JP6816571B2 - Pins and chains - Google Patents

Description

The present invention relates to pins and chains with pins.

Conventionally, both ends of a cylindrical bush are press-fitted into the bush press-fit holes of a pair of inner plates, and both ends of a cylindrical pin inserted into the bush are press-fitted into the pin press-fit holes of a pair of outer plates. A chain having an external link formed by press fitting is known (see, for example, Patent Document 1). In such a chain, the outwardly projecting portions of the pair of outer plates of the cylindrical pins are crimped by a press via a caulking jig. By doing so, the cylindrical pin is prevented from coming out of the pin press-fit hole of the pair of outer plates or rotating with respect to the pin press-fit hole.

Further, in some chains as described above, the base end portion of the pin is crimped 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 crimping the base end of the pin to the outer plate, the tip of the pin is passed through the hole of the flight (part), and in that state, the nut (part) is tightened to the screw part to pin the pin. The flight is attached to the tip of the.

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

By the way, in a chain as described in Patent Document 2, an axial force is usually applied to the proximal end side of the pin when the proximal end side of the pin is crimped to the outer plate, so that this force is received. The tip side of the pin is supported by a jig or the like so that the pin can be used. For this reason, an axial compressive force acts on the pin, and this compressive force may deform the screw portion (nut mounting portion) and the flight mounting portion.

The present invention has focused on such problems existing in the prior art. An object of the present invention is to provide a pin and a chain capable of suppressing deformation of the mounting portion when an axial compressive force acts on the pin.

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

According to this configuration, the axial compressive force applied to the pin when the first end portion is crimped can be absorbed by the absorbing portion, so that the compressive force acting on the mounting portion can be reduced. Therefore, it is possible to prevent the mounting portion from being deformed when an axial compressive force acts on the pin.

In the pin, the cross-sectional area of the absorbing portion orthogonal to the axial direction is preferably smaller than the cross-sectional area of the mounting portion orthogonal to the axial direction.
According to this configuration, the rigidity of the absorbing portion is lower than the rigidity of the mounting portion, so that 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 being plastically deformed by receiving the compressive force, and the cross-sectional area orthogonal 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 configuration, when the component is attached to the attachment portion, it is possible to prevent the absorption portion after plastic deformation from becoming an obstacle.
In the pin, a recess is formed on the tip surface of the first end 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 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 notched 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 is applied from the compressive force applying member to the concave portion, the peripheral wall of the concave portion is deformed so as to evenly fall outward in the radial direction, so that the first end portion is formed as a link. It can be suitably crimped to the through hole.

A chain that solves the above problems is provided with pins having the above configuration.
According to this configuration, it is possible to obtain the same effect as the pin having the above configuration.

According to the present invention, it is possible to prevent the mounting portion from being deformed when an axial compressive force acts on the pin.

The plan view which shows a part of the chain of embodiment. FIG. 1 is an enlarged cross-sectional view of a main part of FIG. The side view of FIG. Side view of the connecting pin before it is incorporated into the chain. Front view of the connecting pin of FIG. A partially broken view showing a state when the first end portion of the connecting pin of FIG. 4 is inserted into the first pin insertion hole of the first outer link plate. A partially broken view showing a state when the first end portion of the connecting pin of FIG. 4 is crimped into the first pin insertion hole of the first outer link plate. Side view of FIG. FIG. 5 is a side view showing a state when the first end portion of the connecting pin of FIG. 4 is crimped into the first pin insertion hole of the first outer link plate. Top view showing a part of the chain of the modified example. Top view showing a part of the chain of another modified example.

Hereinafter, embodiments of the chain will be described with reference to the drawings.
As shown in FIG. 1, the chain 11 is composed of a plurality of inner links 13 each having a pair of inner link plates 12 which are made of steel and are arranged so as to face each other in the width direction Y and are separated from each other, and a pair of inner links. It includes 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. 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 of the inner link plate 12 in the longitudinal direction X so as to penetrate in the width direction Y, which is also the thickness direction of the inner link plate 12. There is. 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 a distance between the pair of inner link plates 12.

