a pulling torque meter as axial torque detecting means attached to the lower end of the mounting bracket 54. The measuring shaft 5 of the pulling torque meter 56
As shown in FIG. 3, 6A is provided with a thin flat plate-like attachment 57 having a U-shaped or C-shaped distal end side sandwiching the valve shaft 8A of the needle valve 8. When the piston rod 55A of the meter position adjusting cylinder 55 extends, the lifting torque meter 56 moves toward the index table 23 together with the mounting bracket 54, and moves the attachment 57 to the large diameter portion 8B (the anchor 9) of the needle valve 8. ) Insert the measuring axis 5
6A is connected to the needle valve 8. In this state, the frame 44, the mounting bracket 54, and the like are pulled up by the pulling motor 46 and the vertical movement mechanism 47. When the needle valve 8 is pulled out of the injection nozzle 6, the pulling up is performed. Sometimes, an axial torque applied to the needle valve 8 is detected and output to the control unit 36.

Next, the rotation inspection machine 32 will be described with reference to FIGS.

In FIG. 4, 58 is a supporting plate constituting a part of the gantry 22, 59 and 59 are a pair of upper columns fixed on the supporting plate 58, and 60 and 60 are lower sides of each upper column 59. The upper support 59 is provided with an upper mounting plate 61 slidably in the axial direction, and the lower support 60 has a lower mounting plate 62 mounted thereon. It is slidably mounted in the direction.

An upper cylinder 63 is provided between the upper supports 59 and provided between the upper surface of the support plate 58 and the upper mounting plate 61. A support cylinder 64 is provided between the lower supports 60 and provided between the lower supports 60.
8 shows a lower cylinder provided between the lower surface side of the base plate 8 and the lower mounting plate 62. The cylinders 63 and 64 extend and retract their piston rods 63A and 64A in response to a control signal from the control unit 36. Each mounting plate 61,
62 is moved up and down.

Reference numeral 65 denotes a cylindrical housing located below the outer pocket 23A of the index table 23 and provided on the upper surface of the lower mounting plate 62.
, A rotary cylinder portion rotatably provided via bearings 67, 67, and 68, a chuck fixed to the upper end side of the rotary cylinder portion 66, respectively. As shown in FIG.
Semicircular claw portions 68A, 68A provided to face each other
And provided on the outer peripheral side of each claw portion 68A.
8A, and an annular spring 68B for biasing 8A radially inward. The chuck 68 is fitted to the lower side of the injection nozzle 6 in a state in which each claw portion 68A is pushed outward in the radial direction by an upward displacement of a diameter-enlarging rod 69 described later, and the downward displacement of the diameter-enlarging rod 69 is reduced. When each of the claws 68A is urged by the spring 68B, the injection nozzle 6 is fixed from below, and rotates together with the injection nozzle 6 and the rotary cylinder 66.

Reference numeral 69 denotes a small-diameter rod-shaped enlarged rod provided in the rotary cylinder portion 66. The enlarged rod 69 has an upper end located below the center of the chuck 68 and a lower end attached to a lower mounting plate. 6
2 is connected to a cylinder 70 for expanding the diameter.
The diameter-enlarging rod 69 is displaced axially upward due to the extension of the piston rod 70A of the diameter-enlarging cylinder 70, and the upper end side is inserted between the claws 68A of the chuck 68 to insert the respective claws. While spreading 68A radially outward,
When the piston rod 70A of the diameter-enlarging cylinder 70 is reduced, it is displaced axially downward, and each claw 68A is biased by a spring 68B to be displaced radially inward.

Reference numeral 71 denotes a rotation motor which is fixed to the lower mounting plate 62 and constitutes a rotating means together with the rotary cylinder 66 and the like. The output shaft 71A of the rotation motor 71 has a pulley 72,
It is connected to the lower side of the rotary cylinder 66 by the drive belt 73 and the drive belt 74. When the chuck 68 fixes the injection nozzle 6, the rotation motor 71 is driven by a control signal from the control unit 36, and
For example, the chuck 68 and the injection nozzle 6 are rotated 2.25 times (two rotations and one quarter rotation) with respect to the needle valve 8 together with the needle 6.

