JP2015020219A - Extraction device of annular component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extract an annular component from a hole, even if the annular component press fitted and fixed into the hole of a machine component or the like does not have a portion over which a hook is to be hooked.SOLUTION: Each tip of a pair of claw members 12, 12 is engaged in the bitten state from right and left both lateral sides with the inner periphery of an annular component 1 press fitted and fixed into a hole 2a of a machine component 2 by fastening rotation of a screw shaft 3, and the pair of claw members 12, 12 are lifted in the state where each tip is engaged in the bitten state with the annular component 1, to thereby extract the annular component 1 from the hole 2a of the machine component 2.

Description

  The present invention relates to an annular part extracting device for extracting an annular part inserted and fixed in a hole of a machine part or the like by relatively pulling up a removal member screwed with the screw shaft by tightening rotation of the screw shaft.

Conventionally, as this kind of annular part extracting device, there is a bearing extracting device described in Patent Document 1.
This is because the hook is moved from the tapered large diameter side to the small diameter side so as to be on the tapered rolling surface of the bearing outer ring, the outer end of this hook is hooked on the end surface of the bearing outer ring, and the bearing (annular part) is pulled out from the hole. This is a bearing drawing device.

Japanese Patent Laid-Open No. 04-105881

  In the conventional annular part extracting device, when there is no portion for hooking the annular part inserted and fixed in the hole, the annular part cannot be extracted from the hole.

  The present invention has been made in view of the above circumstances, and even when there is no portion for hooking the annular component inserted and fixed in the hole, the annular component can be extracted from the hole. It is an object to provide an extraction device.

  In order to achieve the above-mentioned object, the invention according to claim 1 is configured to extract the annular component inserted and fixed in the hole by relatively pulling up the extraction member screwed with the screw shaft by tightening rotation of the screw shaft. In the annular part extracting device, the tip has a tapered shape, and the screw shaft is moved downward with respect to the extracting member by tightening rotation of the screw shaft and elastically by a spring along with the downward movement. The shaft is biased to the side, and is held by the punch member. When the shaft moves downward, the tip of the shaft enters between the back surfaces, so that the tips are pushed out in opposite directions. A pair of claw members that bite and engage the inner periphery of the annular part from the side, and the downward movement of the shaft after the bite engagement of the pair of claw members is regulated, A stopper member configured to convert the tightening rotational force of the screw shaft into a pulling force of the punching member, and to lift the pair of claw members whose leading ends bite into and engage with the annular component; As the pair of claw members are raised, the holes are extracted from the holes.

  According to the present invention, the front ends of the pair of claw members are engaged and engaged from two sides opposite to the inner periphery of the annular part inserted and fixed in a hole such as a machine part. Since the annular part is pulled out from the hole, the annular part can be extracted from the hole even if there is no portion for hooking the annular part inserted and fixed in the hole.

It is a perspective view which shows the whole extraction device of the annular component which concerns on one Embodiment of this invention. It is a principal part expanded sectional view in FIG. It is a perspective view which takes out and shows the screw shaft, extraction member, and handle part in FIG. It is a perspective view which takes out and shows the extraction member in FIG. 1, FIG. It is a perspective view which takes out and shows the shaft in FIG. It is a perspective view which similarly takes out and shows a nail | claw member. It is a perspective view which similarly takes out and shows a coil spring. It is a perspective view which takes out and shows the extraction member holder in FIG. 1, FIG. It is a perspective view which similarly takes out and shows a positioning tool. FIGS. 3A and 3B are explanatory views at the start of extraction of the annular component shown in FIGS. 1 and 2, wherein FIG. It is explanatory drawing in the middle of extraction of an annular component same as the above, (a) is a perspective view which cuts and shows a part, (b) is sectional drawing. It is explanatory drawing at the time of extraction of an annular component same as the above, (a) is a perspective view which cuts and shows a part, (b) is sectional drawing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.
FIG. 1 is a perspective view showing an apparatus according to an embodiment of the present invention incorporated in a machine part 2 such as a machine part to which an annular part 1 (see FIG. 2) to be extracted is inserted and fixed, and FIG. It is an expanded sectional view of the principal part in FIG.
As shown in FIGS. 1 and 2, the apparatus for extracting an annular part according to an embodiment of the present invention relatively pulls up the extraction member 4 screwed with the screw shaft 3 by tightening rotation of the screw shaft 3. This is a device for extracting the annular part 1 that is inserted into and fixed to the hole 2a of the mechanical part 2 and, in particular, press-fitted and fixed.
In detail, the annular component 1 is press-fitted and fixed to the upper surface portion 2b of the step portion of the hole 2a of the mechanical component 2.
Examples of the machine part 2 include a cylinder head, a hole (a hole in which the annular part 1 is press-fitted and fixed) 2a of the machine part 2, an exhaust port or an intake port, and an annular part 1 that is a valve seat. .

