JP2018185025A - chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain capable of easily and firmly caulking a caulking portion of at least one of a bush and a pin.SOLUTION: A chain 11 includes a pair of inner link plates 12, a cylindrical bush 18 of which both end portions are respectively fitted to first holes 16 formed on the pair of inner link plates 12, a pin 23 rotatably inserted to the bush 18, and a pair of outer link plates 14 disposed in a state of holding the pair of inner link plates 12 from an outer side, and having second holes 24 to which both end portions of the pin 23 are respectively fitted. Both end portions of at least one of the bush 18 and the pin 23 are provided with caulking portions 19, 26 caulked to the fitted one of the first hole 16 and the second hole 24. The caulking portions 19, 26 include annular wall portions 20, 27 elastically deformed in caulking, and notched grooves 21, 28 formed on the wall portions 20, 27 to form the wall portions 20, 27 into the non-annular shape.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a chain.

  Conventionally, as a chain, both ends of a bush on which a roller is rotatably fitted are fitted into a pair of bush holes respectively formed on a pair of inner link plates, and both ends of a pin rotatably inserted into the bush are The thing fitted by a pair of pin hole each formed in a pair of outer link plate is known (for example, refer patent document 1). In such a chain, the annular thin portions protruding outside the pair of inner link plates in the bush are caulked at four locations so as to be equally spaced in the circumferential direction.

JP 2009-36274 A

  By the way, in the chain as described above, since the annular thin portion of the bush is only partially caulked, there remains room for improvement in firmly caulking the annular thin portion. In addition, when caulking the annular thin portion of the bush, care must be taken not to cause a break in the annular thin portion, and thus there is a problem that the annular thin portion cannot be easily caulked. Such a problem exists not only in the bush but also in the pin.

  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 chain capable of easily and firmly caulking at least one of a bush and a pin.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
The chain that solves the above-described problem is a pair of inner link plates that are arranged so as to face each other apart from each other, and a cylindrical shape in which both ends are fitted in first holes formed in the pair of inner link plates. A pair of outer links having a bush, a pin that is rotatably inserted into the bush, and a second hole that is disposed so as to sandwich the pair of inner link plates from the outside and into which both ends of the pin are fitted. A chain having a plate, and at both ends of at least one of the bush and the pin, a caulking portion that is caulked to a fitted one of the first hole and the second hole. The caulking portion is provided with an annular wall portion that is plastically deformed when caulked, and a notch groove formed so as to make the wall portion non-annular with respect to the wall portion.

  According to this structure, since the notch groove is formed so that the wall portion is non-annular with respect to the annular wall portion, the entire wall portion can be smoothly plastically deformed when the caulking portion is caulked. . For this reason, the caulking part of at least one of the bush and the pin can be caulked easily and firmly.

In the chain, it is preferable that a plurality of the notch grooves are formed in the wall portion.
According to this configuration, when the caulking portion is caulked, the entire wall portion can be plastically deformed more smoothly.

In the chain, the plurality of cutout grooves are preferably formed at equal intervals in the circumferential direction of the wall portion.
According to this configuration, when the caulking portion is caulked, the entire wall portion can be uniformly plastically deformed. For this reason, the caulking portion can be caulked stably in a balanced manner.

  In the chain, at least one of the first hole and the second hole where the caulking portion is caulked is chamfered, and the length of the notch groove is equal to or less than the length of the chamfer. Is preferred.

  According to this configuration, when the caulking portion is caulked to at least one of the first hole and the second hole, the wall portion is plastically deformed and comes into contact with the chamfered portion. At this time, since the length of the notch groove for smoothly plastically deforming the wall portion is equal to or shorter than the chamfered length, the notch groove does not reach the portion where the wall portion of the caulking portion is not plastically deformed. Therefore, it can suppress that a notch groove is formed wastefully.

In the chain, it is preferable that the caulking portion is accommodated in at least one of the first hole and the second hole.
According to this configuration, the caulking portion does not protrude from the inner link plate or the outer link plate, which can contribute to the reduction in the size of the chain.

  According to the present invention, the caulking portion of at least one of the bush and the pin can be easily and firmly caulked.