Reference numeral 75 denotes a rotation torque meter which is located on the outer pocket 23A of the index table 23 and is fixed to the upper mounting plate 61 as rotation torque detecting means. As shown in FIG. 5, a contact portion 76 formed in a stitch shape from a rubber material is provided. When the injection nozzle 6 is fixed by the chuck 68 and the upper mounting plate 61 moves downward, the rotation torque meter 75 moves the contact portion 76 to the anchor fixed to the needle valve 8 with a predetermined load W described later. 9, the injection nozzle 6 rotates in this state, and the needle valve 8
The rotational direction torque applied to the motor is detected, and this torque is output to the control unit 36.

Are linear bushings 78, 78 slidably provided on the outer peripheral side of the columns 59, 60.
Indicates load adjustment springs provided between the linear bush 77 of each upper column 59 and the support plate 58, and the load adjustment springs 78 always attach the upper mounting plate 61 upward through each linear bush 77. I'm going.

Reference numeral 79 denotes a load adjusting member provided as a load adjusting means provided above the upper mounting plate 61. The load adjusting member 79 is attached to the support plate 58 by a mounting bracket (not shown).
A pulley 79A rotatably mounted via a pulley, a wire 79B provided on the pulley 79A, one end of which is mounted on the upper mounting plate 61, and a weight 79C mounted on the other end of the wire 79B. It is configured.

The load adjusting member 79 resists the loads of the upper mounting plate 61, the rotating torque meter 75 and the like.
The upper mounting plate 61 is pulled upward according to the weight of the weight 79C. Thus, in combination with the spring force of each load adjusting spring 78, the contact portion 7 of the torque meter 75 for rotation
6 adjusts the axial load W for pressing the needle valve 8 downward, for example, to about 600 g.

Reference numeral 80 denotes a spring located on the outer peripheral side of the lower end of the diameter-enlarging rod 69 and provided between the rotary cylinder 66 and the piston rod 70A of the diameter-enlarging cylinder 70; Stoppers provided on the lower mounting plate 62 located on the outer peripheral side are shown, and the stoppers 81 restrict upward displacement of the lower mounting plate 62.

The first pulling-up inspection machine 30 according to the present embodiment has the above-described configuration. Next, the operation thereof will be described with reference to FIGS.

First, in the loading step shown in FIG. 6, the pressing rod 39 is positioned above the index table 23 against the spring force of the fixing spring 41 by reducing the piston rod 40A of the fixing cylinder 40. On the other hand, the piston rod 55A of the meter position adjusting cylinder 55 is contracted to retract the pulling torque meter 56 outside the index table 23. In the loading step, the frame 44 is displaced downward by the pulling motor 46 and the vertical movement mechanism 47, and the attachment 57 stands by so as to be located below the large diameter portion 8B (anchor 9) of the needle valve 8. ing.

Then, in this state, when the injection nozzle 6 with the needle valve 8 attached thereto is conveyed by the index table 23, the piston rod 40A of the fixing cylinder 40 is extended in the nozzle fixing step shown in FIG. Then, the pressing rod 39 is displaced downward, and the outer peripheral side of the upper end of the injection nozzle 6 is pressed downward by the respective claw portions 39A of the pressing rod 39 and fixed. Almost simultaneously, the piston rod 55A of the meter position adjusting cylinder 55 extends,
When the lifting torque meter 56 advances toward the index table 23 together with the mounting bracket 54, the attachment 57 sandwiches the valve shaft 8A located below the large diameter portion 8B of the needle valve 8.

Next, in the pulling process shown in FIG. 8, the pulling motor 46 is rotated while the injection nozzle 6 is fixed by each claw 39A of the presser bar 39, and the frame 44 and the pulling torque are The meter 56 and the like are displaced upward. Thereby, the attachment 57 comes into contact with the lower surface side of the large diameter portion 8B (anchor 9) of the needle valve 8,
The needle valve 8 is lifted by the attachment 57 and is displaced upward together with the pulling torque meter 56 and the like. When the needle valve 8 is completely pulled up from the inside of the injection nozzle 6, the pulling torque meter 56 detects an axial torque applied to the needle valve 8 and outputs this axial torque to the control unit 36.

