JP2011158055A - Positioning pin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve accuracy of a positioning pin for positioning pin holes formed in two members and put in communication in series so that they are positioned coaxially through such a procedure that the pin is inserted through the pin holes. <P>SOLUTION: The positioning pin 1 positions the pin holes H1 and H2 formed in the two members M1 and M2 and put in communication in series so that they are positioned coaxially through such a procedure that the pin is inserted through the pin holes H1 and H2. The pin 1 is equipped with a pin body 2 deformable elastically to the outer diameter enlarged side, a first and second taper holes 5 and 6 formed in the pin body 2 in such a way as mating with the two pin holes H1 and H2 in series arrangement, in which the inner surfaces are tapered, a first and second taper sleeves 7 and 8 to be fitted internally to the first and second holes 5 and 6, and a screw shaft member 9 which has a first threaded shaft portion 23 inserted into the two taper sleeves 7 and 8 in tight attachment and engaged by threads with at least one taper sleeve 8 and can enlarge the outer diameter of the pin body 2 through the two taper sleeves 7 and 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a positioning pin, and in particular, the upper half portion and the lower half portion of the pin body are elastically moved toward the outer diameter expansion side in order to fit in two pin holes in series and make the pin holes coaxial. The present invention relates to a deformable positioning pin.

  Conventionally, when two structural members of a plurality of structural members of various mechanical devices are precisely positioned and coupled, pin holes formed in the two structural members are connected in series, and circularly connected to the pin holes. Techniques for inserting columnar pins are widely used. In many cases, a plurality of sets of serial pin holes are provided and positioned by a plurality of pins. In addition, said pin is employ | adopted not only for the structural member of a mechanical apparatus but in positioning various members and components.

A conventional general pin is a solid cylindrical pin. Although this solid pin is forcibly inserted into the pin hole, it is desirable to make the minute gap between the pin and the peripheral surface of the pin hole zero, but if you try to make that gap zero, the pin is inserted into the pin hole. It becomes impossible to insert. Therefore, a minute gap of several μm exists between the peripheral surface of the pin and the pin hole, which causes a decrease in positioning accuracy.
In addition, the diameter of the two pin holes in series is not completely the same, and a pin having a diameter suitable for a pin hole having a small diameter is employed. In this case, a minute gap between the peripheral surface of the pin hole having a large diameter and the pin becomes large, and the positioning accuracy is lowered.

  Therefore, it is a positioning pin with a composite structure, in which a cylindrical pin body is configured to be elastically deformable toward the outer diameter expansion side, and a diameter expansion mechanism capable of expanding the outer diameter is incorporated inside the pin body. A pin has been proposed.

For example, in the positioning fixed plug (positioning pin) of Patent Document 1, a bush having a tapered hole inside and capable of being elastically deformed toward the outer diameter expansion side, a truncated cone inserted into the bush, and an upper side of the truncated cone And a bolt member that is screwed together and locked at the upper end of the bush.
When positioning the two members, insert the fixed plug into the two pin holes communicated in series and tighten the bolt member to drive the truncated cone to the smaller diameter side of the tapered hole. Thus, the bush is elastically deformed in the direction of expanding the outer diameter, and the two pin holes are aligned coaxially to position the two members.

On the other hand, a positioning pin as shown in FIG. 13 is put into practical use and sold.
The positioning pin 100 includes a first diameter expansion mechanism 103 and a second diameter expansion mechanism 104 therein. The first diameter expansion mechanism 103 includes a cylindrical pin main body 101, a steel ball 105 brought into contact with the lower tapered surface 101 a in the pin main body 101, and a pressing member 106 that presses the steel ball 105. The second diameter expansion mechanism 104 includes a screw member 107 that is in contact with the upper tapered surface 101 b in the pin main body 101.

When positioning the two members, first, in the first diameter expanding mechanism 103, the pressing member 106 is tightened and driven to press the steel ball 105 downward, so that the pin main body 101 has a lower taper surface 101a. The lower part is elastically deformed in the direction of expanding the outer diameter and is brought into close contact with the pin hole H1.
Next, in the second diameter expansion mechanism 104, the screw member 107 is tightened and driven to elastically deform the upper portion of the pin main body 101 in the outer diameter expansion direction via the upper taper surface 101b and closely contact the pin hole H2. . Thus, the two members M1 and M2 are positioned.

JP-A-62-194015

  In the positioning and fixing plug of Patent Document 1, since the entire bush is elastically deformed to the outer diameter expansion side by a set of diameter expansion mechanisms, when the pin hole diameters are not equal, the bushing is closely attached to the small diameter pin hole. Since the diameter is expanded to the state, the degree of adhesion to a pin hole having a large diameter is weakened, and there is a limit to increasing the positioning accuracy.

