JP2010036319A - Apparatus and method for assembling minute cylindrical component with minute clearance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and method for assembling a cylindrical component into a hole. <P>SOLUTION: The assembling apparatus for assembling the cylindrical component into a hole with a minute clearance includes a chuck for retaining and guiding the cylindrical component, and a pressing-in rod. An inlet port part in which the cylindrical component is inserted, a rough guide hole, a pulling-in hole, and a hollow part are arranged in this sequence along a center axis of the chuck in the chuck. The pulling-in hole has an inner diameter for guiding the cylindrical component and retaining to move freely, the rough guide hole has an inner diameter larger than the pulling-in hole, and an inclination part is provided between the pulling-in hole and the rough guide hole. The pressing-in rod moving along the center axis of the chuck is made to internally exist in the hollow part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an assembling apparatus and method for assembling a micro cylindrical part into a hole with a micro clearance.

  As seen in Patent Document 1, a piezo actuator fuel injection device for a diesel engine uses a sliding pin that transmits displacement of a piezo piston to a control valve portion. This sliding pin is an extremely small cylindrical part and is assembled to the hole with a small clearance.

When assembling such a fine cylindrical part into a hole with a minute clearance, it is conceivable to use a conventional assembling apparatus as shown in Patent Document 2. In the conventional assembling apparatus shown in Patent Document 2, the chuck for holding the component is movable horizontally and inclined with respect to the arm, and is always vertical at the center position. The chuck is horizontally movable and tiltable due to the reaction force that acts on the tip of the component held by the chuck, and the assembled component follows the position and inclination of the hole to be assembled. It can be assembled to match.
However, when the parts are large, in the conventional apparatus, the applied force can be sufficiently increased so that horizontal movement and tilting are possible, but when the parts are small (for example, about φ1 mm × L4 mm), the acting force Has a problem that the chuck does not move because of the small size, and as a result, small parts cannot be assembled. That is, when assembled with a conventional apparatus, parts may be stressed, causing breakage and bending, which may make insertion impossible.

JP 2007-231737 A Japanese Utility Model Publication No. 6-15989

  In view of the above problems, the problem of the present invention is that even with a small part, the position of the chuck shaft and the hole of the assembly can be shifted with a small force, and the chuck shaft and the hole shaft of the assembly can be displaced. To provide an assembling apparatus and method that can be assembled even when the clearance between the component and the hole is small by adjusting the inclination.

  The invention of claim 1 is an assembling device (4) for assembling the cylindrical part into the hole (21) with a small clearance, the assembling apparatus comprising a check (10) for holding and guiding the cylindrical part; A push rod (12), and an inside of the check (10), an inlet portion (16) into which the cylindrical part (1) is inserted along the central axis of the chuck (10), a rough A guide hole (11), a lead-in hole (14), and a hollow part (13) are arranged in this order, and the lead-in hole (14) guides the cylindrical part (1) and holds it movably. The rough guide hole (11) has an inner diameter larger than the drawing hole (14), and an inclined portion (between the drawing hole (14) and the rough guide hole (11)). 15), and the hollow part (13) has a front Said push rod to move along the central axis of the chuck (10) (12) is a device assembly which has been internalized.

  As a result, even for a minute part (φ1mm × L4mm), the positional deviation between the chuck shaft and the hole of the assembly can be adjusted with a small force, and the chuck shaft and the hole axis of the assembly can be tilted. As a result, adjustment is possible even when the clearance between the component and the hole is small.

  According to a second aspect of the present invention, in the first aspect of the present invention, the hollow portion (13) communicates with a vacuum device so that the fine cylindrical component (1) is drawn into the drawing hole (14) by vacuum suction. It is characterized by that. Thus, in addition to the function and effect of the first aspect of the present invention, the fine cylindrical part can be sucked and held without applying stress, and can be steadily held on the chuck during conveyance.