Next, the injection nozzle 6 whose axial torque has been inspected by the first pulling inspection machine 30 in this manner,
The needle valve 8 is conveyed to the rotation inspection machine 32 by the index table 23, and the rotation inspection machine 32 inspects the rotation direction torque of the injection nozzle 6 and the needle valve 8.

That is, in the rotation inspection machine 32, the piston rod 63A of the upper cylinder 63 is extended and the upper mounting plate 6
1. Rotation torque meter 75 is index table 2
3 and by extending the piston rod 64A of the lower cylinder 64, the lower mounting plate 6
2. The housing 65, the rotating cylinder 66, the diameter-enlarging rod 69, the diameter-enlarging cylinder 70, the rotation motor 71, and the like are positioned below the index table 23. Also, the piston rod 70A of the diameter-enlarging cylinder 70 shrinks, whereby the diameter-expanding rod 69 is positioned on the lower side so that each claw 68
A is displaced radially inward. Note that the diameter-enlarging rod 69 may be displaced upward by the diameter-enlarging cylinder 70 to open the claws 68A of the chuck 68 in advance.

Then, in this state, when the needle valve 8 and the injection nozzle 6 after the first pulling torque test are carried in by the index table 23, as shown in FIG. Displacing the enlarged rod 69 upward through the piston rod 70A of the cylinder 70,
While pushing each claw portion 68A of the chuck 68 radially outward, the lower cylinder 64 fits the chuck 68 to the lower end side of the injection nozzle 6 to reduce the diameter of the piston rod 70A of the cylinder 70 for diameter expansion. The rod 69 is displaced downward, and each of the claws 68A of the chuck 68 is urged inward by a spring 68B to fix the injection nozzle 6.

Almost simultaneously with this chucking step, the upper mounting plate 61 was displaced downward by the upper cylinder 63, and the measuring shaft 75A of the torque meter 75 for rotation was fixed to the needle valve 8 via the contact portion 76. Anchor 9
The needle valve 8 comes into contact with the upper surface side, and is pressed axially downward by the load adjusting member 79 or the like with a predetermined load W.

In the rotation torque detecting step, the rotation motor 71 is driven while the lower end of the injection nozzle 6 is fixed by the chuck 68, and the rotation cylinder 71, the chuck 68, the injection nozzle 6, etc. are driven by the rotation motor 71. Is rotated in the direction of the arrow by, for example, two rotations and a quarter. As a result, the rotational torque applied to the needle valve 8 is detected by the rotational torque meter 75 via the contact portion 76,
The rotation torque meter 75 to the control unit 3
6 is output.

The injection nozzle 6 and the needle valve 8 for which the torque test in the rotation direction has been completed in this way are conveyed to the second pulling-up inspection machine 31 by the index table 23, and the second pulling-up inspection machine 31 Similar to the first pulling torque test shown in FIGS. 6 to 8 described above, the pulling torque is checked again.

Finally, when the second pulling torque inspection by the second pulling inspection machine 31 is completed, the control unit 36 makes a general pass / fail judgment, and the defective products are sent to the defective product stock chutes 33 and 34. The non-defective product is sent out to the next process by the non-defective product discharge chute 35.

Thus, according to the present embodiment, the injection nozzle 6 to which the needle valve 8 is assembled is transported to a predetermined position by the index table 23, and the injection nozzle 6 is pressed and fixed to the index table 23 by the presser bar 39. At the same time, the piston rod 55A of the meter position adjusting cylinder 55 is extended to insert the tip end of the attachment 57 below the large diameter portion 8B (anchor 9) of the needle valve 8, and in this state, the pulling motor 46 is rotated. The lifting torque meter 56 and the like are displaced upward by the vertical movement mechanism 47, whereby the needle valve 8 is pulled up from the injection nozzle 6 through the attachment 57, and the axial torque applied to the needle valve 8 at this time is reduced. Since it is configured to transmit the torque to the pulling torque meter 56 via the attachment 57, the injection The sliding resistance of the axial direction between the nozzle 6 and the needle valve 8 automatically, and it is possible to accurately inspect.