  On the other hand, in the positioning pin shown in FIG. 13, when the positioning pin is mounted, the rotation operation for removing the screw member, the rotation operation for tightening the pressing member, and the rotation for tightening the screw member are performed three times. Since a dynamic operation is required, there is a problem that the operation time becomes long.

  Moreover, in the first diameter expansion mechanism that expands the diameter of the lower portion of the pin body, since the pin body has a structure that expands the diameter through line contact between the steel ball and the taper surface of the pin body, a positioning pin is incorporated. If the mechanical vibration repeatedly propagates to the lower part of the pin body while using the machine for a long time, the contact part of the tapered surface that is in line contact with the steel ball is plastic in an indented shape. Since it deforms and loses its diameter expansion function, there is a problem that the positioning accuracy by the positioning pin is remarkably lowered, that is, the durability is insufficient.

  An object of the present invention is to provide a positioning pin that can be easily positioned with high accuracy, to provide a positioning pin that can be positioned reliably even when the diameters of two pin holes are slightly different, and to have excellent durability. Providing a locating pin, and so on.

  The positioning pin according to claim 1 is a positioning pin that is inserted into two pin holes formed in two members and communicated in series and positions the pin holes so as to be coaxial with each other. An elastically deformable pin body, first and second tapered holes formed in series so as to correspond to the two pin holes in the pin body and tapered inside, and the first and second tapered holes The first and second taper sleeves engaged with each other, the first screw shaft portion inserted into the first and second taper sleeves and screwed into at least one taper sleeve, and the first and first taper sleeves. And a bolt member capable of enlarging the outer diameter of the pin body through a two-taper sleeve.

  When positioning with this positioning pin, when the positioning pin is inserted into the two pin holes and the bolt member is driven to the tightening side, at least one taper sleeve is driven to move in the axial direction by the first screw shaft portion of the bolt member. Thus, the first and second taper sleeves are respectively moved to the smaller diameter side of the first and second taper holes, and one of the pin bodies corresponding to the two pin holes is passed through the first and second taper sleeves. Half (upper part) and the other half (lower part) can be elastically deformed to the outer diameter expansion side, and the pin body can be brought into close contact with the inner surfaces of the two pin holes.

  According to a second aspect of the present invention, in the positioning pin of the first aspect, each of the first and second tapered holes is a tapered hole whose diameter is reduced toward the intermediate portion in the length direction of the pin body or the vicinity thereof. The bolt member has a head, a first shaft extending from the head, and a second shaft extending integrally from the tip of the first shaft to the side opposite to the head. The second shaft portion is formed on the first screw shaft portion.

  According to a third aspect of the present invention, in the positioning pin of the second aspect, the first and second shaft portions are fitted into the first and second taper sleeves, and the first taper sleeve is a head of the bolt member. And a stop ring mechanism attached to the bolt member, so that it does not move in the axial direction relative to the first shaft portion, and the outer peripheral portion of the outer surface of the head portion of the bolt member can be received by the pin body The first stop ring and the first rotation restricting pin for restricting the rotation of the second taper sleeve are provided.

  According to a fourth aspect of the present invention, in the positioning pin of the first aspect, the first and second tapered holes are formed as tapered holes having a diameter increasing toward the distal end portion in the length direction of the pin body, and the bolt member is A head, a third shaft extending from the head, and a fourth shaft extending integrally from the tip of the third shaft to the opposite side of the head. A second screw shaft portion formed on the first screw shaft portion and screwed on the first taper sleeve is formed on the third shaft portion.

  According to a fifth aspect of the present invention, in the positioning pin according to the fourth aspect, the third and fourth shaft portions are inserted into the first and second tapered sleeves, respectively, and the third shaft portion is connected to the pin body. A plurality of disc springs for receiving the head of the bolt member, and a second stop ring capable of receiving the outer peripheral portion of the outer surface of the head of the bolt member and the first and second taper sleeves on the pin body. The second and third rotation restricting pins for restricting the rotation of the rotation are provided.

  The positioning pin of claim 6 is the invention of claim 5, wherein the inclination angle of the second taper hole is set larger than the inclination angle of the first taper hole, and the screw pitch of the second screw shaft portion is It is characterized in that it is set to be larger than the screw pitch of the first screw shaft portion.

  According to the positioning pin of the first aspect of the present invention, one half and the other half of the pin body corresponding to the two pin holes are independently expanded in diameter through the bolt member and the first and second tapered sleeves. It can be brought into close contact with the inner surface of one pin hole. Therefore, even if the diameters of the two pin holes are slightly different, the pin body can be securely attached to the inner surface of the two pin holes, so the two pin holes are aligned coaxially and positioned with high accuracy. can do.

When the positioning pin is mounted, it can be mounted only by tightening the bolt member once, so that it can be easily mounted in a short time.
Moreover, since the first and second taper sleeves are structured to engage the first and second taper holes by surface contact, even if mechanical vibrations repeatedly act over a long period of use, their contact portions Therefore, the outer diameter expansion function is maintained over a long period of time, and the durability is excellent.

