JP2018146063A - Pin and chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pin and a chain, capable of suppressing deformation of an attachment part in a case where axial compression force acts on the pin.SOLUTION: A connection pin 20 includes: a first end part 22 caulked by imparting axial compression force in a state of being inserted into a first pin insertion hole 21a formed in a first outer link plate 14a of a chain 11; and a second end part 23 formed with a plate attachment part 28 and male screw part 30 to which a second outer link plate 14b and a nut 29 are respectively attached. On an apical surface 23a of the second end part 23, provided is an absorption part 31 capable of absorbing compression force.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pin and a chain including the pin.

  Conventionally, both ends of cylindrical bushes are press-fitted into bushing press-fit holes of a pair of inner plates, and both ends of cylindrical pins inserted into the bushings are pin-fit holes of a pair of outer plates. A chain including an outer link configured to be press-fitted is known (see, for example, Patent Document 1). In such a chain, the portion of the cylindrical pin that protrudes outside the pair of outer plates is caulked by a press machine via a caulking jig. By doing so, the cylindrical pins are prevented from coming out of the pin press-fitting holes of the pair of outer plates or rotating with respect to the pin press-fitting holes.

  In addition, in some chains as described above, the base end portion of the pin is caulked to the outer plate, and a screw portion is formed at the tip end portion of the pin (see, for example, Patent Document 2). In such a chain, after pinning the base end of the pin to the outer plate, pass the tip of the pin through the flight (part) hole and tighten the nut (part) to the threaded part in that state. A flight is attached to the tip of the.

JP 2009-85238 A JP 2009-190850 A (FIG. 3)

  By the way, in a chain as described in Patent Document 2, normally, when the base end side of the pin is caulked to the outer plate, an axial force is applied to the base end side of the pin. The tip end side of the pin is supported by a jig or the like. For this reason, since the axial compressive force acts on the pin, there is a possibility that the screw portion (nut attaching portion) and the flight attaching portion are deformed by the compressive force.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a pin and a chain that can suppress deformation of the mounting portion when an axial compressive force acts on the pin.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
The pin that solves the above problem is formed with a first end portion that is crimped by being applied with an axial compressive force while being inserted into a through hole formed in a link of the chain, and an attachment portion to which a component is attached. A second end portion, and an absorption portion capable of absorbing the compressive force is provided at a distal end portion of the second end portion.

  According to this configuration, the compressive force acting on the mounting portion can be reduced because the compressive force in the axial direction applied to the pin when the first end is caulked can be absorbed by the absorbent portion. Therefore, it is possible to suppress the attachment portion from being deformed when an axial compressive force acts on the pin.

In the pin, it is preferable that a cross-sectional area perpendicular to the axial direction in the absorbing portion is smaller than a cross-sectional area perpendicular to the axial direction in the mounting portion.
According to this configuration, since the rigidity of the absorbing portion is lower than the rigidity of the mounting portion, the absorbing portion can be deformed before the mounting portion when an axial compressive force acts on the pin.

  In the pin, the absorbing portion absorbs the compressive force by receiving the compressive force and plastically deforms, and a cross-sectional area perpendicular to the axial direction after the plastic deformation is orthogonal to the axial direction of the mounting portion. It is preferably smaller than the cross-sectional area.

According to this structure, when attaching components to an attachment part, it can suppress that the absorption part after plastic deformation becomes an obstruction.
The said pin WHEREIN: The recessed part into which a part of said compression force provision member is inserted is formed in the front end surface of the said 1st end part when the said compression force is provided via a compression force provision member. It is preferable.

According to this configuration, the compressive force applying member can be positioned by the recess.
In the pin, it is preferable that a plurality of cutout grooves are formed at equal intervals in the circumferential direction on the peripheral wall of the recess.

  According to this configuration, when an axial compressive force acts on the recess from the compressive force applying member, the peripheral wall of the recess is deformed so as to fall evenly outward in the radial direction, so the first end is formed in the link. It can caulk suitably to the made through-hole.

The chain that solves the above problems includes the pin having the above-described configuration.
According to this structure, the same effect as the pin of the said structure can be acquired.

  ADVANTAGE OF THE INVENTION According to this invention, when an axial compressive force acts on a pin, it can suppress that an attaching part deform | transforms.

