JPH055612B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention provides a semicircular arc-shaped split part, that is, a kotta, to an engine valve to be assembled.
This invention relates to a device for assembling a shaft in a fixed position at a predetermined position.

PRIOR ART As a device for automatically assembling a split-type cotter inside a retainer, there is one described in FIG. 18 on page 47 of "Machines and Tools" of the November 1979 issue. In that technique, the separated stubble is fed into the interior of the retainer by the downward movement of the stubby inserting head and is locked in the groove portion of the valve shaft. In such a device, when a pair of cotters are assembled, they are restrained only inside the taper hole of the retainer, resulting in a temporary unstable state.
It cannot be assembled reliably and smooth operation cannot be expected.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to hold a split type kotta in a stable state during the process of assembling it into the taper hole of the retainer, and to
The object is to be able to securely engage the groove portion of the valve shaft.

SUMMARY OF THE INVENTION Therefore, the present invention has a pair of component supply holes facing the center hole of a head main body that can move forward and backward, and a centering rod that is provided inside the center hole so as to be able to move forward and backward, and a taper between the centering rod and the retainer. The centering rod is positioned by fitting into the hole, and the centering rod is raised to open the component supply hole, and the split rod is guided by the central guide member and inserted into the tapered hole of the retainer. We are ensuring a reliable supply of

Configuration of the Invention Hereinafter, the configuration of the present invention will be specifically described based on embodiments shown in the drawings.

First, FIG. 1 shows a parts assembling apparatus 1 of the present invention.
It shows the overall structure of. This parts assembling device 1 is provided in the middle of an automatic assembly line, and the workpieces 2 to be assembled are transferred to a conveying means 3.
is fed to this assembly station, where it is fixed in position by clamping means 4.

As shown in FIG. 2, the workpiece 2 is, for example, a cylinder head of an automobile engine, and is provided with a pair of valves 5 at a predetermined angle of inclination.
In other words, these valves 5, for the workpiece 2,
It is inserted in advance from the bottom to the top. A spring seat 6, a coil spring 7, and a retainer 8 are sequentially inserted into the valve shaft 5a in advance.

The parts assembling device 1 of the present invention is for assembling a split type cotter 9 into the tapered hole 8a of the retainer 8, and the part assembling device 1 is for assembling a split type cotter 9 into the taper hole 8a of the retainer 8, and the holder 9 has the same inclination at the upper position on the axis of each valve shaft 5a. The head body 10 is provided. The head body 10 is fixed to the upper end of a drive rod 13 by an arm 12, as shown in FIG.
This drive rod 13 is slidably supported on the frame 11 with the same inclination as the valve shaft 5a, and engages with a roller 16 at one end of the drive arm 15 by a notch 14 at its lower end. This drive arm 15 is connected to the frame 11.
A spline shaft 18 rotatably supported by
The piston rod 21 of the drive cylinder 20 is fitted into a groove portion of the interlocking body 22 formed at the tip of the piston rod 21 of the drive cylinder 20 via the other drive arm 19 and the roller 17 at its tip. Therefore, the head body 10 is moved forward and backward by the drive cylinder 20 on the same axis as the valve shaft 5a.

On the other hand, as shown in FIG. 3, the head body 10 has a center hole 23 on the axis of the valve shaft 5a.
A hollow centering rod 24 is held within the center so that it can move forward and backward. One end of this centering rod 24 is
A piston 26 of a pressing cylinder 25 is integrally formed at the upper end of the head body 10, and a tapered, substantially conical centering surface 27 is integrally formed at the lower end. are doing. Here, the cylinder 25 and the piston 26 constitute driving means for the centering rod 24. The center hole 23 opens at a receiving surface 28 in the shape of a truncated cone depression formed on the end surface of the head body 10, and the tip of the centering rod 24, that is, the centering surface 27, is opened at the receiving surface 28. It is designed so that it can protrude in the center position.

Further, this hollow centering rod 24 accommodates a hollow guide rod 29 therein so as to be movable forward and backward. At the tip of the guide rod 29, a guide protrusion 30 in the axial direction is integrally formed on the diametrical line in order to correspond to the split-type cotter 9 and to regulate their posture in the feeding state. The pair of guide protrusions 30 connect the center hole 23 to the pair of component supply holes 3.
It is divided into 5 parts. Note that the centering rod 24 corresponds to the part where the guide protrusion 30 is formed.
An escape groove 31 is formed in the. The upper end portion of this guide rod 29 is connected to the head cap 10.
A compression spring 34 is provided inside the head cap 10a and serves as a spring receiver 32, and a compression spring 34 is provided between the spring receiver 32 and a cap 33 attached to the top surface of the head cap 10a.

Furthermore, a pair of component supply holes 35 are symmetrically formed in the lower portion of the center hole 23. These component supply holes 35 are for supplying the tipper 9, face a position below the upper limit of the centering rod 24, and communicate with the lower part of the center hole 23. These component supply holes 35 are each connected to a parts feeder of the heater 9 through a chute 36.

Effects of the Invention Next, a series of operations and effects of the above-mentioned parts assembling apparatus 1 will be explained.

As already mentioned, the workpiece 2 is sent to a predetermined position in the component assembly device 1 by the conveyance means 3, and there, the workpiece 2 is moved by the clamping means 4 while being positioned
Fixed by After that, the drive cylinder 20
By pulling down the drive rod 13, the head body 10 is advanced to the tip position of the valve shaft 5a of the workpiece 2.

