JPH027021Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a clip fitting device used for fitting a cutting clip into an annular groove formed on the inner periphery of a through hole of a workpiece.

(Prior art) Conventionally, this type of device is equipped with a guide block that can be joined to the opening surface of a through-hole of a workpiece, and has a large-diameter hole through which a cutting clip can be inserted freely into the block, and a tapered hole that is continuous with the large-diameter hole. It is known that the clip is inserted into the through hole of the workpiece while reducing its diameter from the large diameter hole through the tapered hole and fitted into the annular groove on the inner circumference of the workpiece.

(Problem to be solved by the invention) In order to firmly fit the cut clip into the annular groove, when the cut clip is reduced in diameter to the same extent as the diameter of the through hole, the cut ends should be aligned with each other. It is desirable to use a clip with a relatively large diameter that can be wrapped, so that the clip can be fitted into the annular groove with high elasticity. If the clip is in the tapered hole, the diameter of the clip may not be reduced any further due to the abutment of the cut ends, and the clip may become supported, resulting in the inconvenience that the pushing operation cannot be carried out smoothly and reliably.

An object of the present invention is to provide a fitting device that solves these problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention is a clip fitting device for fitting a cutting clip into an annular groove on the inner circumference formed in a through hole of a workpiece. A guide block that can be freely joined to the opening surface of the through-hole is formed in the block, and a large-diameter hole through which the clip can be inserted freely and a tapered hole continuous to the hole are formed in the block, and the clip is inserted into the large-diameter hole. The guide plate is inserted into the cut portion of the clip along the generatrix direction on one side of the periphery of the large diameter hole, the guide plate being inserted into the large diameter hole while reducing its diameter through the tapered hole. At the same time, the cross-sectional shape of the peripheral wall surface of the tapered hole is formed into a spiral shape having a step in the radial direction located on the extension line of the plate, and the step is successively arranged toward the tip of the tapered hole. It is characterized by its high length.

(Example) The present invention will be explained with reference to the illustrated embodiments.

The illustrated embodiment is a clip fitting device for fitting a cut clip d for preventing the piston pin from coming out into an annular groove c on the inner circumference formed in a through hole b for the piston pin insertion in a workpiece a consisting of an engine piston. This is an application to which the present invention is applied, and with reference to FIG. A guide block 3 is provided which can move forward and backward toward the workpiece, and the block 3 can be moved forward by a cylinder 3a and joined to the opening surface of the through hole of the workpiece a on the jig 2. In the illustrated example, the blocks 3 are placed on both the left and right sides of the jig 2, and the clips d are simultaneously fitted into the annular grooves c, c on the inner periphery of both ends of the through hole b passing through the workpiece a. I did it like that.

The block 3 is formed with a large diameter hole 4 through which the cutting clip d can be freely inserted, and a tapered hole 5 continuous with the large diameter hole 4.
The cutting clip d inserted from the input port 6 on the upper surface of the tail end of the clip is inserted between the large diameter hole 4 and the tapered hole 5 by a pushing bar 7 operated by a cylinder (not shown) arranged concentrically with the large diameter hole 4. The diameter of the workpiece was reduced through the hole b of the workpiece a.

Here, according to the present invention, the guide plate 8 is inserted into the cut portion of the cut clip d along one side of the periphery of the large diameter hole 4, for example, along the lower generatrix direction.
and the cross-sectional shape of the peripheral wall surface of the tapered hole 5 is formed into a spiral shape having a radial step 9 located on an extension line of the plate 8, as shown in FIGS. 2 and 4, Furthermore, the step 9 is connected to the tapered hole 5.
The length of the clip d is gradually increased toward the distal end thereof, so that the cut ends of the cut clip d are wrapped inward and outward in the radial direction as the diameter of the cut clip d decreases, as will be described later. Incidentally, the diameter D of the tapered hole 5 in the vertical direction from the lower edge of the step 8 at the tip thereof is made to be approximately equal to the piston pin diameter.