  According to the invention of claim 2, since the first and second tapered holes are reduced in diameter toward the intermediate portion in the length direction of the pin body or the vicinity thereof, the thickness portion of the pin body is reduced. Can be reduced in weight. Further, since the second shaft portion having a small diameter of the bolt member is formed on the first screw shaft portion, the manufacturing cost of the first screw shaft portion can be reduced.

  According to the invention of claim 3, when tightening the bolt member, the head portion of the bolt member pushes the first taper sleeve toward the smaller diameter side of the first taper hole, and when loosening the bolt member, the stop ring mechanism is used. The second taper sleeve can be driven to the large diameter side of the second taper hole while the first taper sleeve is pushed to the large diameter side of the first taper hole and the head of the bolt member is received by the first stop ring. . When rotating the bolt member, the rotation of the second taper sleeve can be restricted by the first rotation restriction pin.

  According to the invention of claim 4, the first and second taper holes are formed in a taper hole that increases in diameter toward the distal end portion in the length direction of the pin body, and the second screw is formed on the third shaft portion of the bolt member. Since the shaft portion is formed and the first screw shaft portion is formed on the fourth shaft portion and the second and first screw shaft portions are screwed to the first and second taper sleeves, the bolt member is rotated to the tightening side. As a result, the first and second taper sleeves move to the smaller diameter side of the first and second taper holes and engage in close contact, and one half and the other half of the pin body (the upper half and the lower half) Part) is elastically deformed to the outer diameter expansion side and engages closely with the two pin holes. When the bolt member is loosened, the first and second tapered sleeves move in the opposite direction, and the pin main body is elastically deformed toward the outer diameter reducing side.

  According to the invention of claim 5, when the bolt member is driven to the tightening side, the plurality of disc springs are bolts until the first and second taper sleeves are in close contact with the first and second taper holes. When restricting the movement of the member and loosening the bolt member, the bolt member is urged by a plurality of disc springs and received by the second stop ring, and the first and second tapered sleeves are smoothly driven in the loosening direction. Is done.

  According to the invention of claim 6, the inclination angle of the second taper hole is set to be larger than the inclination angle of the first taper hole, and the screw pitch of the second screw shaft portion is set to be the screw pitch of the first screw shaft portion. Since the pitch is set larger than the pitch, when the bolt member is tightened, the second taper sleeve can be brought into close contact with the second taper hole, and then the first taper sleeve can be brought into close contact with the first taper hole.

It is a perspective view of the positioning pin of Example 1 of this invention. It is a top view of a positioning pin. It is sectional drawing of the positioning pin of the state inserted in two pin holes. FIG. 4 is a cross-sectional view of a state in which a bolt member is tightened from the state of FIG. 3 and a lower half portion of a positioning pin is engaged closely with a pin hole. FIG. 5 is a cross-sectional view taken along line VV in FIG. 2 in a state in which the bolt member is further tightened from the state of FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 2 in the same state as FIG. 5. It is a perspective view of the positioning pin of Example 2. FIG. It is a top view of a positioning pin. It is sectional drawing of the positioning pin of the state inserted in two pin holes. FIG. 10 is a cross-sectional view of a state where the bolt member is tightened from the state of FIG. 9 and the lower half of the positioning pin is engaged with the pin hole in a close contact state. FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 8 in a state in which the bolt member is further tightened from the state of FIG. 10 and the upper half of the positioning pin is engaged in close contact with the pin hole. It is the XII-XII sectional view taken on the line of FIG. 8 in the same state as FIG. It is sectional drawing of the positioning pin which concerns on a prior art.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

First, the overall configuration of the positioning pin 1 will be described.
As shown in FIGS. 1 to 6, the positioning pin 1 is inserted into two pin holes H1 and H2 having the same diameter or substantially the same diameter formed in the two members M1 and M2 and communicated in series. The pin holes H1 and H2 are positioned so as to be coaxial. An annular receiving portion Ha capable of receiving the lower end portion of the positioning pin 1 is formed in the middle portion of the lower pin hole H2 (see FIGS. 3 to 6).

  The two members M1 and M2 are constituent members that constitute some mechanical device. However, the two members M1 and M2 may be a base member on the mechanical device side and a movable member that is positioned and fixed to the base member.

  The positioning pin 1 includes a steel pin body 2 inserted into the two pin holes H1 and H2, first and second tapered holes 5 and 6 formed in the pin body 2, and the first and second tapers. Steel first and second taper sleeves 7 and 8 engaged with the holes 5 and 6 and steel bolt members 9 inserted into the first and second taper sleeves 7 and 8 are provided.