The partially broken top view which shows a part of chain of embodiment. The principal part expanded sectional view of FIG. The perspective view of FIG. Sectional drawing which shows the state before crimping a bush to the 1st hole. The perspective view which shows the state before crimping a bush to the 1st hole. Sectional drawing which shows a state when a bush is crimped to the 1st hole. Sectional drawing which shows the state after crimping a bush to the 1st hole. The perspective view which shows the state after crimping a bush to the 1st hole. Sectional drawing which shows the state before crimping a pin to the 2nd hole. The perspective view which shows the state before crimping a pin to the 2nd hole. Sectional drawing which shows a state when a pin is crimped to the 2nd hole. Sectional drawing which shows the state after crimping the pin to the 2nd hole. The perspective view which shows the state after crimping the pin to the 2nd hole.

Hereinafter, an embodiment of a chain will be described with reference to the drawings.
As shown in FIG. 1, the chain 11 is made of, for example, a steel material, and includes a plurality of inner links 13 each having a pair of inner link plates 12 disposed so as to face each other in the width direction Y. And a plurality of outer links 15 each having a pair of outer link plates 14 arranged so as to sandwich the inner link 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 and FIG. 3, circular first holes 16 are penetrated in the width direction Y which is also the thickness direction of the inner link plate 12 at both ends in the longitudinal direction X of the inner link plate 12. Is formed. An annular first inclined surface 17 is formed at the outer end in the width direction Y of the first hole 16 of the inner link plate 12 by chamfering (for example, C chamfering).

  Two cylindrical bushes 18 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 18 are fitted in the first holes 16 of the pair of inner link plates 12 so as not to rotate. At both ends of the bush 18, first caulking portions 19 as an example of caulking portions that are caulked with respect to the first holes 16 of the pair of inner link plates 12 are provided.

  Both ends of the bush 18 are caulked in the first holes 16 at the first caulking portions 19, respectively. The first caulking portion 19 includes a first wall portion 20 as an example of an annular wall portion, and a plurality of (this embodiment) formed such that the first wall portion 20 is non-annular with respect to the first wall portion 20. The first notch groove 21 as an example of four notch grooves is provided. The four first cutout grooves 21 are formed at equal intervals in the circumferential direction of the first wall portion 20. In this case, the number of the first notch grooves 21 formed in the first wall portion 20 may be arbitrarily changed as long as it is one or more, but it is preferably four or more and an even number.

  When the first caulking portion 19 is caulked in the first hole 16, the first caulking portion 19 is plastically deformed so that the first wall portion 20 opens outward in the radial direction and contacts the first inclined surface 17. In this case, the front end surface of the first wall portion 20 is substantially flush with the outer surface of the inner link plate 12 so that the first caulking portion 19 is accommodated in the first hole 16. The bush 18 is inserted into a cylindrical roller 22 so as to rotatably support the roller 22. That is, the bush 18 is loosely fitted to the roller 22.

  At both ends in the longitudinal direction X of the outer link plate 14, circular second holes 24 into which substantially cylindrical pins 23 that are rotatably inserted into the bushes 18 are respectively inserted are both in the thickness direction of the outer link plate 14. It is formed so as to penetrate in the width direction Y. An annular second inclined surface 25 is formed by chamfering (for example, C chamfering) at the outer end in the width direction Y of the second hole 24 of the outer link plate 14.

  Both ends of the pin 23 are fitted in the second holes 24 of the pair of outer link plates 14 so as not to rotate. At both ends of the pin 23, second caulking portions 26 as examples of caulking portions that are caulked with respect to the second holes 24 of the pair of outer link plates 14 are provided. Both end portions of the pin 23 are caulked in the second holes 24 at the second caulking portions 26, respectively.

  The second caulking portion 26 includes a second wall portion 27 as an example of an annular wall portion, and a plurality of (this embodiment) formed so that the second wall portion 27 is non-annular with respect to the second wall portion 27. The second notch groove 28 as an example of four notch grooves is provided. The four second cutout grooves 28 are formed at equal intervals in the circumferential direction of the second wall portion 27. In this case, the number of the second notch grooves 28 formed in the second wall 27 may be arbitrarily changed as long as it is one or more, but it is preferably four or more and an even number.

  When the second caulking portion 26 is caulked in the second hole 24, the second caulking portion 26 is plastically deformed so that the second wall portion 27 opens outward in the radial direction and contacts the second inclined surface 25. In this case, the tip end surface of the second wall portion 27 is substantially flush with the outer surface of the outer link plate 14 so that the second caulking portion 19 is accommodated in the second hole 24.