According to a third aspect of the present invention, there is provided a method of manufacturing a fuel injection device in which the sliding pin (1) used in the fuel injection device is held by the chuck (10) and assembled to the hole (21) of the valve body (2) with a small clearance. The chuck (10) includes an inlet portion (16) into which the sliding pin (1) is inserted along the central axis of the chuck, and a rough guide hole (11) inside the check (10). The drawing hole (14) and the hollow portion (13) are arranged in this order, and the drawing hole (14) has an inner diameter that guides the sliding pin (1) and holds it movably. And the rough guide hole (11) has an inner diameter larger than that of the lead-in hole (14), and an inclined portion (15) is provided between the lead-in hole (14) and the rough guide hole (11). A chuck (10) provided with The step of drawing the sliding pin (1) into the drawing hole (14) by empty suction and holding the sliding pin (1) on the chuck (10); and the holding the sliding pin (1) The step of positioning the chuck (10) in the hole (21) of the valve body (2), the sliding pin (1), the rough guide hole (11), and the hole of the valve body (2) A step of pushing the sliding pin (1) out of the pull-in hole (14) by the push-in rod (12) contained in the hollow portion until it floats with the inlet chamfered portion (23) of (21); Further, after the floating, the pushing rod (12) further includes a step of pushing the sliding pin (1) into the hole (21) of the valve body (2).
Thus, as in the first and second aspects of the invention, even with a small part, the position of the chuck shaft and the hole in the assembly can be shifted with a small force, and the chuck shaft and the hole in the assembly can be used. Assembly is possible even when the inclination of the shaft is adjusted and the clearance between the part and the hole is small.

  In addition, the code | symbol attached | subjected above is an example which shows a corresponding relationship with the specific embodiment as described in embodiment mentioned later.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram illustrating an example of an assembly component and an assembly component. In FIG. 1, 1 is a sliding pin, 2 is a valve body which comprises a part of fuel injection apparatus. The size of the sliding pin 1 is, for example, about φ1 mm × L4 mm, and is incorporated in the hole 21 of the valve body 2. As an example, the fitting clearance between the valve body 2 and the hole 21 is 5 microns or less. An entrance chamfer 23 is provided at the entrance of the hole 21. A needle and a spring are inserted into the hole 22. The valve body and sliding pin that constitute a part of the fuel injection device described above are merely examples, and the assembly parts and the assembly parts are not limited to these. Anything that can be inserted with clearance is applicable.

  FIG. 2 is an overall view showing an embodiment of the present invention. The assembling apparatus 4 according to an embodiment of the present invention is attached to a biaxial or triaxial orthogonal robot 5 as an example. This robot is preferably capable of teaching and having a positioning accuracy of about ± 0.05 mm coaxial. The robot may be a scalar type or other known robots. Below the assembling apparatus 4, a chuck 10 which is a part of the feature of the present invention is attached. Further, a pull-in hole 14 is provided inside the chuck 10, and the pull-in hole 14 communicates with a vacuum device connected by a hose 6 through a hollow portion 13 described later, and vacuum can be drawn in the pull-in hole 14. It is like that.

  As a part to be assembled, the valve body 2 is positioned and set on the transport pallet 3 with pins 31 and placed. The conveyance of the conveyance pallet 3 will be described later.

  FIG. 3 is an enlarged cross-sectional view of the chuck 10 in the lower part of the assembling apparatus 4. The chuck 10 is provided with an inlet portion 16, a rough guide 11, a pull-in hole 14, and a hollow portion 13 communicating with each other from below in the drawing. An inclined portion 15 is provided between the rough guide 11 and the drawing hole 14, and the inclined portion 15 serves to be inserted into the drawing hole with the end face of the sliding pin 1 being guided as will be described later. Plays. The inner diameter difference between the rough guide 11 and the drawing hole 14 is determined experimentally. When the sliding pin 1 floats in the rough guide, the inner diameter difference between the rough guide 11 and the drawing hole 14 is set so that the angle at which the sliding pin 1 is inclined with respect to the vertical direction is within a predetermined allowable deviation angle α. You just have to decide.

  Next, the operation principle of assembling the sliding pin 1 into the hole 21 with a minute clearance will be described with reference to FIGS. FIG. 4 is a schematic view of taking out the sliding pin 1 set up on the pin supply unit 51, and FIG. 5 is a schematic view when the sliding pin 1 is conveyed to the assembly position. FIG. 6 is a schematic view of the assembly, FIG. 6 (a) is a schematic view in which the sliding pin 1 is positioned in the hole of the assembly component, and FIG. 6 (b) is a state where the push rod 12 is pushed out. FIG. 6 (c) is a schematic view in which the sliding pin 1 is pushed into the hole of the assembly part.