Next, the pin body 2 will be described.
As shown in FIGS. 1-6, the pin main body 2 is a sleeve-shaped member which has a cylindrical external shape. However, the outer shape of the upper end portion of the pin body 2 is formed on a tapered surface 2a that decreases in diameter toward the upper end, and the outer shape of the lower end portion of the pin body 2 is formed on a tapered surface 2b that decreases in diameter toward the lower end. ing.

  The pin body 2 has tapered first and second tapered holes 5 and 6, a plurality of slits 13 and 14, and the like. The pin body 2 can be elastically deformed toward the diameter expansion side via the plurality of slits 13 and 14. The pin body 2 is configured to be insertable with a minute gap between the pin holes H1 and H2, and the outer diameter of the pin body 2 is slightly smaller than the inner diameter of the pin holes H1 and H2.

  As shown in FIGS. 1 and 2, the lengths of the slits 13 and 14 are about 80 to 85% of the total length of the pin body 2. Four upper slits 13 with an open upper end are formed at equal intervals in the circumferential direction on the outer periphery of the pin body 2, and four lower slits are opened so as to be positioned between the four upper slits 13. Lower slits 14 are formed at equal intervals in the circumferential direction. These slits 13 and 14 enable elastic deformation of the pin body 2 in the direction in which the outer diameter of the pin body 2 is enlarged. A wide portion 14a with an enlarged groove width is formed at the lower portion of one lower slit 14 to restrict movement in the circumferential direction of a first rotation regulating pin 19 described later and allow movement in the vertical direction. Yes.

Next, the first and second tapered holes 5 and 6 will be described.
As shown in FIGS. 3 to 6, a short cylindrical surface 4 is formed in an intermediate portion in the longitudinal direction of the inside of the pin body 2 or in the vicinity thereof, and the first and second tapered holes 5 and 6 The diameter of the main body 2 is reduced toward the middle portion in the length direction or the vicinity thereof, and the end portion of the cylindrical surface 4 is continued. The first and second tapered holes 5 and 6 are formed in series so as to correspond to the two pin holes H1 and H2.

  The first taper hole 5 is formed in the upper half of the pin body 2, and the second taper hole 6 is formed in the lower half of the pin body 2. The lengths of the first and second tapered holes 5 and 6 in the axial direction are formed to be substantially the same length. A cylindrical accommodation hole 12 that accommodates the head 20 of the bolt member 9 is formed above the first taper hole 5 so as to be smoothly connected to the upper end of the first taper hole 5.

  As shown in FIGS. 3 to 6, a stop ring 16 (first stop ring) capable of receiving the outer peripheral portion of the outer surface of the head portion 20 of the bolt member 9 is mounted inside the upper end portion of the pin body 2. . A stop ring 17 capable of receiving the lower end portion of the second taper sleeve 8 is mounted inside the lower end portion of the pin body 2.

Next, the first and second tapered sleeves 7 and 8 will be described.
As shown in FIGS. 3 to 6, the first and second taper sleeves 7 and 8 are respectively attached to the first and second taper holes 5 and 6 and engaged with each other by surface contact. The first taper sleeve 7 is formed with a taper outer peripheral surface 7a that decreases in diameter toward the lower side. When the first taper sleeve 7 is driven to move downward, the first taper sleeve 7 is brought into close contact with the inner surface of the first taper hole 5 to expand the upper half of the pin body 2. The second taper sleeve 8 is formed with a taper outer peripheral surface 8a that decreases in diameter upward. When the taper sleeve 8 is driven to move upward, the taper sleeve 8 is brought into close contact with the inner surface of the second taper hole 6 to expand the diameter of the lower half of the pin body 2.

  The second taper sleeve 8 is provided with a first rotation restricting pin 19 for restricting its rotation. One end portion of the first rotation restricting pin 19 is inserted and fixed in the pin hole of the second taper sleeve 8, and the other end portion of the first rotation restricting pin 19 is inserted into the wide portion 14a of the slit 14 so as to be vertically movable. Yes.

Next, the bolt member 9 will be described.
As shown in FIGS. 1 to 6, the bolt member 9 is for moving and driving the taper sleeves 7 and 8 in the axial direction. The bolt member 9 is integrally formed from the head 20, a first shaft portion 21 extending downward from the head 20, and a tip portion (lower end) of the first shaft portion 21 to the side opposite to the head 20 (downward). And a second shaft portion 22 having a smaller diameter than the first shaft portion 21. The outer peripheral surface of the first shaft portion 21 is formed in a cylindrical surface and is inserted into the shaft hole of the first taper sleeve 7 in a close contact manner. The second shaft portion 22 is formed on the first screw shaft portion 23 and is screwed into the screw hole of the second taper sleeve 8.