In the embodiment shown in FIGS. 1 and 2, the device of the present invention includes a shaft 11, a pair of claw members 12 and 12, and a stopper member 13.
The shaft 11 has a rear end (upper end in the drawing) abutted on a tip (lower end in the drawing) of the screw shaft 3, and a tip end portion 11b has a tapered shape. The shaft 11 moves downward with respect to the extraction member 4 by the tightening rotation of the screw shaft 3 and is elastically biased toward the tip end side of the screw shaft 3 by the coil spring 14 with the downward movement. It is configured.
Here, a handle, which is a T-shaped handle 5 in the example shown in FIG. 1, is connected to the upper end of the screw shaft 3, and the screw shaft 3 can be easily rotated by turning the handle 5. is there.

The extraction member 4 is formed in a substantially rectangular parallelepiped shape, and a screw hole 4a into which the screw shaft 3 is screwed is formed with a predetermined length from substantially the center of the upper end surface to the lower side. A through hole 4b extending upward from the center and communicating with the screw hole 4a is formed. The through-hole 4b is formed in two steps having a large diameter at the upper part and a small diameter at the lower part, and the lower part is formed in a polygonal cross section, in the present embodiment, a hexagonal cross section.
On the inner wall surface near the lower end of the through hole 4b, a pair of through horizontal holes 4c and 4c are formed in different directions by 180 ° toward the side perpendicular to the central axis of the through hole 4b.
3 to 7 are views showing the above-mentioned members taken out. FIG. 3 shows the screw shaft 3, the extracting member 4 and the handle 5 part, FIG. 4 shows the extracting member 4, FIG. 5 shows the shaft 11, and FIG. 6 shows one claw member 12, and FIG. 7 shows a coil spring 14.

The shaft 11 is inserted into the screw hole 4a of the extraction member 4 from the upper end side, the tip 11e can reach the lower end surface of the extraction member 4 through the screw hole 4a and the through hole 4b, and the tip end portion is the extraction member. 4 has a cross-sectional shape slightly smaller than that of the through hole 4b, but a ring 11c is fitted and fixed near the rear end.
The reason why both the cross-sectional shape of the shaft 11 and the cross-sectional shape of the through hole 4b of the punching member 4 are formed in a polygonal shape is that the shaft 11 is not rotated in the direction around the central axis. This is because the surface 11d always faces toward the back surface portions 12b and 12b of the pair of claw members 12 and 12.

  The coil spring 14 is passed through the shaft 11, and is interposed between the ring 11 c of the shaft 11 and the step portion 4 d of the through hole 4 b of the extraction member 4 in the extraction member 4. The shaft 11 is urged toward the distal end side of the screw shaft 3 with the movement.

The pair of claw members 12 and 12 are inserted and held in the penetrating lateral hole 4c of the punching member 4 so as to be guided by the penetrating lateral hole 4c and move laterally.
The pair of claw members 12, 12 is a rear surface portion where the distal end portion 11 b of the shaft 11, specifically the pair of right and left tapered surfaces 11 d of the distal end portion 11 b, are opposed to each other by the downward movement of the shaft 11 relative to the extraction member 4. 12b and 12b are configured to be interrupted and entered. Then, due to the interrupted approach of the tip portion 11b of the shaft 11, the tip portions 12c (see FIG. 6) of the pair of claw members 12 and 12 are pushed out in opposite directions and are press-fitted and fixed in the holes 2a of the mechanical component 2. The part 1 is configured to bite into and engage with the inner periphery of the part 1, preferably the lower end edge part from both the left and right sides.