The top view which shows a part of chain of embodiment. The principal part expanded sectional view of FIG. The side view of FIG. The side view of the connecting pin before being incorporated in the chain. The front view of the connecting pin of FIG. FIG. 5 is a partially cutaway view showing a state when the first end of the connecting pin of FIG. 4 is inserted into the first pin insertion hole of the first outer link plate. FIG. 5 is a partially cutaway view showing a state when the first end of the connecting pin of FIG. 4 is caulked to the first pin insertion hole of the first outer link plate. The side view of FIG. The side view which shows a state when the 1st edge part of the connection pin of FIG. 4 is crimped to the 1st pin insertion hole of the 1st outer link plate. The top view which shows a part of chain of the example of a change. The top view which shows a part of chain of another example of a change.

Hereinafter, embodiments of the chain will be described with reference to the drawings.
As shown in FIG. 1, the chain 11 is made of a steel material, and includes a plurality of inner links 13 each having a pair of inner link plates 12 arranged to face each other in the width direction Y, and a pair of inner links. And a plurality of outer links 15 each having a pair of outer link plates 14 arranged so as to sandwich the plate 12 from the outside in the width direction Y.

  As shown in FIGS. 1 and 3, the inner link plate 12 of the inner link 13 and the outer link plate 14 of the outer link 15 have a substantially rectangular plate shape in which the chain 11 extends along the longitudinal direction X orthogonal to the width direction Y. The both ends in the longitudinal direction X are rounded. The inner link plate 12 and the outer link plate 14 facing each other in the width direction Y are arranged so as to be parallel to each other.

  As shown in FIG. 2, circular bush insertion holes 16 are formed at both ends in the longitudinal direction X of the inner link plate 12 so as to penetrate in the width direction Y which is also the thickness direction of the inner link plate 12. Yes. Two cylindrical bushes 17 are assembled between the pair of inner link plates 12 facing each other in the inner link 13 so as to maintain the distance between the pair of inner link plates 12.

  Both ends of the bush 17 are fitted into the bush insertion holes 16 of the pair of inner link plates 12 so as not to rotate. The bush 17 is inserted into a cylindrical roller 18 so as to rotatably support the roller 18. That is, the bush 17 is loosely fitted to the roller 18.

  At both ends in the longitudinal direction X of the outer link plate 14, circular pin insertion holes 21 as an example of through holes into which connection pins 20 as examples of substantially cylindrical pins that can be inserted into the bushes 17 are inserted. The outer link plate 14 is formed so as to penetrate in the width direction Y which is also the thickness direction. Of the pair of outer link plates 14 facing in the width direction Y, one is a first outer link plate 14a and the other is a second outer link plate 14b. The pin insertion hole 21 of the first outer link plate 14a is a first pin insertion hole 21a, and the pin insertion hole 21 of the second outer link plate 14b is a second pin insertion hole 21b.

  As shown in FIGS. 2 and 3, the connecting pin 20 has both end portions in the axial direction as a first end portion 22 and a second end portion 23, respectively. An annular slope 24 is formed by chamfering the outer end of the first pin insertion hole 21a of the first outer link plate 14a in the width direction Y. The first end 22 of the connecting pin 20 is caulked by applying an axial compressive force to the connecting pin 20 while being inserted into the first pin insertion hole 21a of the first outer link plate 14a.

  The front end surface 22a of the first end 22 of the connecting pin 20 is substantially flush with the outer surface of the first outer link plate 14a in the width direction Y. A circular recess 25 is formed at the center of the distal end surface 22 a of the first end 22 of the connecting pin 20. A plurality (four in this embodiment) of cutout grooves 27 are formed in the peripheral wall 26 of the recess 25 so as to be equally spaced in the circumferential direction. The peripheral wall 26 of the recess 25 is deformed so as to fall evenly outward in the radial direction under the axial compressive force applied when the first end 22 of the connecting pin 20 is caulked to the first outer link plate 14a. In contact with the inclined surface 24 of the first pin insertion hole 21a.

  As shown in FIG. 2, a plate attachment portion 28 as an example of an attachment portion to which the second outer link plate 14 b as an example of a component is attached is formed at the second end portion 23 of the connecting pin 20. A component for fixing the second outer link plate 14b attached to the plate attachment portion 28 from the outside in the width direction Y at a position adjacent to the plate attachment portion 28 at the second end portion 23 of the connecting pin 20 on the tip side. The male screw part 30 as an example of the attachment part attached by the nut 29 as an example being screwed together is formed.

  Provided on the distal end surface 23a of the second end 23 of the connecting pin 20 is a cylindrical absorbing portion 31 that can absorb the compressive force when an axial compressive force is applied to the connecting pin 20. It has been. The absorber 31 is caulked by applying an axial compressive force to the connecting pin 20 with the first end 22 of the connecting pin 20 being inserted into the first pin insertion hole 21a of the first outer link plate 14a. When this occurs, the compressive force is absorbed by plastic deformation so that the tip portion 31a is flattened in response to the compressive force.