Since the axial length of the accommodating hole 12 that accommodates the head portion 20 of the bolt member 9 is slightly larger than the axial length of the head portion 20, the head portion 20 moves vertically in the accommodating hole 12. It can move only a short distance. A hexagon hole 20a for engaging a hexagon wrench for rotating the bolt member 9 is formed at the center of the upper end of the head 20.
The length of the first shaft portion 21 is set substantially equal to the lengths of the first taper sleeve 7 and the first taper hole 5. The second shaft portion 22 is set longer than the length of the second taper sleeve 8.

  A stop ring mechanism 25 is attached to the upper end portion of the second shaft portion 22. The stop ring mechanism 25 includes an annular receiving ring 26 that receives the lower end portion of the first tapered sleeve 7 and an annular support ring 27 that supports the lower surface of the annular receiving ring 26. The annular support ring 27 is a ring similar to the stop ring. The first taper sleeve 7 is restricted by the head 20 of the bolt member 9 and the stop ring mechanism 25 from moving in the axial direction with respect to the first shaft portion 21.

Next, the operation of the positioning pin 1 will be described.
As shown in FIG. 3, in the initial state before using the positioning pin 1, the bolt member 9 is positioned at the upper limit position (the head 20 is close to or in contact with the stop ring 16), and the first taper sleeve 7 is also positioned at the upper limit. The second taper sleeve 8 is in the lower limit position (the lower end is close to or in contact with the stop ring 17). When the initial positioning pin 1 is inserted into the two pin holes H1 and H2 of the two members M1 and M2, the lower end portion of the pin body 2 is received by the annular receiving portion Ha of the pin hole H1.

  Next, when the hexagonal wrench is engaged with the hexagonal hole 20a of the bolt member 9 and the bolt member 9 is rotated in the tightening direction by the hexagonal wrench, the rotation of the second taper sleeve 8 is regulated by the first rotation regulating pin 19. Therefore, as shown in FIG. 4, the second taper sleeve 8 moves upward, and the tapered outer peripheral surface 8 a engages closely with the inner surface of the second taper hole 6, so that the lower half of the pin body 2 is engaged. The portion is elastically deformed in the direction of expanding the outer diameter, and engages closely with the pin hole H2. When the bolt member 9 is tightened, the second taper sleeve 8 rises, and when a certain amount of frictional force is generated between the second taper sleeve 8 and the second taper hole 6, the second taper sleeve 8 rises in parallel. The bolt member 9 and the first taper sleeve 7 start to descend.

  When the bolt member 9 is further tightened, as shown in FIGS. 5 and 6, the bolt member 9 and the first taper sleeve 7 move downward, and the taper outer peripheral surface 7 a of the first taper sleeve 7 is formed in the first taper hole 5. The upper half of the pin body 2 is elastically deformed in the direction of expanding the outer diameter, and is engaged in close contact with the pin hole H1. In this way, the pin holes H1 and H2 of the two members M1 and M2 can be aligned and positioned coaxially.

  When the positioning pin 1 is removed from the pin holes H1 and H2, when the bolt member 9 is rotated in the loosening direction, the second is changed according to the magnitude of the frictional force acting on the first and second taper sleeves 7 and 8. There are cases where the taper sleeve 8 moves first and cases where the first taper sleeve 7 moves first. When the second taper sleeve 8 moves first, the second taper sleeve 8 is in the lower limit position (abuts against the stop ring 17), and then the bolt member 9 and the first taper sleeve 7 are in the upper limit position (stop ring). 16) and the positioning pin 1 is disengaged (initial state).

Next, the effect of the positioning pin 1 will be described.
Two lower and upper half portions of the pin body 2 corresponding to the two pin holes H1 and H2 via the bolt member 9 and the first and second taper sleeves 7 and 8 are independently extended in the outer diameter increasing direction. It can be elastically deformed and brought into close contact with the inner surfaces of the two pin holes H1, H2. Therefore, even when the diameters of the two pin holes H1 and H2 are slightly different, the pin body 2 can be securely adhered to the inner surfaces of the two pin holes H1 and H2. It can be positioned with high accuracy by being aligned with the coaxial core.

When the positioning pin 1 is mounted, the bolt member 9 can be mounted by one rotation operation, so that it can be easily mounted in a short time.
Moreover, since the first and second taper sleeves 7 and 8 are structured to engage the first and second taper holes 5 and 6 by surface contact, mechanical vibrations repeatedly act over a long period of use. However, since plastic deformation does not occur in those contact portions, the function of expanding the outer diameter is maintained for a long period of time, and the durability is excellent.

  Since the first and second tapered holes 5 and 6 are reduced in diameter toward the intermediate portion in the length direction of the pin body 2 or the vicinity thereof, the thickness of the pin body 2 is reduced and the weight is reduced. I can. Further, since the second shaft portion 22 having a small diameter of the bolt member 9 is formed on the first screw shaft portion 23, the manufacturing cost of the first screw shaft portion 23 can be reduced.