At this time, since the centering surface 27 of the centering rod 24 protrudes from the receiving surface 28 as shown in FIG. 5, the receiving surface 28 contacts the upper surface of the retainer 8 as shown in FIG. , the centering surface 27 fits into the tapered hole 8a of the retainer 8.
In this way, the retainer 8 is centered with respect to the head body 10 inside the receiving surface 28.

After this centering is completed, the head body 10 is further lowered as shown in FIG.
descends against the elasticity of the coil spring 7. At this time, the tip of the valve shaft 5a enters the hole of the centering rod 24, hits the lower end of the guide rod 29, and presses it against the compression spring 34.
The head body 10 is pulled up relative to the head body 10 by overcoming the elasticity of the head body 10.

Thereafter, as shown in FIG. 8, compressed air is fed into the lower cylinder chamber of the cylinder 25, and the centering rod 24 is moved inside the head body 10 in the stopped state.
move slightly above the open surface of the component supply holes 35, so those component supply holes 35 are open to the center hole 23. In this state, a pair of split molds 9 are fed through the respective parts feed holes 35 using a parts feeder (not shown) or the like. At this time, by sending air to the component supply hole 35, it is possible to confirm that the cotter 9 is being supplied normally. Then, each cotter 9 passes through the center hole 23 from the component supply hole 35 in the assembled position, falls into the tapered center hole 8a of the retainer 8, and is fitted therein. At this time, the valve shaft 5a and the guide rod 29 are connected to each other at the center hole 23, leaving only a space in the feeding direction of the rod 9, and the pair of guide ridges 30 of the guide rod 29 are connected to the pair of rods 9. Since they are partitioned so as not to interfere with each other, the pair of retainers 9 do not assume an unstable posture when they fall, and enter the center hole 8a of the retainer 8 while maintaining the assembled posture.

Thereafter, as shown in FIG.
descends again, hits the upper end of each cotter 9 after being supplied, and presses it against the tapered hole 8a of the retainer 8. In this way, the head 10 rises while pressing against the bolt 9 with the centering rod 24, completing the assembly. In this way, the split mold kotta 9 fits inside the tapered hole 8a, and the protrusion 9a on the inner periphery thereof
is locked in the groove 5b of the valve shaft 5a. When the pair of levers 9 are thus locked in the grooves 5b inside the tapered hole 8a, the retainer 8 is fixed to the valve shaft 5a in a manner that prevents it from coming off, so that the coil spring 7
By this, a biasing force is constantly applied in a direction to push the valve 5 upward.

In this series of assembly processes, it is necessary to confirm the insertion. This insertion confirmation can be detected by supplying pressurized air 37 to the inside of the guide rod 29, as shown in FIG. When the pair of sticks 9 are housed in the center hole 8a of the retainer 8,
The center hole 23 is almost sealed by the retainer 8 and the clasp 9. Therefore, if an annular ring 39 and a pressure switch 38 are attached,
The pressure change makes it easy to confirm insertion.

Effect of the invention The present invention provides the following unique effects.

First, the relative positions of the head body and the objects to be assembled, that is, the valve shaft and retainer, are accurately determined by the receiving surface of the head body and the centering rod. No abnormal external force is applied to the head or the head body, so assembly is performed smoothly and there is no damage to these parts.

In addition, during the feeding process of a pair of cotters, even while the centering rod is rising, the guide rod in the center hole and the valve shaft in contact with its lower end regulate the posture of the cotters in the feeding state. The position is not unstable, so incorrect insertion can be prevented, and reliable assembly is possible.

Further, since such assembly is performed in an orderly manner by the reciprocating movement of the head body and centering rod, reliable assembly can be performed at high speed and efficiently. Moreover, since the device is compact, multi-axis assembly is possible in small spaces and intervals.

[Brief explanation of drawings]

Fig. 1 is an overall front view of the parts assembling device of the present invention, Fig. 2 is a front view of a part of the driving portion of the head main body, Fig. 3 is a sectional view showing the inside of the head main body, and Fig. 4 is a FIGS. 5 to 10 are enlarged horizontal cross-sectional views of a portion of the centering rod and guide rod, and FIGS. 5 to 10 are partial cross-sectional views showing the sequence of assembly operations. 1... Parts assembly device, 2... Workpiece, 5...
...Valve, 8...Retainer, 9...Split type kotsuta, 10...Head body, 23...Center hole, 24
... Centering rod, 27 ... Centering surface, 28 ...
Receiving surface, 29... Guide rod, 30... Guide protrusion, 31... Relief groove, 35... Parts supply hole, 37
... Pressure air for checking installation, 38 ... Pressure switch.

Claims (1)

[Claims] 1. A pair of component supply holes 35 are provided midway through the center hole 23 of the head body 10 which can be moved back and forth, and a recessed receiving surface 28 is formed at the open end of the center hole 23. A hollow centering rod 24 is provided so as to be able to move forward and backward in the section from the receiving surface 28 to a position where the pair of component supply holes 35 are opened, and this centering rod 24 is connected to drive means 25 and 26 that move it forward and backward in the said section. A guide rod 29 biased toward the receiving surface 28 is provided at the center of the centering rod 24 so that it can move forward and backward, and the centering rod 24 also has a tapered, substantially conical centering surface 27 at its tip. , and a pair of guide protrusions 30 are formed on the guide rod 29 to divide the center hole 23 into each pair of component supply holes 35.