For example, each of the pair of claw members 12 and 12 is formed such that the distal end portion 12a is sharpened in a square shape or a reverse square shape at an acute angle or an angle close to an acute angle. This is to make it easier for the tip 12c (see FIG. 6) of the pair of claw members 12 and 12 to bite into the lower edge portion of the annular component 1. In addition, the pair of claw members 12 and 12 are formed so that each back surface portion 12b protrudes in an obtuse shape in a square shape or an inverted square shape and is directed back to back. This is because, together with the tapered shape of the tip portion 11 b of the shaft 11, the tip portion 11 b can be easily interrupted and entered between the opposing back surface portions 12 b and 12 b of the pair of claw members 12 and 12.
The pair of claw members 12 and 12 are inserted and held in the through-side horizontal hole 4c with a clearance fit so that no blurring or rattling occurs in the through-side horizontal hole 4c of the extraction member 4. In the present embodiment, the punching member 4 and the pair of claw members 12 and 12 are both made of iron-based metal, but are not limited thereto.
Further, the pair of claw members 12 and 12 are normally arranged such that the center position between the back surface portions 12b and 12b is aligned with the opening position on the lower end side of the through hole 4b of the shaft 11, and the front end portion 11b of the shaft 11 can be interrupted. The back portions 12b and 12b are opposed to each other, and each tip 12c (see FIG. 6) is configured to be held at a position that does not protrude from the outer peripheral surface of the extraction member 4.

The stopper member 13 regulates the downward movement of the shaft 11 after the pair of claw members 12 and 12 bite into and engage with the annular component 1. In this embodiment, the stopper member 15 will be described in detail later. It is arranged and fixed at the bottom of the.
The stopper member 13 converts the tightening rotational force of the screw shaft 3 after the restriction of the downward movement of the shaft 11, that is, after the tip 11 e of the shaft 11 comes into contact with the upper surface of the stopper member 13, into the lifting force of the extraction member 4. Each tip 12c (see FIG. 6) is engaged with the annular part 1 and is provided to raise the pair of claw members 12 and 12 engaged.
As the pair of claw members 12 and 12 are raised, the annular component 1 is extracted from the hole 2a of the mechanical component 2, more specifically from the stepped portion upper surface portion 2b of the hole 2a.

As shown in FIG. 8, the extraction member holding tool 15 that holds the extraction member 4 is configured integrally with a guide portion 15a, a stopper member fixing portion (bottom portion) 15b, and a rotation stopper portion 15c.
Here, the guide portion 15a is formed so that the extraction member 4 can be mounted so as to be movable up and down, and can be inserted into the hole 2a of the mechanical component 2 together with the stopper member fixing portion 15b. When the punching member 4 is mounted, the tip 12c (see FIG. 6) of the pair of claw members 12 and 12 held by the punching member 4 is press-fitted and fixed in the hole 2a. It is configured so that it can be guided to a position where it can bite into and engage with the lower edge portion from both the left and right sides.
When the extraction member 4 is mounted on the guide portion 15a, the outer shape of the cross-section of the guide portion 15a and the extraction member 4 is similar to the inner peripheral shape of the round hole 16a formed in the positioning tool 16. The diameter is set to be slightly smaller than the hole 16a. This is because the guide portion 15a and the extraction member 4 inserted into the round hole 16a do not cause blurring or rattling.

A notch 15 d is formed on the outer periphery of the rotation stopper 15 c of the punching member holder 15.
In order to prevent the extraction member holder 15 (extraction member 4) from rotating together with the rotation of the handle 5 (screw shaft 3), the notch 15d protrudes from the positioning tool 16 disposed on the machine component 2. The held holder positioning pin 16b is positioned.
Positioning holes 16c are formed in the positioning tool 16 at positions corresponding to rods 17 such as pins and bolts protruding from two spaced apart locations on the machine component 2 (see FIGS. 1 and 9). ). The positioning tool 16 is positioned on the machine component 2 by inserting a pair of rod-like bodies 17 into the pair of positioning holes 16c.
The round hole 16a in the center of the positioning tool 16 is drilled corresponding to the hole 2a of the machine part 2 into which the annular part 1 to be extracted is press-fitted and fixed, and the above-described extraction member holder 15 is inserted.
When the mechanical component 2 is a cylinder head, the hole 2a of the mechanical component 2 is an exhaust port or an intake port, and the annular component 1 is a valve seat, the rod-shaped body 17 is formed in a pair of cylinder head bolt holes. A positioning tool positioning pin to be inserted may be mentioned. If a pair of cylinder head bolts can be used, they may be used as positioning tool positioning pins.