  When tightening the bolt member 9, the head 20 of the bolt member 9 pushes the first taper sleeve 7 toward the small diameter side of the first taper hole H1, and when loosening the bolt member 9, the stop ring mechanism 25 first The taper sleeve 7 is pushed toward the large diameter side of the first taper hole H1, and the second taper sleeve 8 is moved to the large size of the second taper hole 6 while the head 20 of the bolt member 9 is received by the first stop ring 16. Can be driven to the radial side. When rotating the bolt member 9, the rotation of the second taper sleeve 8 can be restricted by the first rotation restriction pin 19.

Next, the positioning pin 1A of Example 2 will be described. However, the same components as those in the first embodiment will be described with the same reference numerals.
As shown in FIGS. 7 to 12, the positioning pin 1A includes a steel pin body 2A inserted into two pin holes H1 and H2 communicated in series, and the two pin holes H1 in the pin body 2A. , H2 formed in series so as to correspond to H2, first and second tapered holes 5A, 6A, and first and second tapered sleeves made of steel engaged with the first and second tapered holes 5A, 6A 7A, 8A, and steel bolt members 9A inserted into the first and second tapered sleeves 7A, 8A.

Next, the pin body 2A will be described.
As shown in FIGS. 7 to 12, the pin body 2A is a sleeve-like member having a cylindrical outer shape. The pin body 2A is configured to be inserted with a slight gap between the pin holes H1 and H2, and the outer diameter of the pin body 2A is such that the pin body 2A can be inserted into the pin holes H1 and H2. It is slightly smaller than the inner diameter of the holes H1 and H2. A plurality of slits 13A and 14A are formed in the pin main body 2A as in the first embodiment, and the pin main body 2A can be elastically deformed toward the outer diameter increasing side via the plurality of slits 13A and 14A. However, the outer shape of the upper end portion of the pin body 2 is formed on a tapered surface 2a that decreases in diameter toward the upper end, and the outer shape of the lower end portion of the pin body 2 is formed on a tapered surface 2b that decreases in diameter toward the lower end. ing.

Next, the first and second tapered holes 5A and 6A will be described.
As shown in FIGS. 9 to 12, the first taper hole 5A is formed in an intermediate portion in the axial direction in the pin body 2A, and the second taper hole 6A is formed in the lower end side portion in the pin body 2A. ing. The first and second taper holes 5A and 6A are formed so as to increase in diameter toward the tip (lower end) of the pin body 2A, and the inclination angle of the second taper hole 6A with respect to the vertical direction is the first taper hole 5A. It is set larger than the inclination angle with respect to the vertical direction. This is because the diameter of the second taper sleeve 8A is expanded before the first taper sleeve 7A.

  A cylindrical accommodation hole 12A that accommodates the head 20A of the bolt member 9A and the plurality of disc springs 38 is formed above the first tapered hole 5A in the pin body 2A. An upward horizontal annular surface 12a is formed at the boundary between the accommodation hole 12A and the first taper hole 5A. The length of the first taper hole 5A in the axial direction is longer than the length of the second taper hole 6A in the axial direction.

  One lower slit 14A is formed in a wide slit 14b having an enlarged groove width, and the wide slit 14b regulates the movement of the second and third rotation regulating pins 32 and 33 in the circumferential direction and in the vertical direction. Is allowed to move. As shown in FIGS. 9-12, the stop ring 16A (2nd stop ring) which can receive the outer peripheral part of the outer surface of the head 20A of the bolt member 9A is provided in the upper end part in the pin main body 2A.

Next, the first and second tapered sleeves 7A and 8A will be described.
As shown in FIGS. 9 to 12, the first taper sleeve 7 </ b> A is formed with a taper outer peripheral surface 7 b that increases in diameter downward. The second taper sleeve 8A is formed with a taper outer peripheral surface 8b that increases in diameter downward. The first and second taper sleeves 7A and 8A are engaged with the first and second taper holes 5A and 6A, respectively, by surface contact in an inner fitting manner.

  The first and second taper sleeves 7A and 8A are provided with second and third rotation restricting pins 32 and 33 for restricting their rotation, respectively. One end portions of the rotation restricting pins 32 and 33 are inserted and fixed in the pin holes 7c and 8c of the first and second taper sleeves 7 and 8, respectively, and the other end portions of the rotation restricting pins 32 and 33 are respectively inserted into the wide slits 14b. Has been inserted.

Next, the bolt member 9A and the disc spring 38 will be described.
As shown in FIGS. 7 to 12, the bolt member 9 </ b> A includes a head portion 20 </ b> A, a third shaft portion 35 extending downward from the head portion 20 </ b> A, and a head portion 20 </ b> A from the tip (lower end) of the third shaft portion 35. And a fourth shaft portion 36 that extends integrally to the opposite side (downward) and has a smaller diameter than the third shaft portion 35. The fourth shaft portion 36 is formed in the first screw shaft portion 23 </ b> A, and the lower portion of about 2/3 of the third shaft portion 35 is formed in the second screw shaft portion 24. The second screw shaft portion 24 is screwed to the first taper sleeve 7A, and the first screw shaft portion 23A is screwed to the second taper sleeve 8A.