  The cross-sectional area perpendicular to the axial direction of the portion of the absorbing portion 31 that is not plastically deformed is smaller than the cross-sectional area perpendicular to the axial direction of the male screw portion 30. That is, the outer diameter of the portion that is not plastically deformed in the absorbing portion 31 is smaller than the root diameter of the male screw portion 30. The cross-sectional area perpendicular to the axial direction after plastic deformation in the absorbing portion 31 is smaller than the cross-sectional area perpendicular to the axial direction in the male screw portion 30. That is, the maximum width orthogonal to the axial direction of the plastically deformed tip portion 31 a in the absorbing portion 31 is smaller than the valley diameter of the male screw portion 30.

  The plate mounting portion 28 at the second end 23 of the connecting pin 20 is inserted into the second pin insertion hole 21b of the second outer link plate 14b. A nut 29 is screwed into the male screw portion 30 of the second end 23 of the connecting pin 20. By tightening the nut 29, the second outer link plate 14b is fixed to the plate mounting portion 28 in the second pin insertion hole 21b.

  The pair of outer link plates 14 rotate with respect to the pair of inner link plates 12 via the connecting pins 20 and the bushes 17 in a state where the pair of inner link plates 12 are disposed so as to sandwich the pair of inner link plates 12 from the outside in the width direction Y. Connected freely. In this case, the connecting pin 20 can rotate to the bush 17 in which the intermediate portion 32 other than both end portions (the first end portion 22 and the second end portion 23) is assembled between the pair of inner link plates 12 of the inner link 13. In the inserted state, both end portions are non-rotatably joined to the pin insertion holes 21 of the pair of outer link plates 14 of the outer link 15.

  Therefore, in the chain 11, the inner link plate 12 of the inner link 13 and the outer link plate 14 of the outer link 15 that are adjacent in the longitudinal direction X rotate at the ends in the longitudinal direction X via the connecting pin 20 and the bush 17. It is connected freely.

Next, the operation when assembling the chain 11 will be described.
As shown in FIGS. 4 and 5, the unused connecting pin 20 before being incorporated into the chain 11 has the peripheral wall 26 of the recess 25 in the first end 22 and the absorbing portion 31 in the second end 23 completely deformed. Not. In the unused connection pin 20, the outer diameter of the first end portion 22 and the outer diameter of the second end portion 23 are slightly smaller than the outer diameter of the intermediate portion 32 inserted into the bush 17. The outer diameter of the intermediate portion 32 of the connecting pin 20 is slightly larger than the diameter of the pin insertion hole 21 of the outer link plate 14.

  As shown in FIG. 6, when the chain 11 is assembled, first, the first end 22 of the unused connection pin 20 is inserted into the first pin insertion hole 21a of the first outer link plate 14a. In this state, as shown in FIG. 7, the second end portion 23 of the connecting pin 20 is inserted into a bottomed cylindrical jig 33, and the tip surface of the absorbing portion 31 is brought into contact with the inner bottom surface of the jig 33. Subsequently, in a state where the jig 33 is fixed, a part of the distal end portion of the compression force applying member 34 having the distal end portion formed in a truncated cone shape is inserted into the concave portion 25 of the first end portion 22. Thereby, the compression force application member 34 is positioned.

  Subsequently, when the compression force application member 34 is gradually pressed toward the connection pin 20 by a press machine (not shown), an axial compression force is applied to the entire connection pin 20. Due to this compressive force, the peripheral wall 26 of the recess 25 changes from the state before deformation shown in FIG. 8 to the state shown in FIG. At this time, the front end surface 22a of the first end portion 22 of the connecting pin 20 is preferably flush with the outer surface of the first outer link plate 14a in the width direction Y, but is completely in the first pin insertion hole 21a. It may be accommodated in.

  The axial compressive force applied to the connecting pin 20 also acts on the plate attachment portion 28, the male screw portion 30, and the absorption portion 31 of the second end portion 23. However, most of the compressive force applied to the plate mounting portion 28 and the male screw portion 30 is plastic so that the distal end portion 31a of the absorbing portion 31 is flattened as shown by a solid line in FIG. Absorbed by changing to a deformed state. For this reason, the deformation | transformation of the plate attaching part 28 and the external thread part 30 by the axial compressive force provided to the connection pin 20 is suppressed effectively.