  The pair of outer link plates 14 is rotatable with respect to the pair of inner link plates 12 via the pins 23 and the bushes 18 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 to In this case, the pin 23 is inserted into the bush 18 assembled between the pair of inner link plates 12 of the inner link 13 so that the intermediate portion other than the both ends can be rotated, and the pair of ends 23 of the outer link 15 are both ends. The outer link plate 14 is non-rotatably fitted to the second hole 24.

  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 are rotatable at the ends in the longitudinal direction X via the pins 23 and the bushes 18. It is connected to.

Next, an operation when the bush 18 is caulked in the first hole 16 of the inner link plate 12 will be described.
When the bush 18 is caulked in the first hole 16 of the inner link plate 12, first, as shown in FIGS. 4 and 5, the end of the bush 18 is placed before the first wall portion 20 is plastically deformed. The first caulking portion 19 in the state is fitted into the first hole 16 so as to correspond to the first inclined surface 17. Subsequently, as shown in FIG. 6, the pressing member 30 is pressed in a state where a part of the tip portion of the pressing member 30 having the tip portion formed in a truncated cone shape is inserted inside the first wall portion 20. It is pushed gradually toward the bush 18 by a not shown).

  Then, since the first wall portion 20 is divided into four at equal intervals in the circumferential direction by the four first cutout grooves 21, when the pressing force from the pressing member 30 is received, the first wall portion 20 smoothly moves outward in the radial direction. It is plastically deformed so that it falls evenly and spreads. At this time, since the contact state between the pressing member 30 and the first wall portion 20 changes from line contact to surface contact, the load from the pressing member 30 acts uniformly on the first wall portion 20. For this reason, the first wall portion 20 divided into four parts is uniformly pressed against the first inclined surface 17. As a result, the first caulking portion 19 of the bush 18 is caulked in the first hole 16 of the inner link plate 12.

  At this time, the first caulking portion 19 is accommodated in the first hole 16. In this case, the front end surface of the first wall portion 20 of the first caulking portion 19 is flush with the outer surface of the inner link plate 12 in the width direction Y, but the outer surface of the inner link plate 12 in the width direction Y. It may be arranged inside the width direction Y.

  Thereafter, as shown in FIGS. 7 and 8, the operation of caulking the first caulking portion 19 of the bush 18 to the first hole 16 of the inner link plate 12 is completed by separating the pressing member 30 from the first caulking portion 19. To do. At this time, the length A of each first notch groove 21 of the first caulking portion 19 is the same as the length B of the first slope 17, but may be shorter than the length B of the first slope 17. . That is, it is preferable that the length A of each first notch groove 21 of the first caulking portion 19 is equal to or shorter than the length B of the first inclined surface 17 (the chamfering length B of the first hole 16).

  As described above, the four first cutout grooves 21 are formed in the annular first wall portion 20 of the bushing 18 at equal intervals in the circumferential direction so that the first wall portion 20 is non-annular. When the caulking portion 19 is caulked in the first hole 16 of the inner link plate 12, the entire first wall portion 20 can be smoothly and uniformly plastically deformed. For this reason, the first caulking portion 19 of the bush 18 can be easily and firmly caulked with respect to the first hole 16.

Next, an operation when the pin 23 is caulked in the second hole 24 of the outer link plate 14 will be described.
When caulking the pin 23 into the second hole 24 of the outer link plate 14, as shown in FIGS. 9 and 10, first, the end of the pin 23 is placed before the second wall 27 is plastically deformed. The second caulking portion 26 in the state is fitted into the second hole 24 so as to correspond to the second inclined surface 25. Subsequently, as shown in FIG. 11, the pressing member 30 is pressed in a state where a part of the distal end portion of the pressing member 30 having the distal end portion formed in a truncated cone shape is inserted inside the second wall portion 27 ( It is gradually pushed toward the pin 23 by a not shown).

  Then, since the second wall portion 27 is divided into four at equal intervals in the circumferential direction by the four second cutout grooves 28, when the pressing force from the pressing member 30 is received, the second wall portion 27 smoothly moves outward in the radial direction. It is plastically deformed so that it falls evenly and spreads. At this time, since the contact state between the pressing member 30 and the second wall portion 27 changes from line contact to surface contact, the load from the pressing member 30 acts uniformly on the second wall portion 27. For this reason, the second wall portion 27 divided into four parts is uniformly pressed against the second inclined surface 25. As a result, the second caulking portion 26 of the pin 23 is caulked in the second hole 24 of the outer link plate 14.