  The length of the third shaft portion 35 is set to about twice the length of the fourth shaft portion 36. The pitch of the screws of the second screw shaft portion 24 is formed larger than the pitch of the screws of the first screw shaft portion 23A.

  The outer peripheral surface of the upper third portion of the third shaft portion 35 is formed into a cylindrical surface. The head 20A of the bolt member 9A is accommodated in the upper part of the accommodation hole 12A. Between the head portion 20A of the bolt member 9A and the annular surface 12a, a plurality of disc springs 38 are externally mounted on the upper portion of about 1/3 of the third shaft portion 35. Between the disc springs 38 and the annular surface 12a, the third shaft portion 35 is covered with a low friction washer member 11 such as stainless steel or brass. The bolt member 9A is regulated to move up and down by a small distance between the stop ring 16A and the plurality of disc springs 38.

Next, the operation of the positioning pin 1A will be described.
In the initial state before using the positioning pin 1A, as shown in FIG. 9, the bolt member 9A is located at the upper limit position (the head 20A is close to or in contact with the stop ring 16A), and the first taper sleeve 7A is at the lower limit. The second taper sleeve 8A is in the lower limit position. When the initial positioning pin 1A is inserted into the two pin holes H1 and H2 of the two members M1 and M2, the lower end portion of the pin body 2A is received by the annular receiving portion Ha of the pin hole H1.

  Next, when the hexagon wrench is engaged with the hexagon hole 20a of the bolt member 9A and is rotated in the direction in which the bolt member 9A is tightened by the hexagon wrench, as shown in FIG. 10, the first and second taper sleeves 7A, 8A are obtained. Moves upward. At this time, since the screw pitch of the second screw shaft portion 24 is set to be larger than the screw pitch of the first screw shaft portion 23A, the moving speed of the first taper sleeve 7A is the same as that of the second taper sleeve 8A. It becomes larger than the moving speed.

  However, since the inclination angle of the taper outer peripheral surface 8b of the second taper sleeve 8A with respect to the vertical is larger than the inclination angle of the first taper sleeve 7A, the second taper sleeve 8A is first brought into close contact with the second taper hole 8A. The lower half of the pin body 2A engages closely with the pin hole H1 through elastic deformation in the direction of expanding the outer diameter.

  Thereafter, when the bolt member 9A is further tightened, the first taper sleeve 7A moves upward while the bolt member 9A slightly moves downward relative to the second taper sleeve 8A as shown in FIGS. Thus, the upper half of the pin main body 2A is elastically deformed in the direction of expanding the outer diameter, and is engaged in close contact with the pin hole H1. Thus, the plurality of disc springs 38 are in a compressed state, and the two pin holes H1 and H2 of the two members M1 and M2 can be aligned and positioned coaxially.

  Thereafter, when removing the positioning pin 1A, when the bolt member 9A is rotated in the loosening direction, the bolt member 9A comes into contact with the stop ring 16A by the biasing force of the plurality of disc springs 38, and the first and second taper sleeves 7A, 8A moves downward to disengage the first and second taper holes 5A and 6A, and moves the lower end surface of the second taper sleeve 7A to the same position as the lower end of the pin body 2A. The positioning pin 1A is disengaged (initial state).

Next, the effect of the positioning pin 1A will be described.
The lower half of the pin body 2A is elastically deformed in the direction of expanding the outer diameter, and is closely engaged with the inner surface of the pin hole H2, and the upper half of the pin body 2A is elastically deformed in the direction of increasing the outer diameter, Since it can be brought into close contact with the inner surface of the pin hole H1, the same effects as those of the positioning pin 1 of the first embodiment are basically obtained.

  Further, the first and second taper holes H1 and H2 are formed as taper holes having a diameter increasing toward the distal end portion in the length direction of the pin body 2A, and the second screw shaft is formed on the third shaft portion 35 of the bolt member 9A. The portion 24 is formed, the fourth shaft portion is formed in the first screw shaft portion 23A, and the second and first screw shaft portions 24, 23A are screwed into the first and second taper sleeves 7A, 8A. When the member 9A is rotated to the tightening side, the first and second taper sleeves 7A and 8A move to the smaller diameter side of the first and second taper holes 5A and 6A and engage in close contact, and the pin body 2A The upper half and the lower half are elastically deformed toward the outer diameter expansion side, and are engaged in close contact with the two pin holes H1 and H2. When the bolt member 9A is loosened, the first and second taper sleeves 7A and 8A move in the opposite direction, and the pin body 2A is elastically deformed toward the outer diameter reducing side.