  Subsequently, as shown in FIG. 2, the connecting pin 20 with the first end portion 22 crimped to the first outer link plate 14 a is assembled to the pair of inner link plates 12 while being inserted into the roller 18. Insert through the bush 17. Subsequently, the plate mounting portion 28 of the second end 23 of the connecting pin 20 is inserted into the second pin insertion hole 21b of the second outer link plate 14b. At this time, since the plate attaching portion 28 is hardly deformed by the compressive force in the axial direction applied to the connecting pin 20 described above, it is smoothly inserted into the second pin insertion hole 21b.

  Subsequently, when the nut 29 is tightened in a state where the nut 29 is screwed into the male screw portion 30 of the second end portion 23 of the connecting pin 20, the second outer link plate 14b is connected to the plate mounting portion 28 in the second pin insertion hole 21b. Fixed. At this time, since the male screw portion 30 is hardly deformed by the axial compressive force applied to the connecting pin 20 described above, it is smoothly screwed with the nut 29. Furthermore, at this time, the maximum width orthogonal to the axial direction of the plastically deformed tip portion 31 a in the absorbing portion 31 is smaller than the valley diameter of the male screw portion 30. For this reason, the plastically deformed tip portion 31 a in the absorbing portion 31 does not hinder the screwing between the nut 29 and the male screw portion 30.

As described above, the chain 11 is assembled by sequentially connecting the inner links 13 and the outer links 15 in series.
According to the embodiment detailed above, the following effects are exhibited.

  (1) In the connecting pin 20, an absorption portion 31 capable of absorbing an axial compressive force acting on the connecting pin 20 is provided on the distal end surface 23 a of the second end portion 23. For this reason, when the first end portion 22 is caulked to the first outer link plate 14a, the axial compressive force applied to the connecting pin 20 can be absorbed by the absorbing portion 31, so that the plate mounting portion 28 and the male screw The compressive force acting on the portion 30 can be reduced. Therefore, it is possible to suppress deformation of the plate mounting portion 28 and the male screw portion 30 when an axial compressive force is applied to the connecting pin 20. Therefore, it can suppress that each dimensional accuracy of the plate attaching part 28 and the external thread part 30 falls with the compressive force of the axial direction which acts on the connection pin 20. FIG.

  (2) In the connecting pin 20, the cross-sectional area perpendicular to the axial direction of the absorbing portion 31 is smaller than the respective cross-sectional areas perpendicular to the axial direction of the plate attaching portion 28 and the male screw portion 30. For this reason, the rigidity of the absorption part 31 becomes lower than the rigidity of each of the plate attachment part 28 and the male screw part 30. Therefore, when an axial compressive force acts on the connecting pin 20, the absorbing portion 31 can be deformed before the plate mounting portion 28 and the male screw portion 30. Therefore, the compressive force which acts on the plate attachment part 28 and the external thread part 30 by the absorption part 31 can be reduced effectively.

  (3) In the connecting pin 20, the absorbing portion 31 receives the compressive force and plastically deforms to absorb the compressive force, and the cross-sectional area perpendicular to the axial direction after the plastic deformation has the plate attachment portion 28 and the male screw portion 30. It is smaller than each cross-sectional area orthogonal to the axial direction. For this reason, when attaching the 2nd outer link plate 14b and the nut 29 to the plate attaching part 28 and the external thread part 30, it can suppress that the front-end | tip part 31a of the absorption part 31 after plastic deformation becomes an obstruction.

  (4) In the connecting pin 20, when a compressive force is applied to the distal end surface 22 a of the first end portion 22 via the compressive force applying member 34, a part of the distal end portion of the compressive force applying member 34 is inserted. A recessed portion 25 is formed. For this reason, the compressive force applying member 34 can be positioned by the recess 25.

  (5) In the connecting pin 20, a plurality of cutout grooves 27 are formed in the circumferential wall 26 of the recess 25 so as to be equally spaced in the circumferential direction. For this reason, when an axial compressive force acts on the concave portion 25 from the compressive force applying member 34, the peripheral wall 26 of the concave portion 25 is deformed so as to fall evenly outward in the radial direction. Therefore, the first end 22 can be caulked suitably in the first pin insertion hole 21a of the first outer link plate 14a.

(Example of change)
In addition, you may change the said embodiment as follows.
As shown in FIG. 10, the concave portion 25 of the first end portion 22 in the connecting pin 20 is omitted, and the tip end surface 22a of the first end portion 22 is deformed by hitting with a hammer or the like, so that the first end portion 22 is The outer link plate 14a may be caulked. In this case, instead of the plate mounting portion 28 and the male screw portion 30, a component mounting portion 40 capable of mounting components other than the second outer link plate 14 b and the nut 29 is provided at the second end 23 of the connecting pin 20. You may form as an attaching part.