The procedure for extracting the annular component 1 according to the present embodiment configured as described above will be described with reference to FIGS.
At the start of extraction of the annular part 1, each part of the apparatus is assembled to the machine part 2 as shown in FIGS. 10 (a) and 10 (b).
That is, first, a pair of rod-like bodies 17 (see FIG. 1) protruding from the machine part 2 are respectively inserted into a pair of positioning holes 16c (see FIGS. 1 and 9) drilled in the positioning tool 16, and the positioning tool 16 is inserted. Is positioned on the machine part 2.
Next, the extraction member holding tool 15 is inserted into the round hole 16a of the positioning tool 16 from the stopper member fixing portion 15b side. In this case, in the punching member holder 15, the holder positioning pin 16b projecting from the positioning tool 16 is positioned in the notch 15d formed in the rotation preventing portion 15c of the punching member holder 15, and the displacement movement in the direction around the axis is prevented. Be regulated.

The guide member 15a (see FIG. 8) of the punching member holder 15 positioned and inserted into the hole 2a of the mechanical component 2 is mounted with the punching member 4 in which the screw shaft 3 is screwed into the screw hole 4a. Is done.
As can be seen from FIGS. 10 (a) and 10 (b), at the start of the extraction operation of the annular component 1, the tip of the screw shaft 3 is in contact with the rear end of the shaft 11, but the tip 11b of the shaft 11 is a pair. The claw members 12 and 12 are not yet interrupted between the back surface portions 12b and 12b. Therefore, each tip 12 c (see FIG. 6) of the pair of claw members 12 and 12 is accommodated in the through lateral hole 4 c of the extraction member 4. Of course, the tip 11 e of the shaft 11 is not in contact with the stopper member 13.

10A and 10B, when the screw shaft 3 is tightened and rotated by turning the handle 5 (see FIG. 1), the tip of the screw shaft 3 is lowered and the tip of the screw shaft 3 by the coil spring 14 is lowered. The shaft 11 is pushed down against the urging force to the side. When the handle 5 is further rotated and the screw shaft 3 is tightened and rotated, the screw shaft 3 and the shaft 11 are further lowered, and the tip portion 11b of the shaft 11 enters an interrupt between the back portions 12b and 12b of the pair of claw members 12 and 12. [Refer to arrows A and B in FIG. 11A].
Then, the front ends 12c (see FIG. 6) of the pair of claw members 12 and 12 are pushed out in opposite directions, and protruded from the opening surface of the through horizontal hole 4c of the extraction member 4, that is, the outer peripheral surface of the extraction member 4. 11 (a) arrow C]]. 11 (a) and 11 (b), when the tip 11e of the shaft 11 is lowered to a position where it abuts against the upper surface of the stopper member 13, the tips 12c of the pair of claw members 12 and 12 (FIG. 6). (See) bites and engages the lower end edge portion (or its peripheral portion) of the annular component 1 press-fitted into the hole 2a of the mechanical component 2 from both the left and right sides.

When the handle 5 (see FIG. 1) is further turned to rotate the screw shaft 3 from the state shown in FIGS. 11 (a) and 11 (b), the tip 11e of the shaft 11 is moved to the upper surface of the stopper member 13. Since the movement to the lower side is restricted by contact with this, it will not descend any further. On the other hand, the screw shaft 3 is screwed into the screw hole 4a of the extraction member 4 that is movable up and down, and the downward movement is restricted by the stopper member 13 as described above.
Therefore, the stopper member 13 has a higher pulling force of the extraction member 4 with respect to the tightening rotational force of the handle 5 (see FIG. 1) and the screw shaft 3 after the tip 11e of the shaft 11 abuts against the stopper member 13. To function as a switch. As a result, after the tip 11e of the shaft 11 abuts against the stopper member 13, when the handle 5 (see FIG. 1) and the screw shaft 3 are further tightened and rotated, as shown in FIGS. The member 4 is lifted and raised [see arrows D and E in FIG. 12 (a)].
Accordingly, the pair of claw members 12 and 12 held by the punching member 4 also rises in a state in which each tip 12c (see FIG. 6) bites into and engages with the lower end edge portion of the annular part 1, and the annular part 1 Is extracted from the hole 2a.