Both ends of the bush 17 are non-rotatably fitted to the bush insertion holes 16 of the pair of inner link plates 12. The bush 17 rotatably supports the roller 18 by being inserted into the cylindrical roller 18. That is, the bush 17 is loosely fitted to the roller 18.

At both ends of the outer link plate 14 in the longitudinal direction X, circular pin insertion holes 21 as an example of a through hole into which a connecting pin 20 as an example of a substantially cylindrical pin that can be inserted into a bush 17 is inserted are provided. 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 each other in the width direction Y, one is the first outer link plate 14a and the other is the 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 ends 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 C at the outer end of the first outer link plate 14a in the first pin insertion hole 21a in the width direction Y. The first end 22 of the connecting pin 20 is crimped 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 tip 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 in the central portion of the tip surface 22a of the first end portion 22 of the connecting pin 20. A plurality of (four in this embodiment) notch grooves 27 are formed in the peripheral wall 26 of the recess 25 so as to be evenly spaced in the circumferential direction. The peripheral wall 26 of the recess 25 is deformed so as to be evenly tilted outward in the radial direction by receiving an axial compressive force applied when the first end portion 22 of the connecting pin 20 is crimped to the first outer link plate 14a. Then, it is in contact with the slope 24 of the first pin insertion hole 21a.

As shown in FIG. 2, the second end portion 23 of the connecting pin 20 is formed with a plate mounting portion 28 as an example of a mounting portion to which the second outer link plate 14b as an example of the component is mounted. 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 on the tip end side of the second end portion 23 of the connecting pin 20. An male screw portion 30 as an example of a mounting portion to be attached by screwing a nut 29 as an example is formed.

The tip surface 23a of the second end 23 of the connecting pin 20 is provided with a columnar absorbing portion 31 capable of absorbing the compressive force in the axial direction so as to project when the connecting pin 20 is subjected to an axial compressive force. Has been done. The absorbing portion 31 is crimped by applying an axial compressive force to the connecting pin 20 in a state where the first end portion 22 of the connecting pin 20 is inserted into the first pin insertion hole 21a of the first outer link plate 14a. Upon receiving this compressive force, the tip portion 31a is plastically deformed so as to be flatly crushed, thereby absorbing this compressive force.

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

The plate mounting portion 28 of the second end portion 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 threaded portion 30 of the second end portion 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 at 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 pin 20 and the bush 17 in a state where the pair of inner link plates 12 are arranged so as to sandwich the pair of inner link plates 12 from the outside in the width direction Y. Can be freely connected. In this case, the connecting pin 20 can rotate the intermediate portion 32 other than both end portions (first end portion 22 and second end portion 23) to the bush 17 assembled between the pair of inner link plates 12 of the inner link 13. In the inserted state, both ends 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 adjacent to each other in the longitudinal direction X and the outer link plate 14 of the outer link 15 rotate between the ends of the outer link 15 via the connecting pin 20 and the bush 17. It is freely connected.

Next, the operation when assembling the chain 11 will be described.
As shown in FIGS. 4 and 5, in the unused connecting pin 20 before being incorporated into the chain 11, the peripheral wall 26 of the recess 25 at the first end 22 and the absorbing portion 31 at the second end 23 are completely deformed. Not. In the unused connecting 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 assembling the chain 11, first, the first end portion 22 of the unused connecting 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 the 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, with the jig 33 fixed, a part of the tip portion of the compressive force applying member 34 having the tip portion formed in a truncated cone shape is inserted into the recess 25 of the first end portion 22. As a result, the compressive force applying member 34 is positioned.