  As shown in FIG. 11, in a hole 44 as an example of a through hole formed between two connecting pins 43 arranged in the longitudinal direction X in a pair of outer link plates 42 opposed in the width direction Y in the chain 41, The mounting pin 46 may be caulked as a pin. The mounting pin 46 has a component mounting portion 45 to which a component can be mounted. The outer diameter of the component mounting portion 45 may be larger than the outer diameter of the portion other than the component mounting portion 45 in the mounting pin 46. In the chain 41, both the attachment pin 46 and the connection pin 43 are caulked to the outer link plate 42 by deforming the end surfaces by hitting with a hammer or the like.

In the connecting pin 20, the notch groove 27 is not necessarily formed in the peripheral wall 26 of the recess 25.
In the connecting pin 20, the shape of the recess 25 is not limited to a circle, but may be a polygon such as a quadrangle or a hexagon, or may be an ellipse.

-In the connection pin 20, the number of the notch grooves 27 formed in the peripheral wall 26 of the recessed part 25 may be changed arbitrarily.
In the connecting pin 20, the plurality of cutout grooves 27 formed in the peripheral wall 26 of the recess 25 do not necessarily have to be formed at equal intervals in the circumferential direction.

-In the connection pin 20, the recessed part 25 may be abbreviate | omitted.
In the connecting pin 20, the absorption portion 31 does not necessarily have a smaller cross-sectional area perpendicular to the axial direction after plastic deformation than each cross-sectional area perpendicular to the axial direction of the plate mounting portion 28 and the male screw portion 30. When the cross-sectional area orthogonal to the axial direction after plastic deformation is equal to or greater than the respective cross-sectional areas orthogonal to the axial direction of the plate mounting part 28 and the male screw part 30, the absorbing part 31 has the plate mounting part 28 and the male screw part 30. Before the second outer link plate 14b and the nut 29 are attached to each other, the plastically deformed tip portion 31a is cut off.

  In the connecting pin 20, the cross-sectional area orthogonal to the axial direction of the absorbing portion 31 before plastic deformation is not necessarily smaller than the respective cross-sectional areas orthogonal to the axial direction of the plate mounting portion 28 and the male screw portion 30. In this case, the absorption part 31 is excised after plastic deformation.

  -In the connection pin 20, you may form the absorption part 31 in the shape of a truncated cone where an outer diameter becomes small as it goes to a front-end | tip. If it does in this way, when the compressive force of the axial direction acts on the connecting pin 20, it can suppress that the absorption part 31 buckles.

  DESCRIPTION OF SYMBOLS 11, 41 ... Chain, 14b ... 2nd outer link plate as an example of components, 20 ... Connection pin as an example of a pin, 21 ... Pin insertion hole as an example of a through-hole, 22 ... 1st edge part, 23 ... Second end portion, 25 ... concave portion, 26 ... peripheral wall, 27 ... notch groove, 28 ... plate attachment portion as an example of attachment portion, 29 ... nut as an example of component, 30 ... male screw portion as an example of attachment portion, DESCRIPTION OF SYMBOLS 31 ... Absorption part, 34 ... Compressive force provision member, 40, 45 ... Component attachment part as an example of an attachment part, 44 ... Hole as an example of a through-hole, 46 ... Attachment pin as an example of a pin.

Claims (6)

A first end that is crimped by being applied with an axial compressive force in a state of being inserted into a through-hole formed in a link of the chain;
A second end formed with a mounting portion to which a component is mounted;
With
An absorption part capable of absorbing the compressive force is provided at a tip part of the second end part.   2. The pin according to claim 1, wherein a cross-sectional area perpendicular to the axial direction in the absorbing portion is smaller than a cross-sectional area perpendicular to the axial direction in the mounting portion.   The absorbing portion absorbs the compressive force by receiving the compressive force and plastically deforms, and a cross-sectional area orthogonal to the axial direction after the plastic deformation is greater than a cross-sectional area orthogonal to the axial direction of the mounting portion. The pin according to claim 1, wherein the pin is small.   A concave portion into which a part of the compressive force applying member is inserted when the compressive force is applied via the compressive force applying member is formed on the distal end surface of the first end portion. The pin according to any one of claims 1 to 3.   The pin according to claim 4, wherein a plurality of cutout grooves are formed at equal intervals in the circumferential direction on the peripheral wall of the recess.   The chain provided with the pin as described in any one of Claims 1-5.

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