As described above, in the present embodiment, the annular component 1 is press-fitted and fixed in the hole 2a of the mechanical component 2 by relatively pulling up the extraction member 4 screwed into the screw shaft 3 by tightening rotation of the screw shaft 3. In the apparatus for extracting, the following configuration was adopted.
That is, by rotating and tightening the screw shaft 3, the tips 12c (see FIG. 6) of the pair of claw members 12 and 12 are inserted into the inner periphery of the annular part 1 press-fitted into the hole 2a of the machine part 2 from both the left and right sides. The bite is engaged (see FIGS. 10 and 11). Then, the pair of claw members 12 and 12 are lifted while the tips 12c (see FIG. 6) of the pair of claw members 12 and 12 are engaged with and engaged with the annular part 1, and the annular part 1 is machined. It was configured to be extracted from the hole 2a of the component 2 (see FIG. 12).
According to this, even if there is no portion for hooking the annular component 1 press-fitted and fixed in the hole 2a of the mechanical component 2, the annular component 1 can be extracted from the hole 2a.
Thereafter, by holding the handle 5 (see FIG. 1), the screw shaft 3 and the extraction member 4 (the pair of claw members 12 and 12) are lifted together with, for example, the extraction member holder 15 and the positioning tool 16, thereby The annular part 1 can be taken out from the part 2.

Further, according to the present embodiment, from the start of the extraction work of the annular part 1 to the extraction can be performed only by rotating the screw shaft 3 (handle 5) in one direction, that is, by tightening rotation, the extraction work of the annular part 1 can be performed. It will be easy.
Further, the lowering of the shaft 11 for biting and engaging each tip 12c (see FIG. 6) of the pair of claw members 12 and 12 into the inner periphery of the annular component 1 is lowered by the rotation of the screw shaft 3. To do so. According to this, even if the operator changes, the amount of protrusion of the pair of claw members 12 and 12 is constant, the deformation of the annular part 1 can be suppressed, that is, the above biting engagement can be surely performed, and The bite engagement can be performed with a small force.
Further, as the shaft 11 is moved downward, the shaft 11 is biased toward the tip end side (handle 5 side) of the screw shaft 3, so that the shaft 11 is moved by substantially equal pressing force regardless of the operator. It can be moved downward. Accordingly, it is possible to prevent the operator from varying the degree of biting when the tips 12c (see FIG. 6) of the pair of claw members 12 and 12 bite into and engage with the inner periphery of the annular component 1.

  1: annular part, 2a: hole, 3: screw shaft, 4: removal member, 11: shaft, 11b: tip of shaft, 14: coil spring, 12: claw member, 12c: tip of claw member, 13: stopper member .

Claims (1)

In the extracting device for the annular component, by pulling up the extracting member that is screwed with the screw shaft relatively by the tightening rotation of the screw shaft, and extracting the annular component that is inserted and fixed in the hole,
A shaft that has a tapered tip, moves downward with respect to the extraction member by tightening rotation of the screw shaft, and is elastically biased toward the tip of the screw shaft by a spring along with the downward movement. When,
The tip of the shaft is held between the back portions by the downward movement of the shaft held by the punching member, and the tips are pushed out in opposite directions to the inner periphery of the annular component. A pair of claw members that bite and engage from one side;
The pair of claw members regulates the downward movement of the shaft after the bite engagement, converts the tightening rotational force of the screw shaft after the regulation into the lifting force of the punch member, Comprising a stopper member for raising the pair of claw members engaged by biting,
The annular component extraction device, wherein the annular component is extracted from the hole as the pair of claw members rise.

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