Subsequently, when the compressive force applying member 34 is gradually pushed toward the connecting pin 20 by a press machine (not shown), an axial compressive force is applied to the entire connecting 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. 9 deformed so as to evenly fall and spread outward in the radial direction. At this time, the tip 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 inside the first pin insertion hole 21a. It may be housed in.

The axial compressive force applied to the connecting pin 20 also acts on the plate mounting portion 28, the male screw portion 30, and the absorbing 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 tip portion 31a of the absorbing portion 31 is flattened as shown by the solid line in FIG. 7 from the state before deformation shown by the broken line in FIG. It is absorbed by changing to a deformed state. Therefore, the deformation of the plate mounting portion 28 and the male screw portion 30 due to the axial compressive force applied to the connecting pin 20 is effectively suppressed.

Subsequently, as shown in FIG. 2, the connecting pin 20 in a state where the first end portion 22 is crimped to the first outer link plate 14a is assembled to the pair of inner link plates 12 in a state where the first end portion 22 is inserted through the roller 18. Insert it into the bush 17. Subsequently, the plate mounting portion 28 of the second end portion 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 mounting portion 28 is hardly deformed by the axial compressive force 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 with the nut 29 screwed into the male threaded portion 30 of the second end portion 23 of the connecting pin 20, the second outer link plate 14b becomes the plate mounting portion 28 at the second pin insertion hole 21b. It is fixed. At this time, the male screw portion 30 is hardly deformed by the axial compressive force applied to the connecting pin 20 described above, so that the male screw portion 30 is smoothly screwed with the nut 29. Further, at this time, the maximum width of the absorbing portion 31 perpendicular to the axial direction of the plastically deformed tip portion 31a is smaller than the valley diameter of the male screw portion 30. Therefore, the plastically deformed tip portion 31a in the absorbing portion 31 does not interfere with the screwing of the nut 29 and the male screw portion 30.

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

(1) In the connecting pin 20, an absorbing portion 31 capable of absorbing an axial compressive force acting on the connecting pin 20 is provided on the tip surface 23a of the second end portion 23. Therefore, when the first end portion 22 is crimped 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 prevent the plate mounting portion 28 and the male screw portion 30 from being deformed when an axial compressive force acts on the connecting pin 20. Therefore, it is possible to prevent the plate mounting portion 28 and the male screw portion 30 from deteriorating in dimensional accuracy due to the axial compressive force acting on the connecting pin 20.

(2) In the connecting pin 20, the cross-sectional area of the absorbing portion 31 orthogonal to the axial direction is smaller than the cross-sectional area of the plate mounting portion 28 and the male screw portion 30 orthogonal to the axial direction. Therefore, the rigidity of the absorbing portion 31 is lower than the rigidity of each of the plate mounting portion 28 and the male screw portion 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 absorbing force 31 can effectively reduce the compressive force acting on the plate mounting portion 28 and the male screw portion 30.

(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 orthogonal to the axial direction after the plastic deformation is the plate mounting portion 28 and the male screw portion 30. It is smaller than each cross-sectional area perpendicular to the axial direction. Therefore, when the second outer link plate 14b and the nut 29 are attached to the plate attachment portion 28 and the male screw portion 30, it is possible to prevent the tip portion 31a of the absorption portion 31 after plastic deformation from becoming an obstacle.

(4) In the connecting pin 20, a part of the tip of the compressive force applying member 34 is inserted into the tip surface 22a of the first end portion 22 when the compressive force is applied via the compressive force applying member 34. The recess 25 to be formed is formed. Therefore, the compressive force applying member 34 can be positioned by the recess 25.

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

(Change example)
The above embodiment may be changed as follows.
As shown in FIG. 10, the recess 25 of the first end 22 of the connecting pin 20 is omitted, and the tip surface 22a of the first end 22 is deformed by a hammer or the like to deform the first end 22. 1 The outer link plate 14a may be crimped. In this case, instead of the plate mounting portion 28 and the male threaded portion 30, the second end portion 23 of the connecting pin 20 is provided with a component mounting portion 40 to which components other than the second outer link plate 14b and the nut 29 can be mounted. It may be formed as a mounting portion.