  At this time, the second caulking portion 26 is accommodated in the second hole 24. In this case, the front end surface of the second wall portion 27 of the second caulking portion 26 is flush with the outer surface of the outer link plate 14 in the width direction Y, but the outer surface of the outer link plate 14 in the width direction Y. It may be arranged inside the width direction Y.

  Thereafter, as shown in FIGS. 12 and 13, the operation of caulking the second caulking portion 26 of the pin 23 to the second hole 24 of the outer link plate 14 is completed by separating the pressing member 30 from the second caulking portion 26. To do. At this time, the length C of each second notch groove 28 of the second caulking portion 26 is the same as the length D of the second slope 25, but may be shorter than the length D of the second slope 25. . That is, the length C of each second notch groove 28 of the second caulking portion 26 is preferably equal to or shorter than the length D of the second inclined surface 25 (less than the chamfering length D of the second hole 24).

  As described above, the four second cutout grooves 28 are formed in the annular second wall portion 27 of the pin 23 at equal intervals in the circumferential direction so that the second wall portion 27 is non-annular. When the caulking portion 26 is caulked in the second hole 24 of the outer link plate 14, the entire second wall portion 27 can be smoothly and uniformly plastically deformed. For this reason, the second caulking portion 26 of the pin 23 can be easily and firmly caulked with respect to the second hole 24.

According to the embodiment detailed above, the following effects are exhibited.
(1) In the chain 11, the first caulking portion 19 that is caulked in the first hole 16 is provided at both ends of the bush 18, and the first caulking portion 19 is an annular first that is plastically deformed when caulking. A wall 20 and a first cutout groove 21 formed so as to make the first wall 20 non-annular with respect to the first wall 20 are provided. For this reason, when the first caulking portion 19 is caulked in the first hole 16, the entire first wall portion 20 can be smoothly plastically deformed. Therefore, the first caulking portion 19 of the bush 18 can be easily and firmly caulked with respect to the first hole 16.

  Further, in the chain 11, a second caulking portion 26 that is caulked in the second hole 24 is provided at both ends of the pin 23, and the second caulking portion 26 is an annular second wall that is plastically deformed when caulking. And a second notch groove 28 formed so that the second wall 27 is non-annular with respect to the second wall 27. For this reason, when caulking the second caulking portion 26 to the second hole 24, the entire second wall portion 27 can be smoothly plastically deformed. Therefore, the second caulking portion 26 of the pin 23 can be easily and firmly caulked with respect to the second hole 24.

  (2) In the chain 11, a plurality of first notch grooves 21 are formed in the first wall portion 20. Therefore, when the first caulking portion 19 is caulked in the first hole 16, the entire first wall portion 20 can be plastically deformed more smoothly.

  In the chain 11, a plurality of second notch grooves 28 are formed in the second wall portion 27. For this reason, when the second caulking portion 26 is caulked in the second hole 24, the entire second wall portion 27 can be plastically deformed more smoothly.

  (3) In the chain 11, a plurality (four in this embodiment) of first cutout grooves 21 are formed at equal intervals in the circumferential direction of the first wall portion 20. For this reason, when the first caulking portion 19 is caulked in the first hole 16, the entire first wall portion 20 can be uniformly plastically deformed. Therefore, the first caulking portion 19 can be caulked with a good balance with respect to the first hole 16.

  In the chain 11, a plurality (four in this embodiment) of second cutout grooves 28 are formed at equal intervals in the circumferential direction of the second wall portion 27. For this reason, when the second caulking portion 26 is caulked to the second hole 24, the entire second wall portion 27 can be uniformly plastically deformed. Therefore, the second caulking portion 26 can be caulked in a balanced manner with respect to the second hole 24.

  (4) In the chain 11, the first hole 16 is chamfered, and the length A of the first notch groove 21 is the length of the first inclined surface 17 (the length of the chamfer of the first hole 19) B. Is the same. For this reason, when the first caulking portion 19 is caulked in the first hole 16, the first wall portion 20 is plastically deformed and comes into contact with the first inclined surface 17. At this time, since the length A of the first notch groove 21 for smoothly plastically deforming the first wall portion 20 is the same as the length B of the first inclined surface 17, the first wall portion in the first caulking portion 19 is used. The first notch groove 21 does not reach the portion where 20 is not plastically deformed. Therefore, it can suppress that the 1st notch groove 21 is formed wastefully. In addition, since the first hole 16 is chamfered, the first wall portion 20 that is plastically deformed can be guided and accommodated in the space formed by the chamfering.