  As shown in FIG. 4, the chuck 10 attached to the robot is positioned with respect to the sliding pin 1 erected on the component supply unit, and descends toward the sliding pin 1 from above. When the upper end of the sliding pin 1 comes near the inclined portion 15 of the chuck 10, the robot stops descending. Vacuum suction is started, and the sliding pin 1 is guided and drawn into the drawing hole 14 by vacuum drawing.

  Next, as shown in FIG. 5, the sliding pin 1 is held by the chuck 10 and conveyed from the component supply unit to the assembly unit. As shown in FIG. 6A, the robot is positioned so that the axis of the chuck is positioned at the center of the hole 21 of the assembly portion, and then the chuck is lowered, as shown in FIG. 6B. Stop descent at position. The descent stop position is determined empirically between the position of the chuck inclined portion 15 and the entrance chamfered portion (23) of the hole (21) so that the sliding pin 1 floats in view of its length. Good. When the floating occurs, the sliding pin 1 is pushed into the hole of the assembly part as shown in FIG.

  In this case, if the sliding pin 1 is inclined too much, it cannot be pushed in. Therefore, the angle at which the sliding pin 1 is inclined with respect to the vertical direction in the rough guide hole 11 is within a predetermined allowable deviation angle α that can be pushed. So that the inner diameter difference between the rough guide 11 and the lead-in hole 14 is determined empirically.

  A manufacturing method when the assembly device 4 described above is applied to a manufacturing method of a fuel injection device will be described. FIG. 7 is a schematic diagram of a valve assembly process that is a part of the method of manufacturing the fuel injection device. FIG. 8 is a schematic view showing a valve assembly line that is a part of a production line for a fuel injection device.

In FIG. 8, 30 is a belt gripper that grips the pallet 3 and intermittently conveys it at every conveyance pitch, 40 is an inner diameter measuring unit, 50 is a pin assembly unit, 51 is a pin supply unit, 60 is a spring and needle assembly unit, 70 is a plate assembly part, 80 is a valve lift inspection part, and 90 is a defective discharge part. The valve assembly process, which is a part of the method for manufacturing the fuel injection device, is performed as follows.
First, the valve body 2 is set on the transport pallet 3. Next, the transport pallet 3 is transported to the belt gripper 30 inlet. The belt gripper 30 intermittently conveys for each conveyance pitch, and performs a predetermined operation on the valve body 2 positioned on the conveyance pallet 3 in each step. In the inner diameter measuring unit 40, the inner diameter of the hole in which the sliding pin is to be assembled is measured with an air micro.

The pin supply unit 51 selects the sliding pin 1 corresponding to the measured value of the inner diameter, and moves the assembly device 4 attached to the robot of the pin assembly unit 50 to the selected sliding pin 1. Position it.
After sucking and holding in the pull-in hole 14, the robot is controlled to position the chuck 10 on the hole 21 of the valve body 2 on the transport pallet. At this time, the central axis of the sliding pin 1 and the axis of the hole 21 of the valve body 2 coincide with each other with a predetermined accuracy. The chuck 10 is lowered to stop positioning at a predetermined distance.

  Next, the suction is stopped, and the sliding pin 1 is pushed out from the rough guide hole 11 of the chuck 10 with the pushing rod 12, and the movement of the pushing rod 12 is stopped. At this time, the pin is free between the inclined portion 15 of the rough guide hole 11 of the chuck 10 and the inlet chamfered portion 23 of the hole 21 of the valve body 2 to correct the positional deviation and the inclination. Thereafter, the sliding pin 1 is pushed again with the push rod 12 and assembled into the hole 21 of the valve body 2.

  When the sliding pin 1 is assembled to the valve body 2 at the pin assembly portion 50, it is then transferred to the spring / needle assembly portion 60, and the spring and needle are assembled to the hole 22 of the valve body 2. Further, the plate is assembled so that the plate covers the hole 22 by the plate assembly unit 70, and after the inspection by the valve lift inspection unit 80, the defective product is discharged from the defective discharge unit 90. The remainder after the defective product is removed is transferred to the main assembly process of the fuel injection device.