As shown in FIG. 11, 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 facing each other in the width direction Y in the chain 41. The mounting pin 46 may be crimped as a pin. The mounting pin 46 has a component mounting portion 45 to which components can be mounted. The outer diameter of the component mounting portion 45 may be larger than the outer diameter of a portion of the mounting pin 46 other than the component mounting portion 45. In the chain 41, both the mounting pin 46 and the connecting pin 43 are crimped to the outer link plate 42 by deforming the end faces by hitting with a hammer or the like.

-In the connecting pin 20, it is not always necessary to form a notch groove 27 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, and may be a polygon such as a quadrangle or a hexagon, or an ellipse.

The number of notch grooves 27 formed in the peripheral wall 26 of the recess 25 in the connecting pin 20 may be arbitrarily changed.
-In the connecting pin 20, the plurality of notch grooves 27 formed in the peripheral wall 26 of the recess 25 do not necessarily have to be formed so as to be evenly spaced in the circumferential direction.

-In the connecting pin 20, the recess 25 may be omitted.
-In the connecting pin 20, the cross-sectional area of the absorbing portion 31 orthogonal to the axial direction after plastic deformation is not necessarily smaller than the cross-sectional area of the plate mounting portion 28 and the male screw portion 30 orthogonal to the axial direction. When the cross-sectional area orthogonal to the axial direction after plastic deformation is equal to or greater than the cross-sectional area orthogonal to the axial direction of the plate mounting portion 28 and the male screw portion 30, the absorbing portion 31 has the plate mounting portion 28 and the male screw portion 30. The plastically deformed tip portion 31a is cut off before the second outer link plate 14b and the nut 29 are attached to the respective parts.

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

-In the connecting pin 20, the absorbing portion 31 may be formed in a truncated cone shape in which the outer diameter becomes smaller toward the tip. In this way, it is possible to prevent the absorbing portion 31 from buckling when an axial compressive force acts on the connecting pin 20.

11, 41 ... Chain, 14b ... Second outer link plate as an example of parts, 20 ... Connecting pin as an example of a pin, 21 ... Pin insertion hole as an example of a through hole, 22 ... First end, 23 ... 2nd end, 25 ... recess, 26 ... peripheral wall, 27 ... notch groove, 28 ... plate mounting part as an example of mounting part, 29 ... nut as an example of parts, 30 ... male threaded part as an example of mounting part, 31 ... Absorbent part, 34 ... Compressive force applying member, 40, 45 ... Parts mounting part as an example of mounting part, 44 ... Hole as an example of through hole, 46 ... Mounting pin as an example of pin.

Claims (6)

The first end, which is crimped by applying an axial compressive force while being inserted into the through hole formed in the link of the chain,
The second end where the mounting part where the parts are mounted is formed, and
With
A pin characterized in that an absorbing portion capable of absorbing the compressive force is provided at the tip end portion of the second end portion. The pin according to claim 1, wherein the cross-sectional area of the absorbing portion orthogonal to the axial direction is smaller than the cross-sectional area of the mounting portion orthogonal to the axial direction. The absorbing portion absorbs the compressive force by being plastically deformed by receiving the compressive force, and the cross-sectional area orthogonal to the axial direction after the plastic deformation is larger than the cross-sectional area orthogonal to the axial direction of the mounting portion. The pin according to claim 1 or 2, characterized in that it is small. The tip surface of the first end portion is characterized in that a recess is formed in which a part of the compressive force applying member is inserted when the compressive force is applied via the compressive force applying member. The pin according to any one of claims 1 to 3. The pin according to claim 4, wherein a plurality of notched grooves are formed on the peripheral wall of the recess so as to be equidistant in the circumferential direction. A chain comprising the pin according to any one of claims 1 to 5.

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