  In the chain 11, the second hole 24 is chamfered, and the length C of the second notch groove 28 is equal to the length of the second inclined surface 25 (the chamfer length of the second hole 24) D. It is the same. For this reason, when the second caulking portion 26 is caulked in the second hole 24, the second wall portion 27 is plastically deformed and comes into contact with the second inclined surface 25. At this time, since the length C of the second notch groove 28 for smoothly plastically deforming the second wall portion 27 is the same as the length D of the second inclined surface 25, the second wall portion in the second caulking portion 26 is used. The second notch groove 28 does not reach the portion where 27 is not plastically deformed. Therefore, it can suppress that the 2nd notch groove 28 is formed wastefully. In addition, since the second hole 24 is chamfered, the second wall 27 that is plastically deformed can be guided and accommodated in the space formed by the chamfering.

  (5) In the chain 11, the first caulking portion 19 is received in the first hole 16. For this reason, since the 1st crimping part 19 does not protrude outside the width direction Y in the inner link plate 12, it can contribute to size reduction of the chain 11. FIG.

  In the chain 11, the second caulking portion 26 is accommodated in the second hole 24. For this reason, since the 2nd crimping part 26 does not protrude outside the width direction Y in the outer link plate 14, it can contribute to size reduction of the chain 11. FIG.

(Example of change)
In addition, you may change the said embodiment as follows.
The first caulking portion 19 does not necessarily need to be accommodated in the first hole 16. That is, the first caulking portion 19 may protrude from the first hole 16.

-The 2nd crimp part 26 does not necessarily need to be settled in the 2nd hole 24. FIG. That is, the second caulking portion 26 may protrude from the second hole 24.
-It is not always necessary to chamfer the first hole 16. That is, the first slope 17 in the first hole 16 may be omitted.

The length A of the first cutout groove 21 may be longer than the length of the first inclined surface 17 (the chamfered length of the first hole 19) B.
-It is not necessary to chamfer the second hole 24. That is, the second slope 25 in the second hole 24 may be omitted.

The length C of the second notch groove 28 may be longer than the length D of the second inclined surface 25 (the chamfer length of the second hole 24) D.
The plurality of (four in the present embodiment) first cutout grooves 21 do not necessarily have to be formed at equal intervals in the circumferential direction of the first wall portion 20.

The plurality (four in this embodiment) of the second notch grooves 28 do not necessarily have to be formed at equal intervals in the circumferential direction of the second wall portion 27.
-Either the 1st crimping part 19 provided in the both ends of the bush 18, and the 2nd crimping part 26 provided in the both ends of the pin 23 may be abbreviate | omitted.

-You may make the solid pin 23 hollow.
The roller 22 may be omitted.

  DESCRIPTION OF SYMBOLS 11 ... Chain, 12 ... Inner link plate, 14 ... Outer link plate, 16 ... 1st hole, 18 ... Bush, 19 ... 1st crimping part as an example of a crimping part, 20 ... 1st wall as an example of a wall part , 21... First notch groove as an example of a notch groove, 23... Pin, 24... Second hole, 26... Second caulking part as an example of caulking part, 27. 28 ... A second notch groove as an example of the notch groove.

Claims (5)

A pair of inner link plates arranged to face each other apart from each other;
A cylindrical bushing having both ends fitted in first holes formed in the pair of inner link plates;
A pin rotatably inserted into the bush;
A pair of outer link plates arranged to sandwich the pair of inner link plates from the outside and having second holes into which both ends of the pins are respectively fitted;
A chain with
At both ends of at least one of the bush and the pin, a caulking portion is provided that is caulked in the fitted direction of the first hole and the second hole,
The caulking portion includes an annular wall portion that is plastically deformed when caulked, and a notch groove formed so as to make the wall portion non-annular with respect to the wall portion. chain.   The chain according to claim 1, wherein a plurality of the notch grooves are formed in the wall portion.   The chain according to claim 2, wherein the plurality of cutout grooves are formed at equal intervals in a circumferential direction of the wall portion. At least one of the first hole and the second hole where the caulking portion is caulked is chamfered,
The chain according to any one of claims 1 to 3, wherein a length of the notch groove is equal to or less than a length of the chamfer.   The chain according to claim 4, wherein the caulking portion is accommodated in at least one of the first hole and the second hole that is caulked.