When the bolt member 9A is driven to the tightening side, the plurality of disc springs 38 are bolt members until the first and second taper sleeves 7A and 8A are engaged in close contact with the first and second taper holes 5A and 6A. When the movement of 9A is restricted and the bolt member 9A is loosened, the bolt member 9A is biased by the plurality of disc springs 38 and received by the second stop ring 16A, and the first and second taper sleeves 7A and 8A are loosened. It is driven to move smoothly in the direction.
When tightening the bolt member 9A, the second taper sleeve 8A can be brought into close contact with the second taper hole 6A, and then the first taper sleeve 7A can be brought into close contact with the first taper hole 5A.

Next, a modified example in which the above embodiment is partially modified will be described.
[1] In the first embodiment, the first taper sleeve 7 is engaged with the first taper hole 5 after the second taper sleeve 8 is engaged with the second taper hole 6. It is not necessary to limit to this order, You may comprise so that it may engage in said reverse order or simultaneously.

[2] In the second embodiment, after the second taper sleeve 8A is engaged with the second taper hole 6A, the first taper sleeve 7A is engaged with the first taper hole 5A. It is not necessary to limit to this order, You may comprise so that it may engage in said reverse order or simultaneously.

[3] In the first embodiment, the second shaft portion of the bolt member is configured to have a smaller diameter than the first shaft portion. However, the first shaft portion and the second shaft portion have the same diameter. You may comprise.
[4] In the second embodiment, the fourth shaft portion of the bolt member is configured to have a smaller diameter than the third shaft portion. However, it is not necessary to limit the diameter to a small diameter, and the third and fourth shaft portions have the same diameter. You may comprise.
[5] In addition, those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention provides a positioning pin for positioning two members, and can be used as a positioning pin for various applications employed in various mechanical devices, jigs and tools.

1, 1A Positioning pin 2, 2A Pin body 5, 5A First taper hole 6, 6A Second taper hole 7, 7A First taper sleeve 8, 8A Second taper sleeve 9, 9A Bolt member 16 First stop ring 17 First 2 stop ring 19 first rotation restricting pin 20, 20A head 21 first shaft portion 22 second shaft portion 23, 23A first screw shaft portion 24 second screw shaft portion 25 stop ring mechanism 32 second rotation restricting pin 33 first 3 rotation restricting pin 35 3rd shaft part 36 4th shaft part

Claims (6)

In a positioning pin that is inserted into two pin holes formed in two members and communicated in series and positions the pin holes so as to be coaxial.
A pin body that is elastically deformable toward the outer diameter expansion side;
First and second tapered holes formed in series so as to correspond to two pin holes in the pin body and having an inner surface tapered,
First and second tapered sleeves respectively engaged with the first and second tapered holes;
It has a first screw shaft portion inserted into the first and second tapered sleeves and screwed into at least one tapered sleeve, and the outer diameter of the pin body can be enlarged via the first and second tapered sleeves. A bolt member,
A positioning pin comprising: Each of the first and second tapered holes is formed in a tapered hole that decreases in diameter toward the intermediate portion in the length direction of the pin body or the vicinity thereof,
The bolt member includes a head, a first shaft extending from the head, and a second shaft extending integrally from the tip of the first shaft to the opposite side of the head. The positioning pin according to claim 1, wherein two shaft portions are formed on the first screw shaft portion. The first and second shaft portions are fitted into the first and second tapered sleeves,
The first taper sleeve is regulated so as not to move in the axial direction with respect to the first shaft portion by a head portion of the bolt member and a stop ring mechanism attached to the bolt member.
The pin body is provided with a first stop ring capable of receiving an outer peripheral portion of an outer surface of a head portion of the bolt member, and a first rotation restriction pin for restricting rotation of the second taper sleeve. 2. The positioning pin according to 2. The first and second taper holes are formed in a taper hole that increases in diameter toward the tip in the length direction of the pin body,
The bolt member has a head, a third shaft extending from the head, and a fourth shaft extending integrally from the tip of the third shaft to the opposite side of the head. The positioning pin according to claim 1, wherein four shaft portions are formed in the first screw shaft portion, and a second screw shaft portion screwed into the first taper sleeve is formed in the third shaft portion. The third and fourth shaft portions are respectively inserted into the first and second tapered sleeves,
The third shaft portion is externally provided with a plurality of disc springs that receive the head of the bolt member with respect to the pin body,
The pin body is provided with a second stop ring capable of receiving the outer peripheral portion of the outer surface of the head of the bolt member, and second and third rotation restricting pins for restricting the rotation of the first and second tapered sleeves, respectively. The positioning pin according to claim 4. An inclination angle of the second taper hole is set larger than an inclination angle of the first taper hole;
The positioning pin according to claim 5, wherein a pitch of the screw of the second screw shaft portion is set larger than a pitch of the screw of the first screw shaft portion.