The pushing bar 7 is provided with a plurality of split pieces 7a extending forward at equal intervals in the circumferential direction, as shown in FIG. It is possible to accurately push the hole from the diameter hole 4 to the tapered hole 5 without tilting the posture.

(Function) To explain the function of the present invention based on the above-mentioned embodiment, first, with the guide block 3 joined to the through-hole opening surface of the workpiece a, the cutting clip d is inserted into the large diameter hole 4 through the inlet 6. According to this, the guide plate 8 in the large diameter hole 4 is inserted into the cut part, and then the push bar 7 is inserted.
If you insert the into the large diameter hole 4 and press the clip d,
The clip d is guided by the plate 8 and is pushed into the tapered hole 5 through the large diameter portion 4 with the cut portion facing downward.

Then, the diameter of the clip d is gradually reduced by the subsequent advancement within the tapered hole 5, but at this time, the cut portion of the clip d is located on the extension line of the plate 8 around the tapered hole 5. Since it matches the step 9 on the wall surface, the gap in the circumferential direction between the cut ends of the clip d decreases due to diameter reduction, and at the same time, the gap in the radial direction between the cut ends increases due to the increase in the height of the step 8. However, if the height of the step 8 at the tip side of the tapered hole 5, where the circumferential gap between the cut ends becomes zero, is set to be greater than the width L of the clip d, from now on, the cut ends will not meet each other. The clip d wraps inward and outward in the radial direction without causing abutment between the two, and the clip d fits into the tapered hole 5.
It is reduced in diameter without being supported inside, and is pushed into the through hole b of the workpiece A from its tip, and when it matches the annular groove c, it is fitted into the groove c by its own elasticity.

If the cut ends are chamfered, even if the height of the step 8 is not greater than the width L of the clip d, the cut ends will be guided by the chamfered slope and wrapped radially inward and outward as the diameter is reduced. Ru. Even in this case, the step 8
This functions effectively to reduce the strain between the cut ends and to facilitate the pushing of the clip d.

(Effect of the invention) As described above, according to the invention, the cut clip is pushed into the tapered hole by the guide plate provided in the large diameter hole so that the cut part matches the step of the tapered hole, and is guided into the step groove. so that the cut ends of the clip are wrapped inside and outside in the radial direction,
This eliminates the disadvantages of the prior art, in which the cut clip is supported within the tapered hole by butting the cut ends together, and has the effect of improving the workability of the clip insertion work.

[Brief explanation of drawings]

Fig. 1 is a cutaway side view of one example of the device of the present invention, Figs. 2 and 3 are cutaway sectional views taken along - and - lines in Fig. 1, respectively, and Fig. 4 shows a part of the guide block cut away. FIG. a... Workpiece, b... Through hole, c... Annular groove, d
... Cutting clip, 3... Guide block, 4...
... Large diameter hole, 5 ... Tapered hole, 8 ... Guide plate, 9 ... Step.

Claims (1)

[Scope of utility model registration request] A clip fitting device for fitting a cutting clip into an annular groove on the inner periphery formed in a through hole of a workpiece, the device includes a guide block that can be freely joined to the opening surface of the through hole of the workpiece, and the clip can be freely inserted into the block. A large-diameter hole through which the clip can be freely inserted and a tapered hole continuous to the large-diameter hole are formed, and the clip is pushed into the through-hole while reducing its diameter from the large-diameter hole through the tapered hole. A guide plate, which is inserted into the cut portion of the clip, is provided protrudingly in the large diameter hole along the generatrix direction on one side of the periphery, and the cross-sectional shape of the peripheral wall surface of the tapered hole is formed on an extension line of the plate. 1. A clip insertion device characterized in that the clip is formed into a spiral shape having a step in the radial direction located at the center of the hole, and the step is formed to increase in height toward the tip of the tapered hole.