As shown in FIG. 9, the valve body 2 can be assembled in the same manner even when the valve body 2 is upside down as in the embodiments described above.
Although the sliding pin of the fuel injection device has been described as the fine cylindrical part, the present invention is not limited to this, and for example, the present invention can be applied to any fine cylindrical part of about φ1 mm × L4 mm. Furthermore, it goes without saying that the present invention can be applied not only to a fine cylindrical part, but also to a lightweight cylindrical part that is larger than this.
Although vacuuming is used when the sliding pin is held by the chuck, the robot can be lowered to hold the sliding pin in the drawing hole 14 regardless of this. In that case, a mechanical holding means may be provided so that the held sliding pin does not fall.

It is the schematic which shows an example of an assembly component and an assembly component 1 is an overall view showing an embodiment of the present invention. FIG. 4 is an enlarged cross-sectional view of the chuck 10 at the lower part of the assembling apparatus 4. It is the schematic which takes out the sliding pin 1 stood by the pin supply part 51. FIG. FIG. 5 is a schematic view when the sliding pin 1 is conveyed to the assembly position. FIG. 6 is a schematic view of the assembly, FIG. 6 (a) is a schematic view in which the sliding pin 1 is positioned in the hole of the assembly portion, and FIG. 6 (b) is pushed out by the push rod 12. FIG. 6 (c) is a schematic diagram in which the sliding pin 1 is pushed into the hole of the assembly part. It is a rough schematic diagram of the valve assembly process which is a part of the manufacturing method of a fuel injection device. It is the schematic which shows the valve | bulb assembly line which is a part of manufacturing line of a fuel injection apparatus. It is the schematic which shows the assembly | attachment in case the valve body 2 is upside down.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fine cylindrical part, sliding pin 2 Valve body 3 Conveying pallet 4 Assembly apparatus 5 Robot 6 Hose 10 Chuck 11 Rough guide 12 Push rod 13 Hollow part 14 Pull-in hole 15 Inclined part 16 Inlet part 21 Hole 22 Hole 23 Inlet chamfer part 30 Belt gripper 31 Pin 40 Inner diameter measuring section 50 Pin assembly section 51 Pin supply section 60 Spring / needle assembly section 70 Plate assembly section 80 Valve lift inspection section 90 Defect discharge section

Claims (3)

An assembly device (4) for assembling the cylindrical part (1) into the hole (21) with a small clearance,
The assembly device (4) comprises a check (10) for holding and guiding the cylindrical part, and a push rod (12),
Inside the check (10), along the central axis of the chuck (10), an inlet part (16) into which the cylindrical part (1) is inserted, a rough guide hole (11), a lead-in hole (14) The hollow portion (13) is arranged in this order,
The pull-in hole (14) has an inner diameter that guides and holds the cylindrical part (1) and is movable, and the rough guide hole (11) has a larger inner diameter than the pull-in hole (14). An inclined portion (15) is provided between the lead-in hole (14) and the rough guide hole (11).
The assembling apparatus in which the pushing rod (12) moving along the central axis of the chuck (10) is built in the hollow portion (13).   The assembly according to claim 1, wherein the hollow part (13) communicates with a vacuum device so that the cylindrical part (1) is drawn into the drawing hole (14) by vacuum suction. apparatus. In the manufacturing method of the fuel injection device, the sliding pin (1) used in the fuel injection device is held by the chuck (10) and assembled to the hole (21) of the valve body (2) with a small clearance.
The chuck (10) includes an inlet portion (16) into which the sliding pin (1) is inserted along the central axis of the chuck, a rough guide hole (11), and a pull-in portion inside the check (10). A hole (14) and a hollow part (13) are arranged in this order, and the lead-in hole (14) has an inner diameter that guides and holds the sliding pin (1). Furthermore, the rough guide hole (11) has a larger inner diameter than the drawing hole (14), and an inclined portion (15) is provided between the drawing hole (14) and the rough guide hole (11). A chuck (10) comprising:
Drawing the sliding pin (1) into the drawing hole (14) by vacuum suction and holding the sliding pin (1) on the chuck (10);
Positioning the chuck (10) holding the sliding pin (1) in the hole (21) of the valve body (2);
Until the sliding pin (1) floats between the rough guide hole (11) and the inlet chamfered portion (23) of the hole (21) of the valve body (2), it is inherent in the hollow portion. The pushing rod (12) pushes the sliding pin (1) out of the drawing hole (14);
The method of manufacturing a fuel injection device, further comprising the step of the pushing rod (12) pushing the sliding pin (1) into the hole (21) of the valve body (2) after the floating.

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