As a result, the manual inspection is abolished, the inspection standard is stabilized, the quality and the reliability can be improved, and the work efficiency of the assembling work and the inspection work is greatly improved.
Manufacturing costs can be reduced.

Further, the first pulling inspection machine 30
After the completion of the second pulling torque inspection, the rotation inspection device 32 rotates the injection nozzle 6 in the circumferential direction by two rotations and a quarter with respect to the needle valve 8, and the second pulling inspection device 31 performs the second pulling. Since the torque inspection is performed, the pulling torque can be inspected by changing the assembled state of the injection nozzle 6 and the needle valve 8, and the sliding resistance during the pulling can be inspected more accurately.

In the above embodiment, the rotation inspection machine 3 is provided between the first pulling inspection machine 30 and the second pulling inspection machine 31.
2, the rotation inspection machine 32 rotates the injection nozzle 6, and then the second lifting inspection machine 31 checks the lifting torque again. However, instead of this, only the lifting torque is used. When performing the inspection, the housing 65, the rotary cylinder 66, the chuck 68, and the diameter-enlarged rod 6 shown in FIG.
9, a nozzle rotation mechanism including a diameter-enlarging cylinder 70, a rotation motor 71, and the like may be added, and a single pull-up inspection machine 30 may be used to perform pull-up torque inspection, injection nozzle rotation, and pull-up torque inspection.

In the above-described embodiment, the index table 23 has been described as an example of the transporting means. Alternatively, for example, a bucket conveyor having a large number of pockets may be used.

[0063]

As described above in detail, according to the present invention, the conveying means for conveying the injection nozzle with the needle valve assembled thereto, the fixing means for fixing the injection nozzle conveyed by the conveying means, Pulling means for pulling up the needle valve in the axial direction with the injection nozzle fixed by fixing means, and axial torque detecting means for detecting an axial torque applied to the needle valve when the needle valve is pulled up by the pulling means. Therefore, the sliding resistance in the axial direction between the injection nozzle and the needle valve can be automatically and accurately inspected, and the quality and the work efficiency of the inspection work and the like can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a valve assembly inspection apparatus using a fuel injector pull-up inspection apparatus according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a pull-up inspection machine for a fuel injector in FIG. 1;

FIG. 3 is an enlarged longitudinal sectional view showing a main part in FIG. 2;

FIG. 4 is a longitudinal sectional view showing a rotation inspection machine for a fuel injector in FIG. 1;

FIG. 5 is an enlarged longitudinal sectional view showing a main part in FIG. 4;

FIG. 6 is a longitudinal sectional view showing a loading step.

FIG. 7 is a longitudinal sectional view showing a nozzle fixing step.

FIG. 8 is a longitudinal sectional view showing a pulling step and an axial torque detecting step.

FIG. 9 is an enlarged longitudinal sectional view showing a rotation torque detection step performed by a rotation inspection machine for a fuel injector performed between a first pulling torque test and a second pulling torque test.

FIG. 10 is a longitudinal sectional view of a conventional fuel injector.

FIG. 11 is an enlarged sectional view showing an injection nozzle and a needle valve in FIG. 10;

[Explanation of symbols]

 Reference Signs List 6 injection nozzle 8 needle valve 23 index table (transporting means) 30 first pulling inspection machine 31 second pulling inspection machine 39 presser bar (fixing means) 47 vertical movement mechanism (pulling means) 56 pulling torque meter (axial direction) Torque detection means)

Claims (1)

(57) [Scope of request for utility model registration] 1. A conveying means for conveying an injection nozzle with a needle valve assembled, a fixing means for fixing the injection nozzle conveyed by the conveyance means, and a needle valve in a state where the injection nozzle is fixed by the fixing means. Pulling-up inspection device for a fuel injector, comprising: pulling means for pulling up the needle valve in the axial direction; and axial torque detecting means for detecting an axial torque applied to the needle valve when the needle valve is pulled up by the pulling means. .